浅议VPN技术

本文从VPN的概念入手，介绍了VPN的优点和VPN的实现技术。重点论述了VPN的实现，这对我们全面认识和使用VPN来解决实际问题有着一定的指导意义。     

校园网NAT/VPN技术的研究与应用

NAT技术解决了校园网IP地址紧缺问题,实现了网内用户访问因特网的应用需求,VPN技术解决了校外用户高效、安全访问校内资源的问题,克服了校园网的地域限制。文章阐述了NAT技术和VPN技术的原理及在校园网中的重要作用,并给出了实际应用中的配置方法,对实际组网有较好的参考价值。     

利用VPN在图书馆中的应用

文章对VPN(虚拟局域网)的基本概念,VPN的工作原理及实现VPN的关键技术进行了阐述,结合学校校园网和图书馆网的VPN实际解决方案,对VPN配置及应用做了相应的描述。文章还介绍了VPN在图书馆的实际应用,重点介绍了VPN规则的设置。     

基于VPN的图书馆系统研究

本文讨论了数字图书馆建设和使用中存在的问题，介绍了VPN技术的特点，阐述了VPN在高校图书馆数字资源应用中的可行性。     

应用VPN技术构建校园远程办公平台

本文从校园网络在实际应用中遇到的问题入手,分析了依靠VPN技术构造远程办公平台的原理,并结合作者所在学校网络的实际情况,给出了一个搭建VPN网络,解决异地办公的具体解决方案。     

VPN解决方案

虚拟专用网VPN是一个新的网络热门技术，它可代替专线而以共网络进行网络互联，在减轻企业费用的同时带来了数据安全性的保护，讨论了VPN的原理，分类，隧道技术和VPN的应用。     

浅析虚拟专用网技术及其应用

介绍了虚拟专用网(VPN)及其核心技术——隧道技术及隧道协议,并在此基础上以实现校园网远程访问的VPN配置要求和方法为例,探讨了VPN在实际中的应用。     

SSL VPN在远程网络实验室的应用和实现

分析了使用VPN技术来解决校园网用户链接进入远程网络实验室进行远程网络实验的要求,阐述了虚拟专用网IP-SEC VPN和SSL VPN的优缺点和应用场合,介绍了如何使用SSL VPN技术保障校外用户链接进入网络实验室进行远程网络实验的安全性问题。     

SSL VPN技术与校园信息化

随着网络技术的迅猛发展,远程访问、私有网络信息共享、安全的需求日益明显。SSL VPN技术的出现能顺利解决此类问题,本文从SSL VPN的特点,联系我院校园网实际情况,分析SSL VPN的应用。     

网络实验室VPN实验项目的设计与实现

VPN作为信息安全的主流技术，在现实应用中越来越广泛。文章对实验室开展VPN实验的现状进行了分析，提出了4种VPN实验方案，并对各个方案的特点进行分析与比较，为将来进一步在实验室开展VPN实验提供了有益的参考。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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