BESⅢ在线事例选择流程控制

BESⅢ在线数据获取系统的事例筛选将使用软件的方法进行实时事例选择,把事例率降低到3 kH z以下。遵循尽可能重用BESⅢ离线数据处理软件的原则,根据在线事例选择的要求,开发了BESⅢ事例选择流程控制软件。初步测试表明事例选择流程控制软件可以成功地和数据获取系统集成,并且满足BESⅢ实验的基本要求。

艺术造型音箱的时尚魅力

说起音箱的外形,人们长期以来早已习惯了中规中矩的长方形的音箱.也许一些音箱设计家认为只有用长方形外形的音箱才能打造出音质一流的音箱来.事实也的确如此,不但几百元一对的音箱大都是长方形音箱,而且连几十万元一对的超高档音箱也概不例外.

Integration of Geant4 with the Gaudi Framework

The GAUDI software framework is to be used for all event-processing applications in the LHCb experiment.The GEANT4 toolkit has been integrated into GAUDI to form the basis of the LHCb simulation program GAUSS.The benefits of this approach are that it permits re-use of basic services,such as persistency,interactivity and data visualization,as well as physics algorithms that were originally developed in the context of the reconstruction and analysis programs.Following the GAUDI philosophy,the integration has been achieved by developing a number of services with abstract interfaces that can be plugged in at run-time.We describe the overall design and details of the components for interfacing the detector geometry,the primary interaction and the output from tracking particles through the detector.

Adding a Scripting Interface to Gaudi

Athena,the Software Framework for ATLAS' offline software is based on the Gaudi Framework from LHCb^1,The Processing Model of Gaudi is essentially that of a batch-oriented system -a User prepares a file detailing the configuration of which Algorithms are to be applied to the input data of a job and the parameter values that control the behavior of each Algorithm instance.The Framework then reads that file once at the beginning of a job and runs to completion with no further interaction with the User. We have enhanced the Processing Model to include an interactive mode where a User can cotrol the event loop of a running job and modify the Algorithms and parameters on the fly.We changed only a very small number of Gaudi Classes to provide access to parameters from an embedded Python interpreter,No change was made to the Gaudi Programming Model.i.e., developers need not change anything to make use of this added interface,We present details of the design and implementation of the interactive Python interface for Athena.

Status of the GAUDI Event—Processing Framework

The GAuDI architecture and framework are designed to provide a comon infrastructure and environment for simulation,filtering,reconstruction and analysis applications.Initially developed for the LHCb experiment,GAUDI has been adopted and extended by the ATLAS experiment and adopted by several other experiments including GLAST and HARP.we describe the properties and concepts embodied by GAUDI and recent functionality additions and how the project has evolved from a product developed by a tightly-knit team in a single site,to a collaboration between multiple teams at geographically dispersed sites,based loosely on open source concepts.We describe the management infrastructure as well as how we accommodate experment -specific extensions and adaptations as well as an experiment-neutral kernel.

Cosmos Gaudi:Architecture,Geometry and Design

■In order to promote cultural and industrial ties between Spain and China, 2007 has been deemed the'Year of

基于GAUDI框架的原始数据管理系统

主要阐述了原始数据管理系统的基本原理.原始数据管理系统主要完成在线获得的原始数据字节流格式和适合GAUDI框架中瞬态数据缓存(Transient Data Store)存取的格式之间的转换工作。整个实现过程基于GAUDI框架,采用了面向对象设计模式,因此整个系统有很好的灵活性和可维护性.