Environmental Studies, Ethics Essay Example | Topics and Well Written Essays - 750 words

Environmental Studies, Ethics - Essay Example Large-scale farming is more complicated than large-scale industry. Also, the growth pace is very slow. To Karl Marx, capitalism meant a progressive historical stage that would eventually freeze because of internal contradictions, and in the end, making way for socialism. This ideology provides the base for Marxist theory on the impact of capitalism and mechanization on farmers, the transition from peasant-based agriculture towards an agricultural-industrial revolution. The need for revolution was inevitable. The conventional means of agriculture just could not feed the mouths of billions of people. The impact of this revolution cannot be categorized as either good or bad in absolute terms. The peasant domestic industry was the backbone to the system providing protection for laborers. But with the transition this industry vanished and with it the traditional peasant culture. For the same reason, people started to see the benefit of having a small family, which meant fewer mouths to feed in the winters. The need for more money was the primary driving force. Marxs idea about agricultural revolution is defined within the comparison of large-scale farming versus small-scale agriculture. The assumption here is that the rural population will be segmented into strictly defined social classes; a small minority of wealthy farmers living alongside the majority of agricultural workers. This relationship would not be based on equality because the workers would have been always trying to free themselves from the oppression and influence of the authority. Marx proposed the success of transition but suggested that an alliance of industrial and agricultural working class was imperative for the healthy growth of the society. Ultimately, this union could become a force against the capitalists. Kautsky does not limit himself to a narrow debate. Only considering the

Debate on Indian Removal Essay Example for Free

Debate on Indian Removal Essay In the contemporary world the idea of removal of an entire people from its native land would sound wickedly and would perhaps be considered a genocide, yet in the XIX century this idea was quite permissible and corresponded to the ruling concept of civilized nations which were to rule those uncivilized and determine their existence. Therefore, in our estimation of pro and contra Indian removal arguments I shall attempt to evaluate the named arguments first and foremost from the point of view of the time and base my conclusions on such evaluation. The first argument proposed by Andrew Jackson to the Congress in 1829 is that that no new state may be established without consent of the people of that state, and since Indians are living on the territory of existing states and do not constitute a majority, they may not establish their own government and have to obey the laws of the state or immigrate. A harsher version of the argument is provided in the North American Review, January 1830, blaming that Indians are barbarous people â€Å"incapable of sustaining any other relation with the whites, than that of dependence and pupilage. † Francis J. Grund is even more acrid, as he claims Indian’s cruelty towards the Founding Fathers. A counterargument can be found in the Memorial of the Cherokee Indians, published in the Weekly Register vol. 38, and it is that a white man is a ruler of the land, and the red man is weak, yet there were times when whites were week and reds were strong, and the whites received warm welcome from the Indians. Also the Indians argued that previous treaties guaranteed their rights to land. The situation with the Indians is similar to the one with the colonists before the Revolution. The colonists appeared to be weak and Britain was strong, yet the colonists were able to gain their independence by force. However, the Indians were unable to win the war and they had to obey those who are strong. Therefore, the US Government argument was nothing but a sword law, not a just law. This is well confirmed by the Decision of the U. S. Supreme Court in Worcester v. State of Georgia (1832), where the Court has found that treaties between the Indians and the Government, as well as Indian self-government are guaranteed as long as the Indians obey the general laws of the state. Since the Indians did not obey, all they privileges have to be annulled. Yet the laws of the state themselves made the Indians chose between â€Å"becoming civilized† in other words not leading their traditional lifestyle and immigration. So, it may be concluded, that removal has logically followed from the previous relations between the Indians and the Government, in which the Government used sword more frequently than justice. The second pro argument proposed by Andrew Jackson in 1830 were advantages of immigration both for the whites and for Indians. For the US government is was an opportunity to protect the frontiers, for the states of Mississippi and Alabama these were new territories and opportunities for development, and for the Indians, under Jackson, it was an ability not to have contacts with the civilized people, follow their customs and live under the government supervision, gradually becoming a civilized community. A counterargument of the Indians is explained in the mentioned Memorial, as well as in the article published in the North American Review, October 1830 where they claim their right to stay on their land and continue their traditional life same as any nation has title over its land. In fact, we once more face the sword law: the Government determined what is â€Å"civilized† and what is â€Å"law† and the Indians had to obey or disappear. Another Indian argument may be found in the letter from John Ross: the Government was just willing to get rid of the Indians. This is an argument with no counterargument. Government’s desire to make away with the Indians was undisputable. Concluding my analysis I have to recognize that the arguments of the Indians look stronger even for the XIX century. An independent international tribunal of the time would perhaps take their side. Yet there was no such tribunal, but only the will of the Government which caused Indians to be removed.

American Identity Essay -- History Indians Historical Essays

American Identity Works Cited Not Included American identity has been created by many events throughout the course of history. This country was founded on the clashing and mixing of many different cultures and lifestyles. One of the most important periods of time for this country was during the period of conflict between Americans and Native Americans over land rights. Americans had an idea of manifest destiny and that this land was theirs for the taking. The Americans were going to walk through anyone who opposed them in this quest for land. The treatment of the Indians during this time period was harsh, cruel, and violent to say the least. It is in this treatment that Americans came to view the Indians as a ?racialized other? and where race began to matter. This early thinking is what created our American identity which is based on race.   Ã‚  Ã‚  Ã‚  Ã‚  In the early settling of this country, when the English first encountered the Indians they viewed them as uncivilized beasts. ?The first English colonizers in the New World found that the Indians reminded them of the Irish? (Takaki, 28). To the English the Irish represented a lower and uncivilized class of people, a group that the English considered to be beneath them. This association was the beginning of creating an ?Indian Race.? The Indians were different then Irish in they had a reddish tint to their skin. This was important because this lead further to their separation by their color. The Indians were further looked at as...

Teenage Smoking :: Cigarette Smoking

Teenage Smoking: Teenagers Should Not Smoke   Ã‚  Ã‚  Ã‚  Ã‚  Teenagers should not smoke because smoking is the most preventable cause of death in America today, especially among teenage smokers. Cigarette smoking is the major cause of lung cancer. It is also responsible for chronic bronchitis. Last, there is emphysema, which is another disease caused by smoking. By smoking, people have a fivefold increase in the risk of dying from lung cancer, chronic bronchitis, and emphysema.   Ã‚  Ã‚  Ã‚  Ã‚  Lung cancer accounts for 29 percent of all cancer deaths in the United States and smoking accounts for about 87 percent of lung cancer deaths. The risks of dying from lung cancer are 23 times higher for male smokers and 11 times higher for female smokers than for nonsmokers. An estimated 158,700 people - 94,400 men and 64,300 women- die from this disease each year, which makes lung cancer the leading cause of cancer deaths in both sexes. The great majority of lung cancer cases could be prevented and thousands of lives could be saved each year if people would quit smoking.   Ã‚  Ã‚  Ã‚  Ã‚  Smoking is the main cause of chronic bronchitis and has been found to cause acute bronchitis. Acute bronchitis affects the branches of the bronchi and may develop into bronchial asthma or lobular pneumonia. Chronic bronchitis, a serious and incurable disorder, may result from repeated attacks of acute bronchitis. It is characterized by fever, chest pain, severe coughing, and often secretion of sputum (mucous material coughed up from the respiratory tract).   Ã‚  Ã‚  Ã‚  Ã‚  Emphysema is a progressive respiratory disease characterized by coughing and shortness of breath, which can develop into extreme difficulty in breathing, and most of the time resulting in disability and death. In recent years, emphysema has become a very serious public health problem in terms of rapidly increasing numbers of disabilities and deaths. The highest degree of occurrence is among heavy cigarette smokers, especially those exposed to polluted air. Although people can not quite cure emphysema, abstention from smoking is essential, because it can give relief and increase functioning capacity.

Rizal and the World at the Time

Jose Mercado â€Å"Rizal† lived in a time that had quite the background. Globally, slaves were getting freed, powers were rising, powers were declining. Locally, it was more oppression and religious brainwashing than progression. How could these events influence Rizal? Of course, being an individual of high intellect, how could he not? You have to imagine what Rizal could see and learn around him at that time. He was one of the few who were that of a well-to-do family.This meant that he could attend school and receive education. He read books when he wanted, he learned history and philosophy, and many others that when combined with a brilliant mind, could see things more objectively without being clouded by passion. If he could take an objective stand on situations and yet as reflected in his works, be passionate about them, then that means that his passion is backed up by something objective. The whole world was entering a time that respected the rights of the human being.Sla ves were being freed and because of this, a lot of human rights laws were being made. At the same time, the world’s powers were expanding and decreasing at the same time. Locally, news of oppression spread. These things give you a good idea why Rizal took his stand against the rebellion as he did. The oppression around him was definitely not acceptable in the eyes of Rizal because human rights were being spread around the world by the intellectuals of North America and backed up by the actions of Russia.But Rizal knew that the Philippines definitely cannot hold itself as a country yet. He’s a smart guy and with that he probably looked up the history of war and what was needed to have strength as a country. If one were to look at the circumstances of the country with just the country in your sights, you would have taken the route of a Katipunero and decided to wage war against the oppressors. Rizal didn’t. Why?This is because he had the circumstances of the whole world to back up his ideals. He was influenced by the events globally and not just locally. He was an intellectual who was influenced by the works during and before his time. He thought of the welfare of the country in the long run and not just the shortest way out. It’s too bad he had to die as he did. He definitely would have come up with a revolution that would have put the Philippines in a better state than it is now.

Free Essays on Praise Of Folly

The Praise of Folly Before we talk about Desiderius Erasmus and his writing The Praise of Folly, it must be discussed on how the Renaissance came into play and affected the various people including Erasmus. The Renaissance was basically a blending of Classical themes with Christian themes. Erasmus and many others at the time such as Sir Thomas Moore were humanists. Humanists at the time were the drive of the Renaissance. They believed in the realism of an individual and the natural capacities of the self. There were many different kinds of Humanists such as French Humanists, Spanish, and English and Northern European Humanists which Erasmus was a part of. Most dealt with religion and the Christian faith. This new time with a mixed way to look the world, people were able to express how they felt about certain aspects of the political, economical, and social order for the time. Such people as Erasmus made the humanism movement wide-spread and not just a local movement but into an international wa y of thinking. Erasmus and his colleges challenged the very ideas of the Christian hierarchy to the secular princes and rulers of Europe at that time. These ideas made Erasmus and some others stand out from the other humanists at the time. One topic that must be discussed is the idea that Erasmus was very different then most other humanists. At the time, there were many idealists who wanted to change the way the Roman Catholic Church worked. These people such as Luther wanted a reformation in the religious doctrine and practice of the religion. This is why Luther left the church and went his own way. Erasmus on the other hand, was different in a sense that he was more for moral reform in the church and did not leave the church like the others. One moral reform he talks about in The Praise of Folly was that of how the church leaders should care more about their religion and their â€Å"flock† then lining their pockets full... Free Essays on Praise Of Folly Free Essays on Praise Of Folly The Praise of Folly Before we talk about Desiderius Erasmus and his writing The Praise of Folly, it must be discussed on how the Renaissance came into play and affected the various people including Erasmus. The Renaissance was basically a blending of Classical themes with Christian themes. Erasmus and many others at the time such as Sir Thomas Moore were humanists. Humanists at the time were the drive of the Renaissance. They believed in the realism of an individual and the natural capacities of the self. There were many different kinds of Humanists such as French Humanists, Spanish, and English and Northern European Humanists which Erasmus was a part of. Most dealt with religion and the Christian faith. This new time with a mixed way to look the world, people were able to express how they felt about certain aspects of the political, economical, and social order for the time. Such people as Erasmus made the humanism movement wide-spread and not just a local movement but into an international wa y of thinking. Erasmus and his colleges challenged the very ideas of the Christian hierarchy to the secular princes and rulers of Europe at that time. These ideas made Erasmus and some others stand out from the other humanists at the time. One topic that must be discussed is the idea that Erasmus was very different then most other humanists. At the time, there were many idealists who wanted to change the way the Roman Catholic Church worked. These people such as Luther wanted a reformation in the religious doctrine and practice of the religion. This is why Luther left the church and went his own way. Erasmus on the other hand, was different in a sense that he was more for moral reform in the church and did not leave the church like the others. One moral reform he talks about in The Praise of Folly was that of how the church leaders should care more about their religion and their â€Å"flock† then lining their pockets full...

Overview of Autism essays

Overview of Autism essays Detected in approximately four to five of every ten thousand births (Powers 10), autism is a widely misunderstood disease. General knowledge of autism, often mistaken, is derived from films such as "Rainman." These unrealistic films feature autistic characters who are portrayed as being excessively intelligent. In reality, however, only twenty percent of people diagnosed with autism have average or above-average intelligence (Autism Primer 2). Actually, the majority of autistic people suffer varying degrees of mental retardation. A lifelong developmental disability, autism is a disease which affects the way people see, hear, relate, and communicate to others around them. Although the disease is incurable, progressive steps can be taken to help an autistic person function more independently in society. Autism is categorized as part of a larger group of disabilities called Pervasive Developmental Disorders, or PDDs. Among other PDDs, such as Down syndrome and schizophrenia, autism rates as the fourth most common (Powers 10). General symptoms of PDDs include impaired social interaction and communication skills. Symptoms, however, range on a continuum from mild to severe. While mild behavior is in no way dangerous, severe behavior can be very aggressive and can even result in self-injury. No single factor has been determined as a cause for autism, but researchers have come up with several theories. One probable cause is an abnormality in gene structure, which is acquired genetically. These genetic conditions affect brain development. Another possibility is that autism is the result of a diet lacking some vitamins, minerals, and amino acids. Both of these hypotheses can contribute to neurological abnormalities. The affected areas of the brain include the cerebellum, hippocampus, an d amygdala. The neurons in this part of the brain develop to be smaller than normal, and the nerve fibers are stunted. Two other theori...

The Modern Chinese Wedding Ceremony and Banquet

The Modern Chinese Wedding Ceremony and Banquet In modern China, the official marriage ceremony is  now substantially different than it was in traditional Chinese custom, where most marriages were arranged according to a social arrangement and were heavily influenced by the philosophy and practices of Confucianism- at least for the majority of Han Chinese. Other ethnic groups traditionally had different customs. These traditional customs were a carry-over from feudal times in China but were changed by two different reforms after the Communist revolution.  Thus, the official act of marriage in modern China is a secular ceremony, not a religious one. However, there remain strong traditional customs in place in many parts of China.   The first reform came with the 1950 marriage law, the first official marriage document for the Peoples Republic of China, in which the feudal nature of traditional marriage was officially eliminated. Another reform came in 1980, at which time individuals were allowed to select their own marriage partners. In an effort to control population numbers, Chinese law today requires men to be at least 22 years of age and women 20 years of age before they can legally marry. It should be noted that while official policy outlaws all the feudal customs, in practice of arranging marriage does persist in many families. Chinese law does not recognize yet recognize same-sex marriage rights. Since 1984 homosexuality is no longer considered a crime, but there is still substantial social disapproval of same-sex relationships. Modern Chinese Wedding Ceremonies Although the official modern Chinese wedding ceremony usually takes place in a city hall office presided over by a government official, the genuine celebration generally occurs later at a private wedding banquet reception that is usually hosted and paid for by the grooms family.  Religious Chinese may also opt to exchange vows at a religious ceremony, but either way, it is at the later banquet reception that the larger celebration occurs, attended by friends and extended family.   The Chinese Wedding Banquet The wedding banquet is a lavish affair lasting two or more hours. Invited guests sign their names in a wedding book or on a large scroll and present their red envelopes to attendants at the entrance of the wedding hall. The envelope is opened and the money is counted while the guest looks on. The guests’ names and amounts of money given are recorded so that the bride and groom know how much each guest gave toward the wedding. This record is helpful for when the couple later attends this guests own wedding- they are expected to offer a gift of more money than they themselves received.   After presenting the red envelope, guests are ushered into a large banquet hall. Guests are sometimes assigned seats but are sometimes welcome to sit where they choose.  Once all the guests have arrived, the wedding party begins. Nearly all Chinese banquets feature an emcee or master of ceremonies who announces the arrival of the bride and groom. The couple’s entrance marks the beginning of the wedding celebration. After one member of the  couple, usually the groom gives a short welcome speech, guests are served the first of nine meal courses. Throughout the meal, the bride and groom enter and re-enter the banquet hall, each time wearing different clothing outfits. While the guests eat, the bride and groom are typically busy changing their clothes and attending to their guests’ needs. The couple typically re-enters the dining hall after the third and sixth courses. Toward the end of the meal but before dessert is served, the bride and groom toast the guests. The groom’s best friend may also offer up a toast. The bride and groom make their way to each table where the guests stand and simultaneously toast the happy couple. Once the bride and groom have visited each table, they exit the hall while dessert is served. Once dessert is served, the wedding celebration  promptly ends. Before leaving, guests line up to greet the bride and groom and their families standing outside the hall in a receiving line. Each guest has a photo taken with the couple and may be offered sweets by the bride. Post-Wedding Rituals After the wedding banquet, close friends and relatives go to the bridal chamber and play tricks on the newlyweds as a way to extend good wishes. The couple then shares a glass of wine and teach traditionally cuts off a lock of hair to symbolize that they are now of one heart. Three, seven or nine days after the wedding, the bride returns to her maiden home to visit her family. Some couples opt to go on a honeymoon vacation as well. There are also customs regarding the birth of the first child.

Managing Employees Relations Essay Example | Topics and Well Written Essays - 2250 words

Managing Employees Relations - Essay Example Models of Employee Relationships The models of employee relationships hovers basically around two approaches-individualism and collectivism. In the individualistic approach focus is rendered on the development of the productive capacity of individual employees in the concern. The development of the employees on an individual network can be accomplished through formal training approaches or through motivating the people through financial or other rewards to render productivity to the concern. This practice helps at enhancing both the commitment and loyalty of the employees working in the concern. Similarly the workers can be called for participation in the decision making activities in the concern. This helps in the enhancement of participative management in the concern. In contrast to the individualism approach the organisations also work on the collectivism approach that depends on a great extent on the existence of trade union bodies. Through the existence of trade union bodies the organisations can encourage the employees to take part in decision making activities regarding such events that tend to directly have impact on them. Like the trade unions can be encouraged by the human resources managers of the concern to collectively bargain with the employees in regards to their wage and employment needs (Purcell, 1987, p.536, 538). In regards to the above discussion the paper focuses to understand the employee relation practices employed at ACME in regards to the various events involving the employees of the concern. Identification of the Management Style Used by ACME Recruitment The management style of ACME in the recruitment process focuses not only on the experiences of the candidate but also on the knowledge potential of the person that would be helpful to serve the concern. Moreover the recruitment process also involves the incorporation of a psychometric test that not only gauges the potential of the individual but also helps the managers in gauging the i ndividual based on different situations. Again recommendations from the family circle of employees is not entertained rather friends or colleagues of employees working in like position are called for interview. A major chunk of the potential roles in the organization are filled in by internal people. Though the management focuses on engaging fresh blood from the society for the primary roles the bigger posts are filled in by people working previously in the organization. This recruitment process entailed by the organization is justified in that it aims to evaluate the skills and aptitude of the people or the interviewees in relation to the posts created in the concern. This helps in effectively matching the ability of the workers to the needs of the concern. Moreover the use of psychometric tests in the organization also helps in conforming the skill sets of the employee along with rightly judging the personality traits of the individual needed to match the concern’

Behavioural Finance Research Paper Example | Topics and Well Written Essays - 3750 words

Behavioural Finance - Research Paper Example Montier’s articles and assess them one by one by providing supportive argument. Under this topic, Mr. Montier examined the QWERY keyboards and gave reasons as to why they are still in use today (Shiller 51). It is evident that QWERTY keyboard was established in 1874 by Christopher Sholes who saw the need to reduce the typing speed because the type writer that was in use during those times was jamming of plates in the mechanical arms due to the ease of typing that made people type faster (Thaler 8). Therefore, Mr. Montier clearly explained why the QWERTY keyboard was developed and why it is in use today. He also touched on the concept of Dvorak keyboard which is an alternative keyboard to the QWERTY but it was not adopted because it is efficient than Dvorak and certain studies suggest that the difference in their speed is very low and insignificant. However, Montier’s problem is that with adaptation of QWERTY keyboard up to date clearly implies that the benchmark policy that was used to develop this keyboard limits technological advancement and that, pers onally, he cannot come up with a policy benchmark (Thaler 3). How is technology involved? His reason for not coming up with a policy benchmark is the fact that such policies restrict technological advancements and confine them to one place for a long time (Dopfel 78). The reason as to why I support his argument of rejecting policy portfolios is the fact that they do not interpret investment risks correctly. This is because they concentrate too much on profit making than on the risks involved and the best way to deal with them. Therefore, Mr. Montier’s argument about of typewriters and benchmarks is correct. According to Montier, the notion of investment that was used in earlier times was better than the modernized idea and depiction of investment (Shiller 52). He clearly imply that the main aim of investment in early days was to look for value through purchasing what was

Business Organization And Policy Essay Example | Topics and Well Written Essays - 2250 words

Business Organization And Policy - Essay Example This essya stresses that as the implementation is going on, the performance should be measured and evaluated to ensure no deviations from the plan. If there are any deviations, the plans are modified to ensure the right path is taken. Due to continuous changes in the environment SWOT analysis is conducted so as to respond to the changes. This involves analysing the strengths and weaknesses of the organization as well as opportunities available in external environment and potential threats. This leads to the start of the planning process. This paper makes a conclusion that rapidly changing business environment forces organizations to engage in continuous planning process. Analysing the internal and external environment is essential as it enables the organization to change its structures and strategies to enable quick response to the changes. The business planning process enables the firm to set a roadmap to follow by determining the nature of the business, the product offerings, nature of competition, legal requirements and location of the business. Policies are formulated to enable the business to accomplish its objectives hence the overall business mission but control and evaluation is required to ensure activities are going according to the plan. Locating an organization in a concentrated area allows it to enjoy external economies such as; skilled labour, improved distribution channels, services and amenities, specialization, use of by-products, support from larger companies and shared technology.

Lens Crafters Case Study Essay Example | Topics and Well Written Essays - 500 words

Lens Crafters Case Study - Essay Example The value chain focuses on streamlining both the internal and external factors of the organization and improving on their human resource and product creation. Operation management activities are focused on ensuring an organization addresses specific issues affecting the organization by analyzing the effectiveness of each process undertaken by the organization (Tarun, 2012). Customer experience is improved by how effectively an organization handles both its external and internal operations. In creating an efficient operation administration scheme, one major impediment is creating an evenhanded system monitoring every operation. This could be solved by designing priorities in the operation within the association as Leitner & Sihn (2012) argue. An additional test is how effectual the changes in operation would manipulate customer awareness on an organization. This could be solved by enacting customer research approaches that would allow an organization understand the customer trends in terms of demand and opportunities. Lens Crafters value chain is effective in ensuring that the organization retains a significant competitive advantage in the market. The quality of the value chain has ensured Lens Crafters enjoy a comfortable market position in terms of customer satisfaction. The value chain mostly focuses on putting in place the right human resource team and creating customer satisfaction products. The value chain in Lens Crafters has enabled the organization to monitor and improve on its major operations. The most significant performance measurement strategy on the service delivery design would be consumer reaction and perception of the organization. This could be determined by analyzing the sales or consumer feedback on service delivery. Evaluation of sales and consumer feedback are most appropriate in gauging a service delivery design. The selection of sales numbers is based on the fact that sales depict the accurate consumer perception on a

Skilled Nursing and Continuing Long-Term Care (SLP) Essay

Skilled Nursing and Continuing Long-Term Care (SLP) - Essay Example People go to SNFs when they need assistance with their medical treatments. These patients are mostly on respirators, feeding tubes, or a variety of other problems which need medical treatment. SNFs are the second choice after hospitals as these patients are treated fully in the hospitals but need constant care and assistance. The nurses in SNFs are trained professionally in dealing with patients and medicines. They provide patients with 24 hours care but these facilities are smaller than normal nursing homes (Rosdahl, 2008). The advantages of SNFs are that they are much smaller than hospitals or regular nursing homes which mean that the patient would get full attention and would be easily able to call the nurses for their needs. If the patient is not satisfied with any part of the facility, it will be easier to reach to the social workers and a solution is given immediately. SNFs are also more focused towards rehabilitation and healthy living with activities such as regular physical therapies, occupational therapists visiting, and speech therapies for patients who need it. They also take care of the emotional, social, and spiritual well being of the patient. Most importantly SNFs have nurses that provide patients with the direct care. They have a professional team of individuals that belong to different fields such as nurses, therapists, physicians, social workers, etc. They provide the patients with the needed treatments and are available all the time (Rosdahl, 2008). There are some disadvantages and dangers to the use of SNFs which are recently greatly developed. These disadvantages are due to the complex and deteriorating system of long term care in the U.S. Many patients go directly from Intensive Care Units to SNFs where they need critical care but because the nurses are paid lesser, their efficiency levels are lower, and that affects the care given to the patients. SNFs have dangers such as medication errors, falls, and spread of infections. There

Lens Crafters Case Study Essay Example | Topics and Well Written Essays - 500 words

Lens Crafters Case Study - Essay Example The value chain focuses on streamlining both the internal and external factors of the organization and improving on their human resource and product creation. Operation management activities are focused on ensuring an organization addresses specific issues affecting the organization by analyzing the effectiveness of each process undertaken by the organization (Tarun, 2012). Customer experience is improved by how effectively an organization handles both its external and internal operations. In creating an efficient operation administration scheme, one major impediment is creating an evenhanded system monitoring every operation. This could be solved by designing priorities in the operation within the association as Leitner & Sihn (2012) argue. An additional test is how effectual the changes in operation would manipulate customer awareness on an organization. This could be solved by enacting customer research approaches that would allow an organization understand the customer trends in terms of demand and opportunities. Lens Crafters value chain is effective in ensuring that the organization retains a significant competitive advantage in the market. The quality of the value chain has ensured Lens Crafters enjoy a comfortable market position in terms of customer satisfaction. The value chain mostly focuses on putting in place the right human resource team and creating customer satisfaction products. The value chain in Lens Crafters has enabled the organization to monitor and improve on its major operations. The most significant performance measurement strategy on the service delivery design would be consumer reaction and perception of the organization. This could be determined by analyzing the sales or consumer feedback on service delivery. Evaluation of sales and consumer feedback are most appropriate in gauging a service delivery design. The selection of sales numbers is based on the fact that sales depict the accurate consumer perception on a

ENVIRONMENTAL POLICY Essay Example | Topics and Well Written Essays - 2000 words

ENVIRONMENTAL POLICY - Essay Example This is a significant environmental issue that has raised debate across the country and the increasing use of technology by the developed nations is one of the major threats that prompted the signing of the Montreal protocol. The agreement also sought to tighten the ban on trading some substances like methyl due to its great contribution to the ozone depletion with dire climatic consequences on Earth. b. Implementation schedule. Since 1987 when this protocol was observed after the Vienna convention, there has been a series of meetings among the parties and there is as steady implementation and amendment of some of the policies. The initial meeting was meant to address the mode of mitigating the emission of ozone depletion substances with particular focus to the chlorofluorocarbon compounds (Reitze, 2001). Further meetings have been occasioned by assessment of the implementation process with the last meeting of the open-ended working group emphasizes the strict adherence to the protoc ol rules and regulations which is now backed up by licensing of various manufacturers and their nations on the limit of the producing the specified ozone depletion process (United Nations Environment Programme,2006). Implementation schedule was spread over years that spans from the protocol’s inception to 2013. c. Number of participants and the reasons for the level of participation. The Protocol currently has 197 parties who are assigned various legal obligations to undertake. The members participation is determined by the economic status since this highly gives the estimated volume of industrial production which in turn explains the production of ODS (Reitze, 2001). The developed member states have been found to be the major polluters as compared to the less developed countries and this explains why their participation is more of concern. The developing countries are most involved in promoting environmental care campaign in their respective nations. d. Compare the success o f the Montreal Protocol to that of the Kyoto Protocol and address the reasons for any differences in terms of National Interests of those that elected to participate and those that have not. The two protocols have a common denominator in the form of reducing the exponential rate of ozone layer depletion emissions. It is worth to note that US has been at the center stage as the global economic powerhouse in respect to the control of this climate menace issue. On the basis of cost benefit analysis US realized that it has more to lose from Kyoto protocol and therefore vehemently opposed it. On the other hand Montreal protocol was seen to be relatively friendly and proved to be acceptable by many countries. One of the issues that dogged Kyoto protocol was its monetary compensation mechanism which did not go down well with US and other nations. The conflicting interests of various participants arose from the cost/benefit analysis of the monetary consideration of Kyoto protocol against th e licensing of Montreal protocol (Oberthu?r & Ott, 1999). On aggregate many participants promoted adoption of Montreal protocol as being effective and economical to implement. 2. United Nations Convention on the Law of the Sea (UNCLOS): a. Discuss the issue of â€Å"Property Rights† as it relates to UNCOLS The United Nations Convention on the Law of the Sea (UNCLOS) provides a legal framework that empowers various countries bordering sees and oceans on how to manage them (Sands, 2003). It is important to

The House on Mango Street by Sandra Cisneros Essay Example for Free

The House on Mango Street by Sandra Cisneros Essay The book The House on Mango Street written by Sandra Cisneros is merely a collection of different (and in some ways similar) traits, experiences, cultures, traditions, values and points of views of the girls and boys living at Mango Street. From these collections collating in 44 inter-related chapters create a single topic of how the main character in the story Esperanza Cordero evolves, empowers herself, dreams and struggles to have a life she is aspiring of someday while still focusing herself to remain her feet standing on the ground.   The story also tackles some human rights issues although it is laid not in a tragic or overly dramatic situation since lightness and simple poetic style of narrating events and describing characters through short outline and vignettes are the manner the author has used.   Hence, the book is intentionally written for young mind readers for them to know and understand serious issues in a light touch. As a young preadolescent girl, Esperanza Cordero manages to identify herself in each of the character lives in her neighborhood although not exactly in the same manner.   She successful shows through her descriptions of the place and people in her life the not-so-good and not-so-bad experiences of the dual citizenship inhabitant in the city like the Latin – Americans.   She is most likely referring to females.   These females are what she actually provides us to be able to identify her as herself, or someone she wishes she could be or someone she hates exactly being a member of minority gender living in a minority community, in each of the characters given. Esperanza Cordero belongs to a family of six composed of a mother, a father, two brothers named Kiki and Carlos, and with only one sister Nenny.   Like many other kids, she has inner hopes and aspirations.   One of them is having a house she owns someday, and described as a white big one with lots of free space and bathrooms, perhaps due to her own experiences of living in a house of only one bedroom and bathroom.   After some changing of locations, her family decided to acquire a house to call their own to be free from rental obligations and irritating experiences of having landlords and landladies.   The house is situated at Mango Street.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Some of the characters in the story are Cathy described as a typical rich girl who easily gets annoyed with the rudeness of people especially Esperanza’s male neighbors, Sally who at a young age forced to get married just to be free from domestic violence at home, another rich girl Alicia who always gets horrified with rats in their house, Elenita the fortune-teller, the materialistic girl Marin, Ruthie and Rafaela who always keep on telling Esperanza the disadvantages of marrying at a young age, and sisters Lucy and Rachel who are her playmates and companions in biking and in some memorable adventures along with her sister Nenny.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Empowering herself is passively done as it is only a shadow which reflects her girly actions through her noting down of observations and understandings.   It means that the struggle of Esperanza to be free over power and superiority does not mean that she has to gain it over others or at the expense of others.   It only suggests that being true to oneself, as what she does, is enough to make things change for betterment. R E F E R E N C E S Cisneros, Sandra. The House on Mango Street. New York: Random House Inc. 2005

Difference between international and comparative HRM

Difference between international and comparative HRM The growth in international trade and globalisation has encouraged firms to expand their operations worldwide, which has resulted in the emergence of new markets such as China, India, South East Asia and Latin America. This trend has also been accompanied by an increased level of competition amongst firms at both national and international level. The challenge of managing a workforce worldwide with different cross-cultural skills, competencies and demographic characteristics means that managers can no longer rely on traditional HRM models developed for Anglo-Saxon countries. Many firms underestimate the complexities involved in international operations, and there is some evidence to suggest that business failures in the international arena may often be linked to poor management of human resources (Desatnick Bennett, 1978). Western academics and practitioners have thus moved from traditional international HRM issues to the area of comparative HRM. In order to maximize cross-national management capabilities, there is need to understand how employees in different national settings respond to similar concepts within their particular functions. This essay has been structured as follows. In the next section, I will examine the difference between international and comparative HRM. I will then look at the way comparative HRM assist academics and practitioners appreciate the differences in the strategies and processes in MNCs. A conclusion is then presented. Difference between international and comparative HRM International HRM has been defined as HRM issues, functions, policies and practices that result from the strategic activities of MNEs (Scullion, 1995). IHRM deals principally with issues and problems associated with the globalisation of capitalism. It involves the same elements as domestic HRM but is more complex to manage, in terms of the diversity of national contexts and types of workers. The emphasis is on the MNCs ability to attract, develop and deploy talented employees in a multinational setting and to get them to work effectively despite differences in culture, language and locations. International HRM tends to mitigate the impact of national culture and national employment practice against corporate culture and practices. Comparative HRM, on the other hand, is a systematic method of investigation that seeks to explain the patterns and variations encountered in cross-national HRM rather than simply describe HRM institutions and practices in different societies. According to comparative HRM literature, different national business systems arise from differences in specific historical, cultural and institutional heritage in certain countries. Comparative differences occur due to decisive historical events such as the process of industrialisation or due to the legacy of pre-modern forms of social organisation. Hofstedes (1980) adopted the culturalist perspective where he argued that national business styles emerge due to ingrained cultural attitudes and mental schemas. He described culture under five dimensions which are power distance, individualism, masculinity, uncertainty avoidance and long-term orientation. Other researchers claim that HR management practices differ between nations due to the presence of specifically national institutions such as education, banking services or state/legal support. In what ways (if at all) does an understanding of comparative HRM assist academics and HR practitioners appreciate the difference in the strategies and processes in MNCs which are often termed as International HRM? The contrasted view to a divergence point mentioned above is that some academics claim that with HRM policies and practices are becoming universal (tending more towards the dominant American models) and that country-of-origin effects are no longer relevant. The pressure to build standardised operations internationally is strongest in sectors where competition is highly internationalised and where firms compete on the basis of a similar product or service across countries such as in cars and fast foods. They have put forward several reasons to explain this trend. Firstly, all MNCs operate in one global market and therefore have to respond to the same environmental pressures such as globalisation and technology, the growth in international trade and the move towards an internationally-integrated financial system. Secondly, the widespread practice of benchmarking best practice in terms of cost, quality and productivity may also have contributed to convergence of international HRM models for e.g. Japanese style lean-production system in the 1980s and 1990s. Moreover, these pressures towards convergence stem in part from the influence of MNCs themselves through their ability to transfer practices across borders and erode country-of-origin effects. Finally, the formation and development of like-minded international cadres mostly from American or European business schools may have contributed to homogenised international HRM policies and practices. Since the early 1990s, the international HRM literature has been dominated by models and typologies aimed at identifying how international HR fits with organisational strategy. Bartlett and Ghoshal (1998) argue that the main issue for all multinational companies is the need to trade-off the advantages global efficiency namely the coordination of its operations to achieve economies of scale and scope as opposed to the need to differentiate its products and services to meet the local demands. They also identified a third pressure, namely worldwide innovation and learning, whereby firms are encouraged to support innovation and learning across their network of subsidiaries rather than simply relying on research and development at the headquarters. MNEs then follow the appropriate HRM policies and practices according to the structure of the organisation, the competitive strategy chosen or stage of corporate evolution reached. Below, the Taylors (1996) model of strategic international HRM has been described. Exportive This is essentially a model where the HQ management takes home country management approach and try to implement them in their foreign subsidiaries in order to achieve economies of scale. In this model, there is a system of hierarchy and a centralised control. This is especially useful in instances of uncertain political environment and high risks demanding greater control from corporate parents. Given this pattern of centralisation, there is a considerable amount of forward policy transfer and less reverse transfer from subsidiaries to the HQ, i.e. they rely mainly on the technical know-how of the parent company. Global firms offer products or services that are standardised to enable production to be carried in a cost-efficient way. Their subsidiaries are not subject to rigid control except over the quality and the presentation of the product or service. This structure is normally associated with the American firms with their formalised, bureaucratic control and a dominant finance sy stem to internalise risks. Adaptive Differences in the host environment demands and conditions mean that overseas subsidiaries have to operate independently. This is common where departing from established practices in host environments is unlawful. For example, in some Germany, there is a legal obligation to negotiate with employee representatives concerning major organisational changes. In other cases, transferring practices may be legal but would go against traditional practices at the risk of losing goodwill from staff. Firms may decide to forgo HQ control if there is the possibility to exploit most efficiently the local labour markers. For example, MNCs which origin from high-cost highly regulated economies such as Germany may well choose not to transfer important elements of their HR systems such as collective bargaining or apprenticeship if they move to lower wage, lightly regulated economies such as China. Integrative It is also argued that the more management processes and activities can be integrated across geographical boundaries, the easier it is to share resources and knowledge. They can identify and best use the skill and management talent that exists across the MNC network allowing for both global integration and local differentiation. As mentioned previously, international HRM processes consist of the same activities as domestic HRM but applied in an international context. These include an accurate human resource planning to ensure that the MNCs have the right people at the right place around the world, good staffing policies that capitalise on the world-wide expertise of expatriates and locals, performance appraisals that fit with the competitive strategies of the HQ, adequate training and development to ensure that expatriates do not suffer from culture shock and compensation policies that are strategically and culturally relevant. The focus in international HRM strategy is how MNEs coordinate their geographically dispersed operations strengthening the organisational culture, promoting commitment and encouraging willingness in employees to act in the interests of the firm. Recruitment and selection of international managers Employees play a crucial role in sustaining and coordinating their geographically dispersed operations. The challenge is that of resourcing international operations with people of the right calibre. Traditionally, MNEs sent expatriates, i.e. a parent country national abroad to ensure that the policies and procedures set by the parent -company were being followed as well as to bring expertise to the local employees. However, the high number of expatriate failures has meant that more and more MNEs are turning to host country nationals to satisfy the international staffing needs. The prominent reason to explain international assignment failures was the inability of the expatriate or his family to cope with the culture shock. Researchers revealed that international business travellers faced problems in their personal lives and were victims of stress. Moreover, changes in legislative conditions affecting labour relations combined with security issues have made it more costly to use expatr iates at senior management positions at subsidiary level. The advantages of employing local nationals are that they are familiar with local markets, the local communities, the cultural setting and the local economy. They speak the local language and are culturally assimilated. They can take a long-view and contribute for a long period (as distinct from expatriates who are likely to take a short-term perspective). Expatriates are only used as technical troubleshooters and general management operatives. This means academics need to find the best ways to recruit and select local managers and help them cultivate a global perspective rather than a narrow outlook on how to conduct business in the local environment. International pay and reward and performance management The concept fair pay and reward is also subject to different interpretations depending on the national business system. Triandis (1998) differentiated between vertical cultures which accept hierarchy as given whereas horizontal cultures accept equality as given. In individualistic cultures, there are few rules and norms about correct behaviour and employees expect to be rewarded on their own merits and performance. Countries like US feature at the higher end of the individualistic spectrum. On the other hand, collectivism emerges in societies that have many rules and regulations about correct behaviour. In these societies, employees accept rewards or recognition on the basis of their seniority, efficiency and conformity with the organisational values rather than on the basis of their creativity or professionalism (Pascale and Athos, 1981). China is an example of a collectivist society. In such societies, rewards for individual performance or differentiating between employees are not acceptable.   Indeed, the prevailing view is that it takes the contribution from everyone to achieve continuous improvement (kaizen) in Japanese enterprise. Singling one employee may cause him to lose face and consequently a loss of goodwill for the expatriate manager. Moreover, an understanding of the body language is vital for senior expatriate managers when providing feedbacks. While in individualistic society, it is perfectly acceptable for a subordinate to participate in a discussion with his senior, in collectivist societies such as India, disagreeing with ones supervisor is considered disrespectful. Furthermore, countries like Korea and Taiwan prefer more subtle ways of communicating feedbacks. Up-front reprimand or performance appraisal is likely to clash with the societys norms of harmony and the employees may view it as a personal affront. Understanding these local customs and mapping them across countries is an exciting field of study for researchers interested in global performance management systems. Training and development Training and development is vital to ensure that the workforce remains competent and flexible by developing the know-how thought necessary for success in the company and on the job. Scholars have highlighted the importance of national culture on training and development in terms of the hard and soft approach. The hard approach views employees in the organisation as a mere resource to achieve goals of the organisation while the soft approach views them more as valued assets capable of development (Tyson and Fell, 1986). This approach obviously influence the level amount of institutional (percentage GDP) spent on education. The German tradition adopts the soft approach and relies on formal apprenticeship, functional rotation and career path where technical expertise is gradually developed. UK which support the hard approach, believes that the individual is responsible for funding his own education and career advancement. This difference in national training and education systems will m ean that the skill and competence profile of the workers available on the labour market will vary from one country to another. Comparative studies have also shown that there are national differences in the way that managerial careers and management development are organised. Both Japan and France rely on elite recruitment, that is, future managers are decided at the point of entry based on their exceptional qualifications. This contrasts with the American belief of self-improvement where the philosophy is its never too late to change. Also, there are also noticeable differences in the teaching and learning style across countries. The idea of working in groups is more natural to Asian than individualist Anglo-Saxon managers. German and Swiss managers favour structured learning environments and coming to the right answers and are tolerant of confrontation. Asian countries, in contrast, are more concerned about status differences and may be unwilling to exchange ideas against their mentors. This will consequently impact on the format of delivering training for the practitioner, whereby the Asian employees might prefer lecture-type training and German and Swiss might prefer the seminar-type interpersonal interaction. Employment relations Finally, the type of employee relations pursued by the MNE depends principally on the national business systems characteristics of the both the home and host countries. According to Hall and Soskice (2001), there are two varieties of capitalism: Liberated market economies and coordinated market economies. In liberal market economies, firms coordinate their activities primarily via hierarchies and competitive market arrangements.   Market relations are characterised by arms length exchange of goods and services and formal contracting. The demand and supply of goods and services are regulated though market mechanisms. There are comparatively fewer state controls. Nations like US and UK fall under this category of market. Consequently, US MNEs adopt a short-termist shareholder value mentality which means they are less willing to offer secure employment to their workers. Therefore, management of labour in the US mirrors the economic model of demand and supply, with market determined wa ges, hire-and-fire practice and many workers employed on a temporary basis. Employers in US are also more resistant to trade union organisations than in other developed industrial democracies and the legal support for trade union organisations and collective bargaining are relatively weak in the US compared to those in other countries. In contrast, in coordinated market economies, firms depend more heavily on non-market relationships to coordinate their activities with other economic actors. These non-market modes means there is greater reliance on private information inside networks and a greater reliance on collaborative relationships. Coordinated market economies are also characterised by a higher degree of government intervention. Countries such as France, Italy and China are examples of such economies. To illustrate, countries like Germany and Japan have adopted the long-termist approach whereby the interests of stakeholders are considered rather than simply of shareholders. This means these MNEs can offer its employees long-term employment. German trade unions are considered as a powerful stakeholder in the labour market and have the right of collective bargaining, i.e. employers need to so consult their workers before any major changes are carried out. To conclude, the basic purpose of examining human resource from a comparative and international perspective is that it contributes to an understanding of the extent to which there are differences between organisations and their subsidiaries located in different countries. The main difference between comparative and international HRM is comparative HRM seeks to explain the differences arising between different business systems while IHRM downplays the importance of host and home country differences. The greater cultural distance between home country and host country, the harder it will be for the MNCs to transfer home country philosophies and practices. This impact on the way HR practitioners have to implement their policies but opens up new avenues for research for the academics. References Bjorkman,I and Stahl (2006) International HRM research: An introduction to the field Stahl and Bjorkman (Eds) Handbook of Research in International HRM, Edward Elgar, Aldershot. Almond, P. And Tregaski (2007) International HRM, pages 634-648, in Beardwell and Claydon (Eds) HRM: A contemporary approach, Pearson, London. Ferner, A. (1997) The country of Origin Effect and HRM in multinational corporations Human Resource management Journal 7(1) 19-38 Edwards, T and Ferner, A. Managing Human resource in Multinational companies in Bach,S. (Ed)(2005), Personnel Management transition, Blackwell, Oxford. Reiche, B (2007) The effect of International staffing practices on subsidiary staff retention in multinational corporations International Journal of HRM 18:4 Nikandrou, I et al (2008) Training and Firm performance in Europe: The impact of National and Organisational characteristics International Journal of HRM, 19: 11 Dowling and Welch, International Human Resource management, 4th Edition, Thomson Armstrong. M., A Handbook ofHuman Resource ManagementPractice, 10th edition, (Kogan Page) London 2006 Anne-Wil Harzing, J.Van, Ruysseveldt, International human resource management, 2nd edition, Sage 2004 Hall, Peter A.;Soskice, David, An introduction to Varieties of Capitalism, varieties of capitalism, August 2001, Oxford Scholarship Online monograph.

Aristotle, Connectionism, and the Brain :: Philosophy Psychology Papers

Aristotle, Connectionism, and the Brain Can a mass of networked neurons produce moral human agents? I shall argue that it can; a brain can be morally excellent. A connectionist account of how the brain works can explain how a person might be morally excellent in Aristotle's sense of the term. According to connectionism, the brain is a maze of interconnections trained to recognize and respond to patterns of stimulation. According to Aristotle, a morally excellent human is a practically wise person trained in good habits. What an Aristotelian theory of ethics and a connectionist theory of mind have in common is the assumption that the successful mind/brain has the disposition to behave appropriately in appropriate circumstances. According to Aristotle, the good person knows the right end, desires and chooses to pursue it, and recognizes the right means to it. Thus the good person's brain must be able to form certain moral concepts, develop appropriate behavioral dispositions, and learn practical reasoning skills. I shall arg ue that this collection of the brain's cognitive capacities is best accounted for by a connectionist theory of the mind/brain. The human condition is both material and moral; we are brain-controlled bodies with ethical values. My essay seeks to understand the relationship between our brains and our values, between how the brain works and how we make moral decisions. How can the brain be a mind, a conscious person? Recently, some philosophers have argued that human consciousness and cognitive activity, including even our moral cognition and behavior, can best be explained using a connectionist or neural network model of the brain (see Churchland 1995; Dennett 1991 and 1996). (1) Is this right? Can a mass of networked neurons produce moral human agents? I shall argue that it can; a brain can be morally excellent. A connectionist account of how the brain works can explain how a person might be morally excellent in Aristotle's sense of that term. 1. Connectionism The brain receives input and somehow transforms it into output. How does it do it? In part because of the extraordinary technological feats achieved using digital processing computers, the brain has often been interpreted as a symbol manipulator and its cognitive activities as the transformation of symbols according to rules. By contrast, recent successes with parallel distributed processing computers have encouraged a connectionist theory of mind which regards the brain as a pattern recognizer and its cognitive activities as the transformation of neuronal activation patterns; however, these pattern transformations are not rule-governed processes, but straightforwardly causal processes in which networked units (neurons) excite and inhibit each other's activation level.

Coles Sales Promotion Essay

Pacific managing director of Nielsen Consumer Group, saidâ€Å"It’s no surprise that consumers are increasingly concerned about their household budgets in response to such fluctuating economic conditions, and the cost-saving strategies currently being employed by consumers are likely to continue well into the year. †(Jessica Kennedy,2011)Due to the rising concern of the current unstable economic condition in Australia, the people have developed a tendency to save or spend only what is necessary. There is also a concern for the rising food and fuel prices and more and more people are looking for good deals and bargains for the basic necessities required to run a household. If this holds true to the working population then this will hold true even more to the student population in Australia who perhaps only have a part time job and live on a fixed budget. Market analysis: The student population contributes a lot to the economy of Australia. In 2008, the total tertiary student community in Melbourne was around 208,800 people and international tertiary student population numbering was at least 28,150 (Melbourne City Research, 2010). These numbers have steadily risen in the past years and will continue to do so. From this situation analysis, it can be derived that it would be a successful venture if fresh and frozen fruits and vegetables were offered at a discounted price by Coles to students in Melbourne for a limited period of time. And if the response is successful in Melbourne it can be an option to expand to other cities as well. Sales promotion pitch: Offering a 15% discount to students from the 1s of July to the 31st of July on all of Coles’ fresh and frozen fruits and vegetable line. SWOT analysis : Strengths:The current economic condition will help the response to a sale if it is held. It will attract the customers and increase revenue. It is also a healthy campaign as fruits and vegetables are being offered at a discount to students to encourage them to eat healthier and will boost the image of Coles. Weaknesses:The risk that the response may not be as enthusiastic as predicted from the target audience. Also that it is targeting a very specific segment of the market and that can be risky to the campaign if the response is not as predicted. Opportunities:The option to hold this sale every half year or more frequently if response is good and also in a larger number of cities. Threats: Competitors like Woolworths and Aldi may also put their items on sale to compete with Coles. Target Segment Demographics: Treating the market as heterogeneous, as all the people of Melbourne are not being targeted and they don’t have similar wants, the target profile for the campaign would look like the following : * Age|* Late teens and above| * Gender|* Male and female|Geographic area|* Melbourne| * Occupation|* Students| * Household size|* Living alone or with housemates| * Lifestyle and Habits|* Lives on a budget, tends to look forthe most reasonable prices, prioritizes saving andhas a slightly more healthy lifestyle. | The typical profile of the segment being targeted would be a College student who Lives alone or with housemates or in a dorm and who purchases their own groceries. Within the target audience there will be differen t views and attitudes about fruits and vegetables. The types of opinions are usually four in kind. They are: * The appreciators: will be the portion of the target market that like eating healthy and enjoy eating lots of fruits and vegetables. These people may be more health conscious and aware of the fact that fruits and vegetables are a very important part of the diet. â€Å" I love fruits and vegetables! They are a part of almost all of my meals for the day†* The acceptors: are the segment of students that eat a moderate amount of fruits and vegetables but also prefer meats and other food items.I like fruits and vegetables but I don’t like including them in all my meals, I prefer meat†* The resistors:this segment is not very fond of fruits and vegetables but eat them on occasion. â€Å"fruits and vegetables are ok but I would rather eat something else†* The rejecters: This portion of students is strongly against adding fruits or vegetables to their daily meals and would most definitely eat other foods ins tead. Insert refrence pg. 206 One of the purposes of the campaign is to try and get the percentage of the resistors and the rejecters to convert to either the acceptors or the appreciators. Time frame: The promotion will last for one month. Starting July 1st and ending July 31st. The duration chosen is during the offseason period where there are no big sales held otherwise. This will make it easier to persuade the target market to purchase their groceries at Coles as it will be cheaper to do so. It gives them an incentive to buy. 20 specimen subjects from Chisholm College that fit the target profile completed a survey about why they picked a particular store over another. Four fixed options were asked and the results were as follows: More than half, i. e 11 people out of 20, said that the main reason they choose a store was because of its low prices. 6 people said they choose a store according to how conveniently it’s located, 2 said it was because of loyalty to the store and 1 said because of good customer service. This further emphasizes the fact that if a sales promotion was held, the response would be enthusiastic and the campaign would be successful. Main Objective: * Increasing the sales of fresh, frozen and canned fruits and vegetables by 5 to 10 percent in the month of July. Initially only in Melbourne with an option to expand to other cities if the response is positive. Additional objectives: * Enhance customer loyalty * Create new customers * To reinforce brand advertising * Encouraging students to eat healthier Perception – achieve at least a 65% increase in awareness of the sales promotion in the firstweek Cognition – Achieve recall of discount period at Coles by at least 80% of the students in Melbourne Persuasion – Make the target audience want to go to Coles for their groceries rather than its competitors Emotion – Induce humor and fun through the advertisement Association – Associate Coles with the most reasonable prices and quality goods Behavior – Persuade at least 3% of the customers that shop at Woolworths, Aldi and other competitors to switch over to Coles Approach: The type of approach to be used for this promotion is the emotional approach and a soft sell strategy. Humor will be used a medium in the advertisement to allow students to relate to the campaign easily and for retention of the message to create the need to buy fruits and vegetables at Coles. An anonymous survey was conducted using 20 students in Chisholm College that fit the target audience. They were asked to state what kinds of advertisements they remembered the easiest out of a given three choices. Out of 20 students, 15 said humorous advertisements were the easiest to remember, 2 said informative and 3 said shock advertising. Pull promotional strategy: ‘ In a pull strategy, the manufacturer directs the majority of its promotional effort towards the ultimate consumer in an attempt to get them to pull the products through the marketing channel. ’ (McColl – Kennedy, JR, 1994) A pull promotional strategy creates a high degree of awareness amongst consumers and implants a desire and an interest for the product. This makes the customers to go to the retail store with the determination to find the product to purchase it and if it is not available they urge the retailer to stock up on it. This is the strategy that Coles is aiming at following as the message will be sent directly to the ultimate consumers who are in this case the students, urging them to purchase frozen, fresh and canned fruits and vegetables. And when the demand exceeds the supply, it will cause the Coles retail stores to urge the wholesalers and other links in the product chain to acquire the product causing a pulling effect through the marketing channel. Communication: In order to inform the potential customers about the promotion, effective and efficient advertising must be carried out. The use of Television, the internet, newspapers and magazines help in doing so. Since the target market is only students, it would also be productive to display the advertisements on social networking sites on the internet. To further reach students fliers can be put up on the notice boards and in the college magazines. Point of purchase displays also helps as it improves in store branding and keeps the customer informed. Having sales signs near the product also can lead to impulse buying. The key message sent out here would be that it is cheaper to buy your groceries at Coles than at any other supermarket. Eliciting the desired response: The main reason for fierce advertising and promotions is due to the reason that the sales promotion will be carried out for one month only. During this time period, Coles seeks to attract as many customers as possible to their stores in Melbourne. It is true that the potential customers go through a behavioral or psychological process before purchasing a product called a response hierarchy. The Coles advertisements and promotions seek to fulfill all the steps in this hierarchy chain.

Pressure Measurement and Calibration

52 PRESSURE MEASUREMENT AND CALIBRATION (TH2) 53 EQUIPMENT DIAGRAMS 54 55 56 EQUIPMENT DESCRIPTION Refer to the drawing on pages 56, 57 and 58. This equipment is a bench top unit designed to introduce students to pressure, pressure scales and common devices available to measure pressure. The equipment comprises a Dead-weight Pressure Calibrator to generate a number of predetermined pressures, connected to a Bourdon gauge and electronic pressure sensor to allow their characteristics, including accuracy and linearity, to be determined. The Dead-weight Pressure Calibrator, Bourdon gauge and pressure sensor are mounted on a common PVC base plate. The electrical console is free standing. The Dead-weight Pressure Calibrator consists of precision ground piston (10) and matching cylinder (11) with a set of weights (12). In normal use the appropriate combination of weights is applied to the top of the piston, to generate the required predetermined pressure, and then the piston is set spinning, to reduce vertical friction, while the readings from the measuring devices are recorded. The operating range of the Dead-weight Pressure Calibrator and instrumentation is 20 kNm-2 to 200 kNm-2. The Bourdon gauge (5) and pressure sensor (6) are mounted on a manifold block (2) with a priming vessel (4) to contain the hydraulic fluid which is chosen to be water for safety and ease of use. A priming valve (7) between the reservoir and the manifold block allows the cylinder, manifold block and gauge on test to be easily primed with the water ready for use. A damping valve (8) between the cylinder and the manifold block allow the flow f water to be restricted to demonstrate the application of damping. An additional isolating valve (9) on the manifold block allows water to be drained from the manifold block or allows alternative devices to be connected for calibration. Such devices can be tested over the range 20 kNm-2 to 200 kNm-2. The Bourdon gauge (5) supplied is a traditional industrial instrument with rotary scale and mechanical indicator. The gauge has a 6† diameter dial that incorporates an arbitrary scale calibrated in degrees of rotation (independent of unit pressure) in addition to the usual scale calibrated in units of kNm-2. A clear acrylic front face allows observation of the Bourdon tube the mechanism that converts motion of the Bourdon tube to rotation of the indicator needle. The electronic pressure sensor (6) supplied incorporates a semi-conductor diaphragm that deflects when pressure is applied by the working fluid. This deflection generates a voltage output that is proportional to the applied pressure. The pressure sensor should be connected to the socket (20) marked ‘Pressure Sensor’ on the front of the console. The power supply, signal conditioning circuitry etc are contained in a simple electrical console (15) with appropriate current protection devices and an RCD (26) for operator protection. The electrical console is designed to stand alongside the Dead-weight Pressure Calibrator on the bench top. All circuits inside the console are operated by a main on/off switch (16) on the front of the console. 57 The various circuits inside the console are protected against excessive current by miniature circuit breakers, as follows: CONT (27) O/P (28) This breaker protects the power supply and circuits inside the console. This breaker protects the electrical output marked OUTPUT (23) at the rear of the console. The socket is used to power the IFD3 interface used for data logging. The voltage from the pressure sensor is displayed on a digital meter (17) on the electrical console. An additional conditioning circuit incorporates zero and span adjustments and allows the voltage output from the pressure sensor to be converted and displayed as a direct reading pressure meter calibrated in units of pressure. The zero control (21) and span control (22) are mounted on the front of the console for ease of use. A selector switch (18) allows the voltage from the sensor or the direct reading pressure reading to be displayed as required. The voltage from the pressure sensor is simultaneously connected to an I/O Port (19) for the connection to a PC using an optional interface device (TH-IFD) with educational software package (TH2-303). Alternatively, the signal can be connected to a user supplied chart recorder if required. Before use, the priming vessel must be filled with clean water (preferably deionized or demineralised water) and the calibrator, Bourdon gauge and pressure sensor fully primed. 8 OPERATIONAL PROCEDURES This equipment has been designed to operate over a range of pressures from 0 kN/m2 to 200 kN/m2 may damage the pressure sensors. In order to avoid such damage, DO NOT APPLY CONTINUOUS PRESSURE TO THE TOP OF THE PISTON ROD WHEN THE PRIMING VALVE IS CLOSED except by the application of the masses supplied. An impulse may be applied to the piston when operating at a fluid pressure of less than 200 kN/m2. This procedure is described in Experiment P1. The following procedure should be followed to prime the Dead-weight Calibrator and pressure sensors, prior to taking readings: Level the apparatus using the adjustable feet. A circular spirit level has been provided for this purpose, mounted on the base of the dead-weight calibrator. Check that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable). Open the damping valve and the priming valve. With no masses on the piston, slowly draw the piston upwards a distance of approximately 6 cm (i. . a full stroke of the piston). This draws water from the priming vessel into the system. Firmly drive the piston downwards, to expel air from the cylinder back towards the priming vessel. Repeat these two steps until no more bubbles are visible in the system. It may be helpful to raise the central section of the return tube between the manifold block and the priming vessel. This will help to prevent air be ing drawn back into the system as the piston is raised. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow ir to enter, and then close the priming valve. The following procedure describes the calibration of the semiconductor pressure sensor. The procedure differs if using the optional TH-303 software, in which case users should instead refer to the Help Text provided with the software. Remove the piston from the cylinder, and switch the selector knob on the console to ‘Pressure’. This the ‘zero’ control on the console until the display reads zero. This sets the first reference point for the sensor calibration. Return the piston to the cylinder, and reprime the system as described above. Place all the supplied masses onto the piston, with the greatest mass (2 ? kg) being added last. This corresponds to an applied pressure of 200 kN/m2. Spin the piston, and adjust the ‘span’ control until the sensor output matches the applied pressure. This sets the second reference point for the calibration. 59 The calibration may be tested by applying a mass to the piston, spinning the piston in the cylinder, and then comparing the applied pressure to the sensor output. Each ? kg of applied mass corresponds to 20 kN/m2 of applied pressure. This piston itself gives an applied pressure of 20 kN/m2. 0 NOMENCLATURE FOR TH2 The following nomenclature has been used for the theory and calculations presented in this manual: Name Piston diameter Cross-sectional area Mass of piston Mass on mass piston Applied mass Acceleration due to gravity Applied force Nom d A Mp Mm Ma g F Units m m? kg kg kg m/s2 kg Type Given Calculated Given Recorded Calculated Given Recorded Definition The diameter of the dead weight calibrator piston. Cross-sectional area of dead weight calibrator cylinder. Mass of the dead-weight calibrator piston. Mass applied to piston. Ma = Mp + Mm g = 9. 1 m/s2 Force applied to fluid in system by piston and masses. F = g x Ma Pressure applied to fluid by dead weight calibrator P = F/A Ambient (atmospheric) pressure of the surroundings. Applied pressure relative to the pressure of total vacuum Needle angle taken from Bourdon gauge scale Semiconductor output taken from console display Gauge pressure taken from Bourdon gauge scale Calibrated semiconductor output taken from console display Applied pressure Barometric pressure Absolute pressure Needle angle Semi-conductor output Indicated Bourdon gauge pressure Indicated semi-conductor pressure Pa Patm Pabs ? e Pb Ps N/m2 N/m2 N/m2 Calculated Recorded Calculated degree Recorded V N/m2 N/m2 Recorded Recorded Recorded 61 NOMENCLATURE FOR ERROR ANALYSIS The following nomenclature has been used for the error analysis presented in this manual: Name Indicated value Actual value Range Definition Gauge reading, i. e. the pressure indicated by sensor used True pressure, pressure applied by dead-weight calibrator Total range of values covered in the results, or total range of values measurable on instrument scale. Calculation Pi = Pb or Ps, depending on the sensor used Actual value = Applied pressure, Pa Range = Largest result – Smallest result = Pi max – Pi min or Range = Maximum possible reading – Minimum possible reading (200 kN/m? for apparatus used) No calculation. Precise data have a small scatter, indicating minimal random error ea = |Pi – Pa | ea max = ? (Pi – Pa)max? e%a = ea max X 100 Pa e%f = ea max X 100 Range Pmin = P1 + P2 + †¦.. + Pn n da = |Pi – Pmin| dm = da1 + da2 + †¦ + dan n ? = da12 + da32 + †¦ + dan2 n-1 ? Precision How closely the results agree with each other. Actual difference Modulus of the difference between indicated value and actual value Accuracy Maximum difference between indicated pressure and actual pressure Percentage accuracy Greatest difference between of actual scale reading indicated pressure and actual pressure, as a percentage of the actual pressure. Percentage accuracy Greatest difference between of full-scale reading indicated pressure and actual pressure, as a percentage of the range. Mean Sum of results divided by number of results. Absolute deviation Difference between a single result and the mean of several results Mean deviation Sum of the absolute deviations divided by the number of absolute deviations Standard deviation Commonly used value in analysis of statistical data 62 DATA SHEET 7 RELATIVE AND ABSOLUTE PRESSURE The measurement of any physical property relies upon comparison with some fixed reference point. Pressure is one such property, and pressure measurement must begin by defining a suitable fixed point. An obvious reference point is that of the ambient pressure of the surroundings. Pressure scales have been based around a zero point of the pressure of the atmosphere at sea level. Pressures lower than atmospheric are assigned negative values; pressures higher than atmospheric have positive values. Gauges for measuring pressure give readings relative to this zero point, by comparing the pressure of interest to the pressure of the surrounding air. Pressure measured with such a gauge is given relative to a fixed value, and is sometimes termed gauge pressure. Gauge measure pressure difference between the pressure to be measured and the barometric (ambient) pressure. This may then need adjusting, to take into account any difference between barometric pressure and the pressure at sea level. Many calculations using equations derived from fundamental physical laws require absolute pressure values. Absolute pressure is the pressure relative to a total absence of pressure (i. e. a total vacuum). On an absolute pressure scale, all pressures have a positive value. The following chart illustrates the difference between gauge pressure, barometric pressure, and absolute pressure. 63 DATA SHEET 8 TECHNICAL DATA The following information may be of use when using this apparatus: Operating range of dead-weight pressure calibrator Diameter of dead-weight calibrator piston Cross-sectional calibrator area of dead-weight 20 kN/m2 – 200 kN/m2 0. 017655 m 0. 000245 m2 20 kN/m2 150 mL Pressure produced in cylinder by mass of piston with no applied masses Approximate capacity of priming vessel 64 EXPERIMENT P1 CONCEPTS OF PRESSURE AND PRESSURE SENSOR BEHAVIOUR OBJECTIVE To gain a basic understanding of the concept of pressure and its measurement. To investigate the behavior of two kinds of pressure sensor, and the effect of damping on pressure measurement. †¢ To gain a basic understanding of the concept of pressure and its measurement. †¢ To investigate the behaviour of two kinds of pressure sensor †¢ To observe the effect of damping on pressure measurement METHOD To investigate the response of two kinds of pressure sensor to a pressure applied by a dead-weight calibrator device. To investigate the response of these sensors to the application of a sudden pressure spike, with varying levels of restriction of the liquid between the pressure application and the sensor. THEORY Pressure is the force exerted by a medium, such as a fluid, on an area. In the TH2 apparatus, pressure is exerted by a piston on a column of water. The pressure applied is then equal to the force exerted by the piston over the cross-sectional area of the fluid. The use of the piston and masses with the cylinder generates a measurable reference pressure, Pa: Pa = Fa A 65 where Fa = gMa, and Fa = force applied to the liquid, Ma = total mass (incl. piston), and A = area of piston. The area of the piston can be expressed in terms of its diameter, d, as: A = ? d2 4 The units of each variable must agree for the equations to be valid. Using SI units, Pa will be in Newtons per square metre (N/m? , also known as Pascals) if Fa is in Newtons, A is in square metres, and d is in metres. The use of specific units of pressure will be covered in exercise B. For this exercise the area of the cylinder is a constant. The pressure can therefore be considered directly proportional to the mass applied to the mass on the piston Pressure measurement is normally concerned with measuring the effects of a pressure differential between two points in a fluid. The simplest form of pressure sensor is a manometer tube, in which a tube of fluid is exposed at one end to the first point in the fluid, and at the other to the second point. Any pressure differential causes a displacement of fluid within the tube, which is proportional to the difference. Manometers (not included with the TH2 apparatus) are cheap, simple, and can be designed to cover a wide range of pressures. However, they are best used for measuring static pressures below about 600 kN/m? , as the required height of the fluid becomes unworkable at greater pressures. Their dynamic response is poor, so they are best suited to measuring static or slowly changing pressures. Some fluids used are toxic (such as mercury), and may be susceptible to temperature change. The Bourdon-type pressure gauge consists of a curved tube of oval cross-section. One end is closed, and is left free to move. The other end is left open to allow fluid to enter, and is fixed. The outside of the tube remains at ambient pressure. When fluid pressure inside the tube exceeds the pressure outside the tube, the section of the tube tends to 66 ecome circular, causing the tube to straighten (internal pressure lower than the ambient pressure conversely causes increased flattening, and the curve of the tube increases). A simple mechanical linkage transmits the movement of the free end of the tube to a pointer moving around dial. This type of gauge is one of the two kinds included in the TH2 apparatus. The second type of pressure gauge included as part of the TH2 is an electromechani cal device. In a basic semiconductor pressure sensor, silicon strain gauges are fixed to one side of a diaphragm. The two sides of the diaphragm are exposed to the two different pressures. Any pressure differential causes the diaphragm to expand towards the lower-pressure side, producing a change in the strain gauge voltage reading. The electronic semiconductor pressure sensor included with the TH2 is a more refined device with improved reliability and sensitivity for pressure measurement. It includes temperature compensation to reduce the effects of temperature variation on the results. The strain gauges used are formed by laying down a protective film of glass onto stainless steel, followed by a thin film of silicon. The silicon is doped to produce semiconductor properties, and a mask is photoprinted onto it. The unmasked silicon is then removed, leaving a pattern of silicon semiconductor strain gauges molecularly bonded onto the surface of the steel. The gauges are connected to an Ohmmeter through a Wheatstone bridge, to amplify the signal produced. 67 In this type of sensor, a diaphragm is still used, but instead of fixing the strain gauges to the surface, the deflection of the diaphragm moves a steel force rod. This transfers the force to one end of the steel strip that the semiconductor resistors are bonded to. The resulting deflection of the strip causes compression in some strain gauges, and tension in others, changing their resistance and producing a measurable output. Both the TH2 pressure sensors are set up to indicate the pressure differential between atmospheric pressure, and fluid pressurized with the use of the dead-weight calibrator. The fluid passes through a damping valve, positioned between the calibrator and the sensors. By partially closing the valve, fluid flow can be restricted. This affects the speed at which pressure is transferred from the point of application to the sensors. EQUIPMENT SET UP Level the apparatus using the adjustable feet. A circular spirit level has been provided for this purpose, mounted on the base of the dead-weight calibrator. Check that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable). Fully open the damping valve and the priming valve With no masses on the piston, slowly draw the piston upwards a distance of approximately 6cm (i. e. a full stroke of the piston). This draws water from the priming vessel into the system. Firmly drive the piston downwards, to expel air from the cylinder back towards the priming vessel. Repeat these two steps until no more bubbles are visible in the system. It may be helpful to raise the central section of the return tube between the manifold block and 68 the priming vessel. This will help to prevent air being drawn back into the system as the piston is raised. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, and then close the priming valve. PROCEDURE This equipment has been designed to operate over a range of pressure from 0 kN/m2 to 200 kN/m2. Exceeding a pressure of 200 kN/m2 may damage the pressure sensors. In order to avoid such damage, DO NOT APPLY CONTINUOUS PRESSURE TO THE TOP OF THE PISTON ROD WHEN THE PRIMING VALVE IS CLOSED except by application of the mass supplied. An impulse may be applied to the piston when operating at a fluid pressure of less than 200 kN/m2, as is described later in this procedure. Behavior of pressure sensors Spin the piston in the cylinder, to minimize friction effects between the piston and the cylinder wall. While the piston is spinning, record the angle through which the Bourdon gauge needle has moved, and the voltage output of the electronic sensor. Apply a ? kg mass to the piston. Spin the piston and take a second set of readings for the Bourdon gauge needle angle and the electronic sensor. Repeat the procedure in ? kg increments. When using several masses, it will be necessary to place the 2 ? kg mass on top of the other masses. Repeat the procedure while removing the masses again, in ? kg increments. This gives two results for each applied mass, which may be averaged in order to reduce the effects of any error in an individual reading. Effect of damping Apply a single mass to the piston, and spin it. While the piston is spinning, apply an impulse to the top of the piston by striking the top of the rod once, with the flat of the hand. Watch the behavior of the Bourdon gauge needle. Note the final sensor reading after the response settles. Slightly close the damping valve. Change the mass, spin the piston again, and apply an impulse to the rod. Observe any changes in the sensor responses. Repeat the procedure, closing the damping valve a little at a time and noting the response and the final sensor reading each time. RESULTS Tabulate your results under the following headings:- 69 Mass applied to calibrator Mm (kg) Deflection of Bourdon gauge needle (degrees) Output from electrochemical pressure sensor (mV) Notes on sensor behavior (damping) Plot a graph of sensor response against applied mass for each sensor. 70 EXPERIMENT P2 CONCEPTS OF PRESSURE MEASUREMENT AND CALIBRATION OBJECTIVE To convert an arbitrary scale of pressure sensor output into engineering units. To calibrate a semiconductor pressure sensor. METHOD To make use of a dead-weight calibrator in order to produce known forces in a fluid. THEORY It is recommended that students read Data Sheet 1: Relative and Absolute Pressures before proceeding with this exercise. Pressure sensor calibration Variation in a pressure sensor reading may be calibrated, using known pressures, to give a gauge reading in engineering units. From exercise A, the dead-weight calibrator used in the TH2 produces a known reference pressure by applying a mass to a column of fluid. The pressure produced is Pa = F Aa where Fa = gMa, and Fa is the force applied to the liquid in the calibrator cylinder. Ma is the total mass (including that of the piston) 71 g is the acceleration due to gravity, and A is the area of piston. The area of the piston can be expressed in terms of its diameter, d, as: A = ? d2 4 The pressure in the fluid may then be calculated in the relevant engineering units. These known pressures may then be compared to the pressure sensor outputs over a range of pressures. The relationship between sensor output and pressure may be turned into a direct scale, as on the Bourdon gauge scale. Alternatively, a reference graph may be produced. Where the relationship is linear and the sensor output is electrical, the sensor may be calibrated using simple amplifier (a conditioning circuit). When using SI units, the units of pressure are Newtons per square meter (N/m? , also known as Pascals). To calculate the pressure in N/m? , M must be in kg, d in m, and g in m / s?. For the pressure range covered in this exercise, it will be more convenient to use units of kN/m? , where 1 kN/m? = 1000 N/m? (1 N/m? = 0. 001 kN/m? ). Barometric pressure: pressure units and scale conversion Barometric pressures is usually measured in bar. One bar is equal to a force of 105 N applied over an area of 1m?. While bar and N/m? have the same scale interval, pressure in bar often has a more convenient value when measuring barometric pressure. Pressure may also be measured in millimetres of mercury (mmHg). The pressure is given in terms of the height of a column of mercury that would be required to exert an equivalent pressure to that being measured. Another possible unit of measurement is atmospheres (atm). One standard atmosphere was originally defined as being equal to the pressure at sea level at a temperature of 15 °C. A pressure unit still in everyday use is pounds per square inch (psi or lbf / in.? ). One psi is equal to a weight of one pound applied over an area of 1 in.? If a barometer is available to measure the ambient pressure in the room where the equipment is located, the barometer reading should be converted SI units. Pressures may be converted from one scale to another using a conversion factor. A list of conversion factors is provided below. 72 1 atm = = = = = = = = = = = = = = = = = = = = 101. 3 x 103 101. 3 1. 013 760 14. 696 100 x 103 100 0. 987 750. 006 14. 504 133. 3 x 103 133. 3 1. 33 1. 316 19. 337 6. 895 x 106 6. 895 x 103 68. 948 68. 046 51. 715 N/m2 kN/m2 bar mmHg psi N/m2 kN/m2 atm mmHg psi N/m2 kN/m2 bar atm psi N/m2 kN/m2 bar atm mmHg 1 bar 1 mmHg x 103 1 psi x 103 ADDITIONAL EQUIPMENT REQUIRED Values for the piston diameter and weight are provided. These may be replaced by your own measurements if desired. The following equipment will be required to do so: a) Vernier calli pers or a ruler, to measure the piston diameter b) A weigh-balance or similar, to measure the piston weight EQUIPMENT SET UP Carefully remove the piston from the cylinder, weigh it. Take care not to damage the piston, as it is part of a high precision instrument and any damage will affect the accuracy of the experimental results. Level the apparatus using the adjustable feet. A circular spirit level has been mounted on the base of the dead weight calibrator for this purpose. Check that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable). Open the damping valve and the priming valve. 73 With no masses on the piston, slowly draw the piston upwards a distance of approximately 6cm (i. e. full stroke of the piston). This draws water from the priming vessel into the system. Firmly drive the piston downwards, to expel air from the cylinder back towards the priming vessel. Repeat these two steps until no more bubbles are visible in the system. It may be helpful to raise the central section of the return tube between the manifold block and the priming vessel. This will help to prevent air being drawn back into the system as the piston is raised. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, and then close the priming valve. Set the selector switch on the console to ‘Output’. PROCEDURE This equipment has been designed to operate over a range of pressure from 0 kN/m2 to 200 kN/m2. Exceeding a pressure of 200 kN/m2 may damage the pressure sensors. In order to avoid such damage, DO NOT APPLY CONTINUOUS PRESSURE TO THE TOP OF THE PISTON ROD WHEN THE PRIMING VALVE IS CLOSED except by application of the mass supplied. Conversion of an arbitrary scale into engineering units Spin the piston to reduce the effects of friction in the cylinder. With the needle still spinning, record the angle indicated by the Bourdon gauge needle. Place a ? kg mass on the piston, and spin the piston. Record the value of the applied mass, and the angle indicated by the Bourdon gauge needle. Increase the applied mass in increment of ? kg. Spin the piston and record the needle angle each increment. Repeat the measurements while decreasing the applied mass in steps of ? kg. This gives two readings for each applied mass, which may be averaged to reduce the effect of any error in an individual reading. Calculate the applied pressure at each mass increment. Calculate the average needle angle at each pressure increment. Repeat the experiment, this time recording the applied mass and the indicated pressure on the Bourdon gauge scale. Compare this to the average needle angle recorded previously. 74 Calibration of a semiconductor pressure sensor NOTE: This procedure differs if the TH2-303 software is being used. Please refer to the online product Help Text if using this software. Spin the piston. Record the voltage indicated on the semiconductor output display on the console. Place a ? kg mass on the piston, and spin the piston. Record the applied mass, and the voltage indicated on the semiconductor output display on the console. Increase the applied mass in steps of ? kg, spinning the piston and recording the semiconductor output each time. Repeat the measurement while decreasing the applied mass in steps of ? kg. Calculate the applied pressure at each mass increment. Calculate the average sensor output at each pressure increment. Slowly open the priming valve. Open the valve to its maximum, and check that the damping valve is also fully open. The fluid in the system will now be at approximately atmospheric pressure (it will be slightly higher than atmospheric due to the height of fluid in the reservoir, but this is negligible compared to the range of the sensors). Switch the selector knob on the console to PRESSURE Turn the ZERO control on the console until the display read zero, to set the first reference point for the sensor calibration. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, and then close the priming valve. Place a large mass on the piston, and calculate the corresponding applied pressure. Spin the piston and adjust the SPAN control until the sensor output matches the applied pressure, to set the second reference point for the calibration. Remove the masses from the piston. Take a set of readings from the calibrated semiconductor sensor, by adding masses to the piston in ? kg increments. Repeat the reading while decreasing the applied mass. This gives two reading for each applied mass, which may be averaged in order to reduce the effect of any error in an individual reading. 75 RESULTS Tabulate your results under the following headings: Barometric pressure Mass of piston Mp Diameter of cylinder, d Cross-sectional area of cylinder, A Mass on piston Mm (kg) Applied mass Ma (kg) Applied force Fa (N) Applied pressure †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. Needle angle N/m2 kg m m2 Indicated Indicated SemiBourdon conductor semiconductor pressure pressure output Pb Ps Pa E ? (mV) (N/m2) (degrees) (N/m2) (N/m2) Plot graphs of average needle angle against applied pressure for the Bourdon gauge, and voltage output against applied pressure for the semiconductor sensor. Plot a graph of indicated pressure against actual pressure for the Bourdon gauge and the calibrated semiconductor pressure sensor. If there is facility for measuring barometric pressure, it is possible to calculate the absolute pressure corresponding to each applied pressure increment. The ambient pressure of the surroundings, Patm should be measured, then converted into N/m2 (if required). An additional column should be added to the results table: Absolute Pressure, Pabs (N/m2). Absolute pressure may then be calculated as Pabs = Pa + Patm 76 EXPERIMENT P3 ERRORS IN PRESSURE MEASUREMENT OBJECTIVE To investigate the sources of error when measuring pressure. METHOD Errors in measuring a quantity, such as pressure, can come from a number of sources. Some can be eliminated by careful choice of equipment and experimental method. Other errors are unavoidable, but can be minimized. In any experiment, it is good practice to note any possible sources of error in the results, and to give an indication of the magnitude of such errors. Errors fall into three general categories: Avoidable errors These are errors that must be eliminated, as any results including such errors will often be meaningless. Such errors include: †¢ †¢ †¢ †¢ Incorrect use of equipment Incorrect recording of results Errors in calculations Chaotic errors, i. e. random disturbances, such as extreme vibration or electrical noise that are sufficient to mask the experimental results. 7 Random errors Random errors should be eliminated if possible, by changing the design of the experiment or waiting until conditions are more favorable. Even if they cannot be eliminated, many random errors may be minimized by making multiple sets of readings, and averaging the results. Random errors include: †¢ †¢ †¢ †¢ Variation of experimental conditions (e. g. changes in ambie nt temperature) Variation in instrumentation performance Variation due to material properties and design (e. g. effect of friction) Errors of judgement (e. g. nconstancy in estimating a sensor reading) Systematic errors Systematic errors produce a constant bias or skew in the results, and should be minimized where possible. They include: †¢ †¢ †¢ †¢ Built-in errors (e. g. zero error, incorrect scale graduation) Experimental errors (due to poor design of the experiment or the apparatus) Systematic human errors (e. g. reading from the wrong side of a liquid meniscus) Loading error (errors introduced as a result of the act of measurement- for example, the temperature of a probe altering the temperature of the body being measured) Errors may also be described in a number of ways: Actual difference – the difference between the indicated value (the value indicated by the gauge or sensor) and the actual scale reading (the true value of the property being measured). The actual value must be known to calculate the actual difference. Accuracy – the maximum amount by which the results vary from the actual value. The actual value must be known. Percentage accuracy of the actual scale reading – the greatest difference between the actual value and the indicated value, expressed as a percentage of the actual value. The actual value must be known. Percentage accuracy of the full-scale reading (total range of the measurement device) – the greatest difference between the actual value and the indicated value, expressed as a percentage of the maximum value of the range being used. The actual value must be known. Mean deviation (or probable error) – The absolute deviation of a single result is the difference between a single result, and the average (mean) of several results. The mean deviation is the sum of the absolute deviations divided by their number. The actual value is not required. The mean deviation is an indication of how closely the results agree with each other. 78 Standard deviation (or mean square error) – the standard deviation is the square root of the mean of the squares of the deviations (‘better’ results are obtained by dividing the sum of the values by the one less than the number of values). This is a common measure of the preciseness of a sample of data- how closely the results agree with each other. The actual value is not required. ADDITIONAL EQUIUPMENT REQUIRED Values for the piston diameter and weight are provided. These may be replaced by your own measurements if desired. The following equipment will be required to do so: †¢ †¢ Vernier callipers or a ruler, to measure the piston diameter A weigh-balance or similar, to measure the piston weight EQUIPMENT SET UP To prime the cylinder, the following procedure should be followed (where this is required in the experiment): Level the apparatus using the adjustable feet. A circular spirit level has been mounted on the base of the dead weight calibrator for this purpose. Check that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable). Fully open the damping valve and the priming valve. With no masses on the piston, slowly draw the piston upwards a distance of approximately 6cm (i. e. a full stroke of the piston). This draws water from the priming vessel into the system. Firmly drive the piston downwards, to expel air from the cylinder back towards the priming vessel. Repeat these two steps until no more bubbles are visible in the system. It may be helpful to raise the central section of the return tube between the manifold block and the priming vessel. This will help to prevent air being drawn back into the system as the piston is raised. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, then close the priming valve. PROCEDURE This equipment has been designed to operate over a range of pressure from 0 kN/m2 to 200 kN/m2. Exceeding a pressure of 200 kN/m2 may damage the pressure sensors. In order to avoid such damage, DO NOT APPLY CONTINUOUS PRESSURE TO THE 79 TOP OF THE PISTON ROD WHEN THE PRIMING VALVE IS CLOSED except by application of the mass supplied. The following experiments give suggested ways in which particular sources of error may be investigated. It is recommended that only one or two be attempted in a single laboratory session, with each being repeated several times, giving multiple samples for the error analysis. Basic Error Analysis: The accuracy of the semiconductor calibration may be investigated by performing standard error calculations on the calibrated sensor output, using the results obtained in Experiment P2. If results are not available for analysis, the following procedure should be followed: Slowly open the priming valve. Open the valve to its maximum, and check that the damping valve is also fully open. The fluid in the system will now be at approximately atmospheric pressure (it will be slightly higher than atmospheric due to the height of fluid in the reservoir, but this is negligible compared to the range of the sensors). Switch the selector knob on the console to PRESSURE. Turn the ZERO control on the console until the display read zero, to set the first reference point for the sensor calibration. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, then close the priming valve. Place a large mass on the piston, and calculate the corresponding applied pressure. Spin the piston, and adjust the SPAN control until the sensor output matches the applied pressure, to set the second reference point for the calibration. Remove the masses from the piston. Take a set of readings from the calibrated semiconductor sensor, adding masses to the pan in ? kg increments, and again while decreasing the applied mass. This provides two set of readings for data analysis. The experiment should be repeated to provide further sets of data. Avoidable errors: Incorrect use of equipment Level the apparatus using the adjustable feet. A circular spirit level has been mounted on the base of the dead-weight calibrator for this purpose Check that the drain valve (at the back of the Bourdon gauge base) is closed, and the damping valve is fully open. 80 Remove the piston from the cylinder, then fill the priming vessel with water (purified or de-ionized water is preferable). Close the priming valve, then replace the piston in the cylinder. Take a set of readings without priming the system first. Random errors: Friction effects Prime the system as described in the equipment set up instructions. Tilt the board at an angle of about 5 to 10 degrees. THE EQUIPMENT BASE MUST STILL BE FIRM AND SECURE. Titling the apparatus in this way will exaggerate any friction effects, as the force applied by the piston will no longer be acting straight downwards on the column of fluids, but will have components acting at right-angles to cylinder wall. Spin the piston. Take one reading while the piston is spinning, then observe the behavior of the needle. Continue to watch the needle as the piston stops spinning, then make a note of the new gauge reading. Apply masses to the piston in ? kg increments. At each step, spin the piston, note the sensor output, and then take a second reading after the piston stops spinning. Systematic errors: Zero error Calibrate the semiconductor pressure sensor, but do not include mass of piston in the applied mass when calculating the applied pressure. Take a set of readings from the calibrated semiconductor sensor over a range of applied masses, now including the piston mass in the applied mass calculation. Human error Take a set or readings from the Bourdon gauge pressure scale, but stand at an angle to the dial face when taking each reading. Keep the same viewing angle for each reading. This illustrates the effect of parallax on the readings taken. RESULTS Tabulate your results under the headings on the following page: For each result, calculate the absolute difference, ea between indicated value Pi and the applied pressure Pa. 81 Find the maximum absolute difference, the accuracy ea max and use this value and the corresponding indicated pressure to calculate the % accuracy of actual scale reading and the % accuracy of full-scale reading (use a range of 200 kN/m2). Correlate the data for several test runs, to give a set of indicated pressure readings corresponding to a single applied pressure. Use this correlated data table to calculate the mean of the results, Pmean, the mean deviation, dm, the absolute deviation, da, and the standard deviation, ?. Errors can also be illustrated graphically: 85 Piston diameter, d = †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. m Piston mass, MP = †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. kg Experimental conditions : †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ Mass Applied Applied Applied Indicated Mean Absolute Standard Actual Accuracy % % Mean on deviation deviation deviation Accuracy Accuracy of mass force pressure pressure difference piston Actual Full result scale scale reading reading Mm dm da PI ea Emax e%a e%f Pmin Ma Fa Pa ? kg) (kg) (kN) (kN/m2) (kN/m2) (kN/m2) (kN/m2) (kN/m2) (kN/m2) 86 Plot a graph of actual pressure against indicated pressure. On the same graph, plot a straight line showing the actual pressure. This will illustrate three characteristics of the results: †¢ †¢ Deviati on of sensor readings from the actual value. Whether any deviation from the true reading is systematic (the graph will be a straight line or a smooth curve) or random (the graph will have no obvious relationship). Precision of the results. Precise results will be close together, not widely scattered. Precise results may still deviate strongly from the actual value. †¢