26,576 research outputs found
Thermal Model Analysis of Particle Ratios at GSI Ni-Ni Experiments Using Exact Strangeness Conservation
The production of hadrons in Ni-Ni at the GSI is considered in a hadronic gas
model with chemical equilibrium. Special attention is given to the abundance of
strange particles which are treated using the exact conservation of
strangeness. It is found that all the data can be described using a temperature
T = 70 pm 10 MeV and a baryon chemical potential mu_B = 720 pm 20 MeV.Comment: Revtex, 7 pages, 3 figures in postscript forma
Study of low gravity propellant transfer Quarterly progress report, 23 Dec. 1970 - 30 Apr. 1971
Bellows, metallic diaphragm, and paddle vortex subcritical transfer systems designs and high pressure systems analyses for orbital space station cryogen
Using gamma regression for photometric redshifts of survey galaxies
Machine learning techniques offer a plethora of opportunities in tackling big
data within the astronomical community. We present the set of Generalized
Linear Models as a fast alternative for determining photometric redshifts of
galaxies, a set of tools not commonly applied within astronomy, despite being
widely used in other professions. With this technique, we achieve catastrophic
outlier rates of the order of ~1%, that can be achieved in a matter of seconds
on large datasets of size ~1,000,000. To make these techniques easily
accessible to the astronomical community, we developed a set of libraries and
tools that are publicly available.Comment: Refereed Proceeding of "The Universe of Digital Sky Surveys"
conference held at the INAF - Observatory of Capodimonte, Naples, on
25th-28th November 2014, to be published in the Astrophysics and Space
Science Proceedings, edited by Longo, Napolitano, Marconi, Paolillo, Iodice,
6 pages, and 1 figur
A Radon Progeny Deposition Model
The next generation low-background detectors operating underground aim for
unprecedented low levels of radioactive backgrounds. Although the radioactive
decays of airborne radon (particularly Rn-222) and its subsequent progeny
present in an experiment are potential backgrounds, also problematic is the
deposition of radon progeny on detector materials. Exposure to radon at any
stage of assembly of an experiment can result in surface contamination by
progeny supported by the long half life (22 y) of Pb-210 on sensitive locations
of a detector. An understanding of the potential surface contamination from
deposition will enable requirements of radon-reduced air and clean room
environments for the assembly of low background experiments. It is known that
there are a number of environmental factors that govern the deposition of
progeny onto surfaces. However, existing models have not explored the impact of
some environmental factors important for low background experiments. A test
stand has been constructed to deposit radon progeny on various surfaces under a
controlled environment in order to develop a deposition model. Results from
this test stand and the resulting deposition model are presented.Comment: Proceedings of the Topical Workshop in Low Radioactivity Techniques,
(Sudbury, Canada) August 28-29, 201
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