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.     

用电势滴定法测定锰含量

本文研究了用电势滴定法直接测定菱锰矿、软锰矿中全锰量以及电解液中Mn~(2+)浓反,该法可连续滴定和自动滴定,适用于工业生产的中间过程控制,具有操作简便、快速等优点。     

电位滴定法在环境监测中的应用

本文简要介绍了运用电位滴定法对水中Ca2 ，Mg2 ，Cl-及F-离子进行测定，利用化学计量点时电位的突跃来确定终点．方法简便、快速、灵敏、准确，符合定量分析要求，可用于环境监测之中．     

分布系数与滴定可行性界限

以分布系数为基础，推导出酸碱准确滴定的界限，与其它方法导出的结果相一致。     

交流示波极谱滴定法测定盐酸环丙沙星

在ｐＨ４８的ＨＡｃ－ＮａＡｃ溶液中,加入过量的Ｎａ－ＴＰＢ与环丙沙星作用生成沉淀,过滤后用四乙基铵溶液滴定滤液中过量的ＴＰＢ,由交流示波极谱图上ＴＰＢ的切口消失指示终点。本法操作简便,终点直观、敏锐,已用于盐酸环丙沙星片剂的测定。     

电化学分析在环境监测中的应用研究(Ⅰ)示波极谱——Oxine滴定法测定工业废水中S~(2-)含量

研究了在 HAc-Na Ac-KCl介质 (p H=5 .5 )中用 Cu2 离子沉淀 S2 -离子 ,过量的 Cu2 离子用标准 8-羟基喹啉溶液返滴 ,并以 8-羟基喹啉在微铂电极交流示波极谱图上出现的敏锐切口指示滴定终点。废水的色度和浊度均不影响测定 ,试样勿需预蒸馏、分离吸收等繁杂的操作手续 ,方法简便、快速、准确 ,标准偏差小于 0 .0 5 0 ,变异系数小于0 .60 % ,回收率为 98～ 1 0 2 %。     

分别滴定条件的探讨

利用副反应系数和反应完成程度的概念讨论了酸碱滴定、沉淀滴定、氧化还原滴定的分别滴定条件,得到了与现有结论相一致的结果,说明了四大滴定是相关、统一的整体     

滴定分析的可行性探讨

提出以滴定曲线方程导出酸碱滴定、络合滴定、氧化还原滴定、沉淀滴定的可行性界限，说明可行性界限是有条件、变化的。并对文献中叙述滴定可行条件不一致的原因作出讨论。     

滴定实验过程的计算机图形动态模拟及CAI

本文描述了利用Borlandec 语言的图形工具开发出了滴定实验过程的计算机图形动态模拟及CAI系统，该系统以直观，动态，彩色和具有立体感的动画方式在计算机屏幕上模拟了滴定实验过程，即酸碱滴定，氧化还原滴定及络合滴定．该软件的结构化程度高，可移植性好，扩充性强，采用用户界面良好的下拉式菜单驱动各实验模块的实现．     

电化学分析在环境监测中的应用研究（Ⅰ）示波极谱—Oxine滴定法测定工业废水中S^2—含量

研究了在HAc-NaAc-KCl介质（pH=5.5)中用Cu^2 离子沉淀Ｓ^2-离子,过量的Ｃu^2 离子用标准８－羟基喹啉溶液返滴,并以８－羟基喹啉在微铂电极交流示波极谱图上出现的敏锐切口指示滴定终点,废水的色度和浊度均不影响测定,试样勿需预蒸馏、分离吸收等繁杂的操作手续。方法简便、快速、准确,标准偏差小于０.050,变异系数小于０.60%,回收率为９８－１０２％。     

电位滴定法测定面粉中溴酸钾的含量

用电位滴定法可以定量检测出面粉中溴酸钾的含量,水溶液中溴酸根最低检出限可达到0.5μg/mL,其回收率可达93.6%;在面粉中其最低检出限为10 mg/kg,在30 mg/kg浓度下其回收率可达81%以上.