土壤中有效磷的快速测定

用ｃ（ＮＨ４Ｆ）＝０．０１５ｍｏｌ／Ｌ的ＮＨ４Ｆ和ｃ（ＨＣｌ）＝０．３ｍｏｌ／Ｌ的ＬＣｌ提土壤样品中有效磷,以钼锑抗分光光度法测定有效磷的含量。在ｃ（Ｈ２ＳＯ４）＝０．２～０．３ｍｏｌ／Ｌ的Ｈ２ＳＯ４和Ｓｂ＾３＋存在下,到与钼酸铵反应形成磷锑钼杂多酸,该杂多酸在常温下被抗坏血酸还原为磷钼蓝络合物,它的最大吸收波长于７００ｎｍ处,磷量在０．１～１４００μｇ／Ｌ内服从比尔定律,检出限为０．０２４μｇ／     

一种适合常规分析的氨氮测定方法

采用预蒸馏纳氏试剂吸光光度法测定污水中的氨氮,以Ｈ３ＢＯ３ 溶液作吸收剂时,有色胶体的稳定性较差,加入ＮａＯＨ溶液可提高胶体的稳定性。当ＮａＯＨ 溶液（１ ｍｏｌ／Ｌ）与Ｈ３ＢＯ３ 溶液（２ ％） 的体积相同时,有色胶体稳定时间最长。加入胶体保护剂聚乙烯醇（ＰＶＡ） 可进一步提高胶体的稳定性和测定准确度。对Ｈ３ＢＯ３ ,ＮａＯＨ 和ＰＶＡ 的影响规律进行了研究,提出了最佳实验条件：以２％ Ｈ３ＢＯ３ 溶液作吸收液,１ ｍｏｌ／ＬＮａＯＨ 溶液１０ ｍＬ,罗谢尔盐溶液１．００ ｍＬ,５％ 聚乙烯醇０．１６ ｍＬ,纳氏试剂１ ．００ ｍＬ,反应１０ ｍｉｎ。该方法的最低检出限为０．０１５ ｍｇ／Ｌ,回收率为９８ ．６％ ～１０３％ ,适用于环保站、化工厂进行的常规分析     

聚铝处理低浓度SO_2烟气的研究

研究了以聚合硫酸铝为吸收剂处理低浓度ＳＯ２烟气的工艺条件,通过吸收和解吸,达到富集ＳＯ２的目的．考察了聚合硫酸铝浓度、盐基度、吸收温度以及解吸温度等因素对吸收和解吸过程的影响．结果表明,聚合硫酸铝溶液对ＳＯ２具有较高吸收率和解吸率,并可多次循环使用．     

Cl~- 和 SO_4~(2-) 对厌氧废水处理的抑制阈值

用人工配制高浓度有机废水分别研究了Ｃｌ－和ＳＯ２－４对厌氧生物废水处理的抑制作用和抑制阈值．在全混流厌氧恒化器和上流式厌氧污泥床（ＵＡＳＢ）反应器中分别得到了对厌氧消化基本无抑制作用（全混流恒化器：Ｃｌ－＜４．５ｇ／Ｌ,ＳＯ２－４＜１．８ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＜７．２ｇ／Ｌ,ＳＯ２－４＜３．０ｇ／Ｌ）;轻度抑制（全混流恒化器：Ｃｌ－＝４．５～６．０ｇ／Ｌ,ＳＯ２－４＝１．８～３．３ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＝７．２～８．２ｇ／Ｌ,ＳＯ２－４＝３．０～４．１ｇ／Ｌ）;中度抑制（全混流恒化器：Ｃｌ－＝６．０～１３．８ｇ／Ｌ,ＳＯ２－４＝３．３～６．５ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＝８．２～１０．０ｇ／Ｌ,ＳＯ２－４＝４．１～６．０ｇ／Ｌ）和重度抑制（全混流恒化器：Ｃｌ－＞１３．８ｇ／Ｌ,ＳＯ２－４＞６．５ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＞１０．０ｇ／Ｌ,ＳＯ２－４＞６．０ｇ／Ｌ）的不同Ｃｌ－和ＳＯ２－４浓度范围．     

氢氧化钠水溶液吸收羰基硫反应级数研究

常压下温度为３０～５０℃，用鼓泡反应器测定了羰基硫（ＣＯＳ）在浓度为１．３１３０～４．４０３８ｋｍｏｌ／ｍ３ＮａＯＨ水溶液中的吸收速率，通过理论分析得到该吸收为一级不可逆快反应吸收过程。     

球茎甘蓝鲜、干重变化及需肥规律的研究

研究了球茎产量在６０５８８．２ｋｇ／ｈｍ２条件下,球茎甘蓝植株鲜重、干重的增长动态及Ｎ,Ｐ,Ｋ,Ｓ的吸收规律。结果表明：植株鲜重、干重在出苗后７６～９０ｄ生长最快;平均每生产１０００ｋｇ球茎植株需吸收Ｎ３．２８ｋｇ,Ｐ２Ｏ５１．９４ｋｇ,Ｋ２Ｏ３．１７ｋｇ,Ｓ１．０６ｋｇ（比例为１．００∶０．５９∶０．９７∶０．３２）;植株吸收的Ｎ,Ｐ２Ｏ５,Ｋ２Ｏ主要贮存在球茎内,Ｓ则主要贮存在叶内;植株对Ｎ的吸收高峰在出苗后６１～７５ｄ,对Ｐ２Ｏ５,Ｋ２Ｏ和Ｓ的吸收高峰均在出苗后７６～９０ｄ。     

鸡蛋水解产物对酸性,碱性溶液中碳钢阳极过程的影响

通过测定碳钢在含有不同浓度鸡蛋水解产物的２ｍｏｌ／Ｌ盐酸、２ｍｏｌ／Ｌ硫酸、２ｍｏｌ／Ｌ碳酸铵溶液中的阳极极化曲线，研究了碳钢在不同介质中的阳极过程，发现鸡蛋水解产物对在酸性、碱性溶液中的碳钢皆有明显的缓蚀作用．在ＨＣｌ溶液及（ＮＨ４）２ＣＯ３溶液中，鸡蛋水解产物的最佳浓度为２．０％，在Ｈ２ＳＯ４溶液中，鸡蛋水解产物的最佳浓度为１．０％，并对鸡蛋水解产物的缓蚀性能进行了理论探讨     

Na2SeO3对稻苗生长及谷胱甘肽过氧化物酶的影响

以水稻为材料根施系列浓度的Ｎａ２ＳｅＯ３，试验对稻苗生长以及对苗中ＧＳＨＰｘ的影响．结果表明，低浓度的Ｎａ２ＳｅＯ３（００５～１０ｍｇ／Ｌ）能促进稻苗生长，最适浓度为０５ｍｇ／Ｌ；高浓度（≥２０ｍｇ／Ｌ）则对稻苗产生毒害．稻苗ＧＳＨＰｘ活性高度依赖于Ｓｅ的存在，揭示出该酶可能是一种依赖于Ｎａ２ＳｅＯ３的诱导酶．ＧＳＨＰｘ能有效地抵抗稻苗的Ｓｅ中度中毒，其酶活较对照提高９５８％；对于严重Ｓｅ中毒的稻苗有一定的抵抗作用，其酶活较对照提高６９２％．     

掺SrLi1／4Nb3／4O3的SrTiO3氧敏材料特性的研究

利用Ｈ２／Ｈ２Ｏ体系控制氧分压，采用四电极法测量了掺杂ＳｒＬｉ１／４Ｎｂ３／４Ｏ３的ＳｒＴｉＯ３瓷体在８００～１２００℃，ＰＯ２＝１０－１５～１０５Ｐａ下的电导率，当ｐ＜１００Ｐａ，σ∝Ｐ－１／８Ｏ２；ｐＯ２≥１００Ｐａ，电导率随ｐＯ２变化较为平缓．从缺陷化学角度探讨了ＳｒＴｉＯ３系材料的氧敏性能     

温度对Cr2O7^2—阳极形成过程的影响

用分解极化曲线法研究了在０．１ｍｏｌ／ＬＣｒ２（ＳＯ４）３＋１ｍｏｌ／ＬＮａ２ＳＯ４溶液中Ｐｔ和ＰｂＯ２电极上Ｃｒ２Ｏ７＾２－阳极形成和Ｏ２析出过程中温度的影响。实验结果表明,在１．９５Ｖ下,Ｐｔ电极上Ｏ２和Ｃｒ２Ｏ７＾２－的表观活化能分别为５７．４ｋｊ／ｍｏｌ和６１．３ｋｊ／ｍｏｌ;ＰｂＯ２电极上Ｏ２和Ｃｒ２Ｏ７＾２－表观活化能分别为４０．２ｋｊ／ｍｏｌ和４６．２ｋｊ／ｍｏｌ。温度对于Ｃｒ２Ｏ７     

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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