2,632 research outputs found
Effective Spectral Function for Quasielastic Scattering on Nuclei
Spectral functions that are used in neutrino event generators to model
quasielastic (QE) scattering from nuclear targets include Fermi gas, Local
Thomas Fermi gas (LTF), Bodek-Ritchie Fermi gas with high momentum tail, and
the Benhar-Fantoni two dimensional spectral function. We find that the
dependence of predictions of these spectral functions for the QE differential
cross sections () are in disagreement with the
prediction of the superscaling function which is extracted from fits to
quasielastic electron scattering data on nuclear targets. It is known that
spectral functions do not fully describe quasielastic scattering because they
only model the initial state. Final state interactions distort the shape of the
differential cross section at the peak and increase the cross section at the
tails of the distribution. We show that the kinematic distributions predicted
by the superscaling formalism can be well described with a modified
{\it {effective spectral function}} (ESF). By construction, models using ESF in
combination with the transverse enhancement contribution correctly predict
electron QE scattering data.Comment: 16 pages, 23 figures, submitted to Eur. Phy. J.
Lexicalization and Grammar Development
In this paper we present a fully lexicalized grammar formalism as a
particularly attractive framework for the specification of natural language
grammars. We discuss in detail Feature-based, Lexicalized Tree Adjoining
Grammars (FB-LTAGs), a representative of the class of lexicalized grammars. We
illustrate the advantages of lexicalized grammars in various contexts of
natural language processing, ranging from wide-coverage grammar development to
parsing and machine translation. We also present a method for compact and
efficient representation of lexicalized trees.Comment: ps file. English w/ German abstract. 10 page
Workplace Accommodations for Individuals with Arthritis
This brochure on individuals with arthritis and the Americans with Disabilities Act (ADA) is one of a series on human resources practices and workplace accommodations for persons with disabilities edited by Susanne M. Bruyère, Ph.D., CRC, SPHR, Director, Program on Employment and Disability, School of Industrial and Labor Relations – Extension Division, Cornell University.
Cornell University was funded in the early 1990’s by the U.S. Department of Education National Institute on Disability and Rehabilitation Research as a National Materials Development Project on the employment provisions (Title I) of the ADA (Grant #H133D10155). These updates, and the development of new brochures, have been funded by Cornell’s Program on Employment and Disability, the Pacific Disability and Business Technical Assistance Center, and other supporters
Anxiety and the Imposter Phenomenon Among Graduate Students in Online Versus Traditional Programs
This study compared online and traditional students on measures of imposter phenomenon (IP), anxiety, and perfectionism. Traditional students had significantly higher IP scores. Perfectionism was the strongest predictor of IP scores. Because the scale for perfectionism explored socially prescribed perfectionism, it seems to suggest an underlying social component to IP.https://scholarworks.waldenu.edu/archivedposters/1074/thumbnail.jp
Spacelab experiment computer study. Volume 2: Study elements and approach
For abstract, see volume 1 N77-13097
Antiquark nuggets as dark matter: New constraints and detection prospects
Current evidence for dark matter in the universe does not exclude heavy
composite nuclear-density objects consisting of bound quarks or antiquarks over
a significant range of masses. Here we analyze one such proposed scenario,
which hypothesizes antiquark nuggets with a range of log10(B) = 24-30 with
specific predictions for spectral emissivity via interactions with normal
matter. We find that, if these objects make up the majority of the dark matter
density in the solar neighborhood, their radiation efficiency in solids is
marginally constrained, due to limits from the total geothermal energy budget
of the Earth. At allowed radiation efficiencies, the number density of such
objects can be constrained to be well below dark matter densities by existing
radio data over a mass range currently not restricted by other methods.Comment: 6 pages, 3 figures, revised references; submitted to PR
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Velocity measurement during evaporation of seeded, sessile drops on heated surfaces
This paper was presented at the 2nd Micro and Nano Flows Conference (MNF2009), which was held at Brunel University, West London, UK. The conference was organised by Brunel University and supported by the Institution of Mechanical Engineers, IPEM, the Italian Union of Thermofluid dynamics, the Process Intensification Network, HEXAG - the Heat Exchange Action Group and the Institute of Mathematics and its Applications.Evaporation of sessile drops has been studied extensively in an attempt to understand the effect of wetting on the evaporation process. Recently interest has also increased in the deposition of particles from such drops, with evaporative mass flux being deemed to be responsible for ring-like deposits and Marangoni convection counteracting this mass flux explaining more uniform deposition patterns. Understanding of such deposition processes is important in ink-jet printing and other micro-scale deposition technologies, where the nature of deposition can have a dramatic effect on the quality or effectiveness of the finished product. In most cases where deposition from evaporating drops has been studied, velocity information is inferred from the final deposition pattern or from mathematical modeling based on simplified models of the physics of the evaporation process. In this study we have directly measured the flow velocities in the base of sessile drops,
using micro-PIV, viewing the drop from below, through the cover slide. The images obtained have also enabled us to observe the formation of holes in the liquid film during the latter stages of evaporation
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