Windows环境CAD系统的开发与应用

本文介绍了一个Ｗｉｎｄｏｗｓ环境下的ＣＡＤ系统以及在Ｗｉｎｄｏｗｓ环境下使用该系统的方法。构造该系统，使用ＡｕｔｏＣＡＤ９．３０版，外挂矢量汉字，对ＡｕｔｏＣＡＤ进行了二次开发，建立了大量用户图块；用ＡｕｔｏＬｉｓｐ语言，编制了实用功能程序。利用窗口环境下多次执行ＡｕｔｏＣＡＤ的方法，实现了同时绘制编辑多张图纸，通过热键实现各图纸之间的快速切换；利用ＡｕｔｏＣＡＤ强大的图块功能，实现了图纸间的信息交换。     

异步并行非线性多分裂Newton-GAOR方法的收敛性

本文首先给出了解非线性方程组的Ｎｅｗｔｏｎ－ＧＡＯＲ方法．在此基础上，我们得到了异步并行非线性多分裂Ｎｅｗｔｏｎ－ＧＡＯＲ（简记为ＡＰＮＭ－Ｎ－ＧＡＯＲ）方法，证明了方法的局部收敛性，给出了其Ｒ１收敛因子，并得出了多步ＡＰＮＭ－Ｎ－ＧＡＯＲ方法比一步方法收敛更快的结论，文［１］［４］可看作本文的特例     

基于Auto CAD的公路辅助设计

近年来，公路设计部门已普遍采用计算机辅助公路设计，文章以线段连接、汉字标注等为例讨论了如何利用Ｃ语言和ＡＤＳ生成图形。基于ＡｕｔｏＣＡＤ平台，用ＡｕｔｏＬｉｓｐ 语言进行了ＡｕｔｏＣＡＤ的二次开发，讨论了建立线段连接作图命令集和ＡｕｔｏＣＡＤ下实现多种汉字标注的基本原理和方法，使用这些方法能提高工程作图的效率。     

VLAN实现方法及相关策略

阐述了ＶＬＡＮ的主要实现方法及其特点，讨论了ＶＬＡＮ间进行路由的相关策略，对ＶＬＡＮ各种实现方法的综合性能进行了比较。     

伪近邻方法在ARMA系统阶数判别中的应用

从相空间重构的角度，提出利用伪近邻方法判别ＡＲＭＡ系统的总阶数。该方法可在数据量较小的阈值固定的情况下判别ＡＲＭＡ系统总阶数。数值计算表明，使用该方法判别线性ＡＲＭＡ系统总阶数，取得了比较满意的结果。     

船舶CAD／CAM在大连理工大学的研究与进展

介绍了大连理工大学在船舶ＣＡＤ／ＣＡＭ方面开发成功的一系列软件系统和目前正在蔟关的一些船舶ＣＡＤ／ＣＡＭ软件，这些软件已经投入到造船厂和研究所等设计单位中使用，取得了一定的经济效益，在船舶ＣＡＤ／ＣＡＭ科研方面，采用软件工程的基本理论与开发技术，研究了软件系统的总体设计、国外优秀工程数据库和ＣＡＤ／ＣＡＭ核心软件的二次开发，船舶专用ＣＡＤ／ＣＡＭ支撑平台，优化方法，仿真技术，专家系统和人智能方法在     

产品图形库管理菜单自动生产系统

采用ＡｕｔｏＣＡＤ菜单文件的编程技术，提出了图形库管理系统自生成的方法，从而缩短了ＣＡＤ产品开发周期，提高了设计效率。     

AutoCAD扩展实体数据接口方法及实现

介绍一种扩展实体数据接口方法，基于该方法研制了通用扩展实体数据接口模块ＡｕｔｏＸＤＡ，论述了基于ＡｕｔｏＣＡＤ平台开发接口模块的主要特点和在ＡｕｔｏＸＤＡ中采用的数据模型，软件接口方案，高速缓冲机制及其在有限元建模软件中的应用等。     

一种参数化绘图方法的实现

介绍了一种实用的参数化绘图方法，即通过Ｖｉｓｕａｌ Ｃ＋＋调用ＡＵＴＯＣＡＤ的功能，从而实现了ＡＵＴＯＣＡＤ自动绘图，实践证明，该绘图方法具有一定的实用价值。     

有效制备核糖核酸的方法研究

核糖核酸的制备和分析受多种因素的影响．因此，在特定条件下制备高纯度和完整性好的ＲＮＡ的方法研究至关重要．本文以大白鼠肝为材料，研究ＲＮＡ的制备方法，建立了有效的ＲＮＡ制备方法．用紫外分光光度计和变性电泳分析所制备的ＲＮＡ，发现其纯度Ａ２６０Ａ２８０＝１．７～２．０，２８ＳｒＲＮＡ与１８ＳｒＲＮＡ的带宽比为２１．本方法具有节约节时，重复性好，产量较高，无ＤＮＡ污染等优点．这为ｃＤＮＡ合成，基因表达和调控等研究奠定了基础．     

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.     

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.     

A computer generator for randomly layered structures

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

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

正~~     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.