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简要介绍了一种基于GEM(Gas Electron Multiplier气体电子倍增器)的、用于对中子束进行实时监测的中子束线监测器GEM Monitor,重点介绍了其中电子学部分的设计,包括电路工作原理、系统结构、子板设计及Monitor母板FPGA逻辑及其算法的实现。最后给出了相关测试结果。 相似文献
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An Acacia victoriae trypsin inhibitor (AvTI) was purified from the seeds of prickly wattle (A. victoriae Bentham) by salt precipitation, ion-exchange and gel filtration chromatography, and its degree of glycosylation, amino acid composition, and kinetic properties were determined. Gel electrophoresis revealed at least four glycoprotein bands in the crude extract, salt-precipitated and ion-exchange protein fractions, while the purified AvTI showed only one band and a degree of glycosylation of 2.06%. Glutamate (13.3%), aspartate (10.3%), leucine (7.62%) and lysine (7.01%) were the major amino acids in AvTI while the contents of sulphur-containing amino acids, cysteine (1.38%) and methionine (0.75%), as well as of tryptophan (1.17%) were low. Its dissociation constant (Ki) for the inhibition of bovine trypsin was found to be 1.06 × 10−8 M, indicating a high affinity between AvTI and this enzyme, and its role as a competitive inhibitor was confirmed by a double reciprocal plot. These results complement our earlier studies which indicated the presence of three isoforms of this Kunitz-type trypsin inhibitor in prickly wattle seed. 相似文献
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目的:开发HPLC-ESI-MS/MS方法测定大鼠组织对氨基水杨酸浓度以改善以往方法的复杂前处理过程及低灵敏度的问题,并应用于研究其在大鼠体内的分布。方法: 采用一步蛋白沉淀的前处理,选择菲诺门Synergi 4u Polar-RP 80A (150 mm×4.6 mm;4 μm)色谱柱以及梯度法进行色谱分离。内标为氯唑沙宗。采用API4000液相色谱串联质谱(LC-MS/MS)法测定。扫描方式采用多重反应监测(MRM),负离子模式。对氨基水杨酸及内标(氯唑沙宗)监测离子对为m/z 152.0→108.1,m/z 167.9→131.9。 结果:总分析运行时间为6.5 min。对氨基水杨酸在0.05~50 μg/mL内线性关系良好,定量下限低至0.05 μg/mL。本实验方法学所有验证结果都符合FDA生物样品分析指导原则要求。结论:本分析方法准确可靠,并成功应用于临床前组织分布研究。 相似文献
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Elizabeth daCostaMattos EnzioD. Moreira MiltonF. Diniz RitaC.L. Dutra Gilson daSilva Koshun Iha Ulrich Teipel 《Propellants, Explosives, Pyrotechnics》2008,33(1):44-50
Fourier transform‐infrared spectroscopy (FT‐IR) in transmission and photoacoustic detection (PAS) techniques have been used for the characterization of polymeric coating of cyclotrimethylenetrinitramine (RDX) using a fluoroelastomer (Viton®). Although the bands of the polymer were indicated by two different techniques, the transmission (casting film) showed better evidence of absorption of fluoroelastomer for the polymer coating of the energetic material. Also attenuated total reflectance (ATR), another FT‐IR technique, has been used to analyze a cyclotetramethylenetetramine (HMX)/Viton system for the characterization of Viton bands and it showed excellent results without sample preparation. 相似文献
67.
E. Meslin M. Lambrecht F. Bergner P. Pareige A. Barbu A. Ulbricht 《Journal of Nuclear Materials》2010,406(1):73-116
Understanding the behavior of reactor pressure vessel (RPV) steels under irradiation is a mandatory task that has to be elucidated in order to be able to operate safely a nuclear power plant or to extend its lifetime. To build up predictive tools, a substantial experimental data base is needed at the nanometre scale to extract quantitative information on neutron-irradiated materials and to validate the theoretical models. To reach this experimental goal, ferritic model alloys and French RPV steel were neutron irradiated in a test reactor at an irradiation flux of 9 × 1017 nm−2 s, doses from 0.18 to 1.3 × 1024 nm−2 and 300 °C. The main goal of this paper is to report the characterization of the radiation-induced microstructural change in the materials by using the state-of-the-art of characterization techniques available in Europe at the nanometre scale. Possibilities, limitations and complementarities of the techniques to each other are highlighted. 相似文献
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阐述了哈尔滨地区电网调度技术的现状,结合电力系统的发展及电力体制的深化改革,分析了电网调度在新时期下的新内容,展望了哈尔滨地区电网调度技术的现代化进程。 相似文献
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无线市话PHS的组网技术 总被引:1,自引:0,他引:1
文章详细介绍了我国现有的个人接口系统(PAS,Personal Access System)、基于IP的PAS系统(iPAS,IP—based PAS)、中兴个人通信系统(ZXPCS,Zhong Xing Personal Communication System)三种主要小灵通系统核心网络的组网技术。讨论了它们各自的技术特点优势和演进过程,同时对PHS在电力专网中的无线接入和厂矿企业的区域应用前景进行了简要的分析。 相似文献