1,052 research outputs found
Powder/die friction in the spark plasma sintering process: Modelling and experimental identification
The powder/die friction phenomenon is known to generate densification inhomogeneities in the spark plasma sintered sample. The measurement of a powder/solid friction coefficient at high temperature is very difficult if not impossible by classical means. Then, an experimental/simulation method of identification of the friction coefficient based on the sample displacement field is introduced. This reveals that the friction of contact type powder/wall is low and about 0.1 and the friction type powder/graphite-foil/wall is close to zero. The relative density inhomogeneities are limited to a maximum difference of 3%
CASTOR status and evolution
In January 1999, CERN began to develop CASTOR ("CERN Advanced STORage
manager"). This Hierarchical Storage Manager targetted at HEP applications has
been in full production at CERN since May 2001. It now contains more than two
Petabyte of data in roughly 9 million files. In 2002, 350 Terabytes of data
were stored for COMPASS at 45 MB/s and a Data Challenge was run for ALICE in
preparation for the LHC startup in 2007 and sustained a data transfer to tape
of 300 MB/s for one week (180 TB). The major functionality improvements were
the support for files larger than 2 GB (in collaboration with IN2P3) and the
development of Grid interfaces to CASTOR: GridFTP and SRM ("Storage Resource
Manager"). An ongoing effort is taking place to copy the existing data from
obsolete media like 9940 A to better cost effective offerings. CASTOR has also
been deployed at several HEP sites with little effort. In 2003, we plan to
continue working on Grid interfaces and to improve performance not only for
Central Data Recording but also for Data Analysis applications where thousands
of processes possibly access the same hot data. This could imply the selection
of another filesystem or the use of replication (hardware or software).Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics
(CHEP03), La Jolla, Ca, USA, March 2003, 2 pages, PDF. PSN TUDT00
Report drawn up on behalf of the Committee on Social Affairs and Employment on the Communication from the Commission of the European Communities to the Council (Doc. 314/73): Community Action Programme "employment of handicapped persons in an open market economy". EP Working Document, Document 1973-1974 353/73, 11 February 1974
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