9,545 research outputs found
System size dependence of strangeness production at 158 AGeV
Strange particle production in A+A interactions at 158 AGeV is studied by the
CERN experiment NA49 as a function of system size and collision geometry.
Yields of charged kaons, phi and Lambda are measured and compared to those of
pions in central C+C, Si+Si and centrality-selected Pb+Pb reactions. An overall
increase of relative strangeness production with the size of the system is
observed which does not scale with the number of participants. Arguing that
rescattering of secondaries plays a minor role in small systems the observed
strangeness enhancement can be related to the space-time density of the primary
nucleon-nucleon collisions.Comment: 5 pages, 3 figures, Presented at Quark Matter 2002, Nantes, Franc
Fraxinus americana L.
https://thekeep.eiu.edu/herbarium_specimens_byname/15029/thumbnail.jp
Applications of remote sensing to estuarine management : Final report and annual report number 7
Remote sensing techniques have been applied to problems in estuarine management in the seventh and final year of a NASA grant. A chromaticity technique for multi-date Landsat measurement of suspended sediment has been verified and made operational, and applied to sedimentation analysis of the ·Bay of Fundy Tidal Power Project. Dye-buoy photogrannnetry has been used to measure currents at depth and analyze suspended sediment plumes from hydraulic · dredging. Wetland permit sites and beach erosion site\u27s have been evaluated with aerial photography. Submerged aquatic vegetation has been mapped with tide- and wind-synchronized color photography. Virginia state resource monitoring needs have led to implementation of Landsat data p.rocessing capability for joint work with NASA Goddard on demonstration projects. This final report contains summaries and tables of the projects and activities of the Remote Sensing Center over the past seven years
Fraxinus americana L.
https://thekeep.eiu.edu/herbarium_specimens_byname/15029/thumbnail.jp
The Role of Source Coherence in Atom Interferometery
The role of source cloud spatial coherence in a Mach-Zehnder type atom
interferometer is experimentally investigated. The visibility and contrast of a
Bose-Einstein condensate (BEC) and three thermal sources with varying spatial
coherence are compared as a function of interferometer time. At short times,
the fringe visibility of a BEC source approaches 100 % nearly independent of pi
pulse efficiency, while thermal sources have fringe visibilities limited to the
mirror efficiency. More importantly for precision measurement systems, the BEC
source maintains interference at interferometer times significantly beyond the
thermal source
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