对物理化学考研中二组分固-液体系相图的考点的分析

相平衡是物理化学考研科目必考内容,结合各高校的物理化学考研真题对相平衡中二组分固-液体系相图考点进行了总结和深入分析,有助于考物理化学科目的学生能更好的理解和掌握二组分固-液体系相图这一考点。     

对物理化学考研中van der Waals方程及其应用考点的分析

对物理化学考研中van der Waals方程及其应用的考点进行深入分析,使考物理化学科目的考生能很好的理解和掌握此考点。     

对物理化学考研中热力学第一定律考点的分析

热力学第一定律是物理化学考研科目必考内容。通过对热力学第一定律的数学表达式、文字表述形式、公式适用条件等方面的介绍,并结合各高校的物理化学考研真题对考点进行了深入分析,使考物理化学科目的学生能更好的理解和掌握热力学第一定律。     

物理化学电池电动势部分考研考点的分析及应用

电化学是研究化学现象和电现象之间的相互关系以及化学能与电能相互转化规律的学科,是物理化学的重要组成部分,也是物理化学考研科目的必考内容。可逆电池电动势的计算及应用是电化学中非常重要的内容。本文结合物理化学考研真题对可逆电池电动势的计算及应用内容的考研考点进行了总结和深入分析,以期为物理化学的教学提供参考,使学生能更好的理解和掌握此考点。     

将考研考点引入《物理化学》课程教学的研究

考研是新近升本院校提高学生高质量就业的途径之一。通过对化学专业《物理化学》课程的考研真题进行分析,总结考研考点;将上述考研考点与《物理化学》课程的教学内容有机结合,编写教案,应用于教学中。此项研究有针对性地培养学生的考研意识,使学生有效地了解考研考点、试题的分析思路,打消学生惧怕考研的心理,树立考上研究生的信心,取得了很好的教学效果。     

"物理化学"课程中考研考点的分析研究

"物理化学"是化学相关专业最重要的基础学科之一,也是一门理论性很强的学科,是化学相关专业的本科生考研必考专业课之一.对"物理化学"考研真题进行分析,总结出考研考点,学生据此可以增强对考研知识难度和深度的了解,更好地应对考研中的"物理化学"课程.     

药学专业物理化学实验绿色三液体系的研究

结合药学学科专业特点和物理化学实验绿色化教学改革的要求,设计了以水杨酸甲酯、异丙醇和水为物质基础的三组分液-液体系;采用滴定实验观察三元体系由清澈的单相区向浑浊的多相区转变的情况,根据溶解度曲线绘制了水杨酸甲酯-异丙醇-水三元相图。该三元液-液体系绿色无毒害,同时可指导药用挥发油制剂的处方选择,建议在医药类院校的物理化学实验中推广使用。     

Origin在物理化学实验中的应用

常见的物理化学实验的数据大概可以分为线性拟合,多项式拟合,分段数据拟合等。应用origin8.0软件对双液系气-液平衡相图做线性拟合得出直线方程,再绘制相图,对燃烧热的测定实验进行分段拟合等。相比于传统的方法,软件处理数据简便、快速、直观合理、准确性强等特点,在物理化学实验的教学中发挥了极大的作用。     

C~#语言计算绘制Pb-Sn二元金属相图

针对物理化学实验教学中的Pb-Sn二元金属体系的相图,采用C~#高级计算机语言编制了程序,结合文献中该体系的热力学参数,快捷方便地获得了该二元相图的液-固相平衡线的组成和温度数据,并绘制了该二元体系的相图。将计算的该体系的最低熔点的组成和温度数据与文献报道的数据进行了比较,发现两者吻合很好,说明该二元体系的相图计算是准确可靠的,将其用于学生相图实验数据的比较,可以促进物理化学相图的实验教学。     

物理化学实验数据处理中Origin软件的应用

物理化学实验数据的主要处理方法有列表法、方程式法、作图法等。Origin软件在物理化学实验数据处理过程中的绘图与实验数据结合方面有着突出优势。本文结合怀化学院的实际情况,通过纯液体饱和蒸气压的测量及双液系的气-液平衡相图两个经典物理化学实验所得数据的分析,采用线性拟合与非线性拟合法一定程度上诠释Origin软件在物理化学实验数据处理中的优势和数据分析功能。     

新型气化型煤粘结剂

介绍一种新型气化煤粘结剂的制备方法和粘结作用机理，该粘结剂属有机粘结剂，粘结能力强，煤种适用范围广。制取的气化型煤机械强度高，灰份低，固定碳含量高。     

汽车用灯头的注射模设计

针对汽车用塑料灯头的结构特点与工作环境,分析了灯头结构的复杂性、材料性能,注身工艺条件、合理地设计了注射成型模具,采用了组合式下模型芯来完成内孔的复杂成型,同时采用组合式侧抽芯来完成外侧面的卡钩与上面的穿线孔的成型,简化了模具的结构。     

Criteria for the affinity of dyes for fibres

An equation was obtained for evaluating the thermodynamic affinity of a disperse dye for a fibre. Quantities Δh _D and K _D , which are functions of the composition of the dye bath, temperature, and state of the fibre material, can characterize the change in the affinity of the dye for the fibre when the dyeing conditions are varied.     

焊制三通雌雄样板计算机放样软件的开发

应用VC 语言开发了焊制三通雌雄样板放样软件,该软件能快速、准确地完成正三通、斜三通、顺流三通、Y型三通雌雄样板的放样工作。详细介绍了程序的编制过程以及软件的特点。     

Guidance for Mutual Disposition of Chromophores for Singlet Fission

The choice of chromophores and of their mutual geometrical arrangement for optimized singlet fission (SF) rates are considered. The electronic matrix element that enters the Fermi golden rule for the rate of SF is worked out algebraically for a simple model, but the density of states factor is not analyzed here. The model treats only the highest occupied and lowest unoccupied orbitals of the partners. It provides an approximate formula that requires only the knowledge of the expansion coefficients of these orbitals and of overlap integrals between atomic orbitals on the partners to obtain an estimate of the electronic matrix element. An illustrative application to a pair of ethylene molecules suggests that favored geometries will be those in which one of the AOs on the first ethylene overlaps with both AOs on the second ethylene, while the other AO on the first ethylene overlaps with at least one, and preferably both, AOs of the second ethylene as little as possible.     

Strategy for development of fertilizer solutions for greenhouse tomatoes

A study of fertilization practices in intensively grown tomatoes, leading to a projection of developments in fertilizer usage is presented. Targets of optimal fertilization strategy were defined as follows: maximize fruit yield; maximize fruit quality; minimize environmental pollution with fertilizers; minimize corrosion of the fertilizer distribution system; minimize expenses on fertilizers. Information was gathered by literature searches and by personal interviews and visits to research institutes and growers.Rechecking of some fertilization practices for greenhouse tomatoes grown in detached media is proposed. The review indicates that the following should be rechecked: ammonium/nitrate ratio in fertilizer formulations; use of urea in fertilizer solutions; levels of phosphates applied; levels of sulphate applied; simple iron salts vs. chelated iron application; osmotic potential (OP), expressed as electrical conductivity (EC), of the nutrient solution at various growth stages.EC, pH and estimated prices of fertilizer solutions were calculated and presented in tables.     

Test procedure for evaluation of catalysts for nitrile reduction

A procedure was developed that examines the effectiveness of nickel catalysts for the hydrogenation of fatty nitriles to amines. Rates of reaction, selectivity, and olefinic reduction were the parameters studied. The procedure can be used for new catalyst screening and is ideally suited for quality assurance testing of production catalysts. It involves the reduction of nitriles to amines at 410°F (210°C) and 500 psig using a .2% Ni loading level. A mixture of primary and secondary amines is obtained which is characteristic of the catalyst’s selectivity. Both sponge and supported nickel catalysts were tested using tallow nitriles as the feedstock.