Complete Gluonic Phase in Two-Flavour Colour Superconductivity

We study a typical complete gluonic phase （LGP） in two-flavour colour superconductivity （2SC） by calculating the essential cubic and quartic interfering term between the gluonic condensates （Az^（8）） and/Az^（6）） with a gauged NJL model. It is proven that the coefficients of the cubic interfering term and the vacuum contributions of the cubic and quartic interfering term are all equal to zeroes. The coefficients of the quartic interfering term and the /Az^（6）） ＇s quartic self-interaction term at stationary points of Larkin-Ovchinnikov-Fulde-Ferrell （LOFF） phase are calculated. Comparisons among the effective potentials of LOP, g2SC and LOFF phase indicate that LOP could be the genuine ground state of 2SC for some reasonable paxameters.     

带电体一定吸引轻小物体吗

在讲授静电场时,教师经常从带电体吸引轻小物体引入新课.有心的学生往往会问:带电体为什么会吸引轻小物体?带电体一定会吸引轻小物体吗?就此问题笔者做以下讨论,供参考.     

多模态建构下的无机化学课程学习体验与感受

陕西师范大学化学化工学院无机化学课程组根据课程内容和学生学习特点,有针对性地设计并采取了不同的授课方式,构建了多模态教学方式,尝试了创新型课堂,以调动学生的学习积极性,培养学生的自主学习能力。本文从学生的角度出发,依据无机化学课程学习情况,对不同的教学方式下的学习感受进行了总结,剖析了学生在多模态建构下的无机化学课程中的学习体验与感受,以期在教学改革的探索中实现师生共学相长,共同提升教学质量,打造适合提升学生综合能力的“入门课程”。     

A level set method for structural topology optimization with multi-constraints and multi-materials

Combining the vector level set model, the shape sensitivity analysis theory with the gradient projection technique, a level set method for topology optimization with multi-constraints and multi-materials is presented in this paper. The method implicitly describes structural material interfaces by the vector level set and achieves the optimal shape and topology through the continuous evolution of the material interfaces in the structure. In order to increase computational efficiency for a fast convergence, an appropriate nonlinear speed mapping is established in the tangential space of the active constraints. Meanwhile, in order to overcome the numerical instability of general topology optimization problems, the regularization with the mean curvature flow is utilized to maintain the interface smoothness during the optimization process. The numerical examples demonstrate that the approach possesses a good flexibility in handling topological changes and gives an interface representation in a high fidelity, compared with other methods based on explicit boundary variations in the literature. The project supported by the National Natural Science Foundation of China (59805001, 10332010) and Key Science and Technology Research Project of Ministry of Education of China (No.104060)     

多维不可微平稳正态过程的极值

讨论了强相关多维不可微平稳正态过程的渐进性质 ,给出了其最大值的极限分布     

与函数周期性有关的两类问题

函数的图象与性质是高中数学的重点内容,也是函数知识与解析几何知识的交汇点,2001年全国高考数学压卷题就是涉及函数奇偶性、对称性、周期性、数列、数列极限等的综合题,本文就与函数周期性有关的两类问题作一些探讨.     

97MeV 16O轰击51V靶出射α粒子的测量与理论分析

用不同种类的粒子望远镜测量了97MeV ¹⁶O+⁵¹V反应中出射的α粒子.得到了单举α粒子能谱、角分布、E-θ平面内的d²σ/dEdΩ截面等高图及速度平面内的d²σ/PCdEdΩ截面等高图.区分了复合核蒸发的α粒子与直接机制发射的α粒子.用激子模型对预平衡发射的α粒子贡献进行估计,得到的预平衡发射和复合核蒸发分别在α粒子总产额中所占的比份.     

97MeV 16O+51V反应中α粒子与类弹产物的关联测量

测量了α粒子与类弹产物的关联,得到的α粒子符合能谱呈现出类弹、类靶相继发射的特征;α粒子与类弹产物¹²C的关联表明了弹核破裂(break-up)机制的存在.在类弹产物探测方向附近,观察到核的阴影效应.     

关于交换解析函数的算子根

设T为协控制算子,S为局部非零交换解析函数的算子根,X为拟仿射,使SX=XT(或SXT=X)则T为正常算子且S与T半相似(S与T~(-1)半相似)。