IBM—PC微型计算机与四极质谱计的联用系统

本文介绍ＩＢＭ－ＰＣ微型计算机与四极质谱计联用系统的硬件配置和软件功能，并 给出了部分数据处理结果。该系统的通用性强，性能价格比高，原则上可与各种国内外 生产的四极质谱计联用，也可以脱机作为普通微机用。     

浅谈地下停车库自动喷水——泡沫联用系统的设计与应用

简要阐述大型地下车库闭式自动喷水—泡沫联用系统的系统组成和工作原理,同时介绍相关系统设计应注意的问题,并结合某大型地下车库闭式自动喷水—泡沫联用系统的设计计算与优化进行案例分析。     

裂解-气相色谱-质谱联用技术研究丙烯酸酯类聚合物热解机理

裂解气相色谱(PY-GC)是研究高聚物的主要手段之一,当它与质谱结合组成裂解-气相色谱-质谱联用技术(PY-GC-MS),可直接鉴定裂解产物,对于研究聚合物组成、结构及热降解机理十分有效。本文利用居里点裂解器与色质联用仪组成PY-GC-MS直接联用系统,对于二种丙烯酸酯类均聚物和共聚物进行了研究,鉴定了聚合物主要裂解产物,并据此探讨了热解机理以及共聚物与共混物的差异。研究结果表明PY-GC-MS联用技术是研究聚合物的有效方法。     

SNCR与烟道式SCR联用于小型燃煤机组脱硝的研究

经过研究提出了燃煤电厂SNCR与烟道式SCR联用布置方式的适用范围,并通过和SNCR与具有独立反应器SCR联用的性能及经济比较,提出了烟道式SCR布置方式的优势;另外,从SNCR与烟道式SCR联用的实际工程应用证明了此种布置方式的可行性及其推广意义。     

策划药物MDPV的检验

本文建立了策划药物亚甲基二氧吡咯戊酮(MDPV)的气相色谱-质谱(GC-MS)联用、液相色谱-质谱(LCMS)联用分析方法。利用GC-MS联用、LC-MS联用分析技术对MDPV进行分析,得到MDPV的GC-MS分析主要特征离子及LC-MS联用分析分子离子峰、二级质谱碎片峰、三级质谱碎片峰,并对各特征离子及碎片峰进行了归属研究,得到了MDPV的GC-MS联用、LC-MS联用分析的质谱裂解规律及特征离子。     

废品桶爆炸原因分析

本文用红外光谱和气相色谱-质谱联用技术分析了废品桶内残留物,确定了废品桶气割时发生爆炸的原因。     

SiC纤维/LAS复合材料的TG-DTA-MS研究

本文首次用TG-DTA-MS联用技术对SiC纤维/LAS微晶玻璃复合材料的热分解过程、机制及其与晶化的关系进行了研究。提出了该复合材料界面形成碳层的热力学和质谱分析判别依据,并对晶化前后的复合材料的热分解行为作了实验对比和理论分析。      

溶胶-凝胶法制备连续莫来石纤维先驱凝胶DSC-TG-MS分析

以正硅酸乙酯(TEOS)、异丙醇铝(AIP)和硝酸铝(AN)等为原料,用溶胶-凝胶(sol-gel)法制备连续莫来石纤维.利用热分析与质谱联用(DSC-TG-MS)分析研究了莫来石纤维先驱凝胶在热处理过程中的化学反应、物相变化.     

化学发光免疫成像分析法初探

随着化学发光免疫分析方法的日趋成熟,各种技术与化学发光免疫分析的联用成为一种发展趋势。本文介绍了化学发光免疫分析主要类型及化学发光免疫分析联用技术,重点对化学发光免疫成像进行了分析和研究。     

石油醚对乳化炸药基质热分解动力学的影响

采用TG-DSC联用技术对混有石油醚的乳化基质样品的热分解动力学进行了研究,用Ozawa法和Satava-Sestak法对试验数据进行处理,得到各样品的动力学参数和机理函数.讨论了混入石油醚后乳化基质热分解动力学参数变化的原因,认为石油醚的加入会改变乳化基质的热分解动力学行为,具有促进乳化基质热分解的趋势.     

反相高效液相色谱法同时测定洁康舒洗剂中三组分的含量

建立反相高效液相色谱法同时测定洁康舒洗剂中大黄酸、大黄素和大黄酚含量的方法。采用反相高效液相色谱法。symmctry C18柱(3.9×150mm,5μm)流动相为甲醇—水—磷酸(80:20:0.1);流速为1.0mL·min-1;检测波长为432nm。大黄酸、大黄素和大黄酚的回归方程分别为:C1=7.3159×10-1+1.8966×10-5A,r=9994,C2=1.0513+1.5680×10-5A,r=0.9999C3=1.2260-1.4684×10-5A,r=0.9999三者分别在7.60~38.0μg·mL-1、1.75~8.75μg·mL-1、2.4~12.OOμg·mL-1范围内呈线性关系。平均回收率和RSD分别为98.02%、96.63%、97.05%和1.78%、1.20%、1.15%。该方法操作简便,测定结果准确可靠,可用于测定洁康舒洗剂中大黄酸、大黄素和大黄酚的含量。     

Systematic separation of a multicomponent mixture of solids based on selective crystallization and dissolution

A cascade process for the separation of a multicomponent mixture of solid particles based only on solubility is disclosed. It consists of two subprocesses: One is made up of a dissolver-filter-crystallizer-filter train, and the other is made up of the same plus an evaporator. While the former is a well-established technology, the latter is not a commercial one. Discussion of how and why the subprocesses work for two-component systems is first given. Then, a step-by-step procedure for the design of a cascade process for a multicomponent system is presented. In addition, other issues of relevance to the conceptual design of processes—choice of solvent, choice of operating temperatures, selection of the separation sequence, operability issues—are considered.     

钠镁铝硅系统微晶玻璃的分相成核行为

本文以20Na2O、4CaO、12MgO、22Al2O3、4TiO2、38SiO2(重量百分比)组成玻璃为基础,制备了具有快速微晶化特性的钠镁铝硅系统微晶玻璃。分别采用差热分析技术(DTA)、X射线衍射技术(XRD)研究了不同热处理条件下玻璃分相成核的动力学、热力学和它们之间的依存关系。玻璃分相成核最大速率时的温度接近于923K。在成核温度的热处理对分相的放热行为有影响,成核导致系统自由能的降低与分相峰面积和峰值温度变化有关。用差热分析仪测量的玻璃分相的放热效应,是快速微晶化玻璃的重要特征,用XRD证实分相放热过程中没有微晶相产生。玻璃的分相过程为成核生长机理,采用修正kissinger方程求得玻璃分相活化能为310.445KJ/mol。     

A high-efficiency cross-flow micronebulizer interface for capillary electrophoresis and inductively coupled plasma mass spectrometry.

A pneumatic nebulizer interface for capillary electrophoresis (CE) and inductively coupled plasma mass spectrometry (ICPMS) is reported. The interface is constructed using a high-efficiency cross-flow micronebulizer (HECFMN) and has the following features. (1) Makeup solutions can be fed to the interface by nebulizer self-aspiration and liquid gravity pressurization. (2) The liquid dead volume of the interface is approximately 65 nL, much smaller than those (200-2500 nL) reported for other interfaces. (3) The interface can be stably operated at a liquid flow rate down to 5 microL/min with a high analyte transport efficiency up to 95% to the plasma and (4) does not induce noticeable laminar flow in the CE capillary at typical nebulizer gas flow rates of 0.8-1.2 L/min. Because of these features, baseline resolution of 10 lanthanides with a CE-ICPMS system using the HECFMN interface is achieved, and detection limits and peak asymmetry are 0.05-1 microg/L and 0.93-1.23, respectively, improved significantly over those reported previously for a CE-ICPMS system using a high-efficiency nebulizer interface. Peak precision for the 10 lanthanides is in the range of 6.2-12.3% RSD (N = 5). Peak widths are from 9.1 s for 139La to 17.9 s for 175Lu. The effects of nebulizer gas flow rate, makeup solution flow rate, and spray chamber volume on CE-ICPMS signal intensity and separation are also evaluated for the HECFMN interface by the separation of Cr3+ and Cr2O7(2-).     

基于无纸记录仪的变压器变压法真空干燥状态监控系统

基于PLC或"PLC+上位机"电力变压器变压法真空干燥状态监控系统,硬件系统相对复杂,需要A/D转换和人机界面组态。监控系统改用"PLC+无纸记录仪",硬件系统大大简化,无需计算机、A/D转换和人机界面组态;在干燥系统罗茨泵的两端并联一旁路阀,降低了罗茨泵的故障率,干燥周期缩短10%~30%,能耗降低1O%~25%,综合生产能力提高15%~25%。     

Axial interface optical phonon modes in a double-nanoshell system

Within the framework of the dielectric continuum (DC) model, we analyze the axial interface optical phonon modes in a double system of nanoshells. This system is constituted by two identical equidistant nanoshells which are embedded in an insulating medium. To illustrate our results, typical II-VI semiconductors are used as constitutive polar materials of the nanoshells. Resolution of Laplace's equation in bispherical coordinates for the potentials derived from the interface vibration modes is made. By imposing the usual electrostatic boundary conditions at the surfaces of the two-nanoshell system, recursion relations for the coefficients appearing in the potentials are obtained, which entails infinite matrices. The problem of deriving the interface frequencies is reduced to the eigenvalue problem on infinite matrices. A truncating method for these matrices is used to obtain the interface phonon branches. Dependences of the interface frequencies on the ratio of inter-nanoshell separation to core size are obtained for different systems with several values of nanoshell interdistance. Effects due to the change of shell and embedding materials are also investigated in interface phonon modes.     

Al2O3系纳米固溶体粉末晶格常数与成分关系的理论和实验研究

氧化物固溶体晶格常数的变化是影响材料制备和应用的一个重要因素,从理论上预测氧化物固溶体晶格常数的变化规律是材料学家常用的从理论上研究物性参数的方法之一。我们推导出立方相氧化铝系纳米固溶体晶格常数与组成固溶体的氧化物的成分的关系,并用于Al2O3—MgO、Al2O3—Y2O3和Al2O3-MgO-Y2O3系纳米固溶体晶格常数的计算,发现和用湿化学方法制备的立方相氧化铝系纳米固溶体晶格常数实测的结果基本一致,误差分别不大于3．35％、1．25％和1．22％。     

ICP—AES法测定稀土—铁—镁合金的成分

本文叙述了用 ICP—AES 法同时测定稀土—铁—镁合金中各元素含量。研究了高含量Fe 对其他元素测定的影响。三个标样的测定结果表明该方法是准确可靠的。     

COMPLEX STRESS INTENSITY FACTORS FOR A CRACK IN A BIMATERIAL BRAZILIAN TEST SPECIMEN

Abstract— The stress field in front of a crack tip lying in a plane bimaterial interface is always of a complex nature. The stress intensity factor characterising its asymptotic variation is therefore a complex number and its assessment from a numerical calculation requires the separation of the particular loading modes by an appropriate method. A suitable method is provided by the combination of curve integrals and an auxiliary singular field, enabling this separation by means of simple post-processing. This method can also be applied to the separation of load modes in front of the crack tip in a homogeneous specimen exposed to a mixed-mode load.     

Development of a poly(dimethylsiloxane) interface for on-line capillary column liquid chromatography-capillary electrophoresis coupled to sheathless electrospray ionization time-of-flight mass spectrometry

An interface in elastomeric poly(dimethylsiloxane) (PDMS) for on-line orthogonal coupling of packed capillary liquid chromatography (LC) (i.d. = 0.2 mm) with capillary electrophoresis (CE) in combination with sheathless electrospray ionization (ESI) time-of-flight mass spectrometric (TOFMS) detection is presented. The new interface has a two-level design, which in combination with a continuous CE electrolyte flow through the interface provides integrity of the LC effluent and the CE separation until an injection is desired. The transparent and flexible PDMS material was found to have a number of advantages when combined with fused silica column technology, including ease to follow the process and ease to exchange columns. By combining conventional microscale systems of LC, CE, and ESI-MS, respectively, the time scales of the individual dimensions were harmonized for optimal peak capacity per unit time. The performance of the LC-CE-TOFMS system was evaluated using peptides as model substances. A S/N of about 330 was achieved for leucine-enkephaline from a 0.5 microL LC injection of 25 microg/mL peptide standard.