Satellite. Solar system Essay Example for Free

Satellite. Solar system Essay A satellite is defined as any object that orbits any other object. Satellites can be celestial, such as a moon orbiting a planet in the solar system, or a planet in the solar system orbiting the sun. Satellites can also be man-made. Man-made satellites are typically launched into outer space from earth to collect data, photos and other information about Earth and all the many things that exist around it. An animation depicting the orbits of GPS satellites in medium earth orbit. A full size model of the Earth observation satellite ERS 2  In the context of spaceflight, a satellite is an object which has been placed into orbit by human endeavor. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon. The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. Since then, thousands of satellites have been launched into orbit around the Earth. These originate from more than 50 countries and have used the satellite launching capabilities of ten nations. A few space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Venus, Mars, Jupiter and Saturn. Satellites are used for a large number of purposes. Common types include military and civilian Earth observation satellites, communications satellites, navigation satellites, weather satellites, and research satellites. Space stations and human spacecraft in orbit are also satellites. Satellite orbits vary greatly, depending on the purpose of the satellite, and are classified in a number of ways. Well-known (overlapping) classes include low Earth orbit, polar orbit, and geostationary orbit. Satellites are usually semi-independent computer-controlled systems. Satellite subsystems attend many tasks, such as power generation, thermal control, telemetry, attitude control and orbit control. HISTORY OF ARTIFICIAL SATELLITES Sputnik 1: The first artificial satellite The first artificial satellite was Sputnik 1, launched by the Soviet Union on October 4, 1957, and initiating the Soviet Sputnik program, with Sergei Korolev as chief designer. This in turn triggered the Space Race between the Soviet Union and the United States. Sputnik 1 helped to identify the density of high atmospheric layers through measurement of its orbital change and provided data on radio-signal distribution in the ionosphere. The unanticipated announcement of Sputnik 1s success precipitated the Sputnik crisis in the United States and ignited the so-called Space Race within the Cold War. Sputnik 2 was launched on November 3, 1957 and carried the first living passenger into orbit, a dog named Laika. TYPES OF SATELLITE ïÆ'ËœCommunication satellites †¢Communication satellites provide a worldwide linkup of radio, telephone, and television. †¢The first communication satellite was Echo 1, launched in 1960. †¢Relay 1 and telstar 1 were the first active communications satellites. †¢They were launched in 1962. ïÆ'ËœNavigation satellites †¢Navigation satellites are mainly intended to help aircraft, ships and nuclear submarines. †¢These satellites provide constant signals by which aircraft and ships can determine their positions with great accuracy. ïÆ'ËœWeather satellites †¢Weather satellites carry cameras and other instruments pointed toward Earths atmosphere. †¢They can provide advance warning of severe weather and are a great aid to weather forecasting. ïÆ'ËœMilitary satellites †¢ Many military satellites are similar to commercial ones, but they send encrypted data that only a special receiver can decipher. †¢ Military surveillance satellites take pictures just as other earth-imaging satellites do, but cameras on military satellites usually have a higher resolution. ïÆ'ËœScientific satellites †¢Earth-orbiting satellites can provide data to map Earth, determine the size and shape of Earth, and study the dynamics of the oceans and the atmosphere. †¢ Scientists also use satellites to observe the Sun, the Moon, other planets and their moons, comets, stars, and galaxies. HOW ARE SATELLITES LAUNCHED ïÆ'ËœThe trick when launching a satellite is to get it high enough to do its job without losing the capsule to outer space. ïÆ'Ëœ Its a delicate balance of push and pull, accomplished by the inertia of the moving object and the Earths gravity. GEOSYNCHRONOUS SATELLITE LAUNCH VEHICLE ïÆ'ËœThe Geosynchronous Satellite Launch Vehicle (usually known by its abbreviation, GSLV) is an expendable launch system operated by the Indian Space Research Organization (ISRO). ïÆ'ËœIt was developed to enable India to launch its INSAT-type satellites into geostationary orbit and to make India less dependent on foreign rockets. GSLV Geosynchronous Satellite Launch Vehicle FunctionMedium Lift Launch System ManufacturerISRO Country of origin India Size Height49 metres (161 ft) Diameter2.8 metres (9 ft 2 in) Mass402,000 kilograms (890,000 lb) Stages3 Capacity Payload to LEO 5,100 kilograms (11,000 lb) Payload to GTO 2,000 to 2,500 kilograms (4,400 to 5,500 lb) Launch history StatusActive Launch sitesSatish Dhawan Total launches6 (5 Mk.I, 1 Mk.II) Successes2 (Mk.I) Failures3 (2 Mk.I, 1 Mk.II) Partial failures1 (Mk.I) Maiden flightMk.I: 18 April 2001 Mk.II: 15 April 2010 Boosters (Stage 0) No boostersFour Engines1 L40H Vikas 2 Thrust680 kilonewtons (150,000 lbf) Total thrust2,720 kilonewtons (610,000 lbf) Specific impulse 262 sec Burn time160 seconds FuelN2O4/UDMH First Stage Engines1 S139 Thrust4,700 kilonewtons (1,100,000 lbf) Specific impulse 166 sec Burn time100 seconds FuelHTPB (solid) Second Stage Engines1 GS2 Vikas 4 Thrust720 kilonewtons (160,000 lbf) Specific impulse 295 s (2.89 kN†¢s/kg) Burn time150 seconds FuelN2O4/UDMH Third Stage (GSLV Mk.I) 12KRB Engines1 KVD-1 Thrust69 kilonewtons (16,000 lbf) Specific impulse 460 s (4.5 kN†¢s/kg) Burn time720 seconds FuelLOX/LH2 Third Stage (GSLV Mk.II) CUS12 Engines1 ICE Thrust73.5 kilonewtons (16,500 lbf) Specific impulse 460 s (4.5 kN†¢s/kg) Burn time720 seconds FuelLOX/LH2 LIQUID BOOSTERS One of the strap-ons of GSLV-F04 being brought to the Vehicle Assembly Building The GSLV uses four L40 liquid strap-on boosters derived from the L37.5 second stage, which are loaded with 40 tons of hypergolic propellants (UDMH N2O4). The propellants are stored in tandem in two independent tanks 2.1 m diameter. The engine is pump-fed and generates 680 kN (150,000 lbf) of thrust. First stage S139 stage is 2.8 m in diameter and is made of M250 grade maraging steel and it has a nominal propellant loading of 139 t. Second stage The second stage is powered by the Vikas engine. It has 2.8 m diameter and uses 37.5 metric tons of liquid propellants with UDMH as fuel and nitrogen tetroxide (N2O4) as oxidizer, in two aluminium alloy compartments separated by a common bulk head. It delivers 720 kN (160,000 lbf) of thrust. Third stage GSLV Mk.II D3 The third stage is propelled by a cryogenic rocket engine, 2.8 m in diameter and uses liquid hydrogen (LH2) and liquid oxygen (LOX) in two separate tanks of aluminium alloy interconnected by an inter-stage. Propellant loading is 12.5 t. The indigenous cryogenic engine was built in Tamil Nadu at the Liquid Propulsion Systems Centre. POLAR SATELLITE LAUNCH VEHICLE ïÆ'ËœThe Polar Satellite Launch Vehicle commonly known by its abbreviation PSLV is an expendable launch system developed and operated by the Indian Space Research Organization (ISRO). ïÆ'ËœIt was developed to allow India to launch its Indian Remote Sensing (IRS) satellites into sun synchronous orbits. ïÆ'ËœPSLV can also launch small size satellites into geostationary transfer orbit (GTO). ïÆ'ËœThe PSLV has launched 41 satellites (19 Indian and 22 from other countries) into a variety of orbits till date. Polar Satellite Launch Vehicle PSLV-C8 (CA Variant) carrying the AGILE x-ray and ÃŽ ³-ray astronomical satellite of the ASI lifting off from Sriharikota FunctionMedium Lift Launch System ManufacturerISRO Country of origin India Size Height44 metres (144 ft) Diameter2.8 metres (9 ft 2 in) Mass294,000 kilograms (650,000 lb) Stages4 Capacity Payload to LEO 3,250 kilograms (7,200 lb) Payload to HCO 1,600 kilograms (3,500 lb)[1] Payload to GTO 1,060 kilograms (2,300 lb)[1] Launch history StatusActive Launch sitesSriharikota Total launches17 PSLV: 10 PSLV-CA: 6 PSLV-XL: 1 Successes15 PSLV: 8 PSLV-CA: 6 PSLV-XL: 1 Failures1 (PSLV) Partial failures1 (PSLV) Maiden flightPSLV: 20 September 1993 PSLV-CA: 23 April 2007 PSLV-XL: 22 October 2008 Notable payloadsChandrayaan-1 Boosters (Stage 0) â„â€" boosters6 Engines1 solid Thrust502.600 kN Specific impulse 262 sec Burn time44 seconds FuelHTPB (solid) First stage Engines1 solid Thrust4,860 kN Specific impulse 269 sec Burn time105 seconds FuelHTPB (solid) Second stage Engines1 Vikas Thrust725 kN Specific impulse 293 sec Burn time158 seconds FuelN2O4/UDMH Third stage Engines1 solid Thrust328 kN Specific impulse 294 sec Burn time83 seconds FuelSolid Fourth stage Engines2 liquid Thrust14 kN Specific impulse 308 sec Burn time425 seconds FuelMMH/UDMH PSLV is designed and developed at Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram and Kerala. The inertial systems are developed by ISRO Inertial Systems Unit (IISU) at Thiruvananthapuram. The liquid propulsion stages for the second and fourth stages of PSLV as well as the reaction control systems are developed by the Liquid Propulsion Systems Centre (LPSC), also at Thiruvananthapuram. The solid propellant motors are processed by Satish Dhawan Space Centre SHAR, which also carries out launch operations. After some delays, the PSLV had its first launch on 20 September 1993. Although all main engines performed as expected, an altitude control problem was reported in the second and third stages. After this initial setback, ISRO met complete success with the third developmental launch in 1996. Further successful launches followed in 1997, 1999, and 2001. PSLV continues to be the work horse of Indian satellite launches, especially for LEO satellites and the Chandrayaan Projects. It has undergone several improvements with each subsequent version, especially those involving thrust, efficiency as well as weight. ORBIT ïÆ'ËœAn orbit is a regular, repeating path that an object in space takes around another one. ïÆ'ËœAn object in an orbit is called a satellite. A satellite can be natural, like the moon, or human -made. ïÆ'ËœIn our solar system, the Earth orbits the Sun, as do the other eight planets. ïÆ'ËœThey all travel on or near the orbital plane, an imaginary disk-shaped surface in space. ïÆ'Ëœ All of the orbits are circular or elliptical in their shape. In addition to the planets orbits. HOW A SATELLITE STAY IN THE ORBIT ïÆ'ËœThe forward motion of the satellite is its momentum. If the gravity of the earth is not acting on the satellite, the satellite would continue in one direction. ïÆ'ËœThe swinging of the satellite gives it its forward motion. ïÆ'Ëœ When these two forces are equal, the satellite remains in orbit, without falling into or flying away from the Earth. ïÆ'Ëœ A satellites forward motion is controlled by rockets. ïÆ'ËœWhen the rockets are not fired, inertia keeps the satellite going in one direction. HOW SATELLITES WORK ïÆ'ËœReceiving uplinked radio signals from earth satellite transmission stations (antennas). ïÆ'ËœAmplifying received radio signals ïÆ'ËœSorting the input signals and directing the output signals through input/output signal multiplexers to the proper downlink antennas for retransmission to earth satellite receiving stations (antennas). MERITS ïÆ'ËœIn communication. ïÆ'ËœFor military purposes. ïÆ'ËœFor weather broadcasting. ïÆ'ËœIn terrestrial application. ïÆ'ËœSatellite Services. †¢Satellite internet access †¢Satellite phone †¢Satellite radio †¢Satellite television †¢Satellite navigation DE-MERITS ïÆ'ËœLifetime of a satellite is limited. ïÆ'ËœOnce damaged it is difficult to repair. ïÆ'ËœEconomically costly. ïÆ'ËœA small damage in any part can destroy the whole satellite. CONCLUSION ïÆ'ËœNow a day’s satellite is a basic communication media. ïÆ'ËœAny information can be transmitting from one point to another with the help of satellite. ïÆ'ËœAll people are using satellites directly or indirectly. ïÆ'ËœWithout satellites the days cannot be imagined.

Late Development And The Challenges Facing Late Developers Economics Essay

Late Development And The Challenges Facing Late Developers Economics Essay On the world stage, the list of the wealthiest countries has been dominated by European nations for the past six hundred years. Mid-last century a shift occurred that has seen the emergence of Asian countries growing at rapid rates. The surge was led by Japan and was quickly followed by those now known as the Asian Tigers. What problems did these countries overcome to grow so quickly while at the same time so many other nations are trapped in the quagmire of poverty and debt? Additionally, what challenges do the countries attempting development later than others face if they wish to emulate the Asian Tigers? This essay will briefly explain the problem of late development before outlining the challenges faced by late developers. Broadly speaking development implies wish to shift from an undesired state to a more desirable state; in this case a movement away from the situation of inequality and poverty to that of more equality and less poverty. Inequality in terms of social, cultural, economic and political needs is widespread in the world, not just between nations but within populations of nations. Such inequality leads to the poverty experienced by the populations of the undeveloped and developing nations of the word, causing millions of needless deaths every year around the world. Before any explanation or hypothesis regarding development of nations can be carried out, the term poverty requires discussion. An orthodox view of poverty is not having sufficient money to buy food and other basic material needs  [1]  . An alternate view of poverty is where people are not able to meet their own material and non-material needs through their own effort. The subtle difference between the two definitions will be expanded later in this essay. Additional to discussing poverty, the term development needs discussion. To determine the status of a nation as developed, developing or underdeveloped requires the use of a metric, criterion or standard of some kind. Which form of measure is hotly debated and is a very contentious issue. Different measures that can be used are national gross domestic product (GDP) per capita, level of economic industrialization or the Human Development Index (HDI) to name a few and the selection of which one determines the rankings of nations. During the Cold War, the terms First, Second and Third World were used to describe the USA, Soviet and non-aligned blocks of countries. The term Third World became synonymous with underdeveloped and developing countries and to this day is misused to describe these countries. THE PROBLEMS OF LATE DEVELOPMENT The same problems face developing countries, regardless of the metric used to measure a nations development ranking. The prime problem facing developing nation is their late start compared to the more advanced industrialised countries that are generally accepted as being developed. Late development precludes nations from using the first mover advantages of economies of scale, positive network effects and the ease of sourcing investment funds  [2]  . Nations that get a head start in an industry have the ability to compete evenly against other nations starting at the same time in that industry. As capacity builds, the high costs of initial production, research and development, and low levels of output alter because of innovation and improvement leading to more effective and cheaper production methods, enhanced products, and higher levels of output. All these factors enable the distribution of fixed costs, such as production and transport costs, across the greater output, thus lowering the final cost of an item. These economies of scale enable the first mover to produce a product at a lower cost than a late developer, which in turn, allows the first mover to either undercut late starters or make more profit when selling at the same price  [3]  . Late developers hence need to find ways around the economies of scale factor such as using cheaper local labour for production, leveraging off any local raw materials or new areas to in novate. A good example of the economies of scale at work is the early motor vehicle industry. The Ford Motor Company is generally credited with the first use of a production line type manufacturing method in the automotive industry that enabled Ford to mass produce cars at prices much cheaper than the completion. Follower companies adopted the same technology, but not after Ford had gained a significant market share in North America and enabled the company to create a world-wide manufacturing base that was not seriously challenged for over half a century  [4]  . Starting an industry or sector of technology first attracts people and firms into the area where that technology is found, thus creating a centre of excellence in terms of equipment and personnel. The network effect  [5]   of a centre of excellence also adds to the economics of scale effects, as raw material supplies are only shipped into one area and conversely distribution centres can also be centralised. Additionally, distributed manufacturing within such a network is sped up and costs reduced due to close proximity, thus reducing costs and time effects. Late starters wishing to build their own competing centres of excellence face the obstacle of attracting expertise away from established areas. The inability to match wage rates and favourable conditions of established centres of excellence need to be countered at the new location, often by government subsidies, low tax rates and favourable trade conditions. Well known examples of successful secondary centres of excellence are the Japanese automotive industry following America and the New Zealand and Australian movie production centres following in the footsteps of Hollywood and Bollywood. The effects of globalisation and easy flow of information and technology are continuing to reduce the need to physically concentrate people and industry; hence the network effects are being reduced for the first mover. Sourcing investment funds for any new industry is a challenge, yet sourcing funds to compete against a developed nations established industry is even more difficult. The first mover nations have the advantage of having the first opportunity to attract investment capital, whether internal to the nation or externally via foreign investment. Regardless of the source of investment funds, late developers seeking funding must compete against established industries with proven return rates and known levels of risk, therefore pay higher interest rates. These higher interest rates further erode the profit margin of the late developer and make their products less attractive on price and company success rates lower. THE CHALLENGES FACING LATE DEVELOPERS In light of the problems face by late developers, why is striving for development so important? United Nations former Secretary General Kofi Annan described a developed country as one that allows all its citizens to enjoy a free and healthy life in a safe environment implying that developing and undeveloped countries citizens do not enjoy a free and healthy life in a safe environment. The orthodox, or liberalist, view of development describes its purpose as the requirement to move from a subsistence economy to an industrialised and modern economy  [6]  . Compare such a view with the alternate or more socialist view, where the purpose of development is to create human well-being through sustainable societies in social, cultural, economic and political means. These two viewpoints differ significantly but suffer from overlapping sets of challenges that need addressing to successfully develop a nation. The orthodox view of development identifies a strong trend between development and industrialisation. This view sees industrialisation as a better path for growth of a nation than agriculture or resource extraction as there is a greater potential for capital accumulation. This growth is due to the higher productivity achieved with successful industrialisation, which in turn leads to better wage growth, better skill and expertise growth, and the unlimited potential of the free-market. Such an approach generally requires a top-down governmental control process, using external capital investment to attract technology and stimulate private sector growth. Using industrialisation as the pathway to growth and development has the disadvantages of exposing a nation to both the good and bad aspects of globalisation. Fast and freer information flows, financial deregulation, access to technology and exposure to the global villages cultural influence can have positive and negative effects on both markets and populations. The effects of global financial institutions such as the World Bank, International Monetary Fund and open finance markets can lead to a nations own monetary policy having little control on capital availability and exchange rate control; a critical factor in ensuring a stable economy  [7]  . Ostensibly, small and vulnerable nations can be either manipulated easily or must flow global trends with few ability to cause self-determination in the globalised finance market. The alternate view of development takes a different approach to development. In this view the final target of development is not necessarily parity with developed nations using convention metrics, such as GDP per capita, but a more holistic vision of a journey towards self-sufficiency, self-reliance and unity rather than outright fiscal wealth. In this respect, development is more a process rather than a target. The fundamental difference to the orthodox view is that the alternate view is a bottom up process and involves the respect of nature and culture, political inclusion of marginalised groups and local control of resources and investments. Comparing the two very different approaches identifies that there are challenges to both, including some common challenges. The orthodox view has the advantage of potentially providing greater growth rates and hence reducing inequality between nations, but often at the cost of higher internal inequality as the gap between the richest and poorest within a nation widens. This effect is sometimes called the unavoidable consequence of economic growth  [8]  . Opponents to the orthodox view also content that sustained development is only viable through further growth within a global free-market, which benefits the suppliers of the initial capital more than the nation seeking development  [9]  . Conversely, the alternate view of development suffers the potential problem of creating slower growth rates than embracing outright industrialism and its side effects. This approach also requires assistance from external to the country, but more often in the form of education and material re sources, rather than direct capital injection. The Chipko movement in India and the rubber tapper movement in the Amazon are examples of successful grass roots versions of the alternate development methods  [10]  . Both are relatively small scale and limited to regions and ethnicities rather than whole nations. Both approaches suffer from the challenges of overcoming education, literacy, environmental and health issues which all slow rates of growth. Additionally, corruption is seen as a huge obstacle to developing nations, specifically in autocratic and flawed democracies. Later in the development cycle nations that grow strongly need to be able to keep their exchange rate competitive by neutralize the tendency of the exchange rate to head toward overvaluation  [11]  . This problem is related to the Dutch disease  [12]  , the policy of growth with foreign savings, and to exchange rate populism. CONCLUSION In summary, it can be seen that development of countries is import to reduce the gap between the most advanced nations in the world and the least. Development leads to a reduction in suffering by people who cannot meet their own needs through their own means, while at the same time enabling societies to become sustainable in economic, political and cultural terms. The process of development is slow and the challenges are many. Overcoming the problems of being a late developer is complex and difficult, but demonstrably possible as the Asian Tiger nations and other Newly Industrialised Countries have proven. Striving to industrialise by increasing exports has been a successful development strategy for the Asian Tiger countries, but not all nations have been successful using this technique. Local political, geographical and geological environments can both help and hinder development, as can the effects of globalisation by open both market and financial flows. While the history of development success shows that the crux of change is primarily national and local, such change now takes place in an increasingly globalised world of ever tighter political, economic, and cultural ties. The problems faced by developing nations are many and no universal answer or solution exists. Each nation that wishes to develop needs to create a development plan unique to their nation, based on their specific politics, cultures, resources, skills and geography. Only then can real and sustains development occur. Word Count = 2050

Analyse The Factors Contributing To Language Maintenance Education Essay

Analyse The Factors Contributing To Language Maintenance Education Essay In countries of significant migration, like Australia, newly arrived settlers from non-English speaking countries need to become bilingual, adding to fluency in their own language at least some fluency in English. With the passage of time, perhaps generations, families may find that their ethnic language becomes lost to them. Many consider that this loss is not only a loss for families and individuals, but that it is also a loss for the community at large. For the purposes of this essay, the term language maintenance is used to refer to the ability of ethnic communities, families and individuals to maintain their own language while adapting to the language of their new country. This essay will consider the factors which appear to influence the maintenance of a language, focusing on some of the more powerful social and psychological forces which propel individuals towards the continued learning and maintenance of a minority language. There seems to be little doubt among the researcher s that attitudes influence language maintenance. In fact, attitudes towards the minority language and culture appear to underlie the other relevant factors, which include sense of ethnic identity, motivation and family support. These factors will be dealt with in turn in this essay. There is a considerable body of evidence that attitudes to the ethnic language and culture influence language maintenance. In order to consider attitudes towards a language, one needs to consider what makes a language valuable. According to Edwards (1985), greater possibilities of employment and acceptance by the community that speaks the language are some valuable qualities. Factors that devalue a language would include the embarrassment some children feel about parents use of the minority language in public when the children want to conform. Gardner (1985) has produced and reviewed studies attempting to establish a relationship between attitudes towards a language and culture and motivation to practise the language and participate in that culture. He concludes on the basis of the research that attitudes are fairly consistently related to achievement in a language. Political issues obviously affect attitudes and Romaine (1989, p. 42), in dealing with the effect of ties with the home land on language maintenance, wrote that refugees often reject the language of the oppressive regime and try to assimilate to the new culture as quickly as possible. An individuals and communitys sense of ethnic identity appears to have a profound influence on language maintenance. Issues of identity are extremely personal and often emotional, interwoven as they are with personality. One expects the extent to which a person identifies with his/her ethnic background to influence the motivation behind maintenance of the ethnic language. Some studies (e.g. Bentahila and Davies, 1992) have disputed this expectation. It appears that it is possible for a speech community to value its ethnic background and language highly though not passing it on to their children, possibly for utilitarian reasons. Or language may not be considered a core value of ethnic identity, as with the Dutch community in Australia, which tends not to maintain the Dutch language over generations (Clyne, 1982). The Dutch community in Australia, according to Smolicz and Secombe (1979), is a group that does not consider it very important to retain its own culture as distinct to that of the dominant majority. Poles and Greeks, however, are language-centred cultures, in which language is considered an important and defining aspect of group membership. These communities, according to Clyne (1979), do maintain their languages well. It thus appears that a strong sense of ethnic identity is an important factor contributing to language maintenance as long as language is considered an important part of that identity. Research indicates that motivation is also strongly related to the successful learning and maintenance of a language. A great deal of work has centred around the distinction between integral and instrumental motivation. Integrative motivation (for example interest in and liking of the language and those who speak it) derives from positive attitudes towards the target language group and the desire and potential for integrating with that group. Instrumental motivation involves utilitarian feelings like knowing that the language may improve ones opportunities for employment. Most researchers suggest that integrative motivation is a more powerful factor in promoting language maintenance, but Clyne (1979) points out that acceptance of a language as an examination and/or school subject is a major factor in German and Dutch language maintenance, and one can assume that this has been an important factor in maintenance of the key languages indicated by the National Language Policy of 1987 for teaching in the Department of Education. It seems clear that motivation of both types play a role in language maintenance. Perhaps the most fundamental issue to be taken into account when considering language maintenance is family support for the continued use of the ethnic language. Dennison (1977 in Edwards 1985) noted that the most direct cause of language loss is lack of transmission to children. According to Fantini (1985, p. 197), Language is the childs passport for entry into a social group, or a cultural community. Two languages permit the child to enter into and acquire the world views of two communities.For these views to exist in harmony rather than in conflict, favourable attitudes on the part of those who surround the child are essential to permit him to grow up a well-adjusted individual, comfortable in either community. Gardner (1985) distinguished between the active and passive role played by parents. The active role includes parental encouragement to succeed, monitoring of performance and reinforcement of success (negative active roles would include agreement that a language is a waste of time or an intrusion on more important subject areas). The passive role involves parental attitudes toward the second language community, reinforcing or weakening the integrative motive. Gardner concludes that passive supports, these parental attitudinal reactions to the language community, are what are remembered most when children reflect on parental encouragement to maintain and learn a language. The support of parents should definitely be taken into account when considering language maintenance, since the fundamental cause of language loss or attrition is failure to pass it on to the next generation. In summary, it appears that the underlying factor determining language maintenance is attitude towards the language and ethnic community. These attitudes appear to be closely related to sense of ethnic identity, motivation and, in particular, parental support. There is considerable evidence and weight of opinion that they are all important factors which could determine whether or not individuals or groups are likely to keep a minority language alive in themselves and/or in the community.

Julius Caesar Essay -- essays research papers

SUMMARY: Shakespeare's Julius Caesar is the story of the resulting conflicts from the assassination of perpetual dictator and Roman emperor, Julius Caesar. A great friend of Caesar, Mark Antony, comes to the senate to see the dead body of their dictator. He pretends to not be angry at those who took part in the assassination, and asks to speak at his funeral, a request which he is granted. However, after the men leave, he begins a soliloquy in which he suggests that Caesar's spirit will take revenge upon his murderers and invoke a war involving the entire country. Antony begins the revenge of his death by speaking at the funeral about the wrong done to Caesar, the man's generosity to the people, and how Brutus tried to persuade them to believe his justification of the murder. The crowd turns to agreement with Antony and then accuse the conspirators of murder. The accused men flee, eventually leaving the bounds of the city, and the citizens leave to loot and burn the houses of the guilty men. The armies of Brutus and Cassius set up camps near another city and knowing that Antony's soldiers are coming, they decide to march toward the enemy at once. The fighting begins with the confrontation of the two sides, as Cassius' and Brutus' armies arrive. Antony and his partner challenge the assassins to fight, and the bloody battle begins. The armies of the conspirators fall into vulnerability many times, and their side does poorly, losing many men. Cassius hears mistakenly that one...

Philosophy - Aristotle’s Concept of Virtue and the Comic Strip of Calv

Aristotle’s Concept of Virtue and the Comic Strip of Calvin and Hobbes One of the many questions with which Aristotle is concerned in the Nicomachean Ethics is: What is virtue and who is the virtuous man? However, this question of virtue is not considered in a vacuum. Aristotle’s discussion, far from amounting to mere ethereal musings, is firmly grounded in the everyday of life and consideration. So, in discussing the ideas of Aristotle, it is appropriate, and even necessary, that we ground our discussion in a like manner. That is, we should turn to a concrete example in order to help clarify Aristotle’s discussion of virtue in the Ethics. Thus we are presented with our first dilemma: who to choose as this "concrete example" of which we have spoken. In order to determine this, we should first determine to whom it is that Aristotle addresses himself and his discussion, as it will obviously do us no good to attempt to apply the ideas which Aristotle sets forth to a personage whom he discounts or, at least, to whom he merely does not address himself. In general, it is fair to say that Aristotle attempts to address the bulk of mankind. In doing so, Aristotle assumes some very basic morality as a grounds for the proceeding discussion, and those who expect the discussion to be applicable to their own lives must have done the same. That is, "to be a competent student of what is right and just, and of politics generally, one must first have received a proper upbringing in moral conduct" (Arist. 1.4.5).1 In addition, integral to the discussion is the geography of the soul which Aristotle provides, and thus it would be helpf ul in our concrete example if it were also to provide a somewhat tangible expression of this juxtaposi... ...ng good when one has an innate inclination towards evil. Closeup on Calvin as he packs snow in his hands, forming a snowball. Calvin: I think one good act by me, even if it’s just to get presents, should count as five good acts by some sweet tempered kid motivated by the pureness of his heart. Don’t you? Susie Durkins (Calvin’s archenemy) enters the frame. Calvin’s arm is cocked with the snowball in hand. Hobbes is barely visible in the frame, but it is important to note he has reverted to his stuffed-animal state. Calvin: Hey Susie! The snowball hits Susie in the back of the head with a "POW!" knocking her to the ground. Calvin and Hobbes (now in his live-animal state) sprint across the snow in flight. Hobbes: Of course, in your case the question is academic. Calvin: I wanted to put a rock in the snowball, but I didn’t! That should be worth a lot!

Global world challenges for muslim

Globalization has a big influence to Muslim populations and it brings huge impacts to the world in every single aspect. Plus, global economy is one of the greatest things happened directly proportional to the rise of globalization. The concept of globalization brings the culture of being competitive among people and surely Muslims are Included. Countries around the world compete with each other In order to gain the superpower as the top global nations.Though America Is believed to be eager in the near future, but still its influence on the global economy will probably make them to remain strong. This can be seen through the efforts made by the United States nation showing their ability to resolve global crises and their soft power in the field of economy (New Straits Times, 2012). In that matter, they will be able to fight against Incoming competitors to surpass them so that they will remain being the first among equal. However, for Muslims communities,TLS phenomenon has become a cha llenge for them as the chances in dominating the global economic sector still far way.As Muslims have lesser chances to be as one of the top rank countries, they tend to follow and adapt what have been posed by the Western. Instead of creating an innovative ideas and great productivity, these issues will create an unhealthy culture among Muslims communities where they will belief behind In economic- based sector and thus, becoming passive communities. In short, less attention given to Muslims has actually become a minor obstacle for this population to move forward towards success.In addition to that, most Muslims who are living in underdeveloped entries are facing a big problem of dominating the world economics even to get involved the global economic sectors is another issue. As a result to fewer chances provided for Muslims in this sector, this will only reduce or limit the Muslims' achievement towards the success of this sector. Surely, Muslims will not be able to show the world their talents In organizing this economic field so that to gain others' certainty about their own ablest that the world has misinterpreted for every now and then.Likewise, the world will see Muslims as weak, fragile and useless communities living together in a small alienated population. To add this, Hannah, (n. D) also comes out with a smart argumentation saying that human resources act as path to the development of Muslim communities. This however explains the critical element, human resources need attention from Muslims community If they aspire to be significant In the global economic. In other words, the economic growth will likely be depended on the human productivity values itself, which need to be developed and strengthened due to recent global competition.Another element which also becomes a great challenge for Muslim populations in the immediate future is education. Education has becomes great indicator to measure the development of certain countries and communities, since education shapes the future of a country whether to be success or not. The world perceives changed easily through great education and knowledge. The problem in education arises when Muslims are not given the same and equal chance to seek knowledge like the Western people. People in Western country may have big opportunity in seeking knowledge as they own most of the great universities in the world.Warren Buffet, the intelligent investor, has shown the world how a brilliant guy survives to come the most successful person in the world. (Kenton, 2014) The excellence in academic does contribute much in constructing the strategies for Buffet to become a Billionaire today. Meanwhile, that opportunity does not happened in the same way for Muslim communities. As they have been isolated within a big community when they migrate to a Western country, they are not being given same privileges in education as well.The challenges faced by Muslims to further their studies become harder when there a re only limited chances in education provided for Muslim populations. This forever has a very much dependency with the aspect of Muslims' social background. To be cleared, most Muslim countries all around the world suffer the issue of poverty. Not only being the subject of poverty, Muslims are also subjected to discrimination and prejudices for they have always be seen as unimportant to become knowledgeable even to seek knowledge.All in all, Muslims who do afford to pay the high amount of educational fees will choose not to further their study to reduce their burden of having to pay expensive educational fees. This will result in their in their interest towards education, where they will be no longer interested to seek knowledge as they have been dropped out due to incomplete fees payment, as well as the lacking of formal education. Even though this case is quite common among Muslim countries, yet it also attacks the Western as well.For example, being a rich and well developed count ry like America has never stopped this country to urge their students with expensive educational fees. This will cause the school drop-outs to find other alternatives as a mean of continuing their life(Reemerged, n. D). In short, education plays as an important element which triggers one's well life being, thus the limitations in education among Muslim populations has become a prominent barrier for them to move forward. The problem of getting an education does not stop there. This is because, even Muslim communities have their own restrictions in seeking knowledge in some countries.This is what happens in Saudi Arabia in which the women have not been only restricted to seek knowledge, yet they are also not allowed to drive and authoritative the permission from their male guardians(â€Å"Saudi Arabia†, 2013). In other words, restriction to gain knowledge is also considered as one of the barriers happened within the Muslim communities that may lead to the declination of social development among populations. To have a great country also means to acquire a great society. Every culture and society in the world today is facing many complex moral and social challenges.The major issue in developing social values in the Muslim communities is the influences of social media. The development of human behavior begins at the early age of children. Being in rapid growth stage has however asses teenagers and children to Just follow blindly what they may perceive as true without having any detailed experimentation to it. This increases their chances to be and others. All in all, these can be seen through their peculiar attitudes as well as dressing style. Feller highlights the rise of pornographic elements in children's clothing in United States leads to further moral decline (Feeler, 2013).This culture is unhealthy because it promotes the unethical manners in dressing thus encourages teenagers to dress in that way. Len other words, minor factor sometimes can also be ra cial to a problem whether it helps to reduce the problem or to boost the problem causing it to be more serious. With no doubt, pornographic issue in dressing style has actualities the sub or minor contributor to the larger problem which are teenage pregnancy and baby dumping. This sounds shocking but it does happen. In Malaysia, for example, a Muslim country, the case of unwed teen pregnancy has reached to the critical stage (Shah, 2014) at this recent day.This issue is closely related to the moral declination where it is initiated by the improper education and guidance from parents. The statistic of four consequent years' research shows that more than one thousand unwed teen pregnancies have occurred in Malaysia, starting from 2010 to 2013. This indicates the huge number and most unpredictable statistic in Malaysia involving the under-age teenagers. According to Alicia Shah (2014), as cited in Mad Hussy, the total number of unwed teen pregnancies for two year between 2011 and 2012 is 8405 Another challenge which has always become a nightmare for the Muslims is ‘Claustrophobia'.It is understandable that challenges towards Muslims do not only occur in the field of economy, education and social but also in a way Muslims receive feedbacks from the people all over the world. To be cleared, Claustrophobia refers to a form of racism being labeled to Muslims (Marci, 2004). Without realizing, the voice of anti-Muslim has been rapidly spread to global world, especially in the Western country. Muslims have been viewed as terrorists in the eyes of Western people.Head (2013) agrees that, Western people have always misinterpreted Muslims as a symbol of violence besides of their intractability to make any changes whenever they have been asked to. Even though, it is not the actual guru that reflect the true Islam yet Muslims have suffered this for quite long time. According to Harmony, there are some misunderstandings of people's views, failure to differentiate between true Islam and extremism which later becomes the root of Claustrophobia(Harmony, 2014). Claustrophobia doesn't exist itself but it has been shaped by people's perspective.For example, the Western who are being too judgmental towards Muslims always reflects any bad deeds done by Muslims as a mean to describe Islam as a whole. Later, they conclude that Islamic teachings as a form of terrorism. In other word, Westerners bad perception towards Muslims can be reduced once they understand and open ways for Muslims to explain what Islam is all about. Plus, inabilities of Muslim communities themselves to give the correct picture of Islam also boost Claustrophobia. This is again used by teethe radical Islamic terrors to describe Islam as a whole.Likewise, Claustrophobia affects the entire world of Islamic community. The huge impact can be seen in Muslim territory after the official term of Claustrophobia has been claimed, declared and well spread to the whole Western countries. One example can be seen through the tragedy of 9/1 1 here Muslims have been blamed for that tragedy as well as the bombing of the world trade centre building. This lead to the establishment of many organizations Western land (â€Å"The year in hate and extremism†, 2014). The Claustrophobia has been portrays how social media gather all blames towards Muslims at any global issue of criminals.Moreover, the treatments Muslim at the West Country get are also dreadful to relief in that critical moment. Muslims have been pictured as bad, immoral, cruel and deviated from society. At the meantime, the world will not welcome Muslim populations even they keep increasing number every now and then. N short, this situation will spread the feeling of hatred on Muslim populations worldwide thus preventing Muslims to develop well (â€Å"Claustrophobia ‘explosion' in I-J†, 2002) After all, Muslims need some strategies to enhance their quality of life in the global world.As in the field of eco nomics, Muslims should be able to convince the world of their capabilities in economic-based sector. One best example to support this idea is that, Muslims should be more competitive with the outside world. This perhaps can be portrayed through the high-quality products of local Muslim populations being exported all over the world. As a result to this, the world especially the Western will at least start to rethink of their bad perceptions given to Muslim communities. Besides, Muslim leaders should make ways for Muslims to be among the global economic competitors.So that the respect and chances will help to build up and develop the whole country. This sector closely related to the achievement on the education and academic sector, where the people have to be educated to keep on producing the great, innovative and productive products and works in the global world. As for the education, the restriction is no longer relevant for Muslim immunities, since people are born to be developed w ith the knowledge they have. Plus, the restriction to gain education between genders should be vanished thus portraying men as being superior in all aspects of life than the women should be stopped.This can be proven throughout several great of women in today's world. Morocco can be considered as one among the other countries which realizes the importance of women's contribution in education for the country. To support this, Morocco does encourage its women to become the religious leaders to guide the society through the service of personal counseling. In short, with this great alternative will actually acts as a medium to provide Muslims with a better chance of being educated thus to prepare living in a world of high technology (Sultan, 2012).Muslim country has been figured as poor country among countries all over the world. So, in order to improve the level of current development of Muslim country, Muslims themselves need to strengthen the human resources that may indicate how str ong they are to survive in global power economically. Teenage must be observed by their parents or guardians at the most of their activities. Teenagers with high exposure to immoral and unhealthy activities may have a higher tendency to get involved with the social problems.

Evolution of Mobile Phone Technology

A mobile phone (also known as a cellular phone, cell phone and a hand phone) is a device that can make and receive telephone calls while moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. By contrast, a cordless telephone is used only within the short range of a single, private base station. In addition to telephony, modern mobile phones also support a wide variety of other services such as text messaging, MMS, email, Internet access, short-range wireless communications (infrared, Bluetooth), business applications, gaming and photography. Mobile phones that offer these and more general computing capabilities are referred to as smartphones. The first hand-held mobile phone was demonstrated by John F. Mitchell and Dr Martin Cooper of Motorola in 1973, using a handset weighing around 2. 2 pounds (1 kg). From 1990 to 2011, worldwide mobile phone subscriptions grew from 12. million to over 6 billion, penetrating about 87% of the global population and reaching the bottom of the economic pyramid. In 2012, for the first time since 2009 mobile phone sales to end users is declining by 1. 7 percent to 1. 75 billion units which is dominated by Samsung for 385 million units (53. 5 percent is smartphones) and Apple for 130 million units of all smartphones. History The first mobile tel ephone calls were made from cars in 1946. Bell System's Mobile Telephone Service was made on 17 June in St. Louis, Missouri, followed by Illinois Bell Telephone Company's car radiotelephone service in Chicago on 2 October. The MTA phones were composed of vacuum tubes and relays, and weighed over 80 pounds (36 kg).. John F. Mitchell, Motorola's chief of portable communication products in 1973, played a key role in advancing the development of handheld mobile telephone equipment. Mitchell successfully pushed Motorola to develop wireless communication products that would be small enough to use anywhere and participated in the design of the cellular phone. Martin Cooper, a Motorola researcher and executive, was the key researcher on Mitchell's team that developed the first hand-held mobile telephone for use on a cellular network. Using a somewhat heavy portable handset, Cooper made the first call on a handheld mobile phone on 3 April 1973 to his rival, Dr. Joel S. Engel of Bell Labs. As I walked down the street while talking on the phone, sophisticated New Yorkers gaped at the sight of someone actually moving around while making a phone call. Remember that in 1973, there weren't cordless telephones or cellular phones. I made numerous calls, including one where I crossed the street while talking to a New York radio reporter – probably one of the more dangerous things I have ever done in my life. Martin Cooper The new invention sold for $3,995 and weighed two pounds, leading to a nickname â€Å"the brick†. The world's first commercial automated cellular network was launched in Japan by NTT in 1979, initially in the metropolitan area of Tokyo. In 1981, this was followed by the simultaneous launch of the Nordic Mobile Telephone (NMT) system in Denmark, Finland, Norway and Sweden. Several countries t hen followed in the early-to-mid 1980s including the UK, Mexico and Canada. On 6 March 1983, the DynaTAc mobile phone launched on the first US 1G network by Ameritech. It cost $100m to develop, and took over a decade to hit the market. The phone had a talk time of just half an hour and took ten hours to charge. Consumer demand was strong despite the battery life, weight, and low talk time, and waiting lists were in the thousands. In 1991, the second generation (2G) cellular technology was launched in Finland by Radiolinja on the GSM standard, which sparked competition in the sector as the new operators challenged the incumbent 1G network operators. Ten years later, in 2001, the third generation (3G) was launched in Japan by NTT DoCoMo on the WCDMA standard. By 2009, it had become clear that, at some point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications like streaming media. Consequently, the industry began looking to data-optimized 4th-generation technologies, with the promise of speed improvements up to 10-fold over existing 3G technologies. The first two commercially available technologies billed as 4G were the WiMAX standard (offered in the U. S. by Sprint) and the LTE standard, first offered in Scandinavia by TeliaSonera. Handheld mobile phone Prior to 1973, mobile telephony was limited to phones installed in cars and other vehicles. [13] Motorola and Bell Labs raced to be the first to produce a handheld mobile phone. That race ended on 3 April 1973 when Martin Cooper, a Motorola researcher and executive, made the first mobile telephone call from handheld subscriber equipment, placing a call to Dr. Joel S. Engel of Bell Labs. The prototype handheld phone used by Dr. Cooper weighed 2. 5 pounds and measured 9 inches long, 5 inches deep and 1. 75 inches wide. The prototype offered a talk time of just 30 minutes and took 10 hours to re-charge. John F. Mitchell, Motorola's chief of portable communication products and Cooper's boss in 1973, played a key role in advancing the development of handheld mobile telephone equipment. Mitchell successfully pushed Motorola to develop wireless communication products that would be small enough to use anywhere and participated in the design of the cellular phone. Analog cellular networks – 1G The first analog cellular system widely deployed in North America was the Advanced Mobile Phone System (AMPS). It was commercially introduced in the Americas in 1978, Israel in 1986, and Australia in 1987. AMPS was a pioneering technology that helped drive mass market usage of cellular technology, but it had several serious issues by modern standards. It was unencrypted and easily vulnerable to eavesdropping via a scanner; it was susceptible to cell phone â€Å"cloning;† Many of the iconic early commercial cell phones such as the Motorola DynaTAC Analog AMPS were eventually superseded by Digital AMPS (D-AMPS) in 1990, and AMPS service was shut down by most North American carriers by 2008. Digital cellular networks – 2G In the 1990s, the ‘second generation' mobile phone systems emerged. Two systems competed for supremacy in the global market: the European developed GSM standard and the U. S. developed CDMA standard. These differed from the previous generation by using digital instead of analog transmission, and also fast out-of-band phone-to-network signaling. The rise in mobile phone usage as a result of 2G was explosive and this era also saw the advent of prepaid mobile phones. In 1991 the first GSM network (Radiolinja) launched in Finland. In general the frequencies used by 2G systems in Europe were higher than those in America, though with some overlap. For example, the 00 MHz frequency range was used for both 1G and 2G systems in Europe, so the 1G systems were rapidly closed down to make space for the 2G systems. In America the IS-54 standard was deployed in the same band as AMPS and displaced some of the existing analog channels. In 1993, IBM Simon was introduced. This was possibly the world's first smartphone. It was a mobile phone, pager, fax machine, and PD A all rolled into one. It included a calendar, address book, clock, calculator, notepad, email, and a touchscreen with a QWERTY keyboard. The IBM Simon had a stylus you used to tap the touch screen with. It featured predictive typing that would guess the next characters as you tapped. It had apps, or at least a way to deliver more features by plugging a PCMCIA 1. 8 MB memory card into the phone. Coinciding with the introduction of 2G systems was a trend away from the larger â€Å"brick† phones toward tiny 100–200g hand-held devices. This change was possible not only through technological improvements such as more advanced batteries and more energy-efficient electronics, but also because of the higher density of cell sites to accommodate increasing usage. The latter meant that the average distance transmission from phone to the base station shortened, leading to increased battery life whilst on the move. The second generation introduced a new variant of communication called SMS or text messaging. It was initially available only on GSM networks but spread eventually on all digital networks. The first machine-generated SMS message was sent in the UK on 3 December 1992 followed in 1993 by the first person-to-person SMS sent in Finland. The advent of prepaid services in the late 1990s soon made SMS the communication method of choice amongst the young, a trend which spread across all ages. G also introduced the ability to access media content on mobile phones. In 1998 the first downloadable content sold to mobile phones was the ring tone, launched by Finland's Radiolinja (now Elisa). Advertising on the mobile phone first appeared in Finland when a free daily SMS news headline service was launched in 2000, sponsored by advertising. Mobile p ayments were trialed in 1998 in Finland and Sweden where a mobile phone was used to pay for a Coca Cola vending machine and car parking. Commercial launches followed in 1999 in Norway. The first commercial payment system to mimic banks and credit cards was launched in the Philippines in 1999 simultaneously by mobile operators Globe and Smart. The first full internet service on mobile phones was introduced by NTT DoCoMo in Japan in 1999. Mobile broadband data – 3G As the use of 2G phones became more widespread and people began to utilize mobile phones in their daily lives, it became clear that demand for data services (such as access to the internet) was growing. Furthermore, experience from fixed broadband services showed there would also be an ever increasing demand for greater data speeds. The 2G technology was nowhere near up to the job, so the industry began to work on the next generation of technology known as 3G. The main technological difference that distinguishes 3G technology from 2G technology is the use of packet switching rather than circuit switching for data transmission. In addition, the standardization process focused on requirements more than technology (2 Mbit/s maximum data rate indoors, 384 kbit/s outdoors, for example). Inevitably this led to many competing standards with different contenders pushing their own technologies, and the vision of a single unified worldwide standard looked far from reality. The standard 2G CDMA networks became 3G compliant with the adoption of Revision A to EV-DO, which made several additions to the protocol whilst retaining backwards compatibility: * the introduction of several new forward link data rates that increase the maximum burst rate from 2. 45 Mbit/s to 3. 1 Mbit/s. * protocols that would decrease connection establishment time. the ability for more than one mobile to share the same time slot. * the introduction of QoS flags. All these were put in place to allow for low latency, low bit rate communications such as VoIP. The first pre-commercial trial network with 3G was launched by NTT DoCoMo in Japan in the Tokyo region in May 2001. NTT DoCoMo launched the first commercial 3G network on 1 October 2001, using the WCDMA technology. In 2002 the first 3G networks on the rival CDMA2000 1xEV-DO technology were launched by SK Telecom and KTF in South Korea, and Monet in the USA. Monet has since gone bankrupt. By the end of 2002, the second WCDMA network was launched in Japan by Vodafone KK (now Softbank). European launches of 3G were in Italy and the UK by the Three/Hutchison group, on WCDMA. 2003 saw a further 8 commercial launches of 3G, six more on WCDMA and two more on the EV-DO standard. In the mid 2000s (decade), an evolution of 3G technology begun to be implemented, namely High-Speed Downlink Packet Access (HSDPA). It is an enhanced 3G (third generation) mobile telephony communications protocol in the High-Speed Packet Access (HSPA) family, also coined 3. G, 3G+ or turbo 3G, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer speeds and capacity. Current HSDPA deployments support down-link speeds of 1. 8, 3. 6, 7. 2 and 14. 0 Mbit/s. Further speed increases are available with HSPA+, which provides speeds of up to 42 Mbit/s downlink and 84 Mbit/s with Release 9 of the 3GPP standards. By the end of 2007, there were 295 million subscribers on 3G networks worldwide, which reflected 9% of the total worldwide subscriber base. About two thirds of these were on the WCDMA standard and one third on the EV-DO standard. The 3G telecoms services generated over 120 Billion dollars of revenues during 2007 and at many markets the majority of new phones activated were 3G phones. In Japan and South Korea the market no longer supplies phones of the second generation. Although mobile phones had long had the ability to access data networks such as the Internet, it was not until the widespread availability of good quality 3G coverage in the mid-2000s (decade) that specialized devices appeared to access the mobile internet. The first such devices, known as â€Å"dongles†, plugged directly into a computer through the USB port. Another new class of device appeared subsequently, the so-called â€Å"compact wireless router† such as the Novatel MiFi, which makes 3G internet connectivity available to multiple computers simultaneously over Wi-Fi, rather than just to a single computer via a USB plug-in. Such devices became especially popular for use with laptop computers due to the added portability they bestow. Consequently, some computer manufacturers started to embed the mobile data function directly into the laptop so a dongle or MiFi wasn't needed. Instead, the SIM card could be inserted directly into the device itself to access the mobile data services. Such 3G-capable laptops became commonly known as â€Å"netbooks†. Other types of data-aware devices followed in the netbook's footsteps. By the beginning of 2010, E-readers, such as the Amazon Kindle and the Nook from Barnes & Noble, had already become available with embedded wireless internet, and Apple Computer had announced plans for embedded wireless internet on its iPad tablet devices beginning that Fall. Native IP networks – 4G By 2009, it had become clear that, at some point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications like streaming media. Consequently, the industry began looking to data-optimized 4th-generation technologies, with the promise of speed improvements up to 10-fold over existing 3G technologies. The first two commercially available technologies billed as 4G were the WiMAX standard (offered in the U. S. by Sprint) and the LTE standard, first offered in Scandinavia by TeliaSonera. One of the main ways in which 4G differed technologically from 3G was in its elimination of circuit switching, instead employing an all-IP network. Thus, 4G ushered in a treatment of voice calls just like any other type of streaming audio media, utilizing packet switching over internet, LAN or WAN networks via VoIP. Evolution 2G networks were built mainly for voice services and slow data transmission (defined in IMT-2000 specification documents), but are considered by the general public to be 2. 5G or 2. 75G services because they are several times slower than present-day 3G service. . 5G (GPRS) 2. 5G (â€Å"second and a half generation†) is used to describe 2G-systems that have implemented a packet-switched domain in addition to the circuit-switched domain. It does not necessarily provide faster services because bundling of timeslots is used for circuit-switched data services (HSCSD) as well. The first major step in the evolution of GSM networks to 3G occurred with the introdu ction of General Packet Radio Service (GPRS). CDMA2000 networks similarly evolved through the introduction of 1xRTT. The combination of these capabilities came to be known as 2. 5G. GPRS could provide data rates from 56 kbit/s up to 115 kbit/s. It can be used for services such as Wireless Application Protocol (WAP) access, Multimedia Messaging Service (MMS), and for Internet communication services such as email and World Wide Web access. GPRS data transfer is typically charged per megabyte of traffic transferred, while data communication via traditional circuit switching is billed per minute of connection time, independent of whether the user actually is utilizing the capacity or is in an idle state. 1xRTT supports bi-directional (up and downlink) peak data rates up to 153. kbit/s, delivering an average user data throughput of 80-100 kbit/s in commercial networks. It can also be used for WAP, SMS & MMS services, as well as Internet access. 2. 75G (EDGE) GPRS1 networks evolved to EDGE networks with the introduction of 8PSK encoding. Enhanced Data rates for GSM Evolution (EDGE), Enhanced GPRS (EGPRS), or IMT Single Carrier (IMT-SC) is a backward-compatible digital mobile phone technology that allows improved data transmission rates, as an extension on top of standard GSM. EDGE was deployed on GSM networks beginning in 2003—initially by Cingular (now AT&T) in the United States. EDGE is standardized by 3GPP as part of the GSM family and it is an upgrade that provides a potential three-fold increase in capacity of GSM/GPRS networks. Duplex A duplex communication system is a point-to-point system composed of two connected parties or devices that can communicate with one another in both directions. An example of a duplex device is a telephone. The people at both ends of a telephone call can speak at the same time, the earphone can reproduce the speech of the other person as the microphone transmits the speech of the local person, because there is a two-way communication channel between them. Duplex systems are employed in many communications networks, either to allow for a communication â€Å"two-way street† between two connected parties or to provide a â€Å"reverse path† for the monitoring and remote adjustment of equipment in the field. Systems that do not need the duplex capability use instead simplex communication in which one device transmits and the others just â€Å"listen. † Examples are broadcast radio and television, garage door openers, baby monitors, wireless microphones, radio controlled models, surveillance cameras, and missile telemetry.