应用高碱值硫化烷基酚钙研制40TBN船用气缸油

介绍了利用新疆中间基础油和兰炼生产的高碱值硫化烷基酚钙为主要清净剂研制４０ＴＢＮ船用气缸油情况。     

钻机顶部驱动电动机的现状与展望

简述了国外钻机顶部驱动系统由直流顶驱逐步演变到变频顶驱的发展历史。结合现有电动顶驱的技术特点,对直流电动机、鼠笼式转子感应电动机、永磁无剧同步电动机和开关磁阻电动机等目前常用和正在开发的几种电动机性能做了分析对比。建议国内研究单位尽快开展开关磁阻电动机驱动方面的资料收集,为新一代顶驱的开发做一些前期工作。     

Recrystallization of YBa2Cu3Ox superconductors in vacuum

YBa₂Cu₃O _x ceramics were recrystallized in vacuum at high temperatures. Recrystallized layers consisting of small grains were observed near the surfaces of the original large-grain 1 2 3 ceramics. The small grains consisted of transformation twins and were identified to orthorhombic 1 2 3 using X-ray diffraction. As vacuum annealing time increased, the thickness of the recrystallized layer increased. The relationship between the thickness and the annealing time showed a linear relationship and an effective diffusion coefficient of 6.25 × 10^–10cm²s^–1. The recrystallized layer showed a critical temperature of 90 K.     

一种用于低频测量的模数转换器

ＡＤ７７１０作为一种信号调节型模数转换器，在低频测量应用中十分理想，在某些应用场合具有不可替代的优势。本文着重对该器件的特性、基本电路以及与８０５１的接口作了介绍。     

Use of a fluorescent radiolabeled triacylglycerol as a substrate for lipoprotein lipase and hepatic triglyceride lipase

A fluorescent radiolabeled triacylglycerol has been synthesized by using a fluorescent fatty acid (pyrene decanoic acid) and a radiolabeled oleic acid. This analog of the natural substrate, 1(3)pyrene decanoic-2,3(1,2)-dioleoyl-sn-glycerol, has been tested as substrate for determining lipoprotein lipase and hepatic triacylglycerol lipase activities in post-heparin plasma. Optimal conditions for the determination of the two post-heparin plasma lipases were similar to those using radiolabeled triolein. Using this substrate, both post-heparin lipases exhibited their characteristic properties (pH optimum and effect of inhibitors) and attacked external ester bonds (1 or 3) containing pyrene decanoic and oleic acids at a similar rate     

用VB6.0实现测漏仪地面系统的软件设计

介绍用VB6．0实现串行通信编程的方法，对采用了RS-232接口的仪器串口读取数据，并将测量数据转存到磁盘上形成数据文件，根据编制的处理系统软件进行数据可视化(图形形式)处理。     

HPLC analysis of quinolinic acid, a NAD biosynthesis intermediate, after fluorescence derivatization in an aqueous matrix

Quinolinic acid (2,3-pyridine dicarboxylic acid), a biological intermediate in nicotinamide adenine dinucleotide (NAD) biosynthesis in microbes and mammals and a brain excitotoxin, is not fluorescent nor electrochemically active and its detection sensitivity by UV absorption is comparatively low. Quinolinic acid was successfully derivatized in water-based samples by monodansylcadaverine, a fluorescence tag, and analysed by high-performance liquid chromatography (HPLC). No extraction procedure was needed and quinolinic acid was activated by water-soluble carbodiimide and derivatized under mild conditions. As little as 3 pmol (500 pg) of quinolinic acid in 5 microliter of artificial cerebrospinal fluid sample volume could be derivatized and detected at a signal to noise ratio of 3:1. Thus, detection on a mass basis by HPLC after fluorescence derivatization is about 300 times as sensitive as direct determination of quinolinic acid by UV absorbance (500 pg vs 150 ng). A variety of activators, fluorescent tags and reaction solvents and conditions were tested but found to be less effective.     

65Nb钢氮离子注入后表面性能研究

通过干涉条纹分析，研究了６５Ｎｂ模具钢经表面Ｎ＾＋注入强化处理后的磨损行为，提出了磨损性能最佳的Ｎ＋注入工艺，该工艺用于６５Ｎｂ模具钢十字头光冲模具，其寿命显著提高。