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.     

新型三元混合制冷剂R32/R125/R161替代制冷剂R407C的实验研究

在搭建的电量热器制冷剂性能测试台上，对三元混合制冷剂R32/R125/R161和制冷剂R407C进行了实验研究.R32/R125/R161的物性与R407C相似，且环境性能良好，其臭氧消耗潜能（ODP）值为零，其全球变暖潜能（GWP）值小于R407C.实验结果表明，在过冷度相同、冷凝温度不同的情况下，2种制冷剂的循环性能参数，如压缩机功耗、循环性能系数（COP）、单位体积制冷量、制冷量随蒸发温度的升高而增大，压比与排气温度随蒸发温度的升高而降低；在蒸发温度相同的情况下，采用R32/R125/R161的运行压比和压缩机功耗均低于R407C，COP、单位体积制冷量和制冷量大于R407C，排气温度略高于R407C.当冷凝温度相同时，2种制冷剂的COP、单位体积制冷量随过冷度的增大而增大.理论与实验分析表明，R32/R125/R161可以作为R407C的替代制冷剂直接使用.     

交换半环上严格上三角矩阵代数的自同构

设R是含有单位元的交换半环,Nn（R）是R上的n阶严格上三角矩阵代数.本文利用矩阵的一些性质,得出了R-代数Nn（R）上的自同构的一些结论,即（1）当n=2时,AutNn（R）=DigNn（R）;（2）当n=3时,AutNn（R）DigNn（R）∝InnNn（R）;（3）当n≥4时,AutNn（R）DigNn（R）∝（CenNn（R）∝InnNn（R））.     

R32／R134a绝缘性能检测及其可燃性研究

对两种四个规格的绕组线作了耐Ｒ３２／Ｒ１３４ａ实验，对六种氟利昂和四种成份的Ｒ３２／Ｒ１３４ａ的可燃性进行试验，结果表明Ｒ２２，Ｒ１３４ａ，和Ｒ３２和Ｒ３２／Ｒ１３４ａ均属有源可燃物质。     

环的直积的零因子图

研究了交换环的直积R1×R2的零因子图.对于交换环R1和R2,讨论了零因子图Γ(R1×R2)的直径与围长,分别确定了当图Γ(R1×R2)的直径为1,2,3时,对应的交换环R1和R2的代数结构,并给出了环的等价表述.     

有限环上的全矩阵环零因子个数的估计

设R是含有q(q>2)个元素的有限环,且R可交换,含有单位元e.本文得到了有限环R上n级全矩阵环零因子个数的估计.     

适用于R32/R134a及R407C的润滑油研究

本文对替代工质R32/R134a和R407C与不同型号的酯类POE油的配合性进行了试验研究，压缩机加速寿命试验研究结果表明，RO-32油和RO-40油不宜作为替代工质R32/R134a的YZG-27R型压缩机用油，而EAL-46油可以作为R32/R134a的YZG-27R型压缩机用油，EAL-68型POE润滑油加入少量添加剂可以作为R407C的YZB-20R型变频压缩机用油。     

一类广义幂级数环的有限维数

令R是一个有单位元的完备的凝聚交换环,研究并比较了R的有限维数与R上的广义幂级数环[[R≤,S]]的有限维数的关系,得到了一些有限维数不等式.结果表明:如果R是一个完备的凝聚的有单位元的交换环,则R的有限投射维数不超过[[RS,≤]]的有限投射维数;令R是一个完备的凝聚的有单位元的交换环,则R的有限内射维数不超过[[RS,≤]]的有限内射维数;如果R是一个完备的凝聚的有单位元的交换环,则R的有限弱维数不超过[[RS,≤]]的有限弱维数.     

工况对R22及替代工质有效过热循环性能的影响

为解决R22替代过程中制冷系统回热器的再设计问题,以热力学计算分析的方法对运行工况参数对R22及其7种替代制冷剂的有效过热循环性能的影响进行了研究.结果表明,决定有效过热对制冷循环的性能是否有利的因素除了工质种类外。还有运行工况参数;有效过热对R22、R152a和R410A的制冷循环性能的影响是否有利取决于具体工况;有效过热对R407C、R134a、R290和R507的制冷循环性能的影响总是有利的,而对R717的制冷循环的性能总有负面影响.     

辽宁耐寒杜鹃花资源调查

对辽宁地区耐寒杜鹃花资源进行了详细的调查。结果:①辽宁野生杜鹃花共有6个种和1个变型,6个种分别是:牛皮杜鹃(R.aureum)、无名杜鹃、大字杜鹃(R.schilippenbachii)、照白杜鹃(R.micranthum)、兴安杜鹃(R.dauricum)、迎红杜鹃(R.mucronulatum);1个变型是缘毛迎红杜鹃(R.mucronulatum f.ciliatum)。广泛分布在辽宁地区的山地林中或山顶。由于分布区大多离居住区较远,加上相关部门的有效保护,野生植株生长状况良好,种群数量稳定。②辽宁地区自然条件下栽培的露地杜鹃花有6种,有观赏价值的变型2个。可依花期分为早花型(迎红杜鹃、毛叶迎红杜鹃、兴安杜鹃),花期4～5月;中花型(大字杜鹃、淀川杜鹃R.yedoense、黄杨杜鹃R.yedoense‘huangyang’、红枫杜鹃Rhododenron‘hongfeng’),花期5～6月;晚花型(照白杜鹃),花期6～7月。     

交换环上李超代数osp(R)的理想

设R是有单位元1的交换环,2是R的一个单位.通过对 R 上的正交-辛李超代数 osp(R)的基底、中心及阶理想的研究,讨论了 osp(R)的理想与 R 的理想的关系,证明了 osp(R)的所有理想都是极小理想,从而也是标准理想.