亚硝胺在人体内的合成及其危害

亚硝胺是一种强致癌物质已被人们所公认，为了引起人们对亚硝胺的重视，本文论述了亚硝胺在人体内的合成反应及其对人体的危害，通过该文，人们可以采取必要的措施尽量减少自然界中的亚硝胺及其前体物质进入人体，从而预防亚硝胺对人体的危害。     

维生素对人体健康的妙用

随着社会的进步,人们对健康的含义越来越重视。为了提高生命质量,笔者对维生素的功用和大家共同探讨,为使我们能有健康的身体而科学的摄取维生素。维生素是人体维持正常生理功能所必需的,也是保持人体健康的重要活性物质,尚若缺乏就会引起相应的维生素缺乏症,对人体健康造成损害。     

美发剂对人体健康的影响

当今社会，美发已经成为了一种潮流，这其中染发剂、烫发剂功不可没．但是，不可否认的是，美发剂在满足人们爱美心理的同时，也在吞噬着人们的健康，它就象一个隐形杀手在威胁着人们的生命．本文主要阐述了染发剂、烫发剂的种类和化学成分，染发剂、烫发剂的作用机理及美发剂对人体健康的影响．     

关于室内甲醛污染的调查

近年来，甲醛对人体健康的影响越来越引起人们的关注。大量文献记载，甲醛对人体健康的影响主要表现在嗅觉异常、刺激、过敏、肺功能异常、肝功能异常和免疫功能异常等方面。其浓度在每立方米空气中达到0．06—0．07mg／m^3时，儿童就会发生轻微气喘。当室内空气中甲醛含量为0．11mg/m^3时，就有异味和不适感；达到0．5mg／m^3时，可刺激眼睛，引起流泪；达到0．6mg／m^3，可引起咽喉不适或疼痛。浓度更高时，可引起恶心呕吐，咳嗽胸闷，气喘甚至肺水肿；达到30mg／m^3时，会立即致人死亡。目前，国内外对甲醛的调查研究已越来越广泛，越来越深入。我们利用2个月的时间，在邯郸市随机挑选了100户家庭，对不同类型的建筑物，不同质地的装修材料．不同楼层．进行相同的测定。     

玄武湖风生流数值模拟研究

应用浅水湖泊风生流计算的二维有限元数学模型，对玄武湖风生流进行了数值模拟，并研完了玄武湖6m／s东南风风生流的历时变化特征及4m／s6种风向(E，W，S，N，ESE，WNW)下的稳定风生湖流特征．结果表明：6m／s风作用1h后在玄武湖开阔水域一般可形成稳定流场；稳定风生流场可以划分为逆时针环流主导型、顺时针环流主导型和过渡型3种类型；不同方位风场作用形成的稳定的风生流流态是不同的；对峙方位风场形成的风生流流型相似，流向相反．     

元末明初南京“准外郭”考

"准外郭"是元末明初存在于南京新城之外的一条外围防御线,它由沿江城墙防御带及金川河、玄武湖共同组成。从南京"墙中墙"的发现及俞本《纪事录》、朱元璋《阅江楼记》的记载可以推测出这条防御线的存在,而1360年朱元璋与陈友谅的龙湾之战则是"准外郭"形成的主要原因,此后"准外郭"随着南京新城、京城城墙的先后建设而稳定和消亡。始建于1359至1360年的"准外郭"是南京城墙建设的开始,为大明王朝的建立提供了坚强的保障。     

淮北闸河煤田二叠纪含煤地层中锥形沉积结构体特征及成因探讨

文章介绍了淮北闸河煤田二叠纪含煤地层中发育的一种奇特的地质构造－锥形沉积结构体．作者在对这种结构体观测描述的基础上，研究了结构体的物质组成、内部构造及物理力学性质，探讨了它的形成机理．初步认为，这种结构体是沼泽中高大乔木生长所引起的树干基部隆起或翘曲以及伴随产生的沉积．成岩作用过程中的差异压实造成的．     

潮阳区酸雨概况及防治对策

酸性降水对陆地生态系统、水生生态系统以及建筑物，人体健康的危害和潜在影响已引起人们广泛的注意。pH小于5．6的降水称为酸雨，潮阳区属于沿海城市，季风气候，大气质量较为良好，但随着燃料煤、燃料油的消耗量逐年增加，工业废气排放量、车辆的随之增加．形势不容乐观。     

肉碱在体育运动与身体健康中的作用研究进展

运用文献综述法，较系统地分析了肉碱对人体运动能力和健康的影响，其目的在于加强人们对肉碱营养价值的认识，并提出补充肉碱的可行性与必要性及补充方式．     

浅议口腔疾病的预防

口腔健康是人体健康和人类现代文明的最要标志之一．口腔健康状态是反映生命健康质量的一面镜子。临床表明。现代生活质量的提高和口腔及牙齿健康并不成正比．由于受不良生活习惯的影响,儿童牙病越来越多;人的寿命延长,要想完整、沽白的牙齿陪伴一生难度越来越大：口腔疾病已成为威胁人们身体健康的重要公共卫生问题,应当引起全社会的高度重视。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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