Java多线程技术的研究与应用

多线程机制使用程序能够并行执行，容易实现网络上的实时交互行为，本文分析了Ｊａｖａ多线程机制的基本特点，介绍了在多用户远程协同工作系统中，运用Ｊａｖａ多线程机制实现Ｓｅｒｖｅｒ和Ｃｌｉｅｎｔ端交互信息的实时处理。     

Java多线程技术的研究与应用

多线程机制使应用程序能够并行执行,容易实现网络上的实时交互行为本文分析了Ｊａｖａ多线程机制的基本特点,介绍了在多用户远程协同工作系统中,运用Ｊａｖａ多线程机制实现Ｓｅｒｖｅｒ端和Ｃｌｉｅｎｔ端交互信息的实时处理     

Java语言中的多线程机制的探讨

Ｊａｖａ作为新一代的编程语言,具有众多优点。它简单、面向对象、可移植、与硬件无关、系统强健安全、具有很高的性性能,并提供了分布性、多线程、动态性支持。其多线程机制受到程序设计者极大关心。本文对Ｊａｖａ的多线程机制进行了探讨。     

多线程Java程序的Petri网模型

Ｊａｖａ的多线程特性能有效地提高各种计算机资源的利用率．但是,多线程并行运行所造成的非确定性使得程序中潜在错误的定位和再现十分困难,这严重阻碍了Ｊａｖａ多线程机制的使用．提出了从Ｊａｖａ程序到Ｐｅｔｒｉ网的转化规则,利用所得的Ｐｅｔｒｉ网模型能有效地支持并行和分布式软件的分析．该模型在应用中取得了很好的效果．     

基于Java语言的多线程程序设计

本文介绍了基于Ｊａｖａ语言的多线程程序设计的特征,以及Ｊａｖａ语言多线程的实现方法,如何处理由于多线程而造成的死锁的问题。     

多线程在网络程序设计中的应用

讨论多线程思想在网络程序设计中的优越性,同时论及多线性的基本原理,多线程与传统的多进程的区别和Ｊａｖａ语言对多线程支持。在网络中使用Ｊａｖａ语言为开发工具,利用多线程的思想进行网络通讯程序的设计,以实现接收数据和发送数据的并行性,所设计的程序简洁明了,且易于实现。     

Java语言在通信程序中的应用

介绍了Ｊａｖａ网络通信方面的内容。在基于ＴＣＰ（传输控制协议）及ＵＤＰ（用户数据报协议）协议的前题下,运用Ｊａｖａ丰富的类库,完成了双机通信及多机通信等功能。给出了创建多线程的一些关键技术,为利用Ｊａｖａ语言开发通信程序的软件设计者提供了一些方法和经验。     

基于前后断言的多线程形式功能规格说明语言

探索用基于公理语义的前后断言方法来刻划多线程程序的功能，设计了一个功能规格说明语言ＪＡＶＡＳＰＥＣ，用来形式地表达程序的功能规格说明，为支持多线程的Ｊａｖａ程序自动生成奠定了基础     

网络环境分布式计算与Java实现研究

讨论了网络环境下的分布式并行计算,构筑了以Ｊａｖａ多线程机制为核心的分布式计算模型,在校园网上利用多台微机作分布式计算,结合水力发电工程算例,讨论了计算模型的建立、实现及实例计算的时效性等有关问题。     

Java运行系统与Java虚拟机

介绍了Ｊａｖａ运行系统的组成和Ｊａｖａ虚拟机的概念，讨论了采用Ｊａｖａ虚拟机的意义，分析了Ｊａｖａ虚拟机的体系结构     

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-