Grab and Go Systems: a CPO approach to concurrent web and grid-based computation

A useful property of web–based information systems [1] is the ability to display partial information. For example, a web program can display a sequence of fuzzy images which is extended by the production of improved images as execution of the program proceeds. A sequence of improving approximations to an image can be modelled by the elements of a complete partial order (CPO). CPOs can also be used to model grid-based computations. For example, consider a collection of iterative processes, each with identical functionality, which individually generate a series of improving approximations towards a desired goal. Sharing approximations from time to time among the processes may produce faster convergence than could be achieved by any of the processes separately. Each process in the collection has the potential to exchange partial information with its companions so that all may make use of the best information available.In this paper a non-blocking communication abstraction, based on CPOs, is used to develop a model of iterative web- and grid-based computations. The abstraction is novel in that it may not directly match a send communication in one process with a corresponding receive communication in another; rather, a receive communication is identified with taking the least upper bound of the set of messages available at an input port - this set may be empty, contain exactly one messsage or contain multiple messages. In all cases the receiver does not wait but gathers the best available information and proceeds with its computation. Thus, the abstraction corresponds to a loosely coupled model of distributed computation. The applicability of the model is illustrated by a number of disparate examples of distributed iterative computation.     

添加剂和极板结构对铅酸蓄电池冷起动性能的影响

综述了日本对汽车铅酸蓄电池冷起动性能研究的现状。结果表明，活性物质和电解液中的添加剂、板栅结构及板栅表面处理对电池的低温大电流放电性能有很大的影响。     

铅酸蓄电池铜负极板栅研究综述

综述了铜作为铅酸蓄电池负极板栅材料的研究成果，总结了铜负极板栅的制造工艺、特点、优越性及缺陷，并对其应用前景进行了预测     

用椭圆型方程生成三维贴体与边界正交网格

将Ｈｉｌｇｅｎｓｔｏｃｋ二维求源项方法推广到三维，并实现对内场网格疏密及网格线与边界面夹角的双重控制。生成了翼身融合体近似体形三维贴体边界正交Ｏ－Ｏ网格和旋成体－后掠翼翼身组合三维贴体边界正交Ｏ－Ｃ网格。     

功率MOSFET逆变器在交流伺服系统中的应用

讨论了交流伺服系统中应用功率MOSFET逆变器的意义，并对逆变器的主 电路结构，栅极驱动，过电压吸收电路等问题进行了探讨。     

黑龙江省电网实时数据传输的计算机网络

电网实时数据传输计算机网络是电网调度自动化系统的重要组成部分。在省网调度自动化系统与网内各地区调度自动化系统之间,建立一个传输电网实时信息的计算机通信网络,将具有十分重要的意义。本文在分析了黑龙江省电网调度自动化系统与通信网系统的现状和发展的基础上,对在黑龙江省电网内建立这样的计算机网络的有关问题进行了一些探讨。     

用贴体坐标数值求解拉普拉斯方程

本文对贴体坐标数值求解拉普拉斯方程作一总体介绍,讨论了不同网格类型下在计算平面中如何正确地实现物理边界条件并克服网格类型所带来的不利影响,对于复杂的流动问题建议采用分块网格系统和增加连接网格的方法来提高网格的光滑性。     

封装技术评述

评述了当前封装技术的特点以及应用,介绍了多芯片组件、突点互连技术、球栅阵列、板上芯片、板上倒装芯片和柔性电路板上芯片技术以及片上引线与引线上芯片技术。     

MATHEMATICAL MODEL FOR 2-D TIDAL FLOW AND WATER QUALITY WITH ORTHOGONAL CURVILINEAR COORDINATES

1 .　INTRODUCTIONThedischargeofpollutedwaterisbecominganincreasingthreattotheresourcesintidalareas.Thenumericalsimulatingthe 2 Dtidalflowandwaterqualityisthebasisofwaterresource plan ningandmanagement.Inrecentyears,althoughconsiderableattentionhasbeenfocusedonthisproblem ,thecomputationaldifficultiesinnaturaltidalriversremaintobeabigproblem ,suchasthecomplicatedboundaryconfigurations ,the greatdisparitybetweenlengthandwidth ,etc .Inthefollowing ,a 2 Dnumericalmodelbasedonthealternating…     

预应力索-杆协同网架动力分析

在研究分析了国内外预应力空间钢结构应用和发展的基础上，以一种下弦为预应力索的协同网架为构想，并对其协同工作的机理进行了进一步分析，给出了该协同网架的动力计算思路和方法，并通过该有限元计算方法对其受力规律进行了进一步研究。