原理

In this paper, the mathematic model of a. c. excited generator system based on field-oriented control is established first. The simulated results operating at no-load and steady state are agreed with the test waveforms by means of 2. 8kW ACEG prototype developed by Harbin institute of large electrical machinery and Zhejiang University.

本文建立了磁场定向控制交流励磁发电机系统的数学模型，并采用哈尔滨大电机研究所和浙江大学联合研制的2.8kW ACEG系统实验原理样机，测试。。。

Their principle and construction for a portable low constant temperature trough are introduced and their testing data are given in this paper.

介绍了一种便携式低温恒温槽的工作原理及组成结构，并给出了试验数据。

Considering the problems of spurgear precise plastic forming, such as high deformation resistance, poor flowability and especial hardness to fill cant of gear, technological plan was developed based on precise plastic forming technique, successive control principle and consecutive local deformation theory. Moreover, structures of the rolling preform die and the die with up and down wellrounded forcer for stamping-extrusion and bulge-extrusion combining forming were designed too.

因此本文的主要研究内容和结果如下：本文以某种直齿轮：模数m＝2，齿数z＝20，压力角α＝200，变位系数x＝0为对象，针对直齿轮精密塑性成形变形抗力大，流动性差，特别是成形中齿轮角隅部分更加难以充满问题，基于精密塑性成形技术、逐次控制原理以及连续局部变形原理提出了&直齿轮滚轧制坯－镦挤、胀挤复合精成形&的工艺方案，设计了滚轧制坯的模具结构和上下冲头带圆角的镦挤、胀挤复合精成形的模具结构。

This paper firstly introduces the current state of ASSR system in our country and abroad, and then explains how the ear works and the mechanism of ASSR, including the stimulus, waveform parameter, theory, origins and effections.

本文首先阐述了基于DSP的嵌入式ASSR检测仪的意义及其国内外研究现状，然后介绍了人耳听觉原理和ASSR检测仪的检测机制，包括ASSR的刺激信号、波形参数、检测原理、产生部位和影响因素。

An automatic tracking system of target based on image is built.

建立了一套基于图像的目标自动跟踪系统，介绍了系统组成、设计原理以及算法原理。

The minimum travel-time tree algorithm is one of the main methods to trace rays, which is based on Huygens' and Fermat's principles and can be applied to complex geological model.

最小旅行时树法是目前主要射线追踪方法之一，该方法以惠更斯原理和费马原理为基础，具有适应复杂地质模型的优点，缺点是速度较慢。

Then the circumfluence R.M.S. compensation method is certified as the circumfluence suppressing scheme after the analysis of the current-averaging and circumfluence suppressing theory.Results of the algorithm validation for this parallel control scheme are also included.

此后建立了逆变器并联系统的数学模型，在对该系统分析负载电流均分原理和环流抑制原理的基础上，确立将环流有效值补偿波形调制比作为环流抑制策略，对该并联控制策略给出了算法验证结果。

First, we deduce a formula for vacuum polarization pressure as f ＝ G m M （ r ∕ r ＋ v ∕ c ）∕ r 2 , based on the isotropy of distribution of neutrinos ν0 in the lowest energy state in the physical vacuum, requested by the Pauli exclusion principle. Then, we deduced the metric equation of the general relativity and the equivalence principle according to this formula. Further, we demonstrate that this vacuum polarization pressure is the gravitation in general meaning.

首先从泡利不相容原理要求的在物理真空中最低能态中微子ν0分布的均匀各向同性出发，推导出真空极化压力公式 f ＝ G m M （ r ∕ r ＋ v ∕ c ）∕ r 2 ，然后由此公式推导出广义相对论的度规方程和等效原理，并论证此弱作用力的真空极化压力就是通常意义下的引力。

Heisenberg's uncertainty principle, one of the central tenets of quantum mechanics, maintains that you cannot pin down all the physical properties of a particle at the same time.

量子力学的一个重要原理——海森堡的不定性原理主张人们不能在同一时间定下粒子的物理属性。

Week 9 Huygens principle, supposition principle of wave, wave interference, application examples.

第9周 惠更斯原理；波的叠加原理；波的干涉；应用举例。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。