Solar Power Generation Essay Example | Topics and Well Written Essays - 1000 words

Solar Power Generation - Essay Example This is by far the primary consideration in the operation of power electronic devices. In Solar power generation, light from sunshine is converted by photovoltaic (PV) Solar panels into direct current (DC) electricity. For power electronics (in today's world and in the future) to enhance Solar power generation, this aspect (efficiency) is a vital consideration. Solar panels generally have a conversion ratio or Solar panel efficiency, which is an indication of their energy-conversion capability. PV enhancement strategies must include design considerations that improve their current efficiency level, which is presently estimated at a maximum of about 17.5% (Greenpeace, "Solar Generation"), and a minimum of 6% (IEA, "Renewables for Power Generation"). The thickness of crystalline silicon used in PV production however needs to be carefully balanced against the desired increment in efficiency. This is due to the fact that efficiency tends to decrease with the thickness of the Silicon mate rial. Perhaps some attention could be paid to optimising the spacing and inclination of PV panels (Geuder, Norbert et al). It might also help to look closely at enhancing PV efficiency through more focused use as ground receiver to capture maximum irradiation, with permanently varying solar angle (Geuder et al).It is also a vital aspect of power electronic-for-solar power strategy to consider the enhancement of the absorption efficiency of the PV solar panels. Energy conversion wastage is not acceptable in solar power generation, as there is relatively little power to waste- the largest PV plants have a capacity of just under 60MW. Power transfer losses may also be minimised by specifying the voltage capacity(Guidelines for Solar Power Generation) as a means of reducing availability of wastable voltage . Grid strategies Solar generated power can be harmoniously used with grid (conventional) electricity, through proper incorporation of power electronics. In the increasingly environment-conscious world, as less of conventional energy consumption is desired, less grid electricity will feature in mainstream power supply. Hence hybrid systems can be enhanced, supported by power electronics- the grid system can act as a storage system receiving excess power generated by the photoelectric systems during the day and exporting needed energy back into the PV system during a shortfall period, such as night time. Through Inverters converting DC to AC for the grid, for instance, there can be significant augmentation and increase of solar power generation; likewise stand-alone systems can benefit from Inverters and batteries applied for AC usage systems. The grid-connected PV systems need a wide range (Greenpeace, "Solar Generation") of power classes to be properly adaptable to the flexibilities of grid power app lication. Power capacity The power capacity of PV solar panels can be enhanced for greater output in solar power generation. By paying close attention the weather, suitable operating conditions can be exploited for PV arrays. Further, by choosing an appropriate time of day, PV

Gang Activity in the United States Essay Example | Topics and Well Written Essays - 1500 words

Gang Activity in the United States - Essay Example Currently, youth gangs are difficult to define because the nature and behavior of gangs vary considerably from one geographic area to another. However, the term "youth gang" is used to distinguish it from "street gangs" who are groups of adults engaged in criminal activities. Youth gangs are generally a loose organization of three or four young people between the age of 12 and 24 who usually have a name for the gang as well as distinctive clothing and hand signs. Gang membership is more or less permanent and is often characterized by delinquent behavior. (Powell and Egley, 2007) Youth gang activities were surveyed between 2002 and 2005 and the average number of gangs is 25,000 nationwide. For this period, the National Youth Gang Survey Analysis came up with the following statistics: When adult supervision, traditionally found in the home or at school, is alienating, ineffective or absent, the chances are the youth will form into groups to establish some structure, usually at a common place of congregation such as the public park or community center. Many of these young people are left to their own devices and have much time on their hands. When a group of young people has few opportunities for future careers, this tends to solidify the group's identity into a gang. There is no nationwide trend for the surge or ebb of youth gang activity, although larger cities appear to have a stable, persistent problem with gangs while rural and suburban counties report variable bouts of gang problems. (Powell and Egley, 2007) The 2001 National Youth Gang Center (NYGC) reported that 67% of gang members in large cities (New York, Rochester, Washington, Denver, Colorado and Seattle) were 18 and older while 17% were under 14 years old. Most of the surveyed