Super Heterodyne Receiver Essay Example | Topics and Well Written Essays - 1000 words

Super Heterodyne Receiver - Essay Example All modern television and radio receivers virtually use the principle of super heterodyne. The super heterodyne receiver reduces to the same intermediate frequency value. In order to accomplish this, it requires that the super heterodyne receiver be able to vary incessantly the frequency that is being mixed into the signal in order to keep the same difference (Jerry 1172). This paper will discuss Super Heterodyne Receiver and its various aspects. History The history of Super Heterodyne Receiver can be traced back to 1905 when Reginald Fessenden, a Canadian inventor, described proposed method to produce an audible signal from an Alexanderson transmitter. However, Edwin Armstrong, a United States Major, devised the principle of super heterodyne receiver in 1918 during the First World War in France. Armstrong invented this device as a way to overcome the deficiencies of early vacuum tube triodes that were being used as high-frequency amplifiers particularly in radio (Drentea 38). These amplifiers were used in equipment for radio direction finding and Armstrong realized that if these receivers could be operated at a much higher frequency, they would be better and more effective. At that time, however, there were no practical short wave amplifiers because of the existing limitations of triodes. Before Armstrong’s invention, it had been noticed that if regenerative receivers were allowed to move into oscillation, it would be possible for other nearby receivers to start picking up stations on frequencies that were different from those that were actually being transmitted on by stations. Several years later, Armstrong deduced that this was as a result of a supersonic heterodyne that was between oscillator frequency and the carrier frequency of the station (Jerry 1173). Therefore, Armstrong realized that that super heterodyne was a potential solution to the amplification problem of short wave. For example, he realized that to monitor 1500 kHz frequency could requ ire setting up an oscillator at 1560 kHz, therefore producing a heterodyne difference of 60 kHz; such a frequency could then be amplified more conveniently by the day’s triodes (Tsui 79). Eventually, Armstrong sold his patent for super heterodyne to Westinghouse, who in turn sold to RCA. RCA later monopolized the super heterodyne receivers market until 1930. Super heterodyne receivers gained more prominence in the 1930s with vacuum tube technology improvements. This situation could also be attributed to the rapid increase in the number of broadcasting stations that created demand for higher-performance and cheaper receivers. Introduction of tubes particularly designed for operation of super heterodyne receivers, notably the pentagrid converter, significantly reduced the advantage that preceding receiver designs had. Commercial production of super heterodyne receivers by the mid-1930s largely replaced the production and use of preceding receivers designs specifically tuned rad io frequency receivers. Eventually, the principle of super heterodyne was virtually taken up for all commercial TV and radio designs (Drentea 102). Design and Operation Principle of Super Heterodyne Receiver The operation principle of super heterodyne receiver mainly relies on the use of frequency mixing or heterodyning. The signal from an antenna is adequately filtered to reject the image frequency (Tsui 90).

If It's Legal, It's Ethical; and Besides, Everyone Does It Essay

If It's Legal, It's Ethical; and Besides, Everyone Does It - Essay Example Group hedge-fund, Raj Rajaratnam obtained inside information through supporting the graduation parties of several young executives in major companies such as Intel. Arthur Anderson and Credit Suisse First Boston Corporation (CSFB) shredded documents that would be crucial in pending Enron investigations. The outcomes of such behaviours were costly legal suits by the SEC, loss of investor confidence in the industry (Jennings, 2012). Other executives were sentenced for long terms in jail. There are no disadvantages competitively if companies do not engage in the same behaviours as those of the industry. Companies that behave ethically will attain higher reputation and trust from clients thus gaining a competitive edge in the market. If firms do not follow the unethical industry behaviours, they will avoid costly suits by the SEC and gain market reputation (Jennings, 2012). Some of the negative consequences for companies that adopted industry practices include costly suits by the SEC, loss of investor confidence and bankruptcy. Such companies distorted the market prices and led to decline in the market capitalization since some investors sold their stocks below the issue prices in order to avoid further losses. If everyone in the industry is behaving unethically, it will not be difficult for one to be caught. The Securities and Exchange Commission constantly monitors the transactions of each financial identity after complaints of insider trading thus facilitating the identification of criminal and unethical behaviours. On the other hand, the SEC requires the suspected individuals to voluntarily assist in the investigation in order to qualify for leniency in the exchange of the insider trading and market manipulation testimony (Jennings,

Accounting project Essay Example | Topics and Well Written Essays - 1000 words

Accounting project - Essay Example The strategy shifted sales from the future periods to the current quarter. In addition, the approach assumed a gross profit on the future sales, which resulted in the inflation of the earnings in 1997. Therefore based on the company-adopted strategy, Dunlap accelerated the company’s revenues by 18 percent. The management had adopted this plan to improve the stock prices, which would have resulted from good earnings reports presented by the company (Sondhi, & Taub, 2008). The increase in stock prices would assist in the acquisition of debt financing for the merging process. The bill and hold strategy adopted by the company provided incentives to the customers to make purchases whose delivery and billing was to happen in the future. The customers were not expected to pay for the goods until when the goods were delivered. Actual payments of the current period sales occurred in the preceding quarters. Therefore, the sales were recorded in the books of accounts as accounts receivables resulting in the increase of the accounts receivables expected by the company. The company avoided a significant shortfall in revenues, therefore, the continued using the bill and hold strategy in the preceding quarters. In this case income was not recognised at the point of sale rather it was recognised immediately the customer accepted the bill and hold conditions. Revenue may be earned during a period, but it is usually recognised at a point to fulfil the revenue recognition criteria, which is satisfied at the point of product delivery. Based on this revenue is recorded when there is certainty of the cash being received. Based on sunbeam’s case record of 1998 quarter first revenues were recorded in 1997 due to the fraudulent bill and hold strategy that they had adopted (Sondhi, & Taub, 2008). The sales revenue acquired in the first quarter of 1998 was used to offset futures that the company had borrowed to satisfy the bill and hold

Procedures or Methods Research Paper Example | Topics and Well Written Essays - 750 words

Procedures or Methods - Research Paper Example The researcher requires a platform for explaining reasons behind the collected data. The researcher has to develop guidelines that help collect the reasons behind the results during the research process. This involves the formulation of causal explanations that justify the collected information. Beneficial ways of identifying and carrying out a research depend on the researcher’s intimate understanding of the issue to be studied. This is enhanced during the design process where the researcher gets some background information on the issue. The NCLB law was enacted to give children with disabilities equal education opportunities with their counterparts without disabilities (Baker, 2010). The research design process begins with identifying the aim of the research. In this case, the researcher would be interested in finding out the benefits of NCLB and how the children have benefited so far. Some scholars consider NCLB law to contradict with the initial IDEA law that protects indi viduals with disabilities (Baker, 2010). The researcher may include the effects of the two laws in protecting people with disabilities. The teachers and state education heads have developed educational interventions in order to comply with NCLB requirements and meet the required student performance. The results and failures of the strategies can be included in the aims of the research. The second step is to formulate the research questions that completely address the aims of the research (Bynner and Stribley, 2010). These questions shed light on the benefits of NCLB and the effects it has created in the education system. The research questions are: Where would Special Needs children be educationally without No Child Left Behind? What impact has NCLB created among children with disabilities? What strategies have been formulated by the education board and what effects have they introduced in the curriculum? What issues make the implementation of NCLB difficult and what are the resourc es involved in the implementation process? The third step is to design the research paradigm or theoretical framework. The framework provides a guiding structure and range of tool that will help the researcher answer the research questions. This research would require a positivistic method of collecting data like interviewing students with disabilities, parents, teachers, and curriculum developers (Mitchell and Jolley, 2012). Questionnaires would also be helpful in collecting quantitative data on the subject. The questionnaires would be distributed to various schools within the state. They would have sections to be filled by students, teachers and their parents. These would increase the sampling area by minimizing the effort used when conducting interviews. The students would provide data on the effects of NCLB on their education process. The teachers would provide information regarding the effects of the law on the curriculum and the cumulative effects on the education process for students. Parents would also provide information regarding student performance and perceived benefits introduced by the law. The curriculum developers or education officials in the state offices would provide information regarding the effects of the law on curriculum development and the challenges faced when implementing the guidelines. The questionnaires would also involve questions dealing with the benefits of NCLB on the students, the impact in the education

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

Heroes - Essay Example Martin Luther and Nelson Mandela are some of the world’s best heroes because they changed the world around them in a significant way. A hero can be defined as a person who contributes significantly and positively towards social, political, or economic discourse in a society. Heroes are identified by a strong sense of discipline in all aspects of life as well as a strong stand to their beliefs. One overarching characteristic of a hero is the ability to sacrifice personal comfort, interests, and even life for the sake of the community. Most of the world’s recognized heroes have indeed gone through a lot of painful experiences, jail terms, and even tortured as they sought to fight for the community. For instance, Nelson Mandela was jailed for 27 years as he fought against apartheid in South Africa. Martin Luther is globally recognized for his fight for civil rights for African Americans in U.S. However, Luther chose to use nonviolent means to achieve his objectives of securing equal rights for all people in America. Luther was at the forefront leading protests against workers mistreatment at Memphis Sanitation. The blacks working for Memphis sanitation were poorly paid and their merge salaries delayed and at times not even paid. Luther was able to organize a non violent protest lasting more than two months (â€Å"Martin Luther King,† 2014). On a different light, Luther led a successful non-violent protest against Montgomery bus company for segregating against blacks from sitting in front seats. However, Luther’s epitome moments are perhaps tied to his maiden speech dubbed â€Å"I Have a Dream.† (â€Å"BBC†, 2015). With over 200, 000 followers, Luther unleashed this maiden speech pushing the congress to pass the laws regarding civil rights for the bl acks in America. The swearing in of Barrack Obama as the first Black president in America indeed marked a significant milestone for Martin Luther as a hero in U.S and the rest of the world. However, on the

Crucible Analyzing John Proctor Essay Example for Free

Crucible Analyzing John Proctor Essay Analyzing John Proctor as a Tragic Hero In the Crucible, a play by Arthur Miller, John Proctor is the tragic hero. A tragic hero is defined as someone who has great courage that ends up dying at the end of the story. The reason John Proctor is the tragic hero of this play is because he has so much to lose. John Proctor fulfills my requirements of a tragic hero throughout the play. He decides to go to court and expose the girls. The girls turn on him and he gets accused. He is only trying to do well, but gets falsely accused. John Proctor is also a very intelligent man who can detect others as being fraudulent, however he questions his own moral. He questions himself because of his affair with Abigail which was his only flaw throughout the play. In spite of this I still consider him an honorable man. Another thing he did was save his wife from being put to death, and also refusing to confess practicing witchcraft. He proves he is a tragic hero when he explains to the judge that since he gave his soul to leave his name. With this plea, Proctor has eliminated all hopes of living and has established himself as the tragic hero. John Proctor is a man of sufficient stature in that he is given the choice to save himself at the end of the play, but does not. He does keep his affair secretive, but that is only thing that made him seem like the villain. He did not deserve to die at the end of the play, but that is one of the requirements to make him considered a tragic hero. Proctor serves as the voice of justice in the play. He came out and told everyone about Abigail falsely accusing others of being witches. He also came out and ripped the warrant and told the men to leave. In the end, he comes close to confessing being a witch but realizes it disgraces his good name, which is all his children will know him by. The issues leading to John Proctors death are not universal. I believe that he should not have been the one getting the punishment in the end, but that is why he is the tragic hero. Throughout the play he was a man of integrity and nobleness. He confessed to practicing witchcraft, in which he really  didnt. This is why he died; saving his wife from death.

Continuous Development Of Modern Media Technology Media Essay

Continuous Development Of Modern Media Technology Media Essay With the continuous development of modern media technology, constantly updated means of communication and increasingly rich forms of communication, mass media almost always affects people in all aspects of life. In current society, a variety of communications activities has become indispensable in our lives. As an example, the radio program Mars on Earth reported in 1938, which led to huge panic in the United States adequately illustrated this point. TV, newspapers, online news, and radio stations and other news media access to information are now the most important source of information for people to understand the social. Media as an integral part of life, its coverage means often affects the publics mood, and the report of peoples point of view often leads the trend of public opinion. While the continuous spread of important information for the audience, the media is also instilling the relevant concept to audience in a subtle way, in order to affects our attitude, and thus to some extent, to change our view of the world. Just as C. Wright Mills stated that Media not only give us information, they guide our very experiences. This paper will make a detailed analysis of the social function of the media, first introduced the media function in the information dissemination, and discusses the media as information channel for people to provide services. Then this paper will analyze in which way the media influence peoples attitudes, behaviors and experiences. 2.0 The social function of the media The news media is part of the whole social system, which is responsible for reporting the development of the whole society and change, recording the process of the functioning of society bit by bit, with has social information dissemination, public opinion, social supervision and cultural heritage features. In all above, information dissemination is the most basic function of the media, and it has been undertaking to pass true and accurate social information, as well as the task of passing the first-hand information to the audience. Through continually providing a large number of reports of the social events, media transfers flow of information about the surrounding environment, transportation, culture, news, financial market to the public, and also a variety of impending disaster has occurred or, threats and other information to meet their needs. (Bryant Oliver, 2009) In addition to the basic functions of information dissemination, media also has social supervision, education and guidance functions. This paper focuses on the social function of how media guides peoples behavior. 3.0 Means by which media guide peoples experience 3.1 Media decides the content and intensity of information dissemination by news selection There are many large and small event happen every day in the world, reporters choose what to report and what not to have set the window limits for the mass audience, and the scope of the subject of discussion. (Deephouse, 2000) The media measures whether the incident should be reported and how they are reported by a certain news value, in which the fresh of news and timeliness are the key criteria. The fierce ratings competition between media makes the journalists must be ready to face tight time pressure; they all hope to make exclusive reports and starting the news. (Lengel Trevino, 1987) When a hot topic in the head, the media will rush to chase stories, all television, newspaper layout with large, a lot of time around the same topic, it is important to create the atmosphere. But soon, when the subject lost its news value, it will completely disappear in the media. The chase of timely news brings urgent pressure of time, so that media workers have difficulties to do in-depth coverage of events. The media led the public to focus a particular issue, it will also lead us quickly forget the subject. 3.2 To guide the public emotions through different ways of media coverage Press report is easy to influence the publics perception of news events, and lead us to a particular point of view to understand the event. The news media report implied social customs, ethics, philosophy, personality temperament and other news elements of influence and control human emotions more and more apparent. (Scannell, 1992) For example, media report to specific geographical coverage and the spread of video content, due to re-process or phenomenon and not only focus on its nature, to live lives of such people would deepen the misunderstanding of people and things, the tendency of these people and events to be rendering, and thus have a negative impact on the public: not only will affect the groups feelings, but also affects the positioning. Medias role is to help us to transcend personal experience of life constraints, let us know what is happening in other corners. News reporting should be objective and fair. But each persons perception of the world derived from the individuals life experience, according to different backgrounds, social status, gender, ethnic group, different people present for the same facts, is bound to see a different face, resulting in different interpretations, no one can remove the view or values . Of course, media are no exception. The integration of these differences in the news becomes emotional and cognitive impact of a factor to people. 3.3 The development of new technologies creates more possibilities for the media influence on people Television reports which allow people to the text provided in the newspaper and sound provided by broadcast, itll also see a real vivid picture. TV news focuses on visual effects, even if not shooting pictures, television stations often use computer graphics showing the incident, manufacturing, and shot in the visual. These impressive images are easy to be trusted by people, so television has more social control force than other media. In addition, the way to receive information from television is mostly passive, television is relatively weak selective information, which more seriously confined the scope of access to information sources of the audience. In todays information society, media pluralism has been formed. In the press, radio, television and other media followed by a fourth media Internet. (Edwards, 1998) The rapid development of new media provides more extensive information on the public. (Couldry Curran, 2003) 3.4 advertising leadS tendency of the media coverage Advertising is the greatest sense aggressors of modern society and the strongest message implants. As an advertising vehicle of the release of advertising, the tremendous impact on the news media brought by the advertising is inevitable. As we all know, at present, the news media advertising is still the most important publishing platform. News and advertising co-exist on one platform, to contradictions and problems inevitably arise. (Schewe, 2004)As social and economic development, the role of advertising is growing. It passes the information to promote economic development in goods but also to both the media and advertisers to create huge economic interests. In the interests of the stimulation, the media coverage will inevitably have a certain bias. Media on corporate image, product performance, marketing activities and other information for publicity, this practice is called soft ads by some media, and is called hidden advertising by advertisers. For ordinary consumers, these practices are very deceptive in nature. This appears to news is actually a style advertising openly in the news section, so unknown to the audience and may mislead them to believe. 4. How peoples experience be guided by media 4.1 Reconstruction of social values through public opinion Opinion is the most controversial social life events have a certain tendency to published comments, opinions and views. As a common psychological tendency of public opinion, it is hidden in the depths of peoples thinking, through the social assessment with value judgments, such as a specific values or behavior of the praise and admiration or criticism and condemnation, resulting in a social atmosphere, to have an impact on the values and behavior of the community Members. With members of the broad impact on society, public opinion has become an important means of cultural control, and the control system in modern society has an important position. Through the role of public opinion, on the one hand, the mass media will be the legislative branch and public administration institutions to develop, promulgate laws, decrees made public, called on people to adhere to the existing social norms, while the mass media to spread the people values, beliefs and life behavior in order to guide public choice to establish a correct outlook on life and behavior; on the other hand, public opinion and mass media will call through the network, television, radio, newspapers and other channels back to the social ruling, prompting the legislature and public regulatory bodies to consider the public demand, the existing legal and institutional system to adjust and improve, and continuously improve its administrative capacity to maintain social stability and social order. Thus, there is the formation of mainstream social values, although it is not mandatory like the law, it generally widespread impact on peoples thinking and behavior as an invisible constraint. 4.2 To change the publics lifestyle and spending habits Mass media treats guide as a starting point, using its powerful propaganda to make people happy in leisure reading among accepted the new consumption patterns and lifestyles, (Morris Ogan, 1996) which gave birth to consumer culture. The shopping information published in the Newspaper also makes people change their attitudes in consumer. Which stores have recently engaged in activities, what brand, price number, price information, etc. Which pharmacies, we reported on the exchange received from these messages, and compare, go consumption. Difference with the elderly is that, young people read newspapers are concerned about the strong style of entertainment news and employment information. Some people also go through the information reported on the drivers, waiters, security and other jobs. From that point on, the mass media, consumer culture and consumption in the formation of lifestyle play a conspiracy role. 4.3 News reports of crime and violence have a tremendous impact on people With the development of society, media attention on political related events has gone from a single broadened to a variety of criminal phenomena, showing a trend of diversification. With the strengthening of public opinion functions, the number of news reports of crime and weight has been significantly improved, which strongly shocked criminals, and demonstrate the power of the rule of law. (Thoman, 2010) Media is keen to report crime and the main reason is that crime news concerns the audience easily and access to them more attractive. Crime news reports often have twists and turns of the plot, as well as the color of violence, it has more stimulating and entertaining elements than the other news stories. The authenticity of news reports also makes it depicts the victims of crime, especially violent crime, to bring serious consequences, more than the literary fiction film and television has more power to shock. Driven by the economic interests, news reports of crime is inevitably some distortion of the real social phenomenon: excessive rendering of malignant cases, highlighting the cruel circumstances, the disclosure of personal privacy and other related personnel cases. Violation of implied theory believes that exposure to aggressive stimuli may increase a persons motivation level of physical and emotional. In other words, the content of news violence can increase aggressive behavior stimulation occur. In some cases, aggressive characters in the news will give them a role model. Which can be seen, the mass media violence and the proliferation of pornography are often imperceptible to the audiences behavior and way of life tend to have a negative impact on these effects if left unchecked, it is possible to induce the production of deviant behavior. Elizabeth (2010) said that, Many blame media for the rise in violence, but of course thats not the whole storyà ¢Ã¢â€š ¬Ã‚ ¦ Some of the details of this connection might be questioned But the fact that a connection exists is hard to dispute. Which leads us to an inescapable conclusion: Something must be done. The media should adopt accurate news reports of crime, so the audience can keep abreast of the latest social facts of the crime, ease because it caused an unknown number of tension, suspicion, rumors and other negative emotions have to create a good environment for punishing evil and promote good. 5. Summary Since the 20th century, mass media has had a profound impact on peoples lives. The newspapers, books, radio, television, communications satellites and the Internet all represented the modern media space, which makes the whole world a small village. In the aspect of time, the whole community culture and communication network system stay in the same structure, which enables human to enjoy the same important information at the same time, so that all ethnic and cultural exchanges and interaction between real world. The news media with modern sense has become the dominant mode of existence of a culture in modern society the news media culture. Media culture on the psychological characteristics, behavioral structure, attitudes toward other aspects have had a significant effect on the contemporary human life form, content and even ways of thinking have changed dramatically along. With the in-depth of news media era, mass media plays in contemporary society, not only to transmit information, provide entertainment and other social functions, but also changing peoples values and way of life, shaping the social and public life. It continually to provide a series of community-oriented public values and colors to create a highly popular media discourse system, the media text is also increasingly becoming an important form of the modern spirit of the consumer. As a result, the news media become a pervasive cultural existence for its coverage of the large community and huge influence on people in modern society. The news media refers to mass media culture as a carrier; to the media of expression is the basic characteristic of modern society, a cultural phenomenon unique. Either as channels for the dissemination of information, or acts to guide the public, news media should be fully aware of their responsibility, (Curran Seaton, 2003) and try to make it fair and make contribute to sound development for the community. (2109 words)