求解Euler方程的隐式无网格算法

研究了求解Eluer方程的稳式无网格算法，用点云离散计算区域，代替通常的网格划分；在当地点云上，引入二次平方极小曲面逼近计算空间导数，用Roe的近似Riemann解确定通量；并用LU-SGS算法求解离散得到的Euler方程稳式时间后差联立方程组，数值模拟了二维翼型跨音速绕流，由于无网格算法区域离散只涉及点云，具有灵活性，适合处理复杂的气动外形。     

Spaceborne Laser Rangefinder “LORA” Used as a Cloud Lidar

First, in this report an overview is given on the use of the Russian laser altimeter in space “LORA” as a lidar for cloud measurements. Secondly, the influence of multiple scattering is verified by analysis of the backscatter signals from clouds having the excellent range resolution of a rangefinder.Presented at the 7th International Workshop on Multiple Scattering Lidar/Light Experiments (MUSCLE7), July 21–23 1994, Chiba, Japan.     

BEPC中的电子云不稳定性研究

多束团正电子储存环中可能发生电子云不稳定性(ECI). 自1996年起, 在北京正负电子对撞机(BEPC)上开展了与这种束流不稳定性相关的系列研究. 文章扼要介绍在BEPC上进行的电子云不稳定性研究, 包括实验观测和模拟计算, 并讨论可能的抑制措施.     

大气物理探测--卫星云图的接收与应用实验

将气象卫星云图的接收与应用开设为高校近代物理实验 ,可以使学生了解卫星遥感探测技术、卫星云图的接收、云图的特征和云图的识别方法 ,对拓宽学生的知识面 ,培养学生的综合能力是很有益的 .本文介绍了气象卫星遥感大气和卫星云图接收机的基本原理 ,以及实验内容与要求 .     

Small angle neutron scattering from micellar solutions of triton X-100

Micellar solutions of non-ionic surfactant triton X-100 (8% by weight) show phase separation at cloud pointT _cp ～ 335 K. This paper reports results of small angle neutron scattering (SANS) experiments from this solution as a function of temperature between 298 and 332 K. The range of wave-vector transferQ, covered in these experiments is from 0.02 to 0.15 Å^?1. It is seen that as one approachesT _cp, the neutron scattering cross section diverges in the region of lowQ (<0.06 Å^?1) while it is independent of temperature in region of largeQ(>0.06 Å^?1). We believe that the divergence of scattering at lowQ with an increase in temperature is because of changes in the structure factorS(Q) of the solution. The measured distributions have been analyzed using four different models for inter-micellar potential. The models used to calculate the structure factorS(Q) are (1) mean spherical approximation (MSA) with Yukawa tail for attractive potential, (2) MSA with an attractive square well potential, (3) random phase approximation (RPA) with an attractive square-well potential and (4) Sticky hard sphere model (attractive square-well potential with Percus-Yevick approximation). The strengths of the attractive potential required to fit the SANS data are (?6.6 to ? 14.4)/kt for model (1), (? 6.6 to ? 15.0)/kt for model (2), (? 3.8 to ? 7.3)/k _B T for model (3) and (?2 to ?2.7)/kt for model (4). On the basis of reasonableness of the derived strength of the potential near the phase separation temperature and its relative temperature dependence, it is concluded that present data favour the Sticky hard sphere model.     

The effects of various foreign substances on the cloud point of Triton X 100 and Triton X 114

The nonionic surfactants Triton X 100 and Triton X 114 form isotropic micellar solutions around 25°C. One of the characteristic features of these solutions is the fact that at higher temperatures they undergo clouding and liquid-liquid phase separation. Addition of various additives to the surfactant solutions does change the temperature at which the clouding phenomenon occurs. In this paper such effect of additives on the clouding phenomenon of Triton X 100 and Triton X 114 are discussed.     

Tb3+离子4f75d组态能级的电子云扩大效应

研究了电子云扩大效应对Tb3+离子5d能级的影响. 利用光谱理论, 将电子云扩大效应比率β同Tb3+离子4f75d组态的自旋允许和禁阻跃迁能级的能级差联系起来, 通过复杂晶体化学键理论确定了化学键的共价性、 相应键体积极化率以及配体离子的有效电荷与β的线性关系, 同时得到了对β有影响并与Tb3+离子自身相关的因子.     

基于Hadoop的大数据信息安全监控云平台设计与研究

针对传统的大数据信息监控云平台模式单一、虚拟化程度不高,容易导致信息泄露的问题,为了提高对大数据的信息安全溯源能力,提出基于Hadoop的大数据信息安全监控云平台设计方法。在信息资源云体系下构建大数据信息安全融合模型,通过信息挖掘与匹配方法把云平台中的数据资源、物理资源进行关联性整合,方便数据安全溯源,在Hadoop平台下构建多源信息资源云,建立用户接口注册机制,采用虚拟化技术进行信息保护,实现在云平台下进行信息安全溯源。实验结果表明,采用该方法进行大数据信息安全溯源,大数据信息分类存储性能较好,对异常数据挖掘精度较高。具有较好的信息安全保护能力,确保了信息安全。     

无限深势阱问题的可视化研究

基于计算软件对一些常见的无限深势阱进行了可视化研究,并设计了GUI界面实现对势阱的选择.在选定势阱后,设置好相应的势阱参数和量子数,便可依次绘制出低维势阱的波函数、概率密度函数和三维势阱中的电子云图像.文中分析了二维和三维势阱中能级的简并度问题,并重点讨论了不同势阱波函数和概率密度函数随量子数的变化规律.将势阱问题可视...     

Study of Electric Polarizabilities of Nucleon with a Constituent Quark Model and Pion Meson Cloud

In this work, a subtle role of the pion meson cloud effect on the electric polarizabilities of the proton and neutron is stressed. It is shown that the electric polarizabilities of the proton and neutron, and the difference between the electric polarizabilities of the proton and neutron can be explained by including the pion meson cloud explicitly. However, the magnitude of the estimated mean-square charge radius of the neutron is still far from the measurement.