定

In the titrimetric experiment, the indicator, which is joined suitably, may reduce the experimental error effectively.

在酸碱滴定中，正确使用指示剂，可以有效地减少滴定误差。

This paper discusses the reaction principle and titrimetric operation in defining consistency of potassium permanganate titrant which sodium oxalate is regarded as the basis material.

分析了以草酸钠为基准物标定高锰酸钾标准溶液浓度的反应原理，标定操作及温度、酸度、滴定速度等滴定条件对标定结果的影响。

With respect to the experimental research on the unsteady flow fields of oscillating cascades, a two-dimensional oscillating cascade test rig is constructed, in which the blades can vibrate torsionally around their midchord at frequencies up to 18Hz.

在振荡叶栅非定常流动的实验研究方面，本文建设了二维低速振荡叶栅实验台，叶片可绕弦中点作扭转振动，振动频率最高可达18Hz，采用压力传感器测量叶片表面的非定常压力。

The present work is mainly focused on developing airfoils numerical simulation methods for steady and unsteady transonic flow.

本文主要发展了计算翼型跨音速定常及非定常粘性绕流的数值模拟方法。

Results:Adding water,alcohol and triethanolamine and when the temperature is at 20℃ make the titration end-point keen and easy to decision.

结果：滴定的温度20℃、在被测溶液中加入适量的水、乙醇和三乙醇胺能使滴定终点突跃明显，终点易于判断。

At length he would reach the corn, and selecting a suitable ear, frisk about in the same uncertain trigonometrical way to the topmost stick of my wood-pile, before my window, where he looked me in the face, and there sit for hours, supplying himself with a new ear from time to time, nibbling at first voraciously and throwing the half-naked cobs about; till at length he grew more dainty still and played with his food, tasting only the inside of the kernel, and the ear, which was held balanced over the stick by one paw, slipped from his careless grasp and fell to the ground, when he would look over at it with a ludicrous expression of uncertainty, as if suspecting that it had life, with a mind not made up whether to get it again, or a new one,or be off; now thinking of corn, then listening to hear what was in the wind.

最后，它终于到了玉米旁，拣定一个玉米穗，还是用那不规则三角形的路线跳来跳去，跳到了我窗前堆起的那一堆木料的最高峰上，在那里它从正面看着我，而且一坐就是几个小时，时不时地找来新的玉米穗，起先它贪食着，把半裸的穗轴抛掉；后来它变得更加精灵了，拿了它的食物来玩耍，只吃一粒粒的玉米，而它用一只前掌擎起的玉米穗忽然不小心掉到地上了，它便做出一副不肯定的滑稽的表情来，低头看着玉米穗，好像在怀疑那玉米穗是否是活的，决不定要去拣起来呢，还是该另外去拿一个过来，或者干脆走开；它一忽儿想看玉米穗，一忽儿又听听风里有什么声音。

As to the high polarity, high boiling point resultant—trimesic acid, the analysis methods of infrared spetrum, gas chromatography-mass spectroscopy, vapour-phase chromatography, acid number titration and so on are seperately used to characterize its property. Infrared spetrum and gas chromatography-mass spectroscopy are used to have a qualitative analysis on the resultant and are compared with the stand diagram. Sulfuric acid-methanol esterification and rapid esterification are used to prepare the trimesic acid trimethyl-ester and have a FID quantitative analysis. So that we make sure the purity of trimesic acid in the resultant and also we have an acid alkali titration on the resultant to get its acid number, in order to verify the purity of trimesic acid in the resultant.

对于高极性、高沸点的固体产物均苯三甲酸，分别采用红外光谱、气质联用、气相色谱、酸值滴定等分析手段进行了表征：利用红外光谱、气质联用的方法进行产物的定性分析，并与在同一仪器、同一条件下做出的标准谱图进行比对；采用硫酸-甲醇酯化法和快速酯化法制备出均苯三甲酸三甲酯，对其进行气相色谱FID定量分析，进而确定固体产物中均苯三甲酸的纯度；用酸碱滴定法确定固体产物的酸值，以对固体产物中均苯三甲酸的纯度进行验证。

However, in electric field computation, the BEM has not much unfould and most of them are limited in the conventional BEM. In the flow field computation, although some achievements have been gained in solving the constant and uncompressible fluid flow by using BEM, but to the inconstant, compressible, nonlinear, transonic flow, such as the flow in the arc quenching chamber in SF6 high voltage circuit breaker, no any report has been published up to now for the reason that the basic solution of this kind of flow has not been found.

目前，在电场计算领域所开展的工作相对较少，而且仅限于传统边界元方法的应用；在计算流体力学领域，近年来虽然一些学者应用边界元法，在解决定常、不可压缩等问题进行了相当深入的研究，获得了若干研究成果，但是对于像SF_6高压断路器灭弧室中存在的非定常、可压缩、非线性、跨音速、具有复杂而且变边界的气流场由于至今尚未找到基本解，而未见研究工作的报道。

Main results are listed as below: 1. In rapid solidification, when the cooling rate is over some critical value, the solidification system will become unstable in the sense of the nonequilibrium thermodynamics, a uncontinuous steady state jump phenomenon will occur, and this uncontinuous steady state jump can be understood as the glass transition.

主要得到了如下结果：(1)通过对快速凝固过程的动力学及热力学的分析，提出了非晶转变的分枝理论模型，结果表明，对一合金熔体，当冷却速度大于某一临界值时，凝固体系会出现非平衡热力学意义上的失稳而出现多定态分枝现象，这一多定态现象可以被理解为非晶转变。

In the case of a call, this is the highest underlier value achieved, so the call has a payoff equal to the greater of: zero or the difference between that highest value and the fixed strike.

一种是行使价在期权到期时才确定：看涨期权的行使价定为有效期内标的资产所触及的最低价格，看跌期权则定为有效期内所触及的最高价格。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。