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.     

织物结构对其干热传递性能的影响

本文在分析了织物传热机理的基础上,探讨了有关组织结构的参数对织物传热的影响以及能反映这些参数影响作用的综合评价指标.并以七种涤纶织物为试样,进行有关结构参数和传热性能的测试与分析,为建立织物结构与传热极能的关系进行了初步的工作.     

热处理工艺对轧管机顶头组织的影响

研究了热处理工艺和化学成分对轧管机顶头组织的影响，从而得出最佳热处理工艺和最佳化学成分，为今后提高顶头的使用寿命提供了依据。     

一般情况下比热流参数的Monte-Carlo方法计算

文献(1)建立了处理辐射换热的一个新热流法的数学模型,并指出该模型与其它模型的本质区别表现在比热流参数上,全面准确地处理比热流参数是新热流法能较好地应用于实际工程问题的关键。本文给出一般情况下用Monte-Carlo方法求解比热参数的数学模型。作为例子,本文还给出了一个具体情况下的计算结果,它与文献(1)的预见相符。     

相关辐射投射热流拟投影张量的近似代数求法

给出了正，负向相关辐射投射热流拟投影张量的近似代数求法，为实现文献「１」所提出的辐射传热数学模型求解高温状态下的辐射换热量奠定了基础。     

纸机干燥部控制系统流程设计分析

分析了在纸机干燥过程中用热泵取代常规的节流减压元件的优点，介绍了纸机烘干部热泵流程开、闭环的基本原理及基本应用实例。     

按热计费是供热收费的发展趋势

分析了目前实行的采暖按面积收费的各种弊端．认为按热计费势在必行,阐述了推行按热计费急需解决的几个问题。     

列管换热器列管间距的改进设计

本文提出对列管换热器列管间距经典计算公式的修正计算式。在实际应用中解决了列管式换热器在浸出油厂中使用易结垢和易被粕末堵塞壳程中通道等问题,并且强化了传热。     

热网管道保温技术与优化设计

本文对化工热力管道的保温技术与优化设计进行了技术阐述与研究。并针对某大型化工企业的热力管道的测试与优化设计提供了该节能技术的程序。     

服装的温度调节功能

服装对热传递的影响与织物的传热性质有关但不等同，它涉及到人体、环境及服装自身的一系列其它因素。本文系统分析了服装对人体和环境之间各种传热方式的影响机理，分析了服装隔热指标—克罗值的物理意义，找出了调温功能的相关因素并对其影响情况作了讨论。     

热泵节能系统在软胶丸干燥工艺中的应用

提出了将热泵系统应用于软胶丸干燥过程的新型工艺流程,并对该热泵系统进行了优化设计计算。以此为依据所建造的ＴＸＬ型软胶丸干燥机的实际运行结果表明,该新型干燥机彻底解决了原干燥工艺存在的种种问题,所设计的热泵系统具有显著的节能效果,其能耗仅为原干燥工艺能耗的１／９。