BAIRD Ps-6真空型电感耦合等离子发射光谱仪的故障分析与对策

对Ｐｓ－６型光谱仪作了简介的基础上，从联锁保护电路入手，选择了射频发生器。相检测电路，气路，真空系统，光路准直监视系统，光电倍增管和高压电路等八例有代表性，。已排除的故障实例深入进行了研究，提出了排除故障的思路与办法。     

H-800型电镜真空系统故障部位判定和维修

本文将“故障要因图”法应用于电镜真空系统的维修中，作出了H-800型透射电镜真空系统的故障要因图，并依据这一要因图对H-800型电镜真空系统的实际故障进行分析，比较准确地判定了故障部位，指出利用故障要因图分析和查找电镜真空系统故障的部位和原因能取得好的效果。     

DV4/5真空直读光谱仪光学系统的检修和调试

涟源钢铁集团有限公司作为美国 BAIRD公司生产的 DV4/5真空直读光谱仪在中国较早的用户 ,拥有该公司四台真空直读光谱仪。这些仪器或迟或早地发生过光学系统故障 ,本文介绍处理这些故障的经验。1　光学系统的组成及控制与联锁1 .1　组成DV4/5真空直读光谱仪光学系统由光源、汞灯反射镜、凹面反射镜、入射狭缝、凹面光栅、罗兰盘及光检测器光电倍增管 (PMT)等部件组成 ,其结构 [1]见图 1。图 1　光学结构图1 .2　控制及联锁当启动分析键 F1 0后进入曝光阶段时 ,从CMU- 1 6读出系统的 SC板上 (DV4型 )或 MC2 0的CPU板上 (DV5型 )发…     

高精度四极质谱检测限测试和影响因素分析

高精度四极质谱仪(QMS)的气体分压精确测量功能与其使用方法关系密切.采用包含有四极质谱仪、真空系统和进样系统的质谱参数测试装置,针对工作及系统参数对质谱测试结果的影响开展研究.试验结果表明:无论是扫描速率、质量数分辨率、电压和探测器等质谱工作参数,还是真空本底、工作真空和气体种类等系统参数都会对质谱测试结果尤其检测限产生一定影响.试验获得了特定条件下的最优参数并进行比较.采用获得的最优参数组合,通过测量空气中极低含量稀有氪气和氙气的同位素谱图,可获得一定条件下法拉第杯(FC)、二次电子倍增器(SEM)和离子计数器(CP)等3种探测器的最小可检浓度,分别为17.3×10-9、0.34×10-9和0.15×10-9.其中SEM和CP的检测限最低,适合用于微量气体分析.     

BAIRD Ps-6电感耦合等离子发射光谱仪RF发生器的故障分析与检修

在对RF(射频)发生器作简介的基础上，从联锁保护电路入手，选择了RF发生器不能进入点火前的准备状态、无输出功率、输出负载过重、不能形成等离子火炬、点不着火、自动调谐时点火困难和严重超载出现过热等七例有代表性的、已排除了的故障实例深入进行分析研究，提出了排除故障的思路与办法。     

Digisorb 2600型物理吸附仪真空系统检漏、故障分析及对策

就Ｄｉｇｉｓｏｒｂ２６００型物理吸附仪的真空系统拟出了表格形式的基本检漏步骤，并在此基础上详细介绍了几例特殊真空故障的查找，分析及解决方法。     

理学D/MAX—1400全自动X射线衍射仪真空及其控制电路故障部位判定和排除

在简要介绍真空控制流程图的基础上,选择了TMP轴承受损、TMP叶轮打烂、电路参数改变TMP加速过快OLL报警烧保险、转靶磁密封不良VAC1报警、供电缺相过流保护和真空控制放大器自激离子规衰老等6个有代表性的、已排除的故障实例进行深入分析研究,提出了排除故障的思路和方法。     

SP3420型气相色谱仪常见故障分析及处理

SP3420型气相色谱仪主要包括两个系统,即气路系统和电路系统。气路系统主要有进样器、载气过滤器、色谱柱、压力表、TCD检测器等;电路系统包括各部件的稳压电源、温控装置、外部事件控制继电器、BF9202数据处理工作站等。判断气相色谱仪的故障特征,就要熟悉色谱仪的工作原理,以及气路和电路这两大系统,特别是构成这两个系统部件的结构和功能,熟悉主机线路图和各系统的原理。搞清楚控制单元和被控对象之间的关系,各连接插接件引线的编号和去向,仔细检查电路板,寻找故障点。色谱故障的排除既要做到局部又要考虑到整体,逐步排除产生故障的原因,把故障范围缩小。一般采用排除法,可以缩小故障检修范围,达到事半功倍的效果。     

色质联用仪真空系统维护经验点滴

叙述了大型精密色质联用仪高真空系统在日常工作中的维护和维修以及出现的部分故障与排除方法。     

用气相色谱仪测定变压器油中气体

本文采用多柱自动切换气相色谱仪和真空全脱气装置对变压器和互感器用油中的气体进行了系统的分析，除可测定油中的氢、甲烷、乙炔、乙烯、乙烷、二氧化碳和一氧化碳等气体外，还可根据不同需要测定氮、氧以及Ｃ３和Ｃ４烃的含量。本方法已用于诊断变压器和互感器内部变化及故障。     

Review of Analytical Methods for Atmospheric Oxidants Measurements

Abstract

Instrumental and manual methods currently available for the measurement of atmospheric oxidants are surveyed. Techniques used in the United States are emphasized and their advantages and disadvantages are discussed. Commercial systems are evaluated in terms of general operating principles rather than of specific instruments. The ability of these techniques to meet the measurement requirements defined by U.S. Federal air quality oxidant criteria are discussed. Alternative chemical techniques that may have some advantages over the neutral, buffered KI procedure are discussed. Also some attractive, alternative instrumental procedures that are ozone-specific are presented. These systems are based on chemiluminescence and ultraviolet absorption photometry. Electrochemical and colorimetric methods for total oxidant measurements are compared. Finally, some data are presented on relationships of ozone and total oxidants.     

A study of mica structure and strength properties of polymer materials based on it

The mica microstructure is studied, and its shape and particle sizes are found as dependent on coating technology. Using epoxy and organosilicon polymers, several lots of materials with different contents of mica are prepared and mechanical tests are performed. The optimal amounts of mica wherein the initial strength characteristics are preserved are found. The thicknesses of epoxy and organosilicon polymer wherein high optical decorative properties of mica are preserved are determined.     

On topological and geometrical distance matrices

Differences between topological and geometrical distance matrices are examined. Some examples of geometrical distances when graphs are embedded in spaces of different dimensions are given. Relations of topological distance matrices to other graph matrices are shown. The topological distance matrices are defined in the Hilbert space and their elements are distances through the graph lattices.     

Densities,speeds of sound,excess volumes and viscosities of binary mixtures of mtbe with tetralin and decalin at 303.15 k

Measurements of densities, speeds of sound, excess volumes and viscosities of binary mixture of methyl tert-butyl ether with tetralin and decalin are reported at 303.15?K over the entire range of composition. Excess volumes are measured using batch dilatometer technique. Sound speeds are obtained using ultrasonic interferometer. Densities are computed from excess volume data. Isentropic compressibilities are derived from density and sound speed data. Speeds of sound are evaluated on the basis of Jacobson's free length theory and Schaff's collision factor theory. The predicted values are in good agreement with the experimental results. The viscosity data are analysed on the basis of corresponding states approach. Excess volumes and deviation in isentropic compressibilities are negative and deviation in viscosities are positive over the entire composition range. The experimental results are discussed in terms of possible molecular interactions between unlike molecules.     

Fluorescence imaging and point measurements of tissue: applications to the demarcation of malignant tumors and atherosclerotic lesions from normal tissue

The possibilities of using laser-induced fluorescence for tissue diagnostics are discussed. The tissue types investigated are malignant tumors and atherosclerotic lesions. Studies with natural autofluorescence as well as with fluorescent tumor markers are included in this paper. Fluorescence emission and decay data are presented for some tissue chromophores contributing to tissue autofluorescence. Optical spectroscopic characteristics of fluorescent malignant tumor markers are analyzed and instrumental designs for clinical applications are discussed. Images recorded with a multicolor fluorescence imaging system developed in Lund are presented.     

Field Effects in Nematic Liquid Crystals in Terms of Catastrophe Theory

The field effects in nematic liquid crystal layers are reanalysed using catastrophe theory. The layer with pretilted director orientation and obliquely applied magnetic field, the hybrid aligned nematic cell and twisted nematic structures are considered. The stable solutions are identified and transitions between them are specified. The results are in essential agreement with previous work. Some details concerning the behaviour near the threshold are revealed.     

A perturbative calculation of the rovibrational energy levels of methane

The rovibrational energy levels of methane are determined from a quartic ab initio potential energy force field where the expansion coordinates are the Morse coordinates for the stretches and extension coordinates for the bends. Energies are calculated using canonical Van Vleck perturbation theory. Results are obtained for both rotation-vibration Hamiltonians expressed as functions of curvilinear and rectilinear normal coordinates. Second, fourth, and sixth order curvilinear results are compared with experimental results, and fourth order results for the rectilinear and curvilinear Hamiltonian are compared to each other. The calculated rovibrational levels are in good agreement with the experimental values for low J levels. The calculated rotational level splittings are in even better agreement with the experiment. In particular, the ground state tetrahedral splittings, which are as small as 10(-4) cm(-1), are well reproduced by our calculations at sixth order.     

叠氮二异丁基铝的构造及其缔合-解离平衡研究

叠氮二异丁基铝（DBAA）是一个新合成的化合物。通过相对分子质量的测定、氢－核磁共振谱和铝－核磁共振谱的测定,确定了DBAA三聚体的分子构造;在溶液中研究了DBAA的三聚体和单晶体之间的缔合－解离平衡。这个平衡受溶剂性质、温度的影响。借助铝－核磁共振谱和相对分子质量的测定计算了DBAA三聚体的解离平衡常数、解离焓和解离熵等热力学数据。     

Spot-test detection of aryl hydrazines, hydrazones, osazones, oximes and aromatic amines

Arylhydrazines are detected by oxidation with N-bromosuccinimide and coupling with resorcinol to form azo-dyes which are intensely coloured in alkaline media. Hydrazones and osazones are hydrolysed to form the arylhydrazines, which are then tested for 4-Nitro- and 2,4-dinitrophenylhydrazines are tested for by forming their hydrazone with salicylaldehyde and adding alkali to produce a violet colour. The hydroxylamine formed by the hydrolysis of oximes is oxidized by iodine monochloride in the presence of sulphanilic acid; coupling with 8-hydroxyquinoline forms a dye that is red in alkali. Intense colours are immediately produced when primary, secondary and tertiary aromatic amines are mixed with diacetoxyiodobenzene. All the tests are sensitive and appear to be specific.     

若干含多硫基的配合物的合成方法及结构特征

本文综述了近年来我们合成的十二种多硫基的配合物，这些配合物含有Ｓ＾２－２，Ｓ＾２－４，Ｓ＾２－５，Ｓ＾２－６，Ｓ＾２－７等多硫革配体，总结了这些配合物中的金属配位构型，比较了各种多硫基的Ｓ－Ｓ键长及有关键角，归纳了配合物外光谱，并阐述了其中几个配合物与ＮＨ２ＮＨ２的反应性能。