矿井设计CAD中的采矿图素库

在汉化的ＡｕｔｏＣＡＤ系统基础上,用计算机绘制采矿工程图是一条方便而有效的途径。探讨井田开拓和采区巷道布置图的程序化和智能化问题,是矿井设计ＣＡＤ的难点和重点。用建立采矿因素库的方法可以较好的解决这个问题,目前研制的矿井设计ＣＡＤ系统已在现场应用。并在教学实践中推进了采矿工程学科的教学方法和课程设置改革。     

用形解决采矿CAD中的复杂线型问题

研究了采矿ＣＡＤ中形与形文件的制作 ，以此为基础设计出了符合《采矿制图标准》的复杂线型，解决了采矿ＣＡＤ专用线型的关键问题。     

面向对象技术在采矿CAD软件开发中的应用

以矿井交岔点ＣＡＤ软件的开发为例，阐述如何利用面向对象思想对采矿ＣＡＤ软件开发进行系统分析和设计，从而为采矿ＣＡＤ软件的开发提出了一个新的思路和方法，以提高软件的设计和质量。     

采矿CAD层次模型及对象分析

对煤炭行业的采矿ＣＡＤ应用和开发现状进行了研究和分析。提出了采矿ＣＡＤ的层次模型，及其对象树和复合对象的构成和部分对象的属性，并对对象树管理器基本功能作了初步的探讨。     

提高AutoCAD12作图效率之途径

根据ＡｕｔｏＣＡＤ１２软件包的开放结构，探讨了有关菜单、对话框、样板图、ＡｕｔｏＬＩＳＰ语言和块技术五个开发应用途径，实现ＡｕｔｏＣＡＤ１２用户化，从而大幅度提高ＡｕｔｏＣＡＤ１２作图效率。     

联想与一题多解

丰富的联想 ,能使思维富有创造性 ,使解题方法具有多样性。现举例说明。例　如图 1 ,在△ＡＢＣ中 ,∠Ｃ =90°,∠Ａ的平分线ＡＤ交ＢＣ于Ｄ。求证 :ＡＣ2ＡＤ2 =ＢＣ2ＢＤ 。联想之一 :由结论左边联想射影定理 ,因图中没有射影定理基本图形 ,于是作辅助线补全射影定理的基本图形 ;由结论右边联想辅助平行线及中点 ;由已知角平分线联想有关角平分线的基本图形。由此可产生两种证法。证法一 :如图 2 ,过点Ｃ作ＣＥ⊥ＡＤ于Ｅ交ＡＢ于Ｆ ,再过Ｅ作ＥＧ∥ＢＣ交ＡＢ于Ｇ。ＡＤ平分∠ＣＡＢ ∠ 1 =∠ 2ＡＤ ⊥ＣＥ ∠ＡＥＣ =∠ＡＥＦＡＥ =Ａ…     

系统化的机械产品计算机辅助设计（SCAD）方法的研究

通过将系统化的工程设计方法与ＣＡＤ技术相结合，提出系统化的计算机辅助设计（ＳＣＡＤ）方法。并研究了ＳＣＡＤ所包含的四个阶段－计算机辅助产品规划（ＣＡＰＲＰ）、计算机辅助概念设计（ＣＡＣＤ）、计算机辅助具体化设计（ＣＡＥＤ）和计算机辅助详细设计（ＣＡＤＤ）的一些具体实施方案，形成了ＳＣＡＤ技术的基本理论框架。     

面向CAD/CAPP集成的液压缸设计CAD系统

本文介绍了支持液压缸ＣＡＤ／ＣＡＰＰ 集成的ＣＡＤ 子系统－ 系统采用基于特征的信息表达方法实现了零件设计和工艺设计的集成－ 在零件设计过程中， 采用原形与基本图素库的方法减轻设计者的工作－该软件的实现方法为今后这方面的研究奠定了基础     

长轴类锻件模锻CAD系统研究

利用ＡｕｔｏＣＡＤ１１．０的高级造型扩展（ＡＭＥ），解决了模锻计算机辅助设计（ＣＡＤ）在微机上进行锻模三维实体造型的困难，建立了长轴类锻件模锻ＣＡＤ系统（ＤＦＣＡＤ系统），可方便地进行模锻工艺及锻模设计，并获得三维和二维锻模图。     

直接生成DWG图形文件的图形代真法

介绍了一种不经Ａｕｔｏ ＣＡＤ绘图软件，采用汇编语言，通过哑图直接生成ＤＷＧ图形文件的新方法。该方法在ＣＡＤ软件开发中有很大的应用价值。     

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.     

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     

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