Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 685-704 z 880

    • S5 1803+78 Revisited 

      Autor: Nesci , R.; Maselli , A.; Montagni , F.; Sclavi , S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source showed no clear periodicity, but a time scale of about 1 300 days between major flares is possibly present. No systematic ...

    • 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 ...

    • SEARCH FOR GRAVITATIONAL WAVES FROM SUPERNOVAE AND LONG GRBS 

      Autor: van Putten, Maurice H.P.M.
      (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 ...

    • SEARCH FOR ISOLATED BLACK HOLES: PAST, PRESENT, FUTURE 

      Autor: Karpov , Sergey; Beskin , Grigory; Plokhotnichenko , Vladimir
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The critical property of a black hole is the presence of an event horizon. It may be detected only by means of a detailed study of the emission features of its surroundings. The temporal resolution of such observations has ...

    • SEGMENTING TAGGED CARDIAC MRI DATA USING A LOCAL VARIANCE FILTER 

      Autor: Oberhuber , Tomáš; Kučera , Slavomír; Loucký , Jakub; Súkupová , Lucie; Tintěra , Jaroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      We present a new method for segmenting tagged MRI data. It is based on the observation that the tagging grid vanishes almost immediately inside the ventricles because of the blood flow. Segmentation can be therefore driven ...

    • Self tunning filter for three levels four legs shunt active power filter with fuzzy logic controller 

      Autor: Djendaoui, Dahmane; Benaissa, Amar; Rabhi, Boualaga; Zellouma, Laid
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The low harmonic distortion and reduced switching losses are the advantages of using the multilevel inverter. For this purpose, the three-level inverter is used in this paper as a three-phase four-leg shunt active power ...

    • Self-interference cancellation in underwater acoustic communications systems using orthogonal pilots in IBFD 

      Autor: Naman, Hala A.; Abdelkareem, Ammar E.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      This paper proposes a Self-interference (SI) cancellation system model of Underwater acoustic (UWA) communication for in-band full-duplex (IBFD) technology. The SI channel is separated from the Far channel by exploiting a ...

    • Semi-analytical approach-based studies of the squeeze film lubrication between rough porous annular discs: Rabinowitsch fluid model 

      Autor: Rahul, Amit Kumar; Singh, Manoj Kumar; Tiwari, Ravi; Paul, Sourabh; Rao, Pentyala Srinivasa; Biswas, Rohahn
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      In recent years, there has been much interest in the effects of porosity and surface roughness (SR) or geometric irregularities between two moving plates under hydrodynamic lubrication. Porous bearings are used extensively ...

    • SEMICLASSICAL ASYMPTOTICS OF EIGENVALUES FOR NON-SELFADJOINT OPERATORS AND QUANTIZATION CONDITIONS ON RIEMANN SURFACES 

      Autor: Esina I., Anna; Shafarevich I., Andrei
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      This paper reports a study of the semiclassical asymptotic behavior of the eigenvalues of some nonself-adjoint operators that are important for applications. These operators are the Schrödinger operator with complex periodic ...

    • SENSITIVITY ANALYSIS OF INPUT PARAMETERS FOR LOAD CARRYING CAPACITY OF MASONRY ARCH BRIDGES 

      Autor: Vokál , Marek; Drahorád , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The article deals with an analysis of railway masonry arch bridges. Typical attributes of these bridges are pointing loss and backfill. Therefore, the material - masonry - behaviour can be described only by a non-linear ...

    • SHAPE OF A NUCLEUS GROWING ON STRONGLY CURVED SURFACE OF A NANOFIBER 

      Autor: Sveshnikov , Alexey; Demo , Pavel; Kožíšek , Zdeněk; Tichá , Petra
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The equilibrium shape of a critical nucleus has strong impact on important parameters of nucleation theory, such as nucleation rate. While on the flat substrate the growing nucleus has a shape of a spherical cap, a shape ...

    • Shock wave configuration in a transonic flow through a mid-section of a last stage turbine blade cascade equipped with a part-span connector 

      Autor: Radnic, Tomáš; Šafařík, Pavel; Luxa, Martin; Šimurda, David
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      This paper deals with the study of a flow field and namely the configuration of shock waves in a blade cascade equipped with a part-span connector called tie-boss. The cascade consists of prismatic blades formed from the ...

    • SHRINKAGE OF VARIOUS TYPES OF PORTLAND CLINKER-BASED CEMENTS WITH RESPECT TO THEIR HYDRATION DEGREE 

      Autor: Davidová , Vendula; Reiterman , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The volume changes of cement based composites are significantly exhibited in the hardening process. Initial phases of the hardening are complemented by the expansion due to the heat evolution that is subsequently alternated ...

    • SILOXANES REMOVAL FROM BIOGAS USING ACTIVATED CARBON 

      Autor: Vagenknechtová , Alice; Ciahotný , Karel; Vrbová , Veronika
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      SiO2 deposits which cause technical problems on combustion equipment are built by combustion of biogas containing siloxanes. Therefore, in these cases, the siloxanes must be removed from the biogas. For siloxane removal ...

    • SIMILARITY SOLUTIONS AND CONSERVATION LAWS FOR THE BEAM EQUATIONS: A COMPLETE STUDY 

      Autor: Halder , Amlan Kanti; Paliathanasis , Andronikos; Leach , Peter Gavin Lawrence
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      We study the similarity solutions and we determine the conservation laws of various forms of beam equations, such as Euler-Bernoulli, Rayleigh and Timoshenko-Prescott. The travelling-wave reduction leads to solvable ...

    • SIMPLE MODELS OF THREE COUPLED PT -SYMMETRIC WAVE GUIDES ALLOWING FOR THIRD-ORDER EXCEPTIONAL POINTS 

      Autor: Schnabel , Jan; Cartarius , Holger; Main , Jörg; Wunner , Günter; Heiss , Walter Dieter
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      We study theoretical models of three coupled wave guides with a PT-symmetric distribution of gain and loss. A realistic matrix model is developed in terms of a three-mode expansion. By comparing with a previously postulated ...

    • SIMULATION ANALYSIS OF PREHEATER CHARGE TO THE ROTARY FURNACE 

      Autor: Mikula , Jan; Palička , Pavol; Kerekanic , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      Mathematical modeling of heat aggregates is one of the fundamental methods of the mathematical modelling research. A mathematical model based on the method of elementary balances was created for the thermal treatment of ...

    • SIMULATION MODEL BASED ON REGIONAL DEVELOPMENT AND VIRTUAL CHANGES 

      Autor: Dlask , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      This paper reports on change as an indicator that can be provide more focused goals in studies of development. The paper offers an answer to the question: How might management gain information from a simulation model and ...

    • SIMULATION OF A MANEUVERING AIRCRAFT USING A PANEL METHOD 

      Autor: Schoř, Pavel; Kouřil, Martin; Daněk, Vladimír
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      We present a method for numerical simulations of a maneuvering aircraft, which uses a first-order unsteady panel method as the only source of aerodynamic forces and moments. By using the proposed method, it is possible to ...

    • Simulation of a Matrix Converter Fed Drive With Sliding Mode Control 

      Autor: Bauer , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Induction machines are among the most widely used electrical-to-mechanical converters in electric drives. Their advantageous robustness and simplicity goes hand-in-hand with complicated control. A converter with a suitable ...