载金树脂硫脲硫酸解吸规律的研究

本文对硫酸和氰化钠分步解吸载金树脂上的贱金属离子，以及用硫脲硫酸溶液解吸载金树脂上的金、银络离子的解吸过程进行了研究，并通过现场采集的数据绘制了解吸曲线。     

恢复地层剥蚀厚度方法综述

恢复地层剥蚀厚度是对盆地进行定量研究的重要基础工作。本文综述、评价了目前常用的恢复剥蚀厚度的方法,并对作者曾提出的天然气平衡浓度法作了进一步的阐述。     

移动通信市场调查方案的选择及结果分析

为了全面了解全国移动市场状况、邮电部经济中心受邮电部移动局委托制订了全国性移动通信市场调查方案，并对北京，南宁和北海三市进行了调查。本文介绍了这一方案的实施办法，并对上述三市的调查结果进行了分析。     

国内外改质沥青生产的现状及其发展

煤焦油沥青是炼铝及碳素工业的重要原料之一，它地质量如何直接影响到制品的技术经济指标。近年来，随着科学技术的发展，煤焦油沥青重整改质技术引起重视。目前已有许多国家已生产出改质沥青来满足制取电炉炼钢超高功率电极以及制品铝电解板的要求证同国内对此也开始进行研制工作。介绍了国内外改质沥青生产的现状及发展，并提出了参考建议。     

On the curing of a vinylester-urethane hybrid resin

Curing kinetics of a vinylester-urethane hybrid (VEUH) resin consisting of vinylester resin (VE) diluted in styrene and novolac type polyisocyanate (NPI) have been studied by differential scanning calorimetry (DSC). As VEUH is crosslinked via free radical polymerisation between the vinyl functions of styrene and VE, and polyaddition reaction between the secondary -OH groups of VE and -NCO of NPI, it was necessary to study these reactions separately. This was achieved by studying the curing with and without incorporating the NPI. The curing reaction was monitored by measuring the heat of reaction under isothermal and dynamic temperature conditions. Models describing the curing were developed, which are in good agreement with the experiments. A comparison between the curing of the VEUH and the VE resin without NPI leads to the conclusion that the curing of the VEUH as accessed by DSC is dominated by the radical polymerisation of styrene with VE although the two reactions are not time separated.     

A new approach to the mechanism of chlorine evolution: Separate examination of the kinetic steps using ac impedance on a rotating thin ring electrode

In the absence of a bulk diffusion effect, it is shown for the first time that the impedance spectra for the chlorine evolution reaction on a rotating thin ring electrode comprise three consecutive semicircles in the capacitive half of the complex plane. The first (highest frequency) semicircle is due to the charge-transfer resistance for chloride discharge and the simultaneous chlorine adsorption coupled to the double-layer capacitance. The second semicircle (around 5 Hz) is due to the adsorption and desorption of a chlorine intermediate. The third (lowest frequency, around 0.5 Hz) semicircle is due to the relaxation of surface oxygen species. The impedance data allow the steps of the overall reaction to be examined individually. On a Pt surface the rate of chloride discharge and simultaneous chlorine adsorption (the admittance of the first semicircle) is first order with respect to chloride concentration and has a potential-dependence close to 58 mV/decade. The rate of the adsorption and desorption process (the admittance of the second semicircle) is second order with respect to chloride concentration, and has a potential dependence close to 30 mV/decade. The time constant for the adsorption/desorption processes is ca 20 ms, independent of electrode potential in the range studied. These features are consistent with a mechanism in which a faster discharge reaction (Cl⁻ Cl_ad + e) is followed by a slower surface combination reaction (2Cl_ad → Cl₂), but inconsistent with mechanisms in which ion + atom desorption is predominant, the initial chloride discharge is slow, or a unipositively charged chlorine species is involved.     

On the kinetics of the autoxidation of fats: influence of pro‐oxidants,antioxidants and synergists

The influence of minor amounts of pro‐ and anti‐oxidants on the kinetics of the autoxidation of fat has been evaluated. The reaction rates of oxygen with the substrates were found to follow the same basic equation, hitherto established for pure substrates. There is evidence that the surface of the reaction vessel also acts as a reaction catalyst and its effect is proportional to the area of glass in contact with lipids. Oxidation is enhanced by trace metal ions as well as by surface‐active compounds (e.g. hydroperoxides and sterols). Antioxidants such as α‐tocopherol and butylated hydroxyanisole inhibit the oxidation by delaying the start of oxygen consumption (the induction period) while retarders like amino acids only decrease the rate of oxidation. Thus pro‐ and anti‐ oxidants affect either the start or the rate of oxygen consumption. The empirical formula dx/dt = k [O₂] (1‐x/n) f′(t) was found applicable to the different stages of oxidation.     

混凝土芯砂石桩复合地基加固堤防软基试验研究

介绍了一种新型的地基处理方法——混凝土芯砂石桩复合地基法及其在水利防洪堤软基加固工程中的应用情况。通过现场原位观测和试验,研究了混凝土芯砂石桩复合地基固结变形、孔压消散、桩土应力分担及承载力特性,结果表明混凝土芯砂石桩强度高,排水固结能力强,能迅速提高桩间土强度和承载力,应用于水利堤防工程既能控制堤防深厚软基的工后沉降,又能提高堤防边坡的稳定性,推广应用前景良好。     

井下气液混输泵试验台架设计及试验

为了对新研制的井下螺旋轴流式气液混输泵样机进行试验研究,建立了1套气液混输泵试验台架。整个试验台架由泵级部分、吸入部分、排出部分和数据采集部分组成。在给出试验样机基本结构和试验原理的基础上,阐述了样机的试验方法和步骤,通过试验得出样机在设计转速下输送纯水和含气体积分数为40%气液混输工况下的外特性曲线。前期的试验研究验证了新建立的井下气液混输泵试验台架和研制的井下螺旋轴流式气液混输泵样机均满足设计要求,同时也为下一步完善设计和今后样机的试验研究提供了依据。     

论高校的创新性学习

创新性学习是针对传统教育忽视大学生的创新意识和创新能力，知识经济对创新人才的呼唤而提出来的。本文阐述了创新性学习的特点，分析了大学生进行创新性学习应具备的四个条件，并就高校开展创造性学习应注意的四个方面提出了看法。