Hills like White Elephants Coursework Example | Topics and Well Written Essays - 250 words

Hills like White Elephants - Coursework Example The setting is in Spain, and the fact that the man speaks Spanish puts him in a decidedly advantageous position compared to the girl. Jig has to rely on the American while they are in Spain; or, it is likely, she had to rely on him in all the places they visited. Their relationship is one of imbalance and inequality. Jig is dependent on the American, and obviously she feels compelled to abide by his decision to abort their child, even though the man places the moral responsibility upon the woman (he pushes insistently on the operation being simple, but purports to go through the operation only if she wished). Hemingway meant for the setting to contribute to the central theme, which is Jig’s dilemma of undergoing the abortion. The symbolism is clear that the setting contrasted the barrenness of â€Å"this side† with the fruitfulness of â€Å"the other side.† The station is midway between the two. These are evident in the lines: â€Å"Across, on the other side, were fields of grain and trees along the banks of the Ebro. Far away, beyond the river, were mountains. The shadow of a cloud moved across the field of grain and she saw the river through the trees.† The setting is a symbolism for Jig being midway in deciding whether to have the abortion (barrenness) or having her child (fruitfulness). The shadow of the cloud moving across the field of grain shows that she may have considered that deciding to keep her child has become a dim prospect, in the face of the American’s insistence that the abortion is â€Å"an awfully simple operation.† The hills appearing like white elephants symbolizes the child they would have, which is now far off in the distance. The white elephant in Thailand is both blessing and curse – blessing because it is rare and considered valuable, curse because it may not be put to work and thus is fed and cared for

Criminal Justice and Deviance Essay Example | Topics and Well Written Essays - 1500 words

Criminal Justice and Deviance - Essay Example The premise of this is a statement given by Congressman Hutchinson, stating that â€Å"Having lost its social stigma, bankruptcy ‘convenience’ filings have become a tool to avoid financial obligations rather than a measure of last resort.† (quoted in Thorne and Anderson, 2006, 147). This was also supported by Efrat (2005: 481), who attributed the lessening of stigma to the fact that â€Å"American society may have developed a more positive attitude towards the individual that was manifested by less anger and more sympathy with the plight of the individual.† Thus, if the theory is to be followed, there was no more shame to be had because of the acceptance of those who defaulted from debts. The findings of Thorne and Anderson, however, appear to suggest otherwise. In fact, instead of viewing personal bankruptcy as merely a product of rational economic choice and a strategy to stop payment of mounting debt, those who file for bankruptcy find themselves confron ting stigmatization and discrimination. Proof of this is their desire to conceal their bankruptcy from family members and associates whom they feel would be critical of what they perceive to be their fiscal mismanagement. To quote: Virtually every debtor whose parents were still living tried to withhold knowledge of the bankruptcy from them. Older debtors whose parents had passed away commented that "if they knew, they'd spin in their graves." One woman, whose father was visiting when the researcher arrived for the interview, nearly pushed the interviewer off the front steps out of fear (as she explained later) that if her father saw the researcher, he would ask disconcerting questions and potentially learn of the bankruptcy. If one looks at stigma as the social devaluation or deliberate alienation of an individual who deviates from a behavioural norm, such behavioural norm being â€Å"a shared belief of a particular social unit that individuals should act in a certain way under ce rtain circumstances† (Stafford and Scott (1986: 81), then it is fairly obvious that when something becomes common, or when there are enough individuals who file for bankruptcy, it ceases to be a reason for stigma. An analogy could be premarital sex. In the past, there were not a lot of people who engaged in premarital sex and hence it was a stigma. But now, because it had become fairly common, there was no reason to feel stigmatised or ashamed. Fay, Hurst and White (2002: 708) also suggested that households file for bankruptcy when it becomes economically beneficial for them to do so. This paper argues however, that stigmatisation still affects those who file for bankruptcy. The empirical data accumulated by Thorne and Anderson prove this, so do Sutton and Callahan who said that even firms experience stigmatisation. â€Å"The bankrupt firms we studied were often shunned by members of their organizational audiences. The leaders we interviewed were hurt and embarrassed.(1987: 4 06)†. The reason is simple: no matter how common poverty is, it still causes stigmatisation. Bankruptcy is an indication of poverty. It is an indication of inability to pay off one’s debts. Even if there are a lot of people doing it, it is still is a cause for shame when one admits in official documents that he or she is asking to be legally discharged from debts contracted. Since childhood, people have been programmed to aspire towards prosperity and a certain way of life. Bankruptcy is a signal that that aspiration has not been met and that,

Stages of Building Construction

Stages of Building Construction Building a project involves various stages including initial preparation of the clients brief, scheduling and research, specifications and construction development. Plans, designs and changes occur throughout a project, inevitably, therefore there must be a unified desire for communication, understanding and agreement. Design/Planning In order for a project to develop into an eventual success communication, understanding and agreement are essential. Comprehensive consultations concerning desires in terms of design, constructability and practicality are imperative. An insight into the clients personal requirements and expectations will also prove fundamental to sustain achievement. However clients are not always exact about all the characteristics of their requirements; professional teams therefore act as advisors. As opinions change plans will have to be altered consequently to accommodate the new needs (Ashworth 2005). Sufficient planning and designing must be undertaken before any sort of construction commences on any development. Planning consists of the early congregation of information and ideas before a detailed design and construction process is exemplified. During this period parties involved in the development should identify any particular requirements, discuss important issues, resolve any disparities if any and assign tasks amongst other requests. Before advanced designing and development can begin, planning authorities must consent to the proposed project after comprehensive assessment. In some cases warrants must be granted for building work to begin on a site, most contractors require this to demolish or build on a site (Civitelo 2007). As the size and/or scale of a project increases costs will ultimately also go up (Ashworth 2005), therefore the planning team will have to combine the design of the project with cost saving solutions. This may mean making sacrifices in terms of some materials used in the project; this will for example reduce costs and allow the funds to be transferred to building a project of larger magnitude as costs rise. For this reason the planning stage is extremely important as conclusions will have to be drawn as to how much space is actually required for the development, too little and the project could be considered a disaster, too much and it could prove wasteful. There are many standards and legislation in the construction industry; these are set up for the benefit of the client making use of the development. Other legislation on the other hand is aimed at protecting the environment and wildlife. The purpose of legislation is to provide a regulatory body to ensure the efficient build of safe places for work and handling. A forthright view held by many is that legislation and standards add to costs and are not munch benefit at all however these claims need to be carefully dissected. Legislative requirements are aimed at increasing safety and are approved by a professional body having conducted tests and analysis. Projects, however small, are affected by an immense set legislation; primarily because efficient development is profoundly reliant on safe places of work and the safe handling of construction material and plants. As a result of this projects will always consist of a large team including clients, engineers, architects, contractors, government and regulating bodies and labourers (Ashworth 2005). An addition to this team is lawyers. When plans are drawn up for a project the parties involved must agree to contracts containing clauses with regards the development in question. Content of the contract may include articles with contemplation to budget, time and materials amongst other clauses. These need to be carefully examined as they can prove to become the reason for the downfall of a failed project. During the design process planners and designers must outline the function and suitability of materials whilst taking into consideration economic and ecological consequences (Hinze 2010). Architects for example would be most involved in the design considerations of a project, however as some parts of a plan cannot be considered without first finding out about planning consent, because of this a reasonable amount of significant decisions cannot be considered. When designing a project plans submitted must take into account expenses as prices are relentlessly rising. Today, most projects involve an organization which is able to economically forecast costs of not only principal costs but also costs of control services. The establishment also find the most economical ways of ensuring that a development does not run over budget. Before plans are put forward a review must be taken on designs to ensure that the ideas can be implemented in terms of both construction techniques and materials. The aim of these reviews called Constructability Reviews is to minimize the number of changes at a later stage, reduce delays and rising costs (Palmer 2002). Construction Once construction is ready to begin, preliminary work needs to commence to allow initial works to be carried out, these include the clearing of the work site, a ground survey to asses the ground conditions, setting up of sanitary facilities, water/power supplies and offices and storage areas. Sufficient welfare amenities will need to be established on a construction site for use by workers throughout a development, this will need to be arranged by the project manager in advance. Provisions will include rest rooms, toilets, storage rooms, changing rooms and washrooms as well. (Hinze 2010) These facilities will be essential for the length of a project to evade disturbance to a project. In some circumstances however, the project manager may not require some facilities and will instead be able to make use of permanent services available on site. For example, the client may allow the construction team to use toilets already installed on site. This will therefore reduce costs which may have been incurred if the welfare facilities were required. When welfare amenities are required the project manager should aim to locate these in various locations and not a single area, this reason for this is that having them in one area may prove to be an inconvenience. For example if the site is very large, then the project manager may find that time is wasted going to and from the welfare facilities rather than using the time constructively. When the preliminary works have been completed demolition on the site can begin, since the site is located on a 10 ha site of old forest 5 miles out of the town centre; suitable access and transportation will need to be arranged for plant/machinery. The demolition stage will result in the recycling of materials, the forest trees for example can be recycled for timber use during the construction process; this increases the developments sustainable considerations. After the site has been fully cleared, excavation will be completed to create the required ground conditions, be it flat or, according to the design specifications. In many cases the land in which a project is developed can provide difficulties in terms of workability. Loose soil, often at a shallow depth, is an inevitable problem that can be solved using deep foundations; in this case however, shallow foundations will be used as outlined in the brief (Palmer 2002). The excavation stage will also prepare the site for eventual service installation and the construction of the substructure. Excavation will be carried out using various machines, plant is required during the construction process in order to increase production, minimize labour requirements, conduct high standards of constructions and also possibly reduce overall costs (Cooke 1997). During the planning process decisions must be made with regards the availability and use of plants. The substructure will consist of reinforced concrete foundations to allow sufficient support of the buildings by transporting the load to the ground, this will be especially vital for the community hall which will consist of a steel frame and metal cladding roof. Service works will also need to be carried out during the substructure stage to allow for pipes/cable routes to be considered also, drainage and refuse systems will need to be allowed to pass through and leave the various sites, be it below ground or through walls. Services however must not pass below foundations (Hinze 2010). The superstructure on the other hand will require extensive work, relating to the floors, walls and roofs; these will all be subject to the design specifications. Scaffolding will be required when working on raised platforms i.e. first floor levels, roofs etc, these will consist of steel or aluminium alloy tubes. As the development will consist of a 200 home housing estate, the homes will be of identical layout and size, for this reason pre-fabricated timber roof trusses will be delivered and hoisted into position before being placed on the supporting walls. The floors and ceilings in the homes will be timber constructed where as the community centre will consist of a concrete floor and metal cladding roof. The walls in the homes will be brick and block masonry fully insulated cavity walls, these will be plastered inside. Completion of the substructures and superstructures will then allow the services to be introduced to the buildings; these include drainage, pluming, gas and sanitary works. Some services will require installation below ground, specifically in trenches. Service works generally cause widespread disruption to the public, especially to traffic through road works; there should be a significantly lower impact however, since the housing project is being developed on an old forest site. Local authority permission must be granted before work commences, this will involve in the inspection of works carried out already and final tests being conducted. The plumbing works, which are installed above ground, will benefit from construction after the basic structural works have been completed. The finishes relating to the build require extensive organisation to ensure that they are completed accordingly as certain processes cannot begin until others have been completed. For this reason, a larger number of workers should be employed to carry out the finishing works simultaneously when possible, to ensure timely completion. The landscaping with regards this project should not be very costly as the location chosen for the project is an old forest, in comparison to some builds which are built in an area which requires more greenery and trees to be planted. Methods of circulation and travel will need to be established however including roads and footpaths. With regards the community centre security will need to be addressed as a priority as it will be serving the local community, including children for example. The project will not be completed until the site has been fully cleared and inspected. All surplus material and debris will not to be transported and disposed of accordingly or recycled if possible. Plants, offices and huts will need to be dismantled and cleared as well. The site must be left in a very good condition to allow inspection by various teams and bodies to ensure the development is both up to standard, matches the design specification and is also safe for occupation (Cooke 1997).

Womens Freedom during Chinas Revolutionary Period Essay -- Asian His

Women's Freedom during China's Revolutionary Period During the revolutionary period in China from 1921 to 1934, although there were undercurrents of an actual feminist movement, according to Kay Ann Johnson in Women, the Family & Peasant Revolution in China, women’s progress resulted more as a necessity of the war than the leadership’s commitment to emancipate women. Furthermore, when tension arose between men and women, the leadership usually appeased men over women. By not discussing the mentality of the political parties and the dynamics of the war, Hughes and Hughes’ critique lacks an explanation of the underlying motives that drove these parties to sometimes support women and other times reject women’s interests. Hughes and Hughes explain that â€Å"male educators and members of the KMT now proclaimed Chinese women emancipated† (H&H 237). However, Johnson’s critique paints quite a different and more complex emancipation. The philosophies of the Chinese Communist Party (CCP) reflected undertones of feminist thought and consideration. The CCP’s ideology developed in the early twentieth century as a result of a radical intellectual movement in urban areas composed of disillusioned students and professors. The CCP did recognize women’s progressive demands and desires for equal rights. In 1922, at the Second National Congress, the Party established the Women’s Department which aided women’s revolutionary political activity (Johnson 41). The Manifesto of the Second Congress responded to women’s groups such as the Woman Suffrage Alliance and the Alliance for the Women’s Rights Movements by including objectives such as â€Å"the limited right to vote for all workers and peasants, regardless of sex, [and] protect... ...ower in the war. Thus, it is difficult to assess whether women did attain emancipation since emancipation under such a politically charged atmosphere seems rather tainted. In addition, when conflict arose between men and women, politics usually supported male interests. Hughes and Hughes do not fully illustrate the complex motives that drove these parties to either support or abandon women’s interests in order to maintain political unity. Thus, it is problematic to only read Hughes and Hughes critique because it lacks an in-depth discussion of the complex dynamics during the revolution. Works Cited Hughes, Sarah Shaver and Brady Hughes. Women in World History: Readings from 1500 to the Present. Vol 2. New York: M.E. Sharpe Inc., 1997. Johnson, Kay Ann. Women, the Family and Peasant Revolution in China. Chicago: The University of Chicago Press, 1983.

Yuvraj Singh

Yuvraj Singh pronunciation (help ·info) (born 12 December 1981) is an Indian cricketer, and the son of former Indian fast bowler and Punjabi movie star Yograj Singh. [1] Yuvraj is a left-hand middle-order batsman and a slow left-arm orthodox bowler. He has been a member of the Indian cricket team in ODIs since 2000 and played his first Test match in 2003. He was the vice-captain of the ODI team from late-2007 to late-2008.At the 2007 World Twenty20, he famously hit six sixes in an over against England's Stuart Broad — a feat performed only three times previously in any form of senior cricket, and previously never in an international match between two Test cricket nations. He was named the Man of the Tournament in the 2011 Cricket World Cup and was one of the top performers at the 2007 World Twenty20, both of which India won. In 2011, he was diagnosed with a cancerous tumor (stage-I) in his left lung and underwent chemotherapy treatment at the Cancer Research Institute in Bos ton, USA as well as Medicine Facilities in Indianapolis, Indiana. 2][3] In March 2012, Yuvraj was discharged from hospital after completing the third and final cycle of chemotherapy and returned to India in April. [4][5] He was conferred with Arjuna Award, India's second highest sporting award in the year 2012 by the President Pranab Mukherjee. [6] He made his international comeback in a Twenty20 match in September against New Zealand shortly before the 2012 World Twenty20.

Natural Fiber Wide Use Health And Social Care Essay

Natural fibres have been in a broad usage since the development of the human race. Catching up the Eco thrust, applied scientists were looking for eco-friendly options for fictile fibre. In the due class many natural fibres have been tested and some were able to do their base going economically feasible. The present work proposes to fix and prove a Natural Fiber ( Asian Palmyra ) Reinforced Composite ( NFRC ) . The survey is planned in conformity to a 3-Level Factorial Design and find the fluctuation of Tensile Strength ( TS ) , of short and indiscriminately oriented Palmyra NFRC, under control parametric quantities such as alkali intervention clip, fiber length and fiber volume % . The present paper focuses to pattern the influence of procedure variables on TS through Response Surface Methodology. The mathematical theoretical account which is developed to foretell tensile strength is found statistically valid and sound within the scope of the factors. Keywords: A – Discontinuous support, B – Mechanical belongingss, C – Statistical properties/methods, D – Mechanical testing, E – Lay-up ( manual ) .1. Introduction:Natural fibre has been in a broad usage since the development of the human race. They had got broad acceptation in communities for their flexibleness and strength. Recent tendencies in the country of fibre reinforced complexs have drawn a twine in utilizing these natural fibres as their support. The natural fibre imparts lower lastingness and lower strength compared to glaze fibres. However, low specific gravitation consequences in a higher specific strength and stiffness than glass. Natural fibres offer good thermal, dielectric and acoustic insularity belongingss along with easiness in processing technique without have oning of tools. Most of these fibres are produced in developing states like China, India and Brazil etc. In a historical position complexs like straw reinforced walls, bows and chariots made of pasted beds played of import functions in their endurance. Though many of these fibres are limited to their epidemic parts due to high local demand for many old ages, coming of man-made fibres have affected the market of natural fibres. After being entirely used for their electromagnetic belongingss, utilizing complexs to better the structural public presentation of ballistic capsule and aircraft became popular in last two decennaries of the old century. Particularly, increased constrains and future environmental route maps, have been emphasizing automotive industries to diminish their C pes prints. These rigorous steps have become blessing to the lagging natural fibre industries, and thereby making new challenges for research workers in happening beginnings of fibre, fiction techniques and applications of na tural fibres. The easy handiness of natural fibres and fabricating have motivated research workers worldwide late to seek locally available cheap fibres and to analyze their feasibleness of support intents and to what extent they satisfy the needed specifications of good reinforced polymer complexs [ 1 ] . Many surveies proved them to be possible rivals to man-made fibre to some extent. After reexamining the bing literature available on natural fibre complexs, assorted writers had put attempts in planing complexs based on the demands of composite industry. There has been a broad assortment of literature available on natural fibres such aspen, abaca, bagasse, bamboo, banana, coir, day of the month thenar, flax, henequen, isora, jute, silk cotton, deccan hemp, oil thenar, Ananas comosus, ramee, sisal, etc. , [ 2-18 ] . Natural fibre complexs provide comparable specific strength with that of man-made fibre complexs, due the low denseness offered by natural fibres [ 19 ] . There are many parametric quantities which affect the public presentation of a natural fiber-reinforced complex. Chemical alteration improvesA fiberA matrix adhesion, their consequences and effects on the physical belongingss ofA complexs [ 20 ] . Aspect ratio has a considerable consequence on composite belongingss, henc e it is of import to conserve fiber length every bit much as possible during composite processing operations [ 21 ] . Mechanical belongingss of the composite vary with assorted sums of fibre volume ratio. But there have been a really few documents covering with Palmyra fibre, the present fibre of our involvement [ 22 – 24 ] . The Borasseus Flabellifer is a tall and vertical thenar, and can populate 100 old ages or more and make a tallness of 30 m, with a canopy of big, fan-shaped foliages several twelve found distributing 3 metres across [ 25 ] . Each and every portion of the tree is a noteworthy socio-economic value for people in Southern India. The mid-ribs of the foliages and the fibres from their chaffs are used in doing industrial coppices and brooms. The fibre has good opposition to clash and heat, and will defy many chemicals and dissolvers. The denseness of toddy palm ( 0.7 gm/cm3 ) is least among all known natural fibres that are being commercially used in fabricating natural fibre complexs. This is extremely favourable belongings from the position point of light-weightiness. The present complex can happen extended application in non-structural, low-performance utilizations. Hence, the toddy palm fibres are most suited for doing support in green composite stuffs. The present research focuses on the survey and consequence of procedure parametric quantities on the tensile strength of short and indiscriminately oriented palmyra natural fibre reinforced complexs. The decisions drawn from this is that, a successful combination of procedure parametric quantities consequences in the betterment of mechanical belongingss of the composite. In future, complexs will be manufactured even more harmonizing to an integrated design procedure ensuing in the optimal building harmonizing to parametric quantities such as form, mass, strength, stiffness, lastingness, costs, etc. The developed mathematical theoretical account will be able to demo the influence of a design alteration on each one of these parametric quantities ( here strength ) .2. RESPONSE SURFACE METHODOLOGY:Response surface methodological analysis ( RSM ) began with the work of Box and Wilson in the Journal of the Royal Statistical Society [ 26 ] . That work was motivated by the demand to run expe riments expeditiously, by a proper pick of design, and to find operating conditions on a set of governable variables that give rise to an optimum response. The cardinal thoughts in the classical RSM are developed utilizing additive multinomial theoretical accounts, chiefly first-degree and second-degree theoretical accounts, with uninterrupted response variables assumed, for the most portion, to be independently and usually distributed with changeless mistake discrepancies. This method has gone through several phases of development that are aimed at doing it more applicable to wider experimental state of affairss [ 27 ] . RSM is a aggregation of mathematical and statistical techniques that are utile for the mold and analysis of jobs in which a response of involvement is influenced by several variables and the aim is to optimise the response [ 28 ] . For, illustration, if the experimenter wishes to happen the degrees of two input variables, x1, x2 which maximize the output [ y ] of the procedure, so the procedure output is stated as: where I µ represents the noise or mistake observed in the response Y. If the expected response is denoted by E [ y ] = f [ x1, x2 ] = I · , so the surface represented by I · = f [ x1, x2 ] is called a response surface. If the individual input variable can be related to the end product variable so it is known as response curve and if the two input variables relate to the end product variable so it is known as response surface [ 28 ] . In common pattern, response surfaces are expressed diagrammatically and visualized through single secret plans, contours and 3D surface graphs.3. SPECIMEN Fabrication:The petioles of Asiatic Palmyra tree were soaked in a H2O retting armored combat vehicle for 45 yearss. After 45 yearss, the fibre can be extracted from the chaffs manually. These long uninterrupted fibres are washed exhaustively in plentifulness of clean H2O to take the excess waste ( fig. 1 ) .3.1 ALKALI TREATMENT:The obtained fibres were divided into three parts of equal weight. Th ese three groups of fibre were treated with 5 % NaOH solution for different clip continuances. The first group is treated for 2 hours, the 2nd for 4 hours and the 3rd for 6 hours. Chemical intervention with NaOH removes wet content from the fibres thereby increasing its strength. The chemical intervention besides clears all the drosss that are bordering the fiber stuff and besides stabilizes the molecular orientation. After alkali intervention, fibres were washed exhaustively in the distilled H2O and were dried for one twenty-four hours at room temperature. Then these long fibres were cut into short fibres of different lengths ( 3mm, 5mm and 7mm ) . The fibres which were treated for 2 hours with NaOH are cut into equal sums of 3mm, 5mm and 7mm fibres severally. Similarly, the fibres which were treated with NaOH for 4 hours and 6 hours were besides cut into short fibres. Therefore nine different samples of fibre were prepared which vary in fibre length and alkali intervention hours.3.2 PREPATION OF COMPOSITES:A rectangular wooden board of 300mm, 300mm was taken and wooden forms of thickness 4mm were fixed on these wooden boards with the aid of nails. These wooden forms were placed so that a infinite of 150mm, 10mm, and 4mm was obtained. After the molds of needed dimensions were prepared, wax was applied to the interior sides of the molds for easy release of the complex without lodging to the mold walls. Then the matrix was prepared by blending the hardener to epoxy. The epoxy and the hardener ratio were maintained at 10:1. To acquire goo d cured and a standard quality specimen, the epoxy and hardener must be assorted swimmingly and easy for about 10 proceedingss. Initial bed of the mold was filled with the epoxy rosin and hardener mixture and so the appropriate measure of fibres was placed such that epoxy mixture wholly spread over the fibres. Again, epoxy mixture was poured on the fibre. Therefore, the starting and stoping of the beds were of epoxy rosin. A fictile releasing house was placed on the top of the uncured mixture. Before using compaction, attempts were made to take all bubbles with roller. Finally, the compaction force per unit area of 0.05 MPa was applied equally and cured for 24 hours at room temperature. In this manner, specimens incorporating different volume fractions of fibre were prepared. These specimens were cured in the hot air oven at 600 C for 2 hours. Specimens incorporating different fibre volume fractions such as 20 % , 30 % , 40 % were prepared and 27 specimens were prepared. Natural Fib er Reinforced Composite ( NFRC ) is considered as the stuff for probe and its material composing is given in Table 4.1. The specimen ( Fig. 2 ) is prepared with the dimensions of 150mm length, 10mm breadth and 4mm thickness harmonizing to ASTM D 3039-76 [ 29 ] is used for experimentation.3.3 MECHANICAL Testing OF FIBER-REINFORCED COMPOSITE:The most basic mechanical trial is the tenseness trial. For most structural stuffs, the tensile belongingss are indispensable elements of the stuff design allowable. The complexs specimens were tested as per ASTM criterions. The tensile testing was done as per ASTM D 3039M with the aid of INSTRON-6025 theoretical account Universal Testing Machine ( Fig. 3 ) at a crosshead velocity of 2mm per minute and consequences were analyzed to cipher the tensile strength of composite samples.4. Plan AN Experiment:Recognition of job and job statement:â€Å" Determine the affect of Alkali Treatment Time, Fiber length & A ; % Fiber volume on the tensile strengt h of Natural Fiber ( short Asian Palmyra ) Reinforced Composite. †Choice of factors, degrees, scopes:Alkali Treatment Time ( A ) , Fiber length ( B ) , Fiber volume % ( C ) ( 3 Levels )Choice of the response variable:Tensile Strength of Natural Fiber Reinforced Composite ( T ) .Choice of experimental design:3 flat factorial design.Performing the experiment:Tensile strength on Universal Testing Machine ( UTM ) .Statistical analysis of informations:A, B, C relation to TDecisions and recommendations:Accomplishment of experiment aims.4.1 DESCRIPTION OF PROPOSED METHODOLOGYThe control factors considered for experiments are alkali intervention clip, fiber length and fibre volume per centum while tensile strength is considered as the end product response. The process of response surface methodological analysis comprises the undermentioned stairss [ 30 ] : Plan a series of experiments for equal and dependable measuring of the response of involvement. Develop an empirical or mathematical theoretical account of the 2nd order response surface with the best adjustments. Find the optimum set of experimental parametric quantities that produce a upper limit or minimal value of response. Represent the direct and the synergistic effects of procedure parametric quantities through two and three dimensional secret plans.4.1.1 Conducting the experimentsThe executable scopes of the procedure control variables considered are listed in Table 4.2. These values correspond to the conditions at which there is maximal consequence on tensile strength as reported by other writers for different natural fibres. The belongingss of Asiatic Palmyra fibre reinforced complexs with different fibre lengths, clip continuances of Alkali intervention and fibre volume per centums under these conditions, the probes are presented in the undermentioned Tables 4.3, 4.4 and 4.5. Sample of tensile trial studies are shown in Fig. 4. The tensile strength of the specimen made of epoxy and hardener is 12.44MPa.4.2 DEVELOPMENT OF EMPIRICAL MODELSThe informations collected from typical experiments refering to end product responses, Tensile Strength from Tables 4.3, 4.4 and 4.5 are used to implement the proposed methodological analysis. The demand in developing the mathematical relationships is to associate the tensile strength to the procedure parametric quantities thereby easing the optimisation of the procedure parametric quantities. Design Expert, 8.0v [ 31 ] , statistical analysis package, is used to calculate the arrested development coefficients of the proposed theoretical accounts. The interaction effects of the procedure parametric quantities and tensile strength are important and hence the 2nd order theoretical accounts are postulated. The multinomial is fitted and the relationships obtained for the end product responses are given below:4.2.1 Adequacy trial:The developed empirical theoretical accounts are tested for their adequateness utilizing the undermentioned trials:4.2.1.1 Analysis of Variance [ ANOVA ] :ANOVA is carried out for the quadratic response surface theoretical accounts. The statistics of ANOVA for Tensile Strength is given in the Table 4.6. In instance of tensile strength, it can be observed from Table 4.6 that the value of â€Å" Probability & gt ; F † for the theoretical account is less than 0.05, which indicates that the theoretical account is important [ 28 ] .4.2.1.2 Multiple arrested development coefficients:To look into whether the fitted theoretical accounts really describe the experimental information, the multiple arrested dev elopment coefficient [ R2 ] is computed. R2 statistic is defined as the ratio of variableness explained by the theoretical account to the entire variableness in the existent experimental informations and is used as a step of goodness of fit [ 28 ] . If R2 attacks to integrity, the better the theoretical account fits the experimental information. In other words, it is the proportion of fluctuation in the dependant variable [ response ] that can be explained by the forecasters [ factor ] in the theoretical account. From Table 4.6, R2 for tensile strength is found to be 0.9276. This shows that the second-order theoretical account can explicate the fluctuation in tensile strength up to the extent of 92.76 % . The adjusted R2 efforts to give a more appropriate value to gauge R2. Adjusted R2 can be computed utilizing the expression 1- [ [ 1- R2 ] * [ N-1 ] / [ N-k-1 ] ] , where N is the figure of observations and K is the figure of forecasters [ 28 ] . When N is little and K is big and there will be a much greater difference between R2 and adjusted R2 [ because the ratio of [ N-1 ] / [ N-k-1 ] will be much less than 1. By contrast, when the figure of observations is really big compared to the figure of forecasters, the value of R2 and adjusted R2 will be much closer because the ratio of [ N-1 ] / [ N-k-1 ] will near 1. From Table 4.6, adjusted R2 for tensile strength is found to be 0.8915. It can be observed that the values of R2 and adjusted R2 are much closer to each other. The developed mathematical theoretical accounts are farther checked for their adequateness utilizing normal chance secret plan of remainders. The diagnostic secret plans are drawn to look into whether the informations are usually distributed and for any premise is violated. Therefore, the normal chance secret plan of remainders for the responses, tensile strength is plotted. Normal chance secret plans are used to measure whether informations come from the normal distribution. The statistical process makes the premise that an implicit in distribution is normal [ 28 ] . Thus normal chance secret plans can supply confidence that the premise is justified, or else supply a warning of jobs with the premise. An analysis of normalcy typically combines normal chance secret plans with hypothesis trials for normalcy. In a normal chance secret plan, if all the information points autumn near the line, an premise of normalcy is sensible. Otherwise, the points will swerve off from the line, and an premise of normalcy is non justified. The normal chance secret plans of the remainders for the end product responses, tensile strength is shown in Fig. 5 and it can be observed that the remainders are located on consecutive line, which means that the mistakes are distributed usually. The 3D surface graphs for tensile strength are shown in Figs. 6 – 8. All have curvilinear profile in conformity to the quadratic theoretical account fitted. Fig. 6 shows the interaction consequence of fibre length and alkali intervention clip on tensile strenth at different degrees of fibre volume per centum. It is clear from the figure that at highest values of fibre length and alkali intervention clip the tensile strenth attains largest value of 27MPa. At high value of alkali intervention clip ( 6Hrs ) and low value of fiber length ( 3mm ) , tensile strength varies from 17-19 MPa. where as at low value of both fiber length and alkali intervention clip the tensile strength is lowest. Fig. 7 depicts the consequence of fibre volume per centum and alkali intervention clip on tensile strength at different degrees of fibre length. As indicated in the secret plan the tensile strength additions with addition in both fiber volume per centum and alkali intervention clip. The highest value of tensile strength of about 27MPa is recorded at high values of fibre volume per centum and alkali intervention clip. Fig. 8 describes the interaction consequence of fibre volume per centum and fiber length on tensile strength of short and indiscriminately oriented Palmyra fiber composite at different degrees of base intervention clip. As the fibre volume per centum additions from 20 – 40 % and fibre length increasing from 7 – 3mm so tensile strength additions from 13 – 27 MPa. The combined consequence of fibre length and fibre volume per centum increases the tensile strength of composite. It can be said that the empirical theoretical accounts developed were moderately accurate, for Tensile strength.5 DecisionThe proposed work is on the survey and consequence of procedure parametric quantities on the tensile strength of short and indiscriminately oriented toddy palm fibre reinforced complexs. The experimental probe on mechanical behavior of palmyra fibre reinforced complexs leads to the undermentioned decisions: Tensile strength ( TS ) , of the toddy palm fibre reinforced compos ite stuff is greatly influenced by alkali intervention clip, fiber length and fibre volume fraction. The quadratic theoretical account developed by RSM can be used to foretell the tensile strength of the toddy palm fibre reinforced composite stuff at 93 % assurance degree. But the cogency of the theoretical account is limited to the scope of parametric quantities considered for the probe. The truth of the developed theoretical account can be improved by including more figure of parametric quantities and degrees. Further, mathematical theoretical accounts can be developed by taking multiple responses, with different scopes of procedure variables and the composite design can be optimized based on the demand of the clients.

How to Enable Java in Chrome and Other Browsers

How to Enable Java in Chrome and Other Browsers The Java plugin is part of the Java Runtime Environment (JRE) and allows a browser to work with the Java platform to run Java applets to execute in the browser. The Java plugin is enabled in a large number of browsers around the world and this makes it a target for malicious hackers. Any popular third-party plugin is subjected to the same kind of unwanted attention. The team behind Java have always taken security seriously and they will endeavor to quickly release an update to patch any serious security vulnerabilities found. This means the best way to minimize problems with the Java plugin is to make sure it is up-to-date with the latest release. If you are really worried about the security of the Java plugin but still need to visit a popular website (e.g., online banking in some countries) that need the Java plugin enabled, then consider the two browser trick. You can use one browser (e.g., Internet Explorer) only when you want to use the websites using the Java plugin. For the rest of the time use another browser, (e.g., Firefox) with the Java plugin disabled. Alternatively, you might find that you dont go to websites that use Java very often. In this case, you may prefer the option of disabling and enabling the Java plugin as needed. The instructions below will help you to set up your browser to disable (or enable) the Java plugin. Firefox To turn on/turn off Java applets in the Firefox browser: Select Tools - Add-ons from the menu toolbar.The Add-ons Manager window appears. Click on Plugins on the left-hand side.In the list on the right select, the Java Plugin - the name of the plugin will vary depending on whether you are a Mac OS X or Windows user. On the Mac, it will be called Java Plug-in 2 for NPAPI Browsers or Java Applet Plug-in (depending on the operating system version). On Windows, it will be called Java (TM) Platform.The button to the right of the selected plugin can be used to enable or disable the plugin. Internet Explorer To enable/disable Java in the Internet Explorer browser: Select Tools - Internet Options from the menu toolbar.Click on the Security tab.Click on the Custom level.. button.In the Security Settings window scroll down the list until you see Scripting of Java applets.Java applets are Enabled or Disabled depending on which radio button is checked. Click on the option you want and then click OK to save the change. Safari To enable/disable Java in the Safari browser: Select Safari - Preferences from the menu toolbar.In the preferences, window click on the Security icon.Make sure the Enable Java checkbox is checked if you want Java enabled or unchecked if you want it disabled.Close the preferences window and the change will be saved. Chrome To turn on/turn off Java applets in the Chrome browser: Click on the wrench icon to the right of the address bar and choose Settings.At the bottom click the link called Show advanced settings...Under the Privacy, section click on Content settings...Scroll down to the Plug-ins section and click on Disable individual plug-ins.Look for the Java plugin and click on the Disable link to turn off or the Enable link to turn on. Opera To enable/disable the Java plugin in the Opera browser: In the address bar type in opera:plugins and hit enter. This will display all the installed plugins.Scroll down to the Java plugin and click on Disable to turn off the plugin or Enable to turn it on.

Superfluids essays

Superfluids essays "As we shall see, it is generally believed that the phenomenon of superfluidity is directly connected with the fact that the atoms of helium-4 obey Bose statistics, and that the lambda-transition is due to the onset of the peculiar phenomenon called Bose condensation." (Leggett, 1989) This is the phenomenon wherein the bosons (a type of particle) making up a substance merge into the lowest energy level, into a shared quantum state. In general, it refers to the tendancy of bosons to occupy the same state. This state, formed when a gas undergoes Bose-Einstein condensation, is called a Bose-Einstein condensate. The distinguishing feature of Bose-Einstein condensates is that the many parts that make up the ordered system not only behave as a whole, they become whole. Their identities merge or overlap in such a way that they lose their individuality entirely. A good analogy would be the many voices of a choir, merging to become 'one voice' at certain levels of harmony. The phenomenon of superfluidity was discovered in 1937 by a Russian physicist, Peter Kapitza, and then studied independently in 1938 by John Frank Allen, a British physicist, and his coworkers. It wasnt until the 1970s however, that the useful properties of superfluids were discovered. Thanks to the work of David Lee, Douglas Osheroff and Robert Richardson at Cornell University, we have gained valuable information on the effects and uses of superfluids. These three scientists jointly received a Nobel Prize in Physics in 1996 for their discovery of superfluidity in helium-3. It took a while, however, before they actually figured out what this phase in helium was. Superfluidity in helium-3 first manifested itself as small anomalies in the melting curve of solid helium-3 (small structures in the curve of pressure vs. time). Normally, small deviations, like this one, are usually considered to be peculiarities of the equipment, but th...

Financier Russell Sage Attacked in 1891 Office Bombing

Financier Russell Sage Attacked in 1891 Office Bombing One of the wealthiest Americans  of the late 1800s, financier Russell Sage, narrowly escaped being killed by  a powerful dynamite bomb after a visitor to his office threatened him with a bizarre extortion note. The  man who detonated a satchel packed with explosives  in Sages lower Manhattan office on December 4, 1891, was blown to pieces. The strange incident took a grisly turn when the police tried to identify the bomber by displaying his severed head, which had been remarkably undamaged. In the highly competitive era  of  yellow journalism, the shocking attack on one of the citys richest men by a bomb thrower and a madman was a bonanza. Sages dangerous visitor  was identified a week later as Henry L. Norcross.  He turned out to be an outwardly ordinary office worker from Boston whose actions shocked his family and friends. After escaping the massive explosion with minor injuries, Sage was soon accused of having grabbed a lowly bank clerk to use as a human shield. The badly injured clerk, William R. Laidlaw, sued Sage.  The legal battle dragged on throughout the 1890s, and  Sage, widely known for eccentric frugality despite his $70 million fortune, never paid a cent to Laidlaw. To the public, it just added to  Sages miserly reputation. But Sage stubbornly maintained he was simply adhering to principle. The Bomber in the Office On December 4, 1891, a Friday, about 12:20 p.m., a bearded man carrying a satchel arrived at Russell Sages office  in an old commercial  building at Broadway and Rector Street. The man demanded to see Sage, claiming he carried a letter of introduction from John D. Rockefeller. Sage was well-known for his wealth, and for his associations with robber barons like Rockefeller and the notorious  financier Jay Gould. He was also famous for frugality. He frequently wore, and mended, old clothing. And while he could have traveled with a  flashy carriage and team of horses, he preferred to commute by elevated trains. Having financed New York Citys  elevated railroad system, he carried a pass to  ride for free. And at the age of 75 he still arrived at his  office every morning  to manage his financial empire. When the visitor demanded loudly to see him, Sage emerged from his inner office to investigate the disturbance.  The stranger approached and handed him a letter. It was a typewritten extortion note, demanding  $1.2 million. The man said he had a bomb in his bag, which he would set off if Sage didnt give him the money. Sage tried to put the man off by saying he had urgent business with two men in his inner office. As Sage walked away, the visitors bomb, intentionally or not, detonated. Newspapers reported that the blast frightened people for miles. The New York Times said it had been clearly heard as far north as 23rd Street. In the downtown financial district, office  workers ran into the streets in a panic. One of Sages young employees, 19-year-old stenographer and typewriter Benjamin F. Norton, was blown out a second floor window. His mangled body landed in the street. Norton  died after being rushed to the Chambers Street Hospital. A number of people in the suite of offices received minor injuries. Sage was found alive in the wreckage.  William Laidlaw, a bank clerk who had been delivering documents, was sprawled on top of him. A doctor would spend two hours pulling shards of glass and splinters out of Sages body, but he was otherwise uninjured. Laidlaw would spend about seven weeks in the hospital. Shrapnel embedded in his body would cause him pain for the rest of his life. The bomber had blown himself up. Parts of his body were scattered throughout the wreckage of the office. Curiously, his severed head was relatively undamaged. And the head would become the focus of much morbid  attention in the press. The Investigation The legendary New York City police detective Thomas F. Byrnes took charge of investigating the case. He began with a ghastly flourish, by taking the bombers severed head to Russell Sages house on Fifth Avenue on the night of the bombing. Sage identified it as the head of the man  who had confronted him in his office. The newspapers began referring to the mysterious visitor as a madman and a bomb thrower. There was suspicion he may have had political motives and links to anarchists. The next afternoons 2 p.m. edition of the New York World, the popular newspaper owned by Joseph Pulitzer, published an illustration of the mans head on the front page. The headline asked, Who Was He? On the following Tuesday, December 8, 1891, the front page of the  New York World  prominently referred to the mystery and the weird spectacle surrounding  it: Inspector Byrnes and his detectives are still completely in the dark as to the identity of the bomb-thrower, whose ghastly head, suspended in a glass jar, daily attracts crowds of curious people to the Morgue. A button from  the bombers  clothing led police to a tailor in Boston, and suspicion turned to Henry L. Norcross. Employed as a broker, he had apparently become obsessed with Russell Sage. After Norcrosss  parents identified his head at the New York City morgue, they released affidavits saying he had never shown any criminal tendencies. Everyone who knew him said they were shocked at what he had done. It appeared he had no accomplices. And his actions, including why he had asked for such a precise amount of money, remained a mystery. The Legal Aftermath Russell Sage  recovered and soon returned to working.  Remarkably, the only fatalities were the bomber and the young clerk, Benjamin Norton. As Norcross seemed to have no accomplices, no one was ever prosecuted. But the peculiar incident moved into the courts following accusations by the bank clerk who had been visiting Sages office, William Laidlaw. On December 9, 1891, a startling headline appeared in the New York Evening World: As a Human Shield. A sub-headline asked Was He Dragged Between the Broker and the Dynamiter? Laidlaw, from his hospital bed, was claiming that Sage had grabbed his hands as if in a friendly gesture, and then pulled him close just seconds before the bomb detonated. Sage, not surprisingly, bitterly denied the accusations. After leaving the hospital, Laidlaw began legal proceedings against Sage. The courtroom battles went back and forth for years.  Sage was ordered at times to pay damages to Laidlaw, but he would stubbornly appeal the verdicts. After four trials over eight years, Sage finally won. He never gave Laidlaw a cent. Russell Sage died in New York City at the age of 90, on July 22, 1906. His widow created a foundation bearing his name, which became widely known for philanthropic works. Sages reputation for being a miser lived on, however. Seven years after Sages death, William Laidlaw, the bank clerk who said Sage had used him as a human shield, died at the Home for the Incurables, an institution in the Bronx. Laidlaw had never fully recovered from the wounds suffered in the bombing nearly 20  years earlier. Newspapers reported that he had died penniless and mentioned that Sage had never offered him any financial assistance.

Secualrization Essay Example | Topics and Well Written Essays - 2500 words

Secualrization - Essay Example Whereas secularization believes that no religion would be given privilege by a particular society in any respect (D’Costa, 2005). Secularization does not only mean cultural shifts but it also means development of science as perfectly described by Max Weber that secularization is â€Å"the disenchantment of the world† meaning that it eradicates superstition and replaces it with logic and science (Artigas, 2001). As the time goes by the meaning of secularism in respect of detaching oneself from religion started increasing, especially in the west. The new generation now is least bothered about religious norms and more bothered about the materialistic things in this world. If it is analyzed that which area in the west is getting the most affected it would certainly be the United Kingdom. UK at a point in history was very strict with religion and the church regulations, people who defied it saw death penalties as a punishment (Parsons, 1989). But nowadays religion has gone i n the backdrop of people living in the UK. The main reason of this research is the prevalence of secularism as the concept is making its way into the daily life of the citizens of UK and religion have taken a back seat in their lives. Hypothesis By the introduction, it is clear that the main reason of the dissertation is to verify the trend of following religion in The United Kingdom. Mathematically it could be said that: Ho: Religion is declining in the United Kingdom. Ha: Religious practices are accelerating in the United Kingdom Literature Reviewed Mostly for this dissertation, census of the United Kingdom would be used and primary data would be taken for consideration, processed and then an analysis of the key trends would be presented in this dissertation. The census which would be used in analyzing the dissertation would be dated from year 1850 up to year 2004. The entire census between this timescale would be in view for analyzing the thesis. The censuses which were available to be analyzed were the reports of 1881, 1911 and 2001 which had the relevant data. Methodology It is important in a dissertation that methodology of the research is concrete and clear to the reader so that the analysis which is presented to the reader is to the point and accurate. This dissertation is mainly about checking the reduction or increment ratio in the followers of the religions present in the United Kingdom. Mainly data from the census of 1881 and data of census 2001 would be used in comparison to see that if the followers of the religion in UK have declined or inclined. Also some data from the census of 1911 could be retrieved for use in this research. For this mostly interactive graphical presentation of tables and graphs would be helpful to understand the nature of the advancement or turnover. The quantitative data from these censuses would identify the upheavals from the year 1850 to 1911 till 2001 and tell that how much the human point of view about religion has ch anged and if now having a religion matters or not. As only the available data is of the year 1881, 1911 and 2001 census the limitation is that , there would be huge gap between the statistics of population and changes in the religious and secular sides . This would limit our research to just few census and information about religion given in it. But it does not mean that it would not give us the significant factors that we are looking for,

Event this week Assignment Example | Topics and Well Written Essays - 250 words

Event this week - Assignment Example Greece financial crisis has been marked by high budget deficits and unsuccessful bailouts. Although the problem seems to span for more than a decade, the real financial crisis picture became evident beginning 2007. IMF and Eurozone members have been giving bailouts to Greece by demanding austerity measures from Greece. However, the bailouts have only worsened the financial situation in both Greece and Eurozone as well. Greece may be only one member of Eurozone. However, the financial problems seem to drag the entire economic Zone down a financial recession. It seems that Greece financial problems cannot be solved by giving them money but by helping them to put into place strong money generating structures. Giving bailouts to Greece is like giving fish to a hungry man instead of showing a man how to fish. The rest of the world is watching how Eurozone mends its financial affairs. The strong Euro currency has been dropping with time and has actually recorded a 12-year low as of today. The Greece financial crisis ties very closely to this course. The situation shows how global economics are interrelated. A financial problem in one part of the global economy can have a large implication in other aspects of global economy. Therefore, the situation is relevant to the course learning about local and international economics. Traynor, I. (2015). Eurozone calls on Greece to come up with credible reforms. The Guardian. 9 March 2015. Retrieved from

Tell us about a time when you tried to reach a goal or complete a task Essay

Tell us about a time when you tried to reach a goal or complete a task that was challenging, difficult, or frustrating. What did you learn from this experience - Essay Example My role was to ensure that all the variables were working and that the bank registered additional clients as a result of the efforts of the sales department. The organization was experiencing stiff competition that called for aggressive sales strategy. As a sales representative, I was tasked with reaching prospective customers and make them register with the bank and deposit cash into their accounts. The move aimed at increasing the bank’s loanable funds and borrowing from the bank. Traditionally, the bank used personal selling and promotional camps to boost sales. With this in mind, the department arranged meetings with potential customers and gave them the details about the bank’s services. The meetings would also allow customers to ask questions regarding our products in order to contemplate making investment decisions (Pride & Ferrell, 2012). The sales representatives camped in several places to improve the visibility of the bank and its financial products. Despite our efforts, I realized that the realized sales were very few and did not make much impact to the bank’s portfolio. I noted that personal selling strategy was not ideal for the bank since it only reached a small segment of the market (Pride & Ferrell, 2012). As such, I concluded that the bank would require an elaborate marketing strategy to improve sales. The Board of Directors asked me to compile possible strategies that would enable the sales department achieve its mandate. I was determined to prove why personal selling alone was not ideal for the bank. I tabled the results of the study before the Board of Directors. I recommended that the bank overhauls its entire strategy and include advertising in mass media and online marketing. However, the Managing Director of the bank was conservative and determined to maintain the status quo. He argued that the new strategies would increase the cost of sales of the bank, thus

Information and template below Assignment Example | Topics and Well Written Essays - 250 words

Information and template below - Assignment Example The basic reasons that necessitate the division of the market into tiny segments include easier marketing; this simply indicates the fact that it is easier to address the various needs of the smaller groups of consumers, specifically if they have several characteristics that are common (Henry 2011). Further, it helps in finding the niches that simply means that when the un-served or under-served markets are recognized. Segmentation will help Prince Sports be efficient which simply means efficient use of the marketing resources through focusing on some of the best segments for the offering such as promotion, product, place, and price (Kotler, 2009). Prince Sports engages in different activities to reach junior players. It appreciates that all the players have different level abilities and skills. Therefore it markets its products in three distinct segments that include recreational line, performance line, as well as junior line. Prince Sports solved the existing contradiction between sweet spot and racquet speed through the implementation of O technology; but it faced several complexities in converting the technology into racquet with the physical features that would satisfy the needs of the players. Moreover, Prince Sports has its channels of distribution in terms of mass merchants such as Walmart and Target, specialty tennis shops and sporting gods chains. Prince Sports uses different promotional activities currently. Prince Sports focuses on the advertising of its distribution channels and products, online marketing, as well as investing in the teaching programs so as to help consumers understand product information. Inddeed, Prince Sports is actively using social networking sites like facebook, twitter, among others to promote its products. Further, it sponsors over professional tennis players to assist in promoting the products. However, it should be aware of the challenges of technology as it incorporates it

Who will win the Senate election in Montana Essay

Who will win the Senate election in Montana - Essay Example In this forthcoming Montana election, it will be a battle between the incumbent senator Jon Tester and Republican congressman Deny Rehberg. The incumbent Tester was elected in the year 2006 alongside other senators (Books LLC, 2010). Tester was elected during the unpopular contest involving Bush and Cheney. During this time, senator Tester was not widely popular in the state. As such, he only garnered a slim majority of the votes in a contest with Conrad Burns. Although Conrad Burns had a three term service, he was defeated by the incumbent senator Tester. Senator Tester is a moderate politician who has been influential in the Democrat’s politics. As such, he has garnered popularity in the senate, with many democrats liking his tenure in office. He is widely known as a longtime family business farmer with diligence in his working. In addition, he has served in the United States Senate for four terms, which makes him a veteran politician. It is confirmed that in the last term of serving in the United States Senate, he was a residing officer. In 1998, senator Tester was immensely outraged by huge energy rates hiking. This made him outburst in anger to condemn these acts (Norquist & Lott, 2012). As such, this was an inspiration to run for an elective post so as to have a better position in condemning the huge energy rates hikes. Although he has a number of responsibilities, Senator Tester is also part of banking, prestigious appropriations, and homeland security committees. With all these delegations, he is positioned to approach a large number of people in executing his duties. A worthy opponent in Montana senate seat to oppose the incumbent senator Tester is Denny Rehberg. Rehberg is a long serving Congressman with six terms in office. Although he was a sole House of Representatives member, he has been successful in becoming a governor from 1991 to 1997. Rehberg also has been able to serve in the Montana

Colonial Salem, Witch Trials as a quest for power Essay

Colonial Salem, Witch Trials as a quest for power - Essay Example In fact, religion, witches, and Satan may have had less to do with the outcome of the Salem trials than the male/female conflict that permeated the town and the era. Gender attitudes were prescribed by the fundamentalist religion of the time, and religious figures may have had a fear of the women expressing themselves, and a hostility towards their feminist demands. Gender roles and sexism played a key part in the Salem Witch Trials, as the events of 1692 became another chapter in the ongoing struggle that women have confronted in their quest for status, fairness, and justice. Witchcraft has traditionally been stereotyped as the domain of the female gender, as well as being a social construct perpetuated by the dominant male power structure. Witnesses who testified against the witches seemed to "acquiesce in and reinforce theories of witchcraft, developed by theologians and lawyers, which emphasize female weakness—the greater susceptibility of women to temptation; their greater sensual depravity" (Holmes 45). These theories were simply prejudicial stereotypes that had no basis in scientific or social fact. Feminism and gender roles are central to the Salem Witch Trials as they recognize and address the "systems of power and oppression" that existed at the time (Gasser 27). In 1692 Salem, men controlled the political spectrum, only men could vote and hold public office, they were the leaders in the Puritan religion, and owned most of the personal property (Demos 63). These factors would create an environment where women would have few opportunities except to keep their place, not speak out, and acquiesce to male demands. In addition, clinical hysteria was common in the 17th and 18th century when women were denied self-expression and limited in power and status (Hill 22). The charges of witchcraft in 17th century Salem were a manifestation of the womens struggle, and defined as witchcraft only by the male power structure. As the hysteria

Who will win the Senate election in Montana Essay

Who will win the Senate election in Montana - Essay Example In this forthcoming Montana election, it will be a battle between the incumbent senator Jon Tester and Republican congressman Deny Rehberg. The incumbent Tester was elected in the year 2006 alongside other senators (Books LLC, 2010). Tester was elected during the unpopular contest involving Bush and Cheney. During this time, senator Tester was not widely popular in the state. As such, he only garnered a slim majority of the votes in a contest with Conrad Burns. Although Conrad Burns had a three term service, he was defeated by the incumbent senator Tester. Senator Tester is a moderate politician who has been influential in the Democrat’s politics. As such, he has garnered popularity in the senate, with many democrats liking his tenure in office. He is widely known as a longtime family business farmer with diligence in his working. In addition, he has served in the United States Senate for four terms, which makes him a veteran politician. It is confirmed that in the last term of serving in the United States Senate, he was a residing officer. In 1998, senator Tester was immensely outraged by huge energy rates hiking. This made him outburst in anger to condemn these acts (Norquist & Lott, 2012). As such, this was an inspiration to run for an elective post so as to have a better position in condemning the huge energy rates hikes. Although he has a number of responsibilities, Senator Tester is also part of banking, prestigious appropriations, and homeland security committees. With all these delegations, he is positioned to approach a large number of people in executing his duties. A worthy opponent in Montana senate seat to oppose the incumbent senator Tester is Denny Rehberg. Rehberg is a long serving Congressman with six terms in office. Although he was a sole House of Representatives member, he has been successful in becoming a governor from 1991 to 1997. Rehberg also has been able to serve in the Montana

Power Electronics Intensive Solutions Essay Example for Free

Power Electronics Intensive Solutions Essay Abstract—There is a clear trend in the automotive industry to use more electrical systems in order to satisfy the ever-growing ve-hicular load demands. Thus, it is imperative that automotive elec-trical power systems will obviously undergo a drastic change in the next 10–20 years. Currently, the situation in the automotive in-dustry is such that the demands for higher fuel economy and more electric power are driving advanced vehicular power system volt-ages to higher levels. For example, the projected increase in total power demand is estimated to be about three to four times that of the current value. This means that the total future power de-mand of a typical advanced vehicle could roughly reach a value as high as 10 kW. In order to satisfy this huge vehicular load, the ap-proach is to integrate power electronics intensive solutions within advanced vehicular power systems. In view of this fact, this paper aims at reviewing the present situation as well as projected future research and development work of advanced vehicular electrical power systems including those of electric, hybrid electric, and fuel cell vehicles (EVs, HEVs, and FCVs). The paper will first introduce the proposed power system architectures for HEVs and FCVs and will then go on to exhaustively discuss the specific applications of dc/dc and dc/ac power electronic converters in advanced automo-tive power systems. Index Terms—Electric propulsion, electric vehicles (EVs), fuel cell vehicles (FCVs), hybrid electric vehicles (HEVs), internal com-bustion engines, motor drives, power converters, semiconductor devices. I. INTRODUCTION. BY THE time the commercialization of the next-generation car comes around, advanced power electronics and motor drives will have already established themselves as prime compo-nents of advanced vehicular drive trains. Advanced power elec-tronic converters and traction motor drives will be responsible for a major part of the vehicle’s energy usage. As of now, the automotive market is making rapid developments in case of the hybrid electric vehicles (HEVs). Commercially available HEVs include the Toyota Prius, Toyota Highlander Hybrid, Toyota Camry Hybrid, Lexus RX 400 h, Honda Insight, Honda Civic Hybrid, Honda Accord Hybrid, and Ford Escape Hybrid. In the case of future HEVs, power electronic converters and associated motor drives, which control the flow of electrical energy within the HEV power system, promise to be the keys to making HEVs more fuel efficient and emit lower harmful pollutants. Manuscript received March 15, 2005; revised October 26, 2005. Recom-mended by Associate Editor J. Shen. The authors are with Electric Power and Power Electronics Center, Illinois Institute of Technology, Chicago, IL 60616-3793 USA (e-mail: [emailprotected] edu). Digital Object Identifier 10. 1109/TPEL. 2006. 872378 As is well known, in the first half of the past century, the 6-V electrical system in automobiles served the purpose of ignition, cranking, and a satisfying few lighting loads [1]–[5]. Since then, there has been a constant rise in vehicular power requirement. Performance loads, such as electric steering, that were tradition-ally driven by mechanical, pneumatic, and hydraulic systems, are now increasingly being replaced by the electrically driven systems, in order to increase the performance and efficiency of operation. Furthermore, luxury loads have also increased over time, imposing a higher demand of electrical power [3]. It must be pointed out here that the rate of increase of automotive loads is assumed to be about 4% per year. Thus, such load demands have resulted in the need to scale up the onboard vehicular power level. Considering these aspects, several decades ago, the voltage was raised from its earlier 6-V level to the present day 12-V level and, now with an ever-in-creasing demand forecasted into the future, there is a need to switch over to much higher voltage levels of 42 V, 300 V, or higher, as the case may be [3]–[5]. Due to the high voltage levels being produced in HEVs, it becomes essential to have dc/dc converters to supply all the auxiliary loads on board the vehicle. Although the dc/dc converter technology is well devel-oped for low-power applications at lower cost, much work needs to be done for high-power applications. It is an immense chal-lenge to meet all the vehicle standards for electromagnetic in-terference (EMI) and electromagnetic compatibility (EMC) as well as specifications of reliability and packaging [4], [5]. In ad-dition, power electronic converters also dictate how and when fuel/electricity is used in HEVs. A suitable dc/ac inverter draws dc power from the batteries to drive the electric traction motor, which in turn provides power to the wheels. The dc/ac inverter also performs the function of recharging the batteries during re-generative braking in HEVs. Based on this fundamental background, proving the criticality of power electronics for HEV applications, this paper will re-view the role of power electronics and compare the associated advanced power system architectures for HEV as well as electric vehicle (EV) and fuel cell vehicle (FCV) applications. The var-ious design issues for power electronics intensive HEV and FCV power systems and the current and future trends will be high-lighted. In addition, the proposed 42-V PowerNet is also focused upon, emphasizing on the description of its key capabilities and requirements. Furthermore, the paper will also discuss the mild hybrid vehicle, wherein the major opportunities for automotive power electronics are outlined. Finally, few system-level issues 0885-8993/$20. 00  © 2006 IEEE 568IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 3, MAY 2006 Fig. 1. Conventional 14-V dc power system architecture. that drive the relative power electronics size and cost functions will also be addressed. II. CONVENTIONAL AUTOMOTIVE POWER SYSTEMS AND| Fig. 2. Typical representation of the more electric hybrid vehicle power system| | CONCEPT OF MORE ELECTRIC VEHICLES (MEV)| | || architecture. | | During the mid 1950s, the automotive industry decided to| | | opt for 12-V electrical power systems for vehicles, since the| | | then popular 6-V system was rapidly becoming plagued by the| and rear-wheel steering, which will be driven electrically in the| | increasing vehicular load demands. The battery became a six-| future. | | cell module instead of three cells, at approximately the same| As is well documented in related literature, most of the fu-| | energy rating. The electrical system demand had risen from the| ture advanced electric loads require power electronic controls. | | 100 W of the early 1900s to typically about 1 kW by the 1990s,| In advanced future vehicles, power electronics is forecasted to| | as more and more electrically powered devices were installed| perform three major tasks. First task is simple on/off switching| | [6]–[8]. | of loads, which is performed by mechanical switches and relays| | The conventional electrical system in an automobile can| in conventional cars [7]. The second task is to act as a suitable| | essentially be divided into the architectural elements of energy| controller for electric traction motors. Finally, power electronics| | storage, generation, starting, and distribution. The distribution| intensive power systems will not only be used for the obvious| | system of a conventional 14-V power system satisfies vehicular| task of changing system voltage levels, but also for converting| | loads such as, interior/exterior lighting, electric motor driven| electrical power from one form to another, using dc/dc, dc/ac,| | fans/pumps/compressors, and instrumentation subsystems [6]. | and ac/dc converters. | | A simple rendition of the conventional 14-V electric power| As mentioned earlier, due to the ever-increasing electrical| | system architecture is shown in Fig. 1. | loads, the automotive industry is opting for more electric power| | As is clear from Fig. 1, the conventional power system ar-| systems. Due to this, MEVs will need highly reliable and fault-| | rangement has a single 14-V dc voltage level, with the vehic-| tolerant electrical power systems to deliver high quality power| | ular loads being controlled by manual switches and relays. As| from the source to the electrical loads. It is extremely important| | mentioned earlier, the present average power demand in an au-| that the voltage level/form in which power is distributed be taken| | tomobile is approximately 1 kW. The voltage in a 14-V system| care of. A higher voltage will reduce the weight and volume| | actually varies between 9 and 16 V at the battery terminals, de-| of the wiring harness, among several other advantages [7], [8]. | | pending on the alternator output current, battery age, state of| Fig. 2 shows the concept of a future hybrid MEV, making use| | charge, and various other minor factors [6], [7]. This results in| of high voltage (300 V) automotive power system architecture. | | overrating the loads at nominal system voltage. In addition to| Currently, the proposed MEVs are at a transitional stage, in-| | these disadvantages, the present 14-V system cannot handle fu-| volving different systems voltage levels [8]. It is expected that| | ture electrical loads to be introduced in the more electric envi-| the future MEV power systems will most likely be comprised of| | ronment of the future cars, as it would be expensive and ineffi-| a single main voltage bus (high voltage) with a provision for hy-| | cient to do so.| brid (dc and ac), multivoltage level distribution and intelligent| | In more electric vehicles (MEVs), there is a trend toward| energy and load management. | | expanding electrical loads and replacement of mechanical| | | and hydraulic systems with more electrical systems. These| III. ADVANCED DRIVE TRAIN ARRANGEMENTS FOR ELECTRIC,| | loads include lights, pumps, fans, and electric motors for var-| | | | HYBRID ELECTRIC, AND FUEL CELL VEHICLES| | ious functions. In addition, they also include some advanced,| | | | | |electrically assisted vehicular loads, such as power steering,| This section introduces the various drive train arrangements| | air conditioner/compressor, electromechanical valve control,| of pure battery electric vehicles (EV), series/parallel/series-par-| | active suspension/vehicle dynamics, and catalytic converter| allel/complex HEV drive trains, and pure FCV/hybrid FCV| | [6]. Furthermore, additional advanced vehicular loads include,| drive trains. Based on the review done in this section, the| | anti-lock braking, throttle actuation, ride-height adjustment,| ensuing sections will focus on the power electronics intensive| |. EMADI et al. : POWER ELECTRONICS INTENSIVE SOLUTIONS| 569| Fig. 3. Topological arrangement for an electric vehicle (EV) drive train. power system architectures for these advanced drive train arrangements. A. Battery Electric Vehicle (EV) Drive Train Topology A purely electric drive system principally replaces the internal combustion engine (ICE) and the various transmis-sion systems with an all-electric system. As is well known, rechargeable chemical batteries are the traditional option as en-ergy sources for EVs. But they tend to be heavy and expensive to replace over their limited lifetimes. In addition to traditional batteries like lead–acid, nickel metal–hydride (Ni–MH), and nickel–cadmium (Ni–Cd), there are advanced technologies like lithium–polymer (Li-polymer) and lithium–ion (Li–ion) bat-teries. Despite the popularity that these advanced batteries have gained for portable electronic applications, they haven’t quite maintained the same reputation for use in EVs. Most practical EVs still use lead-acid batteries, with the more sophisticated ones using Ni–MH batteries [8], [9]. A basic overview of a battery electric vehicle (BEV) is as shown in Fig. 3. More recently, the automotive industry is cutting back on EV production, and has declared HEVs and FCVs to be the future of advanced vehicle technologies. This is because BEVs cost sig-nificantly more than gasoline vehicles, due to the fact that EV battery modules are currently being produced in very small vol-umes [9]–[11]. Higher vehicle prices are partially offset by the fact that fuel costs for battery electrics are about one-third those of a gasoline-powered vehicle. In addition, BEVs have fewer moving parts than gasoline cars, and hence, require less mainte-nance. The future of battery EVs is somewhat uncertain at this time, but their development has already made important contri-butions to advancing electric drive train and storage technolo-gies needed by both HEVs as well as FCVs [10], [11]. If further breakthroughs in battery technologies occur, BEVs could yet prove to be the future of clean transportation. B. Series HEV Drive Train Topology A series hybrid vehicle is basically an electric vehicle with an on-board battery charger. An ICE is generally run at an optimal efficiency point to drive the generator and charge the propul-sion batteries on-board the vehicle, as shown in Fig. 4. When the state of charge (SOC) of the battery is at a predetermined minimum, the ICE is turned on to charge the battery [12]–[15]. The ICE turns off again when the battery has reached a desir-able maximum SOC. The engine/generator set maintains the battery charge around 65%–75%. It must be noted that, in a se- Fig. 4. Typical layout of a series HEV drive train. Fig. 5. Schematic of a parallel HEV drive train configuration. ries HEV, there is no mechanical connection between the ICE and the chassis. The advantage with the series HEV configuration is that the ICE is running mostly at its optimal combination of speed and torque, thereby, having a low fuel consumption and high effi-ciency. However, there are two energy conversion stages during the transformation of the energy between the ICE and the wheels (ICE/generator and generator/motor) [16], [17]. Some energy is lost because of the two-stage power conversion process. A se-ries hybrid vehicle is more applicable in city driving. C. Parallel HEV Drive Train Topology A hybrid vehicle with the parallel configuration has both the ICE and the traction motor mechanically connected to the trans-mission. A schematic figure of the parallel hybrid is shown in Fig. 5. The vehicle can be driven with the ICE, or the electric motor, or both at the same time and, therefore, it is possible to choose the combination freely to feed the required amount of torque at any given time [18]–[20]. In parallel HEV, there are many ways to configure the use of the ICE and the traction motor. The most widely used strategy is to use the motor alone at low speeds, since it is more efficient than the ICE, and then let the ICE work alone at higher speeds. When only the ICE is in use, the traction motor can function as a generator and charge the battery. A parallel HEV can also have a continuously variable transmission (CVT) instead of a fixed step transmission [19], [20]. With this technique, it is pos-sible to choose the most efficient operating points for the ICE 570IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 3, MAY 2006 Fig. 6. Typical drive train configuration of a series-parallel combined HEV. Fig. 7. Schematic of a complex HEV drive train. at given torque demands freely and continuously. The result is lower fuel consumption due to the inherently more efficient fuel usage. Energy is also saved due to regenerative braking. The advantage with the parallel HEV configuration is that there are fewer energy conversion stages compared to the se-ries HEV and, therefore, a lesser part of the energy is lost [19]. In fact, the parallel HEV drive train depicts fairly lower losses compared to other HEV topologies and, hence, has a compara-tively higher overall drive train efficiency. D. Series-Parallel HEV Drive Train Topology The series-parallel HEV is a combination of the series and parallel hybrids. There is an additional mechanical link between the generator and the electric motor, compared to the series con-figuration, and an additional generator compared to the parallel hybrid, as shown in Fig. 6. With this design, it is possible to com-bine the advantages of both the series and parallel HEV config-urations [20]. It must be highlighted here that the series-parallel HEV is also relatively more complicated and expensive. There are many possible combinations of the ICE and traction motor. Two major classifications can be identified as electric-in-tensive and engine-intensive. The electric-intensive series-par-allel HEV configuration indicates that the electric motor is more active than the ICE for propulsion, whereas, in the engine-inten-sive case, the ICE is more active [20], [21]. A common opera-tive characteristic for both types of series-parallel HEV systems is that the electric motor is used alone at start with ICE turned off. During normal driving, the ICE alone propels the vehicle in the engine-intensive case. On the other hand, the ICE and electric motor propel the vehicle in the electric-intensive case [20]. When acceleration is needed, the electric traction motor is used in combination with the ICE to give extra power in both of the configurations. During braking or deceleration, the trac-tion motor is used as a generator to charge the battery and, in stand still, the ICE can continue to run and drive the generator to charge the battery, if needed. Another form of series-hybrid configuration is shown in Fig. 7, which is a power split HEV topology. This topology includes a planetary gearbox, which connects the ICE, traction motor, and generator. Varying the speed from the two planetary gear pinions, connected to the electric motor and the generator, can control the ICE speed. When the ICE turns off, the vehicle is propelled in the pure electric mode. However, at most of the operating points, the energy flows in a similar fashion to either that of a parallel HEV or to that of a series HEV. In parallel HEV mode, energy flows from ICE via the gearbox to the wheels, whereas, in the series HEV mode of operation, the energy flows from generator and motor to the wheels [21]. The proportion between these two energy flows depends on the overall vehicle speed. Under most operating conditions, this configuration is a combination of series and parallel hybrid vehicle. It is also possible to operate this in parallel mode for some operating conditions. One of the motivating factors for use of the power split HEV topology is to increase the vehicle power capability for a given transmission. This in turn enables the usage of continuously variable transmission concept for light duty HEV propulsion ap-plications, such as pick up trucks and small buses. E. FCV Drive Train Topology. The potential for superior efficiency and zero (or near zero) emissions has long attracted interest to fuel cells as the potential automotive engine of the future. However, systematic efforts to realize the efficiency and emissions benefits of fuel cells in the transportation sector have materialized only in the last 10 years. The overall goal of ongoing fuel cell research and development programs is to develop a fuel cell engine that will give vehicles the range of conventional cars, while attaining environmental benefits comparable to those of battery-powered electric vehi-cles. Although the technology is currently quite expensive, fuel cells offer benefits including high overall efficiency and quiet operation due to few moving parts. A typical fuel cell based propulsion system is shown in Fig. 8. The hydrocarbon fuel such as gasoline, natural gas, methanol, or ethanol is first reformed to obtain the required hydrogen using a reformer (or fuel processor) [22]. This hydrogen rich gas from the reformer is fed to the anode of the fuel cell. It is also possible to store the on-board the vehicle using a pressurized cylinder, instead of using the reformer for con-verting the fuel to -rich gas. The oxygen (or air) is fed in to the cathode fuel cell. Depending on the fuel cell stack configu-ration, and the flow of hydrogen and oxygen, the fuel cell stack produces the dc output voltage [22], [23]. The fuel cell stack EMADI et al. : POWER ELECTRONICS INTENSIVE SOLUTIONS| 571| Fig. 8. Typical topological arrangement of a hybrid fuel cell vehicle drive train. output is fed to the power conditioner (power electronic con-verter) to obtain the required output voltage and current. Ide-ally, the power conditioner must have minimal losses leading to a higher efficiency. Power conditioning efficiencies can typ-ically be higher than 90% [24]. IV. POWER ELECTRONICS INTENSIVE POWER SYSTEM ARCHITECTURES FOR HEVS A. Advanced Electrical Features in Future HEV Technologies As mentioned earlier, there is a trend in the automotive in-dustry to replace more engine driven mechanical and hydraulic loads with electrical loads, due to higher efficiency, safety re-quirements, and driver’s comfort. All of these new functions re-quire the application of power electronics. In most of the cases, the cost of the power electronics dominates the argument of in-troducing such functions. Many of these functions will only ap-pear in concept vehicles in the projected future. Some of these include luxury loads, such as information and entertainment that have received lots of hype recently. The other class of features is -by wire, where â€Å"† stands for an advanced function such as, â€Å"steer† or â€Å"brake. † Another class of advanced electrical features includes power steering pump, electric ac-tive suspension system, electromechanical valve control, elec-trically heated catalytic converter, air-conditioning systems, and water/oil/fuel pumps [25]. There are also other loads such as throttle actuation, ride-height adjustment, rear-wheel steering, which are proposed to be driven electrically in the future. Fig. 9 depicts a summary of some of the future electrical features auto-motive power systems. It is virtually mandatory that most of the proposed future electric loads will indeed require power elec-tronic controls of some sort. B. Advanced HEV Topology Using ISA System In view of research and development work for MEVs, it must be pointed out that one of the leading breakthroughs in the au-tomotive industry is the introduction of the integrated starter-generator (ISG) system for mild HEVs [26]. The ISG is pri-marily an electric machine with a rotor instead of a flywheel mounted on the crankshaft between the ICE and transmission. A schematic diagram of an ISG system used in conjunction with a high-voltage vehicular power system is shown in Fig. 10. The Fig. 9. Future electrical features in more electric vehicle power systems. Fig. 10. Integrated starter-alternator (ISA) based HEV drive train. ISG provides the functions of an electric starter and an alternator [26], [27]. By using suitable advanced power electronic con-verter systems, it is possible for the ISG to compensate the drive train oscillations to provide more comfort. The power electronic converter system controls the ISG operating state, depending on the load status and the battery charge status. Improved fuel economy and reduced emissions are two prime advantages of an ISG system. Using a start/stop cycle, the ICE is turned off during deceleration or after the vehicle comes to a complete stop. The ISG can be used to propel the vehicle from a stop condition (and/or at a set speed), to restart the ICE. The ISG will also be able to route power produced by regenerative braking into the energy storage devices (batteries or ultra-capac-itors) [26], [27]. It can also be used to provide power enhance-ment, when taking off from a stop, or in added acceleration for passing. C. 42-V/12-V Dual-Voltage Vehicular Electrical Systems The 42-V/12-V dual-voltage architecture is being popularly touted as one of the solutions for the ever-increasing in-vehicle load demand. The operating voltage criteria being considered for 42-V systems are shown in Fig. 11. The maximum dynamic over voltage is limited to 58 V, including the transient voltages 572IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 3, MAY 2006 Fig. 11. Typical operating voltage criteria for 42-V HEV power systems. Fig. 13. Schematic of a dual voltage (14 V and 42 V) architecture using one battery. Fig. 12. Schematic of a dual voltage (14 V and 42 V) architecture using two batteries. [28]. In this case, the system charging voltage is set at 42 V. The entire electrical system in the vehicle is run at a nominal value of 42 V, whenever the engine is running. Some of the advantages of such a system include, high efficiency and performance, less expensive operational procedures, reduced total installed power due to the integration of the mechanical and hydraulic power into the electrical power system, and reduction in the overall design complexity. The transition to an entirely 42-V dominated architecture cannot be done immediately. Therefore, it is assumed that a dual voltage automotive power system will exist at least for a while. There are various ways to implement a power electronics intensive dual voltage power system. The schematic used in Fig. 12 illustrates a dual (42 V–14 V) battery system. Fig. 13 shows a schematic using only one single 42-V battery, and Fig. 14 illustrates a structure in which the dual voltage is generated by a single alternator, which has two output voltages. In the dual battery system, the first (36-V) battery is optimized for high power delivery, while the second (12-V) battery is optimized for low powers to support key-off loads plus hazard lamp operation [28], [29]. In other words, in this structure, the starting function will be isolated from the storage function required for â€Å"key-off† loads. This architecture provides oppor-tunities to improve existing high power loads by moving them to the 42-V side. It also minimizes changes to existing 14-V features, like lighting loads. However, this system has two batteries, which when com-pared with today’s one 14-V battery, implies more cost, weight, and packaging space. The other new component in this system is Fig. 14. Schematic of a dual stator dual voltage (14 V and 42 V) architecture using two batteries. the 42-V/14-V dc/dc converter. The overall cost of power elec-tronics is still considered too high for automotive applications. However, power electronic converters are capable of providing seamless energy transfer between two energy storage batteries and help improve reliability of some critical vehicular functions, which require a backup battery. In contrast, the single battery schematic of Fig. 13 is based on the desire to avoid cost, weight, and packaging problems cre-ated by the additional battery. The idea is that the power man-agement system should be smart enough to manage the key-off loads from depleting the high-voltage battery to the point that the vehicle cannot be started [29]. It is critical to point out here that this architecture also uses a bidirectional dc/dc converter be-tween the 42-V and 14-V buses. The schematic shown in Fig. 14 uses a more complicated alternator, with two sets of stator wind-ings, to provide power separately to the 42-V and 14-V buses. In this structure, again, high power loads are connected to the 42-V bus and the 14-V bus supplies low-power electrical mod-ules [29]. In addition to the above-described architectures, there exist many other strategies and variations of dual-voltage automo-tive power systems. The auto industry at this point is stagnant with regards to selecting appropriate dual-voltage MEV archi-tectures. One of the main focal points of research in selecting EMADI et al. : POWER ELECTRONICS INTENSIVE SOLUTIONS a suitable MEV system is to determine which options provide the best economic value to possible customers. The other major concerns with the introduction of 42-V power systems are phys-ical and practical viability aspects, such as arc faults and ensuing fire hazards. These and various other practical issues are dis-cussed in the following section. 1) Practical Issues Related to 42-V Automotive Power Sys-tems: As is apparent, by increasing the present 14-V network to 42-V, significant component and system changes within the vehicle will be necessitated. One of the major motives for this change is because of the nature of faults and their subsequent consequences, due to the higher current carrying wires in a 42-V automotive power system environment. It is obvious that the ten-dency is to produce longer arc faults, which have to be addressed to provide automotive safety. Wires that are semi-cut or scraped, in all probability, cause longer arc faults at higher system volt-ages. Furthermore, various research issues also arise from the point of view of vehicular power electronics and motor drives. For example, by reducing the mild HEV power system operating voltage (from 150 V/300 V to 42 V), the required current to pro-vide the necessary power increases. Thus, this corresponds to the entire winding of the electric traction machine to be restruc-tured. Issues such as heat transfer and protection also require a detailed investigation before the 42-V architecture becomes practicable in the auto industry. On the other hand, power electronic switches in 42-V sys-tems may be required to handle RMS currents in the proximity of about 400 to 500 amps/phase [29]. Currently, in order to switch such high profile currents, parallel-operated power electronic switches are being proposed, since using single-level switches is highly uneconomical. Recently, advanced MOSFET switches have been introduced for use with prototype 42-V automotive power systems. Trench IGBTs have also made noteworthy progress from the point of view of providing 42-V architectural solutions, wherein the research focus is mainly on solving reliability and short-circuit current capability issues. D. Power Electronics Solutions for HEVs Power electronics is an enabling technology for next genera-tion of vehicles, which should be cleaner, smarter, more precise, more efficient, and more flexible. In the past decades, power electronic devices were avoided mainly because of their cost issues. The reasons for increased interest in automotive power electronics can be separated into the ensuing sections. 1) New Architectures: By increasing new electrical loads, cost and complexity of the system is on the increase. Such archi-tectures need new switching and reliability features. Power elec-tronics makes the possibility of integrating switching and fusing functions into one component with higher reliability. Possibility of implementing different control methods on power electronic systems is another reason to go away from relay switching. Also, by implementing integrated sensing techniques in power elec-tronic devices, diagnosis and fault detection becomes easier to implement. Furthermore, development of clean and energy effi-cient vehicles in future vehicle technologies such as EVs, HEVs, 573 and FCVs is not possible without implementing new architec-tures, which are available using power electronics. 2) Power Conversion on Demand: Most of the auxiliary drives in vehicles are designed for worst-case scenarios. Power electronics and motor drive topologies make it easier to have higher efficiency by providing adjustable speed drives. Es-pecially, engine-cooling fans have been designed recently, implementing power electronic controls and adjustable speed drives. 3) Voltage Conversion on Demand: Different components in vehicles need different levels of voltages. Different voltage levels in dual-voltage architecture are available using power electronic converters. Induction or synchronous machines need ac voltages with high power for propulsion, and small motors for fans and pumps require ac voltage with low power [30], [31]. Converting dc-to-ac voltages and dc-to-dc voltages with different voltage levels is not possible without using power elec-tronic converters. 4) Precise Electronic Control: Engine controls such as igni-tion or fuel injection need precise timing and dynamic control of actuators. Fuel injectors should work on very high pressure with more precise opening time. Engine developers are working on systems to replace the camshaft with electronically controlled variable valves, promising up to 25% more fuel economy. These controls cannot be imagined without the use of power elec-tronics. 5.