The Pitfall of Why Do I Deserve This Scholarship Essay Samples

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Research Paper Topics For Middle School Thicker Questions

Research Paper Topics For Middle School Thicker QuestionsResearch paper topics for middle school thick questions are no different than any other. The more rigorous the questions, the harder the grade. There is no exact science to research paper topics for middle school thick questions, but there are some general guidelines.Research paper topics for middle school thick questions typically consist of grammar or spelling. Or sometimes they are more focused on writing. Although one will be judged by how well they present themselves. It is important to remember that the main purpose of these papers is to prepare students for a more in-depth examination.Most middle school students have their own computer and internet connection, and internet forums are frequently being used as a part of research paper topics for middle school thick questions. Whether the topic is about religion, social issues, or an extracurricular activity, it is important to do your homework and find the correct informat ion to write on. Sometimes, students actually search out online resources for specific research paper topics for middle school thick questions.Just because you decide to research paper topics for middle school thick questions, that does not mean that you should use one hundred percent of your brain when writing the paper. Some projects are better written, presented, and presented well. Research paper topics for middle school thick questions usually require three, four, or five major topics.Finally, you need to decide which research paper topics for middle school thick questions you want to tackle first. Most middle school students spend all their time studying one topic. Some may choose to have more diverse research paper topics for middle school thick questions. Another thing you may want to consider is which subjects you will use.Some students will go to high school to get a 'G' average and earn a diploma, while others are actually looking to get into the best college in the count ry, and have to do so in two years. It really depends on what your academic goals are.If you're studying for a test, research paper topics for middle school thick questions should be different. If you're going to a career fair, you may have more homework than you want to complete before you leave the house.

APA Style Ultrasound Charts

APA Style Ultrasound ChartsStudies show that a study done by the International Society for Audiology and Communication, has the ability to identify APA style ultrasound charts. It is quite difficult to find out the indicators from the word of a medical professional in order to make a study and identify whether it's authentic or not.In this case, the study will work on a formal study which is dedicated to establishing some techniques of communication. This study can be very important especially when it comes to detecting abnormalities in the patient's voice, which may harm their dignity and health. This is one of the best methods for those who are practicing the APA style ultrasound charts.There are certain points that should be taken note of when it comes to ultrasound imaging. In fact, this type of study has been devised by the International Society for Audiology and Communication to help them communicate with patients with an abnormal voice. A person should never be left in the dar k when it comes to the techniques of communication, as there are things that people should know and learn.Of course, the tests that these studies have helped many people with were the development of other ways to work with those types of injuries. The APA style ultrasound charts became a method for the detection of damage that was occurring in patients' bodies and bones. These tests also help doctors to understand the difference between normal speech and tumors, heart defects, different cases of heart failure, as well as children and adults who have problems.All these techniques could also determine if a person has a problem with their voice, which is why it's crucial for the doctors to have a better understanding of the effects that the speech changes could have on the patient's voice. It can also be used to decide what kind of treatments they will give a patient so that the voice will no longer be a problem. As much as there are studies that may help other medical professionals to do this, it would be quite useless if there's no tangible result.Ultrasound imaging can help to understand the mechanism by which a person can communicate, and will help doctors to properly assess the extent of damage. Thus, a great deal of techniques could be ascertained.Ultrasound imaging is one of the best ways to ensure that a patient's voice will not be affected, so that they can continue living with dignity. Some tools that are offered at clinics and hospitals could be used, but in order to develop the tests, it is important to get a professional to do it. This would be to be given the correct information and test results, and help the doctors to understand the effects on the body.

Sample Essay to Compare Contrast Dogs and Cats to Grade

Sample Essay to Compare Contrast Dogs and Cats to GradeA sample essay to compare contrast dogs and cats to grade is a very important part of the essay. You will want to highlight the main facts and make the comparison between the two groups to make it easier for your readers.Dogs are more closely related to each other than cats. Therefore, you will want to make this a point of comparison between the two. The main difference between dogs and cats is that dogs are better able to handle stress.Cats on the other hand are more stubborn than dogs. They also like to sleep a lot. While dogs are more affectionate. Therefore, you will want to use both of these characteristics as a point of comparison to show how much better the dogs are.Finally, the appearance of dogs and cats can be a big difference between the two. There are a lot of ways to show this by taking photos and pictures of them when they were puppies or kittens. Also, you can show the overall physical appearance to show how simila r they are.Dogs and cats may seem very different but they are all wild animals. Although they have different physical characteristics, they are still wild animals so a lot of animals have a similar kind of appearance.A lot of people don't like to read essays that compare dogs and cats because it makes them feel like there is something wrong with them. However, as a writer you need to show how the traits between the two are as real as possible. With a sample essay to compare contrast dogs and cats grade you can do this very easily.A sample essay to compare contrast dogs and cats to grade can really help you with making the best grade. Don't make a grade too high or too low, just make it so you can be proud of the work you put into it.

Solar Updraft Tower free essay sample

The future of this earth and mankind substantially depends on our ability to slow down the population increase in the Third World by civilized means. The key is to increase the standard of living, to overcome the inhumane poverty and deprivation. To achieve this traditional means will not suffice any longer as exemplified by a paradoxon: Those countries where agriculture provides more than 20 % of the gross national product are those also stricken by starvation! Development requires mechanization and energy. Energy consumption increases proportionally to the gross national product or prosperity while simultaneously the population growth will decrease exponentially. Many developing countries possess hardly any energy sources and their population doubles every 15 to 30 years! The results are commonly known: Civil wars and fundamentalism. If these developing countries are provided with only a humane and viable minimum of energy the global energy consumption will drastically increase! Who could supply such an enormous amount of energy without an ecological breakdown (because poor countries cannot afford environmental protection) and without safety hazards (because they are not acquainted with the safety requirements for nuclear power plants) and without a rapid depletion of natural resources at the expense of future generations? The sun! Many of these countries are lavishly provided with solar radiation in their desert areas. We will write a custom essay sample on Solar Updraft Tower or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page This is common knowledge, stated already in Agenda 21 of the Rio-UN-conference, everybody is talking about it, and nobody does anything. Why? Because apparently it must be a well-kept secret that large-scale solar energy utilization is possible today and that it is affordable and competitive! SCIENTIFIC PRINCIPLE INVOLVED The use of three old technologies Man learned to make active use of solar energy at a very early stage: greenhouses helped to grow food, chimney suction ventilated and cooled buildings and windmills ground corn and pumped water. The solar chimneys three essential elements glass roof collector, chimney, and wind turbines have thus been familiar from time immemorial A solar-thermal chimney simply combines them in a new way . Air is heated by solar radiation under a low circular glass roof open at the periphery; this and the natural grounds below it form a hot air collector. Continuous 24 hours-operations is guaranteed by placing tight water-filled tubes under the roof. The water heats up during the daytime and emits its heat at night. These tubes are filled only once, no further water is needed. In the middle of the roof is a vertical chimney with large air inlets at its base. The joint between the roof and the chimney base is airtight. As hot air is lighter then cold air it rises up the chimney. Suction from the chimney then draws in more hot air from the collector, and cold air comes in from the outer perimeter. Thus solar radiation causes a constant updraught in the chimney. The energy this contains is converted into mechanical energy by pressure-staged wind turbines at the base of the chimney, and into electrical energy by conventional generators. A single solar chimney with a suitably large glazed roof area and a high chimney can be designed to generate 100 to 200 MW continuously 24 h a day. Thus even a small number of solar chimneys can replace a large nuclear power station. Solar chimneys operate simply and have a number of other advantages: -The collector can use all solar radiation, both direct and diffused. This is crucial for tropical countries where the sky is frequently overcast. The other major large scale solar-thermal power plants, parabolic through and central receiver systems, which apply concentrators and therefore can use only direct radiation, are at a disadvantage there. Due to the heat storage system the solar chimney will operate 24h on pure solar energy. The water tubes laying under the glass roof absorb part of the radiated energy during the day and release it into the collector at night. Thus solar chimneys produce electricity at night as well. Solar chimneys are particularly reliable and not liable to break down, in comparison with other solar generating plants. Turbines, transmission and generator subject to a steady flow of air are the plants only moving parts. This simple and robust structure guarantees operation that needs little maintenance and of course no combustible fuel. Unlike conventional power stations (and also other solar-thermal power station types), solar chimneys do not need cooling water. This is a key advantage in the many sunny countries that already have major problems with drinking water. The building materials needed for solar chimneys, mainly concrete and glass, are available everywhere in sufficient quantities. In fact, with the energy taken from the solar chimney itself and the stone and sand available in the desert, they can be reproduced on site. Solar chimneys can be built now, even in less industrially developed countries. The industry already available in most countries is entirely adequate for their requirements. No investment in high-tech manufacturing plant is needed. Even in poor countries it is possible to build a large plant without high foreign currency expenditure by using their own resources and work-force; this creates large numbers of jobs and dramatically reduces the capital investment requirement and the cost of generating electricity. Solar chimneys need large collector areas. As economically viable operation of solar electricity production plants is confined to regions with high solar radiation, this is not a fundamental disadvantage, as such regions usually have enormous deserts and unutilized areas. And so land use is not a particularly significant factor, although of course deserts are also complex biotopes that have to be protected. The technology 3. 1. The collector Hot air for the solar chimney is produced by the greenhouse effect in a simple air collector consisting only of a glass or plastic film covering stretched horizontally two to six meters above the ground. The height of the covering increases adjacent to the chimney base, so that the air is diverted to vertical movement with minimum friction loss. This covering admits the short-wave solar radiation component and retains long-wave radiation from the heated ground. Thus the ground under the roof heats up and transfers its heat to the air flowing radially above it from the outside to the chimney. 3. 2. The energy storage Water filled black tubes are laid down side by side on the soil under the glass roof collector. They are filled with water once and remain closed thereafter, so that no evaporation can take place. The volume of water in the tubes is selected to correspond to a water layer with a depth of 5 to 20 cm depending on the desired power output characteristics. 3. 3. The chimney The chimney itself is the plants actual thermal engine. It is a pressure tube with low friction loss (like a hydroelectric pressure tube or penstock) because of its optimal surface- volume ratio. The upthrust of the air heated in the collector is approximately proportional to the air temperature rise DTcoll in the collector and the volume, (i. e. he height Hc multiplied by the diameter Dc) of the chimney. In a large solar chimney the collector raises the temperature of the air by about 35 K. This produces an updraught velocity in the chimney of about 15m/s. It is thus possible to enter into an operating solar chimney plant for maintenance without difficulty. Chimneys 1,000 m high can be built without difficulty. The television tower in Toronto, Canada is almost 600 m high and serious plans are being made for 2, 000 metre skyscrapers in earthquake-ridden Japan. But all that is needed for a solar chimney is a simple, large diameter hollow cylinder, not particularly slender, and subject to very few demands in comparison with inhabited buildings. There are many different ways of building this kind of chimney. They are best built freestanding, in reinforced concrete. But guyed tubes, their skin made of corrugated metal sheet, as well as cable-net designs with cladding or membranes are also possible. All the structural approaches are well known and have been used in cooling towers. No special development is needed. 3. 4. The turbines Using turbines, mechanical output in the form of rotational energy can be derived from the air current in the chimney. Turbines in a solar chimney do not work with staged velocity like a free-running wind energy converter, but as a cased pressure-staged wind turbogenerator, in which, similarly to a hydroelectric power station, static pressure is converted to rotational energy using a cased turbine in this application installed in a pipe. The power output of a cased pressure-staged turbine of this kind is about eight times greater than that of a speed-stepped open-air turbine of the same diameter. Air speed before and after the turbine is about the same . The output achieved is proportional to the product of volume flow and the fall in pressure at the turbine. With a view to maximum energy yield the aim of the turbine regulation system is to maximize this product under all operating conditions. Blade pitch is adjusted during operation to regulate power output according to the altering airspeed and airflow. If the flat sides of the blades are perpendicular to the airflow, the turbine does not turn. If the blades are parallel to the air flow and allow the air to flow through undisturbed there is no drop in pressure at the turbine and no electricity is generated. Between these two extremes there is an optimum blade setting: the output is maximized if the pressure drop at the turbine is about two thirds of the total pressure differential available. 3. 5. A hydroelectric power station for the desert Solar chimneys are technically very similar to hydroelectric power stations so far the only really successful large scale renewable energy source: the collector roof is the equivalent of the reservoir, and the chimney of the penstock. Both power generation systems work with pressure-staged turbines, and both achieve low power production costs because of their extremely long life-span and low running costs. The collector roof and reservoir areas required are also comparable in size for the same electrical output. But the collector roof can be built in arid deserts and removed without any difficulty, whereas useful (often even populated) land is submerged under reservoirs. Solar chimneys work on dry air and can be operated without the corrosion and cavitation typically caused by water. They will soon be just as successful as hydroelectric power stations. Electricity yielded by a solar chimney is in proportion to the intensity of global solar radiation, collector area and chimney height. Optimum dimensions can be calculated only by including specific component costs (collector, chimney, turbines) for individual sites. And so plants of different sizes are built from site to site but always at optimum cost: if glass is cheap and concrete expensive then the collector will be large with a high proportion of double glazing and a relatively low chimney, and if glass is expensive there will be a smaller, largely single-glazed collector and a tall chimney. THE PROTOTYPE IN MANZANARES Detailed theoretical preliminary research and a wide range of wind tunnel experiments led to the establishment of an experimental plant with a peak output of 50 kW on a site made available by the Spanish utility Union Electrica Fenosa in Manzanares (about 150km south of Madrid) in 1981/82, with funds provided by the German Ministry of Research and Technology (BMFT). The aim of this research project was to verify, through field measurements, the performance projected from calculations based on theory, and to examine the influence of individual components on the plants output and efficiency under realistic engineering and meteorological conditions. To this end a chimney 195 m high and 10 m in diameter was built, surrounded by a collector 240 m in diameter. The plant was equipped with extensive measurement data acquisition facilities. The performance of the plant was registered second by second by 180 sensors. Since the type of collector roof primarily determines a solar chimneys performance costs, different building methods and materials for the collector roof were also to be tested in Manzanares. A realistic collector roof for large-scale plants has to be built 2 to 6 metres above ground level. For this reason the lowest realistic height for a collector roof for large-scale technical use, 2 metres, was selected for the small Manzanares plant. (For output, a roof height of 50 cm only would in fact have been ideal. Thus only 50 kW could be achieved in Manzanares, but this realistic roof height also permitted convenient access to the turbine at the base of the chimney. This also meant that experimental planting could be carried out under the roof to investigate additional use of the collector as a greenhouse. The experimental plant in Manzanares operated for about 15,000 hours from 1982 onwards. The following tests were run in the course of the project: In 1986 the structural improvement wo rk that made occasional operational interruptions necessary was completed. After that, from mid 1986 to early 1989 it was possible to run the plant on a regular daily basis, except for a period of four months which was set aside for special measurements and specific modifications. During this 32 month period, the plant ran, fully automatically, an average of 8. 9 hours per day for a total of 8611 operating hours. One person at the most was needed for supervision. Thus there is no doubt that solar chimneys can be built, run in the long term and reliably maintained even in countries that are technologically less developed. During the 32 month period, plant reliability was over 95 %. Sporadic storm damage to the old plastic film area of the collector was repaired without switching off the plant. The 5 per cent non-operational period was due to automatic plant switch-off at the weekend when the Spanish grid occasionally failed. DESIGNING LARGE SOLAR CHIMNEYS Measurements taken from the experimental plant in Manzanares and solar chimney thermodynamic behaviour simulation programs were used to design large plants with outputs of 200 MW and more. Detailed investigations, supported by extensive wind tunnel experiments, showed that thermodynamic calculations for collector, tower and turbine were very reliable for large plants as well. Despite considerable area and volume differences between the Manzanares pilot plant and a projected 100 MW facility, the key thermodynamic factors are of similar size in both cases. Using the temperature rise and wind speed in the collector as examples, the measured temperature rise at Manzanares was up to 17 K and the wind speed up to 12 etres per second, while the corresponding calculated figures for a 100 MW facility are 35 K and 16 metres per second. FINANCIAL FEASIBILITY This section discusses only the simplest, classical design of a solar updraft tower power plant, and variations are not considered. A solar updraft power station would require a large initial capital outlay, but would have relatively low operating cost. However, the capital outlay required is roughly the same as next-generati on nuclear plants such as the AP-1000 at roughly $5 per W of capacity. Like other renewable power sources there would be no cost for fuel. The cost per energy is largely determined by interest rates and years of operation, varying from 5 eurocent per kWh for 4% and 20 years to 15 eurocent per kWh for 12% and 40 years. A disadvantage of a solar updraft tower is the much lower conversion efficiency than concentrating solar power stations have, thus requiring a larger collector area and leading to higher cost of construction and maintenance. Financial comparisons between solar updraft towers and concentrating solar technologies contrast a larger, simpler structure against a smaller, more complex structure. The better of the two methods is the subject of much speculation and debate. A solar tower is expected to have less of a requirement for standby capacity from traditional energy sources than wind power does. Various types of thermal storage mechanisms (such as heat-absorbing surface material or salt water ponds) could be incorporated to smooth out power yields over the day/night cycle. Most renewable power systems (wind, solar-electrical) are variable, and a typical national electrical grid requires a combination of base, variable and on-demand power sources for stability. However, since distributed generation by intermittent power sources provides smoothing of the rate of change, this issue of variability can also be addressed by a large interconnected electrical super grid, incorporating wind farms, hydroelectric, and solar power stations. There is still a great amount of uncertainty and debate on what the cost of production for electricity would be for a solar updraft tower and whether a tower (large or small) can be made profitable. Schlaich et al. stimate a cost of electricity between 7 (for a 200 MW plant) and 21 (for a 5 MW plant) euro cents per kWh, but other estimates indicate that the electricity cannot possibly be cheaper than 25-35 cents per kWh. Compare this to LECs of approximately 3 Euro cents per KWh for a 100 MW wind or natural gas plant. No reliable electricity cost figures will exist until such time as actual data are available on a utility scale power plant, since cost predictions for a time scale of 25 years or more are unreliable. Energy Production Costs With the support of construction companies, the glass industry and turbine manufacturers a rather exact cost estimate for a 200 MW solar chimney could be compiled. We asked a big utility Energie Baden-Wurttemberg (formerly EVS/BW) to determine the energy production costs compared to coal- and combined cycle power plants based on equal and common methods. Table 1: Comparison between the energy production costs of a solar chimney (2 solar chimneys with 200 MW each) and 400 MW coal and combined cycle power plants according to the present business managerial calculations. Purely under commercial aspects with a gross interest rate of about 11 % and a construction period of 4 years during which the investment costs increase already by 30 %(! ) Electricity from solar chimneys is merely 20 % more expensive than that from coal. In case of the solar chimney the interest on the fix investment governs the price of electricity, whereas in the case of fossil fuel power plants the variable fuel costs are the deciding factor. By just reducing the interest rate to 8 % electricity from solar chimneys would become competitive today. In low-wage-countries the costs will decrease further especially those of the glass roof collector which alone amounts to 50 % of the overall costs. On the other hand there are a number of advantages: 1)No ecological harm and no consumption of resources, not even for the construction. Solar chimneys predominantly consist of concrete and glass which are made from sand and stone plus self-generated energy. Consequently in desert areas with inexhaustible sand and stone solar chimneys can reproduce themselves. A truly sustainable source of energy! )The (high) investment costs are almost exclusively due to labour costs. This creates jobs, and a high net product for the country with increased tax income and reduced social costs (= human dignity, social harmony), and in addition no costly imports of coal, oil, gas which is especially beneficial for the developing countries releasing means for their development. We have no choice but to do something for the energy consent, the environment and above all for the billions of underprivileged people in the Third World. But we should not offer them hand-outs, a multiple of which we deceitfully regain by imposing a high interest rate on their debt. Instead we should opt for global job sharing. If we buy solar energy form Third World countries, they can afford our products. A global energy market with large scale solar energy generation supplementing substantially hydropower, fossil and nuclear fuels is not an utopian dream! Therefore, now it is absolutely essential to build and operate a large solar chimney.