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- Augustin, Ingo, et al.
(författare)
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HEP Applications Evaluation of the EDG Testbed and Middleware
- 2003
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Konferensbidrag (refereegranskat)abstract
- Workpackage 8 of the European Datagrid project was formed in January 2001 with representatives from the four LHC experiments, and with experiment independent people from five of the six main EDG partners. In September 2002 WP8 was strengthened by the addition of effort from BaBar and D0. The original mandate of WP8 was, following the definition of short- and long-term requirements, to port experiment software to the EDG middleware and testbed environment. A major additional activity has been testing the basic functionality and performance of this environment. This paper reviews experiences and evaluations in the areas of job submission, data management, mass storage handling, information systems and monitoring. It also comments on the problems of remote debugging, the portability of code, and scaling problems with increasing numbers of jobs, sites and nodes. Reference is made to the pioneeering work of Atlas and CMS in integrating the use of the EDG Testbed into their data challenges. A forward look is made to essential software developments within EDG and to the necessary cooperation between EDG and LCG for the LCG prototype due in mid 2003.
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- Bierschenk, Inger, et al.
(författare)
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Diagnose der Leistungsheterogenität durch die Perspektivische Textanalyse: VERTEX
- 2004
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Ingår i: Heterogenität: Eine Herausforderung an die Bildungsforschung [Heterogeneity: A Challenge to Educational Research]. - 9783830913931 - 3830913931 ; , s. 16-28
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The basic hypothesis is that mind is an emergent property of the processes that produce natural language expressions. The shape of the mind of a particular person can be discovered through the mechanisms forming the corresponding language space. Although covered by textual surface properties, this space is approachable with VERTEX, which is a new version of Perspective Text Analysis (PTA). Due to the Agent-action-Objective (AaO) axiom, it has been possible to discover the underlying biological clocking mode. Rhythmic working of the [AaO] units is responsible for the textual embodiment of the shapes and the emergence of various orders of complexity. The space hypothesis is validated in that distinct shapes evolve and reflect individual differences in sensibility to structural change. Some results of the first experimental outcome have been used to illustrate the validity of the basic hypothesis. Two students have been discerned and followed. The structure mediated through the students’ responses pertains either to a descriptive dimension (analytic sensibility) or to a reflective dimension (synthetic sensibility). This individual ability to apprehend structural information appears to remain over time. Hence, the individual attunes his perceptions in agreement with the predetermined order of an analytic or a synthetic mind.
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- Van der Plicht, J, et al.
(författare)
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The Preboreal climate reversal and a subsequent solar-forced climate shift
- 2004
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Ingår i: Journal of Quaternary Science. - : Wiley. - 1099-1417 .- 0267-8179. ; 19:3, s. 263-269
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Tidskriftsartikel (refereegranskat)abstract
- Accurate chronologies are essential for linking palaeoclimate archives. Carbon-14 wiggle-match dating was used to produce an accurate chronology for part of an early Holocene peat sequence from the Borchert (The Netherlands). Following the Younger Dryas-Preboreal transition, two climatic shifts could be inferred. Around 11 400 cal. yr BP the expansion of birch (Betula) forest was interrupted by a dry continental phase with dominantly open grassland vegetation, coeval with the PBO (Preboreal Oscillation), as observed in the GRIP ice core. At 11 250 cal. yr BP a sudden shift to a humid climate occurred. This second change appears to be contemporaneous with: (i) a sharp increase of atmospheric C-14; (ii) a temporary decline of atmospheric CO2; and (iii) an increase in the GRIP Be-10 flux. The close correspondence with excursions of cosmogenic nuclides points to a decline in solar activity, which may have forced the changes in climate and vegetation at around 11 250 cal. yr BP. Copyright (C) 2004 John Wiley Sons, Ltd.
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