Communism And Capitalism Are Two Radically Different Forms Of Governme

Communism and capitalism are two radically different forms of government which both aim to provide the best life for the citizens under its control. An important characteristic of communism is its aim to make sure that every citizen plays an equal role and gets an equal share of the community's profit. Under capitalism, all citizens are given the opportunity to succeed, but individual motivation and skill is required. Since money is one of the most essential measurements of success and stability, the two forms of government have their own planned approaches to dealing with employment, trade, and spread of wealth. Communism is a form of socialism or Marxism, first proposed by Karl Marx in the mid-19th century. In the Communist planned economy, the government determines what is to be produced and regulates prices and trade. The citizens follow the government's plans and play an equal part in producing the goods. The goods are distributed amongst the workers so that everyone gets an equal share. In theory, everyone is contributing an equal part and receives an equal share of the produce, and therefore class differences are eliminated. Everyone, no matter how big or small the role, is ensured to have enough food and other necessities to live. Communism must therefore run on the principal of sacrifice and cooperation, trusting that each person will do his or her job to help the entire community. Historically, however, there have been many failed attempts at creating a stable communist government. In 1931, Joseph Stalin attempted to catch up to Western Europe, which he felt was a century ahead of his Soviet Union. Also, communism allowed Stalin to avoid relations with neighboring nations, whom he had just fought in WWI, by keeping his country self-sufficient. His first approach was to convert the small farms to state-run agricultural facilities, in order to provide enough food for the entire nation. To do so he had to go against the peasant class which ran these farms. Although he managed to move most of the peasants to collective farms, many destroyed their agriculture in protest, and millions of citizens starved. For his country's industry, Stalin set up what was known as the "Five Year Plan". A board would set up a target goal for each company, now all state-owned, and the company would have to meet that target in production within five years. Failed attempts to do so coul d result in imprisonment in work camps or even execution. Quickly, care for quality products diminished, and production rose by thousands of percents. So much attention was being paid to improving the nation's industry that necessary items were being under-produced. While average income rose, and the Soviet Union found itself quickly catching up in European industry, we still see today the great poverty that communism often brings to its citizens. Poverty is one of the greatest downfalls of failed communism. While ideally, all the citizens are working together and sharing equal wealth, in actuality the deindividualization that the government enforces destroys work ethic and motivation. The results are low morale, unproductive workers, and low quality goods. Citizens of a communist nation see no personal gratification in working for the community, as their hard work yields the same rewards as a neighbor's laziness. This apathetic attitude often spirals into a failed economy. Capitalism is seen as the opposite of statist governments, including communism. It runs on personal achievement and gratification. Workers strive to succeed and produce quality products because they know that in return they will often reach financial success. In capitalist societies like America, there is a promise that hard work will bring even the poorest family to the top class. Indeed, dedication and skill is the most straight path to riches, and this incentive keeps the wheels of the country's economy running. In a capitalist free market, industries and privately owned, allowing for competition and a higher quality product. In laissez-faire capitalism, another name for the system, the government has virtually no impact on the economy, save for a few wage laws to ensure some amount of financial security for under skilled workers. While we run parallel to some capitalist ideas, America is not a true capitalism. We have some programs that are considered socialist, a

Free Essays on Old Man And The Sea

In Ernest Hemingway’s The Old Man and the Sea, Santiago, during his lonely journey out to sea, learned that life offered him an undeniable joy plus frustration. Honor, heroism, and struggle were obstacles Santiago encountered which provided him courage and faith. For instance, Santiago’s life was filled with honor. The past and the present were memories about which the old man was most proud. The old man endured tremendous physical pain, like the cramping in his hands, leading him to almost give up. To encourage himself, the old man remembered the time when he was â€Å"el campeon† meaning â€Å"the champion† in Spanish. For a long time after that everyone had called him â€Å"the champion† (Pg. 70). The memory of being a victor revived Santiago’s stamina, encouraging him to seek another goal. His next goal, the marlin, ultimately challenged him. He fought the fish for so long that he formed a type of bond with the fish, and he said â€Å"Fish, I will stay with you until I am dead† (Pg. 52). At the moment, when Santiago harpooned the marlin through the heart, he knew that he was victorious. This act realistically sobered Santiago; he gained more honor and self-confidence. As a result, Santiagoâ €™s life was filled with a feeling of nobility. Furthermore, Santiago often talked about his hero, Joe DiMaggio, a famous and eminent baseball player. Joe DiMaggio directly and indirectly affected the old man. His actions, like when he played baseball with the bone spur, and his attitudes contributed to the old man’s life. Thinking about DiMaggio showed the old man the way to victory. His worship of DiMaggio woke the courage that was within the old man’s heart. As Santiago thought the ultimate challenge was over, the worst was yet to come. The mako sharks had sensed the marlin’s blood in the water and moved after it. It approached and attacked the marlin. Santiago killed the first shark. After that, the sharks kept coming. Th... Free Essays on Old Man And The Sea Free Essays on Old Man And The Sea In Ernest Hemingway’s The Old Man and the Sea, Santiago, during his lonely journey out to sea, learned that life offered him an undeniable joy plus frustration. Honor, heroism, and struggle were obstacles Santiago encountered which provided him courage and faith. For instance, Santiago’s life was filled with honor. The past and the present were memories about which the old man was most proud. The old man endured tremendous physical pain, like the cramping in his hands, leading him to almost give up. To encourage himself, the old man remembered the time when he was â€Å"el campeon† meaning â€Å"the champion† in Spanish. For a long time after that everyone had called him â€Å"the champion† (Pg. 70). The memory of being a victor revived Santiago’s stamina, encouraging him to seek another goal. His next goal, the marlin, ultimately challenged him. He fought the fish for so long that he formed a type of bond with the fish, and he said â€Å"Fish, I will stay with you until I am dead† (Pg. 52). At the moment, when Santiago harpooned the marlin through the heart, he knew that he was victorious. This act realistically sobered Santiago; he gained more honor and self-confidence. As a result, Santiagoâ €™s life was filled with a feeling of nobility. Furthermore, Santiago often talked about his hero, Joe DiMaggio, a famous and eminent baseball player. Joe DiMaggio directly and indirectly affected the old man. His actions, like when he played baseball with the bone spur, and his attitudes contributed to the old man’s life. Thinking about DiMaggio showed the old man the way to victory. His worship of DiMaggio woke the courage that was within the old man’s heart. As Santiago thought the ultimate challenge was over, the worst was yet to come. The mako sharks had sensed the marlin’s blood in the water and moved after it. It approached and attacked the marlin. Santiago killed the first shark. After that, the sharks kept coming. Th... Free Essays on Old Man And The Sea In the books that we have read this semester there are two books that I chose to write about the first being The Old Man and the Sea and the second being The Crucible. The reason I chose these two books is because I feel that if there are driving forces inside of every person that make a person do bad things there also should be something inside of all of us to make us do good. I think that these two books illustrate that there are in fact both kinds of these driving forces. In some cases both of these forces are present and in others there is only one present. The Crucible was set in a very strange time when people were looking for religious freedom. These same people who wanted to be left alone to profess their religion moved to the present day Massachusetts where they tried to push their religion onto those who already lived there. Already you can see the contradiction, these people wished to be free and when they got their wish they wanted to force their beliefs upon others. The overall theme of this book was that almost everyone was out to protect themselves, these people would blame others, accuse them of witchery in order to keep from being accused themselves. The people of Salem would do whatever was necessary in order to keep a clear name. The majority of them were perfect examples of how the driving force inside of some can make even good people do bad things. On the other hand a great example of a strong person who knew right from wrong was John Proctor. He did not want to take part in the transfer of guilt and this proves that at least in some cases these driving forces are used for a good cause. The second book is quite different in that there are no accusations being made all the time and there are not really decisions to be made over right and wrong. The old man, Santiago, a fisherman who was having bad luck had gone forty days before the boy’s parents forbade him to fish with the old man. The fact th...

Can event management education in the UK successfully prepare for Literature review

Can event management education in the UK successfully prepare for industry professionals of the future - Literature review Example . Types of event management: McDonnell I (1999) says that in order to be successful in the field of event management, no matter what department of specialization one needs certain qualities which are as follows: Negotiating skills. Creative skills. Convincing skills. Coordinating skills. Planning skills. Executing and implementing skills. According to Royal C (1998) there is a list of the varied events that are organized by the cross section of event companies: Business events, Corporate events. Cause related events, Coordinating skills, Fundraising events, Exhibitions, Trade fairs, The Structure of the events industry: Foley P (1996) says that the rapid growth of events in the past decade led to the formation of an identifiable event industry with its own practitioners, suppliers and professional associations. The emergence of the industry has involved the identification and refinement of a discrete body of knowledge of the industry’s best practice accompanied by a period of rapid globalization of markets and communication which has affected the nature of and trends within the industry. Further it has been accompanied by an era of increasing government regulation, which has resulted in a complex and demanding operational environment. The following section describes the key components of the event industry. Begrudge G (2006) says that the events are often staged or hosted by event organizations which may be event specific bodies such as the Harrogate International Festival or the Glastonbury Festival of Contemporary Performing Arts. Other events are run by special teams within larger organizations such as BBC Good Food Show organized by BBC Haymarket Exhibitions or ITMA 2003 which was organized by a team within the NEC Group. Corporate Events are often organized by in-house event teams or by project teams within the companies that are putting on the event. Event management education and Training: According to Walters P (2008) as the size and the needs of the event industry have grown event management training has started to emerge as a discrete discipline. In the early years of the industry the field was characterized by a large number of volunteers. Those event managers who obtained paid positions came from a variety of related disciplines, drawing on their knowledge gained form that discipline and skills learnt on the job. As industry has grown a lot and government is allocating funds for event management industry, this leads a high demand of professional and educated event managers. Event management seems to be an easy job but without having a professional degree, sometimes it becomes really tough to defend the situation. Students have great opportunities after achieving event management degree. Client comes in a company with raw ideas, only a professional event manager can understand their ideas correctly. There is a process that needs to be followed by event managers for confirming the requirements of the client. Students achi eving degree of event management has great opportunities in market as event management is becoming a bright career for them. Now it becomes possible by the event managers to change client dream in reality about their events i.e. concert,

Take a position...Are Animals Conscious Essay Example | Topics and Well Written Essays - 1250 words

Take a position...Are Animals Conscious - Essay Example Inanimate things and organisms such as plants have limited capability to demonstrate such control of actions since the absence of a brain in their makeup eliminates chance for knowingness. It is a difficult affair to demonstrate the various levels or consciousness as possessed by various animals since the emergence of the debate on whether there is consciousness in animals. However, it is agreeable across both sides of the debate that consciousness exists in human beings. Debate therefore appears to revolve around the issue on whether consciousness exists in animals, and up to which level of organism organization. Debate has since emerged about the possibility of animals possessing consciousness as would elevate them to the same status with human beings (Schà ¶nfeld, 1). This discourse addresses the standoff on paradigms, aware of the fact that earlier versions support consciousness in human beings alone while emergent thoughts support existence of consciousness in animals as well. The first section explores older schools of thought that restrict possession of consciousness in humans while the second section explores the paradigm shift occasioning the inclusion of animals among those creatures possessing consciousness. A personal reflection is contained in the ending of the discourse, giving a position on the debate. Making an account of animal consci ousness debate, it is clear that current thinking about animal consciousness is a mess as Dennett brands it. A comparison of the old and the new paradigms and scientific propositions on the consciousness debate affirms the view that there has been a generally perception that animals are not like human beings regarding several aspects. Among the aspects that seemingly existed without much questioning and doubt is the issue of animal consciousness. As it appears, Schà ¶nfeld holds the opinion that the there was a feeling that it was not scientifically indulge research into

Gangs and the Music industry Essay Example | Topics and Well Written Essays - 1250 words

Gangs and the Music industry - Essay Example Today’s youths are like sponges soaking anything up which is given to them. The music industry has the greatest impact to today’s youth which gives it the most influential power, but sad to say the message being put out is not uplifting or promoting growth so that young people can better themselves. Instead, it puts out a message that it is okay to have multiple sex partners, to be part of a gang, and even use drugs every now and then. Music for a long time has been used to relay messages regarding sex and it is important to note that with time the sexual content and extent of explicitness has been getting worse decade after another. In the early to mid 20th century and before, music was quite conservative and sexual contents were rather to be deduced rather than explicitly expressed as the case is today. Today’s music is apparently changing the fundamental nature of sex to something that is causal and a form of expressing someone’s freedom rather than something with commitment for a relationship that is monogamous by nature. Today’s music and in this case rap and hip hop is bringing to the fore the idea that society is now liberal and all are free to act as they please. This kind of music has lyrics as well as videos that are clearly showing sex as an act of freedom and maturity. Martino, et al. (2006) says that there is increasing explicit use of sex on the songs’ lyrics and their mus ic videos as an expression of pleasure, empowerment, and freedom. The youth with their peer pressure attitudes take these messages as literally as possible ending up having sexual relations quite early in their life. â€Å"Fifty-one percent of teens who listened to music laced with sexual debauchery ended up engaging in sexual activity, compared to just 29 percent of those who listened to little or none of the same types of music† (Wallace, 2010, p. 2). A study reveals that 15% of music videos illustrate or feature violent

Operation Of TWT And Magnetrons

Operation Of TWT And Magnetrons A traveling-wave tube (TWT) is an electronic device used to amplify radio frequency signals to high power, usually in an electronic assembly known as a traveling-wave tube amplifier (TWTA). The bandwidth of a broadband TWT can be as high as three octaves, although tuned (narrowband) versions exist, and operating frequencies range from 300Â  MHz to 50Â  GHz. The voltage gain of the tube can be of the order of 70 decibels. Traveling-Wave Tubes Traveling-wave tubes (TWTs) are high-gain, low- noise, wide and width microwave amplifiers, capable of gains of 40 dB or more, with bandwidths of over an octave. (A bandwidth of 1 octave is one in which the upper frequency is twice the lower frequency.) TWTs have been designed for frequencies as low as 300 MHz and as high as 50 GHz. The primary use for TWTs is voltage amplification (although high-power TWTs, with characteristics similar to those of a power klystron, have been developed). Their wide bandwidth and low-noise characteristics make them ideal for use as RF amplifiers. CONSTRUCTION: The device is an elongated vacuum tube with an electron gun (a heated cathode that emits electrons) at one end. A magnetic containment field around the tube focuses the electrons into a beam, which then passes down the middle of a wire helix that stretches from the RF input to the RF output, the electron beam finally striking a collector at the other end. A directional coupler, which can be either a waveguide or an electromagnetic coil, fed with the low-powered radio signal that is to be amplified, is positioned near the emitter, and induces a current into the helix. The helix acts as a delay line, in which the RF signal travels at near the same speed along the tube as the electron beam. The electromagnetic field due to the RF signal in the helix interacts with the electron beam, causing bunching of the electrons (an effect called velocity modulation), and the electromagnetic field due to the beam current then induces more current back into the helix (i.e. the current builds up and thus is amplified as it passes down). A second directional coupler, positioned near the collector, receives an amplified version of the input signal from the far end of the helix. An attenuator placed on the helix, usually between the input and output helicies, prevents reflected wave from travelling back to the cathode. Higher powered TWTs usually contain beryllium oxide ceramic as both a helix support rod and in some cases, as an electron collector for the TWT because of its special electrical, mechanical, and thermal properties. OPERATION AND WORKING While the electron beam in a klystron travels primarily in regions free of RF electric fields, the beam in a TWT is continually inter- acting with an RF electric field propagating along an external circuit surrounding the beam. To obtain amplification, the TWT must propagate a wave whose phase velocity is nearly synchronous with the dc velocity of the electron beam. It is difficult to accelerate the beam to greater than approximately one- fifth the velocity of light. Therefore, the forward velocity of the RF field propagating along the helix must be reduced to nearly that of the beam. The phase velocity in a waveguide, which is uniform in the direction of propagation, is always greater than the velocity of light. However, this velocity can be reduced below the velocity of light by introducing a periodic variation of the circuit in the direction of propagation. The simplest form of variation is obtained by wrapping the circuit in the form of a helix, whose pitch is equal to the desire d slowing factor. TWT MIXER.- A TWT is also used as a micro- wave mixer. By virtue of its wide bandwidth, the TWT can accommodate the frequencies generated by the heterodyning process (provided that the frequencies have been chosen to be within the range of the tube). The desired frequency is selected by the use of a filter on the output of the helix. A TWT mixer has the added advantage of providing gain as well as simply acting as a mixer. TWT MODULATION.- A TWT can be modulated by applying the modulating signal to a modulator grid. The modulator grid can be used to turn the electron beam on and off, as in pulsed microwave applications, or to control the density of the beam and its ability to transfer energy to the traveling wave. Thus, the grid can be used to amplitude modulate the output. TWT OSCILLATOR.- A forward-wave TWT can be constructed to serve as a microwave oscillator. Physically, a TWT amplifier and an oscillator differ in two major ways. The helix of the oscillator is longer than that of the amplifier, and there is no input connection to the oscillator. TWT oscillators are often called backward-wave oscillators (BWOs) or carcintrons. The Traveling-Wave Tube The TRAVELING-WAVE TUBE (twt) is a high-gain, low-noise, wide-bandwidth microwave amplifier. It is capable of gains greater than 40 dB with bandwidths exceeding an octave. (A bandwidth of 1 octave is one in which the upper frequency is twice the lower frequency.) Traveling-wave tubes have been designed for frequencies as low as 300 megahertz and as high as 50 gigahertz. The twt is primarily a voltage amplifier. The wide-bandwidth and low-noise characteristics make the twt ideal for use as an RF amplifier in microwave equipment. The physical construction of a typical twt is shown in figure 2-13. Fig-2 The twt contains an electron gun which produces and then accelerates an electron beam along the axis of the tube. The surrounding magnet provides a magnetic field along the axis of the tube to focus the electrons into a tight beam. The HELIX, at the center of the tube, is a coiled wire that provides a low-impedance transmission line for the RF energy within the tube. The RF input and output are coupled onto and removed from the helix by directional couplers that have no physical connection to the helix. If the RF energy is transported on coaxial cables, the coaxial couplers are wound in a helical manner similar to that shown in figure 2. If the RF energy is transported in waveguides, waveguide directional couplers are used. The attenuator prevents any reflected waves from traveling back down the helix. Physical construction of a twt. A simplified version of twt operation is shown in fig below. In the figure, an electron beam is passing along a nonresonant transmission line represente d by a straight wire. The input to the transmission line is an RF wave which travels on the line from input to output. The line will transport a wide range of RF frequencies if it is terminated in the characteristic impedance of the line. The electromagnetic waves traveling down the line produce electric fields that interact with the electrons of the beam. Fig:-3 If the electrons of the beam were accelerated to travel faster than the waves traveling on the wire, bunching would occur through the effect of velocity modulation. Velocity modulation would be caused by the interaction between the traveling-wave fields and the electron beam. Bunching would cause the electrons to give up energy to the traveling wave if the fields were of the correct polarity to slow down the bunches. The energy from the bunches would increase the amplitude of the traveling wave in a progressive action that would take place all along the length of the twt, as shown in figure . However, because the waves travel along the wire at the speed of light, the simple twt shown in figure 3 will not work. At present no way is known to accelerate an electron beam to the speed of light. Since the electron beam cannot travel faster than the wave on the wire, bunching will not take place and the tube will not work. The twt is therefore designed with a delay structure to slow the tra veling wave down to or below the speed of the electrons in the beam. A common twt delay structure is a wire, wound in the form of a long coil or helix, as shown in figure , view (A). The shape of the helix slows the effective velocity of the wave along the common axis of the helix and the tube to about one-tenth the speed of light. The wave still travels down the helix wire at the speed of light, but the coiled shape causes the wave to travel a much greater total distance than the electron beam. The speed at which the wave travels down the tube can be varied by changing the number of turns or the diameter of the turns in the helix wire. The helical delay structure works well because it has the added advantage of causing a large proportion of electric fields that are parallel to the electron beam. The parallel fields provide maximum interaction between the fields and the electron beam. In a typical twt, the electron beam is directed down the center of the helix while, at the same time, an RF signal is coupled onto the helix. The electrons of the beam are velocity-modulated by the electric fields produced by the RF signal. Amplification begins as the electron bunches form and release energy to the signal on the helix. The slightly amplified signal causes a denser electron bunch which, in turn, amplifies the signal even more. The amplification process is continuous as the RF wave and the electron beam travel down the length of the tube. Any portion of the twt output signal that reflects back to the input will cause oscillations within the tube which results in a decrease in amplification. Attenuators are placed along the length of the helix to prevent reflections from reaching the input. The attenuator causes a loss in amplitude, as can be seen in figure , view (B), but it can be placed so as to minimize losses while still isolating the input from the output. The rel atively low efficiency of the twt partially offsets the advantages of high gain and wide bandwidth. The internal attenuator reduces the gain of the tube, and the power required to energize the focusing magnet is an operational loss that cannot be recovered. The twt also produces heat which must be dissipated by either air-conditioning or liquid-cooling systems. All of these factors reduce the overall efficiency of the twt, but the advantages of high gain and wide bandwidth are usually enough to overcome the disadvantages. THE MAGNETRON The MAGNETRON, shown in figure 4-A, is a self-contained microwave oscillator that operates differently from the linear-beam tubes, such as the twt and the klystron. Figure 4-B is a simplified drawing of the magnetron. CROSSED-ELECTRON and MAGNETIC fields are used in the magnetron to produce the high-power output required in radar and communications equipment. Figure 4.A.-Magnetron Figure4 b.-Magnetron The magnetron is classed as a diode because it has no grid. A magnetic field located in the space between the plate (anode) and the cathode serves as a grid. The plate of a magnetron does not have the same physical appearance as the plate of an ordinary electron tube. Since conventional inductive- capacitive (LC) networks become impractical at microwave frequencies, the plate is fabricated into a cylindrical copper block containing resonant cavities which serve as tuned circuits. The magnetron base differs considerably from the conventional tube base. The magnetron base is short in length and has large diameter leads that are carefully sealed into the tube and shielded. The cathode and filament are at the center of the tube and are supported by the filament leads. The filament leads are large and rigid enough to keep the cathode and filament structure fixed in position. The output lead is usually a probe or loop extending into one of the tuned cavities and coupled into a waveguide or coaxial line. The plate structure, shown in figure 5, is a solid block of copper. The cylindrical holes around its circumference are resonant cavities. A narrow slot runs from each cavity into the central portion of the tube dividing the inner structure into as many segments as there are cavities. Alternate segments are strapped together to put the cavities in parallel with regard to the output. The cavities control the output frequency. The straps are circular, metal bands that are placed across the top of the block at the entrance slots to the cavities. Since the cathode must operate at high power, it must be fairly large and must also be able to withstand high operating temperatures. It must also have good emission characteristics, particularly under return bombardment by the electrons. This is because most of the output power is provided by the large number of electrons that are emitted when high-velocity electrons return to strike the cathode. The cathode is indirectly heated and is constructed of a high- emission material. The open space between the plate and the cathode is called the INTERACTION SPACE. In this space the electric and magnetic fields interact to exert force upon the electrons. Figure 5.-Cutaway view of a magnetron The magnetic field is usually provided by a strong, permanent magnet mounted around the magnetron so that the magnetic field is parallel with the axis of the cathode. The cathode is mounted in the center of the interaction space. BASIC MAGNETRON OPERATION.-Magnetron theory of operation is based on the motion of electrons under the influence of combined electric and magnetic fields. The following information presents the laws governing this motion. The direction of an electric field is from the positive electrode to the negative electrode. The law governing the motion of an electron in an electric field (E field) states: The force exerted by an electric field on an electron is proportional to the strength of the field. Electrons tend to move from a point of negative potential toward a positive potential. This is shown in figure 6. In other words, electrons tend to move against the E field. When an electron is being accelerated by an E field, as shown in figure 6, energy is taken from the field by the electron. Figure 6.-Electron motion in an electric field The law of motion of an electron in a magnetic field (H field) states: The force exerted on an electron in a magnetic field is at right angles to both the field and the path of the electron. The direction of the force is such that the electron trajectories are clockwise when viewed in the direction of the magnetic field. This is shown in figure 7. Figure 7.-Electron motion in a magnetic field In figure 7, assume that a south pole is below the figure and a north pole is above the figure so that the magnetic field is going into the paper. When an electron is moving through space, a magnetic field builds around the electron just as it would around a wire when electrons are flowing through a wire. In figure 7 the magnetic field around the moving electron adds to the permanent magnetic field on the left side of the electrons path and subtracts from the permanent magnetic field on the right side. This action weakens the field on the right side; therefore, the electron path bends to the right (clockwise). If the strength of the magnetic field is increased, the path of the electron will have a sharper bend. Likewise, if the velocity of the electron increases, the field around it increases and the path will bend more sharply. A schematic diagram of a basic magnetron is shown in figure 8A. The tube consists of a cylindrical plate with a cathode placed along the center axis of the p late. The tuned circuit is made up of cavities in which oscillations take place and are physically located in the plate. When no magnetic field exists, heating the cathode results in a uniform and direct movement of the field from the cathode to the plate, as illustrated in figure 8B. However, as the magnetic field surrounding the tube is increased, a single electron is affected, as shown in figure 9. In figure 9, view (A), the magnetic field has been increased to a point where the electron proceeds to the plate in a curve rather than a direct path. Figure 8A.-Basic magnetron. SIDE VIEW Figure 9.-Effect of a magnetic field on a single electron In view (B) of figure 9, the magnetic field has reached a value great enough to cause the electron to just miss the plate and return to the filament in a circular orbit. This value is the CRITICAL VALUE of field strength. In view (C), the value of the field strength has been increased to a point beyond the critical value; the electron is made to travel to the cathode in a circular path of smaller diameter. View (D) of figure 9. shows how the magnetron plate current varies under the influence of the varying magnetic field. In view (A), the electron flow reaches the plate, so a large amount of plate current is flowing. However, when the critical field value is reached, as shown in view (B), the electrons are deflected away from the plate and the plate current then drops quickly to a very small value. When the field strength is made still greater, as shown in view (C), the plate current drops to zero. When the magnetron is adjusted to the cutoff, or critical value of the plate current, and the electrons just fail to reach the plate in their circular motion, it can produce oscillations at microwave frequencies. These oscillations are caused by the currents induced electrostatically by the moving electrons. The frequency is determined by the time it takes the electrons to travel from the cathode toward the plate and back again. A transfer of microwave energy to a load is made possible by connecting an external circuit between the cathode and the plate of the magnetron. Magnetron oscillators are divided into two classes: NEGATIVE-RESISTANCE and ELECTRON-RESONANCE MAGNETRON OSCILLATORS. A negative-resistance magnetron oscillator is operated by a static negative resistance between its electrodes. This oscillator has a frequency equal to the frequency of the tuned circuit connected to the tube. An electron-resonance magnetron oscillator is operated by the electron transit time required for electrons to travel from cathode to plate. This oscillator is capable of generati ng very large peak power outputs at frequencies in the thousands of megahertz. Although its average power output over a period of time is low, it can provide very high-powered oscillations in short bursts of pulses.

Comparing Malcolm X and Martin Luther King Essay -- essays research pa

Comparing Malcolm X and Martin Luther King During the twentieth century Black people faced a huge amount of discrimination from the whites and found it very difficult to achieve civil rights. They were at one stage deprived of voting, being entitled the same things as blacks and going to a white school. In order for blacks to achieve civil rights they really needed someone to follow, they needed a leader. Many black leaders did emerge for the fight for civil rights, such as, Malcolm X, James Baldwin, Martin Luther King, Marcus Garvey, some had some ways of thinking some had others. Two of the most powerful and influential leaders of the twentieth century were Malcolm X and Martin Luther King. These two leaders had different approaches, and different views towards white people, perhaps their different approaches of violence and non-violence stem from their original opinions of how capable the whites are of being "good", but fought for the same thing. Freedom. These great leaders came from vastly different backgrounds which is shown in their thinking on life, especially early on. Martin was a Christian from the rural south, whilst Malcolm had become a Muslim from the urban north. King called for love of your neighbor, integration and nonviolence, which was part of his American Dream. Malcolm X called for self-love, separation, and "by any means necessary", which was part of his Black Nationalism. Throughout their lives their views were constantly changing, largely affected by each other, but also by the many events in their lives. Malcolm X forced King to become more radical and to look into the problems of the urban north. King made X become more politically active and work much more with the Civil Rights Movement. Although many have often said that they were "like oil and water", these two men, however different they may have seemed to be, had the same goal. They wanted to end exploitation, discrimination and racism. Also, for both, reli gion was primary in defining their lives and ideals. There are two distinct phases in their political lives. For King, the change in his outlook came when he looked at the social problems of the urban slums, and the extent of racism of his previous allies. This turning point came with the riots in Watts, Los Angeles. For Malcolm X, the major change came when he broke from the Nation of Islam and went on his trip to Mec... ...ithin the white communities. This is important because it shows that it is possible for whites and blacks to work together for a single cause. It leaves hope that maybe one day, all traces of racism can disappear and leave behind a united society in which everyone can work together for the good of the country. So overall Martin Luther King was much more educated then Malcolm X. He had seen life the easy way compared to Malcolm. Martin Luther King hadn’t been through what Malcolm had been through, while Malcolm x was busy being a criminal, Martin Luther King was busy doing his Ph.D. Malcolm X spent about ten years of his life in jail, which in that time he learned to hate the white man, his belief towards whites was they were ‘blue-eyed devils’. I think towards the end King became more radical because he became more critical of the government, mainly because King had seen laws being passed and civil rights being achieved politically but still socially he felt that black people hadn’t achieved civil rights. The case for Malcolm X is not however the same, while his journey to Mecca Malcolm finds out there are white Muslims, therefor discover that not all white people are devils.