基于Windows平台的开放式并联机床数控系统

以5坐标并联机床为依托,面向不同构型并联机床,采用“PMAC+IPC”双CPU为硬件平台、VisualC++6.0为软件平台,开发了基于Windows操作平台的开放式并联机床数控系统。本文介绍了本数控系统的硬件结构、软件构成,并对数控软件开发的关键技术进行了阐述。

Un ejercicio de estimación del IPC GBA para 2007

Resumen: La comparación del IPC Gran Buenos Aires con el ICP Mendoza se puede llevar a cabo gracias a que esta última presenta una serie extensa. En principio, se arma la estimación de cada índice para analizar las series de IPCGBA e IPCMZA y evaluar la existencia de una semejanza en el comportamiento de ambas que habilite una estimación de aquélla en función de ésta; en segundo lugar, se pretende mostrar el cambio que se produce en el comportamiento de la primera desde enero de 2007. A partir de la información revisada se deduce que ha de ser posible estimar el IPCGBA como función del IPCMZA. Se llevan a cabo estimaciones mensuales y trimestrales donde se incorporan variables binarias para mostrar el cambio estructural. El trabajo muestra que las series del índice de precios al consumidor de los aglomerados Gran Buenos Aires y Gran Mendoza presentan una correlación importante, luego de la comparación de cada modelo planteado.

Daily scale wintertime sea surface temperature and IPC-Navidad variability in the southern Bay of Biscay from 1981 to 2010

The combination of remotely sensed gappy Sea surface temperature (SST) images with the missing data filling DINEOF (data interpolating empirical orthogonal functions) technique, followed by a principal component analysis of the reconstructed data, has been used to identify the time evolution and the daily scale variability of the wintertime surface signal of the Iberian Poleward Current (IPC), or Navidad, during the 1981-2010 period. An exhaustive comparison with the existing bibliography, and the vertical temperature and salinity profiles related to its extremes over the Bay of Biscay area, show that the obtained time series accurately reflect the IPC-Navidad variability. Once a time series for the evolution of the SST signal of the current over the last decades is well established, this time series is used to propose a physical mechanism in relation to the variability of the IPC-Navidad, involving both atmospheric and oceanic variables. According to the proposed mechanism, an atmospheric circulation anomaly observed in both the 500 hPa and the surface levels generates atmospheric surface level pressure, wind-stress and heat-flux anomalies. In turn, those surface level atmospheric anomalies induce mutually coherent SST and sea level anomalies over the North Atlantic area, and locally, in the Bay of Biscay area. These anomalies, both locally over the Bay of Biscay area and over the North Atlantic, are in agreement with several mechanisms that have separately been related to the variability of the IPC-Navidad, i.e. the south-westerly winds, the joint effect of baroclinicity and relief (JEBAR) effect, the topographic beta effect and a weakened North Atlantic gyre.

PMAC在开放式数控绕丝机系统中的应用

本文在分析开放式数控系统特点及实现途径的基础上,结合开放式数控绕丝机的研制和开发,阐述了该系统的设计原则,讨论了基于PC机+PMAC+PLC的系统结构,分析了该系统软件设计特点。工程实践表明,基于PMAC的开放式数控系统性能稳定可靠、成本低廉,具有实际应用价值,值得推广使用。

并联结构制造装备设计理论与建模方法研究

并联结构制造装备（Parallel Kinematic Machine简称PKM）是近年发展起来的一种新型制造装备，它以承载能力强、动态性能好、刚度重量比大等优点而受到广大学者及机床制造商的重视并正在成为制造领域的一个研究热点。本文就有关PKM的结构、位置分析、速度关系、工作空间分析、奇异位形分析以及标定方法等问题进行了深入的研究，具体内容包括以下几个方面：1．根据现有PKM的结构特点，将它们划分为“腿伸缩”的6条腿结构、“腿滑动’夕的6条腿结构、“腿伸缩”的3条腿结构、“腿滑动”的3条腿结构等类型，这种划分佩方面能够较准确地反映PK.M的结构特征以及复杂程度，另一方面也易于为广大工程技术人员理解和使用。2．将少自由度并联机构分为满阶机构以及欠阶机构，而欠阶机构又进一步分为非期望输出为常量和非期望输出为变量两种类型，这样的分类反映了机构的本质特征以及对其进行研究的复杂程度。3．提出利用演化关系研究各种典型并联机构之间的内在联系，建立了一些典型并联机构之间的演化关系，为利用演化关系进行并联机构的运动学性能分析奠定了基础。根据演化原理，提出了几种实现两维平动、两维转动的4自由度 (2T-2R, 4-DOF）并联机构新构型，并用杆一副关系图进行描述。4．基于机构演化关系建立了典型并联机构位置分析数学描述的统一表达形式，并对所提出的几种2T-2R, 4-DOF并联机构的位置正、逆解进行了详细的讨论。对并联机构速度、静力传递关系的对偶性以及串联与并联之间的对偶关系进行了总结。5．提出具有灵巧度指标要求的适用工作空间概念，对考虑灵巧度指标要求的全姿态工作空间的确定进行了详细分析，给出了几种机构工作空间求解的具体结果。分析了现有奇异位形分析方法应用于少自由度并联机构时可能会出现的问题，并基于前面所述机构演化关系，提出一种进行少自由度并联机构奇异位形分析的新途径。6.分析了PKM运动学标定的研究现状，提出了一种新的运动学参数识别方法。该方法利用运动学逆解模型建立目标函数，并且不需要测量运动平台的姿态参数。7.初步完成了一个适用于PKM的基于“IPC+PMAC”的双CPU开放式数控系统的开发。对于不同构型的PKM，可以方便地更换虚实空间映射模块，并方便地扩展各种新的功能模块。通过本文的工作，对并联结构制造装备的若干问题进行了系统的研究，为新型并联结构制造装备研究和走向工程应用提供了设计思想、建模方法和关键技术，对于推进并联结构制造装备的发展具有重要意义。

基于PMAC开放式数控系统软件开发

基于PC和多轴运动控制器的开放式数控系统是理想的开放式数控系统。介绍了基于PMAC的开放式数控系统结构形式,PMAC的差补、位置控制、伺服功能、以PMAC和PC机为硬件平台搭建了数控系统,并对其硬件构成和软件设计结构进行了分析。着重从软件设计的角度,介绍了PTALK控件的功能和作用,对数控系统软件构成进行了详细的阐述。并设计出了友好的用户界面,在实际应用中具有重要意义。

"Networking is IPC": A Guiding Principle to a Better Internet

This position paper outlines a new network architecture, i.e., a style of construction that identifies the objects and how they relate. We do not specify particular protocol implementations or specific interfaces and policies. After all, it should be possible to change protocols in an architecture without changing the architecture. Rather we outline the repeating patterns and structures, and how the proposed model would cope with the challenges faced by today's Internet (and that of the future). Our new architecture is based on the following principle: Application processes communicate via a distributed inter-process communication (IPC) facility. The application processes that make up this facility provide a protocol that implements an IPC mechanism, and a protocol for managing distributed IPC (routing, security and other management tasks). Existing implementation strategies, algorithms, and protocols can be cast and used within our proposed new structure.

EL IPC en la vida cotidiana

Resumen basado en el de la publicaci??n

Una aproximaci?? a l'IPC. 'Una aproximaci??n al IPC'

Fecha tomada del ??rea de publicaci??n

Una necesidad : el estudio del IPC

Se abordan una serie de consideraciones referidas a la importancia del trabajo con cierto tipo de indicadores estad??sticos en las Escuelas de Magisterio. Ello se sustenta en dos poderosas razones, la una complementaria de la otra: la enorme trascendencia social de su uso y la gran frecuencia con la que aparecen en todos los medios de comunicaci??n. De los indicadores referidos hay uno que es m??s notorio: se trata del ??ndice de Precios al Consumo. El estudio en este indicador se hace m??s relevante ya que est?? presente en todos los aspectos de nuestra vida.

Repensando a metodologia do Índice de Potencial de Consumo (IPC) para estudos sobre consumo nas cidades medias

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Repensando a metodologia do Índice de Potencial de Consumo (IPC) para estudos sobre consumo nas cidades medias

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

[Effectiveness of intermittent pneumatic compression (IPC) on thrombosis prophylaxis: a systematic literature review]

Despite changes in patient demographics and short-ened length of hospital stay deep vein thrombosis (DVT) remains a major health care problem which may lead to a variety of other high risk complications. Current treatment guidelines focus on preventive measures. Beside drug therapy, physical measures executed by nursing professionals exist, the outcomes of which are discussed controversially. Based on 25 studies that were found in MEDLINE and the Cochrane library, this systematic literature review identifies the effectiveness of intermittent pneumatic compression (IPC) on thrombosis prophylaxis. In almost all medical settings IPC contributes to a significant reduction of the incidence of DVT. At the same time, IPC has minimal negative side effects and is also cost effective. Correct application of IPC and patient compliance are essential to achieve its effectiveness. An increased awareness within the healthcare team in identifying the risk for and implementing measures against DVT is needed. Guidelines need to be developed in order to improve the effectiveness of thrombosis prophylaxis with the implementation of IPC.