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The self-excitation criterion of single-machine is difficult to apply to multi-machine power system, so the mathematical model to judge the self-excitation of all generating sets in multi-machine power system is researched.

1引言随着同步发电机组单机容量的增大和远距离负荷中心电站的建设，以及电力系统容量、电压和输电距离的不断发展和提高，许多问题随之产生，同步发电机的自励磁问题就是其中之一。

In order to study characteristics of the early signal with TEM, the authors formulated self-induction formulae for single coil and multi-turn coils, deduced theoretical expressions for the amplitude of the loop self-induction signal, and gave the induction of single coil and multi-axial coils. The response curve of buried object affected by the coils nod the length of loop's change are also studied.

为研究瞬变电磁早期信号的特性，讨论了多匝线圈与单匝线圈的自感系数的关系，得出线圈自感信号振幅的理论表达式，推导了单匝和多匝回线的电感公式，分析了回线匝数和回线边长的变化对目标体响应曲线的影响。

In this paper, the system model for multi-user asynchronous DS/CDMA under multi-path fading channel is presented firstly. Then the Maximum Likelihood Sequential Estimation algorithm under time-invariant channel is described in a new form which is different from Verdus work.

本文首先给出了多径异步多用户DS/CDMA系统的一种数学模型，得出了恒参信道下最大似然检测算法的一种新的表示形式。

Whole series of high-volt winding adoptsg multi—Iayer structure:among the products 500kVA or lower,the low-volt winding is multi—layer type.

全系列高压绕组采用层式结构：500kVA及以下产品中，低压绕组为层式

The residual stress in the thickness after one LP and multi-LP and the distribution of residual stress after single pill and multi-pills shot the sheet metal are analyzed.

数值模拟分析了激光单点喷丸板料后，材料厚度方向的残余应力分布，以及激光多点。多排喷丸板料后材料厚度方向的残余应力分布。

The results show that the reaction is of multi-channel and multi-step. It may proceed on singlet and triplet potential energy surface.

研究结果表明：CH3与NO是一多通道多步骤的复杂反应，可以分别在单重态和三重态势能面上进行。

Keywords: bservational analysis;metric geometry;sobolev space;multi-scale;multi-grid

中文关键词：观测分析；度量几何；索伯列夫空间；多重尺度；多重网格

This thesis also analyzed and summarized the characteristics of the goal system of school physical education in three stages.This thesis also analyzed and summarized the characteristics of the goal system of school physical education in our country. The emphasized part of the school physical education goals altered instantly. The goals of school physical education have been affected by non-educational factors such as competitive sports, subject-center theory, multi-way and multi-layer of school physical education development as well as educational reformation and educational ideas.In this thesis, the existing problems in goal system of school physical education of our country that was pointed out that: The shortage, solecism and the confused expression of theoretical school physical education researches.

我国学校体育目标体系的发展过程分"文革"前、"文革"时期和改革开放以来三个阶段，每个阶段学校体育目标体系各有特点：建国初期，学生的健康问题受到高度重视，增强体质被当作政治任务来要求；"文革"中，学校体育目标被极端政治化；改革开放以来，"增强学生体质"被当作学校体育的首要任务和评价标准，学校体育目标体系逐渐有了层次性区分，内容空洞的现象有所改善，学校体育目标体系的视角拓宽，学生个人需要受到重视，逐渐突出健康目标，重视测试与评估，与此同时，学校体育也受到了竞技体育发展的强烈影响。

In order to overcome the disadvantage of volume effect and improve prospecting precision of MT, the paper puts forward a multi-channel telemetry method of stratum resistivity for linearity processing exploring depth and electromagnetic frequency in the local area, which creates a crresponding relationship between stratum resistivity and sounding line, and a multi-channel observation system is designed accordingly to explore the resistivity of underground ledge.

为克服大地电磁勘探中"体积效应"的缺点，提高探测精度，提出多道遥测地层电阻率法，该方法是在一个局部区域内，将勘探深度和电磁波周期进行线性化处理，使得地层电阻率和测深曲线建立对应关系，并据此设计了一个多道探测地下矿层电阻率的观测系统。

In other words, on the basis of known low space resolution multi-spectral image and high space resolution panchromatic spectral image, it will simulate to create high space resolution multi-spectral image.

针对这一应用目的，本文在对现有的定性定量指标分析的基础上，设计了一组适合本文的评价标准，就是在目视判读的基础上，采用平均梯度和小波能量分析融合影像和原始未降解的多光谱影像的空间分辨率差异，采用标准方差、标准偏差和协方差矩阵行列式值分析融合影像和原始未降解的多光谱影像的信息差别，采用均值、中值和归一化最小方差分析融合影像的光谱信息保持程度。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。