Prohlížení Acta Polytechnica. 2013, vol. 53 dle názvu
Zobrazují se záznamy 118-137 z 169
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SEARCH FOR DARK MATTER WITH GAMMA-RAYS: A REVIEW
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)Successfully launched in June 2008, the Fermi Gamma-ray Space Telescope, formerly named GLAST, has been observing the high-energy gamma-ray sky with unprecedented sensitivity inthe 20MeV ÷ 300 GeV energy range and electrons ... -
SEARCH FOR GRAVITATIONAL WAVES FROM SUPERNOVAE AND LONG GRBS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We report on evidence for black hole spindown in the light curves of the BATSE catalogue of 1491 long GRBs by application of matched filtering. This observation points to a strong interaction of the black hole with surrounding ... -
Spectral Analysis of Schrödinger Operators with Unusual Semiclassical Behavior
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)In this paper we discuss several examples of Schrödinger operators describing a particle confined to a region with thin cusp-shaped ‘channels’, given either by a potential or by a Dirichlet boundary; we focus on cases when ... -
Spectral Singularities do not Correspond to Bound States in the Continuum
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We show that, contrary to a claim made in arXiv:1011.0645, the von Neumann-Winger bound states that lie in the continuum of the scattering states are fundamentally different from Naimark’s spectral singularities. -
Stationary and Dynamical Solutions of the Gross-Pitaevskii Equation for a Bose-Einstein Condensate in a PT symmetric Double Well
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We investigate the Gross-Pitaevskii equation for a Bose-Einstein condensate in a PT symmetric double-well potential by means of the time-dependent variational principle and numerically exact solutions. A one-dimensional ... -
Status and Perspectives of the Mini-MegaTORTORA Wide-field Monitoring System with High Temporal Resolution
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)Here we briefly summarize our long-term experience of constructing and operating wide-field monitoring cameras with sub-second temporal resolution to look for optical components of GRBs, fast-moving satellites and meteors. ... -
STATUS OF THE CUORE EXPERIMENT
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The CUORE (Cryogenic Underground Observatory for Rare Events) experiment will search for neutrinoless double beta decay of 130Te, a rare nuclear process that, if observed, would demonstrate the Majorana nature of the ... -
Steel Fibre Reinforced Concrete for Tunnel Lining – Verification by Extensive Laboratory Testing and Numerical Modelling
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The use of precast steel fibre reinforced concrete (SFRC) for tunnel segments is a relatively new application of this material. It was first applied in Italy in the 1980s. However, it did not begin to be widely applied ... -
Stimulated Raman Backscattering in Plasma — a Promising Tool for the Generation of Ultra-High Power Laser Beams
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)In the last fifteen years stimulated Raman backscattering (SRBS) in plasma has been intensively elaborated as a promising tool on the way towards high intense lasers. There are several advantages of this technique in ... -
Study of Silicon Photomultipliers for the GRIPS Calorimeter Module
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)GRIPS is a proposed gamma-ray (200 keV to 80 MeV) astronomy mission, which incorporates a pair-creation and Compton scattering telescope, along with X-ray and infrared telescopes. It will carry out a sensitive all-sky ... -
STUDY OF THE TIME DEPENDENCE OF RADIOACTIVITY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The activity of a 137Cs source was measured using a germanium detector installed deep underground in the Gran Sasso Laboratory. In total about 5100 energy spectra, one hour measuring time each, were collected and used to ... -
SUPERNOVA 1987A: CELEBRATING A SILVER JUBILEE
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The story of the SN 1987A explosion is briefly reviewed. Although this supernova was somewhat peculiar, the study of SN 1987A has clarified quite a number of important aspects of the nature and the properties of supernovae, ... -
Systems of Electronic Overcurrent Protection in Pulse Power Generator Operating on Plasma Load
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)Schematic peculiarities of pulsed power source and modulator-shaper for working on high instability plasma load are discussed. In its construction should be provided for several levels of overcurrent protection. First of ... -
TeV GAMMA RAYS: OBSERVATIONS VERSUS EXPECTATIONS & THEORY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The scope of this paper is to discuss two important questions relevant for TeV γ-ray astronomy; the pursuit to reveal the origin of cosmic rays in our galaxy, and the opacity of the universe in γ-rays. The origin of cosmic ... -
THE 2H(α, γ)6LI REACTION AT LUNA AND BIG BANG NUCLEOSYNTHETIS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The 2H(α, γ)6Li reaction is the leading process for the production of 6Li in standard Big Bang Nucleosynthesis. Recent observations of lithium abundance in metal-poor halo stars suggest that there might be a 6Li plateau, ... -
THE ASTRO-H MISSION
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)A review of the Astro-H mission is presented here on behalf of the Astro-H collaboration. The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by the Institute of Space ... -
THE AUGER ENGINEERING RADIO ARRAY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The Auger Engineering Radio Array currently measures MHz radio emission from extensive air showers induced by high energy cosmic rays with 24 self-triggered radio detector stations. Its unique site, embedded into the ... -
The Construction of the Fast Resistive Bolometer for a SXR Measurement on the GIT-12 Facility
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)A lot of kinds of instruments are used for the SXR measurement at pulsed power facilities, but most of them are difficult to calibrate absolutely. For the determination of the energy of SXR radiated by the discharge on ... -
The Czech Contribution to Future Large X-Ray Astronomy Telescopes: Recent Progress
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)We briefly review the recent status of the Czech contribution to future space X-ray astronomy missions with emphasis on the development of new technologies and test samples of X-ray mirrors with precise surfaces based on ... -
THE DISCOVERY OF THE CHANDRASEKHAR MASS AND THE CHANDRASEKHAR-EDDINGTON CONTROVERSY
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)The so called Chandrasekhar limiting mass is a a quantum mechanical relativistic effect. The discovery and establishment of the concept involved a major controversy between the young Chandrasekhar and the hilarious Eddington. ...