高氯废水对TOC测定的影响

通过对含有不同氯化物浓度的废水中TOC的测定,研究不同浓度的氯化物含量对TOC测定的影响,以及高氯废水中TOC测定的一些技术要求。实验结果表明高氯化物含量对水样样品TOC测定值基本无影响,测定中可以不考虑氯化物对TOC测定的干扰。     

浅淡热力设备水汽样品中活性硅测定的误差来源

主要介绍水汽样品中活性硅测定结果在电厂热力系统热力设备运行中的重要性。从活性硅测定方法原理和测定操作步骤等方面详细分析了在利用钼蓝比色法测定水汽样品中活性硅时，在测定过程中误差的来源以及在测定过程中注意事项，提高活性硅测定结果的准确度，更好为指导电厂热力设备安全、经济、稳定地运行提供可靠数据。     

关于煤中磷的测定方法比较

从用磷钼蓝分光光度法测定煤中磷的环节入手，阐述了两种测定煤中磷方法的比较，以提高测定的准确度和工作效率。     

不同粉碎方法对植物多酚测定的影响

就目前植物多酚测定过程中不同的粉碎方法对测定结果的影响进行了研究。结果发现,在氮气保护下粉碎的样品,其测定结果较在空气中粉碎的样品小,并且这两种不同的粉碎方式对测定结果有显著的影响。因此,建议在植物多酚的测定过程中,尽量采用氮气保护的方式,或者在低温的环境中进行,从而使测定的结果更加接近植物内的真实含量。     

对一次性无纺布制品甲醛含量测试方法的研究

目的:比较不同的制样方法对一次性无纺布产品甲醛含量测定结果的影响。方法:依据GB/T2912.1-2912.2-1998《纺织品甲醛的测定》中方法测定,采用分光光度法测定,检测波长为412 inn。结果:不同的制样方法,测定甲醛含量有不同的结果。结论:纺织品中甲醛含量测定应当更加明确制样方法,以使检测结果准确可靠。     

硅灰石中二氧化硅含量的测定

本文指出可利用“高硅钢中二氧化硅含量测定方法”来测定硅灰石中二氧化硅含量,测定结果是可靠的.     

氟化铝钠含量的火焰原子吸收光谱法测定

由于氟化铝的特殊性质,使得在实际测定氟化铝中钠含量时并不容易,但在工业生产中,测定氟化铝中钠含量又具有十分重要的意义。本文主要是简单介绍一下如何用火焰原子吸收光谱法去测定氟化铝中钠的含量以及它的可行性研究。     

污水中酚类和芳胺类的同时测定

用四阶导数光谱法同时测定污水中的酚类和芳胺类的新方法,这种方法不需要蒸馏、萃取、显色等繁杂过程,只需在pH为2.5的盐酸介质中进行.两者互不干扰测定.实验证明,石油类、悬浮物、硫化物等均不干扰测定.本法对酚类和芳胺类测定的线性范围宽、检出限量低、回收率好,并有操作简便、省时省力、选择性好等特点.污水样品中酚类测定的结果与4—AAP法的测定结果一致,芳胺类的测定结果与萘乙二胺偶氮比色法的测定结果基本吻合.本方法尤其适用于油矿区污水的测定.     

电感耦合等离子发射光谱-质谱法测定土壤中镓的方法研究

电感耦合等离子发射光谱-质谱法测定土壤中镓的方法研究,主要探讨了土壤样品中镓测定的前处理条件及测定条件,通过不同浸提时间、不同提取液浓度条件的研究得出了比较理想的定量分析条件,采用该方法测定土壤中镓,操作简便,检出限、准确度、精密度均能达到要求。     

溴酸银溶度积的测定

溶度积的测定具有重要意义.针对实验课本中缺乏相关测定实验内容或有的课本中虽然有实验，但实验结果不理想等情况，设计出“溴酸银溶度积的测定”实验，所得数值与课本所列数值比较接近.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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     

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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