Greek Literature and Archetypes Essays

Greek Literature and Archetypes Essays Greek Literature and Archetypes Paper Greek Literature and Archetypes Paper Essay Topic: Literature They next arrived at the country of the Cyclopes. The Cyclopes were giants who inhabited an island of which they were the only possessors. The name means round eye, and these giants were so called because they had but one eye, and that placed in the middle of the forehead. They dwelt in caves and fed on the wild productions of the island and on what their flocks yielded, for they were shepherds. Ulysses left the main body of his ships at anchor and with one vessel went to the Cyclopes island to explore for supplies. He landed with his companions, carrying with them a jar of wine for a present, and coming to a large cave they entered it, and finding no one within examined its contents. They found it stored with the richest of the flock, quantities of cheese, pails and bowls of milk, lambs and kids in their pens, all in nice order. Presently arrived the master of the cave, Polyphemus, bearing an immense bundle of firewood, which he threw down before the caverns mouth. He then drove into the cave the sheep and goats to be milked, and, entering, rolled to the caves mouth an enormous rock that twenty oxen could not draw. Next, he sat down and milked his ewes, preparing a part for cheese, and setting the rest aside for his customary drink. Then, turning round his great eye, he discerned the strangers, and growled out to them, demanding who they were, and where from. Ulysses replied most humbly, stating that they were Greeks, from the great expedition that had lately won so much glory in the conquest of Troy; that they were now on their way home, and finished by imploring his hospitality in the name of the gods. Polyphemus deigned no answer, but reaching out his hand seized two of the Greeks, whom he hurled against the side of the cave, and dashed out their brains. He proceeded to devour them with great relish, and having made a hearty meal, stretched himself out on the floor to sleep. Ulysses was tempted to seize the opportunity and plunge his sword into him as he slept, but recollected that it would only expose them all to certain destruction, as the rock with which the giant had closed up the door was far beyond their power to remove, and they would, therefore, be in hopeless imprisonment. Next morning the giant seized two more of the Greeks, and dispatched them in the same manner as their companions, feasting on their flesh till no fragment was left. He then moved away from the rock from the door, drove out his flocks, and went out, carefully replacing the barrier after him. When he was gone Ulysses planned how he might take vengeance for his murdered friends, and effect his escape with his surviving companions. He made his men prepare a massive bar of wood cut by the Cyclops for a staff, which they found in the cave. They sharpened the end of it, and seasoned it in the fire, and hid it under the straw on the cavern floor. Then four of the boldest were selected, with whom Ulysses joined himself as a fifth. The Cyclops came home at evening, rolled away the stone and drove in his flock as usual. After milking them and making his arrangements as before, he seized two more of Ulysses companions and dashed their brains out, and made his evening meal upon them as he had on the others. After he had supped, Ulysses approaching him handed him a bowl of wine, saying, Cyclops, this is wine; taste and drink after thy meal of mens flesh. He took and drank it, and was hugely delighted with it, and called for more. Ulysses supplied him once again, which pleased the gia nt so much that he promised him as a favor that he should be the last of the party devoured. He asked his name, to which Ulysses replied, My name is Noman. 1. Identify the archetypal situation represented in the excerpt from The Odyssey. Support your decision with details from the story. 2. which archetypal character fits the character of Polyphemos *best*? 3. identify the archetype represented by the character of Ulysses. Support your decision with details from the story. 4. What is the *best* choice to describe the purpose of this myth? 1. This passage is an example of the battle between good and evil. Ulysses and his men represent the good. They are weary travelers simply looking for a place to rest and expect the hospitality required by the gods. Instead, they are eaten and imprisoned by the villain, Polyphemus, who represents the evil in the world. He ignores the laws of the gods. 2. the Villain 3. Ulysses is an excellent example of the Hero archetype. He is brave, cunning, and risks his own life to save his men. 4. history The influence of ancient Greece can be seen in all of the following fields *except* religion Which archetype fits the character of Arachne *best*? the Outcast Identify the purposes of myth found in the story of Arachne and explain how it illustrates each purpose. The story of Arachne illustrates several purposes of myth. First, it demonstrates the power of the gods and the consequences of angering them, so one purpose is religious. It also illustrates a code of behavior that is acceptable in Greek society. They looked down upon those who have too much pride (hubris), so this myth illustrates the danger of that fault. Another purpose illustrated by Arachne is explaining natural phenomena. It tells the story of how spiders came to weave their webs. Finally, it is an entertaining story that fills the purpose of early literature. The Quest is a situational archetype found in many stories. Choose a story you know that is an example of this kind of archetype. Explain how it illustrates the Quest archetype. In the Quest archetype, a person or group is searching for someone or something. Generally, finding that person or thing will restore order in the society or cure someone. One example of a quest is illustrated by the story of Jason and the Argonauts and their search for the golden fleece. It was said to heal any wound and bring pece to the country that owned it. Which archetypal character is the enchantress in the story Rapunzel? the Wicked Witch *The Metamorphosis of the Dnieper, the Volga, and the Dvina translated by M.A. Ralston and W.R.S. Ralston* Which purpose of mythyology does this story fulfill? explanation of natural phenomena The story of Arachne, as told in the lecture, illustrates which of the purposes of mythology? ethics and behavior Homers, The Odyssey, is an ancient Greek poem about a man who goes on an epic journey home after years in captivity. This classic work *most likely* influenced the film O Brother, Where Art Thou?, about a man who escapes prison to find a treasure and reunite with his family. William Shakerpeares, Hamlet, *most likely* influenced the animated film The Lion King. *Read the myth of Hero and Leander.* 1. Which situational archetype fits the story *best*? 2. Which archetype fits the character of Hero *best*? 1. the Star-Crossed Lovers 2. the Ingenue *Hansel and Gretel* 1. What archetype fits the wife of this story *best*? 2. Which character represents the archetype of the Hero *best*? 1. the Wicked Stepmother 2. Hansel :

Senior Americans - Living Past 90 in the U.S.A.

Senior Americans - Living Past 90 in the U.S.A. Americas population of persons aged 90-and-older has almost tripled since 1980, reaching 1.9 million in 2010 and will continue to increase to more than 7.6 million over the next 40 years, according to a new report from the U.S. Census Bureau. If you think government benefit programs like Social Security and Medicare are financially strained now, just wait. In August 2011, the Centers for Disease Control reported that Americans are now living longer and dying less than ever before. As a result, people 90 and over now make up 4.7% of all people 65 and older, as compared with only 2.8% in 1980. By 2050, projects the Census Bureau, the 90 and over share will reach 10 percent. Traditionally, the cutoff age for what is considered the oldest old has been age 85, said Census Bureau demographer Wan He in a press release, but increasingly people are living longer and the older population itself is getting older. Given its rapid growth, the 90-and-older population merits a closer look. The Threat to Social Security A closer look to say the least. The great threat to the long-term survival of Social Security - the Baby Boomers drew their very first Social Security check on February 12, 2008. Over the next 20 years, more than 10,000 Americans a day will become eligible for Social Security benefits. Millions of these Boomers will retire, begin collecting monthly social security checks and go on Medicare. For decades before the Baby Boomers, about 2.5 million babies a year were born in the United States. Starting in 1946, that figure jumped to 3.4 million. New births peaked from 1957 to 1961 with 4.3 million births a year. It was that spurt that produced the 76 million Baby Boomers. In December 2011, the Census Bureau reported that the Baby Boomers had become the fastest-growing segment of the U.S. population. The inconvenient and unavoidable truth is that the longer Americans live, the faster the Social Security system runs out of money. That sad day, unless Congress changes the way Social Security works, is now estimated to come in 2042. The minimum age to begin receiving Social Security retirement benefits is 62. Medicare coverage, which covers about 80 percent of basic healthcare, begins automatically at age 65. Persons who wait until age 67 to apply for Social Security currently receive about 30 percent higher benefits than those who retire at 62. It pays to wait. 90 Not Necessarily the New 60 According to findings in the Census American Community Survey report, 90 in the United States: 2006-2008, living well into ones 90s may not necessarily be a decade at the beach.A majority of people 90 and over live alone or in nursing homes and reported having at least one physical or mental disability. In keeping with long-standing trends, more women than men are living into their 90s, but tend to have higher rates of widowhood, poverty, and disability than women in their eighties. Older Americans chances of requiring nursing home care also increase rapidly with advancing age. While only about 1% of people in their upper 60s and 3% in their upper 70s live in nursing homes, the proportion jumps to about 20% for those in their lower 90s, more than 30% for people in their upper 90s, and nearly 40% for persons 100 and over. Sadly, old age and disability still go hand-in-hand. According to census data, 98.2% of all people in their 90s who lived in a nursing home had a disability and 80.8% of people in their 90s who did not live in a nursing home also had one or more disabilities. Overall, the proportion of people age 90 to 94 having disabilities is more than 13 percentage points higher than that of 85- to 89-year-olds. The most common types of disabilities reported to the Census Bureau included difficulty doing errands alone and performing general mobility-related activities like walking or climbing stairs. Money Over 90? During 2006-2008, the inflation-adjusted median income of people 90 and over was $14,760, almost half (47.9%) of which came from Social Security. Income from retirement pension plans accounted for another 18.3% of income for persons in their 90s. Overall, 92.3% of people 90 and older received Social Security benefit income. In 2206-2008, 14.5% of people 90 and older reported living in poverty, compared to only 9.6% of people 65-89 years old. Almost all (99.5%) of all people 90 and older had health insurance coverage, mainly Medicare. Far More Surviving Women Over 90 than Men According to 90 in the United States: 2006-2008, women surviving into their 90s outnumber men by a ratio of almost three to one. For every 100 women between ages 90 to 94, there were only 38 men. For every 100 women ages 95 to 99, the number of men dropped to 26, and for every 100 women 100 and older, only 24 men. In 2006-2008, half of men 90 and older lived in a household with family members and/or unrelated individuals, less than one-third lived alone, and about 15 percent were in an institutionalized living arrangement such as a nursing home. In contrast, less than one-third of women in this age group lived in a household with family members and/or unrelated individuals, four in 10 lived alone, and another 25% were in institutionalized living arrangements.

Poverty in Haiti Essay Example | Topics and Well Written Essays - 1500 words

Poverty in Haiti - Essay Example During the last four years, there have been some positive changes like the restoration of political stability in 2006, the establishment of a better macroeconomic framework, the reduction of insecurity, and a slight economic growth (IMF, 2008:8). In spite of these positive signs, the country faces many challenges. In 2001, 4.4 million persons (56 percent of the total population of 8.1 million) were living below the extreme poverty line (US$1 per person, per day), and 7.6 persons out of 10 were poor (less than US$2 per person, per day) (IMF, 2008:8). At the same time, 40 percent of the poorest population only had access to 5.9 percent of total income, while 68 percent of this income belonged to the most affluent 20 percent of the population. (IMF, 2008:8). This means that 80 percent of the population was in control of only 32 percent of the total income. It has been calculated that 2 percent of the richest group in Haiti was in control of 26 percent of this income. (IMF, 2008:8). This is a clear picture of a high level of poverty and inequality. Besides that, Haiti fell from position 146 in 2000 to 153 in 2005 regarding the indicator of human development. There have been a gradual increase of deforestation, very low life expectancy at birth, and a deterioration in living conditions due to the annual average decline in real per capita income and average consumption. (IMF, 2008:8). Lack of education and the prevalence of ignorance and superstition keep many Haitians in a state of underdevelopment. For many Haitians survival is the most important issue that they face day by day. Both economic and human development have to be addressed with quick and effective solutions. 2.- Challenges Ahead. Challenges have to be identified accurately in order to tackle them in a proactive way. Haiti's Government and the International Monetary Fund (IMF) have been implementing the guidelines established in the Growth and Poverty Reduction Strategy Paper (DSNCRP) in which four key challenges have been identified: achieving more meaningful social development in order to overcome the lag regarding the Millennium Development Goals (MDGs), creating a modern, competitive economy to align Haiti with other Caribbean economies by rebalancing its competitiveness at the regional level, modernizing the State so it can really be at the service of all citizens by reshaping the public management system, and using at the fullest the country two comparative advantages (its cultural creativity and historical heritage, and the economic resources from the Diaspora). (IMF, 2008:9). Since poor Haitians struggle to survive desperately day by day, the most critical challenge of immediate survival must be consid ered as the highest priority problem to be solved in a viable, concrete way. 3.- Poverty

Answering the questions according to reading Essay

Answering the questions according to reading - Essay Example Gender, politics, and race intersect in producing repressive heteronormative gender relations. Lindsey Feitz and Joane Nagel explore the intersections of gender, war, and sexuality in â€Å"The Militarization of Gender and Sexuality in the Iraq War.† They assert that although the U.S. military employs more women in army operations nowadays, the same heteronormative relations are imposed on the latter. Feitz and Nagel add the complication of race, as sexuality and gender issues intersect. They talk about the example of the rescue of Private First Class Jessica Lynch, whose race and gender contrasted to those of her takers, where â€Å"American men [were] saving a pretty, young, white American woman from the possible sexual and personal assault by dark and dangerous Iraqis† (206). ... Gil Z. Hochberg presents heteronormativity that is more racial than sexual, although the causes and effects have gendered dimensions in â€Å"‘Check Me Out’: Queer encounters in Sharif Waked’s Chic Point: Fashion for Israeli Checkpoints.† Hochberg shows how checkpoints in West Bank and Gaza depict heteronormative exploitation. In his analysis, he asserts that checkpoints serve to â€Å"produce the Palestinian body both as a symbol of imminent danger (â€Å"the terrorist†) and as the object of complete subjugation lacking any political agency (â€Å"the occupied†)† (578). Because these checkpoints target both men and women, heteronormativity is depicted in a regional scale, wherein one male nationality controls and suppresses a different male and female nationality. Sex and gender become political arenas of power over those who are more powerless or those whom the dominant race wants to render powerless. The male gaze is an important ima ge of heteronormative sexuality production in several articles. How the heteronormative male sees women affects how they treat them. Feitz and Nagel indicate the role of gender in the male military gaze. Military personnel, for instance, continue to see military women in their stereotyped roles (Feitz and Nagel 204). Female soldiers continue to be embedded into the heteronormative aspirations of the military in specific and the American society in general. In â€Å"Securitizing Gender: Identity, Biometrics, and Transgender Bodies at the Airport,† Paisley Currah and Tara Mulqueen explore gender issues in the U.S. Transportation Security Administration’s (TSA) gender and biometrics practices. They describe that by using biometrics and comparing its results that to gender information, TSA’s programs

Juan Francisco Manzano, Autobiography of a Slave Assignment

Juan Francisco Manzano, Autobiography of a Slave - Assignment Example The inhumane punishments and oppressive events narrated in the biography and the orthography and unorthodox syntax in the original manuscript and the mysterious â€Å"disappearance† of his work during his lifetime all bear the scars of slavery. He started documenting his life events at the request of his mistress. This was possible since she had already taught him how to read and write. His original work never surfaced since. Juan Francisco Manzano lived in isolation as he was never allowed to play with other black children, but he led a relatively comfortable life and enjoyed some â€Å"freedom† as he was treated as a white child. Sometime later, Manzano worked as a slave where he almost lost his life. â€Å"I was putting the sugarloaf comes in one of the sheds toward †¦Ã¢â‚¬ ¦.. It was a huge piece of the roof with several beams that fell behind me, hitting the black Creole, Andres.† From the shock I fell through to the filter house below us,† (Manzano, pg. 99). The filter house was a large low building with a dark and an almost airless interior. Andres, unfortunately, did not survive as his skull was crushed, and the eyes almost popped out. Later on, rumors would reach Manzano’s second prompting him to urge young master Pancho to speak to his mother on Manzano’s behalf and get him from Dionisio where he worked in the sugar farm. This happened without much ado and he went to have  a  great life worth  enough food to eat. He was also bought a hat and some shoes something that was very new to him (Manzano, pg. 101). Although he was still a young buy, he would not go out to play with the other children even after such comfort. â€Å"I sank into such depression that I did not emerge from my sorrowful despondency, even after I saw all the children engrossed in games or when they called,† (Manzano, pg. 101) At the age of nineteen, Manzano took a certain pride of everything he did. His

Cutting Fluids and Lubrication in Manufacturing

Cutting Fluids and Lubrication in Manufacturing Importance Of Cutting Fluids And Lubrication In Manufacturing Processes 1. Introduction:- Cutting Fluids:- Cutting Fluid Management for Small Machining Operations iii Cutting fluids have been used extensively in metal cutting operations for the last 200 years. In the beginning, cutting fluids consisted of simple oils applied with brushes to lubricate and cool the machine tool. Occasionally, lard, animal fat or whale oil was added to improve the oils lubricity. As cutting operations became more severe, cutting fluid formulations became more complex. Todays cutting fluids are special blends of chemical additives, lubricants and water formulated to meet the performance demands of the metalworking industry. There are now several types of cutting fluids on the market, the most common of which can be broadly categorized as cutting oils or water-miscible fluids. Water-miscible fluids, including soluble oils, synthetics and semisynthetics, are now used in approximately 80 to 90 percent of all applications. Although straight cutting oils are less popular than they were in the past, they are still the fluid of choice for certain metalworking applications. Cutting fluids play a significant role in machining operations and impact shop productivity, tool life and quality of work. With time and use, fluids degrade in quality and eventually require disposal once their efficiency is lost. Waste management and disposal have become increasingly more complex and expensive. Environmental liability is also a major concern with waste disposal. Many companies are now paying for environmental cleanups or have been fined by regulatory agencies as the result of poor waste disposal practices. Fortunately, cutting fluid life may be extended significantly by implementing an effective fluid management program. The primary objective of fluid management is to maintain fluid quality and performance through administration, monitoring, maintenance and recycling practices. This allows machine shops to make the most cost-effective use of their fluid. It is also the best pollution prevention technology available. Overall, fluid management provides a means to: Operate in a more environmentally sound manner; Improve productivity and reduce costs; Increase competitiveness; Maintain environmental compliance and reduce environmental liability; Consistently manufacture quality products; and Provide a healthier and safer work environment for employees. Proper management of cutting and grinding fluids may also prevent them from being declared a hazardous waste at the end of their useful life. With increasing environmental regulation, a reduction in cutting fluid waste is an economical, practical and achievable goal. Cutting Fluids: (Lubricants + Coolants) Used in machining as well as abrasive machining processes Reduces friction wear Reduce forces and energy consumption Cools the cutting zone Wash away the chips Protect Machined surfaces from environmental corrosion  · The term â€Å"cutting fluids† is used to denote the coolants and lubricants that are used in metal machining and their allied operations like lapping, honing etc. Thin-wall milling of aluminum using a water-based cutting fluid on the milling cutter. Cutting fluids are various fluids that are used in machining to cool and lubricate the cutting tool. There are various kinds of cutting fluids, which include oils, oil-water emulsions, pastes, gels, and mists. They may be made from petroleum distillates, animal fats, plant oils, or other raw ingredients. Depending on context and on which type of cutting fluid is being considered, it may be referred to as cutting fluid, cutting oil, cutting compound, coolant, or lubricant. Every kind of machining (e.g., turning, boring, drilling, milling, broaching, grinding, sawing, shaping, planing, reaming, tapping) can potentially benefit from one kind of cutting fluid or another, depending on work piece material. (Cast iron and brass are usually machined dry. Interrupted cuts such as milling with carbide cutters are usually recommended to be used dry due to damage to the cutters caused by thermo shock). 2. Cutting Fluid Characteristics Functions Of Cutting Fluid The primary function of cutting fluid is temperature control through cooling and lubrication. Application of cutting fluid also improves the quality of the workpiece by continually removing metal fines and cuttings from the tool and cutting zone. Cutting Fluid Management for Small Machining Operations 2 Temperature Control Laboratory tests have shown that heat produced during machining has a definite bearing on tool wear. Reducing cutting-tool temperature is important since a small reduction in temperature will greatly extend cutting tool life. As cutting fluid is applied during machining operations, it removes heat by carrying it away from the cutting tool/workpiece interface . This cooling effect prevents tools from exceeding their critical temperature range beyond which the tool softens and wears rapidly . Fluids also lubricate the cutting tool or work piece interface, minimizing the amount of heat generated by friction. A fluids cooling and lubrication properties are critical in decreasing tool wear and extending tool life. Cooling and lubrication are also important in achieving the desired size, finish and shape of the work piece. No one particular fluid has cooling and lubrication properties suitable for every metalworking application. Straight oils provide the best lubrication but poor cooling capacities. Water, on the other hand, is an effective cooling agent, removing heat 2.5 times more rapidly than oil. Alone, water is a very poor lubricant and causes rusting. Soluble oils or chemicals that improve lubrication, prevent corrosion and provide Other essential qualities must be added in order to transform water into a good metalworking fluid. Removal Of Cuttings And Particulates A secondary function of metalworking fluid is to remove chips and metal fines from the tool/workpiece interface. To prevent a finished surface from becoming marred, cutting chips generated during machining operations must be continually flushed away from the cutting zone. Application of cutting fluid also reduces the occurrence of built-up edge (BUE). BUE refers to metal particulates which adhere to the edge of a tool during machining of some metals. BUE formation causes increased friction and alters the geometry of the machine tool. This, in turn, affects workpiece quality, often resulting in a poor surface finish and inconsistencies in work piece size. Metalworking fluids decrease the occurrence of BUE by providing a chemical interface between the machine tool and work piece. Cutting Fluid Properties In addition to providing a good machining environment, a cutting fluid should also function safely and effectively during machining operations. Corrosion Protection Cutting fluids must offer some degree of corrosion protection. Freshly cut ferrous metals tend to rust Rapidly since any protective coatings have been removed by the machining operation. A good Metalworking fluid will inhibit rust formation to avoid damage to machine parts and the work piece. It will also impart a protective film on cutting chips to prevent their corrosion and the formation of Difficult-to-manage chunks or clinkers. To inhibit corrosion, a fluid must prevent metal, moisture and oxygen from coming together. Chemical metalworking fluids now contain additives which prevent corrosion through formation of invisible, nonporous films. Compounds (such as amines and fatty acids) which form a protective coating on a metals surface, blocking chemical reactions. Passivating films are formed by inorganic compounds containing oxygen (such as borates, phosphates and silicates). These compounds react with the metal surface, producing a coating that inhibits corrosion. Management for Small 3 Cutting Fluid Stability/Rancidity Control In the early days of the industrial revolution, lard oil was used as a cutting fluid. After a few days, lard oil would start to spoil and give off an offensive odor. This rancidity was caused by bacteria and other microscopic organisms that grew and multiplied within the oil. Modern metalworking fluids are susceptible to the same problem. No matter how good the engineering qualities of a coolant, if it develops an offensive odour, it can cause problems for management. The toxicity of a fluid may also increase dramatically if it becomes rancid due to chemical decomposition, possibly causing the fluid to become a hazardous waste. Fluid rancidity shortens fluid life and may lead to increased costs and regulatory burdens associated with fluid disposal. A good cutting fluid resists decomposition during its storage and use. Most cutting fluids are now formulated with bactericides and other additives to control microbial growth, enhance fluid performance and improve fluid stability. Transparency And Viscosity In some operations, fluid transparency or clarity may be a desired characteristic for a cutting fluid. Transparent fluids allow operators to see the workpiece more clearly during machining operations. Viscosity is an important property with respect to fluid performance and maintenance. Lower viscosity fluids allow grit and dirt to settle out of suspension. Removal of these contaminants improves the quality of the fluid recirculating through the machining system. This can impact product quality, fluid life and machine shop productivity. Cutting Fluid Management for Small Machining Operations 4 3. Fluid Selection Oil-Based Fluids including straight oils, soluble oils and ag-based oils Chemical Fluids including synthetics and semisynthetics Fluids vary in suitability for metalworking operations. Petroleum-based cutting oils are frequently used for drilling and tapping operations due to their excellent lubricity while water-miscible fluids provide the cooling properties required for most turning and grinding operations. A. Oil-Based Cutting Fluids Straight Oils (100% Petroleum Oil) Straight oils, so called because they do not contain water, are basically petroleum, mineral, or age-based oils. They may have additives designed to improve specific properties. Generally additives are not required for the easiest tasks such as light-duty machining of ferrous and nonferrous metals. For more severe applications, straight oils may contain wetting agents (typically up to 20% fatty oils) These additives improve the oils wettability; that is, the ability of the oil to coat the cutting tool, workpiece and metal fines. They also enhance lubrication, improve the oils ability to handle large amounts of metal fines, and help guard against microscopic welding in heavy duty machining. For extreme conditions, additives (primarily with chlorine and sulfurized fatty oils) may exceed 20%. These additives strongly enhance the Antiwelding properties of the product. Soluble Oils (60-90% Petroleum Oil) Soluble oils (also referred to as emulsions, emulsifiable oils or water-soluble oils) are generally comprised of 60-90 percent petroleum or mineral oil, emulsifiers and other additives. A concentrate is mixed with water to form the metalworking fluid. When mixed, emulsifiers (a soap-like material) cause the oil to disperse in water forming a stable â€Å"oil-in-water† emulsion . They also cause the oils to cling to the workpiece during machining. Emulsifier particles refract light, giving the fluid a milky, Opaque appearance. ADVANTAGES. Soluble oils offer improved cooling capabilities and good lubrication due to the blending of oil and water. They also tend to leave a protective oil film on moving components of machine tools and resist emulsification of greases and slideway oils. Cutting Fluid Management for Small Machining Operations 6 Soluble oils are a general purpose product suitable for light and medium duty operations involving a variety of ferrous and nonferrous applications. Although they do not match the lubricity offered by straight oils, wetting agents and EP additives (such as chlorine, phosphorus or sulfur compounds) can extend their machining application range to include heavy-duty operations. Most cutting operations handled by straight oils (such as broaching, trepanning, and tapping) may be accomplished using heavy-duty soluble oils. B. Chemical Cutting Fluids Chemical cutting fluids, called synthetic or semisynthetic fluids, have been widely accepted since they were first introduced in about 1945. They are stable, preformed emulsions which contain very little oil and mix easily with water. Chemical cutting fluids rely on chemical agents for lubrication and friction reduction. These additives also improve wettability These compounds react with freshly-machined metal to form chemical layers which act as a solid lubricant and guard against welding during heavy-duty machining operations. Fluids containing EP lubricants significantly Reduce the heat generated during cutting and grinding operations. Synthetics (0% Petroleum Oil) Synthetic fluids contain no petroleum or mineral oil. They were introduced in the late 1950s and generally consist of chemical lubricants and rust inhibitors dissolved in water. Like soluble oils, synthetics are provided as a concentrate which is mixed with water to form the metalworking fluid. These fluids are designed for high cooling capacity, lubricity, corrosion prevention, and easy maintenance. Due to their higher cooling capacity, synthetics tend to be preferred for high-heat, high-velocity turning operations such as surface grinding. They are also desirable when clarity or low foam characteristics are required. Heavy-duty synthetics, introduced during the last few years, are now capable of handling most machining operations. Synthetic fluids can be further classified as simple, complex or emulsifiable synthetics based on their composition. Simple synthetic concentrates (also referred to as true solutions) are primarily used for light duty grinding operations. Complex synthetics contain synthetic lubricants and may be used for moderate to heavy duty machining operations. Machining may also be performed at higher speeds .inning Operations Synthetics are easily separated from the workpiece and chips, allowing for easy cleaning and handling of these materials. In addition, since the amount of fluid clinging to the workpiece and chips is reduced Disadvantages. Synthetic fluids are easily contaminated by other machine fluids such as lubricating oils and need to be monitored and maintained to be used effectively. Semisynthetics (2-30% Petroleum Oil) As the name implies, semisynthetics (also referred to as semi-chemical fluids) are essentially a hybrid of soluble oils and synthetics. They contain small dispersions of mineral oil, typically 2 to 30 percent, in a water-dilutable concentrate . The remaining portion of a semi-synthetic concentrate Semisynthetics are often referred to as chemical emulsions or preformed chemical emulsions since the concentrate already contains water and the emulsification of oil and water occurs during its production. Most semisynthetics are also heat sensitive. Oil molecules in semisynthetics tend to gather around the cutting tool and provide more lubricity. As the solution cools, the molecules redisperse. 4. Mechanisms Of Actions Cooling:- Metal cutting operations involve generation of heat due to friction between the tool and the pieces and due to energy lost deforming the material. The surrounding air alone is a rather poor coolant for the cutting tool, because the rate of heat transfer is low. Ambient-air cooling is adequate for light cuts with periods of rest in between, such as are typical in maintenance, repair and operations (MRO) work or hobbyist contexts. However, for heavy cuts and constant use, such as in production work, more heat is produced per time period than ambient-air cooling can remove. It is not acceptable to introduce long idle periods into the cycle time to allow the air-cooling of the tool to catch up when the heat-removal can instead be accomplished with a flood of liquid, which can keep up with the heat generation. Lubrication At The Tool-Chip Interface:- Besides cooling, cutting fluids also aid the cutting process by lubricating the interface between the tools cutting edge and the chip. By preventing friction at this interface, some of the heat generation is prevented. This lubrication also helps prevent the chip from being welded onto the tool, which interferes with subsequent cutting.  · Delivery Methods:- Every conceivable method of applying cutting fluid (e.g., flooding, spraying, dripping, misting, brushing) can be used, with the best choice depending on the application and the equipment available. For many metal cutting applications the ideal would be high-pressure, high-volume pumping to force a stream of fluid directly into the tool-chip interface, with walls around the machine to contain the splatter and a sump to catch, filter, and recirculate the fluid. This type of system is commonly employed, especially in manufacturing. It is often not a practical option for MRO or hobbyist metalcutting, where smaller, simpler machine tools are used. Active Cutting Oils:- Highly colourised mineral oil Normally black in colour with a pungent smell Oils at above discussed point, diluted with low viscosity mineral oil Lighter in colour. Light transparent mineral oil carrying sulphur or chlorine Light in colour and suitable for even severe cutting conditions. Light transparent mineral oil carrying sulphur or chlorine mixed with sulfurised and chlorinated or fatty oils or acids They find a common application. Inactive Cutting Oils:- The Inactive cutting oils are the straight mineral oils or straight mineral oils mixed with neat fatty oils, acids or sulfurised fatty oils. Among the fatty oils commonly used are lard oil, tallow and some fatty acids. Pastes Or Gels:- Cutting fluid may also take the form of a paste or gel when used for some applications, in particular hand operations such as drilling and tapping. Mists:- Some cutting fluids are used in mist (aerosol) form, although breathing such a lubricant in mist form is a severe and immediate health hazard. Present:- Kerosene, rubbing alcohol, and 3-In-One Oil often give good results when working on aluminium. Lard is suitable for general machining and also press tool work. Mineral oil WD-40 Dielectric fluid is the cutting fluid used in Electrical discharge machines (EDMs). It is usually deionised water or a high-flash-point kerosene. Intense heat is generated by the cutting action of the electrode (or wire) and the fluid is used to stabilise the temperature of the work piece, along with flushing any eroded particles from the immediate work area. The dielectric fluid is nonconductive. Liquid- (water- or petroleum oil-) cooled water tables are used with the plasma arc cutting (PAC) process. Past:- In 19th-century machining practice, it was not uncommon to use plain water. This was simply a practical expedient to keep the cutter cool, regardless of whether it provided any lubrication at the cutting edge-chip interface. When one considers that high-speed steel (HSS) had not been developed yet, the need to cool the tool becomes all the more apparent. (HSS retains its hardness at high temperatures; other carbon tool steels do not.) An improvement was soda water, which better inhibited the rusting of machine slides. These options are generally not used today because better options are available. Lard was very popular in the past. It is used infrequently today, because of the wide variety of other options, but it is still an option. Old machine shop training texts speak of using red lead and white lead, often mixed into lard or lard oil. This practice is obsolete. Lead is a health hazard, and excellent non-lead-containing options are available. From the mid-20th century to the 1990s, 1, 1, 1-trichloroethane was used as an additive to make some cutting fluids more effective. 5. Enviornmental Impact:- Old, used cutting fluid must be disposed of when it is fetid or when it is chemically degraded and has lost its performance. As with used motor oil or other wastes, its impact on the environment should be mitigated. Legislation and regulation specify how this mitigation should be achieved. Enforcement is the most challenging aspect. Modern cutting fluid disposal may involve techniques such as ultra filtration using polymeric or ceramic membranes which concentrates the suspended and emulsified oil phase. 6. Coolants:- A coolant is a fluid which flows through a device to prevent its overheating, transferring the heat produced by the device to other devices that use or dissipate it. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, and chemically inert, neither causing nor promoting corrosion of the cooling system. Some applications also require the coolant to be an electrical insulator. While the term coolant is commonly used in automotive, residential and commercial temperature-control applications, in industrial processing, heat transfer fluid is one technical term more often used, in high temperature as well as low temperature manufacturing applications. The coolant can either keep its phase and stay liquid or gaseous, or can undergo a phase change, with the latent heat adding to the cooling efficiency. The latter, when used to achieve low temperatures, is more commonly known as refrigerant. 1) Gases:- Air is a common form of a coolant. Air cooling uses either convective airflow (passive cooling), or a forced circulation using fans. Hydrogen, the first hydrogen-cooled turbo generator went into service with gaseous hydrogen as a coolant in the rotor and the stator in 1937 at Dayton, Ohio, by the Dayton Power Light Co, because of the thermal conductivity of hydrogen gas this is the most common type in its field today. Inert gases are frequently used as coolants in gas-cooled nuclear reactors. Helium is the most favored coolant due to its low tendency to absorb neutrons and become radioactive. Nitrogen and carbon dioxide are frequently used as well. Sulfur hexafluoride is used for cooling and insulating of some high-voltage power systems (circuit breakers, switches, some transformers, etc.). Steam can be used where high specific heat capacity is required in gaseous form and the corrosive properties of hot water are accounted for. 2) Liquids:- The most common coolant is water. Its high heat capacity and low cost makes it a suitable heat-transfer medium. It is usually used with additives, like corrosion inhibitors and antifreezes. Antifreeze, a solution of a suitable organic chemical (most often ethylene glycol, diethylene glycol, or propylene glycol) in water, is used when the water-based coolant has to withstand temperatures below 0  °C, or when its boiling point has to be raised. Butane is a similar coolant, with the exception that it is made from pure plant juice, and is therefore not toxic or difficult to dispose of ecologically. Very pure deionised water, due to its relatively low electrical conductivity, is used to cool some electrical equipment, often high-power transmitters. Heavy water is used in some nuclear reactors; it also serves as a neutron moderator. Cutting fluid is a coolant that also serves as a lubricant for metal-shaping machine tools. EX:-. Some fast breeder nuclear reactors. Sodium or sodium-potassium alloy NaK are frequently used; in special cases lithium can be employed. Another liquid metal used as a coolant is lead, in EX:- lead cooled fast reactors, or a lead-bismuth alloy. Some early fast neutron reactors used mercury. 7. Lubrication Lubricant:- A lubricant (sometimes referred to as lube) is a substance (often a liquid) introduced between two moving surfaces to reduce the friction between them, improving efficiency and reducing wear. They may also have the function of dissolving or transporting foreign particles and of distributing heat. One of the single largest applications for lubricants, in the form of motor oil, is to protect the internal combustion engines in motor vehicles and powered equipment. Typically lubricants contain 90% base oil (most often petroleum fractions, called mineral oils) and less than 10% additives. Vegetable oils or synthetic liquids such as hydrogenated polyolefin, esters, silicones, fluorocarbons and many others are sometimes used as base oils. Additives deliver reduced friction and wear, increased viscosity, improved viscosity index, resistance to corrosion and oxidation, aging or contamination, etc. Lubricants such as 2-cycle oil are also added to some fuels. Sulfur impurities in fuels also provide some lubrication properties, which have to be taken in account when switching to a low-sulfur diesel; biodiesel is a popular diesel fuel additive providing additional lubricity. Non-liquid lubricants include grease, powders (dry graphite, PTFE, Molybdenum disulfide, tungsten disulfide, etc.), teflon tape used in plumbing, air cushion and others. Dry lubricants such as graphite, molybdenum disulfide and tungsten disulfide also offer lubrication at temperatures (up to 350  °C) higher than liquid and oil-based lubricants are able to operate. Limited interest has been shown in low friction properties of compacted oxide glaze layers formed at several hundred degrees Celsius in metallic sliding systems, however, practical use is still many years away due to their physically unstable nature. Purpose:- Lubricants perform the following key functions:- 1) Keep moving parts apart 2) Reduce friction 3) Transfer heat 4) Carry away contaminants debris 5) Transmit power 6) Protect against wear 7) Prevent corrosion 8) Seal for gasses 9) Stop the risk of smoke and fire of objects General Composition:- Lubricants are generally composed of a majority of base oil and a minority of additives to impart desirable characteristics. Types Of Lubricants:- 1) Gas 2) Liquid including emulsions and suspensions e, natural water repellant) Water Mineral oils Vegetable (natural oil) Synthetic oils Other liquids 3) Solid 4) Greases 5) Adhesive 8. Use And Application Of Cutting Fluids:- Automotive Engine oils Petrol (Gasoline) engine oils Diesel engine oils Automatic transmission fluid Gearbox fluids Brake fluids Hydraulic fluids Tractor (one lubricant for all systems) Universal Tractor Transmission Oil UTTO Super Tractor Oil Universal STOU includes engine Other motors 2-stroke engine oils Industrial Hydraulic oils Air compressor oils Gas Compressor oils Gear oils Bearing and circulating system oils Refrigerator compressor oils Steam and gas turbine oils Aviation Gas turbine engine oils Piston engine oils Marine Crosshead cylinder oils Crosshead Crankcase oils Trunk piston engine oils 9. Components Of Fluid Management Program Administration:- Commit the personnel, equipment and other resources necessary for the program. Encourage employee support and participation. Designate fluid management personnel to implement the program. Survey the fluids, machines and sump capacities of the shop. Develop a record keeping system to track the program. Monitoring And Maintenance Prepare and mix the fluid according to manufacturers directions. Use quality water to dilute fluid concentrate and replenish evaporation losses. Monitor and maintain proper fluid concentration. Monitor for microbial contamination and control microbial growth through water quality control, maintaining proper fluid concentration and pH, routine maintenance of equipment, biocide additions and aeration. Monitor pH for signs of fluid degradation. Perform regular machining system inspections and maintenance practices, particulate removal, tramp oil control, general housekeeping and annual cleanouts. Prevent foaming with proper fluid concentration, quality water and eliminating mechanical effects that agitate cutting fluid. Recycle fluid well before it becomes significantly degraded. Never attempt to recycle rancid fluid. Select fluid recycling equipment based on the needs, objectives and financial resources of the shop. 10. Chemical Treatment:- Chemical treatment is the addition of chemicals which change the nature of the liquid waste. Simple chemical-treatment methods work well on some wastewater. Metalworking wastes are too complex for most treatment processes. Chemical treatment beyond pH control is generally not an option for small facilities. 11. Ultra Filtration System:- Ultra filtration systems were created for the metalworking industry to treat such wastes as used cutting fluids, detergents, parts-washing solutions, and other oily wastewaters. Strict environmental laws require proper treatment prior to discharge. Ultrafiltration systems provide effective treatment of this wastewater by separating the water from the oily waste. The quality of water is then ready for sewer disposal. <

Sex Essay -- Sociology Sociological Essays

Sex Humans are sexual beings. We want it. We all need sex. It is an important part of us. Sex can be simply a pleasurable act, yet it can also be an expression of our love for someone else. In short, sex is wonderful. However, it is relatively rare to encounter a rational discussion about sex, even between partners. As with all activities about which people are passionate and which involve biological drives, the topic of sexuality is rife with controversy, misunderstanding, moralizing, and stereotypes. It is my belief that the widespread availability of information about sexual matters help facilitate better communication in relationships. Progress can never be made in human affairs by the suppression or repression of information, or by spreading disinformation. In essence, sexuality should be celebrated to improve our sexual health and happiness. In today's society, where sex is unfortunately too often viewed as "the nasty," I would not necessarily call the act of having sex taboo because people are beginning to realize more about who we are and what we need. This is not to say that we are considering sex to be a cool thing now, but our attitudes are a lot better than they used to be. Still, we Americans have much to improve on our views and acceptance of sex. A non-virgin today is often looked down upon in the younger age groups (high-school and under). Teenagers label them with harsh vocabulary such as "whores", "skanks", "sluts", and "players." In the older age groups, sex is more "the thing to do". If you have a long-term girlfriend or boyfriend, wife or husband, it is expected that you are having a sexual relationship. We are more comfortable with admitting that we are sexually active when we are older. Ho... ...ts are there for us as mentors and friends who give us advice and direction. They should guide us and provide helpful information. For example, in the movie "American Pie", a father catches his son on the table "having sex" with an apple pie. He reacts in a polite way, understanding his son's burning curiosity, and suggests a few things to relieve his tensions, such as "stroking the salami." It's pretty funny if you think about it, but it's something that I would rather hear from my parents than scolding. I especially admire the father at the end of the movie, when the son is preparing for his prom. He says to his son, "be very very very careful.... when you put on.... the.... ccccccor-sage." That is just what we need today in every home. It would allow teenagers to talk to their parents openly about sex and opens new doors of sexual acceptance in America's future.