查询词典 stokes

Integrating Navier-Stokes equations with overfall model, this dissertation firstly applied CFX5. 5 solver and full coupling arithmetic to simulate air flow in flow field plates, and evaluated water management of six kinds of flow channels, the results of simulation and analysis were verified by experiments.

本文首次结合Navier-Stokes方程与湍流模型，采用CFX5.5求解器及全隐式耦合算法对对流场板内的空气流动进行了数值模拟，对不同流场板进行了水管理评价，并得到了实验的证实。

A fourth-order compact finite difference alternating-direction-implicit algorithm is proposed for solving the unsteady-state Navier-Stokes equations of fluid flow and heat transfer using the streamfunction-vorticity formulation. Point-successive overtaxation iteration is used to achieve the steady solutions.

本文构造了求解二维非定常涡量流函数形式Navier-Stokes方程组的一种四阶紧致交错方向隐式差分算法，对包括能量方程在内的离散化方程组采用逐次超松驰迭代法求得稳定解，求解了二维非定常粘性不可压缩流体的流动与传热问题。

Because this equation has the character of parabolic type in mathematics, it could provide a very accurate and powerful tool for computing fluid mechanics and heat transfer characteristics in micro-tubes after fully developed region. At the time being, comparing with the general computer devices, simulating the program is much faster than the traditional Navier-Stokes equation hundreds of times.

这个边界层方程式因为具有抛物线型的数学特性，用於计算流道内完全发展后的流力与热传特性，能够提供一个准确又有力的最佳工具，就现今较普遍的电脑硬体设备来说，在模拟分析花费的时间比传统的Navier-Stokes方程式所需要时间还要快几百倍以上。

First, based on coupled wave equations of interaction between pump field. stokes field, acoustic field in SBS processing under stable station, theoretic characteristic parament of SBS are induced, such as gain, threshold, and condition of effective SBS interaction.

首先由受激布里渊散射过程的泵浦场、斯托克斯场和声子场三波相互作用的耦合波方程组，推导出了稳态SBS过程的增益指数、阈值增益，及产生有效SBS相互作用的条件。

Phycoerythrin is an excellent fluorescent dye because of its high fluorescence quantum yield and large stokes shift.

藻红蛋白的斯托克位移大，荧光量子产率高，荧光明亮，是一种应用前景广阔的荧光染料。制约藻红蛋白应用的主要因素是分离纯化困难及其成品售价昂贵。

In this chapter, three kinds of target recognition methods are performed, which are:①Target recognition method based on the description of polarization parameter plane. The echo polarization states of target are projected onto the polarization state plane described by the ellipticity ε and the tilt angle τ of the polarization ellipse, the change of parameter following ferquency becomes the chart. According to the changing trait of the chart, the multidimensional polarization feature space of target has been contructed. Furthermore, a series of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.②Target recognition method based on the description of Poincare polarization sphere. The echo polarization states of target expressed by Stokes vector are projected onto the Poincare polarization sphere. The conception of polarization ferquency stability, which is used in describing the dynamic distribution characteristics of the target echo polarization states on Poincare polarization sphere, has been defined. A group of polarization feature parameters used in designing the structure of target recognition device are extracted, and they are insensible to the posture of target.③Target recognition method based on the description of frequency sensitivity. In accordance with the conception of the polarization state distance defined on Poincare polarization sphere, the frequency sensibility of the physical structure property of target has been investigated, the frequency distribution feature curves in PSD domain are obtained, and targets'features are extracted by means of the curve-fitting method with Least Square Criterion.

这章具体研究了基于三种极化散射特性描述的相应的目标识别方法：①基于极化参数平面描述的目标识别方法，将目标回波极化状态投影到以极化椭圆参数，即椭圆率角ε和倾角τ表征的极化状态平面上，参数随观测频率的变化就形成了图，根据图的变化特点构造了目标的多维极化特征空间，并提取了不敏感目标姿态变化的极化特征参数组来设计目标的识别器结构；②基于Poincare极化球面描述的目标识别方法，采用Stokes矢量表征目标回波的极化状态，并将其投影到描述极化状态的Poincare极化球面上，定义了极化频率稳定度的概念用以刻画目标回波极化状态在Poincare极化球面上的动态分布信息，提取了准方位不变性的目标极化特征，最后设计了目标的识别器结构；③基于频率敏感性描述的目标识别方法，通过在Poincare极化球面上所定义的极化状态距离的概念，研究的是复杂目标物理结构特性对探测信号频率的敏感程度问题，获得了在极化状态距离下的频率分布特性曲线，采用最小二乘估计曲线拟合方法，它既用于极化特征的降维，同时又直接将拟合参数作为目标的分类特征。

Furthermore, the optical electron polarimeter based on the Stokes parameter measurement also has been developed in this dissertation.

这些实验探索为我们进一步的研究工作提供了极为宝贵的经验。

We have finished all the parts of the optical electron polarimeter, including the analysis system for the Stokes parameters of radiation fluorescence, photon detection system, and electronic system etc.

所完成的工作包括真空机械系统、辐射荧光Stokes参数分析系统、光探测系统、数据获取电子学系统等。

A set of new method to deduce vector magnetic field from Stokes parameters for FeI 1 .56~Arn zeeman-sensitive lines is put forward, and the deduced results from our infrared polarimeter are compared with those from Huairou Solar Magnetic Field Telescope.

同时建立了一套从 Stokes参量反演磁矢量场的方法，并将反演的结果与怀柔太阳磁场望远镜的观测结果进行了比对。

Carleman不等式及其在最优控制问题中的应用.Optimal control theory of distributed parameter systems mainly includes: Pontryagin's maximum principle; controllability; Hamilton-Jacobi equation (i.e., dynamic programming equation); time optimal control, etc.In this dissertation, we establish Pontryagin's maximum principle of optimal control problems governed by some nonlinear differential equations (parabolic differential equations, elliptic differential equations and 3-dimensional Navier-Stokes equations), which in particular could have local solut...

在这篇博士论文中，我们建立了非线性微分方程(包括抛物型微分方程，椭圆型微分方程以及3维Navier-Stokes方程)最优控制问题的庞特里雅金最大值原理，特别地，这些方程可能只有局部解或存在多解(我们称这样的系统为非适定系统，相应的最优控制问题为非适定最优控制问题)，以及适定的非线性发展方程最优控制问题的庞特里雅金最大值原理；我们研究了phase-field系统的时间最优控制问题以及Boussinesq系统的局部内可控性。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"