Prohlížení Acta Polytechnica. 2012, vol. 52 dle názvu

Zobrazují se záznamy 68-87 z 100

    • New Abrasive Materials and Their Influence on the Surface Quality of Bearing Steel After Grinding 

      Autor: Jusko , Ondrej
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper focuses on the influence of various types of abrasive grains on cutting properties during the grinding process for bearing steel. In this experiment, not only conventional super-hard abrasive materials but also ...

    • On the Relation Between GRB Classes and Xray Flashes 

      Autor: Bagoly , Z.; Veres , P.; Horváth , I.; Mészáros , A.; Balázs , L. G.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Gamma-ray bursts are usually classified into either short-duration or long-duration bursts. Going beyond the short-long classification scheme, it has been shown on statistical grounds that a third, intermediate population ...

    • OOFEM — an Object-oriented Simulation Tool for Advanced Modeling of Materials and Structures 

      Autor: Patzák , Bořek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The aim of this paper is to describe the object-oriented design of the finite element based simulation code. The overall, object-oriented structure is described, and the role of the fundamental classes is discussed. The ...

    • Optimal Combustion Conditions for a Small-scale Biomass Boiler 

      Autor: Plaček , Viktor; Oswald , Cyril; Hrdlička , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper reports on an attempt to achieve maximum efficiency and lowest possible emissions for a small-scale biomass boiler. This aim can be attained only by changing the control algorithm of the boiler, and in this way ...

    • Optimization of Fuzzy Logic Controller for Supervisory Power System Stabilizers 

      Autor: Al-Turki , Y. A.; Attia , A.-F.; Soliman , H. F.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents a powerful supervisory power system stabilizer (PSS) using an adaptive fuzzy logic controller driven by an adaptive fuzzy set (AFS). The system under study consists of two synchronous generators, each ...

    • Overhead Line Mechanics Taking the Influence of Wind into Account 

      Autor: Müller , Miroslav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with problems of overhead line motion. The line model is based on a dynamic description of a catenary curve. The benefits of dynamic modeling in this field are decrypted, and there is an explanation of one ...

    • Physical and Chemical Aspects of the Nucleation of Cement-Based Materials 

      Autor: Demo , Pavel; Sveshnikov , Alexey; Hošková , Šárka; Ladman , David; Tichá , Petra
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      A theoretical model of the nucleation of portlandite is proposed, and the critical size of a portlandite cluster and the energy barrier of nucleation are determined. The steady state nucleation rate and the time lag of the ...

    • Plasma Flow and Temperature in a Gliding Reactor with Different Electrode Configurations 

      Autor: Sláma , J.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with the plasma flow shape depending on the electrode form of a gliding discharge plasma-chemical reactor, and with the temperature distribution along the direction of the plasma flow in one specific ...

    • Plasma Surface Treatment of Powder Materials — Process and Application 

      Autor: Pavlatová , Monika; Horáková , Marta; Hladík , Jan; Špatenka , Petr
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Polyolefin particles are hydrophobic, and this prevents their use for various applications. Plasma treatment is an environment-friendly polyolefin hydrophilisation method. We developed an industrial-scale plant for plasma ...

    • Prediction of Lower Extremity Movement by Cyclograms 

      Autor: Kutilek , P.; Viteckova , S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Human gait is nowadays undergoing extensive analysis. Predictions of leg movements can be used for orthosis and prosthesis programming, and also for rehabilitation. Our work focuses on predicting human gait with the use ...

    • Production of Biocellulosic Ethanol from Wheat Straw 

      Autor: Ismail ,; Ali , W.; Braim ,; Rasul , R.; Ketuly ,; Aziz , K.; Bujag , Awang; Shamsiah , D. Siti; Arifin ,; Zainudin ,
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Wheat straw is an abundant lignocellulosic feedstock in many parts of the world, and has been selected for producing ethanol in an economically feasible manner. It contains a mixture of sugars (hexoses and pentoses).Two-stage ...

    • Production of Biodiesel from Vegetable Oil Using Microware Irradiation 

      Autor: Kapilan , N.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The petroleum oil supply crisis, the increase in demand and the price eruption have led to a search for an alternative fuel of bio-origin in India. Among the alternative fuels, biodiesel is considered as a sustainable ...

    • Replacing Natural Gas by Biogas — Determining the Bacterial Contamination of Biogas by PCR 

      Autor: Čermáková , Jiřina; Mrázek , Jakub; Fliegerová , Kateřina; Tenkrát , Daniel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      A promising way of using biogas is to upgrade it to natural gas, which is referred to as Substitute Natural Gas (SNG) or biomethane. Biomethane, or biogas, is produced by biological processes of harnessing the ability of ...

    • Research and development of CO2 Capture and Storage Technologies in Fossil Fuel Power Plants 

      Autor: Pilař , Lukáš; Hrdlička , Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents the results of a research project on the suitability of post-combustion CCS technology in the Czech Republic. It describes the ammonia CO2 separation method and its advantages and disadvantages. The ...

    • Research Trends for PID Controllers 

      Autor: Visioli , Antonio
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper analyses the most significant issues that have been recently been addressed by researchers in the field of Proportional-Integral-Derivative (PID) controllers. In particular, the most recent techniques proposed ...

    • Resistance Spot Welding of dissimilar Steels 

      Autor: Kolařík , Ladislav; Sahul , Miroslav; Kolaříková , Marie; Sahul , Martin; Turňa , Milan; Felix , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents an analysis of the properties of resistance spot welds between low carbon steel and austenitic CrNi stainless steel. The thickness of the welded dissimilar materials was 2 mm. A DeltaSpot welding gun ...

    • 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 ...

    • 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 ...

    • Simulation of Free Airfoil Vibrations in Incompressible Viscous Flow — Comparison of FEM and FVM 

      Autor: Sváček , Petr; Horáček , Jaromír; Honzátko , Radek; Kozel , Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper deals with a numerical solution of the interaction of two-dimensional (2-D) incompressible viscous flow and a vibrating profile NACA 0012 with large amplitudes. The laminar flow is described by the Navier-Stokes ...

    • Strontium As a Structure Modifier for Non-binary Al–Si Alloy 

      Autor: Stunová , Barbora Bryksí
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents a study of the influence on the structure of AlSi10Mg alloy when 400 ppm of strontium is added. Not only changes in the morphology of eutectic silicon, but in particular changes in the morphology of the ...