查询词典 finite difference approximation

Firsdy, using the linear matrix inequality method and the concept of finite-time boundness, some sufficient conditions of finite-time boundedness for the linear discrete systems with uncertain exogenous disturbance were derived.

针对一类不确定线性离散系统有限时间观测器最优设计问题，利用线性矩阵不等式方法以及有限时间有界的概念，给出了具有不确定外部扰动输入的线性离散系统有限时间有界的充分条件。

In this paper,I regard this bridger as the actual engineering background,and make a finite element analysis to the anchorage zones of cable support tower and girder by making use of the big current finite element software of ANSYS.

本文即以武汉天兴洲大桥为实际工程背景，利用大型通用有限元软件ANSYS对大桥的索塔锚固区、索梁锚固区以及公路桥面板的钢混结合段进行有限元计算分析，主要工作内容及成果如下

Results show that to assign skeleton to 2 kinds, i.e. compact bone and cancellated bone, could not match the needs for a personalized finite element analysis; and to assign skeleton to 10 kinds of material attributes to three-dimensional model of femur could match the needs for finite element analysis.

结果提示，传统方法将骨骼分成密质骨及松质骨2种材料属性，不能满足个性化骨骼有限元分析的要求，将骨骼赋予10种材料属性即可达到有限元分析的要求。

Group of finite element analysis was divided into 2 kinds(compact bone and cancellated bone ), 10, 50, 100, 200, 400 kinds of material attributes groups based on the gray value. All models were assigned with material attributes and tested in ansys for mechanics datas of nodes on surface of femoral neck. In group of biomechanical testing, twelve specimens of femoral superior segment were treated with compressed testing to harvest mechanics datas of measuring point same as that of group of finite element analysis. Results One-Way ANOVA showed as follows.

有限元分析组在Mimics中根据灰度值将三维模型材料属性分为2种、10、50、100、200、400种后赋予材料属性，在Ansys中进行力学分析并采集股骨颈表面节点力学数值；体外力学试验组将12侧股骨上段标本进行压缩试验，采集与有限元分析组相同测试点力学数据。

In this paper, we study the relations between n-absolutely pure modules and n-flat modules and define finite present n-flat modules and finite copresent n-absolutely pure modules.

一绝对纯模和二一平坦模的关系作了进一步的讨论，并定义了有限表现。一平坦模与有限上表现的。一绝对纯模，进而讨论了他们之间的Morit时偶性质。

Methods One normal adult male was choosed, and his left elbow joint performed in pronation and extention position was scanned by spinal CT, and the two-dimensional image was dealed with Mimics 1 0 software, the three-dimensional finite element model was built up by Abaqus 6.7 software. Finite element calculation was performed to simulate the impact of 1 000 N on the elbow joint, and the stress distribution in the radial head and coronoid were analyzed.

选取1名正常成年男性为研究对象，使其左肘关节处于旋前伸直位，行螺旋CT断层扫描，得到CT数据二维图像，采用Mimics 10.0软件系统处理，利用Abaqus 6.7建立肘关节三维有限元模型，模拟施加1000 N冲击载荷，分析冠状突及桡骨小头内应力分布情况。

The limitations of finite-memory programs, closure properties for simplifying the job of writing finite-memory programs, and decidable properties of such programs are also studied.

有限记忆程序的局限、简化编写有限记忆程序的闭包性质和有限记忆程序的可判定性在本章也被探讨。

To achieve the program of finite element, which apply to the two-dimensional temperature distribution of high power laserAccording to the diathermanous principles and the thoughts of finite element, the temperature distribution of the chip and the submount of high-power laser were simulated in the work.

2实现了适用于大功率半导体激光器二维温度场的有限元程序根据传热学的基本原理和有限单元的思想对大功率半导体激光器的芯片和载体的温度场进行计算机模拟了，最终求解出了总体温度刚度矩阵K_总和总体边界条件矩阵P_总，进而求解出各个节点的温度值T。

In this paper, the research object is the XM18 spherical generator, in order to improve the dynamic behavior of the machine tool, the following aspects have been studied in this thesis: Firstly, based on the elasticity theory and finite element analysis theory, the finite element models of the lathe bed, dovetail, dovetail shelf, headstock, fanlike plank and millhead shelf, which were the main parts of the spherical generator, were built up using ANSYS9.0. And based on the modal analysis theory and FEM technology, the free modal and the constrained modal analysis of the main parts were studied. Accordance to the analytical results, put forword methods to optimize the key parts.

本课题以XM18球面铣磨机为研究对象，为了提高其动态特性，本文主要从以下几个方面进行研究：首先，根据弹性力学理论和有限元分析的基本理论，利用ANSYS9.0软件建立了铣磨机的主要零部件床身、燕尾、燕尾座、主轴箱、扇形板和磨头座的有限元模型，利用有限元法对主要零部件进行了自由模态和约束模态分析，并根据分析结果对关键部件提出了改进方案。

The joint inversion of some geodynamical parameters and numerical simulating the crustal stress field is presented in this paper. The four nodes quadratic finite element in Chinese area is constructed and the "split node" technique is employed for introducing the fault parameters into the finite element computation.

讨论了利用地应力主方向和GPS资料联合反演与之相关的地球动力学参数及数值模拟地壳应力场的方法，建立了中国及其邻区的四节点有限元模型，解决了有限元数值解算中节点位移不连续的问题。

We were cousins—his grandfather was King of Scots,and his great-grandfather was Henry VII of England.

我们是堂姐弟——他的祖父曾是苏格兰国王，他的曾祖父是英格兰的亨利二世。

I do want to help you, but I am in a quandary now!

我是想帮你，但是我现在左右为难啊！