搜索结果: 1-13 共查到“知识库 无线电物理其他学科”相关记录13条 . 查询时间(2.551 秒)
2D electrical resistivity tomographies for investigating recent activation landslides in Basilicata Region (Southern Italy)
landslides electrical resistivity tomography
2015/9/1
The results of a geoelectrical survey in the study of recent activation landslides in the Lucanian Apennine chain
(Southern Italy) are discussed in this paper. During the last two years, after meteor...
基于拥塞控制的无线传感网蚁群最优化路由协议
无线传感网络 拥塞信息 高效节能蚁群路由 改进的EEABR
2013/12/4
无线传感网络（wireless sensor network，WSN）存在网络拥塞问题，并且网络的拥塞会造成丢包和能量的急剧损耗.针对网络拥塞问题，在高效节能蚁群路由(energy-efficient ant-based routing，EEABR)算法的基础上，提出基于拥塞控制的EEABR路由协议的改进的EEABR(improved EEABR，IEEABR)算法，该算法的核心是利用媒体访问控制...
Measurements of production cross sections and polarizations are essential inputs for a theoretical understanding of heavy vector meson production.
Landauer Transport Model for Hawking Radiation from a Black Hole
Landauer Transport Model Hawking Radiation Black Hole
2010/10/27
We investigate the Hawking radiation energy and entropy flow rates from a black hole viewed as
a one-dimensional (1D) Landauer transport process. The conformal symmetry in the near-horizon
region le...
Entanglement can increase asymptotic rates of zero-error classical communication over classical channels
Entanglement asymptotic rates zero-error classical communication classical channels
2010/10/18
It is known that the number of di erent classical messages which can be communicated
with a single use of a classical channel with zero probability of decoding error can sometimes
be increased by us...
Envelope Soliton Oscillator for UWB
Envelope Soliton Oscillator nonlinear transmission line
2010/4/6
An electronic oscillator is shown to support an envelope soliton pulse. The oscillator comprises a loop, formed by a nonlinear transmission line, an amplifier, a bandpass filter and a saturable absorb...
Studies on RFQ accelerators and its applications
RFQ integral split ring RFQ mini-vane RFQ separated function RFQ four-vane RFQ
2009/9/17
Development activities of Radio Frequency Quadrupole (RFQ) accelerators in China are presented. A 1 MeV O+ RFQ and a 3.5 MeV ADS proton RFQ have been constructed. A novel separated function RFQ is und...
“邻居单元”为基础的预条件方法及其应用
预条件方法 共轭梯度方法 基站天线
2009/5/13
该文提出了一种具有物理意义的预条件方法--"邻居单元"为基础的预条件方法。该方法充分考虑了矩阵元素中的"主要"信息量,可以有效加快迭代收敛速度。在构造预条件因子时,采用从目标的"几何结构剖分"出发,而不是从"矩阵元素"出发确定"基权函数之间的作用量关系",这样保证了构造预条件矩阵的计算复杂度仅为O(N)。作为实例,该文将这种预条件方法与共轭梯度方法结合应用于矩量法基站天线分析所得方程的求解,数值结...
该文将超松弛重叠及非重叠区域分裂法(DDM)与矢量有限元方法(EB-FEM)、边界积分方程(BIE)法相结合对三维电大尺寸开口腔体的电磁(EM)散射特性进行分析。通过DDM将原腔体分解成若干子腔体，在各子腔体内应用EB-FEM进行分析。腔体间应用矢量传输条件进行耦合，最终腔体内电场分布通过迭代获得。在原腔体口面，运用积分方程进行描述。在分析过程中，将传输条件和BIE统一成第三类边界条件形式。最后给...
液晶光学相控阵可编程光束偏转研究
光学相控阵 液晶 光束偏转
2009/3/9
研究了一种一维透射式向列相液晶光学相控阵.建立了器件的数学模型,根据Frank-Oseen液晶连续体弹性形变理论计算了电场作用下液晶指向矢分布,定量分析了器件的相位延迟及衍射特性.研制了含1 024个驱动电极的实际器件,由FPGA对电极驱动电压进行可编程控制.经实验测试,该器件可以实现60个角度的准连续随机可编程电控偏转与扫描,最大偏转角度为2.001 4°.根据器件的理论模型,对光束偏转的衍射效...
等离子体涂层椭球目标的电磁散射
等离子体 涂覆椭球 电磁散射
2009/1/30
采用椭球坐标系下的分离变量法，结合介质和目标的边界条件导出了涂层导体椭球的电磁散射场计算公式，将入射场、散射场和内场分为轴对称和非轴对称两部分，数值计算了涂敷椭球粒子的单、双站散射截面的角分布，讨论了散射截面随入射波频率、等离子体碰撞频率、电子浓度和涂层厚度的变化规律，对等离子涂层目标的隐身技术研究有一定意义．
Production of YBCO Superconductor Sample by Powder-In-Tube Method (PITM); and Effect of Cd and Ga Doping on the System
Superconducting composites YBCO composition Powder-In-Tube method Cd and Ga doping
2010/4/8
In this study, YBa2Cu3O7-d and Y0.5X0.5Ba2Cu3O7-d (x = Ga, Cd) compounds are produced by Powder-In-Tube Method and electrical and physical characteristics of those samples were investigated. Following...
Mathematical Modeling of Plasmachemical Processes
Methane acetylene radio frequency discharge energy efficiency vibration-translational nonequilibrium
2010/4/13
In this research, we studied the kinetics of plasmachemical processes in quasiequilibrium and nonequilibrium conditions. The example of methane conversion into acetylene showed that the most efficient...