利用几何画板模拟光拍的产生与传播

利用光拍现象来测量光速是一种新的实验技术．本文利用几何画板软件,对此进行了生动形象的模拟．通过对参数值的连续调节,动态地描绘光拍的各种形态,研究光拍的变化规律;给出光拍的波动图象,直观地模拟光拍的传播,研究光拍与两相拍光波的传播速度;最后进行了讨论．     

基于JPEG-LS预测的无损信息隐藏算法研究

对Thodi预测算法进行了改进,并且通过仿真实验,有选择地确定了预测误差阈值和阈值参数值.经初步测试,证明了在较大嵌入量的前提下,较好地提高了信噪比,并能够无损地提取隐藏信息.     

Generation of a novel spherical chaotic attractor from a new three-dimensional system

A new three-dimensional （3D） system is constructed and a novel spherical chaotic attractor is generated from the system. Basic dynamical behaviors of the chaotic system are investigated respectively. Novel spherical chaotic attractors can be generated from the system within a wide range of parameter values. The shapes of spherical chaotic attractors can be impacted by the variation of parameters. Finally, a simpler 3D system and a more complex 3D system with the same capability of generating spherical chaotic attractors are put forward respectively.     

曲线系方程的应用

曲线系方程有着广泛的应用,本文举例说明曲线系方程的各种应用。     

表面粗糙度选用浅析

表面粗糙度的选用是设计人员经常遇到的问题，本文主要介绍了表面粗糙度评定参数和参数值的选用方法。     

新安江模型参数的自动率定

为了解决顶报模型参数的自动率定,本文对新安江模型作了研究,探讨该模型参数优选中遇到的优化结果不一致性和不合理性问题,提出了一种适合于新安江模型参数自动率定的最优化过程,并应用于两个流域的模型参数率定中,效果较好。     

EXISTENCE OF MINIMIZING SOLUTIONS AROUND ＂EXTENDED STATES＂ FOR A NONLINEARLY ELASTIC CLAMPED PLANE MEMBRANE

The formal asymptotic analysis of D. Fox, A. Raoult & J.C. Simo has justified the two-dimensional nonlinear “membrane“ equations for a plate made of a Saint Venant-Kirchhoffmaterial,     

Optimal Delaunay Triangulations

The Delaunay triangulation, in both classic and more generalized sense, is studied in this paper for minimizing the linear interpolation error (measure in L^P-norm) for a given function. The classic Delaunay triangulation can then be characterized as an optimal triangulation that minimizes the interpolation error for the isotropic function ‖x‖^2 among all the triangulations with a given set of vertices. For a more general function, a functiondependent Delaunay triangulation is then defined to be an optimal triangulation that minimizes the interpolation error for this function and its construction can be obtained by a simple lifting and projection procedure. The optimal Delaunay triangulation is the one that minimizes the interpolation error among all triangulations with the same number of vertices, i.e. the distribution of vertices are optimized in order to minimize the interpolation error. Such a function-depend entoptimal Delaunay triangulation is proved to exist for any given convex continuous function.On an optimal Delaunay triangulation associated with f, it is proved that △↓f at the interior vertices can be exactly recovered by the function values on its neighboring vertices.Since the optimal Delaunay triangulation is difficult to obtain in practice, the concept of nearly optimal triangulation is introduced and two sufficient conditions are presented for a triangulation to be nearly optimal.     

具有语音播报功能的温湿度测量仪设计

1设计背景本设计是基于具有语音处理功能的凌阳单片机开发的温湿度测量仪表,此仪表可以将人们对湿度感觉不够灵敏的参数,通过语音进行播报.同时对超过人为设定的参数值进行语音报警,方便了人们在实际生产与生活中的使用.2系统总体结构系统主要分为温度测量、湿度测量、语音播报     

Research on an algorithm for solving parameter ranges in parametric drawing systems

To solve the problem that in parametric drawing systems,unreasonable parameter values in a parametric model often result in an improper shape of a geometric object,this paper proposes a novel algebraic algorithm for determining the valid range of parameter values in certain 2-dimensional parametric drawing systems.This algorithm can solve valid range of parameters such as radius and coordinate of centre points of parametric models with only linear segments and circles.The result of the study shows that all values within the valid range provided by this algorithm can ensure that the topological shape of a geometric object does not change after reconstruction,and to some extent,this algorithm can significantly promote the efficiency of parametric drawing system design and the intellectual level of human-computer interaction.The analysis shows that complexity of this algorithm is O( n2).