Acoustical Characterization of Porous Materials for Automotive Research Paper

Acoustical Characterization of Porous Materials for Automotive Application - Research Paper Example There exists diversity when it comes to porous materials either artificial or natural. Sintered, steel wool, perforated materials and fiber metal are among the porous materials that have been increasingly used in automotive noise control. Following the diversity and variety of porous material characteristics, the study of porous media has proved to be wide and interesting. The review begins with outlining and comparing the models that are intended to be used in predicting the fundamental acoustical characteristics that are applicable in automotive. The paper introduces both the theoretical, empirical and numerical modeling and demonstrates how the models are used to determine the acoustic characteristics of porous materials. The analytical models indicate that the solid constituents of porous material are rigid and the fluid constituents are similar to that of a homogenous isotropic fluid that has been modified. The review also considers the acoustical characterization of porous mate rials and goes further to look at the porous materials modeling while having particular interests on porous materials that are elastic. The fundamental characteristics of porous materials are then illustrated using computational and experimental examples . Introduction In automotive, absorptive materials have various applications in different locations. Absorber pads can serve effectively in several locations such as in the door panel, pillar trim, headliner and bellow the carpet. Porous materials like fibers and foams are normally used in such applications. There acoustic characteristics enable them to serve as absorbers. It is the viscous losses that results in the conversion of energy to heat while sound waves navigate through the fibers or pores that are interconnected in the material. A porous material that is bonded with a barrier that is non-porous conducts the sound energy in waves that are in form of structure-borne. The characteristics which have the desirable influence on this wave form are the structural loss and bulk stiffness (Allard, 1993,p. 56). With reference to automotive applications, absorption is preferred at frequencies that are lower while the weight and thickness are to be limited. Porous materials with air flows resistance that are specific yet different have been identified as to achieve the results that are desired. However, the action of decreasing or increasing the given air flow resistance in order to achieve low frequency results affect high frequency performances. The review thus gives a presentation of a number of different material’s studies which illustrate such behavior. Several models such as the penalization approach demonstrate this behavior by simulating fluids inside and porous regions surrounding the obstacle. Such models are easy to implement and do not need a body fitting or a specific interface treatment. The models are successfully used in the introduction of new passive control methods that entail the imple mentation of a porous layer in between the fluid and the blue-body so as to change the characteristics of the boundary layer. Such a passive control model results in regularization that is drastic especially when it comes to high Reynolds numbers (Allard, 1992, p. 3349). Porous materials come in two phases, namely; the fibrous solid component termed as the frame and the interstitial fluid located in the pores resulting from the frame. Following their low density, porous materials cannot be generally used to make barriers but are commonly applied in the making of materials that absorb

The scholarships solution Essay Example | Topics and Well Written Essays - 1250 words

The scholarships solution - Essay Example rights advocates have made unsuccessful efforts to ensure that victims of historical injustices are provided with compensation as a means to show justice and fairness. Their failure has been attributed to the fact that some of these injustices were committed by past governments and the current society finds it quite challenging to carry these burdens. On the other hand, lack of compensation has been attributed to inadequate financial resources as well as biasness in relation to allocation of resources among the affected persons (Torpey, 2003). This document presents a proposed plan that will specifically focus on reparation of the descendants of the Tulsa 1921 Race Riot that occurred in Greenwood. Evidently, the survivors of this riot have not received any form of compensation or justice despite their efforts over the last six decades (america.aljazeera.com). In this regard, the proposal shall offer a framework by, which the descendants of this social menace can be provided with scholarships as a means to compensate their fallen and surviving relatives. It is important to acknowledge that this proposal is not a government or non-government initiative, but rather an institutional initiative that will support 10 students, who have been identified as the descendants of the Tulsa 1921 Race Riots and are in need of financial support to complete their degrees at the University level. The major objective of this reparation plan is to provide support to the descendants of the Tulsa 1921 race riot n terms of scholarship for their university degrees. The scholarship program is expected to cover ten students, who have been identified and confirmed as direct descendants of the riots. There are some survivors of the riot that are still alive and they have been contacted regarding this issue; they have appreciated this efforts and are willing to provide any form of advice in case it will be needed. This will be an appropriate way to address the injustices that were faced by

Theory Analysis - Watson's Theory of Human Care Research Paper

Theory Analysis - Watson's Theory of Human Care - Research Paper Example History The Watson’s Theory of Human Care had started taking its form through the evolution of philosophies of Dr. Jean Watson. In 1979 she gave the concept of 10 carative factors of nursing. Since then her theories have undergone several changes, though the salient framework of the theories have remained consistent. The factors mentioned above were based on philosophy, science and the art of caring. Later the concept developed into the idea of clinical caritas meaning the cherishing and appreciating the job and mixed love with the idea of nursing. The concepts were reviewed by the author from time to time in 1985 and again in 1988. She also emphasized on the development of interpersonal help and trust and relationship of care. In 1999 Watson developed the Transpersonal Caring Relation. In this theory she highlighted the potential of the connection that the nurse can establish to care and heal the patient. She also speaks of the subjective concern of the nurse for the patient (Cara, n.d.; Alligood, Marriner-Tomey, 2006, 103-104). Meaning Watson in his Theory of Human Care has emphasized on the connection of the nurse with the patient to build a relationship based on care. For a nurse, she has emphasized on a few qualities like the inclination of the nurse to acknowledge the importance of the patient, the capacity of the nurse to establish a spiritual connection with the patient so that she can feel an union with her patient and to give her patient a comfort to so that his inner healing is promoted. The theory is based on the love and compassion of the nurse. However she has pointed that in the healing process the primary agent is the patient himself and the nurse is a copartner. She has emphasized on a number of factors for the healing of the patient. They are the humane and the altruistic values, the faith and hope of oneself, sensitiveness to others as well as oneself, a relation based on help and trust, free expression of positive and negative emotion s, a creativity to solve the problems in the caring process, transpersonal gains through mutual teaching and learning. The other factors that she has outlines are a social and spiritual environment that supports and protects the patient’s ability to heal the physical and mental state. The factors are based on spiritual as well as existentialist and phenomenological powers (Watson, 1999, p 73 – 75; Butts, Rich, 2010, p 286-287). Use Watson gives an outline of the ethics and morale associated with learning. According to Cara (n.d.) the profession of nursing is slowly losing its goal of caring for the patients and Watson’s theory tries to reinstate that fact. Moreover she emphasizes on the powers of the soul of the patient to help in the healing process and gives a direction to the nurses assist the patient in this process of healing. In this way Watson gives subjectivity to the profession on nursing based on caring that can be applied by all the nurses (Alligood, & Marriner-Tomey, 2006, 103-114; Cara, n.d.). Logical Adequacy In the theory Watson outlines the discipline of nursing based on philosophy. Here the subjective choices of the nurse and the ontological capabilities are of extreme importance. Watson does not denounce the capability of medicines or doctors for the healing of the patient. However she emphasizes the role a nurse can play to help the process. Therefore Watson’s theory of Human Care cannot be refuted based on logical derivations. Generalizabilty Watson’

Legislative Analysis Essay Example | Topics and Well Written Essays - 1000 words

Legislative Analysis - Essay Example 2454, The American Clean Energy and Security Act of 2009, which establishes a federal cap-and-trade program to reduce GHG emissions (Key Provisions for Climate Legislation). GHG Emission the United States of America produces and emits a significant portion of GHG and helps developing Global warming throughout the world. It is estimated that of the total energy use Homes account for about 35% of the potential efficiency gains while the industrial sector accounts for 40% and the commercial sector 25%. Of the total emission of GHG in USA, California emits a robust figure of GHG. California produces roughly 1.4 percent of the world's and 6.2 percent of the total U.S., greenhouse gases (California Climate Change Portal). The state has been working on and finding solutions of impacts towards people due to climate since 1988. The executive order of 2005 issued by Arnold Schwarzenegger on climate change kicked into high gear to further advance clean renewable energy and other solutions to lower our state's greenhouse gas (GHG) emissions. Again, most importantly, the California Global Warming Solutions Act of 2006 established the first-in-the-world comprehensive program of regulatory and market mechanisms to achieve real, quantifiable, cost-effective reductions of GHG. Provision has also been framed to prevent the unscrupulous trend of the polluters. To this end, the Act reveals that Polluters would balance out some of their emissions by purchasing carbon "offsets," which are official certificates that greenhouse gas emissions have been avoided or taken out of the air The provision of setting up a New Clean Energy Deployment Administration is certainly a wise decision to monitor and improve the overall situation. Recommendations and Concluding Remarks The biggest opportunity to improve US energy situation is a major investment program to make homes and businesses more efficient. An investment of $520 billion in improvements like sealing products and replacing inefficient appliances could produce $1.2 trillion in savings on energy bills by 2020(Galbraith, 2009). If such a program can be carried out over the next decade, the country could save around 23 % of total energy use. However, to improve the existing situation further notice on the Act and undertaking following actions are necessary. The Senator/ Government should rightly consider about the Act so that U.S. climate policy become successful in both reducing GHG emissions and addressing the cost concerns of consumers. Efforts should also be made so that framing necessary legislation is possible that reduces GHG emissions 80 percent below current emissions levels by 2050, while providing strong, effective consumer-protection measures to help reduce electricity price increases as we transition to a low-carbon future. Provisions should be made to allocate emissions allowancesto the electric power sector that will help toreduce price increases to all electricity customers-large and small, rural, urban, and suburban-without compromising environmental gains. Again, necessary steps should be undertaken to provide some allowances to that Merchant coal generators to help mitigate price increases in wholesale electricity markets. There is nothing denying that setting reasonable and

Virgin Holidays Essay Example | Topics and Well Written Essays - 4000 words

Virgin Holidays - Essay Example In addition to this the company has an established ski programme, known as the Virgin Snow and also Taste of Adventure product range. New destinations were also added in the year 2007 which basically consists of Malaysia and also Mauritius. In 2008 Virgin Holidays acquired the assets and also the brand name of the Travel City Direct from the XL Leisure Group, which was collapsed in the year 2009. The Travel City website has now been re launched along with a Virgin Holidays style design and layout. Since its creation the Virgin Holidays has gone from the strength to strength. The company thus now offers an extensive selection of the holidays to mainland USA, Florida, Canada, Caribbean and also to South Africa. In addition to this a well-established programme has also been developed in order to make this service the better one. Virgin holiday is also known as one of the best part or area with the help of which one can enjoy and can easily spend the time. The rates are different for dif ferent occasions. If you really want to enjoy then you can visit and can also book your flight with the Virgin holidays and can enjoy your holidays. It is also marked as one of the best holiday operators all over the world. One can gain as much benefit as much he/she wants from this service. Discounts are also being offered and you can avail much more discounts too. Virgin Holidays is basically meant for tourists and people can acquire as much as they can and as much as they want. As mentioned earlier Virgin holidays is working along with other facilities too for instance Virgin air lines, Virgin mobiles and many more and this is the main reason that how and why Virgin holidays has became the best one. (Trawicky & Gregory, 311) When working in any company or in any organization, different kind of problems occurs and therefore different solutions are also

A Roman Revolution Essay Example for Free

A Roman Revolution Essay It was May 30, 1347.  Ã‚   The city was once at the center of the world, and varying nations vied to pay homage.  Ã‚   Since that time, however, its institutions, its buildings, and its very name seem to have been forgotten by time.  Ã‚   Local nobility compete for control while the rest of the populace starved, and banditry thrived.  Ã‚   The religious shrines and public buildings were dilapidated, and worn out from neglect.   From this one day, however, and from one such ruin, issued a declaration from a man who stirred hope in people’s breast.   Ã‚   Cola di Rienzo, who in the course of time would ambitiously set himself up as a virtual dictator in the city, at that moment declared the restitution of the Roman Republic, to the cheers of an excited throng.  Ã‚   The restless crowd seemed far disconnected from the reality of a Holy Roman Empire, independent Italian city-states, Norman and Spanish sovereignty in the south, or the hundred more kingdoms and treaties that kept Italy divided and the Republic from becoming reality, but no one cared.   A brief, tragic drama began to unfold, taking hold of the city and its dreamer alike.  Ã‚   For a few months, the Roman Republic seemed to breathe life and its Dictator Rienzo came close to uniting Italy.  Ã‚   The smaller city-states and principalities all sent their delegations and intentions to forming a loose federation with Rome.  Ã‚   And the Dictator put ambitious reforms and decrees, which championed the cause of the people.   His pride, however, got the better of him, and he soon alienated the senators and the Church.  Ã‚   The senators amassed armies against him, and the Pope called to the people to reject him.  Ã‚   Having lost all his allies, he fled the city, wandering Italy to find people to rally for his cause.   Ã‚  Dejected, beaten, his spirit finally broken, he surrendered to the Pope in Avignon, and was allowed to return to Rome where the people could not long stomach his disillusionment and killed him as a traitor[1].   This brief Roman Revolution was an early experiment of that age to attempt the reconstitution of an age that seemed lost in time.  Ã‚   The people of the Renaissance, from the artisan to the poet, was fascinated with ancient Greek traditions and culture and created works of art that mimicked Classic styles.  Ã‚   Ancient texts were gathered from the libraries where it was copied and preserved, and crude attempts at translation were made to introduce these historical artifacts to the world.  Ã‚   Most of the entire Renaissance was electrified at the thought of the old â€Å"heroic† Roman Republic, and the Caesars and Ciceros that once walked the Forum.   In due course, this paper would seek to identify the sources of the ideology behind the Italian Renaissance’s fascination with the ancient Greco-Roman, and how it seemed to suit their needs.  Ã‚   The paper will then explain the various attempts to reconstitute the past in the present, and how close they were in succeeding.    Once more, a Roman World   The thought of a restored Rome was not unique to Renaissance thought.  Ã‚   Even as the western portion of the empire collapsed under the pressure of barbarian migrations, the eastern emperor Justinian drafted ambitious plans of gaining back the lost lands of Gaul, Italy, Spain and Africa. This having failed, the Frankish kings, and later the German emperors, stylized themselves as Caesars that had legitimacy given to them by the authority of the Pope and the acquiescence of the eastern emperor.   Italian dreams of Rome, however, had political and cultural context.   They loathed the plain ugliness of Gothic and barbarian architecture, and largely preserved the Roman tradition and culture.   They lamented Italian as a bastardized form of Latin, and deplored Dante’s use of the former as the vernacular. Italian writers, at the beginning of the Renaissance, began to collect ancient texts from faraway libraries[2].  Ã‚   Petrarch, the Father of the Renaissance, was the first of the writers to amass Greek and Latin texts, and encouraged a fellow writer, Boccaccio, to pore into Greek research.   Unique also in the Renaissance, was the way the ancient texts were interpreted. In the medieval ages, the various ancient works of art were interpreted in Christian context.  Ã‚   Pagan ideals and traditions were explained with a Christian theme. Thus, a Hercules-like figure would be used to represent Christ.  Ã‚   The Renaissance began to separate the contemporary Christian thought from the ancient texts, and began to appreciate the latter in their historical context. They read into classical texts their appropriate classical meaning; they did not allegorize Latin writings as one to justify medieval Christian Europe, but in the context of ancient Rome[3].   The thought of a united Italy was sometimes reconciled with the restoration of the ancient Greco-Roman tradition.   Ã‚  Rienzo certainly thought of this when he donned the garb of the old senatorial toga and declared the return of the Roman Republic. Petrarch saw it when he asked King Charles IV of Bohemia to unite all of Italy[4], and many might have seen it when the son Alexander VI, Cesare Borgia, began a long campaign to win back much of the lost cities of the Papal States.   Conclusion: Historical Myopia   For all the dreams and ideals of the Renaissance Italians, a Roman Republic could not be reconstituted from 14th to 15th century Europe.  Ã‚   The Holy Roman Empire, primarily, would not stand for a united Italy outside of their control or power, as they would, and have claimed, Italy as an integral part of the empire. Neither, however, can the Holy Roman emperors be able to unite Italy, as they become too embroiled in disputes with the Pope, who has nominal sway over the Italian city-states.  Ã‚   And the Popes, for all their universal spiritual authority, would not be able to wrest control of all of Italy from powerful independent Italian city-states, the Normans and the Spanish, the Germans and the French, and even the Greeks until their collapse in the latter half of the 15th century.   The Italian Renaissance sought to reintroduce ancient Greco-Roman thought into the mainstream, envisioning a past that was nobly glorious.  Ã‚   Several hundred years brings distance and unreality to history, even when taken from historical context.   The Italian city-states of the Renaissance was freer in practice with its people than the ancient Roman Republic, which countless times brought down reformer tribunes, and curbed attempts to relieve the proletariat in keeping the wealthy in their state.  Ã‚   The ancient Roman Empire was less free as the centuries passed, and its economy was in nightmarish shambles, a thought that the Renaissance Italians might have shuddered at.   In the end, the Renaissance Italians might have fallen in the same way their medieval counterparts have: to see the ancient culture in their contemporary values.   Certainly the Renaissance wanted to detach itself from the â€Å"barbarism† and disunity, which seemed to plague Europe, but the reforms of a Rienzo would have shocked the ancient Roman aristocracy, and Byzantine intrigue would be far closer to Roman court morals than the Renaissance Italian sensibilities.   A final word must be said of the Renaissance dream: in the 16th century, one man came closest to uniting Italy and much of Christendom under a loose â€Å"Roman empire†.  Ã‚   Politics and religion, in the end, got in the way, and Charles V of the Hapsburg dynasty and his successors would find himself humbled by an alliance of French, Turks, Protestants and even the Pope[5]. BIBLIOGRAPHY References Durant, Will. The Renaissance. New York: Simon and Schuster, 1953. Durant, Will, Caesar and Christ. New York: Simon and Schuster, 1935. Rice, Eugene Jr., The Foundations of Early Modern Europe, 1460-1559. New York: W.W. Norton and Company,1971. Krailsheimer, A.J., The Continental Renaissance: 1500-1600. Middlesex: Penguin Books, 1970. [1] Durant, Will, The Renaissance (New York: Simon and Schuster, 1953) 16-21. [2] Durant, Will, The Renaissance (New York: Simon and Schuster, 1953) 67-69. [3] Rice, Eugene Jr., The Foundations of Early Modern Europe, 1460-1559 (New York: W.W. Norton and Company, 1970) 72-76. [4] Durant, Will, The Renaissance (New York: Simon and Schuster, 1953) 46. [5] Krailsheimer, A.J.,   The Continental Renaissance: 1500-1600 (Middlesex: Penguin Books, 1971) 93-98.

Political Communication Concepts

Political Communication Concepts The term political communication has proved to be continually difficult to define with any decisions since both components of the phrase are open to a variety definitions, more or less broad. Communication is and always been a central component in political processes whether it is leaders communicating with the public, candidates competing for votes, combatants struggling for international attention and sympathy, or citizens debating public issues  [1]  . Classic definition of political communication focus on the source and motivation, political communication flows out from the political sphere and must have a political aims. Nevertheless, such definition would not be completely suitable for many of modern sate, particularly given the role of media. Therefore modern texts focus on three on three actors, some of whom operate beyond the boundaries of any singe state, each of whom produce political communication  [2]  . These are: the political sphere itself (they communicate their actions to the society in order to gain legitimacy), secondly non-state actors where we would include a range of organizations with political motivations as well as corporate bodies and the voters  [3]  . Each of these actors communicate message into the political sphere, in hope of having an influence on public life. Finally media which communicate about politics, and influence both: the public as well as political scene. Within the free and pluralis tic societies each of these communicates independently in the same time cooperates with one another. Denton and Woodrow for example provide one definition of political communication as: Pure discussion about the allocations of public resources, official authority, and official sanctions  [4]  . Above definition covers verbal and written political rhetoric, but not symbolic communicates acts, that are extremely important for an understanding of the political process as a whole. The American writer Doris Graber develops a more wide-spread definition of what she terms political language, suggesting that it compromises not only rhetoric but paralinguistic signs such as: body language, and political acts such as boycotts and protests  [5]  . It is necessary to characterize the political communication also through the terms of intension of its senders to influence the political environment. According to Brian McNairn the intentionality of political communication should be simply defined as purposeful communication about politics  [6]  . The scope of such a definition includes: Forms of communication undertaken by political dissidents for the purpose of achieving specific objectives; Communication that is addressed to these actors by non-politicians ( citizens, journalists, and so on); Communication about these actors and their actions, which are contained in the various forms of media. In this case we cannot explore only verbal or written statements, but also visual means of signification (dress, haircut, make-up, outfit) that constitute a political image. The scope of political communication: The problem of political communications directs the attention towards the relationship between three main elements of it by which political communication is initiated and achieved : Political organizations (definition of it) they may seek to do this by attaining institutional, to influence the decision-making process The audience The media Non- elective organisations: Pressure groups, bussines sector, public organistains, terrorist groups Elective political officials : president, prime minister, national and local government, political parties Media (broadcast and print) Public citizens and voters Source: Key concepts in political communication. How communications is made may vary and how audible the message is can be upon the size of any group or level of support for a party, group or cause and the tactics used to get the messages across. In a pluralistic society all groups will communicate among themselves and between one another and will be both learning from and competing with one another. The greater the number of voices competing, the more intense the competition, the better communication groups must be in order to be heard. Thus, we hear about professionalization of political communication, that it has become better in some way in order to be heard by more groups and individuals. The process by which political communication is carried out has evolved, become more technically and technologically sophisticated. (6) and adopted techniques from the world of corporate advertising and marketing in order to compete in the modern information-rich society. Previously form of direct or non-mediated political communication involved public meetings in church halls, cinemas and other places, political campaigns. Such meetings are now few and mainly limited to countries where technology does not allow for the message to be directly to homes  [7]  . Largely, political communication has become an activity aimed at a mass audience using the mass media of television. Direct political communication has become less of a feature in recent elections. As communication technology allowed mass communication, this phenomenon increasingly changed. Mass media not only chose what to broadcast as news but also pick the way it portrays groups in society. Political communication has then moved from being a direct, personal, face to face activity to being conducted indirectly via the mass media of mass communication  [8]  . Changes in communication technology inevitably have a significant influence in all of these areas. The ability to predict the direction, forms, intensity of them is very limited. Consider the example of the proliferation of the internet, that is one of the most spectacular technological developments of the last decades, the internet first represented the revolution for democracy. Citizens and groups have greater access t o political information than ever before which in turn rises the ability to distribute information, views, images, and sounds around the worldà ¢Ã¢â€š ¬Ã‚ ¦ Everyone with a computer can become a mass medium  [9]  . The three ages in political communication Blumler and Kavanaugh 1999- the first age took place before the start of television when the primary communication channels were strong and stable political institutions such as political parties. In the second age focus shifted to passing on messages through the mass media and increased the demand for communication professionals who were adept at exploiting these channels. In the third still emerging, age of media, the professionalization of political communication becomes even more pronounced. Political actors find themselves attempting to send messages through the multitude of channels of each of which has its own set of demands and formats,