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.     

N~＋离子注入对不锈钢性能的影响

研究了注入Ｎ＋的１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢表面改性层的性能．对样品进行了显微硬度测定．用电化学方法测定了在硝酸磷肥混酸介质中静态弱极化曲线，并自制一台磨蚀试验装置，测定了动态弱极化曲线．结果表明，显微硬度随注入剂量增大呈线性升高．耐蚀性及耐磨蚀性能随注入剂量的不同差异较大．适量的Ｎ＋注入可显著提高不锈钢的耐蚀及耐磨蚀能力，高剂量注入导致耐蚀性能下降．     

高速钢激光相变硬化层的韧性试验研究

本文采用声发射法，对Ｗ１８Ｃｒ４Ｖ高速钢的激光相变硬化层进行了韧性测定，分析了激光相变强化工艺对高速钢韧性的影响。结果表明，激光强化能显著提高Ｗ１８Ｃｒ４Ｖ钢的韧性。     

高速钢回火处理的分析研究

以W18Cr4V、9W18Cr4V两种高速钢与T12在相同实验条件下做硬度测试,并绘制曲线作对比,找出高速钢在经过淬火回火处理后热硬性不同于普通碳素钢的原因,并且作显微组织观察,分析其回火后组织的变化.     

高速钢W18Cr4V的锻造及热处理

对W18Cr4V钢的性能特点进行了分析,阐述了W18Cr4V钢的锻造及热处理工艺的合理制定。     

高合金钢的激光诱导低压射流复合加工研究

分析激光诱导低压射流复合加工的理论可行性,设计一种激光诱导低压射流复合加工试验装置,并用其进行W18Cr4V高合金钢的精密加工试验研究,分析不同的激光工艺参数和射流加工参数对试样材料的刻蚀量以及截面加工质量的影响,最终得到一组相对较优的复合加工工艺参数．     

高速钢表面PN＋PVD复合处理工艺和性能研究

采用多弧离子镀设备,在高速钢W18Cr4V上先进行等离子氮化,再沉积TiN薄膜,研究了不同渗氮温度和时间对PN＋TiN薄膜组织和性能的影响。结果表明,温度为500℃左右和时间为2h以上条件下对W18Cr4V进行渗氮处理后再沉积TiN薄膜,可以得到最佳的薄膜表面显微硬度（1800～2000HV0.05）和膜／基结合力（50N）,涂层耐磨性也得到明显提高。     

W18Cr4V钢冷镦冲头沉积氮化钛研究

用活化反应离子镀技术在Ｗ１８Ｃｒ４Ｖ钢冷镦冲头上沉积氮化钦，对氮化钛涂层进行了晶体结构和组织形貌分析，测试了涂层深度及硬度，涂层冷镦冲头经生产应用考核，使用寿命提高２～３倍．     

W18Cr4V钢离子渗氮─—高频复合处理后组织与性能的研究

研究了Ｗ１８Ｃｒ４Ｖ钢离子渗氮─—高频复合处理后的组织与性能。并进行了耐磨性和刀具使用寿命的对比试验。结果表明，该钢经复合处理后，具有较好的表面硬度和良好的耐磨性，显著地增加了刀具的使用寿命。证明该工艺应用于小型高速钢刀具的热处理是可行的。     

离子氮化—PECVDTiN膜复合处理提高切边模具寿命研究

对用于制作冷作模具的两种高速钢W18Cr4V和W6Mo5Cr4V2Al进行离子渗氮-PECVDTiN复合处理,研究了复合处理层的组织与性能特点,结果表明：较之单一PECVD TiN,离子渗氮-PECVDTiN复合处理改善膜基界面结合,显著提高膜基结合强度与耐磨性;采用优化的复合处理可提高高速钢制不锈钢六角螺栓切边模使用寿命一倍以上。     

YG8硬质合金表面的C＋V双离子注入研究

为了增强YG8硬质合金的性能,应用金属蒸汽真空弧离子源在其表面进行了几种不同剂量的C＋V双离子注入处理.通过金相显微镜、X射线衍射以及拉曼光谱等方法,对注入试样表面进行了结构表征和分析.实验结果表明：注入后硬质合金表面有C、VC和V7O3等新相生成,且C＋V双离子注入对形成类金刚石结构有积极地促进作用;此外,还发现了样...