Monday, September 30, 2019

My Biggest Motivator Essay

Motivate can mean to impel or move to action. In my eyes my mom was just that. My mom worked very hard to instill values and morals in me. She also was a very independent and strong individual. Her story not only motivates me, but also inspires many others in my family. My mom instilled moral and values in me that will last a life time. She made sure we knew the difference in right and wrong at a young age. My sisters and I always knew that not only god was watching us but also she had her eye on us all the time. She always took pride in making sure each and every one of us respected ourselves as well as others. She made sure that we all would grow up a bright young lady’s, by instilling morals. Being a young lady requires one to defiantly have morals. My mother expected us to behave and follow rules at all times, even when we were frustrated at an individual, because we knew it was not tolerated. My mom is a very independent person. My mom raised 7 girls on her own, by staying true to herself and learning from her mistakes, even when times got tough she fought through. My mom worked hard her entire life. I remember times when she would walk to work and sleep on the couch so we had a good night’s rest. There were also times when my mom really struggled but she never asked for aid from a family member or government agency. I can remember my mom always taking care of her children and never giving up. My mom is a very strong person like superwomen. There were times in her life that the average person would have given up. She has given up her health for us, by putting her children first. Some of her health problems would have not been survived by the average person. She was a single mom on a factory salary by being very intelligent women. Being a motivator is never easy. My mom really made it look that way. My mom always made the best of every situation and took pride in raising her children. As I get older I strive to be half the mom she was by instilling values and morals and always being independent and strong.

Sunday, September 29, 2019

Evaluation of instructional materials Essay

Introduction As a teacher, it is your responsibility not just to teach but to guarantee that the students are learning and you must create an active and motivating learning experience for the students. The Worldwide web gives choices of wide variety of instructional resources that you could use as your teaching tool. In choosing instructional materials, the teacher must consider not just its availability or the ease of use but more on its learning outcomes. An instructional resource should meet the purpose and the objectives of the lessons and flexible to the students’ differences such as ability, interests and learning style. The objectives, the students, learning environment and the availability of the resources are some factors to consider in choosing an instructional material (Morton, 2003). Design â€Å"The content is accurate, logical and well organized, objectives are clearly defined, and the content helps to achieve the necessary objectives. † The resource should be well planned and concrete to maximize the available learning materials and to save time. The objectives should be attainable with regards to the students ‘grade level making sure that after the instructional process, learning outcomes are anticipated. It should foster critical thinking, problem-solving and decision-making (Alto). â€Å"Examples are meaningful and helpful, questions are presented clearly. † Ease of communication is important so that the students would easily grasp the information or ideas relayed by the teacher. â€Å"Important points are emphasized, the amount of information presented is comfortable and the instructional material is free of gender, race, religion or ethnicity bias. Media elements fairly represent composition of career fields in terms of gender and race. † It is also important to consider the cultural backgrounds of each student. Each student has the right for equality in learning therefore the teacher should make some adjustments to the students with different customs from the rest of the class. † Information is clear and current, facts come from reliable source which are clearly define. † Instructional technologies should be incorporated in the learning experience to enhance student understanding. Digital libraries, computational tools, virtual environments, modeling and visualization and connectivity are among the up-to-date learning process that students should be familiar of. â€Å"Content moves learners beyond the basics and encourage high level of thinking, students are engaged in applying what they learn. Lay-out is consistent. † The projects should have relevant application that the student will look forward to make after the learning process. â€Å"The Content is culturally diverse; product accommodates unique learning styles and various ability levels. Assessment methods are challenging, appropriate and suitable to learning goals. † The instructional materials should be appropriate to student differences such as interest, ability and learning style. â€Å"Teachers can easily assess students’ progress by evaluating the outcomes provided within the product, reading level is appropriate for target audience and the product is suitable for the age and grade level. † The evidence of learning should be evaluated as to determine the extent to which the goal and objectives are achieved. The development process, the reliability of implementation, the students learning as well as the teacher development should be attained. Procedures Students must make the most of his or her senses such as touch, sight, auditory, and smell in doing activities that will develop not just the intrapersonal learning but the interpersonal development as well. Interaction among students will make the learning process easier and more enjoyable and the teacher must have the means of motivating the students in order for them to finish the activity, instruction or the discussion. Clarity Readings and visual aids should be able to attract the attention and interest of the students. The teacher should have user-friendly visual aid that will further enhance the students’ imagination and thinking. Computer softwares have options for making the presentation more attractive such as colorful backgrounds, animations and sound effects that will be helpful for the students learning process. Efficiency Instructions should focus on the topic to avoid confusions to the students and maximize the time allotted for the learning process. Too much information could lead to â€Å"information overload† that the student will tend to disengage from the learning process. Instructional Material Evaluation. I chose to use the preschool program of the HighReach for they guaranteed that the programs are aligned with the states and federal standards. Moreover, they clearly stated and specified their objectives as to what learning skills they intend to develop upon the students.They also have programs that will develop not just the intrapersonal development but also the interpersonal learning. Works cited: Alto, P. Designing Learning Space Project- Designing a Preschool Highschool [Electronic Version]. Morton, D. J. B. (2003). Selecting and Using Instructional resources to Enhance Instruction [Electronic Version].

Saturday, September 28, 2019

Poverty during the French Revolution Essay

France’s history is peppered with enthusiasm of the good life. Just as the French are known for their passionate nature, so too are the events that constitute France’s socio-political history. Many of France’s great thinkers have contributed a number of concepts that are used in modern society such as the concept of property and the state. However, the country’s most notable contribution is its historical accounts of successful revolutions since it has inspired other countries to follow the same route. During the late 17th century, France’s budding economy was reaping the benefits of capitalism; the state of its people in general was not in good condition, particularly those who lived in the rural areas. This has led many of its destitute citizens to question the direction of the monarch’s rule and its intention to stay in power. As a result, people from the bourgeoisie and the urban poor had opted to go against the oppressive ruling classes in the hopes of toppling down the power and distributing it to the people, creating a balanced society. Still, after countless revolutions and reform programs, the destitute were still large in numbers, whilst the ruling classes remained to be in control of all the changes proposed during the reformation. The outcome of such revolutionized efforts in the old regime has brought into light the grounds to which extremist ideas did not seem to help the poor in France win the battle over property and human rights. The impoverished citizens in France constitute a large part of the population. In William Doyle’s book The Oxford History of the French Revolution, it was noted that 20 million people are found in the rural areas, accounting for about 90 % to 95 % of the population. About 80 % were said to have resided in villages of 2,000 or less during the reign of Louis XVI. This was due to the fact that in the past, the French society had practiced the concept of feudalism in managing the lands, dividing its citizens by three orders: the clergy, nobility and commoners. The clergy was the overseer of most of the lands though they share land entitlements with the nobility or the upper classes. The commoners were said to have been the general poor who worked for the nobles and clergy. They are not given the right to own the land as they are considered as property of their masters. This kind of stratification was already marked in birth, and is one of the triggers that fueled the French revolution since the tension created in the communities where specific privileges were bestowed upon certain individuals or groups isolated the peasant majority. At the onset of capitalism in the country, overseas trade became the forerunner that pushed the country into expanding its economy, which was set for its long-term development. Though progression has given opportunities for the poor to obtain work, especially in the urban areas, it did little to uplift the poverty rate since most often; a strict criterion was enforced that limited those who could avail the jobs in the cities. The wages were also not reasonable enough to sustain the living of most workers since the bourgeoisie class controlled most of the profits earned in their businesses and are often only circulated amongst them. In Doyle’s book, the inconsistency of the price increases in bread was said to have caused riots in the urban communities since most of the urban poor depended upon bread for their diets. This has led many of the urban workers to protest and instigate revolts against the factory owners. In effect, most of the urban poor suffered from poor health since the environment and the working conditions in which they were subjected to were not beneficial to them. After the onslaught of the bourgeoisie revolution that took over Bastilles, the peasant majority started to hope for the attainment of social inequity since they thought that most of the middle classes shared the same sentiments but they did not foresee that the change brought about by the revolution would still not favor them. In reference to Lynn Hunt’s book The French Revolution and Human Rights: A Brief Documentary History, the commencement of the French revolution gave way to the establishment of a new set of laws that was inclusive of the marginalized poor. In 1789, a National Assembly was conducted in response to the growing chaos that had swept the country’s social systems wherein it discussed injustices experienced by both the rural and urban poor. Propositions to the King were made via the Estates-General elections, which was aided by the representatives from the three different class orders to determine the distributions of the land. However, the discussion did not reach a consensus as most of them could not agree on how to vote and what is deemed to be viable for the community. The following year, a Civil Constitution for the Clergy was administered, which intended to obtain the church lands that accounted for about 10 % of whole land area of the country. This did not sit well with most of the clergy as they did not want to give up the privileges accorded to them, harboring great resentment from the peasantry. The assembly also argued about the technicalities that comprise legal rights wherein a distinction is made between active citizens, who were granted full rights to vote and hold office, and passive citizens who were under the same laws, but could not vote or hold office. While the three order division was not being considered, another form of class stratification took its place, as it determined the status of a citizen based on one’s income level, gender, race, religion, and profession. To add more insult to injury, the Le Chapelier Law of 1791 further differentiated workers from property owners. This action was said to have banned worker associations or unions from developing since the upper and middle classes thought it would be a hindrance to national unity. According to Boyle, the reluctance for distributing power to the poor communities was due to the likelihood of widespread fear of further unrest. Another reason was said to have been inclined to those who understood the aims of the enlightenment since they believe that only those who are knowledgeable could be trusted to exercise reason, or to think for themselves. Furthermore, many of those free-thinking nobilities argued that economic-based perceptions of the workers mirrored corporate guilds which would encumber individual freedom. The role that poverty has played at the beginning of the French revolution was used mostly as a tool for the bourgeoisie to control the finances of the country. The revolution was used as a means to an end, not as an end in itself, which offered the peasantry as bait in the scheme of things. While the revolution did produce a great deal of change for the state of France, the presence of the bourgeoisie and the stance of the few privileged has contributed to the stagnation of what the revolution could have been.

Friday, September 27, 2019

Critical Thinking 2 Speech or Presentation Example | Topics and Well Written Essays - 1000 words

Critical Thinking 2 - Speech or Presentation Example All the sectors are related and affect each other. a) For each unit change of an independent variable, the change in the quantity of Chevys sold or demanded is equivalent to the coefficient of the variable. Therefore; a unitary change in the following independent variables will cause a corresponding change in quantity demanded by; The increase in the price of tickets resulted into increased profits in the short-run. However, in the long-run, profits declined owing to the fact that in the long-run, the customer is not willing to purchase the ticket at an increased price. a) These goods conform to the law of demand. This is because the law of demand states that an increase in the price of a commodity would lead to decrease in its demand as consumers would be less willing to purchase the commodity at a higher price, thus leading to a negative price elasticity of demand. On the other hand, an increase in consumer’s income would lead to an increase in demand of the commodity as consumers are able to consume more of the commodity, thus leading to a positive income elasticity of

Thursday, September 26, 2019

Partial Birth Abortion Research Paper Example | Topics and Well Written Essays - 1250 words

Partial Birth Abortion - Research Paper Example This paper is a critical examination of partial birth abortion focusing on how the procedure is conducted and comparing it with other types of abortion. According to Cathy, partial birth abortion involves terminating a pregnancy without removal of all products of conception (3). One of the major differences between the process and other types of abortion is that the fetus is partially born and alive before it is killed. The procedure of partial birth abortion is delicate and is normally conducted by skilled medical personnel. Partial birth abortion has been practiced for a long time especially in the United States. Cathy notes that the practice came into public attention after a medical doctor admitted to having undertaken the procedure on a routine basis in his practice in 1992(88). The doctor’s admission of the practice elicited intense debates, from both pro-abortion groups and pro-life after the details about the procedure were made public (87-92). Before partial-birth abortion was made illegal, proponents of the practice argued that it was a rare practice, conducted under extreme conditions especially during emergencies when the life of the unborn child and/or the mother is under threat (Alcorn, 72). However, in-depth investigations into the prevalence of the practice in the American medical institutions revealed that the practice was indeed common. According to Reagan, partial birth abortion was regularly undertaken on healthy pregnant women with robust unborn fetuses aged 20 weeks and over (60). Proponents of partial birth abortion also contend that the practice is an important component of the â€Å"virtue of choice†, which allows all people including pregnant women the right to determine what to do with their lives (Cathy, 92). In spite of the practice being illegal, it is still widely practiced across the country. Moreover, research studies indicate that women who terminate their pregnancies have higher risks of de veloping mental problems in the future (Alcorn, 209).

What drives Willie Loman and sons Seeing the world through the Coursework

What drives Willie Loman and sons Seeing the world through the protagonists eyes - Coursework Example Biff considered his family and himself to be the ordinary people, which are not able to achieve the unreal dreams. Both brothers (Biff and Holly) are shown as the people, who do not wait anything special from life, though they possess different characters, as Happy is not involved greatly in the moral principles. The brothers have totally different inner worlds. The death of Willy did not change anything in the mind of his son Holly, he decided to follow his father’s steps and continue to live in the same way, making the same mistakes, while Biff saw the kind of fatuity in the death of his father. He sees it as useless as his own life and decides to live differently. The readers can understand it, when Biff says: â€Å"He had the wrong dreams. All, all, wrong!† (). Biff finds out, that during the useless rush for the unreachable dream, his father lost thousands of happy moments of the regular every day life. The theme of the play touches the questions of human self-know ledge and its importance for the life of the individual. The relationships of Biff and his father were never perfect. Biff saw his father as an example until he got disappointed in his actions and behavior. Without any idea of who he was, he tried to live the same life as his father and understood that it was the wrong one, after the numerous troubles and sorrows. He learned the sense of life through his own mistakes, though at the end of the story we cannot say that he found himself. The motivation of the play’s characters is revealed through their reaction on different events. The reaction of Holly on his father’s death gives him strength to continue his path and to show everyone that it was not in vain. Linda seeks freedom as the mean of escaping from numerous debts and achieve stability. The play possesses a deep philosophical context. The idea of â€Å"American Dream† remains the most wanted and needed among the people. The

Wednesday, September 25, 2019

Interview Essay Example | Topics and Well Written Essays - 1250 words - 7

Interview - Essay Example The other similarity in the cultures of both countries is the mish-mash cultural diversity, where American culture comprises of cultural practices from different nationalities and ethnic groups, since America is an immigrant country, while the Kenyan culture comprises of a mixture of tribal cultures and cultures from different nationalities too. Nevertheless, while the American language culture is characterized by English as the predominant language, the Kenyan language culture is multilingual, comprising of 42 different spoken languages, in addition to English and Swahili which are the official Kenyan languages. The youth culture is another notable area that both the USA and Kenya shares a similarity. Despite the fact that Kenya is by way, too far to develop its economy to the level of the American economy, the advancement in education and technology in Kenya has been great especially in the last two decades. Consequently, the youths in Kenya are able to access the social media and other globally interactive platforms where the people share information and cultures internationally. As a result, the Kenyan youths have adapted a high percentage of the western culture, and most especially the American culture, such that the American youths are likely to feel at home while in Kenya. However, there are many aspects in which the culture of the USA and that of Kenya vary. Firstly, the family culture in the USA and in Kenya are very different, considering the fact that in USA, the family unit is basically the nuclear family, with the extended family not often living together. On the other hand, the Kenyan culture comprises of the extended family living together in the same homestead. Additionally, the family cultures in both countries vary in size, with the size of the nuclear family in Kenya being relatively bigger than that in the USA, having on average 2-4 children and 4-7 children respectively.

Tuesday, September 24, 2019

PETROLEUM POLLUTION IN INTERNATIONAL WATERS -(THE ROLE OF Literature review

PETROLEUM POLLUTION IN INTERNATIONAL WATERS -(THE ROLE OF INTERNATIONAL LAW AND TREATIES) - Literature review Example To achieve this end, reviewer will concisely and critically discuss the literature’s structure, contents and evaluate if international laws are appreciated in resolving petroleum pollution cases in high seas. Content: Preventing Oil Spill thru Standards Authors of this literature are Nicholas P. Chereminisinoff and Paul Rosenfeld. They are chemical engineer and environmental chemist respectively with expertise on environmental pollution prevention and ecological restoration programs. Chereminisinoff and Rosenfeld aimed to share high impact contribution on pollution control processes by probing into petroleum industry to document best management practices and models, cleaner production of technologies and pollution prevention practices. This is clearly depicted in the title of the journal Pollution Prevention and Cleaner Industry: Best Practices in Petroleum Industry. Structurally, the literatures have no Abstract section but concise topic and themes where explicated in the Pre face Section. Authors detailed prevention of oil spill in six chapters, all of which had separate introduction, body and conclusion. Each chapter has proper author referencing to corroborate studies and they prescribed other references for further reading too. The document is sufficient of originality for journals, logically concluded with illustration and can be summarized without sacrifice to content. Authors indicated in introduction their serious concern on petroleum pollution in both land, air and high seas citing impact to industries, corporation and vessel owners that are supposedly boxed by policies on standard quality control (applied to oil extraction industry), corporation laws, maritime laws, insurance and environmental policies. Petroleum pollution’s devastating impact to ecosystem were all pointed in the introduction citing issues on protection, compliance to regulations, toxic management, performance audit, and the like. Thus, authors at the outset asserted tha t corporations engaged in the extraction and distribution of petroleum across continents should have transparent Environmental Aspects in accordance to internationally ISO standards for standard quality control to prevent disasters and environmental destructions. They urged corporate entities to strictly adhere to regulations by exercising strategic corporate planning, standard operational system, environmental protection standards, risk management, regular performance appraisal and thorough environmental impact assessments. As hypothetical assertion, they argued that corporation should not just generate revenue but must include pollution prevention for cost –efficiency, especially that oil extraction and distribution is a capital intensive venture. Authors manifested that they disfavored extractive industry’s productivity at the expense of environment and public safety. On methodology, authors did not expressly stated how data collection was done but their handbook cl early depicted the use of mixed qualitative and quantitative research studies that absorbed empirical facts which covered (a) comprehensive narration about petroleum industry, quality standards required in its facilities and operations and about quality

Monday, September 23, 2019

Are viruses alive Essay Example | Topics and Well Written Essays - 1750 words

Are viruses alive - Essay Example Viruses are microscopic agents that survive only in the nucleus of cells of other living organisms. This implies that viruses live in any living thing both plants and animals. They replicate inside the cells and, in some advanced cases, they feed on the nucleus of the cells thus resulting in the death of the cells. Viruses have unspecified structure of deoxyribonucleic acid commonly referred to as the DNA (Dilcher, 2000). The DNA defines the structure of cells, the fact that viruses have indefinite DNAs makes them capable of changing their structure from time to time thus making it difficult for the body cells to identify and remove them from the cell structures. Among the most notorious virus is the Human Immunodeficiency virus that causes the Acquired Immune Deficiency Syndrome, AIDS (Nelson, 2010). This research article therefore employs an effective analysis of this single virus to describe the features of other viruses by extension. The structure of a virus A virus is an organis m with a simple structure, this is arguably the smallest organism on earth and due to its small size, the organism cannot survive on its own, it thus requires the cell of a host organism to thrive. Viruses have the simplest structures composed of only three components. These are the nucleic acid, the protein coat and the lipid membrane. The nucleic acid is the most essential part of the virus; it contains the deoxyribonucleic and the ribonucleic acids. The two acids define the virus; they contain all the necessary information for the virus to define its unique indefinite structure and to make it multiply (Theodora, Guoying & Dimitris, 2002). The nucleic acid is lightly dispensed in surrounding plasma all of which are enclosed in a protein coat. This is a light layer of pure protein elements that protects the components of the virus. The protein layer defines the virus. However, being purely protein, the coat lacks definite shape to constitute the definite structure of a virus. The s oft coat is highly permeable allowing free movement of molecules in and out of the virus. The structure of the protein further changes according to the protein composition of the host cell, this enables the virus to vary its acidity and alkalinity levels to suit that of the host cell thus permit its survival. Besides the two components of a virus is the lipid membrane. This is a layer found after the protein membrane. However most viruses lack this layer and survive only with the protein layer as the most outside coat. Viruses that lack this final outer coat are generally referred to as naked cells. The lipid membrane performs the edge formation function thus defining the virus. It also lacks such strong elements as keratin and lipid and therefore aids in the indefinite structures of viruses. Virus infection process Unlike other living organisms, a virus cannot survive on its own; viruses have no chemical composition to exist without the assistance of a host cell. Host cells on whic h a virus mounts itself is referred to as a receptor (Agalioti & Prekh, 2001). Viruses choose their receptor carefully taking into consideration the information in the viruse’s deoxyribonucleic and ribonucleic acid this implies that every virus has its specific receptor. Once a virus gains entry into the body of a living organism, they attach themselves to their respective receptor cells from where they thrive through the rigorous replication process (Dilcher, 2000). The flu causing virus shows preference for the mucus coating cells found in the lungs and other airwaves in the body. The HI Virus on the other hand shows indiscriminate preference to white blood cells in the body of a living organism. Since viruses cannot survive alone, they do not therefore freely exist in the environment but are carried in the body cells of other previously infected organisms. They thus transfer from these organisms to the other through contact of the bodies that possibly results in the exposu re of the body cells of the second victim.

Sunday, September 22, 2019

High school education Essay Example for Free

High school education Essay We can all say education is a big requisite in life, but do we really spend the appropriate time to it? . We sure not†¦, at least I didn’t for a couple of years. Freshman year on high school could be hat year you would never forget. Becomes a new life style, met new people, new hobbies, and new interests. Basically turns out to your biggest change in life. My high school education could of say it was more fun and adventurous than those kids who actually are focus to graduate with a high GPA, get an efficient scholarship, and attend to a reputable university. I started out my freshman year good. I was attending to class, participating and doing class work, I was doing homework. I had no problems, then after my freshman year was over I had many friends that I was expected. Then I got to meet my true friends which I still hang out and do crazy stuff. My sophomore and junior year I went out of control laterally. I never was in school, just to go get my free lunch because, who didn’t liked to be in lunch? Right. To be clearer, anywhere was a better place than school. Yeah I had so much fun, memories than I would never forget, unexpected trips, water balloons fights, ride horsing, and four wheeling, ditching parties, even run away from cops. But like how it needed to happened, it happened. My slacking in grades would be known eventually by my mom. There’s one thing that I’ll be always glad for, I have the most overprotective mom in the world. Her reaction was immediately that the next day she knew about I was not going to school, she was there talking to the principle asking him to make a stop of it. All the trouble that I was into, and all the talks my mom and I had, it made my mind expand to reality and to convince myself that I was not doing good in school and that would affect my future. I catch up my senior year picking up my GPA and grades to proudly get thehigh school education and be able to register at CNM. College is a different level than high school by too much. Here you cannot take the risk to slack not even a little. If you slack not showing up, or not turning homework, grades are really affected. College has help me to raise myself as an adult and take proprieties first. That you are who build your future, that hard work always pays off. I’m thankful to attend to college.

Saturday, September 21, 2019

Psychology And Its Branches Sociology Essay

Psychology And Its Branches Sociology Essay First of all psychology is the study of human behaviour. The sole purpose of psychology is to unravel the mystery of why and individual acts a certain way. Psychology examines an individuals specific actions, responses and factors that dictate how an individual reacts under set conditions and the environment. The behaviour of an individual has an impact on the greater society that surrounds the individual. Psychological theories cover many branches including organizational psychology, environmental psychology, development psychology, forensic psychology and sports psychology. The talk about psychology and its branches bring up an individual in particular, Robert William Pickton. This former pig farmer and serial killer convicted of the second degree murders of six Canadian women in 2007. He was also charged with the murder of twenty additional women. The Canadian man born in British Columbia is considered a psychopath and is very easily determined as one because of his childhood. The branch of psychology that specifically affected Picktons mentality was his development as a child and the environment he grew up in, in other words development psychology. Robert Pickton grew up in a childhood filled with denial from his mother. Due to Roberts mother heavy work regime he would never have fun, spend time with friends or time to play. If Robert was not in school, he would be found in the slaughterhouse where his environment affected his mentality. In such an environment it is easy to see the development psychology theory that has had a major effect on Picktons psychopath killing spree up to a total of forty-nine victims. Erik Erikson believes that human behaviour can be understood through the experiences an individual encounters during their development. This directly relates to Robert Pickton because of the violent and gruesome environment Pickton grew up in, it is easy to analyze why his psychological behaviour has become what it is today. Erikson suggests that a person may pass a stage of psychological development or they get stuck. For example, an infant either trusts his/her caregivers or s/he doesnt. This failure of trust gain can affect the persons trusting relationship later on in life. This same ideology goes for Pickton; he grew up in an environment where killing was occurring periodically in a day. This harsh and violent environment has caused Pickton to have a violent and gruesome psychological personality. He believes that killing has no evil or wrong in it, this is because of the psychological development theory. Pickton has been stuck in this psychological environment since his childho od and has been prominent in his life. Sociology Perspective: Sociology is a social science perspective that states one area of society will always have an effect; it can be either direct or indirect. This is due to society being a complex structure where there will always be modifications and changes in it due to society itself. The ideology of society influences decisions made on marriage, economics, love, freedom, politics etc. However, recognizing these facets of life does not assist with the explanation of their existence. In other words, sociology is the study of the development, structure, and functioning of human society this can include social problems within society. Robert William Pickton had a criminal mind set because of his childhood as explained through psychological development. Through his childhood and Picktons brutal treatment as a child from his mother, Pickton grew intolerance for the opposite sex. He felt that males are dominant over females and thus the feminist theory of female oppression. Through the sociological feminist perspective Pickton neglected the female figure. His behaviour as a serial killer towards women was triggered through his childhood and ever since he has developed a feminist social view where he believes males are the dominant gender over females. Hostile affection from Picktons mother led to an angrier individual later on towards the opposite sex and thus the criminal acts released against women in Picktons elder years. The sociological analysis of Marxist Feminism Theory also plays a role in the behaviour of Robert William Pickton. This implies the lack of balance in society in terms of gender classes in the economic perspective of sociology. Stereotypes within society influenced Pickton as he believed women have a lesser role in society than males. This is why Pickton would go for vulnerable areas for kidnapping and base his attacks on lower class levels. For example, Robert Pickton would target women that were prostitutes or drug addicts because there class level in society was lower than his. Picktons targeting specific groups of women instead of the women gender as a whole illustrated sociological perspective of feminism. Pickton tried to achieve structural functionalism in society where there is a balance, equilibrium in society by maintaining its interdependent social structures. Talcott Parsons stated, as much as things change they stay the same. Structural Functionalism deals with the maintenance within a society; it defines changes within a system and will always seek a way to return to its normal functioning state. As Parsons stated, Pickton followed this social theory as he thought he was bringing balance to society by eliminating the lower class of females. Parsons also mentioned, When part of the system breaks down, it is necessary for the other components of the society to take over the function of the missing social structure or to assist with the recreation of the malfunctioning social structure. This supports Picktons choice in achieving structural functionalism by the removal of the lower class which consisted of females. Anthropology Perspective: Anthropology is the social science perspective of studying people and their culture. Anthropology exists to explore a variety of social phenomena. A benefit associated with anthropology is that its research lies in the huge perspective on the development and sustainability of human culture. This social science perspective poses questions concerning the continuation of poverty, racism, violence and social inequality in the world. There are four main types of anthropology; including linguistic anthropology, cultural anthropology, archaeology, and biological or physical anthropology. Each type studies different aspects of people and their respective cultures including questions such as; why do humans have such different ways of thinking, living and acting? This is the social science perspective of anthropology. Robert Picktons social interactions and relationships were not fully established. Pickton lived his life in rejection; he was rejected of all social interactions which later led to his rage and intolerance against women. Picktons childhood was lived in neglect and the omitting of social interactions with other kids his age. The entire cause for this rejection was because of his mother, a female figure who was very brutal and hostile to the young Robert Pickton. This inevitably led to anger being stored throughout Picktons life towards women and thus the targeted attacking of women by Pickton. Pickton thought of his values and morals over others, specifically prostitutes (again targeting women). Pickton already thought of women as poor and inferior to males, now including prostitution he believed that those women did not deserve to live amongst society and him. Robert believed that to earn a living an individual should go through pain and hardship but prostitution in his perspective c learly did not show that. He believed prostitution made an earning with pleasure in life and not pain; he believed that individuals should earn a living from physical labour and pain. Robert would never feel any sympathy for women especially prostitutes, thus his guilt-free attitude in killing these specified group of women. Robert King Merton bases his interpretation of society using the functionalist perspective. Functionalism is a method for understanding how social institutions fill social needs.  Every custom or practice in society provides a form of stability for the entire system. This seems like a grand theory but social institutions provide for the physical and psychological needs for its society members.  Sex is a practice of functionalism as it is a physical and psychological need for humans. Pickton was a very shy and quiet individual but he acquired sex because it stored up inside of him. Pickton would host wild parties and orgies to release his chaotic thoughts. This also explains why Pickton would have sex with the women he would kidnap and then kill her, it is a practice of Picktons functionalism and this describes the social science perspective of anthropology. Hypothesis: Psychoanalysis, Functionalism and Feminism Psychoanalysis is a psychological theory founded in the late 19th century and early 20th century by Austrian neurologist Sigmund Freud. In involves the inherited constitution of personality which is an individuals development determined by events in their childhood. Cognition, human behaviour and experience are largely determined by irrational drives. Mental disturbances from psychology occur when there are conflicts between conscious and unconscious material. Functionalisms core idea is that mental states are constituted solely by their functional role. It is a theoretical level between physical implementation and behavioural output. Functionalism is a method for understanding how social institutions fill social needs. Every custom or practice in society provides a form of stability for the entire system. This seems like a grand theory but social institutions provide for the physical and psychological needs for its society members. Feminism examines the perspective of women and their rights within a society, specifically a male dominated society. To understand and comprehend a serial killer as to what his/her motives are it is important to instigate an investigation. Through this investigation it is important to determine the unconscious and conscious mind of the serial killer by taking a look at their ego. This investigation will determine the drive of the serial killer as to what they wish to achieve, what pleasure they wish to achieve etc. Functionalists regard crime as a necessary guideline in society because it sets moral guidelines and rules through legal punishment. An increase in criminal behaviour loses the societys trust whereas a decrease in criminal behaviour illustrates that individuals have no freedom or individuality. When determining a serial killer it is important to gain information of the insights of the psychoanalytic, feminist and functionalist perspectives. These three perspectives combined can determine and give a thorough understanding of a serial killers ambition, pleasure and the ego of the criminal.

Friday, September 20, 2019

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