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Secondly, the factors that effect performances of forging hydraulic press, such as high velocity, high stability and accuracy, are investigated.

其次研究了影响锻造液压机的快速性、平稳性及控制精度的因素，研究了阀组开关特性对系统性能的影响。

Secondly,the main formal models and methods of system are analysed.

其次 ，分析了几种主要的系统形式化模型和方法。

Secondly, it is the semantic interpretation of formalized system.

其次是形式系统的语义解释。

Secondly,a mixture of acetone and methyl formate was added into the methanol solution of sodium methoxide to prepare sodium formyl acetone by Claisen reaction.

以金属钠为原料，甲醇为溶剂，先制成甲醇钠的饱和甲醇溶液，再滴加丙酮和甲酸甲酯进行Claisen酯缩合制得丁酮烯醇钠，最后在强酸作用下与甲醇进行缩醛化反应合成了4，4-二甲氧基-2-丁酮，过程总收率达到73.1%，纯度98.7%。

Secondly we are not just introducing Nero, but also the characters that make up his world and a new setting for the series with the town of Fortuna.

第二我们不光是引入Nero，还有其它许多人，这使整个Fortuna世界变得更完善。

Firstly, the equation for stress intensity factors under static uniform pressure is used as the reference case, and then the weight function for a thick-walled cylinder containing a radial edge crack can be worked out. Secondly, the dynamic stresses in uncracked thick-walled cylinders are solved under internal impulsive pressure by using mode shape function method. The solution consists of a quasi-static solution satisfying inhomogeneous boundary conditions and a dynamic solution satisfying homogeneous boundary conditions, and the history and distribution of dynamic stresses in thick-walled cylinders are derived in terms of Fourier–Bessel series. Finally, the dynamic stress intensity factor equations for thick-walled cylinder containing a radial edge crack subjected to internal impulsive pressure are given by dynamic weight function method.

首先采用静态内压下的应力强度因子作为参考解，得到了带径向边裂纹厚壁圆筒的权函数；然后用振型函数方法推导无裂纹厚壁圆筒在冲击内压下的动应力响应，分析中将相应的弹性动力学方程解分为满足非齐次边界条件的准静态解和满足齐次边界条件的动态解的叠加，利用傅立叶-贝塞尔级数展开，推导出了厚壁圆筒内动应力的响应历程和分布规律；最后由动应力权函数方法导出带径向边裂纹厚壁筒在冲击内压下的动态应力强度因子计算公式。

First, the physical models associated with dislocations and cracks are respectively converted to mixed boundary value problems in mathematics. Secondly, by using the Fourier transform, a dual integral equation for a crack and an algebraic equation for a dislocation can be derived from the boundary conditions relating with a crack and a dislocation, respectively. Solving these equations, exact analytical solutions can be obtained in terms of Bessel functions in close-form.

先把位错和裂纹的物理模型写成与它们相关的边值问题，然后，利用Fourier变换将这些边值问题化成一个对偶积分方程(对位错而言，得到一个代数方程)，求解此对偶积分方程，可以获得以Bessel函数给出的封闭形式的分析解。

Secondly, the difference of two Gaussians receptive field between fractional and integral differential of digital image was discussed in view of signal processing and biologic vision nerve model respectively.

计算机数值实验结果表明，对于纹理细节信息丰富的图像信号而言，分数阶微分对灰度变化不大的平滑区域中的纹理细节信息的增强效果明显优于整数阶微分运算。

Secondly, several common ARMA models and ARCH models are introduced in detail, and fractionally integrated models, such as ARFIMA and FIGARCH, which are developed in recent years, are introduced, too.

然后介绍了几种常用的ARMA模型和ARCH模型，其次重点介绍了近几年刚刚发展的分整模型，即ARFIMA模型和FIGARCH模型，并对其进行比较分析，指出这些模型的不足和适用范围。

Secondly, it discusses the impacts of REI on the world economic spatial fram.

其次，探讨了区域经济一体化对世界经济空间结构的影响效应。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。