弧

To assess the condition of arc quenching chamber of circuit breaker without disassembly itself, Dynamic Resistance Measurement is introduced in this paper.

介绍了一种不用打开灭弧室就可以评估断路器灭弧室状况的方法———动态电阻测量法，用此法很容易判断弧触头的烧损数值。

The content of this course mainly include the feature, equipment, principle and application of high efficient welding method, for example, activating flux assisted TIG welding, narrow gap TIG welding, hot wire TIG welding, oscillating arc TIG welding, plasma TIG welding tandem MIG welding, hybrid arc welding, surface tension transfer MIG welding, oscillating arc MIG welding, mixed-gas MIG welding, two wire or more SAW welding, friction stir welding and laser-MIG hybrid welding, etc.

主要内容涉及到助焊剂TIG焊技术、窄间隙TIG焊技术、热丝TIG焊技术、摆动电弧TIG焊技术、等离子弧焊技术的基本原理、设备、特点和应用。双丝焊MIG方法、复合电弧技术、表面张力过渡、摆动电弧MIG、交流MIG焊、混合气体MIG焊的原理、特点、设备和应用。双丝以及多丝埋弧焊技术、窄间隙埋弧焊技术的原理、特点和应用。搅拌摩擦焊以及激光电弧复合焊接的原理、特点、设备、应用范围。

For AA8090 alloy without exfoliation , the EIS is comprised by a depressed capacitive arc at high frequency and an inductive arc at low frequency, and the inductive component weakens and also disappears with time.

结果表明，剥蚀发生之前，AA8090合金电化学阻抗谱由一个压缩的高频容抗弧和一个低频感抗弧组成，且低频感抗成分随浸泡时间延长而减弱并消失；一旦发生剥蚀，其电化学阻抗谱即由一个高频和一个低频两个容抗弧组成。

Passing analysing The link of the three-arc-sect isometric type surface, built the three-arc-sect isometric type surface equation, found the location of isometric type surface with the finite element analysis method and calculated the link intensity of the three-arc-sect isometric type surface.

文中对型面联接中的三弧段等距型面联接进行力学分析，首先建立三弧段等距型面方程，应用有限元法确定等距型面接触点的位置，对三弧段等距型面联接中的应力分布及大小进行分析计算。

A rectifier used in high-voltage direct current power transmission systems and industrial processing between about 1909 to 1975 is a mercury arc rectifier or mercury arc valve .

汞弧为整流高压直流电源传输系统中的使用和工业加工 1909年到 1975年之间是汞弧整流器或汞弧阀。

Result The heterobacteria, vibrios and pathogenic Vibrio parahaemolyticus were the roost in fertilized eggs of shrimp rot the least in nauplius, then their number would increase with growth. During whole rearing period, both heterobacteria in larvae, vibrios in water would increase by one order of magnitude, while both vibrios in larvae and heterobacteria in water would increase by two orders of magnitude.

结果］异养菌、弧菌和致病性副溶血菌数量都是对虾受精卵中高，无节幼体中最低，而后逐渐升高在整个育苗期，对虾幼体中异养菌和养殖水体中弧菌增加1个数量级，对虾幼体中弧菌和养殖水体中异养菌均增加2个数量级。

Thirdly, the principal curve and polygonal line algorithm are introduced, and an implementation of polygonal line algorithm based on Quasi-Newton numerical optimization is illustrated. The simulation results show that when this algorithm isused in the detection of curvilinear defects on wafer map, it can converge fast, compute accurately and meet the demand of application of defects pattern analysis, and with the number of line segment increasing, the polygonal line will approximate to the Kegl principal curve.

研究了主曲线、多边形线算法，提出用多边形算法识别弧状缺陷想法，讨论了用拟牛顿法实现该算法的解决方案，针对硅片缺点模式分析中常出现的弧状缺陷，采用该算法进行检测分析，实验结果表明这种算法快速准确，当线段个数或最小距离平方期望值达到一定门限值后，多边形线就已经能够描述弧状缺点集的形状，随着线段个数增加，最小距离平方期望值还在不断下降，最终会收敛到Kegl主曲线。

For exploring new and highly successful experiment methods for analyzing reflex arc,two reflex tests have been added on the basis of the traditional test method.

反射弧分析实验在中学生物学和大学的生理学实验中都要涉及到，是一个很经典的实验，可以帮助学生理解反射弧的组成及反射弧的完整性与反射活动的关系，是各类高等师范院校生物系必做实验之一。

This subject is a sub subject of the subsidy project of the national natural fund, the project is studied on kinematics principle and structure techniques of roller of arc spring tooth for collecting plastic film residue .

本课题是国家自然基金资助项目——弧型挑膜齿残膜清理滚筒的运动学原理及工艺结构研究的子课题，残膜捡拾滚筒是弧型齿残膜回收机的关键部件，本文针对弧型齿残膜捡拾滚筒在工作中存在的实际问题，结合试验进行了研究分析，提出了一些改进意见。

The height of central part of the round cambered surface is equal or higher than the one of ring- shaped bulge. When the horizontal top side of internal cavity of encapsulation mold is pressed down to the heat sink so as to produce a deformation, the cambered surface can not be pressed to oppress the subjacent metal line, and the ring-shaped bulge can also prevent mold-overflow.

该散热片，适用于封装制程，具有一圆形弧面板部，并且其圆形弧面板部的中央是高于或等于环状凸起的高度；如此一来，当封胶模具内模穴的水平顶面下压至散热片上而使其产生变形时，圆形弧面板部就不会压迫到下方的金属线，而环状凸起同样也可发挥防止溢胶的功能。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。