Christian Dior Essay

The House of Dior – A fashion house that over six decades is still going strong. From a humble beginning to a power house of fashion, this house of fashion has begun a â€Å"New Look† for their market during the start if it’s business and beyond. With avant-garde designs, Christian Dior has changed women’s fashion in his era. Starting a fashion business is no mean feat. One may need all the preparation and planning in order to be successful and have your creations reach the market. The House of Christian Dior Christian Dior, a Frenchman, started his career in the 1930’s by selling his sketches to numerous prospective clients. Soon his market was in love with his sketches and designs and that deemed his creations as a â€Å"New Look†. With such creations, Christian Dior needed financial support that was when he got Marcel Boussac (a textile manufacture) to back him up to open his own house of fashion. Boussac was able to persuade Christian Dior to have him set up his place along a trendy Paris street, which Boussac was readily able to fund Christian Dior’s endeavours. With such financial support, Christian Dior began to produce creations that were considered avant-garde at that time and he was able to freely create and design whatever he had come up with without any financial difficulty (Bawa, 2002). Christian Dior knew what he wanted in life and that was to be a part of the arts. He loved to draw and sketch and to create masterpieces. This has made him successful; he knew what he wanted to do. For an aspiring entrepreneur, one must know that before they start their own clothing line or fashion business they need to know that this is what they really want to. If not, the outcome would be less successful or become a failure (Amed, 2007). Christian Dior had financial support that one can dream of. For an entrepreneur, they need to have financial stability, business partners, and the like to easily start their business. Without this, it would be a tough challenge to get by to launch a business or even try to start one. When it comes to materials, Christian Dior did not have any problems in having a short supply of that. He had his business partner to thank for and this gave him an advantage to turn his creations into reality (Charleston, 2004). One must take note that during his time it was during the Second World War that textiles were rationed. He took the initiative to have women, not only in Paris, but throughout the whole world to have them feel more feminine. He had that idea and turned it into a reality. Even if his designs and creations were well received by his peers and prospective clients, there were numerous detractors that openly disliked his attitude. They deemed Christian Dior as extravagant due to his designs using fabric up to eighty yards long. One must see that Christian Dior clearly didn’t have a market due to the hardships that the whole world was currently going through. What he did was he created one. It wasn’t merely being in the right time and at the right place, he saw the need that women wanted during his time, and he began to create the solution to that even at the cost of being deemed extravagant and being boycotted by powerful governments of state. Still he persevered and went on with his plan to change the world fashion market. With Christian Dior’s untimely death in 1957, the house of Dior was stopped suddenly in their tracks, but Dior did not leave his house open for attack, he had two competent men under him that can drive his fashion house beyond. Yves St. Lauren stepped in and headed the House of Dior into success with his designs. The house of Dior had numerous changes in the artistic development and currently has John Galiano. Starting a fashion business needs the entrepreneur to be at least five or ten steps ahead and having a fresh outlook and flow of ideas that they want to put into their market. They need to also know the latest trends and fads that the current market has in order to supply what the client wants. Not only having those ideas one must have a very good business plan in order to plan and execute strategies, decisions, and plans of actions when situations arises, especially those that are out of the box scenarios. The bottom line is that one must have passion for what they believe in. They need to believe in what they do is the right thing to do. Without these, starting up a business or even just planning for it would make all attempts useless and unfruitful. References: Amed, I. (2007). The Business of Fashion: Basics 1 – Setting up your own fashion business – what do I need to know first? Retrieved on March 9, 2008, from http://uberkid. typepad. com/fashionbusiness/2007/02/the_business_of_2. html Bawa, M. P. (2002). Christian Dior. History of Fashion. Retrieved on March 9, 2008, from http://www. historyofashion. com/historyofashion/dior. html Charleston, B. D. (2004). Based on original work by Harold Koda. â€Å"Christian Dior (1905 1957)†. In Timeline of Art History. Retrieved on March 9, 2008, from http://www. metmuseum. org/toah/hd/dior/hd_dior. htm

Political Decentralization and the Local Government System

The final tier of elected government is the district (Gila) council. The district council insisted of all the (directly elected) union council Nazism in the district. The head of district council, the district Nazism and district naif-Nazism are indirectly elected. Another aspect of representation in Devolution Plan is the creation of Citizen Community Boards (CBS) in both rural and urban areas. The CBS were expected to initiate and manage their own development projects, with 25 percent of the district development funds set aside for their use.They are Voluntary organizations' formed by citizens themselves. Source: (Schema, Jaws, & Qatar, 2005) 3. 3 Characteristics of Current Local Government System . Restructuring of Government Pakistan. † (Abaft & Hussy, 2010). Schema, 2005 discussed that the elected government and provincial administration have been integrated at the district and Thesis levels, the division abolished altogether and the local level provincial administration h as been made accountable to elected officials at the local level.Moreover, majority of public services that were previously under the provincial government have been transferred to local government increasing their scope and responsibilities. B. Provincial to Local Decentralization with No Federal Decentralization The other side of he picture is, all the authority and power which have been distributed in local governments came from provincial government, no power transferred from federal government to either provincial or local governments. C.Integration of Rural and Urban In pre-devolution period, there was a sharp distinction between rural and urban governments. But in post-devolution, it is no longer there as the administrative unit is union council which includes several towns and villages. D. Electoral Process Prior to devolution, members of urban local councils and district councils were directly elected and then they elected their heads of respective councils. Under the devol ution, both the members and heads of the lowest level of government, the union council, are elected through public vote as before.But the new legislation has created inter-governmental linkages by ensuring that the majority (two-thirds) of the members of the Thesis and district councils are these elected heads. However, within the devolved departments, â€Å"not all functions were devolved and certain activities remain within the provincial purvey. † (Schema, Jaws, & Qatar, 2005). A closer look at these changes and differences has been provided below. 3. 4 Changes under Political Decentralization Schema (2005) discussed in detail the changes brought in by devolution of power plan.These are the changes in level of decision making, administration, accountability and fiscal resources available. While this paper only covers changes in level of decision making and accountability of representative governments as focusing on political decentralization. A. Change in Decision Making L evel Before devolution, provincial government was more powerful and took all the decisions. But devolution plan distributed this power of decision making among local elected governments. For example, a service may have been under purvey of rabbinical elected government but after devolution it is transferred to local elected government.One thing to be noted is that this involves change in level of decision level of decision making power can be different depending upon the scale of service. Schema (2005) described the level changes in many different categories as under: a. Province to province b. Province to district c. Province to Thesis/Town d. Urban/ Rural Local Council to Thesis e. Urban/ Rural Local Council to District b. Change in Accountability Devolution also changed the decision maker's accountability keeping the decision making power on the same level.These are the changes where decision of a particular service is now made by the agent who differs in his accountability to pu blic. Prior to devolution, provincial bureaucracy was accountable to their non- elected provincial secretariat, while under the new system they are accountable to the elected heads of district and Thesis governments. For example, decision of some service might be taken at district level by bureaucrats before devolution, while decision are still made on the district level but by the elected district representative. So accountability of that service is now closer to the voters who elected their preventatives.The most significant accountability change is that the De facto head of district administration under the previous system, the deputy commissioner (DC), used to report to the non-elected provincial bureaucracy, whereas in the present system the head of the district administration, the District Coordination Officer (DOC) reports to the elected district Nazism. Schema 2005 summarized the discussion stating â€Å"the ultimate decision maker changed from a provincial government distr ict officer who reported to the provincial bureaucracy, to an elected Nazism who ultimately is answerable to his district's constituents. 3. 5 Analysis Critics on Current Local Government System and POLO 2001 Devolution plan is a revolutionary step in the history of decentralization in Pakistan but the structure of system of representation created a number of problems also (Abaft & Hussy, 2010). Direct election in a particular constituency limited the attention of union Nazism to union specific development schemes and they did not pay attention to their role as Thesis and District council members.This resulted in holistic and fragmented union council level projects rather than district or Thesis bevel. The structure of the electoral system also caused reverse campaigning; instead of directly elected union councilors campaigning for elections, there are cases of union Nazism campaigning for their respective union councilors. This secures the future re-election of union Nazism if the union councilor of his choice gets elected as Nazism are to be selected later indirectly (Hessian, 2008).Since political parties had been bypassed and caste-based candidates were now pitted against each other, the elections reinforced traditional hostilities at the local level. To a large extent, â€Å"such a yester of patronage and hostility defeated the opportunities for rural areas to participate in decision making and to demand better services from the state† (Abaft & Hussy, 2010). Another major problem with the system of representation that was promulgated through the Devolution plan was the lack of checks and balances between and across elected bodies.The accountability of district Nazism is almost council headed by naif-Nazism rarely goes counter to Nazism. The most important issue facing elected bodies was the clash of interests with representative provincial governments. The Devolution plan of 2000 had been prepared without consultation with stakeholders particularly provinces, at the time national and provincial assemblies had been dissolved. When these assemblies were revived, local tier had been added according to devolution plan.On that time there was no political ownership of newly created local governments which led provincial governments to interfere in both policy making and implementation at the district level (Abaft & Hussy, 2010). Citizen Community Boards (CBS) were a great way for the representation in local government, but they became functional to a certain degree, to quite in the way envisioned in the Devolution plan. Usually â€Å"CBS have become splinter groups lobbying for small investment projects and often captured by local elites or contractors looking for project funding† (Abaft & Hussy, 2010) 4.To characterize decentralization in the country â€Å"all these components (political, fiscal and administrative) must complement each other to produce more responsive local governments that will deliver effective, efficien t and sustainable services and maintain fiscal discipline† (Never, 2001). Never provided a set of questions for each component of decentralization in order to assess the level of decentralization. Considering the scope to this paper only political decentralization is being assessed in context of Pakistan using the indicators given by Never.With the descriptive answers, every situation has been given marks out of 10 ('10' is best/strong yes while ‘O' is worst/strong No) in relevance to the description. 1 . Are governments elected? Yes generally governments are elected as long as military take over and dissolved in the ill situation of law and order and bad governance. 10) 2. Are there multi-party elections? Yes elections are multi-party; there are a number of small medium and large, old and new political parties which participate in general elections. (10) 3. Are ballots cast secretly in government elections?According to constitution, ballots are and should be cast secret ly in all the areas. Exception prevails at some electoral stations which are under a high influence of some political parties but such areas are very few in number. (08) 4. Are elections held at regular intervals? 2008-13 is the first time in history of Pakistan when elected National government employed its 5-years tenure and elections were held after exact five years that is in May 2013. Before this, military has been taking over in the situation of bad governance and ill law and order. (03) 5.Are elections free and fair? There has been a big question mark on the fairness of elections as there are a few old political parties which have been controlling the country politics for a long time. Moreover, every party has its area of influence in which it can use its power and influence people and sometimes elections also. (05) 6. Is the head of local government elected directly, indirectly or appointed? According to electoral process defined by the Devolution plan which has been discusse d earlier, head of local at keeping a check on local corruption?In real practice, civil society has no power to keep check and balance on local elected representatives. They are Just elected locally but they are not in control of or accountable to the general public as envisioned in the Devolution Plan. (00) 5. The Devolution of Power Plan which has been promulgated through Local Government Ordinance 2001 is a revolutionary step in the history of decentralization in Pakistan. Mustard introduced a number of reforms which helped in reducing the AP between state and civil society.All the powers distributed to the newly created lower tiers came through provincial government without distributing the powers of federal government. Provincial governments which used to be very powerful tier become less authoritative as local tiers were directly connected with the center. Initially local governments were given constitutional protection of six years against any kind of amendments but later som e political powers, which got affected by the direct linkage of local government with center, made amendments to recover some of the lost powers.The reverse campaigning because of structure of government affects fairness of electoral process as Nazism campaigns for their own union councilors to secure their future elections rather than union councilors campaigning for the elections. This promotes sense of self benefits among the union councilors and the interests of community are ignored. Though the Devolution plan transferred powers to local tiers and empowered local communities at very bottom level but still there are some issues which hinder the efficiency of plan and limited the benefits to the citizens of Pakistan.The assessment of political decentralization in Pakistan on the basis of Never indicators shows that political system is well decentralized at least on the policy documents but in real practice issues of transparency and accountability exist. There are still some gaps in the real practice as civil society is still lacking the actual power to keep checks and balances on the representatives. 6. RECOMMENDATIONS All the powers and authority distributed at local level has been taken from province while center keeps all the authority and decision making power as it is including sisal authorities.There should be distribution of powers of center as well in order to develop a balance between center-province and province-district relation. In real practice, plan has not work up to the mark because of absence of transparency in the system particularly in financial matters. There should be complete transparent system which allows common public to look into the country's on-going matters. Voters should have power to keep check and balance on the decisions made by their representatives as they are the one who elected them through electoral process.

Assessment Philosophy Essay

In my opinion, assessment is what teachers do in order to better understand where their students are on the cognitive learning level of a subject matter. Assessment is a continuous process that takes time and understanding. As a teacher I will constantly assess my students by getting feedback from them in class. I feel that it is important for me to do this as a teacher, so I know which students need more attention on certain areas of the subject. By assessing my students, I will gain knowledge on how to use types of differentiated instruction where necessary. I believe assessment is a tool used to evaluate both the teaching and learning of  content of the student. A variety of assessment tools should be utilized to effectively reach students strengths. I realize that children learn differently and at their own pace. The types of assessment I will use to determine if my students have gotten where I want them to go will vary. Samples of my formative assessment tools I would use in the classroom would include informal and formal questioning, oral presentations, peer evaluations, variety of projects, quizzes, test, demonstrations, drawings, and web quest observations. We all have strengths and weaknesses and we all have different means of  demonstrating each. If I use a lot of assessments, and vary the types I use, it gives my students the best opportunity to show me what they have. I will allow students the opportunity to pick from various projects that will enhance their learning ability, so I can see what they are able to accomplish. As a teacher I will need to use assessments in my classroom to determine how to act upon the assessment to improve the students’ learning. I think assessments are an important part of being a successful teacher and I hope to encourage my students and show that I care about each one of them.

Nature vs. nurture Essay Example | Topics and Well Written Essays - 1500 words

Nature vs. nurture - Essay Example Much is random and therefore isn't really "behavior": a flagellating protozoa isn't "looking for" food. When social scientists explain human behaviour they imply purposeful and consequential activities. It is understood that humans are aware of their own acts and those of others. In other words, human behaviours are acquired rather than natural. Instincts, which are activities that are made without learning, altered as adaptations to exact circumstances. But success in adaptation comes at a cost: instincts make organisms "puppets" of their surroundings. Anticipating a rain a frog croaks, just as the rooster crows with the beginning of dawn. Neither the frog nor the rooster had any choice in the matter; their behaviours were simply determined by the environment. Humans have the smallest number of instincts; as an alternative, we have contradictory genetic abilities and capacities to react our environment. For us, consequently, surroundings remain a strong determinant of behaviours. Social scientists are ever more realizing the discourse of the interactions that take place between nature and nurture. The existence of genes does not by itself make sure that a particular feature will be obvious. Genes need the proper upbringing for inborn propensities to be entirely expressed. These "proper surroundings" contain not only natural environment but also of individuals' common and symbolic milieus.According to Richard Dawkins, the final purpose of the game of life is the immortality of one's information. This information is of two types: the genetic, the programming of one's DNA, and the memetic, the elements of intellectual information individuals pass on in their society. "We are survival machines," he writes in The Selfish Gene, "robot vehicles blindly programmed to preserve the selfish molecules known as genes." And "just as genes propagate themselves in the gene pool by leaping from body to body via sperms or eggs, so memes propagate themselves in the meme pool b y leaping from brain to brain via a process which, in the broad sense, can be called imitation."(Dawkins, 1976, p.147) Support of probable genetic factors determining the direction of individuals' lifelong interests and behaviours increases. For instance, Alexander Graham Bell, who unintentionally invented the telephone whilst working on ways to help the hearing impaired, came from a family that was involved in working with problems of speech and sound. Both his mother and his wife were hard of hearing. His paternal grandfather wrote a book on phonetics and created a treatment for those who are loosing hearing, which was supported by his father and uncle.It is worth noting the gloomy history of efforts to connect cultural differences and social deviance to genetic "defects." In the early physiognomic literature on deviance, for example, Cesare Lombroso (Deam, 1989) wrote in the 1870s how deviants had extremely long legs in comparison with rest of their bodies, weird head shapes, absence of a appropriate chin, ingrown ear flaps or large ears. They were, he states, throwbacks to earlier phases of huma n development. In early 1900th was published The Blood of the Nation: A Study of the Decay of Races Through the Survival of the Unfit, an evil work by David Starr Jordon, the first President of

NKCC cotransporter Essay Example | Topics and Well Written Essays - 3000 words

NKCC cotransporter - Essay Example Of these NKCC1b is also known to be found in brain RNA (Gamba, 2005). It is noted here, though, that the two isoforms of the NKCC1 cotransporter is found only in the European eel (Anguilla anguilla) as per research of Cutler and Cramb, 2002. Nevertheless, there is ample evidence that NKCC1, in human and other mammalian species, is functionally implicated in CNS cells. It is observed by Gamba, 2005, that the NKCC1 cotransporter is activated by receptors and assists in neurotransmission by driving anions into the cell. It is also observed by Strange et al, 2000, that the work of the NKCC1 cotransporter complements that of the KCC2 one. The choice of the culture medium, the neuronal-specific CAD cell line, and the somewhat CNS-specific NKCC1 dovetails perfectly for a research attempt that seeks to establish new facts on the molecular identity and other expression patterns of these unique electroneutral cotransporters in cells of the central nervous system (CNS). G. Gamba's excellent 200 5 review article on these cotransporters has been extensively used in this paper because it is the most comprehensive document prepared to date being inclusive of all aspects described so far. The cation-coupled (Sodium and ... The Cation-Coupled Cotransport System The cation-coupled (Sodium and Potassium cations only) chloride cotransporters are a unique transmembranal transport system that is electrically neutral yet very effective in action (Gamba, 2005). These cotransporters constitute a secondary transcellular transport system that complements the primary cation transcellular transport system - the one mediated by the enzyme --ATPase. In the primary system the mover is an electrochemical gradient while in this chloride cotransporter system there is no such gradient, the reason why it has acquired the electroneutral label, and imbalances in chloride anion concentrations between intracellular and extracellular media constitute the prime mover of the system (Gamba, G., 2005). In absorptive and secretory epithelia there is need to transport ions and solutes in and out of the cells. Specific plasma membrane proteins mediate this transport system by either effecting sodium influx and potassium efflux with accompaniment of those ions and/or solutes that need to be transported (Gamba, G., 2005). Except in choroidal plexus, these cations move through the epithelial basolateral membrane mediated by the action of the enzyme --ATPase that creates an electrochemical gradient across the membrane. The plasma proteins mediate this transcellular transport that utilises this gradient to move target ions across the membrane and thus this system is called a secondary one while the enzyme-mediated cation movement is called the primary system. These two component systems together constitute the primary ion transport system across cellular membranes in human physiology (Gamba, G., 2005). On

Mythology and St. Patrick of Ireland Essay Example | Topics and Well Written Essays - 1500 words

Mythology and St. Patrick of Ireland - Essay Example As to Patrick's earliest beginnings, the Catholic Encyclopedia writes that St. Patrick was an, "Apostle of Ireland, born at Kilpatrick, near Dumbarton, in Scotland, in the year 387; died at Saul, Downpatrick, Ireland, 17 March, 493. [some sources say 460 or 461.-Ed.]," ("St. Patrick" p.1). In the study of historical figures, whether they are of the religious nature or not, it is most imperative to begin as far back in their lives as possible and moving forward from there. To question how and where Patrick was spiritually enlightened, the following section of the Catholic Encyclopedia best describes both parts. ... Known as a very spiritual man in later years leading to his declared sainthood and death, it is important to observe what lead him to that point and as the previous paragraph shows, it was something as horrible as slavery that lead him to find his spiritual center. Like many believers, St. Patrick found warmth and comfort of a magnitude that he may never have experienced before. As he says, the outside elements became non-existent to him and the power of prayer enveloped him in a protective shield and gave him the faith and courage, as well as the hope that surely was needed for him during such a horrific period of his life. "Admonished by an angel he after six years fled from his cruel master and bent his steps towards the west. He relates in his "Confessio" that he had to travel about 200 miles; and his journey was probably towards Killala Bay and onwards thence to Westport. He found a ship ready to set sail and after some rebuffs was allowed on board. In a few days he was among his friends once more in Britain, but now his heart was set on devoting himself to the service of God in the sacred ministry. We meet with him at St. Martin's monastery at Tours, and again at the island sanctuary of Lrins which was just then acquiring widespread renown for learning and piety; and wherever lessons of heroic perfection in the exercise of Christian life could be acquired, thither the fervent Patrick was sure to bend his steps. No sooner had St. Germain entered on his great mission at Auxerre than Patrick put himself under his guidance, and it was at that great bishop's hands that Ireland's future apostle was a few years later promoted to the priesthood. It is the tradition in the territory of the Morini that

Refilction Essay Example | Topics and Well Written Essays - 750 words

Refilction - Essay Example Integrity – Integrity means being above reproach in matters pertaining to leadership. In matters pertaining to ethical leadership, integrity forms an important pillar on which other attributes rest upon. It is impossible to practice ethical leadership when one’s integrity is questionable. Knowledge – This refers to understanding that is accrued with time from either studying or experience. In ethical leadership, knowledge is very important because knowledge is power and therefore only those leaders that have knowledge are able to wield power and lead others properly. Cooperation – This means closely working together with other people in order to accomplish tasks. It follows then that the success of ethical leadership is largely dependent on close working of leaders with the people that they lead. Integration of these Values into Leadership Style Integration of these values into ethical leadership is not an easy task that can be undertaken overnight but it is a process. In this process, the first thing is be aware of these values and then embody them within ourselves. Embodying these values simply means living them and letting them become part of our daily lives. In this regards, it becomes easy to lead a lifestyle that is emanating from what we believe in. After embracing these values as our inner core values, the next step is developing visions that are important avenues of expressing the core values within us. It then becomes very easy to integrate these values into ethical leadership via the values that we have developed. Supporting Core Values in Ethical Decision Making Supporting of core values in professional life especially in times when we have to make ethical decisions is very challenging. The first thing is to stand firm with our decisions and not allow us to reverse them. This is important because when we allow to be moved from the decisions that we make, it shows that we are not sure of ourselves and therefore we cannot b e trusted with challenges of leadership. In addition, it is not good to allow personal emotions to interfere with our decision making processes. This is because emotions usually temper with our ability to think clearly and objectively. When emotions are involved in our decision making, it is more likely that the wrong decisions will be made. My Five Greatest Strengths One of my greatest strengths is mental strength. Mental strength is the ability to clearly think through issues and make the correct choices. I came to learn about this strength sometimes back when I was chosen to head a task force in my work place. This task force was supposed to come up with recommendations on how to recruit new staff. Another strength that I have is multitasking whereby I can undertake different tasks at the same time. This strength is not very easy to master and I came to discover it during the time when I was heading that task force. At that time, I was supposed to handle different issues and matt ers besides delivering on my job. A third strength that I know I have is good interaction with other people around me. I have known of this strength since I was a small child when growing with my siblings. Even after I joined elementary school and my later school life, I was never without friends and people have always considered me a very social and likable person. The fourth strength that I h

San Francisco Essay Example | Topics and Well Written Essays - 1250 words

San Francisco - Essay Example This research will begin with the statement that Ishi belonged to the Yana tribe who lived in the southern region of the Mount Lassen foothills of Northern California. They lived a peaceful life of hunters-gatherers as the hills and mountains were bountiful hunting grounds for their food sources. However, as time passed by, the Yana became the victims of the powerful Winton, who drove them from their homes because they desired the fertile valleys of the Sacramento region. Though they were isolated, they were resilient and fierce fighters who terrorized their enemies especially the Winton. When the white settlers arrived, their perception was influenced by the Wintus stating that the Yanas were dangerous and had to be eradicated from the area. It was during this critical period that Ishi was born. From his childhood, Ishi had lived his life in fear and was always on the run. He had witnessed the systematic annihilation of his tribesmen and as his world grew smaller and smaller he bega n to struggle for survival. During the 1840’s, the Anglo- Saxon era was ushered in and with it a misfortune for the Yana tribe. Gold found in the river beds of California and the exchange of land claims saw the tragic wiping out of the Yana tribe. Immigrant people flushed out the Yana tribe by hunting, land staking and livestock pastures. Hunger took its toll on the population of the Yana tribe that plummeted down. None of Ishi’s Yana tribe was believed to have survived.... He was discovered on 29th August, 1911 and he was taken into custody by the Sheriff. Ishi was highly traumatized and almost dead and was put in a cell. Professors Waterman and Kroeber took charge of Ishi and kept him at the university’s museum and with great difficulty they managed to communicate with him by learning the Yahi language. Ishi too learned all about life in 20th century America. In the present day scenario, with the advent of globalization, many cultures are being lost or wiped out akin to what happened to the Yana tribe. In our contemporary world even with the great advancement of Science and Technology, we still experience the power of greed and unrest which take its toll on those who are most unfortunate. 3 2)Critically discuss the World’s Fair (California Mid – Winter International Exposition) of 1894. Cite specific examples of how we can think critically about this fair (e.g. commodification, race, gender, modernity, nature, etc.)Â   Michael Ha rry of San Francisco announced that he had plans to open the California Mid-Winter Fair in January 1894 in San Francisco. The local citizens were committed to the cause of the project and contributed around $41,500. The chief purpose of this fair was to promote trade, real estate and investment opportunities between California and people from other races and countries. Barbara Berglund in her book titled ‘Making San Francisco American,’ sheds light on San Francisco’s rapid evolution from the much earlier chaotic times to becoming a prized jewel of America’s western empire. She specifically points to the nascent elite’s efforts to bring about social order through cultural and political means. (Barbara Berglund, 2007) The chief idea

Lab report Geiger counter and its control unit Example | Topics and Well Written Essays - 500 words

Geiger counter and its control unit - Lab Report Example The behavior is illustrated inform of a curve of pulse height against applied voltage. Using the count rate C1 (beginning of the plateau) and the count rate C2 (almost 100 to 10 volts beyond C1). Both count rates were allocated operating voltages V1 and V2 respectively. The values of V and C were used to determine the slope of the plateau using an equation. Once the system is set up in an optimum condition, source 1 is placed on the split holder and the number of count rates per second is measured as N1. While the source is still in place, source 2 is placed in the holder and the equivalent count rate per second taken, as N12. Source 1 is now removed and the number of count rates per second is taken as N2. Finally, this can be used to calculate the dead time. The slope and the percentage slope of the curve can also be worked out from the count rates. The period of time, during and immediately following an ionization event, when the system is insensitive to a further radiation, is referred to as the Dead time. After placing the material in the holder and setting the voltage to a certain value, we stills didn’t record any count rate until we attained a certain value of EHT. This is because the energy is very low below that point to be able to separate them very fast. On the other hand, the behavior of the system depended on magnitude of the potential difference applied between the anode and the cathode. Radioactive material can be used to determine the operating voltage of the Geiger counter, the slope percentage of the plateau and the dead time of the counter. This simply involves radioactive material and recording its EHT and counts rate at a certain amount of time. The count measure occurs due to the radiation released and emitted by the material in the holder. When a specimen or material is in exited state, it means that it has absorbed

Human identity and relationships Assignment Example | Topics and Well Written Essays - 500 words

Human identity and relationships - Assignment Example Evidently, from the film there are instances of distortion on the character Shaw by the mother. On that note, she is seen referring to him as his little monster. In addition to that, the film also outlines the discrimination and the misinformation regarding punks as a possible source of stigma. The underserving of the population on the basis of the provision of essential services has contributed to the development of stigma in the society. Apparently, through the unequal serving of the population due to the inequity of resource distribution, stigma development has been boosted greatly. Apparently, the onset of mental conditions for instance stress and anxiety serve to drive an individual to engage into drug and alcoholism which consequently, leads to addiction thus when diagnosed, the two conditions are present. Notably, the model describes a simple way of enhancing the resilience in order to boosting the mental health. On the same point, mental health can be boosted through the promotion of resilience strategies and the minimizing of adverse experiences in the childhood stage. 10. What are some examples that you use for your own self-care in tending to your mental well-being. (Identify whether positive or negative)on the positive side, the engagement in playing computer games aids in the exercising my brain thus inhibiting the onset of mental conditions. Om the contrary, I enjoy watching movies over night as opposed to sleeping which serves to impact negatively on my mental

Food Cloning Essay Example for Free

Food Cloning Essay Food cloning is a very controversial topic to be discussed because of the large number of disagreements associated with it. Just like anything else in the world, it has positive and negative sides to it. The consumers all over the world only see the negative side. It is time that they now witness the benefits that cloned food brings along with it. This paper will outline these controversies and will describe how the media portrays them. It will also demonstrate the effect of food cloning on our culture, if there is any, and will highlight what this new technology can do for man’s future. Discussion Food cloning is basically obtaining food from cloned animals. How exactly does this work? It is as simple as this. Biotech companies clone animals such as cows, pigs and goats etc by taking the nuclei of cells from adults and combining them into other egg cells from which the nuclei have been extracted. Using this method, a large number of livestock have already been cloned for sale to producers (Reuters, 2003). The first cloned animal that was ever produced was a sheep in 1997. Since then, this technology has become more common and common with time. Because of this reason, the Food and Drug Authority asserted its control over cloning (Patel Rushefsky, 2002). Food cloning is a controversial topic since the time cloning of animals was introduced in 1997. Consumer groups all over the world want authorities to look in ethical and moral issues that are associated with cloning. People are not accepting this new technology and the benefits that come with it for a variety of reasons and controversies. The controversies largely have to do with the degree of safety of the meat, milk and other food products that are obtained from these cloned animals. Why is safety an issue? The answer to this question is obvious. Man is once again trying to intervene with nature and this may not give out the best results because man is subject to errors. Therefore, man will never be able to produce or reproduce animals and food products exactly like the ones present naturally with the help of science and technology and this difference is the main health concern of authorities all over the world. Another reason why cloned food is considered unsafe is that cloned animals usually have higher death rate, low life expectancy and are more prone to diseases (Poulter, 2008). Other safety issues that are considered to pose include the possibility of causing allergic reactions in human and unexpected genetic effects, altering of significant nutrients that are required, containing higher level of toxicants, reducing the effects of antibiotics, and others (Gralla, Gralla, 2004). After the famous Mary Shelly’s story in which she creates a Frankenstein, people have started to associate cloned animals with that as well. They fear that just like the Frankenstein turned against its creator, the food products obtained from cloned animals may also back fire. They think that just like the Frankenstein turned out to be harmful, cloned food products will also turn out to be harmful. Because of these health concerns, consumers all over are getting worried and concerned regarding whether of not the food products they are having are cloned or not. According to a source, companies now want their produced food products to be labeled as â€Å"clone free† so that their consumers can buy and consume food products without having to worry about safety issues. We can take the example of Ben and Jerry’s. Because of this non acceptance of the consumers, Ben and Jerry’s which is a popular ice cream producing company want to ensure their customers through media that the ice cream they produce comes from normal cows and not clones (The Associated Press, 2008). The media has a huge role to play in this. It made the debate regarding food cloning very open and all the concerns were right there in front of the consumers. Despite being confirmed as safe by the government, cloned food will not be accepted by consumers. However, the reality may be a lot different from this perception that the general public has regarding cloned food. Various legal authorities have given a green light to the use of cloned food as they consider it safe. These include the government, scientists and agencies like the Food and Drug Administration are using media to affirm the fact that there is no difference in food products from cloned animals and from conventional livestock. Stephen F. Sundlof, director of the Food and Drug Administration Center for Veterinary Medicine announced that â€Å"meat and milk from cattle, swine and goat clones is as safe to eat as the food we eat every day,† Both cloned and natural foods are equally safe and this also goes for the food obtained from off springs of cloned animals (The Associated Press, 2008). They say that there is nothing in the world that is completely natural, therefore there is no reason to stop when it comes to food and not use science and technology to use ways in which abundant food can be made available and that too at better quality. An example of potatoes is given. It is said that potatoes are not edible in their natural form as they are poisonous. Only after selective breeding, they are made edible (Crompton, 2007). Another point put forward to counter the argument of cloned animals being more prone to diseases and having a lower expectancy age is that the milk and meat obtained from cloned animals while they are healthy and alive will not harm the consumers in any way. Therefore there is no reason to be scared to consume such foods. The government and agencies like FDA have confirmed the safety of the foods but still the businesses are not ready to use cloned animals for their products. They fear that if they use such animals, they will have to label their products as ‘cloned’ and because of this people will not go for this product. However, their fear is logical because people are not ready as yet. We are living in a world where the population is increasing at a very rapid exponential rate. This increasing population will eventually demand food and the rate at which we are using up all our resources, it is predicted that very soon man will not have a lot to eat. We need to find better and newer ways which enable that we have abundant food supply for everyone in the world. Biotechnology is a new field that has been grown because of this. Cloned food is something that has been developed as a result. There were health concerns in the past regarding cloned food, but since now the government and other authorities like FDA have confirmed the safety of food obtained from cloned animals, we consumers must learn to accept it as in near future, this food will become a necessity and out only option. Conclusion In conclusion, I would once again like to emphasize on the need to accept such technologies. Food cloning was considered unsafe in the past because it is something new. Everything new has to go through a testing stage until it can be made ready to use. Similarly, food cloning has undergone the testing stage and it is now safe and ready to use. It is no longer the Frankenstein that it was once considered and because of this it has been made legal all over the world. References The Associated Press (2008) Cloned food may prompt ‘clone-free’ labels. Retrieved, 4 Oct, 2008, from MSNBC. Web site: http://www. msnbc. msn. com/id/16383458/ Crompton, S. (2007) Frankenstein’s monsters or the future of food? Retrieved, 4 Oct, 2008, from Times Online. Web site: http://women. timesonline. co. uk/tol/life_and_style/women/body_and_soul/article1461151. ece Gralla, J. D. Preston Gralla (2004) Complete Idiots Guide to Understanding Cloning. Alpha Books. Patel, K. Mark E. Rushefsky (2002) Health Care Policy in an Age of New Technologies. M. E. Sharpe. Poulter, S (2008) EU gives green light for cloned food to go on sale in UK shops. Retrieved, 4 Oct, 2008, from Daily Mail Online. Web site: http://www. dailymail. co. uk/health/article-507700/EU-gives-green-light-cloned-food-sale-UK-shops. html Reuters (2003) Cloned Food OK by FDA. Retrieved, 4 Oct, 2008, from Wired. Web site: http://www. wired. com/techbiz/media/news/2003/10/61038

Cult Films Essay Example for Free

Cult Films Essay Eccentric, offbeat, weird, unique and catering to esoteric tastes of a particularly small group and number of individuals, cult movies or cult films are the exact opposite of the blockbuster, hollywood and hollywood-type mainstream feature films being screened in major movie houses today. Cult movies usually acquire a cult following, groups of individuals whose particular tastes and interests fall under the films wing. Classic cult films which come to mind are that of Stanley Kubricks controversial A Clockwork Orange (1971), Francis Ford Coppolas anti-Vietnam war movie Apocalypse Now (1979), Ridley Scotts loose interpretation of a Philip K. Dick novel, Blade Runner (1982), and the quintessential cult classic The Rocky Horror Picture Show (1975) by Jim Sharman. While cult films range from a variety of genres such as crime, suspense, science fiction, horror and so on, some cult films are deemed uncategorizable and exist in a genre which could only be labeled as such: cult. The cast of characters which appear in most cult films are barely known to the general viewing public. These are artists who are in the initial stages of their careers, others gaining a certain degree of fame and recognition from the said cult movie, and on few occasions, a select number of renowned actors and actresses gracing the part of often particularly quirky and outrageously and/or obscuredly sketched characters in an equally obscure and eccentric setting and environment. The most recent cult films of today range from the local independent, to foreign movies packaged for different countries, to even top grossing movies well received by the mainstream movie viewing populace but regarded as a cult movie because of its ability to garner a particular group of dedicated following, which it would seem is growing in numbers, an example of such a cult movie is George Lucas Star Wars. The cult movie of today has taken a different form, although catering to esoteric tastes, these movies have also garnered a significant amount of mainstream appeal. Such is the case with Quentin Tarantinos Kill Bill, received by a greater number of following subsequent to his first cult flick, Pulp Fiction, which seemed to have revolutionized and brought considerably significant amount of impact to the aspect of film making as it deals with aesthetic, style and content. The apparent trashy content and material which critics refer to in Tarantinos film approach reflects and probably sums up cult ideologies and what cult movies are generally about. The movie viewing populace of today is becoming less discriminate and blurring lines of that of the cult and mainstream movies, and viewing these films for what they are, a pastiche of shared beliefs, opinions, ideologies and meanings as interpreted by a director who subscribes to individuality and captured on over an hour or so of reel and screen time. It may or may not reflect the particular persuasions and leanings of the general populace and the rest of the masses, but as long as it applies to one individual, and an esoteric few, it makes every amount of difference. References â€Å"Cult Films. † Film Site. Org. Tim Dirks. (2007) Retrieved 12 December 2007 http://www. filmsite. org/cultfilms. html â€Å"Top 50 Cult Films. † Entertainment Weekly. Retrieved 12 December 2007 http://5mtl. com/ft/culttop. htm â€Å"Top Cult Films. † Dermansky, Marcy and Fauth, Jurgen. Retrieved 12 December 2007 http://worldfilm. about. com.

The Impact Of Cell Phones: GPA

The Impact Of Cell Phones: GPA Cell phones adopted by young generation in recent year, have become global phenomena around the world. Thus, with the emergence of this technology almost everyone has tried to adopt these cell phones. We found in this research that cell phone usage had a negative impact on students GPA. Students using their cell phone during class, they also receiving and sending text messages during their class so they were able to pay less attention to lecture and thus it had negative impact on students performance. Key terms: Cell phones usage, Academic performance, GPA Introduction Commercialization of cellular phone technology has increased its use in recent years. In Pakistan total subscribers for cell phones till 12 September 2012 have reached to 120,513,430 (Pakistan Telecommunication Authority). The adoption of cell phones by young generation has been a global phenomenon in recent years. It has become an integral part of adolescents daily life and has become one of the most popular forms of communication. In todays world almost every student is having cell phone in their pocket, clipped to a belt, or hidden in a brief case or purse and knows perfect usage of it. As technology is growing every day at very fast rate, and is bringing positive and negative effects for society and so is with cell phone technology that has brought both positive and negative effects. It is commonly observed that these cell phones have also become status symbol for youth and they have indulged themselves in the competition of having best and most updated cell phone with maximum fe atures. Todays youth prefer cell phones more as compared to internet or any other social activity. Young people own cell phone and also want to upgrade it as soon as new model is launched in the market. Cell phones are that much involved in our life that the person who own cell phone is tend to be thought socially connected, independent, modern and in demand by the society. One of the most used applications of cell phones by our young generation is text messaging and these cellular network companies have also played a vital role in negatively affecting our young generation by introducing a number of packages for text messaging and calls also. Students of today are master in fastest text messaging and are seen text messaging while at home, at university, traveling ,in classroom and specially while studying. Communication with fellow students, professors, parents, and everyone else is just a click away. Most of the students use it for chatting with friends. This research paper explores the impact of cell phones` usage on students academic performance. We examined the effect of mobile usage on the grades among university students. Literature Review Cell phones and academic performance: The invention of cell phone has brought revolutionary change in the world. And thus bought change in the lifestyle of people using it including students. In 2005, the number of cell phone subscribers worldwide will reach 2 billion (Deloitte Research, 2005). And in Pakistan total fixed phone subscriber by December 2011 reached to only 3,098,117, less than mobile phone subscriber that were 120,151,253 till December 2011 (Pakistan Telecommunication Authority). Surveys have consistently shown that cell phone is used and loved more than television or internet by students, whether they are using internet or watching television they are having cell phone in their hands. Through common observation we also evaluated that students need to return to their home if they forget to take it with them. Thus with the emergence of this technology almost everyone has tried to adopt these cell phones and are addicted to its usage that they think their work done become difficult without its services and t hey are unable to stay connected with their friends and family. The main issue for teachers is the disturbance created in class room due to cell phone calls and texting. Combining this with the ease of hiding the device due to its small size, makes it very difficult for teachers to control it. Students are excited to find out that who has called and what the message is, young people are reluctant to turn off their cell phone during class time. Usually students kept their devices on during lectures with themselves and also sometimes forget to turn profile silent during class and its ringing create disturbance in class. Campbell (2006) found that students and faculty view the ringing of cell phone in class to be a serious problem. It is clear that if students spend time texting, they will not be able to pay attention to class lecture, will not be able to understand the topic and will not be able to produce good result in class, this will have impact on their grade points. Through common observation it is observed that today students are busy with this technology, spends 90% of their time with cell phones and dont pay attention to their studies. And if they pretend to their parents that they are studying in their room, they are actually dodging their parents, it is such a small device that they can easily hide them and lie with their parents. Students are trying to make as many friends whether girl or boy as they can, keeping themselves busy all day and night, as these network companies for their own profit have introduced a lots of cheap packages for call and messaging. All these activities in which students have engaged themselves in todays world are demolishing their present and future. After explaining negative aspect there are some positive impact also, it helps students to stay connected with their group members when assigned some group work from their teacher and can also contact their teachers in time of having any difficulty regarding their assignments. In school it also helps teacher to tell their parents about any serious problem happened to the students and also helps teacher to text their parent if they are absent from school. Students are supposed to use mobile phones whole night texting their friends. It is interesting to note that there are few common family rules about young peoples use of the cell phone. In fact, many adolescents (58%) reported that there were no rules set by their parents about their cell phone use and only 12% reported that their parents used removal of their cell phones from them as punishment (Metthews, 2004). Probably because of the sleeping issue it has been found that parents have to take cell phone from their children at night while going to sleep. Some reported that parents had to ask their children to stop using phone at night as then students are unable to wake up early in the morning for their university, school or college or they feel sleepy during class and do not pay proper attention. Along with academic performance cell phones have also positively and negatively affected social relationships. With the emergence of mobile phones individuals are able to stay connected with their friends, family and relatives living abroad. In addition to keeping up with social relationships, individuals have also been able to increase productivity with their work because they can be hundreds of miles away from the office, and still have instant access to their e-mail, documents and contacts wherever they are (Tully, 2003). A trend that is becoming more apparent is present absences; this is the concept of how an individuals presence in a social setting changes regardless of their physical presence, they are only half-present (Fortunati 2008). Individuals attending any meeting with their friends, coworkers, boss or any type of social activity, they leave that place during conversation as soon as their cell phone rings or vibrate. Even when sitting with their parents they do not hesit ate to go ahead and answer the call without thinking that this could hurt them. Through observation, researchers have found that individuals typically will not hesitate to interrupt an ongoing conversation to answer the ringing of their cell phone. Cell phones have given a new way to individuals to form new relationships and to strengthen existing ones. Teens admitted spending nearly an equal amount of time talking as they do texting each month. The feature is so important to them that if texting was no longer an option, 47 percent of teens say their social life would end or be worsened especially among females (54 percent compared to 40 percent of males) (CTIA Survey 2008). Before the emergence of mobile technology, individuals have regular interaction with one another. As they have very little telephonic contact with one another so they are used to visit each other homes regularly. Even if any one of the family member is in hospital, their loved ones even if out of city make a visit instantly or the next day but now with the emergence of cell phones people are supposed to just ask about their health on phone call with their cell phones. Cell phones also create a factor of safety among parents. Parents feel satisfied if their children are having cell phone with them while going outside as they can contact them whenever they want. Even in the time of emergency they can call them. Not only parents can contact their children in the time of difficulty but children can also contact them in emergencies. But children also sometime misuse this device by telling lie to their parents and doing whatever they want to do outside, as their parents are satisfied with their lie. On the other side this device along with disadvantages has helped children and parents both to stay in contact when outside their home. As everything in this world have advantages and disadvantages both and it is upon us how we utilize it. Hypothesis Cell phones` usage will have a negative effect on students` academic performance. Model Cell phone usage Academic performance Methodology The data was collected by distributing questionnaire to students of different universities in Pakistan with the ages ranging between eighteen and thirty. A sample size of 150 students was taken in which 65 respondents were male and 85 respondents were female. The survey consisted of 24 questions, including cell phone impacts on students academic performance and social relationship. Multiple choice questions were asked. The reliability of the instrument was calculated by using SPSS. The instrument was personally administered to the sample. Demographic information (e.g., age, gender, university, degree, GPA) was also collected. Results After successfully collecting the data through distributing questionnaires in different universities of Rawalpindi and Islamabad, we have inserted that data in SPSS software data sheet and run desired functions necessary to know that what impact does independent variable (cell phone usage ) have on dependent variable (students academic performance). We have evaluated students academic performance by considering their GPA. From the correlation results as shown in TABLE 1, we have find that cell phone usage is having negative impact on students GPA i.e. (r= -0.303, p

Symbolism and Allusion in Maya Angelous My Arkansas Essay -- Maya Ang

Symbolism and Allusion in Maya Angelou's "My Arkansas" "There is a deep brooding/ in Arkansas." Arkansas is stuck in the past, its memories of hatred and crime from ante-bellum days hindering the progression towards Civil Rights. Maya Angelou's poem of the struggle to a new wave of equality uses both general symbolism and historical allusion to make its theme clear to the reader. The poem uses general symbolism in nature, in time, and historical allusion to make the theme clear in a concise but vibrant poem. The general symbolism relating to nature assumes a common base of knowledge from which symbolism can be built. The poem opens with a description of Arkansas: "Old crimes like moss pend/ from poplar trees./ The sullen earth/ is much too/ red for comfort." The first example of general symbolism in this passage is the reference to moss. Moss is considered the base of the forest, the lowest level from which all of the other plants grow. Although moss is vital to a forest, it is often thought of as slimy and dirty. The moss "pend(s) from poplar trees," our second natural symbol. The poplar tree is weak and useless. Nothing can be built from its wood, and it often bends and breaks during storms. The visual image of the moss clinging to the poplar tree shows the slimy moss as "old crimes" and the poplar tree as the frail attempt at growth and a new but weak beginning. The reader gets a clear sense of the struggle toward a new life that is hindered and held back by the old, dependable moss t hat has been and always will be present. The second part of the passage discusses the "sullen earth" that is "much too red." Red earth can be symbolic in two ... ...e. Finally at the end of the poem the historical allusion brings the poem to a complete closure, and the theme of starting fresh is put into a more specific context. The "old hates" and "old crimes" are referring to those against African-Americans in the days of slavery. the new beginning for Arkansas is the attempt to reach equality, leaving the past behind. "Today is yet to come in Arkansas." Reading Angelou's poem shows the reader a new perspective on civil rights and its applicability in society. The use of general symbolism found in nature through the weak poplar tree hindered by moss and the cautious sun, paired with the historical allusion to the ante-bellum times make the theme of the poem clear. The past cannot be forgotten, and may hinder the future. Arkansas' struggle toward the future "writhes in awful/ waves of brooding" of the past.

Animation :: essays research papers

Animation   Ã‚  Ã‚  Ã‚  Ã‚  Animation is a visual technique that creates the illusion of motion, rather than recording motion through live action. The technique is used mainly for motion pictures. Animation can be created by illustrators, filmmakers, video makers, and computer specialists. Animation is most popular in creating cartoon movies. Advertisers also employ animation to develop commercials for television. In addition, producers of instructional films may use animation to help explain a difficult idea or one that could not be shown in live action. Animation can also be combined with live action in a movie. Many animators continue to make many drawings by hand. Since the mid-1980's, however, computer assistance combined with hand-drawn animation has become standard in many movie studios. These methods created such feature-length animated films as The Lion King (1994) and The Prince of Egypt (1998).   Ã‚  Ã‚  Ã‚  Ã‚  One increasingly important type of animation is computer-generated imagery (CGI), in which the computer creates the characters and backgrounds and animates them without actually photographing either cels or figures. Films made entirely with CGI include Toy Story (1995), Antz (1998), and A Bug's Life (1998).   Ã‚  Ã‚  Ã‚  Ã‚  Most CGI-animated characters start with a sketch or small sculpture called a â€Å"maquette† that is used for reference. The artist then creates a computer image called a wireframe model. The wireframe model serves as a framework for a shell or skin that gives the computer image a solid, three-dimensional appearance. To move the character, a computer animator changes the positions of the wireframe model in a number of key frames. The computer then supplies the frames between the key frames, moving the model from one of the animator's positions to the next.   Ã‚  Ã‚  Ã‚  Ã‚  After creating the three-dimensional model, the artist adds color, texture, and shading in a process known as texture mapping. Texture mapping makes the surfaces of the characters and scenery look real. A texture map can be created by a computer program or scanned from an actual photograph.   Ã‚  Ã‚  Ã‚  Ã‚  The final step is called rendering. During rendering, the computer calculates the effect of light, color, and texture on the model's surface. For a film or video, the computer will produce a two-dimensional digital picture of the characters for each frame of the animation. The computer artist usually adjusts many visual effects, such as camera focus and transparency, during the rendering phase.

Governmental Family Policy Essay -- Women Feminist Papers

Governmental Family Policy The modern working woman is struggling to balance work and family. The Second Wave of feminism has pushed her into the workforce, promising its ideals of equality in wages and in the home. However, many women find themselves in a world that devalues their work in home and in the workplace. Our society has not yet caught up to the Third Wave of feminism, which attempts to break down the traditional gender roles our constructions of work and family are based on. Many are hoping that government intervention through work policies that reflect the demands of an egalitarian family will be able to propel men and women out of the "stalled revolution". One must now address the question why the United States government is not following the lead of other industrialized nations if they are so supportive of "family values" and "moral values." Until there is a public outcry that can no longer be ignored, which is fast-approaching, the government can continue playing with words in order to avoid accountability. The problem exists with how these policies are categorized. The common term applied to such policies is "social benefits." This language alludes to the "social welfare state"-an ideal a liberal democracy like America does not strive to uphold. The American attitude for such concerns is usually along the lines of "you have your rights, now work it out for yourself." However, it is crucial to break down the relation between these family-friendly policies and the word "benefits." Progressive policies do not predominantly "benefit" working mothers. Without such policies, women cannot pursue their right to earn a living in the same way a man could. Earning a living is not a "benefit," equal opportunity fo... ...ing Job For Kids." 21 Jan. 2003 http://lexis-nexis.com Coltrane, Scott. Family Man. New York: Oxford UP. (1996). Contemporary Women's Issues. March 2003. Vol. 52, No.2. http://lexis-nexis.com De Pasquale, Lisa. "The PC Workplace." The Washington Times. 27 April 2003. http://lexis-nexis.com English, Holly. "Workplace Issues; When employers deal with 'gender issues,' they need to include men." Legal Times. 10 Nov. 2003. http://lexis-nexis.com Fuss, Diana.. "Inside/Out." Critical Encounters: Reference and Responsibility in Deconstructive Writing. New Brunswick: Rutgers University Press, 1995. 233-240. Hochschild, Arlie. The Second Shift. New York: Rutledge Publishing, Inc. (1995). Gerson, Kathleen and Jacobs, Jerry A. Changing the Structure and Culture of Work. Journal of Women's History. September 2003. Vol. 15, No.3. http://lexis-nexis.com

Human Nature: Good or Bad?

The great philosopher Socrates said â€Å"the unexamined life is not worth living. † We are forced to examine our lives at some point by the pressing questions of our own nature. The answers to questions of our goodness or badness are answered every day by our actions and the actions of those around us. One doesn’t have to look far to see both the best and the worst of who we are as a species. Axe body spray and perfumes for men is known to be one of the most sexist and misogynistic companies around.Their commercials depict women as sexual objects, to be rounded up by perfume and used for the wearers desire. Antithetical to that, Dove is known for it’s Real Beauty campaign. Empowering women to be proud of who they are and what they look like, Dove makes great efforts in the self-respect movement. Something that is little known to the general population is that these two brands are owned by the same big corporation: Unilever. This is an example of how people take advantage of other peoples values and circumstances.All they want is money. Large corporations don’t care if you get the girl or if you feel beautiful, they are just trying to make as much money as possible. It is evident that they take advantage of young peoples desires to feel wanted, and many peoples desires to feel comfortable in their own skin for their own benefits, no matter the contradiction in values. Cancer is something everyone will experience in their lives. At some point in any given life, someone will encounter cancer in themselves or a loved one.In New Zealand, an organisation called Project Promise was raising funds to build a cancer research hospital. They were $383,000 short of what they needed, and time was running out. When the members of the organisations were beginning to lose hope, someone donated one million dollars. They set out to find who it was, but the donor wanted to remain anonymous. This was selflessness as best we know it. The concept of altru ism is one under debate on it’s own; but the idea of altruism in a broad sense is displayed here.Whoever donated this money was not out for a material return or accolades from their peers. Perhaps this amount was much to give, perhaps not; either way, it was needed and someone gave it. The anonymity let the donor do something good without receiving material or social benefits, showing that selflessness is possible. Hurricane Sandy happened last year and caused devastation for the residents along the Jersey shore. So many people were left homeless and there weren’t many police officers or law enforcement agents around to keep control of the situation.Many people were considered heroes in this situation; giving up their time and resources to help those who lost everything. There are still people helping those who became homeless, and some still who are giving more of their time and efforts to set up programs for the mentally ill to cater to their specific needs. However, there have also been looters. People who took whatever they could find from wherever they could find it. There are construction companies who are taking advantage of desperate families and committing fraud.They are scamming people who already have nothing to take even that away. With no restraints, people do anything, whether good or bad. Religious institutions are more and more in the news with both good and bad happenings within. Religious institutions have been called out for the wrongdoings they have condoned, and praised for the good things they have condoned. The new Pope has made a big step in telling catholics around the world to stop hate and move on from certain issues that have lead to exclusion of certain groups from the church.By telling the world of catholics that they â€Å"cannot insist only on issues related to abortion, gay marriage and the use of contraceptive methods†, he opened a window for people to get over these things and accept people for who they a re. Stephen Weinberg said that â€Å"with or without [religion] you would have good people doing good things and evil people doing evil things. But for good people to do evil things, that takes religion. † Religion gives people reasons to do atrocious things. If one believes their god tells you to do something under threat of eternal torture, one will do anything.Honour killings, terrorism, hate speech, telling people in AIDS-ridden countries not to use condoms, and systematically moving rapist priests to different churches instead of prosecuting them are all things done in the name of god. Most people would agree that these things are not good things. Government does nothing to control human nature but create the laws to which citizens must abide by. By looking around the world at various governments, it is evident that people will act how they naturally are independent of government.Government only tries to regulate a forced goodness in people. In Syria, China, Egypt, Irela nd, Germany, and Canada- all around the world and in all forms of government- people do great and terrible things. However, contrary to that is the example of the country of North Korea. In North Korea it is completely illegal to have differing opinions to the one that the government has. If it is found that someone has different ideas of how things should be, their family, including them, is thrown into concentration camps.In this case, the government is being completely controlling of everything everyone does, thinks, and feels in reaction to anything. There are people in this world who do the right things, people who do the wrong things, and some are indifferent. It is illogical and unfair to generalise seven billion people and counting into one fixed human nature. People make choices every day, and those choices are based on both what one knows and what one doesn’t know; the choices made by an individual may vary depending on what their circumstances are. Other peoples ch oices can change what may have happened.Ilyas Kassam said that â€Å"an over examination of life can deter you from life itself. † There are times when it is helpful and important to examine one's life and think about what it means to be human. The conclusion I have drawn about our nature is that we don’t have a nature. To find out whether someone is a kind or evil person it is necessary to learn about them, to know their circumstances, and to try and understand why they make the choices they do. There will always be evil people, but the one thing to keep hope for is the fact that there will always be good people too.

Cultural Similarities and Differences

The Indian culture has different languages, which include Hindi, Bengali, and Urdu. The officially recognized language is Hindi with other local languages not recognized by the central government. Texans officially use American English with various variations and accents. Australian languages Include Australian slang, Indigenous Australian languages, and variations of Australian English (Dally, 1998). Nigeria has over 50 indigenous languages with very many local dialects. The predominant languages are Your, Bio, Afro -Asiatic and Kanji. The official language is English ND Is used across all states to unite the people.Except India, the other three countries share a salary language (I. E. English) though It has small variations In accent and pronunciation. Family Systems Indians maintain close personal ties with their families including the extended family members. Family relationships are hierarchical and the father is the patriarchal leader of the family. All members have mutual obli gations to their families and they maintain deep rooted trust among all relatives (Maker, 2008). Nigerian maintain an extended family system with relationships guided by hierarchy and seniority.Individuals are obliged to give the extended family members financial assistance and guidance (Coelenterates. N. D). The American family unit Is nuclear with the extended family living away from it. Individualism is highly practiced. The family set ups across the four countries recognizes the father as the head of the family. The role of extended family members is emphasized in Nigerian and Indian cultures where people recognize the senior members of the society. Australian and Texan cultures emphasize individualism and the societies generate highly independent people. Behavioral NormsIn India, greetings follow seniority with the most senior person being greeted first. Though shaking hands Is common, men seldom shake hands with women because of religious beliefs and It Is mandatory to bid eac h person farewell Individually when leaving a group. In Nigeria, shaking hands is the most common form of greeting. Men 1 OFF other person's well being. Direct eye contact is avoided when meeting with older and senior members of the society and as a sign of respect one is expected to bow. Nigerian place importance to professional titles and surnames. In Texas greetings are casual, a handshake, a smile, and a hello are enough.Men use only handshakes but women and children may hug and shake hands even in formal settings. Introductions are very important before any communication. It is considered rude to call senior persons by their first name. Men are supposed to be polite to ladies, they pull chairs and open doors for them and ladies are expected to say a polite thank you in return (Celebrities, 2012). Australian forms of greetings are informal and brief; shaking hands is common in formal setups. Ladies generally do not greet each other. Australians maintain good relationships with a ll people as they are down to earth ND modest.Religion India is a secular state with a lot of religious diversity. Hinduism, Buddhism, Jansenism, and Schism are practiced by most of the people. Christianity is practiced by a minority. Texas has a wide range of religious diversity with Christianity being practiced by the majority. Adherence levels are very high and individual religious beliefs are tolerated. Religious diversity in Nigeria is great with Christianity and Islam being practiced by the majority. Native religions that believe in deities, spirits, and ancestral worship are spread throughout the country. The country constitution remunerates freedom of worship.Majority of Australians are Christians with Islam being practiced by a few. Traditional aborigine religious cultures are practiced by a few aborigines as the others have converted to Christianity. The country laws are tolerant to different religious beliefs. Across the four countries, religion influences the culture of the people with Christianity, Salamis, Hinduism, and Judaism being recognized and accepted by the societies. Freedom of worship is allowed by their respective constitutions; but in Nigeria emergence of radical Salamis has affected he culture of the societies living in the affected areas.Business Etiquette There are various ways in which business is approached in various societies. In Indian society, it is customary for all sides to personally know each other before any business transaction take place. Business meetings are planned by appointments and punctuality is kept as a sign of mutual respect. Negotiations are non confrontational and the final decision is made by the person with the most authority. Decision making is slow and informal and successful negotiations are concluded by a word of mouth and celebrated over a meal. Formal dressing during meetings is expected and shows respect.In the Nigerian culture, developing a personal relationship is essential before any business tra nsaction. Business is conducted in a formal setup and decision making involves all the stakeholders. Nigerian are overly suspicious and proceed with business cautiously. Punctuality for meetings is very important to Texans and it is a sign of disrespect to be late. There is little emphasis on small talk and business is conducted rapidly. To conduct business, an appointment is necessary in Australia. Business is conducted rapidly in a relaxed environment. Personal relationships and show of emotion is not important in their business transactions.Conclusion The culture across all the four countries is steeped with differences and similarities continually changing with advent of globalization and information technology. The family and religious inclinations of these societies fundamentally influences their behavior, norms, and way of thinking. The cultures have inherent mechanisms of maintaining their way of life. In all the cultures, younger members are expected to respect their elders and this maintains social order. Though fundamentally different, arioso cultures have a lot to teach and are universally almost the same.

Powder Metallurgy

Powder metallurgy is the process of blending fine powdered materials, pressing them into a desired shape or form (compacting), and then heating the compressed material in a controlled atmosphere to bond the material (sintering). The powder metallurgy process generally consists of four basic steps: (1) powder manufacture, (2) powder blending,(3) compacting, (4) sintering. Compacting is generally performed at room temperature, and the elevated-temperature process of sintering is usually conducted at atmospheric pressure. Optional secondary processing often follows to obtain special properties or enhanced precision. 1] Two main techniques used to form and consolidate the powder are sintering and metal injection molding. Recent developments have made it possible to use rapid manufacturing techniques which use the metal powder for the products. Because with this technique the powder is melted and not sintered, better mechanical strength can be accomplished. History and capabilities The hi story of powder metallurgy (PM) and the art of metals and ceramics sintering are intimately related to each other. Sintering involves the production of a hard solid metal or ceramic piece from a starting powder. While a crude form of iron powder metallurgy existed in Egypt as early as 3000 B. C, and the ancient Incas made jewelry and other artifacts from precious metal powders, mass manufacturing of P/M products did not begin until the mid-or late- 19th century†. [2] In these early manufacturing operations, iron was extracted by hand from metal sponge following reduction and was then reintroduced as a powder for final melting or sintering. A much wider range of products can be obtained from powder processes than from direct alloying of fused materials.In melting operations the â€Å"phase rule† applies to all pure and combined elements and strictly dictates the distribution of liquid and solid phases which can exist for specific compositions. In addition, whole body mel ting of starting materials is required for alloying, thus imposing unwelcome chemical, thermal, and containment constraints on manufacturing. Unfortunately, the handling of aluminium/iron powders poses major problems. [3] Other substances that are especially reactive with atmospheric oxygen, such as tin, are sinterable in special atmospheres or with temporary coatings. 4] In powder metallurgy or ceramics it is possible to fabricate components which otherwise would decompose or disintegrate. All considerations of solid-liquid phase changes can be ignored, so powder processes are more flexible than casting, extrusion, or forging techniques. Controllable characteristics of products prepared using various powder technologies include mechanical, magnetic,[5] and other unconventional properties of such materials as porous solids, aggregates, and intermetallic compounds. Competitive characteristics of manufacturing processing (e. g. , tool wear, complexity, or vendor options) also may be c losely regulated.Powder Metallurgy products are today used in a wide range of industries, from automotive and aerospace applications to power tools and household appliances. Each year the international PM awards highlight the developing capabilities of the technology. [6] Isostatic powder compacting Isostatic powder compacting is a mass-conserving shaping process. Fine metal particles are placed into a flexible mould and then high gas or fluid pressure is applied to the mould. The resulting article is then sintered in a furnace. This increases the strength of the part by bonding the metal particles.This manufacturing process produces very little scrap metal and can be used to make many different shapes. The tolerances that this process can achieve are very precise, ranging from +/- 0. 008  inches (0. 2  mm) for axial dimensions and +/- 0. 020  inches (0. 5  mm) for radial dimensions. This is the most efficient type of powder compacting. (The following subcategories are also from this reference. )[7] This operation is generally applicable on small production quantities, as it is more costly to run due to its slow operating speed and the need for expendable tooling. oda[8] Compacting pressures range from 15,000  psi (100,000 kPa) to 40,000  psi (280,000 kPa) for most metals and approximately 2,000  psi (14,000  kPa) to 10,000  psi (69,000 kPa) for non-metals. The density of isostatic compacted parts is 5% to 10% higher than with other powder metallurgy processes. Equipment There are many types of equipment used in Powder Compacting. There is the mold, which is flexible, a pressure mold that the mold is in, and the machine delivering the pressure. There are also controlling devices to control the amount of pressure and how long the pressure is held for.The machines need to apply anywhere from 15,000 psi to 40,000 psi for metals. Geometrical Possibilities Typical workpiece sizes range from 0. 25  in (6. 35  mm) to 0. 75  in (19. 05  mm) t hick and 0. 5  in (12. 70  mm) to 10  in (254  mm) long. It is possible to compact workpieces that are between 0. 0625  in (1. 59  mm) and 5  in (127  mm) thick and 0. 0625  in (1. 59  mm) to 40  in (1,016  mm) long. Tool style Isostatic tools are available in three styles, free mold (wet-bag), coarse mold(damp-bag), and fixed mold (dry-bag). The free mold style is the traditional style of isostatic compaction and is not generally used for high production work.In free mold tooling the mold is removed and filled outside the canister. Damp bag is where the mold is located in the canister, yet filled outside. In fixed mold tooling, the mold is contained within the canister, which facilitates automation of the process. Hot isostatic pressing Hot isostatic pressing (HIP) compresses and sinters the part simultaneously by applying heat ranging from 900 °F (480 °C) to 2250 °F (1230 °C). Argon gas is the most common gas used in HIP because it is an inert gas, thus prevents chemical reactions during the operation. Cold isostatic pressingCold isostatic pressing (CIP) uses fluid as a means of applying pressure to the mold at room temperature. After removal the part still needs to be sintered. Design Considerations Advantages over standard powder compaction are the possibility of thinner walls and larger workpieces. Height to diameter ratio has no limitation. No specific limitations exist in wall thickness variations, undercuts, reliefs, threads, and cross holes. No lubricants are need for isostatic powder compaction. The minimum wall thickness is 0. 05  inches (1. 27  mm) and the product can have a weight between 40 and 300 pounds (18 and 136  kg).There is 25 to 45% shrinkage of the powder after compacting. Powder production techniques Any fusible material can be atomized. Several techniques have been developed which permit large production rates of powdered particles, often with considerable control over the size ranges of the final grain population. Powders may be prepared by comminution, grinding, chemical reactions, or electrolytic deposition. Powders of the elements titanium, vanadium, thorium, niobium, tantalum, calcium, and uranium have been produced by high-temperature reduction of the corresponding nitrides and carbides.Iron, nickel, uranium, and beryllium submicrometre powders are obtained by reducing metallic oxalates and formates. Exceedingly fine particles also have been prepared by directing a stream of molten metal through a high-temperature plasma jet or flame, simultaneously atomizing and comminuting the material. On Earth various chemical- and flame-associated powdering processes are adopted in part to prevent serious degradation of particle surfaces by atmospheric oxygen. Atomization Atomization is accomplished by forcing a molten metal stream through an orifice at moderate pressures.A gas is introduced into the metal stream just before it leaves the nozzle, serving to create turbulence as the entrained gas expands (due to heating) and exits into a large collection volume exterior to the orifice. The collection volume is filled with gas to promote further turbulence of the molten metal jet. On Earth, air and powder streams are segregated using gravity or cyclonic separation. Most atomised powders are annealed, which helps reduce the oxide and carbon content. The water atomized particles are smaller, cleaner, and nonporous and have a greater breadth of size, which allows better compacting.Simple atomization techniques are available in which liquid metal is forced through an orifice at a sufficiently high velocity to ensure turbulent flow. The usual performance index used is the Reynolds number R = fvd/n, where f = fluid density, v = velocity of the exit stream, d = diameter of the opening, and n = absolute viscosity. At low R the liquid jet oscillates, but at higher velocities the stream becomes turbulent and breaks into droplets. Pumping energy is applied to droplet form ation with very low efficiency (on the order of 1%) and control over the size distribution of the metal particles produced is rather poor.Other techniques such as nozzle vibration, nozzle asymmetry, multiple impinging streams, or molten-metal injection into ambient gas are all available to increase atomization efficiency, produce finer grains, and to narrow the particle size distribution. Unfortunately, it is difficult to eject metals through orifices smaller than a few millimeters in diameter, which in practice limits the minimum size of powder grains to approximately 10 ? m. Atomization also produces a wide spectrum of particle sizes, necessitating downstream classification by screening and remelting a significant fraction of the grain boundary.Centrifugal disintegration Centrifugal disintegration of molten particles offers one way around these problems. Extensive experience is available with iron, steel, and aluminium. Metal to be powdered is formed into a rod which is introduced into a chamber through a rapidly rotating spindle. Opposite the spindle tip is an electrode from which an arc is established which heats the metal rod. As the tip material fuses, the rapid rod rotation throws off tiny melt droplets which solidify before hitting the chamber walls.A circulating gas sweeps particles from the chamber. Similar techniques could be employed in space or on the Moon. The chamber wall could be rotated to force new powders into remote collection vessels,[9] and the electrode could be replaced by a solar mirror focused at the end of the rod. An alternative approach capable of producing a very narrow distribution of grain sizes but with low throughput consists of a rapidly spinning bowl heated to well above the melting point of the material to be powdered.Liquid metal, introduced onto the surface of the basin near the center at flow rates adjusted to permit a thin metal film to skim evenly up the walls and over the edge, breaks into droplets, each approximately the thickness of the film. [10] Other techniques Another powder-production technique involves a thin jet of liquid metal intersected by high-speed streams of atomized water which break the jet into drops and cool the powder before it reaches the bottom of the bin. In subsequent operations the powder is dried. This is called water atomisation.The advantage is that metal solidifies faster than by gas atomization since the heat capacity of water is some magnitudes higher, mainly a result of higher density. Since the solidification rate is inversely proportional to the particle size smaller particles can be made using water atomisation. The smaller the particles, the more homogeneous the micro structure will be. Notice that particles will have a more irregular shape and the particle size distribution will be wider. In addition, some surface contamination can occur by oxidation skin formation. Powder can be reduced by some kind of pre-consolidation treatment as annealing. sed for cerami c tool Powder compaction [pic] [pic] Rhodium metal: powder, pressed pellet (3*105 psi), remelted Powder compaction is the process of compacting metal powder in a die through the application of high pressures. Typically the tools are held in the vertical orientation with the punch tool forming the bottom of the cavity. The powder is then compacted into a shape and then ejected from the die cavity. [7] In a number of these applications the parts may require very little additional work for their intended use; making for very cost efficient manufacturing.The density of the compacted powder is directly proportional to the amount of pressure applied. Typical pressures range from 80 psi to 1000 psi, pressures from 1000 psi to 1,000,000 psi have been obtained. Pressure of 10 tons/in? to 50 tons/in? are commonly used for metal powder compaction. To attain the same compression ratio across a component with more than one level or height, it is necessary to work with multiple lower punches. A c ylindrical workpiece is made by single-level tooling. A more complex shape can be made by the common multiple-level tooling. Production rates of 15 to 30 parts per minutes are common.There are four major classes of tool styles: single-action compaction, used for thin, flat components; opposed double-action with two punch motions, which accommodates thicker components; double-action with floating die; and double action withdrawal die. Double action classes give much better density distribution than single action. Tooling must be designed so that it will withstand the extreme pressure without deforming or bending. Tools must be made from materials that are polished and wear-resistant. Better workpiece materials can be obtained by repressing and re-sintering. Here is a table of some of the obtainable properties. Introduction | |[pic] | | | |Powder metallurgy uses sintering process for making various parts out of metal powder. The metal powder is compacted by placing in a closed| |meta l cavity (the die) under pressure. This compacted material is placed in an oven and sintered in a controlled atmosphere at high | |temperatures and the metal powders coalesce and form a solid.A second pressing operation, repressing, can be done prior to sintering to | |improve the compaction and the material properties. | |[pic] | |The properties of this solid are similar to cast or wrought materials of similar composition. Porosity can be adjusted by the amount of | |compaction. Usually single pressed products have high tensile strength but low elongation. These properties can be improved by repressing | |as in the following table. |Material | |Tensile | |MPa | |(psi) | |Tensile | |as Percent of Wrought Iron Tensile | |Elongation | |in 50 mm    | |(2 in) | |Elongation | |as Percent of Wrought Iron Elongation | | | |Wrought Iron, Hot Rolled | |331 | |(48,000) |100 % | |30 % | |100 % | | | |Powder Metal, 84 % density | |214 | |(31,000) | |65 % | |2 % | |6% | | | |Powder Metal, repressed, 95 % density | |283 | |(41,000) | |85 % | |25 % | |83 % | | | |Powder metallurgy is useful in making parts that have irregular curves, or recesses that are hard to machine. It is suitable for high | |volume production with very little wastage of material. Secondary machining is virtually eliminated. |Typical parts that can be made with this process include cams, ratchets, sprockets, pawls, sintered bronze and iron bearings (impregnated | |with oil) and carbide tool tips. | | | |Design Considerations | |[pic] | | | |†¢ | |Part must be so designed to allow for easy ejection from the die. Sidewalls should be perpendicular; hole axes should be parallel to the | |direction of opening and closing of the die. | | |†¢ | |Holes, even complicated profiles, are permissible in the direction of compressing. The minimum hole diameter is 1. 5 mm (0. 060 in). | | | |†¢ | |The wall thickness should be compatible with the process typically 1. 5 mm (0. 060 in ) minimum. Length to thickness ratio can be upto 18 | |maximum-this is to ensure that tooling is robust.However, wall thicknesses do not have to be uniform, unlike other processes, which offers| |the designer a great amount of flexibility in designing the parts. | | | |†¢ | |Undercuts are not acceptable, so designs have to be modified to work around this limitation. Threads for screws cannot be made and have to | |be machined later. | | | |†¢ | |Drafts are usually not desirable except for recesses formed by a punch making a blind hole.In such a case a 2-degree draft is recommended. | |Note that the requirement of no draft is more relaxed compared to other forming processes such as casting, molding etc. | | | |†¢ | |Tolerances are 0. 3 % on dimensions. If repressing is done, the tolerances can be as good as 0. 1 %. Repressing, however, increases the cost | |of the product. | | | Powder Metallurgy – Processing | | | |Topics Covered | |Materials | | |Powde r Consolidation | | |Cold Uniaxial Pressing | | |Cold Isostatic Pressing | | |Sintering | | |Hot Isostatic Pressing | | |Hot Forging (Powder Forging) | | |Metal Injection Moulding (MIM) | | |Materials | |The majority of the structural components produced by fixed die pressing are iron based.The powders are elemental, pre-alloyed, or partially | |alloyed. Elemental powders, such as iron and copper, are easy to compress to relatively high densities, produce pressed compacts with adequate| |strength for handling during sintering, but do not produce very high strength sintered parts. | |Pre-alloyed powders are harder, less compressible and hence require higher pressing loads to produce high density compacts. However, they are | |capable of producing high strength sintered materials. Pre-alloying is also used when the production of a homogeneous material from elemental | |powders requires very high temperatures and long sintering times.The best examples are the stainless steels, who se chromium and nickel | |contents have to be pre-alloyed to allow economic production by powder metallurgy. | |Partially alloyed powders are a compromise approach. Elemental powders, e. g. Iron with 2 wt. % Copper, are mixed to produce an homogeneous | |blend which is then partially sintered to attach the copper particles to the iron particles without producing a fully diffused powder but | |retaining the powder form. In this way the compressibilities of the separate powders in the blend are maintained and the blend will not | |segregate during transportation and use. | |A similar technique is to ‘glue’ the small percentage of alloying element onto the iron powder.This ‘glueing’ technique is successfully used | |to introduce carbon into the blends, a technique which prevents carbon segregation and dusting, producing so-called ‘clean’ powders. | |Powder Consolidation | |Components or articles are produced by forming a mass of powder into a shap e, then consolidating to form inter-particle metallurgical bonds. | |An elevated temperature diffusion process referred to as sintering, sometimes assisted by external pressure, accomplishes this. The material | |is never fully molten, although there might be a small volume fraction of liquid present during the sintering process. Sintering can be | |regarded as welding the particles present in the initial useful shape. |As a general rule both mechanical and physical properties improve with increasing density. Therefore the method selected for the fabrication | |of a component by powder metallurgy will depend on the level of performance required from the part. Many components are adequate when produced| |at 85-90% of theoretical full density (T. D. ) whilst others require full density for satisfactory performance. | |Some components, in particular bush type bearings often made from copper and its alloys, are produced with significant and controlled levels | |of porosity, the porosity being subsequently filled with a lubricant. | |Fortunately there is a wide choice of consolidation techniques available. |Cold Uniaxial Pressing | |Elemental metal, or an atomised prealloyed, powder is mixed with a lubricant, typically lithium stearate (0. 75 wt. %), and pressed at pressures| |of say, 600 MPa (87,000 lb/in2) in metal dies. Cold compaction ensures that the as-compacted, or ‘green’, component is dimensionally very | |accurate, as it is moulded precisely to the size and shape of the die. | |Irregularly shaped particles are required to ensure that the as-pressed component has a high green strength from the interlocking and plastic | |deformation of individual particles with their neighbours. |One disadvantage of this technique is the differences in pressed density that can occur in different parts of the component due to | |particle/particle and die wall/particle frictional effects. Typical as-pressed densities for soft iron components would be 7. 0 g/cc, i. e. | |about 90% of theoretical density. Compaction pressure rises significantly if higher as-pressed densities are required, and this practice | |becomes uneconomic due to higher costs for the larger presses and stronger tools to withstand the higher pressures. | |Cold Isostatic Pressing | |Metal powders are contained in an enclosure e. g. a rubber membrane or a metallic can that is subjected to isostatic, that is uniform in all | |directions, external pressure.As the pressure is isostatic the as-pressed component is of uniform density. Irregularly shaped powder | |particles must be used to provide adequate green strength in the as-pressed component. This will then be sintered in a suitable atmosphere to | |yield the required product. | |Normally this technique is only used for semi-fabricated products such as bars, billets, sheet, and roughly shaped components, all of which | |require considerable secondary operations to produce the final, accurately dimensioned component. Agai n, at economical working pressures, | |products are not fully dense and usually need additional working such as hot extrusion, hot rolling or forging to fully density the material. |Sintering | |Sintering is the process whereby powder compacts are heated so that adjacent particles fuse together, thus resulting in a solid article with | |improved mechanical strength compared to the powder compact. This â€Å"fusing† of particles results in an increase in the density of the part and | |hence the process is sometimes called densification. There are some processes such as hot isostatic pressing which combine the compaction and | |sintering processes into a single step. | |After compaction the components pass through a sintering furnace. This typically has two heating zones, the first removes the lubricant, and | |the second higher temperature zone allows diffusion and bonding between powder particles. A range of atmospheres, including vacuum, are used | |to sinter different mate rials depending on their chemical compositions.As an example, precise atmosphere control allows iron/carbon materials| |to be produced with specific carbon compositions and mechanical properties. | |The density of the component can also change during sintering, depending on the materials and the sintering temperature. These dimensional | |changes can be controlled by an understanding and control of the pressing and sintering parameters, and components can be produced with | |dimensions that need little or no rectification to meet the dimensional tolerances. Note that in many cases all of the powder used is present | |in the finished product, scrap losses will only occur when secondary machining operations are necessary. |Hot Isostatic Pressing | |Powders are usually encapsulated in a metallic container but sometimes in glass. The container is evacuated, the powder out-gassed to avoid | |contamination of the materials by any residual gas during the consolidation stage and sealed-off. It is then heated and subjected to isostatic| |pressure sufficient to plastically deform both the container and the powder. | |The rate of densification of the powder depends upon the yield strength of the powder at the temperatures and pressures chosen. At moderate | |temperature the yield strength of the powder can still be high and require high pressure to produce densification in an economic time.Typical| |values might be 1120 °C and 100 MPa for ferrous alloys. By pressing at very much higher temperatures lower pressures are required as the yield | |strength of the material is lower. Using a glass enclosure atmospheric pressure (15 psi) is used to consolidate bars and larger billets. | |The technique requires considerable financial investment as the pressure vessel has to withstand the internal gas pressure and allow the | |powder to be heated to high temperatures. | |As with cold isostatic pressing only semifinished products are produced, either for subsequent working to sma ller sizes, or for machining to | |finished dimensions. |Hot Forging (Powder Forging) | |Cold pressed and sintered components have the great advantage of being close to final shape (near-nett shape), but are not fully dense. Where | |densification is essential to provide adequate mechanical properties, the technique of hot forging, or powder forging, can be used. | |In powder forging an as-pressed component is usually heated to a forging temperature significantly below the usual sintering temperature of | |the material and then forged in a closed die. This produces a fully dense component with the shape of the forging die and appropriate | |mechanical properties. |Powder forged parts generally are not as close to final size or shape as cold pressed and sintered parts. This results from the allowances | |made for thermal expansion effects and the need for draft angles on the forging tools. Further, minimal, machining is required but when all | |things are considered this route is of ten very cost effective. | |Metal Injection Moulding (MIM) | |Injection moulding is very widely used to produce precisely shaped plastic components in complex dies. As injection pressures are low it is | |possible to manufacture complex components, even some with internal screw threads, by the use of side cores and split tools. |By mixing fine, typically less than 20 ? m diameter, spherical metal powders with thermoplastic binders, metal filled plastic components can be| |produced with many of the features available in injection moulded plastics. After injection moulding, the plastic binder material is removed | |to leave a metal skeleton which is then sintered at high temperature. | |Dimensional control can be exercised on the as-sintered component as the injected density is sensibly uniform so shrinkage on sintering is | |also uniform. | |Shrinkage can be large, due to both the fine particle size of the powders and the substantial proportion of polymer binder used. |