巧导玻耳兹曼方程

玻耳兹曼方程给熵函数以明确的统计意义,它指出,某个宏观状态的熵等于玻耳兹曼常量κ乘以相应微观状态数的对数。它把宏观物理量与微观性质有机地联系起来了。探究其导出过程,对于更深层次地理解玻耳兹曼方程具有十分重要的意义。     

大学物理教学中存在的问题及其对策

文章分别从教学内容、教学方法、教学条件、教师素质、学生学习观念等方面出发,分析了大学物理教学中存在的问题,并对其进行了比较和讨论。在此基础上,为达到完善大学物理教学目标提出了几点对策和措施,以适应现代社会知识迅速发展的新要求。     

The 2.8 Å crystal structure of the dynein motor domain

Dyneins are microtubule-based AAA(+) motor complexes that power ciliary beating, cell division, cell migration and intracellular transport. Here we report the most complete structure obtained so far, to our knowledge, of the 380-kDa motor domain of Dictyostelium discoideum cytoplasmic dynein at 2.8?? resolution; the data are reliable enough to discuss the structure and mechanism at the level of individual amino acid residues. Features that can be clearly visualized at this resolution include the coordination of ADP in each of four distinct nucleotide-binding sites in the ring-shaped AAA(+) ATPase unit, a newly identified interaction interface between the ring and mechanical linker, and junctional structures between the ring and microtubule-binding stalk, all of which should be critical for the mechanism of dynein motility. We also identify a long-range allosteric communication pathway between the primary ATPase and the microtubule-binding sites. Our work provides a framework for understanding the mechanism of dynein-based motility.     

Project Scheduling Using Hybrid Genetic Algorithm with Fuzzy Logic Controller in SCM Environment

In supply chain management (SCM) environment, we consider a resource-constrained project scheduling problem (rcPSP) model as one of advanced scheduling problems considered by a constraint programming technique. We develop a hybrid genetic algorithm (hGA) with a fuzzy logic controller (FLC) to solve the rcPSP which is the well known NP-hard problem. This new approach is based on the design of genetic operators with FLC through initializing the serial method which is superior for a large rcPSP scale. For solving these rcPSP problems, we first demonstrate that our hGA with FLC (flc-hGA) yields better results than several heuristic procedures presented in the literature. We have revealed a fact that flc-hGA has the evolutionary behaviors of average fitness better than hGA without FLC.     

一模多腔热流道注射模成型PET瓶坯

对于注射成型加工温度范围较窄的ＰＥＴ塑料，采用一模四腔热流道注射模成型ＰＥＴ饮料瓶坯，取得了良好的生产效果．     

ZA27合金锻造及挤压成形实验分析

ＺＡ２７合金可以锻造和挤压成形，但挤压成形态塑性偏低，通过热处理可有效地提高挤压合金的综合力学性能。     

凿岩机异形内齿套筒的冷挤压成形

对凿岩机异形内齿套筒的冷挤压整体成形进行了试验研究。结果表明：用径向挤压代替反挤压内齿,能降低挤压力、利于提高模具使用寿命、产品质量,能满足设计要求。     

如何搞好文科大学物理选修课的教学

文科大学物理是高校实施文化素质教育的一门重要课程,教学实践证明,开设文科大学物理选修课具有十分重要的意义,本文结合教学的实际情况对如何构建文科大学物理课程体系、如何搞好文科大学物理选修课的教学做了一些初步探讨。     

高职高专应用电子专业学生通识教育的途径研究

在科技和经济快速发展的今天,传统职业的劳动性质和职业内涵已经发生了根本性的变化。因此,对应用电子专业学生的教育必须要处理好"通识教育"与"专业教育"之间的关系,以科学发展观为指导,积极探索一条通专结合的培养路径。加强通识教育,促进高等职业教育健康发展,是高职院校刻不客缓的义务和责任,与终身学习和职业流动的现代化潮流是相适应的。