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.     

复杂反应机理简化方法

本文阐述了复杂反应机理与反应动力学方程之间的关系，指出简化复杂反应机理的必要性，建立了简化复杂反应机理的代数方法，并以乙烷裂解反应作为例子给与说明。     

变腔深双层微穿孔板消声器的研究

本文对变腔深双层微穿孔板消声器进行了研究,提出了一种新的设计方法:即根据吸声系数最大原理选定双层微穿孔板消声器的腔深值。这种方法拓宽了消声器的消声频带宽度,改善了消声器的消声性能。这种设计方法已经实践检验,取得了良好的效果,从而证明这种方法是可行的。同时,本文还对双层傲穿孔板消声器的失效频率进行了讨论。     

一类特殊形式的组合机构

本文通过对卷烟切丝机刀片补偿机构的分析，导出了一类特殊形式的组合机构，并对这类组合机构的构成方法及重要特性进行了分析和论证。     

特殊测井数据库管理

近年,各油田建立了测井数据库,但特殊测井数据还是以“图片”的形式保存,这对特殊测井数据的继续使用带来很多不便。在分析了特殊测井数据基础之上,本文介绍一种新的测井数据库管理方法,将不同解释系统下形成的成果数据、图形文件等资料在Oracle数据库中有序存放与管理,解决了特殊测井大块数据在网络环境下的高效传送难题,极大地提高了特殊测井数据的再次利用效率,实现了特殊测井“数据型”图件的网上显示。     

一种通信网网控系统

作者研制了一种用于野战综合通信训练模拟系统中的网控系统,本文介绍了该系统的功能、结构、工作原理和软件控制流程,叙述了该系统实现的主要技术及其优点,最后对实际应用进行了一定的分析。     

变预处理子SOR-双共轭残量法

研究了大规模稀疏线性方程组的预条件迭代求解算法。结合Krylov子空间方法和SOR迭代,给出了一个新的求解算法,即变预处理子SOR-双共轭残量法,同时给出了算法的收敛性分析。数值实验显示了算法的快速收敛性。     

从一个极值总是到一类行列式的计算

在数学中及工程技术中,对有关极值问题的讨论是一个非常重要的课题,对于这些问题的讨论有时可化为一些等式或一些行列式的计算。对一类极值问题进行了认真讨论和分析,给出了一类行列式的计算,并推广了阶乘的概念,且得到一类正定矩阵     

不完备信息系统中一个变精度粗糙集模型

针对不完备信息系统的知识获取,提出了一种基于相容度的变精度粗糙集模型,该模型是变精度粗糙集模型在不完备信息系统中的拓展.定义了这种模型上的知识约简,并给出了求约简的一个启发式算法.最后通过实例分析说明了算法的有效性.     

机械加工过程的工艺链分析

本文利用工艺链原理，对CA10发动机铝活塞的机械加工工艺过程进行了整体研究；分析了活塞销孔中心线对裙部中心线垂直度质量指标在各。序中的控制情况；研究了各工序间的相互关系和影响，得出了相关结论。     

马尔科夫链的一个应用

本文给出了一个判别马尔科夫链具有普遍历性的充分条件，并给出了马尔科夫链的一个新的应用，即利用马尔科夫键来定量地评价教师的教学效果，这种评价方法具有比目前各种评价方法更为科学合理的特点。