查询词典 vacuum

In this paper,electric field in a vacuum interrupter is calculated and analyzed systematically and wholly with the method of numerical calculation.

本文采用数值计算的方法对真空灭弧室内的电场及影响其分布的一些因素进行了比较全面和系统的计算。

Influence of X-rays in Vacuum Interrupter on Human Health

它是利用X射线穿透金属晶格时发生衍射的原理，测量金属材料或构件的表面层由于晶格间距变化所产生的应变，从而算出应力的一种实验方法。

For the former,beside the opening and closing characters of vacuum interrupter,two problems should been related to.

真空开关优化设计涉及多方面的内容，主要集中在电气参数与机械参数。

Yuguang brand vacuum interrupter is exported to the United States, Russia, Germany, Japan, India, South Korea etc more than 20 countries and regions.

宇光牌真空灭弧室的生产及销售位列全国前三强，并远销美国、俄罗斯、德国、日本、印度、韩国等二十多个国家和地区。

For a ZN-6/600 vacuum interruptor, its statistical properties of current chopping,breakdown of contact gap and high frequency current interruption were obtained through experiment.

本文介绍了真空开关开断单相感性小电流的试验方法和计算机模拟的计算方法。

On this basis, the prccesses of interrupting small inductive current by the vacuum interruptor were modelled in a computer program, and the effects of the circuit conditions on the vacuums ...

通过试验和模拟计算，获得了ZN—6/600真空开关有关截流、触头间隙击穿和电流高频过零熄弧的随机特性，分析了一些电路条件对真空开关开断感性小电流时的操作过电压的影响。

Interstice vacuum suction of bond head rotary work, save one second suction time and reduce the gas wastage.

间隙式真空吸附于压头组工作交替配合，节省了近1/2吸附时间且降低了气源损耗

The excessive β-ionone and the catalysts can be reused via vacuum distillation and filtration.

未反应的原料经减压蒸馏回收利用，催化剂经过滤分离、活化，其重复使用性良好。

Results show that 4-oxo-β-ionone is the major product with yield of 53.5% under the conditions as follows: reaction temperature 45℃, reaction time 24 h, the molar ratio of n: n(NaClO3): n 20: 100: 3, and pH value of solution in 1-3; on the other hand, 5,6-epoxy-β-ionone is major product with yield of 25.4% when reaction temperature is 40℃, reaction time is 24 h, the molar ratio of n: n(NaClO3): n is 20: 120: 5, and pH values of solution is 3. The excessive β-ionone can be recovered by vacuum distillation for reusing again. 4-oxo-β-ionone and 5,6-epoxy-3-ionone were purified by recrystallization and silica gel column chromatograph respectively with the purity over 98%.

研究结果表明：氯酸钠氧化β-紫罗兰酮的反应主要生成4-氧代－β-紫罗兰酮和5，6-环氧－β-紫罗兰酮，经重结晶和硅胶柱层析分离，纯度高于98%；4-氧代－β-紫罗兰酮的有利合成条件是反应温度为45℃，反应时间为24h，溶液的pH值为1~3，反应物配比n：n(NaClO3)：n为20：100：3，最佳收率为53.5%；5，6-环氧－β-紫罗兰酮有利的合成条件是反应温度为40℃，反应时间为24h，溶液的pH值为3，反应物配比n：n(NaClO3)：n为20：120：5，其收率为25.4%；未反应的β-紫罗兰酮经减压蒸馏回收后可重复使用。

The spin coating and vacuum evaporation methods were used to assemble porous silicon with Alq, irrespectively.

同时，由于复合结构中产生由多孔硅向MEH-PPV的能量转移，使得复合结构中MEH-PPV的发光峰红移。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。