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Search results 3771 - 3780 of 12257 matching essays
- 3771: Nuclear Power
- ... large number of batch operations in series. Column operations become more practical. In many waste solutions, the radioactive ions are cations and a single column or series of columns of cation exchanger will provide decontamination. High capacity organic resins are often used because of their good flow rate and rapid rate of exchange. Monobed or mixed bed columns contain cation and anion exchangers in the same vessel. Synthetic organic resins, of ... evaporate off the bulk of the waste to obtain a small concentrated volume. The aim is to develop more efficient types of evaporators. At the same time the decontamination factors obtained in evaporation must be high to ensure that the activity of the condensate is negligible, though there remains the problem of accidental dispersion. Much effort is current in many countries on the establishment of the ultimate disposal methods. These are ... the absorbtion of montmorillonite clay' which is comprised of natural clays that have a good capacity for chemical exchange of cations and can store radioactive wastes, 'fused salt calcination' which will neutralize the wastes and 'high temperature processing'. Even though man has made many breakthroughs in the processing, storage and disintegration of radioactive wastes, there is still much work ahead to render the wastes absolutely harmless.
- 3772: Aristotle
- ... felt should be heartily sought after. Aristotle felt that everyone should possess these qualities, and they were crucial for a good ruler. Wisdom, courage, temperance and justice were the four virtues that Aristotle held so high. He felt that only through these four qualities could lead a person or a country to true happiness. Aristotle's virtues parallel the thinking of other classical Greeks. One of the obvious reasons for this ... the importance of moral virtues as the key to happiness and a successful government. Aristotle thought that the need for government and authority developed on its own from nature. He taught in the Lyceum, a school he founded in Athens, how a just person should live and how a just state should rule. His messages of virtue and moderation transcend time and still are a great influence on modern western thought ...
- 3773: Andrew Jackson
- ... Waxhaw Presbyterian Church because he wanted to be a minister. Later on, he started to study law and became a lawyer and a landowner. he was a general in the War of 1812. He graduated high school from Waxhaw Presbyterian Church and is believed to have gone to college. He got married to Mrs. Rachael Donelson Robards, a dark eyed, dark haired woman. They did not have any children together. So they ...
- 3774: Analysis Of Karl Marx And Comm
- ... heart, not even learning to speak the language properly. Shortly before Karl Marx was born, his father converted the family to the Evangelical Established Church, Karl being baptized at the age of six. Marx attended high school in his home town (1830-1835) where several teachers and pupils were under suspicion of harboring liberal ideals. Marx himself seemed to be a devoted Christian with a "longing for self-sacrifice on behalf of ...
- 3775: Acid Rain: Cause and Effects and Issues
- ... The effect of the Acid or excessive Base on the plant and animal life: You will probably find that there aren't many aquatic living organisms in waters that are excessively basic or acidic. A high acidic or basic content in lakes kill fishes and other aquatic species. Prolonged exposure to acidic or excessively basic conditions can lead to reproductive failure and morphological aberration of fish. A lowered pH tends to ... Lakes are exposed to hazardous chemicals. They drink them in the contaminated water, eat them concentrated in the flesh of the fish and breathe them in the air. Mulroney said that the risks are too high and that we cannot afford any more risks. He said pollution problems could be fought under a three-stage plan over the next decade: 1) A "toxic freeze" banning new polluters from putting up pipes ... is effective, three gallons of water for every good one produced is generally wasted. Some machines zap germs with lethal doses of ultraviolet light. A specific example of a water filter is the NSA 3000HM high density filter. This filtration unit is designed to remove lead, iron, sulfur and manganese from your drinking water supply. Still another example is a water treatment system called the NSA Bateriostatic water treatment system. ...
- 3776: Solar Cells
- ... this, electrons in the valence band can easily be made to jump to the conduction band by the injection of energy, either in the form of heat or light [Book 4]. This explains why the high resistivity of semiconductors decreases as the temperature is raised or the material illuminated. The excitation of valence electrons to the conduction band is best accomplished when the semiconductor is in the crystalline state, i.e. when the atoms are arranged in a precise geometrical formation or "lattice". At room temperature and low illumination, pure or so-called "intrinsic" semiconductors have a high resistivity. But the resistivity can be greatly reduced by "doping", i.e. introducing a very small amount of impurity, of the order of one in a million atoms. There are 2 kinds of dopant. Those ... radiation of a particular spectral composition is directly proportional to the irradiance [Book 2]. Some types of solar cell, however, do not exhibit this linear relationship. The silicon solar cell has many advantages such as high reliability, photovoltaic power plants can be put up easily and quickly, photovoltaic power plants are quite modular and can respond to sudden changes in solar input which occur when clouds pass by. However there ...
- 3777: Solar Energy - The Energy Of The Future?
- ... enough energy for activities such as washing and bathing. The solar panels generate "low grade" heat, that is, they generate low temperatures for the amount of heat needed in a day. In order to generate "high grade" heat, intense enough to convert water into high-pressure steam which can then be used to turn electric generators there must be another method. The concentrated beams of sunlight are collected in a device called a solar furnace, which acts on the same ... the light into a very small area. Very elaborate solar furnaces have machines that angle the mirrors and lenses to the sun all day. This system can provide sizeable amounts of electricity and create extremely high temperatures of over 6000 degrees Fahrenheit. Solar energy generators are very clean, little waste is emitted from the generators into the environment. The use of coal, oil and gasoline is a constant drain, economically ...
- 3778: Nuclear Power
- ... large number of batch operations in series. Column operations become more practical. In many waste solutions, the radioactive ions are cations and a single column or series of columns of cation exchanger will provide decontamination. High capacity organic resins are often used because of their good flow rate and rapid rate of exchange. Monobed or mixed bed columns contain cation and anion exchangers in the same vessel. Synthetic organic resins, of ... evaporate off the bulk of the waste to obtain a small concentrated volume. The aim is to develop more efficient types of evaporators. At the same time the decontamination factors obtained in evaporation must be high to ensure that the activity of the condensate is negligible, though there remains the problem of accidental dispersion. Much effort is current in many countries on the establishment of the ultimate disposal methods. These are ... the absorbtion of montmorillonite clay' which is comprised of natural clays that have a good capacity for chemical exchange of cations and can store radioactive wastes, 'fused salt calcination' which will neutralize the wastes and 'high temperature processing'. Even though man has made many breakthroughs in the processing, storage and disintegration of radioactive wastes, there is still much work ahead to render the wastes absolutely harmless.
- 3779: Current Status of Malaria Vaccinology
- ... of the major surface molecule, the circumsporozoite (CS) protein. Monoclonal CS antibodies given prior to sporozoite challenge have achieved passive protection in animals. Immunization with irradiated sporozoites has produced protection associated with the development of high levels of polyclonal CS antibodies which have been shown to inhibit sporozoite invasion of human hepatoma cells. Despite such encouraging animal and in vitro data, evidence linking protective immunity in humans to levels of CS ... in vaccinee malaria cases than in non-cases, 3 and 5 months after the third dose of vaccine. Because antibody levels had fallen substantially before peak malaria transmission occurred, the question of whether or not high levels of CS antibody are protective still remains to be seen. So at the end we are once again left without conclusive evidence, but are now even closer to creating the sought after malaria vaccine ... it is obvious that malaria is proving a difficult disease to establish an effective and cheap vaccine for in that some tests and inconclusive and others while they seem to work do not reach a high enough standard. But having said that I hope that a viable vaccine will present itself in the near future (with a little help from the scientific world of course). Word Count: 2,223
- 3780: Dangers and Destructions of Floods and Hurricanes
- ... by tidal waves and coastal currents. Coastal floods can cover a large amount of distance along a shore. The length of time a coastal flood is dangerous is usually very short. It depends on how high the tide is which goes up and down twice a day. When the velocities of hurricane winds become severe the height of the waves become three or more feet higher than the previous high tide. Coastal floods can be caused by a number of things. Coastal floods can be caused by runoff, hurricane waves, tsunami (seismic sea waves), and hurricane rains. Coastal flooding can not only take part on ... areas. In the United States in the early 1990's 50% of the population was on a coastal county.1 Although they shrink before reaching shore, wind generated waves have been spotted to be as high as 30 m (100 ft) in the middle of the ocean.2 In 1970 a major storm in the Bay of Bengal produced heavy seas that flooded regions of East Pakistan, killing about 200, ...
Search results 3771 - 3780 of 12257 matching essays
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