铝合金中六元素的炉前化学分析法

对现有的铝合金化学分析方法进行了筛选，简化，并作了适当改进，建立了铝合金中硅，铜、锰、铁、镁和锌六元素的快速分析方法，该法的特点是设备投资少，分析速度快，准确度较高，适用于炉前分析，对化验设备较简陋的乡镇企业尤其适用。     

多功能铝合金铸造机的开发与应用

随着铝合金材料的广泛应用,各种铝合金铸造设备应运而生,但每种设备所能生产的零件类型相对单一,为解决这个问题,济南铸锻所以笔者为首的技术人员开发研制了多功能铝合金铸造机。首款机型结构简单,操作方便,可适用于多种铸型的浇铸。     

BCO光度法测定含镍铝合金中的铜

针对ＢＣＯ光度法测定含镍铝合金中铜稳定性差的缺点，用ＮＨ３－ＮＨ４Ｃｌ溶液作为缓冲介质对ＢＣＯ法作了改进，测定含镍铝合金中的铜含量，结果稳定，准确，再现性良好，方法简便而实用，特别适用于炉前分析。     

丁二酮肟重量法测定铝合金中镍的含量

当铝合金样品中的镍质量分数≥5.0%～30%时,采用丁二酮肟重量法测定铝合金中镍的含量。其方法原理是,在乙酸铵缓冲溶液中,用亚硫酸钠将铁还原至二价,用酒石酸作络合剂,在pH9.0～10.0时,镍和丁二酮肟生成沉淀,与铁、钴、铜、锰、铬、钼、钨、钒等元素分离,丁二酮肟镍经105℃±5℃烘干并称至恒量。论文对所用仪器设备、试剂、试样、分析步骤、共存离子干扰试验及样品分析等进行了试验,方法具有分析结果准确、设备简单、操作方便的优点,该方法适用于作为铝合金中镍含量的分析方法。     

铝合金连铸生产中液压系统的污染控制

在铝合金连铸连轧的生产线中，需多设备的动作都是由液压系统完成的，液压系统产生污染将导致设备的正常运行。本文了讲述了液压系统污染对液压元件的危害，分析污染产生原因，提出了对液压系统污染的控制。     

新型排水管道-铝合金UPVC复合排水管的技术特性及应用

铝合金UPVC复合排水管,使用寿命长、经济适用、连接方便可靠,克服了普通UPVC排水管的致命缺点,使其具有其它排水管材不可替代的光点。推广应用时机已成熟,工程应用会越来越多,前景看好。本文通过对铝合金UPVC复合排水管的技术、结构特性的概述及市场应用分析论述铝合金UPVC复合排水管在工程应用的价值。     

大型薄壁铝合金零件加工过程研究

本文以某大型薄壁铝合金零件为例，主要介绍了工艺优化，从刀具及加工参数的选择、制定工艺走刀路线、优选设备和夹具、测具的选择和温度控制等方面简单论述了大型薄壁铝合金零件加工工艺要点。还介绍了零件的防腐蚀保护、周转和储存保护。解决了铝合金零件受温度影响大，易变形，易腐蚀的问题，为今后铝合金零件的加工技术提供参考。     

同轴成像激光非接触测量传感器的研究

对适用于设备监测诊断系统的多种体系结构进行分析与研究，指出各自的优缺点和适用对象，并以２００ＭＷ汽轮发电机组监测诊断系统的结构设计为例，进行了实例设计分析．     

铝合金电缆导体制造技术与质量控制研究进展

电缆用铝合金导体以其优良的综合技术经济性能受到广泛的应用,其生产工艺、制造装备和质量控制一直是研究的热点.从技术角度出发,对铝合金导体结构形式的选择、设备形式与特点和各种不同生产工艺进行了综合比较分析,并对实际生产过程中铝合金导体电阻、伸长率和表面质量等问题的产生原因和表征进行剖析,提出了相应的解决措施和方法.致力于为改进和规范我国电缆行业铝合金电缆产品用铝合金导体的生产制造和质量控制提供参考,从而提高铝合金电缆在实际应用中的安全性和可靠性.     

BCO光度法测定含镍铝合金中的铜

针对ＢＣＯ光度法测定含镍铝合金中铜稳定性差的缺点,用ＮＨ３－ＮＨ４Ｃｌ溶液作为缓冲介质对ＢＣＯ法作了改进,测定含镍铝合金中的铜含量,结果稳定、准确,再现性良好,方法简便而实用,特别适用于炉前分析．     

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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