7,474 research outputs found
LANDSAT language at our reach. First Swedish satellite. Civilization detectors
Information on the use of LANDSAT data by Argentina is presented. Details on a Swedish satellite to be completed in 1984 and to be called VIKING are reported. Attempts to contact other civilizations in space by the use of radiotelescopes are discussed
Multivectorial strategy to interpret a resistive behaviour of loads in smart buildings
In Smart buildings, electric loads are affected by an
important distortion in the current and voltage waveforms,
caused by the increasing proliferation of non linear electronic
devices. This paper presents an approach on non sinusoidal
power theory based on Geometric Algebra that clearly improves
traditional methods in the optimization of apparent power and
power factor compensation. An example is included that
demonstrates the superiority of this approach compared with
traditional methods.Universidad de Málaga. Campus de Excelencia Internacional AndalucĂa Tech
A LINEAR PROGRAMMING ANALYSIS OF ECONOMIES OF SIZE AND PROFITABILITY IN VEGETABLE PRODUCTION
Crop Production/Industries,
Higher order correction to the neutrino self-energy in a medium and its astrophysical applications
We have calculated the 1/M^4 (M the vector boson mass) order correction to
the neutrino self-energy in a medium. The possible application of this higher
order contribution to the neutrino effective potential is considered in the
context of the Early Universe hot plasma and of the cosmological Gamma Ray
Burst fireball. We found that, depending on the medium parameters and on the
neutrino properties (mixing angle and mass square difference) the resonant
oscillation of active to active neutrinos is possible.Comment: 10 pages, revtex style, uses axodraw.sty, 1 figur
A Characterization of concave mappings
This study focuses on Concave mappings, a class of univalent functions that
exhibit a unique property: they map the unit disk onto a domain whose
complement is convex. The main objective of this work is to characterize these
mappings in terms of the real part of the expression ,
considering scenarios where the omitted convex domain is either bounded or
unbounded. In the case of a bounded convex domain, we investigate the pivotal
role played by the Schwarzian derivative and the order of the functions in
understanding the behavior and properties of these mappings
Type Ia Supernova Scenarios and the Hubble Sequence
The dependence of the Type Ia supernova (SN Ia) rate on galaxy type is
examined for three currently proposed scenarios: merging of a
Chandrasekhar--mass CO white dwarf (WD) with a CO WD companion, explosion of a
sub--Chandrasekhar mass CO WD induced by accretion of material from a He star
companion, and explosion of a sub--Chandrasekhar CO WD in a symbiotic system.
The variation of the SNe Ia rate and explosion characteristics with time is
derived, and its correlation with parent population age and galaxy redshift is
discussed. Among current scenarios, CO + He star systems should be absent from
E galaxies. Explosion of CO WDs in symbiotic systems could account for the SNe
Ia rate in these galaxies. The same might be true for the CO + CO WD scenario,
depending on the value of the common envelope parameter. A testable prediction
of the sub--Chandrasekhar WD model is that the average brightness and kinetic
energy of the SN Ia events should increase with redshift for a given Hubble
type. Also for this scenario, going along the Hubble sequence from E to Sc
galaxies SNe Ia events should be brighter on average and should show larger
mean velocities of the ejecta. The observational correlations strongly suggest
that the characteristics of the SNe Ia explosion are linked to parent
population age. The scenario in which WDs with masses below the Chandrasekhar
mass explode appears the most promising one to explain the observed variation
of the SN Ia rate with galaxy type together with the luminosity--expansion
velocity trend.Comment: 16 pages uuencoded compressed Postscript, 2 figures included. ApJ
Letters, in pres
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