Scalar contribution to the BFKL kernel

The contribution of scalar particles to the kernel of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation is calculated. A great cancellation between the virtual and real parts of this contribution, analogous to the cancellation in the quark contribution in QCD, is observed. The reason of this cancellation is discovered. This reason has a common nature for particles with any spin. Understanding of this reason permits to obtain the total contribution without the complicated calculations, which are necessary for finding separate pieces.     

Charge sensitivity of single-electron transistor with superconducting electrodes

The noise-limited charge sensitivity of a single-electron transistor with superconducting electrodes operating near the threshold of quasiparticle tunneling, can be considerably higher than thatof a similar transistor made of normal metals or semiconductors. The reason is that the superconducting energy gap, in contrast to the Coulomb blockade, is not smeared by the finite temperature. The same reason leads to the increase of the maximum operation temperaturedue to superconductivity.     

由压力引起的破裂问题研究

通过力学分析,说明了水结冰后导致水管、水缸等破裂的现象和力学本质,并应用该结果讨论了拱形建筑的拱顶破坏.     

大学物理实验多感官参与性教学实践与探索

通过对非物理专业本科学生大学物理实验课成绩的分析以及对学生物理实验课学习情况的调查,发现学生对多感官参与性实验、计算机仿真实验等有着强烈的学习兴趣。剖析了学生实验课成绩偏低的原因,并对非物理专业物理实验课教学改革作了一些尝试,提出了一些新的教学设想。     

Study of polarization control model for piezoelectric actuator

A major deficiency of piezoelectric actuator is that their control accuracy is seriously limited by hysteresis. In this paper, the reason why hysteresis can be reduced by controlling polarization is explained according to the analysis of microscopic polarization mechanism and domain wall theory of piezoelectric actuator. The reason of occurring hysteresis in voltage control mode is also given. Then a control model based polarization is derived. In order to evaluate its effectiveness, the control method based on polarization is realized by controlling the charge of piezoelectric actuator. The experimental results show that the polarization control method is significantly more linear and less hysteresis than the voltage control method.     

51 V GaN基高压LED的热分析

设计并制备了51 V高压LED。对器件进行了大电流冲击试验并对器件的损毁原因进行了分析。运用有限元分析软件ANSYS对LED关键结构部位进行参数化建模及热分布模拟,得到其稳态的温度场分布;然后经过与红外热像仪成像图对比,得出电极烧毁的原因在于芯粒连接处的电极过薄过窄而导致的电阻过大,为后续设计更可靠的高压LED提供了参考。对芯片分别进行蓝光及色温5 000 K的白光封装,并分别测量了热阻,涂覆荧光粉的白光灯珠的热阻要比没有涂覆荧光粉的蓝光灯珠高约4℃/W。同时,51 V高压LED的热阻比1 W大功率LED要高,说明高压LED的散热性能比常规LED要差,这可能与高压LED具有深沟槽及众多的互联电极结构有关。     

一个地球自转变化问题引起的思考

探索汽车向北行驶时引起地球动能变化的动力学原因.     

基于液晶相控阵的聚焦式相干合成建模及性能

提出一种相干激光聚焦式传输进行相干合成的方法。通过液晶相控阵波束方向控制技术,可以在目标区域内的任意位置进行相干合成。基于实际参数,建立相干合成理论模型,在此模型下5束相干激光在距离为100m、坐标为2m的位置进行相干合成后,激光的峰值光强增加到单束激光的16.9倍。研究了目标区域内不同位置的峰值光强变化规律,分析发现光束抖动的直接原因是出射激光的相位面产生畸变,深层原因是电压量化引起的相位延迟误差。量化位数小于16时,增加量化位数可以显著减小位置误差,提高峰值光强;量化位数大于16时,量化位数不再是位置误差的主要原因。传播距离大于5000m时聚焦式相干合成可等效为平行式相干合成,N束激光合成后峰值光强接近单束激光的N2倍。     

合肥光源BPM真空室位移的测量与分析

合肥光源电子储存环的束流水平轨道存在缓慢漂移现象, 本文针对这一现象进行了束流位置检测器(BPM)真空室形变、位移和温度等参数的测量. 通过这些测量, 分析了BPM真空室的形变、位移、温度以及束流轨道漂移与束流流强的关系, 对束流水平轨道的漂移现象做出合理的解释, 即导致轨道水平漂移的主要原因是同步光热效应导致BPM真空室水平移动, 提出了采用补偿方法对BPM的轨道测量值进行实时修正, 从而提高了慢速轨道反馈系统有效性.     

Comparison of surface damage under the dry and wet impact: Molecular dynamics simulation

Molecular dynamic simulation was applied in analyzing the difference of surface damage during the impact of a large silica cluster on a crystal silicon substrate in dry and wet condition, respectively. The simulation results show that the damage of silicon substrate under the dry impact is more severe than that under the wet impact. A reason is that the water film buffers the impact of the incident cluster at the init stage under the wet impact. The more important reason is that the water film might be solidified into a continuous thin film at the cluster deformation stage. So, the considerable great impact energy of the cluster will be absorbed by the water film and transformed into thermal dissipation of energy between the simulation ensemble and the water film.     

定向运动的气体分子的麦克斯韦速度分布

指出并解决了有关文献在定向运动的气体分子的麦克斯韦速度分布推导中存在的一个问题．     

瞬态大电流测量结温中校温曲线弯曲现象的研究

利用脉宽250 μs、占空比5%的0–1.5 A脉冲电流, 分别在50, 70, 90, 110, 130 ℃条件下, 对TO-247-2L封装型PIN快恢复二极管大电流下的校温曲线进行了测量分析. 研究发现, 恒定大电流条件下, 二极管的校温曲线随温度变化发生弯曲. 分析表明, 弯曲现象主要是由于串联电阻受迁移率的影响随温度发生变化而引起的. 通过实验测量及理论计算, 得到了准确的非线性校温曲线, 从而减小了瞬态大电流测量结温中的误差.     

A new method for generation of synchronized capacitive sparks of low energy. Reconsideration of previously published findings

Using the spark generator of Randeberg et al., Randeberg and Eckhoff found a MIE of pre-mixed propane/air of <0.1 mJ, as opposed to the standard value 0.25 mJ. Literature studies revealed that this discrepancy was not a spark duration effect. The reason was a previously undetected subtle, but indeed significant, additional energy contribution. Therefore, the actual spark energies used by Randeberg et al. were considerably larger than the spark energies quoted by them. A main aim of the present paper is to explain the reason for this and to indicate a possible solution.     

交流约瑟夫逊效应与锁频现象

微波辐照下交流约瑟夫逊效应的夏皮罗台阶是非线性耗散动力学系统的锁频现象．本文在简介锁频现象的基础上，阐明夏皮罗台阶的成因．     

IBr分子含时波包的理论探究

本文主要对IBr分子的飞秒含时光电子能谱进行了模拟计算.运用含时量子波包方法,对不同延迟时间的光电子能谱进行模拟计算与理论分析.应用波包和光诱导势理论,对光电子能谱共同的两峰系特征及多峰现象给予合理解释.光电子能谱的峰值随延迟时间的增加而递减现象,是由于波包在势能面上因分子解离发散,使整个波包在势能曲线上的振荡递减造成的.研究表明：波包的传播是一个能量减弱的过程;跃迁过程中不同电离通道之间的竞争,也对能谱存在一定的影响.     

IBr分子含时波包的理论探究

本文主要对IBr分子的飞秒含时光电子能谱进行了模拟计算.运用含时量子波包方法,对不同延迟时间的光电子能谱进行模拟计算与理论分析.应用波包和光诱导势理论,对光电子能谱共同的两峰系特征及多峰现象给予合理解释.光电子能谱的峰值随延迟时间的增加而递减现象,是由于波包在势能面上因分子解离发散,使整个波包在势能曲线上的振荡递减造成的.研究表明：波包的传播是一个能量减弱的过程;跃迁过程中不同电离通道之间的竞争,也对能谱存在一定的影响.     

热容模式下激光介质的动态光学畸变

 开展了热容模式下激光介质动态光学畸变研究，初步分析了温度梯度、光弹效应及介质端面变形对整个波前畸变带来的影响，并将光学畸变转化为谐振腔损耗，数值模拟了热容激光器输出功率随时间的变化规律，模拟结果表明：当激光器工作温度低于400 K时，由粒子数玻耳兹曼分布引起的功率下降可以忽略，动态热效应是实验中热容激光器输出功率随时间快速下降的原因。     

变色的ZnS：Mn/SrS：Ce/ZnS：Mn薄膜电致发光的研究

利用ZnS:Mn/SrS:Ce/ZnS:Mn多层结构,得到了一种可变颜色的薄膜电致发光器件。研究了这一器件的发射光谱随电压和频率的变化,并讨论了随电压的增加,发射光谱中蓝带和黄带的不同增长的原因,以及在不同电压下,发射光谱中蓝带和黄带随频率变化的不同趋势的原因。观察到随驱动频率的增加,发射光谱出现黄-蓝色位移。     

Lepton and quark symmetry in weak and electromagnetic interactions

We discuss a three-quark model motivated by lepton-quark analogy. An advantage of this model is that there is no hypercharge-changing neutral current, but Cabibbo suppression has to be explained by dynamical reason.