338 research outputs found
Study of cryogenic fluid mixing techniques. Volume 1 - Large-scale experimental mixing investigations and liquid-oxygen mixer design Final report
Large-scale experimental liquid hydrogen mixing and liquid oxygen mixer desig
Study of cryogenic fluid mixing techniques. Volume 3 - Computer procedure for the prediction of stratification in super critical oxygen tanks Final report, Jul. 1969 - Jul. 1970
Computer program for prediction of stratification in supercritical oxygen tank
From logical forms to SPARQL query with GETARUNS
We present a system for Question Answering which computes a
prospective answer from Logical Forms produced by a full-fledged NLP for
text understanding, and then maps the result onto schemata in SPARQL to be
used for accessing the Semantic Web. As an intermediate step, and whenever
there are complex concepts to be mapped, the system looks for a corresponding
amalgam in YAGO classes. It is just by the internal structure of the Logical
Form that we are able to produce a suitable and meaningful context for concept
disambiguation. Logical Forms are the final output of a complex system for text
understanding - GETARUNS - which can deal with different levels of syntactic
and semantic ambiguity in the generation of a final structure, by accessing
computational lexical equipped with sub-categorization frames and appropriate
selectional restrictions applied to the attachment of complements and adjuncts.
The system also produces pronominal binding and instantiates the implicit
arguments, if needed, in order to complete the required Predicate Argument
structure which is licensed by the semantic component
Cell transformation assays for prediction of carcinogenic potential: State of the science and future research needs
Copyright @ 2011 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Cell transformation assays (CTAs) have long been proposed as in vitro methods for the identification of potential chemical carcinogens. Despite showing good correlation with rodent bioassay data, concerns over the subjective nature of using morphological criteria for identifying transformed cells and a lack of understanding of the mechanistic basis of the assays has limited their acceptance for regulatory purposes. However, recent drivers to find alternative carcinogenicity assessment methodologies, such as the Seventh Amendment to the EU Cosmetics Directive, have fuelled renewed interest in CTAs. Research is currently ongoing to improve the objectivity of the assays, reveal the underlying molecular changes leading to transformation and explore the use of novel cell types. The UK NC3Rs held an international workshop in November 2010 to review the current state of the art in this field and provide directions for future research. This paper outlines the key points highlighted at this meeting
Polarizing a stored proton beam by spin flip?
We discuss polarizing a proton beam in a storage ring, either by selective
removal or by spin flip of the stored ions. Prompted by recent, conflicting
calculations, we have carried out a measurement of the spin flip cross section
in low-energy electron-proton scattering. The experiment uses the cooling
electron beam at COSY as an electron target. The measured cross sections are
too small for making spin flip a viable tool in polarizing a stored beam. This
invalidates a recent proposal to use co-moving polarized positrons to polarize
a stored antiproton beam.Comment: 18 pages, 6 figure
Relativistic quantum dynamics in strong fields: Photon emission from heavy, few-electron ions
Recent progress in the study of the photon emission from highly-charged heavy
ions is reviewed. These investigations show that high- ions provide a unique
tool for improving the understanding of the electron-electron and
electron-photon interaction in the presence of strong fields. Apart from the
bound-state transitions, which are accurately described in the framework of
Quantum Electrodynamics, much information has been obtained also from the
radiative capture of (quasi-) free electrons by high- ions. Many features in
the observed spectra hereby confirm the inherently relativistic behavior of
even the simplest compound quantum systems in Nature.Comment: Version 18/11/0
A Catching Trap for All Antiproton Seasons
We describe the origin, development, and status of the Los Alamos antiproton
catching trap. Originally designed for the antiproton gravity experiment, it
now is clear that this device can be a source of low-energy antiprotons for a
wide range of physics, both on site, at CERN, and also off site.Comment: 18 pages, LaTeX, 6 figures available upon request, In honor of
Herbert Walthe
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