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Preparation method of perfluorooctane based on n-octane and anhydrous hydrogen fluoride as starting materials via electrochemical fluorination is described in detail finally.

介绍了全氟辛烷的性质和用途，列举了合成全氟辛烷的各种工艺路线，最后较为详细地论述了以正辛烷和无水氟化氢为原料，通过电化学氟化法制备全氟辛烷的工艺过程。

In the first chapter of this thesis, we prepared the desired β-amino acid ester starting from 1-tridecanol and converted it to the corresponding γ-amino alcohol via LAH reduction and hydrogenolysis.

在论文的第一章，我们从十三醇出发，以S型苄基保护的α-甲基苄胺为手性源，经过多步反应制得光学纯的β-氨基酸酯衍生物。

Amino alcohol via LAH reduction and hydrogenolysis.

经过LAH还原和氢解作用得到了-氨基醇。

An alternative way of the synthesis of methanol from syngas is low-temperature methanol synthesis via methyl formate in liquid phase, namely, carbonylation of methanol in the first step, and hydrogenolysis of methyl formate in the second step.

低温液相甲醇合成是指在（80-160℃）范围内，甲醇首先与合成气中的CO发生羰基化反应生成甲酸甲酯，甲酸甲酯再氢解生成甲醇的两个反应在一个反应器内串联进行的方法。

Preparation of ZnO micro-nano composite hydrophobia film via three-step method ;2. In this paper basic steps of structural dynamic damage detection are discussed and a three-step method for structure damage diagnosisis proposed.

以位于广东新会的崖门桥(双塔刚构体系预应力单索面混凝土斜拉桥)为工程背景，探讨了结构动力损伤识别的基本步骤以及利用结构动力损伤识别三步法对大型工程结构进行损伤识别的有效性。

Although it is proved via a hyperbolic symmetric system,some especial contents from Poisson equation are to be dealt with.

尽管主要的思路是将原系统转化为一个对称双曲系统来处理，但一些来于Poisson方程的具体内容仍需要考虑。

However, the solutions of the Cauchy problem of the nonlinear hyperbolic system generally develop singularities in finite time even if the initial data are small and smooth.For this reason, solutions must be found in the space of discontinuous functions. Therefore, one can not directly use the classical analytic techniques that predominate in the theory of partial differential equations of other types. Instead, we construct approximate solutions via the singular perturbation methods. By using the compactness of the approximate solutions, we can obtain the existence of the solutions of original system.

然而一般而言，即使是在初值很小且光滑的情况下，非线性双曲型守恒律的Cauchy问题的解在有限时间内也会出现奇异性，为此，我们必须在不连续函数空间中寻找上述问题的解，因此对这类问题的研究，我们也不可能直接利用在其它类型的偏微分方程中占主导地位的解析方法来解决问题，而是通过奇异扰动法构造近似解，由近似解的紧性得到原问题解的存在性。

The installation of drivers VIA Hyperion 5.11a did not solve the problem .

安装驾车途经5.11aHyperion系统并没有解决问题。

Discussion and exploration of cultural topics in their current social, political, and historical context via hypermedia documentaries.

通过超媒体文本讨论和探究它们当时的社会、政治和历史背景下的文化课题。

This a obtains method maximum separation ratio to separate two classes instances via a single hypersphere and also provides the facility to control the upper bounds of two classes error rates respectively with two parameters. As such, the performance of classification and prediction of imbalanced data sets can be improved, and the range of selection of parameters can be greatly narrowed.

该方法通过一个超球面将两类数据以最大分离比率分离，并且引入两个参数来分别控制两类错分率的上界，不仅提高了不平衡数据集的分类和预测的性能，而且大大缩小了参数的选择范围。

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％。