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.     

Research advances of un-symmetric constitutive theory of anisotropic viscoelastic liquids and its hydrodynamic behavior

Research advances of un-symmetric constitutive equation of anisotropic fluid,influence of un-symmetric stress tensor on material functions,vibrational shear flow of the fluid with small amplitudes and rheology of anisotropic suspension were reported.A new concept of simple anisotropic fluid was introduced.On the basis of anisotropic principle,the simple fluid stress behaviour was described by velocity gradient tensor F and spin tensor W instead of velocity gradient tensor D in the classic Leslie-Ericksen continuum theory.Two relaxation times analyzing rheological nature of the fluid and using tensor analysis a general form of the constitutive equation of co-rotational type was introduced.More general model LCP-H for the fluid was developed.The unsymmetry of the shear stress was predicted by the present continuum theory for anisotropic viscoelastic fluid-LC polymer liquids.The influence of the relaxation times on material functions was specially studied.It is important to study the unsteady vibrational rotating flow with small amplitudes,as it is a best way to obtain knowledge of elasticity of the LC polymer,i.e.dynamic viscoelasticity.For the shear-unsymmetric stresses,two shear stresses were obtained thus two complex viscosities and two complex shear modulus(i.e.first and second one) were introduced by the constitutive equation which was defined by rotating shear rate introduced by author.For the two stability problems of fluid,such as stability of hydrodynamic flow and orientational motion,were discussed.The results show that the polymer suspension systems exhibit anisotropic character.The PNC systems can exhibit significant shear-thinning effects.For more concentrated polymer nano-suspensions,the first normal stress difference change from positive to negative,which is similar to LC polymer behavior.     

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.     

当前民办高校融资难的成因及对策

针对民办高校所需办学经费无国家财政拨款,全部为自筹资金的现状,分析了形成当前民办高校融资难的原因,既有信贷政策、银行方面的因素,也有民办高校自身的因素.提出民办高校要生存,要发展,光靠举办者投入或捐赠以及每年的学费收入是不够的,还需要积极拓展更多融资渠道解决办校融资难的问题.     

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.     

谈中国服装模特的素质修养

分析了中国模特在文化基础、艺术修养、个性气质、职业道德等素质修养上存在的问题,并且针对性地提出了提高中国模特素质修养的对策：注重文化素养,提高艺术修养,创造舞台形象,关注时尚,认真工作,积极训练,遵守行规,尊重他人。     

浅谈日语第二外语教学

为了培养出来的学生能适应对外交流的需要,掌握两种或两种以上的外语是非常必要的。采用什么样的教学方法,怎样安排教学进度和设计教学程度,提高二外的教学质量,解决存在的问题有利于提高第二外语的教学质量,满足社会发展的需求。     

运用本量利分析法加强银行经营管理

运用本量利分析法,可以测定银行业务经营规模要达到什么水平才能保本,预测一定的业务量能够获得多少利润,实现一定的利润目标需要多大的业务量来保证,以及如何设立与调整撤并分支机构才能获得更大的经济效益等问题,对于提高银行经营管理水平具有十分重要的意义和作用。     

培养创新人才对教师的要求

培养创新人才 ,全面提高民族的创新能力 ,是中华民族赢得未来的希望之所在 ,而教师在培养创新人才 ,全面提高民族的创新能力的活动中起着至关重要的作用。为此 ,要求教师必须树立符合时代要求的教育观念 ;不断充电 ,形成多元化的知识结构 ;积极从事科研 ,努力提高创新能力 ;注重学生创新品格的培养 ;改革课堂教学内容和方法。     

浅谈车队的安全管理“四要”原则

车队安全管理是一项系统工程。在日常性的安全管理中必须坚持"四要"原则,即一要坚持制度,常抓不懈;二要结合实际,有的放矢;三要注重创新,寓教于乐;四要举一反三,警钟长鸣。     

在Visual Basic中嵌入Delphi窗体的应用技术

Delphi窗体嵌入到Visual Basic应用中,可充分利用Delphi的可视化窗体继承技术,并为项目组在语言工具选择上提供灵活性.在Delphi的DLL项目中添加窗体,并在其导出过程中完成窗体的创建、显示和释放;Visual Basic应用通过调用DLL的导出过程即可展示Delphi窗体.实现的关键是在导出过程的参数表中设置句柄参数,以便传递调用程序对象的实例句柄;若显示非模式窗体,导出过程还需返回窗体句柄,以便调用程序对窗体进行维护.     

试论校友资源开发与高校发展

校友资源是高校发展不可忽视的一支重要力量。文章分析了校友资源与高校发展的关系,并针对高校校友资源的现状,提出了充分利用校友资源发展高校的路径：重视高校校友工作,努力培育“三个意识”;积极响应校友诉求,深度开发校友资源;大力宣传校友事迹,发挥校友榜样作用;以校友带动校企合作,提升高校教育质量。     

对高工专土建专业教学改革的思考

目前高工专土建类专业在专业设置、课程体系、技能培养等方面都难以适应行业和社会发展的需要．因此应改变培养模式．按行业岗位需要设置专业．将“学科型”专业转变为“职业岗位型”专业,优化课程体系,强化专业基础．淡化专业．重视经营管理能力的的培养．按照“能力本位模式”培养学生的实践能力．重视人文知识教育．全面提高学生素质．     

基于岗位需求的装饰工程计价课程教学探讨

怎样有效提高学生的专业素质和实际能力,使之尽快地适应岗位需求,是装饰工程计价课程教学面临的现实问题.装饰工程计价课程应当围绕行业的岗位需求组织实训教学,不断提高学生的专业素质和对未来岗位的适应能力.基于此,对装饰工程计价课程如何组织实训教学进行了探讨.     

高校理想信念教育的缺失及对策

当前理想信念教育存在着各种缺失,加强高校理想信念教育是时代发展的必然要求。我们必须更新教育观念,贴近学生实际;厘清教育目标、明确教育层次;深化教育内容、帮助学生成长;创新教育方法,拓宽教学模式,以提高理想信念教育的实效性。