The Problem of University Student Debt in the UK Essay

The Problem of University Student Debt in the UK - Essay Example Although student debt cuts across all levels of education, the main issue in this report will be dealing with university student debt. The research paper discusses about the problem of university student debt in UK. It specifically provides an analysis of the current debate on whether the government should or should not pay for all students especially in Higher education. It shows the current implications of the problem especially effects on the UK's education system. It will also concentrate on the specific programs and initiatives that the government is undertaking in order to ensure that there is equity among the diverse student population both domestically and international students. The report has been produced for my lecturer for this module. The actual period taken to produce this is report is two weeks and is approximately (5,139) words long. It has also been presented within the specific formats and styles required by the lecturer and in conformity with the university's academic writing specifications. The report examines the current situation of student debt in UK and if the government driven initiatives will in future solve the problem of university student debt. The report is suitable for all th... t is suitable for all the stakeholders in the education sector, students themselves and the government education officials reviewing the matter at the moment. It will help them understand the implications of the high student debt in their performance, attitudes, future careers etc. 4.0 Methodology/Procedures Owing to the need to have more facts concerning the current situation of student debt and the debate that has been going on for sometime on whether government should pay for all students or not, an extensive research work was done to gain knowledge and gather information/facts of the problem of university student debt. The effect and the impact on both students and quality of education are the main issues that will be looked into. To enable the researcher obtain the required information a variety of resources were used for this purpose; Books- this was one of the important resources that provided information on the history of university student debt in UK and the concerns others have raised on the issue. It also provides government information on their plans for future mitigations. The books were sourced from online book libraries which include; UT electronic libraries, Safari Online Book Centres, EMU, CG1, IPL among others. Journals- journals provided a good source of information for the statistics on the university student debt and previous studies conducted by other people on the subject. The Journals were obtained online from the following; Washington Journal library available online, Hein, Questia, High-wire journals and School library journals among others Websites-this provided information on public opinion and relevant need for the studies and the subject. Most of the websites were related to the education financing in UK and the websites of student

Discuss The Controversy Surrounding The Chapman Brothers Rectified Essay

Discuss The Controversy Surrounding The Chapman Brothers Rectified Works of Francisco Goyas Disasters of War Series - Essay Example The best in Goya came during the period of war in Spain and this shows that wars really bring out the best in men. The controversy that surrounded the rectification of his work by the Goya Brothers was borne out of the love that this critics had for this great artist and his art work. The Chapman brothers have been accused of defacing the etchings they purchased from Goya’s Disasters of War as the Chapman Brothers’ Insult to Injury had some funny faces that made their collections controversial in nature. The Brothers have been accused of intentionally defacing the appearance of Goya’s Disasters of War and some have even said that they used their Insult to Injury to mock Goya’s works. Although the Chapman Brothers have claimed that Francisco Goya was their model, the fact however remains that the rectification of his Disasters of War actually disproves this notion if one considers the fact that they tried to transform the work of their so called ‘mode l’ in order to produce their own work that is different from his work in several ways (Chapman). The Chapman Brothers succeeded in transforming Goya’s work into sheer pornographic Surrealism but it should be underscored that Goya was more into Romanticism. The issue that has been raised by the critics is that the Chapman Brothers bought a set of 83 etchings from Goya’s Disasters of War and vandalised it. The critics have claimed that the Chapman Brothers were aware that this great art work by Goya is one of the most venerated series of prints in existence (Mey, 2007, p.1). The Chapman Brothers have not only made attempts to erase the memories of the artists from the hearts of men, but they have also destroyed and obscured a great artwork, thus attracting lots of controversies to themselves and their rectified art work. Controversy based on Semiotics The Chapman Brothers unscrupulously rectified the works of Francisco Goya’s Disaster of War Series, which G oya himself used to represent the horrors of the war between 1810 and 1820. In the original work of Goya, he used symbols of humans as an allegory to the sufferings of humans during the war and to express his dissatisfaction and horror at the disgusting lunacy of war. In rectifying the works of Francisco Goya’s Disaster of War Series, the Chapman Brothers used cartoon images to represent the sufferings of humans that Goya was trying to depict through his images and the fact that Chapman derailed from the original message of Goya made people to criticize the revised works of the Chapman Brothers. â€Å"Typical in their broad-brush detestation of Enlightenment tradition are Jake and Dinos Chapman, postmodern artists most famous for ‘Insult to Injury’, their vandalized or ‘rectified’ appropriation of Goya’s Disaster of War prints, in which they pasted fiendish clown and puppy heads over every victim’s grimace....† (Broderick, 2005, p.9). The controversy that surrounded the works of the Chapman Brothers was caused by the cartoon images that they superimposed in their work as they used the symbols of puppies or clowns as figures to represent the human sufferings that Goya intended to show people through his Disaster of War

Organizational Culture Model Assignment Example | Topics and Well Written Essays - 500 words

Organizational Culture Model - Assignment Example Due to the company has laid down their model in such a way that they are able to accept change to occur. They deal with the market effect caused by competitors to ensure their superiority in the market. They produce ways to enter the market and ensure they stay in the market strongly and for longer. Second, the customer is highly respected by the company. Complaints from them dealt with the customer service and response given immediately so as to maintain the customer confidence in the market. The company allows the staff to interact with the customer this ensures that they are able to assess the progress and the customer response. The management team then designs solution to deal with the complaints. Third, the company has a policy that encourages teamwork. They create an environment that allows every employee to respect each other and deal with conflict in a way that no one is intimidating the other party. The policy allows people to mingle freely with the other their follow across the board the company policy of teamwork as made them be able to make calculated designs since they are able to meet an agreement due to the togetherness. The company has a set of rules that govern the staff. The rules are to be obeyed and followed them. Failure to follow it usually causes one to be punished. The image of the company is well protected in that this ethic of conduct was drafted to keep the workplace a professional area. All employees are able to read them and abide by them. Lastly, the company has invested in the empowerment of its own staff. They include them in design making. They have created a culture in which the staff feel part and parcel of the company. This allows the management to consider most information to be all members’ information. They are feed with very detailing concerning the company.  

Poverty, the Never-ending Disease Essay Example for Free

Poverty, the Never-ending Disease Essay Poverty is a lack of goods and services needed to maintain a minimal adequate standard of living. The definition of the term adequate varies, however, with the general standard of living in a society and with public attitudes toward deprivation. No university accepted the definition of basic needs exists because poverty is a relative concept. In poorer countries it means living at the brink of subsistence, while in our country few improvised families confront starvation, although many suffer from undernourishment. Not everyone is born into a life of the rich and glamorous. Those who are fortunate enough know that they are very lucky to be in their position. Others however are totally in different situations. They need to fend for themselves and having meal is something which comes only once a day. Malnutrition is the obvious result of not consuming the right amount of food. This will lead to outbreaks of diseases but in poverty stricken countries there are no hospitals to cure this. Lacking infrastructure means lacking educational rights. People who are living in poverty cannot afford to send their children to school so this will mean an unclear future for their children hence the undernourishment. Furthermore, living in crowded areas, this has a tendency to increase the chances of disease as people are drinking from unsafe sources of water. People around the world are not aware of how immense this issue is and sometimes hesitant to believe the scale that it has risen to. Without understanding the people living at a disadvantage from the rest, there is no cure for the problem. Poverty is not only the problem of the poor, but the rich as well. If the wealthy becomes too concentrated and there are too many people at the low end who cant contribute to the cost of society (taxes t o maintain infrastructure for instance) then more of that burden must fall to the wealthy. The wealthy that derive their wealth by selling goods and services to a mass market will be affected if the market dries up because too many individuals are too poor to be able to buy the goods/services. With hints of the invisible hand playing a role in this, it’s possible that the economy might not adjust to the buyers and sellers. People suffering from poverty may become enraged at the disparity between themselves and the wealthy and may express that rage through a violent revolution and redistribution of wealth. Some wealthy individuals may feel concern about such a disparity and choose to give some of their wealth to better the condition of the poor or to help the poor find a way to prosperity. Poverty in the United States has long been a social, political, and human rights issue. Few people would say that it is not our moral duty, as social human beings to take care of those less fortunate than ourselves, to the best of our ability. These types of people have what is called a â€Å"libertarian†. There is really no specific definition of â€Å"libertarian†, but it is associates justice with liberty. In relation to the matter at hand, specifically poverty in America, libertarians are against taxing the affluent or forcing people to aid the starving and poor. One of the most influential libertarians of our time is Professor Robert Nozik. His theory of justice begins with the principle that all people have rights, which require that we refrain from interfering with others. Other than this we have no obligation to do anything positive for anyone else, and likewise, they have no obligation towards us. These rights are natural or inalienable because all humans have them and they do not come from any social or political institutions. These rights forbid us from interfering with a person’s liberty even if it would promote some general good, or prevent another’s rights from being violated. Overall, the general idea is that people have the liberty to live a life free from intervention of others, and can lead their life however they so choose. In addition, he says that if a person acquired their fortune or possessions without harming, defrauding, or violating the rights of any others, then it is morally permissible to use those things however one wishes. This includes wasting, willing, or endowing the possessions to someone else. Even though many people are dying from starvation and malnutrition, Nozik’s theory of justice states that one has no obligation to help those people. His theory is summarized as follows: 1. A person who acquires a holding in accordance with the principle of justice in acquisition is entitled to that holding. 2. A person who acquires a holding in accordance with the principle of justice in transfer, from someone else entitled to the holding, is entitled to the holding. 3. No one is entitled to a holding except by (repeated) applications of 1 and 2. Relating to poverty, libertarians feel that no matter how the actual distribution of economic holdings may look, if all involved are entitled to the holdings they possess, then the distribution is just. Although Nozik’s theory concentrates on the just of distribution, Rawl’s theory of the difference principle can be thought of as the similar concept. The main moral motivation for the Difference Principle is similar to that for strict equality. The overwhelming economic opinion though is that in the foreseeable future the possibility of earning greater income will bring forth greater productive effort. This will increase the total wealth of the economy and, under the Difference Principle, the wealth of the least advantaged (the poor). The inequalities consistent with the Difference Principle are only permitted so long as they do not compromise the fair value of the political liberties. So, for instance, very large wealth differentials may make it virtually impossible for poor people to be elected to political office or to have their political views represented. These inequalities of wealth, even if they increase the material position of the least advantaged group, may need to be reduced in order for the first principle to be implemented. The difference principle may be the solution to poverty in the near future, but sadly the idea of strict equality between individuals will be a difficult concept for people to grasp. Capitalism is a system designed to produce for private profit, not for public need. We have gotten as far as we have due to decision-making of corporate boardrooms and placing them under the democratic control of the majority that the economy can provide for our needs. To do that, we need to bring into public ownership the largest 500 corporations and financial institutions. If the assets of these giant companies were under our democratic control, then investment and resources could be democratically controlled by working-class people. Resources would be available to address our most pressing social problems and allocated to areas of most need. To achieve this means breaking from giving any support to the two big-business political parties the Republicans and Democrats. They are both fully implicated in creating the present mess we are in. We need to build a new political party to represent our interests as workers, the poor and young people, and which points a finger at the real villains, the super-rich and the capitalist system.

Operational Requirements And Service Conditions Of Piston Engineering Essay

Operational Requirements And Service Conditions Of Piston Engineering Essay ABSTRACT There is an extent in changing the trend of the material by its properties and its characteristic. The majority of the materials completely depend on the application of the material in the component and its versatility. The components by material vary from each other by its properties. The materials have the tendency to change its manufacturing process by its character. A component can be manufactured by using various materials depending according to the application and its life. In this paper we discussed about the manufacturing process of the components like piston, connecting rod and the crank shaft. The alternative methodologies and usage of alternative materials are also explained by using CES chart with its advantages. INTRODUCTION Selecting the appropriate material is an integral part of the successful implementation of an engineers design. A design engineers ability to objectively quantify the combined marketing, technical and manufacturing requirements as they apply to the material selection is critical to the actual as well as the perceived success of the product. This paper contains a deep knowledge about the selection of the material and its manufacturing procedure with justification. CHAPTER 1 GENERAL COMPONENT DETAILS 1.1 PISTON The piston is the most essential component of the engine which actually transfer the energy output from the combustion chamber to the crankshaft through connecting rod. This is a pressure-tight cylindrical plunger which is subjected to the expanding gas pressure. Basically, piston structural components are head, skirt, gudgeon pin, grooves and lands. 1.1.1 OPERATIONAL REQUIREMENTS AND SERVICE CONDITIONS OF PISTON Hence in order to transmit this high power output the piston must be designed lightly and must be robust. The piston must be of higher strength material that can with stand the high pressure that is been generated due to the burning of air-fuel mixture within the cylinder. Piston must be fitted properly to control the expansion due to temperature, without which the piston will fit loosely when in cold and they bind themselves when it gets warmed. 1.1.2 FUNCTIONS OF PISTON Transmit energy from combustion unit to piston pin, Serve as a carrier for the piston ring which seals the compression in the cylinder, Act as a guide for upper end of the connecting rod, Withstand high temperature expansion Despite the heat energy to the coolant. piston.gif Fig(1) Piston Assembly Conditions of piston at normally high speed, Piston moves from the top to bottom of the cylinder and vice versa with a acceleration of speed of around 50mph at midpoint and decelerates. The piston is subjected to pressure of about 6.8MPA. The piston is subjected to temperature of about 315 °C.[1] 1.1.3 DESIRABLE MATERIAL CHARACTERISTICS The Piston materials must meet the following conditions, [2] Low thermal expansions for arresting the hot gases. High thermal conductivity for releasing heat from piston head. High strength to mass ratio (light weight) for transmitting high power output. High fatigue strength for increasing the material strength. Good resistance to surface abrasion. To reduce skirt and ring groove wear. 1.2 CONNECTING ROD Connecting rod is a part of the engine which connects the piston to the crankshaft. This connecting rod converts the linear motion of the piston to rotating motion to the crankshaft. 1.2.1 OPERATIONAL REQUIREMENTS AND SERVICE CONDITIONS [] Connecting rods should be made as long as possible to reduce the oblique angle by the cylinder axis. Both tensile and compressive stresses are produced due to piston reciprocating-inertia loads. In order to evade scuffing proper lubrication is needed. Lubrication of the small end by a hole drilled along the shank should be so arranged that the hole intersects the big end bore circumferentially. To prevent buckling the rod shank is made in an H section, i.e., with a central web and two end flanges. Intense heat is generated at high rotational speed, so large bearing area is required to make the rod wear well. They should be checked for the correct length, weight distribution, straightness and freedom from twist. 1.2.2 FUNCTIONS OF CONNECTING ROD As the word is self explanatory, the connecting rod connects the piston and the crankshaft. The connecting rod continuously transmits energy from the combustion chamber to the crank shaft. It actually converts the reciprocating motion of the piston to the rotary motion of the crankshaft. These dynamic motions of the connecting rod makes it as light as possible whilst having a rigid section. 14900_19847.jpg 1.2.3 DESIRABLES MATERIAL CONDITIONS Must be strong to remain rigid under loading and light enough to reduce the inertia forces. Material must have good elastic modulus. It must have high fatigue strength in order to avoid failure due to high cycle fatigue. Heat capacity of the connecting rod must be high. Must withstand buckling stress due to large compressive loads. Must be of low density to avoid bearing failure. 1.3 CRANKSHAFT Crankshaft is the central link-up for the power produced by each cylinder in the engine. This crankshaft is one of the heavier part of the engine which is to be made strong to withstand the load from the con-rod. 1.3.1 OPERATIONAL REQUIREMENTS AND SERVICE CONDITIONS Fillet areas locations are to be verified since both torsional and bending loads are experienced during its service life. Counterbalancing of weight is to be considered in order to counteract the centrifugal forces created by crankpin. The projected areas of the big-end and main-end journals must be adequate to withstand maximum cylinder pressure. After grounding should have a surface finish of 0.5 µm to minimize bearing wear. Crankshaft must have the capacity to absorb the thrust loads from clutches or torque converter. 1.3.2 FUNCTIONS It transmits power from combustion chamber to the flywheel through piston, piston rings and connecting rod. It harness and phase the individual cylinders power impulses transmitted through the mechanism of the connecting rod which converts the reciprocating motion of the piston to rotary motion at crankshaft. It changes the linear displacement due to sudden shock caused by the combustion chamber into smooth rotary motion which is the input to many devices. Crankshaft rotates in the cylinder in the cylinder block of the main bearing which supports the crankshaft which reduces the excessive wear. http://www.motorera.com/dictionary/pics/c/crankshaft.gif 1.3.3 DESIRABLES MATERIAL CHARACTERISTICS Material nominal stress must not exceed 20% of tensile strength in bending and 15% in torsion. Must have the capacity to withstand large force from gas combustion. Must have high heat withstanding capacity. Must have low thermal expansion. Must have high adequate strength, toughness, hardness, and high fatigue strength. CHAPTER 2-MATERIAL SELECTION 2.1 MATERIAL SELECTION FOR PISTON[hh] Material selection process is an integral part of the overall product development process and must be considered in the early phases of the product definition. The material chosen for manufacturing the product is based on the following consideration, Mass consideration Strength and wear consideration Heat-conduction consideration Expansion consideration Based on the above considerations the aluminium alloys satisfies all the factors comparing to cast iron and steel. Mass consideration: Since the pistons reciprocating force is high at high speed, it is necessary to turn to light material instead of cast iron and steel. It has a relative density of 2.6 when compared with 7.8 for cast iron. Strength and wear consideration: Since pure aluminium has low tensile strength of 92 to124 N/mm2 and fall of to 31N/mm2 at 300 °C, it is always alloyed with copper or silicon for piston materials which improves the strength to mass ratio. At high level of silicon, the alloy exhibits excellent surface hardness, wear resistance properties and excellent dimensional stability. Heat-conduction consideration: The better heat dissipation of aluminium-alloy pistons compared to cast-iron pistons greatly reduces the maximum piston-crown operating temperature of 250C 300C for allou pistons and 400 to 500C for cast iron. Expansion Consideration: The thermal expansion is less for Al-Si alloy which has a thermal expansin of 0.000 021 and 0.000 017 per  °C for 12% Si alloy and 22% Si alloy. Fig() CES chart 2.1.1 SURFACE CONSIDERATON: Due to high speed reciprocation of the piston there may be so many losses or issues that must be considered. In that the frictional losses in piston assembly are majorly due to generation of heat. Subsequent raise in temperature can have this effect in the operation. In order to overcome this problem, proper material with good thermal conductivity is chosen. 2.2 MATERIAL SELECTON FOR CON-ROD The connecting rods are crucial and highly stressed component of the automotive engine subjected to alternative tensile and compressive stresses. Hence the material must be chosen based on the following conditions; Good elastic modulus, High fatigue strength, Low density to avoid bearing failure and High heat capacity. Based on the following conditions microalloyed steel is chosen which meets all the requirements mentioned above. This steel has a hardness level of 20-30 HRC. Small microalloying additions of vanadium and niobium are used to increase the strength of carbon steel plates. 1.1%Mn-0.5%Cr is the best combination to obtain thee high fatigue strength. Lowering the carbon content down to 0.33% and increasing the vanadium content to control the hardness gives toughness which improves the fatigue strength of free machining grades with S and Pb. The finally obtained chemical composition is 0.33%C-1.05%Mn-0.5%Cr-0.12%V-.055%S-0.20%Pb-Ca which has fatigue strength of 26% higher than a conventional microalloyed forging steel. As for connecting rod, application of light metal like titanium alloys and aluminium alloys are been tested, due to high cost in light metal the connecting rod are made of microalloyed steel. This structure contains ferrictic-pearlitic-bainit. Fig() CES chart 2.2.1 SURFACE CONSIDERATION The connecting rod is one of the highly stress concentrated part of the automotive engine. It is known that in the four cycle engines the connecting-rod small end is particularly stressed when the con-rod is at top dead centre at the beginning of the induction stroke, since the small end is ovalized by the tensile inertial forces exerted by the mass of the piston assembly. During both the stroke condition (expansion and compression) gudgeon pin pushes the small end along the lower end of the arc, by which the compression load directly acts on the con-rod without considerably stressing the eye. The eye is therefore subjected to repeated stresses, whereas the con-rod shank stress are reversed.(10) 2.3 MATERIAL SELECTION FOR CRANKSHAFT (hh) Crankshaft are from materials which can be readily shaped, machined and heat-treated and which have desirable mechanical properties such as adequate strength, toughness, hardness and high fatigue strength and of course , low cost. The highest quality steels are usually specified for satisfying the constraints given. Metals with optimum combination of bending and the stiffness are identified by creating a charts in CES by using performance indices in axes. From the figure it is clear that the low carbon steel, high carbon steel, low alloy steel and medium carbon steel are satisfying the given constraints. Low alloy steel with chromium-molybdenum is used for crankshaft. This forging steel is suitable for medium to heavy-duty petrol and diesel-engine crankshafts. It presents no difficulty in hot working and afterwards can be easily machined to size. The alloying composition is 0.4% carbon, 1.2% chromium and 0.3% molybdenum. 2.3.1 SURFACE CONSIDERATIONS Since crankshaft is the most highly strained part of the engine with high load acting on it the following factors must be considered. Pitting failure can occur in the crank-pin Due to lack of surface integrity lack of control over stress and temperature. CHAPTER 3 MANUFACTURING PROCESS 3.1 MANUFACTURING PROCESS FOR PISTON[SS] Based on the material selected as aluminium alloys for piston, the manufacturing process is carried-out through casting because of its capability to produce near-net shaped parts at the required production rate. Hence the process selected for this component is the Gravity die casting. 3.1.1 GRAVITY DIE CASTING The pistons are produced from high-silicon alloys, such as 413.0 aluminium alloy. This alloy has high fluidity and can create high-definition surfaces through permanent mould casting; it also has high resistance to corrosion, good weldability, and low specific gravity. The universal acceptance of aluminium pistons for internal combustion engine applications is due to mainly to their light weight and high thermal conductivity.[ss] This type of casting is suitable for high volume production. The main advantages are the dimensional accuracy and surface finish. Castings ranging from few grams to 100kgs of aluminium alloy could be casted. This process could achieve higher mechanical properties than other casting by heat treatment. Since silicon has got good properties like, low shrinkage and imparting high fluidity which results in good casting. The maximum amount of silicon in cast alloy are in range of 22%-24%.(11) Manufacturing route: [ss] The h13 tool-steel mould is preheated to 200 °C to 450 °C, depending on the cast alloy and part size. Initially, the preheat is achieved with a hand-held torch, the mould reaches a steady-state temperature. Molten aluminium is heated to between 100 °C-200 °C above its liquidus temperature as shown below. Once the molten shot is in place the piston drives the mould in its place. Because of high thermal conductivity of the mould material, heat extraction from the molten metal is rapid and the metal solidifies in small channels before filling the mould completely. [9] 3.1.2 MICROSTRUCTURAL CHANGES Silicon has a diamond crystal structure and is consequently very brittle. These silicon structure damage the mechanical properties and nucleates on aluminium phosphide particles that is present in the melt as impurities. Further addition of sodium to the melt getters the phosphorous, which thereby increases the difficulty of sodium nucleation. Solidification is suppressed to lower temperature where the nucleation rate is large. This leads to remarkable refinement of microstructure. [9] Aluminium Silicon [9] From the figure above the dark feature is a shrinkage pore caused by a casting defect. This figure shows the coarse silicon plates in an aluminium matrix. 3.2 MANUFACTURING PROCESS Microalloyed connecting-rod is manufactured by a simplified thermomechanical treatment like controlled cooling following hot forging. Through these processes desired properties could be obtained without quenching and tempering treatments. Hence powder forging was selected which would conveniently satisfy the manufacturing process for the selected material and component. 3.2.1 POWDER FORGING Powder forging rods are manufactured by combining metal powders into a pre-form that is sintered and reheated to forging temperature. Then it is completely forged to its final shape and machined to its final dimensions. This mixed powder is compacted at room temperature and high pressure upto to 200 to 400MPa. At the end of the process the powdered material acquires a density of 70 to 85%. This process has resulted in fully dense shape part which makes it suitable for high performance applications where high durability and strength are required. The detailed manufacturing route of this PF process is shown below: [12] The advantages of using PF process are, Good dimensional accuracy Minimum scattering of weight Energy saving [12] 3.2.2 MICROSTRUCTURE [13] [13pdf] From the photograph of the microstructure of the connecting-rod material it is clear that the component contains pearlite and ferrite materials in composition. The above picture clearly indicates that in the powder metal connecting rods oxides are removed from the material surface by shot peening but the oxides are entrapped and remain below the surface causing the crack to originate below the surface . 3.3 MANUFACTURING PROCESS 3.3.1 FORGING [ss] The material selected for the crankshaft is forged steel which has a desirable mechanical properties such as adequate strength, toughness, hardness, and high fatigue strength. Hence the suitable manufacturing process for this steel is forging. Forging is a basic process in which the work-piece is shaped by compressive forces applied through various dies and tooling. For this forging process the dimensional tolerance range from  ±0.5 to  ±1% of the forging dimensions. At higher temperatures of about 700 °C dynamic forging recrystallisation occurs which increases the stress and strain deformation of the metal to make it hard. Manufacturing route: Prepare a slug or billet Heat the work-piece in the suitable furnace For hot forging, preheat and lubricate the dies Forge the billet in appropriate dies and in the proper sequence Clean the forging and check its dimensions Perform additional operations such as heat treatments and straightening Inspect for defects In the hot forging process to form a metal billet two or more dies are brought together to each other at a suitable room temperature in a shape of the die impression. This process follows two basic requirements, The strength of the material must be low so that the die pressure can be kept within the limits. The material should be capable of deforming without failure and should allow required amount of deformation. The flow of metal and die filling are mainly determined by (i) flow stress and cooling ability (ii) friction and cooling effects at the material interface. In this process, definite amount of heat is received by all the parts after machining in heat treatment process. This is mainly carried-out to improve fatigue and wear properties. High quality parts with moderate cost can be made by this process. Thus this process offers high strength to weight ratio, toughness and resistance to impact and fatigue to the material which is considered in the performance of the crank shaft. [14] 3.3.2 MICROSTRUCTURE Heating above recrystallisation temperature causes recrystallisation that removes the microstructure deformed and generated recrystallised grains. After eutectoid-carburizing martensite transformation takes place and a black portion near the surface is formed consisting of fine grains of ferrite and carbide. On quenching from the austentite (ÃŽ ³) phase martensite is formed. This transformation is a diffusion-less shear transformation . Martensite is too brittle in plain carbon steel for practical applications and is subsequently tempered to restore some toughness. CHAPTER 4 ALTERNATE MATERIAL 4.1 ALTERNATE MATERIAL FOR PISTON[hh] Cast iron refers to the family of ferrous alloys composed of iron, carbon ranging from 2.11% to about 4.5% and silicon of about 3.5%. They are classified by their structure ferritic, pearlitic, quenched and tempered or austempered. The equilibrium phase diagram relevant to cast iron is shown below where right boundary is 100%C. The eutectic temperature is 1154 °C and thus cast irons are completely liquid at temperatures lower than those required for liquid steels. One of the major disadvantage of the aluminium as the base metal of the piston is that it has high co-efficient of linear expansion in the range of 0.0000221per °C, compared with 0.0000117per °C of cast iron. Aluminium has twice the expansion rate of cast iron. Cementite is metastable (not completely stable) which has a tremendously low decomposition rate. However it can be made decomposed into alpha-ferrite and graphite. The graphitization can be controlled, promoted and accelerated by adding silicon, controlling the rate of cooling and modifying the composition.[ss] [15] 1.4.1 LIMITATIONS Relative density is high of about 7.8 When in tension, the presence of graphite acts as a stress riser weakens the material. Strength properties of the cast iron are significantly affected by the shape and size of graphite. Higher material and manufacturing cost. The major disadvantage is the shrinkage. 1.4.2 POTENTIAL BENEFITS Presence of graphite in cast iron improves wear-resistance as it acts as a lubricant. High carbon content-degradation of ductility and fracture toughness. Good corrosion-resistance. Easy machinability Wide range of composition and microstructures-easy weldability. 4.2 ALTERNATE MATERIAL FOR CON-ROD The alternate material chosen for connecting rod is aluminium alloyed material as it is light in weight and provides long service life to the part. The aluminium alloys are high strength-to-weight ratio, resistance to corrosion by many chemicals, high conductivity and ease of formability. The material composition of aluminium is 7.6 to 8.4% Zn,1.8-2.3%Mg, 2-2.6%Cu, 0.08-0.25%Zr, 0.10%Si, 0.15%Fe, 0.05%Mn, 0.04%Cr and 0.06%Ti. When compared to othe alloys it convinces the constrains like low thermal expansion, wear-resistant, high fatigue strength and buckling. Majorly this material is chosen based on the following consideration: Mass consideration Strength and wear consideration Expansion consideration Heat-conduction consideration http://www.streetperformance.com/ART/PRODUCTS/100687/14012-8.jpg[19] 2.4.1 LIMITATIONS It is more expensive than cast iron. Low dimensional accuracy and poor surface finish. Solidification is very slow. Occurrence of fracture in short transverse direction. Expansion rate is high when compared to cast iron with oure aluminium. 2.4.2 POTENTIAL BENEFITS Aluminium alloys can be easily machined and welded and formed. High dimensional accuracy with long service life. High yield strength in both tensile and compression. Aluminium is much better conductor of heat than cast iron. Aluminium alloys provide improved resistance to abrasion and produce strength over temperature range. Improves the performances of the piston and thus the engine. 4.3 ALTERNATE MATERIAL FOR CRANKSHAFT As the crankshaft is the heavier moving part in the automotive engine, the material selected for this part has to be strong and light. Titanium alloys having high strength with reduced weight is used for crankshaft until and unless cost is not considered, as this material is very expensive. http://amt-advanced-materials-technology.com/s/cc_images/cache_867254901.jpg[17] 4.3.1 POTENTIAL BENEFITS OF TITANIUM ALLOYS Titanium has high melting point of about1678 °C which specifies strong creep and strength above wide temperature range. The density is about 55% of steel with comparable strength. Ti alloys exists in two allotropic forms ÃŽ ± and ÃŽ ² Presence of thin oxide surface film-resistance over atmospher and sea environments including chlorine and organic chemicals. Reacts rapidly with oxygen, nitrogen and constituents in cutting tools at high temperature. 4.3.2 LIMITATIONS Embrittlement occurs during fabrication because of susceptibility of hydrogen, oxygen and nitrogen. Forging with titanium alloys is expensive but it increases the strength of the material. Ti alloys has a tendency to madden when tightening with connecting rod using bolt. Titanium is more difficult to machine due its reactive nature. Niobium Titanium[16] CHAPTER 5 ALTERNATE MANUFACTURING PROCESS 5.1 ALTERNATE MANUFACTURING PROCESS FOR PISTON 5.1.1 SAND CASTING Sand casting is a one of the most feasible manufacturing process where the unit production is comparatively less. In this process a mixture of sand and clay is compacted around the pattern in which the pattern retains the shape of the original component to be produced. Then the pattern is removed in order have the cavity in the shape of the pattern. Generally low cost wooden patterns with gateways and runner are used. The molten metal is poured into the gateway by which it runs through the runner and fills the cavity and forms the exact shape of the cavity. Actually this whole system is housed in a box called flask. After which the molten metal allowed to solidify by cooling it. As the molten metal is solidified the sand pattern is broken and final work is done to obtain the finished component. The figure below shows the manufacturing process of the sand casting in detail. http://openlearn.open.ac.uk/file.php/1689/T173_2_020i.jpg Fig(8.1) Sand Casting Process [18] 5.1.2ADVANTAGES Low tooling and equipment cost Component with any complicated shape can be produced Relatively cheap process Possibly components can be produced in large quantity. 5.1.3 DISADVANTAGES High tolerance ratio is required Labour cost is high. 5.2 ALTERNATE MANUFACTURING PROCESS FOR CON-ROD 5.2.1 SQUEEZE DIE CASTING Squeeze die casting or liquid metal casting involves the process of solidification of molten metal under high pressure. The machinery includes a die, punch and ejector-pin. Under the pressure applied by the punch keeps the entrapped gases in solution and the rapid heat transfer takes place at the die-metal contact which results in fine microstructure with good mechanical properties.[ss] Elimination of shrinkage and gas porosity happens because of precise metal metering, quiescent die filling and high pressure. 5.2.2 ADVANTAGES Precise dimension, Excellent surface finish, Fully shaped component is obtained Complex part can be made to near-shape. 5.2.3 DISADVANTAGES High initial cost Limitation of high fluidity metals[20] 5.3 ALTERNATE MANUFACTURING PROCESS FOR CRANKSHAFT 5.3.1 FORGING In forging operations the metal is squeezed to shape by die in which the metal is subjected to large plastic deformation. These metals are placed in-between closed dies under high temperature and pressure which results in succession of the final shape. http://www.forcast.ca/images/00436_faq1.gif[21] Forgings generally are subjected to additional finishing operations, such as heat treating to modify properties and machining to obtain accurate final dimensions and surface finish. 5.3.2 ADVANTAGES Good utilizations of materials Good dimensional accuracy High production rate Good reproducibility Low die costs 5.3.3 DISADVANTAGES Initial cost is high Not economical for small quantities Machining often necessaries

Spiritual Views in Emersons The Poet Essay -- Emerson Poet Essays

Spiritual Views in Emerson's The Poet Transcendental, and therefore pantheist, views run fluidly throughout Emerson's texts, especially as he attempts to define his image of the perfect poet in his essay, The Poet. He continually uses religious terms to express his feelings, but warps these terms to fit his own unique spirituality. This technique somewhat helps to define his specific religious views which mirror the view of transcendentalism and pantheism. Emerson's ideal poet is a pantheist who can express the symbols of the world through words. Emerson begins the essay by explaining that many people are taught "rules and particulars" to decide what is good art, and therefore deem themselves worthy critics although they have no feeling for art in their soul. He states that intellectual men, perhaps the cold Unitarians from which he broke away, theologians, and modern 'poets' do not acknowledge a relationship between the physical world and the mind and then praises the "highest minds" (such as Swedenborg, Plato and Heraclitus) who instead examine everything to its fullest manifold meaning. I find it interesting that in the lines "We were put into our bodies, as fire is put into a pan" and we are "but children of the fire, made of it, and only the same divinity transmuted, and at two or three removes, when we know least about it" that Emerson compares human souls to fire. Heraclitus believed that fire was the essence of everything, similar to Anaximander's concept of 'apeiron.' Emerson here shows his pantheistic view that we have all come from the same divine 'stuff,' and being "two or three removes" away from its Godly source, we are unable on a basic level to fully comprehend it. This is also remin... ...his ideal poet, and in doing shows that he feels the "poet is representative," both in using words as representative symbols and as a representative of life itself. The ideal poet becomes a portrait of a man incredibly close to nature, and therefore close to Emerson's view of God. The poet is a spiritual man who transcends our man made reality through introspection into the abyss of 'God's Reality,' bringing back with him carefully sculpted words for man-kind's consumption in an effort to help man-kind better understand life and the world in which it is lived. Works Cited Emerson, Ralph Waldo. "The Poet." The Heath Anthology of American Literature, Vol. 1. Third Ed. Paul Lauter, et al., eds. New York: Houghton Mifflin Company, 1998. 1646-1661. The Selected Writings of Ralph Waldo Emerson. Ed. Brooks Atkinson. New York: Modern Library, 1950. Spiritual Views in Emerson's The Poet Essay -- Emerson Poet Essays Spiritual Views in Emerson's The Poet Transcendental, and therefore pantheist, views run fluidly throughout Emerson's texts, especially as he attempts to define his image of the perfect poet in his essay, The Poet. He continually uses religious terms to express his feelings, but warps these terms to fit his own unique spirituality. This technique somewhat helps to define his specific religious views which mirror the view of transcendentalism and pantheism. Emerson's ideal poet is a pantheist who can express the symbols of the world through words. Emerson begins the essay by explaining that many people are taught "rules and particulars" to decide what is good art, and therefore deem themselves worthy critics although they have no feeling for art in their soul. He states that intellectual men, perhaps the cold Unitarians from which he broke away, theologians, and modern 'poets' do not acknowledge a relationship between the physical world and the mind and then praises the "highest minds" (such as Swedenborg, Plato and Heraclitus) who instead examine everything to its fullest manifold meaning. I find it interesting that in the lines "We were put into our bodies, as fire is put into a pan" and we are "but children of the fire, made of it, and only the same divinity transmuted, and at two or three removes, when we know least about it" that Emerson compares human souls to fire. Heraclitus believed that fire was the essence of everything, similar to Anaximander's concept of 'apeiron.' Emerson here shows his pantheistic view that we have all come from the same divine 'stuff,' and being "two or three removes" away from its Godly source, we are unable on a basic level to fully comprehend it. This is also remin... ...his ideal poet, and in doing shows that he feels the "poet is representative," both in using words as representative symbols and as a representative of life itself. The ideal poet becomes a portrait of a man incredibly close to nature, and therefore close to Emerson's view of God. The poet is a spiritual man who transcends our man made reality through introspection into the abyss of 'God's Reality,' bringing back with him carefully sculpted words for man-kind's consumption in an effort to help man-kind better understand life and the world in which it is lived. Works Cited Emerson, Ralph Waldo. "The Poet." The Heath Anthology of American Literature, Vol. 1. Third Ed. Paul Lauter, et al., eds. New York: Houghton Mifflin Company, 1998. 1646-1661. The Selected Writings of Ralph Waldo Emerson. Ed. Brooks Atkinson. New York: Modern Library, 1950.

Modern Western Thought :: essays research papers

Modern Western though has been shaped by emphasis on scientific thinking and reasoning from the time of Copernicus, Galileo and Newton. The scientific revolution gave birth to a new era of thought, in which observations were made to support an idea. This involved what man could prove through sense, not religion or superstition. Notable ancient Greek historians, philosophers and scientists, such as Thucydides, Socrates, Aristotle, and Hippocrates, laid down the seeds of modern Western thought.   Ã‚  Ã‚  Ã‚  Ã‚  An ancient Greek writer who demonstrated modern scientific objectivity was Thucydides. Over time, this type of scientific objectivity has become a valuable tool of modern Western thought. The vividness and detail of Thucydides’ description of the effects of the plague is striking. A doctor today would be very impressed by the accuracy and detailed description of the plague: â€Å"Externally the body was not very hot to the touch, nor was there any pallor: the skin was rather reddish and livid, breaking out into small pustules and ulcers.† This precise description of the plague would be comparable to any description written today. The scientific objectivity demonstrated by the ancient Greeks had a direct influence on our medical, and non-medical, description today.   Ã‚  Ã‚  Ã‚  Ã‚  Many ancient Greeks such as Socrates used logic, another invaluable tool of modern Western thought. Socrates, by asking simple questions, was able to draw answers from people that supported his argument. By thinking a problem through, step-by-step, Socrates was able to formulate answers to a problem or question. This laid down the foundation for modern logic. â€Å"Not at all, my dear Agathon. It is truth that you find impossible to withstand; there is never the slightest difficulty in withstanding Socrates.† This shows that Socrates merely saw himself as a guide to logic.   Ã‚  Ã‚  Ã‚  Ã‚  Aristotle, one of the very first scientists, used evidence to support his claims. Today, any argument made must be supported by evidence. Any argument not supported by evidence is not accepted as fact. Aristotle’s use of evidence made his arguments strong and convincing, even if he was quite wrong. When Aristotle writes â€Å"Again, if the earth as a whole is capable of floating upon water, that must obviously be the case with any part of it. But observation shows that this is not the case. Any piece of earth goes to the bottom, the quicker the larger it is† he is able to prove his point by the use of evidence. The method in which Aristotle supported his arguments is constantly used today as it shows that the point one is arguing is true. Modern Western Thought :: essays research papers Modern Western though has been shaped by emphasis on scientific thinking and reasoning from the time of Copernicus, Galileo and Newton. The scientific revolution gave birth to a new era of thought, in which observations were made to support an idea. This involved what man could prove through sense, not religion or superstition. Notable ancient Greek historians, philosophers and scientists, such as Thucydides, Socrates, Aristotle, and Hippocrates, laid down the seeds of modern Western thought.   Ã‚  Ã‚  Ã‚  Ã‚  An ancient Greek writer who demonstrated modern scientific objectivity was Thucydides. Over time, this type of scientific objectivity has become a valuable tool of modern Western thought. The vividness and detail of Thucydides’ description of the effects of the plague is striking. A doctor today would be very impressed by the accuracy and detailed description of the plague: â€Å"Externally the body was not very hot to the touch, nor was there any pallor: the skin was rather reddish and livid, breaking out into small pustules and ulcers.† This precise description of the plague would be comparable to any description written today. The scientific objectivity demonstrated by the ancient Greeks had a direct influence on our medical, and non-medical, description today.   Ã‚  Ã‚  Ã‚  Ã‚  Many ancient Greeks such as Socrates used logic, another invaluable tool of modern Western thought. Socrates, by asking simple questions, was able to draw answers from people that supported his argument. By thinking a problem through, step-by-step, Socrates was able to formulate answers to a problem or question. This laid down the foundation for modern logic. â€Å"Not at all, my dear Agathon. It is truth that you find impossible to withstand; there is never the slightest difficulty in withstanding Socrates.† This shows that Socrates merely saw himself as a guide to logic.   Ã‚  Ã‚  Ã‚  Ã‚  Aristotle, one of the very first scientists, used evidence to support his claims. Today, any argument made must be supported by evidence. Any argument not supported by evidence is not accepted as fact. Aristotle’s use of evidence made his arguments strong and convincing, even if he was quite wrong. When Aristotle writes â€Å"Again, if the earth as a whole is capable of floating upon water, that must obviously be the case with any part of it. But observation shows that this is not the case. Any piece of earth goes to the bottom, the quicker the larger it is† he is able to prove his point by the use of evidence. The method in which Aristotle supported his arguments is constantly used today as it shows that the point one is arguing is true.