查询词典 a trace

This method was used to detect trace gallium in pure aluminum samples with satisfactory results.

研究了纯铝中痕量镓的示波极谱的直接测定方法。

BACKGROUND: Gallium is a non-essential trace element in the human body.

摘要背景：镓是一种人体内非必需微量元素。

The problem of finding stabilizer quantum-error-correcting codes can be transformed into the problem of finding additive self-orthogonal codes over the Galois field GF(4) under a trace inner product.

寻找量子稳定子码的问题可以转化为寻找GF(4)上迹内积自正交的经典加码的问题。

The correlation coefficient is 0.9991. The method has been applied to the determination of trace cadmium in galvanization waste water with the relative standard deviation of 2.5%-3.2% and the recovery of 98.0%-102.0%. The results of this method are in good agreement with those of AAS.

方法用于电镀废水中微量锡的测定，相对标准偏差为2.5%~3.2%，加标回收率为98.0%-102.0%，测定结果同原子吸收光谱法的测定结果相吻合。

Once in a while, an old cat would rush upon top of the wall and lay in front of the grass closing her eyes to refresh her spirit. The accompanying kitten would claw at the grass at leisure to gambol as if it was the fellow. I did not find the trace of the kitten, maybe it was snoring at a warm corner on this day.

偶尔会有一只老猫，窜上墙头，躺在它跟前闭目养神，跟来的小猫闲来无事，就用小爪抓挠着狗尾巴草，当成自己的对手来嬉戏，今天我没有见着它的踪迹，想是躲在在哪个温暖的角落里打着呼噜吧。

The theories on pyrolysis and coking and hydrogenation of heavy oil are used to know the liquefaction and gasify and coking of coal. 3. The results of particle feeding in the hot plasma jet (1) By using the cold state of spraying the diesel oil mist transversely in the air flow at the subsonic and ultrasonic speed to imitate the stress condition and motion trace of coal powder in the plasma jet, it shows that with the speed of air flow changed from subsonic speed to ultrasonic speed, the uniformity of mixture between the coal powder with certain speed and air flow becomes worse, mixture length becomes shorter, which agrees with the law of momentum transfer.

三、热等离子体射流中颗粒注入研究的结果(1)利用柴油油雾在亚、超音速气流中横向喷射冷态模拟煤粉在等离子体射流中的受力和运动轨迹，结果表明随着气流速度由亚音速向超音速增加，一定速度的煤粉与气流混合均匀度变差，混和长度增加，符合动量传递规律。

The relationship between trace elements and the factor that causes gastritis is discussed.

探讨了微量元素与胃炎发病因素的关系。

The bullfight history of Spain can trace back to more than 2,000 year agos, they are the objects that takes gaur as to hunt to get first, and then take it does the game, then throwing in it into the war.

西班牙的斗牛历史可追溯到两千多年前，他们先是以野牛为猎获的对象，而后拿它做游戏，进而将它投入战争。

One is to parse the traffic trace file by using gawk, and the other is to insert some codes in C++ codes.

这篇文章是对实际效果和仿真效果进行比较，修改一些仿真参数，以达到更接近实际的效果。

In this paper,a new method in which the principle of the contact trace is combined with auto programming in grinding a finger gear cutter is introduced.

本文介绍了采用接触轨迹原理结合自动编程刃磨指状齿轮铣刀的新方法。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。