组合夹具装配过程中MDT的应用

简要介绍三维设计软件MDT在组合夹具装配过程中的应用,实现了MDT环境下组合夹具零件库的建立及组合夹具的装配过程.     

基于MDT流度小于3的钻后地层压力分析

DST和流度3的MDT是获得可靠钻后地层压力的基础,但西湖凹陷DST较少且MDT流度一般又3,这使得钻后地层压力分析存在较大的不确定性。通过对MDT测试原理研究认为,MDT测试值是泥浆柱压力和真实地层压力的综合体现,流度3的MDT点只要压力曲线恢复完成,多数可以用于计算真实地层压力。首次利用流度3的MDT资料,获得了较可靠的钻后地层压力。该方法在西湖凹陷K构造得到了成功应用。     

运用MDT系统优化CAD实验教学

介绍了在CAD实验教学中存在的问题,提出采用MDT系统提供的参数化技术对典型零件进行设计,合理的设置实验内容。实际应用证明,实验教学效果明显,学生综合应用能力大大提高。     

MDT环境下RP自适应分层算法中关键问题的研究

分层信息处理是快速成形系统软件中数据处理的重要环节。本文在MDT环境下对自适应分层算法中的关键问题进行了深入探讨。在自适应分层中,实现了MDT模型信息的提取,首次提出了基于法线和面积计算法综合判断层厚的方法,在此基础上,对二维截面进行处理,从而完成了二维截面轮廓信息重构。     

ActiveX Automation在AutoCAD二次开发中的应用

本文论述了 Active X Automatoin在 Auto CAD和 MDT( Mechanical Desktop)二次开发中的应用 ,并给出了以 VB为编程语言的部分示例代码     

短波高速调制解调器的设计

设计了一种适用于短波单边带电台数据传输的高速调制解调器，在MDT6000中实际应用表明，该设计具有高速、经济、可靠等优点。文中对其结构、设计原理、自适应等作了简要介绍。     

MDT测井在大气顶油垫底水油藏中的应用

MDT测井在流体界面识别方面具有准确度高的优点,同时MDT测井资料能够提供油藏中不同时间、不同位置的纵向压力剖面,因此能够为油藏动态分析及数值模拟计算提供第一手资料,从而有效提高油藏工程分析的准确性。在针对JP油田大气顶油垫底水油藏实际油藏工程分析中,MDT测井应用效果明显。     

基于模板的液压机身三维快速设计

文章阐述了在MDT环境下,开发基于模板的液压机身三维快速设计模块的基本方法和关键技术,以及使用控制程序对设计、修改过程进行全面控制的原理和实现途径,最后介绍模板的调用方法.该研究对实现液压机快速设计和提高企业的市场竞争力具有一定意义.     

基于MDT/MasterCAM的金属型铸造模具CAD/CAM

以空调器压缩机气缸为例，介绍了如何用MDT和MasterCAM实现铸造模具的开发过程，对其几何外形造型设计和数控加工编程进行了详细的分析，实现了CAD／CAM技术在铸造模具中的应用。     

面向快速原型的数据处理与三维造型一体化软件系统

基于MDT软件环境，开发了面向快速原型（RP）的数据处理与三维造型一体化软件系统．首先对系统的集成框架进行描述，然后在深入研究MDT软件平台下CAD模型数据的内部表达方法以及拓扑信息和几何信息提取方法的基础上，运用基于网格划分的曲面与平面求交原理，构造并实现了一种法矢和面积双重判据的自适应直接分层算法．按照所提出的新型二维层片数据文件格式，运用VC＋＋6．0和MDT软件应用程序开发接口，对MDT软件进行二次开发，从而实现了CAD造型与RP数据处理的无缝集成．研究结果表明，该系统具有良好的柔性和实用性，可有效提高快速原型制件质量和简化数据前处理的过程。     

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.     

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.     

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)

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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.