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First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,Asada, Keiichi,Azulay, Rebecca,Baczko, Anne-Kathrin,Ball, David,Baloković,, Mislav,Barrett, John,Bintley, Dan,Blackburn, Lindy,Boland, Wilfred,Bouma American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.875 No.1
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,Asada, Keiichi,Azulay, Rebecca,Baczko, Anne-Kathrin,Ball, David,Baloković,, Mislav,Barrett, John,Bintley, Dan,Blackburn, Lindy,Boland, Wilfred,Bouma American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.875 No.1
First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,Asada, Keiichi,Azulay, Rebecca,Baczko, Anne-Kathrin,Ball, David,Baloković,, Mislav,Barrett, John,Bintley, Dan,Blackburn, Lindy,Boland, Wilfred,Bouma American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.875 No.1
First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,Asada, Keiichi,Azulay, Rebecca,Baczko, Anne-Kathrin,Ball, David,Baloković,, Mislav,Barrett, John,Bintley, Dan,Blackburn, Lindy,Boland, Wilfred,Bouma American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.875 No.1
Edson Cabral da Silva,Takashi Muraoka,Alefe Viana Souza Bastos,Vinícius Ide Franzini,Salatiér Buzetti,Frederico Antonio Loureiro Soares,Marconi Batista Teixeira,José Alberto Bendassolli 한국작물학회 2020 Journal of crop science and biotechnology Vol.23 No.3
Erratum to: J. Crop Sci. Biotech. 2020 (March) 23 (2):117–126 https ://doi.org/10.1007/s1289 2-019-0288-0
Edson Cabral da Silva,Takashi Muraoka,Alefe Viana Souza Bastos,Vinícius Ide Franzin,Salatiér Buzetti,Frederico Antonio Loureiro Soares,Marconi Batista Teixeira,José Alberto Bendassolli 한국작물학회 2020 Journal of crop science and biotechnology Vol.23 No.2
Cover plants are intended to cover the soil, protecting it from erosion, nutrient leaching, and providing nutrients through recycling or biological fixation. The objectives of this study were to evaluate the dry biomass productivity and total accumulation of nutrients in the cover crops shoots and in the upland rice grown in succession; and evaluate the effect of the isolated and combined use of cover crops and urea on upland rice crop, grown under no-tillage system. The field experiment was conducted at Selvíria-MS, Brazil, in an Oxisol (Rhodic Haplustox), cerrado (savannah) phase. The experimental design was randomized blocks, in a 5x3 factorial scheme. The treatments were four cover crops species: sunn hemp (Crotalaria juncea L.), pigeon pea (Cajanus cajan L.), green velvet bean (Mucuna prurens), millet (Pennisetum glaucum L.), and spontaneous vegetation (fallow in off-season) combined with 20 kg N ha-1 applied at sowing, 20 kg N ha-1 applied at sowing + 60 kg N ha-1 at plus topdressing, and without mineral N fertilizer application. The millet recycled large amounts of K, Mg, S, and micronutrients, but negatively influenced the rice grain yield grown in succession. There was no response to topdressed mineral N fertilizer when the crop was grown in rotation to legume cover crops. Upland rice under no-tillage showed a positive response to the N fertilization at seeding and when it is grown in rotation with the use of millet or fallow in the off-season. Upland rice also showed a response to N fertilization applied at topdressing.
First 230 GHz VLBI fringes on 3C 279 using the APEX Telescope
Wagner, J.,Roy, A. L.,Krichbaum, T. P.,Alef, W.,Bansod, A.,Bertarini, A.,Gü,sten, R.,Graham, D.,Hodgson, J.,Mä,rtens, R.,Menten, K.,Muders, D.,Rottmann, H.,Tuccari, G.,Weiss, A.,Wieching, G.,W EDP Sciences 2015 Astronomy and astrophysics Vol.581 No.-
PERSISTENT ASYMMETRIC STRUCTURE OF SAGITTARIUS A* ON EVENT HORIZON SCALES
Fish, Vincent L.,Johnson, Michael D.,Doeleman, Sheperd S.,Broderick, Avery E.,Psaltis, Dimitrios,Lu, Ru-Sen,Akiyama, Kazunori,Alef, Walter,Algaba, Juan Carlos,Asada, Keiichi,Beaudoin, Christopher,Bert American Astronomical Society 2016 The Astrophysical journal Vol.820 No.2
<P>The Galactic Center black hole Sagittarius. A* (Sgr A*) is a prime observing target for the Event Horizon Telescope (EHT), which can resolve the 1.3 mm emission from this source on angular scales comparable to that of the general relativistic shadow. Previous EHT observations have used visibility amplitudes to infer the morphology of the millimeter-wavelength emission. Potentially much richer source information is contained in the phases. We report on 1.3 mm phase information on Sgr. A* obtained with the EHT on a total of 13 observing nights over four years. Closure phases, which are the sum of visibility phases along a closed triangle of interferometer baselines, are used because they are robust against phase corruptions introduced by instrumentation and the rapidly variable atmosphere. The median closure phase on a triangle including telescopes in California, Hawaii, and Arizona is nonzero. This result conclusively demonstrates that the millimeter emission is asymmetric on scales of a few Schwarzschild radii and can be used to break 180 degrees rotational ambiguities inherent from amplitude data alone. The stability of the sign of the closure phase over most observing nights indicates persistent asymmetry in the image of Sgr. A* that is not obscured by refraction due to interstellar electrons along the line of sight.</P>