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    Wyświetlanie 1-7 z 7
    Tytuł:
    Black holes: do they exist?
    Autorzy:
    Malec, Edward
    Powiązania:
    https://bibliotekanauki.pl/articles/691080.pdf
    Data publikacji:
    2018
    Wydawca:
    Copernicus Center Press
    Tematy:
    history of physics
    history of black holes
    first observations of black holes
    present status of black holes
    black holes
    Opis:
    Black holes entered scientific literature as early as at the end of eighteenth century. They had been known at that time as dark stars, but their concept did not find its way to physics or astronomy, and had been abandoned for more than one hundred years. I shall sketch historical developments and discuss present mathematical and observational status of black holes.
    Źródło:
    Zagadnienia Filozoficzne w Nauce; 2018, 65
    0867-8286
    2451-0602
    Pojawia się w:
    Zagadnienia Filozoficzne w Nauce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Joint detection of gravitational waves from binary black hole and binary neutron star mergers by LIGO and Virgo
    Autorzy:
    Królak, Andrzej
    Patil, Mandar
    Powiązania:
    https://bibliotekanauki.pl/articles/690922.pdf
    Data publikacji:
    2018
    Wydawca:
    Copernicus Center Press
    Tematy:
    gravitational waves
    neutron stars
    black holes
    Opis:
    Advanced Virgo detector joined advanced LIGO twin detectors on 1st August 2017 in the quest to look for the gravitational waves. The global network of three detectors was operational for 25 days until the LIGO shut down on 25th August 2017. Two gravitational wave events were registered during this period. One of them was the binary black hole merger dubbed as GW170814 and other one is binary neutron star merger referred to as GW170817. Electromagnetic counterpart associated with binary neutron star merger was promptly identified which marks the beginning of multi-messenger astronomy. This article describes these events emphasizing on the crucial role played by the Virgo and focusing on some methodological issues.
    Źródło:
    Zagadnienia Filozoficzne w Nauce; 2018, 64; 95-115
    0867-8286
    2451-0602
    Pojawia się w:
    Zagadnienia Filozoficzne w Nauce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of temperature of black holes in terms of Chandrasekhar limit
    Autorzy:
    Mahto, D.
    Jha, B. K.
    Singh, K.M.
    Ram, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412044.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    black holes
    formula for the temperature
    Hawking
    Einstein
    Opis:
    Stephen Hawking gave the formula for the temperature for the black holes as[wzór] . In the present research article, we have converted this formula in terms of Chandrasekhar limit [Mch] and also calculated their values for different test black holes existing in XRBs and AGN. [wzór] Kelvin.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 40; 43-50
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some remarks on the first image of a black hole
    Autorzy:
    Szybka, Sebastian Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/690750.pdf
    Data publikacji:
    2020
    Wydawca:
    Copernicus Center Press
    Tematy:
    black holes
    event horizon
    general relativity
    interferometry
    astronomy
    Albert Einstein
    geometry
    Opis:
    On the 10th of April, 2019 the Event Horizon Telescope Collaboration presented the first image of the black hole. The image was obtained with a planet-scale array of eight ground-based radio telescopes. The observation relied on a technique called very long base interferometry which synchronises telescope facilities around the world. The image of a black hole together with the recent detections of gravitational waves confirms one of the most intriguing predictions of Einstein’s gravity theory, namely, the existence of black holes. I will provide more details on this remarkable observation and explore its consequences for our understanding of nature. The physical reality of black holes is strongly supported by recent advances of astronomy. I claim that this fact is the key to understanding the relation between our world and the world of mathematics.
    Źródło:
    Zagadnienia Filozoficzne w Nauce; 2020, 68; 281-294
    0867-8286
    2451-0602
    Pojawia się w:
    Zagadnienia Filozoficzne w Nauce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish contribution to space research
    Autorzy:
    Wolański, Piotr
    Banaszkiewicz, Marek
    Kłos, Zbigniew
    Ziółkowski, Janusz
    Zdziarski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/703286.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    space research
    Polish contribution
    rocket technology
    satellites
    X-ray sources
    black holes
    magnetars
    Opis:
    A short historical description of Polish contribution to astronomy and rocket technology is given. Then Polish activities in field of space exploration, such as instrument designed and build in Poland and placed on board of rockets, satellites and space probes during last 50 years are described. Contributions of the Space Research Center of the Polish Academy of Sciences as well as astronomical discoveries made by Polish astrophysicists are presented. Most important missions in which instruments build in Poland were placed on board are among others: Mars Express and Venus Express, Cassini-Huygens, Rosetta and Integral. Among numerous discoveries made by Polish astrophysicists, one should mention the discovery and proper identification of powerful burst from magnetar SGR 1806-20 and the discovery of unusually rapid bursts from black hole Cyg X-1.
    Źródło:
    Nauka; 2008, 3
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetically modified organisms – economy and safety
    Autorzy:
    Bąkowska-Żywicka, Kamila
    Tyczewska, Agata
    Twardowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/703288.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    space research
    Polish contribution
    rocket technology
    satellites
    X-ray sources
    black holes
    magnetars
    Opis:
    A short historical description of Polish contribution to astronomy and rocket technology is given. Then Polish activities in field of space exploration, such as instrument designed and build in Poland and placed on board of rockets, satellites and space probes during last 50 years are described. Contributions of the Space Research Center of the Polish Academy of Sciences as well as astronomical discoveries made by Polish astrophysicists are presented. Most important missions in which instruments build in Poland were placed on board are among others: Mars Express and Venus Express, Cassini-Huygens, Rosetta and Integral. Among numerous discoveries made by Polish astrophysicists, one should mention the discovery and proper identification of powerful burst from magnetar SGR 1806-20 and the discovery of unusually rapid bursts from black hole Cyg X-1.
    Źródło:
    Nauka; 2008, 3
    1231-8515
    Pojawia się w:
    Nauka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Rotating Black Holes
    Autorzy:
    Vindana, W. M. H. P.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1158501.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Hawking radiation
    Hawking temperature
    Kerr black hole
    Kerr-Newman black hole
    entropy
    mass variation
    rotating black holes
    thermodynamic parameters
    Opis:
    Considering the analogy between classical thermodynamic parameters and black hole parameters, the four laws of thermodynamics are reinterpreted for Kerr and Kerr-Newman black holes. A simple model for the dynamic relationships was obtained by considering the surface area of the outer horizon of a Kerr and Kerr-Neumann black hole as the area of a perfect black body. Finding the conditions these black holes should satisfy, the equations were numerically solved and simulated for the Hawking temperature, Hawking radiation and entropy variations of Kerr and Kerr-Newman black holes. The Hawking temperature and Hawking radiation of a given rotating black hole drastically increases at the final stage of the black hole evaporation. In the meantime, the entropy of a rotating black hole drastically decreases through the time. The additional angular momentum and the charge effects gain high Hawking temperatures and high Hawking radiation values for the black holes while these effects reduce the entropy of the black holes.
    Źródło:
    World Scientific News; 2018, 114; 106-125
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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