Climate And Ocean Acidification Carbon Dioxide Levels

Carbon dioxide levels in the atmosphere are higher than they have been in the past 400 thousand years, and they are steadily rising. In part, this is due to human impact. Carbon dioxide is a natural greenhouse gas and has been a part of Earth’s atmosphere for millions of years. CO2 levels are constantly fluctuating and have a large impact on the planet including a change in climate and ocean acidification. Multiple methods are used in deciphering CO2 levels of times past. Two proxies include ice cores and the ÃŽ ´18O compositions of marine foraminifera as resources in the determination of CO2 level information. Carbon dioxide in the atmosphere comes from many sources. Some of the most prevalent causes of CO2 levels in Earth’s atmosphere are the burning of fossils fuels, deforestation, and volcanic degassing. Fossil fuels are naturally formed fuels such as coal or natural gas that are formed by organic material such as plants. When fossil fuels are burned, the carbon tha t is locked in them is released into the atmosphere to bond to oxygen to form carbon dioxide. This CO2 has nowhere to go except into the air. There are some natural â€Å"sinks† that act as nets for greenhouse gasses. Forests and oceans are the largest sinks on the planet. CO2 is absorbed by plants to use for photosynthesis and when forests are cut down, the area available to take in CO2 excess decreases. The ocean can only hold so much CO2 and is currently holding approximately 1/3 of its’ limit. (Pickrell) VolcanicShow MoreRelatedClimate Change And Ocean Acidification Essay1692 Words   |  7 Pages Two major human-influenced activities impacting the health of our planet are Climate Change and Ocean Acidification- both phenomena degrading the health of living organisms and the global economy. And many see these issues through an unweighted lens- not recognizing just how big this issue is. Climate Change and Ocean Acidification are real issues that affect everyone on this planet, no matter your ethnicity, gender, or religion. These are issues that cannot be solved without a global effort andRead MoreThe Effects Of Climate Change On The Environment Essay1268 Words   |  6 PagesOCEAN ACIDIFICATION Smog, contaminated water, melting of snow packs. These are some of impacts that Climate Change has had on the Earth over the past years. All of these are product of the increase in carbon dioxide emissions by humans and their polluting activities. Since the Industrial Revolution, these events have escalated and, they have been becoming more noticeable and prolonged across the globe. Some of these events are more palpable and pronounced in certain parts of the hemisphere. For exampleRead MoreThe World Of The Great Barrier Reef873 Words   |  4 PagesAustralia is home to one of the most diverse and beautiful landscapes in the world. From uninhabitable arid deserts to snow-topped mountain ranges, lush tropical rainforests and gorgeous ocean beaches; it encompasses almost every type of environment possible. It is comparable in size to the United States and is home to nearly 20 million people (â€Å"Australia’s Geography and History†). Australia also includes some of the most unique species of animals and geographic phenomena found nowhere else inRead MoreOcean Acidification And Its Effects On Society944 Words   |  4 PagesOcean Acidification   Ã‚  Ã‚   As the sun comes out to represent a new day and the time passes, the world continues to turn nonstop. Everything is moving in a forward direction with no sense of looking back. Each and every day, we go on with our lives and daily routines not realizing what is happening to our planet Earth. The more we progress and expand in the world, then the more things we tend to lose sight of and overshadow that require our attention just as much. Over a course of the years, much ofRead MoreThe Effects Of Climate Change On Oceans1284 Words   |  6 PagesIn addition to carbon dioxide levels and surface temperatures, oceans also provide scientists with evidence of climate change. Oceans play a major role in climate change because they absorb almost all (90% from 1971-2010) of the energy increase in the climate system (â€Å"Summary†, 2013, p. 8). Scientists are confident that ocean surface temperatures have increased since the beginning of industrialization (â€Å"Summaryâ € , 2013, p. 8) and that humans have contributed to this ocean warming (â€Å"Summary†, 2013Read MoreHuman Impacts on the Environment677 Words   |  3 PagesHuman Impacts on the Environment: Ocean Acidification Ecological human effects on the planet are now about 40% greater than the planet can support in a sustainable fashion (Grossman, 2010). One of the many areas with significant damage is the marine biosphere. Ocean acidification is a great threat to marine and subsequently human life. The pH level in the ocean has been a relatively constant 8.15 to 8.25 and organisms have evolved under these circumstances for over 50 million years. HoweverRead MoreClimate Change Is Affecting Oceans1225 Words   |  5 PagesClimate change is affecting oceans tremendously. Threats faced by the ocean planet seem uncontrollable. In the face of overfishing, pollution, and climate change it may seem like a drop in the bucket. With the amount of light reaching onto the shore, plants should be reduced in order for the rising sea levels to fall. Oceans have also absorbed tons of carbon dioxide from the earth’s atmosphere causing ocean acidification. Coral bleaching is caused by high water temperatures leading to coral deathRead MoreOcean Acidification Is Destroying Our Environment1122 Words   |  5 PagesA July 6, 2015 Ocean Acidification: How the Ocean’s Declining pH is Destroying Our Environment Sometimes called â€Å"climate change’s equivalently destructive twin†, ocean acidification is becoming more and more noticeable as the seawater’s changing chemistry begins to cause environmental and economical problems. When the Industrial Revolution began around 1760, fossil fuel–powered machines gained an immense amount of accessibility and popularity. Since then, carbon dioxide (CO2) levels in the atmosphereRead MoreGlobal Climatic Changes Essay1271 Words   |  6 Pagesof heat trapping gases like carbon dioxide. The average earth’s temperature has risen by 1.4 ° F and it is also projected to rise about another 2-13.5 ° F in the coming decades. Large and potentially big shifts in weather and climate might result from small average weather conditions. Lot of places has seen changes in the form of floods, intense rainfall, frequent heat waves, droughts and improper rainfall distribution. These climatic changes left their impact on oceans and glaciers as well. GlaciersRead MoreGlobal Warming And Its Effects On The Great Barrier Reef1443 Words   |  6 PagesHow has Carbon Dioxide (CO2) levels frequently increased global warming and the massive increase of global ocean temperature which have risen from 0.74oC during the 19th century to 4oC in modern day society (NOAA, 2016), and how does CO2 contribute to one of the biggest tragedies seen on the Great Barrier Reef today, known as coral bleaching and what can be done to slow the increasing rate of this terrible tragedy? â€Å"Coral reefs are extremely important for biodiversity, providing a home to over 25%

Income and wealth Inequality in Australia Essay - 1101 Words

Inequality is present in every economy, but to what extent are income and wealth in Australia unequal and what government polices contravene income and wealth inequality? Income is defined as money that an individual or business receives in exchange for providing a good or service or through investing capital, while wealth is a measure of the value of all of the assets of worth owned by a person, community, company or country. Income and wealth inequality refers to the degree to which income is unevenly distributed among people in an economy. The share of total income received by different groups measures inequality, this visually represented in the Lorenz curve. The line of perfect equality bisects the graph with the percentage of income†¦show more content†¦This reveals that a relatively small proportion of households have high net worth and a large portion of households have low net worth, concluding with the simple statement that: The distribution of wealth is more unequal in Australia than the distribution of income. The disparities accounted for in the distribution of wealth and income tends to reflect wealth that is accumulated during a person’s working life and utilised during retirement. Whilst this sources the foundation of inequality, the distribution of income in Australia is influenced by socio-economic factors such as gender, age, occupation and ethnicity. Gender is a common inconsistency in various economies, during 2013 average weekly earnings for males were $1516 while females earned $1250, this is still coherent for males and females in the same occupational categories, and is augmented for opposite genders in different occupational categories. In terms of ethnicity, it has been recorded that persons born overseas earn more than persons born in Australia, that non-English speaking backgrounds earn less than English speaking backgrounds and the period of residence in Australia is proportional to the income earned. However, the lowest income earners in the Australian community a re Indigenous Australians and being heavily reliant on government welfare, earn a substantial loss in income compared to thatShow MoreRelatedPotential Solutions For High Youth Unemployment1005 Words   |  5 Pagessolutions for high youth unemployment in Australia be solved, and what are its implications on inequality for young Australians? I. Introduction High levels of unemployment have many negative effects, including rising inequality, which is a major issue in developed economies such as Australia (REF). Income, and wealth inequality are the two main types of inequality examined in economics. Income Distribution Income distribution refers to how the total income of a nation is distributed between theRead MoreEconomic and Social Costs of Inequality in Australia785 Words   |  4 Pagessocial costs and benefits of inequality in distribution of income in Australia. Income inequality describes the extent to which income is distributed unevenly among residents of an area. High levels of inequality indicate that a small number of people receive most of the total income, and that most people receive only a small share of the total. There are many advantages and disadvantages associated with the inequitable distribution of income. Income inequality can lead to an increase in theRead MoreInequality in Australia Essay1265 Words   |  6 Pagesmiddle income earners which are categorised as being in relative poverty. Relative poverty as defined by L. Kirkwood, I. Searle, T. Cronk, D. Cave and J. Swiericzuk as the situation of people whose income and lifestyle has fallen below, by more than a certain degree, the average income and lifestyle enjoyed by the rest of society. The upper and lower quintile is represented by 20 percent, however over the last two decades Australians are noticing a change in the gap between inequalities. In AustraliaRead Morewealth distribution, a social injustice1536 Words   |  7 Pages Is Wealth Distribution Today Just? In current times we often observe that many members of our society receive less than other members regardless of whether they are no less deserving. In contrast, there are some who have ownership over assets and earn income that they may not be deserving of. The distributive balance is upset and wealth distribution today can thus be seen as a social injustice. This injustice that is becoming more noticeable as people start to become aware of the facts, as weRead MoreIn Australia, a Persons Social Class Impacts Their Life Chances1698 Words   |  7 PagesIn Australia, a persons social class impacts their life chances. Critically evaluate this statement. Social class affects one’s life chance across a broad range of social occurrence from education achievement to health care to contact with the criminal justice system. This essay will argue that class has a remarkable impact on the life chances of an individual. It will further expostulate that high outcomes in academic performance in Australia is more prevalent on students from the high rankRead MoreThe Social Problems in Communities 1624 Words   |  7 Pages2007). Social problems differ from personal problems where issues are dealt with at an individual level. On the other hand, social problems may destroy values held collectively in a society. Social problems that occur in different societies include; inequality, unemployment, crime, poverty, drugs and substance abuse, illiteracy, religious extremism, immigration, political related violence and overpopulation. The investigations of social problems in the society often lead to sociological findings. TheRead MoreEssay on Class in Australia Today1059 Words   |  5 Pagesrelevant in Australia? To facilitate this question, the readings of Karl Marx, Fredrick Engels, Max Weber, Helen Marshall, R.W. Connell and T.H. Irving will be considered. Connell Irving (1992) identify ‘class structure’ in Australia with the ‘ruling class’ owning property/business, and the ‘working class’ in the way of labourers whom ‘act together in resistance to the capitalists’. This is relevant today in Australia with the privileged having majority of the power and wealth. Moreover, exploitationRead MoreJohn Stuart Mill And Income Inequality1721 Words   |  7 PagesMill and Income Inequality Many great economic thinkers throughout history has offered various differing yet interrelated views and ideas that may prove useful to the analysis of current issues in modern economics. A persistent issue in the modern economy is income inequality whereby the distribution of income among the population is unequal. This means that the gap between the rich and the poor increases over time if the issue is not appropriately addressed. In exploring the issue of income inequalityRead MoreDiscuss How Race and Ethnicity Perpetuate Inequality in Australia1192 Words   |  5 Pagesof ones race or ethnicity is not a factor. Bessant (2002) said racist attitudes are alive and well today. The concepts of ‘race and ‘ethnicity perpetuate inequality for people who are considered different from the dominant group. This essay will show how race and ethnicity are at a disadvantage to equally accessing resources in Australia, such as education, health, employment, housing and other life cha nces. The term ‘race is usually used to refer to specific groupings of people who shareRead MoreThe Hunger Games By Max Weber1437 Words   |  6 Pages Social stratification is a concept used within sociology that explains the divisions and social inequalities of large groups of people within a particular society. The Hunger Games (2012) is a film that demonstrates this through amplifying how the power of the rich members in a polarised society are taking control of the poor and separating them in different districts which create specific social rankings. This essay will use the perspective of conflict theory to examine how Australian society is

Legals of health care Free Essays

INTRODUCTION Medical Profession is ‘accountable’ to the society and obliged to the laws regulating the professional activity. Although in most of the medical litigations, the severity of the patient disability has been predictive in judgments in favor of the patients, negligence does have an impact on importance of high-quality medical care and doctor accountability in adverse medical events. The Court usually award three types of damages. We will write a custom essay sample on Legals of health care or any similar topic only for you Order Now 1.Compensatory damages – for an injured plaintiff’s economic losses, costs of health care and lost wages. 2. Compensatory damages – for non economic losses including pain, suffering associated to injury and 3. Punitive damages – in cases where a defendant (here, a doctor) has been found to have acted in a willful fashion, demonstrating negligence with no regard for the patient’s well being. Medical malpractice law is part of tort, or personal injury law. THE CASE STUDIES Adrian Bowe, 31, from Dearhem near Mary port in UK won  £3 million in damages – the reason – He suffered a massive stroke in April 2000 completely paralyzing him because his GP failed to refer him to a specialist for medical treatment. He needs professional medical care for the rest of his life and will not be able to work again. Mr.Bowe first went to the doctor complaining dizziness and blurred vision. The doctor incorrectly diagnosed a migraine and his diagnosis remained unchanged despite Mr.Bowe making further visits. A year after the consultation Mr.Bowe’s mother Patricia found him collapsed at his home. Subsequent tests revealed a massive stroke. In court, it was judged that the doctor should have referred Mr.Bowe to a neurologist based on his symptoms which were clear warnings of a stroke and was a strong case of wrong diagnosis . Edward Wilson filed a lawsuit against the Beverly Health Care center, West Virginia which was responsible for his wife Carol’s death in Jan 2004. He alleged that she died from sepsis due to multiple urinary tract infections she had developed due to poor infection control methods, during assisted toileting. The death of Nardia, 32, in Feb 2002 after a hysterectomy at Mater hospital has brought the senior surgeon under scrutiny although he was not excluded or cancelled from the Queens land Medical Board. Shahzadi Shahida Sultana, 35, Pakistan died after a 10 inch forceps was left out in her abdomen during a caesarean section. Two doctors were suspended after her relatives lodged a complaint against five women doctors in 2005. A private hospital in Milan, Italy, has been asked to handover for police verification of the medical records of at least twenty one cases who had heart valve surgery, following complaints that the surgeon replaced heart valves even in patients who did not need them replaced. A medical hospital has been pushed into a centre of a litigation storm after allegations of abnormally high death rate in its emergency wing. Thirteen deaths are under investigation now. This followed the anonymous complaints of sedation of terminally ill patients. Investigation has revealed an astounding 151 cases of sedation of which 57 cases had no informed consent of the family. A doctor has been suspended following the investigations for a series of ‘serious administrative errors’ in this regard (Waller, 2005). For the first time that an NHS trust had been prosecuted in UK following the death of the patient Mr. Phillips, admitted for a routine knee operation who developed Staphylococcal toxic Shock Syndrome (Dyer, 2006). REFERENCE Bosk, â€Å"Forgive and Remember: Managing medical failure†, Chicago University Press, Chicago, 1979. Bojan Pancerski, â€Å"British Medical Journal†, 332:382, 18 Feb 2006. Dyer Clare, â€Å"British Medical Journal†, 332:623, 18 March 2006. Waller stein Claire, â€Å"British Medical Journal†, 330:1044, 7 May. 2005. Dyer Clare, â€Å"British Medical Journal†, 332:135 21, Jan, 2006. http://www.medneg.com                How to cite Legals of health care, Essay examples

Social Work Singapore Social Problems

Question: Discuss about the Social Work for Singapore Social Problems. Answer: Singapore Social Problems and Government Philosophies Singapore has not had an easy path in its social development. Much like any other country in Asia, Singapore has had its fair share of problems related to social inclusiveness and social ills in its pre and post-independence periods. During the early years of social growth and development in Singapore, it was affected by many social ills. Pre-Independence Era (1960-1980) The first problems faced in the pre-independence years were the high rates of unemployment. The soaring unemployment was due to increased population and need for many industries to give jobs to especially the youths (Borrmann, Klassen, Spatscheck, 2007). Although, the unemployment rates were subsequently high, the industries had started to be put in place to help employ the youths. Insecurity potentially increased that led to muggings and rise in general petty thieving. The government had to set policies to improve the social and economic welfare of the people of Singapore. Marriage and divorce rates were not as high as compared to todays Singapore. Though a highly cultured society, where marriage is treasured and encouraged, many people married to follow mostly the heritage and cultures of their parents. Divorce was rare unless due to irreconcilable differences. In fact, divorce was seen as a taboo in the pre- independence periods of Singapore (Coulshed, Orme, 2012). To date, couples that married early in that period still hold hands together and are happy together. The healthcare systems were functional although many research and hospital centers were build post-independence era. Health was considered a great issue of national importance hence the government did a lot to make sure that health care was universal, free and accessible to all. Although the population was increasing most of the people in Singapore were helped by the social workers. Most of the emergency crisis and disaster situations were handled by mostly the social workers. They loved their jobs and were dedicated to the works. The role of Social Workers in crisis, emergency and disaster situations is based on three basic pillars. In the first place, we must be clear about the roles we can play within our professional role, secondly we analyze the situations in which we can intervene and, finally, the evaluation process and all its components. Post Independence Period With regard to the functions of Social Workers, after studying the functions of FITS (International Federation of Social Work) and our Code of Ethics in Singapore., we can summarize those functions that are characteristic of this type of events. Of course, all of them can be expanded, modified or supplemented by new ones that are required, so this table is a theoretical approximation of the functions we must defend. For better compression, they have been divided according to the temporal moment (reemergence, impact, and post emergence) (Johnson, 2009); And also on the basis of the beneficiaries of our intervention (affected, family, community, interveners) and finally a national level on organizational and management issues in management bodies. Social workers today do the following; Contribute to reduce inequalities and social injustices. Make known the opportunities that social groups have at their disposal. Motivate to access those opportunities. To help individuals, families and social groups to develop the emotional, intellectual and social responses necessary to enable them to take advantage of these opportunities without having to give up their personal, cultural and origin traits. Help people involved in managing feelings and emotions to learn to express them explicitly. Helping people to learn new ways of facing problems, conceiving life differently Restore the psychological balance of people. Establish or facilitate communication between people in crisis, and with people who can help in the process. Help the individual or family to properly perceive the situation. Restore the homeostasis of the individual with their environment that has been affected by the critical event. Problems in the early years and the issues now, and a comparison to modern Singapore The problem was immense but also there were difficulties of addressing it, even though it appears obvious to the public. This issue confronts us with a new treatment of the "social question" in the direction of reflecting on the rupture of social ties, the loss of social cohesion, particularly in societies with integration deficits and persistent loss of "organic solidarity" (Payne, n.d.). Along with this the type of social development changes; There is acceptance of inequality and "the notion of equality has been replaced by that of equity (which is a part of equality), the social agenda has been divided and expanded to include issues such as extreme poverty, gender equity , Race, ethnicity, among others. " Poverty, Vulnerability and Exclusion The concept of poverty, which has supported most of the work on the subject in the last two decades, is understood as a lack and refers to a state of deterioration, a situation of impairment that indicates both an absence of essential elements For subsistence and personal development as an insufficiency of the tools necessary to abandon that position.. As a result there is talk of structural poverty, impoverished, income poor; These distinctions mark some characteristics of those who are in this condition and in any case show that the former, regardless of income at the time of measurement, have historically had difficulties in reaching minimum levels of family accumulation. with research centers and council for social services, the government has set policies in order to raise awareness on social ills bedeviling Singapore. Policies such us equal rights to marginalized communities like women and the LGBT have been put in place. The government had to set policies to improve the social and economic welfare of the people of Singapore. The ministry of social work and family awareness has helped in educating young couples on how to avoid conflict in their marriages and avoid divorces (Runcan, Rat?a?, Cojocaru, 2013). These have been through social awareness and education. Policies such as health improvement and proper research have led to reduced social ills in Singapore. Social workers are well remunerated making this one of the best counties on social welfare issues in the world. However, major improvement need to be put in place by the ministry to ensure a well-rounded social justice country. References Borrmann, S., Klassen, M., Spatscheck, C. (2007). International social work. Opladen: Barbara Budrich Publishers. Coulshed, V., Orme, J. (2012). Social work practice. Basingstoke: Palgrave Macmillan. Johnson, R. (2009). In a good place. New York: Touchstone. Lawrence, S., Lyons, K., Simpson, G., Huegler, N. (2010). Introducing International Social Work. Exeter: Learning Matters Ltd. Payne, M. Modern social work theory (1st ed.). Raheem, K. (1993). Problems of social security and development in a developing country. Jyva?skyla?: University of Jyva?skyla?. Runcan, P., Rat?a?, G., Cojocaru, S. (2013). Applied Social Sciences. Newcastle upon Tyne: Cambridge Scholars Publishing.

Delving Into Computer Crime Essays - Cybercrime, Hacker, Hacking

Delving Into Computer Crime White-collar crime, specifically computer crime, is becoming more popular as computers become more readily available. Crimes using computers and crimes against computers are usually committed without fear of being caught, due to the detachment of the offender from the victim. Computer crime is defined as, Criminal activity directly related to the use of computers, specifically illegal trespass into the computer system or database of another, manipulation or theft of stored or on-line data, or sabotage of equipment and data.(1). This includes both crimes using computers and crimes against computers. The people who commit these crimes are of a wide variety. Cyber-criminals can be put in generally seven categories: ? Pranksters: These individuals perpetrate tricks on others. They generally do not intend any particular or long-lasting harm. A large portion is juvenile. ? Hackers: These individuals explore others' computer systems for education, out of curiosity, to achieve idealized social justice, or to compete with their peers. They may be attempting to gain the use of a more powerful computer, gain respect from fellow hackers, build a reputation, or gain acceptance as an expert without formal education. ? Malicious hackers (crackers): These individuals are intent on causing loss to satisfy some antisocial motives or just for fun. Many computer virus creators and distributors fall into this category. ? Personal problem solvers: By far the most common kind of criminal, these individuals often cause serious loss in their pursuit of a solution to their own personal problems. They may turn to crime after conventional problem-solving methods fail, or they may see crime as a quick and easy way to solve their problems. They generally believe that the victim of the crime is rich enough to afford the loss and would not miss what was taken or used. Disgruntled employees, angry about being fired or not receiving a raise they felt they deserved, have also been known to even the score with their company by disrupting their computer networks or program functionality fall into this category(7). ? Career criminals: These individuals earn part or all of their income from crime, although they do not necessarily engage in crime as a full-time occupation. Some have a job, earn a little and steal a little, then move on to another job to repeat the process. In some cases they conspire with others or work within organized gangs such as the Mafia. The greatest organized crime threat comes from groups in Russia, Italy, and Asia. The FBI reported in 1995 that there were more than 30 Russian gangs operating in the United States. According to the FBI, many of these unsavory alliances use advanced information technology and encrypted communications to elude capture.(7). ? Extreme advocates: Better known as computer terrorists, these individuals and groups have strong social, political, or religious views and are intent on changing conditions by engaging in crime. Their crimes usually involve violence against people or property and are calculated to achieve a high level of publicity to bring attention to the terrorists' causes. To date, terrorists have rarely engaged in cyber crime, although the Red Brigades in Europe came close by destroying more than 60 computer centers during the 1980s. Terrorist groups, especially the highly organized ones sponsored by rogue countries such as Libya and Iran, are likely to turn their attention to our fragile information, utility, and transportation infrastructures when their current methods lose their impact.(7). Such groups could plan an attack on a worldwide basis, using cryptography to communicate, and then carry out their acts through the Internet. ? Malcontents, addicts, and irrational and incompetent people: These individuals extend from the mentally ill to those addicted to drugs, alcohol, competition, or attention from others, to the criminally negligent. In general, they are the most difficult to describe and the most difficult to protect against. We have no way of determining who is sufficiently irrational to trigger an attack against an organization or individual because of a perceived affront. We also have no way of predicting negligence. Criminal negligence is common in the abuse and misuse of computers. Programmers in New Zealand, for example, were convicted of criminal negligence when they failed in their duty to inform the captain of an airliner that they had reprogrammed his navigation system.

Extended Metaphor in Literature

Extended Metaphor in Literature An extended metaphor is a common literary device used as a comparison between two, unlike things that are commonly used in descriptive prose or poetry. Sometimes, it is just a sentence or two, or sometimes it can be even longer, lasting a paragraph or more. This literary term is also known as a conceit or a mega-metaphor. An extended metaphor is sometimes confused with allegory. The various elements or  images  in an extended metaphor may fit together or complement one another in different ways. Allegory Versus Extended Metaphor Allegory is often described as an extended metaphor, but this description only works if extended refers to the linguistic expression while metaphor refers to the conceptual structure. For example, Peter Crisp, English professor for the Chinese University of Hong Kong, claims that Extended metaphor... is different from allegory because it contains language that relates directly to both the  source and target. Literary Construct Only Extended metaphors  are a literary construct as opposed to an ordinary-language  metaphor. Extended metaphors are used consciously and sustained throughout a text or discourse. Unlike ordinary-language metaphors, they are not a one-off use of a description usually made out of necessity to get a point across. According to some language experts, extended metaphors are the exclusive property of literary texts, although this is not conclusive because of the use of  sustained metaphors in advertising. Examples of Extended Metaphors The best way to understand the concept of an extended metaphor is to see it in use. Authors and poets from all over the world, from all genres, and many time periods, have used or likely will use an extended metaphor in one way or another. Dean Koontz, Seize the NightBobby Holloway says my imagination is a three-hundred-ring circus. Currently, I was in ring two hundred and ninety-nine, with elephants dancing and clowns cartwheeling and tigers leaping through rings of fire. The time had come to step back, leave the main tent, go buy some popcorn and a Coke, bliss out, cool down.Michael Chabon, The Yiddish Policemans UnionIt never takes longer than a few minutes, when they get together, for everyone to revert to the state of nature, like a party marooned by a shipwreck. That’s what a family is. Also the storm at sea, the ship, and the unknown shore. And the hats and the whiskey stills that you make out of bamboo and coconuts. And the fire that you light to keep away the beasts.Emily Dickinson, Hope Is the Thing With FeathersHope is the thing with feathersThat perches in the soul,And sings the tune- without the words,And never stops at all,And sweetest in the gale is heard;And sore must be the stormThat could abash the little birdThat kept so many warm.Ive heard it in the chillest land,And on the strangest sea;Yet, never, in extremity,It asked a crumb of me. Charles Dickens, The Mystery of Edwin DroodWhosoever has observed that sedate and clerical bird, the rook, may perhaps have noticed that when he wings his way homeward towards nightfall, in a sedate and clerical company, two rooks will suddenly detach themselves from the rest, will retrace their flight for some distance, and will there poise and linger; conveying to mere men the fancy that it is of some occult importance to the body politic, that this artful couple should pretend to have renounced connection with it.Similarly, service being over in the old Cathedral with the square tower, and the choir scuffling out again, and divers venerable persons of rook-like aspect dispersing, two of these latter retrace their steps, and walk together in the echoing Close.Henry James, The AmbassadorsUnless she hid herself altogether she could show but as one of these, an illustration of his domiciled and indeed of his confirmed condition. And the consciousness of all this in her charming eyes w as so clear and fine that as she thus publicly drew him into her boat she produced in him such a silent agitation as he was not to fail afterwards to denounce as pusillanimous. Ah dont be so charming to me!- for it makes us intimate, and after all what is between us when Ive been so tremendously on my guard and have seen you but half a dozen times? He recognized once more the perverse law that so inveterately governed his poor personal aspects: it would be exactly like the way things always turned out for him that he should affect Mrs. Pocock and Waymarsh as launched in a relation in which he had really never been launched at all. They were at this very moment- they could only be- attributing to him the full license of it, and all by the operation of her own tone with him; whereas his sole license had been to cling with intensity to the brink, not to dip so much as a toe into the flood. But the flicker of his fear on this occasion was not, as may be added, to repeat itself; it spran g up, for its moment, only to die down and then go out forever. To meet his fellow visitors invocation and, with Sarahs brilliant eyes on him, answer, was quite sufficiently to step into her boat. During the rest of the time her visit lasted he felt himself proceed to each of the proper offices, successively, for helping to keep the adventurous skiff afloat. It rocked beneath him, but he settled himself in his place. He took up an oar and, since he was to have the credit of pulling, pulled. Will Ferrell (Actor/Comedian), Commencement Address at Harvard University in 2003I graduated from the University of Life. All right? I received a degree from the School of Hard Knocks. And our colors were black and blue, baby. I had office hours with the Dean of Bloody Noses. All right? I borrowed my class notes from Professor Knuckle Sandwich and his teaching assistant, Ms. Fat Lip Thon Nyun. That’s the kind of school I went to for real, okay?

The Army and Air Force Exchange Service Research Paper

The Army and Air Force Exchange Service - Research Paper Example Fortunately AAFES has the opportunity to counter the potential decline in sales. With retail facilities operating in Europe and Asia, AAFES has the opportunity to increase sales in an area where the outside economy is unreasonable to shop in. Military service members receive cost of living allowance to offset the difference in cost of living off the economy. Despite having additional income the difference in price makes shopping AAFES more desirable as the customer's first choice. Social and cultural factors are perhaps the most critical when developing retail merchandise assortments. AAFES customers consist of military service members whom are mobile and global customer and are exposed to many global trends. According to the U.S Department of Defense demographic report, military active duty personnel stationed overseas consist of 7.4% stationed in Europe, and 6% in Asia. For this reason AAFES continues to practice market development by bringing products that customers have been exposed to in one country and can continue to buy when they move to another. Government intervention in the retail industry can put damper on business objectives. AAFES is not exempt from the possibility of mergers. In 2004 the Department of Defense proposed merger of AAFES, the NEX (Navy Exchange), and MCX (Marine Corp Exchange). The motion which would eliminate 2,500 jobs never took place, however AAFES is still planning for the coming of the Unified Exchange. This is evident in the joint ventures which have occurred amongst the exchanges to cut costs and increase buying power. With the government slowly lifting bans on restrictions on categories of merchandise, AAFES must prepare themselves for the moment that other changes could take place. Suppliers must be identified, merchandising practices decided upon, and more. In doing this AAFES will lose no time in planning to capture additional sales. Technological Creating customer loyalty has been an ongoing priority and challenge for retailers. Technology has allowed retailers to implement loyalty programs that also track consumer purchases. Amongst change in demand in consumer electronics is the decline of CD music sales in favor of mp3 sales. AAFES can expect the

Description of the current brand Assignment Example | Topics and Well Written Essays - 250 words

Description of the current brand - Assignment Example Second, its iconic Cadillac caters for the high-end market (General Motors 1). Thirdly, Chevrolet, GMC and Opel cater for the middle class market segment (General Motors 1). The multiple brands enable the organization to increase its product offering, a key source of competitive advantage in the motor industry. In addition, it enables it to compete in different parts of the world due to differences in consumer needs. In addition, the organization has sub-brands. For example, the organization has separated Cadillac from the other operations due to its huge potential and its ability to operate as a standalone unit (The Daily Herald). The essence of having a sub brand is that it enables the organization to focus on a niche market that it would otherwise have been unable to. Furthermore, its Chevy brand is doing well in the American market. As a result, it has the ability to operate as a sub brand. In conclusion, the motor vehicle industry is a heavily segmented market. Consumers have different utility needs and different levels of purchasing power. Consequently, manufacturers such as General Motors have embraced a product differentiation strategy that enables them to have multiple brands to satisfy the different market needs. In addition, it has sub-brands to cater for niche market

Five Common Bargains Assignment Example | Topics and Well Written Essays - 500 words

Five Common Bargains - Assignment Example Hence, I decided to buy a second hand car which would give me the opportunity to avail stylish comfort at a lower price. In this regards, I had fixed my budget at $ 15,000 which was accumulated with my savings, financial borrowing from my parents and a short-term bank loan. For the next few days I and one of my friends searched the internet, newspapers, and dealers to see where I could get a car that satisfies my aforementioned needs. Once I finished searching the internet, I found a car that I was looking for. It was from Hyundai with a quoted price of around $14,500 (Edmunds.com, 2012). After taking appointment with the dealer we went to see the car. Even though my accumulated budget was higher than the price charged I was quite concerned regarding the negotiation and testing of the quality of the product as it was an already used car. While negotiating over the price and the features of the car, I came to know that the actual selling price of the car that was quoted as $14,500 on the website, when include tax and insurance charges increased to around $ 17,000. However, as per the advice of my companion I decided to give another thought to the matter and inspect the other available dealers on the same car model. My survey results indicated that a Hyundai model was available at an average of $20,000 to $ 25,000 which was not significantly different from the quoted price for the used car. By the end of the day, I went back to the dealer for the final discussion and asked him to give a 10%-20% discount as the present market value of the same new Hyundai model was abou t $20,500 (Kelley Blue Book Co., Inc, 2012). Going through the service records of the car gave me enough information regarding the engine along with the details of how much the owner drove the car. I also took a test drive so that I can check the performance of the car. After having a test drive, my friend and I decided that we

Open field agriculture in England

Open field agriculture in England The open field system was a prevalent agricultural system in much of Europe from the middle ages; in some places it was still present up until the 20th century. For example in Herefordshire the last open fields were removed in the 20th century. This form of settlement can also be known as champion land. Each villager was allocated strips usually at a village meeting each year. Their holdings were scattered. However contrary to popular belief not all areas in England had open field farming in the medieval period. For example in Essex and Kent they retained pre Roman system of small square enclosed fields. Lincolnshire was a typical area of open field agriculture. However, much of pre roman Britain was an open field system. There is much division and debate on when the open field system originated. This can be argued that it is down to insufficient distinction being made between a three strip system, a three field system and an open field system.  [1]  H.L.Grays work in English field systems can be seen as a starting point in 1915. However it has now been realised that open field systems are much more complex than he first thought. He focused on the variety of open field systems. Later came Orwins view, in the open fields of 1938, they had a practical approach which was seen to be influential but they assumed that the open field system was fully running from the start which has been proven to be wrong. Then in 1964 came Joan thirsk new view, distinguishing between open fields and common fields and arguing that it developed slowly, maturing in the 13th century. In 1973 historical geographers Baker and Butlin did a number of regional studies which emphasised the variety, and stressed that they evolved . It concluded that the midland field system was more adaptable to change than was once believed.  [2]  This belief that they evolved is accepted but now earlier chronology is now preferred. Then in 1983 in the agricultural history review it drew attention to how they seemed to be planned. This was also argued in 1982 David Hall medieval fields for the 8th and 9th origin subdivided fields laid out in a deliberate act of planning. The original plan was drastically modified over time.  [3]  However this can be disputed R. A. Dodgshon argues that they were not consciously designed, but that they were makeshift and response to a diversity of influences. Opinion has therefore changed and evolved over time but is also still divided. Land was divided into what was known as planned countryside (champion) and ancient countryside (woodland). Thomas Harrison said it is so that soile being divided into champion ground and woodland  [4]  . In the champion everybody lives in uniformly built towns, it is a nucleated village, whereas woodland villages people are scattered. In the champion was where the open fields were, open fields are where there are no hedges or fixed physical boundaries, possibly on the edge but not internally, it has strips. The land is the champion is divided into lots of strips, each individual gets around 30 strips. They are scattered throughout the territory of the parish muddled with everybody elses. However it is in a regular order, as would be their houses in the streets also. Between 1220 and 1240 documents show that wherever Thomas de Hampton had strips then Henry de Kaam was his neighbour.  [5]  The strips of land also known as selions are then grouped into bundles called furlongs, t hese are then grouped into fields. Each village has two or three fields. Each year one of the fields was allowed to remain fallow. They were instead grazed with livestock, they became communal. Therefore it was communal on one hand but on the other individualistic, you got to keep what you grew. The strips could not be bundled into one group because if they were all in one place they may all be fallow for one year. In the late medieval periods they gradually disappear. It is often seen as hard to define when the open field system of agriculture first developed. There are many debates among historians for the origins of the open field system for example in a recent article on the common fields Dr Thirsk attacked the orthodox view of Gray Orwin on the subject. Dr Thirsk defined the classical common field system as being made up of four essential elements.  [6]  At first arable and meadow were divided into strips, then arable and meadow were open for common pasturing, then common rights over waste, then finally this was regulated by a group of people. This definition is quite unobjectionable, though it could be argued that its third element common rights over waste is not strictly essential to it.  [7]  In the journal it is argued that the open field system as it is normally understood did not come into being until the later Middle Ages. It argues that if dr thirsk succeeds in showing that the evidence for the existence of the open field syst em in the twelfth and thirteenth centuries is far from being conclusive or satisfactory.  [8]   Open field agriculture took many forms. Therefore it is hard to pin point when the origin was. The different factors which go to make up the various types of open field systems go some way towards explain the origins of such systems.  [9]  However this is then disputed by archaeologists who are concerned with the physical remains of the past e.g. ridge and furrow. The historians and historical geographers have a different view on the definition of open field systems compared to that of the archaeologists. Historians base their definitions on the systems, and social aspects. Not just merely the remains. This therefore leads to problems in dating when open fields originated. it is extremely difficult to discover the origins of almost any aspect of human behaviour, for until it is relatively common place it is usually difficult to detect archaeologically.  [10]  Also there is the problem that over the years there are changes that disrupt the land. Thus the physical manifestation s of open fields which archaeologists have to deal with are the result of the pattern imposed by the most recent cultivation, not the first.  [11]  Therefore when studying open field systems archaeologists look at the ridge and furrow and accept it to be medieval. It has however become clear from recent work they there was never just one type of open field system. Even by the thirteenth century, there was not one type of open field system but many.  [12]  There is often a pessimistic approach to the origins of open fields. The evidence that remains to help us discover the origins of the open field system includes ridge and furrow. A heavy plough, capable of turning over sod would cut the furrow and a mold board turns the soil sideways, pulled by 6 to 8 ox. We know this from domesday. This would gradually mound the soil up in the middle of the strip. The strips were not straight but always shaped as an s but backwards. This is because of the turning room the plough needed and the fact that most were right handed. We can date ridge and furrow from any time after the introduction of the heavy plough and not necessarily medieval. By the 11th century it was in use in most of England. It is important to remember that there was never one open field system over Britain that was identical and used. It also changed over the years. It developed over time. Why it grew is important. There needed to be a solution to the problem of farming with certain soils, animals, climate, topography, crops, markets, transportation and so forth. At any one moment there were open field villages in various stages of evolution.  [13]  Hard to define what an open field system was. It was different in different areas so can seen to be started at different times. Consequently, the second complex phenomenon behind the label is the lack of agreement of what is to be understood by an open field system, as different authors disagree to some extent on what constitutes the salient interlocking features of the system.  [14]   There are many broad outlines to what an open field system was and when it developed over the country making it difficult to summarise when it evolved. There is also lots of literature on this topic which is diverse. One of the earliest pieces of evidence of the early open field system comes from a law from King Ine of Wessex. If ceorls have a common meadow or other share land to enclose, and some have enclosed their share while other have not.  [15]  This was issued between 668 and 694. It gives evidence to the early existence of open fields. However it doesnt give elements of the whole system. It does not mention strips, cropping rules, common grazing or regulations. We cannot however assume that all land even within the same community was treated the same. All of the elements therefore may not have originated at once but could have been gradual. Then in 966 a charter refers to arable share land. it is very likely that the exploitation of the agricultural resources of midland E ngland was well established by the tenth century, although it is equally likely that the complex open filed system did not reach its full maturity before the twelfth.  [16]  There are now lots of evidence to suggest that the introduction of the open field system was a long term process. When looking at maps of open field systems you can see that each system is logically adapted to the geography of its parish. Also different systems co existed side by side in the same geographical area. The open field system originated because it was sufficient at feeding the population. Local landowners would rent land to farmers known as tenants, they would grow enough to survive and any left would be sold to market. Ridge and furrow advantages include drainage especially on heavy clay soils where the water wont drain easily. However you do not want to plough light soils such as chalk. Also there is the creased table cloth theory. Possible resistance to soil erosion and it creates more surface area so there is more land to grow crops on. For many centuries it met the countrys need for food, it also let villagers have a say as it made decision by vote, and people were working together, there was also the common land so a sense of community. It went hand in hand with the development of villages clustered around a nucleus of church and manor house. This created a sense of community, they worked communally, and open field agriculture is an example of this. In some villages, villagers owned a team of oxen so ploughed the strips in sequence. However in some ways it can also be seen as individualistic. It gradually spread over England, but it can never be said that it completely took over. The most common open field system was where a village had 3 bigs fields with the village located in the centre, each field could be miles across and each villagers would have strips of land in each field so that each would have a share of good and bad land.

Penelope and Alcestis as Ideal Greek Females Essay -- Homers Odyssey

Penelope of the Odyssey and Alcestis of Alcestis as Ideal Greek Females   Ã‚   Although there is some disagreement concerning the Greek’s definition of the ideal female, there is little disagreement that two women represented this Greek ideal. The character of Penelope of Homer's Odyssey 1 and Alcestis of Euripides' Alcestis 2, came to represent the same ideal of female excellence. The Greeks referred to this ideal female as a sophron woman. The qualities possessed by a sophron woman are tangible; she is a good housekeeper, a nurturer of her husband, a child-bearer. She is chaste, graceful and does not like to talk about sex with other women.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   According to Helen F. North in an article regarding the etymology of sophrosyne, the word originated in the Homeric epics as saophrosyne, which implies "soundness of mind" and is used only in relation to men.4 The word implies both "self-knowledge" and "a sense of propriety," putting one in mind of the inscription at Delphi. It is notable that in relation to men, sophrosyne does not carry specific behavioral connotations, as it does when it comes to be applied to women. Penelope's story, set in the time immediately proceeding the Trojan War, is one of strategic waiting. The Odyssey begins with stasis; simultaneously, Odysseus' departure from Ogygia and Telemachos' coming of age set the events of the epic in motion. As a woman, Penelope has no momentum of her own, but must operate on that of her kyrios. This is not to imply that Penelope is by definition powerless, but it is worth noting that the sphere of her effectiveness is actively determined by the wishes of the men responsible for her. In fact, Penelope faces a drastically reduced role whether Odysseus returns or... ...ophrosyne as the Virtue of Women in Antiquity." From Marcovich, Miroslave, ed. Illinois Classical Studies II (1977): 36. 4 Ibid: 37. 5 Ibid: 36.    Works Consulted Diana Buitron-Oliver and Beth Cohen,   "Between Skylla and Penelope: Female Characters of the Odyssey in Archaic and Classical Greek Art," pp. 29-58. "Female Representations and Interpreting the Odyssey," by Seth Schein, pp. 17-27. Richard Brilliant, "Kirke's Men: Swine and Sweethearts," pp. 165-73. Helene Foley, "Penelope as Moral Agent," in Beth Cohen, ed., The Distaff Side (Oxford 1995), pp. 93-115. "The Odyssey, History, and Women," by A. J. Graham, pp. 3-16, and Jennifer Neils, "Les Femmes Fatales: Skylla and the Sirens in Greek Art," pp. 175-84. Lillian Doherty, Siren Songs: Gender, Audiences, and Narrators in the Odyssey (Ann Arbor 1995), esp. chapter 1.

Attendance Requirement in College Essay

Attending college is supposed to signify freedom to make choices regarding education. However, many students who plans to continue their education realize that college does not give this freedom. In some countries, college students are expected to attend classes that they have register. However, should attendance be mandatory in college? Even though some believe that college attendance should be flexible, I believe that college attendance should be mandatory. The first reason why college attendance should be mandatory is the lack of understanding. For example, Students who attend regularly classes have better opportunity to understand the courses what are done in class, while students who do not attend classes will not understand. Also, because students who attend regularly the classes understand the courses, they have a better chance to have good grades during test. On the contrary, students who do not attend classes, and do not understand the courses; they get bad grades during test. Indeed, college attendance should be mandatory to help all the students understand the courses. Another reason why college attendance should be mandatory is it build relationships. College attendance build relation between students and students. In college, there is many ways to meet friends that you can count on in the future such as joining a club, or in class. Students who do not attend college classes will not have these opportunities. College also build relation between students and teachers. Students who attend classes have the opportunity to know their teachers. Teachers have the same opportunity to know their students, and that relation between them will help the teachers to know the students’ lacks and find ways to help them. On the other hand, students who do not attend school will be stuck with his lacks. Opponents believe that mandatory attendance policies does not go under life lesson categories. If students do not show up at the classes, they register that will not affect them in the real world. However, I believe it does go under life lesson categories. If students get into the habit of not showing at classes, they register that will affect them in the real world. For example, if you do not show at work, you will be fired. College attendance should be mandatory to avoid that habit. In conclusion, College attendance should be mandatory to help students understand their course, to build relationship between students/ students and students/ teacher and to avoid bad habit. Nowadays, many students are skipping classes. In my opinion, college attendance should be mandatory.

Free Essays on Similarities Of The Bible And Gilgamesh

In the first volume of the Norton Anthology of World Literature, the introduction tells the readers about the â€Å"invention of writing and the earliest literatures† (3). The earliest form of writing in 3000BC in Mesopotamia led to the first recorded story, Gilgamesh. Interpreted by N.K. Sandars, this epic shows the Egyptian’s love and worship of nature. The story also has several parallels to the bible and more specifically the story of Noah and the flood. The characters of Gilgamesh worship different gods of nature and emotions such as love. This is important in showing the importance of nature in the 3000 BC world. In this time the people would use everything in nature to help them prosper in their lives. The gods also helped Gilgamesh and Enkindu’s journey into the forest. By guiding the men, the sun god Shamash helped them to trudge onto their destination, to kill Humbaba. Shamash said, â€Å"Go forward, do not be afraid† (22). When they get to Humbaba, the god Shamash helped the men by summoning â€Å"the great wind, the north wind, the whirlwind, the storm and the icy wind†¦they came like dragons† (23). Because of the force of nature applied by Shamash, Gilgamesh and Enkindu defeated the beast Humbaba. The closest parallel to the bible is seen in part 5, The Story of the Flood. Both in the bible and Gilgamesh, there is an ark built and pitched. They both place animals on the boats, both bring their families, and both sent birds out to see if it was safe to leave the boat. Both boats also landed on a mountain. These stories similarities may be because of a story passed down from the times of Noah and incorporated into the story of Gilgamesh to add a bit of extra excitement.... Free Essays on Similarities Of The Bible And Gilgamesh Free Essays on Similarities Of The Bible And Gilgamesh In the first volume of the Norton Anthology of World Literature, the introduction tells the readers about the â€Å"invention of writing and the earliest literatures† (3). The earliest form of writing in 3000BC in Mesopotamia led to the first recorded story, Gilgamesh. Interpreted by N.K. Sandars, this epic shows the Egyptian’s love and worship of nature. The story also has several parallels to the bible and more specifically the story of Noah and the flood. The characters of Gilgamesh worship different gods of nature and emotions such as love. This is important in showing the importance of nature in the 3000 BC world. In this time the people would use everything in nature to help them prosper in their lives. The gods also helped Gilgamesh and Enkindu’s journey into the forest. By guiding the men, the sun god Shamash helped them to trudge onto their destination, to kill Humbaba. Shamash said, â€Å"Go forward, do not be afraid† (22). When they get to Humbaba, the god Shamash helped the men by summoning â€Å"the great wind, the north wind, the whirlwind, the storm and the icy wind†¦they came like dragons† (23). Because of the force of nature applied by Shamash, Gilgamesh and Enkindu defeated the beast Humbaba. The closest parallel to the bible is seen in part 5, The Story of the Flood. Both in the bible and Gilgamesh, there is an ark built and pitched. They both place animals on the boats, both bring their families, and both sent birds out to see if it was safe to leave the boat. Both boats also landed on a mountain. These stories similarities may be because of a story passed down from the times of Noah and incorporated into the story of Gilgamesh to add a bit of extra excitement....

Winston And Julia Essays - Julia, Winston, Proles, Free Essays

Winston And Julia Essays - Julia, Winston, Proles, Free Essays Winston And Julia Winston and Julia: an unlikely pair Ever since the fist time Winston laid eyes on Julia he really didnt like her all that much. What would bring two very contrary persons together? Julia is a vibrant young woman that is a member of an anti-sex league. To Winston, Julia looks like a stuck up girl with important things to do. On the other hand, Winston is a rather old man that isnt exactly the greatest looking guy in the world. Sometime into the novel Winston suspects that Julia may be following him. Winston figures that she is a spy, while she was following him he even considered killing her by taking a cobblestone and clubbing her head with it. A little later in the novel, Winston sees Julia trip and fall in the hallway, when he helps her up she slips him a piece of paper that read I love you. Winston tried to find some time to meet up with Julia. Time eventually passed and Winston began to wonder if Julia had changed her mind about what she wrote. During lunch one day Winston saw Julia sitting by herself in the middle of the cafeteria. He sat down and they began to talk secretly underneath their breath. Julia came up with an elaborate plan to meet up secretly later on. Later, Julia and Winston meet up in the Proles district. While they were together Winston found out that Julia was a lot like himself even though they appear to be completely opposite. Julia and Winston discovered that they both indulge in pleasures of the flesh and normal human pleasures, that is what brought them together.

Innovation Essay Example | Topics and Well Written Essays - 3000 words

Innovation - Essay Example However, with the increased information technology, there emerged rivals into the DRAMs market that started to compete with Intel Company such as Japan. This brought about the decrease in the company’s sales as there were different choices of products where the customers would choose from (Aid, 2012). This resulted in a loss for the company’s accounts as it had ventured a lot of funds into the DRAMs project. Some of the companies had a much more advanced technology in the manufacturing of DRAMs such as the ones that were used by the Japanese. The Japanese had links with the various raw materials, as well as labor suppliers. Skilled labor was readily available for the Japanese thus making great inventions into the DRAMs market. Through the availability of effective machinery in the Japanese’s industries, they were able to effectively assemble DRAMs that were of a higher quality compared to the ones that Intel was assembling. However, some companies such as Nikon helped in the advancement of the DRAMs thus beating Intel Company out of the market. Financial institutions in Japanese provided low interest charges on loans to the investors. This lead to the motivation of the entrepreneurs who had an eye in the assembling of the DRAMs thus resulting in increased variety of the products. With the continuously improving technology, the firms with the adequate and modernized machinery were the only ones that had a competitive advantage in the DRAMs market. This resulted to the decline of most of the firms that were technologically poor as their products did not meet the expectations of the clients (Aid, 2012). The company’s success can be attributed to its uniqueness in the undertakings in the micro-processor market. The company was strategically positioned in regard to successfully having an exploration of the microprocessor venture through technological designs. This favored the markets of the processors

Western civilization.The rise of Adolf Hitler and Joseph Stalin. Rise Essay

Western civilization.The rise of Adolf Hitler and Joseph Stalin. Rise of Islamic Fundamentalism - Essay Example The study of history can be tedious and cumbersome to most people but provides many of the important lessons and insights that learning from the past offers to anyone interested in it. This is because knowledge of the various social, economic and political events in the past gives and also provides a guide for the future events as well which prevents committing or repeating the same mistakes or errors. Interpretation of the past is a requisite to have a better grasp of today's events, putting them in the right perspective, context, or understanding enabled with the benefit of hindsight. This paper presents four major historical events which still influenced present events despite the passage of several years. Discussion The four major events were the rise of radical totalitarian dictatorships out of the chaotic political and economic conditions at the turn of the twentieth century, which in turn produced important political figures like Hitler and Stalin who took advantage of those c onditions to change the course of world history, the women's movement (sometimes termed as feminism) that originally grew out of the black American civil rights movement and aimed to improve the lot of women like the right of suffrage and lastly, the rise of Islamic fundamentalism or extremism that saw its culmination in the September 11 terrorist attacks and the war in Afghanistan today. The Rise of Adolf Hitler and Joseph Stalin Totalitarian dictatorships are political systems in which only one person or a small group of just a few persons control the levers of political machinery and the government. Radical totalitarian dictatorships in this regard are political systems in which the government or the state controls all aspects of the life of its citizens, including their private lives, hence the term totality is a reference to state control of all sectors of society, everything for the state and nothing is against the state (as the saying goes). A dictatorship is a form of author itarianism, in which only a junta, a committee or a small group composed of members of the political elites, hold power by virtue of their authority but implies not all social institutions are totally under state control. The radical term as used here denotes only one person holds all the powers, like Stalin was in Russia. Adolf Hitler was a German politician who was born in Austria (1889-1945) and he rose to power through the Nazi Party of Germany (NSDAP). He was a decorated World War I hero; he was imprisoned briefly in 1923 for a failed coup d'etat but once released the next year, quickly rose in the party ranks due to his populist ideas of pan-Germanism (extreme nationalism), anti-semitism (hatred of Jews) and strong anti-communism views. He was also a terrific orator and is able to convince the German population of his ideas, especially those repudiating the terms of the Treaty of Versailles (peace treaty in WWI) as pretty onerous to the German economy. He went on re-arming Ger many in violation of this peace treaty and seized adjoining territories in pursuit of his Lebensraum policy (expanding the living space of Germans), with Germany becoming one party dictatorship under Nazism (nationalist socialism). Germany was able to control most of the European continent and North Africa during the height of its military successes, but Hitler and his wife committed suicide in April 1945 to avoid capture by Red Army forces prior to defeat. Joseph Vissarionovich Stalin was one of the original Bolshevik revolutionaries who had fought in the Russian Revolution of 1917 that brought down the Russian monarchy and considers himself as the rightful heir of Vladimir Lenin by eliminating most of his serious rivals, primarily Leon Trotsky who was assassinated in Mexico City in 1940 as a threat to Stalin's own ambitions. Stalin was

The French Revolution Research Paper Example | Topics and Well Written Essays - 500 words

The French Revolution - Research Paper Example deas included unfair taxation, the gap that existed between the poor and the rich social groups and the American Revolution and finally independence declaration of America (Noonan, 1999). The people in the third estate social group had very little rights whether socially or politically. However, some of the educated persons such as doctors and lawyers, belonging to third estate social class were in a position to read all the upcoming new ideas made by the government from some philosophers such as John Lacke, Rousseau, and Montesquieu. These philosophers talked about a democratic government possessing freedoms and natural rights. Eventually, the people belonging to the third estate social group began questioning the France government using the standards stated by the philosophers and began to demand for equality and democracy in the country (Noonan, 1999). Unfair taxation was an economic cause of the revolution. Third estate comprised of doctors, lawyers, merchants, and peasants who faced heavy taxation in many things while the richest estates paid little or no taxes. This was unfair treatment considering that people from the richest estates had a lot of money, large plots of land and positions in the government and good interaction with the government. This unfair treatment of the third estate people angered them and made a prompt of the revolution. The social cause of the revolution was the large gap that existed between the rich people and the poor people. There were few members belonging to the first and second estates while third estate made up of the biggest population. However, the rich owned biggest portions of land while the poor had little portions of land yet they made the biggest population in the country. Prove of the gap between the rich and the poor, was unequal taxation for the rich and the poor. Politically, third est ate people did not have privileges and right to contribute in the then government yet the nobles and clergies had the right. The

Socialization Essay Example for Free

Socialization Essay Socialization can be defined from a dictionary as â€Å" a continuing process whereby an individual person acquires a personal identity and learns the norms, values, behavior and social skills appropriate to his or her social position†. Socialization is a continuous life process, but is in general divided into two very distinct groups: primary socialization and secondary socialization. But has socialization changed over the years? If so, what has been the driving force behind this change? Could it be because of the difference in the primary socialization in the home? Or perhaps the multicultural society in which we now live? Socialization occurs throughout life but is most effective in infancy and early childhood. Primary socialization occurs in the home between the parent and child. It is a process by which a child learns the cultural norms from their parents. Primary social groups are small intimate groups which include family, close friends, work colleagues and neighbors. It is from everyday group living with the family that a child gets his or her first introduction to acceptable norms of behavior, values, and morals. Ely Chinoy, in a 1960s standard textbook on sociology, says that socialization serves two major functions: On the one hand, it prepares the individual for the roles he 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. —Chinoy, 1961: 75 The parent or guardian also passes on their views on language, customs, and religion in a comfortable informal way. The family acts as an agent of social control by teaching its members right from wrong and punishing it’s members for wrongdoing. One extremely interesting point of note about socialization is the prominence that is sited on mothers and the role that mothers play in the socialization process. We are told that it is mothers who are primarily involved in the earlier unconscious stage of socialization. However has this intimate relationship changed over the years? Undoubtedly the task of primary socialization has undergone immense change in the last thirty years. The rise of the â€Å"Celtic tiger† has meant the role of primary socialization has become harder to enforce. The increase in the numbers of women returning to the work force has influenced the way that socialization had previously been structured in the home. More and more children are being cared for by child minders or in creches. Thus this means that the role of primary socialization has become an area which involves a much wider circle of people. From the beginning of the past decade, the majority of children in this state where being cared for by their mother in the home. Today life and families are not so straight-laced. Families are a complex unit that incorporates ideas that never occurred in past generations. The ideals of a family consisting of a father: breadwinner and head of household, and a mother who was involved in mainly household tasks and the rearing of the children, where soon forgotten. Instead these where to be replaced with the new concepts of blended families, one or lone parent families, foster families and adopted families. Another major change in the life of the family that would influence primary socialization is the average number of children in the family. The decrease in the number of children in the average family home has changed the environment of the home dramatically. Parents now have fewer children than past generations. This in turn leads to parents having much more time to instill values, morals, religion and other customs in their children. The rise in children attending these playschools means that a child is exposed to secondary socialization at an earlier age. Secondary socialization is another example of how our socialization patterns have changed over time. Secondary socialization occurs in groups that are usually larger and more impersonal than primary groups. Members usually see each other on an infrequent basis, and these groups are not considered to be permanent. Examples are trade union memberships, religious and ethnic groups, pressure groups, voluntary organizations and the schooling system. This form of socialization is commonly introduced when a child starts school. It is a child’s first experience of formal teaching and reinforces his or her past knowledge from primary socialization. This type of socialization has shown great distinction from previous eras. The multicultural and ethnic times we live in have changed the way this eneration socializes. The school system has had a major role to play in this. According to Christine E. Sleeted, â€Å"during the 1960s, textbooks clearly featured experiences and viewpoints of white middle class and elite people, mainly men. Over the past twenty-five years textbooks have gone through phases of active revision†. (Christine E. Sleeter 1996: 91). The world in which this generation grows is wholly different to the more guarded and constrained world of the past. The integration of different cultures and ethnicities into Irish society has made a series of changes to the way we now socialize. Children are integrated into a society that incorporates the views of different races, religions and customs. For this reason the education system has undergone immense change and as Christine E. Sleeted insists, â€Å"almost any textbook published over the last ten years appears t be well integrated. Many teachers work to make their curricula multicultural†. The implications of this multicultural curriculum are the increase in the level of understanding and acceptance in society as a whole. (Christine E. Sleeter 1996:91). Similarly Antonia Darder claims that in liberal educational American schools they â€Å"strongly incorporate the central pedagogical themes of appropriation, subjectivity, and interionality, along with a strong humanistic emphasis on the uniqueness of the individual†. (Antonia Darder 1991:8). This vital socialization enables society to combat issues such as classism, racism and sexism. The change in the socialization process is incontrovertible. In both of the distinct areas of socialization; primary socialization and secondary socialization change has certainty occurred and is evident in the socialization patterns of the past decade. The substantial transformation of the family has impacted on the aspect of primary socialization. While it is evident from research that the secondary socialization process is adjusting and amending its teaching methods to incorporate a new multicultural generation. The combination of the two reformed socialization processes has undoutedly changed the way this generation sees society. Due to the new teachings of acceptance and equality, life has changed for people in Ireland to a life that incorporates and supports a diverse society.

Amplitude modulation

Amplitude modulation Amplitude modulation Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. AM works by varying the strength of the transmitted signal in relation to the information being sent. For example, changes in the signal strength can be used to reflect the sounds to be reproduced by a speaker, or to specify the light intensity of television pixels. (Contrast this with frequency modulation, also commonly used for sound transmissions, in which the frequency is varied; and phase modulation, often used in remote controls, in which the phase is varied) In the mid-1870s, a form of amplitude modulation—initially called undulatory currents—was the first method to successfully produce quality audio over telephone lines. Beginning with Reginald Fessendens audio demonstrations in 1906, it was also the original method used for audio radio transmissions, and remains in use today by many forms of communication—AM is often used to refer to the mediumwave broadcast band (see AM radio). Forms of amplitude modulation As originally developed for the electric telephone, amplitude modulation was used to add audio information to the low-powered direct current flowing from a telephone transmitter to a receiver. As a simplified explanation, at the transmitting end, a telephone microphone was used to vary the strength of the transmitted current, according to the frequency and loudness of the sounds received. Then, at the receiving end of the telephone line, the transmitted electrical current affected an electromagnet, which strengthened and weakened in response to the strength of the current. In turn, the electromagnet produced vibrations in the receiver diaphragm, thus closely reproducing the frequency and loudness of the sounds originally heard at the transmitter. In contrast to the telephone, in radio communication what is modulated is a continuous wave radio signal (carrier wave) produced by a radio transmitter. In its basic form, amplitude modulation produces a signal with power concentrated at the carrier frequency and in two adjacent sidebands. This process is known as heterodyning. Each sideband is equal in bandwidth to that of the modulating signal and is a mirror image of the other. Amplitude modulation that results in two sidebands and a carrier is often called double sideband amplitude modulation (DSB-AM). Amplitude modulation is inefficient in terms of power usage and much of it is wasted. At least two-thirds of the power is concentrated in the carrier signal, which carries no useful information (beyond the fact that a signal is present); the remaining power is split between two identical sidebands, though only one of these is needed since they contain identical information. To increase transmitter efficiency, the carrier can be removed (suppressed) from the AM signal. This produces a reduced-carrier transmission or double-sideband suppressed-carrier (DSBSC) signal. A suppressed-carrier amplitude modulation scheme is three times more power-efficient than traditional DSB-AM. If the carrier is only partially suppressed, a double-sideband reduced-carrier (DSBRC) signal results. DSBSC and DSBRC signals need their carrier to be regenerated (by a beat frequency oscillator, for instance) to be demodulated using conventional techniques. Even greater efficiency is achieved—at the expense of increased transmitter and receiver complexity—by completely suppressing both the carrier and one of the sidebands. This is single-sideband modulation, widely used in amateur radio due to its efficient use of both power and bandwidth. A simple form of AM often used for digital communications is on-off keying, a type of amplitude-shift keying by which binary data is represented as the presence or absence of a carrier wave. This is commonly used at radio frequencies to transmit Morse code, referred to as continuous wave (CW) operation. In 1982, the International Telecommunication Union (ITU) designated the various types of amplitude modulation as follows: Designation Description A3E double-sideband full-carrier the basic AM modulation scheme R3E single-sideband reduced-carrier H3E single-sideband full-carrier J3E single-sideband suppressed-carrier B8E independent-sideband emission C3F vestigial-sideband Lincompex linked compressor and expander Example: double-sideband AM A carrier wave is modeled as a simple sine wave, such as: c(t) = Ccdot sin(omega_c t + phi_c),, where the radio frequency (in Hz) is given by: omega_c / (2pi)., For generality, C,and phi_c,are arbitrary constants that represent the carrier amplitude and initial phase. For simplicity, we set their respective values to 1 and 0. Let m(t) represent an arbitrary waveform that is the message to be transmitted. And let the constant M represent its largest magnitude. For instance: m(t) = Mcdot cos(omega_m t + phi)., Thus, the message might be just a simple audio tone of frequency omega_m / (2pi)., It is generally assumed that omega_m ll omega_c, and that min[ m(t) ] = -M., Then amplitude modulation is created by forming the product: y(t), = [A + m(t)]cdot c(t),, = [A + Mcdot cos(omega_m t + phi)]cdot sin(omega_c t). A,represents another constant we may choose. The values A=1, and M=0.5, produce a y(t) depicted by the graph labelled 50% Modulation in 4. For this simple example, y(t) can be trigonometrically manipulated into the following equivalent form: y(t) = Acdot sin(omega_c t) + begin{matrix}frac{M}{2} end{matrix} left[sin((omega_c + omega_m) t + phi) + sin((omega_c omega_m) t phi)right]., Therefore, the modulated signal has three components, a carrier wave and two sinusoidal waves (known as sidebands) whose frequencies are slightly above and below omega_c., Also notice that the choice A=0 eliminates the carrier component, but leaves the sidebands. That is the DSBSC transmission mode. To generate double-sideband full carrier (A3E), we must choose: A ge M., For more general forms of m(t), trigonometry is not sufficient. But if the top trace of 2 depicts the frequency spectrum, of m(t), then the bottom trace depicts the modulated carrier. It has two groups of components: one at positive frequencies (centered on + ωc) and one at negative frequencies (centered on − ωc). Each group contains the two sidebands and a narrow component in between that represents the energy at the carrier frequency. We need only be concerned with the positive frequencies. The negative ones are a mathematical artifact that contains no additional information. Therefore, we see that an AM signals spectrum consists basically of its original (2-sided) spectrum shifted up to the carrier frequency. For those interested in the mathematics of 2, it is a result of computing the Fourier transform of: [A + m(t)]cdot sin(omega_c t),,using the following transform pairs: begin{align} m(t) quad stackrel{mathcal{F}}{Longleftrightarrow}quad M(omega) \ sin(omega_c t) quad stackrel{mathcal{F}}{Longleftrightarrow}quad i pi cdot [delta(omega +omega_c)-delta(omega-omega_c)] \ Acdot sin(omega_c t) quad stackrel{mathcal{F}}{Longleftrightarrow}quad i pi A cdot [delta(omega +omega_c)-delta(omega-omega_c)] \ m(t)cdot sin(omega_c t) quad stackrel{mathcal{F}}{Longleftrightarrow} frac{1}{2pi}cdot {M(omega)} * {i pi cdot [delta(omega +omega_c)-delta(omega-omega_c)]} \ = frac{i}{2}cdot [M(omega +omega_c) M(omega -omega_c)] end{align} In terms of the positive frequencies, the transmission bandwidth of AM is twice the signals original (baseband) bandwidth—since both the positive and negative sidebands are shifted up to the carrier frequency. Thus, double-sideband AM (DSB-AM) is spectrally inefficient, meaning that fewer radio stations can be accommodated in a given broadcast band. The various suppression methods in Forms of AM can be readily understood in terms of the diagram in 2. With the carrier suppressed there would be no energy at the center of a group. And with a sideband suppressed, the group would have the same bandwidth as the positive frequencies of M(omega)., The transmitter power efficiency of DSB-AM is relatively poor (about 33%). The benefit of this system is that receivers are cheaper to produce. The forms of AM with suppressed carriers are found to be 100% power efficient, since no power is wasted on the carrier signal which conveys no information. Modulation index As with other modulation indices, in AM, this quantity, also called modulation depth, indicates by how much the modulated variable varies around its original level. For AM, it relates to the variations in the carrier amplitude and is defined as: h = frac{mathrm{peak value of } m(t)}{A} = frac{M}{A}, where M,and A,were introduced above. So if h = 0.5, the carrier amplitude varies by 50% above and below its unmodulated level, and for h = 1.0 it varies by 100%. To avoid distortion in the A3E transmission mode, modulation depth greater than 100% must be avoided. Practical transmitter systems will usually incorporate some kind of limiter circuit, such as a VOGAD, to ensure this. Variations of modulated signal with percentage modulation are shown below. In each image, the maximum amplitude is higher than in the previous image. Note that the scale changes from one image to the next. Amplitude modulator designs This section does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (October 2008) This article only describes one highly specialized aspect of its associated subject. Please help improve this article by adding more general information. (October 2009) Circuits A wide range of different circuits have been used for AM, but one of the simplest circuits uses anode or collector modulation applied via a transformer. While it is perfectly possible to create good designs using solid-state electronics, valved (vacuum tube) circuits are shown here. In general, valves are able to more easily yield RF powers, in excess of what can be easily achieved using solid-state transistors. Most high-power broadcast stations still use valves. Anode modulation using a transformer. The tetrode is supplied with an anode supply (and screen grid supply) which is modulated via the transformer. The resistor R1 sets the grid bias; both the input and outputs are tuned LC circuits which are tapped into by inductive coupling Modulation circuit designs can be broadly divided into low and high level. Low level Here a small audio stage is used to modulate a low power stage; the output of this stage is then amplified using a linear RF amplifier. Advantages The advantage of using a linear RF amplifier is that the smaller early stages can be modulated, which only requires a small audio amplifier to drive the modulator. Disadvantages The great disadvantage of this system is that the amplifier chain is less efficient, because it has to be linear to preserve the modulation. Hence Class C amplifiers cannot be employed. An approach which marries the advantages of low-level modulation with the efficiency of a Class C power amplifier chain is to arrange a feedback system to compensate for the substantial distortion of the AM envelope. A simple detector at the transmitter output (which can be little more than a loosely coupled diode) recovers the audio signal, and this is used as negative feedback to the audio modulator stage. The overall chain then acts as a linear amplifier as far as the actual modulation is concerned, though the RF amplifier itself still retains the Class C efficiency. This approach is widely used in practical medium power transmitters, such as AM radiotelephones. High level With high level modulation, the modulation takes place at the final amplifier stage where the carrier signal is at its maximum Advantages One advantage of using class C amplifiers in a broadcast AM transmitter is that only the final stage needs to be modulated, and that all the earlier stages can be driven at a constant level. These class C stages will be able to generate the drive for the final stage for a smaller DC power input. However, in many designs in order to obtain better quality AM the penultimate RF stages will need to be subject to modulation as well as the final stage. Disadvantages A large audio amplifier will be needed for the modulation stage, at least equal to the power of the transmitter output itself. Traditionally the modulation is applied using an audio transformer, and this can be bulky. Direct coupling from the audio amplifier is also possible (known as a cascode arrangement), though this usually requires quite a high DC supply voltage (say 30 V or more), which is not suitable for mobile units. See also * AM radio * Mediumwave band used for AM broadcast radio * Longwave band used for AM broadcast radio * Frequency modulation * Shortwave radio almost universally uses AM, narrow FM occurring above 25MHz. * Modulation, for a list of other modulation techniques * Amplitude modulation signalling system (AMSS), a digital system for adding low bitrate information to an AM signal. * Sideband, for some explanation of what this is. * Types of radio emissions, for the emission types designated by the ITU * Airband * Quadrature amplitude modulation References * Newkirk, David and Karlquist, Rick (2004). Mixers, modulators and demodulators. In D. G. Reed (ed.), The ARRL Handbook for Radio Communications (81st ed.), pp.15.1-15.36. Newington: ARRL. ISBN 0-87259-196-4. Pulse-amplitude modulation From Wikipedia, the free encyclopedia Principle of PAM; (1) original Signal, (2) PAM-Signal, (a) Amplitude of Signal, (b) Time Overview Pulse-amplitude modulation, acronym PAM, is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. Example: A two bit modulator (PAM-4) will take two bits at a time and will map the signal amplitude to one of four possible levels, for example −3 volts, −1 volt, 1 volt, and 3 volts. Demodulation is performed by detecting the amplitude level of the carrier at every symbol period. Pulse-amplitude modulation is widely used in baseband transmission of digital data, with non-baseband applications having been largely superseded by pulse-code modulation, and, more recently, by pulse-position modulation. In particular, all telephone modems faster than 300 bit/s use quadrature amplitude modulation (QAM). (QAM uses a two-dimensional constellation). Usage of Pulse-amplitude modulation in Ethernet It should be noted, however, that some versions of the widely popular Ethernet communication standard are a good example of PAM usage. In particular, the Fast Ethernet 100BASE-T2 medium, running at 100Mb/s, utilizes 5 level PAM modulation (PAM-5) running at 25 megapulses/sec over two wire pairs. A special technique is used to reduce inter-symbol interference between the unshielded pairs. Later, the gigabit Ethernet 1000BASE-T medium raised the bar to use 4 pairs of wire running each at 125 megapulses/sec to achieve 1000Mb/s data rates, still utilizing PAM-5 for each pair. The IEEE 802.3an standard defines the wire-level modulation for 10GBASE-T as a Tomlinson-Harashima Precoded (THP) version of pulse-amplitude modulation with 16 discrete levels (PAM-16), encoded in a two-dimensional checkerboard pattern known as DSQ128. Several proposals were considered for wire-level modulation, including PAM with 12 discrete levels (PAM-12), 10 levels (PAM-10), or 8 levels (PAM-8), both with and without Tomlinson-Harashima Precoding (THP). amplitude modulation DEFINITION- Also see modulation. Amplitude modulation (AM) is a method of impressing data onto an alternating-current (AC) carrier waveform.The highest frequency of the modulating data is normally less than 10 percent of the carrier frequency.The instantanous amplitude (overall signal power) varies depending on the instantaneous amplitude of the modulating data. In AM, the carrier itself does not fluctuate in amplitude.Instead, the modulating data appears in the form of signal components at frequencies slightly higher and lower than that of the carrier.These components are called sidebands. The lower sideband (LSB) appears at frequencies below the carrier frequency; the upper sideband (USB) appears at frequencies above the carrier frequency.The LSB and USB are essentially mirror images of each other in a graph of signal amplitude versus frequency, as shown in the illustration.The sideband power accounts for the variations in the overall amplitude of the signal. When a carrier is amplitude-modulated with a pure sine wave, up to 1/3 (33 percent) of the overall signal power is contained in the sidebands.The other 2/3 of the signal power is contained in the carrier, which does not contribute to the transfer of data.With a complex modulating signal such as voice, video, or music, the sidebands generally contain 20 to 25 percent of the overall signal power; thus the carrier consumes 75 to 80 percent of the power.This makes AM an inefficient mode.If an attempt is made to increase the modulating data input amplitude beyond these limits, the signal will become distorted, and will occupy a much greater bandwidth than it should.This is called overmodulation, and can result in interference to signals on nearby frequencies. Analog modulation methods A low-frequency message signal (top) may be carried by an AM or FM radio wave. Common analog modulation techniques are: * Amplitude modulation (AM) (here the amplitude of the carrier signal is varied in accordance to the instantaneous amplitude of the modulating signal) o Double-sideband modulation (DSB) Â § Double-sideband modulation with unsuppressed carrier (DSB-WC) (used on the AM radio broadcasting band) Â § Double-sideband suppressed-carrier transmission (DSB-SC) Â § Double-sideband reduced carrier transmission (DSB-RC) o Single-sideband modulation (SSB, or SSB-AM), Â § SSB with carrier (SSB-WC) Â § SSB suppressed carrier modulation (SSB-SC) o Vestigial sideband modulation (VSB, or VSB-AM) o Quadrature amplitude modulation (QAM) * Angle modulation o Frequency modulation (FM) (here the frequency of the carrier signal is varied in accordance to the instantaneous frequency of the modulating signal) o Phase modulation (PM) (here the phase shift of the carrier signal is varied in accordance to the instantaneous phase shift of the modulating signal) AMPLITUDE MODULATION How it works. We know that something as simple as a crystal diode (rectifier) can be used to capture sound from the air and put it into a pair of earphones or an amplifier and speaker. How can this work? We will cover that here and now. All AM (Amplitude Modulation) detectors work basically the same way. What is AM? What we can hear as audio is classically considered to be the frequency range between 20 and 20,000 cycles per second (here after referred to as cycles and abandoning hertz) which I have never liked). In reality most adults can only hear up to about 13,000 cycles. Most speakers cant reproduce anything lower than 30 cycles in spite of the exaggerated claims of proud owners. So lets be generous and call audio 30 to 15,000 cycles. Radio frequencies are between 8,000 cycles and 50,000 megacycles. Thats right there is a range of frequencies that depending on how they are treated can be audio or radio. The AM radio band begins at 540 kilocycles. For simplicity lets say that we want to transmit a 10,000 cycle tone on a radio transmitter operating on 250 kilocycles. The 250 kc transmitting frequency is called the carrier wave because it may be thought of as carrying the audio. The 10,000 cycle audio frequency is called the modulating frequency. We may get into side-bands later. In the above the upper wave is the modulating wave and three cycles of it can be seen. The lower wave is the modulated carrier wave and 75 cycles are visible. (You can count them for yourself or take my word for it.) Notice as the modulating wave goes up the total amplitude of the carrier wave (measured from negative peak to positive peak) goes up. As the modulating wave goes down the amplitude of the carrier wave goes down. When the modulating wave is at zero (the point where it begins and ends) the carrier wave is at its middle or unmodulated value. Think of the modulating wave as controlling a valve that the carrier wave is passing through. (I have direct conformation from England, thats why the British call tubes valves.) The carrier wave can then be sent to an antenna which radiates it out for all the world to hear. Detecting the signal Detection is the word applied to the process of recovering the audio frequencies from the radio frequency carrier. In the case of amplitude modulation it is very simple. All we need to do is to rectify the signal. Rectification is the process used in power supplies to change AC to DC. Its really quite similar for detecting radio signals. Compare the carrier wave in the below with the one in the above. The wave has been run through a rectifier which removed the bottom half of every cycle. If we draw a line connecting the peaks we have the original modulating signal back again. Connecting the peaks is done by using a capacitor to charge up to the peak value and discharge through a resistor just fast enough to follow the modulating frequency but not so fast as to cause a large variation at the carrier frequency. The frequencies chosen for this drawing are fairly close together to make it possible to see the individual cycles on your computer screen. When dealing with the AM broadcast band the carrier frequencies range from 540 kc to 1600 kc. 10,000 cycles is the absolute upper limit for audio on AM and most transmitters only make it to about 8,000 cycles. Look back at the diagram of the crystal set. Use your back button to return here. If you are familiar with power supply circuits you will recognize it as a half wave rectifier with a capacitor to filter out ripple. The resistor makes the capacitor discharge just fast enough but not too fast. A much more rigorous discussion of AM, including side bands, is available by clicking here. This includes not only AM but SSB and FM. AMPLITUDE MODULATION Amplitude modulation or AM as it is often called, is a form of modulation used for radio transmissions for broadcasting and two way radio communication applications. Although one of the earliest used forms of modulation it is still in widespread use today. The first amplitude modulated signal was transmitted in 1901 by a Canadian engineer named Reginald Fessenden. He took a continuous spark transmission and placed a carbon microphone in the antenna lead. The sound waves impacting on the microphone varied its resistance and in turn this varied the intensity of the transmission. Although very crude, signals were audible over a distance of a few hundred metres, although there was a rasping sound caused by the spark. With the introduction of continuous sine wave signals, transmissions improved significantly, and AM soon became the standard for voice transmissions. Nowadays, amplitude modulation, AM is used for audio broadcasting on the long medium and short wave bands, and for two way radio communication at VHF for aircraft. However as there now are more efficient and convenient methods of modulating a signal, its use is declining, although it will still be very many years before it is no longer used. What is amplitude modulation? In order that a radio signal can carry audio or other information for broadcasting or for two way radio communication, it must be modulated or changed in some way. Although there are a number of ways in which a radio signal may be modulated, one of the easiest, and one of the first methods to be used was to change its amplitude in line with variations of the sound. The basic concept surrounding what is amplitude modulation, AM, is quite straightforward. The amplitude of the signal is changed in line with the instantaneous intensity of the sound. In this way the radio frequency signal has a representation of the sound wave superimposed in it. In view of the way the basic signal carries the sound or modulation, the radio frequency signal is often termed the carrier. What is amplitude modulation, AM Amplitude Modulation, AM When a carrier is modulated in any way, further signals are created that carry the actual modulation information. It is found that when a carrier is amplitude modulated, further signals are generated above and below the main carrier. To see how this happens, take the example of a carrier on a frequency of 1 MHz which is modulated by a steady tone of 1 kHz. The process of modulating a carrier is exactly the same as mixing two signals together, and as a result both sum and difference frequencies are produced. Therefore when a tone of 1 kHz is mixed with a carrier of 1 MHz, a sum frequency is produced at 1 MHz + 1 kHz, and a difference frequency is produced at 1 MHz 1 kHz, i.e. 1 kHz above and below the carrier. If the steady state tones are replaced with audio like that encountered with speech of music, these comprise many different frequencies and an audio spectrum with frequencies over a band of frequencies is seen. When modulated onto the carrier, these spectra are seen above and below the carrier. It can be seen that if the top frequency that is modulated onto the carrier is 6 kHz, then the top spectra will extend to 6 kHz above and below the signal. In other words the bandwidth occupied by the AM signal is twice the maximum frequency of the signal that is used to modulated the carrier, i.e. it is twice the bandwidth of the audio signal to be carried. Amplitude demodulation Amplitude modulation, AM, is one of the most straightforward ways of modulating a radio signal or carrier. The process of demodulation, where the audio signal is removed from the radio carrier in the receiver is also quite simple as well. The easiest method of achieving amplitude demodulation is to use a simple diode detector. This consists of just a handful of components:- a diode, resistor and a capacitor. AM diode detector AM Diode Detector In this circuit, the diode rectifies the signal, allowing only half of the alternating waveform through. The capacitor is used to store the charge and provide a smoothed output from the detector, and also to remove any unwanted radio frequency components. The resistor is used to enable the capacitor to discharge. If it were not there and no other load was present, then the charge on the capacitor would not leak away, and the circuit would reach a peak and remain there. Advantages of Amplitude Modulation, AM There are several advantages of amplitude modulation, and some of these reasons have meant that it is still in widespread use today: * It is simple to implement * it can be demodulated using a circuit consisting of very few components * AM receivers are very cheap as no specialised components are needed. Disadvantages of amplitude modulation Amplitude modulation is a very basic form of modulation, and although its simplicity is one of its major advantages, other more sophisticated systems provide a number of advantages. Accordingly it is worth looking at some of the disadvantages of amplitude modulation. * It is not efficient in terms of its power usage * It is not efficient in terms of its use of bandwidth, requiring a bandwidth equal to twice that of the highest audio frequency * It is prone to high levels of noise because most noise is amplitude based and obviously AM detectors are sensitive to it. Summary AM has advantages of simplicity, but it is not the most efficient mode to use, both in terms of the amount of space or spectrum it takes up, and the way in which it uses the power that is transmitted. This is the reason why it is not widely used these days both for broadcasting and for two way radio communication. Even the long, medium and short wave broadcasts will ultimately change because of the fact that amplitude modulation, AM, is subject to much higher levels of noise than are other modes. For the moment, its simplicity, and its wide usage, mean that it will be difficult to change quickly, and it will be in use for many years to come