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Search results 361 - 370 of 1233 matching essays
- 361: Tessellations
- ... But sadly, about two hundred years passed before new scientific studies about tessellation’s was made. Tessellation In Science Beside from being studied in math or geometrical studies, tessellations and tilling have been study with x-ray crystallography. X-ray crystallography is a science with the repeating arrangements of identical objects as found in nature, sound familiar? Of course! This is very similar to the definition of tessellation. Interestingly, the discoveries made with x-ray crystallography during the mid-20th century are similar to many of the discoveries the artist M. C. Escher made while designing for his tessellated artwork. Several other scientific studies have been found for ...
- 362: Slavery In America
- ... white supremacy and their groups, black too had a weapon. Martin Luther King Jr. led his people to march in Washington to end segregation and to form black unity for an equal and better America. Malcolm X, who was a Muslim, may have come from a different religion than his Christian counterpart, but had a very similar message and a similar fate. Both were assassinated. Today the hate groups of America have ...
- 363: Technetium
- ... leading to new theories of the production of heavy elements in the stars. Nineteen isotopes of technetium, with atomic masses ranging from 90 to 108, are known. 97Tc has a half-life of 2.6 x 10^6 years. 98Tc has a half-life of 4.2 x 10^6 years. The isomeric isotope 95mTc, with a half-life of 61 days, is useful for tracer work, as it produces energetic gamma rays. Technetium metal has been produced in kilogram quantities. The metal ... It is reported aerated distilled water at temperatures up to 250C. This corrrosion protection is limited to closed systems, since technetium is radioative and must be confined. 98Tc has a specific activity of 6.2 x 10^8 Bq/g. Activity of this level must not be allowed to spread. 99Tc is a contamination hazard and should be handled in a glove box. The metal is an excellent superconductor at ...
- 364: The Sequence of Chemical Reactions
- ... the copper. Rinse the copper with distilled water and steam dry. Weigh the mass. DATA/RESULTS initial mass of copper (g) 0.319 final mass of copper (g) 0.305 % recovery = (final mass/initial mass) x 100 95.6 OBSERVATIONS -between steps 1 through 4 the solution is blue. -between steps 5 through 8 the solution is dark brown. -between steps 9 through 12 the solution is blue-green. -between steps 13 through 16 the Zinc turns red as the blue color slowly leaves the solution. CALCULATIONS % Recovery = (final mass / initial mass) x 100 % Recovery = (0.305 - 0.319) x 100 % Recovery = 95.6% CONCLUSION (a) The overall yield of the reaction was 95.6%. There may have been copper lost in transfer from beaker to beaker or stuck to the stirring rod while ...
- 365: Mars
- ... last terrestrial planet from the Sun. Mars follows closely behind Earth but is comparatively smaller, with about half the diameter of Earth (6,794-km) and about one-tenth of Earth’s mass (6.419 x 1023 kg). Thus the force of gravity on Mars is about one-third of that on Earth. Mars is probably the planet we know the most about since it is so close to Earth, though ... which leads most scientists to believe that Phobos and Deimos are captured asteroids. Phobos’ mean distance from Mars is 9,377-km and Deimos’ is 23,436-km. The mass of Phobos is 10.8 x 1015 kg and the mass of Deimos is 1.8 x 1015 kg, which is quite small. This also suggests their being asteroids pulled into orbit around Mars. Extraterrestrial Life? Mars has been the subject of much discussion lately, mostly because of the bacteria-like ...
- 366: Atomic Bomb
- ... a sample with his famous equation “E=mc^2”. Using this equation, the amount of energy in 1 gram of a substance can be found: 1 g = 0.001 kg c = speed of light = 3 x 10^8 m/s E= (0.001 kg) x (3 x 10^8 m/s)^2 = 300,000 Joules In one gram of a substance, there is the potential for 300,000 Joules of energy to be released. Most nuclear weapons, however, use much more ...
- 367: Irene Joliot-curie
- ... and physics. Her education was interrupted by World War I. In 1916, Irene left the Sorbonne to assist her mother, Marie Curie, who at that time was a nurse radiographer, with the fleet of mobile x-ray facilities, that she and her mother pioneered, that helped to save the lives of so many wounded soldiers. This helped to expose doctors to the benefits of x-ray technology. Irene extended this work by directing the development of diagnostic x-ray facilities in military hospitals in France and Belgium. After the war, she received a Military Medal for this endeavor. In 1918, Irene joined the staff of the Curie Institute as her mother's ...
- 368: The Software Industry Report
- ... most common software packages sold to the So-ho user market are the following: ? Business application software - word-processors, spreadsheet, databases, desktop publishing programs, programming languages, utilities etc. ? Operating systems - MS-DOS, DRDOS, Windows 3.x, Windows 95, 98, Macintosh System 7 ? Educational software - e.g. Encarta ‘98 ? Entertainment software - e.g. games The definition does not include software written for the traditional 8-bit home computer hardware including the Commadore ... in 1975. The company was created on the success of its programming languages - BASIC, FORTRAN, and COBOL - and the MS-DOS operating system for the IBM PC which was then collated by the Windows 3.X GUI (60 million copies shipped)? and more recent packages Windows 95 and 98. Microsoft commands virtually all of the market for P.C operating systems for the home user. The companies O.S systems are ...
- 369: Basking Shark
- ... many sources, the life span of the Basking shark* great white shark (http://www.askjeeves.com/MetaAnswer.asp?MetaEngine =Lycos&logQID=8F7C6F5E10E0D2119B5300104B2AFFF7&qCategory=SCI_&q Source=0&frames=yes&site_name=Jeeves&scope=web&r=x&MetaTopic=The+B asking+Shark+Project&MetaURL=http%3A%2F%2Fwww.isleofman.com%2Finte rests%2Fshark%2Findex.htm&EngineOrdinal=3&ItemOrdinal=1&ask=basking+s hark+metasearch&MetaList=http%3A%2F%2Fwww.isleofman.com%2Finterests %2Fshark%2Findex.htm&ask.x=22&ask.y=1). When alive and healthy, Basking sharks are grayish brown, and even black on the top half of their body and a much paler version of those colors on the bottom. They ...
- 370: Masters Of The Universe
- ... star system will die and become a black hole. When this happens, the force of the black hole s gravity will literally suck the matter away from it s sibling, and in doing this emitting X-rays that can be received on Earth(Filkin 225). This is one way that astronomers can find black holes. It is possible that our galaxy is powered by a black hole(Freedman 69). Astronomers Linda ... ways to find it(Intro. to Black Holes 1). First, if a star is sighted that was circling something that could not be seen, that object is likely a black hole(Filkin 224). Second, view X-rays that are given off by the black hole through the use of radio telescopes(Filkin 225). In a galaxy without a black hole at the center, stars closer to the center would move slower ...
Search results 361 - 370 of 1233 matching essays
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