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Search results 5491 - 5500 of 7924 matching essays
- 5491: Fiber Optics
- ... PVC or some other impervious material, which forms a hermetic seal around the instrument. The shaft is about 10mm in diameter; about 0.6-1.8 m long (depending on the application) and has a short deflectable section about 50-85mm long leading to its distal tip. Within the shaft lie: (a) at least one non-coherent fibre-optic bundle to transmit light from the distant light source to the distal ...
- 5492: Radio Waves
- ... a "carrier" radio wave. The result : a wave that transmits voice or programming as its amplitude ( intensity ) increases and decreases. Amplitude modulation is used by station broadcasting in the AM band and by most international short wave stations. Frequency modulation is another way to convey information, voice , and music on a radio wave is to slightly change, or modulate, the frequency. The main advantage of FM broadcasting is of it is ...
- 5493: Comets
- ... orbits that deviate significantly from Newtonian gravitational motion. This provides clear evidence that the escaping gases produce a jet action, propelling the nucleus of a comet slightly away from its otherwise predictable path. In addition, short-period comets, observed over many revolutions, tend to fade very slowly with time, as would be expected of the kind of structure proposed by Whipple. Finally, the existence of comet groups shows that cometary nuclei ...
- 5494: Black Holes
- ... is allowed by a quantum mechanism called virtual particles. As a consequence of the uncertainty principle, and the equivalence of matter and energy, a particle and its antiparticle can appear spontaneously, exist for a very short time, and then turn back into energy. This is happening all the time, all over the universe. It has been observed in the Lamb shift of the spectrum of the hydrogen atom. The spectrum of ...
- 5495: We Are Not Alone
- ... which was discovered by a pair of Arizona rock hounds, was damaged when the sedimentary encrustation was being removed and therefore couldn't be tested (Montgomery 221). Since the dawn of time man has told stories of heavenly and demonic beings coming to rule, teach, torment, seduce and provide salvation. Every culture has myths of ancient gods who strode through the heavens. The American Indians had the cachinas who taught them ...
- 5496: Genetics Engineering
- ... Pure panacea. As soon as a baby is born his or hers parents will know everything about him or her. If they will be artistic. Will she get breast cancer? Will he be tall or short? Is he a genius. Ten years from 2005, these questions won't even have to be asked. Made to order babies. Made to order babies?!? Is this where we are headed? It's only a ...
- 5497: "A Wrinkle in Time"
- ... consciousness Meg expressed that she was distraught about leaving her brother on the planet Camazotz and did not want to go any further towards home without him. The heralds appeared once again and after a short battle with Mr. Murray and Calvin the decision was made that Meg was the best person for the job of returning to Camazotz to rescue Charles Wallace from the evil forces (IT). The focus of ...
- 5498: Roswell Incident
- ... any kind of secret military apparatus, the Army would have said simply, This is secret, and no more questions will be answered, period. The Army would not have concocted the flying saucer and weather balloon stories. In 1947, Americans were less skeptical about the motives of their government, and the people of New Mexico, including journalists and other civilians, were dependent for their livelihood on secret military projects. * If what crashed ...
- 5499: The Application of Science to Engineering
- ... much less effective. It encodes messages electrically, transmits them over facilities such as copper wire, coaxial cable, and fibre optics to their destination where they are decoded into their original form. Combinations of long and short bursts of electric current are sent through a circuit thereby encoding each letter of the alphabet. More efficient transmission facilities were developed as the mining industry developed. The discovery of electricity sped up the development ...
- 5500: Salt and Its Uses
- ... salt is connected with heart disease, circulator disorder, stroke and even early death. By many doctors and researchers are now beginning to feel that salt has gone too far. At the University of Alabama, a short-term research has been done on 150 people on the effect of the intake of salt related to high blood pressure. Result shows that those with normal blood pressure experience no change at all when ...
Search results 5491 - 5500 of 7924 matching essays
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