基于语义相似度的数字文献推广信息智能检索算法

考虑到传统信息检索算法在检索数字文献推广信息时存在安全性差、检索效率低的问题,提出了基于语义相似度的数字文献推广信息智能检索算法.基于数字文献检索信息文档,计算了数字文献推广信息中检索词的相关度,根据语义相似度,计算数字文献推广信息的权重值,利用数字文献推广信息数据库的查询结果,结合李雅普诺夫定理,提取数字文献推广信息关键特征,根据采集原始数据集的时间,计算数字文献推广信息的平均检索概率,利用过滤器清理数字文献数据库的局部推广信息,采用全局过滤器,清洗数字文献数据库的推广信息,通过定义数字文献推广信息检索元素值,计算了关键词之间的语义相似度,结合数字文献推广信息检索算法设计,实现了数字文献推广信息的检索.实验结果表明,基于语义相似度的数字文献推广信息智能检索算法不仅可以提高数字文献推广信息的检索效率,还具有很高的安全性.     

如何利用校园网查找文献

通过校园网建设和发展的概述,对校园网文献信息资源的如何利用和查找,以及检索的途径和方法,提出了自己的见解和看法,其目的是便于读者更好地利用校园网查找文献信息资源,提供借鉴。从而,有效地发挥校园网在文献信息检索和利用中的重要作用。     

国内蚕业网络信息资源与检索

从在线文献、专业网站、专业数据库、统计数据,以及专家和机构信息五个方面对蚕业网络资源的分布与检索进行了整理与介绍。     

对地方高校馆藏文献数字化建设的思考

馆藏文献数字化信息资源是为图书馆读者服务不可或缺的部分。如何利用现有的编目手段搜集、整理和编目信息资源,直接影响到读者对馆藏文献资源的获取、利用和服务的效果,是一个很值得地方高校图书馆认真研究的问题。     

网上标准信息的查找

标准文献是一种重要的信息资源，随着网络技术的发展，网上标准文献查找逐步成为主要的检索方式。文章叙述了如何利用网络来进行国内外标准文献信息的查找，并对国内外主要的标准信息网站及标准数据库进行了较为详细的介绍。     

应用ASP技术实现对科技文献数据库的动态查询

如何实现高效检索 ,更好地为广大用户提供科技文献信息服务 ,是科技文献数据库建设中一个非常重要的环节 .在对科技文献数据库的分类特点及其存储方式进行分析的基础上 ,主要阐述了如何利用ASP技术 ,采用三层结构来实现对科技文献数据库的动态查询 ,以满足用户的检索需求 .     

浅谈昆虫学网络资源的利用

本文从昆虫科技文献检索的角度 ,通过对 internet网上富含昆虫文献信息的各类数据库资源和网站进行收集、整理、分析和研究 ,为国内从事昆虫科技工作的各类人员提供相关的网络资源 ,信息的检索方法和简捷的利用途径 ,为减少昆虫科技工作者的网上盲目搜索提供参考。其主要内容包括 :几种搜索引擎和一些昆虫信息网站的简介、相关数据库介绍     

网络环境下法律信息资源的检索策略与利用

随着校园网的不断发展,各个高校都在积极建设自己的网络资源。如何从浩如烟海的网络上有效地检索到所需信息,这是法学学科及各学科都面临的课题。笔者结合法学专业师生经常咨询的如何查询因特网上法学信息资源的问题与工作实践,着重介绍了网络法律信息资源的检索策略与检索利用。     

经济文献信息的数字化及其检索

介绍了中外数字化的经济文献信息及其检索利用方法     

ISO国际标准的网络信息查询

我国加入WTO后,随着市场的国际化,国际标准已成为我国发展贸易和进行经济技术合作应遵守的技术依据.通过ISO国际标准网的信息查询,对在实际工作中,如何利用网络查找有关的国际标准信息,以及如何利用检索到的标准信息提取或购买国际标准文献进行了研究.     

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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