雷公藤优良单株选择技术(Ⅱ)——雷公藤的选择方法、选择标准

以雷公藤人工同龄林为选择群体,以枝数量、地径、平均藤径、平均藤长为选优性状,采用小样地调查方法并用指数选优法进行雷公藤优良单株选择,研究结果表明:雷公藤选优的合理对比株数量为16株;雷公藤枝数量、地径、平均藤长、平均藤径选优标准的性状比分别为1.5,1.45,1.45,1.85;通过多性状联合选择,从36株候选株中选出23个优良单株,入选率为1.05%,选择强度为1.388 9~1.756 2,优良单株各生长性状为林分平均水平的1.47~1.8倍.     

供应链中战略供应商选择的多级模糊综合评价

战略供应商的评价选择是供应链合作关系运行的基础。通过合理地选择战略供应商能在一定程度上起到整合行业供应链的作用，降低营运风险。在供应链中，战略供应商选择的多级模糊综合评价是一项对战略供应商选择的新体系，能够充分地揭示战略供应商选择的内在规律，确保对战略供应商的选择作出正确评价。采用模糊数学方法对战略供应商选择进行多级模糊综合评价，旨在对战略供应商的综合实力进行合理判断。     

基于熵权理想点法的人才选择

如何准确、科学、合理地进行人才选择是企业发展过程中生死攸关的问题,为使企业更好地进行人才选择,本文将熵权理想点法应用到该领域,为企业进行人才选择提供了一种客观、可行的定量方法。     

单相电能表的选用和安装

为了保证电能计量装置准确地测量电能,合理地选择与正确地安装电能表是很重要的环节。实际工作中,常因选择与安装的不合理,甚至错误接线等,给电能计量带来很大误差。本文就此谈几点看法。     

实验室中器皿选择及其洗涤方法的探讨

在实验室中,合理地选择及洗涤器皿是保证实验结果科学准确的基础条件之一。本文探讨了实验室中器皿选择及其洗涤的注意事项及具体方法,以期为环境保护、农林水利等行业实验室的日常检测工作提供一定借鉴。     

机械零件材料的合理选择

合理地选择零件材料是机械产品设计与制造中的一项重要工作本从零件使用性能，工艺性能及经济性等方面分析了材料的选择原则。     

合理选择焊接规范参数 提高焊接质量

为了获得优质的焊缝接头和较高的生产效率，必须合理地选择焊接规范参数。本文针对焊条电弧焊，阐述了如何合理选择焊条直径、焊接电流、电弧电压和焊接速度等焊接规范参数，以获得高质量焊缝和较高的焊接生产率。     

实验室中器皿选择及其洗涤方法的探讨

在实验室中，合理地选择及洗涤器皿是保证实验结果科学准确的基础条件之一。本文探讨了实验室中器皿选择及其洗涤的注意事项及具体方法，以期为环境保护、农林水利等行业实验室的日常检测工作提供一定借鉴。     

基于绿色设计的洗碗机内胆材料选择方法研究

文章以洗碗机内胆为例对现用材料(不锈钢)和几种潜在的替代材料(ABS、PP、PC)进行比较,以便选择出绿色性能更好的内胆材料.与传统材料选择过程不同,除了考虑材料诸多传统性能外,还考虑了材料的热损失和环境性能,从而能够更加全面地反映出材料的综合性能,因而得到的材料选择结果更加经济、合理与环保.     

数控加工中的刀具和切削用量

在借助CAM软件进行数控编程的过程中，刀具的选择和切削用量的确定是十分重要，本文介绍了切削用量的三要素，并对数控机床加工时切削用量的合理选择进行了详细阐述，所以，在编制加工程序时，选择合理的刀具和切削用量，是编制高质量加工程序的前提。     

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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