Correlation between Symmetry Energy and Collective Flow in Heavy-Ion Collisions Induced by High Energy Radioactive Beams

Using an isospin- and momentum-dependent hadronic transport model, we investigate effects of the symmetry energy on several collective flows in heavy-ion collisions induced by radioactive beams at intermediate energies. It is found that the neutron-proton differential directed flow and the neutron-proton differential elliptic flow are strongly correlated with the symmetry energy, while the position averaged radial flow is weakly correlated with the symmetry energy.     

Influence of shape anisotropy on microwave complex permeability in carbonyl iron flakes/epoxy resin composites

To explore the mechanism of carbonyl iron flake composites for microwave complex permeability, this paper investigates the feature of the flakes. The shape anisotropy was certified by the results of the magnetization hysteresis loops and the Mossbauer spectra. Furthermore, the shape anisotropy was used to explain the origin of composite microwave performance, and the calculated results agree with the experiment. It is believed that the shape anisotropy dominates microwave complex permeability, and the natural resonance plays main role in flake.     

掺La的Bi—2201相材料的拉曼散射研究

本利用激光拉曼光谱研究了Ｌａ替代Ｓｒ对Ｂｉ－２２０１相材料的微结构和氧含量的影响。实验表明，随着Ｌａ含量的增加，体系中额外氧增加，晶体的结构畸变加剧，晶格的无序程度增大，本利用调制的晶格失配模型对这种由Ｌａ替代Ｓｒ所造成的结构畸变行为进行了讨论。     

溶胀动力学法测定高聚物溶度参数

用溶胀性能测定仪，以溶胀动力学方法成功地测定了线型及交联高聚物的溶度参数，此方法较传统的特性粘数极大值法及平衡溶胀度方便、省时、省力、易于推广。     

曲线的一种复变量方程

在广义极座标下,对方程(2)中r的正负不做限制,而式(1)中的r表示复数的模,取非负值。事实上,当r(θ)<0时,若仍遵守(1)中对r的限制,将(r(θ),θ)代之以(-r(θ),θ+π),表示成复数为     

影响弱碱树脂交换容量的几个因素

本文探讨了以二甲胺为胺化剂，苯乙烯系弱碱阴树脂生产过程中，氯球的洗涤方式、膨胀剂的种类、胺化方法、温度等因素对树脂全交换容量及强碱基团交换容量的影响     

在代数中应重视进行形象化教学

在近代科学史上曾发生过一件有趣的事:十九世纪的一次国际性会议,来自世界各国的许多著名数学家进早餐.法国数学家柳卡突然向在场的人们提出一个被他称为“最困难”的题目:     

例题教学的若干原则刍议

例题是教材的重要组成部分,例题教学则是学生获得数学知识,掌握解题技能技巧,理解所涉及的数学思想方法的主要渠道。因此,没有一位数学教师会忽视例题的教学。但如何充分发挥教材中例题的功能与作用,例题教学应遵循什么样的原则?这里,我们就针对当前初中数学教学实际,从六个方面提出例题教学应遵循的一些原则。一、例题教学要有明确的目的性教材中每一道例题都比较具体地反映了数学的有关内容及学生应掌握的程度,但各个例题的目的和作