储氢合金电极的表面修饰研究

利用等离子体技术对AA型MH/Ni电池的储氢合金电极进行了镀覆导电膜层的表面修饰,用XRD及SEM对电极结构进行了表征.极片经过表面修饰的电池,其内阻降低了24％,放电容量有了明显提高,5C (7.5 A) 放电容量提高了200 mA•h,放电平台电压提高了约0.14 V,导电膜层还起到了电极保护层的作用,抑制了合金的粉化,提高了电池的循环稳定性.同时,电池内压显著降低,电池性能有了较大改善.     

Design of a PFW European type impact crusher

介绍了一种PFW欧版反击式破碎机,由于该机采用了重型转子装置,取得了较好的破碎效果。该破碎机结构科学合理,使用安全可靠,维护方便快捷。与传统反击式破碎机相比,不仅延长了设备的使用寿命,缩短了耐磨件的更换时间,而且提高了生产效率,增加了经济效益。     

《分析化学》第十卷(1—12期)总目录

研究报告期页码 1) 6)11)16)21)26)65)70)74)82)87)91)129)134)138)1土3)1凌8)r、了吐、了.、‘r、矛‘、了吸、了官、J‘、了胜、护叮‘了、了叮、了‘、了胜、了.、(了‘1 1111122222233333152)193)196)199)204)210)214)257)262)267)矛矛几、矛r‘、矛.、‘r、了仁、尹t、J‘‘、fl‘、了几、几口44 4 4 4 4 la 55(272)(277)(281)(321)5弓56、.了、.2、、工、声‘1户、.,了、,产、.产、、了、.夕连0 4 8 2 la一匕吮jg六工J32 33 33 33 34 38 58 39 3940产.、夕‘.、了,、产亨.、护口气矛亨‘了.、产.、沙f、了.、6 6 6 6 6 7 7t了777 8 …     

碳60分子模型的简易制作方法

碳60的发现是荣获了1996年诺贝尔化学奖的重大贡献,将我们带进了又一个化学新世界。实践中碳60分了的独特构型引起了中学化学教师和学生的极大兴趣,但尚缺少其分了模型的简易制作方法。作者在教学过程中创造了一种碳60分了模型的制作方法。     

β—环糊精和α—萘乙酸包络物的荧光光谱研究

本文研究了水溶液中β－环糊精和α－萘乙酸包络反应，研究了包络物的荧光光谱性质，测定了包络物的形成常数，讨论了各种水溶性一元醇对该包络物形成及荧光性质的影响，并对其应用了作了预测。     

农科有机化学课程建设的探索与实践

对农科有机化学课程存在的一些普遍问题进行了分析;结合当前农林院校的特点,建立了符合农业院校特点的教学新体系;编制了一系列教材;建设了精品课程网站;建立了教学质量评价体系;建设了一支结构合理、教学水平高、团队精神好的教学队伍。     

前言

自20世纪初期,德国化学家EmilFischer首先合成了甘氨酸二肽片段,并第一次提出“peptide”（多肽）这一名词,多肽化学的研究已经历了100多年的发展．1953年,Vigneand小组首次完成了生物活性肽催产素的合成,并因此于1955年获得了诺贝尔化学奖．1963年,Merrifield提出了多肽固相合成法,并发明了第一台多肽自动合成仪,大大简化了多肽合成的流程、提高了合成的效率,从而促使多肽化学实现了飞跃式发展,Merrifield也因此获得了1984年诺贝尔化学奖．1965年,我国科学家完成了牛结晶胰岛素的合成,     

氧化锌对MCM-22分子筛晶化的影响

 采用静态水热合成法,以六亚甲基亚胺为模板剂,在氧化锌存在下合成了MCM-22分子筛,考察了氧化锌对MCM-22晶化的影响. 结果表明,少量氧化锌的添加抑制了杂晶的生成,缩短了晶化诱导期,提高了晶化速度,扩大了硅铝比的范围,降低了模板剂的用量.     

促进学生认识发展的“电离和离子反应”专题的单元整体教学研究

系统梳理了电离、离子反应专题的已有研究,分析了电离、离子反应内容对学生认识发展的作用,进而确立了化学1模块电离、离子反应专题的教学论问题并进行了阐述分析。在上述研究的基础上,设计了化学1模块电离、离子反应专题的单元整体教学,并进行了教学实践,取得了较好的教学效果。     

无机化学微信平台的构建与实践研究

针对无机化学传统教学模式的不足,构建了无机化学微信平台。介绍了构建平台必需的微信公众号和微信群的建立过程和方法。分析了无机化学微信平台在教学中的实践效果,弥补了传统教学中的不足。讨论了无机化学微信平台的积极作用,提高了教师教学水平和学生的学习能力,达到了师生双赢的目的。     

小电流交流示波极谱E～t曲线理论公式的推导方法

本文用电极等效电路原理推导了小交流电流情况下的E～t曲线方程式,在近似应用于大电流的情况时,与Micka公式相似,当进一步近似时即可得Micka公式,但在纯充电时可得到与Heyovsky公式相一致的结果,弥补丁Micka公式的不足,能说明一些Micka公式不能说明的现象。     

ADSORPTION DYNAMICS OF MACROPOROUS POLYMERIC ADSORBENT Ⅱ. The Studies on the Film Diffusion Mass-Transfer Process

1 INTRODUCTIONAt present time, most of the studies for the adsorption dynamics of macroporous adsorbent,.especially for the film diffusion mass-transfer process, were based on the conclusions for theBoyd ion-exchange dynamics equationl'l. The structure of gel-type ion-exchange resin andmacroporous polystyrene resin is different. Because of having the hydrophilic group, both of theirmer and outer of the ion-exchange resin can swell to the reticulation struCture in the aqueous.Based on the…     

A Method of Determining Selectivity Coefficients Based on the Practical Slope of Ion Selective Electrodes

It is a problem to be solved that the experimental selectivity coefficients of ion selective electrodes( ISEs) depend on the activity. This paper studied the new method of determining selectivity coefficients. A mixed ion response equation, which was similar to Nicolsky-Eisenman (N-E) equation recommended by IUPAC, was proposed. The equation includes the practical response slope of ISEs to the primary ion and the interfering ion. The selectivity coefficient was defined by the equation instead of the N-E equation. The experimental part of the method is similar to that based on the N-E equation. The values of selectivity coefficients obtained with this method do not depend on the activity whether the electrodes exhibit the Nernst response or non-Nernst response. The feasibility of the new method is illustrated experimentally.     

Predicting points of zero charge of oxides and hydroxides

Pauling's electrostatic valence principle has been applied to describe the surface-charging mechanism of oxides in an aqueous environment. This approach has led to the development of an equation with which one can predict the points of zero charge (PZC) of oxides and hydroxides from crystallographic data. The equation proposed in the present work is an improved version of Parks' PZC equation. The improvements are the following: (i) The equation does not incorporate correction terms to take the cation coordination numbers into account; (ii) the PZC of a complex oxide can be predicted directly from crystallographic data instead of from “assumed” PZCs of its component oxides; and (iii) one can use the mean metal-oxygen bond distance of a crystal instead of the ionic radii tabulated by Parks, which are not consistent with the up-to-date values.     

The PVT Properties Calculation of Water by BWR Equation

The classical theory of the equation of state first formulated by van der Waals1 has shown that a universal relation among pressure, volume, and temperature exists. In spite of the large number of equations of state that have appeared during the last century, very few people seems to have developed an equation with a reasonable number of empirical constants, and few constants have a clear physical significance. The successful empirical development is the virial type equation of state. It is…     

A new non-cubic equation of state

A new non-cubic equation of state is presented in this work. This expression is obtained from the original Redlich—Kwong equation of state by assuming that the attraction parameter depends not only on temperature, but also on density. Vapour—liquid equilibria in the coexistence region and PVT properties for the liquid, gas and supercritical fluid phases are accurately calculated with four parameters per isotherm. The generalization of this equation by a corresponding states correlation enables it to be applied over wide ranges of temperature, pressure and hydrocarbon molecular weight.     

Isothermal vapor-liquid equilibria for the binary systems propylene-carbon dioxide,propylene-ethylene and propylene-ethane at high pressure

isothermal vapor-liquid equilibria for the binary systems propylene-carbon dioxide, propylene-ethylene and propylene-ethane have been measured at 283.15 and 298.15 K using a static method.The equilibrium data obtained have been correlated with the total-pressure method using both the Redlich-Kwong equation of state modified by Soave and the perturbation equation proposed by Gubbins and Twu. From normal probability plots of the residuals in the correlations versus the theoretical residuals in the normal distribution, the applicability of each of these two equations has been tested statistically.Furthermore, the fugacity coefficients calculated from the virial equation have been compared with those obtained from the correlations for the low-pressure regions.     

Ternary liquid—liquid equilibria for acetonitrile—ethanol—cyclohexane and acetonitrile—2-propanol—cyclohexane

Liquid—liquid equilibrium data were obtained for two ternary systems: acetonitrile— ethanol—cyclohexane at 40°C, and acetonitrile—2-propanol—cyclohexane at 50°C. Binary vapor—Liquid equilibrium data were measured for acetonitrile—2-propanol at 50°C. The binary parameters of the Zeta and effective Zeta equations were evaluated from equilibrium data for binary pairs. The parameters obtained were used to predict the ternary liquid—liquid equilibrium data for six systems involving the present systems and the ternary vapor—liquid equilibrium data for one completely miscible system and two partially miscible systems without adding any ternary parameter. A heterogeneous area calculated by the Zeta equation is in general too large and does not decrease appreciably with increasing values of the third parameter ζ of the Zeta equation. However, the effective Zeta equation works much better than the original Zeta equation in data reduction.     

交流示波极谱基础研究(Ⅲ)——底液Micka公式的修正

在交流示波极谱实际应用中,常需要迭加一个直流分量以改善示波极谱图形。     

Systematic errors in the measurement of heat by flow microcalorimetry

It is shown that a number of systematic errors must be considered when performing heat measurements by flow microcalorimetry because the nature of the flow technique is such that substantial heat loss can be incurred. The conventional procedure of electrical calibration is found to be an inadequate correction parameter. Equations to account for the effects of thermal disequilibrium are derived from the basic principles incorporated in the Tian equation. The predicted relationships are tested by simple experiments and shown to be correct. The various correction parameters are measured for a wide range of flow rate and heat input conditions. A composite equation is presented which allows for the correction of heat loss while deconvoluting electrical heat from a heat of reaction. The total heat output rate from a flow calorimeter can be calculated for most experimental conditions by reference to this equation and to the tabulated correction values.