提高DBASE—Ⅱ库文件输入速度的措施

本文对ＤＢＡＳＥ－Ⅱ数据库管理系统的库文件操作中提高数据输入速度的问题进行论述，以供选用的ＤＢＡＳＥ－Ⅱ建库的用户参考。     

工程CAD小型关系数据库管理系统

介绍了工程 ＣＡＤ小型关系数据库管理系统 ＣＡＤＤＢＳ 的定义语言、数据结构 和操作过程。数据库ＣＡＤＤＢＳ采用关系模型作为数据库的基本模型，因而只有结构 简单、快用方便、有较高的数据独立性等优点，可用于各种工程应用程序和数据文件 管理系统中．     

NRDBMS数据库的结构特点及用户界面

ＮＲＤＢＭＳ数据库管理系统是一个适用于 ＣＡＤ／ＣＡＭ的数据库管理系统。在关系型 数据模型上增加了一种类聚型数据和一种间接地址存储数据方式，使更适合工程上的需 要。ＮＲＤＢＭＳ还提供了友善的用户界面，便于工程技术人员通过多种渠道访问数据库。 文中主要介绍该系统的结构特点及其用户界面。     

集成CAD系统中工程数据库管理系统的设计与实现

介绍铁路站场ＣＡＤ系统（ＷＳＣＡＤＰ）中集成式工程数据库管理系统（ＲＥＤＢＭＳ）总体结构、集成数据模型以及数据存储管理的实现技术。     

流动注射光度法测铁

用自行组装的ＦＩＡ装置，对Ｆｅ（Ⅲ）、ＳＸＯ，Ｆｅ（Ⅲ）－５－Ｂｒ－ＰＡＤＡＰ－ＥｔＯＨ，Ｆｅ（Ⅲ）－ＣＡＳ－ＨＤＭＡＡ－Ｔｒｉｔｏｎ Ｘ－１００ ３种显色体系分别进行了系统的研究，考察了各种因素的影响，优化了工作条件，建立了３种测铁的新方法。     

DH法计算孔径分布程序的编制和应用

根据Ｄｏｌｌｉｍｏｒｅ－Ｈｅａｌ的计算公式，采用ＢＡＳＩＣ语言，编制了在ＩＢＭ机上进行计算固体表面孔径分布的计算机程序。利用本程序计算的数据与原始文献有很好的重复性和可靠性。     

基于CORBA的PDM系统实现方式

如何将产品数据管理系统（ＰＤＭ）建立在异构的环境上,并保护用户在ＣＩＭＳ中原有的资源是ＰＤＭ能否具有生命力的关键．论述了一个典型的ＰＤＭ系统体系及其基于ＣＯＲＢＡ的实现,重点讨论了ＰＤＭ与ＣＡｘ、ＭＲＰＩ应用系统的集成工具在ＣＯＲＢＡ上的实现以及数据库接口在ＣＯＲＢＡ上的实现,提出一个利用ＣＯＲＢＡ解决上述问题的方案,从而为ＰＤＭ系统的实现提出了一种新的思路．     

PBT／SBS—g—GMA共混体系的研究

采用溶融共混法制备了ＰＢＴ和甲基丙烯酸缩水甘油酯功能化改性ＳＢＳ的共混物，用ＦＴＩＲ、ＷＡＸＤ，ＤＳＣ，ＭＩ等方法对共混物进行了表征，探讨了熔融共混过程中ＰＢＴ和ＳＢＳ－ｇ－ＧＭＡ的反应机理，研究了ＳＢＳ－ｇ－ＧＭＡ对共混体系相容性，结晶性能，热性能和流变性能的影响。     

TRUEBASIC交互式二维图形生成与编辑系统

采用多层次，多窗口技术，集数据、图形、窗口为一体，建立了一个可操作性好且具有再开发功能的ＣＡＤ系统。在图形存贮结构上选用直线、圆弧为基本要素，获得了硬件支撑条件宽容度高的优点（用ＩＢＭ－ＰＣ即可实现）；并利用了ＴＲＵＥＢＡＳＩＣ的图形再开发功能。     

用SQL实现对事务数据和工程数据的统一操作

为解决ＲＤＭＢＳＯＲＡＣＬＥ不能操作非结构化工数据的问题，实现ＣＩＭＳ环境下ＥＤＢＭＳＥＤＬ和ＯＲＡＣＬＥ之间的信息共享。本文提供了将异构数据库ＥＤＬ和Ｏ－ＲＡＣＬＥ集成的一种方法，用ＳＱＬ实现了对结构化事务数据和非结构化工程数据的统一操作。     

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.     

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