Zobrazeno 1 - 10 of 39 pro vyhledávání: '"G. van Urk"'
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Akademický článek
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Insects and insecticides in the Lower Rhine
Autor: F. Kerkum, G. Van Urk, C.J. Van Leeuwen
Publikováno v: Water Research. 27:205-213
Two chemical accidents with insecticides in the River Rhine, i.e. the endosulfan accident in 1969 and the Sandoz accident in 1986, played an important role in public and political awareness regarding water pollution. The endosulfan accident gave caus
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::daf4422363412ada6e38b9d581ba189c
https://doi.org/10.1016/0043-1354(93)90077-u
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3
TeV observations of gamma-ray pulsar: A test for pulsar models
Autor: H. I. Nel, Barend Visser, B. C. Raubenheimer, G. van Urk, A. R. North, C. Brink, L. J. Haasbroek, P. J. Meintjes, O. C. de Jager
Publikováno v: AIP Conference Proceedings.
We present the first results of TeV γ‐ray observations of PSR1706−44, indicating a sharp spectral break between ∼10 GeV and 1000 GeV. Our and other results confirm similar breaks from other γ‐ray pulsars such as Vela, PSR1509−58 and Gemin
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c3f4be7133582fee02fd5b1e7792454f
https://doi.org/10.1063/1.44129
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4
Near simultaneous optical and TeV observations of AE Aquarii
Autor: C. Brink, G. van Urk, H. I. Nel, O. C. de Jager, P. J. Meintjes, A. R. North, Barend Visser, B. C. Raubenheimer, David A. H. Buckley
Publikováno v: Lecture Notes in Physics ISBN: 9783540547891
We present results of near simultaneous optical and TeV observations made on Sept. 14, 1990 of the novalike cataclysmic variable AE Aquarii. The optical was in a flaring state resulting in a bolometric luminosity which may have been high enough to gi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5a4d5a09c38527eb06cf9baa4b64e5ce
https://doi.org/10.1007/3-540-54789-4_69
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5
TeV gamma-rays from accreting binary systems
Autor: B. C. Raubenheimer, D. O'Donoghue, P. J. Meintjes, A. R. North, O. C. de Jager, H. I. Nel, C. Brink, G. van Urk, Barend Visser
Publikováno v: AIP Conference Proceedings.
Evidence is presented that Vela X‐1 emits steady pulsed emission at the X‐ray period. Another X‐ray binary, Cen X‐3, also show evidence for steady, pulsed emission at the expected X‐ray period, but this emission only occurs in the orbital p
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2b9f7966db86e8dcea87bb5dbf62e4fb
https://doi.org/10.1063/1.40325
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10
AE Aquarii - an emitter of pulsed TeV gamma rays resembling optical emission during flares
Autor: A. R. North, P. J. Meintjes, C. Brink, B. C. Raubenheimer, H. I. Nel, O. C. de Jager, G. van Urk, Barend Visser
Publikováno v: The Astrophysical Journal. 401:325
During optical flares, strong coherent pulsed emission is detected in the frequency interval ∼29.9-30.0 mHz and at F 0 =30.23 mHz (rotation frequency). Evidence is presented of pulsed VHE emission at these frequencies in all our VHE data at the 99.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3108e904931b11b5f72fd2686adae001
https://doi.org/10.1086/172063
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