Application of rapid prototyping in industrial field Essay

Application of rapid prototyping in industrial field - Essay Example Some specific applications of rapid prototyping are discussed below. 1. Investment casting Investment casting is one of the widely used manufacturing processes in recent days though it had been in use for several years. In the investment casting process, a metallic part is created with the help of an investment model and it is used as hardware. As the first step of the process, the investment is coated with some layers of ceramic shell material and sand. After drying the pattern, it is burned with high temperature in order to make it stronger and acquire high resistance to thermal reactions. This burning process creates several cavities in the pattern which is filled with molten metal and subsequently allowed to cool (Cooper & Cooper, 133)1. The model so produced allows the company to assess the performance of the designed model. Since the company gets the prototype casting within a few days on less expense, they are relieved from the huge expenses of traditional processes of product ion tooling or machining. In addition to investment casting, sand casting, vacuum casting, and injection molding there are some of the applications of rapid prototyping which fall under the category of indirect tooling. 2 2. Laser-Engineered Net Shaping It is also an application of rapid prototyping and includes in the category of direct tooling. ... The MTS Corporation has commercialized the system. Rapid tools, Direct AIM, LOMComposite, and Sand Molding are the other applications under direct tooling. 5 3. Aerospace and Military Rapid prototyping is used for the Airbus manufacturing in the Europe especially in UK. The Airbus manufacturing industry faces the challenge in designing adequate models of wind tunnel as it involves the pumping of ‘high pressure air to power turbine engines within a limited space envelope’ (Euromold)6. Laser sintering was discovered as the best solution to this problem and it helps the manufacturer to meet various financial needs of the project and meet the deadlines. Rapid prototyping and thereby additive technologies help the wind tunnel industrialists to carry out their functions easily and efficiently. Rapid prototyping has other applications also in the service area of military. 4. Medical and Dental 7 As the branch of rapid prototyping developed fast, the medical industry has also ob tained several advantages. It helps medical technicians to design physical models from medical images with help of additive fabrication technology. Nowadays, the surgeons across the world use physical anatomical models in order to develop frameworks for complex surgeries as it helps them to carry out the process more smoothly 8(ProtoCAM). As the medical device manufactures realized the scope of rapid prototyping, they have begun to take patient-specific images so as to produce large collections of databases for the further designing processes. Researchers in the area of osteology have many applications with rapid prototyping as it helps them to produce bone models and fracture healing

A study of gender inequality in different child custody cases Essay Example for Free

A study of gender inequality in different child custody cases Essay Gender inequality in child custody cases has been happening since custody hearings were created. Today, fathers are less likely to win custody of their children; resulting in court and legal fees that the mothers do not have to pay. Regardless of the parents living situation or income, if the mother is physically healthy enough to raise the child, she has a major advantage.   On top of everything else, men are more likely to owe increasing child support, even if they are hurt or arrested for non-payment. It’s inequality like this that has plagued the family courts forever, giving them a biased and bad name. Going back to times such as the 1970s, it is well noted that even then gender inequality was quite rampant. Not only is it now well-known and admitted, but many feel with the removal of ‘tender years’ law (feeling that women raised the children, this should be primary caregiver) that inequality was taken care of; this obviously not being the case.   Ã¢â‚¬Å"Indeed, typical statutory provisions at least implicitly encourage courts to consider past parental participation. Moreover, evidence that courts continue to favor mothers in custody disputes suggests that the pre-divorce caretaking function is valued.† (Elizabeth S. Scott) Not only is this seen and documented to be the same for many states; it can get even worse for small towns and municipals as their rulings have a higher chance to be biased and go unpunished and undocumented. While there are waivers to get court fees waived, many times the court rejects these fee waivers; resulting in immense costs for fathe r. If the father wants to claim custody of his child, some places may make the father file a petition for adoption (even if he is the biological father), which cost money to file. Fees for this could range from $20 to $200; something a struggling father with legal fees could usually not easily pay. With all these legal fees the father will also have to pay for any attorney fees; and for the attorney themselves. There have been many reported cases of mothers who can not support their children, being awarded custody for supposedly other reasons; while the father who could support the child is writing off as unfit. For example, there have been several cases where homeless mothers were award full custody of their children, while the father had a stable living situation. Not only living situation wise, but women who don’t have a stable source of income are often not seen as a problem in the eyes of the court. It operates under the guidance that women can get more government aid (such as welfare) for their children; often resulting in poor treatment of children due to improper nutrition and medical care. All of this is taking place due to courts going for what they feel would be the ‘best interest’ of the child, rather than the main negatives and benefits for each parent. More often than not, more care is done when a parent informs the court they want to move out of state with the child. This usually brings about a full inspection into both parents history, so to decide the right choice and not send a child out of state with an unfit parent. Operating on this backing is wrong, and this concept should be applied to every family court case regardless of circumstances or not. However, if a father was awarded custody, and wanted to move out of state to â€Å"start fresh again† or maybe â€Å"pursue love in another are†then more often than not the court would deny the father the ability to move out of state. â€Å"Where I practice, a parent wishing to move with their child out of state has to pass a two-part test. Part One: show the court a legitimate reason to move. Part Two: show the court that the move is in the best interests of the child.† (Nancy Shannon) More often than not courts find a problem with moving the child out of the mother’s state, due to incorrect thinking that all mothers are the best fit to parent their childre n; or they need to have the ability to be in contact with their children. On top of the discrimination and work required most fathers need to do in order to get custody of their child if they fail the results could end up being crippling and life ruining.   If a father is made to pay child support, right out of the court he is already in debt. Not only are the legal fees now imposed, but he now has to pay an additional monthly fee; sometimes even surpassing the cost of their monthly rent. This leads a lot of child support payers to end up not being able to pay; resulting in their arrest. What makes the entire situation worse is that once in jail their fees do not stop. The debts continue to accrue and once they get out, it could become a vicious cycle of not being able to pay, being arrested, and then being released. Yet somehow this is not the entire story of it. If you get hurt or have a medical injury making you unable to work, your payments still do not stop. You have to make a petition to the judge with proper documentation (which could be costly to print out depending on state medical information laws) and even then a judge may decide your injury is not debilitating enough. This one event in a person’s life could result in the rest of their life being ruined. â€Å"All I was saying was, ‘Give me an opportunity instead of throwing me in jail because that just puts me further behind in child support,† Ferebee says. â€Å"Let me find work so I can earn money.’† This year, Ferebee was headed to jail a fifth time for failure to pay child support.† (Tina Griego) This could turn your life into a ‘debtors prison’ where there is no hope for escape, and once the process has started each day makes recovery more and more improbable. There should be more options available to the father that cannot pay; such as working the payment off in community service or being forced to an assigned job for a certain amount of payment until the balance is resolved. This not only means fewer people in the jails for non-violent crimes but a better chance at actually paying the debt.   Unfortunately, the standard today is to just increase the debt hoping that the person could eventually afford it. One of the most compelling arguments against gender bias in court would have to be that because women usually take care of the children more often, they should be the primary caretaker. Several well-known judges had been surveyed about this, and many have told they feel this is not bias. Most judges are not getting a direct view of the household. That is why each case needs to be verified on a person-to-person basis, rather than a gender basis (i.e. look at BOTH the mother and father for the best living situation). â€Å"Her article holds that mother preference is not a gender biased opinion if the mother was the primary caretaker of the child‟s past.   She writes that bias is often seen because â€Å"fathers   are often given more credit than mothers for doing what is expected of mothers, to penalize mothers more than fathers for extramarital affairs, and to think that a mother‟s investment in her career is selfish while a father‟s is the act of a responsible provider† (Lindsay R. Estep) This quote does wonder for speaking about the current legal system regarding gender. The court official who spoke in that quote clearly demonstrates (albeit with a bit of truth in some parts) gender bias, and fails to recognize it. There are also a few things that need to be addressed regarding the quote. When the official speaks about the mother being the primary caretaker, her assumptions are wrong. If a mother was a primary caretaker of the child (i.e. father works while the mother stays at home) that does not give her any more parental rights than the father and vice versa. One of the reason’s a divorce could be happening is due to the mother’s neglect of the child while the father was away. Going with the current logic of the court official, the neglectful mother would be given the child, due to previous caretaking. The issue is that is not just an isolated problem, many places all over experience this issue, and it’s met with no resistance. The correct part of the quote is true, a mother can work while the father stays at home and vice versa. If this was the case she would not, and should not be penalized. The problem with this all is nothing is being done. Even though the mass public outrage, and people standing up against bias, places like the Supreme Court fail to do anything to prevent further discrimination. â€Å"No case so clearly prohibits consideration of sex in custody cases. It should be noted, however, that there was a potential gender issue in Palmore that received no attention from the Supreme Court. It appears that Linda began cohabiting with Clarence before they were married.† (Katherine Bartlett) This case Is well known because it enforced and helped prove the clear gender bias of sex without marriage; regardless of if the bias was on the female â€Å"Nothing more seems to have been made of this factor, either by the trial court or on review, but some courts have since noticed that mothers who cohabit outside of marriage, tend to be penalized in ways fathers who cohabit outside of marriage are not.† (Katherine Bartlett) While women face the same gender bi as in some ways, in the ways people tend to care about (who gets the child, who pays fees, etc.) is where men get overlooked in quality. This quote is important because if it’s known and documented of a clear gender bias, why hasn’t the Supreme Court stepped in and introduced better legislation and guidelines to prevent further bias? The problem is old legislation, and the refusal to make a change. A currently former Supreme Court judge Antonin Scalia was quoted as saying the constitution does not dis-allow gender bias.   While not true, a Supreme Court judge, who supposedly should be speaking for the constitution, should not help spread and promote miss-information. On top of that, he was never corrected or reprimanded.   The only consequence of that action was ‘bad press’. This quote not only helps smaller local courts continue their bias but miss-informs them that they are acting legally.   Better legislation and better education for judges need t o be passed before anything can be done. And while there are many arguments that women also face these problems (and while that may be true) the problem it’s usually the men. Women are given more chances and exceptions than the men. Several document court cases have shown that on average women are given more chances to earn money and pay it, should they be ordered to pay child support. This could either be the judge informing them of state opportunities like welfare and social security, unlike the men who usually are faced with arrest threats or an actual arrest. Another idea in the system is that the reason they are in family court is often due to the father being unfit in the first place (I.e Domestic violence, threats, abuse). This is an obvious oversight into a small population of the people.   More often than not it’s just a case of a family not working well together, and no actual abuse or crimes have taken place. On top of that, when it comes to dishing out child support, the mother will likely have t he advantage; also awarded more money â€Å"In spring 1992, about one-half (6.2 million) of the 11.5 million custodial parents were awarded child support; award rates were higher for mothers than for fathers (56 percent compared with 41 percent)† (U.S. Department of Commerce) Overall, when it comes to dealing with the family courts, men are less likely to win custody of their own children. Those who have a chance at it, are often met with extreme legal fees more so than the mother. Women are often seen as a child’s protector so in the eyes of the court they are usually seen as the fit parent right from the start. It has also been noted that men’s job status and living situation is looked into more than the women’s. This is due to the assumption that women get more government aid to assist them than men; this not being true but is still a common misconception. Inequality in the courts has been taking place ever since they have been around. The problem isn’t that they refuse to acknowledge it, the problem is it’s acknowledged and yet nothing is done about it today. Works Cited: Elizabeth S. Scott.   Pluralism, Parental Preference, and Child Custody Berkley Scholarship Law,  Ã‚   May 1992 Nancy Shannon. Custody Relocation Case Study: A Judge’s Ruling on Moving Out Of State Cordell Cordell Divorce Lawyer  Ã‚  Ã‚   May 2014 U.S. Department of Commerce. Who Receives Child Support? Economics and Statistics Administration. BUREAU OF THE CENSUS  Ã‚  Ã‚   June 1995 Tina Griego. Locking up parents for not paying child support can be a modern-day ‘debtor’s prison’  Ã‚  Ã‚   September 26, 2014 Lindsay R. Estep.   Mommy or Daddy?: Perceived Gender Bias and Court Awarded Custodial Guardianship April 27, 2011 Katherine Bartlett. Comparing race and sex discrimination in custody cases Duke Law EDU

No Child Left Behind Essay example -- Education Teaching Learning Essa

No Child Left Behind As students in a Structure & Philosophy class, one of the main components has been to introduce and familiarize us with the No Child Left Behind Act. President Bush passed this legislation on January 8, 2002. The NCLB Act was designed to ensure each and every student the right to a fair education, to give parents more options in their child’s education, and to guarantee all teachers are highly qualified. By highly qualified, the act means teachers must have at least a bachelor’s degree, have full state certification or licensure, and have demonstrated competence in their subject areas (US Dept. of Education). â€Å"Making the Grade,† which was published in the Salt Lake Tribune in September of this year, is an article arguing the negative sides of the No Child Left Behind Act. Through this article, a majority of the discussion regarded the budgeting involved with NCLB. This article calls No Child Left Behind a â€Å"one-size-fits-all formula for improving education in America† (Making the Grade). According to President Bush, the NCLB Act is â€Å"’the cornerstone’ of his administration† (Salt Lake Tribune). Like with any legislation, however, come both positive and negative sides. As argued in â€Å"Making the Grade,† the No Child Left Behind Act seeks to reduce gaps in testing areas that have allowed kids to advance without having high-quality skills in subjects such as math and reading. By discovering what kids are slipping through the gaps in testing, it will be easier for schools to aid these students and make sure they are not left behind. Other main goals of this act include to find teachers who are not well educated in the subjects they are currently teaching, and to locate those schools who fail t... ... Act highly overweigh the few negative sides of the act, such as the supposed lack of funding as pointed out in â€Å"Making the Grade.† With time and patience, I feel everyone will see the benefits of this act and will be supportive of a brighter future of education in the US. Works Cited: â€Å"Making the Grade.† Salt Lake Tribune. 14 Sept. 2003. 30 Oct. 2003. http://web.lexisnexis.com/universe/document?_m=e639f774e6d2737990eb1dcaeec86e34&_docnum=92&wchp=dGLbVlbzSkVA&_md5=66c0907fb6980f1de15959b46cf292a4 US Department of Education. Choices for Parents. 8 November 2003. http://www.ed.gov/nclb/choice/index.html?src=ov US Department of Education. No Child Left Behind. 8 November 2003. http://www.ed.gov/nclb/landing.jhtml US Department of Education. No Child Left Behind. 8 November 2003. http://www.ed.gov/nclb/accountability/ayp/testing.html

Inspire to educate Essay

Education is an avenue that enables the production of individuals who knows the proper way to live, learn and work together for the foundation of a strong community. Each and every child deserves the chance to be educated. Such learning must be the kind that involves challenges and stimulates them to achieve their maximum potential. On the Importance of Education The importance of education is quite clear. Education is the knowledge of putting one’s potentials to maximum use. One can safely say that a human being is not in the proper sense till he is educated. This importance of education is basically for two reasons. The first is that the training of a human mind is not complete without education. Education makes man a right thinker. It tells man how to think and how to make decisions. The second reason for the importance of education is that only through the attainment of education, man is enabled to receive information from the external world; to acquaint himself with past history and receive all necessary information regarding the present. Without education, man is as though in a closed room and with education he finds himself in a room with all its windows open towards the outside world (Khan, 2007). Education has an immense impact on the human society. One can safely assume that a person is not in the proper sense till he is educated. It trains the human mind to think the right decisions. In other words, man becomes rational when he is educated. It is through education that knowledge and information is received and spread throughout the world. An educated person cannot read and write and hence he is closed to all the knowledge and wisdom he can gain through books and other mediums. In other words, he is shut off from the outside world. In contrast, an educated man lives in a room with all its windows open towards the outside world. The quality of human resource of a nation is easily judged by the number of literate people living in it. This is to say that education is a must if a nation aspires to achieve growth and development and more importantly sustain it. This may well explain the fact that rich and developed nations of the world have very high literacy rate and productive human resource. In fact these nations have started imparting selective training and education programs so as to meet the new technical and business demands of the 21st century. Keeping the importance of education in mind, the US Department of Education aims to promote student achievement and preparation for global competitiveness by fostering educational excellence and ensuring equal access. It also establishes policies regarding federal financial aid for education, and distributing as well as monitoring those funds. It also continuously strives to focus national attention on key educational issues and providing equal access to education. The importance of education cannot be neglected by any nation. And in today’s world, the role of education has become even more vital. It is an absolute necessity for economic and social development of any nation (Goel, 2007). Inspiring Children to Learn At one of their forums organized by the Walden University entitled â€Å"M. S. In Education: Teaching in Linguistically and Culturally Diverse Classrooms,† the speakers addressed the issue on how to be able to inspire the children to learn, especially the ones who due to their culture are not supported by their family to succeed in their education. This is what they have to say: Set and environment where they choose to become inspired, where the students choose to make the decision. Many families who are from ethnic minorities are not people who have traditionally been successful in school. You need to initiate the phone call to the parents on a consistent basis and let them know how important they are to their children’s education. Do it in ways that are consistent and that show people you care. This is an idea that transcends culture. A mother’s love for a child transcends culture. If you can get through to the mother, that’s what transcends. You can really be proud of knowing that you have changed a life. I have never met a parent who wasn’t interested in his or her child doing well in school. Don’t think you can motivate people. You set an environment where people elect to be motivated and ultimately empowered. It’s a choice that people make and that sets them up for success. Don’t give up on anyone. Understand people’s prior knowledge of schools, where they came from. Give them a message of hope and inclusion. Don’t give up and don’t try to motivate. Set this environment, and you’ll meet with unexpected success (Walden 2006). The need for such environment has never been so great. As educators, we need to trace the path that realizes the many needs of our children. We’ve come to the realization that we cannot do it alone. We need the role of the parents as part of the team. This involvement nonetheless affirms the role of the parents as primary stakeholders in their children’s future, particularly in education. A team whose aim is to be able to provide for our children a great investment that they made be able to reach their true promise. This teamwork is headed to achieve an increased engagement in the advocacy of parents on behalf of their children’s opportunities in learning. We are after molding fully developed citizens who will do good things to their community in return. Academic achievements are only a bonus and not an end in itself. The realization of the importance of education forbids us to deny our children the ability to achieve their fullest promises. Through this light, we cannot deny our society the benefits of our children’s untapped talents. References Alrisala Organization. (2007). The Importance of Education.Retrieved December 8, 2007 from www. alrisala. org/Articles/mailing_list/importance_of_education. html. SearchWarp. com. (2007, July 6). The Importance of Education. Retrieved December 8, 2007 from http://searchwarp. com/swa230219. html. Results for America. (2007). Learn More About Education. Retrieved December 7, 2007 from http://www. resultsforamerica. org/education/learn. php. Walden University. (2006, June 6). M. S. in Education: Teaching in Linguistically and Culturally Diverse Classrooms. Retrieved December 6, 2007 from www. waldenu. edu/c/Files/DocsSOE/Q-a_Ed_DiverseClassrooms. doc.

Acountability of a weapon

This is a paper written on the importance of keeping eyes on your weapon, written by Private John Jacob smith on the twenty third of September year two thousand fourteen. When you are in possession of a weapon for training purposes, or otherwise, for example; m 4, m 4 320 combo, m 249 saw, m 240 b, or 240 c, It is important to always maintain physical or visual contact with the weapon at all times. Also you should never be more than your own arm's length in distance from your weapon at any time.In the event that you should need to use the toilet, you should mind a responsible battle buddy that you know you can trust and request for them to look over the weapon while you are using the toilet. In the event you can not find a battle buddy that is both responsible and trustworthy to watch over your weapon while you are using the toilet, you will have to bring the weapon with you in to the restroom and insure that you wash your hands before using the weapon again.When on a firing range, i f for any reason you must leave your weapon with a persons who was placed with the responsibility of looking over your or a group of people's paeans by a higher authority, first insure your weapon is placed in the safe position an also make sure that the weapon Is cleared before leaving the weapon in the care of this person. There are many ways to Insure that your weapon Is both secure and safe. Whichever method you chose to keep your weapon safe and secure Is up to you.If you fail to keep your weapon safe and secure It could result In punishment by your superior NCO or specialist. Leaving your weapon unsecured could also result In life threatening consequences. Those consequences could be perhaps a deranged older getting their hands on your weapon and using the weapon to do harm on your fellow soldiers or even civilians. This would make you solely responsible for any deaths or Injuries that the deranged soldier caused. Leaving you weapon unattended could also result In the loose of the weapon.In which case you would have to replace the weapon at full cost from your personal Income. This could leave you with short founds and could result In further loss of your own personal goods. Not only could losing your weapon effect you financially but It could also affect your chances of getting promoted In the future. The loss of your weapon could also affect your battle buddies, causing them to stay latter looking for your weapon Instead of going home to their family and loved ones.Affecting your battle puddles personal time with their families could possibly damage you relationship with your team members and In the end could brand you as a salt bag amongst your peers. In conclusion If you are not responsible with your weapon, all kinds of bad salt could happen. Accountability of a weapon By Amsterdam an also make sure that the weapon is cleared before leaving the weapon in the care of this person. There are many ways to insure that your weapon is both secure and safe. Whichever method you chose to keep your weapon safe and secure is up to you. If you fail to keep your weapon safe and secure it could result in punishment by your superior NCO or specialist. Leaving your weapon unsecured could also result in life deaths or injuries that the deranged soldier caused. Leaving you weapon unattended could also result in the loose of the weapon. In which case you would have to replace the weapon at full cost from your personal income. This could leave you with short founds and could result in further loss of your own personal goods.Not only could losing your weapon effect you financially but it could also affect your chances of getting promoted in the future. The loss of your weapon could also affect your battle buddies, causing them to stay latter looking for your weapon instead of going home to their family and loved ones. Affecting your battle buddies personal time with their families could possibly damage you relationship with your team members and in the end could brand you as a sit bag amongst your peers. In conclusion if you are not responsible with your weapon, all kinds of bad sit could happen.

Martin Luther King Essay

Martin Luther King Essay Martin Luther King Essay Martin Luther King Jr`s impact on the civil rights movement Maya Angelou Interview achievement.org/autodoc/page/ang0int-1 Poet and Historian January 22, 1997 High Point, North Carolina oDr. Angelou, you worked with Martin Luther King, Jr. at the height of the Civil Rights Movement. What was Dr. King really like, personally? oMaya Angelou: Dr. King was a human being. He had a sense of humor which was wonderful. It is very dangerous to make a person larger than life because, then, young men and women are tempted to believe, well, if he was that great, he's inaccessible, and I can never try to be that or emulate that or achieve that. The truth is, Martin Luther King was a human being with a brilliant mind, a powerful heart, and insight, and courage and also with a sense of humor. So he was accessible. I mentioned courage, and I would like to say something else about that, finding courage in the leaders and in you who will become leaders. Courage is the most important of all the virtues, because without courage you can't practice any other virtues consistently. You see? You can't be consistently kind or fair or humane or generous, not without courage, because if you do n't have it, sooner or later you will stop and say, "Eh, the threat is too much. The difficulty is too high. The challenge is too great." So I would like to say that Dr. King, while we know from all the publicity that he was brilliant, and he was powerful, and he was passionate and right, he was also a funny man, and that's nice to know. John Lewis Interview bbc.co.uk/news/world-us-canada-23845194 Transcript from January 14, 1999 MLK's Legacy with Congressman John Lewis (D-GA) Congressman_John_Lewis: Good evening. It's great to be here. npr_host: Can you tell us a bit about your first hand experience with the Civil Rights Movement? Congressman_John_Lewis: I was born in Alabama, 50 miles from Montgomery, in southeast Alabama, in a the little town of about 13,000 people just outside of Troy. When I would visit the cities of Montgomery or Birmingham, I saw the signs that said white men and white women, I saw the signs that said colored lady, colored men. In 1950 when I was 10 years old I tried to check a book out of the local library, I tried to get a library card and I was told that the library was only for white people and not people of color. It had an unbelievable impact on me. I couldn't understand it. But in 1955 when I was 15 years old I heard about Martin Luther King, Jr. and Rosa Parks. And, 3 years later I met MLK and a year later I got involved in the civil rights movement. Congressman_John_Lewis: Dr. King was one of the most inspiring human beings I ever met. He was such a warm, compassionate and loving human being. npr_host: How was Dr. King inspiring on a personal level, as much as in public? Congressman_John_Lewis: MLK Jr. taught me how to say no to segregation and I can hear him saying now ... when you straighten up your back no man can ride you. He said stand up straight and say no to racial discrimination. The Greatest Speech Ever - Robert F Kennedy Announcing The Death Of Martin Luther King April 4th, 1968 Martin Luther King was shot and killed. On that night, Robert F Kennedy, New York's senator back then, wanted to deliver the news to the people of Indianapolis, IN Local police warned him, they won't be able to provide protection if the people wold riot because he was in the heart of the African-American ghetto. He wrote his notes on his ride and started the speech without any drafts or prewritten words before his assistance would give him their proposed draft. This speech was delivered on a back of a Flatbed truck. Although all major cities had riots, Indianapolis remained calm after RFK's speech 63 days after this speech, RFK got assassinated. I reproduced the video, creating this version after adding the above mentioned details to it, so the speech can be put into context for everyone who watches

Olympic Country Codes

Olympic Country Codes Each country has its three-letter abbreviation or code that is used during The Olympic Games to represent that country. The following is a list of the 204 countries that are recognized by the  IOC (International Olympic Committee) as National Olympic Committees. An asterisk (*) indicates a territory and not an  independent country; a listing of the independent countries of the world is available. Three-Letter Olympic Country Abbreviations Afghanistan - AFGAlbania - ALBAlgeria - ALGAmerican Samoa* - ASAAndorra - ANDAngola - ANGAntigua and Barbuda - ANTArgentina - ARGArmenia - ARMAruba* - ARUAustralia - AUSAustria - AUTAzerbaijan - AZEThe Bahamas - BAHBahrain - BRNBangladesh - BANBarbados - BARBelarus - BLRBelgium - BELBelize - BIZBermuda* - BERBenin - BENBhutan - BHUBolivia - BOLBosnia and Herzegovina - BIHBotswana - BOTBrazil - BRAThe British Virgin Islands* - IVBBrunei - BRUBulgaria - BULBurkina Faso - BURBurundi - BDICambodia - CAMCameroon - CMRCanada - CANCape Verde - CPVCayman Islands* - CAYCentral African Republic - CAFChad - CHAChile - CHIChina - CHNColombia - COLComoros - COMCongo, Republic of the - CGOCongo, Democratic Republic of the - CODThe Cook Islands* - COKCosta Rica - CRCCote dIvoire - CIVCroatia - CROCuba - CUBCyprus - CYPCzech Republic - CZEDenmark - DENDjibouti - DJIDominica - DMAThe Dominican Republic - DOMEast Timor (Timor-Leste) - TLSEcuador - ECUEgypt - EGYEl Salvador - ESAEquatorial Guinea - GEQ Eritrea - ERI Estonia - ESTEthiopia - ETHFiji - FIJFinland - FINFrance - FRAGabon - GABThe Gambia - GAMGeorgia - GEOGermany - GERGhana - GHAGreece - GREGrenada - GRNGuam* - GUMGuatemala - GUAGuinea - GUIGuinea-Bissau - GBSGuyana - GUYHaiti - HAIHonduras - HONHong Kong* - HKGHungary - HUNIceland - ISLIndia - INDIndonesia - INAIran - IRIIraq - IRQIreland - IRLIsrael - ISRItaly - ITAJamaica - JAMJapan - JPNJordan - JORKazakhstan - KAZKenya - KENKiribati - KIRKorea, North (PDR of Korea) - PRKKorea, South - KORKuwait - KUWKyrgyzstan - KGZLaos - LAOLatvia - LATLebanon - LIBLesotho - LESLiberia - LBRLibya - LBALiechtenstein - LIELithuania - LTULuxembourg - LUXMacedonia - MKD (Officially: Former Yugoslav Republic of Macedonia)Madagascar - MADMalawi - MAWMalaysia - MASThe Maldives - MDVMali - MLIMalta - MLTMarshall Islands - MHLMauritania - MTNMauritius - MRIMexico - MEXFederated States of Micronesia - FSMMoldova - MDAMonaco - MONMongolia - MGLMontenegro - MNEMorocco - MARMozambique - MOZMyanmar (Burma) - MYA Namibia - NAMNauru - NRUNepal - NEPNetherlands - NEDNew Zealand - NZLNicaragua - NCANiger - NIGNigeria - NGRNorway - NOROman - OMAPakistan - PAKPalau - PLWPalestine* - PLEPanama - PANPapua New Guinea - PNGParaguay - PARPeru - PERPhilippines - PHIPoland - POLPortugal - PORPuerto Rico* - PURQatar - QATRomania - ROURussian Federation - RUSRwanda - RWASaint Kitts and Nevis - SKNSaint Lucia - LCASaint Vincent and the Grenadines - VINSamoa - SAMSan Marino - SMRSao Tome and Principe - STPSaudi Arabia - KSASenegal - SENSerbia - SRBSeychelles - SEYSierra Leone - SLESingapore - SINSlovakia - SVKSlovenia - SLOSolomon Islands - SOLSomalia - SOMSouth Africa - RSASpain - ESPSri Lanka - SRISudan - SUDSuriname - SURSwaziland - SWZSweden - SWESwitzerland - SUISyria - SYRTaiwan (Chinese Taipei) - TPETajikistan - TJKTanzania - TANThailand - THATogo - TOGTonga - TGATrinidad and Tobago - TRITunisia - TUNTurkey - TURTurkmenistan - TKMTuvalu - TUVUganda - UGAUkraine - UKRUnited Arab Emirates - UAEUnited Ki ngdom (Great Britain) - GBR United States - USAUruguay - URUUzbekistan - UZBVanuatu - VANVenezuela - VENVietnam - VIEVirgin Islands* - ISVYemen - YEMZambia - ZAMZimbabwe - ZIM Notes on the List The territory formerly known as Netherlands Antilles (AHO) was dissolved in 2010 and subsequently lost its status as an official National Olympic Committee in 2011. The Olympic Committee of Kosovo (OCK) was established in 2003 but as of this writing, remains unrecognized as a National Olympic Committee due to Serbias dispute over Kosovos independence.

The Berlin Conference to Divide Africa

The Berlin Conference to Divide Africa The Berlin Conference was described by Harm J. de Bli in Geography: Realms, Regions, and Concepts: The Berlin Conference was Africas undoing in more ways than one. The colonial powers superimposed their domains on the African continent. By the time independence returned to Africa in 1950, the realm had acquired a legacy of political fragmentation that could neither be eliminated nor made to operate satisfactorily. Purpose of the Berlin Conference In 1884, at the request of Portugal, German chancellor Otto von Bismark called together the major western powers of the world to negotiate questions and end confusion over the control of Africa. Bismark appreciated the opportunity to expand Germanys sphere of influence over Africa and hoped to force Germanys rivals to struggle with one another for territory. At the time of the conference, 80 percent of Africa remained under traditional and local control. What ultimately resulted was a hodgepodge of geometric boundaries that divided Africa into 50 irregular countries. This new map of the continent was superimposed over 1,000 indigenous cultures and regions of Africa. The new countries lacked rhyme or reason and divided coherent groups of people and merged together disparate groups who really did not get along. ThoughtCo / Adrian Mangel Countries Represented at the Berlin Conference Fourteen countries were represented by a plethora of ambassadors when the conference opened in Berlin on November 15, 1884. The countries represented at the time included Austria-Hungary, Belgium, Denmark, France, Germany, Great Britain, Italy, the Netherlands, Portugal, Russia, Spain, Sweden-Norway (unified from 1814 to 1905), Turkey, and the United States of America. Of these 14 nations, France, Germany, Great Britain, and Portugal were the major players in the conference, controlling most of colonial Africa at the time. Berlin Conference Tasks The initial task of the conference was to agree that the Congo River and Niger River mouths and basins would be considered neutral and open to trade. Despite its neutrality, part of the Congo Basin became a personal kingdom for Belgiums King Leopold II. Under his rule, over half of the regions population died. At the time of the conference, only the coastal areas of Africa were colonized by the European powers. At the Berlin Conference, the European colonial powers scrambled to gain control over the interior of the continent. The conference lasted until February 26, 1885 - a three-month period where colonial powers haggled over geometric boundaries in the interior of the continent, disregarding the cultural and linguistic boundaries already established by the indigenous African population. Following the conference, the give and take continued. By 1914, the conference participants had fully divided Africa among themselves into 50 countries. Major colonial holdings included: Great Britain desired a Cape-to-Cairo collection of colonies and almost succeeded through their control of Egypt, Sudan (Anglo-Egyptian Sudan), Uganda, Kenya (British East Africa), South Africa, and Zambia, Zimbabwe (Rhodesia), and Botswana. The British also controlled Nigeria and Ghana (Gold Coast).France took much of western Africa, from Mauritania to Chad (French West Africa), as well as Gabon and the Republic of Congo (French Equatorial Africa).Belgium and King Leopold II controlled the Democratic Republic of Congo (Belgian Congo).Portugal took Mozambique in the east and Angola in the west.Italys holdings were Somalia (Italian Somaliland) and a portion of Ethiopia.Germany took Namibia (German Southwest Africa) and Tanzania (German East Africa).Spain claimed the smallest territory, which was Equatorial Guinea (Rio Muni). Source De Bli, Harm J. Geography: Realms, Regions, and Concepts. Peter O. Muller, Jan Nijman, 16th Edition, Wiley, November 25, 2013.

Riddley Walker and Enders Game Essay Example | Topics and Well Written Essays - 1000 words

Riddley Walker and Enders Game - Essay Example Locke. A name that was so credential to the population of the United Kingdom in the latter half of the 1600's. Locke was a great man who did many things for his country. "Locke is remembered today largely as a politic philosopher. He preached the doctrine that man naturally possesses certain large rights, the chief being life, liberty, and property." (pg.278, History at an Estranged Glance, by McCracken Phil & Dover, Ben, Your Momma Books LTD., Kandahar, Afghanistan, 2001) Locke influenced not only the people of his time, but many political thinkers in the years to come. "The American Declaration of Independence, clearly reflects Locke's teachings." (pg.278, McCracken & Dover) As well as a political thinker, Locke was also a teacher, preacher, scientist, physician, and confidential secretary to many important people of that time-frame. All in all, a very important individual in history who presented many valid points. Peter Wiggins may only be a young boy, but inside his mind is a vastly complex series of thoughts and ideas, limited to few people on the earth. "There are maybe two or three thousand people in the world as smart as us, little sister. Most of them are making a living somewhere. Teaching, the poor bastards, or doing research. Precious few of them are actually in positions of power." (pg.129, Ender's Game, by Card, Orson S., Tom Doherty and Associates Inc., New York, N.Y., 1991) Peter is an extremely persuasive person, and this is a substantial characteristic of his, which comes to play when some of his valid points are discussed and debated over in the international forum. "Peter was a master of flattery, and all of his teachers bought it." (pg.124, Card) Another characteristic which helps Peter along the way is his outstanding self control. Peter doesn't let his emotions get involved in his forum writings, therefore, making it more credible to others on the net, that he is an adult, not a child. "Peter was not insane, not in the sense that he wasn't in control of himself. He was in better control of himself than anyone she (Valentine) knew. Peter could delay any desire as long as he needed to; he could conceal any emotion" (pg.125, Card) Peter is, in fact, a child genius. Demosthenes, was a Greek orator who was born in Athens in 384 BC. He was an extremely accomplished public speaker in his time, probably one of the best ever in his country of Greece. "Demosthenes was the greatest Athenian orator." (pg.701, McCracken & Dover) Demosthenes' brilliant and controversial speeches did many things good and bad. His declamations often consisted of harsh words towards Philip II of Macedon, and the Macedon people, who were at the time, invading Greece's gold mines, and blocking off their grain routes. Often in his addresses, he would try to persuade the people of Athens to make a stand against the Macedons. " Throughout the 340's, Demosthenes continued his efforts to persuade the Athenians to take a strong stand against the Macedons. He continued to stir up opposition to what he regarded as Macedonian infringement of Greek liberty" (pg.701, McCracken & Dover) Many of Demosthenes' clever speeches, such as the Philippics, have been preserved, and are still debate d over today by scholars, and modern day philosophers. Valentine Wiggins, although a young girl, has

US Economic History-Commanding Heights Essay Example | Topics and Well Written Essays - 1250 words

US Economic History-Commanding Heights - Essay Example Keynes ideas were that the economy should be controlled by the government. Later years saw the departure from Keynes ideas to the adoption of economies that did not support government regulations. Many reforms were made and globalization set in. This was around the year 1991 after the Soviet Union collapsed. The authors say that free markets prevail in comparison to the centrally planned markets. There are worries however that, globalization may be only for a short while. This will happen if measures are not taken to end inequality and if the third world countries are not given opportunities to better themselves. The UK had a lot of resources and power and thus its capital city London was the center of globalization. This was in the first period of globalization. This period occurred before the First World War (Yergin et al pg 15). The First World War however affected Britain badly leading to a high level of unemployment. As much as the UK triumphed in the Second World War, the empire had to break. The then ruler, Winston Churchill, did not like the idea of government involvement and he thus discouraged it. In the year 1945, Clement Attlee who headed the Labor Party, was elected and he encouraged government regulations so as to avoid potential economic crisis. The government of UK nationalized almost all its major industries. In addition to this, the government controlled the earnings of the employees. These wages of the employees were regulated by the government or subjected to the union rules (Kay, pg 23). This idea of government interference became a common factor in the UK in such a way that subsequent governments adopted it. The elected government officials did nothing to change this and it became part of the UK. In the 1970s, the UK saw immense strikes of the unions including other problems such as the oil shock that was experienced in the year 1973 (Yergin et al pg 16). These problems almost crumbled Britain. That

Reflective Practice (qualititiave) Essay Example | Topics and Well Written Essays - 3250 words

Reflective Practice (qualititiave) - Essay Example s responsible for the production of knowledge and/or theory, he/she was not responsible for its implementation or its practice (Green and Levin, 1998). Within the matrix of traditional research models, therefore, the researcher was neither reflector nor practitioner. The traditional research model constrained itself and limited its potentialities for the articulation of consistently practical, applicable and relevant knowledge. Delimiting the role of the researcher to collector, organiser, interpreter and disseminator of knowledge prevents researchers from reflective engagement with the topic of enquiry and, thus, detracts from the final output itself – the research. This, at least, ids the position held by a significant number of researchers (Reason, 1994; Park, 1999; Green and Levin, 1998; Reason and Bradbury, 2001; Bray et al., 2002). Having outlined the primary difference between traditional and non-traditional/reflective research, this present research shall now explore the strategies by, and through, which the researcher may integrate reflective approaches into qualitative enquiry projects. More specifically stated, following a definition and discussion of reflective research and its variant forms and strategies, the research will look into its potential contributions to a qualitative study on the social impacts of e-commerce. Reflective research represents both a reconsideration of the principles upon which traditional research is founded and, a break with it. The traditional research model, as briefly noted in the introductory paragraphs, demands separation between research and practice, between the researcher and the practitioner. Indeed, within the matrix of the research activity and the subsequent utilisation of its output, the roles of either are clearly separate. As Bray et al. (2002) note, the researcher’s role is confined to the production of findings and the practitioner’s role is the application of, and reflection upon, those

MGMT 4420 Essay Example | Topics and Well Written Essays - 750 words

MGMT 4420 - Essay Example It is good for Candlelight to upgrade the skills of the employees so that they will be able to improve their operations. I believe that it is necessary to do so because some employees will be relocated to other areas in the event that this competitor is acquired. Given such a situation, the interpersonal skills of the employees such as communication have to be improved so that they can express their ideas freely. This helps to reduce conflicts which can negatively affect their performance. I believe that the management of Candlelight, Inc should make an effort to include the ideas of talented employees when they make decisions that affect the operations of the organisation as a whole. Employees must be given the opportunity to contribute towards the decision making process so that they can feel as important to the organization. There will be more chances that their performance will improve if they have a sense of belonging to the organization. It can be noted that this strategy can promote organisational growth since their skills will be upgraded to meet the changes taking place in the business environment. On the other hand, the employees can have a common understanding of what will be expected of them in the organization. I am convinced that the human resources management have a big role to play when it comes to improving the performance of the employees. In this particular case, I would advise the leaders of Candlelight, Inc, to adopt the democratic participatory style since it gives all the employees an opportunity to contribute their ideas in the decisions made. As suggested by Carrel (376), if employees are treated as valuable assets to the organisation, they will put maximum effort in their operations which helps in improving their performance. I believe that constant development of the employees will improve their morale which is very

Manhattan (New york)'s Urban space Essay Example | Topics and Well Written Essays - 2000 words

Manhattan (New york)'s Urban space - Essay Example Manhattan is considered as a regional leader where education, entertainment, communication and health care is concerned and in addition serves a three county population of about 200,000 people in the surrounding areas. Other amenities that Manhattan can boast of are both private and public educational centres and numerous universities that cater to a mixture of diverse cultures. The famous Kansas State University which was established in 1863 was the first successful land - grant university system that was established in the United States. This famous university houses eight colleges that represent 60 different departments of various specialized subjects. Manhattan boasts of beautiful scenic public parks, and zoos like the American zoo and the Sunset zoo. It is also quite famous for various sports facilities which include stunning golf courses. In addition to these, Manhattan is well known for its exceptional trail system that is indispensable to both bikers and walkers and which is also easily accessible to disabled people. Te trail is nine miles long and circles around half of the community. Manhattan City is committed to development and progress and continues in its quest to achieve it. Its municipal planning of the city is not only progressive but works with a vision and forward thinking. Since the 1980’s, one of the most significant developments that took place was the construction of a 300,000 square foot shopping mall situated in downtown Manhattan. The past decade has seen the construction of a new airport terminal called the â€Å"Manhattan Regional Airport.† The city has also seen the construction of the Northeast Community Park and it has now undertaken a major project initiative of downtown redevelopment in order to enhance the Town center Hall north and south of Manhattan. Geographically speaking, the character of Manhattan was largely shaped by its Geographical outlay. It’s strategic location dominates the New York Harbor and hence it emerges as

Fan fiction story Essay Example | Topics and Well Written Essays - 1000 words

Fan fiction story - Essay Example Since time immemorial, it has always been the fascination of mankind to see an intelligent being from another planet. Yet, aside from rumors that extra territestrials had been caught or found, nothing was ever proven that almost all scientist abandoned the idea of finding one, except for Dr. Nogrady, the eccentric scientist of NASA. So Professor X send a signal to the goldilocks planet Gliese 581 g hoping to prove that an intelligent being exists out there. Nobody took Dr. Nogrady effort seriously dismissing that the Professor has been chasing a pipe dream of looking for something that does not exist. A wasted genius they say. But the signal was still sent into that goldilock region of the universe. Then suddenly, a response. Dr. Nogradywas ecstatic, he himself cannot believe that his transmission were returned. For the first time in the history of science, a contact was made with an intelligent creature light years away. Through the help of a team of expert of linguists, Dr. Nogrady team were able to understand the language of the alien. The creature’s name was Apex. He was a male and an astronaut from planet Gliese 581 g who just like Dr. Nogrady, has also been scouring through the stars for a possible contact with an intelligent being. ... Earth does not have the technology yet to visit Planet Gliese 581 g so it was agreed that it will be Apex’s team who would be visiting the Earth. According to Dr. Nogrady’s estimate, the aliens will be arriving on earth six months from now. Necessary preparations were made for the arrival of Apex’s party. All honors were conferred to Dr. Nogrady who rose to sudden popularity due to his recent contact with an extra terrestrial being. He also received unlimited funding from the United Nation’s for his research and was made in-charge of the receiving party since it was only Professor X who was privy in communicating with Apex’s party. The initial contact will be made in the vast desert of Sahara desert in Africa since it was anticipated that Apex’s ship will be huge since it has to travel in space. The day arrived. Apex made an excited announcement that his ship has already landed in the designated landing field which Dr. Nogrady prepared for Ap ex’s arrival. Yet Dr. Nogrady cannot find the ship. He asked for confirmation from Apex who replied they have landed as confirmed by the engineer of Dr. Nogrady’s triangulation that they are already in the designated landing field. But they cannot be found. Suddenly the communication made a blip with Apex’s cry, why are you attacking us? We came in good faith and friendship! Dr. Nogrady replied, attack what? It’s getting dark, why are you sending your monsters to attack us! A series of cry was heard from the radio of Apex, yet nothing can be found in the landing field. Until finally, a distress call was heard from com of Apex, with a call â€Å"this is Captain Apex of Ship Amegdala on exploration to Earth, we are under attack and cannot survive, please send in rescue immediately!

Manhattan (New york)'s Urban space Essay Example | Topics and Well Written Essays - 2000 words

Manhattan (New york)'s Urban space - Essay Example Manhattan is considered as a regional leader where education, entertainment, communication and health care is concerned and in addition serves a three county population of about 200,000 people in the surrounding areas. Other amenities that Manhattan can boast of are both private and public educational centres and numerous universities that cater to a mixture of diverse cultures. The famous Kansas State University which was established in 1863 was the first successful land - grant university system that was established in the United States. This famous university houses eight colleges that represent 60 different departments of various specialized subjects. Manhattan boasts of beautiful scenic public parks, and zoos like the American zoo and the Sunset zoo. It is also quite famous for various sports facilities which include stunning golf courses. In addition to these, Manhattan is well known for its exceptional trail system that is indispensable to both bikers and walkers and which is also easily accessible to disabled people. Te trail is nine miles long and circles around half of the community. Manhattan City is committed to development and progress and continues in its quest to achieve it. Its municipal planning of the city is not only progressive but works with a vision and forward thinking. Since the 1980’s, one of the most significant developments that took place was the construction of a 300,000 square foot shopping mall situated in downtown Manhattan. The past decade has seen the construction of a new airport terminal called the â€Å"Manhattan Regional Airport.† The city has also seen the construction of the Northeast Community Park and it has now undertaken a major project initiative of downtown redevelopment in order to enhance the Town center Hall north and south of Manhattan. Geographically speaking, the character of Manhattan was largely shaped by its Geographical outlay. It’s strategic location dominates the New York Harbor and hence it emerges as

Assignment Example | Topics and Well Written Essays - 1000 words - 2

Assignment Example The addition of these two variables would then be divided by the original price the investor paid for the stock or lot of stocks. This calculation would give the gross return. The net return is calculated by subtracting the tax expenses associated with the investment from the numerator of the formula. It is important for investors to periodically calculate the return they would achieve if they sold a stock at a particular point in time. This can help investors determine when it is the best moment to sell their stock investment. 2. Contrast systematic and unsystematic risk. There are two types of risks that investors must pay close attention to. The two types of risks are systematic and unsystematic risk. Systematic risk is a risk factor that cannot be control by the investor or the firm due to the fact that it is a market inherent risk. These risk factors affect all firms. Some examples of systematic risks include recessions, wars, inflation, and the occurrence of natural events. In the aftermath of the March 11, 2011 earthquake in Japan the valuation of most Japanese stocks when down a lot. This risk could not have been predicted by an investor. Unsystematic risk is also referred to as firm specific risk or diversifiable risk. Unsystematic risks are risks that can be controlled by the firm. Some examples of these risks include employee strikes, lawsuits, unsuccessful product launches, and the quality of the labor force hired by the firm. A way to offset the effects of unsystematic risks is through diversification. A smart investor is able to reduce the unsystematic risk of their portfolio by purchasing a wide array of investments including blue chip stocks, bonds, and mutual funds. Within the stocks selected by the investor they choose common stocks from firms from different industries. Both systematic and unsystematic risk must be considered by people that are contemplating investing in the stock market. 3. Explain why the total risk of a portfolio is not sim ply equal to the weighted average of the risks of the securities in the portfolio. Many people think because the expected return on a portfolio is calculated as the weighted average of the expected returns of individual stocks that the risk of a portfolio is calculated in the same. Well all those people that thought that way are wrong. Generally speaking the portfolio risk is usually smaller than the weighted average. This occurs because on many instances the risk of different stocks offset each other. A way to measure how the risk of the different stocks of a portfolio is affected is by using the correlation coefficient. The correlation coefficient measures the degree of relationship between two variables. It is possible for a portfolio of two stocks that both have risks to formulate a riskless portfolio if the risks of the two stocks cancel each other out. This can occur because the returns of each stock move in opposite directions. 4. State what beta measures and its uses. The be ta coefficient measures a stock’s sensitivity to fluctuations in the stock market. The normal beta is 1.0. A 1.0 beta implies that the common stock has the same risk as the market. When a company has a beta below 1.0 the common stock of the firm is not affected too much by the market risk. Stocks that have betas above 1.0 are very sensitive to fluctuations in the stock market. A stock that has a beta coefficient of 2.0 implies that the firm is twice as volatile or risky as

Scientific Method and Participant Observation Essay Example for Free

Scientific Method and Participant Observation Essay In the article, â€Å"Researching Dealers and Smugglers,† Patricia Adler discusses her and her husband’s experience using participant observation to collect data from drug dealers and the problems this qualitative method brought. A qualitative method focuses on collecting rich, non-statistical data. This method involves face-to-face interviews and actual participation with the group being researched. The Adlers use this method because it is almost impossible to gather accurate information on people who smuggle drugs. This is true because they are such private and deceitful people. The only way to get the real facts is if the smugglers trust the person. Unfortunately, participant observation brought problems such as the dealers and smugglers being under the influence or going through withdrawal during the interviews and the Adlers mixing their overt and covert roles. The Adlers chose participant observation because they found that using this method allowed them to acquire the most in-depth and rich data than any other method. If criminals like dealers and smugglers were given a survey, it would not work out because they are not just going to tell the truth and risk getting caught by the police. They are specific with who they give information to, so the Adlers had to show them that they could be trusted. They could not have done that with without using participant observation. Although there were many aspects about the Adlers that made them and the research method they used convenient, there were also some risks they had to take. While doing research, the Adlers encountered some problems using this method, one of which was interviewing the dealers and smugglers while they were under the influence of either marijuana or cocaine. In addition, the participants were sometimes withdrawal symptoms, so they were not able to interview properly. Patricia mentions how marijuana and cocaine had different effects on the interviewees. She states, â€Å"marijuana was unproductive for a number of reasons†¦ Often people became confused, sleepy, or involved in eating to varying degrees. ’ On the other hand, cocaine assisted the research procedure by making the dealers feel more comfortable. Cocaine also helped the dealers open up easily. During the interviews, some dealers experienced withdrawal symptoms. It caused them to become malicious with each other or towards the Alders without any warning. The way the Alders solved this problem was by taking precautions when interacting with the dealers. The cocaine use was not a problem for the Adlers, but they most likely dealt with the marijuana issue quite easily since Patricia does not specifically explain how it was solved. In addition, there was another problem the Adlers encountered. The Adlers also found that mixing the overt and covert roles with the members of the group throughout the investigation was another issue. Since the Adlers had different level relationships with every individual, some of the dealers were aware that they were a part of a research project while others were not aware. This sometimes confused the Adlers. Patricia states, â€Å"They [the informants] would made occasional veiled references in front of people, especially when loosened by intoxicants, that made us extremely uncomfortable. † This issue made the couple uncomfortable because they did not want to blow their cover. Patricia and Peter Adler also feared that the participants would think they are police. Peter and Patricia Adler solved this issue by take the necessary safety measures so anyone they did not want to find out. The Adlers encountered various problems while utilizing this qualitative method. They had troubles such as mixing their covert and overt roles and dealing with some of the smugglers and dealers being intoxicated. Therefore this investigation became very risky, but Patricia and her husband finalized by collecting all the data needed. The Adlers also resolved their problems in a cautious way utilizing patience, precaution, and rational and clever thinking. The couple definitely learned a lot throughout the experiment and got more than they anticipated going through it.

PC Monitoring of Dynamometer

PC Monitoring of Dynamometer ABSTRACT The aim of the project PC MONITORING OF DYNAMOMETER is to measure and display the Speed Torque and Power of Motor. The behaviour of motor under load and no load characteristics have been studied with the help of virtual instrumentation. The variations in the motor Speed, Torque and Power at no load torque and full load torque have been analysed. Power determines the efficiency of the motor. Torque is varied by altering resistance in the dynamometer control circuit. The entire system will interface with a PC providing virtual instrumentation and data logging facilities. The graphical programming software has been used to study the characteristics of the motor by loading. Data logging and analysis is done by implementing the concept of LabVIEW. AIMS The aim of the project to build and develop the LabVIEW Program to acquire and analyse the data with the help of ADC card. Speed, Torque and Power of the shunt wound dc motor are acquired and analysed. OBJECTIVES Implement the concept of virtual instrumentation. Develop LabVIEW program to acquire Torque, Speed and Power. Analyse the motor characteristics under load and no load using the visual programming. To show the difference between acquiring the data manually and applying Virtual Instrumentation. Chapter 1 gives the introduction to the Motors, Labview and the literature review to realise the project. Chapter 2 is the study of Virtual Instrumentation and Labview programming. Chapter 3 explains the terms Torque, Speed Power asscociated with the shunt motor. Chapter 4 includes the experimental setup for the project with the specifications and the individual work of each and every component. Chapter 5 discussion part includes the introduction to LabVIEW tools used in the programming for the project. Chapter 6 contains the analysis for the manual operation of the motor when load is applied. Includes Torque, Speed, and Voltage characteristics. Chapter 7 includes the labview program for Speed, Torque and Power with the analysis for motor under loaded conditions. Chapter 8 includes the conclusions and the future scope of the project. CHAPTER-1 INTRODUCTION The extent to which electrical energy is used has influence on the development of industry and the economic prosperity of nation. Therefore rather than conserving the energy, methods need to be implemented to control the electrical energy and hence it can be possible only when the problems associated with the system are analysed and rectified with use of technology and time limitation. In industries the shunt wound motors are used where speed control is a critical aspect. The shunt wound motors are highly flexible, versatile and even the operation costs are minimum. The speed of rollers in large rolling mills is an very important aspect to be measured. In this type of application the rpm of each motor is measured and compared to setpoints. Under load motors draw more current which may damage the working capabilities of the motor thus causing damage. Hence there is a need for operating range for a motor to work even in extreme conditions. Characteristics such as Speed, Torque, Power, operating voltage and current are important for selection of motors. Power is the capability of the motor to do some work. The motor characteristics at high speed are highly different from that to low speeds. The power of motors is very low at high speeds consuming very less of electric distribution. The shunt wound type of motors run basically at a constant speed, regardless of load. In industries the shunt wound motors are used where speed control is a critical aspect. The shunt wound motors are highly flexible, versatile and even the operation costs are minimum. Motors runs at certain speed depending on the shunt field and armature. The armature produces the back EMF to maintain a certain speed as the shaft rotates. The back EMF is produced when the rotor rotates. As the load increases it causes the armature shaft to slow down and in this case the back EMF produced will be decreased. There are two methods for controlling the speed of a motor. The first one is by increasing or decreasing the voltage supply to the field. If less voltage is given the motor runs at low speed and as the voltage is increased the speed increases accordingly. The other method is by inserting resistance in the field circuit which makes the speed to vary upon changing the load. When load is increased apparently speed is decreased and vice versa. The change in load and speed torque and power can be acquired with the Software designed for acquisition and data analysis which is LabVIEW. LABVIEW Lab view in short is for Laboratory Virtual Instrument Engineering Workbench. Labview is a very powerful and flexible instrumentation and analysis software developed by National Instruments. Labview is a programme particularly developed for engineers and scientists working in automation industry and data analysis. The principle Labview works is the data flow. They are broken into wires and nodes. The inputs and outputs are considered a node. It has got the built in libraries for Data Acquisition, Instrument Control and data analysis. Data acquisition is to measure electrical or physical quantities such as voltage, current, temperature, pressure, or sound. PC-based data acquisition is a combination of hardware, application software, and pc for logging the data. Software is highly important to data acquisition systems. The reduction of hardware can be done if an effective software is designed. Data Acquisition software collects the data and displays the data. Ease in data analysis and presentation are the major reasons for using the computers in data acquisition . LabVIEW can acquire accurate and timely measurements for monitoring industrial and control system applications. LabVIEW quickly connects to number of industrial sensors which acquires data at very high speeds. The tools provided in the LabVIEW can perform advanced signal processing, frequency analysis, digital signal processing. LabVIEW can also be applied for machine vision, motion control, and machine condition monitoring In LabVIEW, the logic can be easily developed by using the drag drop graphical icons instead of writing lines of programs. Time taking programmes can be written in very short period using labview. This graphical language can be used in industrial applications to control instruments, build automated test systems, and acquire data virtually and many more. LITERATURE REVIEW The literature on fundamentals and applications of data acquisition, instrumentation, and control to engineering and technology is very extensive. Peter T lee conducted experiments based on the torque-speed characteristics of a motor with the help of mechanical design and 3-D using the computer. The computer simulation was drawn from a mechanical model. Upon implementing the above methods a conclusion has been made on the torque- speed characteristics of dc shunt motor. The maximum speed of the motor is at no load applying zero torque. The stall torque represents a point where the motor is at zero speed. Dynamic and steady state response mathematical models were designed. The torque meter is used to calculate the torque. The torque speed curve obtained is is bit nonlinear. The mechanical design produced had few constraints which led to the nonlinearity of the curves. As described by Comer in dc electric motor control systems series motors develop high torques at very low speeds when compared to shunt motors. For a given voltage the speed-torque characteristics show a linear decrease with the speed. Motor speed is controlled by controlling the voltage to the armature which involves construction of a circuit involving inverter amplifier, opamps, pulse width modulator which is confusing and rather time taking. Saffet Ayasun proposed Matlab and Simpower systems for studying the steady state and transient characteristics of electrical machines. Simulink models have been designed to control the speed in three ways. Simulink has been proposed for field resistance control, armature resistance control and armature voltage control. The conclusions drawn from the simulink modelling is that the electrical machines are perfectly integrated with the software. Pierre Guillemin proposed a technique based on fuzzy logic for controlling a dc motor. His work included on motors in food processing industries whose speed varies upon load. He worked on designing the fuzzy logic for the speed to be constant even though theres a much change in the load. The main methodlogy is top control the voltage involving the techniques of phase angle modulation and pulse width modulation. Use of fuzzy logic avoided the need for mathematical modelling. Real time test and acquisition has been done using the pc and eprom version of ST6 device has been used for controlling the fuzzy logic. So the main disadvantage of using ST6 is that it needs pages of text coding and has a instruction list of 40./p> From the above proposed techniques we can conclude that it not only makes the system complicated but also it takes lot of time to design a program and create a logic for it to run. Manual way of operating may result in human errors decreasing the quality of product. Hence the need for data acquisition at high speed without much implementation of hardware components can be possible with the help of virtual instrumentation. Virtual instrumentation is the combination of modular software and I/O with software as its main tool. Today in any type of computer aided manufacturing project work and laboratory tests, precision and reliability of instrumentation and data acquisition techniques may cause major impacts on results and outcomes. Therefore, there is a need to gain knowledge and skills to obtain any type of physical or virtual data on manufacturing, testing, measurement, and protection areas. METHODOLOGY The data has been acquired from a dynamometer motor system and is displayed on the pc for analysis involving a communication between hardware and software. The ADC card communicates between the systems with the help of a data cable. The conditioned signals are connected to the channels of the DAQ board. The hardware system is in conjunction with the PC running LabVIEW. LabVIEW contains front panel and the block diagram which displays the data acquired and further analysis can be done. The front panel and block diagram are responsible for the understanding of programming involved. CHAPTER-2 VIRTUAL INSTRUMENTATION Virtual Instrumentation is the combination of software, Input/Output hardware for the user desired applications. Sofware is the heart of Virtual Instrumentation. Instrumentation is basically divided into two types one is natural instrumentation and the other is Virtual Instrumentation. Natural instrumentation consists of hardware components and Virtual instrumentation is of Software with limited hardware components. The main difference between natural instrumentation and virtual instrumentation is that the software component of virtual instruments is more reliable and versatile when compared to the hardware components. TRADITIONAL INSTRUMENT VS VIRTUAL INSTRUMENT The above Fig shows the difference between natural Instrument and a Virtual Instruments. In natural instrument a embedded chip is fixed to do a particular job which is not flexible whereas in a virtual instrument software can be modified and used for different applications as per the requirement. LabVIEW Labview stands for Laboratory Virtual Instrument Engineering Workbench. LabView is a visual programming language from National Instruments. The graphical language is originally named G. LabVIEW is used for data acquisition, industrial automation and instrument control. The programs in labview are called as virtual instruments .The graphical language can be easily identified by visual identification which makes it very easier to understand. Labview programs are termed as virtual instruments as they generally look and work as the instruments. Labview comes with a mechanism which allows data to pass between front panel and the block diagram. Labview is used by engineers and scientists to develop the sophisticated measurement, test, analyse control systems using graphical icons and wires. Labview can integrate with thousands of hardware devices and numerous built libraries are provided for analysis and data visualisation DATAFLOW PROGRAMMING The programming language used in LabVIEW is called G which is termed as a dataflow language. Labview Programme execution is determined by the way the block diagram is structured. Drawing wires are used to connect different function nodes. The information is transferred through the wires. The program is executed as soon as the input is available. G program is capable of parallel execution. The dataflow completely defines the execution sequence, and can be fully controlled by the programmer. The execution sequence is perfectly defined in Labview as defined in some software languages. GRAPHICAL PROGRAMMING LabVIEW programs are called virtual instruments. Each VI has three components: Block diagram Front panel Connector pane. Data Flow is the principle for the VI execution. The VI are data driven whereas the normal text coding are instruction driven as specified by the programmer. When all the input data is available then the node starts executing and the processed data is supplied to the output terminals. The graphical language makes it very easier for the programmers in which virtual instruments can be dragged and dropped as per requirement. Stand alone applications can be built with the help of advanced labview development systems. The front panel serves as a user interface between the user and the pc. When front panel is dropped as a node onto the block diagram, the node inputs and outputs can be defined in with the help of connector pane. CHAPTER -3 DC SHUNT MOTOR A motor is a machine which converts electrical energy to mechanical or rotating energy. DC motors are basically divided into two types. Series motors and Shunt motor. Shunt Motor are the one in which the field is parallel to the load. In shunt motors the armature is mounted on the motor shaft. The rotating part in the dc motor is termed as the armature. The windings are located in the slots on the surface of the armature. When the current is supplied to the armature windings it creates a magnetic field that reacts with the field poles. Hence this magnetic field develops a torque which turn the rotor that is the armature. While the rotor rotates it induces a voltage which is opposite to the supplied voltage and hence emf is generated. At start the resistance is high and as the motor picks up the speed the resistance is reduced gradually. In manual start the resistance is controlled by the man at work whereas in automatic start of motor the armature voltage or current is taken into consideration and the resistance is corrected in the begging of start . The increase in armature voltage results in increase in speed and as the armature voltage is decreased the speed decreases. Torque is directly proportional to armature current. Increases in armature current causes the increase in torque.The rotation of the armature can be reversed by reversing the current direction. At start of the motor the current is high. As armature starts rotating the back emf increases gradually with the speed and the current decreases. When the speed of the armature comes to constant the back emf is stable approaching the induced voltage. If a mechanical load is applied the speed decreases and hence the counter emf decreases. This decreases in counter emf increases the differential voltage and thus increases the input current supply to motor. Torque is directly proportional to armature magnetic field strength. Armature magnetic field is directly proportional to armature current which in turn depends on mechanical load applied. Hence any increase in mechanical load increases the armature current and armature magnetic field strength and thus the Torque increases. Thus the speed of the motor decreases. DC motors are differentiated based on their voltage, torque, speed and power. TORQUE Torque is the rotating force of the shaft of a motor. This rotating force is developed due to the interaction of magnetic field between field windings and the field poles. The torque of a motor can be determined by connecting it to prony brake The torque in general terms is the force exerted by the shaft of a motor. i.e if force is applies to a lever which is free to rotate about one fixed point the lever will rotate unless restrained. The torque is defined as t=Fr or Frsin?. The torque which is produced in clockwise is called a clockwise torque and the torque which is obtained in anticlockwise is called anticlockwise torque. FULL LOAD TORQUE The continous torque motor can support without overheating under the specified time rating is full load torque. PEAK TORQUE Peak torque is the maximum torque required at any point. Peak torque is delivered to motor without much overheating the motor. Peak torque is normally less than the stall torque. PULL OUT TORQUE This is maximum torque of the rotating shaft when operated at high speed and full voltage. Pull out torque is also considered as the breakdown torque. STARTING TORQUE Torque exerted by the motor when energized at full voltage with its shaft locked is starting torque. It is also termed as locked rotor torque. SPEED The motors convert electrical energy into mechanical energy. The rotational energy is used to lift things, propel things, turn things, etc. When a specific voltage is supplied to a motor, it rotates the output shaft at a particular speed. The angular velocity, is measured in rad/s, rps, rpm. Speed of a shunt motor can be controlled in three ways. Field Control Method Armature Control Method Armature Voltage Control method FIELD CONTROL METHOD In field control method the speed of the armature is controlled by adjusting the field current. upto certain speed the counter emf and the speed remains constant. Field Control method is also termed as constant speed drive. ARMATURE RESISTANCE CONTROL In Armature resistance control external resistance is inserted in the armature circuit for controlling the speed of motor. The insertion of resistance keeps the armature current constant in certain speed range. The main disadvantages using this techniques include powerloss in external resistance and overall low efficiency when speed is reduced to great extent. ARMATURE VOLTAGE CONTROL Armature voltage control is preferred over the other methods as powerloss and low efficiency is avoided. In this method the shunt field current is kept constant while varying the armature voltage. Hence the armature current and the flux generated remains constant. At certain current the torque remains constant since armature current is directly proportional to torque. Thus the speed of the motor can be controlled to certain range. SPEED REGULATION The speed regulation for a dc motor is the ratio of change in speed from no load to full loadf load speed. POWER The power of a motor is defined as the capability of motor to do given amount of work.Power of a motor depends on torque, speed of the shaft and the amount of time the time operates. Electric motors are rated generally on their maximum efficiency. Thus Greater the horse power of a motor greater is the working range. Operation of a motor more than rated horse power leads to overheating of the motor thus causing a stall. This may even damage the motor in the long run. The power of motor can be determined by connecting it to a dynamometer. DYNAMOMETER Dynamometer is a device which measures force and power. Eddy current Dynamometer consists of a stator in which electromagnets and rotor disc are coupled to shaft of the engine .When a rotor is made to rotate the eddy currents are produced in the stator due to magnetic flux which is created by the filed current in electromagnets. This type of dynamometers requires some cooling arrangement as the eddy currents produced dissipates heat energy. The moment arm is used to measure the torque. In this kind of dynamometers the load is controlled by the regulation of currents in electromagnetic fields. Design Cycle The selection of appropriate hardware and software was an essential part of this project. The first section of this chapter 4 gives the information of hardware components of a system, the diagrams and specifications are discussed .The second part of this chapter describes the hardware design process and software is described in the third section ,code used for the system are going to be presented. CHAPTER 4 EXPERIMENTAL SETUP DC SHUNT MOTOR-WORKING The DC motor has two basic parts: The choosen shunt Dc motor is the motor which converts electrical power to mechanical power. The shunt motor is different from that of series motor. In the shunt type dc motor field winding is connected in parallel with the armature. The field winding is parallel to armature and this is referred as shunt winding and the motor is called a shunt motor. The rated rpm of the motor is 1500. The speed of the motor can be increased or decreased with the help of a drive. The current can be increased or decreased to set the speed. To reduce the speed of the motor mechanical load can be applied. Torque can be applied to reduce the speed of the motor. Under loaded conditions the speed of the motor reduces. Motor can be applied until it reaches the rated torque of the motor. If the load goes beyond the rated torque it starts drawing high curent and after some time it comes to stall. CHARACTERISTICS OF SHUNT MOTOR Shunt motors run at constant speed even when there is huge variation in the load. The Speed of the shunt-wound motors may be regulated in two ways. The first way is by putting resistance in series with the armature, through which the speed is decreased and the second method is by inserting resistance in the field by which the speed will vary as the motor is loaded. The characteristics of a shunt-wound motor is that it has a very good speed regulation, and is aconstant speed motor, though the speed slightly decreases as load is increased. Shunt-wound motors are used mostly in industrial and automotive applications where accurate measurement of Torque, Speed are highly necessary. EDDY CURRENT DYNAMOMETER A dynamometer is a device used to load the motor which also indicates the torque. The dynamometer used in this project works on hysteresis brake principle. The dynamometer system mainly consists of three parts: Dynamometer Torque indicator Power Supply Eddy current dynamometers are the actuated braking systems. This braking system develops load torque with the interaction from the dc magnetic field produced by the windings on the stator and induced eddy currents in the rotor. When the magnetic field is added around the rotor it causes eddy currents. These eddy currents help in slowing down the speed. Dynamometer01CJC.svg The torque developed in the dynamometer is transmitted to the stator which is free to rotate over an arc and this is used to deflect a spring balance and so the torque can be directly measured on a scale. Eddy current dynamometer comes with a rotary potentiometer which works on the principle ROTARY POTENTIOMETER Rotary potentiometers come with a spiral resistive strip, and a wiper which moves axially as it rotates. As the wiper moves across the resistive strip resistance changes. VOLTAGE DIVIDER The voltage divider is used to know the output voltage when input voltage is given across the resistance. The ouput voltage depends upon the input voltage given and the resistor chosen. The resistor choosen is 10k? and an input voltage of 5v is given to the voltage divider. VOLTAGE DIVIDER The input voltage is given across the termicals 1 and 2 and the output voltage is taken across the terminals 2 and 3. Connect the voltmeter across the resistance . Now switch the output voltage off and manipulate the input voltage to 5v. Now switch on the output toggle button on . The input voltage is set to 5v. AC TACHOMETER: Tachometers are used to measure the angular speed of a rotating shaft. The speed is measured in revolutions per minute (rpm). A tachometer works on the principle that it the speed of rotating shaft is determined by the variation in output frequency signal or voltage. As the speed increases the voltage level and the frequency increases. CONTACT TYPE AC TACHOMETER The above fig shows the tachometer coupled to the motor. Ac tachometer used in the design is rated at 0.5v/100rpm. It shows that increase in speed increases. For every 100rpm variation the voltage increases by 0.5 rpm. The voltage signal from the ac tachometer is given to the simple presicion rectifier which further converts the signal to dc voltage. SIMPLE PRECISION FULL WAVE RECTIFIER A simple precision full wave rectifier converts the ac voltage to dc voltage. The simple precision full wave rectifier is built with operation amplifier which works on the principle of differential voltage. An operational amplifier is a DC-coupled high-gain electronic voltage amplifier which has differential inputs and a single output. Negative feed back controls the gain in the opamps. The output goes positive when the non inverting input(+) goes more positive than the inverting input (-) and vice versa When the input signal goes positive again, the op amps output voltage will take time to go back to zero, then to forward bias the diode and produce an output. The time taken is determined by the opamps slew rate. Slew rate is the maximum attainable range of the output voltage. Slew rate limits the highest frequency of the sin wave. The opamp 741 choosen in the project has a slew rate of 0.5v per micro seconds SIMPLE PRECISION FULL WAVE RECTIFIER The negative voltage at the input through the diode and resistor. The positive half cycles appear at the output of the second diode. When positive voltage is given the feed back is given by the diodes and hence negative cycles . The positive cycles and negative cycles are summed differentially to get the output voltage. The opamp 741 choosen in the project has a slew rate of 0.5v per micro seconds For measurement applications the signal has to be ripple free. Hence low pass filter can be used to achieve the signal free from ripples. RC LOW PASS FILTER Resistor Capacitance generally termed as RC circuits are used in filtering a signal waveform, thus changing the relative amounts of high frequency and low information in their output signals compared to their input signals. RC filter is a common application for smoothing a signal. The RC circuit has a capacitor and a resistor in which are connected in series. The charged capacitor would discharge its energy into the resistor placed in series with it. This voltage across the capacitor is found through Kirchhoffs current law which says that the current coming from capacitor is equal the current flowing out through the resistor. The linear differential eqn. can be given by ANALOG TO DIGITAL CARD Analog to Digital conversion is interfacinf the analog I/O with the Digital I/O. ADC cnversion takes place in three stages. They are Sampling, Quantisation and encoding. The ADC card which is used in the Project is CIO-DASO8/JR-A0. SAMPLING The analog input cannot be directly sent to the pc. The ADC digitises the analog input signal continusly. The proper reconstruction of signal is possible only when the sampling rate is twice the highest frequency component. If the sampling rate is under that the problem of Alaising occurs. To eleminate the problems of aliasing the signal must be sampled at a rate higher than Nyquist frequency rate. The fig shows the sampling rates and the construction of the signal. If a signal is sampled at too low rate perfect reconstruction of signal is nt possible which results in the loss of data. QUANTISATION Quantisation represents the signal in discrete and certainj voltage levels. Quantisation actually is approximating the signals to the lowest possible range. The fig below shows the sampling of a singal which is then quatises indicated by a red line. The quantization is necessary as during the sampling the small range of signals may not be digitised. This results in loss of information. By approximating the values the reconstruction of signal is perfect. CODING Coding is the process of converting the sampled signals to n bits which are represented by 0 and 1s. These bits represent certain voltage levels which is given by the resolution. SPECIFICATIONS When acquiring data to a computer, an analog to digital Conveter takes an analog signal and digitises the signal. The sigal is digitised to sertain binary numbers. These binary numbers represents respective voltage levels. Resolution refers to the number of binary levels ADC can represent a signal. The resolution of a n bit ADC can be by taking the value . The ADC card which is used in the Project is CIO-DASO8/JR-A0. DATA ACQUISITION AND CONTROL ARCHITECTURE Data acquisition and cntrol architectlog input is given to the pc via ADC which converts the analog input to digital input. The data can be transmitted bidirectionally with the help of data acquisition device. Labview Software is loaded in the pc which acquires the data with the help of built in libraraies. INSTACAL Instacal is software which manages the data acquisition hardware. It is used in calibration of the boards attached. It scans all the internal registers and the electronic equipment and if any fault found error messages are shown. The ADC is calibrated with the help of instacal to check whether the data logger is accurate or not. CHAPTER 5 LABVIEW Labview environment is opened by when new VI is selected from the start up screen. The file menu contains commands for file manipulations. Edit menu is used to modify the block diagram and front panel objects. By default the undo or redo settings for a VI are 8. It can be manipulated as per the requirement. Operate menu acts in running or stopping a VI or to change the settings of VI. The tools menu acts as interface in communicating with the data acquisition boards to build the applications and in enabling the web server. WINDOW INTRODUCTION Labview programming is mainly divided into two panels. The first one is the Front Panel and all the controls and indicators are in l PC Monitoring of Dynamometer PC Monitoring of Dynamometer ABSTRACT The aim of the project PC MONITORING OF DYNAMOMETER is to measure and display the Speed Torque and Power of Motor. The behaviour of motor under load and no load characteristics have been studied with the help of virtual instrumentation. The variations in the motor Speed, Torque and Power at no load torque and full load torque have been analysed. Power determines the efficiency of the motor. Torque is varied by altering resistance in the dynamometer control circuit. The entire system will interface with a PC providing virtual instrumentation and data logging facilities. The graphical programming software has been used to study the characteristics of the motor by loading. Data logging and analysis is done by implementing the concept of LabVIEW. AIMS The aim of the project to build and develop the LabVIEW Program to acquire and analyse the data with the help of ADC card. Speed, Torque and Power of the shunt wound dc motor are acquired and analysed. OBJECTIVES Implement the concept of virtual instrumentation. Develop LabVIEW program to acquire Torque, Speed and Power. Analyse the motor characteristics under load and no load using the visual programming. To show the difference between acquiring the data manually and applying Virtual Instrumentation. Chapter 1 gives the introduction to the Motors, Labview and the literature review to realise the project. Chapter 2 is the study of Virtual Instrumentation and Labview programming. Chapter 3 explains the terms Torque, Speed Power asscociated with the shunt motor. Chapter 4 includes the experimental setup for the project with the specifications and the individual work of each and every component. Chapter 5 discussion part includes the introduction to LabVIEW tools used in the programming for the project. Chapter 6 contains the analysis for the manual operation of the motor when load is applied. Includes Torque, Speed, and Voltage characteristics. Chapter 7 includes the labview program for Speed, Torque and Power with the analysis for motor under loaded conditions. Chapter 8 includes the conclusions and the future scope of the project. CHAPTER-1 INTRODUCTION The extent to which electrical energy is used has influence on the development of industry and the economic prosperity of nation. Therefore rather than conserving the energy, methods need to be implemented to control the electrical energy and hence it can be possible only when the problems associated with the system are analysed and rectified with use of technology and time limitation. In industries the shunt wound motors are used where speed control is a critical aspect. The shunt wound motors are highly flexible, versatile and even the operation costs are minimum. The speed of rollers in large rolling mills is an very important aspect to be measured. In this type of application the rpm of each motor is measured and compared to setpoints. Under load motors draw more current which may damage the working capabilities of the motor thus causing damage. Hence there is a need for operating range for a motor to work even in extreme conditions. Characteristics such as Speed, Torque, Power, operating voltage and current are important for selection of motors. Power is the capability of the motor to do some work. The motor characteristics at high speed are highly different from that to low speeds. The power of motors is very low at high speeds consuming very less of electric distribution. The shunt wound type of motors run basically at a constant speed, regardless of load. In industries the shunt wound motors are used where speed control is a critical aspect. The shunt wound motors are highly flexible, versatile and even the operation costs are minimum. Motors runs at certain speed depending on the shunt field and armature. The armature produces the back EMF to maintain a certain speed as the shaft rotates. The back EMF is produced when the rotor rotates. As the load increases it causes the armature shaft to slow down and in this case the back EMF produced will be decreased. There are two methods for controlling the speed of a motor. The first one is by increasing or decreasing the voltage supply to the field. If less voltage is given the motor runs at low speed and as the voltage is increased the speed increases accordingly. The other method is by inserting resistance in the field circuit which makes the speed to vary upon changing the load. When load is increased apparently speed is decreased and vice versa. The change in load and speed torque and power can be acquired with the Software designed for acquisition and data analysis which is LabVIEW. LABVIEW Lab view in short is for Laboratory Virtual Instrument Engineering Workbench. Labview is a very powerful and flexible instrumentation and analysis software developed by National Instruments. Labview is a programme particularly developed for engineers and scientists working in automation industry and data analysis. The principle Labview works is the data flow. They are broken into wires and nodes. The inputs and outputs are considered a node. It has got the built in libraries for Data Acquisition, Instrument Control and data analysis. Data acquisition is to measure electrical or physical quantities such as voltage, current, temperature, pressure, or sound. PC-based data acquisition is a combination of hardware, application software, and pc for logging the data. Software is highly important to data acquisition systems. The reduction of hardware can be done if an effective software is designed. Data Acquisition software collects the data and displays the data. Ease in data analysis and presentation are the major reasons for using the computers in data acquisition . LabVIEW can acquire accurate and timely measurements for monitoring industrial and control system applications. LabVIEW quickly connects to number of industrial sensors which acquires data at very high speeds. The tools provided in the LabVIEW can perform advanced signal processing, frequency analysis, digital signal processing. LabVIEW can also be applied for machine vision, motion control, and machine condition monitoring In LabVIEW, the logic can be easily developed by using the drag drop graphical icons instead of writing lines of programs. Time taking programmes can be written in very short period using labview. This graphical language can be used in industrial applications to control instruments, build automated test systems, and acquire data virtually and many more. LITERATURE REVIEW The literature on fundamentals and applications of data acquisition, instrumentation, and control to engineering and technology is very extensive. Peter T lee conducted experiments based on the torque-speed characteristics of a motor with the help of mechanical design and 3-D using the computer. The computer simulation was drawn from a mechanical model. Upon implementing the above methods a conclusion has been made on the torque- speed characteristics of dc shunt motor. The maximum speed of the motor is at no load applying zero torque. The stall torque represents a point where the motor is at zero speed. Dynamic and steady state response mathematical models were designed. The torque meter is used to calculate the torque. The torque speed curve obtained is is bit nonlinear. The mechanical design produced had few constraints which led to the nonlinearity of the curves. As described by Comer in dc electric motor control systems series motors develop high torques at very low speeds when compared to shunt motors. For a given voltage the speed-torque characteristics show a linear decrease with the speed. Motor speed is controlled by controlling the voltage to the armature which involves construction of a circuit involving inverter amplifier, opamps, pulse width modulator which is confusing and rather time taking. Saffet Ayasun proposed Matlab and Simpower systems for studying the steady state and transient characteristics of electrical machines. Simulink models have been designed to control the speed in three ways. Simulink has been proposed for field resistance control, armature resistance control and armature voltage control. The conclusions drawn from the simulink modelling is that the electrical machines are perfectly integrated with the software. Pierre Guillemin proposed a technique based on fuzzy logic for controlling a dc motor. His work included on motors in food processing industries whose speed varies upon load. He worked on designing the fuzzy logic for the speed to be constant even though theres a much change in the load. The main methodlogy is top control the voltage involving the techniques of phase angle modulation and pulse width modulation. Use of fuzzy logic avoided the need for mathematical modelling. Real time test and acquisition has been done using the pc and eprom version of ST6 device has been used for controlling the fuzzy logic. So the main disadvantage of using ST6 is that it needs pages of text coding and has a instruction list of 40./p> From the above proposed techniques we can conclude that it not only makes the system complicated but also it takes lot of time to design a program and create a logic for it to run. Manual way of operating may result in human errors decreasing the quality of product. Hence the need for data acquisition at high speed without much implementation of hardware components can be possible with the help of virtual instrumentation. Virtual instrumentation is the combination of modular software and I/O with software as its main tool. Today in any type of computer aided manufacturing project work and laboratory tests, precision and reliability of instrumentation and data acquisition techniques may cause major impacts on results and outcomes. Therefore, there is a need to gain knowledge and skills to obtain any type of physical or virtual data on manufacturing, testing, measurement, and protection areas. METHODOLOGY The data has been acquired from a dynamometer motor system and is displayed on the pc for analysis involving a communication between hardware and software. The ADC card communicates between the systems with the help of a data cable. The conditioned signals are connected to the channels of the DAQ board. The hardware system is in conjunction with the PC running LabVIEW. LabVIEW contains front panel and the block diagram which displays the data acquired and further analysis can be done. The front panel and block diagram are responsible for the understanding of programming involved. CHAPTER-2 VIRTUAL INSTRUMENTATION Virtual Instrumentation is the combination of software, Input/Output hardware for the user desired applications. Sofware is the heart of Virtual Instrumentation. Instrumentation is basically divided into two types one is natural instrumentation and the other is Virtual Instrumentation. Natural instrumentation consists of hardware components and Virtual instrumentation is of Software with limited hardware components. The main difference between natural instrumentation and virtual instrumentation is that the software component of virtual instruments is more reliable and versatile when compared to the hardware components. TRADITIONAL INSTRUMENT VS VIRTUAL INSTRUMENT The above Fig shows the difference between natural Instrument and a Virtual Instruments. In natural instrument a embedded chip is fixed to do a particular job which is not flexible whereas in a virtual instrument software can be modified and used for different applications as per the requirement. LabVIEW Labview stands for Laboratory Virtual Instrument Engineering Workbench. LabView is a visual programming language from National Instruments. The graphical language is originally named G. LabVIEW is used for data acquisition, industrial automation and instrument control. The programs in labview are called as virtual instruments .The graphical language can be easily identified by visual identification which makes it very easier to understand. Labview programs are termed as virtual instruments as they generally look and work as the instruments. Labview comes with a mechanism which allows data to pass between front panel and the block diagram. Labview is used by engineers and scientists to develop the sophisticated measurement, test, analyse control systems using graphical icons and wires. Labview can integrate with thousands of hardware devices and numerous built libraries are provided for analysis and data visualisation DATAFLOW PROGRAMMING The programming language used in LabVIEW is called G which is termed as a dataflow language. Labview Programme execution is determined by the way the block diagram is structured. Drawing wires are used to connect different function nodes. The information is transferred through the wires. The program is executed as soon as the input is available. G program is capable of parallel execution. The dataflow completely defines the execution sequence, and can be fully controlled by the programmer. The execution sequence is perfectly defined in Labview as defined in some software languages. GRAPHICAL PROGRAMMING LabVIEW programs are called virtual instruments. Each VI has three components: Block diagram Front panel Connector pane. Data Flow is the principle for the VI execution. The VI are data driven whereas the normal text coding are instruction driven as specified by the programmer. When all the input data is available then the node starts executing and the processed data is supplied to the output terminals. The graphical language makes it very easier for the programmers in which virtual instruments can be dragged and dropped as per requirement. Stand alone applications can be built with the help of advanced labview development systems. The front panel serves as a user interface between the user and the pc. When front panel is dropped as a node onto the block diagram, the node inputs and outputs can be defined in with the help of connector pane. CHAPTER -3 DC SHUNT MOTOR A motor is a machine which converts electrical energy to mechanical or rotating energy. DC motors are basically divided into two types. Series motors and Shunt motor. Shunt Motor are the one in which the field is parallel to the load. In shunt motors the armature is mounted on the motor shaft. The rotating part in the dc motor is termed as the armature. The windings are located in the slots on the surface of the armature. When the current is supplied to the armature windings it creates a magnetic field that reacts with the field poles. Hence this magnetic field develops a torque which turn the rotor that is the armature. While the rotor rotates it induces a voltage which is opposite to the supplied voltage and hence emf is generated. At start the resistance is high and as the motor picks up the speed the resistance is reduced gradually. In manual start the resistance is controlled by the man at work whereas in automatic start of motor the armature voltage or current is taken into consideration and the resistance is corrected in the begging of start . The increase in armature voltage results in increase in speed and as the armature voltage is decreased the speed decreases. Torque is directly proportional to armature current. Increases in armature current causes the increase in torque.The rotation of the armature can be reversed by reversing the current direction. At start of the motor the current is high. As armature starts rotating the back emf increases gradually with the speed and the current decreases. When the speed of the armature comes to constant the back emf is stable approaching the induced voltage. If a mechanical load is applied the speed decreases and hence the counter emf decreases. This decreases in counter emf increases the differential voltage and thus increases the input current supply to motor. Torque is directly proportional to armature magnetic field strength. Armature magnetic field is directly proportional to armature current which in turn depends on mechanical load applied. Hence any increase in mechanical load increases the armature current and armature magnetic field strength and thus the Torque increases. Thus the speed of the motor decreases. DC motors are differentiated based on their voltage, torque, speed and power. TORQUE Torque is the rotating force of the shaft of a motor. This rotating force is developed due to the interaction of magnetic field between field windings and the field poles. The torque of a motor can be determined by connecting it to prony brake The torque in general terms is the force exerted by the shaft of a motor. i.e if force is applies to a lever which is free to rotate about one fixed point the lever will rotate unless restrained. The torque is defined as t=Fr or Frsin?. The torque which is produced in clockwise is called a clockwise torque and the torque which is obtained in anticlockwise is called anticlockwise torque. FULL LOAD TORQUE The continous torque motor can support without overheating under the specified time rating is full load torque. PEAK TORQUE Peak torque is the maximum torque required at any point. Peak torque is delivered to motor without much overheating the motor. Peak torque is normally less than the stall torque. PULL OUT TORQUE This is maximum torque of the rotating shaft when operated at high speed and full voltage. Pull out torque is also considered as the breakdown torque. STARTING TORQUE Torque exerted by the motor when energized at full voltage with its shaft locked is starting torque. It is also termed as locked rotor torque. SPEED The motors convert electrical energy into mechanical energy. The rotational energy is used to lift things, propel things, turn things, etc. When a specific voltage is supplied to a motor, it rotates the output shaft at a particular speed. The angular velocity, is measured in rad/s, rps, rpm. Speed of a shunt motor can be controlled in three ways. Field Control Method Armature Control Method Armature Voltage Control method FIELD CONTROL METHOD In field control method the speed of the armature is controlled by adjusting the field current. upto certain speed the counter emf and the speed remains constant. Field Control method is also termed as constant speed drive. ARMATURE RESISTANCE CONTROL In Armature resistance control external resistance is inserted in the armature circuit for controlling the speed of motor. The insertion of resistance keeps the armature current constant in certain speed range. The main disadvantages using this techniques include powerloss in external resistance and overall low efficiency when speed is reduced to great extent. ARMATURE VOLTAGE CONTROL Armature voltage control is preferred over the other methods as powerloss and low efficiency is avoided. In this method the shunt field current is kept constant while varying the armature voltage. Hence the armature current and the flux generated remains constant. At certain current the torque remains constant since armature current is directly proportional to torque. Thus the speed of the motor can be controlled to certain range. SPEED REGULATION The speed regulation for a dc motor is the ratio of change in speed from no load to full loadf load speed. POWER The power of a motor is defined as the capability of motor to do given amount of work.Power of a motor depends on torque, speed of the shaft and the amount of time the time operates. Electric motors are rated generally on their maximum efficiency. Thus Greater the horse power of a motor greater is the working range. Operation of a motor more than rated horse power leads to overheating of the motor thus causing a stall. This may even damage the motor in the long run. The power of motor can be determined by connecting it to a dynamometer. DYNAMOMETER Dynamometer is a device which measures force and power. Eddy current Dynamometer consists of a stator in which electromagnets and rotor disc are coupled to shaft of the engine .When a rotor is made to rotate the eddy currents are produced in the stator due to magnetic flux which is created by the filed current in electromagnets. This type of dynamometers requires some cooling arrangement as the eddy currents produced dissipates heat energy. The moment arm is used to measure the torque. In this kind of dynamometers the load is controlled by the regulation of currents in electromagnetic fields. Design Cycle The selection of appropriate hardware and software was an essential part of this project. The first section of this chapter 4 gives the information of hardware components of a system, the diagrams and specifications are discussed .The second part of this chapter describes the hardware design process and software is described in the third section ,code used for the system are going to be presented. CHAPTER 4 EXPERIMENTAL SETUP DC SHUNT MOTOR-WORKING The DC motor has two basic parts: The choosen shunt Dc motor is the motor which converts electrical power to mechanical power. The shunt motor is different from that of series motor. In the shunt type dc motor field winding is connected in parallel with the armature. The field winding is parallel to armature and this is referred as shunt winding and the motor is called a shunt motor. The rated rpm of the motor is 1500. The speed of the motor can be increased or decreased with the help of a drive. The current can be increased or decreased to set the speed. To reduce the speed of the motor mechanical load can be applied. Torque can be applied to reduce the speed of the motor. Under loaded conditions the speed of the motor reduces. Motor can be applied until it reaches the rated torque of the motor. If the load goes beyond the rated torque it starts drawing high curent and after some time it comes to stall. CHARACTERISTICS OF SHUNT MOTOR Shunt motors run at constant speed even when there is huge variation in the load. The Speed of the shunt-wound motors may be regulated in two ways. The first way is by putting resistance in series with the armature, through which the speed is decreased and the second method is by inserting resistance in the field by which the speed will vary as the motor is loaded. The characteristics of a shunt-wound motor is that it has a very good speed regulation, and is aconstant speed motor, though the speed slightly decreases as load is increased. Shunt-wound motors are used mostly in industrial and automotive applications where accurate measurement of Torque, Speed are highly necessary. EDDY CURRENT DYNAMOMETER A dynamometer is a device used to load the motor which also indicates the torque. The dynamometer used in this project works on hysteresis brake principle. The dynamometer system mainly consists of three parts: Dynamometer Torque indicator Power Supply Eddy current dynamometers are the actuated braking systems. This braking system develops load torque with the interaction from the dc magnetic field produced by the windings on the stator and induced eddy currents in the rotor. When the magnetic field is added around the rotor it causes eddy currents. These eddy currents help in slowing down the speed. Dynamometer01CJC.svg The torque developed in the dynamometer is transmitted to the stator which is free to rotate over an arc and this is used to deflect a spring balance and so the torque can be directly measured on a scale. Eddy current dynamometer comes with a rotary potentiometer which works on the principle ROTARY POTENTIOMETER Rotary potentiometers come with a spiral resistive strip, and a wiper which moves axially as it rotates. As the wiper moves across the resistive strip resistance changes. VOLTAGE DIVIDER The voltage divider is used to know the output voltage when input voltage is given across the resistance. The ouput voltage depends upon the input voltage given and the resistor chosen. The resistor choosen is 10k? and an input voltage of 5v is given to the voltage divider. VOLTAGE DIVIDER The input voltage is given across the termicals 1 and 2 and the output voltage is taken across the terminals 2 and 3. Connect the voltmeter across the resistance . Now switch the output voltage off and manipulate the input voltage to 5v. Now switch on the output toggle button on . The input voltage is set to 5v. AC TACHOMETER: Tachometers are used to measure the angular speed of a rotating shaft. The speed is measured in revolutions per minute (rpm). A tachometer works on the principle that it the speed of rotating shaft is determined by the variation in output frequency signal or voltage. As the speed increases the voltage level and the frequency increases. CONTACT TYPE AC TACHOMETER The above fig shows the tachometer coupled to the motor. Ac tachometer used in the design is rated at 0.5v/100rpm. It shows that increase in speed increases. For every 100rpm variation the voltage increases by 0.5 rpm. The voltage signal from the ac tachometer is given to the simple presicion rectifier which further converts the signal to dc voltage. SIMPLE PRECISION FULL WAVE RECTIFIER A simple precision full wave rectifier converts the ac voltage to dc voltage. The simple precision full wave rectifier is built with operation amplifier which works on the principle of differential voltage. An operational amplifier is a DC-coupled high-gain electronic voltage amplifier which has differential inputs and a single output. Negative feed back controls the gain in the opamps. The output goes positive when the non inverting input(+) goes more positive than the inverting input (-) and vice versa When the input signal goes positive again, the op amps output voltage will take time to go back to zero, then to forward bias the diode and produce an output. The time taken is determined by the opamps slew rate. Slew rate is the maximum attainable range of the output voltage. Slew rate limits the highest frequency of the sin wave. The opamp 741 choosen in the project has a slew rate of 0.5v per micro seconds SIMPLE PRECISION FULL WAVE RECTIFIER The negative voltage at the input through the diode and resistor. The positive half cycles appear at the output of the second diode. When positive voltage is given the feed back is given by the diodes and hence negative cycles . The positive cycles and negative cycles are summed differentially to get the output voltage. The opamp 741 choosen in the project has a slew rate of 0.5v per micro seconds For measurement applications the signal has to be ripple free. Hence low pass filter can be used to achieve the signal free from ripples. RC LOW PASS FILTER Resistor Capacitance generally termed as RC circuits are used in filtering a signal waveform, thus changing the relative amounts of high frequency and low information in their output signals compared to their input signals. RC filter is a common application for smoothing a signal. The RC circuit has a capacitor and a resistor in which are connected in series. The charged capacitor would discharge its energy into the resistor placed in series with it. This voltage across the capacitor is found through Kirchhoffs current law which says that the current coming from capacitor is equal the current flowing out through the resistor. The linear differential eqn. can be given by ANALOG TO DIGITAL CARD Analog to Digital conversion is interfacinf the analog I/O with the Digital I/O. ADC cnversion takes place in three stages. They are Sampling, Quantisation and encoding. The ADC card which is used in the Project is CIO-DASO8/JR-A0. SAMPLING The analog input cannot be directly sent to the pc. The ADC digitises the analog input signal continusly. The proper reconstruction of signal is possible only when the sampling rate is twice the highest frequency component. If the sampling rate is under that the problem of Alaising occurs. To eleminate the problems of aliasing the signal must be sampled at a rate higher than Nyquist frequency rate. The fig shows the sampling rates and the construction of the signal. If a signal is sampled at too low rate perfect reconstruction of signal is nt possible which results in the loss of data. QUANTISATION Quantisation represents the signal in discrete and certainj voltage levels. Quantisation actually is approximating the signals to the lowest possible range. The fig below shows the sampling of a singal which is then quatises indicated by a red line. The quantization is necessary as during the sampling the small range of signals may not be digitised. This results in loss of information. By approximating the values the reconstruction of signal is perfect. CODING Coding is the process of converting the sampled signals to n bits which are represented by 0 and 1s. These bits represent certain voltage levels which is given by the resolution. SPECIFICATIONS When acquiring data to a computer, an analog to digital Conveter takes an analog signal and digitises the signal. The sigal is digitised to sertain binary numbers. These binary numbers represents respective voltage levels. Resolution refers to the number of binary levels ADC can represent a signal. The resolution of a n bit ADC can be by taking the value . The ADC card which is used in the Project is CIO-DASO8/JR-A0. DATA ACQUISITION AND CONTROL ARCHITECTURE Data acquisition and cntrol architectlog input is given to the pc via ADC which converts the analog input to digital input. The data can be transmitted bidirectionally with the help of data acquisition device. Labview Software is loaded in the pc which acquires the data with the help of built in libraraies. INSTACAL Instacal is software which manages the data acquisition hardware. It is used in calibration of the boards attached. It scans all the internal registers and the electronic equipment and if any fault found error messages are shown. The ADC is calibrated with the help of instacal to check whether the data logger is accurate or not. CHAPTER 5 LABVIEW Labview environment is opened by when new VI is selected from the start up screen. The file menu contains commands for file manipulations. Edit menu is used to modify the block diagram and front panel objects. By default the undo or redo settings for a VI are 8. It can be manipulated as per the requirement. Operate menu acts in running or stopping a VI or to change the settings of VI. The tools menu acts as interface in communicating with the data acquisition boards to build the applications and in enabling the web server. WINDOW INTRODUCTION Labview programming is mainly divided into two panels. The first one is the Front Panel and all the controls and indicators are in l