Buscar
Mostrando ítems 1-10 de 102
Determination of the Signal Fluctuation Threshold of the Temperature-Ion Composition Ambiguity Problem Using Monte Carlo Simulations
(Blackwell, 2019)
Unambiguously estimating the plasma parameters of the ionosphere at altitudes between 130 and 300 km presents a problem for the incoherent scatter radar (ISR). At these ranges, ISR is unable to distinguish between different ...
Performance evaluation of the particle swarm optimization algorithm to unambiguously estimate plasma parameters from incoherent scatter radar signals
(Springer, 2020)
Simultaneously estimating plasma parameters of the ionosphere presents a problem for the incoherent scatter radar
(ISR) technique at altitudes between ~ 130 and ~ 300 km. Different mixtures of ion concentrations and ...
Faint emission lines in the Galactic HII regions M16, M20 and NGC 3603
(BLACKWELL PUBLISHING, 2006-05-01)
We present deep echelle spectrophotometry of the Galactic H-II regions M16, M20 and NGC 3603. The data have been taken with the Very Large Telescope Ultraviolet-Visual Echelle Spectrograph in the 3100-10400 angstrom range. ...
Orbits for eighteen visual binaries and two double-line spectroscopic binaries observed with hrcam on the CTIO SOAR 4m telescope, using a new bayesian orbit code based on markov chain Monte Carlo
(IOP Publishing Ltd., 2017)
We present orbital elements and mass sums for 18 visual binary stars of spectral types B to K (five of which are new orbits) with periods ranging from 20 to more than 500 yr. For two double-line spectroscopic binaries with ...
Identificación de parámetros de líneas de transmisión usando estimación de estado
(Universidad Nacional de Colombia - Facultad de Ingeniería, 2010)
Este artículo presenta dos algoritmos, basados en estimación de estado, para la identificación de parámetros de líneas de transmisión. Las técnicas utilizadas se fundamentan en la inclusión de los parámetros de las ...
Endogeneity in adaptive choice contexts: Choice-based recommender systems and adaptive stated preferences surveys
(Elsevier, 2020)
Endogeneity arises in discrete choice models due to several factors and results in inconsistent estimates of the model parameters. In adaptive choice contexts such as choice-based recommender systems and adaptive stated ...
Parameter identification of periodical signals: Application to measurement and analysis of ocean wave forces
(Digital Signal Processing: A Review Journal, 2018)
APEX Millimeter Observations of Methanol Emission Toward High-mass Star-forming Cores
(Institute of Physics Publishing, 2019)
© 2019. The American Astronomical Society. All rights reserved..We present 247 GHz molecular line observations of methanol (CH3OH) toward 16 massive star-forming regions using the APEX telescope with an angular resolution ...
Overidentification tests for the exogeneity of instruments in discrete choice models
(Elsevier Ltd, 2018)
Endogeneity is often present in discrete choice models, precluding the consistent estimation of the model parameters. To correct for this problem, the researcher needs to gather
exogenous instrumental variables, which ...
A VLT/MUSE galaxy survey towards QSO Q1410: Looking for aWHIM traced by BLAs in inter-cluster filaments
(Oxford University Press, 2018)
Cosmological simulations predict that a significant fraction of the low-z baryon budget resides in
large-scale filaments in the form of a diffuse plasma at temperatures T ∼ 105 −107 K. However, direct
observation of this ...