Prohlížení Acta Polytechnica. 2013, vol. 53 dle názvu

Zobrazují se záznamy 21-40 z 169

    • Complex Covariance 

      Autor: Kleefeld , Frieder
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      According to some generalized correspondence principle the classical limit of a non-Hermitian quantum theory describing quantum degrees of freedom is expected to be the well known classical mechanics of classical degrees ...

    • COMPUTATIONAL SCHEMES FOR THE PROPAGATION OF ULTRA HIGH ENERGY COSMIC RAYS 

      Autor: Aloisio, Roberto
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We discuss the problem of ultra high energy particles propagation in astrophysical backgrounds. We present two different computational schemes based on kinetic and Monte Carlo approaches. The kinetic approach is an analytical ...

    • Computer Simulation of a Plasma Vibrator Antenna 

      Autor: Bogachev , Nikolay N.; Bogdankevich , Irina L.; Gusein-zade , Namik G.; Tarakanov , Vladimir P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The use of new plasma technologies in antenna technology is widely discussed nowadays. The plasma antenna must receive and transmit signals in the frequency range of a transceiver. Many experiments have been carried out ...

    • CONSTRAINING SPACETIME TORSION WITH THE MOON, MERCURY AND LAGEOS 

      Autor: March, Riccardo; Bellettini, Giovanni; Tauraso, Roberto; Dell’Agnello, Simone
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We consider an extension of Einstein General Relativity where, beside the Riemann curvature tensor, we suppose the presence of a torsion tensor. Using a parametrized theory based on symmetry arguments, we report on some ...

    • Continued Fractions of Square Roots of Natural Numbers 

      Autor: Balková, Ĺubomíra; Hrušková, Aranka
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      In this paper, we will first summarize known results concerning continued fractions. Then we will limit our consideration to continued fractions of quadratic numbers. The second author describes periods and sometimes the ...

    • CONTROL OF THE DOUBLE INVERTED PENDULUM ON A CART USING THE NATURAL MOTION 

      Autor: Neusser , Zdenek; Valášek , Michael
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      This paper deals with controlling the swing-up motion of the double pendulum on a cart using a novel control. The system control is based on finding a feasible trajectory connecting the equilibrium positions from which the ...

    • COULOMB SCATTERING IN NON-COMMUTATIVE QUANTUM MECHANICS 

      Autor: Gáliková , Veronika; Prešnajder , Peter
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Recently we formulated the Coulomb problem in a rotationally invariant NC configuration space specified by NC coordinates xi, i = 1, 2, 3, satisfying commutation relations [xi, xj ] = 2iλεijkxk (λ being our NC parameter). ...

    • 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 ...

    • Czech Contribution to LOFT 

      Autor: Hudec , René; Petráček , Vojtěch; Šnita , Dalimil
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We describe the current status of the Czech contribution to the ESA LOFT space mission, with emphasis on technical aspects. Expertise available in the Czech Republic will play a positive role in the LOFT project and related ...

    • DAMA RESULTS: DARK MATTER IN THE GALACTIC HALO 

      Autor: Bernabei, R.; Belli, P.; Cappella, F.; Caracciolo, V.; Cerulli, R.; Dai, C. J.; d’Angelo, A.; Di Marco, A.; He, H. L.; Incicchitti, A.; Ma, X. H.; Montecchia, F.; Sheng, X. D.; Wang, R. G.; Ye, Z. P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Experimental efforts and theoretical developmens support that most of the Universe is Dark and a large fraction of it should be made of relic particles; many possibilities are open on their nature and interaction types. ...

    • DARK ENERGY AND KEY PHYSICAL PARAMETERS OF CLUSTERS OF GALAXIES 

      Autor: Bisnovatyi-Kogan, Gennady S.; Chernin, Artur; Merafina, Marco
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We study physics of clusters of galaxies embedded in the cosmic dark energy background. The equilibrium and stability of polytropic spheres with equation of state of the matter             P = Kpγ, γ = 1 + 1/n, in presence ...

    • 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 ...

    • Developing Control and Monitoring Software for the Data Acquisition System of the COMPASS Experiment at CERN 

      Autor: Bodlák , Martin; Jarý , Vladimír; Konorov , Igor; Mann , Alexander; Nový , Josef; Paul , Severine; Virius , Miroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      This paper focuses on the analysis, design and development of software for the new data acquisition system of the COMPASS experiment at CERN. In this system, the data flow is controlled by custom hardware; the software ...

    • Development of the PETAL Laser Facility and its Diagnostic Tools 

      Autor: Batani , Dimitri; Hulin , Sebastien; Ducret , Jean Eric; d’Humieres , Emmanuel; Tikhonchuk et al. , Vladimir
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The PETAL system (PETawatt Aquitaine Laser) is a high-energy short-pulse laser, currently in an advanced construction phase, to be combined with the French Mega-Joule Laser (LMJ). In a first operational phase (beginning ...

    • Diffuse Coplanar Surface Barrier Discharge in Nitrogen: Microdischarges Statistical Behavior 

      Autor: Cech , Jan; Hanusova , Jana; Stahel , Pavel; Slavicek , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We studied statistical behavior of microdischarges of diffuse coplanar surface barrier discharge (DCSBD) operated in nitrogen atmosphere at two input voltage regimes. We measured spectrally unresolved discharge patterns ...

    • DISC ATMOSPHERES AND WINDS IN X-RAY BINARIES 

      Autor: Díaz Trigo, Maria; Boirin, Laurence
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      We review the current status of studies of disc atmospheres and winds in low mass X-ray binaries. We discuss the possible wind launching mechanisms and compare the predictions of the models with the existent observations. ...

    • DO WE SEE THE ‘IRON PEAK’? 

      Autor: Erlykin, Anatoly D.; Wolfendale, Arnold W.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Recent measurements of the cosmic ray (CR) energy spectrum in the PeV region and above have confirmed the remarkable sharpness of the knee and revealed another structure at about 70PeV which we call the ‘Iron Peak’. The ...

    • EFFECT OF SLIP VELOCITY ON THE PERFORMANCE OF A SHORT BEARING LUBRICATED WITH A MAGNETIC FLUID 

      Autor: Patel U., Rachana; Deheri M., G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      This paper aims at analyzing the effect of velocity slip on the behavior of a magnetic fluid based infinitely short hydrodynamic slider bearing. Solving the Reynolds’ equation, the expression for pressure distribution is ...

    • Emittance Characterization of Ion Beams Provided by Laser Plasma 

      Autor: Velardi, Luciano; Side, Domenico Delle; Marco, Massimo De; Nassisi, Vincenzo
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Laser ion sources offer the possibility to obtain ion beams useful for particle accelerators. Nanosecond pulsed lasers at intensities of the order of 108 W/cm2, interacting with solid matter in a vacuum, produce plasma of ...

    • Emmy Noether and Linear Evolution Equations 

      Autor: Leach , P. G. L.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Noether’s Theorem relates the Action Integral of a Lagrangian with symmetries which leave it invariant and the first integrals consequent upon the variational principle and the existence of the symmetries. These each have ...