Acta Polytechnica. 2013, vol. 53, Supplement

 

Zobrazují se záznamy 41-60 z 68

    • THE SZ EFFECT IN THE PLANCK ERA: ASTROPHYSICAL AND COSMOLOGICAL IMPACT 

      Autor: Colafrancesco, Sergio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The Sunyaev–Zel’dovich effect (SZE) is a relevant probe for cosmology and particle astrophysics. The Planck Era marks a definite step forward in the use of this probe for astrophysics and cosmology. Astrophysical applications ...

    • RESULTS FROM THE XENON100 EXPERIMENT 

      Autor: Persiani, Rino
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The XENON program consists in operating and developing double-phase time projection chambers using liquid xenon as the target material. It aims to directly detect dark matter in the form of WIMPs via their elastic scattering ...

    • CP VIOLATIONS (AND MORE) AFTER THE FIRST TWO YEARS OF LHCB 

      Autor: Auriemma, Giulio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The most interesting cosmological open problems, baryon asymmetry, dark matter, inflation and dark energy, are not explained by the standard model of particle physics (SM). The finalgoal of the Large Hadron Collider an ...

    • SEARCH FOR DARK MATTER WITH GAMMA-RAYS: A REVIEW 

      Autor: Morselli, Aldo
      (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 ...

    • THE HISTORY OF THE S PROCESS AND ITS PRESENT STATE 

      Autor: Shaviv, Giora
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We review the history and the present status of the s-process and point to problems in need of clarification. In some cases it has to do with lack of experimental data and in other the theory is missing.

    • DETECTION OF A CHANGE OF SLOPE IN THE SPECTRUM OF HEAVY MASS COSMIC RAYS PRIMARIES BY THE KASCADE-GRANDE EXPERIMENT 

      Autor: Chiavassa, A.; Apel, W. D.; Arteaga-Velázquez, J. C.; Bekk, K.; Bertaina, M.; Blümer, J.; Bozdog, H.; Brancus, I. M.; Cantoni, E.; Cossavella, F.; Daumiller, K.; de Souza, V.; Di Pierro, F.; Doll, P.; Engel, R.; Engler, J.; Finger, M.; Fuchs, B.; Fuhrmann, D.; Garino, F.; Gils, H. J.; Glasstetter, R.; Grupen, C.; Haungs, A.; Heck, D.; Hörandel, J. R.; Huber, D.; Huege, T.; Kampert, K.-H.; Kang, D.; Klages, H. O.; Link, K.; Łuczak, P.; Ludwig, M.; Mathes, H. J.; Mayer, H. J.; Melissas, M.; Milke, J.; Mitrica, B.; Morello, C.; Oehlschläger, J.; Ostapchenko, S.; Palmieri, N.; Petcu, M.; Pierog, T.; Rebel, H.; Roth, M.; Schieler, H.; Schoo, S.; Schröder, F. G.; Sima, O.; Toma, G.; Trinchero, G. C.; Ulrich, H.; Weindl, A.; Wochele, J.; Wommer, M.; Zabierowski, J.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      KASCADE-Grande is an extensive air shower experiment devoted to the study of cosmic rays in the 1016 ÷ 1018 eV energy range. The array is composed by different detectors allowing independent measurements of the number of ...

    • MOONLIGHT: A NEW LUNAR LASER RANGING RETROREFLECTOR INSTRUMENT 

      Autor: Garattini, M.; Dell’Agnello, S.; Currie, D.; Delle Monache, G. O.; Tibuzzi, M.; Patrizi, G.; Berardi, S.; Boni, A.; Cantone, C.; Itaglietta, N.; Lops, C.; Maiello, M.; Martini, M.; Vittori, R.; Bianco, G.; March, R.; Bellettini, G.; Tauraso, R.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Since 1969 Lunar Laser Ranging (LLR) to the Apollo Cube Corner Reflector (CCR) arrays has supplied several significant tests of gravity: Geodetic Precession, the Strong and Weak Equivalence Principle (SEP, WEP), the ...

    • THE NA62 EXPERIMENT AT CERN AND THE MEASUREMENT OF THE ULTRA-RARE DECAY K⁺→π⁺ v ̄v 

      Autor: Antonelli, Antonella
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The NA62 experiment at CERN aims at the very challenging task of measuring with 10% relative error the Branching Ratio of the ultra-rare decay of the K+ into π+ ν¯ν which is expected to occur only in about 8 out of 1011 ...

    • A COMPUTER CLUSTER SYSTEM FOR PSEUDO-PARALLEL EXECUTION OF GEANT4 SERIAL APPLICATION 

      Autor: Federici, Memmo; Martino, Bruno L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Simulation of the interactions between particles and matter in studies for developing X-rays detectors generally requires very long calculation times (up to several days or weeks). These times are often a serious limitation ...

    • TeV GAMMA RAYS: OBSERVATIONS VERSUS EXPECTATIONS & THEORY 

      Autor: Krennrich, Frank
      (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 SENSITIVITY OF THE GREENHOUSE EFFECT TO CHANGES IN THE CONCENTRATION OF GASES IN PLANETARY ATMOSPHERES 

      Autor: Bressler, Smadar; Shaviv, Giora; Shaviv, Nir J.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We present a radiative transfer model for Earth-Like-Planets (ELP). The model allows the assessment of the effect of a change in the concentration of an atmospheric component, especially a greenhouse gas (GHG), on the ...

    • THE AUGER ENGINEERING RADIO ARRAY 

      Autor: Weidenhaupt, Klaus
      (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 ...

    • WHAT IS NEW IN ASTROPARTICLE PHYSICS 

      Autor: Giovannelli, Franco
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In this brief review paper I will point to the most important steps that have been made in recent decades toward a better understanding of the physics governing our Universe. Because of the limited length of this paper, I ...

    • STUDY OF THE TIME DEPENDENCE OF RADIOACTIVITY 

      Autor: Bellotti, E; Broggini, C.; Di Carlo, G.; Laubenstein, M.; Menegazzo, R.
      (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 ...

    • THE FIRST CENTURY OF COSMIC RAYS, AN HISTORICAL OVERVIEW 

      Autor: Jones, Lawrence W.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The 1912 balloon flights of Victor Hess and related activities in those years are reviewed. Subsequent research during the early 20th Century is noted, including the discovery of the positron, mesons, and air showers. The ...

    • HIGHLIGHTS FROM THE LHC 

      Autor: Straessner, Arno
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The Large Hadron Collider (LHC) and the two multi-purpose detectors, ATLAS and CMS, have been operated successfully at record centre-of-mass energies of 7 ÷ 8TeV. This paper presents the main physics results from proton–proton ...

    • THE DISCOVERY OF THE CHANDRASEKHAR MASS AND THE CHANDRASEKHAR-EDDINGTON CONTROVERSY 

      Autor: Shaviv, Giora
      (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. ...

    • OPERA HIGHLIGHTS 

      Autor: Strauss, Thomas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The OPERA experiment is a long baseline neutrino oscillation  experiment aimed at observing the νμ → ντ neutrino oscillation in the CERN neutrino to Gran Sasso beamline in the appearance mode by detecting the τ-decay. Here ...

    • OUR GALACTIC CENTER – THE NEAREST BURNING DISK 

      Autor: Kundt, Wolfgang
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      This short presentation will update my more than 25 years long attempts at understandingthe actions of the Central Engine at our Galactic Center.

    • EROSITA: AGN SCIENCE, BACKGROUND DETERMINATION, AND OPTICAL FOLLOW-UP SPECTROSCOPY 

      Autor: Boller, Thomas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      More than 20 years after the highly impacting ROSAT all-sky survey in the soft X-ray spectral range, we are close to the next major X-ray all/sky surveys with eROSITA. eROSITA will be the primary instrument on-board the ...