Formation of stable carbonyl oxide by photooxidation of (phenyl)(2-thienyl)diazomethane

Formation of (phenyl)(2-thienyl)carbonyl oxide, which has the longest lifetime among known carbonyl oxides, has been registered by flash photolysis in acetonitrile at room temperature. It is consumed in the pseudomonomolecular reaction with the parent diazo compound. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 666–668, March, 2008.     

抽油井试井微机测控分析仪的研制

本文介绍了一种由8031单片微机与Pc—1500A袖珍式微机系统组成的廉价的油井试井测量、控制、分析仪器的硬件电路及软件结构。这种仪器可望部分取代目前油井试井中普遍使用模拟式回声仪,它提高了自动化程度,增加了数据处理功能。     

Absorption in a LiF-OH−∶F 2 + crystal induced by flash pumping

To whom correspondence should be addressd.     

A new look at multiphase Rachford–Rice equations for negative flashes

The elegant method proposed by Michelsen [M.L. Michelsen, Calculation of multiphase equilibrium, Comput. Chem. Eng. 18 (1994) 545–550] for solving multiphase Rachford–Rice (RR) equations as a bound constrained minimization is extended to the negative flash region; this method is definitely much more robust than any method based on equation solving. The problem is reformulated as an unbounded linearly constrained minimization. The feasible domain is limited by (only few of the) hyperplanes defined by equilibrium constants. The proposed method is applied to several three-phase cases.     

Thermal conductivity and thermal diffusivity of tantalum in the temperature range from 293 to 1800 K

Thermal diffusivity of polycrystalline tantalum at the temperature range from 293 to 1800 K has been measured by the laser flash method with the error of 2–4 %. Thermal conductivity has been calculated with the use of reference data on density and heat capacity. Approximating equations and tables of reference data for the temperature dependence of heat transfer coefficients have been obtained; comparison with the published data has been carried out. The work was financially supported by the Russian Foundation for Basic Research (Grant No. 07-08-00071).     

基于单片机的一款空分设备的电路设计

介绍了一款基于单片机的空分设备的电路设计,详细阐述了该电路各组成部分的工作原理及软件设计,指出该电路具有安全可靠、价格低廉、结构简单等特点。     

流动注射停流光度法联用单片机测定尿液中酪氨酸总量

研究了在硝酸介质中 ,酪氨酸与α 亚硝基 β 萘酚的显色反应。采用流动注射 合并带 停流分光光度法 ,建立了测定人体尿液中酪氨酸总量的新方法。显色产物在 5 2 0nm处有最强吸收。酪氨酸在 0 .2～ 1.0mmol L浓度范围内与信号强度ΔA有较好线性关系 ,回归方程为ΔA =7.5× 10 - 3+0 .7195C(C :单位为mmol L) ,相关系数为r =0 .9981,检出限为 0 .13mmol L。整个测试系统联用单片机 ,使测试过程实现程序化操作。本法已成功地用于人体尿液中酪氨酸的临床检测。     

Intracavity frequency-doubled green vertical external cavity surface emitting laser

An intracavity frequency-doubled vertical external cavity surface emitting laser (VECSEL) with green light is demonstrated. The fundamental frequency laser cavity consists of a distributed Bragg reflector (DBR) of the gain chip and an external mirror. A 12-mW frequency-doubled output has been reached at 540 nm with a nonlinear crystal LBO when the fundamental frequency output is 44 mW at 1080 nm. The frequency doubling efficiency is about 30%.     

基于单片机的步进电机控制系统的设计

介绍了一种基于单片机的步进电机控制系统,该系统采用AT89S52单片机通过8155的14位减法计数器控制步进电机运转,可以在10~4 000 r/min范围内得到精确的转速,并且解决了步进电机升降速过程中的失步和堵转问题.     

High density peptide microarrays. In situ synthesis and applications

The technologies enabling the creation of large scale, miniaturized peptide or protein microarrays are emerging. The focuses of this review are the synthesis and applications of peptide and peptidomimetic microarrays, especially the light directed parallel synthesis of individually addressable high density peptide microarrays using a novel photogenerated reagent chemistry and digital photolithography (Gao et al., 1998, J. Am. Chem. Soc. 120, 12698; Pellois et al. 2002, Nat. Biotechnol. 20, 922). Concepts related to the synthesis are discussed, such as the reactions of photogenerated acids in the deprotection step of peptide synthesis or oligonucleotide synthesis, and the applications of high density peptide chips in antibody binding assays are discussed. Peptide chips provide versatile tools for probing antigen-antibody, protein-protein, peptide-ligand interactions and are basic components for miniaturization, automation, and system integration in research and clinical diagnosis applications.