查询词典 approximation methods in physics

It can adjust time interval in light of approximation effect, and the current segment's approximation error is not influenced by other segments'. This method can improve approximation precision of reach set and makes the verification applicable in practical systems.

该方法可根据近似误差自动调节近似时所用的时间间隔，每段的近似误差不受其它段的影响，达到提高近似精度和减少计算量的目的，从而进一步降低验证方法实现的难度。

In the final chapter, we discuss interval polynomial approximation of rational surfaces. Firstly, we briefly state the interval-surface approximation based on the Taylor Expansion, and later, we give out a better interval-surface approximation based on the optimization method, which is also the main work of this paper.

第四章主要介绍了有理曲面的区间多项式的逼近，首先简单介绍了基于泰勒展开来做的区间曲面逼近，后面是本文的主要工作，我们基于优化方法得到了更好的区间曲面逼近，它也是本文的重要部分。

Padé approximation is an effective rational approximation.Using the first derivative of Gaussian function as basic wavelet,Pad conversion is used to obtain its rational fraction approximation.

采用高斯函数一阶导数作为基本小波，用Padé变换获得其有理分式逼近，利用开关电流技术实现小波滤波器可获得小波变换所需的基本小波及其膨胀小波。

Structure-Based Approximation Learning Theory: Under the description of manifold and topological architecture of neural field, we have proposed a learning frameworks of neural networks based on global architecture approximation theory borrowed from the concept of topology and manifold to solve the optimal problems of learning in non-nonlinear and non-Euclidean space, and discussed a few basic components of the learning theory, learning mechanism and learning algorithm in the term of structure-based approximation and global structure analysis.

基于结构的逼近学习理论：通过人工神经网络模型神经场的流形结构和拓扑结构描述，我们提出了在非线性和非欧氏空间中基于整体结构逼近的神经场学习理论框架；用对偶流形理论和拓扑概念作为工具，讨论了神经网络的学习理论、学习机理、学习算法和算法的具体实现。

Direct and inverse theorems of approximation by this kind of operators are discussed, and the Jackson—type integral estimation of approximation and Steckin — Marchaud inequality of weak type of uniform approximation for these operators are obtained.

讨论了一元Bernstein型算子的逼近正逆定理，建立了该算子逼近的Jackson型积分估计式和一致逼近的弱Steckin-Marchaud型不等式。

A wide range of methods of educational evaluation is used to improve the students potential, their individuality and their creativity.Based on large amount of practicing work, comparing research has been done on the international trend of physics curriculum reformation nowadays and the direction of physics curriculum reformation in China. Then in order to perfect the consultive version of high school physics curriculum standard in Shanghai, suggestions have been given on curriculum target, curriculum setting, curriculum content and curriculum evaluation.

本文在实践工作的基础之上，通过比较研究当今世界各国物理课程标准改革的总体趋势和我国物理课程标准的发展方向，针对《上海市中学物理课程标准》的修订，对中学物理课程定位、课程理念、课程目标、课程设置、课程内容和课程评价进行梳理并提出修改意见。

The cognitive confict.﹡The change of preconcept. While summarizing the concept research abroard, the dissertation studies the teaching of Physics concepts in China and understands how the teachers instuct the Physics concepts in the classroom.﹡Basically indentifying the importance in teaching Physics concepts.﹡Knowing the existence of pre-concepts in the students'mind to some dgree.﹡Lacking the teaching methods to change pre-concepts in the students'mind.

笔者在总结国外概念研究的同时，也在关注国内的物理概念转变教学，并用问卷调查了07年江苏省物理新课程培训的一线物理教师，总结了一线教师对于物理概念转变教学的认识：﹡对于物理概念的教学重要性有一定的认识；﹡对于学生所具有的前概念有一定的了解；﹡对于学生前概念的转变缺乏科学的认识。

With the development of new curriculum reform, in order to have a better implement on inquiry teaching in general middle school physics class, we investigated on practice implement status in quo in Chongqing No 48 junior middle school physics class by using case study ,comprehensive using different methods such as interview, questionnaire, class observation and literature analysis. By investigation we find some problems existed, discuss on basic idealities and discuss the implementary strategies in junior middle school physics teaching, then put forward some suggestions for its further development.

随着新课程改革的深入进行，为了在普通中学物理教学中更好地实施探究教学，本文采取个案研究方式，综合运用访谈、问卷调查、课堂观察及文献综述等多种方法，对重庆48中初中物理课堂探究教学实施现状进行研究，发现了其中存在的问题，探讨了初中物理教学的基本理念与实施策略，并为其进一步发展提出了建议。

Since Bloch's Theorem applies only to periodic potentials, and since unceasing random movements of atoms in a crystal disrupt periodicity, Bloch's Theorem is only an approximation, but it has proven to be a tremendously valuable approximation, without which most solid-state physics analysis would be intractable.

由于布洛赫定理仅对周期性势场的情况严格成立，而由于实际的晶体中不可避免的有各种缺陷或者原子相对于平衡位置的位移，所以布洛赫定理对于实际晶体来说只是一个近似。但是布洛赫定理对于固体物理的研究不可或缺。

The design of low pass FIR filter applying in electric system by using both window function and chebyshev approximation methods in MATLAB software were introduced,and the conclusion was gotten that the filter design based chebyshev approximation methods was best.

1概述在数字滤波器家族中，FIR滤波器与IIR滤波器相比，由于具有严格的线性相位和因果稳定性等一系列优点，因而得到了广泛应用。

When this condition occurs, inbound replication with the source partner is stopped on the destination domain controller and event ID 2042 is logged in the Directory Services event log.

计算机密码学是研究计算机信息加密、解密及其变换的科学，是数学和计算机的交义学科，也是一门新兴的学科。

Instructions: click on the thumbnails to see a larger image, then use the left-right arrow keys to scroll through the slideshow.

使用说明：滑鼠点在小图上即可放大观赏。开启后键盘左右键可用来换照片。