测验Q矩阵的修正方法及其比较研究

在认知诊断评估中,构建正确测验Q矩阵十分关键,但比较困难.该文将确定性输入噪音与门模型下3种在线标定方法(极大似然估计方法,边际极大似然估计方法和交差方法)用于测验Q矩阵修正,并与δ方法,γ方法和最小残差平方和方法进行比较.采用模拟研究验证和比较各方法的表现,研究结果显示:边际极大似然估计方法表现良好,交差方法次之; 项目所考查的属性数目是影响δ方法和γ方法的表现.     

试论高职院校教师激励方法的三个层次

许多高职院校都在寻找激励教师的有效方法,实际上激励方法是有层次的,对不同的激励对象实施不同的方法会起到更好的效果。三个层次的激励方法,即基本激励方法、特殊激励方法和无形激励方法可针对不同的激励对象实施。     

SEREX方法在肿瘤相关抗原筛选中的应用

SEREX方法是筛选肿瘤抗原分子的一种方便且高效的方法。本文解释了SEREX的原理及方法,介绍了利用该方法所鉴定出来的肿瘤相关抗原,讨论了该方法的优缺点,阐述了改进的方法,最后对该方法的应用进行了展望。     

混合元法及其在本质边界条件处理中的应用

为了解决无网格Galerkin(EFG)方法中本质边界条件的施加问题,提出了一种耦合径向基点插值无网格(RPIM)方法与EFG方法的混合元法.该方法将问题域分成两部分,在包含本质边界部分采用RPIM方法处理,其余部分采用EFG方法,然后利用两种无网格插值方法之间的关系进行耦合.数值算例结果表明:文中方法在简明有效地处理本质边界条件的同时,具有与EFG方法相当的计算精度,且易于编程计算.     

软件工程方法述评

对一些流行的软件工程方法,包括结构化方法、形式化方法、面向对象方法、基于构件的方法、基于Agent的方法、基于净室技术的方法、基于敏捷技术的方法等进行了述评,并对软件工程方法的发展趋势进行了初步探讨.     

关于径向基函数插值方法及其应用

用径向基函数插值方法及求解偏微分方程的方法,选取Multi-Quadric方法为径向基插值函数,逆Multi-Quadric方法对偏微分方程进行数值计算,并与其他方法进行比较,突出径向基函数求解偏微分方程的方法的优点,提出一些需要进一步研究的问题。     

多糖的提取、分离纯化及分析鉴定方法研究

详细介绍了动植物多糖的常见提取、分离纯化方法的最新研究进展,并比较了各种方法的优缺点．每种方法都有各自的优缺点,在提取时应根据所选材料的性质选用不同的方法,有些方法在一定的条件下可与别的方法协同作用,并对糖的含量测定及分析鉴定方法的研究进展作了概述．     

简述概率的四种确定方法

本文给出了概率理论中随机事件发生的可能性大小,概率的公理化定义及随机事件概率的四种确定方法即古其方法,频率方法,几何方法和主观方法.     

成批生产批量的确定方法及批量修正分析

本文运用了数学方法讨论成批生产批量的确定方法及批量修正分析.以目前常用的三种批量确定方法,即经济批量方法,最小批量方法和标准批量方法为基础,将这三种方法有机结合起来,形成一种新的批量确定方法,使得所确定的批量既有利于企业的经济效益的提高,又有利于设备能力的充分利用,又便于企业的生产组织工作.     

选择重尾阈值k的Bootstrap方法

详细讨论了重尾指数估计中选取k的Sum-plot方法和Bootstrap方法,并对Hall提出的Bootstrap方法作了改进,称为M-Bootstrap方法.并利用上述三种方法对已知重尾分布进行Monte-Carlo模拟,研究它们的可行性,比较它们的稳健性,改进的M-Bootstrap方法对重尾指数的估计在某些情况下优于Bootstrap方法.     

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

正~~