Intact soft clay’s critical response to dynamic stress paths on different combinations of principal stress orientation

Comprehensive tests on Hangzhou intact soft clay were performed, which were used to obtain the soils’ critical response to undrained dynamic stress paths under different combinations of principal stress orientation. The different combinations included cyclic principal stress rotation (CPSR for short), cyclic shear with abrupt change of principal stress orientation (CAPSO for short) and cyclic shear with fixed principal stress orientation (CFPSO for short). On one side, under all these stress paths, samples have obvious strain inflection points and shear bands, and the excess pore water pressure is far from the level of initial effective confining pressure at failure. Stress paths of major principal stress orientation (α) alternating from negative and positive have quite different influence on soil’s properties with those in which α is kept negative or positive. On the other side, due to the soil’s strongly initial anisotropy, samples under double-amplitudes CPSR and CAPSO (or single-amplitude CPSR and CFPSO) have similar properties on dynamic shear strength and pore water pressure development tendency when α is kept within ±45°, while have quite different properties when α oversteps ±45°.     

解读连战先生的民族情

文章试图从两方面解读连战先生深厚的民族情.这种民族情一方面来源于他的家族,连战的先祖到台湾死也不臣服清,曾祖父至父亲三代以各种形式坚持抗日及父母对他言传身教;另一方面与他早年在祖国大陆的生活经历有关,从他对抗战和日本的态度及祖国大陆寻踪等方面体现出来.     

Evaluation of ultimate bearing capacity of Y-shaped vibro-pile

Based on Mindlin stress solution, a numerical computational method was proposed to calculate the stresses in the ground induced by side friction and the resistance of Y-shaped vibro-pile. The improved Terzaghi’s and ЪерезанцевВГ’s methods for ultimate bearing capacity evaluation were proposed by considering the stress strength induced by friction resistance at pile head level of Y-pile. A new method to calculate the ultimate bearing capacity of Y-pile was also proposed based on the assumptions of soil failure mode at the tip of Y-pile and the use of Mohr-Coulomb soil yield criterion and Vesic compressive correction coefficient with the induced stresses in the ground. Based on the comparisons with the field static load test results, it is found that the improved Terzaghi’s method gives higher ultimate capacity, while the other two methods shows good agreement with the field results.     

Adhesion coefficient of automobile tire and road surface

The adhesion coefficient of automobile tire and road surface was analyzed and the formula about it was derived.Some suggestions about highway construction,driving safety of the drivers and the judgment of the traffic accidents were presented.The results show that the adhesion coefficient is a function with the extreme value.If there is atmospheric pressure in the tire,the load of the vehicle and the degree of the coarse on the road surface is not selected properly,it will reach the least and affect the safety of the running automobile.     

Effects of stress conditions on rheological properties of granular soil in large triaxial rheology laboratory tests

In order to study the rheological properties of red stone granular soil,a series of rheological experiments were executed on large tri-axial rheological apparatus.Under 100,200 and 300 kPa confining stress conditions,the rheological tests were carried out.These experiment results showed that the stress conditions,especially the stress level were the critical influencing factors of the rheological deformation properties.Under the low stress level(S=0.1),the granular soil showed the elastic properties,and there was no obvious rheological deformation.Under the middle stress level(0.20.8) creep curves showed the non-linear viscous plastic rheological properties.Especially,under the stress level of S=1.0,the accelerated rheological phase of creep curves occurred at early time with a trend of failure.The stress level had obvious effects on the final rheological deformation of the soil sample,and the final rheological deformation increments nonlinearly increased with stress level.The final rheological deformation increment and step was little under low stress level,while it became large under high stress level,which showed the nonlinearly rheological properties of the granular soil.The confining pressure also had direct effects on final rheological deformation,and the final rheological deformation linearly increased with confining pressure increments.     

2008年我国房地产业的发展模式与市场把握

在深入市场调查、认真采集数据和科学分析研究的基础上,从我国新一年房地产业发展的"背景和环境"、"预期和责任"、"风险和影响"、"保障和创新"等方面进行阐述和论证.     

窃取商业秘密获得的专利权归商业秘密权利人所有——兼谈商业秘密构成要件和范围

中国加入WTO以后,知识产权的保护意识日益强化,作为知识产权范畴的专利权更是被人们普遍关注和重视.以"错案"为研究对象,运用商业秘密的有关理论以及保护商业秘密和专利权的有关法律制度,特别是从窃取商业秘密获得的专利权归谁所有的角度,对人民法院的判决进行了分析研究,指出了人民法院的判决是错误的,提出了窃取商业秘密获得的专利权归商业秘密权利人所有.这有利于人民法院公正司法,依法审判.     

从语气助词的角度浅析日语表达方式的特性

日语中有着十分丰富的语气助词,其虽然不具有实际的意义,然而通过语气助词,却能够流露出说话者的心情和感受,传递出不溢于言表的隐性含义,在日常的表达中扮演着十分重要的角色.从语气助词的角度,分析总结日语在表达上所具有的特性.     

Additional water use influencing strength and fluidity of recycled concrete

Through adding different additional water use,the compressive strength,splitting tensile strength and fluidity of recycled concrete of three aggregate combination forms were studied by experiment respectively.The experimental results show that with the increase of adding additional water use,the compressive strength and splitting tensile strength of recycled coarse aggregate concrete decrease,but that of recycled fine aggregate concrete and recycled all aggregate concrete increase firstly then decrease.When additional water use is added more 15% or 20% than that of basic ordinary concrete,the recycled coarse aggregate concrete and fine one can get pretty good fluidity.When it is added more 30%,the recycled all aggregate concrete has fluidity that is just satisfied.     

情趣与意象的契合——《逢雪宿芙蓉山主人》与《雪夜林边驻脚》之比较

通过分析《逢雪宿芙蓉山主人》与《雪夜林边驻脚》两诗的情趣和意象,发现两诗都采用了大致相似的意象.但由于诗人各自的文化传统的差异,在两诗中所传达的情趣却不同.然而,正是由于两诗各自在情趣与意象上的契合,才创造出了各自完美的诗境.     

智能电能表静电放电抗扰度试验研究

分析了静电放电产生的原理及其危害,通过对各级标准和静电放电抗扰度试验的研究,针对如何测试智能电能表抗静电放电干扰能力,提出首先进行静电放电发生器符合度验证试验,并通过实践摸索了一套智能电能表静电放电抗扰度试验方法,从而保证智能电能表的工艺设计符合抗静电放电干扰的需要．     

纤维制品的抗静电技术及其应用

阐述了纤维制品的静电检测方法,在纺纱纺丝、后整理阶段采用的各种抗静电技术,抗静电纤维、导电性纤维的种类和加工方法,各种抗静电纤维、导电性纤维的抗静电性能和用途,利用导电性纤维制得的纺织品的抗静电性能。     

静电电磁脉冲及其理论建模研究

分析了静电放电的电路模型和静电放电辐射场模型,指出了当前各种理论模型的问题和适用范围,提出了适合计算静电电磁场的"改进偶极子模型".在研究静电放电辐射场对电子设备形成干扰的基础上,进行了数值计算与仿真,计算结果表明,在静电起电与放电同时发生的过程中,起电率的大小对形成静电干扰有重要影响.为此,建议有关静电理论建模与危害防护研究应考虑静电起电-放电的全过程.     

矿粒在振动式摩擦电选机中运动轨迹的研究与分析

振动式摩擦电选是一种比较重要的物理选矿方法．高压静电分选腔是电选机的重要组成部分,对矿物及物料的分选起着决定性的作用．本文介绍了振动式摩擦电选机及其高压静电分选腔的工作原理,并对进入振动式摩擦电选机高压静电分选腔中的荷电矿粒的受力情况、运动轨迹以及影响荷电矿粒在其分选腔中运动轨迹的因素进行了分析和研究．     

弹药仓库检修作业平台的静电安全监测电路设计

以某弹药仓库为研究对象,针对弹药仓库检修车间潜存的静电隐患,分析了弹药仓库检修作业工作平台的静电特性,设计了针对检修作业平台静电电位的监测电路,给出了静电电位监测电路中各主要元器件的技术要求,实现了对弹药仓库检修作业平台的静电电位监测报警的目的.     

原油脱水用管式静电聚结技术研究概况

传统的原油脱水设备因占地面积大、效率低,难以满足海洋石油、陆上高含水油田和绿色油田开发的需要。国外围绕高效紧凑原油电脱水技术进行了长期研究,其中以管式静电聚结技术的发展最为引人注目。介绍了国外第一代管式静电聚结产品电脉冲感应聚结器EPIC、紧凑型静电聚结器CEC、在线静电聚结器IEC和新一代在线静电聚结器IEC、H型紧凑静电聚结分离器CES的结构、工作原理和应用研发情况,总结对比了两代管式静电聚结器的特点和发展规律,提出了研究管式静电聚结技术的方向和思路。     

几种静电消除器消电性能的研究

研究自感应式和交流高压式静电消除器的消电性能,对影响其消电电流的条件进行了测试和分析,并且研究出一种消电性和安全性都较好的针——针型放电极的交流高压式消电器.     

二维开域静电场的ANSYS解法

为了提高ANSYS求解二维无界静电场的精确度,提出映射法.它是采用复指数函数,将无穷远边界线映射成一点,从而将一条边界线敞开的矩形边界的二维无界静电场,映射到其对应的二维有界静电场,再应用ANSYS求解.由于有界场的边值问题与无界场的边值问题相同,故有界场中某点的ANSYS解就是无界场中对应点的解.理论和计算的结果表明:映射法显著地提高了ANSYS求解二维无界静电场的精确度,并加快了计算速度.     

安防系统静电干扰的研究

在电磁兼容测试中,许多受试设备难以通过静电干扰抗扰度测试,不能正常使用。该文重点阐述了安防系统产生静电干扰的起因以及带来的危害,并进行了静电放电试验,针对静电放电的干扰和防护机理,分别从电源和系统前端进行了抗静电干扰改进,大大减轻了静电干扰的影响。     

用于空气净化的电吸尘器理论分析及设计

论述了电吸尘器用于工业除尘与室内空气净化时的异同性，对电吸尘器的吸尘效率、有效驱进速度等重要参数进行了分析，并对室内用空气净化器的电场及其参数进行了设计。