硫化氢气体对压缩机选材的影响

本文通过分析硫化氢对钢具的腐蚀形式及腐蚀条件,结合相关标准和实践,提出硫化氢气体对压缩机选材的影响及其防腐措施。     

绿色化学与缓蚀阻垢剂的发展

绿色化学是一门全新的从源头上彻底阻止污染的化学,它的影响已迅速扩展到自然科学的各个学科。绿色技术对水处理缓蚀阻垢剂的生产原料、生产方式、反应条件、目标分子等的发展产生了重大的影响,设计出一系列的绿色缓蚀阻垢剂。     

石脑油储罐的腐蚀原因及防护对策研究

通过实地调查、测量和综合分析,对茂民石化乙烯工业公司石脑油储罐的腐蚀状况进行综合研究,并对其腐蚀原因提出了全新的防护理念和对策措施,提高了石脑油储罐的使用寿命,获得较好的社会和经济效益.     

JK508转轮应用于陆水电厂(LS591)水力性能分析

在分析转轮的性能特点及与原运行转轮差别的基础上,就改造后转轮()的水力性能JK508ZZ105LS591进行了详细的分析预估。     

Shear Strength of Reinforced Concrete Beams Under Sea Water

The marine structures such as harbour,pier and inshore concrete terrace are exposed in adverse circumstances in a long period of time . Owing to the attack of external corrosive medium, their safety, durability and reliability decline. Especially the reinforced concrete(RC) structures in the wave splash area are more likely to be subjected to destruction and the loss is vast. Now the safety ,durability and reliability of structure have become increasingly an important subject to be studied. By way of the soaking and drying cycle test on the different mix proportions oblique section of 10 pieces of RC beams suffered artificial sea water(ASW) corrosion under 0,35,70,105,140 times of dry-wet cycles, the compared results of exerting pressure test of these beams under simply supporting were investigated. The law about the changes of the mechanical performance for RC beams with different mix proportions under different time periods for suffering corrosion of dry-wet cycles is as follows: the resistivity to ASW corrosion of the concrete specimens with various water cement ratio(various initial strength) is different ; the characters of oblique section failure for RC beams attacked by sea water are about the same as those for ordinary RC beam; along with the extension of the time for sea water attack, the bearing capacity for oblique section of RC beams varies wave upon wave. The specimens attacked by sea water for about 35 times of corrosion cycle achieve minimum bearing capacity.     

阴极保护原理与新技术

介绍了阴极保护基本理论和发展进程，分析了国内外阴极保护技术的发展现状，归结了国内外阴极保护的标准和规范．     

Hydrolysis of Raw Corn Starch Granules by Glucoamylase and Product Inhibition During the Hydrolysis

Raw corn starch granules were hydrolysized by glucoamylase in a chemostat. The hydrolysis of three different-sized granules shows that smaller granules undergo more hydrolyzation than larger ones. After 78 h, 97% of the granules was hydrolysized with diameter between 0.15 mm and 0.3 mm at 50℃. When corn starch concentration increased from 100 g/L to 250 g/L, the amount of reducing sugar produced was proportional to the initial substrate concentration and no substrate inhibition phenomenon appeared. In order to study the product inhibition exactly, the product from hydrolysis reaction itself was added into the hydrolysis system at the beginning of starch hydrolysis.Product inhibition with different quantities of product added were studied in the initial several hours,during which period enzyme inactivation could be neglected and product inhibition could be studied separately. The experiments indicate that product inhibition happens when the additional quantity exceeds 9.56 g/L.     

Interference and Inhibition in Cognition and Behavior: Unifying Themes for Educational Psychology

In this article, we review modern work on interference and inhibition in cognition and behavior. We begin by briefly reviewing the historical and conceptual roots of this new body of work. Next we discuss five new theoretical frameworks that use the concepts of interference and inhibition to explain cognitive and behavioral phenomena. In the section that follows, we review evidence of individual and developmental differences in inhibition and susceptibility to interference in at-risk students. We then consider the implications of this new body of work for research on educational psychology by discussing six selected areas of research: intelligence, strategies, reading comprehension, logical and mathematical reasoning, self-regulated learning, and retention. In the next section, we explore four critical issues that pose significant challenges to research in inhibition and interference. Finally, we discuss the relevance of this work to educational practice by focusing on its implications for the curriculum and instruction. Throughout, our principal goal is to bring this new body of work to the attention of the readers of this journal and to show how it might be useful in guiding research and theory in educational psychology.     

焊接接头的应力腐蚀开裂及防护

应力腐蚀断裂是焊接结构断裂失效的重要原因之一,这种断裂失效呈脆断特点,易导致灾难性后果.探讨应力腐蚀裂纹的产生、开裂的机理及其影响因素,并提出控制焊接结构发生应力腐蚀断裂的措施.     

Al-Zn合金热浸镀层的电化学腐蚀行为研究

在制备不同配比的热镀Al-Zn合金镀层基础上,于不同介质中测定了有关电化学参数.可知铝含量为5%和55%的两种样品具有良好的耐腐蚀性能,而铝含量为25%的样品防腐蚀性能最差.对所得电化学参数的分析证实了上述差别,说明了耐腐蚀性能与铝含量不成线性关系.