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Branching Patterns and Stepped Leaders in an Electric-Circuit Model for Creeping Discharge
Branching Patterns Stepped Leaders Electric-Circuit Model
2010/4/21
We construct a two-dimensional electric circuit model for creeping discharge. Two types of discharge, surface corona and surface leader, are modeled by a two-step function of conductance. Branched pat...
Geometrical origin of chaoticity in the bouncing ball billiard
Geometrical origin ball billiard neighbouring trajectories
2010/4/2
We present a study of the chaotic behavior of the bouncing ball billiard. The work is realised on the purpose of finding at least certain causes of separation of the neighbouring trajectories. Having ...
Bunch length measurement using a traveling wave RF deflector
RF deflector bunch length RF gun HEM11 mode
2009/12/24
RF deflectors can be used for bunch length measurement with high resolution. This paper describes a completed S-band traveling wave RF deflector and the bunch length measurement of the electron beam p...
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...
Dynamo Onset as a First-Order Transition: Lessons from a Shell Model for Magnetohydrodynamics
First-Order Transition Magnetohydrodynamics
2010/4/8
We carry out systematic and high-resolution studies of dynamo action in a shell model for magnetohydrodynamic (MHD) turbulence over wide ranges of the magnetic Prandtl number $Pr_{\rm M}$ and the magn...
Multi-soliton, multi-positon, multi-negaton, and multi-periodic solutions of the coupled Volterra lattice equation
Multi-soliton multi-negaton multi-positon
2010/4/7
This paper aims to find new explicit solutions including multi-soliton, multi-positon, multi-negaton, and multi-periodic for a coupled Volterra lattice system which is an integrable discrete version o...
Right on time: Measuring Kuramoto model coupling from a survey of wristwatches
couple doscillators Kuramoto model complex networks synchro-nization
2010/4/7
Using a survey of wristwatch synchronization from a randomly selected group of independent volunteers, one can model the system as a Kuramoto-type coupled oscillator network. Based on the phase data, ...
电磁波在湍流介质中的衰减效应
电磁波 湍流 闪烁
2009/10/29
研究了大气湍流对电磁波的衰减，得出了有关精确表达式，计算结果表明自由空间的平均大气起伏常数为1O ，应用所得结果导出了闪烁指数理论公式，数值计算与文献一致。
铷原子频标赝温度系数研究
铷原子频标 温度系数
2009/10/28
提出了一种测量铷原子频标赝温度系数的方法，该方法具有灵敏度高、简便、快速的特点. 分析了赝温度系数的物理机理，指出了克服赝温度系数的技术对策. 实验结果表明，通过加热器的合理设计，赝温度系数可以降低1到2个量级.
时序雷达干涉图中的永久散射体(PS)可看作“天然GPS点”, 以构成网络用于监测长期的地表形变. 本文提出采用邻接矩阵拓扑模型对基于Delaunay剖分算法生成的PS网络进行基线识别, 并采用时序相干最大化算法求解PS基线的线性形变速度增量和高程误差增量. 该数据模型和计算方法被应用于探测香港地区2006~2007年间的区域地表沉降. 实验研究采用由Envisat卫星ASAR传感器对该地区成像所...
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...
电磁波在磁性分层薄膜中的传播——非互易反射
电磁波传播 磁性多层膜 电磁波透射和反射
2009/9/1
本文采用传输矩阵研究了电磁波在磁性多层膜和超晶格中的透射和反射,获得了层状磁性介质的透射和反射系数,包括:(1)半无限磁性表面,(2)磁性多层膜,(3)半无限磁性超晶格。数值计算结果表明,磁性分层系统中电磁表面模可以通过电磁波斜入射在膜面上而激发出来,表现为S-极化反射曲线的“尖谷”,因此,本文指出电磁波传播的色散曲线可以用一种类似衰减全反射(ATR)的技术来测量。
电磁波在对流层中传播的抛物化方程的有限差分解法
电磁波传播 有限差分法 箱式差分格式
2009/9/1
本文用箱式格式的有限差分法求解了电磁波在对流层中传播的抛物化波动方程。文中给出了该隐式格式的相容性、稳定性以及收敛性的证明和算例。典型算例表明,本文的方法可准确计算大气波导沿高度和距离方向变化的影响,较之目前普遍使用的傅立叶分裂步方法具有准确和处理边界条件方便之优点。
半空间电大导体目标散射的高频分析方法
图形电磁学 半空间格林函数 半空间物理光学方法
2009/8/31
该文研究了半空间电大尺寸导体目标散射的高频求解方法。将半空间并矢格林函数引入物理光学方法中，对半空间环境影响进行考虑，推导出半空间物理光学分析方法，并结合图形电磁学(GRECO)，对半空间电大导体目标进行消隐判断，提取像素面元法矢量和深度缓存等有效信息，快速有效地计算了半空间导体目标的雷达散射截面(RCS)，数值结果证明该文方法的有效性和准确性。