查询词典 computational

To use symbolic and algebraic computation techniques for studying the computational properties of procedure schemes, some convergent procedure schemes are investigated in algebraically closed field and real closed field.

过程模式在代数闭域和实闭域上的应用：本文在代数闭域和实闭域上研究了收敛过程模式，设计了用于自动推理的过程模式，并且用其解决微分动力系统研究中的中心-焦点问题。

In the course of algorithmization, we should select arithmetic with high numerical stability and controlling error and computational effort little and saving memory space.

建立模块化仿真模型时，本文通过模型算法的模块化平台一仿真支撑系统BLINK，把算法进行单独的模块太原理工大学硕士学位论文化处理，通过算法来构造仿真模块，实现模块的搭建和组合。

The above mentioned calculation methods is to put alphabetic string into sections by means of a certain characteristic characters or character serials, and then match every subsection respectively, whose computational quantity is approximate to O.

本发明所描述的算法是对字符串先按某种特征字符或字符序列进行分段，然后分别匹配各个子段，运算量近似于O，从而大大降低了运算的复杂度，提高了运算速度。

The combination of analytic and numeric method s is an important approach to enhance computational efficiency.

解析方法与数值方法有效融合是提高计算效能的重要途径。

The computational mesh,is generated automatically in terms of analytical/numerical transformation.

由于有限元法在处理复杂边界时的灵活性，近年来正迅速发展成为求解跨音速流场的强有力工具。

The experimental setup for the turbulent jets in crossflow is designed, and the hot wire anemometry IFA 300 is used to measure the velocity field and the turbulent kinetic energy, and the computational result matches experimental measurement reasonably well. The experimental result is very important in the analysis of the flow field, deduction of the equation of the jet trajectory, check of the turbulence model and validation of the numerical method.

首先，建立了用于测量横向紊动射流的实验台，并利用IFA 300型热膜风速仪系统测量了多种工况下的流场，并将速度、湍动能结果与数值计算结果进行了比较，实验结果与数值模拟结果吻合较好，从而为分析流场特性、确定射流轨迹、比较湍流模型以及验证数值计算方法提供了依据。

An adaptive grid scheme controlling cell area is used to generated grids in the divergent section of symmetric annular nozzle, and the generated grids are used in the flowfield calculation through the uncoupled way. The elliptic equations are used to generate grids in three dimensional regions of FDN divergent section, the source terms used in the equations employ a mathematical form which is independent of the boundary shape and of the boundary grid point distribution, the free parameters contained in the source terms are determined by the two restraint conditions, the intersection angle of transverse grid lines with boundaries and the local curvature of the transverse grid lines at the boundaries, and the interior grid distribution controlled directly by the grid point distribution assigned on the boundaries is realized, it makes the grid more clustering near the nozzle wall. For the generated grids in the whole computational regions have a good smoothness and orthogonality, the accuracy of calculation in the flowfield is ensured.

对轴对称的环形喷管采用控制网格面积的自适应网格方法对扩散段部分进行了网格生成，并通过非耦合方式应用于喷管的流场计算中；对强制偏流喷管扩散段内的三维区域采用椭圆型方程进行网格生成，方程中的源项采用了与边界形状和边界网格点分布无关的数学形式，源项内的自由参数由横向网格线与边界的交角及横向网格线在边界处的局部曲率两个约束条件来确定，实现了由边界上的网格分布直接控制内部的网格点，使壁面附近具有较密集的网格，并且在整个计算区域内的网格都具有良好的光滑性和正交性，从而保证了流场计算的准确性。

In this thesis,based on the DFT+NEGF first-principles method,we construct a lead-molecule-lead sandwich system with single benzene-based molecule to investigate the relationship between the structure and properties of the molecular devices and the factors that influence properties of the molecular devices.Our computational investigations on these molecular devices are primarily concentrated on the effect of contact geometry between molecules and electrodes,the effect of side groups,the effect of different torsion angle between two phenyl rings and the effect of external electric field.This thesis consists of five chapters:In Chapter one,we mainly introduce the research background and development of the molecular electronics,including the experimental fabrication of molecular electronic components and theoretical simulation methods.Afterwards we discuss the questions that need to be solved in this area.Finally,the main contents of this thesis are listed.In Chapter two,we introduce the theoretical methods used in this thesis, including the main first-principles calculation methods,i.e.,the Density-Functionmethod and nonequilibrium Green\'s function.

本论文拟采用密度泛函理论和非平衡格林函数相结合的第一性原理计算方法，选取苯基小分子作为研究对象，构建了金属电极/有机小分子/金属电极三明治结构体系，系统地研究了苯基分子器件结构的改变与分子电输运性质之间的关系以及影响分子器件电输运性质的相关因素，其中重点研究了分子与电极间可能的接触结构改变、官能团、分子间的扭转角以及外电场对苯基分子电输运性质的影响，本论文主要包括以下五个章节的内容：第一章为综述部分，主要介绍了分子电子学产生的背景、分子器件的研究意义、当前研究分子器件的实验和主要理论方法，以及目前在研究分子器件中存在的一些问题，最后给出了本论文的主要研究内容和技术路线。

The computational results show that the antiphase boundaries in the film have different properties with antiphase boundaries in the bulk.

计算结果表明反相畴界的薄膜系统中的性质与在体材料中的不同。

To satisfy the PDS antitype system requirements of ITS market,two systems are developed based on the computational classifier ensemble model.One is based on PC platform,which is used for offline algorithm verification,and the other one is based on a DSP chip,which is used for on-board pedestrian detection.

针对智能交通市场对廉价的行人检测原型系统的需要，本文在组合分类计算模型的基础上，分别完成了基于PC计算平台的行人检测算法离线验证平台和基于DSP的车载行人检测原型系统。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。