Gun control College Essay Example | Topics and Well Written Essays - 750 words

Gun control College - Essay Example The assassinations of President John F. Kennedy, Martin Luther King and etc in the year 1960 develop issues related to gun control and the element of guns and arms become a subject of passion and controversy (Roleff, 2007). Different people have different opinions about the issue of gun control and many individuals consider it as a criminal issue however different people consider as a right issue. Responsible citizens can manage this issue but if it is not managed properly then it can create numerous problems for than individual and for the society Different laws regarding to arms and ammunition has been initiated by the government since 1934 and these laws and regulations are for the firearms and their ammunition. The biggest advantage of gun control is that it curbs the access of arms by criminals, juveniles and other high risk individuals. Individuals believe that federal measures are the most important element of reducing the availability of guns and it can easily stop crimes. Similarly, the registration of guns and the registrations of arm dealers can reduce the element of violence in our society (Roleff, 2007). This won't incur any social costs and no constitutional barriers are present. However, certain opponents of the gun control believed that federal policies keep the arms out of the hands of high risks persons but they create burdens for law-abiding citizens (Almanac of Policy Issues, 2009). There are two major federal statutes that are related to gun control. These two acts are National Firearms Act of 1934 and the Gun Control Act of 1968. A transfer tax was imposed on machine guns and short-barreled guns in the Act of 1934. However, the Act of 1968 prohibits mail order sales and interstate sales of guns and arms. Similarly, sales to minors and certain penalties and licensing requirements for manufacturers, dealers and importers were imposed. However, on June, 2008 made a landmark ruling regarding arms and the Supreme Court upholds the right of individuals to bear arms for hunting and for the purpose of self defense (Awesome Library, 2009). Certain statistics and figures are used in the gun control debate and statisticians suggest that the numbers of homicides with firearm persons are increasing and the figure has risen to 173%. However, from 1985 to 1993 the figure decreased by 47% and in the year 1999 this figure decreased to 22%. The advocates of gun control argue on the point that the availability of guns to injury and mortality rates comes from the study of domestic violence. The advocates of firearms believe that because homeowners possess a risk of home invasion that is the reason why they acquire arms and these guns and arms are for their security. However, researcher analyzed that he risk of a homicide is higher in these homes because individuals have easy access to guns and no one is present to stop them. A number of individuals believe that sensible gun control in beneficial for the society and all the guns and owners of these guns should be registered. The Bullets of these guns should have serial numbers so that in becomes quite easy to trace a crime. Proper registration process must be incorporated and the gun

Ac Synchronous Machine And Its Application Engineering Essay

Ac Synchronous Machine And Its Application Engineering Essay Synchronous machines are principally used as alternating current (AC) generators. They supply the electric power used by all sectors of modern societies: industrial, commercial, agricultural, and domestic. Synchronous machines are sometimes used as constant-speed motors, or as compensators for reactive power control in large power systems. This article explains the constructional features and operating principles of the synchronous machine. Generator performance for stand-alone and grid applications is discussed. The effects of load and field excitation on the synchronous motor are investigated. The hunting behavior of a synchronous machine is studied, and a review of various excitation systems provided. INTRODUCTION: Synchronous motor A synchronous electric motor is an AC motor distinguished by a rotor spinning with coils passing magnets at the same rate as the alternating current and resulting rotating magnetic field which drives it. Another way of saying this is that it has zero slip under usual operating conditions. Contrast this with an induction motor, which must slip in order to produce torque. They operate synchronously with line frequency. As with squirrel-cage induction motors, speed is determined by the number of pairs of poles and the line frequency. Synchronous motors are available in sub-fractional self-excited sizes to high-horsepower direct-current excited industrial sizes. In the fractional horsepower range, most synchronous motors are used where precise constant speed is required. In high-horsepower industrial sizes, the synchronous motor provides two important functions. First, it is a highly efficient means of converting ac energy to work. Second, it can operate at leading or unity power factor and thereby provide power-factor correction. There are two major types of synchronous motors: non-excited and direct-current excited. Non-excited motors are manufactured in reluctance and hysteresis designs, these motors employ a self-starting circuit and require no external excitation supply. Reluctance designs have ratings that range from sub-fractional to about 30  hp. Sub-fractional horsepower motors have low torque, and are generally used for instrumentation applications. Moderate torque, integral horsepower motors use squirrel- cage construction with toothed rotors. When used with an adjustable frequency power supply, all motors in the drive system can be controlled at exactly the same speed. The power supply frequency determines motor operating speed. Hysteresis motors are manufactured in sub-fractional horsepower ratings, primarily as servomotors and timing motors. More expensive than the reluctance type, hysteresis motors are used where precise constant speed is required. D C-excited motors made in sizes larger than 1  hp, these motors require direct current supplied through slip rings for excitation. The direct current can be supplied from a separate source or from a dc generator directly connected to the motor shaft. Slip rings and brushes are used to conduct current to the rotor. The rotor poles connect to each other and move at the same speed hence the name synchronous motor. Synchronous motors fall under the category of synchronous machines which also includes the alternator (synchronous generator). These machines are commonly used in analog electric clocks, timers and other devices where correct time is required. The speed of a synchronous motor is determined by the following formula: where v is the speed of the rotor (in rpm), f is the frequency of the AC supply (in Hz) and n is the number of magnetic poles. Figure: Two pole Two pole: P.T.O Main features of synchronous machine: A synchronous machine is an ac machine whose speed under steady-state conditions is proportional to the frequency of the current in its armature. Armature winding: on the stator, alternating current. Field winding: on the rotor, dc power supplied to built a rotating magnetic field. Cylindrical rotor: for two- and four-pole turbine generators. Salient-pole rotor: for multi-polar, slow-speed, hydroelectric generators and for most synchronous motors. The rotor, along with the magnetic field created by the dc field current on the rotor, rotates at the same speed as, or in  synchronism with, the rotating magnetic field produced by the armature currents, and a steady torque results. Synchronous motors have the following characteristics: A three-phase stator similar to that of an induction motor. Medium voltage stators are often used. A wound rotor (rotating field) which has the same number of poles as the stator, and is supplied by an external source of direct current (DC). Both brush-type and brushless exciters are used to supply the DC field current to the rotor. The rotor current establishes a north/south magnetic pole relationship in the rotor poles enabling the rotor to lock-in-step with the rotating stator flux. Starts as an induction motor. The synchronous motor rotor also has a squirrel-cage winding, known as an Amortisseur winding, which produces torque for motor starting. Synchronous motors will run at synchronous speed in accordance with the formula: 120 x Frequency Synchronous RPM = Number of Poles Example: the speed of a 24 -Pole Synchronous Motor operating at 60 Hz would be: 120 x 60 / 24 = 7200 / 24 = 300 RPM Synchronous Motor Operation: The squirrel-cage Amortisseur winding in the rotor produces Starting Torque and Accelerating Torque to bring the synchronous motor up to speed. When the motor speed reaches approximately 97% of nameplate RPM, the DC field current is applied to the rotor producing Pull-in Torque and the rotor will pull-in -step and synchronize with the rotating flux field in the stator. The motor will run at synchronous speed and produce Synchronous Torque. After synchronization, the Pull-out Torque cannot be exceeded or the motor will pull out-of-step. Occasionally, if the overload is momentary, the motor will slip-a-pole and resynchronize. Pull-out protection must be provided otherwise the motor will run as an induction motor drawing high current with the possibility of severe motor damage. Advantages of Synchronous Motors: The initial cost of a synchronous motor is more than that of a conventional AC induction motor due to the expense of the wound rotor and synchronizing circuitry. These initial costs are often off-set by: Precise speed regulation makes the synchronous motor an ideal choice for certain industrial processes and as a prime mover for generators. Synchronous motors have speed / torque characteristics which are ideally suited for direct drive of large horsepower, low-rpm loads such as reciprocating compressors. Synchronous motors operate at an improved power factor, thereby improving overall system power factor and eliminating or reducing utility power factor penalties. An improved power factor also reduces the system voltage drop and the voltage drop at the motor terminals. Synchronous generator: Speed of rotation of synchronous generator: Electric power generated at 50 or 60 Hz, so rotor must turn at fixed speed depending on number of poles on machine To generate 60 Hz in 2 pole machine, rotor must turn at 3600 r/min, and to generate 50 Hz in 4 pole machine, rotor must turn at 1500 r/min Internal generated voltage of ac generated machine. magnitude of induced voltage in one phase determined in last section: EA=à ¢Ã‹â€ Ã… ¡2 à Ã¢â€š ¬ NC à Ã¢â‚¬   f Parts of ac synchronous machine: A synchronous motor is composed of the following parts: The stator is the outer shell of the motor, which carries the armature winding. This winding is spatially distributed for poly-phase AC current. This armature creates a rotating magnetic field inside the motor. The rotor is the rotating portion of the motor. it carries field winding, which may be supplied by a DC source. On excitation, this field winding behaves as a permanent magnet. The slip rings in the rotor, to supply the DC to the field winding, in the case of DC excited types. Operation: The operation of a synchronous motor is simple to imagine. The armature winding, when excited by a poly-phase (usually 3-phase) winding, creates a rotating magnetic field inside the motor. The field winding, which acts as a permanent magnet, simply locks in with the rotating magnetic field and rotates along with it. During operation, as the field locks in with the rotating magnetic field, the motor is said to be in synchronization. Once the motor is in operation, the speed of the motor is dependent only on the supply frequency. When the motor load is increased beyond the break down load, the motor falls out of synchronization i.e., the applied load is large enough to pull out the field winding from following the rotating magnetic field. The motor immediately stalls after it falls out of synchronization. Starting method of synchronous motor: Synchronous motors are not self-starting motors. This property is due to the inertia of the rotor. When the power supply is switched on, the armature winding and field windings are excited. Instantaneously, the armature winding creates a rotating magnetic field, which revolves at the designated motor speed. The rotor, due to inertia, will not follow the revolving magnetic field. In practice, the rotor should be rotated by some other means near to the motors synchronous speed to overcome the inertia. Once the rotor nears the synchronous speed, the field winding is excited, and the motor pulls into synchronization. The following techniques are employed to start a synchronous motor: A separate motor (called pony motor) is used to drive the rotor before it locks in into synchronization. The field winding is shunted or induction motor like arrangements are made so that the synchronous motor starts as an induction motor and locks in to synchronization once it reaches speeds near its synchronous speed. Reducing the input electrical frequency to get the motor starting slowly, Variable-frequency drives can be used here which have Rectifier-Inverter circuits or Cycloconverter circuits. Special Properties: Synchronous motors show some interesting properties, which finds applications in power factor correction. The synchronous motor can be run at lagging, unity or leading power factor. The control is with the field excitation, as described below: When the field excitation voltage is decreased, the motor runs in lagging power factor. The power factor by which the motor lags varies directly with the drop in excitation voltage. This condition is called under-excitation. When the field excitation voltage is made equal to the rated voltage, the motor runs at unity power factor. When the field excitation voltage is increased above the rated voltage, the motor runs at leading power factor. And the power factor by which the motor leads varies directly with the increase in field excitation voltage. This condition is called over-excitation. The most basic property of synchro motor is that it can be use both as a capacitor or inductor. Hence in turn it improves the power factor of system. The leading power factor operation of synchronous motor finds application in power factor correction. Normally, all the loads connected to the power supply grid run in lagging power factor, which increases reactive power consumption in the grid, thus contributing to additional losses. In such cases, a synchronous motor with no load is connected to the grid and is run over-excited, so that the leading power factor created by synchronous motor compensates the existing lagging power factor in the grid and the overall power factor is brought close to 1 (unity power factor). If unity power factor is maintained in a grid, reactive power losses diminish to zero, increasing the efficiency of the grid. This operation of synchronous motor in over-excited mode to correct the power factor is sometimes called as Synchronous condenser. Uses: Synchronous motors find applications in all industrial applications where constant speed is necessary. Improving the power factor as Synchronous condensers. Electrical power plants almost always use synchronous generators because it is important to keep the frequency constant at which the generator is connected. Low power applications include positioning machines, where high precision is required, and robot actuators. Mains synchronous motors are used for electric clocks. Record player turntables. Advantages: Synchronous motors have the following advantages over non-synchronous motors: Speed is independent of the load, provided an adequate field current is applied. Accurate control in speed and position using open loop controls, e.g. stepper motors. They will hold their position when a DC current is applied to both the stator and the rotor windings. Their power factor can be adjusted to unity by using a proper field current relative to the load. Also, a capacitive power factor, (current phase leads voltage phase), can be obtained by increasing this current slightly, which can help achieve a better power factor correction for the whole installation. Their construction allows for increased electrical efficiency when a low speed is required (as in ball mills and similar apparatus). They run either at the synchronous speed else no speed is there. Conclusion: With the help of the above paper now we can understand ac synchronous machine, its working, method, uses, advantages, disadvantages, application etc. We can also explain what kind of further enhancements are going to be, on the field of ac synchronous machine. Although important information is been provided about ac synchronous motors, ac synchronous generator etc. And even on the combination of both of them.

Carol Ann Duffys Revision of Masculinist Representations of Female Ide

Carol Ann Duffy's Revision of Masculinist Representations of Female Identity Carol Ann Duffy is one of the freshest and bravest talents to emerge in British poetry —any poetry — for years', writes Eavan Boland (Duffy, 1994, cover). This courage is manifest in Duffy’s ability and desire to revise masculinist representations of female identity and her engagement with feminine discourse, a concept which, as Sara Mills points out: has moved away from viewing women as simply an oppressed group, as victims of male domination, and has tried to formulate ways of analysing power as it manifests itself and as it is resisted in the relations of everyday life. (p.78) It is these aspects of Duffy's work that I wish to address here by examining the ways in which she subverts masculinist assumptions and discourses in the following ways: by giving voice to previously marginalised or silenced figures, by re-presenting stereotypes and power relations, through comic reappropriation of myth and by re-writing the canonical love poem. The problematic nature of representation itself, its subjectivity and unreliability, is a central concern of Duffy's poetry. Much of her work is written in the form of dramatic monologue which serves to demonstrate the fundamental inadequacy of language to re-present by undermining the readers' expectations of traditional discourses. By using characters' voices rather than her own, Duffy identifies with the speaker and confers authority onto a voice which might otherwise be silent. The foregrounding of this voice becomes a means of demonstrating the failure of language to represent specific aspects of experience, particularly female experience. The monologue, by giving voice to the previously subjugated female ... ...t, New York. Works Cited Duffy, Carol Ann, Standing Female Nude (London: Anvil, 1985). ——, Selling Manhattan (London: Anvil, 1987). ——, The Other Country (London: Anvil, 1990). ——, Selected Poems (London: Penguin, 1994). ——, The World’s Wife (London: Picador, 1999). Gregson, Ian, 'Carol Ann Duffy: Monologue as Dialogue' in Contemporary Poetry and Postmodernism: Dialogue and Estrangement (Basingstoke: MacMillan, 1996). Lacan, Jacques, 'The Insistence of the Letter in the Unconscious' in David Lodge, (ed.), Modern Criticism and Theory: A Reader (London: Longman, 1988). Mills, Sara, Discourse (London: Routledge, 1997). ‘Pass Notes’, Guardian G2, 10 May 1999, p.3. Room, Adrian, (ed.), Brewer's Dictionary of Phrase and Fable (London: Cassel & Co, 2001). Viner, Katharine, 'Metre Maid', Guardian Weekend, 25 September 1999, pp.20‑26.

Shame by Dick Greogry

Trey Swearingen ENG 100 Instructor: Charley Duvaal March 7, 2013 word count: 1643 Psychological Effects of Poverty The psychological effects of poverty on children are embarrassment and public humiliations of dealing with poverty. Imagine going to school without breakfast, much sleep and clothes that may still be wet from the night before since they didn’t dry due to a lack of appropriate appliances.Many people face these hardships everyday and they learn to cope with them in the best way they can. In the short story â€Å"Shame† by Dick Gregory, he writes about him life and how he went through those same things as a kid growing up in poverty. He clearly shows that poverty brings much privation as well as a great deal of shame. However, there are still ways to gain pride and happiness. This story shows that by emulating somebody you respect, even a very poor person can derive pride from small actions, which the average person sees as insignificant. Related essay: Shame is Worth a TryThey have to deal with being put in a stereotype for â€Å"poor† or â€Å"lower income† people. The psychological effects of poverty on children are the lowering of self-esteem, being isolated, and becoming determined. So what is it exactly that creates a rift between children from low income homes and those living above the poverty line? For one, these children lack the stability that comes with a higher income home. This means not having the things that other children have, from adequate nutrition to weather appropriate clothing.In addition, less income generally means there are fewer opportunities for activities and learning experiences. Gregory tells of his shame of living in poverty, and having only one set of clothes and a jacket that welfare gave to all the poor children. Gregory writes, â€Å"There was shame in wearing the brown and orange and white plaid mackinaw the welfare gave to 3,000 boys. Why did it have to be the same for everybody so when you walked down the street the people could see you were on relief? † (194). He is expressing how inadequate he felt compared to children from higher means.He saw that they were able to afford nicer things. Children face monumental hardships in our country because of poverty or the condition of not possessing the means to afford basic human needs. Children are under a lot of pressure in today’s society to excel in everything they do: from school to sports. Being a child in poverty adds even more stress that can ultimately be detrimental to a child. Poverty causes a rift in children who live above the poverty line and those below the poverty line. In general, children from homes living under the poverty line have poorer performance in school.Emotional development is lower in poverty children than those children who live in homes whose income is above the poverty line. In the short story, â€Å"Shame†, Richard is a poor boy without a father, l iving in the ghetto. However, there is a girl at school named Helene that he is in love with. Unlike Richard, Helene is well off, wears clean clothes, and is very smart in school. Richard tries very hard to be like Helene. He melts the ice water from the grocery store so he should be able to wash his clothes for the next day of school. The only reason he goes to school is for her. Everyone else condemns his behavior.Nobody understands that the reason why he does not function like everyone else was because when he gets up in the morning he does not have breakfast. Nobody realizes that he is just another boy who wants to be recognized and seen as just a normal kid like everyone else. They do not comprehend how hard he is trying to accomplish that. While everybody else is having fun after school, he is shining shoes just to get a little change so he could get by. When the day comes that the kids pledge their fathers' money to the Community Chest, naturally Richard wants to match Helene 's pledge.However, when Richard gets up to match Helene's amount, the teacher becomes upset at Richard. She said, firstly, that the money is for â€Å"him and his kind,† and therefore, if he is able to give, he has no reason to be receiving relief. Secondly, she said that he did not even have a daddy. The story shows many different aspects in which poor people suffer, and also things that they may derive pride from that we do not understand. It also shows that the emotions that they show and actions that they do, regardless of how weird or unimportant they seem, may provide great relief and happiness to a poor person.Growing up in poverty can take a toll on anyone; not having money can affect the biggest of people, and the smallest, black or white, male or female. Many people living in poverty have to deal with the stereo-types and there are many of those. Dick Gregory writes in his essay â€Å"The teacher thought I was a troublemaker. All she saw from the front of the room was a little black boy who squirmed in his idiot’s seat and made noises and poked the kids around him. I guess she could not see a kid who made noises because he wanted someone to know he was there† (192).This excerpt from his story describes the stereo-types of stereo-types, assuming that this little boy is a bad seed because of his color and financial background. Many emotional aspects are damaged in life because of many reasons, being poor can have a damaging result on your Self- Respect. People tormenting you, teasing you, making you feel unworthy, and unwelcome, unappreciated can ruin your self- esteem, making you feel exactly what they said you are. Gregory writes about a man in his story, a wino, which was living in poverty as well.The old man was hungry, went to a restaurant and to eat, and when it was time to pay he had no money. Gregory writes â€Å"The old wino sat down at the counter and ordered twenty-six cents worth of food. He ate it like he really enjoy ed it. When the owner, Mister Williams, asked him to pay the check, the old wino didn’t lie or go through his pocket like he suddenly found a hole. He just said: â€Å"Don’t have no money. † The owner yelled: â€Å"Why in hell you come in here and eat my food if you don’t have no money? That food cost me money. Mister Williams jumped over the counter and knocked the wino off his stool and beat him over the head with a pop bottle. The he stepped back and watched the wino bleed. Then he kicked him, and kicked him again† (195). Gregory made it strongly clear that this man had lost all self respect for him self, to just let the owner rag on him, and beat him. Poverty can make you feel worthless and like you do not deserve respect from anyone. Poverty can affect anyone; I have dealt with poverty first hand. When I was in eighth grade I went on a mission trip with my church to New Orleans.It was right after hurricane Katrina had hit and everything was de stroyed. Damage estimated was in the tens of billions of dollars. At least one million people in Louisiana, Mississippi and Alabama were without electrical power, and it took weeks to fully restore service to all affected regions. Clean drinking water was scarce, and the flood waters were covering city streets that were contaminated with gas from ruptured gas lines, chemicals and human waste, raising a serious danger of infectious disease.Poverty affected almost every single person in New Orleans. It was a heartbreaking trip but I was glad to be able to help people rebuild their houses and help them start new lives. I have also dealt with shame and how it can also make you feel worthless. I personally felt sad when I read parts in â€Å"Shame† about his teacher embarrassing him. This reminded me of a time when I was in elementary school. One day, in my fourth grade class, my teacher, Miss Brooks, called on me to give the answer to a geography problem the class was working on. Although I was not afraid to speak out in class, most of the class was having problems with this particular problem, so I was not too confident I had the right answer. However, I gave the answer I had anyway, and it turned out to be wrong. At first, I was not too upset, but almost immediately, Mrs. Brooks began to laugh, and then the whole class started to laugh. I felt so sad and embarrassed that I almost fainted and fell out of my chair. I always remember that day as one of the saddest days of my life. These are just a few examples of how poor people can get pride and happiness from small actions that we do not understand.Also, we see how they can sometimes be misunderstood when they do these actions. In general, we should try to be more yielding and considerate of such people. We should see ourselves in these situations and try to understand. In conclusion, many children are in need of our attention. The best we can offer them is positive remarks and acknowledgment. Whatever we t ell them stays in their memory for a long time and would affect their thought processes. As seen in the â€Å"Shame† essay, the child felt humiliated by the teacher’s criticism. That criticism made him realize how different he really is.

Cause and effect Essay

I am going to be talking about the cause and effects of peer pressure on today’s teens. Most of the time peer pressure is caused when teens develop the strong desire to fit in and be accepted by others. In high school most teens think that to fit in they have to be noticed and do whatever the â€Å"popular crowd† is doing, even if that means they will get in trouble. What some parents don’t realize these days is that they have a strong influence on their children’s lives and how they handle day to day issues. When you’re tuff and set good guide lines for your child and teach them wrong from right they will be less tempted to do wrong because they will have guidance. Some off the effects that peer pressure can cause can be harmful or lead to being kicked out of school. When teens are persuaded into doing the wrong thing there is going to be consequences for their actions. It could result in the child being kicked off of their team, out of school or even worse, they could end up in jail. The causes of peer pressure are very real in today’s society and if your teen or child isn’t careful who they hang around, they might be pressured into doing the wrong thing. Make sure to talk with your child and let them know that you are there for them and they can come to you whenever they need to talk about something.