分解原理

We introduced two newly developed methods, one is the Maximum Entropy Principle for the analysis of the positron lifetime spectra, and another is the two-detector Doppler broadening technique with so-called W-S map for identification elemental specificity of positron annihilation spectra.

介绍了最新发展的正电子谱学方法，用于分解正电子寿命连续分布的最大熵原理，用于鉴别缺陷化学环境的双探头多普勒展宽和W-S图。

And this article divides the farmers into three grades in the point of qualitative and quantitative views, and according the principle of econometrician, using the way of Oaxaca analysis, choosing and analyzing the controllable variables in the maize process, in order to find the main ingredients which forming the difference about the behaviors of maize producers based on the different maize grossing zones.

本文通过对南北三省农户玉米生产的投入和产出情况进行实地调查，首先比较分析了不同收入等级农户、不同地区农户和不同土地等级玉米生产的成本和收益情况；然后从定性和定量的角度将农户分为三个等级，再从农户等级和不同玉米种植区的角度出发，根据计量经济原理，运用OAXACA分解分析方法，选择农户玉米生产中的可控制变量对其进行分析，以找出形成农户玉米生产行为差异的主要影响因素。

Some new viewpoints are also discussed besides the development of researches already explored. The above mentioned aspects include exploring ne w elementary technique, possible scheme for simplifying the structure, achieveme nt of dynamic area decomposing method, establishment of distributed parallel pro cessing system and application of similarity method in numerical simulation of w elding process.

除对本研究组已开展的工作进行了一定的分析外，并对某些未来的研究发展方向进行了初步的探讨，这些可能进行的研究包括单元技术的开发、可行的结构简化方案、动态区域分解算法的实现、分布式并行处理系统的建立和相似原理在焊接过程中的应用等。

In this chapter the author expounded the origin of the concept of Free-form generators, pointed out that it is the certain result of the development of synchronous multi-axis CNC technology, explained the basic principle of the machining of extended epicycloid bevel gears on Free-form generators and the methods for both hardware and software implementation.

论文第2章是全文的基础，在这一章中，作者论述了Free-form型机床概念的由来，指出它是多轴联动数控技术发展的必然结果；阐述了Free-form型机床加工延伸外摆线锥齿轮的基本原理及其软硬件实现方式；将机床控制系统分解为包含两根虚拟主轴的有两组独立联动的八轴八联动系统；建立了Free－form型机床的数学模型；推导了展成运动速度、加速度及高阶加速度的表达式，为后续的理论分析奠定了基础。

By analyzing the faultiness of the wavelet method used in processing signal denoise and detection of weak signal.

通过分析小波变换处理信号噪声的方法及其在微弱信号检测方面的不够完善之处，提出适合于极低信噪比条件下小波消噪法的信号检测原理和方法，即通过构造具有可调功能的阈值函数以及对小波分解系数处理方式的优化设计等方法，在强背景噪声中提取出微弱的信号特征信息，从而实现微弱信号的检测。

The fundamental of non-negative matrix factorization algorithm. It is used to extract EEG power spectrum feature. Artificial neural network is employed as classifier.

介绍了非负矩阵分解算法的基本原理，给出一种利用NMF 进行脑电能量谱特征提取的方法。

However, because of the positive sequence of fundamental frequency, there are still some shortages for wavelet transform in the use of harmonic measurement of three-phase dissymmetrical system. A new approach of harmonic measurement based on Period-interleaving of MALLAT arithmetic for dissymmetrical system is put forward. Analysis and experiment based on TMS320LF2407 Digital Signal Processor are made. And the result of experiment reveals that the proposed method based on Period-interleaving is valid in the use of harmonic measurement of three-phase dissymmetrical system.

但是，目前小波变换在三相不对称系统的谐波检测中存在着无法分离基波正序信号的不足，本文就此提出了一种用于三相不对称系统的基于周期交错的小波MALLAT多分辨率分解的测量方法，详细介绍了该算法的原理、流程及计算公式，同时以TMS320LF2407数字信号处理器为核心建立了实验系统对该算法进行了实验，实验结果证明该周期交错－小波变换算法可以有效地检测出三相不对称系统中的有害电流。

The project proposed and established the strict unique mathematical model of instantaneous frequency aiming at the currently existed problems in Hilbert Huang Transform form the viewpoint of physical connotative meaning; proposed and established the strict mathematical model of general intrinsic mode signal based on the concept of general continuous intrinsic mode signal and the compositive principle of practical general intrinsic mode signal; researched and proposed the fitting method of envelope lines in HHT from the viewpoint of theory, conquered the blindness and random in quondam EMD envelope line fitting and boundary treatment; developed a virtual time-frequency analyzer based on general intrinsic mode signal decomposition to open out the local time-frequency characteristics of nonlinear and nonstationary signal more deeply and accurately.

本项目针对希尔伯特-黄变换现阶段存在问题，从物理内涵的角度提出并建立了瞬时频率严格的唯一的数学模型；基于连续性的一般固有模态信号的概念和实际信号的一般固有模态信号的组成原理，提出并建立了一般固有模态信号严格的数学模型；从理论角度研究并提出HHT中的包络线构造方法，克服了原EMD的包络线构造和边界处理的盲目性和随意性；研发一台基于一般固有模态信号分解的虚拟式时频分析仪，使之可以更深入、准确地揭示非线性非平稳信号的时频局部特征。

The main research contents are stated asfollow: 1. Simplified analysis method of space grids structuresDouble-layer space grids have been assumed as sandwich plate, and are analyzed bythe nontraditional theory of plate with consideration of shear deformation and threegeneralized displacements. Using the theory of energy variation, simplified methodsfor bending, stability and vibration analysis of double-layer space grids have been putforward based upon the idea of split rigidity. The formulas for calculating internalforces, displacements, critical load and natural frequency have been given out. Set thestable cables and bearing cables in hyperbolic paraboloid cable nets are all replaced bytruss-cable to form truss-cable nets structures. Natural vibration analysis method fortruss-cable nets structures has been put forward using the energy variation method andRayleigh method.

主要内容包括： 1、空间网格结构静动力简化分析方法把网架结构简化为夹层板，采用考虑剪切变形的具有三个广义位移的平板弯曲理论进行分析，基于分解刚度思想利用能量变分原理提出了网架结构弯曲、稳定与振动分析的简化计算方法，给出了位移、内力、屈曲临界荷载和固有频率的计算公式；将双曲抛物面索网中的稳定索与承重索均用劲性索代替形成劲性索网结构，基于能量变分法和Rayleigh法给出了劲性索网结构固有振动分析的简化计算公式。

In the base of above research, establish movement model of hyperboloid clutch with rollers and find the relation between force of outer race and moment of inner race. I establish mechanics model of hyperboloid clutch with rollers with differential geometry.

在上述研究的基础上利用运动转化原理建立了内外环与滚柱之间的运动模型，并利用微分几何的相关知识通过对施加在外环上的主动轴向力的分解及合成，求的其在内环上所产生的力学反应，建立双曲面滚柱加载器力学模型。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。