61,288 research outputs found
Infrared Astronomical Satellite (IRAS) Scientific Data Analysis System
The Jet Propulsion Laboratory's Scientific Data Analysis System will process Infrared Astronomical Satellite data and produce a catalog of perhaps a million infrared sources in the sky, as well as other vital information for astronomical research
Analysis of the conditional mutual information in ballistic and diffusive non-equilibrium steady-states
The conditional mutual information (CMI)
quantifies the amount of correlations shared between and \emph{given}
. It therefore functions as a more general quantifier of bipartite
correlations in multipartite scenarios, playing an important role in the theory
of quantum Markov chains. In this paper we carry out a detailed study on the
behavior of the CMI in non-equilibrium steady-states (NESS) of a quantum chain
placed between two baths at different temperatures. These results are used to
shed light on the mechanisms behind ballistic and diffusive transport regimes
and how they affect correlations between different parts of a chain. We carry
our study for the specific case of a 1D bosonic chain subject to local Lindblad
dissipators at the boundaries. In addition, the chain is also subject to
self-consistent reservoirs at each site, which are used to tune the transport
between ballistic and diffusive. As a result, we find that the CMI is
independent of the chain size in the ballistic regime, but decays
algebraically with in the diffusive case. Finally, we also show how this
scaling can be used to discuss the notion of local thermalization in
non-equilibrium steady-states
The ultra-compact binary candidate KUV 23182+1007 is a bright quasar
KUV 23182+1007 was identified as a blue object in the Kiso UV Survey in the
1980s. Classification-dispersion spectroscopy showed a featureless continuum
except for a strong emission line in the region of He II 4686 A. This is a
hallmark of the rare AM CVn class of cataclysmic variable star, so we have
obtained a high-S/N blue spectrum of this object to check its classification.
Instead, the spectrum shows a strong quasar-like emission line centred on 4662
A. Comparison with the SDSS quasar template spectra confirms that KUV
23182+1007 is a quasar with a redshift of z = 0.665.Comment: 4 pages, 2 figures, to appear in IBVS. Data are available from
http://www.astro.keele.ac.uk/~jkt
Determining Pesticide and Nitrate Levels in Spring Water in Northwest Arkansas
Occurrences of pesticides in our nations ground water are on the rise. As states become aware of this problem and begin monitoring programs, incidence of contamination will probably increase. Since the problem of pesticides in groundwater is relatively new, little research has centered on the fate of pesticides after they reach the groundwater environment. In Northwest Arkansas efforts to monitor groundwater for pesticides have been small. Twenty-five springs in Northwest Arkansas were sampled in the fall of 1988, and spring of 1989. Analysis for atrazine, alachlor, metolachlor, diuron, and simazine in spring water was preformed using gas liquid chromatography and high performance liquid chromatography. No detectable residues of any of the selected pesticides were found. Northwest Arkansas is a leader in poultry production. Much of the manure from poultry houses is spread on the sourounding pastures. As this litter decomposes nitrates and phosphates are released. Nitrate and phosphate concentrations were also determined on water from the spring samples. No spring exceeded the EPA\u27s limit of 45 mg/L for nitrate in drinking water. The highest concentration for phosphate in any spring was 1.05 mg/L
ASSESSMENT OF RISK WHEN CONTRACT CROPS ARE INCLUDED AMONG OTHER CROP ALTERNATIVES
Crop Production/Industries, Risk and Uncertainty,
Relatedness Measures to Aid the Transfer of Building Blocks among Multiple Tasks
Multitask Learning is a learning paradigm that deals with multiple different
tasks in parallel and transfers knowledge among them. XOF, a Learning
Classifier System using tree-based programs to encode building blocks
(meta-features), constructs and collects features with rich discriminative
information for classification tasks in an observed list. This paper seeks to
facilitate the automation of feature transferring in between tasks by utilising
the observed list. We hypothesise that the best discriminative features of a
classification task carry its characteristics. Therefore, the relatedness
between any two tasks can be estimated by comparing their most appropriate
patterns. We propose a multiple-XOF system, called mXOF, that can dynamically
adapt feature transfer among XOFs. This system utilises the observed list to
estimate the task relatedness. This method enables the automation of
transferring features. In terms of knowledge discovery, the resemblance
estimation provides insightful relations among multiple data. We experimented
mXOF on various scenarios, e.g. representative Hierarchical Boolean problems,
classification of distinct classes in the UCI Zoo dataset, and unrelated tasks,
to validate its abilities of automatic knowledge-transfer and estimating task
relatedness. Results show that mXOF can estimate the relatedness reasonably
between multiple tasks to aid the learning performance with the dynamic feature
transferring.Comment: accepted by The Genetic and Evolutionary Computation Conference
(GECCO 2020
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