基于均匀化理论的页岩基质流固耦合尺度升级

页岩基质通常由微尺度的有机质和无机质组成,由于这两种介质的力学性质差异较大,且气体在两者中的赋存方式和流动机制均不相同,要准确刻画气体在页岩基质中的流固耦合过程,需针对两种介质建立不同的微尺度模型,但由于计算效率问题,微尺度模型无法直接用于宏观模拟.基于均匀化理论建立一种页岩基质流固耦合尺度升级方法,将微尺度上有机质和...     

二乙二醇甲醚浓度对飞机油箱抗静电涂层的影响

将飞机油箱专用抗静电涂层与不同质量分数二乙二醇甲醚溶液进行浸泡,分析检验涂层在浸泡后的颜色、铅笔硬度、附着力、冲击强度、柔韧性和表面电阻等关键指标的变化情况,用红外光谱、扫描电镜和能谱仪分别检测涂层分子结构、表面形态和元素组成的变化.实验表明:随着二乙二醇甲醚质量分数的不断增加,涂层的力学性能和导静电性能都有不同程度下...     

Sugar-mimicking glycosidase inhibitors: bioactivity and application

A large number of compounds mimicking the structures of monosaccharides or oligosaccharides have been discovered from natural sources. Such sugar mimics inhibit carbohydrate-degrading enzymes because of a structural resemblance to the sugar moiety of the natural substrate. Carbohydrate-degrading enzymes are involved in a wide range of important biological processes, such as intestinal digestion, posttranslational processing of the sugar chain of glycoproteins, their quality control mechanisms, lysosomal catabolism of glycoconjugates, and some viral infections. It has now been realized that inhibitors of the enzymes have enormous therapeutic potential in diabetes and lysosomal storage disorders. In this review, the general bioactivity, current applications, and the prospects for new therapeutic applications are described. Received 27 August 2008; received after revision 08 November 2008; accepted 03 December 2008     

Antizyme inhibitor: mysterious modulator of cell proliferation

In contrast to the considerable interest in the oncogene ornithine decarboxylase (ODC) and in the family of antizymes with regard to cell proliferation and tumorigenesis, the endogenous antizyme inhibitor (AZI) has been less well studied. AZI is highly homologous to the enzyme ODC but does not possess any decarboxylase activity. Elevated ODC activity is associated with most forms of human malignancies. Antizymes bind ODC, inhibit ODC activity and promote the ubiquitin-independent degradation of ODC. Consequently they are proposed as tumor suppressors. In particular, the most studied member of the antizyme family, antizyme 1, has been demonstrated to play a role in tumor suppression. AZI inactivates all members of the antizyme family, reactivates ODC and prevents the proteolytic degradation of ODC, which may suggest a role for AZI in tumor progression. Received 9 December 2005; received after revision 13 April 2006; accepted 1 June 2006     

新型钢筋阻锈剂的作用机理

针对添加阻锈剂后钝化的试件,通过对其钢筋表面、与钢筋距离较近的混凝土薄层和与钢筋距离较远的混凝土薄层的铵含量进行测试,进一步分析了阻绣剂的阻锈作用机理。结果发现,钢筋表面薄层内含有一定量的铵根;距钢筋较近的混凝土薄层含N量比距钢筋较远的混凝土薄层含N量高。由此可以推测阻锈剂含N的极性基团可以吸附在钢筋表面,阻止氯离子等有害离子的侵入,从而阻止和延缓钢筋锈蚀的发生。最主要的原因之一是N的电负性比Cl的大,而N的原子半径比Cl的还要小,在与Cl竞争吸附的过程中,N更容易吸附到钢筋表面,从而阻止氯离子等有害离子的侵入,保护钢筋不被锈蚀。     

油页岩基多联产技术研究

抚顺矿业集团对油页岩进行炼油所采用的工艺为抚顺式干馏工艺。本文简要介绍了该工艺的发展历史,重点介绍了抚顺矿业集团研发出的三种抚顺式干馏工艺的流程、产品及主要技术特点。研究结果表明,抚顺矿业集团对油页岩资源的开发利用已经形成了油、热、电、化工等多联产产业体系。     

盐酸介质中黄铜缓蚀剂H612缓蚀性能研究

采用失重法研究了不同温度下不同质量浓度的H612在10%的盐酸介质中对黄铜的缓蚀作用.结果表明,H612在10%的盐酸介质中对黄铜的腐蚀有良好的抑制作用.采用失重法和SEM分析法评价H612的缓蚀性能,H612是一种性能优良的盐酸黄铜缓蚀剂.     

钼酸钠与羟基羧酸盐对碳钢孔蚀的协同缓蚀作用

本文研究了钼酸钠与酒石酸钠、柠檬酸钠、水杨酸钠、苹果酸钠、葡萄糖酸钠的联合缓蚀作用，结果表明，钼酸钠与羟基羧酸盐对ＮａＣｌ体和涨碳钢的小孔腐蚀具有良好的协同缓蚀效应。