FANUC数控车床自动编程与手动编程的结合分析

数控车床的编程主要分为自动编程与手动编程两种方法。自动编程通过借助CAD/CAM软件可以有效解决轮廓相对复杂的编程问题,手动编程可以快速高效地解决轮廓相对简单的编程问题。如何有效地利用这两种编程方法关系到企业的生产效率与生产产品的质量。本文结合CAXA数控车软件,针对一典型的轴类零件,分析了如何合理有效地使用这两种方法,给出了零件的编程分析过程并列出了G代码。     

浅谈PLC编程中形参的应用

PLC编程有很多方法,常用的有线性化编程以及模块化编程。本文以西门子S7-300PLC为例,阐述了模块化编程的优点,着重分析了在模块化编程中充分利用形参进行编程,并针对具体实例进行了分析。     

WAP与WWW网页编程比较

对WAP网页编程与传统的WWW编程在编程模型、服务器设置、编程语法等方面作了详细比较, 并阐明了WAP网页编程的方法。     

浅析数控机床编程技术

介绍了手工编程和计算机自动编程两种数控机床编程方法，指出了合理使用编程方法编制高效率的加工程序是提高数控机床使用效率的途径。     

浅谈Linux下游戏编程

本文通过游戏实例,介绍了游戏编程的思路和方法,使读者能学习和掌握游戏编程方法,从而迈入精彩的游戏编程大门。     

齿轮成形型腔加工数控自动编程

图形交互自动数控编程作为自动编程的一个发展趋势,目前已成为先进的CAD／CAM软件所普遍采用的数控编程方法。首先介绍了图形交互自动数控编程技术并详细讨论了图形交互自动数控编程的原理和方法。针对齿轮挤压成形的复杂型腔曲面,讨论图形交互自动数控编程的实现方法和步骤,该方法对实现复杂形状零件的高精度加工具有十分重要的意义。     

WAP与WWW网页编程比较

对WAP网页编程与传统的WWW编程在编程模型、服务器设置、编程语法等方面作了详细比较,并阐明了WAP网页编程的方法。     

工业机器人离线编程软件现状研究

工业机器人的编程方式有两种,即在线编程和离线编程。离线编程是目前主流的编程方法,而离线编程就要用到编程软件,本文就目前市面上的主流编程软件进行分析和梳理,综合比较了各种软件的优缺点,为机器人专业离线编程教学提供建议。     

FANUC基于椭圆宏程序的编程研究

随着数控技术的不断发展,在实际工作中经常会碰到许多编程难题,特别是一些不规则图形的加工与编程,相当一部分数控技术人员对此束手无策。针对实际教学与加工过程中所遇到的一些不规则形状的图形,文章采取了一些特殊的数控编程方法来简化编程,并对刀具补偿的使用进行了深入的研究和分析,特别对编程时所遇到的难点进行了分析。操作和编程的实践表明,该方法能很好地解决此类问题。     

用子程序车削深槽零件

介绍了线切割方法,提出了基于CAD的数控手工编程,在CAD上可找到手工编程所的坐标点,去掉繁琐的计算、自动编程中冗长的程序和增加的通信问题,并在生产中验证了这种方法的正确性和有效性。实践证明,该手工编程方法具有快、精、准以及提高生产效率和产品质量等优点。     

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.