浅析普通机床的数控改造

论述了普通机床数控改造的可行性、必要性和经济性，并对C620-1型普通机床的数控改造过程进行了较详细的总结和论述，对普通机床的数控改造具有实际的指导作用。     

B210型龙门刨床试车与调整及电气改造方案

介绍B210型龙门刨床经大修后的试车与调整方法及几种机床电气改造方案。     

PLC技术在机床改造中的应用

随着信息技术的不断发展,根据生产的需要,企业的传统升级改造已成为一种新兴的经济增长方式。而可编程序控制器(简称PLC)技术随着它的成本低、系统简单、调整方便等优点也越来越多的被应用到机床的改造系统中。该文重点是通过对CA6140型普通机床电气控制系统的改造,浅谈一下PLC在普通机床改造中的实际应用。     

滚齿机传动误差单片微机的补偿

提出采用单片微机对滚齿机传动误差进行在线实时补偿，介绍了用单片微机对滚齿机传动误差进行采样并对其进行补偿的硬件和软件系统，该系统用于一台Ｙ３８Ａ型精密滚齿机上后，该机床传动误差下降了５０％。     

X5040铣床数控化改造的实施

机床数控化改造对于我国制造业信息化是很有必要性的。针对某厂X5040型普通铣床数控化改造项目,提出了采用国产DTM-5T数控系统对该机床数控化改造的方案,实施了机械部分、电气部分的改造。机床改造后,对机床静态的精度进行检测,各项精度达到指标,满足客户的要求,成功地完成了改造任务并为国产数控系统的应用与推广提供了一个依据。     

普通机床数控化改造研究

介绍了普通机床数控化改造的总体方案设计,并以CA6140型车床为例阐述数控改造的总体方案,机械部分改造,数控系统设计等内容,对普通机床的数控改造具有实际的指导作用。     

浅析CA6150车床的数控技术改造研究

本文介绍了普通车床的数控化改造，重点介绍了机床数控化改造方案的确定，基本步骤，目的，经济合理性，机床数控化改造计算（各种设计参数和结构，机械部分和电气部分）。     

Y型送灰器结构优化实验研究

用一个三因素水平的正交实验，以平均粒径为０．２８７ｍｍ的黄砂为输送物料，以物料输送量为考察指标，对自动调整性的Ｙ型送灰器最重要的结构因素管径、静止料层高度和溢料口高度进行了优化实验研究，结果表明，当静止料层高度为１Ｄ、溢料口高度为５Ｄ时，Ｙ型送灰器取得最佳输送效果。     

应用微机优化计算滚齿机挂轮

选配挂轮是滚齿机加工调整的主要内容之一，但一般计算和查表过程较繁琐，且不一定符合配备齿轮齿数和挂轮架结构尺寸的要求，本文分析了Ｙ３１５０Ｅ齿机挂轮计算的特点，提出一套，优化计算程序、可以快速、准确地同时选出范成运动与差动运动传动链的所需挂轮，并符合机床挂轮架结构尺寸与传动比相对误差最小的要求．     

普通车床的数控化改造

我国现在使用最多的还是CA6140型车床,其设备老化,生产率低。由于资金和技术方面的限制,全部更换成比较先进的数控机床不太可能,所以针对现有条件,对旧机床进行数控化改造,是解决问题的较好途径。在机床的改造中,选用基于linux的开源数控系统,对旧机床的主轴和刀架进行了改造,使其能够适应数控机床多工位、多坐标联动的加工要求。     

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.