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.     

节能与分布式能源的发展

节约能源是实现我国经济可持续发展的必然要求.分布式能源的特点是综合利用、梯级利用,可以大幅度提高能源转换效率,减少能源输送损失,以高效、经济、安全、环保的优势,实现能源利用效率的最大化,切实解决能源深度利用问题,符合科学发展观的要求.因而,我国的节能战略需要大力发展分布式能源,我国的节能战略也离不开分布式能源的发展.     

加速新能源和可再生能源的开发利用

概述了世界和中国的能源及环保形势，阐述了在我国开发利用新能源和可再生能源的巨大潜力和重要意义，并对新能源和可再生能源的开发利用提出了一些建议。     

可再生能源采暖系统的能耗分析

我国可再生能源资源潜力大,在未来的建筑采暖能源供应中可以形成举足轻重的地位;笔者以长春地区某建筑为依据,对太阳能采暖系统、地源热泵系统,以及常规能源系统（燃气锅炉）的热源部分进行了详细的能耗分析和比较,得出严寒地区冬季采暖选用地源热泵采暖系统节能效果显著的结论．为长春市及严寒地区利用可再生能源供暖提供可靠的节能性数据．     

能量收集的无线传感器节点能量管理策略

针对能量收集无线传感器网络中传感器节点电池存在存储损耗和容量衰减特性的问题,建立了末梢节点电池存储损耗和容量衰减的通信模型,研究了无线传感器生命周期内吞吐量最大化的问题。将系统优化问题转化为凸优化问题,通过凸优化分析得到与当前能量收集水平、电池能量水平以及信道增益相关的信息传输功率控制策略;提出了适应电池存储损耗和容量衰减的双功率阈值算法,用于优化平均吞吐量;提出了最小化放电空间的电池充放电管理策略抑制电池容量的衰减速度,优化无线传感器的生命周期,并对无线传感器生命周期与电池放电空间进行理论估计。仿真结果表明,在不同电池存储效率、放电空间比例下,本文提出的双功率阈值算法相较于自适应定向注水算法能够通过减少电池的频繁充放电次数,降低收集能量的存储损失,优化了无线传感器的平均吞吐量和生命周期,使生命周期内的吞吐量最大化。     

高能耗变压器节能改造的研究

本文首先从理论上进行了论证,其次将SJ100KVA变压器节能改造为85KVA为例,采取更换绕组,优选最佳容量的方案,合理可行.并经测试表明主要技术性能指标符合国家有关部门的标准.在国内同类研究中,减容最少,节能效果最佳,经济效益和社会效益显著.最后进一步论述高能耗变压器节能改造     

经济能源在空调节能技术中的应用

介绍了目前空调节能技术的发展状况，提出经济能源的利用是空了能技术的重要内容之一，并简要介绍了几种利用经济能源实现空调节能的方式。     

能源与环保

世界最大屋顶光伏发电项目开工世界最大的屋顶光伏发电项目——广西玉柴机器集团厂区连片并网发电项目在玉林市开工。该项目对广西省开发利用新能源、推广节能发电具有重要意义。     

能源与环保

CAP1400非能动堆芯冷却系统试验设施项目开工我国大型先进压水堆重大专项CAP1400非能动堆芯冷却系统试验设施项目(简称"ACME项目")在清华大学开工。该项目的开工,标志着国家重大专项课题ACME项目进入了工程建设阶段,为按时提交验证和评审关键试验数据并支持CAP1400系统设计奠定了良好基     

能源与环保

我国高原风力发电技术取得新突破青海省一项名为"适应青海风资源特点的风力发电机组研发及并网试验研究"的项目通过了专家评审。专家认为,该项目研究成果填补了国内大型垂直轴风电机组的空白,意味着我国在高原风力发电     

能源与环保

我国首台核电站全范围模拟机投入使用我国首台自主研发设计的百万千瓦级核电站全范围模拟机在福建宁德核电站正式投入使用,标志着我国核电在自主设计、自主制造、自主建设、自主运营的道路上又迈出了重要的一步,结束了我国使用的全范围模拟机长期依赖进口的局面。