微型温度自控实验装置

微型温度自控实验装置是我组为自动化专业学生实验教学而设计的。它具有体积小、造价低、能耗省、加工制作方便和功能多等特点,是自动化实验教学的良好工具。 本文着重介绍了这种“微型温度自控实验装置”的特点、结构及其功能,并附有该装置的实验结果。     

化学课件的制作软件

本文介绍了采用图元法研制的化学课件制作软件ＨＴ的设计思想；给出了使用本软件制作的一般化学结构式和玻璃实验装置等课件实例     

电话远程控制系统实验装置的设计

介绍了一种基于公用电话网的远程控制系统实验装置的设计与制作,并对其系统结构、各部分功能和系统软件进行了论述,指出该实验装置不仅可以用于物理实验教学,还可以用于其他场合。     

一种新型封闭式自除粉笔灰装置的研制与设计

粉笔作为教育教学的重要工具,在给我们带来便捷的同时也带来了诸多隐性伤害.就此设计了自除粉笔灰装置,介绍了其设计原理、结构方案等.该装置利用挤压收缩惯性去除粉笔灰,具有重力沉降的收尘机制.实验表明:该装置除灰效果好,制作成本低廉,有很强推广价值.     

浅述托里拆利实验装置改进方法

为了在课堂上更好的利用这一实验,使学生直接观察或测得大气压值,我在课堂教学中设计并制作了两种托里拆利实验装置,对教材实验装置稍作修改,但仍保持原实验的直观性。     

凝固点降低法测定摩尔质量实验的优化改进

在经典的凝固点降低法测定摩尔质量实验装置基础上,针对搅拌、保温以及温度监测等方面进行了改进.利用带热电偶的磁力搅拌器调节转速,同时监测寒剂温度,并制作了半封闭的泡沫保温层,保温的同时便于观察体系变化.改进的装置经学生实际测试,实验效果好,容易操作与维护.     

太阳电池特性实验装置的设计与制作

伏安特性曲线是太阳能电池品质的重要参数,论文完成了太阳电池伏安特性曲线测量装置的设计与制作。通过实验装置可以获得太阳电池伏安特性曲线,进而得到太阳电池的各项参数和性能指标,实验装置可以用于大中专院校的大面积实验教学。     

过氧化氢催化分解实验的改进

本文通过对过氧化氢催化分解实验的数据处理方法的改进,进而对实验装置进行了改进（一是改进了加样方法,二是新设计、制作了一个电控止水夹装置）．改进后的实验无需测量反应后放出氧气的总体积Ｖ∞,加样方便,控压稳定．     

管式太阳能海水淡化装置的实验研究

针对淡水资源短缺的问题,设计制作了一种利用太阳能或者其他余热驱动的管式海水淡化装置.通过对装置的每小时产水量及装置内各测点温度进行测试,对装置的性能进行了定功率和定温度供热的实验研究.定功率实验结果表明,实验装置的性能系数最高能达到1.5左右;装置的产水量达到了20.078 kg/(m2.d),相比传统装置有很大的提高.定温加热的实验结果表明,运行温度的增加可以提高装置的产水量.在相同实验条件下,多级装置相比单级装置能获得更高的产水量.     

物理实验中有趣的几个“三”

对初、高中阶段的物理实验进行系统总结,从实验的基本组成、测量仪器的构成以及自动控制装置的构成三个方面进行了分析,发现都与＂三＂有密切联系。掌握了物理实验的基本组成就可以根据需要灵活设计探究实验;掌握了测量仪器的基本构成就可以根据需要自行设计、制作实验器材;掌握了自动控制装置的基本构成就可以设计、组装自动控制装置。通过对物理实验规律的归纳总结引导读者反思实验教学中对科学方法教育的创新和钻研。     

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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