Zobrazeno 1 - 10
of 57
pro vyhledávání: '"D. A. Homan"'
Publikováno v:
The Astronomical Journal, Vol 167, Iss 1, p 11 (2023)
We propose the use of entropy, measured from the spatial and flux distribution of pixels in the residual image, as a potential diagnostic and stopping metric for the CLEAN algorithm. Despite its broad success as the standard deconvolution approach in
Externí odkaz:
https://doaj.org/article/ca1f9aa2690b4e81bf37cbe9a1f1345e
Autor:
M. L. Lister, D. C. Homan, K. I. Kellermann, Y. Y. Kovalev, A. B. Pushkarev, E. Ros, T. Savolainen
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 1, p 34 (2023)
Externí odkaz:
https://doaj.org/article/726e55888ded4d489bdb827208001e2b
Autor:
D I Zobnina, H D Aller, M F Aller, D C Homan, Y Y Kovalev, M L Lister, I N Pashchenko, A B Pushkarev, T Savolainen
Publikováno v:
Monthly Notices of the Royal Astronomical Society.
Using stacking of images obtained at different epochs, we studied the variability properties of linear polarization of active galactic nucleus (AGN) jets on parsec-scales. Our sample is drawn from the MOJAVE programme, and consists of 436 AGNs manife
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ebf1f23227afdf0525b93f8d96b5fdb
https://doi.org/10.1093/mnras/stad1481
https://doi.org/10.1093/mnras/stad1481
Autor:
A B Pushkarev, H D Aller, M F Aller, D C Homan, Y Y Kovalev, M L Lister, I N Pashchenko, T Savolainen, D I Zobnina
We analysed the parsec-scale linear polarization properties of 436 active galactic nuclei (AGN) based on 15 GHz polarimetric Very Long Baseline Array (VLBA) observations. We present polarization and total intensity images averaged over at least five
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7050cf44c8c2172c79fca5fdde3dd754
https://aaltodoc.aalto.fi/handle/123456789/121476
https://aaltodoc.aalto.fi/handle/123456789/121476
Autor:
D. C. Homan, M. H. Cohen, T. Hovatta, K. I. Kellermann, Y. Y. Kovalev, M. L. Lister, A. V. Popkov, A. B. Pushkarev, E. Ros, T. Savolainen
We present multi-epoch, parsec-scale core brightness temperature observations of 447 AGN jets from the MOJAVE and 2cm Survey programs at 15 GHz from 1994 to 2019. The brightness temperature of each jet over time is characterized by its median value a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::90715a5b01f27a40cad6b35e526fa5e0
Autor:
A. A. Kovalyov, Ashot Petrosyan, D. A. Homan, V. V. Preobrazhenskii, N. V. Kondratyuk, A. S. Rudenkov, N. N. Rubtsova, Karine Hovhannesyan, Viktor Kisel, N. V. Kuleshov, A.S. Yasukevich
Publikováno v:
2020 International Conference Laser Optics (ICLO).
12W-picosecond SESAM mode-locked Yb:LuAP laser was developed. 2ps-laser pulses were obtained at the central wavelength around 999nm and optical-to-optical efficiency of 38% at 70MHz PRF. 4.8W of second harmonic radiation was obtained using 20mm LBO c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d923dc1303590bbdb219c5f83b82fb7
https://doi.org/10.1109/iclo48556.2020.9285428
https://doi.org/10.1109/iclo48556.2020.9285428
Autor:
M. L. Lister, D. C. Homan, K. I. Kellermann, Y. Y. Kovalev, A. B. Pushkarev, E. Ros, T. Savolainen
Publikováno v:
The Astrophysical Journal. 923:30
We have analyzed the parsec-scale jet kinematics of 447 bright radio-loud active active galactic nuclei (AGN), based on 15 GHz Very Long Baseline Array (VLBA) data obtained between 1994 August 31 and 2019 August 4. We present new total intensity and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ebe2b7ed45674c83cc41b10a09fdcf6
https://doi.org/10.3847/1538-4357/ac230f
https://doi.org/10.3847/1538-4357/ac230f
Autor:
J Witabora, D K Homan
Publikováno v:
IOP Conference Series: Earth and Environmental Science. 794:012108
Nudibranchs are a part of marine biota that have a very interesting visual appearance. There are over 3,000 species of nudibranchs that have been discovered. Their varied visual appearances, in both shapes and colours, have made nudibranchs very popu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::18dd905d864753b96eb2548e3c59f9ff
https://doi.org/10.1088/1755-1315/794/1/012108
https://doi.org/10.1088/1755-1315/794/1/012108
Autor:
J. Witabora, D. K. Homan
Publikováno v:
Journal of Physics: Conference Series. 1175:012247
Cinemagraph technique in the photography world brings up a new discourse in the presentation of a photograph as a visual communication media. Cinemagraph approach offers a new visual language that was never explored before. Even with a simple present
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::211a82287b6e0b590667020a7787fa4b
https://doi.org/10.1088/1742-6596/1175/1/012247
https://doi.org/10.1088/1742-6596/1175/1/012247
Autor:
J. D. H. Homan
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 63:181-188
The ratio k1/k2 of the alkaline saponification coefficients for the methyl and ethyl esters of the symmetrical aliphatic dicarboxylic acids, seems to be controled only by a statistical factor 2 and by the effect of the ionic centre in the mono-ester
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d9dbf073a1386f5752df1efecdb02bad
https://doi.org/10.1002/recl.19440630903
https://doi.org/10.1002/recl.19440630903