粉煤灰微珠化学镀银的研究

本文采用化学镀的方法对粉煤灰微珠表面进行镀银处理,制备出导电良好的银包粉煤灰微珠,且探讨了粉煤灰微珠粒径、镀银工艺参数对镀银效果和镀银微珠导电性能的影响。实验结果表明：粉煤灰微珠粒径越大,镀银效果越好;经每升含有30mLHF（质量分数36%）和10gNH4F的粗化液处理和每升含有3gAgNO3银氨活化液的处理的微珠镀银效果好;银氨镀液中AgNO含量应为8g/L,镀液的pH值应控制在10～11。     

镀银导电纤维的制备和性能

对短切聚酯纤维进行化学镀银,制备了用于导电高分子材料的导电填料,探讨了氨水浓度、装载量及稳定剂对纤维化学镀银的影响。实验表明,φ=0.10的氨水有利于化学镀银;通过调整装载量,可提高纤维的增重量率和硝酸银的利用率;稳定剂的加入可阻止镀液自分解,但对包覆层的均匀性和致密性有影响。电性能测试表明,镀银纤维的体积电阻率可达3.35×1-0 3Ω.cm,以其作为导电橡胶填料,当含量为w=0.40时,其电阻率为1.54×1-0 1Ω.cm。     

化学复合镀Ni——P—SiC合金的研究

研究了化学复合镀Ｎｉ－Ｐ－ＳｉＣ合金镀液组成、工艺和镀层性能。研究的结果表明，镀液中ＳｉＣ微粒含量为１０－１５ｇ．ｌ＾－１时，可得到性能较好、具有很高硬度的复合镀层。     

Ag80(WC70TiC30)17C3银基电接触材料化学镀的反应动力学

探讨银基电接触材料化学镀银反应过程中的动力学,利用酸度计测量反应过程中的pH值,从而直观地表示了化学镀银反应的速率.通过研究pH值随时间的变化规律,推导出了化学镀银反应动力学方程c=c₀e^-kt及反应的活化能E_a.     

化学镀Ni—P—B4C合金的研究

研究了化学复合镀Ｎｉ－Ｐ－Ｂ４Ｃ合金镀液的组成、工艺和镀层性能，研究的结果表明，镀液中的Ｂ４Ｃ微粒含量在１０－１５ｇ．ｌ＾－１时，能获得性能较好的镀层，且具有特别高的硬度。     

化学镀CoB薄膜动力学参数的回归分析

根据化学镀CoB薄膜试验得到镀液中反应物浓度、pH值、温度以及对应沉积速率．利用回归分析法，建立一元线性回归处理的数学模型和多元线性回归处理的数学模型．实验数据的拟合程度用相关系数R与剩余方差S来表征，借助于计算机编程运算，求出回归系数的估计值b0-3、估计值的置信区间、残差r、残差的置信区间rint分别确定上述诸因素所对应的反应动力学参数，并求出镀液中反应物浓度、pH值、温度与对应沉积速率的对数关系曲线表达式，导得了镀液沉积速率的方程式．优化了实验方案，确定了镀液的构成和工艺条件，成功制备了性能良好的合金镀层．     

化学镀镍-磷-金刚石镀液的老化与再生研究

采用常用电镀溶液的分析方法,研究了化学镀镍一磷一金刚石镀液老化情况,提出了一种新的化学镀液再生处理巩义,并对再生液与相同条件下原镀液进行了比较。新的化学镀液再生处理工艺为：氯化钙添加量为[Ca^2＋]／[（HPO）^2-]比为0．7-08;温度50±5℃;处理时间6小时。再生液与相同条件下原镀液性能相当,能够满足生产工艺要求。     

Ni-P化学镀高稳定性镀液及优化工艺

采用正交试验法研究了络合剂、稳定剂、pH值以及温度对镀层和镀液性能的影响，优选出高稳定性、长寿命的镀液组分及工艺。实验表明，该工艺稳定，镀液氯化钯稳定性实验时间大于580s，稳定常数为99％，使用寿命大于8周期，得到光亮、致密、外观平整的Ni-P镀层，镀层磷含量为8．58％，镀层沉积速度为20．94μm／h。     

CrCl3对酸性化学镀Ni-Cu-P镀液镀层性能的影响

研究了CrCl3对酸性化学镀镍铜磷合金溶液的稳定性、沉积速度以及镀层成分、表面断面形貌的影响，并与文献报道的其他Ni-Cu-P镀液的稳定剂进行了比较．结果表明：CrCl3能有效地抑制镍铜磷镀液的分解和铜在基体上的置换反应，得到更高铜含量的光亮镀层；随着CrCl3在镀液中含量的增加，沉积速度先升后降；CrCl3的加入使镀层中铜含量略微降低，镍磷含量增加；与其他稳定剂一样，CrCl3不改变沉积层的岛状表面形貌；断面形貌表明镀层仍保持致密．     

化学镀Ni-P-PTFE(聚四氟乙稀)的研究

在电镀液、化学镀液中加入非水溶性的固体颗粒使其与金属离子共沉积在镀件上,对改善镀层的使用性能具有特殊意义.PTFE对提高镀层的润滑性与耐磨性起重要作用[1、2].文章就化学镀Ni-P-PTFE镀液性质;镀液中PTFE含量对镀层的沉积速度,镀层中PTFE含量的影响,镀液的温度对沉积速度及镀层中PTFE含量的影响进行研究;对镀层的性能:孔隙率、成分、密度、硬度、镀层晶化温度、电化学特征参数等进行了测定,从而为实际应用提供了依据.     

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