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.     

硼砂型渗剂的试制

对Ｎａ２Ｂ４０７、Ａｌ粉、Ｓｉ－Ｆｅ粉、碳粉、Ｎａ２ＳｉＦ６、Ｒｅ－Ｍｇ、Ｎａ２ＣＯ３、Ａｌ２Ｏ３、Ｎａ２Ｓ２Ｏ３、ＳＩＣ、Ｓｉ－Ｃａ粉、尿素等用正交试验法优选出硼砂型渗硼剂进行渗硼处理工艺的最佳成分配比设计；研究了渗剂配制及渗硼处理诸因素，如工业硼砂脱水完全性、还原剂的还原能力、混料的均匀性、处理温度、时间等对渗硼层质量（渗层深度、致密性、表层脱碳、表面光洁度、过渡区深度及硬度等）的影响，实现了优质无粘结渗硼．     

汶川Ms8.0级地震的水系响应

2008年5月12日龙门山汶川8.0级地震导致了映秀-北川断裂、彭县-灌县断裂、小鱼洞断裂和擂鼓断裂发生了地表破裂,在平面上显示为两条近于平行的北东向逆冲-走滑型断层,在剖面上显示为叠瓦状.汶川地震的地震破裂和同震变形在瞬间就改变了地形坡度,并导敛地貌和河流体系产生相应的变化和调整,记录了整个区域的位移情况,为探索地震与水系之间的关系提供了关键信息.在整合汶川地震所导致的地表破裂、地形和水系变化相关数据的基础上,描述了汶川地震驱动的逆冲作用和右旋走滑作用引发的河道垂向位错和水平位错,标定了汶川地震导敛的河道坡折点和河道转折点,刻画了映秀-北川断裂和彭县-灌县断裂和小鱼洞断裂等活动断裂对河床剖面、河道走向、河道分段性和不规则水系样式等方面的控制作用,探讨了汶川地震驱动了隆升作用对河流剖面的影响与调整,建立了汶川地震的水系响应及其识别标志.研究结果表明:汶川地震驱动的构造作用对该区水系的河道走向、河道坡折点、河道流转折点和河床剖面具有明显的控制作用,为重塑龙门山晚新生代构造-地貌-水系演化提供一个范例和定量约束条件.     

工程量清单报价中合理报价的确定

在工程量清单报价中,首先要明确投标目的、企业自身的实力和改进企业自身实力的方法,这是清单报价的基础;其次,根据以往投标价格估计对手的实力及可能的报价,预测投标中潜在的来自清单、建筑市场管理体制、施工企业的管理等方面的风险并采取相应的防范措施,将可能的损失减少到最小;再次,确定投标报价的策略,如报高价和低价的原则及不平衡报价法;最后根据招标情况,采取多方案报价、增加建议方案、突然袭击等投标技巧,以及通过横向或纵向联合投标做到强强联合、优势互补。增加投标的竞争力,并确定合理报价．     

中空玻璃用丁基热熔密封胶的研究

研究密封胶配方中丁基橡胶、萜烯树脂、填料、聚异丁烯、聚乙烯的用量对中空玻璃用丁基热熔密封胶性能的影响．结果表明：随丁基橡胶用量的增加,密封胶的冷流性与高温流动性减小,剥离强度与硬度增大;随萜烯树脂用量的增加,密封胶的冷流性、高温流动性、剥离强度及硬度均增大;随碳酸钙用量的增加,密封胶的冷流性、高温流动性及硬度增大,剥离强度先减小后增大;随聚异丁烯用量的增加,密封胶的高温流动性增大,冷流性能与硬度减小,剥离强度先增大后减小;随聚乙烯用量的增加,密封胶的冷流性、高温流动性及硬度减小,剥离强度先增大后减小,由此确定最佳配方．该胶具有良好的粘结性、抗冷流性、高温流动性以及防水气密性,能够满足中空玻璃密封和结构强度的要求．     

响应面法优化粗杂粮馒头的最优配比研究

与全小麦粉馒头相比,杂粮馒头具有保健功能,且在改善饮食结构和均衡膳食方面发挥重要作用,为研究口感好、营养丰富的复合粗杂粮馒头,通过单因素试验分析了不同添加量的大豆粉、小米粉、高粱粉以及不同添加量的水、酵母和发酵时间对复合粉馒头的白度、质构和感官评价的影响,并使用Box-Behnken响应面法对复合杂粮馒头的配比进行优化...     

基于正交试验的深基坑变形影响因素研究

运用正交试验原理,以深基坑土体的摩擦角、弹性模量、粘聚力、地连墙刚度、支撑刚度为影响因素,设定周边土体最大沉降、地下连续墙最大水平位移作为分析基坑开挖后变形的两个指标,对合肥地区逆作法深基坑稳定特征用数值模拟进行了分析。采用极差分析法揭示了各因素在深基坑开挖过程中的重要次序。结果表明在施工方式保持不变的情况下,地表沉降、地连墙水平位移的最显著影响因素均为土体的弹性模量,地表沉降的其他影响因素依次为地连墙刚度、土体黏聚力、支撑刚度、土体内摩擦角。地连墙水平位移的其他影响因素依次为地连墙刚度、支撑刚度、土体内摩擦角、土体黏聚力。     

辽东白云金矿地质体三维模型的构建与储量估算

矿体三维模型是数字矿山的基础,是矿床的数字表征。在收集和整理研究区的地质图、地形图、地质剖面图、钻孔柱状图的基础上提取钻孔数据（样品信息表、钻孔形态表、钻孔位置表）,建立地质空间数据库,借助于Minexplorer探矿者软件建立地表模型,并依据地质空间数据库生成三维钻孔,通过定义剖面,圈定单工程矿体,连接主要出露地层、控矿构造与蚀变带,编辑剖面,连接曲面,封装成体等过程,构建出地质体的三维数字模型,实现其三维可视化。然后采用截面法、块段法、距离加权法对矿体进行储量估算并与矿山实际勘探获得的产量进行对比分析。结果表明,本矿区距离加权法计算的结果相对误差最小,同时也反向验证了三维矿体模型构建的准确性。     

基于质量成本的高职专业群资源要素优化配置模型及运行

专业群建设是高职院校服务产业的基本载体,提高专业群建设效能需要优化资源配置。从质量成本观出发,高职专业群质量成本总额包括资源建设成本、办学运行成本、资源维护成本和质量改进成本,专业群产出包括专业群学生规模、培训规模、应用技术研究到款额,二者比值是单位质量成本。以最低单位质量成本为目标,设置建立高职专业群资源要素优化配置函数和约束条件,在此基础上,构建专业群师资要素资源、实习实训条件要素资源、课程要素资源优化配置数学模型。适应高职专业群资源要素优化配置模型运行需求,可以采取建立专业资源统筹配置机制、建立专业群资源共享机制、建立专业资源有效度评估机制、建立专业布局调控机制等举措。     

基于逻辑推理和表象推理的类人机器智能——思维计算

在深入分析思维和智能研究理论的基础上,首次提出了思维计算的概念,并给出了定义。进而给出了其主要研究内容、研究途径以及应用范围。思维计算是以认知科学、脑科学、神经科学的研究理论为基础,结合人工智能学的研究方法和手段,以思维的形象性、创造性、不确定性的研究为突破口,采用逻辑思维和形象思维双线并行模型,研究逻辑推理和表象推理的综合机制,实现较高层次的类人机器智能。     

县域经济发展的问题分析与路径选择

当前我国县域经济发展中存在的问题主要有传统农业的低效率、中小工商业发展不足、滞后的城镇化、基础设施和人力资源缺乏、资源利用与环保矛盾凸现。促进县域经济又好又快的发展，需要创新农业发展思路，改造县域传统农业；突出个性项目建设，加快特色经济发展；加快城镇建设进程，开拓经济发展空间；优化经济发展环境，增大政府财政投入；加强自然环境保护，促进经济持续发展。