简便

In this paper,the aqueous solution polymerization of acrylamide by using copper chloride/ethylene diamide/α chloroethyl benzene as an initiator was studied. Molecular weigh has a correlation of a straight line with the time.

原子转移自由基聚合是一种自由基"活性"聚合，自发现[1 ] 以来已应用该技术合成了一系列结构不同、性能各异的聚合物材料[2～ 3] ，并发展了多种ATRP引发体系，是活性聚合发展史上最简便的一种技术。

With the characteristics of high accuracy, easy to operate and sensitive, the method is applicable for dichloromethane determination in workplace.

该方法准确度高，操作简便，灵敏，适用于工作场所空气中二氯甲烷的测定。

This method can separate efficiently and determine dichloromethane and dichloroethylene accurately in the water and only takes 4.2 minutes.

方法仅用4.2min完成饮用水中二氯甲烷和二氯乙烯的分离和测定，操作简便、灵敏。

The conformation of sericin was studied by circular dichroism and infrared spectrum analysis.

研究结果表明，低温乙醇沉淀法是一种简便有效提取丝胶的方法。

Sufficient conditions guaranteeing the synchronized behavior are obtained without assuming the boundedness and differentiability of activation functions.

在设计同步控制的时候，没有假设激励函数的有界性、可微性和单调性，给出的条件简便易实施。

Therefore, the method is a simple workable one for calculation of soil water diffusivity.

因此，三次样条函数法是计算土壤水分扩散率的一种简便可行的方法。

Abandoned stope disposal is a technological problem widespread in the mining field in our country. In this thesis, according to the condition of Mujia Hill, the method of roof cutting and ore pillar dilapidation is proposed.

采空场处理是我国普遍存在的采矿技术难题，开展空场处理研究，发展经济合理、技术可行、简便适用的空场处理方法，即迫在眉睫，又具有重大的社会、经济意义和学术研究价值。

New ideas and methods in the paper:1 The formulas on perforated casing collapse strength were deducted, which offereda convenient method to analyze the relationship between casing collapse strength and perforation;2 The stress and displacement formulas on the system of casing, cement anddeformation under the non-uniform load were deducted, which offered the theoretical found for designing optimally casing string;3 The relationship between structure in-situ field of whole oil field and casing failurewere studied, which offered the scheme for the prediction of casing failure. The process of study in the paper:1 For simulating the relationship between the structure in-situ field and the casingfailure in the oil-deformation, the tests of the uniaxial tensile, compress, tnaxial compress and dilatability were made on the samples of the drill cores from deformation of casing failure position in Yuejing II oil field.

本文的主要创新： 1推导出了射孔套管抗挤强度的解析式，为分析射孔与套管强度的变化关系提供了简便的方法； 2推导出了非均匀地层载荷作用下套管、水泥环和地层组合体的应力和位移解析式，并非均匀作用下套管柱优化设计提供了理论依据； 3研究整个油田区块构造应力场与套管损坏关系，为预测套管损坏提供了可行方案；本文的研究过程如下： 1为模拟构造应力场与油层段套管损坏关系，做了大量的岩石单轴抗拉、单轴抗压、三轴试验以及岩石遇水膨胀试验，获得了研究区块岩石的弹性模量、泊松比、内聚力、内摩擦角以及岩石的线膨胀系数，这此数据为本文研究油层段套管损坏机理研究的理论分析和有限元法提供了实验数据。

As to the treatment of hypospadia,new hypospadia dilator has the characteristics of being short and small,and convenience,straight line of expanding force,bigger expansion ability and greater safety.

新型尿道下裂扩张器，针对尿道下裂的治疗，具备短小，简便，扩张力线直和移行扩张力度、安全度大的特点，大大增加了扩张治疗的安全性。

Generally speaking, a new and simple way of predicting the infinite dilution activity coefficient was suggested in this paper.

总之，本文的研究工作对于无限稀释活度系数的预测又提出一种新型、简便的预测方法。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。