Inkjet Printing Techniques Essay Example | Topics and Well Written Essays - 500 words

Inkjet Printing Techniques - Essay Example This nozzle is connected to an ink reservoir, and places a singly drop of ink at a definite location on the substrate. A commercial inkjet printer’s head has approximately 300 nozzles per inch in the single column variety, and 600 nozzles per inch in the print head with two columns. All these nozzles can release a droplet of ink simultaneously (Madou 165). A few of the inkjet printer manufacturing companies have been able to produce printers that contain 600 nozzles per inch, in a single column. The inkjet print head is controlled by the software that is supplied by the printer manufacturing company. This software controls a number of parameters, such as ink temperature, ejection speed, print speed and the volume of the ejected drop (Madou 165). Out of the several types of inkjet technologies that are available, Thermal inkjet and Piezo-electric printers are used in mechatronics fabrication. The difference between these is the driving force behind the ink ejection. The principles, upon which these two technologies are based on, are described in the sequel (Madou 165). This method is commonly referred to as a bubble jet. In a thermal inkjet printer, small resistors are utilised to heat a thin ink layer, around 0.1ÃŽ ¼m, at a heating rate of around 100Â ° C/ÃŽ ¼sec to achieve of about 340Â °C. At this temperature, the ink layer is transformed into superheated vapour, which explodes and creates a bubble. This process takes less than 3 ÃŽ ¼ sec. Thereafter, this bubble grows, within 3 to 10 ÃŽ ¼sec, to form an ink drop at the tip of the nozzle. Afterwards, this bubble collapses and the drop descends from the nozzle, within 10 to 20ÃŽ ¼sec, to deposit on the substrate. The collapsed bubble creates a partial vacuum, which causes fresh ink to be drawn into the resistors, in order to form the next bubble at the nozzle. The time taken for a bubble to form at the nozzle is less than 80Â µsec at the operating frequency of 12 kHz. It is to

Network design paper Coursework Example | Topics and Well Written Essays - 1000 words

Network design paper - Coursework Example RIP is nominated by IETF as one of various other Interior Gateway Protocols (IGPs). RIP works on distance learning vector algorithms while most of other protocols use sophisticated algorithms demanding time as well. (Dean, 2010, p. 274-275) RIP’s routing procedure is that its gateway router transmits complete information of routing table (that includes all the connected hops that are known to the gateway) to its nearest host after every 30 seconds. The neighboring router than pass the same information to its nearest neighbor other than from which it had received this information and process continues until every routers in the network has similar information of the routing paths. This condition is what we called network convergence. For determining distance of the network RIP uses process called hop count. Every hop in the network determines its neighboring hop(s) from routing table information for sending a packet to for a particular destination. Advantages of using RIP in th e network are: For small homogeneous networks RIP is considered as an effective solution. RIP is very easy to understand and configuring. It can be configured on all the routers present. Generally RIP is a loop free routing protocol but has limited scalability of around 15 hop maximum. Introduction to OSPF: Open Shortest Path First (OSPF) is a routing protocol implemented within large autonomous networks. OSPF is nominated by IETF as one of various other Interior Gateway Protocols (IGPs). In a network where OSPF is used, if a router that receives a change in the routing table or identifies a modification in the network without delay multicasts this change information to every other host connected in the network with the intention that every host may have the similar information in the routing table. It only transmits the change that has occurred, not the entire routing table like RIP. It is a robust link-state routing protocol and is the most widely used Interior Gateway Protocol (I GP). It bases information on link-states that take additional network description into consideration. OSPF have functionality of prioritizing the path by assigning metric value to that path. For further dividing the subnets OSPF supports a variable network subnet mask. Advantages of using OSPF in the network are: Quickly responds to the network changes. Sends trigger updates when change occurs in the network. Use cost as metric for giving preference to the paths. It has protocol identifier of 89 in the IP address for OSPF packet identification. Summarizing the solution: As being the administrator of the company and as per the details given to me I know that my network running is RIP on it and has three networks while the merging company has one OSPF running network that means RIP networks outnumber the OSPF network so I do not prefer to change anything on my own network. For example if someone is the administrator of Windows server based sites and a new company is merging having Lin ux operating system. Although everyone knows that Linux has more advantages than windows but still would not feel easy to change my operating system. If to choose change than should also keep in mind that new Service-Level-Agreements, new suppliers, new business processes, new interfaces, etc and staff training as well. Why to this everything is running smoothly already. Our solution could have been a different if and

Public Schools Segregation Essay Example for Free

Public Schools Segregation Essay I was recently struck by one of the political cartoons in the SacramentoBee newspaper, which presented an image comparison of drinking fountains in two schools. It quickly reminded me of the racist Jim Crow laws from the 1880s-1960s and how racial segregation existed almost everywhere in the United States at that time. However, I realize that this cartoon doesn’t portray the concept of racial segregation with a Jim Crow joke, but it makes a commentary on social segregation among public schools in the United States today. I slowly realized that all American public schools are not the same due to funding. The huge difference exists in the public school system because their funding is associated with local property taxes. If a school is located in an affluent area with wealthier residents who pay high property taxes, schools will receive more funding (School Funding 1). Do you think this system is fair? If I ask affluent parents, they probably would answer that they pay high property taxes, so their money should go straight to nourish public schools in their areas. Meanwhile, if I were to ask parents in low socioeconomic areas, they would say that funds should be distributed from the state and not by the county, which would help in reducing the inequality between schools. Although sharing funds is not fair for many affluent people who pay more taxes, we should encourage state governments to aid the poorer schools more because it helps to reduce poverty and prevent crimes in lower income neighborhoods. The first reason that poorer schools should get more funds is to reduce poverty. People in low-income areas might not get the direct effect from school funding, but in the future, their kids will be benefited greatly. For those in the low income bracket, education can be a legitimate way to help them climb out of poverty. However, in reality, most of these poorer schools today are still not treated equally as their richer counterparts. Lisa Black, Chicago Tribune reporter reviewed the vast difference between two public schools in the Chicago area to illustrate this point. The first school, Taft Elementary School in Lockport can’t offer students any arts, language or technology classes because of the limited budget available. Meanwhile, Rondout Elementary School, near Lake Forest, offers language programs such as Spanish in every grade including kindergarten. Most students use laptops in the class, and they can enjoy band and chorus classes. They can choose to study various art, drama and dance as well (Black 1). If poor children had the same opportunity as their counterparts, imagine the growth it could represent to them educational. If they enjoyed studying, they could move on to obtain higher education by attending to colleges, meaning better-paying jobs. Therefore, funds should be available for all people. Young minds deserve the opportunity to choose the programs that they want to study. They should be able to study art and any other subject, as they desire to, regardless of how much property tax their parents pay. In general, I believe that a good education is the foundation that can pave the way to a better quality of life. Aside from reducing poverty, preventing crimes is another reason that poorer schools should receive more funds. Crimes in lower income areas derive from being unable to sustain a decent living. These types of crimes can be directly connected to a lack of education and opportunity. Geoffrey Wodtke, a sociologist at the University of Michigan, mentions in his article that kids in poor neighborhood have less chance to graduate from high school (Wodtke 1). He also states: Poor neighborhoods are isolated and racially segregated, with none of the quality schools, day care, grocery stores, pharmacies, and parks that can help promote a child’s development and academic achievement; and they are disproportionately smoggy, crime-ridden and dilapidated. All of these factors, the researchers note, have been linked to poor performance in school, often culminating in dropouts. (1) Wodtke claims that poor neighborhoods affect school performance, and this can impact a child’s learning directly. Some children quit the schools because they have no interest in schooling. Dropping out is and having no high school diploma will limit a job opportunities. When they are not qualified for many jobs, they can’t escape the pitfalls of poverty. Therefore, some of them end up finding illegal ways to make money while others affiliate themselves with gangs (Wodtke 2). This is the reason why school is so important, because it is a good place to start children on equal footing educationally with the chance to better themselves in the future. However, schools in low-income areas still need more funds to afford having a variety of programs such as language, art and sports. Schools also need to be able to hire and retain qualified teachers. Moreover, every school should be able to afford sport programs, which is a good physical outlet for youthful energy and encourages good health and teamwork. Art programs should also be available because they provide an outlet to express creativity. A wider variety of activities and educational alternatives can create brighter and more promising futures if given the opportunities. These children can become doctors, football players or artists in the future as long as they get a fair amount of support from the beginning. It’s difficult to change the living environment in poorer neighborhoods, but we can start by improving the school system to reshape the future of that community. Some people think that pouring money into poor schools is wasteful. They believe the reason schools become poorly performing ones is because they are full of under-achieving students who lack interest in the curriculum. Even if some schools get more funds, it will not change anything. It’s like treating symptoms, but not starting at the root of the problem. They believe that the government should provide more funding to schools with higher achieving students who potentially will become successful contributing members of the community. In other words, the state government should invest in the right schools and students. However, I believe this thought to be completely wrong. People who believe this will never know the potential of students in lower-income schools unless they are given a fair and equal opportunity to succeed. If poorer schools receive more funding, they will be able to provide better facilities and a stronger variety in the curriculum. These factors would increase the chances that we see more students grow into productive and successful adults despite coming from lower class surroundings. When every school has the same resources and variety of programs available to their youths, political cartoons like this one will be a thing of the past because the educational system’s inequalities will no longer be a joke. We should call for action on the funding to reform poorer schools because education can help in reducing poverty and crimes in these neighborhoods. Although affluent parents who work harder and pay more property taxes might oppose an idea of distributed funding to poor schools, they should think about economic consequences. If a gap between rich schools and poor schools is still expanding, how can the children of today become responsible adults in the future? If this country is the land of freedom and opportunity for everyone, I should hope that schools would be the first place to start by giving equal opportunities to all children. Poorer schools should receive equal opportunities like those of the children in wealthier communities. Schools should be a sacred place where all children of any social standing are afforded the same opportunities of unlimited educational growth. The more we see children shine in their youth, the more likely they will rise up to become successful in the future and this will help strengthen the future of the United States’ socially and economically.

Interlayer Effect: Si-based Double Junction Tandem Solar

Interlayer Effect: Si-based Double Junction Tandem Solar Investigation of Interlayer Effect on Si-based Double Junction Tandem Solar Cell Abstract: Silicon-based double junction tandem solar cell was fabricated and simulated using wxAMPS software. Nano structure of SiO2/ Si3N4 interlayer was inserted between the silicon and InGaN junction to investigate the effect on the quantum efficiency of the Si-based solar cell. The quantum efficiency characterizations were studied under AM1.5 solar spectrum at 300o K. SiO2 was found to be an excellent interlayer for Si-based double junction tandem solar cell compared to Si3N4 and exhibit better quantum efficiency. The addition of SiO2 and Si3N4 nano structure interlayer between the Si and InGaN improved the Jsc by 5.79% and 2.21% respectively compared to the absence of interlayer. Key-Words: Silicon solar cell, interlayer, silicon dioxide, silicon nitride, quantum efficiency, wxAMPS 1  Introduction Due to its low material cost and ease of manufacturing, silicon-based solar cells are preferred for energy conversion. Advances in the technology have significantly improved the overall performance of silicon solar cells. Besides, Si has better cooling capability compared to sapphire [1]. Si has larger thermal conductivity which promises much faster thermal dissipation [2]. Since solar cells operate under high temperature, this characteristic is strongly desired. Indium gallium nitride (InGaN) is one of the best semiconductor materials for optoelectronics which can operate in high-temperature. In addition, InGaN is a widely used for multi-junction tandem solar cells with high conversion efficiency and shown a better resistance to radiation damage compared to other materials. It provides variety of band gap energies as the band gap changes with the In-Ga ratio. Due to its potential in cost reduction and faster thermal dissipation, researchers are committed to study InGaN-on-Si technol ogies. As Si and InGaN is having large relative lattice mismatch, the conversion efficiency of the device is limited. This issue leads to phase separations. Because of that, suitable interlayer or absorber layer is desired to ensure each layer to match. Thermal lattice mismatch was reported by Krost et. al in 2002 stating that cracking of GaN on Si usually occurs due to the large thermal mismatch of GaN. The thermal stress can be reduced significantly by insertion of low-temperature AlN interlayers, introducing multiple AlGaN/GaN interlayers, and growing on prepatterned substrates [3]. The interface traps at the nitride/Si interface exhibit dissimilar properties from those at the SiO2/Si interface in some aspects. Thermally grown SiO2, the currently established gate dielectric for Si-based MOS devices, possesses remarkable electronic properties that are unmatched by other materials. Both SiO2 and Si3N4 are equally transparent even for high energy edge UV band of solar spectrum. SiO2 is highly technically established materials as a passivation layer for Si based MOS technology and it may also be used for integration of PD technology [4]. Si3N4 is also potential coating materials against degradation of detecting device even in high radiation environment and temperature [5]. Implementation of double junction solar cell is one of the alternatives in enhancing the output characteristic of solar cell [6]. Users demand a better efficiency and higher output current of solar cell. Thus, we investigated the structure of InGaN-on-Si solar cell with the presence of different interlayer (SiO2 and Si3N4) which was inserted between Si and InGaN layer to intensify the light conversion in the cell. This structure enables the increase of current of both top and bottom cell by reducing the recombination effects [7]. In this paper, we focused on the quantum efficiency which is one of the criteria that must be considered as we can evaluate the amount of current that the cell will produce when exposed to sunlight. 2  Experimental Procedure The structure as shown in the Fig. 1 was fabricated using wxAMPS software which was developed by Prof. Rockett and Dr. Yiming Liu of UIUC and Prof. Fonash of PSU. The solar cells were grown on a n-type silicon substrate. Three different experiments have been conducted; without interlayer, with SiO2 interlayer and with Si3N4 interlayer. Fig. 1- Structure of the solar cell Composition of In0.4Ga0.6N with Eg=1.99 eVwas used in all three experiments. The output characteristics were studied under AM1.5 solar spectrum at 300oK. InGaN is chemically a n-type semiconductor because of the presence of nitrogen in the composition. Mg is used to dope the InGaN in order to make it p-type [8]. 3  Result and Discussion Fig. 1 presents the internal quantum efficiency of the three conducted experiments. Fig. 2- Internal Quantum Efficiency From Fig. 2, insertion of SiO2interlayer shows better IQE compared to Si3N4 and without interlayer. The difference in the IQE can be seen at high energy spectrum. The difference is due to the recombination at the surface of the cells. When carriers are generated near the surface, and since blue light for example is absorbed very close to the surface, quantum efficiency at high energy edge which absorbed very close to the surface will be affected by the front surface recombination. Presence of interlayer leads to a higher generation rate and it is more significant at the wavelength ÃŽ »2/ Si3N4is introduced between the Si and InGaN layer, the absorption is further improved and enhances the diffusion length. The highest quantum efficiency is recorded at the wavelength of 650-700 nm. The surface recombination and diffusion length in the bottom cell tends to shift the peak to lower energy edge. The properties of SiO2 and Si3N4 itself differs from each other. SiO2 has a refractive index o f 1.57 while Si3N4 with refractive index of 2.05. SiO2 permits selective diffusions into silicon wafer. Fig. 3- Current density without interlayer Since the solar cells are made up of p-type and n-type semiconductors, electrons from the n-region near the p–n junctionlikely to diffuse into the p region. As these electrons diffuse, positively charged ions (donors) are left in the n-region. On the other hand, holes from the p-type region near the p–n junction start to diffuse into the n- region. As we analyze the current density behavior based on the structure in Fig. 1, the bottom cell (Si) which is stacked with InGaN layer determines the current density with the presence/absence of interlayer. It can be seen that recombination that occur in the bottom cell affected its total performance. Besides, the in-plane lattice mismatch between Si and InGaN was reported by Henini in his book. Direct growth of InGaN layer on Si (without buffer or interlayer) gives in-plane mismatch from -7.81% to -17%; depending on the content of Indium and Gallium [9]. Direct growth of InGaN on Si makes some part of the InGaN diffused into th e Si. Carrier recombinations at localized states arise due to this lattice mismatch which leads to lower Jsc. Besides, cracking of GaN on Si usually occurs due to the large thermal mismatch of GaN. This lattice mismatch effect can be reduced by inserting interlayer which can reduce the thermal stress between the junction of InGaN and Si. GaN-based semiconductor is not well suited for direct growth on Si. Fig. 4- Current density for Si3N4 interlayer From Fig. 4, the behavior of the current density with Si3N4 interlayer is almost the same with no interlayer but it gives lower recombination rate hence produces greater current-density compared to the one in Fig. 3. At 0.08  µm-0.1  µm, it can be observed that Jn and Jp stay constant at a deeper position from the bottom cell. The final alignment and function of InGaN cell is strongly dependent on the starting substrate type, orientation, substrate pre-treatment, type of buffer or inter layer and growth conditions. High recombination rate as shown in Fig.3 and Fig. 4 is not desired. Thus, Si3N4 is not so suitable to be used as an interlayer between Si and InGaN. Fig. 5- Current density SiO2 for interlayer Fig. 5 shows the current density at the bottom cell when SiO2 is used as interlayer. Unlike Si3N4, cells with SiO2 as its interlayer give less recombination rate. The type and magnitude of recombination processes in the cell greatly affected the minority carrier lifetime and the diffusion length. The recombination rate will depend on the number of defects present in the material. Defects here may refer to the doping concentration, dopants or the properties of the material itself. Less interface defects are shown by SiO2 and this is proven by nowadays Si fabrication technology which uses SiO2 as gate interface. Even though both SiO2 and Si3N4 are equally transparent for high energy edge of solar spectrum, but the interface traps at the nitride/Si interface exhibit contradictory properties from those at the SiO2/Si interface in some aspects. No interlayer SiO2 interlayer Si3N4 interlayer Voc (V) 1.5886 1.6371 1.5912 Jsc (mA/cm2) 6.4706 6.8454 6.6136 FF (%) 48.439 52.2130 48.8326 Efficiency (%) 4.9791 5.8513 5.1390 Table 1- Output characteristics of the solar cell based on different interlayer The output characteristics as shown in Table 1 are relatively important in determining the performance of solar cells based on different interlayer. It can be seen that SiO2gives a higher Voc, Jsc, fill factor and efficiency compared to Si3N4. The addition of SiO2/Si3N4 nano structure interlayer between the Si and InGaN improves the Jsc by 5.79% and 2.21% respectively compared to the absence of interlayer. 4  Conclusion The effect of different interlayer on Si-based solar cell is studied. InGaN is not well suited fordirectgrowthonsiliconsubstrate. SiO2 has shown to be an excellent interlayer between Si and InGaN cell. It appears that suitable choice of interlayer is important to match the top cell and the bottom cell. The interlayer also will give a significant effect on its quantum efficiency and total current density. 5 Acknowledgement I would like to thank Pusat Penyelidikan dan Inovasi UMS and Kerajaan Malaysia for the funding of this project (Project code: FRG0307-TK-1/2012). References: C.Y.Liuet al.,Nitride-based concentrator solar cells grown on Si substrates, Solar Energy Materials Solar Cells117(2013)54–58 Miro Zeman Janez Krc. Electrical and Optical Modelling of Thin-Film Silicon Solar Cells.MRS Proceedings. Vol. 989. No. 1. Cambridge University Press, 2007. Krost, Alois, and Armin Dadgar. GaN-based optoelectronics on silicon substrates.Materials Science and Engineering: B93.1 (2002): 77-84. Eujune Lee et, al., IEEE Electron Device Letters, Vol. 30, No. 5, May 2009 Sinje K-C et. al., 26th EU PVSEC European Photovoltaic Solar Energy Conference Exhibition, 05-09 Sept., 2011 L. A. Vilbois et al., Simulation of a Solar Cell Based on InGaN, Energy Procedia 18 ( 2012 ) 795 – 806 El Gmili, Y., et al. Multilayered InGaN/GaN structure vs. single InGaN layer for solar cell applications: A comparative study.ActaMaterialia61.17 (2013): 6587-6596. Islam, Rafiqul, et al. MOVPE Growth of InxGa1-xN(x~0.4) and Fabrication of Homo-junction Solar Cells.Journal of Materials Science Technology(2012). Henini, Mohamed. Molecular beam epitaxy from research to mass-production, Newnes (1996): 33-36. Chang, J-Y., et al. Numerical Investigation of High-Efficiency InGaN-Based Multijunction Solar Cell. (2013): 1-1. Despeisse, M., et al. Resistive interlayer for improved performance of thin film silicon solar cells on highly textured substrate.Applied Physics Letters96.7 (2010): 073507-073507. Araà ºjo, Andreia, et al. Role of a disperse carbon interlayer on the performances of tandem a-Si solar cells.Science and Technology of Advanced Materials14.4 (2013): 045009. Liu, Yiming, Yun Sun, and Angus Rockett. A new simulation software of solar cells—wxAMPS.Solar Energy Materials and Solar Cells98 (2012): 124-128. Liu, Yiming, Yun Sun, and Angus Rockett. Batch simulation of solar cells by using Matlab and wxAMPS. InPhotovoltaic Specialists Conference (PVSC), 2012 38th IEEE, pp. 000902-000905. IEEE, 2012.

Intellinex, LLC :: essays research papers fc

Executive Summary Intellinex LLC is an eLearning company that was recently spun off from its parent Ernest & Young LLP. At its inception Intellinex claimed to be one of the largest eLearning providers. They have an aggressive strategy to take advantage of the consolidating eLearning market and become a "one-stop" provider of all eLearning services for their clients. Their focus is on creating customized training for clients and helping them to implement and maintain their on-line courses. Products and services are geared toward large companies that spend approximately $1 million on their eLearning projects; not individuals or small companies. They have asserted a strenuous goal of $100 million revenue in the first year of business. Company Background Intellinex LLC is an eLearning provider of â€Å"one-stop learning solutions that are faster, lower in cost, more flexible, and more convenient than traditional classroom training,† (www.intellinex.com). Ernst & Young LLP launched their wholly owned eLearning venture, Intellinex LLC, on October 5, 2000. Ernst & Young was the first of the â€Å"Big 5† firms to create an operating company that offers eLearning services. With less than a year of experience practicing business on their own, much of the background information for Intellinex stems from their internal work with Ernst & Young prior to the spin off. Their parent had already seen the light of eLearning and began creating training that â€Å"focused on everything a young audit person would need when first starting their career†. Almost all Ernst & Young employees had begun taking eLearning courses through a unit now known at Intellinex. They found that it was less expensive to train them onl ine than to fly them to training centers for multiple courses. Due to Year 2000 concerns, Ernst & Young changed its curriculum-development procedures and what previously took 200 hours to create 1 hour of online training now takes 20 hours. (Walsh 2) Intellinex was able to take advantage of this change. Ernst & Young already had more than 40 clients receiving eLearning services using this unit. Ernst and Young will continue to use Intellinex for internal training through a third party agreement. (Howell 2) Ernst & Young’s decision to separate from its online corporate training department was in hopes of increasing the unit’s profitability by acquisitions. Intellinex started with more than 400 employees and five major locations. Their focus was providing customized training for clients through satellite, desktop web casting, streaming video, and web-based courses. Intellinex, LLC :: essays research papers fc Executive Summary Intellinex LLC is an eLearning company that was recently spun off from its parent Ernest & Young LLP. At its inception Intellinex claimed to be one of the largest eLearning providers. They have an aggressive strategy to take advantage of the consolidating eLearning market and become a "one-stop" provider of all eLearning services for their clients. Their focus is on creating customized training for clients and helping them to implement and maintain their on-line courses. Products and services are geared toward large companies that spend approximately $1 million on their eLearning projects; not individuals or small companies. They have asserted a strenuous goal of $100 million revenue in the first year of business. Company Background Intellinex LLC is an eLearning provider of â€Å"one-stop learning solutions that are faster, lower in cost, more flexible, and more convenient than traditional classroom training,† (www.intellinex.com). Ernst & Young LLP launched their wholly owned eLearning venture, Intellinex LLC, on October 5, 2000. Ernst & Young was the first of the â€Å"Big 5† firms to create an operating company that offers eLearning services. With less than a year of experience practicing business on their own, much of the background information for Intellinex stems from their internal work with Ernst & Young prior to the spin off. Their parent had already seen the light of eLearning and began creating training that â€Å"focused on everything a young audit person would need when first starting their career†. Almost all Ernst & Young employees had begun taking eLearning courses through a unit now known at Intellinex. They found that it was less expensive to train them onl ine than to fly them to training centers for multiple courses. Due to Year 2000 concerns, Ernst & Young changed its curriculum-development procedures and what previously took 200 hours to create 1 hour of online training now takes 20 hours. (Walsh 2) Intellinex was able to take advantage of this change. Ernst & Young already had more than 40 clients receiving eLearning services using this unit. Ernst and Young will continue to use Intellinex for internal training through a third party agreement. (Howell 2) Ernst & Young’s decision to separate from its online corporate training department was in hopes of increasing the unit’s profitability by acquisitions. Intellinex started with more than 400 employees and five major locations. Their focus was providing customized training for clients through satellite, desktop web casting, streaming video, and web-based courses.

The Impact Of Television Essay examples -- essays research papers fc

The Impact Of Television   Ã‚  Ã‚  Ã‚  Ã‚  Since the beginning, there have been mixed reactions to television and it was E.B. White who wrote "I believe that television is going to be the test of the modern world, and in this new opportunity to see beyond the range of our own vision, we shall discover either a new and unbearable disturbance of the general peace or a saving radiance in the sky. We shall stand or fall by television, of that I am sure." (Murray 7) White was correct, it would either be beneficial or detrimental to society. Ever since the first television station was licensed in 1941, our lives have been effected by the presence of television. However, this effect is not for the negative since it is used from simple means of entertainment to a widely used, invaluable, source of information. It is also an excellent aid in preparing children for school and assisting in educating children after they have begun school.   Ã‚  Ã‚  Ã‚  Ã‚  Every day millions of people turn to their televisions as a form of escape from the pressures and stress of day to day life. The television, to them, serves the purpose of entertaining them for a half hour or an hour at a time. This is the purpose of sitcoms, such as the popular NBC produced shows Friends and Fraiser, each appealing to different audiences, but both comedy bases for purposes of entertaining. Humor is not the only approach used in television entertainment. Shows, such as NYPD Blue, use thick plot lines and heavy drama to draw the viewer in. Entertaining society through this media has become a multibillion dollar industry. Top movies like Jurassic Park, which grossed 390 million dollars, bring millions of people to movie theater, which are basically large televisions, for the soul purpose of entertainment. Movies are not restricted only to theaters since they are available on video cassette and even broadcasted into millions of homes each day. The privilege of television as entertainment should be used, but not abused. For instance, watching six hours of television every night, stopping only to eat and sleep does not promote and active lifestyle, however, on the other end of the spectrum, never watching any television does not expose a person to a vast array of entertainment and information.   Ã‚  Ã‚  Ã‚  Ã‚  Television is able to show different roles in society and therefore people are able to better u... ...more educational and informative programs for children.   Ã‚  Ã‚  Ã‚  Ã‚  Society has been effected and will continue to be effected, not only by television, but by media in general. Television is a constant form of entertainment and excellent source of information that is assessable by millions of people. The education content in children television is beneficial to preschoolers and students alike. However, television has been the blame for many of societies faults because it is easy to contribute it to violence and a social lack of initiative. Television is such a small part of a much larger picture and its benefits far outweigh its faults. The idea of television as an informative and education media must be embraced in the future to receive its full benefits. Even the thought of a society without television is incomprehensible to many. Bibliography "Background Information: The Impact of Television on Children's Education." Http://haas.berkely.edu/~atham/background.html (October 21, 1996) Murray, John P. "Children and Television Violence." Kansas Journal of Law & Public Policy, 4, No. 3 (1995), 7-14 "Top 50 Movies, 1993." The World Almanac and Book of Facts. 1995

An International Investment Portfolio Accounting Essay

International investing seems to pull many investors resulted from the many benefits of the published international investing portfolio by houses all over the universe. Fund investors can play a portion in the economic growing of the other states, able to reexamine their rate of hazard, recognizing variegation effects and taking advantage of different market sections on a planetary graduated table. Globalization reflects the world-wide growing of marketing single states. These advantages may look alluring but the hazards involved for international investing must non be overlooked. In an international investing position, fiscal investings are non merely subjected to currency and political hazard. However, there are many organisations drawbacks and troubles, one of which is related to revenue enhancement issues. These failings of an organisation normally benefited those investors who are able to pull off to get the better of those troubles in a well-organised attack. 1 IntroductionThe international economic activities presently have been increased dramatically due to the investing of concern internationally. International economic systems have become incorporated through a huge web of communicating and trade with the aid of globalisation. Due to globalisation, international flow of fiscal assets have been improved by many progresss in better lower cost of communicating and conveyance, which means that geographical distances are unimportant and therefore national economic systems are closely linked. Investing portfolio normally involves the purchase of bonds, portions, stocks and assets by foreign international investors, all of them with the cardinal aim of accomplishing a fiscal net income. It works in a assortment of different ways toward the end of conserving and bring forthing net incomes. Money could be made from perchance any investing environment even though international fiscal markets are really much composite. International portfolio investing is someway hazardous. The greatest challenge faced about by all investors in doing an investing portfolio work is by cognizing precisely what to make at the right clip. The factors that usually affects are foreign exchange rates, involvement rates and revenue enhancement rates on involvements. Therefore, a well-diversified portfolio is recommended to extenuate hazard. When the investors want to broaden their investing, they will detect the international market and puting in foreign companies. The important ground why internation al portfolio investing might heighten stable returns and cut down hazard is the broader variegation. One of the benefits of broader variegation is risk-return trade-off, which is more profitable while puting internationally. Another possible benefit is the variegation of currency, which means it non merely exposed a foreign company ‘s operation, but besides to this foreign currency. As an investing fund director, the direction includes make up one's minding what assets to buy, how many to buy, and when is the best clip to buy. These determinations must hold some analysis of measurings, which typically involves expected return on the portfolio and the hazard on the return. 2 Evaluation of the listed houses2.1 Brief debut of the 3 list housesDASHANG GROUP ‘A ‘ Code: CN: DDS ( P ) explain SPECIALTY FASH.GP. ( BER ) Code: Calciferol: MVJ ( P ) explain Pacific Internet Code: Joule: PNET ( P ) explain2.2 Asses the VaR exposure of the investings 2.3 Analyzing the economic exposure of each company Figure2.3.1: Figure 2.3.2: Figure 2.3.3: 2.3.1 Arrested development Analysis Arrested development analysis is a widely used statistical tool agencies on concentrating on analysing the relationship between a dependant variable, Y, and independent variable, X, utilizing the simple additive theoretical account Y = a + bX. Regression analysis gives an apprehension on how the dependant variable Y alterations with changing independent variable Ten. The values of X and Y are inputted into Microsoft Excel and by utilizing the arrested development attack, values of a and B are calculated. Excel will so end product a drumhead consisted of a arrested development statistics table and ANOVA. The R2 is a grade of fluctuation, measured in per centum, in the dependant variable that can be accounted for by the independent variables. Multiple R is fundamentally the square root of R2. The standard mistake is an estimated value that is determined by Excel in concurrence with the estimated coefficient. Adjusted R2 is calculated utilizing All calculated values are as shown in table 2.3.1.1. explain observations ( N ) .Arrested development StatisticssDASHANG GROUP ‘A ‘SPECIALTY FASH.GP.Pacific InternetMultiple R0.598157750.6082954860.907217302R20.3577926930.3700233980.823043232Adjusted R20.3565529110.3688165460.822704235Standard Error2300.21234338.18072501118.5093191Observations520524524Table 2.3.1.1:Arrested development Statisticss 2.3.2 ANOVA ( Analysis of Variance ) There are two tabular arraies in ANOVA. 2.3.2.1 ANOVA OUTPUT I The constituents of the ANOVA were tabulated utilizing the undermentioned equations: P represents the figure of coefficients and K represents the entire figure of coefficients which in this instance k=p+1= 2.Regression df = k – 1. Residual df = n – K. Entire df = n – 1. Entire SS = Regression SS + Residual SS. Regression MS = Regression SS/ ( k – 1 ) . Residual MS = Residual SS/ ( n – K ) . F =Regression MS/Residual MS. Significance F = FDIST ( F, k – 1, n – K ) .The consequences are as shown in tabular arraies 2.3.2.1, 2.3.2.2 and 2.3.2.3.Analysis of variancedfUnited states secret serviceMultiple sclerosisFSignificance FArrested development115269395491526939549288.598.99811 & A ; times ; 10-52Residual51827407259955290976N/AN/AEntire5194267665544N/AN/AN/ATable 2.3.2.1:ANOVA end product I – DASHANG GROUP ‘A ‘Analysis of variancedfUnited states secret serviceMultiple sclerosisFSignificance FArrested development1446954.807446954.807306.62.40467 & A ; times ; 10-54Residual522760954.7721457.8N/AN/AEntire5231207909.58N/AN/AN/ATable 2.3.2.2:ANOVA end product I – Forte FASH.GP.Analysis of variancedfUnited states secret serviceMultiple sclerosisFSignificance FArrested development134098162.834098162.82427.91.8982 & A ; times ; 10-198Residual5227331207.4514044N/AN/AEntire52341429370.2N/AN/AN/ATable 2.3.2.3:ANOVA end product I – PACIFIC Internet 2.3.2.2 ANOVA OUTPUT II The following phase is the coefficients. ( Note that the Numberss have been converter to 3 denary topographic points to salvage infinite ) . It gives the coefficient for each parametric quantity, including the intercept. T-stat value is the ratio of the estimated coefficient value divided by the standard mistake value. T-stat value can be compared across all variables in comparing with the criterion error.. The p-value is associated with the variable, and the assurance intervals of the parametric quantity estimates as evaluated by Excel.Analysis of varianceCoefficientsStd. MistakeT statP-valueLower 95 %Upper 95 %Intercept-4642.803833.091-5.5734 & A ; times ; 10-8-6279.455-3006.151X Var 11212.555971.37716.9889 & A ; times ; 10-521072.3321352.78Table 2.3.3.1:ANOVA end product II – DASHANG GROUP ‘A ‘Analysis of varianceCoefficientsStd. MistakeT statP-valueLower 95 %Upper 95 %Intercept424.12819.53521.7116 & A ; times ; 10-75385.751462.505X Var 1-165.3979.446-17.512 & A ; times ; 10-54-183.953-146.84Table 2.3.3.2:ANOVA end product II – Forte FASH.GP.Analysis of varianceCoefficientsStd. MistakeT statP-valueLower 95 %Upper 95 %Intercept-412.87230.206-13.671 & A ; times ; 10-36-472.213-353.532X Var 19.1250.18549.2732 & A ; times ; 10-1988.7619.488Table 2.3.3.3:ANOVA end product II – Pacific Internet 2.3.3 Assurance Time intervals for Slope Coefficients 95 % assurance interval for incline coefficient & A ; szlig ; 2 is from Excel end product ( -1.4823, 2.1552 ) . Excel computes this as b2 Â ± t_.025 ( 3 ) – Se ( b2 )= 0.33647 Â ± TINV ( 0.05, 2 ) – 0.42270= 0.33647 Â ± 4.303 – 0.42270= 0.33647 Â ± 1.8189= ( -1.4823, 2.1552 ) . Other assurance intervals can be obtained.For illustration, to happen 99 % assurance intervals: in the Regression duologue box ( in the Data Analysis Add-in ) , look into the Confidence Level box and set the degree to 99 % . 2.3.4 Test of Statistical Significance The coefficient of HH SIZE has estimated standard mistake of 0.4227, t-statistic of 0.7960 and p-value of 0.5095.It is hence statistically undistinguished at significance degree a = .05 as P & gt ; 0.05. The coefficient of CUBED HH SIZE has estimated standard mistake of 0.0131, t-statistic of 0.1594 and p-value of 0.8880.It is hence statistically undistinguished at significance degree a = .05 as P & gt ; 0.05. There are 5 observations and 3 regressors ( intercept and ten ) so we use t ( 5-3 ) =t ( 2 ) .For illustration, for HH SIZE P = =TDIST ( 0.796,2,2 ) = 0.5095. 2.3.5 Test Hypothesis on a Regression Parameter Here we test whether HH SIZE has coefficient & A ; szlig ; 2 = 1.0. Example: H0: & A ; szlig ; 2 = 1.0 against Ha: & A ; szlig ; 2? 1.0 at significance degree a = .05. ThenT = ( b2 – H0 value of & A ; szlig ; 2 ) / ( standard mistake of b2 ) = ( 0.33647 – 1.0 ) / 0.42270 = -1.569.2.3.5.1 Using the p-value attackp-value = TDIST ( 1.569, 2, 2 ) = 0.257. [ Here n=5 and k=3 so n-k=2 ] .Do non reject the void hypothesis at degree.05 since the p-value is & gt ; 0.05.2.3.5.2 Using the critical value attackWe computed t = -1.569The critical value is t_.025 ( 2 ) = TINV ( 0.05,2 ) = 4.303. [ Here n=5 and k=3 so n-k=2 ] .So make non reject void hypothesis at degree.05 since T = |-1.569| & lt ; 4.303.2.3.6 Overall Test of Significance of the Regression Parameters We test H0: & A ; szlig ; 2 = 0 and & A ; szlig ; 3 = 0 versus Hour angle: at least one of & A ; szlig ; 2 and & A ; szlig ; 3 does non equal nothing. From the ANOVA tabular array the F-test statistic is 4.0635 with p-value of 0.1975. Since the p-value is non less than 0.05 we do non reject the void hypothesis that the arrested development parametric quantities are zero at significance degree 0.05. Conclude that the parametric quantities are jointly statistically undistinguished at significance degree 0.05. Note:Significance F in general = FINV ( F, k-1, n-k ) where K is the figure of regressors including the intercept. Here FINV ( 4.0635,2,2 ) = 0.1975. 2.3.7 Predicted Value of Y Given Regressors See instance where x = 4 in which instance CUBED HH SIZE = x^3 = 4^3 = 64. yhat = b1 + b2 x2 + b3 x3 = 0.88966 + 0.3365-4 + 0.0021-64 = 2.37006 2.3.8 Excel Restrictions Arrested development in Excel has a figure of restrictions:No standardized coefficients. It was really hard to construe unstandardised coefficients. The standardized coefficients could be calculated utilizing the unstandardised coefficient if it is needed.Lack of diagnostic graphs. The standard diagnostic graphs were non available in Excel, such as the secret plan of the remainders, the scatter-plot or remainders against predicted values.Lack of Diagnostic statistics. There were no co-linearity nosologies, which would supply a more apprehension of the informations that was analyzed.Excel standard mistakes and t-statistics and p-values are based on the premise that the mistake is independent with changeless variable. Excel does non supply alternaties, such autocorrelation criterion mistakes and t-statistics and p-values.3 Decision 4 Mentionhypertext transfer protocol: //www.qimacros.com/qiwizard/regression.htmlhypertext transfer protocol: //mallit.fr.umn.edu/fr4218/assigns/excel_reg.htmlhypertext transfer protocol: //www.jeremymiles.co.uk/regressionbook/extras/appendix2/excel/