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High power and super-high speed semiconductor switch RSD has great advantages in pulse power system : simultaneous turn-on in all area, high di/dt, high speed, high power, low power loss, infinite series, easily used in series and parallel connection, low cost and long lifetime etc.

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Effects of dry temperature and dry time on properties of heat cured sand and the relationship with binder composition are as follows:sands bonded by binders that are not modified have high strength when dry temperature is high and dry time is long,but their anti-wettability power is poor . Sands bonded by binders that are modified by B but not modified by M can be dried quickly and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M but not modified by B can also be dried quickly to obtain maximum strength,then the strength becomes lower when they are dried continually for more time. and sand strength is high but anti-wettability power is also poor. Sands bonded by binders that are modified by M as well as by B at the same time can be dried quickly to obtain maximum strength at low temperature and short time. But the anti-wettability of sand mold is best when they are dried at high temperature and long time.

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objective to study high risk population,high incidence time of traffic accident injuries,in order to provide evidence of prevention of traffic accidents.methods review inquiry,epidemiological analysis were performed.results there were 557 cases of traffic accidents before hospital in 2004.the traffic accident was the first in traumatism,the accounting for 51.86%.in 2004,the month of high incidence was july to december.people were on duty and off duty that was the high incidence time of traffic accident injuries in a day.the age of high incidence was 20 to 39 years old.the injury rate of males was higher than that of females.conclusion the measures of prevention and control are to strengthen traffic safety education,improve road safety level and quantity.

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This paper introduces the research and implementation of all-purpose high-speed test adapter for ADC. The main contents includes two methods about how to testing the static parameters and dynamic parameters for ADC. The servo loop method is proposed to static parameters, by using the test principle of high-precision voltage source, high-precision voltage meter and digital comparator. To dynamic parameters, the DDS chip of AD9851 is used to generate sine waves with high signal to noise ratio, then the high-s...

servo loop ； FFT 国产高清欧美日韩；本文介紹了關于ADC高速通用測試適配器的研究和實現最新95在线精品自拍视频，主要介紹了測試ADC芯片靜態(tài)參數和動態(tài)參數兩種方法，針對靜態(tài)參數国产精品日韩无码强奸乱伦，提出了用伺服環(huán)的方法美女裸体黄18禁免费网站，采用高精度電壓源，高精度電壓表和數字比較器的測試原理在线欧美一区亚洲；針對動態(tài)參數直接免费可以观看的黄色网站，提出了用DDS芯片AD9851產生高信噪比的正弦波，采用高速采樣模塊采集數據人人操人人膜，最后用FFT算法對采集的數據進行處理。

Aramid fiber-wide known as "poly p-phenylene terephthalamide of p-phenylenediamine", the English called Aramid fiber is a new type of high-tech synthetic fiber, with ultra-high strength, high modulus and high temperature, acid-alkali resistance, light weight excellent performance, the strength of steel wire 5-6 times the modulus for the steel wire or glass fiber 2-3 times, toughness is the wire 2 times the weight of the public for the steel wire 1 / 5 of about 560 degrees in the high temperature does not decompose, does not melt.

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The high temperature and high pressure experiments show that the strength of rocks is very high in earthquake source (mainly granitic rocks, such as adamellite), which could sustain great different stress and accumulate huge energy. This is one of major causes for high-angle reverse fault slip and high intensity of Wenchuan earthquake.

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