查询词典 splitting

The results showed that the catalyst, with calcium phosphate as the main part, is active and selective in the splitting of acetal.

实验结果表明：以磷酸钙为主体的催化剂对缩醛裂解反应具有较高的活性和选择性。

You've got a splitting headache, but luckily there's acupressure!

你头痛得快炸了，幸运的是现在有一种镇压法。

Image segmentation ; active contour model ; variational calculus ; level set methods ; additive operator splitting scheme

图像分割；活动轮廓模型；变分方法；水平集方法；可加算子分裂算法

Following by the idea of discontinuous right-hand sides in SIDEs, the whole framework is studied based on the spring-mass model, and some good properties are given. Furthermore, two schemes are presented: explicit scheme and additive operator splitting scheme.

借助SIDEs不连续右端的基本思想，将整个框架在弹簧体模型下进行考虑，给出了一些好的性质，并时该扩散方法提出了两种数值求解方案：显式方案和可加算子分裂的迭代格式。

Using an airgun as a repeatable seismic source and recording the data at a fixed point, the variation of shear wave splitting parameters can indicate the variation of local stress-strain fields, and hence provides a method for earthquake stress-forecasting.

气枪是高度可重复性人工震源，利用气枪定点激发和定点接收有可能精确获取S波分裂参数随时间的变化规律，为地震预测探索实践提供可靠的物理途径。

Main contributions and achievements are as follows:A general non-equilibrium rigorous model for RDP is developed in this thesis. Based on the pseudo-homogenous assumption, two main factors reaction and separation are de-coupled, and an RDP model with the same format as that for a traditional distillation process is established. To solve the model with a large number of algebraic equations, modified M-K equations with tri-diagonal matrix form are developed based on the improved Separation Efficiency Functions, which greatly increases the iteration efficiency. This thesis also develops a general reactive distillation dynamic model. Through splitting of the differential variables based on SEFS, large-scaled differential algebraic equations can be solved with the improved Gear's algorithm which makes the dynamic model suitable for the on-line application. A simulation platform for the control loop design and evaluation of RDP by introducing control system equations into the dynamic model is also developed.A lactic acid purification pilot-scale RDP is investigated.

论文对热点问题——反应精馏过程的建模与优化控制相关技术进行了深入的研究，取得了一系列成果：1、建立了反应精馏过程机理模型，基于拟均相假设，将反应和分离过程进行解耦，推导出反应精馏过程的非平衡级稳态模型和动态模型，通过引入推广的分离效率函数，对模型变量进行了合理划分，显著提高了模型求解效率；将动态模型和控制系统方程结合，建立了反应精馏过程控制系统研究的辅助工具。2、全面分析了乳酸提纯反应精馏新工艺试验装置，利用本文建立的过程机理模型，对该试验装置进行了稳态和动态性能分析及水力学核算；设计和分析了单边质量控制方案，比较了间接和直接物料平衡控制两种方案的控制性能。

But it demands the higher computational accuracy. Time-dependent LU-SGS method and close coupled full implicit finite volume scheme are used. The AUSMPW+ based on the three-order MUSCL difference scheme is used for the inviscid operator, and the maximum eigenvalue splitting method is used to convert matrix operation to algebraic operation in order to shorten the computing time.

运用时间相关的LU-SGS方法，采用强耦合的全隐式有限体积进行离散，其中无粘对流项采用三阶MUSCL型差分的AUSMPW+格式，并应用最大特征值分裂，将矩阵运算转化为代数运算，大大缩短了计算时间。

Based on the Jones matrix method and the reflect characteristic of coating film on mirror, the physical model of polarizing beam splitting in altazimuth Coudé telescope is built.

基于镜面膜层复振幅反射特性，采用琼斯矩阵描述方法，建立了偏振分光物理模型，研究了共孔径发射和接收偏振耦合分光的效率问题，并与实验结果进行了比较。

In the experiments of Rayleigh laser guide star for adaptive optics on altazimuth Coudé telescope, the technology of LGS launched and received in the common aperture using polarizing beam splitting scheme is researched.

在地平式折轴望远镜上开展自适应光学瑞利激光导星实验，研究了信标光束同孔径发射和接收偏振分光技术。

The physical model of polarizing beam coupling and splitting system using altazimuth coude telescope is built up based on Mueller matrix and Stokes vector. The phenomena of the decreasing of the receiving efficiency are successfully explained by this model. Three dynamic phase compensation solutions are proposed: 1 Two quarter-wave plates are rotated to compensate the phase of the laser.

针对这个问题，建立了地平式折轴望远镜的共孔径偏振耦合分光模型，用Stokes矢量和Mueller矩阵分析了在望远镜旋转过程中激光偏振态的变化，数值模拟计算了望远镜处于不同方位角和天顶角时的偏振耦合分光效率，解释了实验中观察到的望远镜旋转导致偏振耦合分光效率退化的现象。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。