Cellular automata modeling of pedestrian＇s crossing dynamics

Cellular automata modeling techniques and the characteristics of mixed traffic flow were used to derive the 2-dimensional model presented here for simulation of pedestrian's crossing dynamics. A conception of "stop point" is introduced to deal with traffic obstacles and resolve conflicts among pedestrians or between pedestrians and the other vehicles on the crosswalk. The model can be easily extended, is very efficient for simulation of pedestrian's crossing dynamics, can be integrated into traffic simulation software, and has been proved feasible by simulation experiments.     

须条与长丝间距对Sirofil成纱结构性能的影响

分析了Sirofil纺纱过程中“V”形区的动态变化及粗纱须条与长丝间距大小对“V”形区形状和单纱受力的影响,认为间距增大会使“V”形区夹角增大、单纱段长度变长,并以此为依据,保持其他工艺参数不变,改变粗纱与长丝间距大小,试纺Sirofil纱,通过理论分析和实验比较讨论间距大小对Sirofil成纱结构性能的影响。结果表明：随着间距增大,成纱直径系数趋小、毛羽减少、强伸性与条干均呈非单调性变化;综合考虑成纱结构和性能,在其他参数相同时,Sirofil最佳成纱间距为12～16mm。     

新一代开放系统及互操作性研究

经历 2 0世纪 90年代的持续实践 ,采用“开放系统”的思想来集成大型的计算机系统已成为技术界不争的事实。然而 ,技术的发展使得传统的开放系统面临严峻的挑战 ,需要新的标准、技术来使开放系统体现高度的智能协作性及移动性。基于完善的开放系统的实际形成有赖于“互操作性”的实现这一原因 ,以互操作性为研究对象 ,以移动agent为研究工具 ,探讨了新一代开放系统实现机制以及未来发展的前景。     

教育产业投资中的心理博弈分析

教育是产业,是个人（或家庭）与国家为主要投资主体的产业,是增加社会效用和个人满足感的部门。对教育进行投资的过程就是人力资本和物力资本的积累过程。居民教育支出的主要功能,是实现未来收益的、积累”,而非“消费”。国家和个人或家庭确定自己的投资计划,定位自己的成本－－收益曲线的过程,实际上就是国家政府和个人通过党校进行博弈的过程。教育的边际效用是递增的,教育“产业化”不等于“市场化”。国家应加大对初、中等教育的投资力度,建立新型的政府与民间合作投资的“混合制度”,以促进教育产业的健康发展。     

Research on effects of hydrostatic pressure on the dielectric property of Pb(Zn<Subscript>1/3</Subscript>Nb<Subscript>2/3</Subscript>)O<Subscript>3−</Subscript>BaTiO<Subscript>3−</Subscript> PbTiO<Subscript>3</Subscript> relaxor ferroelectric ceramics

The dielectric properties of Pb(Zn1_1/3Nb_2/3)O₃₋ BaTiO₃₋PbTiO₃ relaxor ferroelectric ceramics near the rhombohedral and tetragonal phase boundary were investigated under hydrostatic pressure. It was found that hydrostatic pressure made their phase transition temperature T _c and the peak temperature T _m decreased, and the frequency dispersion and relaxor behavior enhanced. In these disorder systems of composite pervoskite structures, there appeared polar clusters or nanodomains. The unique physical characteristics, which made the relaxor behavior enhanced, is that the correlation length among these nanodomains decreases greatly with the pressure increasing.     

混合稀土对AB5贮氢合金织构生长特性影响的PLS研究

利用偏最小二乘法（PLS）研究混合稀土组成对贮氢合金的织构生长特性的综合影响,并提出了合金织构择优取向的判据。对于平行于柱状晶织构,择优取向（101） (201)晶面受Nd的影响最为敏感,Ce的影响最小,同时Ce对择优取向的作用与La,Pr,Nd的作用相反;对于垂直柱状晶织构,择优取向（200） (110)晶面受Pr的影响最为敏感,而受Nd的影响最小。     

基于对等网络的信任模型

在Client/Server网络架构得到普遍应用的格局中,对等网络却异军突起迅速发展。针对这种新兴架构提出了与传统架构不同的一种安全信任模型。它依据网络的推荐值建立节点间的信任关系,更好地保证网络的安全性和避免恶意攻击。给出了求解信任值的数学模型和具体算法,并对信任模型的安全性能进行了理论评测。     

履带式推土机粘弹性悬挂机构的开发研究

对履带式推土机行走机构的振动特性进行测试 ,建立起推土机缓冲系统模型 ,经对模型特性参数对传递率影响的分析 ,确定出参数的合理值域。把阻尼材料诺模图曲线数字化 ,做到了计算机对诺模图动态曲线的自动查询 ,实现了阻尼缓冲结构的动态优化。掌握了阻尼缓冲结构的设计理论和方法 ,已应用于 2 4 2kW履带式推土机粘弹性悬挂机构的开发。     

Non-Fermi-liquid behaviour in La4Ru6O19

Understanding the complexities of electronic and magnetic ground states in solids is one of the main goals of solid-state physics. Transition-metal oxides have proved to be particularly fruitful in this regard, especially for those materials with the perovskite structure, where the special characteristics of transition-metal-oxygen orbital hybridization determine their properties. Ruthenates have recently emerged as an important family of perovskites because of the unexpected evolution from high-temperature ferromagnetism in SrRuO3 to low-temperature superconductivity in Sr2RuO4 (refs 1, 2). Here we show that a ruthenate in a different structural family, La4Ru6O19, displays a number of highly unusual properties, most notably non-Fermi-liquid behaviour. The properties of La4Ru6O19 have no analogy among the thousands of previously characterized transition-metal oxides. Instead, they resemble those of CeCu6-xAux-a widely studied f-electron-based heavy fermion intermetallic compound that is often considered as providing the best example of non-Fermi-liquid behaviour. In the ruthenate, non-Fermi-liquid behaviour appears to arise from just the right balance between the interactions of localized electronic states derived from Ru-Ru bonding and delocalized states derived from Ru-O hybridization.     

"钦天监教案"起因探析

"钦天监教案"是清初多种矛盾激化的必然产物一、中西历法之争最后演化为"夷夏之辨"的政治斗争,给辅政大臣铲除政敌提供了借口;二、天主教势力的迅猛发展威胁到佛教的传统地位,使两教矛盾激化;三、汤若望在政治上的巨大成功损害了一部分满清权贵的政治利益;四、传教士内部的内讧给反汤若望势力可乘之机;五、汤若望成为辅政大臣清算"汉化"思潮的牺牲品.