Tuesday, January 28, 2020

Renewable Energy Essay Example for Free

Renewable Energy Essay Climate change is one of significant issues that have been considered in recent years. According to Anderson (2009), most climate researchers recognise it is essential to reduce 80 percent of global greenhouse gas (GHG) emissions by 2050 to prohibit effects of climate change. Furthermore, carbon dioxide (CO2) is one of the most important causes to produce GHG which is combusted from heating, transportation and electricity generated by fossil fuels. However, one of the solutions for reducing CO2 emissions is using renewable energy to replace fossil fuel. In addition, renewable energy is generated by natural resources such as sunlight, wind and biomass which produce less or no pollution when generate energy. Furthermore, renewable energy will be demanded for approximately half of the worldwide electricity supplies to reduce CO2 emissions by 2050, which it is estimated by The International Energy Agency (Cited in Shi 2010). This essay will focus on two forms of renewable energies which are solar power and biofuels. Firstly, solar energy has been widely used to generate heat and electricity recently. Moreover, it will show the benefits and also point out some drawbacks of solar energy. After that, the discussion will describe the second form of widespread renewable energy in the transport sector which is biofuels. Finally, it will reveal advantages and a disadvantage of this energy. This essay argues that renewable energies, which are solar power and biofuels have been extensively utilised in recent years. Furthermore, they have more advantages than disadvantages. Solar Energy The sun is the largest source of energy, which is transformed to solar power for generating heat and electricity and has been widely used in recent years. According to European Union (2011), there are several applications to use solar energy for heating such as hot water at home, heating in factory and building and swimming pool. In addition, a cooling system also uses solar energy as heat absorption system to generate air conditioning and cooling system in refrigerator. Moreover, this kind of energy can be transformed to generate electricity by two ways. First of all, Prasad Bansal (2011) state that electricity is converted directly from light by Photovoltaic (PV) via semiconducting materials, whose basic composition is solar cells. Furthermore, Concentrating Solar Power (CSP) is another way to generate electricity, in which parabolic solar tower focuses the light to be used for a single point heating, and then produces steam to impel a turbine (European Union 2011). However, PV and CSP can collect electricity in the different ways. PV plants store the energy by connects to batteries, or sent to the electricity grid. On the other hand, CSP system can store heat by itself. Therefore, this power can be generated during the absence of sunlight during the day and night time (European Union 2011). Although there are many reasons for using solar energy, there are some reasons against the use of this kind of energy such as limited condition and the high cost. Firstly, the most significant problem of solar power supply is this energy is not available during the absence of sunlight (especially at night). Furthermore, in winter that often has cloud cover, there are only a low amount of solar power is available (Lakatos, Hevessy Kovacs 2011). However, this issue can be overcome with the use of CHP as it can store the power by itself. Therefore, it can be used during the absence of sunlight. In addition, thin film photovoltaic (PV) power is another solution of the places that have cloud cover. According to Blakeslee (2012), there are three layers in thin film PV for covering a wider spectrum of light. Thus, the light is scattered in all directions by clouds more than usually block it. Secondly, another disadvantage of solar is the high cost is considered as another obstacle of solar energy. As he states that, â€Å"A recent NYU study found the following actual 2005 costs in cents/kWh: Geothermal 3.1-4.3 Biofuels Energy Another widespread renewable energy is biofuel which has been developed to use instead of fossil fuels in the transport sector. There are two principle forms of ‘biofuels’ which are biodiesel and bioethanol. First of all, most of biodiesel is created from oil which is produced by oleaginous plants such as sunflower, rapeseed and palm by reacting with methanol (European Union 2011). Moreover, the viscosity of these oils decreases when they are heated. In addition, Adelekan (2012) points out that these oils can be transformed directly to a diesel engine when they burn, or they can be generated to produce fuels as biodiesel by chemical process. Another form of biofuel is bioethanol or ethyl alcohol which is burned easily to produce a flame, which is generated by distilling products from the sugars and maize when they are fermented such as sugar beet, cereals, sugar cane or biomass (Ortiz et al. 2011). In many countries, there are an increasing number to use bioethanol as ga sohol or oxygenate in gasoline. In addition, bioethanol is elementary to process and manufacture (Adelekan 2012). As well as solar power, using biofuel also brings some disadvantages such as an impact on demand for food. According to Habibah (cited in Adelekan 2012), A huge demand for crops, sugar and oleaginous plants might be impacted from the demand for biofuels which will be result for an increasing cost of food price, increasing level of poverty and food insecurity problem. In addition, biofuels are enemy for agricultural land that would have been used for growing food crops despite being used for growing energy crops now (Adelekan 2012). Therefore, the number of lands for agriculture would be decreased that would have an effect on shortage of food. However, if the government launches the policy of regulation to use agriculture land for growing energy crops, this issue would be overcome. Conclusion In conclusion, there are several significant benefits in the use of renewable energies which are solar power and biofuels to be utilised for replacing fossil fuels. As can be seen in the discussion above, solar energy can be transformed to generate heat and electricity with Photovoltaic and Concentrating Solar Power. In addition, biofuels, another renewable energy can be used in transport sector to replace fossil fuels such as biodiesel and bioethanol. However, although there are some disadvantages of both kinds of energy, their effectiveness is greater. In addition, these obstacles could be overcome in the near future. Therefore, the use of these renewable energies could be the essential alternative way to reduce CO2 emissions for the solution of climate change.

Monday, January 20, 2020

Panama :: Essays Papers

Panama The official name of Panama is the Republic of Panama or (Repà ºblica de Panamà ¡). Panama is located on the narrowest and lowest part of the Isthmus of Panama that links North America and South America. This part of the isthmus is situated between 7 ° and 10 ° north latitude and 77 ° and 83 ° west longitude. Panama is slightly smaller than South Carolina, approximately 77,082 square kilometers. The country’s two coastlines are referred to as the Caribbean and Pacific, rather than the north and south coasts. To the east is Colombia and to the west Costa Rica. Pacific. Dominant features of their landform is highlands forming the continental divide. The higher elevations near borders with Costa Rica and Colombia. The highest point in the country is the Volcà ¡n Barà º which rises to almost 3,500 meters. The lowest elevation is in the middle of the country where it is crossed by the Panama Canal. Most of the population is on the Pacific side of the divide. The population of the country is around 2.8 million with a growth rate of 1.5%. The racial and ethnic groups are 65% mestizo, 14% African descent, 10% Spanish descent, 10% Indian. The religion is 85% Roman Catholic, 5% Protestant, and 5% Islamic. Spanish is the official language, though United States influence and the canal zone reinforce the use of English as a second language. Panama's arts show its ethnic mix. Indian tribes, West Indian groups, mestizos, Chinese, Middle Eastern, Swiss, Yugoslav and North American immigrants have all offer contributed ingredients to the culture. Traditional arts are woodcarving, weaving, ceramics and mask-making. The capital city is Panama City with major cities of Colon, Bocas del Toro, Potobelo, El porvenir, Santiago, Tocumen, La Palma, David, Balboa, and el Dorado. Political culture traditionally characterized by personalism, the tendency to give one's political loyalties to an individual rather than to a party. Politics from 1968 until his death in 1981 dominated by General Omar Torrijos Herrera, Their form of government is Executive under provisions of their 1972 Constitution, as amended in 1978 and 1983. The chief executive is president of the republic, he is assisted by two vice presidents, all elected by popular vote for five-year terms. The unit of currency is the Balboa which is equal to the United States dollar. Balboas are available only in coins.

Sunday, January 12, 2020

Decomposition: Poetry and Beggar Look Essay

Decomposition is a poem written Zulfikar Ghose. His poem is about a photograph of a beggar in Bombay. The poet talk about his first though of when he was taking they photo and know the poem is reflects on why he thinks the photograph was bad. He is able to get experience more visual with the use of poet techniques. The techniques the uses in the first stanza is simile about how the beggar look in Bombay. : â€Å"His shadow thrown aside like a blanket†. This description of the beggar suggests poverty and that beggar lives on the street, also that no one one cared about the beggar, as he was â€Å"thrown aside† suggesting discarded and not used any more. From the Simile and the word choice this makes the poem more interesting as we have a feel for the beggar situation and that he is being treated very badly and not like a human beginning In the second stanza the poet talks about the beggar appearance. : â€Å"Arms and legs could be cracks in the stone† This metaphor creates the image that the beggar is very thin and broken as the crack in stone suggest that he is very small and can fit in it and that the stone has been broken and the stone is a symbol of the beggar. The beggar has been homeless for a long time as it’s the, â€Å"ants journeys, the flies’ descents†. The beggar is use by and flies this suggests that the beggar hasten moved in a long time and give the sense of him being dead or dirty as insects like dead or dirty things. This give the poem a sad idea of the beggar that will keep the reader interested as he wants know if the beggar get treated better by society. The poet uses a metaphor to explain and give the visual image of the beggar as, â€Å"he lies veined into the street, a fossil man†. This technique makes the reader sympatric for the beggar, as they know that the man (beggar) has become dehumanized. The idea vein in to stone shows that the beggar has been reduce to stone and that the once lived as he is know a fossil reminding us that there was a life there once. The poet has used enjambment in the third stanza. : â€Å" Behind him there is a crowd †¦ an old man asleep on the pavement†. The long sentence shows that crowd passing him like there is nothing there and the since there is no full stops this show that there is no one stopping at the beggar. The poet has made the poem more interesting for the reader as he giving the since that the beggar is visible and that know cares for him as they don’t want t help him. In the forth stanza first the reader thought the photo was a goof idea but after revisiting the photo he know understands what he did wrong. â€Å"I thought it them a good composition†. The poet think more about his personal benefit from the beggars suffering and not about exploiting money and satisfaction from someone’s suffers and misfortune. The poet shows his feelings towards what he thinks about the beggar with his word choice you can see how bad he feels. : â€Å"Glibly†. As it shows that the poet regrets his comment on the photo as he know become aware of the crowd not paying him any attention to his suffering and that he want to make art from someone’s suffering and hunger. In the last stanza the poet talks about the emotion he felt as he felt guilty about thinking picture of the beggar. : â€Å"Weeping into a pillow chides me now for my presumption†. The poet is distraught over the photo and the word, â€Å"Glibly† has connotations of reprimand this how that the poet was expressing his disapproval of taking the photo. This make the reader more interested about the poem as they know might feel they have a connection with the poet as they feel they know him and feel for him with but know taking the photo was fro the use of the writer techniques. Decomposition is a poem which the writer uses poetic techniques to interest the reader and have more influence over them with his message as think about something before doing it and that his techniques have made me want to read more of his poem as Decompositions was very engaging.

Saturday, January 4, 2020

My Plans For Your Future Career Goals - 1097 Words

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