分析测试中心面临的挑战

在总结中国科学院所属的分析测试中心的工作任务和所起的作用之后，对分析测试中心的发展趋势做了评述；分析了中科院所属分析测试中心在目前处于困境的根源，对中心今后的工作方向和如何能走出困境，更好地为科研和生产服务提出了建议和看法     

华东地区分析测试中心座谈会在上海召开

为了更好地了解分析测试中心的发展情况,使分析测试中心的建设更好地适应科学技术和国民经济发展的需要,国家科委条件财务局委托上海市科委于五月下旬在上海召开华东地     

分析测试中心的定量评价方法

近年来,全国各部门,各地方的各级分析测试中心得到了较快的发展。分析测试中心和大型精密仪器的管理问题也引起了各方面的重视。有人提出了大型仪器使用效益综合评价的数学模式。对分析测试中心,虽有一些很好的管理文章报道,但还是定性的方法研究和经验     

《分析测试技术与仪器》征稿简章

《分析测试技术与仪器》是经国家科委批准向国内外公开发行的技术性季刊(刊号:ISSN 1006-3757,CN 62-1123/O6),由中国科学院综合计划局、中国科学院兰州分院分析测试中心和中国科学院兰州化学物理研究所主办.《分析测试技术与仪器》创办于1992年,在当时填补了中国科学院技术期刊的空白.10余年来,它担负着技术传播、交流、研讨及学科发展的导向作用,始终以繁荣分析测试科学为己任,得到了全国科研、高校、厂矿、企事业单位广大科技工作者的厚爱.1办刊宗旨及特色本刊的服务对象主要是在科研、教育系统隶属的分析测试中心、开放实验室、各行…     

《分析测试技术与仪器》征稿简章

《分析测试技术与仪器》是经国家科委批准向国内外公开发行的技术性季刊(刊号:ISSN 1006-3757,CN 62-1123/O6),由中国科学院综合计划局、中国科学院兰州分院分析测试中心和中国科学院兰州化学物理研究所主办.《分析测试技术与仪器》创办于1992年,在当时填补了中国科学院技术期刊的空白.10余年来,它担负着技术传播、交流、研讨及学科发展的导向作用,始终以繁荣分析测试科学为己任,得到了全国科研、高校、厂矿、企事业单位广大科技工作者的厚爱.1办刊宗旨及特色本刊的服务对象主要是在科研、教育系统隶属的分析测试中心、开放实验室、各行…     

《分析测试技术与仪器》征稿简章

《分析测试技术与仪器》是经国家科委批准向国内外公开发行的技术性季刊(刊号:ISSN 1006-3757,CN 62-1123/O6),由中国科学院综合计划局、中国科学院兰州分院分析测试中心和中国科学院兰州化学物理研究所主办.《分析测试技术与仪器》创办于1992年,在当时填补了中国科学院技术期刊的空白.10余年来,它担负着技术传播、交流、研讨及学科发展的导向作用,始终以繁荣分析测试科学为己任,得到了全国科研、高校、厂矿、企事业单位广大科技工作者的厚爱.1办刊宗旨及特色本刊的服务对象主要是在科研、教育系统隶属的分析测试中心、开放实验室、各行…     

对发展分析测试中心的几点设想

贯彻赵紫阳总理的指示精神,尽快建成分析测试中心,使之为生产、科研和社会进步服务,这是摆在我们面前的一项重要任务。为此,提出以下几点有关发展分析测试中心的设想。     

关于召开《分析测试技术与仪器》第四届编委会暨专题研讨会的通知

院属各单位及编委 :“分析测试技术与仪器”将于 2 0 0 2年 9月迎接她创刊 10周年华诞 .经我局与中国科学院兰州分院分析测试中心和兰州化学物理研究所研究决定 ,拟于 2 0 0 2年 9月在甘肃省兰州市召开第四届编委会暨专题研讨会 ,现将有关事宜通知如下 :一 .　研讨专题 :1.如何将《分析测试技术与仪器》办成读者认可的精品期刊 .2 .在目前的政策导向下 ,为“技术性”期刊走出困境提出对策和建议 .3.如何充分发挥各编委在选题、宣传、组稿、学术把关中的重要作用 .二 .　请各有关单位在目前新的形势下推荐 (或自荐 )与本刊学科领域相关的专家…     

《分析测试技术与仪器》简介

《分析测试技术与仪器》是经国家科委批准向国内外公开发行的技术性季刊 (刊号 :ＩＳＳＮ 10 0 6 - 375 7,ＣＮ6 2 - 112 3/Ｏ6 ) ,由中国科学院综合计划局、中国科学院兰州分院分析测试中心和中国科学院兰州化学物理研究所主办 .创办于 1992年 ,在当时填补了中国科学院技术期刊的空白 .10年来 ,它担负着技术传播、交流、研讨及学科发展的导向作用 ,始终以繁荣分析测试科学为己任 ,得到了全国科研、高校、厂矿、企事业单位广大科技工作者的厚爱 .1　办刊宗旨及特色本刊的服务对象主要是在科研、教育系统隶属的分析测试中心、开放实验室、各…     

四川省分析测试技术联合服务中心成立并开展活动

为发展横向的分析测试技术联合,四川省于去年十一月成立了省分析测试技术联合服务中心,成员单位由四川大学、成都华西医科大学、成都科技大学、中国科学院成都分院分析测试中心、成都有     

电解液添加成份对贮氢电极性能影响的初步研究

电解液添加成份对贮氢电极性能影响的初步研究蔡称心，黄翠虹（南京大学化学系，南京，２１０００８）王宝忱（中国科学院长春应用化学研究所，长春１３００２２）关键词：贮氢电极，ＭＨ／Ｎｉ电池，添加剂自从Ｊｕｓｔｉ和Ｅｗｅ￣［１，２］发现贮氢合金能够用电化学方...     

Time behaviour of the modifier involved in the general mechanism of Botts and Morales assuming rapid equilibrium in the modifier bindings

To date, the classification as activator or inhibitor of a modifier involved in an enzyme catalysed reaction is established according to its kinetic behaviour at the steady state. Inhibitors and activators are defined as modifiers which decrease or increase, respectively, the steady state rate of an enzyme-catalysed reaction. At this state, in some cases, a modifier always acts as an activator or as an inhibitor for all its possible concentration values. In other cases the action of a modifier as activator or inhibitor depends on its concentration. In this paper we extend the analysis of the kinetic behaviour of a modifier as inhibitor or nonessential activator to the transient phase of the reaction, i.e. to the whole course of the reaction, including both the transient phase and the steady state. Moreover, concerning to the behaviour of a modifier at the transient phase, we suggest its classification as activator or inhibitor based on the concentration and activator or inhibitor based on the rate. We have studied the behaviour of the modifier involved in the general modifier mechanisms of Botts and Morales in which the reversible bindings of the modifier to the enzyme forms are assumed in rapid equilibrium. The result is that depending on the values of the rate constants, equilibrium constants and the initial concentrations of both the involved substrate and modifier, the latter can act during the whole reaction course only as an activator, only as an inhibitor, first as an activator and then, from a determined reaction time, as inhibitor, or vice versa. Therefore, it is possible that a modifier showing an activating behaviour at the steady state behaves as an inhibitor in the transient phase, or vice versa. Novel indices pointing to the conditions under which the modifier can show any of the behaviours indicated above are suggested. The goodness of the analytical results is tested by comparison with the simulated curves obtained by numerical integration. From these results, those corresponding to several reaction mechanisms involving a modifier, and which can be regarded as particular cases of the general case analysed here, can be directly and easily obtained.     

二胺结构对聚酰胺复合纳滤膜性能的影响

分别以邻苯二胺、间苯二胺、对苯二胺为水相单体,均苯三甲酰氯(TMC)为油相单体,聚醚砜超滤膜为基膜,界面聚合法制备了复合纳滤膜.在纳滤膜对Na<,2>SO<,4>,MgSO<,4>,MgCl<,2>和NaCl四种盐的脱盐率中,间苯二胺膜最高,对苯二胺膜居中,邻苯二胺膜最差;在纳滤膜耐氯性能方面,对苯二胺最佳,邻苯二胺居...     

Behavior of the Surface Tension and the Viscosity in the Eutecticregion of the Liquid Feb alloy

Abstract

Thermodynamic and transport properties of pure liquid metals show interesting correlations near the melting temperature. This is well known for the case of the surface tension σ and the shear viscosity η In this paper we investigate the possible extension of these correlations to binary alloys, taking the FeB alloy as a case study. Based on literature data we analyze the variation of σ and η as a function of temperature and concentration in a deep eutectic region of the phase diagram of this alloy, as well as the possible correlations between those two quantities. Substantial differences with respect to the behavior in pure metals are found.     

Study of the influence of the graphite powder particle size on the structure of the Sonogel-Carbon materials

In this paper, the influence of carbon particles size on structure and on electrochemical and physical properties of the Sonogel-Carbon electrodes, with respect to Sonogel materials without graphite, have been studied. The materials have been characterized electrochemical and structurally; several Sonogel-Carbon materials were synthesized using different types of graphite powder as massive modifiers, adding in some cases other modifiers, such as octadecyl (C18) and polyethyleneglycol (PEG). Differential pulse voltammetry and cyclic voltammetry were the voltammetric techniques employed to evaluate the electrochemical behaviour; Scanning Electron Microscopy, Energy Dispersive Spectroscopy and Infrared Spectroscopy were the techniques employed to realize the superficial/structural characterization of the materials. The results obtained in both studies were very useful to explain the structure of the Sonogel-Carbon materials. Furthermore, they allowed to conclude that electrodes based on RW-B and UF graphites show very similar electrochemical behaviours and internal structures.     

The application of retention indices using the alkylarylketone scale to the separation of the barbiturates by HPLC. I. The effect of the eluent

Summary In order to determine the applicability of retention indices, based on the alkylarylketone scale, as the basis of a reproducible method of reporting retentions, the separation of ten barbiturates and a set of column test compounds were examined on an octadecylsilyl bonded silica (ODS-Hypersil) column with methanol-buffer pH 8.5 as eluent. The effects on the capacity factors and retention indices, on changing the eluent composition, pH, ionic strength and temperature, showed that the retention indices of the barbiturates were much less susceptible to minor changes in the eluent than the capacity factors. For non-ionised compounds the retention indices were virtually independent of the experimental conditions. Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984     

Investigations of the influence on the phase morphology of PP-EPDM-blends on their mechanical properties

This work covers the dependence of the mechanical properties of polymer blends on their composition and their phase morphology. Blends of EPDM-elastomers and polypropylene were prepared covering the whole concentration range. The phase morphology was varied strongly by employing different mixing techniques and its morphology was characterized by means of electron microscopy and light microscopy, as well as by x-ray scattering and calorimetry.Mechanical properties such as the complex shear modulus, the tensile modulus as well as the stress strain behavior were investigated as a function of the composition of the blends and their phase morphology. The experimental finding is that the complex modulus, the tensile modulus, the yield stress, and the ultimate stress are rather insensitive with respect to the phase morphology and vary continuosly with the composition. The elongation at break, on the other hand, as well as the impact strength were found to depend on the phase morphology and to vary discontinously with the composition. One conclusion to be drawn is that one is not always forced to control the phase morphology tightly during processing in order to obtain materials with sufficiently good mechanical properties. Rather, simple theoretical approaches, neglecting details of the phase morphology are frequently able to satisfactorily predict mechanical properties of multiphase blends.     

Effects of the structure of the branches on the two-photon absorption properties for the multi-branched molecules with nitrogen (N) as coupling center

In order to investigate the effects of the structure of branches on the TPA properties for multi-branched molecules, the TPA cross section is calculated by using ZINDO/SOS method. The investigated mole- cules have different branches (chomorfores based on stilbene, dithienothiophene and flourene) with nitrogen(N) as coupling center. The results show that the cooperative enhancement in multi-branched molecules depends on the structures of the branches and the structures of branches play an important role in the enhancement of the TPA cross section. The designed molecules with stilbene and dithie- nothiophene as branched possess relatively larger two-photon absorption cross sections.     

Microscopic interpretation of the dependence of the contact angle on roughness

The macroscopic contact angle theta(m) of a liquid drop on a rough solid surface in the presence of a gas is calculated microscopically on the basis of a variational minimization of the total potential energy of the drop. Two limiting cases are considered: the liquid penetrates into the space between asperities (Wenzel regime) and the liquid resides on the top of asperities (Cassie-Baxter regime). Long-range as well as short-range interactions between the molecules of liquid, solid, and gas are taken into account. It was also assumed that small portions of insoluble gas are accumulated near the edges of the asperities during the formation of the droplet. The contact angle depends on several parameters involved in the microscopic interactions as well as on the fractions of solid surface between asperities, and of the surface of the asperities themselves, that are in contact with the liquid. It is shown that the theory can explain the nonlinear dependence of cos theta(m) on roughness observed by Krupenkin et al. [Krupenkin, T. N.; Taylor, J. A.; Schneider, T. M.; Yang, S. Langmuir 2004, 20, 3824].(1).     

Experimental study of the formation of high-resistivity zones at the gel/buffer interface in CE

A novel, nondamaging method for experimental characterization of the formation and propagation of high-resistivity zones in CE, based on the measurement of time-dependent Joule heating on the outer capillary surface is proposed. The method detects propagation of resistive regions in capillaries in real time and allows the estimation of their velocity and resistance. The presented experimental data are in agreement with the results of the computer simulation as well as with previous data on the subject. The proposed method is useful for the development of new polymers as well as for the refinement and optimization of new CE protocols.