琼脂扩散法生物检定的理论方程式——Ⅲ.与Cooper方程式的比较

本文首先验证了Cooper方程式能适用于放线酮的生物检定,然后分别从杯碟法和滤纸片法的理论方程式求得临界浓度和临界时间,最后比较按Cooper方程式和理论方程式的计算结果,发现它们吻合较好。因此认为理论方程式为Cooper方程式提供了理论根据,而Cooper方程式则是理论方程式的简化形式。     

知识创新与情报利用

引用布鲁克斯基本方程式说明知识创新寓不开情报利用，论述了情报利用在知识创新中的重要地位和作用，提出了知识创新中促进情报有效利用的若干项措施。     

HFC－134a状态方程的比较

本文论述了ＨＦＣ－１３４ａ状态方程的发展，对几个重要的方程式与实验数据进行了比较，发现Ｐｉａｏ方程式是工况范围内最佳关系式．     

二元混合气体玻耳兹曼方程式的一种模型方程式

本文提出一种二元混合气体玻耳兹曼方程式的模型方程式。此模型方程式满足宏观的质量、总动量和总能量守恒方程式，满足Ｈ定理，并且在分子流和粘性流两个极限情况下给出与玻氏方程式相同的解答。因此可以近似地用此模型方程式代替玻氏方程式讨论介于分子流和粘性流之间的过渡区的气体运动情况。     

浅谈中学化学离子方程式的书写

离子方程式的书写,是中学化学教学的重要内容之一.如何让学生准确、熟练地掌握离子方程式的书写,我认为应该做到以下几点.首先,要使学生明确离子方程式的含义,攻破书写上的难关.离子方程式是用在溶液中实际参加反应的离子的符号表示化学反应的式子.书写离子方程式可分为四个步骤,第一步,写出反应的化学方程式;第二步,把方程式两边易溶于水、易电离的物质改写成离子形式,难溶物质或难电离物质以及气体等仍以分子式表示;第三步,删去方程式两边不参加反应的离子(必要时再约去系数的公因子);第四步,检查方程式两边各元素的原子个数和离子的电荷数是否相等.     

关于氧化还原反应方程式配平法的再探讨

在综合了氧化还原反应方程式的代数法、化合价法等配平法则的基础上,结合普通反应方程式的奇偶法、观察法等的配平要领,介绍了氧化还原方程式的较为简便适用的迅速配平方法.     

歧化反应方程式的配平

在中学化学教学中,学生对氧化—还原反应方程式的配平感到难以掌握,而歧化反应方程式又是氧化—还原反应方程中最炼殊的一种类型.本文在遵循质量守恒的基础上,探讨了如何简便、快速配平歧化反应方程式的方法.     

列立水准网条件方程式的原则和方法

在水准网条件平差中,所列出的条件方程式之间可能有线性相关的现象.怎样快速准确地列出足数、独立、最简单的水准网条件方程式是进行条件平差的重要内容之一.在总结列立水准网条件方程式原则的基础上,用实例介绍了水准网条件平差时条件方程式的列立原则和方法.     

车削的圆弧齿圆柱蜗杆传动啮合原理

本文应用南开大学齿轮啮合理论研究组提出的“齿轮啮合的数学理论”,系统地研究了蜗杆轴截面为圆弧齿廓的圆柱蜗杆传动啮合原理。用矢量解析法推导出了这种蜗杆传动啮合原理的下列计算公式:1)、蜗杆齿面方程式;2)、啮合方程式;3)、接触线方程式,4)、啮合区方程式;5)、一类界限曲线方程式;6)、二类界限曲线方程式;7)、诱导法曲率计算公式;8)、接触线方向与相对速度方向夹角的计算公式。这些公式可用于分析蜗杆轴截面为圆弧齿廓的圆柱蜗杆传动的啮合质量。     

竞技体育可持续发展理论若干问题的探讨

初步探讨了竞技体育可持续发展的科学内涵、发展目标、模式及其特征、评价标准、制约因素,进而提出竞技体育可持续发展能力方程式.     

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     

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