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» Science Essays and Papers
Analysis Of A Vapor Power Plant
<view this essay>.... liquid condensate
being pumped ahead into the boiler feedwater line. The Terminal Temperature
Difference of the feedwater heater is 5°C. The rest of the steam is reheated to
500°C, and then enters the second stage of expansion. Part of the steam is
extracted between the second and third stages at P2 and fed into an open
feedwater heater operating at that pressure. Saturated liquid at P2 leaves the
open feedwater heater. The efficiencies of all pumps are 80%, and the
efficiencies of all turbines are 85%.
Throughout this report the states will be referenced as depicted above with the
numbers 1-13. The analysis of the system will involve the use of the Energy Ra .....
Number of words: 1672 | Number of pages: 7 |
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Anti-Matter
<view this essay>.... so, the antiproton's negative
mass/energy would cancel the proton's when they met and nothing would
remain; in reality, two extremely high-energy gamma photons are
produced. Today's theories of the universe say that there is no such
thing as a negative mass.
The second and more subtle mistake is the idea that anti-water
would only annihilate with ordinary water, and could safety be kept in
(say) an iron container. This is not so: it is the subatomic
particles that react so destructively, and their arrangement makes no
difference.
Scientists at CERN in Geneva are working on a device called the
LEAR (low ener .....
Number of words: 1226 | Number of pages: 5 |
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Chemistry Solution
<view this essay>.... fluids, and brass are also solution. A solution is a homogenous mixture of two or more substances in a single physical state. Solutions are all around you.
All solutions share several important properties. The particles in a solution are very small. In fact, they are atoms, molecules, or ions, which is why you cannot see them. The particles in a solution are evenly disturbed, or intermingled informally on a molecular level. A small sample of one part of a solution. The particles in a solution will not separate no matter how long the solution is allowed to stand under constant conditions. In a solution, one substance is usually considered to be dissolved .....
Number of words: 543 | Number of pages: 2 |
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The Critical Role Of Informati
<view this essay>.... and society (Laudon 5).
Since the emergence of the global economy, the success of firms today and in the future depends on their ability to operate globally. The American economy depends on imports and exports. Foreign trade, both imports and exports accounts for a little over 25 percent of goods and services produced in the United States, and even more in countries like Japan and Germany. This percentage is currently and will continue to grow in the future (5).
Globalization of the world’s industrial economies greatly enhances the value of information to the firm and offers new opportunities to businesses. Today, information systems provide the communic .....
Number of words: 1717 | Number of pages: 7 |
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An Experiment In Edge Damage
<view this essay>.... decide if use-wear analysis is indicative of the function of
past tools.
A small obsidian flake would be used in this experiment. It was
approximately forty-eight millimeters long, thirty-four millimeters wide,
and seven millimeters thick. From the ventral view, the left side was
serrated. This seemed like the most appropriate side to use as a saw. A
small round twig, a centimeter thick, from a local deciduous tree was used
as the wood subject. The exact species of the tree is 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 strok .....
Number of words: 983 | Number of pages: 4 |
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Nuclear Fusion
<view this essay>.... material fuel needed for fusion is rather low. For example 10 grams of Deuterium (which can be extracted from 500 liters of water) and 15g of Tritium (produced from 30g of Lithium) would produce enough fuel for the lifetime electricity needs of an average person in an industrialized country. (Environmental Organizations, Source 4)
The problems with fusion have been numerous. One of the problems is attaining the correct temperature for fusion to take place without using more energy then you produce. Fusion reactions occur at a sufficient rate only at very high temperatures. Over 100 million degrees Celsius is needed for the Deuterium-Tritium reaction, while ot .....
Number of words: 886 | Number of pages: 4 |
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Electronic Stimulation
<view this essay>.... in one particular field of
Medicine, electric stimulation. Electric stimulation is the application of electric current in treatment without the generation of intense heat. This includes electric stimulation of nerves or muscles, passage of current into the body, or use of interrupted current of low intensity to raise the threshold of the skin to pain.
Studies suggested this therapy is applied to conditions such as ulcers, traumatic or burn wounds, osteoarthritis, and cancer. Electrical stimulation is simply the application of electrical pulses to the body, whether it is for function or therapy. The classical and common example is that of the cardiac pacema .....
Number of words: 640 | Number of pages: 3 |
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Cell Division
<view this essay>.... DNA and the replication of chromosomes occur in the S phase, and final preparations for occur in the G2 phase. Actual occurs in M phase (mitosis). Mitosis has four sub-phases, prophase, metaphase, anaphase, and telophase. In prophase, the nucleoli disappears and the chromatin fibers become discrete chromosomes. The mitotic spindle also beings to form and the centrioles begin to move towards opposite ends of the cell. Also occurring later in prophase, the nuclear envelope fragments, and the microtubles attach to the kinetochores and overlap. In Metaphase, the chromosomes line up along the metaphase plate. The centromeres are all aligned and the sister c .....
Number of words: 395 | Number of pages: 2 |
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