矩形花键滚刀工作图绘制的CAD研究

介绍了在ＩＢＭ－ＰＣ／ＸＴ微机及绘图机上运行的由汉字ＤＢＡＳＥⅢ、ＧＷＢＡＳＩＣ和ＡｕｔｏＣＡＤ生成的矩形花键滚刀ＣＡＤ系统，它能自动完成各种类型及规格的矩形花键滚刀的设计计算和工作图绘制。着重讨论了该系统在滚刀工作图绘制中所解决的几个问题。     

DBASE文件数据字典系统的设计与实现

提出了一个自动生成ＤＢＡＳＥ文件档案的数据宇典系统。该系统通过定义控制 信息字典和ＤＢＡＳＥ文件字典，对输入的文件信息加以组织和分类，进而自动生成 标准化的 ＤＢＡＳＥ文件档案。文中描述了该系统的信息分析过程和字典结构，并给 出了系统的存贮结构与设计方法。     

齿轮滚刀的计算机辅助设计及参数化绘图

本文以齿轮滚刀为例介绍了在微机上开发刀具ＣＡＤ系统的方法,特别是借助于“ＡＤＳ”用Ｃ语言对ＡｕｔｏＣＡＤ软件进行二次开发,从而实现了齿轮滚刀的参数化绘图,该软件的开发途径和设计总路为今后进一步从事这方面的研究奠定了基础。     

基于事例推理(CBR)的同构模具工艺设计模型

从同构模具的实际情况出发,分析了同构模具ＣＡＤ系统中工艺设计部分开发过程所遇到的困难,在参考事例推理思想的基础上,提出了基于ＣＢＲ的同构模具ＣＡＤ软件工艺设计模型（ＳＳＰＰＣＢＲ）,并详细分析了模型中ＣＢＲ推理机、交互工艺生成模块、综合数据库、工艺知识库、ＣＡＤ系统主要模块的豚建立在这些模块基础上的同构模具工节生成原因、此模型的采用可有效提高同构模具工艺方案生成的智能性。     

计算机辅助多轴箱箱体孔系的加工

本文对组合机床多轴箱箱体孔系的计算机辅助制造系统（ＢＣＡＭ）进行了研究和开发。该系统与计算机辅助多轴箱设计系统（ＢＣＡＤ）组成一个ＣＡＤ／ＣＡＭ系统，它利用ＣＡＤ系统的设计结果，采用专家系统的推理方法，生成多轴箱箱体的孔系加工工艺和数控加工指令。     

基于冲模CAD／CAM开发平台的构件库系统的研制

基于冲模ＣＡＤ／ＣＡＭ系统开发平台的设计思想，提出并论述了基于冲模ＣＡＤ／ＣＡＭ系统开发平台软构件库中之软构件的定义、分类、描述与管理机制以及软构件库的树形结构图与软构件库系统——ＳＣＢＭＳ（ＳｏｆｔｗａｒｅＣｏｍｐｏｎｅｎｔＢａｓｅＭａｎａｇｅｍｅｎｔＳｙｓｔｅｍ）的功能模型及其实现思路，开发了一个原型ＳＣＢＭＳ．     

基于特征的回转体零件建模系统的研制

本文在分析了基于几何的ＣＡＤ系统的不足的基础上，提出了利用特征建模技术来建造计算机模型，并以所开发的ＦＢＲＰＭＳ系统为例，说明特征建模的原理和方法。该系统模块化设计，功能性强，易扩展，已成功地应用于ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成领域     

进给箱传动方案设计的智能CAD

综合运用人工智能理论及专家系统与现代ＣＡＤ技术，成功地开发了龙门铣床进给箱传动方案设计智能ＣＡＤ系统ＦＢＳＩＣＡＤ．通过对传动方案设计的分析，提出了系统设计的基本原则和方法，并给出了该系统的控制结构与功能。     

应用STEP实现机械CAD/CAM集成的研究

ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成的关键是建立统一的产品信息模型。ＳＴＥＰ标准提供了产品生命周期的数据表示与交换机制。该文根据ＡＰ２１４中对特征信息的规定所建系统,针对应用的需求及实现的复杂性,建立特征的应用解释模型,形成本系统的应用协议（ＡＰ）。该应用协议是ＩＳＯ－１０３０３ＡＰ２１４的子集,通过ＳＴ－Ｄｅｖｅｌｏｐｅｒ的ＥＸＰＲＥＳＳ语言编译器生成数据字典,ＣＡＤ系统根据应用协议生成面向加工的零件特征模型;ＣＡＰＰ采用派生式生成工艺规程;ＣＡＭ根据ＣＡＤ提供的特征模型和工艺规程生成刀位文件;ＣＡＭ－ＰＯＳＴ根据刀位文件生成ＮＣ代码。ＣＡＤ,ＣＡＰＰ,ＣＡＭ均由系统开发的ＡＰＩ／ＳＤＡＩ进行前／后处理,并通过ＳＴ－Ｄｅｖｅｌ－ｏｐｅｒ实现产品数据的交换与共享,达到ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成。     

NRDBMS数据库的结构特点及用户界面

ＮＲＤＢＭＳ数据库管理系统是一个适用于 ＣＡＤ／ＣＡＭ的数据库管理系统。在关系型 数据模型上增加了一种类聚型数据和一种间接地址存储数据方式，使更适合工程上的需 要。ＮＲＤＢＭＳ还提供了友善的用户界面，便于工程技术人员通过多种渠道访问数据库。 文中主要介绍该系统的结构特点及其用户界面。     

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.     

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.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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…