Hardware architectures for the Tate pairing over GF(2)

In this paper two different approaches to the design of a reconfigurable Tate pairing hardware accelerator are presented. The first uses macro components based on a large, fixed number of underlying Galois Field arithmetic units in parallel to minimise the computation time. The second is an area efficient approach based on a small, variable number of underlying components. Both architectures are prototyped on an FPGA. Timing results for each architecture with various different design parameters are presented.     

Recent developments in ghrelin receptor ligands

The 28-amino acid peptide ghrelin is a neuroendocrine hormone synthesized primarily in the stomach. It stimulates growth hormone secretion and appetite, thus promoting food intake and body-weight gain. The pharmacological properties of this peptide are mediated by the growth hormone secretagogue receptor type 1a (GHS-R1a). Given its wide spectrum of biological activities, it is evident that the discovery of ghrelin and its receptor has opened up many perspectives in the fields of neuroendocrine and metabolic research and has had an influence on such fields of internal medicine as gastroenterology, oncology, and cardiology. It is therefore increasingly likely that synthetic, peptidyl, and nonpeptidyl GHS-R1a ligands, acting as agonists, partial agonists, antagonists, or inverse agonists, could have both clinical and therapeutic potential. This review summarizes the various types of GHS-R1a ligands that have been described in the literature and discusses the recent progress made in this research area.     

欧盟化学品分类、标签制度的诠释与研究

欧盟CLP法规是全球第一部基于联合国GHS制度的化学品分类、标签和包装法规,该法规已于2009年1月20日正式生效,并将逐渐取代欧盟指令67/548/EEC和1999/45/EC。CLP法规与REACH法规相辅相成,共同构成了欧盟完整的化学品安全管理法规体系。从3方面对CLP法规进行了研究与论述:CLP法规介绍、CLP法规与GHS制度的对比研究、CLP法规与REACH法规的关系研究。     

化学物质管理法规的国际研究动向

通过研究化学物质管理法规的国际动向,介绍全球化学品统一分类和标签制度(GHS制度)在各国的导入情况。通过比较中国大陆地区与中国台湾地区在GHS制度导入措施上的不同,讨论如何推广GHS制度。通过数据比较来探究GHS分类规则下不同分类的原因,以期提供一个如何通过GHS制度提高化学物质的危害性信息管理的思路。     

高坝洲水电站土石围堰防渗防渗布置与施工

高坝洲水电站土石围堰布置四种防渗形式,分别是柔性混凝土防渗墙、现浇混凝土防渗墙、粘土心墙和土工布。通过对不同类型防渗墙的施工方法的介绍、比较,可供其他工程进行防渗设计及施工参考。     

Environmental and health hazard ranking and assessment of plastic polymers based on chemical composition

Plastics constitute a large material group with a global annual production that has doubled in 15 years (245 million tonnes in 2008). Plastics are present everywhere in society and the environment, especially the marine environment, where large amounts of plastic waste accumulate. The knowledge of human and environmental hazards and risks from chemicals associated with the diversity of plastic products is very limited. Most chemicals used for producing plastic polymers are derived from non-renewable crude oil, and several are hazardous. These may be released during the production, use and disposal of the plastic product. In this study the environmental and health hazards of chemicals used in 55 thermoplastic and thermosetting polymers were identified and compiled. A hazard ranking model was developed for the hazard classes and categories in the EU classification and labelling (CLP) regulation which is based on the UN Globally Harmonized System. The polymers were ranked based on monomer hazard classifications, and initial assessments were made. The polymers that ranked as most hazardous are made of monomers classified as mutagenic and/or carcinogenic (category 1A or 1B). These belong to the polymer families of polyurethanes, polyacrylonitriles, polyvinyl chloride, epoxy resins, and styrenic copolymers. All have a large global annual production (1-37 million tonnes). A considerable number of polymers (31 out of 55) are made of monomers that belong to the two worst of the ranking model's five hazard levels, i.e. levels IV-V. The polymers that are made of level IV monomers and have a large global annual production (1-5 million tonnes) are phenol formaldehyde resins, unsaturated polyesters, polycarbonate, polymethyl methacrylate, and urea-formaldehyde resins. This study has identified hazardous substances used in polymer production for which the risks should be evaluated for decisions on the need for risk reduction measures, substitution, or even phase out.     

如何编写符合GHS的安全技术说明书

安全技术说明书是一份关于化学品燃爆、毒性和环境危害以及安全使用、泄露应急处置、主要理化参数、法律法规等方面信息的综合性文件。GHS是全球化学品统一分类和标签制度的简称,其主要内容是按化学品的物理、健康和环境危害对物质和混合物进行分类,并统一危险标签要素。介绍了GHS版SDS的编写标准、内容、格式和编写要求,举例说明了如何编写SDS中关于GHS方面的内容。     

浅谈实施GHS对化学品管理的影响及对策措施

GHS制度是联合国发布的全球化学品统一分类和标签制度,我国作为国际协议成员国之一,正积极全面推动GHS在国内实施。文章详细阐述了GHS在国内外的实施概况以及实施GHS后对我国化学品管理产生的作用,并就政府职能部门和企业如何实施GHS提出了相应的对策措施。     

染料的危险性分类与标签

本文概述了染料的危险性。依据TDG、GHS和EUCLP的分类与标签规则,分析了染料的危险性分类和标签,同时应用这些规则对染料样品进行了鉴定分类。     

化学品分类和警示将新增一类危险物质:危害臭氧层物质

危害臭氧层物质是指任何被列在《关于消耗臭氧层物质的蒙特利尔议定书》附件中的消耗臭氧层物质或者任何含有一种浓度大于或等于0·1%的消耗臭氧层物质的混合物。介绍了消耗臭氧层物质的危害,阐述了危害臭氧层物质的定义,分析了我国化学品的分类和警示将依据GHS新增一类危害臭氧层物质的必要性,并阐明了危害臭氧层物质的分类和警示。