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.     

高阶神经网络容量分析

分析了高阶Ｈｏｐｆｉｅｌｄ神经网络的存储容量，给出了一种计算最大存储容量的方法，分析了计算结果的精确度，并用切比雪夫方法对分析结果进行了拟合。     

生物演化机制探讨

根据古生物系统演化资料和相关的生物资料,论述了生物本身是其演化的物资基础,突变起主导作用,渐变为辅。在生物系统演化过程中,普遍表现出间断平衡的演化形式;不同门类具有理想的相似造形本能;同一系统不同支系,具有同步定向的平行演化特性;地理隔离并不改变其固有属性以及绝灭特点等,都表明生物本身起主导作用,环境的作用是第二位的、次要的。自然选择对于系统演化中的基因突变是不起作用的。     

行星齿轮变速箱换挡过程的建模与仿真

利用多体系统动力学方法 ,建立了行星齿轮变速箱的换挡过程的动力学模型及换挡过程自动变速系统的运动微分方程 ,并进行了仿真计算。模型的建立为换挡过程的仿真与控制提供了理论基础 ,为改善换挡品质提供了可行的途径     

玄武岩纤维成型区粘性流动过程的数值模拟

玄武岩纤维的成型过程是制备玄武岩纤维的关键，研究其流动、传势规律及参数变化对提高玄武岩纤维质量，减少断丝，增加纤维强度具有重要意义。通过建立成型过程中流动和传热的数学模型，在合理简化后进行数值模拟，得出了玄武岩纤维丝根处的温度、速度、粘度的分布以及丝根的几何形状。计算结果显示：丝根呈圆锥形，距离漏嘴2.5mm左右处为上丝根和中丝根的分界点；上丝根丝根的半径变化率大于中丝根的半径变化率；丝根的几何尺寸与漏嘴直径及最终纤维直径有关；中丝根区的速度、温度、粘度的变化率最大，是纤维成型的主要区域；纤维的固化点取决于纤维与周围环境的换热条件。     

阳极支撑氧化物半电池还原微观形貌研究

固体氧化物燃料电池在使用中存在还原过程,微观形貌会发生变形．将半电池试样在管式炉中进行还原反应,通过SEM观察其微观形貌反应前后的变化,利用能谱测定反应前后的元素原子比重．研究结果表明：电解质氧化钇稳定氧化锆（YSZ）薄膜表面形貌还原前后变化不大,表面平整光滑;截面形貌变化明显,还原后变为融合状态．阳极支撑Nio／YSZ截面颜色变化明显,还原后变为灰色的Ni／YSZ．YSZ陶瓷小颗粒状的出现,表面突出不平整,有明显的断裂解理台阶,层片状的NiO,表面光滑平整．还原反应使NiO相变成Ni相,不再与YSZ包覆在一起,独立的Ni相增多．     

从《汉书·儒林传》看《儒林外史》的艺术构思

《儒林外史》题名中的"儒林"和"史"字都透露出它与史传文学之间有着密切的关系。《儒林外史》的艺术构思在人物出场的线索设置、人物退场方式以及主旨确立等方面受到《汉书.儒林传》的诸多启发。《儒林外史》虽曰"外史",却是依托"正史"进行艺术构思,从而探索出了一条汲取历史营养进行小说创作的新路。     

Influence of Lithological Characters of Coal Bearing Formation on Stability of Roof of Coal Seams

Lithology is one of the important factors influencing the stability of roof of coal seams. In order to investigate this, the phenomenon of underground pressure and distribution of pressure were studied by using the local observation and simulation test with similar materials. The observation results show that the distance of initial weighting and periodic weighting of the mudstone roof is shorter than that of sandstone roofs. The sandstone roof with a high strength has a longer distance of initial weighting and periodic weighting, the abutment stress on the working face is big and the height of caving and fracture zone is high. The peak point of abutment stress in the sandstone roof is near to the working face and the pressure bump is inclined to occur. The result is contrary to that in case of the mudstone roof with a low strength. While in the transition zone of nipped sandstone, roof rock-mass is broken and is poor in stability, therefore, it is difficult to hold the roof.     

梁的撞击动荷系数的改进计算

本文利用材料撞击的恢复系数推导了计算梁的弹性撞击动荷系数改进公式,而且与试验结果非常吻合,误差只有1.4%.     

表面活性剂存在下催化剂中钼含量的测定

研究了在火焰原子吸收光谱中表面活性剂对钼的增感作用 ,在 5 0mmol/L曲拉通X— 1 0 0(TX— 1 0 0 )和 5 0mmol/L十二烷基硫酸钠 (SDS)存在下 ,可使钼的吸光度增感 48% ,并且能消除Al、Cu、Mn、Ca、W、Fe、P、V 8种元素对钼的测定干扰。在聚四氟乙烯压力溶弹内 ,用王水作溶剂溶解试样 ,具有试剂用量少免受污染等优点。用此方法测定钼的检出限为 0 .0 5 7μg/mL ,加标回收率在 98.6%～ 1 0 1 .9%之间 ,相对标准偏差小于 0 .87% ,可直接用于催化剂中钼的测定。     

地铁隧道开挖引起地表沉降的数值模拟研究

大中型城市修建地铁是未来城市建设的一个重要方向,但是城市中环境复杂,地表沉降控制要求严格。因此,研究隧道开挖地表沉降变化规律,对沉降控制具有重要的实践意义。文章运用有限元数值模拟方法对青岛某标段地铁隧道工程进行分析,结合数值计算结果与现场实测数据,研究隧道在由断面开挖对地面沉降变化规律的影响,对比实际隧道开挖的监控数据,模拟结果表明,地表沉降仍在安全范围内,可以为类似工程沉降控制提供参考。