8,909 research outputs found
Grounding semantic web services with rules
Semantic web services achieve effects in the world through web services, so the connection to those services - the grounding - is of paramount importance. The established technique is to use XML-based translations between ontologies and the SOAP message formats of the services, but these mappings cannot address the growing number of non-SOAP services, and step outside the ontological world to describe the mapping. We present an approach which draws the service's interface into the ontology: we define ontology objects which represent the whole HTTP message, and use backward-chaining rules to translate between semantic service invocation instances and the HTTP messages passed to and from the service. We present a case study using Amazon's popular Simple Storage Service
TECHNOLOGICAL CHANGE IN MEAT AND POULTRY-PACKING AND PROCESSING
Nonparametric procedures are used to compare technological change in SIC 2011, meatpacking, and SIC 2015, poultry slaughter and processing. There has been a greater increase in total factor productivity in poultry than in the red meats. Evidence also suggests recent differences in the bias of this technological change, with production changes being labor using in poultry and biased towards greater efficiency in the use of live animal inputs in meatpacking.Red meat, Poultry, Meatpacking, Technological change, Nonparametric analysis, Livestock Production/Industries, Research and Development/Tech Change/Emerging Technologies,
A COMPARISON OF DEPARTMENTAL TEACHING EFFICIENCY IN THE COLLEGE OF AGRICULTURE, FOOD SYSTEMS, AND NATURAL RESOURCES: AY2000-AY2004
Teaching efficiency is investigated for the nine departments in the College of Agriculture, Food Systems, and Natural Resources at North Dakota State University. Using Data Envelopment Analysis, departments are compared to their College peers in converting teaching faculty and teaching funds into three teaching outputs: student credit hours generated, undergraduate majors, and graduate students. Most departments are efficient in the technical conversion of inputs to outputs under variable returns to scale. Scale effects are evident, indicating some departments consistently extract higher average productivity from inputs in servicing undergraduate majors, graduate students, and in generating student credit hours.Teaching/Communication/Extension/Profession,
Atmospheric composition of weak G band stars: CNO and Li abundances
We determined the chemical composition of a large sample of weak G band stars
-- a rare class of G and K giants of intermediate mass with unusual abundances
of C, N, and Li. We have observed 24 weak G band stars with the 2.7 m Harlan J.
Smith Telescope at the McDonald Observatory and derived spectroscopic
abundances for C, N, O, and Li, as well as for selected elements from Na - Eu.
The results show that the atmospheres of weak G band stars are highly
contaminated with CN-cycle products. The C underabundance is about a factor of
20 larger than for normal giants and the C/C ratio approaches the
CN-cycle equilibrium value. In addition to the striking CN-cycle signature the
strong N overabundance may indicate the presence of partially ON-cycled
material in the atmospheres of the weak G band stars. The exact mechanism
responsible for the transport of the elements to the surface has yet to be
identified but could be induced by rapid rotation of the main sequence
progenitors of the stars. The unusually high Li abundances in some of the stars
are an indicator for Li production by the Cameron-Fowler mechanism. A
quantitative prediction of a weak G band star's Li abundance is complicated by
the strong temperature sensitivity of the mechanism and its participants. In
addition to the unusual abundances of CN-cycle elements and Li we find an
overabundance of Na that is in accordance with the NeNa chain running in
parallel with the CN-cycle. Apart from these peculiarities the element
abundances in a weak G band star's atmosphere are consistent with those of
normal giants.Comment: 18 pages, 18 figures, accepted for publication in Ap
Carbon and Oxygen abundances across the Hertzsprung gap
We derived atmospheric parameters and spectroscopic abundances for C and O
for a large sample of stars located in the Hertzsprung gap in the
Hertzsprung-Russell Diagram in order to detect chemical peculiarities and get a
comprehensive overview of the population of stars in this evolutionary state.
We have observed and analyzed high resolution spectra (R = 60 000) of 188 stars
in the mass range 2 - 5 Msun with the 2.7 m Harlan J. Smith Telescope at the
McDonald Observatory including 28 stars previously identified as Am/Ap stars.
We find that the C and O abundances of the majority of stars in the Hertzsprung
gap are in accordance with abundances derived for local lower mass dwarfs but
detect expected peculiarities for the Am/Ap stars. The C and O abundances of
stars with Teff < 6500 K are slightly lower than for the hotter objects but the
C/O ratio is constant in the analyzed temperature domain. No indication of an
alteration of the C and O abundances of the stars by mixing during the
evolution across the Hertzsprung gap could be found before the homogenization
of their atmospheres by the first dredge-up.Comment: 13 pages, 12 figures, accepted for publication in the Astrophysical
Journa
Dyonic Instantons in Five Dimensional Gauge Theories
We show that there exist finite energy, non-singular instanton solutions for
five-dimensional theories with broken gauge symmetry. The soliton is supported
against collapse by a non-zero electric charge. The low-energy dynamics of
these solutions is described by motion on the ADHM moduli space with potential.Comment: 9 pages. Latex. Minor typos, including correction to final equatio
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