相分离法在核电厂一回路溶解氢测定中的应用

文章建立了用相分离测定反应堆冷却水中溶解氢的方法,该方法以氮气作为载气,通过水样减压、氮气鼓泡,将反应堆冷却水中溶解氢转化到气相中,再用气相色谱测定,间接得出反应堆冷却水中溶解氢的浓度,适用于反应堆水样的分析。     

平山湖井田7-2号煤层厚度变化规律分析

运用趋势面分析、变异系数及可采率指数等数学地质方法对平山湖井田7-2号煤层厚度变化规律进行分析,为以后的矿井生产提供地质依据。     

丽水市食源性疾病调查结果分析

目的初步掌握丽水市食源性疾病的发病及流行趋势,提高食源性疾病的预警与防治能力。方法收集2013年5月—2014年10月食源性疾病哨点医院调查数据,统计分析丽水市食源性疾病流行特征。结果共调查病例3 492例,6~15岁组男性比例是女性的2.85倍,46~55岁组女性是男性的1.56倍。调查病例中,农民最多,儿童次之,分别为1 547例、802例,临床症状除腹泻外,腹痛占62.29%(2 175/3 492),发病主要集中在2013年6月26日~11月16日。儿童发病与就诊平均时间间隔与农民、干部职工、学生、教师差异有统计学意义(P0.05),农民、干部职工、学生、教师差异无统计学意义(P0.05)。216例经实验室确诊,占6.19%(216/3 492),菌株鉴定符合率为50.27%(189/376)。结论食源性疾病调查能够客观地反映丽水市食源性疾病的发生情况,但尚需进一步改进,提升病原溯源能力及鉴定能力。     

向家坝二纵围堰柔性结构段基础施工技术初探

向家坝水电站二期纵向围堰上游段座落于厚达45～62 m的覆盖层上，为提高接头段深厚覆盖层地基承载力，且保证导流期不同江水位时的堰体稳定，优化调整方案为，将接头段和导水段改为柔性结构。详细介绍了柔性结构段基础处理中所涉及的施工程序、施工技术和异常情况处理等。二纵围堰经过了2009年和2010年两个汛期的考验，安全监测显示与实际运行表明，柔性结构体结构稳定。将导水结构堰体改为柔性结构体，不仅节约了投资，而且保证了二期截流工程按施工总进度计划实施。     

Effects of Cooling Rate and Component on the Microstructure and Mechanical Properties of Mg–Zn–Y Alloys

The microstructure and mechanical properties of Mg–6Zn–1Y and Mg–6Zn–3Y(wt%) alloys under different cooling rates were investigated. The results show that the second dendrite arm spacing(SDAS) of Mg–6Zn–1Y and Mg–6Zn–3Y is reduced by 32 and 30% with increasing cooling rates(Rc) from 10.2 to 23 K/s, which can be predicted using a empirical model of SDAS=68 R 0:45:45cand SDAS=73 R 0c, respectively. The compressive strength of both alloys increases with increasing the cooling rate, which is attributed to the increase of volume fraction(Vf) of secondary phases under high cooling rate. The interaction of the cooling rate and component with SDAS has been theoretically analyzed using interdependence theory.     

普旭真空泵在油气回收装置中的应用及维护

介绍了普旭真空泵的工艺作用、结构及工作原理,日常操作维护注意事项、常见故障及排除措施等。及时发现了设备问题,实现了设备的计划维修,使设备能够达到长周期稳定运转的目的。     

Naturally Occurring Polyphenolic Glucosidase Inhibitors

Polyphenols, which are abundantly distributed in plants such as fruits, vegetables, and tea, constitute a large group of aromatic compounds, mainly including phenolic acids and flavonoids. These natural metabolites have been demonstrated to possess a wide range of biological activities associated with health benefits, including the α-glucosidase inhibitory activity. In contrast to the classical α-glucosidase inhibitors, e.g., aza/imino sugars, polyphenols serve as a new type of α-glucosidase inhibitor with different, yet unknown, mechanisms of action, which could lead to novel dietary supplements and therapeutic agents for the prevention and treatment of metabolic disorders. In this review, we report a collection of 137 naturally occurring phenolic acids and flavonoids with α-glucosidase inhibitory activities.