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Search results 20551 - 20560 of 30573 matching essays
- 20551: Nuclear Legacy
- ... from radiation include, radiation therapy for cancer patients. Not all uses of radiation prove to be beneficial. Many use the power of the atom for destructive purposes, introducing an age of nuclear warfare. It doesn't matter if we use radiation for good or bad purposes, they all contribute to the growing rate of "unwanted nuclear waste." The issue now is, how do we dispose of these nuclear wastes? Scientist have ... three were chosen to be the "most suitable" for the disposal of nuclear by-products. These three sites consisted of Hanford, Washington; Yuka Mountain, Nevada; and Defsmith, Texas. Hanford, Washington is a low populated U.S. city, and is owned by the Department of Energy. A low populated city is an ideal site for radioactive disposal. Although the city of Hanford is sparsely populated, geologists fear the possibility of a nuclear seepage into the Colombia river. The Columbia River is an important factor for the U.S. production of wheat. "This makes it the worst of site," says the geologist. If the Colombia River is contaminated with nuclear waste, it will lead to the contamination of land surrounding the large body ...
- 20552: Defense Of Slavery
- ... involved, often thought these acts of inhumanity to be reprehensible, but the parties involved, in their minds, had just cause for what they were doing. When looking back at events such as these, one can’t help but wonder, “what the heck were they thinking?” When in actuality the people of those times felt that what they were doing was totally justified. The same is true for the institution of slavery ... to enslave those who are less powerful. If we had not learned that it is more profitable to pay our workers than enslaving them, I am sure that slavery would still be present in today’s society. In some ways people of our “lower classes” have lives similar, or in some cases worse than those of slaves. They do not have a master to look out for them, they don’t have a roof over their heads every night for sure, they don’t even have the comfort of knowing that after work they will have a meal waiting for them. In conclusion, the institution ...
- 20553: Copper
- ... animal. Copper is a metallic metal. It can never be broken down into differnet substances by normal chemical means. Copper was one of the first metals known to humans. People liked it because in it’s native condition, it could easily be beaten into weapons or tools. Copper has been one of the most useful metals for over 5000 years. Copper was probably used around 8000 B.C by people living ... to these helmets in case some of the lighting in the mine goes out leaving a miner stranded in the dark. One of the biggest problems with mining is that in some places dangerous gas’s may exist, like Carbon Monoxide. In the past we had very cruel and inhuman ways to detect harmful gases. One of these ways was the use of canaries. Miners would let them fly into a ... the rats. Mines will often have mine cats that hunt out the rats. These cats are well fed and petted by most of the miners. Most copper is found in seven ores. That means it’s mixed in with other metals like lead, zinc, gold, cobalt, bismuth, platinum, and nickel. These ores will usually have only about 4% pure copper in them though. Sometimes miners may only find 2%. The ...
- 20554: CODEINE (C18 H2, NO3 H3PO4 1/2 H2O)
- ... plant. It was discovered in 1832 by French chemist Pierre-Jean Robiquet. Codeine constitutes about 0.5 to 2.5 percent of this plant substance. The drug has been in use since the early 1900's and it shares most of the pharmacologic characteristics of morphine, the other alkaloid in opium. Codeine is classified as a narcotic, it has the same painkiller effect as morphine but is only one-sixth to ... driving a car or operating machinery. (3) Patients receiving other narcotic painkillers, general anesthetics, tranquilizers, or other central nervous system depressants, including alcohol with codeine may exhibit an additive central nervous system depression. Who shouldn't take codeine? Pregnant women should not use codeine because safe use in pregnancy has not been established. Children below the age of three shouldn't be given this drug for that age group hasn't been established. Codeine should be given with caution to certain patients such as the elderly or debilitated, and prostatic hypertrophy or urethral stricture. Codeine ...
- 20555: Descartes
- Questions I & III It seems evident that due to it's limited access via social castes as well as it's provincial ideology once attained, education before the 1800's played a limited role in the history of Education. From the rhetoric-based Greek age of Plato and Aristotle to colonial America, education was mostly an elitist institution that was inaccessible to most and, ...
- 20556: Historical Development of Atomic Structure
- ... in 1919, he bombarded nitrogen gas with radioactive alpha particles, which resulted in atoms of an oxygen isotope and protons. A unit of radioactivity, the rutherford, was named in his honor. A colleague of Rutherford's at Cambridge University was a man named James Chadwick discovered the third fundamental particle that makes up the atom: the neutron. This discovery led immediately to the discovery of nuclear fission and the atom bomb ... 1885, was also a considerable man when it came to nuclear and atomic physics. He moved to Cambridge University in 1911, working under J. J. Thomson, but soon moved to Manchester to work under Rutherford's supervision. He won the Nobel Prize in physics in 1922 for his theory on atomic structure (also known as the Quantum Theory), which was published in papers between 1913 and 1915. He based his work around Rutherford's conception of the atom. This theory, that suggests that electrons only emit electromagnetic energy when they jump from one quantum level to another, contributed tremendously to future developing of theoretical atomic physics. His work ...
- 20557: Atom Book
- ... Today I'm going to introduce you to the world of atoms. Atoms are little things that you or anybody else have ever seen. Make up things like trees, cars, paper, even you. So let's shrink down to size and see what it's like. We're going to into the Helium atom today. An atom is made of little things called protons, nuetrons, and electrons. Protons have a positive charge, neutrons have no charge, and electrons have a ... number of electrons in each ring or shell. In this case helium has 1 ring with 2 electrons in it. An aatom can have up to only 7 rings. An atomic symbol is the letter(s) that describe the element. Like He means helium, but if you wrote it HE it could mean something totally different so be careful. An isotope has fewer or more neutrons than protons. So there ...
- 20558: Aluminum: The Element
- ... as a non-metal. It occurs most commonly as aluminum silicate or as a silicate of aluminum mixed with other metals such as sodium, potassium, iron, calcium, and magnesium. Charles M. Hall and Paul L. T. Heroult, independently and almost simultaneously found out that alumna, or aluminum oxide, would dissolve in fused cryolite (Na3AlF6) and then could be decomposed electronically into a crude molten metal. Uses- The given volume of aluminum ... to space shuttles. This element is very, very useful and is recyclable. We use aluminum for conductors as well. We use it to weld hardware together because of their great conductability. Since the early 1800's we have seen aluminum as a great metal with countless uses. But we can't make all the aluminum we need, although there is a lot on Earth, we have a certain amount that we can run out of if we don't re-use and recycle.
- 20559: The Atmospheric Ozone Layer
- ... at regular intervals, led to the development of the Dobson spectrophotometer in the 1960s. The British Antarctic Survey has the responsibility to routinely monitor stratospheric ozone levels over the Antarctic stations at Halley Bay (76°S 27°W) and at Argentine Islands (65°S 64°W). Analysis of ozone measurements in 1984 by a team led by John Farnam, made the startling discovery that spring values of total ozone during the 1980-1984 period had fallen dramatically compared to ... the tropics and the poles. The polar flux of ozone ceases as the westerly circulation dominant in winter is replaced by easterlies over the tropics. In the Southern Hemisphere the spring maximum occurs near 60°S, one to two months after the maximum in the subtropics. Throughout the summer, photochemical reactions reach a maximum in the lower tropical stratosphere and ozone concentrations fall. Autumn circulations are the weakest, with the ...
- 20560: Seeing the Vessels of the Retina
- Seeing the Vessels of the Retina Have you ever seen a doctor look into a patient's eye with an instrument called an "ophthalmoscope"? The instrument lights up the inside of the eye and magnifies the vessels of the retina in the rear of the eye. This gives the doctor an idea ... could not see the blood vessels in the back of their own eyes. EXPERIMENT My experiment was not about the tiny blood vessels that you can easily see on the surface of the eye. It's to do with the larger vessels All I had to do was take a person into a dark room with my flashlight. I had them cover their left eye and look down at the floor ... vessels with orange in the background...it looked like a lot of dead tree. BRENDA: The blood vessels resembled jagged lighting bolts or trees in the winter time. LAURA: I saw crooked lines that didn't stand still, but kept changing. DARWIN: The image appeared to be in front of the body and quite enlarged. I found that it takes practice to see this. BRYAN: Sometimes your eye gets tired ...
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