基于数据库的全参数化CAD系统的应用

实现产品设计系列化是提高设计效率的有效途径,参数化计算机绘图与数据库资源的有效连接是实现设计系列化的最好方法.介绍了以一个企业的相似产品进行分组,建立产品全信息数据库而实现全参数化CAD的一种方法,同时介绍了一种适合系列化全参数化CAD的基本原理、数据结构和相关技术.     

基于数据库的全参数化CAD系统的应用

实现产品设计系列化是提高设计效率的有效途径，参数化计算机绘图与数据库资源的有效连接是实现设计系列化的最好方法。介绍了以一个企业的相似产品进行分组，建立产品全信息数据库而实现全参数化CAD的一种方法，同时介绍了一种适合系列化全参数化CAD的基本原理、数据结构和相关技术。     

液压缸参数化CAD系统建模方法研究

本文研究建立液压缸设计过程的功能模型;建立主要零件及液压缸产品的参数数据库模型;建立面向对象的液压缸产品模型;建立液压缸零部件及标准件三维参数化模型库;规划液压缸参数化CAD系统的框架结构;为液压缸参数化CAD原型系统的开发奠定基础。     

基于参数化和专家系统技术的汽车总体设计CAD系统

分析了汽车总体设计阶段的任务,以参数化绘图技术和专家系统技术为基础,结合数据库技术建造了基于参数化和专家系统技术的汽车总体设计CAD系统·该系统可以以人机交互的方式完成整车方案设计的全过程,最终给出符合设计目标的总布置图的三维模型;给出了该系统的总体结构,简述了设计参数选择专家系统模块的实现方法和功能,详述了基于UGII,利用其二次开发工具开发的各参数化图库的功能和建造方法·     

基于VB的客车底盘总布置参数化设计系统

针对客车底盘设计更新、换型周期短的特点，在建立客车零部件图形库、底盘参数数据库的基础上，基于AutoCAD ActiveX自动化界面技术，用Visual Basic进行AutoCAD二次开发，建立客车底盘参数化总布置绘图系统，即客车产品数据管理系统(简称BPDM)．该系统的研制在一定程度上实现了客车底盘的虚拟设计，可以快速高效地绘制客车底盘总布置图．     

XML密钥管理规范的研究

本文对参数化绘图的基本原理进行了分析,介绍了AutoCAD2004环境下运用VBA编程实现参数绘图的方法,并给出具体实例,实现了对三维弹簧造型设计的参数化绘图。     

CP型单螺杆压缩机的计算机辅助设计

基于CP型单螺杆压缩机工作原理和主要零部件设计计算方法，利用三维建模、工程数据库、三维动画和可视界面等先进技术，完成了集实体建模、参数化设计和绘图、动画演示等功能于一体的计算机辅助设计系统。     

用VBA实现Auto CAD2002参数化三维造型设计

对参数化绘图的基本原理进行分析,介绍AutoCAD2002环境下运用VBA(VisualBa sicApplication)编程实现参数绘图的方法,实现了对渐开线圆柱齿轮三维造型设计的参数化。     

基于SolidWorks球形关闭件二次开发的设计与研究

对SolidWorks进行二次开发是实现绘图设计系列化,参数化的关键。介绍了SolidWorks的应用程序接口API函数的使用方法。并结合球阀球形关闭件的开发实例,阐述了利用Visual C 对SolidWorks进行二次开发,实现产品的参数化设计,并驱动生成三维模型的思想和方法。     

电加热器敏捷设计系统研究

提出了一种电加热器产品的敏捷设计平台结构,研究了CAD系统与PDM／ERP软件的接口、数据通信及基于产品定制的参数化设计方法,阐述了CAD软件与SQL Server数据库相联的二次开发及基于图库的多文档参数化设计技术。在AutoCAD软件平台上采用C＋＋语言及Objec—tARX技术,开发了整个系统功能,实现了优化计算、参数化绘图、数据管理、工艺设计一体化等,提高了产品设计质量和设计速度。     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

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

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.