查询词典 approximation methods in physics

In this dissertation, the best simultaneous approximation with weight to infinite sequence from simultaneous-suns in complex normed linear space is considered, and in the case when the weight satisfies a certain condition, the characterizations of approximation from a simultaneous-sun and uniqueness of approximation from a RS-set are obtained; moreover, in the case when the weight is free, the characterizations of approximation to a totally bounded sequence from a convex set are established.

本文在复赋范空间中研究了同时太阳集对无限序列的加权同时逼近问题，在权满足一定条件时，通过把所研究问题转化为连续向量值函数空间中相应集对一个上半连续函数的最佳逼近问题，得到了逼近的特征和RS集逼近的唯一性定理，有例表明它们是已有结果的本质推广；在权不受限制时，得到了凸集对全有界序列逼近的特征。

First low order approximation of generating function and approximate optimal trajectory were obtained. Then using low order approximation of generating function of Hamilton "relative motion" to the approximate optimal trajectory, improvement of the approximate optimal trajectory was iteratively made. In this way, high order approximation accuracy can be obtained by only using low order approximation, which is much cost effective in computing.

首先以较低的计算代价，获得最优控制Hamilton系统生成函数的低阶近似，得到一条近似的最优轨线，然后将最优控制Hamilton系统相对于近似最优轨线求"相对运动"，该"相对运动"仍具有Hamilton性质，利用这一"相对运动"的生成函数低阶近似，可以对近似最优轨线进行迭代修正，从而以计算代价较小的低阶近似逼近计算代价高得多的高阶近似的精度。

The main work of the thesis consists of summarizing the characteristics of the approximation methods,compiling the programs of approximation methods,and getting availability of every approximation method according to examples.

本文的主要工作是总结各种近似方法的特点，编写各近似方法的程序，通过算例总结出各种近似方法的适用性。

It includes radiological imaging physics, radiation oncology physics, nuclear medicine physics, the use of non－ionizing techniques such as nuclear magnetic resonance, ultra－sound, microwaves, radio frequency waves, and lasers, as well as health physics.

医学物理包括放射肿瘤物理(radiation oncology physics， ROP)、医学影像物理(medical imaging physics， MIP)、核医学物理(nuclear medicine physics， NMP)，其他非电离辐射如核磁、超声、微波、射频、激光等物理因子在医学中的应用，和保健物理(health physics， HP)等分支内容。

Base the embodiment of modern physics and correlative technology, intersectional subjects in high school physics curriculum among the every science curriculum reform home and abroad, especially, the instances that typical high school physics textbook bring modern physics in it, analyse the correlative instances studied before.

从国内外的历次科学课程改革，对现代物理学以及与其相关的技术、交叉学科在高中物理课程中的体现，尤其是从国内外典型的高中物理教科书对现代物理学内容的纳入情况出发，分析已有研究的相关情况。

Phys. The science of matter and energy and of interactions between the two, grouped in traditional fields such as acoustics, optics, mechanics, thermodynamics, and electromagnetism, as well as in modern extensions including atomic and nuclear physics, cryogenics, solid-state physics, particle physics, and plasma physics.

物理，物理学：有关物质和能量及两者之间相互作用的科学，传统上分为声学、光学、机械学、热力学和电磁学，现今又扩展到包括原子物理、核物理、低温学、固体物理学、微粒物理学和等离子体物理学

As the creed of the curriculum reformation, the reformation of physics curriculum standard has been mostly emphasized. In 2003, China educational committee came out with an experimental version of senior high school physics curriculum standard, and in the same year, Shanghai educational committee came out with a consultive version of high school physics curriculum standard in Shanghai. This reformation has widely drawn the attention in all circles, and I was great honored to take part in the edit of the consultive version of high school physics curriculum standard in Shanghai.

而作为改革的纲领，物理课程标准的改革更是被提上日程。2003年，我国教育委员会和上海市教育委员会相继出台了《高中物理课程标准》和《上海市中学物理课程标准》，此次改革应起了社会各界人士的关注，本人也有幸参加了《上海市中学物理课程标准》的修订工作。

HU Dong,YUAN Changying,LI Ping,CHENG Xinlu,LIU Jinchao,SUN Zhumei Laboratory of Shock Wave Physics and Detonation Physics Research,Institute of Fluid Physics,CAEP,Mianyang,621900, Institute of High Temperature and High Pressure Physics,Sichuan University

中国工程物理研究院流体物理研究所冲击波物理与爆轰物理国家级重点实验室，绵阳621900 [2]北京科技大学，北京100047 [3]四川大学高温高压物理研究所，成都610065

Since 1957 Lee's "weak interaction in the parity nonconservation" concept was experimental and that shared the Nobel Prize in Physics; its 1954 proposed standard field theory, in the 1970s developed into integration and understanding elementary particle strong and weak, and electromagnetic interactions of the three foundation are also in the statistical physics, condensed matter physics, quantum field theory, mathematical physics in a number of outstanding major contribution.

著名美籍华裔科学家、物理学大师、诺贝尔物理学奖获得者。1957年由于与李政道提出的&弱相互作用中宇称不守恒&观念被实验证明而共同获得诺贝尔物理学奖；其于1954年提出的规范场理论，则于70年代发展成为统合与了解基本粒子强、弱、电磁等三种相互作用力的基础；此外并曾在统计物理、凝聚态物理、量子场论、数学物理等领域作出多项卓越的重大贡献。

A set of quadruply coupled equations (fluid flow, convection-diffusion, energy conservation and mechanical equilibrium) with a number of cross-couplings and coupled constitutive relations is formulated to quantify the multi-physics of oil displacement by CO2 injection, implemented into and solved by using FEMLAB. FEMLAB is the first engineering tool that performs equation-based multi-physics modeling in an interactive environment. With FEMLAB, the coupled multi-physics model can be solved simultaneously. The applicability of this model has been demonstrated through an example of simulations for a two-dimensional reservoir of size 1000 m×1000 m with one injection and one production wells. Model results illustrate the significant importance of the cross-couplings between individual (thermal, hydrological, chemical and mechanical) physics.

首先，建立一套流、固、热、多相流等多场全耦合控制方程组及其相应的耦合本构关系；然后，采用FEMLAB为工具来模拟三次采油阶段CO2驱油过程中的流、固、热、物质守恒等多场之间的全耦合作用，是第一个人机交互式的基于偏微分方程组的多物理场耦合分析的工程工具，利用FEMLAB，该4个耦合方程组成的方程组可以一次同时被求解出来：最后，应用该模型来求解一个二维油田的驱油情况，数值计算结果表明，原位应力、注入温度、注入压力等因素对CO2的地下贮存效率、驱油速度等有重要影响。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。