Damage Development in Gray Cast Iron under Static Deformation

The authors discuss the results of experimental investigation of structural degradation of gray cast iron at various stages of static tensile deformation. Analysis of the deformation process has revealed that damageability of a material under loading can be assessed by both a special strain parameter and scatter of hardness characteristics or a ratio of the modulus deviation to the current value of the elastic modulus. A correlation between these parameters has been established.     

电子显微学在结构生物学研究中的新进展

电子显微学是结构生物学的重要分支，已经成为一种公认的研究生物大分子、超分子复合体及亚细胞结构的有力手段。本文先回顾了近期电子显微学在技术上的新进展，后概述了生物电子显微学的三个组成部分——电子晶体学，单颗粒技术，电子断层成像术的基本原理，技术方法与研究现状。最后，对电子显微学与其他结构生物学研究手段的结合以及电子显微学的未来发展做了简单的展望。     

ㄇ形梁剪力滞效应的解析解

精确分析ㄇ形梁在纵横向荷载共同作用下,其横断面上正应力分布规律对于计算其有效宽度有重要意义,应用力法原理,先将ㄇ形梁和翼板截开成矩形截面梁和平面应力板,在截面上代之以赘余的分布剪力,对于平面应力板,通过利用板变形的对称性来简化其边界条件,然后假设一个满足板的控制方程的Airy应力函数求得板的应力和位移,再利用Timoshenko梁理论求得梁的挠度和转角,根据截面上梁与板的纵向位移相等的变形协调条件便可最终确定截面上的分布剪力,给出的数值算例验证了方法的有效性,并与铜陵长江公路大桥主梁的模型有限元结果和试验结果作了对比,解析解法还可用来检验其他各种数值计算方法的精度,并可推广到其他多跨薄壁结构梁桥的膜应力分析中。     

永升城基础大体积混凝土施工的裂缝预控

基础大体积混凝土施工的裂缝控制 ,从分析产生裂缝的原因来阐述 ,将冷缝作为结构性裂缝来预控     

东濮凹陷三春集下第三系隐蔽油气藏研究

东濮凹陷三春集地区下第三系隆起带各高点勘探效果较东翼斜坡带差，但具备形成隐蔽油气藏的地质条件，该地区沙四上亚段－沙三下亚段烃源岩晚第三纪早中期产烃规模有限，生成的油气沿着断层向固阳洼陷西侧运移，在春东断层下降盘中的反向屋脊岩性圈闭中富集。通过石油地质综合研究，预测固阳洼陷西侧为三春集构造带陷蔽油气藏滚动勘探的有利地区。图3参2（张建军摘）。     

Synthesis of heterocyclic metal complexes and their evaluation as marine antifoulants

4-Amino-3-thio-1,24-triazolidine (L₁) and 4-amino-5-thio-1,3,4-thiadiazole (L_II) as well as their metal complexes of the general formulae ML_I·2H₂O and ML_IICl (M; Pb(II), Cd(II) and Zn(II)) were prepared. With Sn(II), we obtained Sn(L_I)₂·2H₂O and SnL_IICl, respectively. The structures of the compounds were identified through elemental analysis, and IR and UV spectra measurements, in addition to thermal analysis in case of the metal complexes. The antifouling properties of the compounds were tested by their incorporation into paint formulations which were applied to PVC substrates and tested in water from Alexandria western harbour. When the compounds were added at 17·5% by volume, the coated panels were fouled after 3 months of immersion. The addition of 6·7% by volume of tributyltin oxide to 15·8% of the prepared compounds in one formulation elevated the paint efficiency and prevented fouling for 11 months. Paint containing solely tributyltin oxide at the same concentration was inactive against algae.     

濮城油田东西区沙二下顶面微构造特征与剩余油分布

濮城油田沙二下是一个被断层复杂化了的断块型油气藏，通过对储层的精细描述表明，各砂岩组顶面微构造发育，其成因有2种，与构造作用有关的微构造及与构造作用无关的微构造，前者规模较大，后者规模通常较小，根据微构造的起伏变化和形态，可分为3类：正向微构造，负向微构造，斜面微构造，正向微构造是油气富集与控制剩余油分布的重要微构造。     

广州地铁一号线隧道结构变形监测及成果分析

介绍了广州地铁一号线运营以来的全线隧道结构变形监测 ,分析了隧道结构的安全状况和各种变化规律 ,并对其变形原因进行有益的探讨     

局部设有钢筋砼电梯井墙的设计探讨

本文就局部设有钢筋砼电梯井的工程计算及理论分析，阐明分析了少墙的框剪结构的设计及注意问题。     

全球趋向统一的《粉末冶金零件材料规范》

评述了ISO 5 75 5“烧结金属材料—规范”和美国MPIF标准 35的变迁和趋向统一。阐述了“最小强度值”的意义。说明了我国粉末冶金结构零件材料标准的现状