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Browsing Artykuły (WFAIS) by Title

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  • Piwiński, Mariusz; Piwiński, Mariusz (2014-02-19)
    Na przestrzeni ostatniej dekady mamy do czynienia z gwałtownym wzrostem wykorzystania komputerów we wszystkich sferach życia. Obecnie większość ludzi na świecie nie wyobraża sobie funkcjonowania bez komputera podłączonego ...
  • Hanasz, Michał (1997-11-23)
    The observed wiggles and knots in astrophysical jets as well as the curvilinear motion of radio emitting features are frequently interpreted as signatures of the Kelvin-Helmholtz (KH) instability (eg. Hardee 1987). We ...
  • Hanasz, Michał; Sol, Helene (1996-04-25)
    We investigate the Kelvin-Helmholtz instability of stratified jets. The internal component (core) is made of a relativistic gas moving with a relativistic bulk speed. The second component (sheath or envelope) flows between ...
  • Piwiński, Mariusz (Wydawnictwo Naukowe Uniwersytetu Mikołaja Kopernika, 2016)
    W ostatnich latach obserwowany jest bardzo dynamiczny rozwój technologii informatycznych oraz związanych z nimi różnych usług sieciowych. Obecnie mamy do czynienia ze zjawiskiem polegającym na podłączaniu do sieci coraz ...
  • Zawada, Karolina; Baek, Sunghye; Revaz, Yves; Vonlanthen, Patrick; Semelin, Benoît (Strasbourg, France 23-27 April 2012, )
    One of the possible sources of an anisotropy in the power spectrum of 21 cm brightness fluctuations from the epoch of reionization is the delay in light traveltime along the line-of-sight. We examine the anisotropy between ...
  • Zawada, Karolina; Semelin, Benoît; Vonlanthen, Patrick; Baek, Sunghye; Revaz, Yves (Oxford University Press, 2014-01)
    Using a suite of detailed numerical simulations we estimate the level of anisotropy generated by the time evolution along the light cone of the 21 cm signal from the epoch of reionization. Our simulations include the physics ...
  • Xie, Aozhen; Hettiarachchi, Chathuranga; Maddalena, Francesco; Witkowski, Marcin E.; Makowski, M.; Drozdowski, W.; Arramel; Wee, Andrew T.S.; Springham, Stuart V.; Vuong, Phan Q.; Kim, Hong J.; Dujardin, Christophe; Coquet, Philippe; Birowosuto, Muhammad D.; Dang, Cuong (Springer Nature, 2020-06-24)
    Two-dimensional lead halide perovskites have demonstrated their potential as high-performance scintillators for X- and gamma-ray detection, while also being low-cost. Here we adopt lithium chemical doping in two-dimensional ...
  • Duch, Włodzisław; Maszczyk, Tomasz (Springer, 2012)
    Support Vector Machines (SVM’s) with various kernels have become very successful in pattern classification and regression. However, single kernels do not lead to optimal data models. Replacing the input space by a ...
  • Strzałkowski, Karol; Streza, Mihaela; Pawlak, Michał (Elsevier, 2015)
    The aim of this paper is to compare the measurement accuracy of photopyroelectric calorimetry in back detection configuration (BPPE) and infrared lock-in thermography (LT) for thermal diffusivity measurement of solid ...
  • Olech, Mateusz; Szymczak, Marian; Wolak, Paweł; Gérard, Eric; Bartkiewicz, Anna (Astronomy & Astrophysics, 2020-02-01)
    Context: Periodic flares of maser emission are thought to be induced either by variations of the seed photon flux in young binary systems or the pump rate regulated by stellar and accretion luminosities. Aims: We seek to ...
  • Chruściński, Dariusz; Kossakowski, Andrzej; Pascazio, Saverio (2010-01-19)
    If the dynamics of an open quantum systems is non-Markovian, its {asymptotic} state strongly depends on the initial conditions, even if the dynamics possesses an {invariant} state. This is the very essence of memory effects. ...
  • Chruścińska, Alicja; Przegiętka, Krzysztof; Szroeder, Pawel; Oczkowski, Hubert Lucjan; Rozploch, Franciszek (Instytut Fizyki PAN, 2006)
    We found that beta-irradiated samples of crystallite graphite and multi--walled carbon nanotubes emit light during heating above room temperature. This behaviour is rather surprising for semimetals. Due to the lack of deep ...
  • Duch, Włodzisław; Jankowski, Norbert; Maszczyk, Tomasz (Institute of Electrical and Electronics Engineers, Computational Intelligence Society, 2012-06)
    Learning methods with linear computational complexity O(nd) in number of samples and their dimension often give results that are better or at least not worse that more sophisticated and slower algorithms. This is ...
  • Chruściński, Dariusz; Kossakowski, Andrzej (2012-01-28)
    We characterize a class of Markovian dynamics using the concept of divisible dynamical map. Moreover we provide a family of criteria which can distinguish Markovian and non-Markovian dynamics. These Markovianity criteria ...
  • Chruściński, Dariusz; Jurkowski, Jacek (2007-12-07)
    We analyze the new equation of motion for the damped oscillator. It differs from the standard one by a damping term which is nonlocal in time and hence it gives rise to a system with memory. Both classical and quantum ...
  • Duch, Włodzisław (Springer, 2011)
    Meta-learning methods are aimed at automatic discovery of interesting models of data. They belong to a branch of Machine Learning that tries to replace human experts involved in the Data Mining process of creating various ...
  • Bartkiewicz, Anna; Szymczak, Marian; van Langevelde, Huib Jan (EDP Sciences, 2012)
    Context. The 22.2 GHz water masers are often associated with the 6.7 GHz methanol masers but owing to the different excitation conditions they likely probe independent spatial and kinematic regions around the powering young ...
  • Szymczak, Marian; Olech, Mateusz; Sarniak, Rafał; Wolak, Paweł; Bartkiewicz, Anna (Oxford University Press, 2018-02)
    We report results of 6.7 GHz methanol maser monitoring of 139 star-forming sites with theTorun 32 m radio telescope from June 2009 to February 2013. The targets were observedat least once a month, with higher ...
  • Duch, Włodzisław (Nicolaus Copernicus University Press, 2013)
    Fenomika zajmuje się szczegółowym opisem wszystkich aspektów mierzalnych cech organizmu, od fizycznych cech na poziomie genetycznym, molekularnym komórkowym, do cech opisujących zdolności poznawcze. Fenomika europsychia ...
  • Chruściński, Dariusz; Kossakowski, Andrzej (2007-10-10)
    We construct a large class of multipartite qudit states which are positive under the family of partial transpositions. The construction is based on certain direct sum decomposition of the total Hilbert space displaying ...

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