群聚

强流相对论电子束的纵向自群聚

The Longitudinal Self Bunch of Intensely Relativistic Electron Beam

通过对其线路特性、高频系统中电子注的调制、群聚、电子注与高频场的互作用过程进行研究以及数值模拟，得到了一种新型的太赫兹放大器。

Transmission characteristics of the high frequency system 、 the process of modulation and bunch abut electron beam as well as interaction between electron beam and the high frequency electromagnet field have been researched . And then it is simulated by computer technology . A new terahertz amplifier is obtained .

6月底到8月初，他们群聚在海滩上。

They throng the beaches between late June and early August .

首先，对OFDM和群聚OFDM技术作了理论和数学分析；

Firstly , it analyzes the technology of OFDM and cluster OFDM basis on theory and mathematics .

群聚卫星系统参数对INSAR测高测速精度的影响

Influence of the distributed satellite system parameter to INSAR precision

通过群聚参量Bi对ICL中电子的两种不同的群聚机制进行了讨论；

Two different bunching mechanism of the electrons in ICL are discussed through the bunching parameter (?) .

最后，为正在研制中的Ka波段三次谐波倍增回旋速调管放大器设计了一种链式群聚腔。

Finally , a chain bunching cavity is designed for the developing Ka-band frequency-tripling gyroklystron amplifier .

本文利用Web网页分布群聚性的特点，结合巩固学习方法，提出了一种新的启发式搜索算法。

Based on the survey of current intelligent search engine , combined with reinforcement learning technique , the characteristic of similar web pages ' distribution is used to present a heuristic search algorithm based on simulated annealing .

在多因素模型中，随机波动模型比ARCH模型能更好的描述短期利率变化的尖峰厚尾和波动群聚特征。

Among the multi-factor models , the stochastic volatility model effectively catches the leptokurtosis and volatility clustering characters of the behavior of short-term interest rate relative to ARCH model .

微量群聚法，粒子群聚最佳化，旋转型倒单摆，LQ控制器，性能响应，线性化。

Particle Swarm Optimization , PSO , Optimal , Linearized , LQ Regulator , Rotary Inverted Pendulum System .

根据相干渡越辐射（CTR）的特性，结合FEL中电子束群聚的特点，建立了理论模型。

Theoretical model is established according to characteristics of CTR and the bunching electron beam in FEL .

数值计算结果表明，在两种情况下所得到的减光子压缩真空态当湮没光子数k为奇数时均呈现出群聚效应，而当k为偶数时呈现反群聚效应。

For both cases , the theoretical results show that for these quantum states anti-bunching effects appear when k , the number of depleted photons , are even , and bunching effects appear when k are odd .

本文研究的是适用于星-星、星-地高速数据传输的新型群聚OFDM系统，研究了系统中的同步和群聚等关键技术。

This thesis is focused on the new concept of clustered OFDM for high-speed data transmission in the Satellite-Satellite and Satellite-Earth communications , researches on the key technology of synchronization and cluster .

探讨了利用相干渡越辐射（CTR）来测量自由电子激光（FEL）群聚电子束的测量方法。

The methods are discussed on measuring bunching electron beam of Free-Electron Laser ( FEL ) by Coherent Transit Radiation ( CTR ) .

譬如说，硅谷就是挨着斯坦福大学而建的，类似的高科技群聚还有美国的mit以及英国的剑桥大学。

Silicon Valley is near Stanford University , for example , and similar high-tech clusters are gathered around MIT near Boston in the United States and around Cambridge University in Britain .

广场里有座喷泉和一家Costa咖啡厅，透过玻璃墙面望进去，可以看见男男女女在聊天。而他们不分性别群聚的方式，是住在斯瓦特的人所无法想象的。

In the square was a fountain and a Costa coffee bar with glass walls through which you could see men and women chatting and mixing in a way that would be unthinkable in Swat .

二氧化硅中可动正离子在Si-SiO2界面的定域群聚现象及其物理原因的探讨

The localized phenomena of clustering of mobile ions in sio_2 at si-sio_2 interface and the preliminary studies on its origin

虽然实验中的导电箔对电子束的通过率只有0.88，但结果表明导电箔对RKA的束流有一定聚焦作用，不影响束流群聚过程。

Although the transparancy of the foils to the beam is only 0.88 , the results show that the foils do not affect the beam bunching process .

介绍了在长脉冲强流相对论速调管（RKA）研究中强流相对论空心电子束（IREBs）的一种小信号群聚理&空间电荷波理论。

A small signal theory & space charge wave physics relevant to modulation properties of intense relativistic electron beams in klystron amplifiers is described in this paper .

通过对鱼群的群聚行为的分析，定义一个参数dist来控制搜索的范围和时间，对标准的fish-search算法进行改进，使得搜索过程能自适应地调整搜索范围。

Based on the analyze of the flock behavior of fish school , define a parameter dist to control the search range and time , improve the standard fish-search algorithm , so the search process can adjust the search range adaptively .

为何会产生股利群聚现象？本文认为，传统股利政策理论无法提出合理的解释，而引入行为因素则有助于分析这些异象产生的原因（Shefrin和Statman，1984）。

What is the origin of the dividend clustering phenomena ? Since the traditional dividend policy theories can not explain this phenomena , it will be helpful for us to introduce behavioral elements to analyse the cause of the phenomena ( Shefrin and Statman , 1984 ) .

回旋速调管放大器群聚腔高频场分析

Analysis of high frequency field in bunching cavity of Gyroklystron Amplifier

群聚球形粒子极化散射的T矩阵数值模拟

Numerical T matrix simulation for polarized scattering from clustered spherical particles

如今，研究人员找到了人们最早群聚赴宴的证据。

Now researchers have evidence for the earliest known group feasting .

在原来设计方案的基础上，对群聚段几个主要的物理参数进行了优化研究。

Based on the original design , several parameters are optimized .

强流相对论电子束群聚的空间电荷波理论分析

Space-charge Wave Physics Relevant to Modulation of Intense Relativistic Electron Beams

群聚生活，以动物和植物为食。

It lives in schools and eats plant and animal material .

增光子压缩真空态的反群聚效应

Anti - bunching Effects of the Photon - added Squeezed Vacuum States

新型回旋速调管放大器链式群聚腔的模拟与设计

Simulation and design of a novel chain bunching cavity for gyroklystron amplifier

正常和发育不良型获得性群聚性黑素细胞痣

Agminated acquired melanocytic nevi of the common and dysplastic type