热浸镀富铈稀土铝合金的耐腐蚀性研究

研究了富铈稀土对碳钢热浸镀铝合金组织及耐腐蚀性的影响。结果表明，在稀土含量为0．1％．0．5％范围内随着稀土含量的增加热浸镀层组织均匀，当稀土含量超过0．5％时扩散层厚度明显减小，稀土含量0．3％的热浸镀层具有最好的组织，并且在酸性介质腐蚀条件下具有最好的耐腐蚀性。含0．3％稀土的热扩散层的耐腐蚀性比纯铝提高2～3倍。     

气相色谱法同时测定饮用水中多种有机氯及拟除虫菊酯类农药残留量

气相色谱法同时测定水中多种有机氯及拟除虫菊酯类农药。对水质监测分析结果：有机氯农药的检测限0．001-0．003μg·mL^-1,拟除虫菊酯类农药检测限0．008～0．02μg·mL^-,线性相关系数0．9978～0．9999。用石油醚-正已烷（3＋1）提取,有机氯农药回收率94．2％-124．0％,相对标准偏差为3．27％。8．78％（n=5）;拟除虫菊酯类农药回收率95．2％-118．3％,相时标准偏差为5．70％～7．12％（n=5）;方法用于水样品中农药残留测定,结果满意。     

组合式生物脱氮除碳法处理尼龙6废水

用包含水解酸化、硝化和反硝化三个反应器的组合式生物脱氮除碳系统处理尼龙6废水，着重分析了该系统的回流比，溶解氧。结果显示系统的最佳工艺参数为：回流比为3，反应器的溶解氧分别为0．5-1．0mg·L^-1、3．0-3．3mg·L^-1、1．8-2．3mg·L^1、，同时CODcr和TN，的去除率分别为95．85％、61．04％。     

青藏龙胆花中多糖含量的测定

用苯酚-硫酸比色法首次对龙胆花中多糖含量进行测定，测定波长490nm，多糖换算因素f=5．07。从0．002mg／ml-0．02ms／ml呈良好的线性关系，r=0．9998。回收率在97．4％-102．3％之间，精密度RSD％=1．16％。     

化学连续浸提法对土壤中Zn和Mn化学形态的研究

用化学连续浸提法研究不同土壤类型、不同pH值条件下,土壤中Zn和Mn的形态分布,并对方法的精密度和准确度进行系统评价．结果表明,化学连续浸提法精密度小于10％,回收率为94．0％～107．3％．随着土壤pH的变化,土壤中各形态对Zn,Mn呈现有规律变化,土壤类型的变化对Zn的形态分布影响不大,但对Mn的形态分布具有显著影响．     

液相色谱一串联质谱法测定大鼠血浆中的曲普瑞林

建立了液相色译串联质谱法测定血浆中曲普瑞林的方法．以奥曲肽为内标,采用蛋白沉淀方法进行样品处理．色谱分离使用AgilentEclipsePlusC18 RRHD（50×2．1mm,1．8μm）色谱柱,流动相为甲醇（0．1％甲酸）-水（0．1％甲酸）梯度洗脱．血浆样品用简单的沉淀法进行预处理．奥曲肽作为内标．使用三重四级杆串联质谱仪采用正离子方式多反应检测．曲普瑞林在0．100—30．0 ng·mL-1 范围内线性关系良好,相关系数r为0．9980．方法的低、中、高3个浓度的日内精密度（RSD）分别为3．5％、2．2％和3．3％．日间精密度分别为1．3％、3．0％和3．6％．本方法专属性好、灵敏度高,操作简便,精密度和准确度均满足检测要求．     

泡沫A1-0．146wt．％Ti合金的制备及耐腐蚀性能研究

采用真空低压渗流铸造法,制备了泡沫A1-0．146wt．％Ti合金．分析了影响渗流法制备泡沫铝合金的主要因素,得到了制备泡沫合金的最佳条件：NaCl填料粒子预热温度300℃,合金液体浇铸温度760℃,填料粒子尺寸1～3mm．不同孔率泡沫AI-O．146wt．％Ti合金的模拟海水全浸实验结果表明：泡沫合金的耐腐蚀性能随着孔率增加显著下降．     

乌兰察布地区油菜无公害生产技术

1．1品种选择四月慢、五月慢、上海青帮。1．2种子处理根据病害种类选其一。a．用种子重量的0．3％的25％甲霜灵可湿性粉剂拌种(防霜霉病)。b．用种子重量的0．4％的50％福美双可湿性粉剂拌种或用种子重量的0．2％～0．3％的50％扑海因可湿性粉剂拌种(防黑斑病、炭疽病)。c．用农抗751按种子量的1％～1．5％拌种(防软腐病)。     

圆盖阴石蕨黄酮类化合物的研究

样品经75％乙醇抽提，以芦丁为标准用A1(NO3)3显色法于510nm下测定了圆盖阴石蕨中总黄酮的含量．结果表明：A1(NO3)3显色法测定该物质黄酮含量的显色稳定性和重复性良好，且附生于10种不同树上的圆盖阴石蕨(地上和地下部分)中黄酮含量有差异，地下部分的变幅为0．23％-1．34％，地上部分为0．595％-3．508％，显示出含量与不同附主有一定的相关性．     

火焰原子吸收光谱法测定花生中铜和锌

本文用火焰原子吸收光谱法在同一体系中连续测定花生中铜和锌，方法快速简便，RSD为0．77％-0．81％，回收率98．0％-99．3％。     

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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