阻火器的选用

阻火器的选用是石油化工厂、石油和天然气工厂、有可燃性气体的工厂生产安全保护和工程设计中常遇到并需解决的问题，本文对阻火器产品的选用步骤提出了个人的一些理解意见。     

广东省石油和化学工业现状发展趋势和人才需求的分析报告

我省石油和化学工业2002年产值1500亿元，至2010年发展显著，产值将成倍增长。本文分析了我省石化工业在我省经济发展中的地位。工业发展伴随人才的需求，我省的人才培养，高等技术人才可以满足发展的需要，唯中级技术人才明显不足。为此，在今后几年中要认真巩固和发展我省石化中级技术人才的培养基地。     

A Sedimentation-Dispersion Model for both Non-attached and Attached Particles in Three-Phase Batchwise Fluidized Beds

The axial concentration distribution of both particles with better wetting (forming non-attached system) and poorer wetting (forming attached system) was investigated in a vertical gas-liquid-solid fluidized bed of 4.2 cm in diameter and 130 cm in height with the solids holdup less than 0.05. The one-dimensional sedimentation-dispersion model could be used satisfactorily to describe the axial distribution of solids holdup by modifying only a model parameter, i.e. by means of the terminal settling velocity minus a certain value, which is a function of gas velocity and considers the effect of an additional drag force resulted from attached rising bubbles. The axial profiles of solid concentration predicted are in good agreement with experimental results. This model also explains reasonably the different axial distributions of solid concentration, i.e. the solids holdup decreases as the axial height increases in non-attached system, but increases with the axial height in attached system at a given gas veloc     

线性规划的可行解集合的几何特征

本文提出平凡解是基可行解,也是极点,对基可行解与极点是等价概念给出一种证明方法,指出E~n中的可行解集合有类似R~2中的凸多边形的一些特征。     

Ion Flotation of Scandium

Scandium was recovered from dilute chloride solutions with potassium salt of saturated C_8～C_(12)fattyacids as surfactant by Ion flotation.The optimum comprehensive results of physical properties,stability andscandium concentration of the foam formed with potassium caprate CH_3(CH_2)_8 COOK can be obtained.Re-covery of scandium in the foam was 98% at pH 3.8～5.0 and 25～55℃.The experimental results of 0.3 L/minairflow rate was satisfactory for flotation column.It is of a great potential for using ion flotation technique toconcentrate scandium from dilute solutions.     

Fluorescence enhancement and cofluorescence in complexes of terbium(III) with trimellitic acid

1. Introduction Rare earth elements have an important function inlife process. The fluorescence enhancement of lan-thanides in aqueous solutions has therefore becomean area of active study in trace-level estimation oflanthanides using spectrofluorimetry [1]. Its possiblemechanism and application as fluorescence probesin biological systems have also attracted attention inrecent years [2]. Generally, fluorescence enhance-ment can be achieved through ligand sensitization.Various ligands have bee…     

镍硫化物阳极溶解的电化学研究

研究了合成镍硫化物的阳极过程。Ni_3S_2,Ni_7S_6和NiS的活性溶解伴随着生成表面产物层,其反应机理与电极电位有关。根据三种不同类型产物层生成规律的电化学研究,Ni溶出表观电子数的测定,以及产物层相组成分析和相的元素分析,认为存在三组平行反应:直接生成HSO_4~-或SO_(4-)~2的反应,生成中间硫化物的反应及生成元素硫的反应,每组反应具有不同的优势发展电位区。NiS_2阳极溶解时,基本上为生成HSO_(4-)或SO_(4-)~2的反应。     

THERMOGRAVIMETRIC STUDY OF DIRECT CARBURIZING BY NATURAL GAS

<正> 在渗碳等金属表面化学热处理过程中,金属的渗碳、脱碳、氧化、还原等均出现高温下重量变化,根据热天平的工作原理,可以对金属表面渗碳过程进行工艺研究和机理探讨。 我国的天然气资源丰富,直接用天然气作碳源在金属表面渗碳,似有值得推广采用的意义。 曾以20CrNiMo钢用热重法研究常压渗碳和真空渗碳两种工艺,大量实验结果说明:用热重法研究气体渗碳的工艺参数,并直接采用天然气渗碳,都是可行的。     

大型薄壁组焊椭圆封头尺寸及变形的控制工艺

叙述了在压力容器制造中,当简体组装、封头分片压制后,焊接大型薄壁椭圆封头,其尺寸和角变形量的控制工艺。     

FeCl3浸取含Au复杂硫化矿的动力学研究

研究了FeCl_3溶液浸取复杂含金硫化精矿中有价金属Cu,Ag,Pb和Zh的过程,考察了主要过程参量对浸取速率的影响.实验数据用非线性回归方法处理,给出动力学模型,说明精矿中Cu的溶解过程由表面化学反应控制,其速率是Fe~(3+)的0.5级和Cl~(-)的零级反应.实验条件下Cu,Ag,Ph和Zn的最终浸取率分别达到96,95,90和91%,超过90%的Fe进入浸取液,总硫的70%以上转化为元素硫,而Au的浸取率则小于3%表明FeCl_3溶液浸取是含Au复杂硫化精矿预处理并回收有价金属的有潜力的方法