INTERNET上化学化工资源的检索与利用

介绍了三类重要的网络上化学化工资源检索工具，并对两个重要的化学化工资源站点导航做了简介。同时，简述了INTERNET化学化工资源的利用，如：学术机构、电子杂志、虚拟图书馆、化学数据库、化学教育等。     

小直径芯样在检验结构砼抗压强度中的应用

针对我国现行钻芯法规程中没有对直径小于100mm的小芯样砼强度换算方法作出规定，而实际工程检测中不少结构或构件因钢筋分布十分密集，只能钻取直径小于100m的芯样，为此我们借鉴国外有关标准，并结合工程实测，探讨小直径芯样砼强度试验应注意的问题及其与标准芯样强度之间的换算关系。     

抽拉速率对一种镍基单晶高温合金凝固组织的影响

研究了抽拉速度对一种镍基高温合金DD98凝固组织的影响。结果发现随着抽拉速率的增加，DD98合金由胞状凝固转变为枝状凝固，γ‘相尺寸变小，由不规则形状逐渐变为规则的立方体形状，γ／γ‘共晶的含量逐渐增加，而共晶中的初生γ‘相尺寸逐渐减小。在胞枝晶转变处存在一次枝晶间距最大值。     

Biodegradable blends of poly(butylene adipate-co-terephthalate) and polyglycolic acid with enhanced mechanical,rheological and barrier performances

Blends of poly(butylene adipate-co-terephthalate)/polyglycolic acid (PBAT/PGA) were prepared by melt blending, in which PGA was used as reinforcing component. Impacts of PGA content on tensile property, microstructure, crystallization property, melt viscosity, barrier performance of the blends were researched. Compared with very soft behavior of PBAT, the tensile yield strength and modulus of PBAT/PGA (65/35) sample increased from 7.67, 62.6 MPa of neat PBAT to 12.05, 158.9 MPa, respectively. However, owing to poor PBAT/PGA interface compatibility, its elongation at break decreased significantly from 1082.1% to 88.7%. An epoxy chain extender (ADR) was used as reactive modifier to improve its interface compatibility and rheological property. The related physical properties of PBAT/PGA/ADR (65/35/x) samples with various ADR contents were evaluated in detail. It was found that ADR exerted relatively complex influences on the properties. Overall, compared with neat PBAT and PBAT/PGA (65/35) sample, the PBAT/PGA/ADR (65/35/x) samples exhibited better stiffness-ductility balance and higher processing stability.     

带状镁基牺牲阳极及其应用

采用挤压技术开发了一种带状镁基牺牲阳极产品，已经投入市场，镁带阳性特殊的形状和性能使其在阴极保护工程中有独特的应用，这些应用包括；长输管道，穿越管段，大型贮罐罐底，防雷击用的接地网以及复合阳极中的短期阳极等。     

水玻璃自硬砂铸钢件热裂倾向的研究

在新型改性水玻璃砂造型工艺中，水玻璃加入量为2．5％～3．0％，铸钢件产生热裂倾向。从理论和实践两方面论述铸钢件不产生热裂的原因，为以新型改性水玻璃砂为基础的绿色铸造技术在薄壁铸钢件的应用奠定基础。     

淬火油动态下换热系数的测量及计算

为了测量和计算工业条件下淬火油在不同流速下的换热系数 ,采用超声波多普勒流量计测定了介质的流速 ,用 12 0× 12 0× 2 0 (mm)平板状试样和反传热法测定与计算了换热系数。结果表明 ,换热系数曲线能更好地反映表面热量传递的真实情况 ;随着介质流速的增加 ,换热系数的最大值呈增加趋势 ,当搅拌使介质中产生气泡时 ,介质的换热系数明显降低。     

取证系统中数据恢复关键技术研究

磁盘中已删除文件在未被覆盖之前,其存储方式为连续和离散存储。针对连续存储提出了一种准确匹配已删除文件首簇高16位算法,并重点分析离散存储碎片,提出了一种基于部分匹配预测算法PPMC来重构磁盘上已删除文件碎片的模型。采用PPMC算法确定出任意两个碎片的相邻性概率值,然后再通过剪枝技术,将不可能的分支裁减,逐步加工处理,重构出一个有完整顺序的原文件。     

Synthesis of calcium chloroborate whiskers via sedimentation and sintering process

Single crystalline calcium chloroborate(Ca_2B_5O_9Cl) whiskers with uniform diameter have been fabricated by a two-step process. The precursor was firstly prepared by the sedimentation reaction between CaCl_2, H_3BO_3 and Na OH aqueous solutions, and then sintered at different temperatures for 6 h with KCl as flux. The XRD indicates that the product synthesized at 600 °C is Orthorhombic Ca_2B_5O_9Cl. SEM and TEM results show that the Ca_2B_5O_9Cl is whisker with the diameter about 0.2-0.5 μm and the length up to 15 μm. SAED analysis shows that the whisker is single crystalline and grows along [001] direction. The possible formation process and growth mechanism were proposed.     

An anisotropic constitutive model of geomaterials based on true triaxial testing and its application

Journal of Central South University - Series of testing on coarse grained soils were carried out with a true triaxial testing apparatus. The loads were applied from the major principal and minor...