中间包镁质涂料轻质化研究

研究了两种不同长度和直径的纤维对降低涂料体积密度的效果。试验结果表明，加入纤维能使镁质中间包涂料的体积密度大幅度地降低，有机发泡剂的加入能够进一步降低涂料的体积密度及干燥收缩；蓝晶石能有效地抑制涂料的高温收缩。     

碳复合镁铝尖晶石材料在整体塞棒棒身中的应用

采用含有镁铝尖晶石的碳复合耐火材料作为钢铁连铸用整体塞棒的棒身材质，研究了其对中间包覆盖剂的抗侵蚀性能，分析了耐侵蚀机理。结果表明，镁铝尖晶石与熔融中间包覆盖剂反应生成CaMgSiO4，封闭部分气孔，阻止熔融覆盖剂的渗透，是塞棒棒身耐侵蚀性增强的原因。开发出性能优良的高耐蚀性整体塞棒，对其工业化应用的效果进行了评价。     

东北大学冶金反应工程学理论研究取得重要进展

东北大学冶金传输和反应工程研究室肖泽强教授和他的课题组在中间包冶金反应工程学研究中,提出了中间包非等温新观点,受到国内外学术界的高度重视·近年来我国钢铁生产技术迅速发展的主要特征之一是钢连铸工艺的广泛应用·在钢的连铸工艺中,中间包作为连接钢包和连铸机的反应器,对连铸过程的顺利进行和最终产品的质量有着重要影响·自50年代连铸技术开始用于钢的浇铸以来,冶金工程技术和研究人员对中间包设计、控制以及对包内过程做过大量的研究·80年代初,加拿大学者蒙格利总结归纳了这些研究成果,提出了一个新学科:中间包冶金学·以前所有…     

连铸中间包水仿真模型数据采集系统的研制

为了研究冶金连铸中间包流场的流动过程,在唐钢薄板连铸中间包水模型数据采集系统中,开发了基于单片机技术的在线电导率分析仪和上位机数据采集软件,可以有效的记录、计算、分析中间包内流体的流动过程.     

连铸中间包水仿真模型数据采集系统的研制

为了研究冶金连铸中间包流场的流动过程,在唐钢薄板连铸中间包水模型数据采集系统中,开发了基于单片机技术的在线电导率分析仪和上位机数据采集软件,可以有效的记录、计算、分析中间包内流体的流动过程.     

炼钢厂连铸钢水温度预报模型

应用神经网络建立连铸钢水温度预报模型，重点研究了转炉出钢到中间包浇铸区间的度变变化，确定钢水温降与其影响因素之产是的非线性映射关系，本模型能校确地预报连铸钢水温度。     

连铸中间包分流挡渣实验研究

在中间包流场分布分析的基础上，借助水模拟试验研究了6流小方坯连铸中间包内钢水流动规律。通过设置分流挡渣墙改进中间包内的钢水流动，分离钢水和炉渣，提高钢中夹杂物的上浮率，达到了预期的效果，并应用于生产实践．     

水平连铸中间包流动特性的模拟研究

浇注过程中钢水在中间包内的流动特性对中间包的设计、工艺操作和铸坯质量都有重要影响。本文结合马钢水平连铸7.5t中间包,模拟研究了中间包内液体流动行为和平均停留时间分布规律。在生产中应用结果证明对夹杂物的去除有明显的效果。     

连铸中间包钢水夹杂物浓度的数值模拟

以宝钢二连铸50t"T型"中间包为研究对象,采用有限差分方法,计算了中间包的三维流场、温度场及量纲为1的夹杂物浓度的分布,分析了中间包的内部结构、中间包钢水液面高度及夹杂物当量直径对夹杂物排出率的影响.结果表明,双坝、堰"T型"中间包对夹杂物上浮十分有利.     

单流板坯连铸中间包结构优化

通过对单流板坯连铸中间包的水模实验,研究了不同控流装置对中间包流动特性的影响.研究结果表明,堰、坝的尺寸和位置与湍流控制器(TI)的结构对中间包流动特性影响很大,在该中间包内使用不带顶檐的湍流控制器效果好于带顶檐的湍流控制器.与原方案中间包结构相比,优化后的中间包的流体流动特性得到很大改善,最小停留时间和峰值时间分别从64s和81 s提高到了81 s和163 s,平均停留时间从237s延长到了314 s,死区体积分数从35%降低到了14%,降低了60%.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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