数值模拟离子强度敏感水凝胶的多场特性

发展了多物理模型来研究溶液中离子强度敏感水凝胶电-力-化学多场耦合的特性. 模 型的主要控制方程包括：计算水凝胶内外离子浓度分布的Nernst-Planck化学场方程；描述 膨胀变形的力学场方程和描述电场的泊松方程. 无网格有限云团法和牛顿迭代法用来数值离 散和求解控制方程. 通过对比多场耦合的响应, 包括胶的膨胀率和胶内外离子浓度和电势的分布，探讨了影响胶体变形的主要因素. 对数值模拟结果和实验结果进行了对照.     

基于HTML5 Canvas的跨平台物理模型构建

本文对物理模型在物理教学中的作用进行了分析,并介绍了HTML5以及Canvas画布技术,阐述了如何基于HTML5 Canvas画布设计构建跨平台的多弹簧振动模型.     

浅谈新课程下高中物理模型教学的障碍及突破

高中物理模型教学是新课程改革的需要，它既能够使学生构建物理基础知识，也能够在建立和应用物理模型的过程中培养学生的科学素养和思维品质。对当前高中物理模型教学的现状进行分析后发现物理模型教学中存在着一些障碍，对这些障碍进行有效的突破，是提高学生学习效率、保证整体教学质量的关键。     

例析高中物理模型教学的重要性

物理模型是高中物理教与学的一个主线,建模的思想是一种科学的思维的体现,包含了对自然界中的某一类相近现象抽象化的描述和概括,就起作用而言,建模在整个高中物理知识的学习过程中是不可或缺的重要思想,本文就就结合笔者的教学实例,谈谈物理模型教学的重要性,望能有助于教学实践.     

Modeling liquefaction of water saturated granular material under undrained cyclic shearing

The tendency of particles in a water-saturated granular mass to re-arrange into a denser state during cyclic shearing under pressure results in an increase in pore water pressure. The increase in the pore water pressure causes a reduction in the inner particle contact forces, and in turn easier re-arrangement of the particles. Eventually, the material loses its shear strength, partially or almost completely. In this paper, a general three-dimensional continuum mechanics model is presented for the deformation of granular materials. A physically based model is also presented for characterization of liquefaction of the water saturated granular material under undrained cyclic shearing. The model incorporates the fabric of the granular mass, which develops as the frictional granular mass is deformed in shear. It includes the coupling between shearing and excess pore water pressure. The model parameters are estimated, based on the results of cyclic shearing experiments on large hollow cylindrical samples of silica sand. Basically, the calculation results utilizing this model can embody liquefaction phenomena of the water saturated granular material under undrained cyclic shearing.     

浅谈物理模型的构建及应用模型解题

近几年物理高考题中,部分考试题型的物理情景设计是源于生产生活实际素材,源于实验所取得数据。学生遇到这类题型,往往不知道如何着手。本文针对这个问题阐述了物理模型建构的意义,归纳了建模方法以及物理模型建构与应用,对学生学习物理、培养兴趣具有一定的意义。     

物理建模能力培养的实践探索

: 以剑桥大学一道弹性碰撞测试题为例, 分析、 讨论了在大学物理教学中如何培养学生的物理建模能力 等问题.     

一种考虑IGBT基区载流子注入条件的物理模型

提出了一种考虑绝缘栅极双极晶体管(insulated gate bipolar transistor,IGBT) 基区载流子不同注入条件的物理模型. 在小注入和大注入情况下,分别建立描述IGBT基区载流子运动的输运方程(ambipolar transport equation,ATE),并确定边界条件. 采用傅里叶级数法求解载流子输运方程,并将计算结果分别与IGBT手册提供的实验数据和Hefner模型计算结果相比较,验证了本文提出物理模型的正确性. 关键词： 绝缘栅极双极晶体管 物理模型 注入条件 双极输运方程     

Study on induced radioactivity of China Spallation Neutron Source

China Spallation Neutron Source (CSNS) is the first High Energy Intense Proton Accelerator planned to be constructed in China during the State Eleventh Five-Year Plan period, whose induced radioactivity is very important for occupational disease hazard assessment and environmental impact assessment. Adopting the FLUKA code, the authors have constructed a cylinder-tunnel geometric model and a line-source sampling physical model, deduced proper formulas to calculate air activation, and analyzed various issues with regard to the activation of different tunnel parts. The results show that the environmental impact resulting from induced activation is negligible, whereas the residual radiation in the tunnels has a great influence on maintenance personnel, so strict measures should be adopted.     

上海世博会气象馆平均风压数值模拟研究

采用数值模拟方法对上海世博会气象馆进行了平均风压数值模拟,比较了4种较适合于结构风工程的RNG k-ε,SST-k-ω,SSG-RSM和BSL-RSM湍流物理模型,包括体型系数、表面合力、合力矩及湍动能结果,同时结合风流动特性分析了其规律性和差别的原因,并得到SST-k-ω,BSL-RSM与SSG-RSM模型各有优势,而RNG k-ε模型稍差的结论.最后研究了有无干扰情况下的场馆表面平均风压系数,分析了风干扰的原因.