铅蓄电池中Pb-Sb合金的正极腐蚀特性

通过稳态恒电位极化曲线测量方法,发现Ｐｂ－Ｓｂ合金与纯Ｐｂ的恒电位腐蚀特性有着至关重要的差别：在ＰｂＯ２／ＰｂＳＯ４电极平衡电位附近区域,纯Ｐｂ表现出为人们所熟知的腐蚀反应活化现象,而Ｐｂ－Ｓｂ合金却仍能保持高度钝化状态,说明合金中的Ｓｂ能够有效地抑制该电位区Ｐｂ腐蚀反应活化的倾向;而在除此之外的宽广电位区间内,两者之间的差别远没有如此明显．该活化电位区两者腐蚀特性如此显著的差异决定了Ｐｂ－Ｓｂ合金在多数情况下耐腐蚀性会优于纯Ｐｂ．不同极化条件下Ｐｂ和Ｐｂ－Ｓｂ合金腐蚀速率的实验测试结果证实了上述观点．     

Pb－Sn（10％）合金镀层形成条件的研究

用电化学方法研究了抗氧剂、光亮剂、整平剂对Ｐｂ－Ｓｎ（１０％）合金镀层形成的影响．评价了镀液温度、ｐＨ及电流密度对Ｐｂ－Ｓｎ（１０％）合金性能的影响，给出了适用于氨基磺酸镀液体系电镀Ｐｂ－Ｓｎ（１０％）合金的抗氧剂、光亮剂及最佳电镀工艺条件．     

Fe25Cr20Ni合金在H_2S－H_2中的高温硫化行为

使用连续称重装置和非连续称重装置对Ｆｅ２５Ｃｒ２０Ｎｉ合金在Ｈ２Ｓ－Ｈ２气氛中的高温硫化行为进行了研究。结果表明：这种合金的硫化行为遵循抛物线规律，腐蚀产物有３层：最外层（称ＯＬ－Ⅱ层）由Ｆｅ－Ｎｉ－Ｓ系统组成；中间层（称ＯＬ－Ⅰ层）由Ｆｅ－Ｃｒ－Ｓ系统组成；内硫化层（Ｓｕｂｓｃａｌｅ）由一些弥散的硫化物相组成，标记实验的结果表明：合金在硫化过程中，腐蚀产物最外两层的生长是由金属离子向外扩散控制，而内硫化层的生长是由分解机理控制。     

铅铈和常用板栅合金在硫酸溶液中生长的阳极膜的比较

用伏安法研究在４．５ｍｏｌ．ｄｍ＾－３Ｈ２ＳＯ４溶液中的Ｐｂ－Ｃｅ（ｘ（Ｃｅ）＝１％）合金上生长的阳极膜,并与Ｐｂ－Ｓｂ（ｘ（Ｓｂ）＝７％）和Ｐｂ－Ｃａ－Ｓｎ（ｘ（Ｃａ）＝０．５％,ｘ（Ｓｎ）＝１．５）两常用板栅合金的作比较,实验结果表明,Ｐｂ－Ｃｅ合金上生长的α－ＰｂＯ２和Ｐｂ（ＩＩ）氧化物的生长速率均显著低于Ｐｂ－Ｃａ－Ｓｎ的,但高于Ｐｂ－Ｓｂ,也即Ｐｂ－Ｃｅ的耐腐蚀性优于Ｐｂ－Ｃａ－Ｓｎ,但     

烧结温度对PSBN铁电陶瓷介电性能的影响

用普通的电子陶瓷工艺制备了ＰｂＯ－ＳｒＯ－ＢａＯ－Ｎｂ２Ｏ５（ＰＳＢＮ）系统民陶瓷，研究了ＰＳＢＮ系统铁电陶瓷的介电性能与烧结温度的关系，ＸＲＤ分析表明：ＰＳＢＮ系统铁电陶瓷的主晶相是Ｐｂ０．７Ｂａ０．３Ｎｂ２Ｏ６（ＰＢＮ）、Ｓｒ０．５Ｂａ０．５Ｎｂ２Ｏ６（ＳＢＮ）和Ｂａ０．２７Ｓｒ０．７５Ｎｂ２Ｏ５．７８（ＢＳＮ），将这一复杂的化学系统看作三元系固熔体，其中ＰＢＮ、ＳＢＮ和ＢＳＮ各相比例随烧结温     

Cu（Ⅱ）,Pb（Ⅱ）,Zn（Ⅱ）,Cd（Ⅱ）痕量金属离子的浮选分…

以焦磷酸根（Ｐ２Ｏ７＾４－）为配体，二六烷基三甲溴化铵（ＣＴＭＡＢｒ）为鼓泡剂，对Ｃｕ（Ⅱ），Ｐｂ（Ⅱ），Ｃｄ（Ⅱ）等４种金属离子的浮选分离进行了研究。讨论了ｐＨ值，氮气流速、Ｐ２Ｏ７＾４－的浓度、ＣＴＭＡＢｒ的浓度、金属离子浓度对浮选率的。到了其最佳分离条件，对Ｃｕ（Ⅱ）－Ｃｄ（Ⅱ），Ｐｂ（Ⅱ）－Ｃｄ（Ⅱ），Ｚｎ（Ⅱ）－Ｃｄ（Ⅱ）等二元组分进行了较好的分离。     

Cu（Ⅱ），Pb（Ⅱ），Zn（Ⅱ），Cd（Ⅱ）痕量金属离子的浮选分离法研究

以焦磷酸根（）为配体，十六烷基三甲溴化铵（ＣＴＭＡＢｒ）为鼓泡剂，对Ｃｕ（Ⅱ），Ｐｂ（Ⅱ），Ｚｎ（Ⅱ），Ｃｄ（Ⅱ）等４种金属离子的浮选分离进行了研究。探讨了ｐＨ值、氮气流速、的浓度、ＣＴＭＡＢｒ的浓度、金属离子浓度对浮选率的影响．找到了其最佳分离条件，对Ｃｕ（Ⅱ）－Ｃｄ（Ⅱ），Ｐｂ（Ⅱ）－Ｃｄ（Ⅱ），Ｚｎ（Ⅱ）－Ｃｄ（Ⅱ）等二元组分进行了较好的分离。     

Pb—Sn（10%）合金镀层形成条件的研究

用电化学方法研究了抗氧剂、光亮剂、整不剂对Ｐｂ－Ｓｎ合金镀层形成的影响。评价了镀液温度、ｐＨ及电流密度对Ｐｂ－Ｓｎ合金性能的影响，给出了适用于氨基磺酸镀液体系电镀Ｐｂ－Ｓｎ合金的抗氧剂、光亮剂及最佳电镀工艺条件。     

管线钢焊缝的应力腐蚀破裂研究

观察国产ＷＸ５２及日本产Ｔ／Ｓ５２Ｋ管线钢在硝盐介质中应力腐蚀开裂（ＳＣＣ）现象，比较了母材与焊缝应力腐蚀敏感性差别，探讨了腐蚀介质温度的影响．试验表明：两种管线钢焊缝在未进行改善处理的情况下，焊缝比母材临界应力腐蚀开裂应力σｃｒ将近降了一半；温度越高，应力腐蚀敏感电位区间越宽．为了提高焊缝抗应力腐蚀能力，在ＷＸ５２管线钢埋弧焊焊缝中渗入微量Ｔｉ、Ｂ、稀土Ｙ等合金元素．结果表明：加入这些合金元素都能使得焊缝组织得到改善，减少晶界先共析铁素体，使应力腐蚀通道受到阻碍和限制，影响电化学效应，提高ＷＸ５２管线钢焊缝在硝盐介质中的应力腐蚀抗力     

Fe－Mn－Si－Cr形状记忆合金的耐腐蚀性能

通过腐蚀重量法实验及电化学测试，研究了Ｆｅ－Ｍｎ－Ｓｉ－Ｃｒ形状记忆合金的耐腐蚀性能，并与Ｆｅ－Ｍｎ－Ｓｉ形状记忆合金及１８－８铬镍不锈钢的耐腐蚀性能作了比较。结果表明，Ｆｅ－Ｍｎ－Ｓｉ－Ｃｒ合金的耐腐蚀性能明显高于Ｆｅ－Ｍｎ－Ｓｉ合金，在Ｆｅ－Ｍｎ－Ｓｉ－Ｃｒ合金中随着铬含量的增加，其耐腐蚀性能也相应提高。     

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     

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