一种静态RAM双帧存结构的图形系统及应用

针对高速图形显示系统的应用要求，设计了一种采用静态RAM的双帧存结构的高速图形显示系统，双帧存的逻辑控制和显示控制器由FPGA实现，基于该系统的双帧存结构，提出了一种实现图形叠加的新方法，该方法通过两幅图形数据分别写入不同帧存的方式，实现两幅图形的叠加．进一步提出了一种实现复杂图形分割成两部分分别生成显示的方法，该方法使图形处理器的图形处理性能加倍．     

迭代产生的计算机艺术图形

为了在同一种迭代下，得到不同的计算机图形，给出了一种能够产生计算机对称图形的绘制标准；构造了效果良好的迭代函数，用相同的迭代函数、相同的参数生成了不同特色的图形;利用计盒维数讨论了图形的分形特征．实验证明，新的绘制标准不仅可以产生经典的Julia集图案，而且还可在实数城上设计出了精美的计算机艺术图形．     

采用分层推进教学处理教学难点

本文主要介绍了分层推进教学“平面上任何两个不同位置的合同图形，最多经过三次轴对称，便可使其中一个图形和另一个图形重合”的具体操作方法。     

对分形算法中递归法的研究

本文基于构造分形图形常使用的递归法，描绘了一幅逼真的分形树，并修改算法参数以枝叶的紧密度和树的弯曲度，得到图形的不同显示效果，说明递归算法使用不同的参数能产生各种各样的图形.最后，在构造好分形树的基础上完成了一个分形动画，使分形树有了平滑的动感，更加栩栩如生.     

配置IGES接口进行图形数据的传输

文论述了CAD／CAM中的图形规范化问题，分析了原始图形信息交换规范IGES，并以此为基础探讨了实现不同系统间图形数据交换的方法，并用此方法为Apollo机的IDGMR绘图系统构造了IGES接口．     

基于ObjectARX自定义实体的地下管线前端数据采集系统设计

采用ObjectARX的自定义实体开发技术，可以实现管线数据与管线实体的图形及几何表现实时匹配，创建AutoCAD中没有的管线自定义实体，随管线数据不同而变化符号、注记和其他图形表现，完成管线与图形的真正结合。     

图形的魅力——浅谈图形语言在招贴设计中的运用

图形在招贴设计中的运用是招贴设计的一个重要的方面。图形语言是最基本的设计语言，它的运用是一个科学而人性化的课题。其中图形的语义性、构成性成为了招贴设计中常用的适用方式；图形的风格化、民族化丰富了招贴设计的文化内涵；随着科技的发展，电脑、摄影的出现又使图形的运用从最简单的基本构成发展到了现代的多样化形式，形成了不同时期的不同风格。     

地形图编辑工作应用体会

本文主要介绍了地形图测绘几种常用方法中的图形编辑工作，叙述了不同成图方法中图形编辑工作的特点，为从事地形图编辑工作的同行提供参考。     

天气图相似检索研究

天气图中含有丰富的气象信息，这些信息的载体具有图形和数值两种不同的表现形式．针对图形类信息，构建一种特征向量，该向量突出图形特征，利于相似测度，适合于展开基于内容的检索．以此为基础，将天气图的相似检索分为基于各气象要素的检索和相似综合评判两个阶段，能够满足预报业务的不同需求．另外知识库的使用使检索系统具有较小的冗余和较强的柔性．     

计算机图形数据处理技术

采用按位分段的方法存储数据，并合成组合数据。对不同精度的图形数据选择不同的分段技术，压缩图形数据的存储量。组合数据的分解采用Ｃ语言的“位移运算”和“与运算”，可以加快计算速度，该方法已应用在ＳＵＮ－３工作站矢量汉字系统和ＡＰＰＬＥ－Ｉ微机矢量汉字系统中。     

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