Effects of compressive and tensile stress on the growth mode of epitaxial oxide films

Oxide films were deposited on different substrates by laser molecular beam epitaxy. Reflection high-energy electron diffraction was performed to in situ investigate the change of growth mode and the lattice relaxation during the growth. An asymmetrical phenomenon was found in the two kinds of strain states, compressive stress and tensile stress of heterostructures with different lattice mismatch. In the case of BaTiO₃/SrTiO₃ (2.2%), 2D layer-by-layer growth mode without lattice relaxation can be maintained for a longer period for BTO films on STO with compressive stress, comparing to STO films on BTO with tensile stress. When MgO films were deposited on SrTiO₃ with a large mismatch of 7.8%, compressive stress leads to rapid lattice relaxation with a very thin wet layer, and 3D strained island were observed. As a comparison, SrTiO₃ films on MgO with tensile stress were configured. No RHEED patterns can be observed duo to a large tensile stress.     

装备知识管理效用及实施策略分析

知识军事时代，知识逐渐成为战斗力提升的核心要素。武器装备的知识化管理，即装备知识管理，作为一种新的管理理念逐渐引起人们的重视，并将成为武器装备管理发展的新趋势。从探讨装备领域实施知识管理（knowledge management，KM）的重要性及目前装备工作中存在的现实问题出发，从提高装备决策质量、提升装备人才工作能力、防止装备知识流失、促进装备知识传递等方面分析了实施装备知识管理可能产生的效用。同时，还分析了装备知识管理实施的基本策略，以此为基础概括出了装备知识管理具有操作意义的实施步骤。     

烧结砖与墙体材料革新

1中国墙体材料的发展中国经济的快速发展拉动了建筑业及其相关的墙体材料的需求与生产,墙体材料获得了很大发展。1.1墙体材料品种越来越丰富,基本适应了建筑业的需求     

Behaviors of concrete-filled steel tubular members subjected to combined loading

The present study is an investigation on the behaviors of concrete-filled thin-walled steel tubular members subjected to combined loading, such as compression and torsion, bending and torsion, compression, bending and torsion. ABAQUS software is used in this paper for the finite element analysis (FEA). A comparison of results calculated using this modeling shows generally good agreement with test results. The FEA modeling is then used to investigate the influence of important parameters that determine the ultimate strength of the composite members under combined loading, such as compression and torsion, bending and torsion, compression, bending and torsion. The parametric studies provide information for the development of formulae for calculating the ultimate strength of the composite members subjected to combined loading.     

碳酸盐岩气藏加砂压裂重复改造试验效果分析

针对碳酸盐岩气藏部分气井生产效能低的状况，决定在长庆气田下古生界尝试开展加砂压裂重复改造试验，以期提高低产、低效气井的产量，延长气田稳产期。通过潜心研究、精细设计及现场质检监控，优选了4口老井进行加砂压裂重复改造现场试验。从试验结果来看，虽然只有1口井取得明显的改造效果，但4口井加砂压裂施工都是成功的，说明对碳酸盐岩气藏实施加砂压裂是可以实现的，但在选井思路和压裂工艺方面还有待探索和研究。     

非烧结砖的发展、问题及对策

非烧结砖是相对于烧结砖而言的，即不经烧结而用于砌筑墙体的砖。     

PURIFICATION AND PROPERTIES OF TRANSGLUTAMINASE FROM STREPTOVERTICILLIUM MOBARAENSE

Transglutaminase (TGase) was separated from the culture broth of an isolated strain of Streptoverticillium mobaraense. The crude enzyme was prepared by centrifugation, ultrafiltration, precipitation by alcohol, centrifugation and freeze‐drying. The yield after these processes was 65–70%. Then the enzyme was purified to homogeneity by chromatography on CM‐cellulose and Sephadex G‐75 on which the yields were about 70% and 80%, respectively; the purified folds reached 2.5–4.7 and 1.08–2.06, respectively. The molecular weight of this TGase was 39,500–40,100 Da by gel filtration chromatography. Optimum enzyme activity was observed in the pH range of 5.0–7.0, and it was maintained stable at 20–40C. The optimal temperature and pH was 52C and 6.0, respectively. At 1 mM and 5 mM metal ion or inhibitors concentration, TGase activity was strongly inhibited by Zn²⁺ and NEM, and not affected obviously by Ba²⁺, Ca²⁺, Co²⁺, Cu²⁺, Fe²⁺, Fe³⁺, Mg²⁺, Mn²⁺, Na⁺ as well as PMSF and EDTA. The effects of these additions on this TGase were compared with those of other microbial TGases.     

天津市水环境污染综合整治思路

天津市位于海河流域下游．历史上曾得益于海河丰沛的水资源，自进入20世纪70年代以后．由于流域内人口增长、经济发展、用水量增加，致使河流入境水量急剧减少。1983年引滦入津工程建成通水，天津城市缺水的局面暂时得到缓解，但引滦供水能力有限，供水保证率较低，1997～2000年连续干旱，引滦源头潘家口水库蓄水降至死库容以下。为解决天津城市缺水，2000年再次引黄济津。     

服装低密度聚乙烯热熔胶化学粉碎的研究

服装粘合衬布的生产需要低密度聚乙烯热熔胶的微细粉末,介绍了对该热熔胶的化学粉碎技术所进行的实验研究,表明采用适当的助剂种类和用量以及适宜的工艺过程,通过化学粉碎可以得到合格的粉末产品。