浅析燕山石化延迟焦化装置腐蚀与防护

针对燕山分公司炼油厂延迟焦化装置因蒸馏装置原料硫含量提高，导致焦化装置的原料含硫量超过设计值，使设备腐蚀加重的情况，分析焦化装置原料含硫量的影响、危害及焦化装置的硫分布，对装置硫腐蚀机理进行分析，并提出防止硫腐蚀危害的对策。     

Electromagnetic Scattering From Objects Above a Rough Surface Using the Method of Moments With Half-Space Green's Function

An efficient approach is proposed to analyze the electromagnetic scattering from objects above a 2-D perfectly electric conducting rough surface. A half-space Green's function with the rough-surface interface is first derived from the Kirchhoff approximation (KA). The method of moments is then applied to analyze the scattering problem of 3-D arbitrarily shaped objects above the rough surface. Since only the objects need to be discretized, the computational time and memory requirement are greatly reduced. The radar cross sections of typical objects above the rough surface have been computed using the proposed method. Numerical results show that the proposed method has good accuracy in the valid range of KA.     

Kinetics of electrochemical process of galena electrode in diethyldithiocarbamate solution

1　ＩＮＴＲＯＤＵＣＴＩＯＮＤｉｅｔｈｙｌｄｉｔｈｉｏｃａｒｂａｍａｔｅ (ＤＤＴＣ)ｉｓｏｎｅｏｆｔｈｅｍｏｓｔｆｒｅｑｕｅｎｔｌｙｕｓｅｄｃｏｌｌｅｃｔｏｒｓｆｏｒｆｌｏｔａｔｉｏｎｏｆｈｅａｖｙ ｍｅｔａｌｓｕｌｆｉｄｅｍｉｎｅｒａｌｓ ,ｓｕｃｈａｓｇａｌｅｎａ ,ｃｈａｌｃｏｐｙｒｉｔｅａｎｄｊａｍｅｓｏｎｉｔｅ ,ａｎｄｉｔｓｈｏｗｓｓｔｒｏｎｇｓｅｌｅｃｔｉｖｉｔｙ[1] .ＷｈｅｎＤＤＴＣｗａｓｕｓｅｄｉｎｈｉｇｈｌｙａｌｋａｌｉｎｅ (ｐＨ >11.4 )ｆｏｒｓｅｐａｒａｔｉｎｇｇａｌｅｎａｆｒｏｍｓ…     

浅谈建筑施工工地的用电安全

从建筑施工工地的外部环境、人员状况、等电位联结状况等。浅述了建筑施工工地存在着电气危险隐患，以及必须采取的用电安全措施。     

Nb对Ni-Cr-Al-Ti系镍基高温合金动态再结晶及热加工延性的影响

本文研究了Nb对Ni—Cr—Al—Ti系镍基高温合金动态再结晶及热加工延性的影响。结果表明Nb促进该合金的动态再结晶和改善其热加工延性。其原因是Nb降低合金的层错能,从而使动态回复速率减慢。     

地下市政管线与行道树相互关系研究

地下管线与行道树根系均需占用地下空间,二者间距过小可能导致管线的损坏及其敷设、维修的不便,同时也会影响行道树的正常生长。通过研究二者相互影响情况,归纳分析国内外相关规范的具体要求,对地下市政管线与行道树的安全距离及安全技术措施提出建议。在满足相关规范的前提下,可以通过合理深埋管线、采取防护措施、优选管材和接口形式等方式解决地下市政管线与行道树的相互影响问题。     

龙井地区河流水文特性分析

文章根据龙井市的地形地势、气候及河流水系等自然地理概况,结合多年水文系列资料,从降水、蒸发、径流、暴雨洪水、泥沙和水质等方面进行了统计计算,分析了各水文要素的变化趋势及区域内的水文特性。     

变捻向钢绳生产

介绍捻向沿绳长交替变化的钢绳———变捻向钢绳的用途、构造、生产设备和捻制方法     

Comparison and evaluation of Chinese research performance in the field of bioinformatics

Bioinformatics is an emerging and rapidly evolving discipline. The bioinformatics literature is growing exponentially. This paper aims to provide an integrated bibliometric study of the knowledge base of Chinese research community, based on the bibliometric information in the field of bioinformatics from SCI-Expanded database during the period of 2000–2005. It is found that China is productive in bioinformatics as far as publication activity in international journals is concerned. For comparative purpose, the results are benchmarked against the findings from five other major nations in the field of bioinformatics: USA, UK, Germany, Japan and India. In terms of collaboration profile, the findings imply that the collaborative scope of China has gradually transcended boundaries of organizations, regions and nations as well. Finally, further analyses on the citation share and some surrogate scientometric indicators show that the publications of Chinese authors suffer from a lowest international visibility among the six countries. Strikingly, Japan has achieved most remarkable impact of publication when compared to research effort devoted to bioinformatics amongst the six countries. The policy implication of the findings lies in that Chinese scientific community needs much work on improving the research impact and pays more attention to strengthening the academic linkages between China and worldwide nations, particularly scientifically advanced countries.