Hélène Metzger: the history of science between the study of mentalities and total history

In this article, I examine the historiographical ideas of the historian of chemistry Hélène Metzger (1886–1944) against the background of the ideas of the members of the groups and institutions in which she worked, including Alexandre Koyré, Gaston Bachelard, Abel Rey, Henri Berr and Lucien Febrve. This article is on two interdependent levels: that of particular institutions and groups in which she worked (the Centre de Synthèse, the International Committee for History of Science, the Institut d'Histoire des Sciences et Techniques (Sorbonne) and the École Pratique des Hautes Études) and that of historiographical ideas. I individuate two particular theoretical aspirations pursued by the historians in Metzger's milieu: the ideal of total history and the study of the human mind. These two objectives were seen by Metzger and many others as implicating each other. Moreover, Metzger and other historians wanted to integrate the practice of commentary of texts in the realisations of those ideals. I argue, however, that these objectives proved very difficult to realise at the same time. One tradition which stemmed out of these discussions, exemplified by Bachelard, Canguilhem and Foucault, focused on the mind and knowledge, and renounced commentary of texts and total history as it was understood by the historians of the Centre de Synthèse. The latter, however, did not really pursue the study of the mind. Moreover, historians like Metzger and Koyré who practised an attentive analysis of texts could not realise total history.     

复合微肥中钼的混合指示剂法测定

研究了混合指示剂法以复合微肥中钼的测定，测定终点颜色变化明显，实验结果表明，标准溶液适宜用量为1－3mL，适用于体系钼含量在1－30mg范围内的样品，该法的精密度和回收率均符合要求，测定结果令人满意。     

双Cox风险模型的破产概率

在假设保单的到达和理赔的发生都为Cox过程,而每份保单的价格和理赔额分别为独立同分布的随机序列时,得出了破产概率的上界,并在两Cox过程简化为两混合Poisson过程时,给出了最终破产概率的明确表达式和更明确的上界.     

智能小车辅助平台的设计与实现

讨论了一种以教学为目的的智能小车开发平台的设计思想,描述了智能小车的机械平台结构,给出了以FreescaleMC9S08GB60为主控芯片的、开放的硬件平台设计,提供了可供用户自行“定制开发设计”的、简单易学的PC方软件平台设计。该辅助开发平台主要针对中小学课外科技活动开发,也可供高校学生进行智能小车设计、参加智能小车设计竞赛之用。     

四种操作系统共存于同一台计算机中的实现

针对很多计算机应用场合 ,要求一台计算机具有多种职能 ,需要多种操作系统支持的需求 ,本文讨论了多种操作系统共存于一台计算机中的技术     

Analysis of intron sequence variability of the conservative HMG-box of Sox9 genes in allotetraploids and their original parents

The Sox genes of allotetraploids and their original maternal red crucian carp (Carassius caassius red var.) and original paternal common carp (Cyprinus carpio L.) were detected by PCR with the designed primers based on the conserved HMG-box sequence in different species. Sequencing of Sox genes indicated that two Sox9 genes (Atsox9a and Atsox9b) existed in allotetraploids, while only one Sox9 gene existed in red crucian carp (Rcsox9a) and common carp (Ccsox9b) . All of the four Sox9 genes contained an intron in the HMG-box. with the sizes of 413 bp, 703 bp, 401 bp and 714 bp, respectively. Moreover, the introns obeyed the rule of "GT-AG" . A high similarity was observed between introns of Atsox9a and Rcsox9a (94.4%), Atsox9b and Ccsox9b (97.8%). Interestingly, the deduced amino acid sequences of their corresponding exons all shared 100% identity. Thus, introns of the HMG-domain of Sox9s in allotetraploids and their original parents have not only the length polymorphism but also intron variability. Our results provide significant molecular evidence for the origin and evolution of allotetraploids.     

基于LPC2214的Flash存储器的应用

介绍了Flash存储器K9F5608U0C和SST39VF160的特性,给出了微处理器LPC2214与它们的硬件连接电路图,以及对它们进行读、写、擦除等操作的应用软件.     

李益首次从军时间地点考辨

本文纠正了长期以来人们对李益首次从军时间和地点的错误认识,认为其首次从军时间应在大历九年至大历十二年间,而非建中初;地点在凤翔节度使李抱玉军中,而非邠宁节度使韩游瑰、凤翔节度使邢君牙或渭北节度使臧希让军中.     

水泥稳定碎石基层施工问题及对策

水泥稳定碎石的施工过程中存在一些问题而影响其使用效果,针对水泥稳定碎石混合料配合比设计、施工拌制、压实、养生等方面存在的问题进行了论述,并提出了解决方法。     

数据库系统的体系结构比较

随着信息技术的不断发展,现代企业和政府的信息化进程不断加快。数据库系统是企业信息、资讯的核心和仓库,是当代计算机系统的重要组成部分,它提供了可靠的存储和高效的查询功能,为企业信息管理与决策提供了稳固的支撑。本文展示了Oracle 9i与SQL Server 2000的体系结构和工作原理,并对其相关功能进行比较。