白炽灯延寿节电开关

运用交流电路中线圈的自感特性，制成一种白炽灯的延寿节电开关，它可消除白炽灯起动瞬间的浪涌电流，延长白炽灯寿命，节约用电。     

浅议科学管理与管理科学

针对“科学管理”与“管理科学”两个概念在应用中常被混为一谈的状况，引经据典对“科学管理”与“管理科学”概念的产生、发展及其内涵进行了阐述，并进一步阐明了两者之间的联系与区别。     

PowerBuilder在C/S模式下的并发控制

并发控制是多用户环境下实现数据共享非常重要的机制,介绍了并发控制的理论及方法,在此基础上讨论了PowerBuilder在多用户时实现并发控制的方法和途径.     

加配重复摆振动周期的变化规律

通过理论推导、研究和分析，得出了加配重复摆振动周期的变化规律．     

海图改正实验的探索

本文介绍了英版航海通告的内容和使用方法,以及如何从网络上下载航海通告及相关查询,阐述了航海通告的处理和海图改正方法.     

Molecular cloning and expression of interleukin Ibeta (IL-1β) from red seabream (Pagrus major)

The interleukin 1β (IL-1β) cDNA was cloned from the red seabream (Pagrus major) by homology cloning strategy. A cDNA fragment was amplified by PCR using two degenerated primers, which were designed according to the conserved regions of other known IL-1β sequences, and elongated by 3' ends and 5' ends RACE PCR to get the full length coding sequence of red seabream IL-1β (RS IL-1β). The sequence contained 1252 nucleotides that included a 5' untranslated region (UTR) of 84bp, a 3' UTR of 410 bp and an open reading frame (ORF) of 759 nucleotides which could be translated into a putative peptide of 253 amino acids with molecular weight of 28.6 kD and putative isoelectric point pI of 5.29. The deduced peptide contained two potential N-glycosylation sites and an identifiable IL1 family signature, but lacked the signal peptide and the clear ICE cut site, which were common in other nonmammalian IL-1β genes. The RS IL-1β had the highest homology with piscine IL-1β according to phylogenetic tree analysis.     

美国对非石油战略的地缘政治透视

冷战时期，非洲由于丰富的自然资源和重要的战略位置成为美苏两个超级大国争夺的重要区域。冷战结束以后，随着前苏联的解体，非洲的战略地位有所下降，美国对非洲的兴趣也日益减弱。但近几年来，美国对非洲的战略开始由冷变热。文章从政治地理角度对美国近年来对非石油战略的转变进行了分析。     

Development of Full Automatic External Welding Machine for Annular Welds of Pipeline

To meet the demands of rapid development of pipeline constructions in China, a complete set of full automatic external welding machine for annular welds of pipeline and welding procedure have been developed thereof. The system has been applied in the “West-East Pipeline Project” and its performance is proven. With this welding machine the welding parameters can be either preset before or adjusted in real time during the welding process, which avoids the blemishes of same type domestic and international products. Thus it is best propitious to in-situ construction conditions and workers‘ technical level in China. In this article the development of mechanical and control systems of this product is introduced and typical welding procedure parameters are provided.     

表面纤维直径与羊毛机织精纺面料的刺痒感

通过前臂试验对26种轻薄型羊毛机织精纺面料和7种其他纤维的轻薄型机织面料的刺痒感进行了比较研究,并用显微镜对部分轻薄型羊毛机织面料的表面纤维分布进行了研究。结果表明多数毛织物在温度为(24±1)℃、相对湿度为(65±5)％的条件下存在刺痒感,并且毛织物的刺痒感与其表面纤维的平面直径及直径大于26μm的表面纤维根数密切相关。