查询词典 cross-section paper

A method of cross power spectral density between responses is derived and a poly reference modal analysis method using cross power spectral density method in frequency domain is presented in this paper.

对各测点响应的互功率谱密度函数进行了详细推导，提出了一种基于互功率谱密度的频域多参点辨识法，这意味着许多原本利用频响函数的传统频域识别法可以很容易地用于工作状态下的模态识别，大大开阔了未知激励下模态识别的视野。

The main job and contribution of this paper are as follows:Based on narrowband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, compute the cross-correlation function of FH signals from multichannels, then we get the cross power spectral density matrixCSDM Secondly, select the hops of FH signals from the CSDM via processing and analyzing the CSDM, meanwhile reduce the influence coming from noise, fixed frequency signal and other interferences; Lastly, estimating the DOA of every hop and according to the DOA, we can separate the hops, get the number of FH signals and their parameters. Propose a new method for designing the threshold in FH signal detection. This method makes it easy to get the threshold by theoretic computing and it can extremely reduce the interference of non-FH signals.Based on broadband signal processing, we propose a new method for FH signal blind detection and blind parameter estimation. Firstly, get the DOA of the signals by wideband spatial spectrum estimation; secondly, separate the signals by spatial filtering using wideband beamformer; Lastly, we propose two methods for FH signal blind detection and blind parameter estimation, one is for several constant hop-rate FH signals whose dwell-time are different and another is for a single FH signal whose hop-rate is alterable.By employing spatial interpolation in broadband signal beamforming, it can reduce the number of antenna elements and corresponding RF modules, A/D converters, etc. It can also eliminate the mutual coupling between antenna elements while getting the narrower main beamwidth and lower sidelobe level.

本文的主要研究工作和贡献如下：●提出了一种基于窄带处理的FH信号盲检测和参数盲估计的实现方法，即首先求出多路信号之间的互相关，进而得到互功率谱密度矩阵，然后通过对CSDM进行对折处理来抑制噪声、定频信号及其他干扰的影响，并将所有属于FH信号的hop(每一跳的驻留时间在时频图上持续的线段)从CSDM中筛选出来，最后用阵列信号处理中的到达方向估计理论在频域中估计出各个hop的方向参数，利用方位信息完成FH信号分离并得到FH信号的数目及其各自的参数集；●提出了一种确定FH信号检测门限的策略，该策略不仅使得检测门限能够通过理论计算得到，而且还显著地抑制了非跳频信号的干扰，从而能有效地检测出FH信号；●提出了一种基于宽带处理的短波FH信号盲检测和参数盲估计的实现方法，即首先利用宽带空间谱测向技术得到接收信号的DOA，然后采用宽带波束形成技术对特定方向进行空间滤波，实现多个信号的分离，最后分别提出了两种FH信号的盲检测和参数盲估计方法，第一种方法适用于空间某个特定方向上存在着几个驻留时间不同的恒跳速FH信号和其他干扰信号的混合信号，第二种方法适用于空间某个特定方向上仅含一个可变跳速的FH信号和噪声的混合信号；●将空间插值的概念和宽带波束形成技术结合起来，提出了一种基于频域处理的宽带恒定束宽的波束形成方法。

And those collision cross sections may be determined by fitting the simulation results from experiment data. At first, we calculate the effective ionization coefficients/N and drift velocity Ve of pure gas to determine collision cross sections in this paper, and the calculated results are agreement with the experiment data.

本文首先建立单一气体电子崩发展的蒙特卡罗模拟方法，用得出的电子崩参数与实验结果比较的方法，计算单一气体的/N和漂移速度Ve，并与实验数据比较，以确定碰撞截面的准确性。

The technology of cross-coupled filter is analyzed in this paper, the theory of cross-coupled matrix and its topology is also analyzed.

对滤波器交叉耦合技术进行了研究，分析了交叉耦合的矩阵理论，并大致分析了其拓扑结构。

In this paper the resistance of Fulvia fulva to flusilazole, inducing resistance of sensitive isolates, biological characteristics of mutant-isolate and cross-resistance to other fungicides were studied. The level and distribution of F.fulva resistance in Liaoning, the fitness of mutants, the relation of cross-resistance between flusilazole and other fungicides were confirmed.

本试验系统地研究了目前辽宁省主要保护地蔬菜种植区的番茄叶霉病菌对杀菌剂氟硅唑的抗药性现状、敏感菌株抗药性诱导、抗药性菌株生物学特性以及与其它药剂的交互抗药性关系。

This paper deduces the accurate formulas for calculating the geometric characteristics of effective cross sections of members with welded H-shaped cross sections in gabled frames,and in order to simplify the calculation,presents the corresponding approximate calculation formulas.

推导了门式刚架中焊接H形截面构件有效截面几何特性的精确计算公式，为简化计算过程，给出了相应的近似计算公式。

This paper makes a comparative analysis on the function of six cross-database search systems such as SearchLight, NLM Gateway, ISI CrossSearch, CALIS, CSDL and CNKI at home and abroad. In aspects of resources navigation, search function, search results display, content sensitive links, personalized service, special function, as well as other functions, the author puts forward some suggestions on the perfection of cross-database search system function.

选取国内外较有代表性的6个跨库检索系统：SearchLight、NLM Gateway、ISI CrossSearch、CALIS的统一检索平台、CSDL的集成检索系统、CNKI的跨库检索系统，从资源导航功能、检索功能、检索结果显示功能、内容敏感链接功能、个性化服务功能、特色功能、其他辅助功能7个方面对其进行比较分析，提出完善跨库检索系统功能的几点建议。

The main contribution of this paper is summarized as follow:1 Copolymer acrylate resin including hydroxyl, carboxylic and amina(-NH_2) is a new type of antifogging system and ahydrophi- lic antifogging constituents which is not found before.2 Water-soluble acrylate resin hydrophilic antifogging coating material is a new-type environmental protection material which takes ethanol as solvent and whose pastiness is adjusted by deionized water.3 The quality rate of accessory soft monomer ethyl acrylate and accessory hard monomer butyl methacrylate is 6 to 4, the quality rate of functional monomers in all monomers is 20 percent, the quality rate of MAA in the functional monomers is 22 percent, the quality rate of β-hydroxyl ethyl acrylate in the functional monomers is 8 to 10 percent and the remainder of functional monomer is acrylic acid.4 Cross-linking agent methylol acrylamide belongs to self-cross-linking system.

本文的主要贡献概述如下： 1 含有亲水羧基、羟基和氨基(-NH_2)丙烯酸共聚树脂是一种新型高效的防雾体系，用的亲水防雾组分是前所未有的。 2 以乙醇为溶剂制得水溶性丙烯酸树脂具有很好的水溶性能和防雾性能，只需加入去离子水就可以调节它的粘度，是一种新型的环保型防雾材料。 3 辅助软单体丙烯酸乙酯和辅助硬单体甲基丙烯酸甲酯最佳配比为质量比6∶4；官能单体占单体总量的20%，甲基丙烯酸占官能单体总量10～15%，甲基丙烯酸β-羟乙酯占官能单体总量的8～10%，剩下的为丙烯酸。

This paper describes the deformational characteristic of different kinds of cross-rolling process, sumerizes the law of development cross- rolling elongation and reveals the tendency of hot elongated accurate seamless tube .

本文阐述了不同无缝管斜轧延伸变形过程的特点，总结了斜轧延伸的发展规律，揭示了热轧精密无缝管的发展趋势。

The main calculation in the particle image matching algorithm is to have the two visual seriate images taken the cross-correlation arithmetic based on the fast fourier transform. This paper discusses the basic principle of the cross-correlation arithmetic in detail, discuss each stage of its produce and development and also discuss the thinking, the merit and the defect of each algorithm. On the base of all these discussing, we confirm our algorithm and realize it in programming with C++.

粒子图像的匹配算法的主要运算是将两连续的视频图像进行基于快速傅里叶变换的互相关运算，本文详细论述了相关算法的基本原理，它的产生和发展的各个阶段，各种算法的思路和优缺点，在此基础上确立了自己的算法并以C++编程实现。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。