高铅渣物理化学性能测定的偏差规律

为探明造成高铅渣物理化学性能测定中实际值与理论值偏差的原因,本研究配制了Pb O-Fe Ox-Ca OSi O_2-Zn O系渣。利用TG-DSC热重差热分析仪分析了不同组分含量熔渣的失重变化规律,采用FACTSage软件计算炉渣熔点、粘度,并与实验测定结果进行了对比,分析了性能偏差规律。研究结果表明,对w(Pb O)=20%~40%的中、高铅渣,熔渣在736~1 450℃时铅的挥发率大约15%~16%;当w(Fe O)/w(Si O_2)设置在1.29~2.05和w(Ca O)/w(Si O_2)=0.40时,实际测定的渣熔点与炉渣挥发后理论熔点之间的偏差(ΔT_(a-vv))介于+34~+190℃,实测粘度与理论粘度偏差(Δη_(a-vv))介于+0.17~0.32 Pa·s;而w(Ca O)/w(Si O_2)=0.80时,ΔTa-vi值较小,介于+3~+92℃,实测值更接近理论值。依据不同熔渣组分在给定温度下的挥发规律以及ΔT_(a-vv)和Δη_(a-vv)偏差结果,可以对给定的初始渣组分的实际熔点及粘度值进行预测,并可根据实测值来预测可能的渣组分。     

CaO-SiO_2渣系作用浓度的计算模型

根据炉渣结构的共存理论和CaO-SiO_2渣系相图制定了不同温度区间的作用浓度计算模型。在炼钢温度下计算结果表明,考虑2个硅酸盐(CaSiO_3和Ca_2SiO_4)或3个硅酸盐(CaSiO_3,Ca_2SiO_4和Ca_3SiO_5)的计算模型都是合用的。比较不同计算方案结果证明,用本文回归所得的热力学数据比用文献数据更能符合实际,所以对文献数据应进一步研究。硅酸盐作用浓度的最大值与相图中固液相同成分熔点的位置一致,说明硅酸盐对本渣系的熔点具有极为重要的影响,炉渣总质点数随碱度而变化中出现最小值的原因是炉渣中进行了多个结构质点结合成一个分子的反应。     

一阶随机系数混料回归模型的D-最优设计

通过对一阶二分量随机系数混料回归模型变式,转变成混合效应混料回归模型,从而得到其信息矩阵.对一阶二分量随机系数混料回归模型,求出其单纯形-中心设计的D-最优设计和G-最优设计.在此基础上,证明一阶二分量随机系数混料回归模型不具有D-最优设计和G-最优设计等价性.     

广西高铁铝土矿中间渣的性质变化规律

通过对广西高铁铝土矿中间渣的成分和性质的分析,解析了其成分及性质的变化规律.广西高铁铝土矿烧结试验数据分析表明:广西高铁铝土矿所产生中间渣的熔化性温度比普通渣的温度高,粘度也增高,若使用碱性烧结矿更有利于成渣.由于Al2O3/SiO2高,炉渣在CaO-Al2O3-SiO2体系中熔点低,流动性好的区域内进行冶炼,同时炉渣的粘度会增加,这要求加入CaO来降低粘度.另一方面,高Al2O3增大了对炉渣碱度的要求,炉渣碱度应相应提高.     

金川电炉渣物理化学性质测定

本文叙述了金川有色金属公司电炉渣的粘度、表面张力、密度、电导及熔点等物理化学性质的测定方法,并以图表形式列出了十五个现场生产渣样的测试结果。以测试数据和文献资料为依据,讨论了炉渣的这几种物理化学性质与炉渣组成的关系。测定结果表明,金川电炉渣的物化性能基本上能满足电炉冶炼的要求。     

Al_2O_3对镍电炉渣粘度的影响

用内旋转式粘度计测定研究了向某炼镍厂电炉渣和模拟镍电炉熔炼的原料中添加质量分数为6946%Al2O3和475%Ni的高铝镍物料时,对炉渣粘度的影响·结果表明,该炼镍厂电炉渣在1340℃时粘度为0538Pa·s;电炉渣在不添加任何其他试剂的情况下,渣中w(Al2O3)不宜高于9%;加入添加剂后,炉渣粘度降低,当在配料中加入20%的此种含镍物料时,添加剂加入量7%为宜,此时炉渣粘度为074Pa·s(1350℃),满足电炉熔炼对炉渣粘度的要求·     

烷基咪唑双-三氟甲烷磺酰亚胺室温熔盐物理化学性质的人工神经网络模型训练

利用分子路径指数矢量表示出室温熔盐阳离子的结构,采用误差反向传播人工神经网络模型对烷基咪唑双-三氟甲烷磺酰亚胺室温熔盐的物理化学性质进行了数值处理,给出了室温熔盐阳离子结构和它们物理化学性质之间的关系.室温熔盐结构与熔点的关系:熔盐熔点随着取代基团链的增长而下降;熔盐分子对称性越好,熔点越高;R2位上的取代基团使得熔盐熔点上升;R4上的取代基团使得熔盐熔点下降.室温熔盐结构与密度的关系:熔盐的密度随着N 烷基链长的增加而呈线性减小(R>0.99);取代基在R4位上的分子比在R2位上的熔盐密度低;如果R2上没有取代基团,R4上有取代基会使熔盐密度降低.室温熔盐结构与粘度的关系:R2位上的取代基团使得熔盐粘度上升,R4位上的取代基团会使熔盐粘度下降.室温熔盐结构与电导率的关系:R2位取代基团使得熔盐电导率下降;R2上无取代基团时,R4的取代基团使得熔盐电导率上升.这些规律对设计不同物理化学性质的室温熔盐分子具有很好的指导作用.     

CaF_2对碱性中间包覆盖剂物性参数的影响

本论文通过测定覆盖剂各配方的熔点、熔化速度,粘度,做出熔点、熔速、粘度与CaF2的关系曲线,分析CaF2对覆盖剂熔点、熔速和粘度的影响。     

含氟稀土渣的粘度(包头矿综合利用基础研究之一)

本文包括对包头含氟稀土炉渣粘度的研究,分别测定了不同碱度,不同含氟量,不同炭化硅与碱金属含量,特别是不同稀土氧化物含量的炉渣粘度。研究结果与生产实践情况基本上一致:即增加炉渣中稀土与炭化硅含量,使炉渣度升高;但是增加炉渣中氟化钙与碱金属含量,使炉渣粘度降低;不过碱度对稀土炉渣的影响存在一个最低值范围,当炉渣碱度低于或高于这个范围时都使粘度升高。上述研究结果,对于高炉冶炼稀土合金,高炉冶炼稀土富渣(即包钢的二流程)与电炉冶炼稀土硅铁合金都有一定的参考价值。     

离子液体[C_3CNmim][BF_4]与AN二元体系的热力学性质、超额性质及氢键作用

制备了一种新型的1-氰丙基-3-甲基咪唑四氟硼酸盐离子液体([C_3CNmim][BF_4])与乙腈(AN)的全浓度二元混合体系.在大气压力下,分别在288.15 K,298.15 K,308.15 K和318.15 K温度条件下测定了全浓度二元混合体系的密度、粘度、电导率等热力学性质,并根据密度值及经验方程计算了二元混合体系的超额摩尔体积,讨论了体系的超额摩尔体积与组分、温度之间的变化关系.另外,还根据Vogel-Fulcher-Tamman(VFT)方程对二元混合体系的动态粘度、电导率进行拟合,并对体系的动态粘度、电导率的对温度的依赖性进行了描述,计算出了VFT可调经验参数.最后,通过密度泛函理论计算了离子液体与溶剂分子间的作用能,并且讨论了二元体系内部氢键的相互作用.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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