Monday, September 30, 2019
Araby â⬠James Joyce Essay
One of the most intriguing works by Irish writer James Joyce is ââ¬Å"Arabyâ⬠in which a young boy, who is the narrator, leads a carefree life in a Dublin neighborhood before falling in love with his friendââ¬â¢s sister. He is always watching her steps, every single morning. When they finally speak, the girl mentions the existence of an exotic bazaar in town, named ââ¬Å"Arabyâ⬠. The narrator then becomes obssessed with the idea of going to the bazaar to bring the girl a present. Nevertheless, disappointment is an important theme of the novel. The young boy is ultimately faced with reality when he goes to Araby and realizes that he cannot afford the things that are sold there. In others words, Joyce deals with the dichotomy of fantasy versus reality in ââ¬Å"Arabyâ⬠, giving it a rather pessimistic approach, where reality and its negativity prevail. In order to better comprehend Joyceââ¬â¢s ââ¬Å"Arabyâ⬠, it is important to understand the authorââ¬â¢s biography and the time in history in which ââ¬Å"Dublinersâ⬠was written. Joyce was born in a poor family in February of 1884. His father had several jobs and his mother was a devout Catholic. A young Joyce eventually moved to Paris, where he worked as a teacher and journalist, and later, during World War I, he took refuge in Zurich, Switzerland. Since Joyce spent great part of his adult life outside of Ireland, ââ¬Å"Dublinersâ⬠is written through the eyes of a ââ¬Å"refugeeâ⬠, as a member of Dublinââ¬â¢s society who is also an outsider. Through ââ¬Å"Dublinersâ⬠and its short stories, including ââ¬Å"Arabyâ⬠, Joyce describes life in Dublin, how religion influenced and dominated Irish society and how a national identity came to be. At that time, Ireland, a country that had suffered the horrors of the Great Famine in the past along with the death and emigration of millions of its people was now struggling culturally and politically to create its own identity and breakaway from British political control and cultural influence. The conflict between Catholics and Protestants was at its peak, as the entire island was under United Kingdomââ¬â¢s rule. In other words, Ireland and its society were going through a turbulent period in history, which affected Joyceââ¬â¢s use of language in ââ¬Å"Dublinersâ⬠as well as the themes cointained in his works, such as religion, the hardships of reality and Anglo-Irish relations. ââ¬Å"Dublinersâ⬠is a unique compilation of stories because it follows a chronological pattern. ââ¬Å"Arabyâ⬠falls in the category of ââ¬Å"childhoodâ⬠, because its narrator is a young boy and also due to the fact that one of its central themes is growth and maturity. In order for such growth to take place, ââ¬Å"Arabyâ⬠follows a clear sequence of events, which is described by William York Tindall in ââ¬Å"A Readerââ¬â¢s Guide to James Joyceâ⬠as ââ¬Å"illusion, disillusionment and coming to awarenessâ⬠(19). These three elements that result in the characterââ¬â¢s growth are well defined in the story. Manganââ¬â¢s sister and the bazaar both represent illusion. Disillusionment is present when the narrator goes to ââ¬Å"Arabyâ⬠and realizes that it is not what he had expected. Finally, disillusionment is shown in the end, when he comes to the conclusion that he is not able to buy Manganââ¬â¢s sister a gift, which in turn, leads to the final moment of epiphany, a concept that will be further discussed. Another essential aspect to ââ¬Å"Arabyâ⬠is the presence of images and symbols throughout the story, in particular those with religious conotations. Since religion and the church played an important role in Irish society and Joyce was Irish himself, religious themes are abundant in some of Joyceââ¬â¢s works, ââ¬Å"Arabyâ⬠being one of them. Religious imagery is present in the very beginning of the story, when the narrator mentions that the former tenant of the house where he lives was a priest. The house itself also contains religious symbol, in this case, in the garden: â⬠The wild garden behind the house contained a central apple-tree and a few struggling bushes under one of which I found the late tenantââ¬â¢s rusty bicycle-pumpâ⬠(373). It is evident that the apple-tree in the story evokes images of the Adam and Eve passage in the Bible, where they were tempted to eat the ââ¬Å"forbidden fruitâ⬠which was an apple. Manganââ¬â¢s sister, the ââ¬Å"objectâ⬠of the narratorââ¬â¢ affection, is perhaps the most significant religious symbol in the story. The narrator is devoted to her much like a religious person is devoted to God or a Saint. The connection between Manganââ¬â¢s sister and religious worship is shown in the passage where the narrator goes marketing with his aunt, while passing through the crowded and disorganized streets: I imagined that I bore my chalice safely through the throng of foes. Her [Manganââ¬â¢s sister] name sprang to my lips at moments in strange prayers and praises which I myself did not understand My eyes were often full of tears (I could not tell why) and at times a flood from my heart seemed to pour itself out into my bosom (179). The narratorââ¬â¢s feelings to Manganââ¬â¢s sister are so intense to the point of being compared to a religious experience. When he mentions Manganââ¬â¢s sister name in ââ¬Å"strange prayersâ⬠he is describing the powerful effect that she has on him, like the power of a prayer to a religious person. To the narrator, her name in the strange prayers has the same force as the name of Jesus or Mary in a traditional Catholic prayer. Cleanth Brooks, Jr. and Robert Penn Warren reinforce the link between the narratorââ¬â¢s desire and religion in their work, titled ââ¬Å"The Chalice Bearerâ⬠by affirming that ââ¬Å"(â⬠¦ ) when he [the narrator] speaks of his confused adoration, we see that the love of the girls takes on, for him, something of the nature of a mystic, religious experience. The use of the very word confused hints of the fact that romantic love and religious love are mixed up in his mindâ⬠(95). The narrator, thus, is yet to discover reality. He is still trapped in a world of illusion where the lines of pure, religious love and physical desire are somewhat blurred. The bazaar, called Araby, furthers the narrator into illusionment. The name of the bazaar evokes images of a far and exotic place: ââ¬Å"The syllables of the word Araby were called to me through the silence in which my soul luxuriated and cast an Eastern enchantment over meâ⬠(375). It can be argued that the bazaar also represents a religious symbol in the story. Such view is supported by William York Tindall: ââ¬Å"The Church, after all, is a more or less Oriental foundation, and the ecclesiastical suggestion of Araby (ââ¬Å"not some Freemason affairâ⬠) is supported by metaphorâ⬠(20). In other words, Araby can be regarded as a religious institution that takes over the life of the narrator. His anticipation of the visit to the bazaar becomes a focal point of his life, interfering with his everyday activities: ââ¬Å"I answered few questions in class. I watched my masterââ¬â¢s face pass from amiability to sternnessâ⬠¦ I could not call my wandering thoughts togetherâ⬠(375). The story ends with dissapointment and frustration when the boy arrives at the bazaar and realizes that most mof the stalls are closed, and even if they were open, he would not be able to buy Manganââ¬â¢s sister a gift. The narrator finally understands that life is harsh. In other words, ââ¬Å"Arabyâ⬠presents a moment of epiphany. Nevertheless, Joyce goes against the traditional concept of epiphany in ââ¬Å"Araby. â⬠Epiphany is usually associated with enlightment and positive growth whereas in ââ¬Å"Arabyâ⬠epiphany is linked with negativity. Such idea is supported by Florence L. Walzl in ââ¬Å"A Companion to Joycesââ¬â¢ Studies. She argues that: â⬠His [the narrator] inability to buy even a trinket for the girl and his perception of the inanity of the flirtation he has just witnessed climax in an epiphanic vison, not of light, but of darknessâ⬠(175). With such statement, Walzl acknowledges that the pattern of ââ¬Å"illusion, disillutionment and coming to awarenessâ⬠in the story comes ââ¬Å"full circleâ⬠. Instead of enlightment, the narratorââ¬â¢s epiphany causes him to become bitter: â⬠Gazing up into the darkness I saw myself as a creature driven and derided by vanity; and my eyes burned with anguish and angerâ⬠(377). Since religious symbols are a constant presence in the story, it has been argued that the narratorââ¬â¢s disappointment is, in reality, disappointment with the Church and the values that it represents. This position is shared by Florence Walzl in her conclusion of her analysis: At the narrative level, ââ¬Å"Arabyâ⬠manifests disillusionment in young love; at a symbolic level, it represents disillusionment in the theological virtue of charity. Faith, hope and love are diminished in this first triad of tales of childhood (176). In conclusion, ââ¬Å"Arabyâ⬠is a story of a young love. As such, it presents moments of illusion throughout most of the story. However, illusion is shattered by the narratorââ¬â¢s dark epiphany. A closer analysis of ââ¬Å"Arabyâ⬠reveals that there is more to the story than a young boyââ¬â¢s first love. The abundance of religious imagery shows the readers that the story is very much about criticism of the Churchââ¬â¢s role in the lives of the Irish people and its effect on a nation that was struggling politically to be free from the United Kingdomââ¬â¢s influence and ideologically, with the animosity between Catholics and Protestants.
Sunday, September 29, 2019
Colorism: Black People and African American Culture Essay
Colorism is a type of discrimination in which humans of the same race are treated or treat each other differently because of the social connotations that have been attached to shade of their skin. It exists in almost every race, but it is most predominant in the African American culture within the borders of The United States. Colorism in the United States is rooted back to slavery and ever since then it has corrupted the minds of the black community. Colorism between African Americans was no mistake; it was done purposefully to divide the African slave population to make them easier to control. A man by the name of Willie Lynch gave a speech in Virginia 1712 about how to control slaves. In this speech he stated, ââ¬Å"I use fear, distrust, and envy for control purposes. These methods have worked on my modest plantation in the West Indies, and it will work throughout the South. Take this simple little test of differences and think about them. On the top of my list is ââ¬ËAgeââ¬â¢, but it is there because it only starts with an ââ¬ËAââ¬â¢; the second is ââ¬ËColorââ¬â¢ or shade; there is intelligence, size, sex, size of plantations, attitude of owners, whether the slaves live in the valley, on a hill, East, West, North, South, have fine or coarse hair, or is tall or short. Now that you have a list of differences, I shall give you an outline of actionââ¬âbut before that, I shall assure you that distrust is stronger than trust, and envy is stronger than adulation, respect, or admiration. â⬠Willie Lynch was a smart man with a very insidious agenda that he flawlessly completed. He knew the power of distrust, he knew how to use it to his advantage, and he knew that all he had to do was plant the seed in to the minds of the slaves and it would grow and blossom all on its own and live for many years to come. From his speech stems the terms ââ¬Å"light skinnedâ⬠, ââ¬Å"dark skinnedâ⬠and ââ¬Å"good hairâ⬠. African American culture even today, three hundred years after this speech was given, is still being led to believe that having lighter skin in some way makes you a better than someone who has slightly darker skin. From the land that holds the famous motto ââ¬Å"All men are created equalâ⬠oddly is the same place where people of the same race discriminate against their own people. In ââ¬Å"The Color Complexâ⬠by Midge Wilson, she tackles the issue by tracking down the birthplace of colorism, ââ¬Å"To trace the origins of the color complex, we must return to the year 1607 when three ships sailed in Chesapeake Bay, stopping at Jamestown, Virginia, to establish the first English colony in the New World. . . . What might have been unthinkable in Europe and Africa was an everyday occurrence in the wilderness. Miscegenation, or race mixing, became widespread as Europeans, Africans, and Native Americans mixed their seed and substance to produce a kaleidoscope of skin tones and features. But these primary race groupings differed sharply in their civil liberties and political freedoms. Subtle variations in appearance took on enormous consequences in meaning, especially among Negros,â⬠(Wilson, pg. 9). The black community has let this issue open the doors for so much ignorance for hundreds of years. The effects of this have seeped into some of the most important organizations that delineate the black community, such as the NAACP, Jack and Jill, and renowned black Sororities and Fraternities.
Saturday, September 28, 2019
Causes and Effects of Smoking Essay Example for Free
Causes and Effects of Smoking Essay ââ¬Å"Smoking is bad for healthâ⬠. It is a very familiar slogan that you can easy to see in all pack of cigarettes and in public places. However, there is a fact that, despite knowledge about smoking damage, the number of people who smoke is increasing day by day. Smoking causes many negative effects than people think. It affects not only health but also environment and society. First, smoking affects health of both smoking person and people around him. There are many dangerous disease germs in tobacco, so that health of people who smoke is threatened a lot when they smoke. According to World Health Organization (WHO), there are 200 toxic chemicals per 4000 chemicals in tobacco, and in these 200 toxic chemicals, there are about 40 chemicals cause cancer such as nicotine, monoxide carbon, benzene, ammoniac, etc. These chemicals have bad effect on nervous system, blood vessel and are the main reason of heart disease, cancer, memory damage. A study of WHO also shows that each day, average 5 million people die because of tobacco and this figure could rise to 10 million by 2020 if countries donââ¬â¢t have effective solution to restrict smoking. In addition, smoke is easy to spread in the air, therefore not only smoking people but also people around them are affected. That mean, when a person smokes, he is harming both himself and many people especially children. These people are call ââ¬Å"passive smokingâ⬠people. Because immunize system of children doesnââ¬â¢t complete, they are easy to be affected by harmful factors from smoke. Thatââ¬â¢s why the threat of disease cause by smoke in children is higher than others. Some statistics in Vietnam show that about 60 -80 per cent children under 5 are affected by smoke. They are also easy to get some diseases like asthma, pneumonia, bronchitis if they usually contact with smoke. Smoking also has bad effect on environment. The tobacco manufacture releases an amount of waste including a lot of toxic chemicals such as oils, plastic, ethylene, glycol, nicotine, etc. These chemicals make water and soil as well as air in surrounding areas is contamination. In USA, tobacco manufacture is rank 18th in toxic industries. Each year, tobacco manufacture of the World releases about 300 million kilograms nicotine, one of toxic chemicals causes cancer and heart disease. Moreover, do you know that 95 per cent filter of cigarette made of plastic cellulose acetate? This chemical is very difficult to decompose and canââ¬â¢t recycle, so that it takes several years to disappear. In this time, this chemical may cause many effects on soil, water, even animal because some kind of birds and small animals confuse filter of cigarette as their food. Chemicals in cigarette filter make animals canââ¬â¢t digest and they may be killed by these chemicals. Not only health and environment but also society is affected a lot by smoking. First, smoking restrains economic development. Because of tax, tobacco is not cheap. In Vietnam, tax on tobacco is accounted of 45 per cent retail tax. It is supposed that a pack of cigarettes costs 10 thousand VND, so if a person smokes one pack a day; he has to pay 300 thousand VND a month for smoking. However, in fact, this is maybe much more money because some kinds of cigarette have higher price and with addicted people, a pack of cigarettes a day is not enough. For person got married, wasting a lot of money for smoking a month affects much on economics of family, especially poor family. Consequently, economics of a country cannot develop when economics of family doesnââ¬â¢t develop. In addition, another problem of smoking is medical burden. Smoking causes many diseases and also kills a lot of people. In Vietnam, each year, there are about 40,000 people die because of diseases related to tobacco. This figure is three times as much as people die because of traffic accident. Furthermore, each year, government has to spend a lot of money for health service in general and for treating diseases cause by tobacco in particular. In fact, expense for treating diseases cause by tobacco in Vietnam increases rapidly from 429, 8 billion in 2004 to 1160 billion in 2006, and in the future this expense maybe higher. It makes a big burden for government to solve smoking problem. There are not any benefits of smoking but serious effects in health, environment and society. Itââ¬â¢s very important for people to realize the danger of smoking and give up it. Thatââ¬â¢s why WHO choose the day 31/5 is World No Tobacco Day. All of us join together to make a world without smoke. Causes and Effects of Smoking. (2016, Dec 07).
Friday, September 27, 2019
Strategic Human Resources Management Assignment
Strategic Human Resources Management - Assignment Example ger responsibility requiring the involvement of different organizational capabilities is much higher than when recruitment is considered the sole responsibility of a small group of people hired for the purpose of administering recruitment activity. Armstrong (2009, p. 87) underscores that ââ¬ËNo single aspect of HR strategy should be considered in isolation. The links between one area and other complementary areas need to be established so that the ways in which they can provide mutual support to the overall strategy can be ascertained.ââ¬â¢ Burke describes the impact of incorporating Likertââ¬â¢s System 4 of Participative Group Management. This organizational decision led to internal habit changes and recruitment process changes. Top management representatives drove this organizational change and ensured active participation by the various departments. The recruitment process included observation of candidates in different situations and the decision of recruitment was given in the hands of the people who were to be worked with. The selection process included a feedback session with the candidate that explained the reason the candidateââ¬â¢s acceptance or rejection. (2002, p. 86) This experience highlights the need for an organizational view about the manner in which recruitment and selection processes should be designed, who alongside the recruitment function should be party to the process design and gauge system and manpower capabilities to sustain the processes. The recruitment function holds primary responsibility for the implementation of the process but organizational involvement is necessary to review contradictory practices and curtail unrealistic expectations. Industry performance, competitor action, customer expectation and shareholder satisfaction form the factors that determine the competitive advantage of the firm. Companies adopt hiring practices to suit the supply-demand situation of the labor market. The labor market, competitive industry practices
Thursday, September 26, 2019
Critical Issues in Globalisation Essay Example | Topics and Well Written Essays - 1750 words
Critical Issues in Globalisation - Essay Example Through evaluating its existing business situation, Marks and Spencer needs to review its market segmentation, share out its products to diverse target markets, and serve its clients efficaciously. Introduction Marks and Spencer is a worldwide company that spreads throughout Europe, Asia and North America. It sells footwear, clothing, food, house appliances and gifts. This paper will comprise three sections. Principally, it will evaluate the micro and macro environment of Marks and Spencer. Secondly, the paper will employ SWOT to evaluate the four facets of its business. Lastly, the paper will a draw an inference concerning the whole evaluation and provide the necessary recommendations. PEST Analysis The extensive external factors, which indirectly affect a company, comprise legal, political, social, economic and technological aspects. These frameworks will show how the macro environment influences M&S in formulating its marketing decisions. Legal and Political Environment It is very crucial for firms to adhere to government policies and global organisation structures such as the World Health Organisation, when formulating their marketing policies. Governments, particularly in the advanced countries, pay attention to the human and ecological environment life. Governments devise policies and systems to monitor companies and their products, for instance, energy saving strategies and genetically modified foodstuff regulation. The United Kingdom government has initiated energy saving policies such as climate change duty and Green Tariff on energy usage to reduce carbon dioxide and supplied subsidisations to enhance its policies. Marks and Spencer has instituted an incentive scheme in which stores can retain a 10% value of every savings they generate in its budget (Marks & Spencer 2012). This scheme aids Marks and Spencer in saving around 5 per cent of M&S energy. In current years, the gene technology has increased significantly. Some of the technology has been util ised to manufacture food. Nonetheless, some of the technology can bring about environmental pollution and jeopardise human health. Marks and Spencer declared that it would be stocking non-GM foods upon its shelves. Economic Economic aspects affect firms to either develop or retrench their business, for instance, loss-generating operations and their non-primary business operations. For example, the 9/11 misfortune in United States caused numerous firms to encounter depressions within Europe and North American countries. The 9/11 mishap in United States caused consumers to alter their purchasing habits and sales decreased tremendously. In fact, M&S lost about 8.6m pound worth of profits in 2001-2002 from its worldwide retailers. However, M&S has shut its deficit-generating operations within Continental Europe and sold out its non-core business within North America (Marks & Spencer 2012). Social Factors Buyersââ¬â¢ needs change incessantly. People desire to feel modern, special, and well situated. Therefore, people buy fashionable apparel and spend credit cards to fulfil their needs. M&S keeps up with the newest colour and style. Though it has high-ranking quality goods, M&S co. does not take into account the customersââ¬â¢ needs, particularly in clothing market (Marks & Spencer 2012). Technological Factors In the current era, information technology has be
State appeal courts Assignment Example | Topics and Well Written Essays - 250 words
State appeal courts - Assignment Example The decision making relies on the information recorded from other court proceedings (American Bar Association, 2004). This responsibility ensures justice prevails in the court system. The purpose of the courts is to ensure that the decision made in other court system is appropriate. Moreover, Hume (2009) is of the assumption that the state appeal courts ensure that all evidence available for a case are exhausted. The state appeal courts also analyze the decision process made for other courts. If the process is not clear and justified by legal provisions, the court may cancel the prior ruling made. The main purpose of the courts is to provide the final judgment of case. A case handled by the state appeal courts may be announced closed at the end of a trial. Different from other courts in the United States, the state appeal court make the final decision of a case. Its judgments cannot be appealed or challenged in other court
Wednesday, September 25, 2019
Financial issues Assignment Example | Topics and Well Written Essays - 250 words
Financial issues - Assignment Example The global financial crisis is one that has affected many companies. This has led to many changes with regard to the various regulations that exist. There is development in financial planning and the management of wealth (Elizabeth 1156). The article critically discusses this and shows the manner through which the global financial crisis of 2008 has led to trading of financial instruments. There is also the existent issue in modern days with regard to financial instruments that brings up the question of disclosure in the relevant industries and a case in example is what happens in Brazil mostly (Malaquias 95). Many companies do not seem to appreciate the value of privacy in an organization. In modern days, privacy is so poor such that financial statements of various debtors are portrayed to other people that attend to the same bank. Financial reporting is also important as some people fail to offer the important information that is necessary for financial instruments and planning. This information is such as the actual assets that the company or individual bears (Mark 3). It is important for these people to offer exact information to assist in the actual planning of a personââ¬â¢s or the investment of the company. Malaquias, Fernandes. ââ¬Å"Disclosure of financial instruments according to International Accounting Standards: empirical evidence from Brazilian companies.â⬠Brazilian Business Review, 2013: 10, 3. Pgs 82 ââ¬â 107. Elizabeth, Blankespoor. ââ¬Å"Fair Value Accounting for Financial Instruments: Does It Improve the Association between Bank Leverage and Credit Risk?â⬠Accounting Review, 2013, 88, 4. Pgs 1143 ââ¬â
Tuesday, September 24, 2019
How far is it true that representations of ethnic groups have no Essay
How far is it true that representations of ethnic groups have no alternative but to draw upon stereotypes because all language and concepts have to use previous - Essay Example Socialization provides individuals with resources necessary for acting and participating within their society. For the society, inducting all individuals and members into its social norms, attitudes, values, motives, social roles, language and symbols is the means by which social and cultural continuity are attained. Socialization on one hand prepares the individual for the roles the is to play, providing him with the necessary repertoire of habits., beliefs and values, the appropriate patterns of emotional response and the modes of perception, the requisite skills and knowledge. On the other hand, by communicating the contents of culture from one generation to the other, it provides for its persistence and continuity. Socialization is important in the process of personality formation. Much of the human components are the result of genes, the socialization process can influence particular formation by encouraging specific attitudes and behavior. Socialization practices vary markedly from society to society and the socialization practices are generally similar among people of the same society. People of the same society; with the same culture and of the same community are likely to share core values and perceptions. People generally socialize their children in remarkably similar ways to the way they themselves were socialized by their parents. Ethnicity comes as a result of a subjective belief on a common descent of similarities of physical type or customs or of both. It may also be as a result of memories of colonization and migration; this belief is important for group formation and it does not matter whether an objective blood relationship exists. Members of an ethnic group on the whole, claim cultural continuities over time ââ¬â same values, practices and norms. Ethnicity and race are related concepts in that both are usually defined in terms of shared genealogy. Ethnicity often
Monday, September 23, 2019
Description of 5 microbial diseases Essay Example | Topics and Well Written Essays - 1000 words
Description of 5 microbial diseases - Essay Example B. bifidum produces vitamins like B6, B9 and B12 ââ¬â a deficiency of these vitamins may lead to anemia. Bifidobacterium longum : Most of this bacteria is found in the colon but it also inhabits the stomach. It contributes to our organism by helping maintain equilibrium of intestinal flora, preventing intestinal tumors, and increasing the availability of food nutrients. Lactobacillus rhamnosus: This bacteria is known for its ability to survive under harsh conditions in the digestive system and urinary tract. It can help the organism fight against inflammation and infections by increasing virus and ââ¬Å"badâ⬠bacteria resistance. It is believed that L. rhamnosus helps the prevention of allergies and intestinal hypersensitivity. Bacillus coagulans: This gram-positive bacteria helps improve the vaginal flora, reliefs abdominal pain and bloating in people who suffer from Irritable Bowel Syndrome, and increases immune responses against viruses. Leprosy, also known as Hansens disease (HD), is a chronic intracellular bacterial infectious disease caused by a microorganism that mainly targets the skin and peripheral nerves. This disease has a sad past because people who had it were usually discriminated against and isolated from society. Today, however, it can be treated and cured. It is transmitted from one person to another. The contaminated germs can be expelled from one person through the mouth and inhaled by another individual, penetrating the nasal mucosa. The microorganism can also enter the body through open wounds in the skin. In this case, intimate and prolonged contact is necessary. That is why it is very important that family members of the individual diagnosed with leprosy be tested for the disease. The form that HD will be manifested will depend on the host immune response to the bacillus that causes the disease. Leprosy can be classified in five different forms from mild to severe: Indeterminate leprosy
Sunday, September 22, 2019
Steam Distillation of Eugenol Essay Example for Free
Steam Distillation of Eugenol Essay Introduction: This experiment involves an extraction of a natural product using the techniques of steam distillation. The principle component of oil of cloves is an aromatic compound, which is identified by thin layer chromatography (TLC). Eugenol is widely used in dentistry, due to its analgesic, antiseptic balsamic qualities. It is ideal for curative for pulp hyperemia (the soft, sensitive substance underneath the enamel and dentine of a tooth) and pulp its. In dentistry eugenol is also used to cover cavities, fill canals, etc. It also keeps food fresh and kills off bacteria and viruses. Eugenol helps keep meat fresh and prevents stomach upset, diarrhea, and wound infections. In addition, it might play a part in relieving indigestion, controlling diarrhea, and healing cuts and bites. Eugenol is the main active ingredient in cloves. Procedure: 1. In a 250 mL round bottom flask, place 10.0g of ground cloves and 80 mL of water. Set up for a simple distillation 2. Heat to boiling and collect the distillate until you no longer see droplets of organic liquid coming out of the condenser (about 40 minutes). 3. Place the distillate in a separatory funnel and extract with three 10 mL portions of Dichloromethane 4. Combine the dichloromethane extracts and dry over Sodium Sulfate. 5. Examine the purity of the extract using thin-layer chromatography (TLC). Spot a small sample of the extract using a capillary spotter about 1 cm from the end of TLC plate. 6. Visualize using a UV light and mark the visualized spots with a pencil. 7. Record the number of spots and the Rf values from the spot(s). 8. While the plate is developing set up a clean and dry distillation set up and distil off most of the dichloromethane solvent. 9. The remaining solution of Eugenol in Dichloromethane can be removed using a disposable pipette and placed into a clean pre-weighted vial. 10. The vial can be heated on a steam bath under the hood to remove the small amount of dichloromethane. 11. The pure Eugenol should be weighted to determine the percent oil recovered based on the mass of cloves originally used. Results: Density of Eugenol: 1.34 g/mL BP of Eugenol: 40Ã °C Initial mass of Eugenol: 18.545 g Mass of vial: 18.0063 g Mass of Eugenol Oil: 18.434 g % Recovery = (18.545 g 18.434 g)/18.434 x 100 = 0.602% Thin layer chromatography: Rf=(Distance substance moved/Distance solvent moved) Rf=(4.2/5.1) Rf=(.824) Conclusion: The experiment was successful in that we did isolate eugenol as proven by thin layer chromatography. Our Rf value was somewhat high. This is probably because the beaker with the chloroform was not 100 % closed during the time we did the thin layer chromatography. Our watch glass was not 100% efficient. Also when we were heating the liquid in the condenser, heating the liquid at a rate too high could cause excess materials to come out in the final product. Other than that, human error is a concern. This can be minimized by careful observation, and proper procedure. Still, our percent error was under 1 percent, which is very favorable.
Friday, September 20, 2019
Review of Copper Recovery Methods From Metallurgical Waste
Review of Copper Recovery Methods From Metallurgical Waste Apurva Patel, Prof. Nimish Shah Abstract: Copper is one of the most used metals in recent developments and demand of this red metal is increasing with passing of each day. Production of copper is 12 million tons per year and copper reserves are expected to run for 25 years with the estimated world copper reserves of 300 million tons. Recovery of copper from metallurgical waste is a trend that is being followed from beginning of industrial age and has many developments over a large time frame. Out of all the copper used in existing process, 2 million tons of copper is utilized with recycling of copper waste. India has limited copper ore reserve contributing about 2 percent of world reserves. We can say that copper has a large amount at our reserves but excavation is not as simple as it seems. Copper content in the raw mines is ranging from 0.5 to 1 percent. Even after recovery of copper there is large waste generated at the end of the process. Copper content in the waste is up to 0.3 percent at the discharge. Ultima tely around hundred times of waste is generated for recovery of one part of copper. That pushes forward the need of recycling copper from metallurgical waste to cater the need of increasing copper demand. Copper recovery from high copper containing metallurgical wastes like brass industries are generally dealt with smelting process. In such case large amount of energy is utilized to just melt down all the material. This process has a limitation of copper content i.e. if copper content is low then all the energy is utilized in melting of undesired material. Demand for electroplating of copper has increased significantly. Low efficiency or improper process handling causes remarkably high copper content in waste discharge, which is over the range of discharge criteria of heavy metals. So to control the increasing price of metals and to limit the use of fresh copper, recycling must be done so the recovery from waste also gives the advantage of being in range of the allowable government legislations. Though these hazardous heavy metals in electroplating waste having concentration high enough to give harmful impacts to environment but convincingly low concentration that is not enough to recover these metals effectively. In this paper, an overview of different methods for copper recovery is illustrated and justified the selection of different methods over different copper content of various sources. Keywordsââ¬â Copper extraction, Copper recovery, Electroplating, Recycling, I. INTRODUCTION Increasing demand of copper gives elevated chances for generating copper waste from different industries. There are thousands number of industries existing which includes utilization or processing of copper. In this paper, review of several most copper containing waste and most optimum copper recovery methods are described. Waste source is targeted which gives better possibilities of copper recovery and ease of operation. Several metallurgical source like; bronze scrap, copper converter slag, electroplating waste, and pickling solution is included in the study. II. Different copper source and recovery methods Recovery from copper slag There are different verities of slag produced from smelters for non-ferrous production. Major emphasis is given to copper slag as it has equal to or higher copper content compared to raw copper ore. Generation and utilization of copper slag has higher environment impacts compared to steel and iron slag as they contain remarkable quantity of heavy metals with higher solubility. Chemical composition of copper slag varies with different origins. Chemical composition is given as per work of Shen Forssberg in table 1. TABLE I Chemical composition of copper slag Elements (Percentage) Cu 0.6-3.2 Fe 32.7-37.3 SiO2 32.5-37.3 Al2O3 2.4-4.0 CaO 1.8-7.5 MgO 1.6-4.0 S 0.5-1.0 There are specific three methods to recover copper from copper slag; Floatation, Leaching and Roasting Floatation: Barnes has given industrial floatation process at Mount Isa Mines Limited to recover copper from copper slag. Grinding operation is applied until obtain the granular size of 80%- 74 à µm before floatation. Floatation is also feasible for magnetite present in the raw copper slag, so hydroxy ethyl cellulose is used in the process as a depressant of magnetite impurities. MIBC is used in the process as froather agent and sodium sec-butyl xanthate is used as a collector of copper from the waste. The result of this process gives concentrate grade copper with high percentage as 42.54%. Overall yield of such process is 82%. This experiment is observed for copper slag containing 3.7% copper. In this experiment most of Co is observed with floatation tail. Mainly, copper slag floatation is somewhat similar with sulfide ore floatation because of the fact that only metallic copper and sulfide minerals from the copper slag can only be effectively floated. In other slag copper is usually observed under oxide state and Co and Ni are also in oxide state because of its homogeneous distribution in the slag. So the stated method will not be utilized effectively with Co, Ni and oxide copper state. Therefore the span for the floatation process is reduced in size as less quantity of Co, Ni must be present in the slag or copper must not be in the form of oxide. Leaching: Basire and Anand described leaching thoroughly about its use and study over some leachants mainly hydrochloric acid, ferric chloride, ammonia, and sulfuric acid. In the initial era cyanide was also used but it was terminated because of its harmful effects to environment. Leaching is positively influenced by addition of H2O2, or leaching with Cl2/Cl system, or pressure leaching. Figure 1 shows effect of H2O2 on leaching of copper based on the experiments of Base metal recovery. Figure 1. Kinetics of copper recovery Graph showing metal recovery with highly oxidising agent like H2SO4 for copper slag. Experiment is carried out with 10% solid in solution and particle size less than 100 à µm. Experiment is carried out at 70 oC and pH maintained at 2.5 with applied H2O2 at 35 L/(h.t) Pressure leaching has broadly described by Anand, shows that with pressure leaching and use of dilute H2SO4 recovery of copper about 90% achieved from copper converter slag from the initial concentration of 4.03% Cu. Roasting: Roasting is actually one intermediate step which involves the process for converting the copper in desired form that can be easily separated from the raw material. After application of roasting, Leaching or floatation must be used to achieve desired separation. If we narrow down the process criteria then we can say a lot more specific term as sulfate roasting instead of roasting. In this process conversion of cupper cobalt ant nickel is taking place and transformed into more feasible soluble sulfates. Raw material is processed at 200-600 oC by addition of sulfide or sulfate agents. Then these soluble sulfates are dissolved in water and easily separated from slag. Some of the agents used in the process are, (NH3)SO4, H2SO4, H2S, pyrite etc. Sulfurization reactions are summarized as bellow. Cu2O + H2S à ¯Ãâà ³ Cu2S + H2O â⬠¦(1) 2Cu + H2S + à ½ O2 à ¯Ãâà ³ Cu2S + H2O â⬠¦(2) Sulfides of copper are then easily converted to soluble copper sulfate with roasting at 600oC. Ziyadanogullari used this method to treat copper slag containing 2.4% copper. By sulfurization in closed system with 140oC for 1 hour and then heating and roasting with 600oC for 360 minutes gives better result for recovery of copper up to 99.2%. Copper recovery from bronze scrap Bronze is the mixture of copper, lead and tin. Vast numbers of studies are going on as well as succeeded for recovering copper from brass scrap. Ludovicus produced black copper by reducing scrap at 1300oC after melting at 1180oC. After recovery of black copper oxygen gas is supplied in ample amount with a view to oxidize all metal impurities and obtained anode grade copper. Morsi and Rabah have studied different parameters for recovery of copper by melting the bronze scrap. They obtained bronze scrap which comprise of chips, turnings and pieces ranging from 1-5 mm in size from El-Maady Co. for Engineering Industries, Cairo, Egypt. Experimental work uses a computerized heating mechanism with silicon carbide-heated muffle furnace. With operating temperature of 1600oC slag generated contains tin and lead that is continuously skimmed off with a view to eliminate the possibility of joining the slag to molten copper. Slag generated from the process also has small copper content which is re covered by acid leaching to increase overall yield. Experiment is carried out by Morasi and Rabah at different temperatures and copper content with overall yield is measured at 15 and 30 minutes. Figure 2 Effect of temperature on obtained copper alloy Figure 2 enlightens the behavior of copper residue and composition of the same. Experiment is carried out at 1150oC, 1200oC, 1250oC and 1300oC and at time interval of 15 and 30 minutes. As we can see with increasing time recovery is increased but behavior of recovery is same. Overall yield is decreased with increasing time because more amount of metal is being dragged with slag formation. Removal of lead and tin from slag is favored by addition of copper sulfide with provision of air which convert impurities into sulfides and pushes forward the percentage amount of impurities into slag and increased recovery of copper in residue. Addition of 10-20 percent copper sulfide reduces up to 10 percent lead and 8 percent tin in copper residue. Recovery of copper is 96.2% with combination of acid leaching from the generated slag. Recovery of copper from pickling solution. Like every common metal, brass also has a tendency to corrode. Corrosion of brass takes place by contacting the outer surface to air. Corrosion of brass looks like black coating on the outer surface and it is called tarnish. This coating in non beneficial in any condition so it must be removed. Removal of corrosion includes dipping brass metal in dilute sulfuric acid solution, which is used for a long time before it finds its way to discharge. This utilization over a long period of time enriches the dilute solution with valuable metals such as copper, zinc, chromium etc. This heavy metal enriched mild acid solution is called waste pickle solution. Because of its environmental hazards it cannot be disposed off without removing toxicity. Recovery of copper is a coincidence that will make disposal waste under legislative limits and will provide economical benefit by recovering valuable metals. Pickling solution has a base of mild sulfuric acid and has the highest percentage around 45.1 g/L of H2SO4 in the same. It has around 25 g/L Zn and 35 g/L Cu(II), and other negligible impurities like chromium, iron and nickel. First using equal volume of TEHA (tri (2-ethylhexyl) amine) extractor acid is being removed with formation of immiscible layer over organic layer and can be easily removed from the mixture. Copper and zinc may be present in the sulfate form as no part of any metal is observed in the extracted acid and TEHA has less affinity towards sulfates of copper and zinc. This acid free pickle liquor is used with other extractors like Versatic 10 acid and Cyanex 272[bis-(2,4,4-trimethylpentyl)-phosphinic acid] for recovery of copper and zinc. Kerosene is used as diluents in the solvent extraction. pH of Versatic 10 acid and Cyanex 272 is having higher influence on extraction. Increasing Ph resulting in increment of metal extraction and at 5 pH and 30% Versatic acid concent ration all the copper is extracted. Whereas, zinc extraction is observed above pH 5 and is completely extracted in organic phase at pH 7.0. III. Copper recovery with electroplating With a specific type of waste that has copper in isolated pure form this technique can be used. A new idea is generated for separation of copper from waste like alloy waste brass industries waste, electrical waste etc. Tank is filled with electrolyte like zonax, copper sulfate etc. The idea is to provide continuous separation from raw material and to facilitate collection of nearly 100 percent pure copper. New type of vessel needs to be developed which has stainless steel base that can be acting like cathode and a receiver anode needs to be in center of tank. Outside walls must be made up of insulating material or at-least needs to have insulation over the wall to isolate human contact by accident during the process. Figure 3 electroplating for copper recovery Figure is showing the possible assembly of electroplating mechanism for semi continuous copper recovery. Copper in the raw material comes with contact of electric field applied across the length of the assembly. Copper in the electrolytic solution first separated and settled on anode. By this, copper-ion deficiency is generated in the solution. To mitigate the deficiency, copper from the raw material comes in to electrolytic solution and completes the chain reaction. Pure copper sulfate and zonax solutions are not conductors of electricity. For ease of operation pure water needs to be added to convert ions from the solution. Because of water addition now electrolytic solution has H+ ions and by getting enough electricity they will convert into hydrogen gas and applied electricity cannot be used efficiently. This apparatus can be operated within range of 2-12V. Above this range H2 will start to consume additional energy. Higher the applied amperes better the rate of deposition of copper from the raw material. Rate of deposition can be calculated by equation given by Michal faraday, i.e. W=(I.T.A)/(Z.F) where, W is the weight of copper deposited, I is the amount of current applied (amp), T is the amount of time for which current supplied, A is the atomic weight of substance, Z is vacancy and F is faraday constant 96,500 coulombs. For selection of electrolyte free electrons play vital role. General electrolyte as copper sulfate has higher efficiency for electroplating then zonax, but zonax is mono-valance electrolyte and less electricity is utilized for almost double copper extraction compared to copper sulfate. IV. Conclusion For efficient recovery of copper from various source first type of source and form in which copper is present must be determined. Floatation is not the most accurate and efficient method for separation of copper but it is widely used for primary separation of copper and for concentrating the raw copper for other applicable process like smelting. Leaching of copper is the most widely used and efficient copper removal process but it must be followed by electroplating of iron addition process to obtain pure copper. Some parameters like pH and temperature of leachant must be observed and needs to be carefully maintained. Roasting is also a two step process in which copper is converted to more feasible sulfate form and can be easily extracted by leaching. Bronze scrap has more copper content in the structure and needs to be carefully processed to obtain large number of copper content recovery up to 96% and other recovery by leaching from slag generated can increase the overall yield. Anot her phenomenon has been studied for pickling solution which has serious pollution problem at the disposal and economic problem at treatment. For treatment acid must be removed in the pretreatment and then copper along with valuable metals can be efficiently recovered with Versatic 10 acid. 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