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.     

[BPy]Br和[BMIm]Br微波辅助合成动力学

在微波反应仪中,于微波辐照下分别由吡啶、N-甲基咪唑与溴代正丁烷合成了溴化N-丁基吡啶([BPy]Br)及溴化1-甲基-3-丁基咪唑([BMIm]Br),利用AgNO3电位滴定法测定了动力学数据,建立了动力学方程,研究了反应物、温度、溶剂对反应动力学的影响,并对微波作用机制进行了探讨。结果表明:反应遵循SN2历程,总包反应级数为二级;反应速率常数较传统加热方法提高近10倍,且随温度升高而增大;在异丙醇中合成[BPy]Br比在正庚烷中的速率常数值约高5倍;合成[BMIm]Br的活化能为30.39 kJ/mol,合成[BPy]Br的活化能为92.17~97.27 kJ/mol。与传统加热方法的动力学数据相比,微波作用不改变反应历程和活化能,但通过提高反应频率因子的方式能显著加快反应速率。     

4-(6-氧-6H-二苯并(c,e)(1, 2)氧磷杂己烷-6-取代)羟甲基苯甲醛的合成与表征

以对苯二甲醛和9, 10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)为原料合成新型含醇羟基和醛基的有机磷阻燃剂中间体4-(6-氧-6H-二苯并(c, e)(1, 2)氧磷杂己烷-6-取代)羟甲基苯甲醛(DOPO-HO-BD)。探讨原料比和反应温度对反应结果的影响,结果表明,DOPO与对苯二甲醛摩尔比为1.1:1、反应温度30 ℃时与二氧六环中反应7 h,DOPO-HO-BD收率为89.3 %。采用傅里叶红外光谱(FT-IR)、核磁共振和质谱表征了DOPO-HO-BD的结构,热失重分析结果证明,DOPO-HO-BD初始分解温度为211 ℃(质量损失率1%),800 ℃时残炭率高达29.7 %。       

关于边界元中[G]和[H]矩阵的存贮问题

本文采用边计算、边交换,边存放的办法。对于边界元中[G]和[H]两个矩阵,只用一个数组存放,这样大大地节省了内存。提高程序的解题能力可达60%左右。     

减压下正丁醇—乙苯系汽液平衡的研究

使用Rose—Williams装置:测定正丁醇—乙苯体系在400和600mmHg压力下的汽液平衡数据。用Herrington经验方法和Van Ness点检验法,对测定数据进行了恒压下的热力学一致性校验。并用VanLaar、Margules、Wilson和NRTL方程进行了热力学关联,得到较为满意的结果。     

离子液体[HMIM]Br和[HMIM]BF_4对SiO_2气凝胶制备的影响

利用离子液体[HMIM]Br、[HMIM]BF4作催化剂,TEOS作前驱体在常压下制备出了高孔隙率块状SiO2气凝胶,并研究了离子液体对气凝胶制备的影响。离子液体[HMIM]BF4比[HMIM]Br拥有更好的催化性能,可以大大缩短凝胶时间,且两种离子液体制备凝胶过程中,凝胶时间都随n(IL)/n(Si)的增加而逐渐延长。在n(IL)/n(Si)=1.5时,制得密度最小、孔隙率最大的气凝胶;n(IL)/n(Si)>1.5时,随离子液体的摩尔比率的增加,气凝胶的密度增大,孔隙率、成块性和透明性逐渐降低。     

离子液体[HMIM]Br和[HMIM]BF4对SiO2气凝胶制备的影响

利用离子液体[HMIM]Br、[HMIM]BF4作催化剂,TEOS作前驱体在常压下制备出了高孔隙率块状SiO2气凝胶,并研究了离子液体对气凝胶制备的影响.离子液体[HMIM]BF4比[HMIM]Br拥有更好的催化性能,可以大大缩短凝胶时间,且两种离子液体制备凝胶过程中,凝胶时间都随n(IL)/n(Si)的增加而逐渐延长.在n(IL)/n(Si)=1.5时,制得密度最小、孔隙率最大的气凝胶;n(IL)/n(Si)>1.5时,随离子液体的摩尔比率的增加,气凝胶的密度增大,孔隙率、成块性和透明性逐渐降低.     

Rheological properties of gamma irradiated [Me_3NC_2H_4OH]~+[Zn_2Cl_5]~- and [Me_3NC_2H_4OH]~+[Zn_3Cl_7]~- ionic liquids

The objective of this work is to verify the rheological behavior of irradiated [Me3NC2H4OH]+[Zn2Cl5]-and [Me3NC2H4OH]+[Zn3Cl7]-ionic liquids in comparison to the unirradiated ones,the viscosities were measured by a strain-control experiment under different irradiation doses’ samples(0,10,20,50,100 kGy) at different shear rates and temperatures.The curves of shear stress against shear rate present that the viscosity of ionic liquid is insensitive to shear rate;the viscosity of ionic liquids decreases with increasing temperature,and can be fitted by Arrhenius equation very well.Gamma radiation causes a decrease of viscosity of [Me3NC2H4OH]+[Zn3Cl7]-by greater than 10%,but it does not impair the viscosity of [Me3NC2H4OH]+[Zn2Cl5]-(within the experimental error) except 20 kGy irradiated sample.The results show that the radiation stability of [Me3NC2H4OH]+[Zn2Cl5]-is higher than that of [Me3NC2H4OH]+[Zn3Cl7]-.     

[1]-苯并氧杂(艹卓)并[3,4-b]喹啉-13(6H)-酮衍生物的合成

〔１〕－苯并氧杂Ｚｈｕｏ并〔３，４－ｂ〕喹啉－１３（６Ｈ）－酮的羧基和亚甲基通过Ｗｉｔｔｉｎｇ重排－空气氧化，还原，取代，加成、Ｓｃｈｏｔｔｅｎ－Ｂａｕｎｍａｎｎ反应，得到６个新衍生物，并通过元素分析、质谱，红外光谱，核磁共振予以证实。     

再生核空间H^1[0，1]中的多尺度分析

小波分析在工程和技术的许多领域得到广泛应用，研究小波理论是必要的。人们所讨论的一维小波的构造都产生L^2(R)的基。在某些应用中，我们感兴趣事的仅仅是实轴的一部分：如数值分析计算往往只在一个区间上有效；图像集中在一个短形框内；许多分析声音的系统将声音分成块等。所有这些都涉及到对支集在一个区间上的函数f的分解，比如说支集在[0，1]上．当然，令f在[0，1]以外为零，而用标准的小波基去分析它也是可以的，只是这将人为地在边界上造成跳跃．因此，研究适用于区间上的函数的小波是有意义的。这篇文章是首次在再生核空间H^1[0，1]讨论多尺度分析。本文利用积分算子建立了Hibert空间L^2[0，1]与再生核空间H^1[0，1]之间的同构映射，给出再生核空间H^1[0，1]中的多尺度分析方法、小波逼近公式和采样公式。