Franck-Hertz实验曲线的统计解释

用电子数按能量的分布解释Ｆ－Ｈ实验曲线极大值和极小值的形成原因     

微机与碰撞过程的研究

一、前言微机在物理实验教学中不仅用于处理实验数据,而且用于数据采体、实验控制。微机应用于物理实验教学,把有些难以观测的量变得容易,把有些难以控制的实验变得易于操作,拓宽了实验题目及内容的选择,使物理实验的思想更突出,物理图象更清晰,有助于教学效果的提高。     

基于圆柱体骰子三面概率落地均匀性探究

传统硬币正反面落地概率分别趋近于1/2,而侧面落地概率几乎为0.本文为了探究新型圆柱形骰子三面落地概率均匀的影响因素,从力学角度对圆柱形骰子发生弹性碰撞和非弹性碰撞的运动过程进行了理论分析,将影响落地概率均匀性的因素分为圆柱形骰子自身的物理和几何特征以及外部影响因素,通过建立各类圆柱形骰子模型,采用控制变量法进行实验,并应用软件进行仿真模拟,所得实验结论和仿真结论与理论分析吻合.研究表明骰子厚度直径比、接触面材质硬度、抛掷高度及圆柱体重心线与竖直方向向量夹角是影响落地概率均匀性的主要因素.     

仅内力作功时完全非弹性碰撞问题的解

本文给出了二质点在完全非弹性碰撞过程中，仅有内力作功时动能变化的表达式，并据此讨论了两个具体问题．     

FE-89程序及其对高速碰撞问题的数值模拟

本文简要地介绍了二维流体-弹塑性流FE-89程序的方法特点,给出了检验模型的计算与实验结果的比较,模拟计算了厚组合飞片与薄壁园筒的高速碰撞问题,给出了基本图象和部分定量结果。     

高能轻子–核碰撞中簇射粒子的研究

在高能轻子-核碰撞中,基于二源发射图象描述了簇射粒子多重数和赝快度分布,计算结果与3-210GeV的中微子-核乳胶碰撞的实验数据符合.     

从总动能变化特点考察一维两体对心碰撞

分析了完全弹性碰撞、完全非弹性碰撞、击穿碰撞和放能碰撞过程中的能量变化特点,引入等动量线、等动能线作为各种碰撞的判据．     

4N核弹性碰撞的激发函数

¹⁶O+²⁰Ne弹性碰撞的激发函数呈现出共振结构,基于核分子轨道理论对共振结构进行了研究,理论结果与实验数据很好的一致.     

超弹性碰撞实验最佳工作条件分析

超弹性碰撞演示实验是灵活运用大学物理知识的典型实验,本文对其最佳工作条件进行了分析,研究表明,当大球和小球的质量比为3时可以达到最佳的实验效果．     

高能轻子－核碰撞中簇射粒子的研究

在高能轻子－核碰撞中，基于二源发射图象描述了簇射粒子多重数和赝快度分布，计算结果与３－２１０ＧｅＶ的中微子－核乳胶碰撞的实验数据符合．     

Induced Chern-Simons Term in Three-Dimensional Space at High Temperature

Perturbative calculations of the high temperature ground-state axial vector current of fermion fields coupled to gauge fields lead to an appearance of an additional anomalous Chern-Simons topological mass term in three-dimensional effective action. In Abelian case contributions come only from the vacuum polarization graph, and in non-Abelian case contributions come from the vacuum polarization graph and the two triangle graphs.     

应用SPH方法对平板铅飞层对碰凸起动载行为的数值模拟研究

采用光滑粒子流体动力学(SPH)方法,模拟研究了两点起爆圆柱炸药驱动组合飞层(铝+铅)的动载行为,得到了爆轰波对碰区铅飞层类似射流状超前凸起的计算图像。模拟结果表明,对碰凸起呈现与实验结果相同的分层结构,且凸起头部具有散碎特征,根部相对密实。因此,SPH方法能够较好地模拟铅这类低熔点、低强度金属在对碰区中出现的散碎等破坏现象。     

Spin-dependent thermoelectric effect and spin battery mechanism in triple quantum dots with Rashba spin-orbital interaction

We have studied spin-dependent thermoelectric transport through parallel triple quantum dots with Rashba spinorbital interaction(RSOI) embedded in an Aharonov-Bohm interferometer connected symmetrically to leads using nonequilibrium Green's function method in the linear response regime.Under the appropriate configuration of magnetic flux phase and RSOI phase,the spin figure of merit can be enhanced and is even larger than the charge figure of merit.In particular,the charge and spin thermopowers as functions of both the magnetic flux phase and the RSOI phase present quadruple-peak structures in the contour graphs.For some specific configuration of the two phases,the device can provide a mechanism that converts heat into a spin voltage when the charge thermopower vanishes while the spin thermopower is not zero,which is useful in realizing the thermal spin battery and inducing a pure spin current in the device.     

强流相对论性电子束在真空漂移管中的传输

本文给出了40kA,880kV,脉冲宽度为100ns的强流相对论性电子束(IREB)在无外加磁场的真空金属漂移管中传输特性的研究结果。实验证实了束流在传输过程中净电流倍增现象的存在以及L.S.Bogdankevich等人对空间电荷极限电流的理论估计。理论上解释了净电流倍增及其明显滞后、上升时间缩短和脉宽变窄等现象。     

Effect of Inter-System Coupling on Heat Transport in a Microscopic Collision Model

In this paper we consider a bipartite system composed of two subsystems each coupled to its own thermal environment. Based on a collision model, we mainly study whether the approximation (i.e., the inter-system coupling is ignored when modeling the system–environment interaction) is valid or not. We also address the problem of heat transport unitedly for both excitation-conserving system–environment interactions and non-excitation-conserving system–environment interactions. For the former interaction, as the inter-system interaction strength increases, at first this approximation gets worse as expected, but then counter-intuitively gets better even for a stronger inter-system coupling. For the latter interaction with asymmetry, this approximation gets progressively worse. In this case we realize a perfect thermal rectification, and we cannot find an apparent rectification effect for the former interaction. Finally and more importantly, our results show that whether this approximation is valid or not is closely related to the quantum correlations between the subsystems, i.e., the weaker the quantum correlations, the more justified the approximation and vice versa.     

HL-2A装置中性束离子源引出系统束流分析

在中性束离子源引出过程中,详细分析了引出束流的产生,这有利于得到更准确的引出功率和引出电极表面的热功率沉积情况。根据HL-2A装置中性束离子源引出电极的电连接方式和束流引出的物理过程,对离子源束流引出过程进行了分析,给出抑制极电流产生的主要来源。通过分析放电气压扫描实验中的结果发现:随着放电气压的增加,不同弧放电电流情况下抑制极电流均逐渐增加,且抑制极电流与引出电流的比值近似线性增加。针对引出离子束流经过引出电极的过程建立了物理模型。计算了抑制极电流与引出电流的比值与放电气压的依赖关系,计算结果与实验结果一致,验证了引出束流分析结果的合理性。     

蒙特卡罗碰撞算法在CHIPIC软件中的数值实现

分析离子源中电子所参与的碰撞,利用电子与其它粒子间的空碰撞模型,研究电子之间的库仑碰撞,采用不同的存储和调用机制研制了两种碰撞模型的蒙特卡罗碰撞处理模块,将数值模块添加到粒子模拟软件CHIPIC中,对离子源JAERI 10A进行模拟验证,通过对模拟结果的分析,表明所设计的三维MCC算法正确.     

跟踪碰撞的图形描述

借碰撞的图形描述法,澄清了碰撞分类中的一些相关问题。     

Fast-scale border collision bifurcation in SEPIC power factor pre-regulators

In this paper we report a kind of fast-scale instability occurring in the single-ended primary inductance converter （SEPIC） power factor pre-regulator, which is designed to operate in discontinuous conduction mode. Main results are given by exact cycle-by-cycle computer simulations as well as theoretical analysis. It is found that the instability phenomenon manifests itself as a fast-scale bifurcation at the switching period, which implies the occurrence of border collision bifurcation, or is related to the transition of the regular operating mode of the SEPIC. According to the theoretical analysis and simulation results, the effects of parameters on system stability, and the locations of the bifurcation points are confirmed. Moreover, the effects of such an instability on power factor and switching stress are also discussed. Finally, the occurrence of the asymmetric bifurcation locations is investigated. The results show that this work provides a convenient means of predicting stability boundaries which can facilitate the selection of the practical parameters.     

Modeling complex networks with self-similar outerplanar unclustered graphs

This paper introduces a family of modular, self-similar, small-world graphs with clustering zero. Relevant properties of this family are comparable to those of some networks associated with technological systems with a low clustering, like the power grid or some electronic circuits. Moreover, the graphs are outerplanar and it is know that many algorithms that are NP-complete for general graphs perform polynomial in outerplanar graphs. Therefore the graphs constitute a good mathematical model for these systems.