基于CATIA软件平台的自顶向下参数化装配设计

通过介绍计算机辅助设计中的参数化技术及自顶向下设计的基本思路，采用顶层基本骨架（TBS）建模方法，以CATIA软件为设计平台，以实际的设计阐述了如何以零件的特性构建零件的装配模型，从而把约束信息附着在零件上，使得该模型可以很好地支持自顶向下的设计。实践表明该模型可行有效。     

支持变型设计的装配模型建模方法

指出产品结构变型主要有纵向布局结构变化和横向布局结构变化两种基本形式，在装配模型层次化的基础上，将顶层基本骨架作为自顶向下设计建模时传递信息的纽带，以Pro/ENGINEER为技术平台，提出适应快速变型设计要求的装配模型的建模方法，从而实现产品的变型设计和系列化设计。     

机械压力机参数化设计的研究

本论文对机械压力机进行参数化设计：对压力机零件级设计以尺寸驱动与程序驱动结合的指导思路，其中对标准件主要通过工程约束确定其型号，对非标准件提取其技术参数和尺寸参数，通过工程约束和几何约束相结合的方法确定其具体尺寸，并且建立其模型；对部件级设计以“自底向上”为主，“自顶向下”为辅的指导思路，自底向上主要通过数据库来传递关联的参数来实现，而自顶向下主要通过添加方程式驱动实现。     

注塑模结构 CAD 的设计流程与装配模型

文章首先对注塑模结构ＣＡＤ的重要性及尚存在的问题进行分析。接着提出在注塑模ＣＡＤ三维系统的基础上采用“自顶向下”的设计流程,对实现该流程的关键技术进行讨论,提出了塑件骨架构型、模具符号零件、装配模型等概念。此外,还对参数化设计技术在注塑模结构ＣＡＤ柔性化方面的应用进行了讨论。     

产品级参数化设计方法研究

参数化设计已成为产品设计的重要方法，参数化设计主要分为零件级参数化设计和产品级参数化设计。零件级参数化设计已经在设计中广泛使用了，但是产品级参数化还在探索过程中，本文主要是把杂交思想应用到产品级参数化建模过程中，更够更好的加快产品的设计和更新周期。     

门式起重机门架的参数化设计

本文分析了门式起重机门架的结构设计,介绍了门架结构设计的原则,简述了门架设计中主要参数值的确定的相关理论知识,叙述了门架的三维参数化模型设计过程,利用SolidWorks三维软件实现门架的三维参数化模型,并用自顶向下的方法实现了装配,加快了门式起重机的总体设计,并为企业赢得市场竞争提供了有力的理论依据。     

制动器参数化设计系统概念设计

利用计算机技术，将制动器设计过程的选型、参数设计、二维绘图、三维显示、强度校核和动态模拟等有机集成，完成对车辆制动器进行参数化设计任务，实现对制动器系统的“设计－分析－再设计”的基本控制策略。该文将从系统的设计原理、功能结构、参数化设计环境、数据流分析、制动器性能分析等方面入手，对制动器参数化设计系统进行概念设计，为系统的详细设计和最终实现预定的功能奠定基础。     

VDPDS—一种变量驱动的参数化设计系统

介绍了一种变量驱动的参数化设计系统的设计方法和参数模型，该系统采用参数履历机制，能记录并再现设计人员的意图，从而实现了产品的变量驱动的参数化设计，为具体体现变量驱动的参数化设计思想，作者在文中给出了系统的一个设计实例。     

基于VBA的AutoCAD参数化设计探讨

本文介绍了AutoCAD VBA开发工具的特点和参数化设计的基本思想,探讨了如何利用AutoCAD内嵌的VBA语言实现常用机械图参数化绘制的方法。并用该方法进行实例绘制了常用的阶梯轴,结果表明利用参数化设计能有效简化系列化零件制图,缩短产品设计周期,改善设计质量,提高设计效率。     

"双参数三维题库"的设计与应用

阐述创建“双参数三维题库”的重要意义和设计思想，论述“双参数三维题库”的基本特点、设计技巧和使用方法．着重介绍在本题库的面向对象程序设计中，控件之间循环的“参数变换法”和“回扫程序”，以及“概率参数”功能的实现．     

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…     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.