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Search results 3711 - 3720 of 12257 matching essays
- 3711: Cloud Formations
- ... observed by people, many centuries before our time. People were always fond of clouds. They always wondered why some clouds were dark and others were white and fluffy, and why some clouds are so up high and others were so low that they looked reachable by the human hands. The most recent classification of clouds was accomplished by the World Meteorological Organization in 1956. This organization lists 10 basic kinds of clouds that are subdivided into species according to their outer shape and inner structure. In addition, cloud varieties are discussed according to arrangement and transparency. There is a height classification which are called high, middle, and low altitudes. The different kinds of clouds are found in these three divisions according to the clouds' altitude. First, we have the high clouds that range in altitude from 16,500 to 45,000 feet. In this division we have the cirrus, cirrocumulus, and cirrostratus clouds. A cirrus cloud appears in delicate, feather-like bands that are ...
- 3712: 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 ...
- 3713: Botany and Botanists
- ... Bachelor's degree is the minimum education required for most jobs, because the job of botanist is almost entirely research oriented. To prepare for a job in botany, you should take the following courses in high school: English, foreign language, mathematics, chemistry, physics, and, of course, biology! Courses in social studies are also recommended since botanists often get involved with other people, both locally and nationally. One can also take up hobbies ...
- 3714: Creationism and Darwinism
- ... s zealous agnosticism might turn the trial into a broadside attack on religion. Scopes (skops), John Thomas 1900-1970 American teacher who violated a state law by teaching the theory of evolution in a Tennessee high school. His trial (July 1925) was a highly publicized confrontation between defense attorney Clarence Darrow and the director of the prosecution William Jennings Bryan. Scopes was found guilty and fined a nominal sum, but his conviction ...
- 3715: The Effects of Hurricane Gilbert
- ... then moistened by evaporation" (Sheets 2). Hurricane conditions can only happen during warm months and over warm waters. Storm surges only occur when the storm meets the land. Gilbert's system of low pressure and high winds created a dome of high and intense water that was forced ashore. The water flow then caused storm surges which flooded many low lying areas, such as, beaches and coastlines. The waves of the waters reached as high as 30 feet. Floods were another cause of destruction. Torrential rains created sudden flooding as Hurricane Gilbert moved inland. As Gilbert's winds diminished, rainfall floods became Jamaica's greatest threat. (Sheets 2). Air ...
- 3716: Should The Government Of Canad
- ... I just believe it should be trying to help its people become more independent, instead of 100% dependant on its government. For almost sixty years the Swedish economy was looked upon and admired for its high standard of living. Everything, you name it, they had it. They had a system called cradle-to-grave welfare system, and it promised almost everybody employment. Everybody was guaranteed a free post secondary education and ... had pampered its people so much, Swedes soon became dependant on its government and not on themselves. Four out of ten workers were employed by the government, workers not being present for work were very high, low productivity was being experienced in the export industries, vacations and other allowance benefits were very costly, economic slumps was reducing the base tax the social programs needed to pay for and the government deficit was increasing. In the end, when the government tried to reduce, the government spending Swedes weren't able to deal with their new given independence, and sure enough, high unemployment became one of many of their problems. Looking at Sweden as a case study, I think that is enough to discourage the Canadian government from increasing the proportion of salaries given to income ...
- 3717: Flooding
- ... temperatures are rising consistent with the buildup of greenhouse gases. The warming is not uniform: the eastern United States has actually cooled slightly because it is beneath a cloud of sulfates resulting from combustion of high-sulfur coal. Moreover, satellite observations show that temperatures in the middle of the troposphere have stayed constant at roughly 4 degrees C. But the surface of the earth is warming, he stated, and continued warming ... sea level rise affects birds in their many activities: breeding, foraging and migrating. An increase in the water level brings more competition among species as they fight for dwindling space. It leads to flooding at high tide, killing nesting species. If beaches are eliminated, so is the egg-laying of horseshoe crabs, the food base of many birds. Sea level rise and the overfishing of horseshoe crabs could thus cause large ... wall to keep water from coming over the sea wall. The city tore down its town hall and elevated it. Nine underground pumping stations (costing $1 million) were installed for greater than 25-year storms. High dunes have been built and beaches have been filled five times, at a cost of $1.5 million a shot. Works Cited: From Climate Alert Volume 10, No. 5 November 1997 New Jersey Meeting ...
- 3718: Global Warming
Fact or Fiction?
- Global Warming
Fact or Fiction? Mayfield High School Abstract This project is a compilation of data gathered via many sources: The EPA, Andre Bernier- Meteorologist, S&EPP and many other environmental organizations. The paper will attempt to show that global warming is not ...
- 3719: Green Fluorescent Protein Purification
- ... photon, deprotonates to form a phenolate which then emits a photon (at 509 nm) and gets protonated again so the fluorophore returns to its original state. This cycle allows the fluorophore to reliably emit a high yield of light with no outside influence other than the incoming photon. So GFP is basically a stable little (27-30 kD) green light bulb that can be tacked on to other proteins at either ... the column. Finally, the protein is eluted from the column and collected. We used a cobalt-IMAC resin for the affinity column, solubilization buffer for three initial washes, and 10 mM imidazole for two subsequent high stringency washes. Other students used nickel-IMAC resin and a pH 7.0 high stringency wash. We eluted the protein from the column with elution buffer and collected the liquid in three 1.5 mL aliquots. Week 3: We analyzed all of the aliquots from the isolation scheme ...
- 3720: Genetic Engineering: A Leap In To The Future Or A Leap Towards Destruction
- ... natural counterparts" (Davis and Rouche 70). In fact the RAC reports that "there has not been a single case of illness or harm caused by recombinant [engineered] bacteria, and they now are used safely in high school experiments" (Davis and Rouche 69). Scientists have also devised other methods of preventing bacteria from escaping their labs, such as modifying the bacteria so that it will die if it is removed from the laboratory ...
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