面粉中BPO含量的气相色谱测定

建立用毛细管气相色谱法测定面粉中BPO含量的方法,研究表明,线性范围为0．005g/L～0．10g/L之间,相关系数为0．9955,检测限为2．2μg,RSD为2．24%～3．18%,回收率为93．5%～96．8%．该方法简单、快速,能准确、有效地监测面粉质量。     

氢化物发生原子荧光光谱法测定尿中铅

采用 AFS-2 3 0型双道原子荧光光度计测定尿中铅 ,对仪器条件、精密度、准确度等方面进行了探讨性实验 ,结果满意 ;方法的检出限为 0 .1 9ng/ ml,相对标准偏差为 2 .0 1 % ,回收率为 91 %～ 1 0 8% ,线性范围 0～ 5 0 0 ng/ ml     

毛细管气相色谱法测定面粉中增白剂BPO的含量

探讨了毛细管气相色谱测定面粉中过氧化苯甲酰含量的方法 ,实验结果为 :方法的线性范围在 :0 .0 0 5～ 0 .10g/L之间 ,相关系数 :0 .995 5 ,进样量为 1μ时 ,检测限为 :2 .2ng ,RSD为 2 .2 3%～ 3.19% ,回收率为 93.3%～ 96 .5 % ,本法简单、快速 ,准确度较高 ,是一种适用于面粉质量监测的较好方法。     

罗丹明类染料的固体表面室温磷光分析法的研究——罗丹明类碱性染料用作磷光探针的尝试

罗丹明 B和丁基罗丹明 B的固体表面室温磷光 p H范围、光照稳定性 ,实验方法的精密度以及线性范围和检出限等都需要进行细致的研究 .实验结果表明 :罗丹明 B和丁基罗丹明B的 p H范围分别为 1 .90 ,2 .40 ,1 .75～ 3.50 ;光照稳定时间均为 3min;RSD分别为 5.1 9%、2 .63% ;线性范围分别为 (0 .9ng～ 956.0 6ng) /斑点 ,(1 0 ng～ 2 1 4.2 4 ng) /斑点 ;检出限分别为0 .0 0 4 4 ng/斑点 ,0 .0 4 8ng/斑点     

高碘酸钾分光光度法测定水中锰(Ⅱ)的改进

提出加入柠檬酸钠以掩蔽水体中Ca2+对锰(Ⅱ)测定产生的干扰,改进国家标准GB/T 11906-1989中高碘酸钾分光光度法测定水中锰(Ⅱ)的方法.结果表明:所建立方法的线性范围为0.20～20.00mg.L-1,相关系数R2为0.999 3,检出限为0.05mg.L-1,标准加入回收率为95.8%～101.4%,相对标准偏差(RSD)为0.15%～2.47%(n=3).     

HCl-HNO3消解法测定聚环氧琥珀酸螯合物中的钙含量

针对聚环氧琥珀酸（PESA）螯合物中钙含量的测定难题，研究了多种分析方法，发现PESA螯合物中的钙离子不能使铬黑T等金属指示剂正常显色，因而难以用EDTA直接滴定法和返滴定法测定。沉淀分离法、离子交换分离法、溶剂萃取分离法等分离方法均不能将PESA与钙离子有效分离。PESA对普通氧化剂很稳定，但HCl-HNO₃的氧化效果非常好，因而PESA螯合物中的钙离子含量可用HCl-HNO₃消解EDTA滴定法测定。该分析方法的测定结果具有良好的精密度和准确性，相对标准偏差范围为0.52%～1.56%，加标回收率范围为97.5%～102.0%，Cl^-，CO3^2-，SO4^2-对测定结果无干扰。     

Tyndall光散射法测定环境水中Pb(Ⅱ)

研究了Pb2+与S2-反应体系的Tyndall散射光谱.结果发现,在TritonX-100存在下,PbS微乳体系在396nm处Tyndall散射光强度与Pb2+浓度呈线性关系,据此建立了Tyndall散射光检测痕量Pb(Ⅱ)的新方法.方法的线性范围为9.44×10-3～5.5μg/ml,相关系数r =0.9991,检出限为2.83×10-3μg/ml,RSD＝1.06%,样品加标回收率为94.00%～97.00%.方法简便,灵敏度高.     

重庆市都市圈大中型水库富营养化现状及评价

对重庆市都市圈6座水库的监测结果表明,所有调查的水库均具备了产生富营养化的条件.各水库Chla值范围为4.62～36.40mg/m3;TP范围为0.012～0.323mg/L;TN范围为0.005～5.94mg/L;SD范围为0.48～1.95m;CODMn范围为1.24～7.03mg/L.3种评价方法的相关性较好,综合营养状态指数法可作为评价水库富营养化的统一方法.评价结果:5座大中型水库中,达到重度富营养化的1座;轻度富营养化的2座;中营养水平的2座.这表明都市圈内大中型水库的富营养化程度已经相当严重.     

沼气水洗技术中解吸工艺对提纯性能的影响分析与优化

以中试规模的25 Nm³/h沼气压力水洗提纯实验系统为基础,耦合填料吸收塔/填料解吸塔和填料吸收塔/旋转解吸床两种工艺,研究解吸工艺对提纯性能的影响以及强化解吸的优化对比。塔/塔系统实验结果表明,当鼓风量Q_a从0增至20 Nm³/h时,吸收塔的分离效率快速上升(产品气CO₂体积分数y₂至3%以下)而后趋向稳定,权衡效率与能耗下Q_a与进气流量G的优化比值在3～4之间。在压力为0.85～1.15 MPa、温度为10～25℃、液气比1∶8～1∶5、进气CO₂体积分数为35%～50%及进气流量为15～30 Nm³/h条件下,分析了解吸对分离性能的影响程度及机理,发现当进水CO₂摩尔分数达0.000 1时相对纯贫液的传质单元数N_OG上升幅度在15.7%～42.8%之间。通过塔/床系统实验得出当转速增至840 r/min时,y₂快速下降至2.02%而后趋向稳定...     

生物陶粒滤池预处理富营养化水库水源的净化效果与工艺参数

针对受污染的水库水源水进行中试规模的生物陶粒滤池预处理实验研究。结果表明：生物陶粒滤池能有效地净化受污染水源水水质,对COD_Mn、NH₃-N、NO^-₂-N、浊度、藻类总数、锰、THMFP等的平均去除率范围分别为19.3%～35%、89%～96.5%、97.5%～99%、57.5%～69%、60.1%～84.3%、59%～84.6%、10.4%～24.8%。其适宜的工艺参数为：水力负荷(滤速)4～6m/h,气水比0.75∶1～1∶1;反冲洗周期3～7d。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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