Results 21 to 30 of about 300,638 (255)
HIGH-PRECISION MICROWAVE SPECTROMETER WITH SUB-DOPPLER SPECTRAL RESOLUTION
Radio Physics and Radio Astronomy, 2014 Results of improvement of the automated millimeter-wave spectrometer of the Institute of Radio Astronomy NAS–Ukraine aimed at reaching a sub-Doppler resolution on the basis of the Lamb-dip observation are presented.
E. A. Alekseev +2 more
doaj +1 more source
A new near-IR window of low extinction in the Galactic plane [PDF]
, 2018 Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO. Comments: 6 pages, 6 figures. Accepted for publication in Astronomy & AstrophysicsAims.
Alonso-García, Javier +10 more
core +5 more sources
New species in the Old World: Europe as a frontier in biodiversity exploration, a test bed for 21st century taxonomy. [PDF]
PLoS ONE, 2012 The number of described species on the planet is about 1.9 million, with ca. 17,000 new species described annually, mostly from the tropics. However, taxonomy is usually described as a science in crisis, lacking manpower and funding, a politically ...
Benoît Fontaine +50 more
doaj +1 more source
Bessel’s method in study of solar eclipse influence on the ionosphere
Вісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електроніка, 2023 Relevance. A solar eclipse is a global disturbing factor that significantly changes the characteristics of the ionosphere. As is known, the ionosphere affects the propagation of radio waves of all ranges, that is, it affects the operation of navigation ...
Yu. B. Mylovanov, V. L. Dorokhov
doaj +1 more source
Synergies between exoplanet surveys and variable star research
EPJ Web of Conferences, 2017 With the discovery of the first transiting extrasolar planetary system back in 1999, a great number of projects started to hunt for other similar systems. Because the incidence rate of such systems was unknown and the length of the shallow transit events
Kovacs Geza
doaj +1 more source
Annales Geophysicae, 1999 Two aspects of solar MHD are discussed in relation to the work of the MHD simulation group at KIS. Photospheric magneto-convection, the nonlinear interaction of magnetic field and convection in a strongly stratified, radiating fluid, is a key process ...
M. Schüssler, M. Schüssler
doaj +1 more source
Induced two-photon decay of the 2s level and the rate of cosmological hydrogen recombination [PDF]
, 2005 Induced emission due to the presence of soft CMB photons slightly increases the two-photon decay rate of the 2s level of hydrogen defining the rate of cosmological recombination.
Bennett +19 more
core +3 more sources
Primary gamma ray selection in a hybrid timing/imaging Cherenkov array
EPJ Web of Conferences, 2017 This work is a methodical study on hybrid reconstruction techniques for hybrid imaging/timing Cherenkov observations. This type of hybrid array is to be realized at the gamma-observatory TAIGA intended for very high energy gamma-ray astronomy (> 30 TeV).
Postnikov E.B. +3 more
doaj +2 more sources
EXERCÍCIOS ENVOLVENDO A MAGNITUDE LIMITE NO ENSINO DE ASTRONOMIA
Ensaio Pesquisa em Educação em CiênciasNeste trabalho são apresentados alguns exercícios e atividades, elaborados para disciplinas de Astronomia Básica e inspirados na propos ta de exploração multicontextual de Ausubel, relacionando o conceito de magnitude limite ao poder de captação de luz ...
Lev Vertchenko +1 more
doaj +1 more source
Precisely determining photon-number in real time [PDF]
QuantumSuperconducting transition-edge sensors (TES) are extremely sensitive microcalorimeters used as photon detectors with unparalleled energy resolution.
Leonardo Assis Morais +9 more
doaj +1 more source