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Search results 6471 - 6480 of 14167 matching essays
- 6471: Microbursts
- ... precipitation drag and cooling due to the evaporation and melting of precipitation particles. In a microburst, the downdraft intensifies with heavy rain and when dry air is mixed into the downdraft causing evaporative cooling and great negative buoyancy. A Microburst may occur in airmass, multicell, and supercell thunderstorms. Isolated, single cell storms present a greater hazard to aviation; because, they are common, small scale, rapidly developing, and they have strong outflows ... avoid it, effectively removing a hazard that has caused over 26 U.S. air carrier accidents between 1964 and 1985. The ultimate culmination of wind shear research in the past 20 years has been a great move forward in the safety of our skies. Aircrews will have, in the near future, a predictive airborne system to help them determine a course of action to avoid microburst wind shear. The associated results ...
- 6472: Our Solar System at a Glance
- ... and the European Space Agency. On February 8, 1992, Ulysses flew close to Jupiter and used Jupiter's gravity to hurl it down below the plane of the planets. Although it will still be at great distance from the Sun, Ulysses will fly over the Sun's polar regions during 1994 and 1995 and will perform a wide range of studies using nine onboard scientific instruments. We are fortunate that the ... can form in valleys. There is evidence that in the past a denser martian atmosphere may have allowed water to flow on the planet. Physical features closely resembling shorelines, gorges, riverbeds and islands suggest that great rivers once marked the planet. Mars has two moons, Phobos and Deimos. They are small and irregularly shaped and possess ancient, cratered surfaces. It is possible the moons were originally asteroids that ventured too close ...
- 6473: Uranium: Nuclear Friend or Nuclear Foe
- ... the project would later be used on Hiroshima and Nagasaki Japan, thus ending World War II. Uranium was used in weapons for many years after World War II. After World War II the U.S., Great Britain, France, the Soviet Union, and China conducted many more nuclear weapons test and experiments. These countries also used uranium for many other military purposes. Such examples of this are the launch of the first ... Shippingport, Pennsylvania. This power plant used uranium to perform fission. The heat from the fission heated water, the steam from the water then turned turbines, thus creating electricity. The opening of this plant was a great success, with this success France, the Soviet Union, and the United States made plans to build many more reactors within their borders. At this time all the information about nuclear power was not known by ...
- 6474: Into the Depths of A Black Hole
- ... a black hole is, we must first take a look at the basis for the cause of a black hole. All black holes are formed from the gravitational collapse of a star, usually having a great, massive, core. A star is created when huge, gigantic, gas clouds bind together due to attractive forces and form a hot core, combined from all the energy of the two gas clouds. This energy produced is so great when it first collides, that a nuclear reaction occurs, and the gases within the star start to burn continuously. The Hydrogen gas is usually the first type of gas consumed in a star and then ...
- 6475: Stars
- ... a standard at the same height above the horizon, astronomers using photoelectric photometers can measure U, B, and V magnitudes with an accuracy of 0.01 magnitude (see PHOTOMETRY, ASTRONOMICAL). Such photometry has provided a great deal of information regarding the temperatures and energy output of stars, but it does not give the total energy output. Each measurement (U, B, V) gives only a fraction of the star's light reaching ... and beryllium are probably also involved. The NEUTRINO is a very-low-mass particle that is produced in the Sun's core and can pass through its outer regions to enter space. One of the great mysteries of modern astrophysics is the failure of experiments to detect the neutrinos expected from nuclear reactions in the Sun. Whether by the Bethe cycle or by the proton-proton reaction, the Sun and other ...
- 6476: Supernova
- ... is a WHITE DWARF, a small, dense star that is near the end of its nuclear burning phase. After attracting matter from the companion star for some time, the white dwarf eventually collapses with a great rush, becoming a neutron star, and ejecting matter outward. This rebound of matter is thought to be the supernova. Stars with large masses burn their nuclear fuel very rapidly. Within a million years or less ... Historical Supernovae (1977); Jastrow, Robert, and Thompson, Malcolm, Astronomy (1984); Marschall, Laurence A., The Supernova Story (1988); Murdin, Paul and Leslie, Supernovae (1985); Shy, Frank, The Physical Universe (1982); Woosley, Stan, and Weaver, Tom, "The Great Supernova of 1987," Scientific American, August 1989; Zeilik, Michael, and Gaustad, John, Astronomy (1983).
- 6477: The Rain Forest - Example of a Flourishing Ecosystem
- ... Many of the people around us seem to think that these people are ignorant, when in fact the opposite is true. "Forest Dwellers" as they are commonly called are brilliant naturalists, mainly because of their great knowledge, and use of, the plants and animals within their environment. The greatest use and perfection of this combination has to be given the Pygmies. The Pygmies are a West African tribe that are said ... Along with all these plant and animal species comes something that is commonly over looked in the rainforest, and they are humans. There are over two million tribal people living in the world and a great deal of them live within the rainforest. They use the materials found here to supply there food, make their weapons and cure their sick. All of these things come together to form one of the ...
- 6478: The Laser
- ... more. Measurement: Lasers have become an important part of measurement. A laser is the fastest way to measure long distances. This use can be applied in construction work and astronomy. Cutting: A laser is also great for cutting objects. It can get to those hard to reach places by the use of mirrors to bend the beam of light. It also is strong enough to cut through solid steel. A laser ... military. Unlike what is seen in science fiction movies where a laser gun could be used as a hand weapon, using today's technology lasers that powerful would have to be as big as the great pyramids in Egypt. Instead, we use them for range-finding devices or guiding weapons or missiles. An example of a range finding device is a special kind of binoculars that sends out a laser beam ...
- 6479: Inventions of the Early 19th Century
- ... would attract or repel a small arm connected to a pencil which would trace zigzag signs onto a strip of paper running under the arm at a constant speed. This early plan didn't offer great practical possibilities, mainly because the batteries then available could not produce a current strong enough to push the signal great distances. As an artist and sculptor, Morse had the personal qualities to succeed as inventor of the telegraph: intelligence, persistence, and a willingness to learn. What he lacked was: knowledge of recent scientific developments, adequate ...
- 6480: The Black Hole
- ... a black hole is, we must first take a look at the basis for the cause of a black hole. All black holes are formed from the gravitational collapse of a star, usually having a great, massive, core. A star is created when huge, gigantic, gas clouds bind together due to attractive forces and form a hot core, combined from all the energy of the two gas clouds. This energy produced is so great when it first collides, that a nuclear reaction occurs and the gases within the star start to burn continuously. The Hydrogen gas is usually the first type of gas consumed in a star and then ...
Search results 6471 - 6480 of 14167 matching essays
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