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» Browse Science and Environment Term Papers
An Experiment In Edge Damage
Number of Words: 983 / Number of Pages: 4
... unknown; however, it
was a very hard wood and a light brown/tan color.
Initially, medium pressure was used on the flake and it was moved
in bi-directional strokes across the stick. After about thirty strokes,
the use edge angle prohibited the flake from cutting further in to the
stick. The cut was roughly three millimeters deep and three quarters
millimeters wide. It could be determined that a tool, in this particular
shape, could not be used as an effective saw. However, use-wear patterns
could still be inferred. The flake was moved to another portion of the
stick and the same process wa ...
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Solar Energy: An Alternative Energy
Number of Words: 290 / Number of Pages: 2
... energy
produced in the sun as a result of a constant nuclear fusion reaction that is
taking place. The amount of energy at the solar constant, which is at outer edge
of the earth's atmosphere, is two calories per minute per cm squared. A calorie
is the amount of energy needed to raise one gram of water one degree Celsius.
If we could efficiently harness the energy bombarding the earth for twenty-four
hours we could power New York for a year. Unfortunately the photovoltaic cells
that change the energy into electricity are so inefficient that it would take
twenty-five years to pay for it's self i ...
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Mental Illness
Number of Words: 1114 / Number of Pages: 5
... and Chinese civilizations have also shown evidence that was believed to be a possession by demons-using beatings, restraint, and starvation to try to drive out the evil spirits.
These beliefs somewhat cooled down as time continued to move on, but once again popped up as America was starting to be formed. In 1692 and 1693 the Salem witchcraft trials began. At this point in time was suggested to be associated with the devil, so those with es were thought to be witches. Those who were thought to be witches were given unfair trials and quick death penalties. Many innocent people who simply h ...
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Klinefelter Syndrome
Number of Words: 912 / Number of Pages: 4
... a variation will result in a male with an extra X. This is and is often written as 47,XXY. There are other, less common variations such as 48,XXYY; 48,XXXY; 49,XXXXY; and XY/XXY mosaic. All of these are considered variants.
The major effect of the extra X chromosome in boys with seems to be the function of the testes. The testes produce the major male sex hormone testosterone and the amount of this hormone may be decreased in boys with . When these boys reach 10-12 years of age, it is helpful to measure their blood hormone levels periodically (e.g., yearly) to see if they are normal. If t ...
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El Nino
Number of Words: 1143 / Number of Pages: 5
... Nino year, upwelling
is suppressed and as a result, the thermocline is lower than normal. Finally,
thermocline rises in the west, making upwelling easier and water colder. Air
pressures at sea level in the South Pacific seesaw back and forth between two
distinct patterns. In the high index phase, also called "Southern Oscillation",
pressure is higher near and to the east of Tahiti than farther to the west near
Darwin. The east-west pressure difference along the equator causes the surface
air to flow westward. When the atmosphere switches into the low index phase,
barometers rise in the west and fall ...
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The Big Bang
Number of Words: 1282 / Number of Pages: 5
... in the past, nor will there be change in the
future. This model assumes the perfect cosmological principle. This principle
says that the universe is the same everywhere on the large scale, at all times.2
It maintains the same average density of matter forever.
There are observational evidences found that can prove the Big Bang model
is more reasonable than the Steady State model. First, the redshifts of distant
galaxies. Redshift is a Doppler effect which states that if a galaxy is moving
away, the spectral line of that galaxy observed will have a shift to the red end.
The faster the gal ...
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Atm Network
Number of Words: 2013 / Number of Pages: 8
... (PCM) allowed digital communications to be developed in the late 1960's. The interconnection of computer systems over telecommunication networks soon became a requirement. Modems were used at first to generate analogue signals compatible with the PSTNs from the digital computer data to allow such interconnections. The already wide spread use of the PSTNs was an advantage of this scheme, however it was soon recognized as not being an optimum solution for data transfer.
The analogue PSTNs were unsuitable in terms of switching, capacity (bandwidth) and channel noise. In data communication applications, ...
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Clinical Depression 2
Number of Words: 599 / Number of Pages: 3
... too few messages get transmitted between neurons and the symptoms of depression occur. In Clinical depression the chemicals in the brain are out-of-balance. New technology allows researchers to take pictures of the brain that show activity levels in the brain. These imaging techniques such as f-MRI and PET scan actually create images of how active different parts of the brain are. Some studies with these kinds of techniques have suggested that the patterns of activation in the brains of depressed people are different than those who are not. These tests can help doctors and researchers learn more abo ...
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Anti-Matter
Number of Words: 1209 / Number of Pages: 5
... makes no difference.
Scientists at CERN in Geneva are working on a device called the LEAR
(low energy anti-proton ring) in an attempt to slow the velocity of the
anti-protons to a billionth of their normal speeds. The slowing of the
anti-protons and positrons, which normally travel at a velocity of that
near the speed of light, is neccesary so that they have a chance of meeting
and combining into anti-hydrogen.
The problems with research in the field of anti-matter is that when
the anti-matter elements touch matter elements they annihilate each other.
The total combined mass of both eleme ...
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Hemp
Number of Words: 2153 / Number of Pages: 8
... one fell swoop . . . with one
simple plant. It is ignorance and the maintenance of the status quo that has
blinded and crippled our ability to realize this resource.
INTRODUCTION
A plant exists that is so strong that it can be grown without requiring
chemicals in almost every part of the world. Many have touted this plant as a
possible way in which to wean society from its dependence on fossil fuels for
energy and the need to log forests for pulp, paper and wood. It is even said
that this plant could adequately clothe and feed the world more efficiently and
cheaply than we can do now!
Why is th ...
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