One-Dimensional Electric Field Structure of an Outer Gap Accelerator

We re-study the one-dimensional electric field structure of an outer gap accelerator by considering the physical limit of trans-field height. Inside the outer gap, the charge depletion creates a large electric field along the magnetic field lines. Electrons and/or positrons are accelerated to ultra-relativistic energies by this longitudinal electric field, and then radiate γ-ray photons by curvature radiation. The collision of these γ-rays and ambient x-ray photons further produce radiating particles, resulting in a stationary gap. We solve the structure of this longitudinal electric field together with the distributions of electrons and positrons and γ-ray photons for an aligned rotator. Our results indicate that the outer gap can extend to the light cylinder using reasonable parameters.     

一维量子散射的极点与束缚态能量

讨论了一维定态薛定谔方程解的解析性质，得到了透射系数与束缚态能量的关系，并举例说明。     

从势能到扫描隧穿显微镜

以“势能及机械能守恒”教学内容为例，介绍如何将现代科学知识与技术引进到“大学物理”教学中，以达到拓展学生视野，丰富“大学物理”授课内容，为学生架起了一座联系经典物理与量子物理的桥梁．     

一维磁光子晶体的法拉第效应

由于一维磁光子晶体能同时展示出很好的光透射率和法拉第旋转,故可用于实现小尺度的磁光隔离器。采用传输矩阵法研究了由磁光膜(Bi∶YIG)和电介质膜(Ta2O5,SiO2)构成的一维磁光子晶体,分别讨论了在垂直入射和斜入射条件下的法拉第效应,并给出了几种可行性结构,对磁光隔离器件的进一步改进设计具有一定的参考价值。     

Evidence of Strong Pion Fluctuation in Jet-Like Events in ^32S-AgBr Interactions

We presents the analysis of ring-like and jet-like events in terms of Scaled Factorial Moments （SFMs） in one dimensional space up to the sixth order of moments for ^32S-AgBr interactions at 200 AGeV energy. The study reveals a power law growth of SFMs with decreasing bin width of the azimuthal distribution in the ^32S- AgBr data at 200 AGeV in both the cases. It is seen that strong intermittent pattern is revealed only in jet-like events.     

一维瞬间碰撞实验研究

在一维瞬态碰撞实验中使用了碰撞过程瞬态数字测量仪测量冲力数据,本文对实验装置及数据的采集、转换和输出进行了介绍,编写了相关的程序对碰撞开始数据进行判断,选择适当的采样周期以提高实验精度,并将实验扩展到牛顿第二定律及研究完全非弹性碰撞.     

一维δ势阱中的相对论粒子

求解一维相对粒子的Dirac方程。对一维δ势阱，计算了束缚态能级与波函数；对一维双δ势阱，给出了束缚态能级所满足的超越方程，并确定了束缚态的数目，简单讨论了散射问题。     

超急速爆发沸腾传热的实验与理论研究

超急速爆发沸腾研究具有重大理论与实用价值。本文在实验研究的基础上,建立了脉冲激光作用下超急速爆发沸腾传热数学模型,并采用恰当的数值处理方法进行了数值模拟计算。结果表明,计算与实验结果基本吻合,在超急速爆发沸腾过程中,汽相、液相的升温吸热以及汽化潜热等是影响温度变化的重要因素,实际过程中应综合加以考虑。     

重离子诱导的质粒DNA双链断裂分布研究

利用能量为7．2MeV／u氖离子束辐照体外质粒DNA:pUC18，采用恒场凝胶电泳结合多功能荧光成像系统研究了pUC18双链断裂片段的分布。证实了双链断裂片段分布的非随机性，结果还发现DNA断裂后片段的交联现象，而且交联片段的分布也是非随机的。DNA is considered to be the most important and sensitive target in biological systems. In addition to the base damage, DNA strand breaks are the major lesion in the genome due to exposure to ionizing radiation. Mutation can be introduced to DNA as a result of enzymatic processing of DNA lesions or post irradiation replication. However, the mechanisms of radiation induced mutations are not well clarified at the molecular level. To study the effect on the simple plasmid DNA of heavy ion is even predominant or more feasible. Plasmid pUC18 DNA was prepared and irradiated by neon beam (7.199 MeV/u). The fragment distributions were determined by quantifying the ethidium bromide fluorescence. It can be seen that the shape of the intensity distributions is vastly different for the used radiation Dose. The distribution produced shows an excess of fragments particularly in 3 000 and 10 000 Gy the size range between 20—40 kbp and 20—50 bp. This clustering of double stranded fragments might be influenced by the higher order chromatin structure of genomic DNA. If so, DNA loop structures could correspond to the size range for which we observed DSB clustering. Further studies aim at elucidating the heterogeneity of DSB induction within the genome and investigate the influence of chromatin structure on the non random fragment distribution.     

一维光子晶体研究简介

介绍了一维光子晶体的基本概念、特性，系统综述了对一维光子晶体的研究现状和应用前景。