近似方法

On basis of analyzing the present research situation and existing question of Web knowledge acquisition, this dissertation mainly studies the essential technologies of concept semantic generation, the common text classification methods, user profile construction and approximate query technique based on concept. The main research works are shown as follows.

本文在分析网络知识获取相关技术的研究现状和存在问题的基础上，研究了概念语义生成技术、文本分类方法、典型用户会话模板生成方法以及基于概念的近似查询技术，主要取得以下研究成果：(1)借助NMF算法的分解结果具有实现上的简便性以及分解形式和分解结果可解释性的优点，提出一种基于NMF的概念语义生成方法。

And that method is different from the adding base point method and impact method from importing derivatives of higher order.

他与增加基点数目的方法和引入高阶导数的紧致方法不同，是微分方程差分近似高精度化的一种新方法。

Bsed on real circumstances of TV transmitting station,the artiele presents a methodof calculation of field strength in case the radiowave is affected by ground objectsand meteorological conditions,and that of approximate calculation of field strengthIn penumbra areas,and so on,A method of calculating field strength in city is alsopresented with int...

文章从电视发射台的实际情况出发，介绍了电波受地物、气象等影响时的场强计算方法和半阴影区的近似场强计算方法等。还介绍了在城市的电波计算中，引入"建筑物密集度"参数的场强计算方法。

The book is divided into 14 chapters, including Introduction, continuous control system theory, process and discrete sampling, Z transform, sampled-data systems, discrete approximation of continuous system the equivalent, based on mathematical transform the classical design method, based on state space pole placement design methodology, multi-variable system of quadratic optimal control, quantitative effects, the choice of sampling period, the digital control system modeling, digital control system for a variety of design methods, variables quadratic optimal control systems, sampling cycle of selection, non-linear control of the problem, as well as digital control system, a typical application - Disk drive servo control design.

全书共分14章，内容包括概论、连续控制系统理论、采样过程和离散化、Z变换、采样数据系统、连续系统的近似离散等效、基于数学变换的经典设计方法、基于状态空间的极点配置设计方法、多变量系统的二次型最优控制、量化效应、采样周期的选择、数字控制系统的建模问题、数字控制系统的各种设计方法、变量系统的二次型最优控制、采样周期的选择、非线性控制的有关问题，以及数字控制系统的一个典型应用——磁盘驱动器的伺服控制设计等。

Based on description method of damping motion in mechanical vibration, variables movement of generator are divided into two basic motion models: damping oscillation and critical damping motion. Detail methods of extracting damping parameters from simulation data is introduced to establish variable motion models. An approximate method is put forward to simulate low-frequency signal and generator response characteristic, from which motion models and damping parameters of main variables are obtained. The influences of oscillation amplitude, frequency and initial operating point of power system to the motion damping parameters are analyzed.

借鉴机械振动中阻尼运动的描述方法，将低频振荡下发电机主要变量的运动归纳为阻尼振荡和临界阻尼两种基本运动形态；介绍了从仿真数据提取阻尼参数建立参数运动模型的方法，实现对发电机振荡特性的量化分析；提出一种系统侧低频振荡信号的近似模拟方法，并应用于发电机响应仿真，获得了主要变量的运动模型和阻尼参数；分析了系统侧振荡幅度、频率以及初始工况对发电机功角振荡的影响。

This paper presents the geostrophic and gradient wind appropriate calculation formulas used on facsimile surface weather chart, puts forward a new method of sea surface wind estimating from the theoretical wind speed by establishment of the wind speed correction database. Also the application characteristics and advantages of the gradient wind calculation method on severe weather system are discussed.

为了深入探讨海面风估算方法，给出了传真地面天气图上地转风、梯度风的近似计算公式，介绍了用传真图实时计算地转风与梯度风的实现方法，提出了通过建立风速订正值库由风速理论值实时估测平均海面风速的一种新方法，并深入探讨了梯度风测风方法在强天气测风中的应用特点和优势。

Concerning model experiment, the authors introduces the methods for the seeking of similarity criterion, the approximative modelling and the verification of model experiment, and practical similarity method is presented for the research of model experiment.

针对模型实验，较详细地介绍了寻求相似准则的方法、近似模化的具体方法和模型实验的验证方法，为今后从事模型实验研究工作提供了实用的相似方法。

Z2Bn z$e0A0 Meshless method is a new numerical computation method that is developed rapidly in recent years. Without element mesh and based on the dispersed nodes to form approximate interpolative function dynamically, meshless method has distinct difference with traditional finite element method. Meshless method conquers the problems caused by mesh generation, mesh aberration and mesh move. With provides a new effective means to engineering problem, meshless method obtain highly recognition in international compute mechanics domain and engineering field.

6L！y6K1Q6h0k0 无网格方法是近年来迅速发展起来的一类新型数值计算方法，它们不借助单元网格而是基于离散结点动态构造近似插值函数，与传统的有限元方法有着显著的区别，克服了网格生成、网格畸变和网格移动引起的问题并为工程问题提供了一种新的有效分析方法，受到了国际计算力学界和工程界的高度重视。

objective to introduce a method for repair of defects of alae nasi.methods transplantation of whole or partial free auricle composite tissue was designed in reconstruction of alae nasi.partial auricle composite tissue transplantation was used in 14 patients,the area of the graft was 1.0cm×1.5cm～1.9cm×2.5cm.whole auricle composite tissue transplantation was used in 6 patients,the area of the graft was 0.5cm×0.5cm～0.8cm×1.2cm.results all grafts survived.the grafts were dark red or light red in color,there were no blisters on them.follow-up of more than six months showed good results.conclusion in many methods for repair of defects of alae nasi,this method is simple,the appearance of alae nasi is good after operation and there is no new scar on face.

目的 修复鼻翼缺损。方法采用全层或部分耳廓复合组织游离移植的方法修复鼻翼缺损20例，其中以鼻翼残存瘢痕组织翻转作衬里，然后进行部分耳廓复合组织游离移植14例，移植物面积最小1.0cm×1.5cm，最大1.9cm×2.5cm；利用耳廓复合组织全层嵌入游离移植修复鼻翼缺损者6例，移植物面积最小0.5cm×0.5cm，最大0.8cm×1.2cm。结果 20例移植组织全部成活。色泽呈暗红至淡红不等，无水泡。随访半年移植物色泽与鼻组织基本近似，供区隐蔽。结论在诸多鼻翼缺损修复方法中，该方法简便易行、术后鼻翼外形好，面部显著部位不增加新的瘢痕，有独到优越性。

In a word, a new method that theoretically calculates the relativistic corrections and the fine structure of the energy levels in two-electron atom, including the atomic Hamiltonian expressed by spherical tensors, the calculation of the angular matrix elements and the summations over spin of the various interactions in the atomic Hamiltonian, and the approximate calculation of the radial matrix elements, has been provided in this thesis.

总之，本文为双电子原子能级的相对论修正和精细结构的理论计算提供了一种新的方法，包括原子哈密顿算符的球张量表示方法、原子哈密顿中各种相互作用项的角向矩阵元和自旋求和的计算方法，以及径向矩阵元的近似计算方法。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。