查询词典 constructive existence proof

The first disadvantage of MMI device is wavelength sensitive, which leads to restricted applications. To reduce the wavelength insensitivity in optical network applications, the demand of light source with a specific wavelength is needed, especially for power splitters. For this reason, a wideband criterion for MMI splitter is proposed. The basic principle is based on reducing the interference length difference and making it shorter than the spot size for constructive mode interference. Simulation results show the spectra of proposed MMI splitter is wide enough (1.26-1.61um) to cover the fiber communication band and the size of the splitter is more compact than that of the conventional MMI or Y-branch splitter.

多模干涉元件的第一个缺点为波长敏感，此缺点会限制其在实际上的用途；因元件在网路上的应用时，通常都需要降低波长敏感性，以减低对光源波长准确性的要求；有鉴於此，本论文提出多模干涉分光器的宽频标准；基本原理是建立在缩短其多模干涉区的长度差，并使之小於建设性干涉的光点大小；透过模拟后发现，操作频宽可涵盖光纤通信全波段(1.26-1.61um)，且长度小於Y形分支结构的分光器。

The extracted P-wave is reverse-time extrapolated and imaged with a P-velocity model using a finite difference solution of the scalar wave equation, the extracted S-wave is reverse-time extrapolated and imaged similarly, but with an S-velocity model, and converted S-wave data requires a polarity correction prior to migration to ensure constructive interference between data from adjacent source.

在模型中，每个网格点的纵、横波成像时间，为震源到该网格点的纵波初至时间。利用纵波速度模型和声波传播方程的有限差分解，对反射纵波进行逆时延拓和成像，利用横波速度模型和声波传播方程的有限差分解，对转换横波进行逆时延拓和成像，并在偏移前进行极性校正。

However,this"GROWTH Model"is not based on a static process,but a process that allows constructive mathematics to take its course.

然而，这种"增长模式"不是建立在一个静态的过程，而是一个过程，允许有建设性的数学，任其发展。

In this paper, we are discussing the concept of intuitionism, and their logic ,and their constructive mathematics.

本文主要讨论直觉主义派的数学观、无穷观、逻辑规则和构造性数学，同时还概述了人们对直觉主义派的一般评论。

Peter Borwein is Professor of Mathematics at Simon Fraser University and the Associate Director of the Centre for Experimental and Constructive Mathematics.

彼得Borwein在西蒙·弗雷泽大学和实验和有建设性数学的中心的副主管是数学的教授。

The role of the teacher in teaching process should be freshened. Teacher is no longer a simple teaching machine, but an inspirer, organizer, participatant and guide in the constructive activities of mathematics.

要重新认识教师在教学过程中的主导作用，教师不再是简单的知识传授者，而应是数学建构活动的激励者、组织者、参与者和导向者。

Teacher is no longer a simple teaching machine, but an inspirer, organizer, participatant and guide in the constructive activities of mathematics.

要重新认识教师在教学过程中的主导作用，教师不再是简单的知识传授者，而应是数学建构活动的激励者、组织者、参与者和导向者。

This thesis is based on understanding and analysis of educational theory of Freudenthal's thought of mathematics education. It does analytical and Practical research on mathematics teaching in kindergarten in an effort to provide the thought and approach for reference. The intention is to Promote the kids to study mathematics efficiently,to master it comprehensively and to use it properly. At the same time,it also offers some constructive suggestions to the present mathematics teaching reformation.

本文基于对弗赖登塔尔数学教育思想的认识和分析，对幼儿园数学教学开展分析和操作性研究，旨在为促进幼儿有效地学习数学、理解地掌握数学、恰当地运用数学的数学教学提供一个可借鉴的思路和途径，为当前数学教育改革提供一些建议性对策。

Math Publications, Techreports, Preprints on the Internet - Centre for Experimental and Constructive Mathematics CECM

加拿大数学实验与建设中心的数学出版物网站，包括数学的电子刊、档案、技术报告、出版信息、时事通讯和公告等。

Last, it is important to have a constructive philosophy of life.

最后，这是重要的是要有建设性的人生哲学。

"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。