氨基酸对A3钢的缓蚀作用及机理研究

考察了由豆类水解所得复合氨基酸对Ａ３钢的缓蚀作用。实验表明：在常温下盐酸介质中,当缓蚀剂＜１．０％时,抑制系数为ｌｇｒ＝２．４１＋０．４６ｌｇＣ主要表现为抑制阴极过程,呈现负催化效应。当添加量＞１．０％,腐蚀电位开始正移。体系升温后,缓蚀作用主要表现为阻止阳极溶解。     

不锈钢在高温盐酸中的酸洗缓蚀抑雾剂

采用失重法和大气采样装置，筛选出两种高温、高浓度盐酸酸洗不锈钢的缓蚀抑雾剂复合配方。测定了它们在70℃─90℃温度下，20％HCl中对3Cr13不锈钢的缓蚀抑雾效果。结果表明，两种缓蚀抑雾剂均有较强的抑制腐蚀和酸雾的作用。     

海水介质中环境友好型紫铜缓蚀剂的缓蚀性研究

采用失重法、极化曲线、电镜扫描和XPS能谱分析等方法对苯并三氮唑（BTA）及其复合缓蚀剂对海水中紫铜的缓蚀性能及缓蚀机理进行了研究。实验结果表明：单独使用BTA浓度达到150mg·L^-1时，缓蚀率大于90％；BTA与柠檬酸钠复配后，缓蚀率有了很大提高，当BTA浓度为2mg·L^-1，柠檬酸钠浓度为20mg·L^-1时，缓蚀率达到96．0％，腐蚀速率为0．01014mm／a，缓蚀剂成本大大降低。极化曲线试验结果表明，PGA缓蚀剂在海水中为阴极型缓蚀剂，BTA与柠檬酸钠复合缓蚀剂为混合型缓蚀剂。对添加了缓蚀剂的海水中的紫铜表面进行的扫描电镜测试及XPS能谱分析的实验结果表明：添加了BTA和柠檬酸钠缓蚀剂的紫铜表面光滑，基本没有腐蚀；且在试片表面形成了缓蚀剂各组分均参与成膜的非水溶性保护层，有效的抑制了紫铜在海水中的溶解腐蚀。     

酸度对A3钢在CO2的3%NaCl溶液中的腐蚀影响及缓蚀研究

利用失重法和电化学方法研究了酸度对Ａ３钢在ＣＯ２的３％氯化钠溶液中的腐蚀影响和咪唑类缓蚀剂ＨＡ,ＨＢ的缓蚀及缓蚀机理。结果表明：酸度对Ａ３钢在ＣＯ２的３％氯化钠溶液中腐蚀影响较大,与ＨＡ,ＨＢ的缓蚀效果差不多,是以控制阴极为主的混合型缓蚀剂。     

松香胺环氧乙烷缓蚀作用的研究

<正>利用失重法测定腐蚀速率,研究松香胺环氧乙烷(RAO)在不同温度、不同浓度下对A_3钢在1N盐酸中缓蚀作用机理。研究结果表明;RAO的缓蚀机理为化学吸附作用;RAO在低温(40℃以下)满足Langmuir吸附,但在高于60℃时不满足Langmuir吸附规律;RAO是一种强烈抑制阴极过程的阴极型缓蚀剂。     

海水介质中环境友好型紫铜缓蚀剂的缓蚀性研究(英文)

采用失重法、极化曲线、电镜扫描和XPS能谱分析等方法对苯并三氮唑(BTA)及其复合缓蚀剂对海水中紫铜的缓蚀性能及缓蚀机理进行了研究。实验结果表明:单独使用BTA浓度达到150mg·L-1时,缓蚀率大于90%;BTA与柠檬酸钠复配后,缓蚀率有了很大提高,当BTA浓度为2mg·L-1,柠檬酸钠浓度为20mg·L-1时,缓蚀率达到96.0%,腐蚀速率为0.01014mm/a,缓蚀剂成本大大降低。极化曲线试验结果表明,BTA缓蚀剂在海水中为阴极型缓蚀剂,BTA与柠檬酸钠复合缓蚀剂为混合型缓蚀剂。对添加了缓蚀剂的海水中的紫铜表面进行的扫描电镜测试及XPS能谱分析的实验结果表明:添加了BTA和柠檬酸钠缓蚀剂的紫铜表面光滑,基本没有腐蚀;且在试片表面形成了缓蚀剂各组分均参与成膜的非水溶性保护层,有效的抑制了紫铜在海水中的溶解腐蚀。     

缓蚀剂与锑配合物的协同作用研究

以三氯化锑、乙二胺四乙酸等为原料合成了EDTA-锑配合物,采用静态挂片失重法和电化学方法考察了EDTA-锑与曼尼希碱的协同缓蚀作用.结果表明:在复合缓蚀剂用量不变的情况下,N80钢片在工业盐酸中的腐蚀速率随EDTA-锑与曼尼希碱质量比的增大呈现出先减小后增大的趋势.复合缓蚀剂的加量为1%,实验温度为90℃,在15%盐酸中,当EDTA-锑与曼尼希碱质量比为0.5%时,腐蚀速率最小;在20%盐酸中,当EDTA-锑与曼尼希碱质量比为1.0%时,腐蚀速率最小.电化学测试表明,EDTA-锑与曼尼希碱组成的复合缓蚀剂是以抑制阴极为主的混合型缓蚀剂.     

松香酰胺基多巴胺的合成及缓蚀性能评价

以松香和多巴胺为原料合成了一种新型油田注水缓蚀剂——松香酰胺基多巴胺。考察反应物配比和反应时间对产率的影响;利用静态失重法评价其缓蚀性能并通过电化学、吸附热力学及扫描电镜对其作用机理进行研究。实验结果表明,松香酰胺基多巴胺的最佳合成条件为:室温下,松香与多巴胺的摩尔比为1∶1.20、反应时间为24 h;在60℃下,矿化度为54 303 mg/L的腐蚀介质中当缓蚀剂质量浓度为150 mg/L时,N80钢片的腐蚀速率降至0.062 1 mm/a,缓蚀率达65.97%。电化学测试表明了该缓蚀剂属于抑制阴极型为主的混合型缓蚀剂,在金属表面的吸附自发进行,吸附符合Frumkin等温式,吸附类型为化学吸附。     

盐酸介质中咖啡因在冷轧钢上的吸附及缓蚀作用

利用失重法和塔菲尔极化曲线方法研究了盐酸介质中咖啡因对冷轧钢的缓蚀作用．结果表明：咖啡因对冷轧钢在0．5moL／L盐酸溶液中的腐蚀有着良好的抑制作用，缓蚀率随咖啡因浓度增加而升高；在一定浓度范围内随着温度升高而增加；其在冷轧钢表面吸附基本符合Langmuir等温式．咖啡因对钢在盐酸中的阳极反应和阴极反应均有抑制作用，但主要是通过抑制阴极反应而起到缓蚀作用。     

含氮有机缓蚀剂JZH-1的研究

合成了一种含氮有机化合物JZH-1,采用失重法和电化学方法测定了其在盐酸溶液中对碳钢的缓蚀效果．结果表明：JZH1对45^#钢在浓盐酸中的腐蚀有较好的缓蚀作用,是一种高效缓蚀剂．该缓蚀剂可同时抑制45^#钢在盐酸中腐蚀的阴极过程与阳极过程,是混合型缓蚀剂．     

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

正~~