模具CAD/CAE/CAM课程的教学改革与实践

简述了模具在工业生产中的重要地位及模具CAD/CAE/CAM技术在模具行业的重要应用,针对我校模具专业,在模具CAD/CAE/CAM课程的教学内容、课时分配、上课方式、学生参与企业实践和教师的培养方面作了改革,强调了理论与实践并举,从而达到培养学生兴趣,提高学生动手能力和创新能力,适应社会需求,提高专业市场竞争力的目标。     

模具CAD/CAM技术的应用现状及发展趋势

本文就CAD／CAM披术的定义、功能，模具CAD／CAM技术优越性、组成、发展观状等进行了分析，探寻了模具CAD/CAM技术的发展趋势和应用的靳路子。     

模具现代制造技术

该文分析了我国模具制造技术与国外的差距、模具现代制造技术的发展方向,集中介绍了模具现代制造技术中的核心技术:模具CAD/CAM、快速模具制造RT。对模具CAD/CAM、快速模具制造RT发展趋势进行了展望。     

模具制造业引入CAD／CAM效果分析

计算机CAD／CAM在模具制造业的成功应用，给模具制造业创造了高效率、高效益，同时也带来了一种全新的理念。本文着重分析CAD/CAM应用于模具设计、模具技术、模具加工等方面的优点和引入CAD／CAM时应注意的问题。     

在第二届全国电子信息应用展览会上我校一项成果获优秀奖

5月19日至5月25日,第二届全国电子信息应用展览会在北京召开.我校参加了本次大会CAD展的展出.其中,模具CAD/CAM系统获得本次展览会优秀奖.我校同时参展的项目还有机一系CAD中心的集成机械CAD制造系统.模具CAD/CAM系统是由机二系注塑成形模拟与模具技术实验室承担完成的“七五”项目.它包括注塑模CAD/CAM/CAE和冷冲模CAD/CAM.注塑模CAD/CAM/CAE是在微机386上开发的,专     

论中国模具CAD/CAM/CAE发展

文章首先介绍了模具在一个国家工业发展的重要性,接着阐述了模具CAD/CAE/CAM在模具设计及制造过程中的优点。最后通过国内模具CAD/CAE/CAM技术的应用现状提出了国内的不足和展望。     

CAD/CAM在模具设计与加工中的关键技术

随着模具工业的发展,快速、高效、精密成为模具设计的基本要求。传统的主要依靠技术人员的经验和操作技能来进行模具设计与制造已不能为满足现代模具设计与制造要求,随着制造业信息化时代的到来,现代制造技术快速发展,各种CAD/CAM(Computer-Aided Design/Computer-Aided Manufacturing)软件在工业设计领域得到了广泛的应用,CAD/CAM技术应用于模具设计与加工成为模具发展的必然趋势。探讨了CAD/CAM软件在模具设计制造中应用过程以及一些软件使用注意事项和技巧。以Pro/E和MasterCAM软件在注塑模具中的应用为例就CAD/CAM软件在模具设计与加工中的关键技术进行探讨。提高了零件的制造精度和模具设计质量,缩短了模具设计周期。CAD/CAM一体化技术使模具设计制造更加便捷方便。     

与“学科竞赛作品”相结合的“模具CAD/CAM”课程的教学改革

根据模具CAD/CAM课程的教学特点及存在的问题,基于目前高校对学科竞赛的日益重视,提出了模具CAD/CAM课程与学科竞赛作品相结合的"模具CAD/CAM"课程教学改革。实施效果表明,学生的模具CAD/CAM课程知识和各类学科竞赛的设计能力都得到了显著提高。     

基于CAD/CAM技术的中职模具专业培养模式

模具行业是CAD／CAM技术应用最为广泛和典型的一个领域，中职学校改革传统模具的课程设置和教学内容，形成以模具CAD／CAM技能教学为主的课程体系、教学内容和教学方法，成为一种新的模具人才培养模式。     

PLC控制系统的抗干扰措施

分析了电磁干扰及其对PLC控制系统干扰的机制,指出在工程应用时必须综合考虑控制系统的抗干扰性能,并结合工程提出了几种有效的抗干扰措施。该文分析了我国模具制造技术与国外的差距、模具现代制造技术的发展方向,集中介绍了模具现代制造技术中的核心技术:模具CAD/CAM、快速模具制造RT。对模具CAD/CAM、快速模具制造RT发展趋势进行了展望。     

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.     

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.     

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.     

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。     

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.     

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

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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