Bela Pinga Ltd Company Essay Example | Topics and Well Written Essays - 1500 words

Bela Pinga Ltd Company - Essay Example Database Management System (DBMS) can achieve this. By doing this Bela Pinga Ltd. business will achieve Speed of response, Accuracy of Information, Cost-Effective Transaction, Low Overheads and Maintaining Service Standards. This report will analyze the sales processing (Sales Department) of the Bela Pinga Ltd, which is located in Commercial Street, Sheffield, receives and processes sales orders from customers. In the initial section, the application domain of the potential user(s) and requirement analysis of the sale office will be presented. After that, E-R Model and Relational Data Model (RDM) will be analyzed for sale office system. In the last section of the report database overview and screenshots of the database (Microsoft Access Database System) made will be shown. The Information (Database) System will be made in Microsoft Access database system for sales order processing views for â€Å"Bela Pinga Ltd†. This will serve as the prototype for the final version that will be based on a combination of Linux, Apache, MySQL, and PHP. This Information system will be used by for the sales order processing view. The potential user of the Information system will be customers who place orders and the sales assistants who check the availability of the desired type of wine in Bela Pinga Ltd stores at the Logistics Department in Nottingham Street, Pitsmoor, Sheffield. However, if the quantities of the desired type of wines are not available, then sales assistants notifies it to the Purchasing Department, which is further taken care by the Purchasing department and is out of scope for this assignment (assumption). Figure 1 shows the E-R Model for the Sale Order Processing View of Bela Pinga Ltd. The four major entity identified are Customer, Order, Wine Details, and Invoice.  

Speculating about causes Essay Example | Topics and Well Written Essays - 1250 words

Speculating about causes - Essay Example Employees may get retrenched for example when a firm no longer needs the services of the employees or if the company itself shuts down its operations. It is usually not easy to find to find an appropriate job immediately after being laid off. A company would not desire to appoint somebody recently laid off for bad reasons such as failure to do a good job, absence from work, theft or drunkenness in work. It makes someone sacked to find alternative employment immediately. In some cases, the economy of a country might be undergoing turmoil making job hunting difficult. Other individuals are unable to get employed because they lack the required level of qualification and experience for a particular job. Some organizations will not hire someone without getting a good reference and remark concerning the prospective employee. Employers all the time appoint the best-qualified individuals for its vacant positions available. Many individuals are in no position to come across jobs because they are disabled or have health issues. For example, if one gets injured in an accident or gets ill for a prolonged time the person may be unable to do work hence remain jobless (Greenhalgh 103) . Each act comes with an outcome. However, the effects and causes and of joblessness are very powerful the life of the affected individuals. For instance, an employee lacking the suitable and appropriate skills required for a task will get retrenched or fired from a company. An individual may be jobless or get sacked from their job when a company wishes to cut on its budget. Similarly, in a case where there are plenty of workforces but not enough work to match them, their number will be reduced to ensure the company does not waste resources. On the other hand, if there is an abundance of jobs, but the employees lack the correct experience or skills to work then the their replaced will occur. Job losses are beginning to rise steadily, and

Effect of Green and Black Teas Essay Example for Free

Effect of Green and Black Teas Essay Determining the efficiency of various types of teas and its components, and the binding of tea with lipoproteins as for prevention of the occurrence of coronary heart diseases, is the primary objective of the study. Based on established scientific researches, one of the components of tea called phenols, are responsible for producing the antioxidant attributes of tea. Further studies prove that both black and green teas have almost the same phenol content. Thus, their antioxidant strength is also the same, as gauged through the use of the phenol antioxidant index (PAOXI). Moreover, the study establishes the idea that a combination of tea catechins and lipoproteins produce stronger antioxidant qualities. (Vinson Dabbagh, 1998a) To accomplish the objective of the study, teas that were used for samples were prepared using the same process. These samples were then compared to other types of antioxidants and other beverages with phenolic content. Moreover, the teas were studied in order to find out the threshold for the production of antioxidant properties, and also the binding of antioxidants with lipoproteins. Vinson Dabbagh, 1998a) The results of the study revealed that green tea produces higher antioxidant activity than the black tea, the green tea and black tea were stronger antioxidants than other beverage samples, the PAOXI of both green and black teas do not exhibit significant differences in terms of antioxidant strength, and the lipoprotein binding for both teas remain the same. Moreover, the catechins found in teas were more effective than vit amins C, E and beta-carotene in binding with lipoproteins to complete oxidation. Therefore, teas are more efficient in lowering the risks of coronary heart diseases. Green teas were found to bind efficiently with lipoproteins of high amounts, and on the contrary, black teas were said to bind efficiently with lipoproteins of low amounts. (Vinson Dabbagh, 1998a) Secondary Source The discovery of the connection between oxidation and atherogenesis has incited research studies about the effects of antioxidants found in teas to lipoproteins. Moreover, studies conducted on flavonoids, which is one of the components of tea, and its contributory effects to the prevention of the occurrence of coronary heart disease, has led researchers to speculate that catechins that are found in tea might be instrumental in promoting health and wellness due to the antioxidant attributes produced by teas. (Vinson Dabbagh, 1998b) This particular research study aims to identify the efficiency of teas as a source of antioxidants as compared to other beverages with the same phenolic content, and the maximum threshold of the production of antioxidant mechanisms in teas. Moreover, research was conducted on the effects of binding antioxidant with lipoproteins to an individual with low antioxidant intake. (Vinson Dabbagh, 1998b) The results of the research reveal that catechins that are found in teas are more effective antioxidants as compared to other vitamins that claim to be a good source of antioxidants, such as vitamins E, C and beta-carotene. Moreover, the research also discovered that teas bore the most amount of phenolic content as compared with other beverages that were tested, and that among the tea samples that were tested, green tea bore the most amounts of phenolic content. In addition, antioxidant binding with lipoproteins was most efficient with black teas as compared to other teas, although there was not any significant difference as to the effect when comparing it to the results of other teas. (Vinson Dabbagh, 1998b) In conclusion, the research study reaffirmed the fact that teas are a great source of antioxidant and that they are effective in producing high levels of antioxidants that are needed by the human body. Therefore, an individual’s regular intake of tea prevents the onset of lipoprotein oxidation within the body. (Vinson Dabbagh, 1998b) Personal Opinion about the Topic The results of the study has proved the effectiveness of teas as a source of antioxidant, therefore supporting previous studies conducted about the relationship between catechins and phenolic acid that are found in teas and its binding with lipoproteins as instrumental in the lowering of risks caused by coronary heart diseases. If this is the case, then regular intake of green and black teas should be recommended to people who are at risk for coronary heart disease and should be recommended as part of the average person’s diet in order to avoid the occurrence of the said disease. Although plants where tea comes from are widely grown all over the world, and according to the study, tea is the most popular drink in the world, people still do not realize the importance of its content and the regular intake of tea as a protective instrument against coronary heart disease. Moreover, people are not aware that the beverage that they enjoy the most has health benefits that might save them from suffering heart diseases. Promotion and recommendation of teas that are based on research study results and information dissemination might help in encouraging people to drink tea as part of their diet in order to stay fit and healthy. Aside from advertising and promotional activities, the government should support or fund the horticultural industry in order to produce more sources for green and black teas. Not only will the people benefit from this, but the government will also gain profit for the tea industry and agriculture. Moreover, the government should look into the processes of preparing teas. As the research study suggests, that the amount of phenols within the tea leaves, which are said to be the ones responsible for producing antioxidants, are dependent on the weather and climate, age of the tea leaves that will be used, and the horticultural processes that the leaves underwent. Therefore, the government should further look into the processes from which tea leaves are produced. Desirable and specialized horticultural processes should be employed in growing plants in order to ensure the quality of tea leaves that will be grown from it. In order to accomplish this aim, the government should be able to conduct research studies that would prove to be instrumental in the efficient and productive growth of plants. Moreover, with further studies and in depth research, the government should fund the inclusion of teas in the diet of patients in the public health care system, especially those who are suffering from coronary heart diseases, patients who are at risk, and even all the patients in order to keep strong and healthy. However, further studies should be done independently in order to avoid judgments of researches that are tainted by underlying motives such as advertising. In the research study conducted by Vinson Dabbagh, it was funded by the Lipton Tea Company. Since the Lipton Tea Company is a business organization, which produced tea all over the world, I cannot help but think of the politics between business and advertising that is concealed in the research. Most especially because the results of the research promoted the efficiency of green and black teas among other beverages and its importance as a prevention scheme against coronary heart diseases. In order to invalidate speculations that might arise from the influence of Lipton Tea Company and the research, independent studies should be conducted by professionals and scholars alike from different fields related to the issue such as representatives from the health care industry, agriculture, government, universities, and scientists alike.

Environmental Impact of Fossil Fuels

Environmental Impact of Fossil Fuels The pollution of large combustion plants comes from fossil fuel such as: coal, oil (petroleum) and natural gas Fossil fuel: have been formed from the remains of organisms which lived hundred of millions of years a go. There are three main types of fossil fuel: Coil, oil (petroleum) and natural gas. Coil was formed from the remains of tree and plants which grew in swamps. Oil it is formed from the sea, the sea contains many tiny animals and plants called plankton, they get their energy to live and multiply from sunlight. When they die they sink to the bottom of the sea. Those that died millions of years ago, form oil and gas which are the main sources of fuel. Natural gas is mainly made up of methane, which is given off by anaerobic bacteria breaking down some of the organic matter which formed oil and coal. Fossil fuels are burned to producing energy, Pollution is defined as the contamination of air, water or soil by materials that interfere with human health, the quality of life, or the natural functioning of ecosystems. Air pollution is the pollution of the atmosphere by emissions from industrial plants, incinerators, internal combustion engines and other sources. Pollutants can be classified as either primary or secondary. Primary pollutants are substances directly produced by a process, such as ash from a volcanic eruption or the carbon monoxide gas from a motor vehicle exhaust. Secondary pollutants are not emitted. Rather, they form in the air when primary pollutants react or interact. An important example of a secondary pollutant is ozone-one of the many secondary pollutants that make up photochemical smog. (Pepper, I.L C.P Gerba M. L Brusseau. 1996) Source Large combustion Plants refers to the coal power station, Oil refinery, natural gas processing plant and others Coal power plant Coal is composed of carbon, sulphur, hydrogen, oxygen and nitrogen. In a coal power station pollutants are formed by the burning of the fossil fuel coal. Burning coal at high temperature will produce oxides of nitrogen. Inside the coal are compounds of sulphur and nitrogen. These originate from the dead organisms that make up the coal. When the coal is burnt the Sulphur and Nitrogen is oxidised producing SOX and NOX, which are released into the atmosphere as primary pollutants. The NOX produced from combusting the Nitrogen in the coal is called fuel NOX. There is also NOX produced by the combustion of Oxygen and Nitrogen in the air. This is known as thermal NOX.  (Peirce, J.F R.F.Weiner P.A. Vesilind.1998) When a fuel burns, it reacts with oxygen to form oxides.   If the fuel burns completely, then all the carbon in it is turned into carbon dioxide which is slightly acidic.   If there is not much air available, the carbon may be turned into carbon monoxide, which is a very poisonous gas. The main primary pollutants created by a coal fired power station are NOx, SOx and VOCs. Sulphur oxides are created from the burning of the coal. Coal naturally contains sulphur, the amount of which varies depending on which organisms created the coal. When the coal is burnt, so also is the sulphur. When a fuel burns, it reacts with oxygen to form oxides.  If the fuel burns completely, then all the carbon in it is turned into carbon dioxide which is slightly acidic.   If there is not much air available, the carbon may be turned into carbon monoxide, which is a very poisonous gas. The carbon dioxide released by the coal power plant causes climate change and global warming, coal fire power plants are the main contributor to co2 in the air. Proteins in living organisms contain nitrogen. When coal burns, Nox is formed in the following ways: When nitrogen bound in the coal is released and combines with oxygen to form fuel Nox.   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  When high combustion temperatures break apart stable nitrogen molecules in the air which then recombine with oxygen to form thermal NOx.    Primary pollutants formed in a coal fired power plants are: Nox formed at high temperature and pressure of the combustion causes the atmospheric nitrogen and oxygen to react. VOCs (Volatile Organic Compounds) produced when unburnt hydrocarbons are released through the chimney of the furnace. Carbon monoxide is a gas formed as a by-product during the incomplete combustion of all fossil fuels. Exposure to carbon monoxide can cause headaches and place additional stress on people with heart disease.   Sulphur dioxide mostly comes from the burning of coal or oil in power plants. Sulphur dioxide reacts in the atmosphere to form acid rain and particles.  And is also a major contributor to photochemical smog. Nitrogen oxides and sulphur oxides are important constituents of acid rain. These gases combine with water vapour in clouds to form sulphuric and nitric acids, which become part of rain and snow. As the acids accumulate, lakes and rivers become too acidic for plant and animal life. (Peirce, J.F R.F.Weiner P.A. Vesilind.1998)             Impact Coal Fired Power Stations Coal-fired power stations are major sources of pollution. The extensive use of coal is because there is a lot of it around. Although it produces pollutants coal is an important fuel for some considerable time to come.   A coal-fired power station has three main inputs: coal, cooling water pure water to use in steam turbines. The main outputs are electricity, waste heat, CO2, SOx, NOx and ash. Fossil fuels are also linked to the decrease of air quality. Clean air is essential to life and good health. Several important pollutants are produced by fossil fuel combustion: carbon monoxide, nitrogen oxides, sulphur oxides, and hydrocarbons. In addition, total suspended particulates contribute to air pollution, and nitrogen oxides and hydrocarbons can combine in the atmosphere to form tropospheric ozone, the major constituent of smog. Coal-fired power stations are responsible for the diffusion of greenhouse gases such as carbon dioxide. The amount of carbon dioxide in the atmosphere must be carefully balanced to maintain the greenhouse effect, which is what keeps the surface of the earth warm enough to support life. Like all things in nature a change in one part of the environment can result in changes in another.    The effect of increased greenhouse gases in the environment is that the temperature of the atmosphere is expected to increase. It is predicted by some scientists that this temperature increase could result in the following: The destruction of ecosystems such as the Great Barrier Reef. A change in the worlds weather patterns, resulting in an increase in both intensity and frequency of storms, cyclones, floods and droughts. The melting of glaciers and polar ice. Rising sea levels resulting in the permanent flooding of vast areas. Economies may be affected by the destruction of crops and industry.   The effect of releasing gaseous acids into the atmosphere, as a result of modern lifestyles, results in Acid Rain and more serious Global Warming. The effects of global warming is of such great concern that many nations agreed to reduce greenhouse gas emissions.   Mining the coal that is to be used in the generation of electricity results in the destruction of the environment. Water systems can be threatened from the run-off as a result of the washing of coal. The pollution that is caused by the means of acid rain can have a variety of effects on the environment that are mostly negative such as; acid rain being a form of chemical weathering on buildings that are constructed from limestone or marble.   Acid rain can also contaminate water supplies by dissolving the lead and copper pipes which transport the water to houses and other buildings. Another effect of acid rain is the pollution that is caused on lakes and reservoirs killing most of the wildlife, this includes trees plants and animal habitats    Acid rain also affects rivers and lakes, as the acidity levels go up, the pH level falls. With the pH of water below 4.5 most fish will die, this will have a detrimental effect on wildlife as if the fish die the birds that feed on the fish will also die. SOx emissions All living organisms contain compounds of sulphur which are the origin of the sulphur found in coal. When coal burns, the sulphur compounds are converted to oxides of sulphur. Sulphur Dioxide exposure can affect people who suffer from asthma or emphysema by making it more difficult to breathe. It can also irritate peoples eyes, noses, and throats. Sulphur dioxide can harm trees and crops, damage buildings, and make it harder for people to see long distance. NOx Emissions The flue gases in the power station contain oxides of nitrogen (NOx). This is because fuels contain compounds of nitrogen formed from the proteins contained in organisms. When the fuel is burnt, these nitrogen compounds are oxidised to form fuel NOx .At the high temperature of combustion, atmospheric nitrogen and oxygen combine to form thermal   NOx High levels of nitrogen dioxide exposure can give people cough and can make them fell short of breath. People who are exposed to nitrogen dioxide for long time have a higher chance of getting respiration infection. Acid rain can hurt plants and animals, and can make lakes dangerous to swim or fish in Nitrogen dioxide also reacts with the oxygen or hydrocarbons in the presence of sunlight to form an irritating photochemical. Carbon monoxide carbon monoxide makes it hard for body parts to get the oxygen they need to run correctly. Exposure to carbon monoxide makes people fell dizzy and tired and gives them headaches. Ozone near the ground can cause a number of health problems. Ozone can lead to more frequent asthma attacks in people who have asthma and can cause sore throats, cough breathing difficult. It may even lead to premature death. Ozone can also hurt plants and crops. When the ozone in the stratosphere is destroyed, people are exposed to more radiation from the sun (ultraviolet radiation). This can lead to skin cancer and eye problems. Higher ultraviolet radiation can also harm plants and animals    Volatile Organic Compounds (VOCs): causes eye irritation, respiratory irritation, some are carcinogenic, and decreased visibility due to blue-brown haze Advantages Very large amounts of electricity can be generated in one place using coal, fairly cheaply. Transporting oil and gas to the power stations is easy. Gas-fired power stations are very efficient. A fossil-fuelled power station can be built almost anywhere, so long as you can get large quantities of fuel to it. Didcot power station, in Oxfordshire, has its own rail link to supply the coal. Disadvantages Coal is not a renewable resource. Coal-fire power stations create pollution. Mining coal damages the environment. During the production of electricity carbon dioxide is released, increasing the amount of greenhouse gases in the atmosphere. The main drawback of fossil fuel is pollution. Burning any fossil fuel produces carbon dioxide, which contributes to the greenhouse effect warming the Earth. Burning coal produces more carbon dioxide than burning oil or gas. It also produces sulphur dioxide, a gas that contributes to acid rain. this can be reduced before releasing the waste gases into atmosphere. Mining coal can be difficult and dangerous. Strip mining destroy large areas of the landscape. Coal-power stations need huge amounts of fuel, which means train-loads of coal almost constantly. In order to cope with changing demands for power, the station needs reserves. This means covering a large area of countryside next to the power station with piles of coal Sulphur dioxide, nitrogen oxide and nitrogen dioxide are also produced in these emissions and can produce acid rain. (Peirce, J.F R.F.Weiner P.A. Vesilind.1998) Monitoring Pollution Pollution is measured to ensure that the air quality are not exceeded Monitoring air pollution When monitoring air pollution it is important to know or decide what pollutants are to be monitored, where they should be monitored, what instruments are to be used for that purpose and what kind of weather base needs to be collected, and it is also important to figure out how many stations are necessary to meet this goal. Carbon monoxide is typically measured by using an infrared gas analyzer. With this instrument the absorption of infrared radiation by carbon monoxide in the sample air stream is compared with absorption in a reference gas of known carbon monoxide concentration. This method allows continuous non-destructive measurement of carbon monoxide in the sampled air Sulphur dioxide is generally measured by ultraviolet emission spectrometers. This approach is based on the principle that sulphur dioxide emits a measurable flux of radiation when irradiated with intense UV from a light source in the spectrometer. Nitrogen oxides are measured by chemiluminescence. Tow sequential chemical reactions involving ozone are used. First, NO is measured, then NO2. Infrared radiation is emitted during oxidation of NO to NO2 by ozone introduced into the instrument. The amount of radiation produced is proportional to the NO concentration in the air stream. To measure NO2, a catalyst is used to reduce all NO2 in the air stream to NO, whose subsequence reaction with ozone permits the indirect determination of NO2 Ozone concentration are generally measured by using a UV absorption spectrophotometer, although chemiluminescent-type instruments are also used. Various no-methane hydrocarbons are measured using such instruments as a gas chromatograph. Hydrocarbons are generally more difficult to measure than most other pollutants, and often require greater operator involvement in the measurement process (Pepper, I.L C.P Gerba M. L Brusseau. 1996) Monitoring of air quality has been undertaken by scientists for several years. The air taken into the sampler is drawn first through a white filter paper, on which any smoke present leaves a deposit as a stain a; greater or lesser blackness. It then passes through a reagent solution which traps any sulphur dioxide present and converts it to sulphuric acid. After a weeks sampling the seven sets of smoke stain and reagent bottle are brought to the laboratory for analysis. The smoke is determined by measuring instrumentally the loss of reflectance of the once-white filter papers, the reflectance values being convened into equivalent smoke concentrations from a standard calibration graph. The sulphur dioxide is measured by careful titration of the very weak acid solutions, followed by calculation of the results. They also monitor air quality throughout the district, using diffusion tubes and the air quality monitoring station. Contaminated land is a key project for the service, with the production of a contaminated land strategy. Monitoring gaseous emissions from soil and land fill Soils play an important role in controlling back ground concentrations of most air pollutants. Soil can either emit or take up from the atmosphere many trace gases, including NOx, N2O, CO2, and CH4. In general there are three different approaches to measure gas fluxes between soil, and the atmosphere and these are: Chamber approaches, micrometeorological approaches, and soil profile approaches. Monitoring of tropospheric pollutants    When monitoring tropospheric pollutants, an important step is to know which pollutants are present in the troposphere and how their concentrations vary. Chemists monitor the concentrations of tropospheric pollutants, to study patterns and learn about the rate at which certain reactions will take place in certain conditions    Studying individual reactions in the laboratory   To make predictions about pollution, chemists need to know what reactions take place and how quickly they occur. Many of these reactions involve broken down fragments of molecules called radicals. Reactions with radicals happen very quickly but other reactions happen very slowly. Chemists measure the length of time of these reactions to predict the rate at which a reaction will proceed for any set of conditions.    Modelling Studies      The information on rates of reactions is used in computer simulation studies to reproduce and predict the behaviour of pollutants during a smog episode. The more accurate the information used, the more closely the model simulates the observed behaviour.    Smog Chamber Solutions   These are laboratory experiments on a large scale. Primary pollutants are mixed in a huge clear plastic bag called a smog chamber and exposed to sunlight under carefully controlled conditions. Probes monitor the concentrations of various species as the photochemical smog builds up. The chamber has to be big to minimise any surface effects where the reactions take place on the walls of the container instead of the gas phase. Chemists monitor pollutants to find out exactly what pollutants are involved in smog formation, and how they vary in concentration. These changes in concentration can show changes in the atmosphere, for example the presence of sunlight.    Chemists study reactions to see which pollutants react with which. Most importantly, to see which radicals are formed where, because they are very reactive, and cause a lot of atmospheric reactions. The speed of these reactions needs to be measured to understand how fast substances are being made and destroyed.    Chemists can makes models of situations, to predict what will happen in the future. One such model is smog chamber simulations. These are huge plastic bags which are exposed to sunlight under controlled conditions. Analytical probes monitor the concentrations of different gases as the photochemical smog forms. Control One of the Methods for controlling air pollution include removing the hazardous material before it is used, removing the pollutant after it is formed, or altering the process so that the pollutant is not formed or occurs only at very low levels. Industrially emitted particulates may be trapped in cyclones, electrostatic precipitators, and filters. Pollutant gases can be collected in liquids or on solids, or incinerated into harmless substances.   The best way to control pollution is to control level of carbon emissions released into the atmosphere Using coal with low sulphur content    Power plants can use coal with low sulphur content.   As a result, less sulphur dioxide will be produced and the amount of sulphur dioxide in the flue gas will be significantly reduced.    Install scrubbers in power plants   Ãƒâ€šÃ‚  Power plants can install scrubbers to reduce the amount of sulphur dioxide in the flue gas.   The principle of how scrubbers can remove sulphur dioxide are given below:       Dry Scrubber   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Calcium oxide reacts with sulphur dioxide in the flue gas, forming insoluble calcium sulphite which is then filtered out in the flue gas.   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚     Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   CaO(s) + SO2(g)   CaSO3(s)       Wet Scrubber   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Calcium oxide is first allowed to react with water, forming calcium hydroxide.   Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   CaO(s) + H2O(1)   Ca(OH)2(aq)   Calcium hydroxide then reacts with sulphur dioxide in the flue gas, forming water and calcium sulphite.   Calcium sulphite is then filtered out.      Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚  Ãƒâ€šÃ‚   Ca(OH)2(aq) + SO2(g)   CaSO3(s) + H2O(1) (  Barret.R and F. Feates. 1994) Install electrostatic precipitator in power plants: Power plants can install electrostatic precipitator to reduce the amount of particulates in the flue gas.   Flue gas passes through the electrostatic precipitator.   The particulates in the flue gas are attracted by the electric field and then removed from the electrode.    Control the temperature in the combustion chamber: The amount of nitrogen oxides released can be reduced by reducing flame temperature and availability of oxygen in the combustion zone.   But the flame temperature cannot be too low, which would cause incomplete combustion and produce carbon monoxide.    The limestone process The other main way of reducing SOx emissions is to react them with calcium carbonate to produce gypsum for the building trade. This is a hassle as it has to compete with other brands, and be marketed. NOx emissions Coal fired power stations used to get the flames as hot as possible to increase the yield, but as the rate of reaction increases as temperature increases, the amount of thermal NOx (produced from the nitrogen and oxygen combining), increases to get the flames hottest the coal was powdered and mixed with an excess of air. Low NOx burners There is this type of burner, where the injection of air is controlled, so the flames are not as hot. This significantly lowers the production of NOx. Gas reburns The injection of ethane and methane (natural gas) reacts with NOx to produce nitrogen, carbon dioxide and water vapour. CH4 (g) + 4NO2 (g) à   2N2 (g) + CO2 (g) + 2H2O(g) Some of the alkanes will not react, and carbon monoxide is produced as a result of incomplete combustion. CH4 à   CO + H2O The alkanes and CO are then reacted with air to combust them completely. This oxidation is exothermic and so produces heat that contributes to the generation of electricity. (Barret.R and F. Feates. 1994) Conclusion Fossil fuels, like coal, oil, and natural gas, provide the energy that powers our lifestyles and our economy. One of the main uses of fossil fuels is: to generate electricity, fuel cars, and to heat or cool buildings Fossil fuel is one of humanitys most important sources of energy. Fossil fuel plays a major role in our economy and many of our current technology have been developed with fossil fuel in mind. However burning fossil fuel is damaging the Earths environment with the release of pollution to the atmosphere. In addition ecosystems are becoming damaged by the extraction of fossil fuel. Fossil fuels impact the environment greatly; carbon dioxide emissions contribute to harmful global warming and climate change. Inefficient burning of fossil fuels results in the production of carbon monoxide, which is a very harmful and poisonous gas.   Inhalation of this gas is likely to cause death as it interferes with the transport of oxygen in the blood stream Combustion of fossil fuels such as coal, oil and natural gas produces gases such as nitrogen oxides, which cause acid rain.

Language in Animal Farm :: Animal Farm Essays

Language is a very powerful tool. It is a means of basic communication, and has been around for centuries. Just like any other tool, language can be powerful in a positive or negative way, and can either work to one's advantage or can result in negative effects. Certain words can touch a certain chord inside someone, so they can be easily influenced by the language. A good example of this is George Orwell's Animal Farm, a fable in which a multitude of gullible animals are exploited by a group of power mongering pigs. Words can appeal to a persons basic needs and desires and conjure up hope or even fear in his or her mind. These emotions can be manipulated by others to their own advantage, and clever use of language can be used to cheat, deceive, spread rumors. In Animal Farm, Orwell shows how the pig's use of influential language manipulates and enslaves the animals. Through use of language, the pigs appeal to the animals basic hopes and desires of a better life and a better future. They make others work extremely hard, while they themselves rest and unfairly reap most of the benefits of the work. For example, â€Å"Now comrades,... to the hayfield! Let us make it a point of honor get in the harvest more quickly than Jones and his men do.† Later in chapter three, Squealer is sent to justify the pigs selfishness and to convince the animals that the pigs are working in their favor. He said, â€Å"You do not imagine, I hope, that we pigs are doing this in a spirit of selfishness and privilege? Many of us actually dislike milk and apples...Milk and apples contain substances absolutely necessary to the well-being of a pig...the whole management and organization of this farm depend on us.† This how the animals are persuaded to believe almost anything without question. Words that appeal to our fears make us feel vulnerable, and when we feel vulnerable, we are ready to do just about anything to make us feel invulnerable again. In Animal Farm, the animals feel very insecure deep down, but they also are gullible and they do not wish to go against the pigs. For example, Squealer tells them â€Å"Do you know what would happen if we pigs failed in our duty?

Abraham Lincoln Essay -- Biography Biographies Bio essays papers

  Ã‚  Ã‚  Ã‚  Ã‚  Four score and seven years ago, our fathers brought forth upon this continent a new nation: conceived in liberty, and dedicated to the proposition that all men are created equal. (Lincoln) Abraham Lincoln was a true American hero. He brought this country through a time of succession and rebellion, through his thoughtful planning, tyranny like leadership, and amiable individuality. He, with a half a nation of armed forces, liberated the slaves and united a nation. Abraham Lincoln was born on February 12, 1809, in a log cabin on a farm in Hardin county, Kentucky. He was the son of Thomas and Nancy Hanks Lincoln, and was named after his grandfather (Lincoln). Thomas Lincoln was a carpenter and farmer. Both of Abraham's parents were members of a Baptist congregation, which had separated from another church due to the disagreement of slavery. (needy pg 121) He as a young child spent a lot of the day doing one of two things; reading books, or doing household tasks. In 1816, when Abraham was 7, he moved with his family to Indiana. There his mother died in 1818 of a milk sickness, a disease obtained from drinking the milk of cows, which had grazed on poisonous white snakeroot. This devastated Abe "God bless my mother. All that I am and ever hope to be, I owe to her." (Lincoln) When he was 15 years old he often worked as a hired hand on other farms. While he plowed or split fence rails, he usually had book tucked in his shirt to read while on his lunch breaks. Once a farmer loaned him The Life of George Washington, by Parson Weems, and Abe accidentally left it in the rain. To pay for the damage, Abe shucked corn for him for three days. Throughout his life Abraham Lincoln made every effort to do be fair, hence he came to be know as "Honest Abe". This fairness that he learned in his child hood would stay with him the rest of his life. Using his skill as a speaker and Ethics on slavery Abraham and his running mate Hannibal Hamlin ran for the presidential seat for the Republican Party in 1860. They set out on a long campaign, of mostly northern states, sometimes they were the only ones traveling. They spoke many places such as Illinois, Missouri and many others. This devoted work paid off as Lincoln was appointed the 16th president of the United States of America November 6, 1860. (Norton) After the election was over the president and his wife moved to... ...ves in states like Texas, Louisiana, Mississippi and others, to break away from the slave owners and rebel. It also let the union troops have a reason to fight, they from that point on fought for freedom and to help the slaves in the slave states. The act also let black soldiers fight for the union side in the war. As perversely they were not aloud to do so. Although, the emancipation Proclamation was limited, it only applied to the slave states excluding the 4 slave union states. This was a try for Lincoln to help keep the 4 union slave states within the union. If they would have lost them the war would have turned out differently, the south might have won. Also, the emancipation proclamation didn't actually free anyone, as the south was not going to obey any of the union rules that they appointed. They would have to win the war to get the confederate sates to follow, by that point the law could just be changed to abolish slavery outright. Abraham Lincoln was the 16th president of the United States of America. He Was said to Free the slaves he was a great American hero to us all. Not only was he the greatest president to ever live but he was a man that united a broken country Abraham Lincoln Essay -- Biography Biographies Bio essays papers   Ã‚  Ã‚  Ã‚  Ã‚  Four score and seven years ago, our fathers brought forth upon this continent a new nation: conceived in liberty, and dedicated to the proposition that all men are created equal. (Lincoln) Abraham Lincoln was a true American hero. He brought this country through a time of succession and rebellion, through his thoughtful planning, tyranny like leadership, and amiable individuality. He, with a half a nation of armed forces, liberated the slaves and united a nation. Abraham Lincoln was born on February 12, 1809, in a log cabin on a farm in Hardin county, Kentucky. He was the son of Thomas and Nancy Hanks Lincoln, and was named after his grandfather (Lincoln). Thomas Lincoln was a carpenter and farmer. Both of Abraham's parents were members of a Baptist congregation, which had separated from another church due to the disagreement of slavery. (needy pg 121) He as a young child spent a lot of the day doing one of two things; reading books, or doing household tasks. In 1816, when Abraham was 7, he moved with his family to Indiana. There his mother died in 1818 of a milk sickness, a disease obtained from drinking the milk of cows, which had grazed on poisonous white snakeroot. This devastated Abe "God bless my mother. All that I am and ever hope to be, I owe to her." (Lincoln) When he was 15 years old he often worked as a hired hand on other farms. While he plowed or split fence rails, he usually had book tucked in his shirt to read while on his lunch breaks. Once a farmer loaned him The Life of George Washington, by Parson Weems, and Abe accidentally left it in the rain. To pay for the damage, Abe shucked corn for him for three days. Throughout his life Abraham Lincoln made every effort to do be fair, hence he came to be know as "Honest Abe". This fairness that he learned in his child hood would stay with him the rest of his life. Using his skill as a speaker and Ethics on slavery Abraham and his running mate Hannibal Hamlin ran for the presidential seat for the Republican Party in 1860. They set out on a long campaign, of mostly northern states, sometimes they were the only ones traveling. They spoke many places such as Illinois, Missouri and many others. This devoted work paid off as Lincoln was appointed the 16th president of the United States of America November 6, 1860. (Norton) After the election was over the president and his wife moved to... ...ves in states like Texas, Louisiana, Mississippi and others, to break away from the slave owners and rebel. It also let the union troops have a reason to fight, they from that point on fought for freedom and to help the slaves in the slave states. The act also let black soldiers fight for the union side in the war. As perversely they were not aloud to do so. Although, the emancipation Proclamation was limited, it only applied to the slave states excluding the 4 slave union states. This was a try for Lincoln to help keep the 4 union slave states within the union. If they would have lost them the war would have turned out differently, the south might have won. Also, the emancipation proclamation didn't actually free anyone, as the south was not going to obey any of the union rules that they appointed. They would have to win the war to get the confederate sates to follow, by that point the law could just be changed to abolish slavery outright. Abraham Lincoln was the 16th president of the United States of America. He Was said to Free the slaves he was a great American hero to us all. Not only was he the greatest president to ever live but he was a man that united a broken country

US Immigrants’ Learning English and Mastering Content Goals

Bilingual Education is the teaching of two languages. This would also be the ability to speak two languages. During the 1920's testing among various groups of people began. These tests were conducted in poor testing conditions, overcrowded rooms, poor lighting, and large rooms with poor audibility. Many immigrants were categorized as â€Å"simpletons† for receiving zeros on the test because they were unable to speak English, could not read, and were unfamiliar with the American culture. The low-test scores confirmed white Anglo Saxon Protestant beliefs that immigrants were inferior. This gave the congressmen more reason to discriminate against the immigrants. In the 1950's, federal and state laws ruled that discriminatory testing was unconstitutional (What To Do About Immigration? p 327). Bilingual education did not originally grow from the pressures of immigration. It was started as a small, federally funded program to help Mexican-American children (largely native-born) in the Southwest. The purpose was to try to make Mexican-American children fully literate in English. Today, our expectations of bilinguals are very high. We expect them to learn our language fast and accurately. However, we do not teach them well. Instead of running away from this problem by abolishing bilingual education, we should find a way to improve this practice in order to make it a part of our culture. People with a native language other than English have two goals in school: learning English and mastering content. A very big problem is that bilingual education is taught in many different ways in classrooms. Often, students with limited English skills would be taught for no more than a year in special English classes before being moved to mainstream. Some students are pulled out of English as a second language. Others are placed in transitional bilingual education, which is intensive English-instruction. A portion of this class is taught in the native language. Maintenance or developmental, bilingual education builds the native language while improving English as a second language (http://www. edweek. org/context/topics/biling. htm). One solution to this problem is finding a one way to teach that will cover all aspects of the English language. After English is effectively taught, the students should be mainstreamed. Some say the curriculum is not the problem, but the poor teaching instead. The teache's want students to be proficient in a second language in one or two years. These days, there is also a shortage of well-qualified bilingual teachers. We can improve this by hiring teachers who are qualified and fully bilingual (http://www. edweek. org/context/topics/biling. htm). If we take a closer look at the educational system, we would notice that bilingual education is not the only guilty party in this stuation. There are many services available in different native languages; there is not much of an emphasis to learn English. There are newspapers, advertising, and even signs that will help immigrants of all cultures. Some people believe that in order to ensure that English is learned the government should make English its official language. I believe that people with another native language other than English should learn our language. This is not to say that they can not use their other language, but English should be used in offices and other work places. Today, the amount of bilingual immigrants entering our country is growing year by year. If solutions aren't found to the bilingual education problem, I fear what the future may hold for those looking to find new opportunities on American soil. In America, everyone has the right to dream.