基于CORBA的分布式系统安全防范

在提出CORBA分布式系统基本模型的基础上 ,从防火墙技术、数据加密技术和身份认证 3个方面阐述了基于CORBA的分布式系统安全防范措施的设置 .     

基于计算机网络安全问题及其防范措施探讨

随着计算机网络技术的高速发展、Internet上共享信息与网上业务的不断增加,伴随而来的计算机网络安全成为不容忽视的问题,针对计算机网络系统存在的安全性和可靠性等一系列问题,本文从计算机网络安全的重要性、计算机网络安全存在的问题以及防范措施等方面提出一些见解,并且进行了比较详细的阐述,以使广大用户在使用计算机网络时增强安全防范意识。     

数字图书馆的网络安全和防范措施

从人为和系统两个方面对数字图书馆的网络安全进行了分析,阐述了可能影响数字图书馆网络安全的各种因素,提出了相应的保证数字图书馆安全的防范措施。     

冀中能源股份公司矿井综合自动化系统的应用研究

本文详细介绍冀中能源股份公司的煤矿综合自动化系统建设方面的情况，从公司自动化系统的现状分析．实现的目标．技术要求，组成结构和实现的功能作用等几个方面进行了阐述，矿井综合自动化系统建设，将大大提高了矿井安全预警和防灾减灾能力，具有不可估量的社会效益和经济效益。     

基于Web的嵌入式应用系统的模型设计与研究

对目前嵌入式系统开发中存在的不足，分析了以web为应用系统的开发和应用平台具有的优点，提出了结合嵌入式系统技术和web技术的模型：基于web的嵌入式系统的开发模型．文中主要从“模型的设计原理”、“模型的逻辑结构”以及“模型的实现方法”3个方面对该模型进行阐述．探讨了系统实现的一些技术：组件化技术、压缩技术和系统的安全机制等、并列举了基于该模型的一个应用实例．     

新型电子巡更系统的设计

电子巡更系统是比较有效的安全防范措施，目前电子巡更系统存在一定问题；根据相关的电子电工技术，改进了电子巡更系统中的巡更棒，使其具有数据采集和照明功能，降低了巡更人员的工作强度，增加了系统的可靠性；采用VC 6．0语言开发了电子巡更系统的管理软件，能够快速、准确地进行数据处理，满足业务要求。     

Multi-agent系统在电力系统中的应用

现代电力系统是一个复杂开放的分布式系统，Multi-agent是分布式人工智能的新技术，能使逻辑上和物理上分散的系统并列、协调地运行得以解决．结合Multi—agent技术的基本原理及适用范围进行了综述．然后针对Multi—agent系统的特征和体系结构重点阐述了在电力系统安全防卫体系、二次电压控制、电力市场和EMS以及发电厂中的应用并指出Multi—agent技术的发展方向．探讨了Multi—agent技术在电力系统其它方面的应用．指明了Multi—agent技术在控制系统组织、自适应能力及智能、交流3方面的研究方向，特别是在新型的电力系统广域协调控制领域的应用前景．     

浅谈信息管理系统网络安全

首先介绍了ASP技术的基本原理,然后论述了基于ASP的信息系统常见技术安全漏洞与技术安全隐患,最后从网络层、服务器断、数据库层这三个方面详细讲解了基于ASP的信息系统的安全防范措施．     

RSA密码系统的算法实现及安全性分析

阐述了公开钥密码系统RSA算法的原理及实现技术，并讨论了其在应用过程中的安全性及相应防范措施。     

上网用户安全防范

分析了Internet上常见攻击现象及其技术原理，总结出一套有效的网络安全防范措施，为上网用户提供安全保障．     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-