8,171 research outputs found
EACOF: A Framework for Providing Energy Transparency to enable Energy-Aware Software Development
Making energy consumption data accessible to software developers is an
essential step towards energy efficient software engineering. The presence of
various different, bespoke and incompatible, methods of instrumentation to
obtain energy readings is currently limiting the widespread use of energy data
in software development. This paper presents EACOF, a modular Energy-Aware
Computing Framework that provides a layer of abstraction between sources of
energy data and the applications that exploit them. EACOF replaces platform
specific instrumentation through two APIs - one accepts input to the framework
while the other provides access to application software. This allows developers
to profile their code for energy consumption in an easy and portable manner
using simple API calls. We outline the design of our framework and provide
details of the API functionality. In a use case, where we investigate the
impact of data bit width on the energy consumption of various sorting
algorithms, we demonstrate that the data obtained using EACOF provides
interesting, sometimes counter-intuitive, insights. All the code is available
online under an open source license. http://github.com/eaco
Controlling internal barrier in low loss BaTiO3 supercapacitors
Supercapacitor behavior has been reported in a number of oxides including reduced BaTiO3 ferroelectric ceramics. These so-called giant properties are however not easily controlled. We show here that the continuous coating of individual BaTiO3 grains by a silica shell in combination with spark plasma sintering is a way to process bulk composites having supercapacitor features with low dielectric losses and temperature stability. The silica shell acts both as an oxidation barrier during the processing and as a dielectric barrier in the final composite
Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars
We investigate anew the distribution of absolute carbon abundance, (C) (C), for carbon-enhanced metal-poor (CEMP) stars in the halo of
the Milky Way, based on high-resolution spectroscopic data for a total sample
of 305 CEMP stars. The sample includes 147 CEMP- (and CEMP-r/s) stars, 127
CEMP-no stars, and 31 CEMP stars that are unclassified, based on the currently
employed [Ba/Fe] criterion. We confirm previous claims that the distribution of
(C) for CEMP stars is (at least) bimodal, with newly determined peaks
centered on (C) (the high-C region) and (C) (the low-C
region). A very high fraction of CEMP- (and CEMP-r/s) stars belong to the
high-C region, while the great majority of CEMP-no stars reside in the low-C
region. However, there exists complexity in the morphology of the (C)-[Fe/H]
space for the CEMP-no stars, a first indication that more than one class of
first-generation stellar progenitors may be required to account for their
observed abundances. The two groups of CEMP-no stars we identify exhibit
clearly different locations in the (Na)-(C) and (Mg)-(C) spaces,
also suggesting multiple progenitors. The clear distinction in (C) between
the CEMP- (and CEMP-) stars and the CEMP-no stars appears to be $as\
successfullikely\ more\ astrophysically\ fundamental$, for the
separation of these sub-classes as the previously recommended criterion based
on [Ba/Fe] (and [Ba/Eu]) abundance ratios. This result opens the window for its
application to present and future large-scale low- and medium-resolution
spectroscopic surveys.Comment: 26pages, 7 figures, and 3 Tables ; Accepted for publication in ApJ;
added more data and corrected minor inconsistencies existed in the compiled
data of the previous studie
Rice genetic marker database: An identification of single nucleotide polymorphism (SNP) and quantitative trait loci (QTL) markers
The National Academy of Agricultural Science (NAAS) has developed a web-based genetic marker system to provide information about SNP and QTL markers in rice. The SNP marker database provides 7,227 SNP markers including location information on chromosomes by using genetic map. It allows users to access a detailed characterization table of 12,829 potential SNPs in 3,356 genes. The QTL marker database provides 175 QTL markers information with 942 polymorphic markers on each of the12 chromosomes in rice. Users are assisted in tracing any new structures of the chromosomes and gene positional functions through comparisons using specific SNP and QTL markers
Screening and inplane magnetoresistance of anisotropic two-dimensional gas
In order to split the influence of the orbital and spin effects on the
inplane magnetoresistance of a quasi two-dimensional gas we derive its linear
response function and dielectric function for the case of anisotropic effective
mass. This result is used for the calculation of elastic transport relaxation
time of a quasi two dimensional system in a parallel magnetic field. The
relaxation time is proved to be isotropic in the low density limit for the case
of charged impurity scattering, allowing to separate the two contributions.Comment: as published. 4 pages, 1 figur
Continuation of angiotensin converting enzyme inhibitors on the day of surgery is not associated with increased risk of hypotension upon induction of general anesthesia in elective non-cardiac surgeries.
C-GOALS II. Chandra Observations of the Lower Luminosity Sample of Nearby Luminous Infrared Galaxies in GOALS
We analyze Chandra X-ray observatory data for a sample of 63 luminous
infrared galaxies (LIRGs), sampling the lower-infrared luminosity range of the
Great Observatories All-Sky LIRG survey (GOALS), which includes the most
luminous infrared selected galaxies in the local universe. X-rays are detected
for 84 individual galaxies within the 63 systems, for which arcsecond
resolution X-ray images, fluxes, infrared and X-ray luminosities, spectra and
radial profiles are presented. Using X-ray and MIR selection criteria, we find
AGN in (315)% of the galaxy sample, compared to the (386)% previously
found for GOALS galaxies with higher infrared luminosities (C-GOALS I). Using
mid-infrared data, we find that (599)% of the X-ray selected AGN in the
full C-GOALS sample do not contribute significantly to the bolometric
luminosity of the host galaxy. Dual AGN are detected in two systems, implying a
dual AGN fraction in systems that contain at least one AGN of (2914)%,
compared to the (1110)% found for the C-GOALS I sample. Through analysis
of radial profiles, we derive that most sources, and almost all AGN, in the
sample are compact, with half of the soft X-ray emission generated within the
inner kpc. For most galaxies, the soft X-ray sizes of the sources are
comparable to those of the MIR emission. We also find that the hard X-ray
faintness previously reported for the bright C-GOALS I sources is also observed
in the brightest LIRGs within the sample, with
L.Comment: 24 pages, 13 figures, 11 tables, accepted for publication in A&
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