Measurement of oil volume fraction and velocity distributions in vertical oil-in-water flows using ERT and a local probe

INTRODUCTION The need for metering multiphase flow in the petroleum industry has been evident for many years. Considerable research has been conducted into this field for developing a suitable flowmeter which can be used in industrial environments. Various tech- nologies have been employed, and among which the tomographic techniques are increasingly being used. Process tomography is an emerging measure- ment technology with applications in a broad range of industries. It is non-invasive a…     

如何选择合适的教学设施资源

作者从软件和教具设备两个方面介绍了英国教师选购教学设施的具体作法，同时提供了教育展示会方面的资讯。     

改进的割平面法求解整数规划

从线性规划问题着手,在利用单纯型法的时候,当约束矩阵中出现分数,利用初等的方法推导出定理1,给出一种"化分为整"的方法。然后在割平面方法来解决整数线性规划的理论基础上,利用初等数论中[x]和{x}的特性,推导出定理2,把"化分为整"的方法进行到底。     

Kinetic Study of Hydrothermal Stripping from Iron-Loaded Organic Phase

The iron-loaded organic phase of naphthenic acid-isooctyl alcohol-kerosene was prepared, and the process kinetics of hydrothermal stripping of iron from the phase was studied. Several factors affecting hydrothermal stripping, such as the polymer of naphthenic acid, initial concentrations of iron and naphthenic acid, temperature and agitation time, were investigated, and based on experimental results and theoretical analysis, two kinetic models were established.The stripping rate equation suggests that the hydrothermal stripping process activation energy is 96.4 kJ·mol-1 and the stripping is controlled by hydrolysis of naphthenic complex of iron. The values calculated by the stripping fraction equation comparatively accord with the experimental data.     

Numerical prediction of vortex flow and thermal separation in a subsonic vortex tube

INTRODUCTION Vortex tube is a device for producing hot and cold air when compressed air flows tangentially into the vortex chamber through the inlet nozzles. This causes the vortex and swirl flow movement inside the vortex tube. The air in the middle region of the tube has lower velocity and lower temperature than the inlet air. So the air near the tube wall has higher ve-locity and higher temperature than the inlet air. The cold air in the core region of the tube flows out through the o…     

基于超声的管道内粉体体积分数的测量

管道内粉体的气力输运广泛存在于化工、食品加工、电力、冶金和医药等工业生产过程中.通过对粉体颗粒的速度、体积分数和粒度等关键参数进行在线测量, 可实现过程优化控制, 提高生产效率和产品质量,降低能耗.本文从声散射理论模型出发,数值模拟并拟合出超声衰减系数和声速随粉体体积分数的变化关系.设计中心频率为30 kHz的一体式超声波探针,在杭州某水泥厂输运管道进行管内不同深度测点水泥生料粉体浓度的在线测量,分别以衰减和声速方法获得管内粉体沿径向的体积分数分布.     

幂函数的叠加势的径向Schr（O..）dinger方程的精确解

本文采用连续分数法对势函数υ(r)=α1r6+α2r2+β2r-4+β1r-6进行了求解,得到叠加势的径向SchrOdinger方程的精确解。此法简单明了,可推广应用到一类叠加势的SchrO¨dinger方程的求解。     

可持续发展与中学化学教师继续教育

本文论述了中学化学教师的继续教育是教师自身可持续发展的战略需要 ,同时对可持续发展的持续性、整体性、协调性与中学化学教师继续教育的关系作了阐述 ,尤其是在可持续发展思想指导下如何建立中学化学教师继续教育的课程提出了新观点。     

Werner型矩阵有理插值和递推算法

In this paper, a practical Werner-type continued fraction method for solving matrix valued rational interpolation problem is provided by using a generalized inverse of matrices. In order to reduce the continued fraction form to rational function form of the interpolants, an efficient forward recurrence algorithm is obtained.     

从古典走向中世纪的基督教

基督教的产生和发展是具有世界历史意义的现象.自文艺复兴至启蒙运动直到近现代的许多思想家与史学家大都认为,基督教对西方文明的影响基本上是消极而又黑暗的.如果将基督教放在西欧从古典时代走向封建时代这一历史大转变过程中,作客观冷静的历史主义分析,那么,关于基督教对西方文明的影响,就会是一种相反的结论,即基本上是积极而又光明的,其中至少有三点是可以肯定的一是在罗马帝国腐朽衰亡之际,基督教作为"救世福音"抚慰,安定了人们的灵魂与精神;二是基督教的修道士和神学家们以变态、扭曲的方式,保存并延续了希腊、罗马的古典文化;三是基督教的教会、教区和修道院等机构,成为日耳曼民族建立和扩大其政治统治、恢复生产并发展社会经济的组织借助.基督教在这三方面的地位和作用,在当时的历史条件下,几乎都具有一种唯一的和不可替代的性质.因此,基督教是西欧在古典时代末期和封建时代前期重塑文明的核心力量.