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By studying the membrane preparation process for the typical membrane materials of polystyrene and cellulose acetate as well as a new type membrane material of polyvinyl butyral,the effects of operating parameters on the membranes structure are determined.By the study on the thermodynamics involved in the ternary systerms of ScCO_2/solvent/polymer and the calculation of theoretical ternary phase diagrams,the phase demixing behavior during the membranes formation by ScCO_2 induced phase separation process are described.By studying thermodynamics involved in the quaternary systerms of ScCO_2/solvent/additive/polymer,the effect of a low molecular weight additive on the quaternary phase diagram and dimixing speed are revealed.

通过对传统膜材料聚苯乙烯、醋酸纤维素及新型膜材料聚乙烯醇缩丁醛进行ScCO_2诱导相转化制膜工艺的实验研究,给出了操作参数对膜形态结构的影响规律;通过研究ScCO_2/溶剂/聚合物三元体系热力学问题,并计算出相应铸膜体系的三元相图,对ScCO_2诱导相转化膜制备过程的分相成膜行为进行了分析与描述;通过研究ScCO_2/溶剂/小分子添加剂/聚合物四元铸膜体系的热力学问题,并借助于四元体系理论相图计算的结果,分析了小分子添加剂对相分离过程的影响。

The method amending atmosphere influence is introduced, which places large area gray body beside the target. After academic analysis and experiment research, it is found that the "black body demarcation curve" and "reference curve" intersect at the atmosphere temperature point, and the slope amending coefficient and offset amending coefficient could be calculated based this two curve. After corresponding amending on target gray, the infrared radiation characteristics could be calculated by rule and line.

介绍了通过放置在目标附近的大面源灰体修正环境影响的方法,经过理论分析及实验验证,发现"黑体标定曲线"和"参考曲线"相交于环境温度点,并且根据这两个曲线可计算出环境影响的斜率修正系数和偏置修正系数,对目标的灰度值进行相应的修正就可以准确地计算出目标的温度等红外辐射特性。

Based on the reasonable simplification and assumption for slewing ring in mechanical engineering, calculating the pressure on unit length of arc at any angle of raceway under different loads of slewing ring .

在对工程机械中常用的回转支承装置进行合理的简化和假设后,根据其受力状况,分别计算出作用在回转支承上的各种载荷对滚道圆周上任意角处单位弧长上所产生的压力,最后应用压力叠加的方法,推导出回转支承装置摩擦阻力矩的计算公式。

The some basic methods in composite mechanics are introduced,and relative formulations are derived.Maximum stress criterion,Maximum strain criterion,Hill criterion and Cai-Wu criterion are showed.The solid model of level-stability-panel is built by CATIA software,its finite element model by PATRAN/NASTRAN software.Through finite element analysis,the stresses and displacements of level-stability-panel are obtained.In order to analyze the strength of asingle part of level-stability-panel,the software CLOP is developed.The process of taking the data from NASTRAN's results and importing them to CLOP is showed.The strength of back wall of lev el-stability-panel is calculated by CLOP.

论文叙述了复合材料力学分析的基本方法,并推导了相应的计算公式,给出了几种常用的强度准则;利用CATIA软件对某型直升机的平尾进行实体建模,然后在PATRAN/NASTRAN软件中读入该模型,形成了有限元分析模型,并进行有限元分析,获得了平尾的应力云图和位移云图;为了对平尾的局部复合材料结构进行强度分析,开发了CLOP程序;从平尾结构中取出后樯作为强度分析的对象,表示了从NASTRAN分析的结果到CLOP程序输入的方法,计算出了后樯的强度数据。

When the stress and displacement fields in a specimen are calculated by finite element method, the stress intensity factors K and K of mixed-mode crack can be obtained immediately by a contour integral.

此方法与积分路径的选择无关,用有限元法计算出远离裂纹尖端的位移场和应力场,就可通过计算绕裂端的围线积分,精确地给出混合型裂纹的应力强度因子KⅠ和KⅡ的数值解。

The integrability conditions and coefficient conditions for the appearance of 5 and 6 limit cycles from the neighborhood of the equator are obtained. An example of cubic system with 6 limit cycles bifurcating from the equator is given for the first time.

同时计算出系统的前6个赤道环量,得到了系统在赤道邻域的可积性条件及在赤道附近分支出5个和6个极限环的系数条件,从而首次给出了一个平面三次系统在赤道附近分支出6个极限环的计算实例。

Using finite difference time domain method, the electromagnetic field distribution of THz wave is simulated in a THz 2D PC splitter and by plane wave expansion method the dispersion relation and defect modes are achieved in a THz rotated PC waveguide.5. A woodpile three-dimensional (3D) PC with face-centered-tetragonal symmetry is one of the most popular 3D PCs because of its favorable band gap characteristics. Based on the woodpile fct lattice structure, we propose a novel woodpile THz lattice structure with comparatively decreased symmetry, better band gap properties and easy fabrication by varying some structure parameters.

计算结果为利用非线性光学差频方法产生THz辐射源的实验研究提供了深入和全面的理论基础;四、利用平面波展开法,通过改变二维THz光子晶体的结构参数,对二维THz光子晶体完全带隙进行了优化,分析出两种适合工作在THz波段的二维光子晶体结构;采用时域有限差分法和平面波展开法,计算出THz波在二维光子晶体"T"型分束波导,45度旋转波导中传输的电磁场分布以及缺陷模;五、Woodpile面心立方四角结构是三维光子晶体中被研究最广泛的结构之一。

In the paper, the theory and methodology of amplitude correction method using average of several points in discrete spectrum, which is suitable for analyzing the dynamic signals of rotating machinery with small varying speed, is proposed and systematically studied.

系统而完整地提出了处理变速机械弱时变响应信号的离散频谱多点平均幅值修正法的理论和方法,严格证明了该方法能精确地计算出平稳信号和频率微弱波动信号的幅值,能近似地计算出幅值和频率均微弱波动的信号的平均幅值,并应用这套理论成功地解释了频率微弱波动信号的幅值谱表现出较严重的"功率泄露"效应的原

According to the complete geometric symmetry of the irons and windings, and the mirror symmetry during positive-negative operating-mode period, the expressions of current harmonics are derived, and the electromagnetic equitation are simplified. Based on this, the analytical calculation of flux density and the electromagnetic calculation of the reactor are performed.

根据两个铁心及绕组的结构完全对称以及它们工作状态在正负半周里呈镜像对称的特点,推导出电流谐波关系式,简化了本可控电抗器的电磁方程,并根据简化后的数学形式研究了其磁感应强度的解析计算,最终计算出了各项性能指标。

According to the field plot of TE10 wave mode in rectangular ridged waveguide,the equivalent capacitance and equivalent inductance are approximately calculated by quasi-static method,and the resonant frequency which is namely cutoff frequency is derived.

由矩形正脊波导中主模TE10波模的分布结构特征,用准静态方法近似的计算出等效电容和等效电感,从而计算出谐振频率,也就是矩形正脊波导的截止频率。

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I'm strongly against the death penalty — it's an eye for an eye.

我不赞成死刑——这是以牙还牙的报复行为。

And to get you the support you need, we're enlisting all elements of our national power: our diplomacy and development, our economic might and our moral suasion, so that you and the rest of our military do not bear the burden of our security alone.

并给你们所须的支援,我们正徵召国家所有各种的力量:我们的外交及发展,我们的经济力量与道德劝说,所以你们与其他军人不须要孤独地负起国家安全的责任。

Imagine yourself to be an actor in a play on the stage.

设想你自己是一个演员在舞台上表演。