Modeling of 3-D Vibration of Engine Crankshaft& Base on Quadratic Timoshenko Beam Element

Stress Analysis of Connecting Rod in Diesel Engine by Isoparametric Quadratic Boundary Element Method

柴油机连杆应力二次等参边界无数值分析

Inviscid three-dimensional extreme free surface wave motions in infinite water-depth are simulated using a novel quadratic higher-order boundary element model ( HOBEM) based on potential theory.

基于无旋、不可压的势流理论，利用高阶边界元法建立了一种可应用于无限水深的无粘三维完全非线性数值波浪水槽。

It was shown that Compared with finite element method, boundary element method is more accurate, needs less cpu time and data preparation, especially with isoparametric quadratic element.

结果表明，边界元法分析活塞温度场，不仅计算准备工作量比有限元大为减少，而且精度高、计算时间短，尤其采用二次等参元后，其优点更加突出。

The calculation of stress around the opening of a dam by the program indicates that the quadratic boundary element method has a wide range of applications with high precision.

计算实践表明：二次边界元法有广阔的应用范围及较高的计算精度，且计算准备工作简单，方便易行，程序可在水电工程中推广使用。

Numerical experiments show our AMG method is robust and efficient for solving the quadratic Lagrangian finite element system.

数值实验表明这种代数多重网格法对求解二次拉格朗日有限元方程是健壮和有效的。

Scalar Mode Analysis of Optical Fibers by Means of the Finite Quadratic Element Method

有限二次单元法光纤标量模式分析

Internal forces of elastic structures are calculated by using three-node quadratic boundary element method in which displacement and traction at elastic structures' boundary are more accurately depicted.

采用更精确地反映弹性结构边界上的面力分量和位移分量的三结点二次边界单元法求解弹性结构在边界上的位移和面力。

The surface Helmholtz integral equation dispersed by quadratic iso_parametric element is used as computation equation. Extensive work has been performed to overcome boundary integral equation in acoustic problems, non_uniqueness of solution and singular integral kernels.

以二次等参元离散的表面Helmholtz积分方程作为计算方程，采用一系列数值处理技术，克服了表面Helmholtz积分方程求解声学问题时出现的解的不唯一性和积分函数奇异性。

A Kind of Two-dimension Code word Structure of OCDMA System and Fiber Bragg Grating En-/ De-coder

一种OCDMA二维码字结构及光纤光栅编/解码器

Two-dimension bar code is a latest automated recognition technology developed from one-dimension bar code, which is widely utilized in many countries.

二维条码技术是在一维条码基本上发铺起来的应用范畴非常普遍的一种新兴自动识别技术，在世界各国中得到重视和推广应用。

Through update FPGA logic and system software, this platform can support two-dimension code, RFID card and Security control functions, which prove the advantages of SoPC technology& soft/ hardware reconfigurable and platform reuse-able.

另外，通过对升级与更改FPGA硬件逻辑以及系统软件，可使系统平台支持二维条码扫描、RFID卡读写，门禁控制等功能，实现了软硬件体系的可重构与平台的可重用。

Synthetically using the two-dimension bar code technology, bluetooth technology, digital imaging technology, micro-controller technology, flash memory technology, LCD and touch screen technology, a goods delivery confirmation system is invented and a portable information collection device is designed to gear to the modern logistics.

在此基础上综合运用二维条码技术、蓝牙技术、数字成像技术、微控制器技术、闪速存储器技术、液晶显示技术和触摸屏技术，设计并开发了适应现代物流运行需要的掌上物流数据采集器。

Identity authentication system based on fingerprinting and two-dimension bar code technology

基于指纹识别和二维条码技术的身份认证系统

University large equipment and instrument information management system based on two-dimension bar code technique

基于二维码技术的高校大型仪器设备信息管理系统

Using encryption algorithm to encrypted the data, and then using the QR two-dimension bar code to express the encrypted data can enhance the security of data.

利用加密算法对数据加密，然后将加密数据使用QR二维条码表示，可以增强数据的安全性。

According to the sample information security requirements of material intelligent system, analysis of the commonly used two-dimensional bar code character, determined the design plan which using QR two-dimension bar code as a power plant sensitive information carrier.

论文所做的主要工作有：1.根据物料智能采制系统中样品信息安全性需求，分析了常用的二维条码的特性，确定了选择QR二维条码作为电厂敏感信息的载体的设计方案。

Creating and distinguishing software of two-dimension bar code

二维条形码生成与识别软件

Two-dimension bar code is higher level of one-dimension. Base on the characteristic of ISO-417 about two-dimension bar code, this thesis explains some coding and decoding algorithm of text compact mode, byte compact mode and digital compact mode, and shows program scheme.

二维条形码是一维条形码的升级，本文根据国际四一七二维条形码的特点阐述了文本压缩模式，字节压缩模式和数字压缩模式的编码算法及译码算法，并给出了程序框图。

Especially two-dimension code has a wide range of applications in transport and logistics, identification, advertising, marketing and e-commerce and many other aspects, it is the most economic, practical automatic identification technology.

尤其是二维码在物流运输、身份识别、广告行销和电子商务等很多方面具有广泛的应用，是目前最经济、实用的自动识别技术。

The paper describes the background knowledge as well as the anti-counterfeiting technology of two-dimension code, and introduces terms, techniques and related algorithms.

论文首先介绍了背景知识以及二维码防伪技术的现状，之后介绍了课题中涉及的相关术语、技术以及相关算法。