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» Browse Science and Environment Term Papers
Diamonds
Number of Words: 477 / Number of Pages: 2
... atomic structure of the diamond crystal. A pure Diamond , which would be 100% carbon, is colorless
were created million years ago, when the earth was formed, the material experienced pressure of 5million times the atmosphere at sea level and temperatures between 1000~1200degreesC. These conditions caused carbon in the layers inside the planet to crystallize into . The moved up to the earth’s surface through volcano eruptions. This is why many Diamond mines are near volcanoes. occur in two types of rock: Kimberlite and Lamprolite. are mostly found in South Africa, India, Brazil, Russia, Australia, ...
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Development Of Operating Systems
Number of Words: 1757 / Number of Pages: 7
... was specifically assembled to carry out a particular calculation.
These early computers had no need for an operating system and were operated directly from the operator's console by a computer programmer, who had immediate knowledge of the computers design.
By the early 1950's punched cards were introduced, allowing programs to be written and read directly from the card, instead of using plugboards.
Second Generation Computers (1955-1965)
In the mid-1950's, the transistor was introduced, creating a more reliable computer. Computers were used primarily for scientific and engineering calcula ...
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Attention Deficit Disorder ( Add)
Number of Words: 1447 / Number of Pages: 6
... in social relationships.
„h Difficulty in waiting turns, interrupting or intruding on conversations/games.
Examples of hyperactivity will be seen through the child often fidgeting or squirming in their seats. The will be described as being "on the go" or acting as if "driven by a motor".
Many other symptoms like quick shifts of moods temper outbursts, and problems with getting along with others also occur often. Unfortunately, most of the disorders features are negative. Children with ADD can often concentrate and behave more appropriately in small groups with few distractions in the situation. Thei ...
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Plutonium
Number of Words: 835 / Number of Pages: 4
... the nuclei in atoms of deuterium, transmuting it into plutonium.
Shortly after, Seaborg was able to isolate plutonium 239, an isotope used in
atomic bombs.
Plutonium is a highly dangerous and poisonous element because it rapidly
gives off radiation in the form of alpha particles. Alpha particles, which are
identical to the nucleus of a helium atom, consist of two protons and two
neutrons tightly bound together. Although the particles can only travel about
five centimeters in the air, they can cause great damage when the enter the body,
causing cancer and other serious health problems. Beyond the ...
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E.r., The Golgi Body And
Number of Words: 1185 / Number of Pages: 5
... compartments within the cytoplasm. The internal space formed by the membrane sheets is known as the ER lumen. In most cells the ER lumen forms a single internal compartment. The membranes of other organelles are not connected to the ER and appear to form separate distinct compartments within the cytoplasm.
The ER membranes and lumen contain a large number and variety of enzymes which catalyse many different types of chemical reactions. In some cases the membranes serve as a framework for systems of enzymes that carry out sequential biochemical reactions. Other ER enzymes are located within t ...
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Cryogenics And The Future
Number of Words: 1237 / Number of Pages: 5
... the temperature of a gas is expanded without adding or extracting heat from the gas or the surrounding system"(Vance 26). At the same time Pictet used the "Joule-Thompson Effect," a thermodynamic process that states that the "temperature of a fluid is reduced in a process involving expansion below a certain temperature and pressure"(McClintock 4). After Cailletet and Pictet, a third method, known as cascading, was developed by Karol S. Olszewski and Zygmut von Wroblewski in Poland. At this point in history Oxygen was now able to be liquefied at 90 K, then soon after liquid Nitrogen was obtained at ...
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The Aftermath Of Hurricane Mitch
Number of Words: 382 / Number of Pages: 2
... swam to freedom as Mitch's floodwaters rose and propelled them
over the walls. Hundreds of homes, streets, and businesses were washed away,
and those that remained standing found themselves anchored beneath several
feet of mud and debris.
In some places, the stench is overpowering. The smell from
intermingled garbage, rotting food, rancid floodwater, animal and -- very
possibly -- human corpses fills the air. Yet still people work near the
water, clean goods in it, even bathe in it. The potential for disease
cannot be understated.
Homeowners squat along the muddy, contaminat ...
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The Cosmos: Creation
Number of Words: 602 / Number of Pages: 3
... as a whole. Modern equipment has observed and
verified this so-called Hubble expansion exists throughout the observable
universe.
This shows three important things. First there is no significance to the
fact that earth seems to be the center of the universal expansion. In any
galaxy it would look as if you were standing still and all others were rushing
away from you. Second the movement of the universe is not like an explosion.
Galaxies are not moved through the universe but expand with the universe. Third
the galaxies themselves do not expand only the space between them.
Finally if you ...
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Abstract From: Cloning : Where Do We Draw The Line?
Number of Words: 771 / Number of Pages: 3
... the equivalent of a mother
producing twins. The process has been practiced and almost perfected in
livestock for the past ten years, and some scientists believe that it seems only
logical that it would be the next step in in-vitro fertilization. The procedure
was remarkably simple. Hall and Stillman "selected embryos that were abnormal
because they came from eggs that had been fertilized by more than one sperm"
(Elmer-Dewitt 38), because the embryos were defective, it would have been
impossible for the scientist to actually clone another person. They did however,
split the embryos into separate cel ...
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Biological Effects Of Radiation
Number of Words: 610 / Number of Pages: 3
... If enough atoms are affected in such a way that the chromosomes do not replicate properly, or there is a significant alteration in the information carried by the DNA molecule, then the cell may be destroyed by “direct” interference with its life-sustaining system.
Indirect effects are caused by the reaction of radiation with the water that makes up the majority of the cells volume. When radiation interacts with water, it may break the bonds that hold the water molecule together. This produces fragments of hydrogen and hydroxyls. These fragments may recombine or they may interact with other fra ...
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