一种基于通行需求度的单交叉口模糊控制算法

针对城市交通拥挤问题，提出一种根据通行需求度确定通行相位和通行时间的、可变相序的单交叉口模糊控制算法。仿真结果表明，在不同交叉口结构形式、不同相位构成和不同车流量组合的各种情况下，该方法均表现出良好的控制效果，是解决城市交通拥挤问题的有效途径。     

热工设备的模糊设计方法

该文运用模糊数学理论分析热工设备设计的不确定性问题，讨论模糊设计方法的应用，以热管式空气预热器为例进行模糊设计计算。     

物理实验课学生成绩量化考核的探索

探讨物理实验量化考核的方法及其科学性，运用计算机管理考核成绩，提高管理效率及其准确性。     

静态自蔓延法制备内衬陶瓷喷嘴的研究

基于静态自蔓延过程，采用A1一Fe2O3—CrO3燃烧体系，制备出变口径的内衬陶瓷层不锈钢喷嘴，其反应过程工艺稳定，内衬陶瓷层厚度均匀、致密、性能可靠。通过试验研究了影响工艺性能的因素，探讨了Al—Fe2O3—CrO3燃烧体系的燃烧机理，试验结果证实自蔓延反应是不平衡的过程，氧化—还原反应进行不彻底，陶瓷层的成分比较复杂。研究表明，与添加传统的SiO2、CaF2相比，采用一种新型的添加剂配方可显著提高陶瓷层的力学性能，改善其表面质量。     

谈校园体育文化中的德育教育功能

高校校园体育文化是校园文化的重要组成部分 ,是学校德育教育的重要内容和手段 ,校园体育文化中的德育教育是以间接的、内隐的方式呈现 ,具有隐蔽性、多样性、学生易接受性和主动性 ,是其它教育形式难以替代的。研究校园体育文化 ,有助实现学校体育教育目标和实现学校教育的总目标     

利用声誉信息的机会主义行为对合作的影响

基于声誉的间接回报是合作演化的一类重要机制,其中的个体对声誉好的个体倾向合作,但自利个体利用声誉信息的机会主义是对合作的威胁。本文建立了演化博弈模型,群体中包含回报型个体和投机型个体。对一个简化模型的分析表明,当一代中交互次数较少时,投机型个体能够入侵回报型群体。对复杂情景的计算机仿真结果表明:当采用声誉对称计算方式时,群体合作水平较低;当采用声誉非对称计算方式时,群体合作水平显著提高。说明声誉非对称计算方式能够抑制机会主义促进合作。     

Silicon in the Earth's core

Small isotopic differences between the silicate minerals in planets may have developed as a result of processes associated with core formation, or from evaporative losses during accretion as the planets were built up. Basalts from the Earth and the Moon do indeed appear to have iron isotopic compositions that are slightly heavy relative to those from Mars, Vesta and primitive undifferentiated meteorites (chondrites). Explanations for these differences have included evaporation during the 'giant impact' that created the Moon (when a Mars-sized body collided with the young Earth). However, lithium and magnesium, lighter elements with comparable volatility, reveal no such differences, rendering evaporation unlikely as an explanation. Here we show that the silicon isotopic compositions of basaltic rocks from the Earth and the Moon are also distinctly heavy. A likely cause is that silicon is one of the light elements in the Earth's core. We show that both the direction and magnitude of the silicon isotopic effect are in accord with current theory based on the stiffness of bonding in metal and silicate. The similar isotopic composition of the bulk silicate Earth and the Moon is consistent with the recent proposal that there was large-scale isotopic equilibration during the giant impact. We conclude that Si was already incorporated as a light element in the Earth's core before the Moon formed.