Science and Human Beings

Science enables human beings to progress rapidly and lead a better life. For example, Edison's invention of the light bulb brought our gloomy life to the end and created a bright world for us. Another case in point is Watt's discovery of the steam engine, which triggered the industrial revolution in the western countries, and later all over the world. Meanwhile, sometimes science does have some side effects. A good illustration of this is atomic energy, which can destroy human beings completdy when used in nuclear weapons. Anyhow, it is men who develop science. And science, in turn, will do us good in general. As for its side effects, I believe human beings will be rational enough to avoid them or keep them under control.
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verious document

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Chinese scientists

On October 12, 1989, some Chinese scientists were working at the computers to look for information they needed. Suddenly they saw a lot of very bright spots crossing the computers’s screens. At the same time the computers were working much slower. To find out what was happening they stopped their work to check some parts of the computers. To their horror, they found out that most of their stored information was got rid of by computer viruses ! Obviously all these computers had been infected by computer viruses.
　　It is said that the computer viruses were made by a group of young men fond of playing tricks. They all had excellent education. They created the viruses just to show their intelligence . These kinds of computer viruses are named Jerusalem Viruses. These viruses can stay in computers for a long time. When the time comes they will attack the computers by lowering the functions , damaging their normal programs or even getting rid of all the information.
　　We now come to know that Jerusalem Viruses often attack computers on Fridays and that they are spreading to a lot of computers. Among the countries that suffered computer viruses last year are Britain, Australia, Switzerland and the U.S. But fill now , how to get rid of the terrible viruses remains a problem.
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communications commissions

One of the key technologies of Ultra-wideband (UWB) system is pulse waveform design. UWB pulse waveform design should not only meet the constraint of Federal communications commissions(FCC) spectral mask,but also make full use of spectrum resources and improve the discount wedding prom dresses spectrum utilization efficiency.Because UWB system bandwidth is very wide, how to reduce the interference between UWB and the existed wireless network is an important problem. Furthermore, the different users use the same pulse waveform in the same system lead to multi-user interference (MUI), therefore another key problem of UWB pulse waveform design is to form a wedding dresses form china collection of orthogonal pulses shapes so as to reduce the MUI..Two ultra-wideband orthogonal pulses designed methods are introduced in this paper according to the above mentioned principles. One approach is to generate a new UWB orthogonal pulse based on Coiflets orthogonal dresses 1std wavelets, and then combine the series of pulses which produced by the primary wavelet function. The computer simulation results demonstrate that the new designed UWB pulse waveforms satisfy the restriction of wedding dresses 2nd FCC emission mask and can achieve high spectrum utilization. The second approach is to propose a new method for UWB pulse waveform design that based on the combination of Gaussian derived function and Gram-Schmidt orthogonal methods. The design idea is to combine the Gaussian derived function, and then form a new orthogonal pulses using the Gram-Schmidt orthogonalization method based on the combined waveform. MATLAB simulation results show that the new designed UWB pulse waveforms satisfy the restriction of FCC emission mask and they are totally orthogonal. They can be used for multi-user communication system to reduce the interference of multi-user systems.At last, we summarize our main studies of this hot women's dresses paper and point out the existent problems,and then take an outlook for further research.
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