Pamphlet analysis Essay

The purpose of this film pamphlet is to influence and persuade as much people as people to watch the film. The pamphlet also briefly describes what the film is going to be about. This pamphlet attempts to do these things by visual, layout and language features to achieve its purpose. A visual feature that helps to achieve its purpose is colour which is all over the film pamphlet. Colours may be used to create a feeling or mood depending on the context. In this particular film pamphlet, the colours have been put together to establish a romantic feel. The two most obvious colours on the cover of the film pamphlet are the orange of the title and the red of the chilli. These two colours are clearly creating a romantic sense. The tone of the title is quite light and that helps emphasise the feel of the advertisement for the title is called A Touch of Spice. Having a light tone makes it seem as though the title was written out with orange spices and supports the word touch in the title which means a small amount in this context. The large chilli on the front of the cover is highly saturated. The red on the chilli is of a high degree of purity and that helps the advertisement gain the attention of consumers and also creates a romantic feel in this context. Red in this ad can be seen as an allusion because red is a very popular colour on Valentines Day [http://www.youtube.com/watch?v=l43rqt12KcE] which is seen as a very romantic day where many people buy cards and flowers and even plan special occasions for the ones they love. The many colours on this pamphlet achieve their purpose by creating a romantic feeling or mood and that will hopefully lure many people who like romantic films to watch this particular film. Another visual feature that helps to achieve its purpose is the font sizes and writing style of the text on the film pamphlet. Font sizes and styles can be used to help create a sense or mood by doing things such as looking if as though the writing were done in blood, this would create a sense of horror or danger. The title A Touch of Spice on the film pamphlet is the most large and clear because of its background. The title is usually in the largest font and in this case, it is no different. This is used to hopefully gain the attention of the consumer to come and watch the film or pick up the pamphlet. The title is written in a very natural way so it makes it seem as  though someone had put some spices on a table and written the titles out with their finger. It is quite cleat that the font is not times new roman because there are lines that are sticking out of the letters which creates the effect that to make it seem as though as if it were written. By having the title in such a way it creates a mysterious and exotic feel. On the back of the film pamphlet, there is a small section of writing where it is obvious that it is in a foreign language. The small section in a different language almost guarantees that the film will be from another country. Using this technique, it will be able to attract as much viewers as possible who like foreign films and in turn achieve its purpose. A very effective technique on this particular film pamphlet would be the logo. A logo can be used to help the advertisement gain the attention from consumers such as the Sony logo on one of their products. The logo on their product would tell the consumer that the product was at a very high quality because of their reputation. On this particular film pamphlet, a logo or badge has been put in the corner of it saying that is was the no.1 film at the Greek box office for an amazing 7 weeks. This would assure many viewers that the film would be good because of its great performance in Greek. The logo achieves its purpose by hopefully building a good reputation, which the quotes on the back of the pamphlet also do, so it is able to lure as much viewers as possible to watch the film. A language technique that is used on this particular film pamphlet is repetition. Repetition is often used to help send a message across to a viewer and help them to remember the message that was put across. Repetition is ubiquitously found on the cover of the film pamphlet. The theme of spices and food is found all over the cover of the film pamphlet in simple sentences. Cinnamon is bitter and sweet, just like a womanA beautiful, touching romance that will leave you craving for moreSalt is used as needed to spice up ones lifePepper is hot and scorches, just like the sunAll of these sentences, which are all found on the front cover, refer to a theme of spices and food and then link the food to another subject such as a woman or life. The  repetition on this film pamphlet is attempting to reinforce the title A Touch of Spice which emphasises the fact that the film is a romantic film and would leave them craving for more. The repetitive messages of spices and links to romance would have been received by the viewer and so achieves its purpose so enticing them to come and watch the film. Another language technique used on this film pamphlet is adjectives. Products and services are usually described with adjectives to hopefully appeal to consumers to purchase the product. In this particular case, adjectives are not used to describe the film itself but to describe other things which the film is relating to. The film pamphlet compares spices to things such women. Cinnamonis better and sweet just like a womanPepper is hot and scorches, just like the sunBoth of these quotes contain adjectives to describe spices and link them to romantic themes. The second quote links pepper to the sun where they say both are hot. This creates a sense of passion and exoticness to viewers so they understand that this film is a romantic one. Another language feature that is used to help the film pamphlet achieve its purpose is persuasive language. Persuasive language helps to convince consumers by using powerful and effective language to hopefully get people to buy the product. On the back of the film pamphlet, there are four quotes from people who seemed to have watched the movie and enjoyed it. A film of international standards and genuine emotionis undoubtedly one of the best gastronomic movies I have seen.an intensely moving experienceAll these quotes are the reviews or opinions of those who have already watched the film. The people who created this particular chose these reviews because it is their opinion that the film is of a very high quality. By getting the message through to the consumer that the film is actually good, more people would be interested to watch the movie so the film pamphlet has achieved its purpose. A layout technique which has been used on this film pamphlet is text boxes. Text boxes are usually used in ads to help make the ad easier to read and to  help all of the text to stand out. For this film pamphlet, there are many text boxes because there are many sections of text on the back with equal importance. On the back of the film pamphlet, there are many quotes which praise the film and the advertisers would have wanted to make sure that the viewers did not miss that section. The blurb is also in a text box and that is where the creators of the film give their own description of the film and where they give their own praise. Boxes have not been only to help text to be read more easily but also for images to stand out. Since there are many pictures on the back cover of the film pamphlet, they can be made more easily seen and recognised if they are in boxes. Text boxes have been effectively used in this film pamphlet to help important information to be unmissed and easily read and that is how they achieve their purpose. The film pamphlet is created to help attract as much viewers as possible to watch their movie. The film pamphlet attempts to do so by using visual, language and layout techniques to help inform people that the film is of a high quality so they can persuade as many people as possible. bibliography: pamphlet 1994

Leyte Gulf

The Battle of Leyte gulf was known historically as one of the most decisive battles won by the U. S army in their attempt to regain control of the Philippine Islands during the second world war. This was the battle which made it possible for the renowned General Douglas MacArthur to make good on his promise to the Filipino people that â€Å"he is going to return† to free them from the cruelty of the Japanese.The four-day battle of Leyte Gulf in October 1944 marked the eclipse of Imperial Japanese naval power, the last sortie in force of the Imperial Navy, and the largest naval battle ever fought on the face of the earth.Obviously this armed confrontation between the U. S forces and the Japanese Imperial army was an offshoot of an even greater war; the second World War, which was undoubtedly the largest and most violent armed conflict in the history of mankind. It is still as of the present, the most destructive war that ever took place. The Carnage wrought on this war dwarfs a ny known casualties the world has ever known when it comes to wars that historically took place. This war utilized technology in all aspects of weaponry and battle tactics.Battles were fought on land, on sea, and in the air for a period of approximately six years. This great war still continues to rouse the interest of military scholars and historians, as well as bring fresh recollections of the devastation to both the victorious and vanquished forces who fought on that war. The intervention of the Americans in the second world war took place on the month of December 1941. The Japanese succeeded to demolish Pearl Harbor, which was then known as the greatest naval base in the Asia pacific region.The Japanese used stealth and treachery to succeed in this endeavor. Within hours of the destruction of the United States Battle Fleet at Pearl Harbor, the Japanese forces began their assault on the Philippine islands. 5 months later on the month of April 1942, the Fil-American fortress in th e Bataan Peninsula fell, and with it the majority of the combined Fil-American forces were captured and incarcerated by the Japanese Imperial army. Two and a half years after the fall of Bataan Allied forces began the reconquest of the Philippines with major landings on Leyte.Four months prior to the Leyte landings – at the Battle of the Philippine Sea – the Japanese Imperial Navy made a desperate attempt to defeat the US fleet with carrier-borne aircraft. Needless to say, the Japanese army was dealt a major blow when they lost nearly 200 of their aircrafts in one afternoon and lost nearly 500 carriers and land-based aircrafts in two days. The Superiority of the equipment used by the American forces caused the massacre of the Japanese forces.As a result of the destruction of their aircrafts and carriers, which at the start of the Pacific war was the most feared of units, and usually at the frontlines of the Japanese offensive, the Japanese airforce amounted to nothing more but decoys in the Leyte campaign, and the task of making the real attacks on the Allied invasion fleet was of necessity left to the Japanese Imperial army's battleships and heavy cruiser forces, which were still largely intact, and to what land-based support the Japanese army could still muster.II. Strategies involved in The Battle of Leyte Gulf After the decisive battle of the Philippine sea, the U. S forces were contemplating as to what course of action should be taken. In the end two factions were opposing each other as to what strategy should be employed to regain control over the Philippine islands. One of these faction, was composed of the Navy, led by Admirals Nimitz and King, wanted to take Formosa by using the â€Å"island-hopping strategy†.They believe that in order to neutralize the Japanese Army garrison by air blockade, they must secure the island of Formosa, this island is located strategically along the seaways from the Dutch East Indies to Japan, and as s uch would serve as the perfect base for the â€Å"economic strangulation† of Japan. The said Island would also be ideal to serve as base for the impending final attack on Japanese Territory. On the opposing side was General Douglas MacArthur, Commander of the South-west Pacific Forces. Surprisingly, He believed that military reasons alone should not control the pace of the action.It is of common knowledge that his stand was also based on political considerations. He wanted to regain control of the Philippines because of the following reasons: The first reason being given was that he wanted to fulfill his promise to the Filipino people that â€Å"he shall return† to liberate them from the cruelty of the Japanese. The second reason being given is because of his conviction that leaving the Philippines in Japanese hands would be an â€Å"irreversible loss† of American prestige in Asiatic eyes. In his plea to President Roosevelt, he reiterated that the U.S could not afford to ignore the political implications of its military planning. A return to the Philippines involved a compelling political dimension that did not apply to Formosa. The Philippine Islands had been a colony of the United States since 1898, and the inherent politico-military responsibilities arising from that relationship could not be taken lightly. It was on those grounds that General MacArthur and others insisted that the United States had a moral obligation to liberate the Republic from the cruelty of the Japanese as soon as possible. The faction led by General MacArthur eventually won out.The decision as to what course of action would be prioritized was made by President Roosevelt himself. He was convinced by General MacArthur that it is America’s moral obligation to liberate the Republic's 16 million citizens from harsh Japanese occupation as soon as possible (it is also probable that he did this because of political reasons). As a result, by the summer of 1944, the American forces succeeded in fighting their way across the Pacific on two lines of attack to reach a point 300 miles southeast of Mindanao, the southernmost island in the Philippines.In the Central Pacific, forces under Admiral Chester W. Nimitz, commanding the Pacific Fleet and Pacific Ocean areas, had island-hopped through the Gilberts, the Marshalls, and the Carolines. More than 1,000 miles to the south, Allied forces under General Douglas MacArthur, commanding the Southwest Pacific area, had blocked the Japanese thrust toward Australia, and then recaptured the Solomons and New Guinea and many of its outlying islands, isolating the huge Japanese base at Rabaul. The American invasion was concentrated mainly on Leyte Gulf, in the central Philippines.Earlier plans had called for an invasion of the southern island of Mindanao as the next stepping stone in the successful â€Å"island-hopping† campaign employed to date by the two fleets in the Pacific – the Third Fleet un der Admiral Nimitz, and the Seventh Fleet under General MacArthur. But, with the apparent collapse of the Japanese fleet and air power, the plan to invade the central Philippines was advanced two months from December to October of 1944. The Seventh Fleet, under MacArthur would conduct the actual invasion.It must be noted that there was no overall naval commander during the Leyte campaign, which almost inevitably led to great confusion in the forthcoming battle, and in the event nearly led to a strategic disaster for the Allies. Fortunately for them, it was destined that the allied forces triumph over their adversaries. The War between the United States and Japan was constantly shifting in momentum. It was noted that during the latter part of 1944, it was becoming apparent to Japan that highly desperate measures had to be imposed if they are to stem the massive onslaught of the U.S Forces. The strength of Japan's archenemy in the Pacific has been growing at a steadily alarming rate, different by far from the forces it had decisively routed during the treacherous bombing of Pearl Harbor and its successful conquest of the Philippine Islands. It is becoming frequent that nearly every time the Japanese Navy came to blows with the United States Navy in a fleet action, the Japanese Navy took a terrible beating. Most of the Japanese navy had been based at Brunei on the island of Borneo, close to its oil supply.Unfortunately for them the remnant of the fuel was all but exhausted, leaving them only unrefined oil, which could barely be utilized in their warship boilers. To make matters worse the Air Force of the Imperial Japanese Navy was all but obliterated, too. After the Battle of the Philippine Sea (a. k. a â€Å"The Great Marianas Turkey Shoot† by American pilots because of the apparent target shooting practice which ensued. The target being Japanese aircraft) Japan lost the majority of her Air force and had only as a remainder, a handful of planes, and even fewer pilots to fly them.Because of this, her carriers were largely useless for any practical duty. Except, perhaps, to serve as decoys to lure away the American forces in minor and major engagements. The Japanese Army knew in their hearts that if they lose or relinquish their hold on the Philippine islands there is a very huge possibility that they may also lose the war. This instinctive assessment of what might take place if they lose their foothold on the Philippines spurred them to conduct some desperate counter measures against their enemy.They therefore drew up a plan which risked their remaining surface forces, but offered them a slim chance of destroying the American invasion fleet and isolating the Allied ground forces on Leyte. Like many previous Japanese operational plans it depended on the use of a decoy force. The Japanese was ready to play its cards to the hilt with the full realization that the ensuing result could either be victory, or the destruction or incapacitati on of the Japanese Navy. Nothing was held back, as there was everything to gain and substantially nothing to lose (since they are losing anyway) .The Japanese knew that If this mission failed, the war would be lost. The plan that was conceptualized was nothing short of brilliant if things turned out as they have calculated. Unfortunately for their cause, an accident saved the day for the U. S forces. The plan was that Admiral Ozawa was to sail in from the North East with his â€Å"bait† of four aircraft carriers, and the two hybrid battleship-carriers Ise and Hyuga featuring four battleship turrets forward, and small flight decks aft. But, for this mission, they would carry no aircraft at all, as none were available.Even the large fleet carriers were not carrying a full complement of planes. At this stage of the war, the Japanese have already lost most of their trained pilots which forced them to depend on untrained aircrew to fill up the gaps. The said units were therefore s elected along with a dozen ships to play the role of decoy. The decoys were assigned to draw the main American force, with the intent of having two powerful battleships penetrate and then stealthily attack the American invasion forces in the Leyte Gulf.The southern and weaker of these battleship forces, commanded by Rear Admiral Nishimura, would penetrate through Surigao Strait just south of Leyte. The more powerful of the two battleship forces, the Central Force under the command of Vice Admiral Kurita, containing five battleships including the giant Yamato and Musashi ( the largest warships in the world ), 10 heavy and 2 light cruisers, and 15 destroyers, would penetrate through San Bernadino Strait, sail down the coast of Samar, and fall on the American invasion fleet from the north-east.The forces which were supposed to counter the Japanese naval maneuvers were led by Admiral William Halsey. Admiral Halsey was a war veteran who hated the Japanese with an intensity almost akin to loathing. According to some of his subordinates Halsey was nothing sort of the extraordinary, and is definitely not known to be an intellectual. His leadership was often successful because he had the talent to choose good staff, who apparently analyzes and decides things that needs to be done, which was done quite often. It was noted that he seldom overruled their suggestions.It was also noted that while he always acts like a true professional and exacts professional performance from all subordinates, he had this charismatic effect on them which was like being touched by a magic wand. Anyone so touched was determined to excel. † This characteristic along with his inherent loathing of the Japanese forces made him a very controversial figure on this armed struggle. This personality of Admiral Halsey explains a lot concerning all of his decisions which could have caused the momentum to shift from the U. S forces to the Japanese forces.As a counter measure against the Japanese, A dmiral Halsey ordered 2 minor fleets to steam north at 25 knots. He ordered the dispatched units to join Sherman's Group and attack Ozawa. By midnight the dispatched units, including Admiral Lee in Washington and Admiral Halsey in New Jersey with all their battleships and cruisers, were tearing north. Halsey incorrectly assumed that Kurita's Center Force is not a serious menace. This proved to be costly error as may be gleaned from the engagement which later took place. He ordered Admiral Kinkaid to attack any major enemy naval force approaching from the north.Unknown to him, they are actually playing to the tune the Japanese forces are playing. Admiral Halsey regarded the Japanese carriers as the main threat which must be annihilated to secure victory for the U. S forces. His strategy was to focus his three available carrier groups, with all their accompanying vessels in destroying Admiral Ozawa’s ships. In his eagerness and haste to act on this supposed war strategy, Halsey took no steps to protect Seventh Fleet from the Centre Force. The third Fleet left San Bernadino Strait entirely unguarded. This was a major blunder which could have caused them to lose the battle.It was even said that â€Å"not so much as a picket destroyer was left†. It appears that he also did not take the necessary precautions to safeguard their forces if by chance a blunder was commited. This was evidenced by the fact that he neglected to even inform Kinkaid that the Strait was Not now being covered by the Third Fleet – instead the Seventh Fleet commander had to rely on an intercepted signal from Halsey to his task group commanders, which indicated that the Third Fleet commander was going north with the three carrier groups to strike the enemy’s Northern Forces.It was very fortunate indeed that the Seventh Fleet had intercepted an earlier radio signal from Halsey which outlined a plan to form Task Force 34 – a very powerful surface force built aroun d the Third Fleet's fast battleships, this was commanded by Vice Admiral Willis Lee. If this accident did not occur, the casualties on the American side would have been astronomical. When Halsey's 2022 message was received, Kinkaid and his staff, assumed that the â€Å"three groups† referred to were the carrier groups of Third Fleet, and that Task Force 34 had been left behind to guard San Bernadino Strait.The funny thing was that Task Force 34 had not yet been formed, and all the ships which it was expected to contain were heading northwards with the American carriers. Meanwhile the Seventh Fleet, unconcerned about any threat from its northern quarter, and feeling fully confident that the Centre Force would be dealt with by Halsey and the Third Fleet, continued with its preparations to meet the Japanese Southern Force in Surigao Strait.It was historically recounted that Admiral Ozawa steamed down from the north, presenting what was hoped to be the irresistible targets of Jap anese flat tops (including the Zuikaku – the last remaining veteran of the Pearl Harbor raid. ) Meanwhile, the surface units of the Japanese Navy would sneak in from the west under the command of Admiral Kurita, and attempt to spring a deadly trap on the Seventh Fleet.A small force consisting of the battleships Fuso and Yamashiro and supported by the heavy cruiser Mogami and four destroyers would sneak through the Surigao Strait, preceded by three more cruisers and four destroyers sailing in from Japanese home waters. But the main force of the attack was to come from another direction. The said units sailed from Brunei, all in all it was a substantial force composed of five battleships (including the aforementioned Yamato and Musashi) twelve cruisers and fifteen destroyers.It was supposed to sneak through San Bernardino Strait, loop around the island of Samar, and smash the Americans through it’s blind spot. The actual conflict as envisioned by the Japanese would have â€Å"the hammer and anvil† attack which would â€Å"sandwich† the American forces with attacks from both the Northern and Southern directions, the Seventh Fleet would have nowhere to run, and nowhere to hide. The impending approach of the Japanese surface vessels was revealed subsequently when the American forces sank two enemy cruisers.The next day, Seventh Fleet units attempted to block the southern approaches to Leyte while Third Fleet aircraft began attacking the main surface task force. The Aircraft units saw the four enemy units which acted as decoys. Admiral Halsey took his Third Fleet carriers and battleships in hot pursuit of the decoys, which made it possible for the two Japanese surface task forces, to move towards the Leyte Gulf without being harassed by any Air force unit. As expected by the Japanese, the Seventh Fleet battleships sank or turned back units of the smaller Japanese attack force which acted as decoys.Unbeknownst to them, the second and large r task force, which included the super battleships Yamato and Musashi, successfully moved through the San Bernardino Strait, then south along the east coast of Samar Island, northeast of Leyte, to within range of the soft support shipping which was being handled by General MacArthur. This sudden attack by the Japanese forces was due to Admiral Halsey’s plan to dispose of the Japanese carriers, which he sees as the principal threat to the Leyte campaign.. His dash north, to get to Admiral Ozawa's carrier fleet, left the critical passage of San Bernadino uncovered.the battle unfortunately did not go as Halsey had planned. Althouugh his fleet sank the four carriers of Ozawa (which were decoys), it missed the two battleships, and a major part of the escort units. Admiral Kurita's Center Force has managed to slip by, and attacked Kinkaid's forces which were covering escort carrier force â€Å"Taffy 3†. If Kincaid did not accidentally intercept and misinterpreted Admiral Hal sey’s command by escorting General MacArthur’s carrier, things would have gone ill for the Philippine conquest and the American cause as a whole.To give credit to Admiral Halsey, he managed to turn his forces around to the aid of Admiral Kinkaid’s forces, Halsey has sunk four carriers, a super battleship, and several smaller ships. He had lost the Light Carrier Princeton, and jeopardized the invasion beaches. Halsey was responsible for destroying the Japanese fleet, which included carriers but was not restricted to them. Halsey failed to see which force was more dangerous, and paid the price. The casualties suffered by the American forces because of this blunder amounted to 898 dead soldiers and 913 wounded. In addition to the human casualties the U.S Navy lost six warships. The Japanese lost an estimated 80,000 combat ready troops in their failed defense of Leyte. Their losses at Leyte were heavy, with the army losing four divisions and several separate combat units, while the navy lost 26 major warships and 46 large transports and merchantmen in the campaign. On the morning of 25 October, after two and one half hours of desperate fighting by light U. S. Navy escorts, the Japanese battle fleet mysteriously broke off the engagement and withdrew from the gulf, thereby leaving unexploited the opportunity presented by the Third Fleet's departure.To the north, the Third Fleet caught up with the Japanese carriers and sank all four of them. These encounters, later known as the Battle of Leyte Gulf, represented the largest naval battle in the Pacific. Americans and Japanese came away from the battle of Leyte Gulf with extremely divergent views of what had occurred. These different assessments provoked planning revisions which completely changed the character and duration of the battle for Leyte. The Americans believed they had dealt the IJN a severe blow; events later proved them correct.But in the immediate aftermath of the sea battle, Japanese commanders believed they had ruined the American carrier force. In fact, they had sunk only one light and two escort carriers and three destroyers. Nevertheless, convinced that they had won a major naval victory and bolstered by reports of air victories in the ten days before A-day, Southern Army resolved to fight the decisive battle on Leyte. III. Conclusion The Battle of Leyte Gulf was instrumental in the American conquest of the Philippine Islands. If the U.S forces proceeded to immediately invade the island of Luzon, the casualties might have been heavier considering that the Japanese forces in that region was estimated to number 250,000 troops. The Battle of Leyte Gulf was indeed a decisive battle considering that it was instrumental for the destruction of the once powerful Japanese Imperial Navy. As a result of devastating blow dealth to the Japanese Navy, it never ventured out again in force to challenge the superior and overwhelmingly powerful American Navy.This battle also introduced the terrifying method used by the Japanese pilots to the western mind, the kamikaze tactic, which undoubtedly revolutionized the concept of patriotism and sacrifice among soldiers. As a whole, the Japanese decision to stake everything on the battle for Leyte only hastened their final collapse as they lacked the ability to coordinate the mass of air, ground and naval forces that they committed to the struggle, which led to the emergence of the U. S as a power to reckon with up to the present times.IV. Bibliography Morrison, S. (1962). The Battle for Leyte Gulf http://www. angelfire. com/fm/odyssey/LEYTE_GULF_Summary_of_the_Battle_. htm James, D. Admiral Halsey's Decision http://www. odyssey. dircon. co. uk/Halsey_decision. htm Donovan, R. The Wartime Adventures of President John F. Kennedy http://www. odyssey. dircon. co. uk/Halsey. htm Lanzendorfer, T. Glorious Death: The Battle of Leyte Gulf http://www. microworks. net/pacific/battles/leyte_gulf. htm â€Å"Turkey Trots to Water† â€Å"http://www. battleship.org/html/Articles/History/Leyte0. htm The Beginning : The Battle of Leyte Gulf http://www. battle-of-leyte-gulf. com/blg_synopsis/blg_synopsis. shtml Morison, Samuel E. , History of United States Naval Operations in World War II, Leyte, Volume XII (1984), Little, Brown and Company, Boston Potter, E. B. , Bull Halsey (1985), Naval Institute Press, Annapolis, Maryland Cox, J. , The Battle of Leyte Gulf Casualty list, Copyright Robert Jon Cox 1996-2001 http://www. bosamar. com/usforces/casualty. html

Case Commentary Essay Example | Topics and Well Written Essays - 1500 words

Case Commentary - Essay Example The bone of contention was that while domestic companies were allowed to set their own individual baselines, the foreign companies were not allowed to set their own baselines and had to comply with those established by the Act.12 The US government argued that while it was possible to evaluate the small number of domestic companies compliance with the Act based on their baselines, using the same approach for foreign companies that were more in number would place an unjustified quantitative pressure on the Environment Protection Agency (EPA). The statutory baselines for the foreign companies were, therefore, necessary to allow EPA function. They further argued that the Act was absolutely necessary and in compliance with Article XX for human health protection, clean air and conservation of exhaustible natural resources. This case was unique in that while it pursued the greater environmentalist goals, it was based on trade disputes thus its arbitration by the WTO appellate body was justified.34 On 24th January 1995, Venezuela requested a WTO address while Brazil did the same on 10th April 1995. The two countries alleged that the US Clean Air Act discriminated against their rights and violated the General Agreement on Tariffs and Trade (GATT) Articles 1 and 3, and Technical Barriers to Trade (TBT) Article 2. On 10th April 1995, a panel was set up to review the complaints and evidence presented by Venezuela. The panel was finally formulated on 26th April 1995. Upon a request from Brazil, a third panel was set up on 19th June 1995 to specifically review Brazilian complaints and evidence. On 31st may 1995 it was decided that the two panels reviewing Venezuelan and Brazilian evidences and complaints be coalesced into a single panel. The decision to coalesce the two panels was reached in accordance with Article 9 of the Dispute Settlement Understanding (DSU).56 The panel concluded its review and

Should the UK government return to a policy of full state financing of Essay

Should the UK government return to a policy of full state financing of student - Essay Example In recent years, education, specifically higher education, stood as one of the most contentious topics of discussion in public policy forums and government policymaking in the UK. As witnessed, several academic changes have been instigated, others have remained pending, and in some quarters, significant reform packages have been put forward, on the drawing board ready for deliberations or are presently being deliberated upon. In the UK and in other countries of the world, higher education is confronted with three problems - universities are inadequately funded, escalating apprehensions about quality, the dearth of student support, proportion of students coming from underprivileged environments is deplorably insignificant and the financing of universities is in the state of collapse since money is sourced from general taxation, however, the beneficiaries are those coming from more affluent conditions (Barr, 2003, p.371). The plan to restructure higher education (HE) funding has caused so much controversy. Much of the wrangling has been centered on what the reforms will mean for those students coming from different family income backgrounds and the level of liabilities they will shoulder in their higher education experience. Likewise, apprehensions have been brought up on how the graduates will be affected by these debt repayments all through their working lives, as well as whether or not the funds raised will significantly improve the condition and circumstances of universities (Dearden, Fitzsimons & Goodman, 2004, p. 5) Brief Statistics At present, there are 168 higher education institutions in the UK, of which 90 are universities. In the years 2002-2003, enrollees reached up to 2.2 million in UK universities and colleges. In England, the participation rate for 18-30 year olds in higher education was 44%. In the same period, there were 184,700 international students studying in the UK, as well as 90,600 from the EU. Universities employ more than 300,000 staff; 1.8% of the total UK labour force. UK's higher education generates an annual 4 billion in foreign earnings and education and training exports are worth 10.2 billion. Public funding of higher education per student dropped by 37% between 1989 and 2002. During the same period student numbers grew by 94%. Source: Universities UK, Manifesto, General Election, 2005 A Quick Look at the Proposals January 27, 2004 saw the endorsement of the Higher Education Bill by the MPs which aimed to eradicate tuition fees for students and institute variable fees of up to 3,000/year from years 2006-07. In this plan, graduates will be allowed a sponsored Graduate Contribution Scheme or GCS loan equal to the value of their fees. Likewise, graduates from 2009 will put in 9% of earnings over and above 13,925 every year to pay off the loan. In line with inflation, the outstanding value of the loan will expectedly increase each year, with any amount left unsettled after twenty-five years being cancelled. Another scheme calls for students of underprivileged backgrounds to receive financial support of at least 300/year if full top-up fees will be charged by the institution. With the most recent proposals, students

Service Operations Management Team Project Essay

Service Operations Management Team Project - Essay Example The third member will be given the task of both internal and external communication and the identifying of new service opportunities for the organization. The member will be engaged on mobile communications and the linkages to the social sites including Facebook and Twitter. The fourth member, will be responsible for marketing, and will have to work together with the third member to leverage on the communication capabilities. The project will majorly pursue Mobile marketing because it has been realized that majority of the target customers are on mobile communication platforms. Every organization and project team requires a decision on the appropriate timings in order to realize the strategic plan. Since this project involves consultancy, it is easier for the project management process to run by dividing the tasks into four subtasks, logistics, co-ordination, communication and marketing. For example, the coordinator will only be concentrating on the decision on the timings of event. When a client needs to be attended to by the organization, the coordinator will decide on the timing of when the client will be attended to depending on the available work force and other resources. The member in charge of logistics will therefore be of great significance when the resources are required, for example, transporting the staff members to the site to offer the consultancy services. In order to get information from or pass information to the clients, suppliers and other service providers, the member in charge of communications does the communication on the various ch annels to present the consultancy services to them and offer necessary information. During the service delivery, the person will maintain the contact with the client until the service is completely delivered. There will be need for the person to collect the opinions of the clients from the communication channels concerning the quality of services they receive from

How do you measure political corruption, and what are the difficulties Assignment

How do you measure political corruption, and what are the difficulties involved - Assignment Example Another important form of this type of corruption is extortion. Here the political persons get involves in various criminal offences for acquiring property, money etc from an individual or institution through illegal means. Political corruption depends on the jurisdiction and country. The practice of political funding differs from places to places. In some places considered as legal and in some places are considered as illegal. In many places government officials have indefinite powers. There the distinction between illegal and legal power is difficult. Institutional corruption is also included in political corruption. The problem of corruption in institute which is associated with the economic support from the government officials who have different interest related with the institution. Political corruption has a negative effect on the good governance and democracy of the country. It reduces the accountability in legislature and election. Corruption in politics hampers the represen tation process in policy making. Political corruption also leads in the compromising the rule of laws. This type of corruption often occurs at the higher levels of the state which a strong impact on politics. Political corruption leads to the improper use and resources misallocation. It influences the political system and government institutions. As a result institutional decay is a common phenomenon in this type of corruption. It is a deviation from ethical code of conduct and written legal norms by the ruling political party. The ruler systematically abuses the rules and regulations of the state to fulfil their personal gains. It is also perceived as an ignorance of principles and rational legal values of the state. The legal base of many authoritarian countries is weak. This helps to grow political corruptions and subjects to the downfall of their political system. Moral, ethical and normative standard are the necessary benchmarks to differentiate legitimacy from legality in

Music Course at the University of California Essay - 1

Music Course at the University of California - Essay Example I had also learned a lot from my experiences the need to maintain mutual respect and concern among the band members and to develop as part of a team and retaining one’s individual talents and identity at the same time. Though I have taken classes to learn the various musical instruments I play, my broad interest in different musical genres has also contributed towards the expertise that I have gained. I believe in the power of music that emerges through group efforts. Therefore, I had always been in the company of those who are passionately involved with music. The different experiences that we have had with music had been a binding force among us, and it eventually led to the formation of the jazz band. The suggestions and criticism from my colleagues have motivated me to strive for a better quality of playing the musical instruments, and I believe that I have achieved that goal with the help of constant training and practice. Now I can claim that I have reached the level of versatility that is expected of a seasoned band player but am aware that music is an art form which calls for an innovative spirit which is willing to keep learning more and more. This explains my interest in a systematic learning of music as a major in a well-reputed university. Though I have specialized in various musical instruments, I would like to explore the possibilities of learning more related instruments with dedication. However, my ambition is not just to master as many musical instruments as possible.

Bonnie and Clyde(Penn, 1967) Essay Example | Topics and Well Written Essays - 1500 words

Bonnie and Clyde(Penn, 1967) - Essay Example Bonnie and Clyde can be easily put under the genre of crime films. These are the movies that have a plot revolving around the life of a criminal. The character could be someone as real life as conceivable or someone so villainous that the viewer feels that he could not possibly be real. Then there are some which are based on the lives of actual felons. Often, films portray the life of criminals to be exciting and glorified, and this movie is one of those. It gives a glimpse of how life as a wanted person could be like, all the rush and adrenaline and yet the worry that must be constantly at the back of their mind of being caught even if they are arrogant and act otherwise. Such movies give the watcher an inside look to how a criminal’s mind could be like (Barsam and Monahan). The story is set during the times of the Great Depression when practically everyone was unemployed and money was short. In turn, these events resulted in a rise of criminal activity since the only way tha t the people could afford to put some food in their belly was by stealing the food. One of those persons was Clyde Barrow. It is whilst he is trying to steal a car when he meets Bonnie Parker, a waitress who is, surprisingly, the daughter of the owner of the very same car – â€Å"Hey boy, what you doin' with my Mama's car?† (Newman, Benton and Towne). However, instead of creating an outcry, she helps Clyde and they manage to run away in the car. That makes her first crime stealing her mother’s car but Bonnie has no regrets as she is quite excited and is looking forward to a new way of life. As Arthur Penn explains, â€Å"the American negro has the same kind of attitude of 'I have nothing more to lose' that was true during the Depression for Bonnie and Clyde.... He really is at the point of revolution -- it's rebellion, not riot† (Friedman 84) The duo start small, they go around gas stations and such. However, when their increasingly expensive lifestyle re quires them to have more money, they raise the scales. They start robbing banks, figuratively spitting on authority that turned its back to them and so many others despite all their promises made in the past, even introducing themselves as â€Å"This here's Miss Bonnie Parker. I'm Clyde Barrow...We rob banks† (Newman, Benton and Towne). Throughout the movie, the viewer may notice the subtle way that the Robin Hood theme has been continuously showcased. The two are stealing money from those who shut themselves down and refused to lent money to the poor in their times of need. In fact, the banks collapse and with them sink all the money that the ordinary people had cashed in their accounts as savings for the future. There is also a scene during one of the robberies at the bank when a farmer who had dropped by is allowed to keep all his money with him. It is through these little gestures that they show that are just ordinary folk. They are two thieves stealing money and living t heir life as they want it to be despite the terrible times and all the uncertainty that the normal public are feeling. It is clear since the beginning of the movie that Bonnie and Clyde are instantly attracted towards each other. Romance taking place in the future is a definite yes. The pair have a fun time together, meeting people they like and dislike but enjoying life to the fullest. Still, it is not all

The Speech’s Organization Essay Example for Free

The Speech’s Organization Essay George Clooney gains attention of the audience right away. He says: â€Å"I won’t try to educate you on the issues of Darfur.† By saying this, Clooney acknowledges the audience’s expertise and points out that the purpose of his speech is not to educate them, but to urge them to act appropriately on the issue. Also, Clooney starts off with a stable pace, which does not change throughout the whole speech. In the body of the speech, Clooney states that he is the representative for the people who cannot speak for themselves. With this statement he gains credibility right away, and lets the audience know that he represents not only his own, but a collective point of view. Clooney proceeds with statement that UN needs to act immediately on the issue of Darfur. Thus, he stresses his attention on the sanctity of human life by saying: â€Å"my job is †¦ to beg you on behalf of the millions of people who will die and make no mistake; they will die for you to take real and effective measures†¦Ã¢â‚¬  While saying this, Clooney keeps straight and serious face, which adds more pathos to his words. Towards the end of the speech, Clooney starts to blame UN for inaction by blaming the organization for the conflicts in Rwanda, Cambodia, and Auschwitz. Therefore, he addresses to the audience with a harsh statement: â€Å"So, after September 30th, you wont need the U.N. You will simply need men with shovels and bleached white linen and headstones. In many ways, its unfair, but it is, nevertheless, true that this genocide will be on your watch†. Even though, Clooney makes harsh arguments, he manages to deliver strong message to the audience and warns them to act immediately on the issue. Towards the conclusion, Clooney becomes less harsh and goes softer. He asks the UN to start acting on the issue of Darfur, and points out there must be no waste of time regarding the decision-making. By the end of the speech, Clooney says: â€Å"We believe in you so strongly. We need you so badly. Weve come so far. Were one yes away from ending this.† This statement, probably, was the most influential part of the speech, because Clooney begs UN to start acting on the Darfur conflict and his speech finishes with a question: â€Å"So, what is next?† The Rhetorical Situation George Clooney is known worldwide as an actor, producer, and screenwriter. However, Clooney is not only a Hollywood star, but also a political activist. After delivering the speech on the conflict on Darfur, he was named â€Å"messenger of peace† by the United Nations. Thus, Clooney has all the necessary skills for public speaking. Consequently, Clooney effectively uses rhetorical tools and delivers his speech to the audience with slightly harsh and attacking way. Delivery Throughout the whole speech, Clooney maintained strong eye contact with the audience. Also, his pace remained during the whole speech. He was not rushing, but rather trying to stress attention on every word. Clooney had great vocal variety; his voice was loud and clear. The articulation was on the high level, and it was easy to understand everything that he was saying. For the body language, it was visible that Clooney was trying to hide his hands, as he kept them crossed on the table. By doing this, he has created the feeling that either he was hiding something or was not completely honest about what he was saying. Even though, the speaker was passionate and persuasive, he was reading too much from his notes. His speech was quite short, thus, he could have memorized it and he could have more impact on the audience if he did not use any notes. Also, Clooney’s speech sounded bit too harsh. Sometimes it seemed like he was trying to blame UN for everything bad happening worldwide.

Essay Example for Free

Essay Most people think â€Å"we† are becoming more equal through out history. Although, the reality is that we repeat history. Between class, gender, and race the recreation of systems of discrimination is repetitive. With that being said I will introduce five facts that reflect social construct relating to class, gender and race in America. Class is a set of concepts that society has created to measure ones income, wealth, and status. While, there is not a direct definition of class it is a huge aspect of the way we live our lives. I will break down class within the way society measures it. Income is based on the particular money or revenue an employee is bringing home. Meaning wealth is significantly associated with income plus the material things an individual owns; for example expensive cars, land, or any ownership that shows fortune. In theory, status is the exemplification of inheritance, for example a family business, a home or even something as small as jewelry. The Daily Conversation displays a visual by a Harvard business professor whom interviewed five thousand people on their view of wealth inequality in America (YouTube, 2014). As shown in the YouTube video Wealth Inequality In America Daily Conversation proves that society has no authentic awareness on the way wealth is spread among the American people. Out of the five thousand Americans interviewed they thought that the top twenty percent of wealthy people were almost as half the amount of high-middle, middle, and poor class wealth. Ninety-two percent of those people think the ideal wealth should be dispensed nearly equally among the top twenty percent wealthy and middle class with a less portion to the poor class. In reality the top twenty percent of wealthy Americans are roughly three-fourths the wealth compared to the middle and lower class. As mentioned in the article Mobility, measured it shows that â€Å"America is no less socially mobile than it was a generation ago† (The Economist, 2014). The image showed before the article displays a triple bunk bed related to the differences’ between social class constructions. On the top bunk posi tioned the wealthy percent of the population with only two characters, a man and woman. Underneath the middle class is placed then demonstrated as the educated. Next the poor or lower class is detained in a filthy and packed environment. On the sides of the bunk bed are ladders. On the left is a character that seems to be educated and excited to move up the ladder to the top wealthy percentile. Also on the left another educated character is  falling off the ladder showing the immobilization of society. There are many reasons why social mobility is decreasing over the years. Such as the correlation between parents and children, â€Å"†¦the odds that a child born into the bottom fifth of the income distribution will climb all the way up to the top fifth† (The Economist, 2014) is nearly unmanageable. Statistics show that this correlation has not altered over years. Although there is evidence that mobilization is lessening, Americans still believe that the lower class has a chance at climbing the ladder and succeeding, just as mentioned in the YouTube video previously. It may seem nevertheless that class is the only contribution to each individual’s well-being but everyone has intersectionality in society. Class, gender and race include all aspects of who we are and where we are placed among the spectrum. Gender roles are a huge democracy in today’s American society. Yet, they are different in all types of cultures in different parts of the world. It was simply that the women was a housewife and contributed to the man of the household and children as her job. Furthermore the men’s job was to work and bring home the income. Society presents these different types of roles through everyday media. The cheery blossom market mentioned in the YouTube video Medias portrayal of gender roles shows little girls grocery shopping and cooking like women roles should be, so why not learn early? Not to mention the Tonka Pods that are small construction toys to show little boys where they are expected to work (YouTube, 2014). Though parents might think toys are just for children to play with, those â€Å"toys† are molding them for the future. Toys such as Baby Alive or the American Girl dolls, give the perception that its okay for young ladies to have children and that its their role to take care of the child, because they are a the woman. On the a web page called women in advertisements and body image illustrate an image with a woman on the floor seeming to be looking a Christmas card. In the caption of the advertisement it states â€Å" Christmas morning she will be happier with a hoover† this statement undergoes the housewife role. Studies of advertisements in a variety of mens, womens, and general interest magazines have categorized women in various roles: housewife, decorative element, sex object, and dependent on men† (Zimmerman Dahlberg, 71). With the intention of grabbing the man or woman’s attraction to the product based on their gender roles, thus their interest. In addition, race is the  greatest influential on society. Well what exactly is race? Race is grouping of entities that believed to share joint inborn biological characteristics. To start from the beginning slave codes where set to govern slaves, black people. Once it became unconstitutional the black codes where then placed, which are regulations that only affected blacks. As stated before the recreation of systems of discrimination is repetitive. Meaning black codes where only the recreated, yet name change of slave codes. Ne xt the Jim Crow laws were assigned setting segregation status between whites and blacks. Although these laws are not placed today and are considered unconstitutional statistics show that blacks are still the underdogs. The likelihood that a black defendant with a white victim will be prosecuted is significantly more than a white defendant and a black victim. Race has physical and cultural social construction. Physical differences cause the cultural differences. For example within the African American culture there is a battle between the light skin and dark skin men and women. In the Race In Hollywood: Black Actresses Weigh In On The Light Skin Vs. Dark Skin Debate (VIDEO) successful actresses and the lovely Oprah discuses the topic of dark and lighter skin people in the same race. Oprah asked if the actresses wherever denied a part, because it was for the â€Å"prettier black girl, even from their own people† and two mentioned yes (The Huffington Post, 2014). Gabrielle Union mentioned in the video that dark and light skin girls go to clubs and promote against each other. From experience I have personality been a victim of the dark and light skin discrimination. Things like â€Å"our pretty for a dark skin girl† or even â€Å"your dark skin makeup sets well† are a few slurs African American females through at each other. As for the African American race to be the most victimized it is astonishing that there would be hatred against each other. Also, said in the Oprah interview some believe this is the aftermath of slavery that African Americans are still mad, hurt and are continuing to battle against one another because of it. Do you think â€Å"we† are becoming more equal through out history? Although, the reality is that we repeat history. Between class, gender, and race the recreation of systems of discrimination is repetitive. After showing the massive class misconception and non-mobility, gender roles, race against race, yet also against same racial group how well is our society creating a equal nation. References The Economist,. Mobility, measured, 2014. Online. Internet. 11 Nov. 2014. . Available: http://www.economist.com/news/united-states/21595437-america-no-less-socially-mobile-it-was-generation-ago-mobility-measured. The Huffington Post,. WATCH: Actresses Tackle The Light Skin Vs. Dark Skin Debate, 2014. Online. Internet. 11 Nov. 2014. . Available: http://www.huffingtonpost.com/2013/06/26/race-in-hollywood-light-dark-skin_n_3473707.html. Womeninads.weebly.com,. WOMEN IN ADVERTISEMENTS AND BODY IMAGE Overview, 2014. Online. Internet. 11 Nov. 2014. . Available: http://womeninads.weebly.com/index.html. YouTube,. Medias portrayal of gender roles, 2014. Online. Internet. 11 Nov. 2014. . Available: https://www.youtube.com/watch?v=w2bYinZ6RX0. YouTube,. Wealth Inequality In America, 2014. Online. Internet. 11 Nov. 2014. . Available: https://www.youtube.com/watch?v=JTj9AcwkaKM.

Breastfeeding: Advantages and Disadvantages

Breastfeeding: Advantages and Disadvantages This essay is potentially vast in its scope as the advantages and disadvantages of breastfeeding can vary enormously depending on which authority one chooses to consult. (1) We shall therefore take an overview and present the generally accepted arguments in this area. There is a substantial evidence base for the benefits of breastfeeding for not only the infant, but also the mother, the families and society as a whole. (2). The benefits are not only nutritional, but cover other areas such as development, immunity, psychological well-being, overall health risks, social and environmental areas (3) Human milk is widely recommended as the food of choice for the otherwise healthy full-term newborn. Apart from providing the optimal nutrition it contains a number of cellular and humoral components such as phagocytes, immunocompetant cells, immunoglobulins and hormones and also plays a (as yet, not fully defined) role in promoting intestinal mucosal maturation. (4) Because of these (and other) considerations, the World Health Organisation recommends exclusive breastfeeding for at least the first six months of life. (5) There is widespread evidence that the trend towards universal breastfeeding is increasing (viz. 6) in most of the developed countries, Fewtrell gives a global figure of 2% per year. but studies show that this trend is not equal across all socio-economic and demographic groups. If we specifically consider the UK situation then we can show that the commencement of breastfeeding is equal in the working and non-working mothers groups, although if one considers the situation of how many mothers are still breastfeeding at six months post partum, the incidence in the working mothers group is less than half that in the non-working group. (7) What then is the evidence base for the benefits of breastfeeding? In addressing this question we shall confine our comments to those relevant to the developed world. If we consider the Kramer study, which compared the benefits of continued breastfeeding from 3 months to 6 months, the authors were able to demonstrate that the additional 3 months produced benefits in terms of greater weight gain, greater growth (length) together with a reduced incidence of gastrointestinal infection. (8) In absolute terms however, the benefits of breastfeeding over formula milks (or cows milk) is much greater. A huge number of potential childhood infections have been demonstrated to have a lower incidence in the breastfed child including bacterial meningitis, diarrhoea, respiratory tract infections, otitis media, urinary tract infections (9) as well as less common entities such as necrotising enetrocolitis (10). It is also significant that the all-cause mortality rates are 21% less in breast fed infants. We should note that this figure, although accurate, is misleading, as many high risk babies are not breast fed because of their intercurrent problems. (11) Apart from infections, many other health benefits can be demonstrated. There is a reduction in the incidence in sudden infant death syndrome under the age of 1 yr. (12). Diabetes (Type I and Type II) is less common amongst breastfed babies (in later life) as are the incidences of conditions such as lymphoma, leukaemia and Hodgkin’s disease. (13). Breastfeeding tends to be associated with a lower incidence of obesity, hypercholesterolaemia and asthma. (14) There is a slightly weaker evidence base to support the benefit of breastfeeding in terms of neurological development. Some authorities suggest that it can improve cognitive development. (15) and it may also reduce the perception of some painful stimuli. (16) In addition to benefits for the child, there are also a number of demonstrable benefits for the mother who breastfeeds. If suckling occurs at the time of birth, the resultant release of oxytocin reduces the incidence of post partum haemorrhage and increases the speed of uterine involution. (17). In the period after the birth, breastfeeding reduces both fertility and menstrual loss, it facilitates a return to pre-pregnancy weight, it reduces the risk of both ovarian and breast cancer (18) and may well reduce the incidence of osteoporotic fractured hips (19) In the opening segment of this essay we alluded to the benefits to the community as a whole. These can be defined in terms or reduced health costs to the community by virtue of the protective effects of breastfeeding. There are also less definable benefits in terms of reduced employee absenteeism. Some authorities have gone as far as to point to the environmental benefits of reduction in energy expenditure on production, distribution and disposal of formula feeds and their packaging. (20) Thus far we have considered the positive benefits of breastfeeding but in order to provide a balanced argument, we should also consider the disadvantages. The pre-term infant or severely underweight or ill baby has special needs and there are a number of reasons why they should not be breastfed. The pre-term infant has immature physiological systems and the kidneys may not be able to handle the osmotic gradients that are required to excrete the amount of fluid necessary to remove the amount of nutritional load required for adequate growth. This may result in respiratory problems and exacerbation of any pre-existing cardiac conditions (viz. patent ductus arteriosus). For this reason, most pre-term infant are electively parentrally fed and then weaned onto enteral feeding when their gastrointestinal tract and other physiological systems are mature enough to handle the fluid load. (21) If the mother is ill or has a potentially communicable illness such as HIV/AIDS or TB, then breastfeeding is contraindicated, as it is in conditions when certain drugs (both medicinal and recreational) are taken by the mother. (22). We should also record that the evidence for HIV/AIDS spread is not secure, as some studies have suggested that breastfeeding actually confers a degree of protection against HIV/AIDS for the child. This is still an area of considerable debate. (23) It is also clear from an examination of the literature on the subject, that there is a great deal of misinformation on the subject of breastfeeding in the popular press (and to a lesser extent in the medical press). Breastfeeding is not contraindicated in conditions such as Hepatitis B or C +ve. (24). Most febrile conditions are not a contraindication to breastfeeding as the maternal immune response will be passively given to the child in any event. Some authorities suggest that tobacco smoking is a contraindication to breastfeeding. If we remove considerations of general health from the consideration, there is no reason why tobacco smoke should be considered a bar to breastfeeding as such. (it clearly may be ill-advised however) (25). Some authorities suggest on theoretical grounds that breastfeeding should be suspended during the period of physiological jaundice of the newborn. A number of recent studies have shown that this is not necessary and may cause insurmountable difficulties in rehabilitation-establishing breastfeeding after the event. (26) In essence, within the scope of the exclusions referred to above, healthcare professionals should actively encourage and support mothers in their ability to breastfeed their offspring. In doing so, one should always consider the autonomy of the mother (27) and attempt to provide empowerment and education in order to facilitate the best result rather than compulsion or emotional blackmail. (28). This should help to ensure the maximum possible take up of breastfeeding from mothers who have been able to make a fully informed decision. If direct breastfeeding is not possible, then, generally speaking, expressed breast milk is the preferred substitute. In this essay we do not presume to have covered anything like an exhaustive presentation of the arguments, but there is no doubt, from an overview of the evidence base on the subject, that in the vast majority of cases, both mother and child will derive substantial benefits from being able to breast feed for at least the first six months of life. References (1) Duerbeck N B (1998) Breast-feeding: what you should know so you can talk to your patients. Comp Ther 1998 ; 24 : 310 318 (2) Kramer M S, Chalmers B, Hodnett E D, et al. (2001) Promotion of Breastfeeding Intervention Trial (PROBIT): a randomized trial in the Republic of Belarus. JAMA. 2001 ; 285 : 413 – 420 (3) Schanler R J. (2001) The use of human milk for premature infants. Pediatr Clin North Am. 2001 ; 48 : 207 – 219 (4) Margolis L H and J. B. Schwartz (2000) The Relationship Between the Timing of Maternal Postpartum Hospital Discharge and Breastfeeding. J Hum Lact, May 1, 2000 ; 16 (2) : 121 128. (5) Fewtrell M S , J. B Morgan, C. Duggan, G. Gunnlaugsson, P. L Hibberd, A. Lucas, and R. E Klein man (2007) Optimal duration of exclusive breastfeeding: what is the evidence to support current recommendations? Am. J. Clinical Nutrition, February 1, 2007 ; 85 (2) : 635S 638S. (6) Bonuck K A, K. Freeman, and M. Trombley (2006) Randomized controlled trial of a prenatal and postnatal lactation consultant intervention on infant health care use. Arch Pediatr Adolesc Med, September 1, 2006 ; 160 (9) : 953 960. (7) Kramer M S, Kakuma R. (2001) The Optimal Duration of Exclusive Breastfeeding. Geneva, Switzerland: World Health Organization ; 2001 (8) Kramer M S , Guo T, Platt R W et al. (2003) Infant growth and health outcomes associated with 3 compared with 6 mo of exclusive breastfeeding. American Journal of Clinical Nutrition, Vol. 78, No. 2, 291 295, August 2003 (9) Heinig M J. (2001) Host defense benefits of breastfeeding for the infant. Effect of breastfeeding duration and exclusivity. Pediatr Clin North Am. 2001 ; 48 : 105 –123 (10) Dewey K G, Heinig M J, Nommsen-Rivers L A. (1995) Differences in morbidity between breast-fed and formula-fed infants. J Pediatr. 1995 ;126 : 696 – 702 (11) Chen A, Rogan W J. (2004) Breastfeeding and the risk of postneonatal death in the United States. Pediatrics. 2004 ;113 (5) (12) Horne R S, Parslow P M, Ferens D, Watts A M, Adamson T M. (2004) Comparison of evoked arousability in breast and formula fed infants. Arch Dis Child. 2004 ; 89 (1) : 22 –25 (13) Davis M K. (1998) Review of the evidence for an association between infant feeding and childhood cancer. Int J Cancer Suppl. 1998 ; 11 : 29 – 33 (14) Toschke A M, Vignerova J, Lhotska L, Osancova K, Koletzko B, von Kries R. (2002) Overweight and obesity in 6- to 14-year old Czech children in 1991: protective effect of breast-feeding. J Pediatr. 2002 ; 141 : 764 – 769 (15) Horwood L J, Darlow B A, Mogridge N. (2001) Breast milk feeding and cognitive ability at 7–8 years. Arch Dis Child Fetal Neonatal Ed. 2001 ; 84 : F23 – F27 (16) Carbajal R, Veerapen S, Couderc S, Jugie M, Ville Y. (2003) Analgesic effect of breast feeding in term neonates: randomized controlled trial. BMJ. 2003 ; 326 : 13 (17) Labbok M H. (2001) Effects of breastfeeding on the mother. Pediatr Clin North Am. 2001 ; 48 : 143 – 158 (18) Rosenblatt K A, Thomas D B. (1993) Lactation and the risk of epithelial ovarian cancer. WHO Collaborative Study of Neoplasia and Steroid contraceptives. Int J Epidemiol. 1993 ; 22 : 192 – 197 (19) Paton L M, Alexander J L, Nowson C A, et al. (2003) Pregnancy and lactation have no long-term deleterious effect on measures of bone mineral in healthy women: a twin study. Am J Clin Nutr. 2003 ; 77 : 707 – 714 (20) Jarosz L A. (1993) Breast-feeding versus formula: cost comparison. Hawaii Med J. 1993 ; 52 : 14 – 18 (21) Denne, S. C., Karn, C. A., Ahlrichs, J. A., Dorotheo, A. R., Wang, J. Liechty, E. A. (1996) Proteolysis and phenylalanine hydroxylation in response to parenteral nutrition in extremely premature and normal newborns. J. Clin. Invest 97 : 746 -754 (22) Read J S; (2003) American Academy of Pediatrics, Committee on Pediatric AIDS. Human milk, breastfeeding, and transmission of human immunodeficiency virus type 1 in the United States. Pediatrics. 2003 ; 112 : 1196 – 1205 (23) Coutsoudis A, Rollins N. (2003) Breast-feeding and HIV transmission: the jury is still out. J Pediatr Gastroenterol Nutr. 2003 ; 36 : 434 – 442 (24) Pickering : (2003) American Academy of Pediatrics. Transmission of infectious agents via human milk. In: Pickering LK, ed. Red Book: 2003 Report of the Committee on Infectious Diseases. 26th ed. Elk Grove Village, IL: American Academy of Pediatrics; 2003 : 118 – 121 (25) American Academy of Pediatrics, (2001) Committee on Drugs. Transfer of drugs and other chemicals into human milk. Pediatrics. 2001 ; 108 : 776 – 789 (26) American Academy of Pediatrics, (2004) Subcommittee on Hyperbilirubinemia. Management of hyperbilirubinemia in the newborn infant 35 or more weeks of gestation. Pediatrics. 2004 ; 114 : 297 – 316 (27) Sines D (1995) Impaired autonomy: the challenge of caring. Journal of Clinical Nursing 4 (2) 109 -115. (28) Marinker M.(1997) From compliance to concordance: achieving shared goals in medicine taking. BMJ 1997 ; 314 : 747 – 8. ############################################################### 12.05.07 PDG Word count 2,183 Polycrystalline Ceramics: Sub Grain Structure Polycrystalline Ceramics: Sub Grain Structure Pure un-doped zirconia is a polymorph which has three allotropes namely: Monoclinic, Tetragonal and finally Cubic. These phases tend to transform into each other when exposed to certain temperature ranges and such transformation is important for the processing and mechanical properties of zirconia. The monoclinic phase of pure un-doped zirconia is stable at room temperature and remains so up to about 11700C, where it then transforms into tetragonal phase. It becomes stable tetragonal at this temperature and remains so up to 23700C, where it turns to cubic. The cubic phase occurs up to the melting temperature of 26800C. Monoclinic phase The monoclinic form also referred to as baddeleyite, is a thermodynamically stable phase at a temperature range between room temperature and approximately 9500C. It contains four ZrO2 molecules per unit cell and has a space group of P21/c. Figure 2.1 shows the lattice parameter of monoclinic form. Its structure is described as a distorted fluorite (CaF2 structure). It is difficult to define the crystal structure of monoclinic zirconia because of its complexity as well as the problem of making a monoclinic single crystal with the satisfactory qualities due to: micro-cracking, low purity, twinning and disproportionate solid solution formation. Tetragonal phase This is a high temperature phase (t) firstly discovered by a group of scientist during its transformation from the lower temperature monoclinic phase over a temperature of about 11500C. Figure 2.1 shows the lattice parameter of tetragonal form. The structure is similar to that of monoclinic polymorph in the sense that it is also distorted CaF2 structure. Hence, tetragonal zirconia (t-ZrO2) can be described using the face centred tetragonal Bravais lattice as oppose to the body centred tetragonal lattice, that contains a unit cell with volume twice the size of the primitive cell. (3) Figure 2.2b shows a simple schematic of a tetragonal unit cell. Its structure comprises of eight oxygen ions surrounding a zirconium ion, with half at a distance of 0.2455nm forming an elongated tetrahedron and the remaining four are at a distance of 0.2065 forming a flattened tetrahedron (the elongated and flattened tetrahedron are rotated 900 to each other). The transformation from tetragonal to monocli nic can start (Ts) and finish (Ts) over a range of temperatures. This reaction can be measured using the following experimental techniques: DTA, XRD and dilatometry. (3) Cubic phase Unlike the other structures, the cubic polymorph is quite easy to explain as it has a fluorite structure (CaF2). Figure 2.2c shows a simple schematic of a tetragonal unit cell. It has a lattice parameter of the order 0.508nm (this however depends on the temperature purity of zirconia that is partially stabilised zirconia at room temperature or pure zirconia at elevated temperature) and a crystal symmetry of Fm3m.   The martensitic transformation For a martensitic transformation to occur, a change in shape is required which must also produce a plane that does not change during transformation. This is so that it is common to the phase produced as well as the parent phase. The phase transformation in zirconia involves a change in volume of between 4 to 5%. The matrix inhibits the transformed particle of zirconia causing a partial shape change. However, the transformation creates a strain which is held in the monoclinic and its surrounding grains. As a result of this, researchers have come up with the idea that transformation stresses are relieved by deformation twinning. When this happens, most of the lattice strain is then restricted to the monoclinic/matrix interface. Micro-cracks can be formed at this matrix/monolithic interface or in the monoclinic particle if this lattice strain increases. The twinning found in monoclinic is caused by deformation twinning, as the researchers have observed using TEM that a section of the st rain related with the transformation happens as a result of a mechanism known as slip. (3) The phase transformation particularly from tetragonal to monoclinic is of great importance, as it attributes the zirconias excellent properties. [from fulltext.pdf] It was firstly discovered by Garvie et al that the transformation of metastable tetragonal phase to monoclinic phase acts as a toughnening mechanism to crack propagation resistance in zirconia. The transformation is quick and results in a 4 to 5 percent increase in volume which leads to formation of micro-cracks and eventually macro-cracks in the material. This process induces compressive stresses and thus toughens the materials. Gupta et al backed this theory up. Studies showed that the transformation mechanism is highly dependent on grain size and by doping the ceramic material with stabilisers. Examples of stabilisers are yttria (Y2O3), magnesia (MgO), calcia (CaO), etc. Y-TZP ceramics is in the family of these toughened materials. Tetragonal zirconia doped with Yttria (Y-TZP) has great strength of over 1000MPa and tou ghness weighing between 6 and 10 MPa.m1/2. This makes it an ideal contender in medical applications, particularly in hip joints. ZrO2 Y2O3 The phase diagram shown in figure 3 was firstly discovered by Scott (1975), this study was agreed and used by many more researchers. The tetragonal phase field is the main aspect of figure 3. It shows that up to about 2.5mol% of Yttria can be produced in solid solution in addition with the low eutectoid temperature leading to the formation of a fully tetragonal ceramic, this will happen as long as the grain is of an appropriate size. The theory of transformation toughening produced some excitement in the materials industry however this excitement came to a halt when Kobayashi et al discovered a flaw in Y-TZP ceramics. Y-TZPs undergoes low temperature degradation during ageing at temperatures ranging from 100 to 4000C, this is particularly enhanced when it is exposed to water or is in humid environments. This degradation is due to the formation of flaws such as micro-cracks and macro-cracks (mentioned earlier) at the surface which gradually goes into the bulk of the material. These flaws are due to the spontaneous transformation from tetragonal phase to monoclinic phase. Material scientists have documented literature regarding the degradation however there have been contradictory views as to the mechanism of this phenomenon. Figure 4 is a graphshowing the low temperature degradation of different types of TZPs. Figure 5 shows ageing temperature against surface monoclinic levels. Some of these researchers focused on the interaction between water (or water vapour) and YTZP, whilst others focused on ways to prevent this from happened. Sato et al came up with a theory where the hydroxyl group from water (H2O) reacts with zirconia from the bonds between zirconia and oxygen (that is Zr-O-Zr bonds) forming Zr-OH bonds at crack tips. This accelerates the rate at which the metastable tetragonal phase transforms to monoclinic at low temperatures. They came up with the conclusion that there is a strain which stabilizes the tetragonal phase, however under certain circumstances it is released and with the combination other pre existing flaws accelerates the transformation. The theory put forward by Yoshimura et al is similar to that of Sato et al in the sense that the Zr-OH bonds are also formed. However, the reaction process which leads to the same outcome is what differentiates the two theories. Their research showed a comparison of the transformed monoclinic phase to the untransformed tetragonal ZrO2. Hydroxyl (OH-) was in the monoclinic ZrO2 whereas there was no trace in the latter. Due to their findings, they came up with the theory that the degradation process occurred in stages: upon exposure to water, Zr-OH bonds are formed as a result of H2O being adsorbed on the YTZP surface. This creates a stress site which builds up as the OH- ions diffuse through the surface and lattice causing the formation of nucleation sites for the phase transformation. This occurs until the stress reaches crack level causing the transformation to occur at the surface leading to the formation of micro and macro cracks all the way through to the bulk. Lange et al [7] witnessed ÃŽÂ ±-Y(OH)3 crystallites of about 20 50 nm in size forming and came up with the idea that the hydroxide formed creates a monoclinic nuclei by removing Yttria from the grains of the tetragonal phase on the surface. As Yttria is being withdrawn, growth of the nuclei continues until a critical size where it will grow spontaneuously, leading to the transformation of tetragonal grains to monoclinic. Micro cracks and macro-cracks begin to occur as the transformed grain gets large enough. This process happens over and over again as the micro and macro-cracks act as a site for water molecules to penetrate into to the grains. This process occurs only if the grains are larger than the critical size. However, if they are smaller, the transformation will be influenced by the diffusion of Yttria on the surface. Other researchers such as Winnubst and Burggraf support this theory, as they found traces of Yttria on surface layer of the YTZP specimen. Their specimen was exposed to temperature of 1770C in a nitrogen environment for over 5hrs and using an auger electron microscope, they found a yttrium rich surface layer. The listed theories were based on YTZPs mechanism during degradation. Whalen et al identified that the reason for this degradation is the spontaneous transformation from tetragonal phase to monoclinic phase at the surface which then eventually spreads to the bulk. They came up with the idea of stabilising the tetragonal phase. This could be done by either of the following two methods: the chemical factor which is increasing the stabiliser content on the surface or the microstructural solution which is reducing the grain size at the surface. The latter was decided upon and this was done by the process of post sintering grinding followed by annealing treatment. 2.45mol% Y2O3/ZrO2 was the material involved in the research. Samples of the material were made using isostatic pressing at pressure of 275MPa and then sintered at a temperature of 15000C for a time period of 2hrs. A 2mm disk was formed of which its two sides had different surfaces treatments, One side being polished and the other being surface grounded. The phase compositions at surfaces were then examined using XRD. The XRD result indicated there was a significant difference in the phase composition of both sides. The ground side showed little transformation change whereas there was 50% increase in monoclinic phase after annealing. This provided evidence that the ground and annealed surface hindered the process of phase transformation from tetragonal to monoclinic at the surface. As a result of this, there were no micro-cracks formed at the surface and hence the expected mechanical properties were achieved. Talk and compare it to mine later (TEM as oppose to XRD, advantages of process) The aim of this project is to provide evidence (if any) of the occurrence of refined grains (recrystallization) in Y-TZP structures as a result of deformation. The ideology used to explain the concept of recrystallization in metals can be used to explain its occurrence in ceramics as this is a new phenomena in the ceramic industry. Grain refinement requires certain conditions in its exposure in polycrystalline ceramics and they are: plastically deforming the material (as a result of applying a stress) and followed by heat treatment. Deformation is basically a change in body shape which occurs as a result of an applied force. Materials may experience either elastic which is impermanent deformation that upon the release of an applied stress is recovered or plastic deformation which is permanent deformation that is non recoverable when a stress is applied. YTZPs recrystallization behaviour can be explained by its ability to plastically deform. The stress and strain behaviour of a material is used to determine the start and the degree of plastic deformation. Figure 6 shows an example of a typical stress and strain curve. Yield tensile strength is the point at which elastic deformation ends and the material begins to plastically deformation. Most polymers and metals undergo elastic followed by plastic deformation but this is not the case for ceramics. They undergo elastic deformation followed by fracture with little or no plastic deformation. YTZP has superplasticity properties and this nature can be used to explain refinement in its microstructure. Plastic deformation is governed by the movement of large numbers of dislocations. Hindering dislocation motion will increase a materials strength. Ceramics are inorganic materials held together by both ionic and covalent bonds. The bonding combination results in hindering the motion of dislocations, hence their high strength but brittle behaviour. Dislocation is an important factor in understanding plastic deformation and so certain elements need to be examined in order to understand the concept. Most materials comprise of an arrangement of atoms referred to as a crystal structure (these can either be single or polycrystalline that is having multiple crystals as the name suggests). This project will focus on polycrystalline zirconia, however understanding single crystals help in explaining the behaviour of polycrystalline materials. All crystal structures have flaws that distort the regular arrangement of the atoms. These flaws can either be point defect (that is they may have vacancies or interstitials), surface, line (dislocations) and volume defects. The activities and effects of all these flaws are interconnected thus the importance in the need to understand them. As the dislocations move, they tend to interact with one another however this interaction is a complex as an amount of dislocations (rephrased from pdf). The collective motion of dislocations leads to gross plastic deformation. http://composite.about.com/library/PR/2001/blmpi1.htm Dislocations can either be screw, edge or a hybrid of both. Edge dislocation: in this dislocation, the line of defect is parallel to the shear stress. The dislocation movement is similar to that of a caterpillar in the sense that the motion is in small amounts at a time. Figure 7shows a typical schematic of the motion of dislocations. A is the extra half plane of atoms. As shear stress is applied, the bond between the upper and lower part of B is broken. The extra atom plane of atom A bonds with the lower part of B converting the lower part to an extra half plane. This motion causes the top half to move with respect to the bottom half. Screw dislocation: this is similar to that of edge in the sense that it also occurs with shear stress however, the defect line is perpendicular to the shear stress as oppose to being parallel. Just like the edge dislocation only a minute fraction of bonds are broken at a given time. Although the motions are different, the overall plastic deformation for both dislocations is the same. The primary mechanism that causes plastic deformation in crystals is called slip. As dislocations move across the crystals, they shear the crystals along their planes of motion. Slip System The degree of ease of motion of dislocations is different with in all crystallographic directions and crystallographic planes of atoms. Normally dislocation motion occurs in a preferred plane and within that plane there are specific directions at also which it occurs. The combination of the plane and direction is referred to as a slip system. The plane at which this motion occurs is referred to as slip plane, and the direction is referred to as slip direction. The slip system depends on the crystal structure of the material. Slip will only occur when the value of applied the shear stress exceeds a certain critical value. The mechanism at which slip occurs is different in single crystals that of polycrystalline materials. Schmid defined the critical shear stress in single crystals as shown in figure 9: Deformation is much more complicated in polycrystalline materials as the crystallography orientations of numerous grains have to be taken into account. This orientation is random and therefore causes the direction of slip to vary from one grain to another. Its complexity extends further more to the grain boundaries which acts as barriers to dislocation motion. Twinning is another mechanism at which plastic deformation can occur. The idea of twinning in plastic deformation is to allow further slip to occur by producing changes in plane orientations. It occurs when a fraction of the crystals adopts an orientation that is correlated to the orientation of the rest of the untwined lattice in an exact proportioned way. Figure 10 shows an illustration of an un-deformed crystal with one undergoing slip and twinning. There is a clear difference between slip and twinning. The crystal orientation in a slip is the same above and below the slip plane whereas in twinning differs across the twin plane. More differences is illustrated in figure 11 Slip Twinning Where it occurs Widely spread planes Every plane of region is involved Occurrence On many multiple slip systems simultaneously On a particular plane for each crystal Time required Milli seconds Micro seconds Size (in terms of inter atomic distance) Multiples Fractions. ANNEALING PROCESS LEADING TO RECOVERY, RECRYSTALLIZATION AND GRAIN GROWTH Annealing is a high temperature process that causes changes in a materials structure, leading to alterations in its properties. When a material is plastically deformed, majority of the energy is dissipated as heat, but a minute fraction is stored in the material as strain energy which is associated with a range of lattice imperfections established as a result of deformation. The deformation process as well as a number of various factors (such as temperature and rate of deformation) determines the amount of energy stored in the material. A reduction in deformation and an increase in intensity of deformation cause a vast increase in the amount of retained energy. The release of stored energy There are two main techniques of releasing the energy retained by a material due to plastic deformation and they are an-isothermal annealing and isothermal annealing. Anisothermal annealing occurs when the material is continuously heated from a lower temperature to that of a higher one (the energy discharged is determined as a function of temperature) whereas, Isothermal annealing occurs when the temperature is constant. The materials microstructure will undergo either or maybe all of these three restoration processes: recovery, recrystallization and grain growth. The extent of plastic deformation can sometimes determine the mechanisms of recovery and recrystallization. These processes require heat treatment to cause rearrangement of grain boundaries and dislocations. Recovery It is the initial stage of annealing that takes place at the low temperature stage of annealing. As a material is plastically deformed, a minute portion of mechanical energy is stored which exists in crystals as stacking faults, point defects (such defects are interstitials and vacancies) and dislocations. When a material is plastically deformed, it is at a thermodynamically unstable state of higher energy. This is converted to lower energy states by the application of annealing leading to a change in microstructure. There are two process involved in recovery: slip annihilating and polygonization. Slip annihilation occurs when dislocations of opposite signs (that is in the case of edge dislocations, the fusion of the positive and the negative edge dislocation or in the case of screw in which the right hand screw merges with the left hand screw) merge together thereby cancelling each other out. Polygonization is the rearrangement of dislocation after annihilation recovery to a lower energy configuration. During recovery, this strain energy built up is relieved to some extent by dislocation motion, due to enhanced atomic diffusion at high temperatures. Recovery leads to physical properties like thermal and electrical conductivities being recovered to their pre worked states. [ggbk] Recrystallization After recovery, grains are not entirely strain free. That is the energy state of the grains is relatively high. New sets of strain free grains having near equal dimensions in all directions with low dislocation densities are formed. This process is known as recrystallization. This mechanism of producing new equaxed grains is driven by the difference in internal energy between the unstrained and strained material. The process of recrystallization can occur after or during deformation. The manner at which recrystallization occurs is of two kinds which vary with materials. Firstly a continuous manner, at which the microstructure gradually evolves into a recrystallized one or a discontinuous manner at which distinct new grains nucleate and grow Recrystallization after deformation is referred to as static whereas the latter is known as dynamic. The extent at which recrystallization occurs is dependent on two factors namely: time and recrystallization temperature. The temperature at which recrystallization is completed in an hour is referred to as recrystallization temperature. It is usually a third to half the materials melting temperature. The rate at which recovery process occurs is inversely proportional to time (that is it reduces with increasing time). Recrystallization has an entirely different kinetic. During the isothermal annealing, recrystallization starts very slowly then builds up gradually up to a certain point where it slows down. This can be shown in figure 13 In some cases it can be as high 0.7th the melting temperature. An illustration of the relationship between recrystallization temperature and percentage cold work is shown in figure 14. It is understood that as the percentage cold work increases, the recrystallization temperature decreases. Other factors affect the rate and occurrence of recrystallization. The annealing temperature is one of a few factors that have an effect on recrystallization. A materials recrystallization temperature reduces annealing time. The stress applied is another factor both recrystallization and temperature, an increase in stress applied means a lower temperature is required to activate the process. Also, the deformation on the material must be enough to allow nucleation and growth. A process known as grain growth occurs in a polycrystalline material after recrystallization provided the annealing temperature is maintained. The restoration mechanism does not require prior deformation or recrystallization and therefore will occur during annealing in their absence in a polycrystalline material. Grain boundary is the driving force for recovery. Stored energy produced as a result of a material being plastically deformed is released during the process of annealing causing a change in microstructure. This energy released is as a result of various mechanisms due to crystal defect interactions: A decrease in crystal defects due to their reactions with each other. Dislocations with opposite signs interacting causing their annihilation and dislocation loop shrinkage. Relocation of dislocations causing the formation of lower energy configurations such as grain boundaries with low angles. The formation of grain boundaries with high angles. These reactions occur during the restoration process of recovery. After this process, the following can occur: Dislocations as well as point defects being absorbed as a result of the migration of high angle grain boundaries. A decrease in the overall grain boundary area. These micro-structural changes occur during the restoration process of recrystallization and recovery. As a result of these micro-structural modifications, an ideal definition of recrystallization is derived: Along with the micro-structural changes, the properties of the specimen also change correspondingly. Thus, deformation and annealing are important processing methods for producing desired properties of the material by controlling its microstructures. Recrystallization mechanism The start of recrystallization is referred to as nucleation and occurs when dislocations are rearranged so as to form low dislocation density sections that have a high angle grain boundary with great mobility and thus is capable of quick movement over the strained region or recovered matrix. Recrystallization has a low driving force and high grain boundary energies; as a result of these characteristics, thermal variations cannot explain regions surrounded by high angle grain boundaries that are free from defects upon annealing. Therefore, the formation of recrystallized grains does not occur during annealing but previously exists in the deformed state. Three methods can be used to describe nucleation and they are: Movement of high angle boundaries that already exist before annealing: this happens when pre existing grain boundaries move into grains that are highly strained as illustrated in figure 16 this process requires a favourable energy balance between an increase in the overall grain boundary surface and a reduction in stored energy as a result of the removal defects triggered by the migration of the boundary. Movement of sub boundaries (that is low angle boundaries): this model is based on the theory of polygonization where stored energy is reduced during annealing as a result of rearrangement and removal of defects. It occurs when sub grain boundaries besiege regions containing low dislocation densities. Upon formation of sub grains, with the help of sub grain boundary movement, they are able to grow at the expense their neighbouring grains. Dislocations are absorbed by migrating sub boundaries and because of this, their mobility, orientation differences and energies are increased until their transformation into high angle boundaries, thus illustrating nucleation. Sub grains coalescence: this occurs when two neighbouring subgrains merge leading to their crystal lattices coinciding. It is regarded as a slow process but when compared to migration of sub grains is favoured for annealing at low temperatures. it is illustrated in figure 17. In this method, stored energy is reduced leading sub boundaries disappearing, sub grains growing and increase in orientation differences between coalescence groups and their neighbouring sub grains. These lead to the formation of high angle boundaries which move at high speeds and cause the process of recrystallization nucleation. It is vital to identify the fact that the total energy balance that takes the disappearance of sub boundaries into account with the increase and orientation difference is favourable (that is it leads to a reduction in total free energy). This mechanism is illustrated in figure 18. The occurrence of these three models is relatively diverse and they will therefore occur under different conditions. The basic requirement for the occurrence of the movement of pre existing grain boundaries that is the existence of differences in large strain between neighbouring grains is well accepted by researchers. However, there is conflict as to when the mechanisms sub grain boundaries migration and the coalescence of sub grains occur. Researchers believed the coalescence of sub grain boundaries are linked with large dispersion of sub grain angles distribution, relatively moderate strain, and reasonably low annealing temperatures. Whereas the mechanism of sub grain migration is linked with high annealing temperatures, strains that are relatively high and large dispersion in the distribution in sub grain size. Growth of recrystallized regions The basic mechanism causing recrystallization and grain growth is the migration of grain boundaries with high angles. However their driving force is what differentiates them from each other. The energy of the high angled grain boundaries is the main driving force for grain growth whether it being abnormal or normal growth. Whereas that for recrystallization is the energy stored during straining appeared as crystalline defects. In defect free regions that are encircled by boundaries with high angle, recrystallization progresses by enlargement of this nucleus over the non recrystallized medium. Grain growth and recrystallizations migrating high angle boundary curvature signal is another important factor that differentiates the two. http://asmcommunity.asminternational.org/portal/site/www/AsmStore/ProductDetails/?vgnextoid=a75a7dcbe4e18110VgnVCM100000701e010aRCRD ASM Handbook Volume 14A, Metalworking: Bulk Forming (ASM International) http://www.accuratus.com/zirc.html http://www.totaljoints.info/ceramic_for_total_hips.htm#2 http://www.azom.com/details.asp?ArticleID=940 http://books.google.co.uk/books?id=eUZw4SgqaPYCpg=PA126lpg=PA126dq=phase+transformation+mechanism+leading+to+microcracks+zirconiasource=blots=fCFhf-satfsig=WNiOjbUtX06mA_d1NkXIEEHcOsshl=enei=r568S9zCKJHFsgaxkd3lCQsa=Xoi=book_resultct=resultresnum=4ved=0CBYQ6AEwAzgK#v=onepageqf=false EXPERIMENTAL PROCEDURE Equipment Three samples of YTZP, 0ne made from 3mol Y2O3/ZrO2 powder and the other two made from the same powder but by two other manufacturers. Focused Ion Beam (FIB): is a technique used by material scientists in the analysis of a materials microstructure. the samples obtained can either be analysed directly using the FIB or transferred and viewed under a TEM or SEM. This process is similar to that of an SEM however ions (particularly gallium ions) rather than electrons. Figures 19a and b show how the FIB operates. The surface of the sample being tested is subjected to primary gallium ion beams. This spits a small part of the material, leading to the formation of either secondary ions (either positive or negative) or neutral atoms on the surface. Secondary electrons (e) are also produced from the gallium beam. This is collected as well as the signal from the split ions to form an image which is either analyzed using the FIB itself, SEM or TEM. http://www.fibics.com/fib/tutorials/introduction-focused-ion-beam-systems/4/ images is from here. GNU image manipulation program (GIMP): is an image editing software used to measure grain sizes. Vickers indentation: is used to form indentations which are viewed and studied under an optical microscope. A square imprint is formed from the Vickers indenter, where the two diagonal lengths are measured. In this project, the Vickers indentation is used to form plastic deformation. The surface defects such as scratches and unevenness need to be controlled, hence the reason for polishing. High temperature furnace: used for sintering and annealing. TEM Cold isostatic pressing Sample preparation Three mol% Y2O3/ZrO2 solid solution powder was used in this experiment. The powder was pressed into a disc at 200MPa, then sintered at 14500C for 2 hours. Two discs were produced, each pressed with loads 7.5 tons and 5 tons respectively. The load was reduced to 5 inorder to reduce the chance of lamination, as it occurred with the 7.5. Measurements and dimensions Sample 1: broken Sample 2 Weight 25.7711g 19.6836g Diameter 39.23 39.11 Height (thickness) 7.1 6.51 Dimensions after sintering<