气体放电中纳秒脉冲波形的实验研究

在利用示波器测试交流电弧发生器的一级放电回路的振荡波形时,在主振荡波形中观测到纳秒脉冲振荡波形.针对纳秒脉冲振荡波形进行了实验研究和初步的理论分析,所采用的实验方法能够为气体放电的纳秒脉冲研究提供一种新的实验依据.     

Stochastic Dynamics of Discrete Curves and Multi-Type Exclusion Processes

This study deals with continuous limits of interacting one-dimensional diffusive systems, arising from stochastic distortions of discrete curves with various kinds of coding representations. These systems are essentially of a reaction-diffusion nature. In the non-reversible case, the invariant measure has in general a non Gibbs form. The corresponding steady-state regime is analyzed in detail, by using a tagged particle together with a state-graph cycle expansion of the probability currents. As a consequence, the constants appearing in Lotka–Volterra equations—which describe the fluid limits of stationary states—can be traced back directly at the discrete level to tagged particle cycles coefficients. Current fluctuations are also studied and the Lagrangian is obtained via an iterative scheme. The related Hamilton–Jacobi equation, which leads to the large deviation functional, is investigated and solved in the reversible case, just for the sake of checking.     

Neural networks prediction of different frequencies’ effects on calcareous deposits formation under pulse cathodic protection

This paper deals with the calcareous deposition by using pulse cathodic protection on steel structures submerged in the synthetic sea water. In order to fully characterize the complex underlying mechanism of this process and evaluate the effects of a thorough range of frequencies, a prediction model is developed using a hybrid of Neural Networks and Genetic Algorithms (GA). Process variables, i.e. time, frequency and final required current, have been experimentally studied with the aid of chronoamperometric technique. A portion of this dataset is used to train the prediction model, while the rest is set aside to test its predictive performance. This hybrid Neural Networks model uses GA to achieve its optimal architecture for prediction. Finally, it is concluded that the proposed model has an excellent prediction capability of final current density in the various range of frequencies by comparing the results with the experimental data. Published in Russian in Elektrokhimiya, 2008, Vol. 44, No. 10, pp. 1198–1204. The text was submitted by the authors in English.     

Effects of Trapped Electrons on Off-axis Lower Hybrid Current Drive

The effects of trapped electrons on off-axis lower hybrid current drive （LHCD） in tokamaks are studied. The influence of the resonance regime on the current drive efficiency as well as the influence of trapped particle fraction on the current drive efficiency are emphasized.     

硅酸铋晶体内电光、磁光相互作用的耦合波分析及其传感应用

通过建立并求解硅酸铋(BSO)晶体内电光、磁光相互作用的耦合波方程,得到了BSO晶体的偏振传递函数,由此分析了BSO晶体内偏振光的周期性变化规律,并给出直接描述外加电场、磁场对偏振光作用的琼斯矩阵和米勒矩阵.最后设计了一种基于BSO晶体的电压、电流同时传感系统.     

Conductivity effect in electrorheological fluids

Based on conduction model and cubic particle model, the relationship between current density and shear yield stress of electrorheological (ER) fluids was calculated and compared with some reported experimental results. The conductivity of the insulating oils is found to have been changed by the mixed particles. Several ways to decrease insulating liquid conductivity and increase the conductivity ratio of ER fluids have been proposed to prepare ER fluids with high shear yield stresses but low current densities.     

横向交、直流电流对蓝青铜K0.3MoO3的I-V特性的调制效应

通过I-V特性测量，研究了横向交、直流电流对蓝青铜K_0.3MoO₃中电荷密度波(CDW)动力学行为的影响.实验结果表明，无论是直流还是交流，随着横向调制电流的增大，CDW滑移的阈值电场均会相应地减小；但横向交流电流的调制效应较小，可能更接近本征的效应.考察了横向交流电流的调制效应与其频率的依赖关系. 关键词： 0.3MoO₃单晶')" href="#">K_0.3MoO₃单晶 电荷密度波 横向电流调制效应     

硅多条探测器的研制和初步应用

描述了用微电子工艺技术成功研制硅多条探测器的制备工艺技术及测试结果. 这种探测器的灵敏面积为50mm×20mm. P掺杂面被等分成相互平行的，长度为20mm，宽度为3mm的16条，相邻条之间的间距为140μm. 当探测器工作在全耗尽偏压下，每一条的反向漏电流的典型值<2nA.239Pu α粒子的能量分辨为0.5%-0.9%，相邻条之间的相互影响(crosstalk)为4%-8%. 用于 7.2 MeV/u的C束离子测量，得到能量分辨为0.27%.     

介观多环耦合系统中的量子电流增强效应

基于电荷具有离散性的事实对介观电路进行量子化，以介观三环为例研究多环耦合系统中的量子电流增强效应.结果表明，量子电流增强效应不仅存在于耦合双环系统中，而且在金属多环系统中也存在. 关键词： 介观电路 耦合系统 量子电流 增强效应