Wireless systems Research Paper Example | Topics and Well Written Essays - 1750 words

Wireless systems - Research Paper Example In last couples of decade’s wireless communications, systems along with their applications and underlying technologies are among the most active area of development and enjoy the fastest growth in history. The rapid development in this regards has turned the world into a global village (Prassad, and Ruggieri 2). Basic Building Blocks/Components of Wireless Systems Since wireless communication involves number of technologies and their applications hence similar to wired communication there exist a wide range of equipment’s (both at transmitter and receiver ends) to execute communication task by propagating light or radio waves through a medium. However in border sense a wireless system consists of following primary network components. a) Users- The users of a wireless system can be anything including human beings. The users can be mobile or stationary. The basic function of a user is to initiate and terminate the use of a wireless network, making the term end-user approp riate. b) Client- The second major primary component of a wireless network is a computer device designed according to specific need, generally termed as a client. A client works on certain operating systems like as Windows XP, LINUX, or MAC OS etc. Similar to a user a client can be mobile or stationary. For mobile support applications, client devices are generally small and handy (fig.1) with display and keyboard along with a battery power backup (Geier 37). Fig.1 Wireless Devices c) Network Interface Card- Network interface card (NIC) provides an interface between a network device and a wireless network. Depending on requirements, NIC can be a part of a client or as external network adaptor as shown in fig.2. Wireless NICs are designed to meet certain form factors like Industry-Standard Architecture (ISA), Fig. 2 NICs Peripheral Component certain form factors like Industry-Standard Architecture (ISA), Peripheral Component Interconnect (PCI) and PC Card etc. These factors actually d efine the physical and electrical bus interface that enables the card to act as a bridge to carry communication between a computer device and wireless network (Geier 38). d) Medium- A wireless system uses a medium like air to propagate its signals (radio or light waves) from sender to receiver. Various modulation schemes like amplitude modulation (AM), frequency modulation (FM) and phase modulation (PM) are used to propagate the signal over long distances (Kennedy, and Davis 3). Wireless Systems The development of various wireless systems is a wide area of present day research. Following is a brief overview of current wireless systems. a) Cellular- Cellular wireless communication comprising 1G (AMPS, IS-41, ETACS) 2G (USDC-IS136, GSM, CDMA-IS-95), 2.5G (CDPD, GPRS, EDGE, CDMA1-IS-95B), 3G (TDS-CDMA, CDMA2000 1X, 2X) and futuristically the 4G networks is the major contributor of wireless cellular systems (Li 19). b) Private Mobile Radio- The private mobile radio (PMR) is another impo rtant category of wireless systems. Analog, digital, mesh and emerging technologies including cognitive radio and software defined radio (SDR) are important categories of private mobile wireless

Working Conditions Assignment Example | Topics and Well Written Essays - 500 words

Working Conditions - Assignment Example The usual theme is having cigarettes adds masculinity to men and attract more women. It can be linked to social bonds. Some examples of songs depicting cigarettes are My Cigarette and I, Smoke Rings, Smokin’ in the Boys’ Room, Pass that Peace Pipe and many more. The songs appealed to the mass that caused the increasing popularity of cigarettes way before the billboard advertisements like Joe Camel and Marlboro Man (Cooper and Haney, 1999). It is not only used as a status symbol because of its medical uses. In the form of powder, aqueous solution, ointment and extracts, tobacco was then used to treat tetanus, lack jaw, oedema, spastic dysuria, neurosis, constipation, smoke enemas and arsenic poisoning (Haustein and Groneberg, 2010). Despite of the popularity of cigarette and tobacco, it remains a public health enemy number one because it is the leading cause of death in the United States. Consuming cigarettes causes several diseases like cardiovascular diseases, cancer of the lungs, respiratory ailments such as bronchitis and emphysema and other forms of cancer like laryngeal, oral and stomach cancers (Schneider, 2011). In line with the negative health effects of cigarette smoking, several efforts had already been done in the United States. In 1971 the tobacco ads had been banned by the Congress along the airways while in 1984 the Smoking Education Act had been passed together with four strongly worded cigarette warnings in advertisements and cigarette packages. In 1986 the Comprehensive Smokeless Tobacco Health Education Act had been passed (Pampel, 2009). Since then California is the state that adapted some specific measures to manage the risk of cigarette smoking then followed by New York in 2003. The smoking law in New York was signed by Coy. George E. Pataki which includes many strict measures but with exemptions like licensed cigar bars in New York City, America-Indian-owned

The importance of the Stock Market to the Economy

The importance of the Stock Market to the Economy The stock market is an important part of the economy because it organizes the resources and channels them to useful investments, in order to perform this role it must have proper association with the economy. Capital markets are important elements of a modern market based economic system as they give out the channel for flow of long term financial resources from the savers to the borrowers of capital. Stock prices of oil sector have been considered for the study. It is the most growing and important part of the stock exchange because its prices are deeply affected by the macroeconomic variables. Investor of Pakistan who invests for long term and short run will get benefit from this research. According to most of the past studies which conducted on this topic shows that macroeconomic variables which include interest rate and exchange rate directly impact on the stock prices if any changes take place in them it will directly going to affect the stock price. Macro economic variables are inversely related to the stock price. In markets, investors provide long term funds in exchange for long term financial assets offered by borrowers. The stock exchange is an important part of any country in the sense that it organizes domestic resources and channels them to productive investments. However, for this purpose it must have important association with the economy. Capital markets are main elements of a modern market based economic system as they serve as the channel for flow of long term financial resources from the savers of capital to the borrowers of capital. Efficient capital markets are essential for economic growth. With increasing globalization of economies, the worldwide capital markets are also becoming increasingly incorporated, while such integration is constructive for global economic growth. Hussainey Ngoc (2009) examined the effect of macroeconomic variables on Ghana Stock Exchange. They found that macroeconomic indicators such as lending rates and the inflation rate affect on stock market performance. Their results suggested that macroeconomic indicators should be considered for investors in developing economies. This motivates us to examine the degree to which this conclusion is applicable to another emerging stock market in Viet Nam. Huberman Zhenyu (2005) investigated that market embrace both the new issues by primary market and secondary market. Such securities might be raised in an organized market such as the Stock Exchange. As a marketplace where securities include stocks, bonds and shares are bought and sold openly with relative ease, the stock exchange is very important to the investors. The existence of a stock exchange in a capital market helps to broaden the share possession of a company and evenly distribute the nations wealth by making it possible for people in different locations to own shares in a firm in another location by purchasing the shares, bond stock through the simple mechanism of the stock market. Kandir (2008) investigated the linkage between stock price and macro economic variables for some developing countries in Eastern Asia which examined the impact of macroeconomic risks on the equity market of the Philippines stock exchange. Findings show that financial fluctuations in exchange rate and political changes on owners of Philippine equities cannot be able to explain Philippine stock returns. Mohammad et el. (2009) investigated that Karachi stock exchange is largest and most active stock market in Pakistan, accounting for 65% to 70 % of the value of the country total stock transaction as on October 1, 2004, 663 companies were listed with market capitalization $23.23 billion having listed capital of us $ 6.59 billion. Pakistans industrial exports and foreign investment today are growing at the countrys fastest rate ever. The countrys foreign exchange reserves skyrocketed to $12327.9 million in 2003-04 from $2279.2 million in 1998-99. Similarly, several Pakistani stocks are now traded on international markets. Also, foreign brokerage houses are now being allowed through joint ventures with Pakistani investment bankers to participate in primary as well as secondary markets in Pakistan. The stock exchange is not only crucial but also central to the entire mobilization process. This is because it offers an opportunity for continuous trading in securities. The purpose is to examine the impact of the macroeconomic variables which includes interest and exchange rates on the stock prices of oil sector by using regression analysis. Seven year data of both dependent variable and independent variables has been used to determine the result. The macroeconomic variables would provide more information about the stock return economic activity relationship. This would also consider other firm characteristics in order to obtain a better insight about the return generation process. Chapter two consists of literature review where as chapter three consist of methodology and chapter four consists of results interpretations. Chapter 2: Literature review Roll Ross (1980) suggested that the arbitrage pricing theory is suitable alternative because it agrees perfectly on what appears to be perception behind a capital asset pricing model. The arbitrage pricing theory is based on the linear return and generating process at the first principle which require no utility assumption. It is also not restricted to a single period. This theory is applicable in both multi period and single period cases. Arbitrage pricing theory begins with an assumption based on return generating process. There are two major differences between arbitrage pricing theory and capital asset pricing theory, first arbitrage pricing theory allows more then one generating factors. Secondly arbitrage pricing theory demonstrates that any market equilibrium must be consistent with no arbitrage profit, every equilibrium will be characterized by a linear relationship between each asset expected return and its return response. After determination of the factors in asset returns other than the market returns, the arbitrage pricing theory was introduced in order to determine the association between variables used in the study, arbitrage pricing theory stated the use of variables without the need of pre specification of variables but it did not take too long before the criticisms to appear. One foremost criticism was that, the arbitrage pricing theory can not be able to specify the factors, but just explain them statistically. This inefficiency of the arbitrage pricing theory was established even in the first empirical arbitrage pricing theory study. Ammer (1993) investigated the empirical relation between macro economic variables and stock prices in ten different countries, with a main objective is to find a links between these vaiables. The stock price decomposition is used to find the ways through which negative stock prices is associated with a positive inflation which is because of decrease in dividends and increase in real equity returns. Ammer (1993) observed in the results that generally increase in the rate of macro economic variables are directly linked with decrease in dividends and also decrease in required real equity returns. This favors the corporate tax related theories in which any change in the tax related systems affect on an increase in the rate of inflation this helps the firm in raising their cost of their capital relative to the return that has been earned by investors in the firm. Ammer (1993) investigated that In the United States (US) and the United Kingdom (UK) the suggestion of the arbitrage pricing theory model with a conditionally heteroscedastic economic factor imply that macro economic variables may increased the average amount of capital. Kaul (1995) suggested the impact of changes in monetary policy regimes, expected macro economic variables and there impacts on stock prices. Post war evidence from four countries reveals a direct link between these relations and the central banks operating targets which include money supply, interest rates and exchange rates. Specifically, the post war opposing relation has been found between stock price and in expected macro economic variables are significantly stronger during interest rate regimes. Bonomo Garcia (1997) investigated a version of the conditional capital asset pricing model with respect to a local market portfolio, which provides alternative by the Brazilian stock index during the period of 1976 to 1992. For this purpose they had selected conditional arbitrage pricing theory model by using the difference between the 30 days rate and the overnight rate as a second factor in addition to the market portfolio in order to capture the large inflation risk present during this period. Bonomo Garcia (1997) used conditional capital asset pricing model and arbitrage pricing theory models in the formation of the portfolio that consist of twenty five securities exchanged on the Brazilian market, this played an important role for the appropriate pricing of the portfolios. It has been examined that the unconditional moments of the returns series for the stock market index taken from the IFC Emerging markets data base it shows an average return in US dollars of 21.15% and an average excess return in local currency of 28.82%. For industrialized countries standards, it has been observed that these returns are exceptionally high. According to the fundamental asset pricing models such as the capital asset pricing model or the arbitrage pricing theory considered that, high expected returns getting from the security are linked with high measures of risk with respect to a number of risk factors that are going to affect directly on market portfolio. According to the capital asset pricing model, the expected return getting from the portfolio of assets is because of the covariance of the portfolio return which consists of different securities from exchange with the market portfolio return. It has been examined that the while selecting any market portfolio Two different views can be undertaken: it has been considered that the Brazilian stock market is divided into different segmented and concentrate on local risk factors which consist of macroeconomic variables that help in explaining local returns of the stocks, another way to adopt the perspective is that, international investors diversifying their portfolios worldwide by investing their funds into different market of the world in order to reduce the risk from their portfolio because if they invest in only one market with out diversifying in this way risk is high because if decline in market takes place then the investor will directly going to suffer loss on investment. Bonomo Garcia (1997) examined that they adopt the view according to which the Brazilian stock market is divided and tests a description of the conditional capital asset pricing model with reverence to a limited market portfolio, characterized by the Brazilian stock index in the IFC database. The conditional capital asset pricing model is experienced on a set of size portfolios produced from a total of twenty five securities exchanged on the Brazilian markets. The IFC emerging markets data base of the World Bank provides data on stock prices and other financial variables for both the stock index and individual stocks in a series of rising and newly industrialized countries. The Brazilian stock market is subjected by individual investors. They characterize investors in the market with minute investment knowledge or experience, they speculate in the stock market in the absence of market experience. Stocks are often bought and sold on historical prices and on market news about stock pri ces, resulting in stock market mania. Bonomo Garcia (1997) selected the total list of twenty five common shares which were listed on the brazilian stock exchange from January 1976 to December 1992. To test this model the return on individual securities has been selected, but for the purpose of getting linear result they have limit the number of variables used in this process. Bonomo Garcia (1997) examined the degree of the covariance parameters which is small in absolute value but small in variance of the surplus return. The betas of the second and third portfolios got negative values in the outline followed by their magnitudes, which increases with the capitalization value. This specifies the hight of worth portfolios which offers the best hedge against the risk. It should be seen that, by adding a second factor, all the market portfolio betas becomes lower as compare with others portfolios. Altay (2003) suggested that a range of macroeconomic variables representing the essential indicators of an economy are employed in the factor analysis processes and factor realizations of principal economic phenomena. Arbitrage pricing theory has a serious disadvantage in defining systematic risk factors. In contrast to the Arbitrage pricing theory, the market portfolio as the only risk factor in the capital asset pricing model is clearly defined. Asset prices are supposed to respond to series of macro economic procedures. A number of macroeconomic alteration influence asset prices stronger than others and some do not even influence them at all. One of the most well known Arbitrage pricing theory tests on this topic was implemented and measured by a number of important economic variables to have systematic influence on asset returns. Arbitrage pricing theory is only focused on shaping the number of risk factors that systematically give details about the stock market returns by formulating factor analysis methods. Altay (2003) have chosen five factors from the New York stock exchange and AMEX which depend on the period length and the size of the stock groups under examination. In this paper they put into practice empirical analysis to both German and Turkish stock markets and economic data. It shows that Germany and Turkey are both European countries with dissimilar levels of economic development. There are numerous earlier empirical results of the Arbitrage pricing theory for the German and Turkish Stock Markets. Monthly returns of ninety three assets are put into practice, the principle components analysis method are used in order to test the arbitrage pricing theory. The accomplishment of the maximum likelihood factor analysis method used some macroeconomic variables as possible common risk factors in the analysis. The asset prices are supposed to respond to macroeconomic factors and unexpected changes in macroeconomic factors are estimated to be rewarded in stock markets. The factor structures of the German and Turkish economy are presented by employing the same eight macroeconomic variables and stock market proxies in the principle mechanism and maximum likelihood factor analysis. In each type of analysis of German variables, four factors are extracted while only three variables are derived from Turkish variables, representing dissimilar factor structures of these two economies. Javed Aziz (2005) suggested the development of financial equilibrium asset pricing models which has been the most significant area of research in current financial theory. These models are broadly tested for the development of the market. The strength of the Arbitrage Pricing Theory (APT) model on returns from twenty five aggressively trading stocks in Karachi Stock Exchange using monthly data from January 1997 to December 2003 had been examined. Arbitrage pricing theory suggested that there are a number of sources of risk in the economy that cannot be eliminated. Javed Aziz (2005) considered in relation to economy wide factors such as inflation, interest rate, exchange rate and changes in aggregate output. Instead of calculating a single beta, like the capital asset pricing model, arbitrage pricing theory calculates several betas by estimating the importance of an assets return to changes in each factor. The arbitrage pricing theory assumes that a security return is a linear function. The arbitrage pricing theory thus specified that the risk premium for an asset is connected to the risk premium for each factor and that as the assets sensitivity to each factor increases, its risk premium will increase as well. The arbitrage pricing theory forecast that the prices of all sensitive assets in the economy conformed to the condition of no arbitrage. No arbitrage indicate that an individual investment in a well diversified portfolio could not receive any additional return merely by altering the weights of the assets incorporated in the portfolio, holding equally systematic and unsystematic risk constant. The arbitrage pricing theory stated that there is a set of fundamental sources that influence all stocks returns. The stock return is a linear function of a certain number of economic factors, while these factors are unnoticeable and not significant. In order to test the arbitrage pricing theory empirically, following approach has been used. It can simultaneously calculate approximately the asset sensitivities and unknown factors by examining factor analysis on stock returns. On the other hand, it identifies previous general factors that give details about the pricing in the stock market. Such macroeconomic variables can be those affecting either future cash flows on companies or future risk adjusted discount rates. These selected twenty four stocks are the most active stocks with just about 80% weight of aggregate market capitalization of KSE 100 index companies. In order to analyze the stability of the factors in the arbitrage pricing theory, the period is divided into two sub periods; monthly data had been selected for the purpose of examination. The schedule are reported approximately daily by the news media. The outcome specify that in the whole sample period only two priced factors are found to have exploratory factor analysis approach; in the first sub period none of the factors seems to be priced, and in the second sub period they discovered only one priced factor at the 5% level of significance. The number of priced factors seems to be very low and the consequences of this approach specify considerable instability of the explanatory power of the arbitrage pricing theory. The results of two different testing methods for the arbitrage pricing theory are nearly in the identical manner because in the whole sample period two priced factors are found. This is an encouraging result, which supports the theory. But the number of priced factors seems to be very low and the results of this approach point towards substantial instability of the explanatory power of the arbitrage pricing theory. The arbitrage pricing theory is an alternative for the Capital Asset Pricing Model in this way both shows a relation between assets returns and their covariance with other variables, where as capital asset pricing model focuses on the covariance of the market portfolio return. Huberman and Zhenyu (2005) suggested that the arbitrage pricing theory entails a procedure to identify at least some features of the underlying factor structure. Merely stating that some collection of portfolios (or even a single portfolio) is mean variance efficient relative to the mean variance frontier spanned by the existing assets does not constitute a test of the arbitrage pricing theory, because one can always find a mean variance efficient portfolio. Consequently, as a test of the arbitrage pricing theory it is not sufficient to merely show that a set of factor portfolios satisfies the relation between the return and its covariance with the factors portfolios. Gunsel Cukur (2007) investigated the performance of the Arbitrage Pricing Theory (APT) in London Stock Exchange for the period of 1980-1993 as monthly. The arbitrage pricing theory introduced by CRR (1986) involves identifying the macroeconomic variables which directly impact on stock returns. Thus macroeconomic behavior influence the returns on stocks and utilizing macro variables in the return generating process provided a basis to approximate stock returns. The simplest of theories of pricing a financial asset is by discounting future cash flows. Hence, the following exogenous variables that affect the future cash flows or the risk adjusted discount rate of a company must be measured. The reason is to recognize the macroeconomic forces that influence the stock market. For this purpose seven economic variables are examined. The model is designed in a way to test the two conditions. These conditions are economic conditions such as term structure of interest rate, inflation, money supply, the exchange rate, the risk premium and industry specific conditions, dividend yield and industrial production. Their result suggests that share prices are affected in a different manner than one described in CRR. This can be explained by the idea that other explanatory variable may be at work in UK or the CRR methodology is inadequate. They suggested that, interest rate, inflation and money supply were among the factors that are found to be significant. However, in this case unexpected inflation seems to be insignificant. Humpe Macmillan (2007) investigated the relationship between stock market and a series of different macroeconomic and financial variables through out the stock markets over a range of different time horizons. Presented financial economic theory proposes a number of models that gives a structure for the examination of this association. Arbitrage pricing theory is a one way of linking macroeconomic variables to the stock market where different kind of risk factors which affect market in a different ways can give details about asset returns. The early investigations related to arbitrage pricing theory focused on individual security returns, where as it may also be used in a cumulative stock market structure. In this way any changes in a given macroeconomic variable could be seen as reflecting a change in an underlying systematic risk factor influencing future returns. Many of the past empirical studies based on arbitrage pricing theory that links the state of the macro economy to stock market returns, are characterized by modeling a short run relationship between macroeconomic variables and the stock price in terms of first differences, assuming trend stationary. These papers found a significant relationship between stock market prices and changes in macroeconomic variables. An alternative, but not inconsistent, approach is the discounted cash flow or present value model. This model relates the stock price to future expected cash flows and the future discount rate of these cash flows. All macroeconomic factors that influence future expected cash flows or the discount rate by which these cash flows are discounted should have an influence on the stock price. This showed that long term moving average of earnings predicts dividends and the ratio of this earnings variable to current stock price is powerful in predicting stock returns over several years. The only negative coefficients are found on long term interest rates. Additionally, it has been examined that Europe an stock markets are highly integrated with that of Germany and also found that industrial production, stock prices and short term rates in Germany positively influence returns on other European stock markets (namely France, Italy, Netherlands, Switzerland and the UK). Humpe Macmillan (2007) draw upon theory and existing empirical work as a motivation to select a number of macroeconomic variables that might expect to be strongly related to the real stock price. They make use of these variables, in a co integration model, to compare and contrast the stock markets in the US and Japan. The aim is to examined whether the same model can explain the US and Japanese stock market while yielding consistent factor loadings. This might be highly relevant to private investors, pension funds and governments, as many long term investors base their investment in equities on the assumption that corporate cash flows should grow in line with the economy, given either a constant or slowly moving discount rate. Unanticipated inflation may directly influence real stock prices negatively through unexpected changes in the price level. Inflation uncertainty may also affect the discount rate thus reducing the present value of future corporate cash flows. Tursoy, Gunsel, Rjoub (2008) suggested that the reason of this study is empirically test the arbitrage pricing theory in Istanbul Stock Exchange for the period of February 2001 up to September 2005 on monthly base. The arbitrage pricing theory is a theoretical substitute to the capital asset pricing model which analyzed the strength of the arbitrage pricing theory in the US securities market. They used US macroeconomic variables as proxies for the underlying risk factors driving stock returns. Tursoy, Gunsel, Rjoub (2008) found that several of these macroeconomic variables to be important in explaining expected stock return, particularly in industrial production, changes in risk premium, and twist in the yield curve. Tursoy, Gunsel, Rjoub (2008) analyzed the empirical applicability of the arbitrage pricing theory is to price the Istanbul Stock Market, and to recognize the set of macroeconomic variables which communicate more closely with the stock market factors. There are list macroeconomic variables which were used to price the stock of Istanbul Stock Exchange which formed in eleven portfolios from the industrial sector because it represents the important segment of the traded stocks which consists of 174 out of 259 totally traded stocks. A higher index is reflected in higher values of these three variables, therefore, this indicates greater pressure on the exchange market depending on the nature of the involvement of the respective Central Bank. That is, speculative pressures are either accommodated by a loss of reserves or can be prevented by the monetary authorities through an increase in interest rates. Each portfolio may influence different industry in different manner by macroeconomic variables; a macroeconomic factor may affect one industry positively, but affect the other industry negatively. The regression results specify that there is no significant pricing relation between the stock return and the tested macroeconomic variables. This indicates that other macroeconomic factors affect the stock return in Istanbul Stock exchange or the multifactor arbitrage pricing theory with macroeconomic variables fails to explain the effect in stock market. The consequence found that there is no relationship between the macroeconomic variables and stock market return. Kandir (2008) suggested that by make use of statistical tools like factor analysis, arbitrage pricing theory provide guidance in the use of variables without the requirement of pre specification of variables but it did not take too long before the criticism to appear. One most important criticism was that, arbitrage pricing theory cant be able to properly explain the variables which are used in the study, but just derive them statistically. This insufficiency of the arbitrage pricing theory continues that the result obtained from factor analysis should be primary economic variables, such as gross national product (GNP) or interest rates. Additionally, in this paper they acknowledge that stock prices and stock returns are systematically affected by economic variables. For this purpose they have selected the data from July 1997 to June 2005 in order to analyze there impact. Their findings of suggested that there has been a significant relation between Macroeconomic factors and stock return in the countries examined. Kandir (2008) recommended that the examination of major economic factors that are alternate of the derived factors in the arbitrage pricing theory which is the first to employ specific macroeconomic factors as proxies for undefined variables in the arbitrage pricing theory. Expected dividends of a company can be directly affected because of increase in inflation rate, real production, oil prices and consumption. The new model has an explicit advantage over the arbitrage pricing theory. There is no theoretical framework for the selection of macroeconomic variables. Stock prices are found to share positive long-run relationships with industrial production and consumer price index. Whereas result they obtained has found to have a negative relation with money supply, interest rate and exchange rate. Kazi (2009) identified the significant risk factors for the Australian stock market by applying co integration technique. It is Relevant to previously used variables, which act as a substitute for Australian systematic risk factors. The linear combination of previous variables is found co integrated although not all variables are significant. The bank interest rate, corporate profitability, dividend yield, industrial production and, to a lesser extent, global market influence are significant for the Australian stock market returns in the long-run; while the stock prices are used in each quarter by its own market presentation, interest rate and global stock market arrangements of previous quarter. The sensible implications for both local and overseas investors as all investors now able to direct their investment risks better while considering Australian stocks into their portfolios through monitoring only 4 to 5 factors that are identified here. The relationship between kibor rates and stock prices of oil sector from the viewpoint of asset portfolio allotment is commonly negative. An increase in interest rates raises the necessary rate of return, which in turn inversely affects the value of the asset. Measured as opportunity cost, the nominal interest rate affects investors decision on stock holdings. A rise in the opportunity cost may, however encourage investors to find a substitute shares for other assets. Using co integration technique this paper performs an empirical analysis to identify the significant risk factors for the Australian stock market. In doing so it examines whether or not the selected a previous variables can give details about the return generating and pricing process of the Australian stock market. The results are in conformity with the current finance theory, yet interestingly different on some points. In long run, it is found that the Australian stock market prices are being influenced by only 4 or 5 systematic risk factors. Nguyen (2010) examined the stock price performance of an emerging stock market the Stock Exchange of Thailand, by applying a new equilibrium stock price theory. They have chosen the data for assessment during financial crises. The theory recommend stock market risks and returns are determined by essentials under a linear relationship recognized on the basis of a consistent multi factor model return generating process and the assumptions of perfectly aggressive and frictionless markets. The literature on asset pricing models has taken on original lease of life since the appearance of the Arbitrage Pricing Theory, is substitute theory to the renowned Capital Asset Pricing Model (CAPM). Being motivating in its own right the arbitrage pricing theory soon concerned a number of main financial economists and researchers which had yielded its several affect on different researches. The methodology for testing the strength of the capital asset pricing model can be functional for testing the weight of arbitrage pricing theory. The two pass test measures are applied in almost every test of the arbitrage pricing theory. The study on certain macroeconomic forces which are going to systematically affect the stock returns of certain stocks. Their result suggests industrial production; changes in a default risk premium, term structure, and unanticipated inflati

emergence of the internet Essay -- essays research papers

The Internet and the emergence of the Internet news media are affecting the delivery of media content. Many argue that the traditional media is changing the way they report the news. Internet news sites are also affecting the types of stories that gain the most attention because in this day and age people want news that is entertaining. The delivery of media is changing rapidly because of the Internet and it’s easy access to it. In the world of journalism there has always been traditional rules that are followed before any information is dispersed to the public. Some of the most common rules to be followed include checking and crosschecking sources, following the standards of editing, language and grammar. The new technology of the Internet is geared toward speed, an aspect that has always been an important part of journalism, but not always the most important part. Traditional journalism sorts the good information from bad. With the invention of the Internet, information is posted immediately and sources are not always confirmed. When the radio was invented Americans were really impressed by it and how the news was available at all hours. Soon. Twenty-four hour news networks were developed and news was delivered every hour on the hour, but still that wasn’t enough for the general public. Eventually news oriented World Wide Web sites began to be created. These sites number in the thousands and continue to grow rapidly. As we speak and begin to take in the volume of information, people are developing methods to bring the news faster to people at home, in the office or on the go. In ancient times news would be broadcasted at certain hours on television with broadcasters and a weatherman. Now it seems that soon this is going to be out dated and all we need to do is click a button and right in front of your face is the latest news stories. Another traditional way news was delivered was a newspaper. Today people are realizing that it’s expensive to print and deliver a quality paper in high fidelity to your home. There is also limited space where stories can be written and advertisers are able to put in ads. The Internet is endless, space is abundant and availability is infinite. Journalists have come to realize that it’s much easier to make one page of content on the web then to have it printed up. Newspapers are willing to give up accuracy for the speed ... ...he emergence of the Internet can have its downside also. Many times you can have a problem signing on or the news site that you wanted to explore could be down or under construction. Web sites track what users do as they click from page to page which can be a disadvantage to viewing these sites. They can direct a site to provide personalized layouts, shopping carts, and search options each time you return to the site. They can alert advertisers to put specific customized ads tied to your interests on the pages you visit. That is some down falls to using the Internet, but no matter how you look at it there are down falls to everything no body is perfect. The Internet is taking over all of are lives. No matter where we look we see something that relates to the Internet. It’s taking all the old customs of news reporting and creating all new ones. The emergence of the Internet has made news reporting a lot easier and accessible for the public. The world of media is accepting that the Internet is the next step in reporting and realizing that most college students are getting the news online. News media is going to be a changing culture because of all the new ways to deliver stories.

Athletic Budgets And Academic Performance Revisited

The article herein actually discusses the need for an athletics department in several educational institutions today to be able to handle the physical development needs of the students within the population. Aside from discussing the importance of the said department, it also aims to show the pros and the cons of implying the said culture in the school institutions with regards the existence of athletes and non-athletes. Undeniably, the study tries to make certain amendments on how the situation could be effectively dealt with. Certainly, the researchers aim to fix the situation through surveying the population involved in the situation thus seeing how well they could deal with the challenges of the matter. Central Theme of the Study When one considers the prospects of improved health, character development, and increased popularity, joining an organized sports team may still seem like the smart thing to do. The journal too points out that more kids are signing up for organized sports today than did any previous generation. The bad news though is that they are dropping out of these sports programs in record numbers. Usually, by the time they’re fifteen, seventy-five percent of kids who have ever played a sport have dropped out of it. Researchers say that such dropouts usually give a surprisingly simple reason for their departure: The games are no longer fun. Indeed, playing on a team can be an exhausting and time-consuming project. Seventeen magazine told its readers that simply trying out for a team may involve working â€Å"three hours a day, five days a week . . . for about one or two weeks. † If you survive that gauntlet and make the team, many more hours of workouts and practice drills are in your future. Typical is the member of a girl’s basketball team who spends over three hours a day training for her game. That time could be spent in doing something more worthwhile. Of course, many youths do not mind the grueling routine. They enjoy the fun and the challenge of perfecting their athletic skills. But there are other reasons why a large number of youths drop out of organized athletics. You need to be aware of them in order to decide whether to join a team or not. Reasons Behind the Study’s Progress Athletics are not for everyone—at least, not everyone should participate without medical supervision. Who especially need supervision? â€Å"Athletic recreation is a questionable option for the pathological hurrier, the type of person who rushes to work, rushes through lunch, and rushes home during the rush hour to rush through chores before rushing to bed. That type of person is very liable to use exercise as just another avenue of rushing to the grave. The study further points out the need of balancing the support for athletics and non-athletics within the student population thus also balancing the activity of the school as centered both on academics and athletic values as implied to the students. Strengths and Weaknesses of the Study The theme of the study had been strongly implied within the discussions. It could not be denied that the researchers actually made it certain that the issue be handled in a more specific manner that involves the examination of the situation through survey approaches. This method of the study actually makes it more applicable in actual situations that most institutions are undergoing right now. Overall Reaction to the Study Overall, the study was able to address all the necessary points of consideration that needs to be dealt with in connection with the said matter. Utilizing survey approach was indeed useful, such process of gaining information for better further applications increase the capability of the study to become highly important to the population of the society that it intends to serve. Understandably, as a scholarly article, the researchers were able to find the necessary points that needs consideration thus giving out a better result for the audience to understand the situation in a much lighter and clearer sense.

Ebola Study Essay

DALLAS — The Texas nurse who contracted Ebola while caring for the first person to die of the virus in the U.S. has been identified as 26-year-old Nina Pham. Health officials have not released the nurse’s name, but Yahoo News identified Pham through public records and a state nursing database. Then on Monday, Pham’s family confirmed her identity to local Dallas ABC News affiliate WFAA. Pham, a critical care nurse at Texas Health Presbyterian Dallas, is one of at least 50 people who cared for Thomas Eric Duncan before he passed away last Wednesday. Pham has been in isolation since late Friday. The CDC confirmed her Ebola diagnosis on Sunday. It is the first time the deadly virus has ever been transmitted in the United States. The Dallas resident is a 2010 graduate of Texas Christian University and has been a nurse since June 2010, according to state records. CDC director Dr. Thomas Frieden said Pham is in stable condition at Texas Health Presbyterian. An unidentified person Pham had close contact with last week is also in isolation at the hospital, but Frieden said that individual has not become ill. Investigators have not determined how Pham specifically contracted the disease from Duncan, who died on his 10th day of intensive care at Texas Health Presbyterian. â€Å"If this one individual was infected and we don’t know how — within the isolation unit — then it is possible that other individuals could have been infected as well,† Frieden said during a press conference. â€Å"We consider them to be at risk and we are doing an in-depth review and investigation.† A day earlier, Frieden characterized the transmission from Duncan to Pham as a possible breach in safety protocols. On Monday he apologized for those remarks. â€Å"Some interpreted that as finding fault with the hospital or the health care worker, and I’m sorry if that was the impression given, that was certainly not my intention,† Frieden said. â€Å"What we need to do, is all take responsibility for improving the safety of those on the front lines. I feel awful that a health care worker became infected in the care of an Ebola patient. She was there trying to help the first patient survive.† Tom Ha, a longtime friend of Pham’s family, told the Dallas Morning News that it is in the nurse’s genes to go out of her way to assist others. â€Å"I expect, with the big heart that she has, she went beyond what she was supposed to do to help anyone in need,† Ha told the newspaper

Chemistry of the stratosphere Essay Example

Chemistry of the stratosphere Essay Example Chemistry of the stratosphere Essay Chemistry of the stratosphere Essay Measurements can be taken using the helium balloons. A 10 miles long cord is used to attach the balloon and the measuring device which can be reeled in and out to take measurements at different altitudes. Spectroscopic measurements can also be taken from the ground stations by looking upwards through the vertical column of the air. Laboratory measurements We need to know which species absorb solar radiation, the wavelength of the radiation absorbed and the strength of the radiation. It is also important to know which products are formed as a result of which reaction and the rate of the reaction, using the flash photolysis technique. In this, an intense laser flash starts the reaction and the composition is measured spectroscopically using a carefully times second flash. Meteorology It is essential to know about the conditions in the stratosphere and the how the gases mix up. Distances are vast in the stratosphere and the mixing between the vertical layers is slow, whereas air circulating around latitude lines, help gasses to mix within a layer. The information collected by the sources mentioned above is used to create models and therefore make predictions. Evidence that led scientists to link ozone depletion with the use of CFCs In 1972, a method of detecting the CFCs in the troposphere was developed. A gas chromatograph was used to split the air into different components. This was coupled to an electron-capture detector which was sensitive to the halogen compounds. Small concentrations of CCl3F in rural areas were detected, which was able to diffuse intact to Antarctica. It was thought that a CFC molecule would get involved in the following reaction. The Cl radicals could destroy the ozone in the reaction shown in the diagram. This information lead to the conclusion that Cl radicals had a very long lifetime and one radical could destroy 100 000 molecules of ozone. Extensive global monitoring of CFCs was carried out and this amount was compared with the amounts released in troposphere and it was concluded that most of the molecules released were still there. The chemicals reactions by which ozone is depleted in the stratosphere and why ozone depletion is most severe over Antarctica in the southern spring. Ozone depletion occurs by the release of CFCs and some other ozone-depleting substances. A single chlorine atom can break about 1million ozone molecules. When CFCs reach the stratosphere, the strong ultraviolet radiation from the sun breaks them apart, releasing chlorine which react with ozone. Cl + O3 ClO + O2 ClO formed is another radical which reacts with oxygen atoms. ClO + O2 Cl + O2 This could start the chemical cycles of ozone destruction depleting the ozone layer. Cl atoms are regenerated and can go on to react with more O3 Following is another way that the ozone could be removed. O + O3 O2 + O2 Hydroxyl radicals can also play a part in the depletion of ozone. HO + O3 HO2 + O2 The HO2 could then react with oxygen atoms. HO2 + O HO + O2 The ozone depletion is most severe over Antarctica in the southern spring which results from the weather conditions in winter because the sun disappears for a period of six months. Air cools down making the temperature fall and clouds form in the stratosphere. These clouds contain particles of nitric acid triydrate (HNO33H2O) below 195K which are frozen around the sulphuric acid nuclei. A decrease in temperature leads to the condensation of water vapour as ice on the surface of these particles. The solid particles provide a surface for the chemical reactions to take place. Chlorine reservoirs collect on these surfaces and react. HCl + ClONO2 cloud Cl2 + HNO3 surface These chlorine atoms are released into the stratosphere. Te return of sunlight after six months splits the chlorine molecules into chlorine atoms which leads to dramatic fall in the ozone concentration. Why the CFCs have been used so widely and the advantages and disadvantages of their replacements Chlorofluorocarbons are found to combine lox toxicity, high chemical stability and non-flammability with good performance. CFCs and the HCFCs were use as refrigerants because they have appropriate boiling point which is low enough to evaporate efficiently but high enough to liquefy by compression. They also have a freezing point low enough to prevent the liquid from solidifying. CFCs were used for several applications, which include air conditioners, water chillers, aerosols, domestic fridges and freezers, dry cleaning and biomedical freezers. After discovering about the ozone depletion related to the use of CFCs, various other substances were to be found which would be environmentally friendly. HFCs seemed like the solution. The hydro fluorocarbons (HFCs) compounds contain only carbon, hydrogen and fluorine. They are chosen because they contain fluorine as their only halogen. Free fluorine atoms can only be liberated from a fluorine-containing substance by putting in a considerable amount of energy. This required energy input is far more than is available in the solar radiation I the stratosphere. If the fluorine atom was to be produced, it would be highly reactive and would abstract a hydrogen atom from a molecule like water to form an inert hydrogen fluoride. No free fluorine atoms in the stratosphere would lead to no ozone destruction. Also, HFCs are usually destroyed in the lower atmosphere by hydroxyl radicals so only a small proportion can reach the stratosphere. The disadvantage of using HFCs is that the equipment was designed to optimise the performance of CFCs and HCFCs and the use of HFCs would mean the redesigning of all the equipment. In future, cooling technologies not involving HFCs maybe introduced, especially where they have technical advantages and where the potential hazards can be easily controlled. Bibliography 1) How do we know that CFCs destroy the ozone layer? By Mike Pilling. Chemistry Review, March 1993. Philip Allan Publishers Ltd. 2) The rise and fall of CFCs by Dr Richard Dick Powel. Chemistry Review, September 1996. Philip Allan Publishers Ltd:Â  epa.gov