Sensitivity Analysis of Interfacial Tension Predictions for Hydrocarbon Fluids

The interfacial tension (IFT) of hydrocarbon fluids is commonly predicted by either the parachor method or the scaling law. The methods require equilibrium liquid and vapor phase composition and density. An equation of state would normally be required if experimental values are not available. However, the computation of density for simple hydrocarbons and reservoir fluids, despite the important advances achieved by cubic equations of state, still remains a weak link in these types of calculations. Thus, there exists a need to investigate the qualitative and quantitative effects, of such inaccuracies in the density, on IFT predictions. Moreover, the study presented in this work would be useful in reservoir engineering and enhanced oil recovery calculations. The results presented in this work indicate that the methods are highly sensitive to the inaccuracies in the density of both the liquid and the vapor phases. An error of around 10% in the liquid or the vapor density can result in an error of up to 200% in the estimated IFT. Two binary and one ternary mixture for which measured data on IFT, composition and density is reported in the literature form the basis of this study.     

TAB OLB工艺在LCM制造中的应用

本文介绍了TAB器件及其制造工艺，通过讲述ACF特性，细致地阐述了TABOLB的工艺原理及参数设定方法，并对工艺中容易出现的不良现象进行了分析。     

平板显示技术论坛TFT-LCD生产线的分类及组线设备

综观国内外的TFT-LCD生产线,基本上都由阵列制作、面板制作、模块制作三大部分。主要介绍了TFT-LCD生产线的分类及其阵列、面板、模块制作的各工序组线设备的概况,供大家参考。     

Mass transfer variation within a packed bed and its relation to liquid distribution

The limiting current method is applied to characterize the local mass transfer in the axial, radial and angular directions throughout a packed bed of Pall rings. This is expressed in terms of the particle-to-fluid mass transfer coefficient of ferricyanide ions obtained from the limiting currents measured during its reduction to ferrocyanide at different locations in the bed. Particular focus is placed on the variability of the mass transfer coefficient with position in terms of the quantity MT_VAR, equivalent to the normalized deviation of the function Sh/Sc^0.33. The results confirm those reported by other researchers using more traditional liquid collection and tracer methods. Mass transfer coefficients throughout the bed closely follow normal distributions for the range of Re values investigated. When a multipoint distributor is used, MT_VAR is already low at the lowest flow rate (Re=95) considered and remains unchanged with any further increase in flow rate. In the case of a single-point distributor, on the other hand, MT_VAR decreases with increasing flow rate, but always remains significantly higher than that observed with the multipoint distributor. Moreover, the MT_VAR value depends on whether irrigated or full flow conditions prevail and on the cross-sectional area of the sampling electrodes, suggesting that local mass transfer variations are caused by local liquid velocity variations once the Pall rings are sufficiently wetted.     

Numerical study of cavitating flow characteristics of liquid helium in a pipe

The fundamental characteristics of the two-dimensional cavitating flow of liquid helium in a vertical pipe near the lambda point are numerically investigated to realize the further development and high performance of new cryogenic superfluid cooling systems. It is found that the phase transition of the normal fluid to the superfluid and the generation of superfluid counterflow against normal fluid flow based on the thermomechanical effect is conspicuous in the large gas phase volume fraction region where the liquid to gas phase change with cavitation actively occurs. Furthermore, it is clarified that the mechanism of the He I to He II phase transition caused by the temperature decrease is due to the deprivation of latent heat for vaporization from the liquid phase.     

Stability Behavior of Liquid Jets under Gravity

The influence of gravity on the stability behavior of falling liquid strands without external excitation was investigated. To this end, a mathematic‐physical model was developed for the analysis of the stability behavior of liquid strands in the range of low to higher viscosity, the main emphasis being on gravity. The characteristics of the model are discussed and, finally, the stability criterion is derived for the quantitative determination of the point of disintegration.     

油肼—40C液体火箭燃料的应用研究

本文介绍了燃料替换中存在的低温互溶性和贮存性的研究,提出了一种对燃料油肼-40C分析化验的改进方法。利用这种方法很好地解决了油肼-40C代替混胺-02的应用技术问题。     

梅村特大桥跨既有京广线膺架过轨施工技术

针对梅村特大桥32 m 48 m 32 m连续梁上跨既有京广线施工情况,阐述了连续梁中跨膺架法过轨施工技术,重点介绍了膺架体系的布置、检算及吊装方法,指出鹰架体系具有很强的可操作性和安全性,值得推广使用。     

Electron diffraction and diffraction contrast imaging of thin organic films

The applications of electron diffraction and diffraction contrast electron microscopy with which to study the structure and dynamics of organic thin films are discussed. The techniques of making thin film deposits on substrates and of forming free-standing thin films over holes on the substrate are described. Selected area electron diffraction and diffraction contrast imaging techniques for thin film studies are elaborated, and examples are given. Methods to reduce radiation damage and environmental protection of the thin film specimen are outlined. The interpretation of electron diffraction and imaging data is given for three cases: (1) The effects of film tilting and molecular tilting (with respect to the film plane) are examined. (2) The detection of phase transition is illustrated. (3) The use of labels to mark film domains is shown together with the measurement of dynamic movement.