Consolidation behavior of cement- and lime/cement-mixed column foundations

The consolidation behavior of mixed in place cement- and lime/cement-mixed column was studied. Consolidation of the composite foundation was modeled as a three-dimensional axi-symmetric problem. The authors used the finite difference method to obtain the pore pressure variation with time at any location below the surface. A computer program developed by the authors was used to draw some interesting conclusions about the consolidation behaviors of cement- and lime/cement-mixed pile foundation. Finally, a combined model including the permeability coefficients of cement-mixed piles and soil, was studied and its feasibility was evaluated. Project supported by National Natural Science Foundation of China (No. 59908012) and Education Ministry of China     

论体育教学中的“玩”

体育是人类文化的重要组成部分。作为一门学科,体育教学与其它课程教学一样,有其固定的教学内容和一定的教学方法。但体育教学又不同于其它课程教学,它具有更广泛的活动空间和独特的教学方式。把“玩”合理地运用到体育教学中,寓教于玩,寓教于乐,是提高体育教学质量的有效手段。     

河南省高校篮球队发展现状及对策研究

本文以文献法、问卷调查法、逻辑分析法、专家访谈法对河南省高校高水平男子篮球队的现状进行分析,针对球队的管理体制、招生制度、训练、竞赛制度、教练员执教水平、球队经费来源等问题进行深入剖析,以期对高校球队改革提出合理化建议.     

DFT理论研究2-丙炔基-苯胺和丙炔的反应机理

采用密度泛函理论方法 B3PW91 研究AuCl催化2-丙炔基-苯胺和丙炔环化生成吲哚衍生物的反应机理. 结果表明, 吲哚衍生物的生成需经过六个步骤, 从活化能和相对能分析, 反应的氢转移过程控制整个反应的速率, 其活化能为215. 56 kJ/mol. 整个反应强放热396. 09 kJ/mol. 这有助于反应的发生, 而且AuCl易于从产物上离去.     

混凝土箱梁温度作用效应的时程分析

提出了混凝土箱梁结构非稳态温度场计算及温度效应的时程分析方法,编制了有限元程序,得到了箱粱内温度场、跨中挠度、轴向变形和应变等随时间的变化结果.通过将计算结果与某混凝土箱梁试验实测结果比较,证明了这一分析方法的可行性和电算程序的可靠性.由此得到的温度效应时程分析结果可直接与其他荷载效应组合,使得有关温度作用的结构设计符合工程结构可靠度设计统一标准的要求.     

Screening of plane S waves by an array of rigid piles in poroelastic soil

An array of rigid piles used as a screening barrier for plane shear （S） waves is investigated in a homogeneous unbounded space. The dynamic poroelastic theory of Biot is employed, under the assumption of an incompressible solid grain. Using Fourier-Bessel series, the problem of multiple scattering is solved by imposing continuity conditions and equilibrium conditions at the soil-pile interfaces with the translational addition theorem. A parametric analysis is conducted to investigate the influence of the permeability of poroelastic soil, separation between piles, number of piles and frequency of incident waves on screening effectiveness of the barrier, and the results are compared with those in an elastic soil medium. Computed results show that the intrinsic permeability of the soil medium displays an apparent effect on the screening of plane S waves.     

滚动轴承清洗机设计

分析了轴承清洗装王的性能、结构及特点，比较了四种设计方案，进行了设计，并应用于工程实际。     

Influence of water saturation on propagation of elastic waves in transversely isotropic nearly saturated soil

Biot's two-phase theory for fluid-saturated porous media was applied in a study carried out to investigate the influence of water saturation on propagation of elastic wave in transversely isotropic nearly saturated soil. The characteristic equations for wave propagation were derived and solved analytically. The results showed that there are four waves: the first and second quasi-longitudinal waves (QP1 and QP2), the quasi-transverse wave (QSV) and the anti-plane transverse wave (SH). Numerical results are given to illustrate the influence of saturation on the velocity, dispersion and attenuation of the four body waves. Some typical numerical results are discussed and plotted. The results can be meaningful for soil dynamics and earthquake engineering.     

Distribution and differentiation of myeloid-derived suppressor cells after fluid resuscitation in mice with hemorrhagic shock

Objective

To investigate the distribution and differentiation of myeloid-derived suppressor cells (MDSCs) in hemorrhagic shock mice, which are resuscitated with normal saline (NS), hypertonic saline (HTS), and hydroxyethyl starch (HES).

Methods

BALB/c mice were randomly divided into control, NS, HTS, and HES resuscitation groups. Three subgroups (n=8) in each resuscitation group were marked as 2, 24, and 72 h. Flow cytometry was used to detect the MDSCs, monocytic MDSCs (M-MDSCs), and granulocytic/neutrophilic MDSCs (G-MDSCs) in peripheral blood nucleated cells (PBNCs), spleen single-cell suspension, and bone marrow nucleated cells (BMNCs).

Results

The MDSCs in BMNCs among three resuscitation groups were lower 2 h after shock, in PBNCs of the HTS group were higher, and in spleen of the NS group were lower (all P<0.05 vs. control). The M-MDSC/G-MDSC ratios in PBNCs of the HTS and HES groups were lower (both P<0.05 vs. control). At 24 h, the MDSCs in PBNCs of the NS and HTS groups were higher, while the spleen MDSCs in the HTS group were higher (all P<0.05 vs. control). The M-MDSC/G-MDSC ratios were all less in PBNCs, spleen, and BMNCs of the NS and HTS groups, and were lower in BMNCs of the HES group (all P<0.05 vs. control). At 72 h, the elevated MDSCs in PBNCs were presented in the HTS and HES groups, and in spleen the augment turned up in three resuscitation groups (all P<0.05 vs. control). The inclined ratios to M-MDSC were exhibited in spleen of the NS and HTS groups, and in PBNCs of the NS group; the inclination to G-MDSC in BMNCs was shown in the HES group (all P<0.05 vs. control).

Conclusions

HTS induces the earlier elevation of MDSCs in peripheral blood and spleen, and influences its distribution and differentiation, while HES has a less effect on the distribution but a stronger impact on the differentiation of MDSCs, especially in bone marrow.