Prohlížení Acta Polytechnica. 2019, vol. 59 dle názvu

Zobrazují se záznamy 11-30 z 60

    • APPLICABILITY VERIFICATION OF AUTOFORM SOFTWARE FOR FEM SIMULATION OF MECHANICAL FIXATION OF HEMMED JOINTS 

      Autor: Chrášťanský , Lukáš; Šanovec , Jan; Martawirya , Yatna Yuwana; Valeš , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This paper deals with the problematics of fixation of hemmed joints, especially with one specific mechanical method how to ensure a dimensional stability of a hemmed joint of car-body parts, such as doors, bonnet and trunk ...

    • AUTOMATIC EEG CLASSIFICATION USING DENSITY BASED ALGORITHMS DBSCAN AND DENCLUE 

      Autor: Piorecký , Marek; Štrobl , Jan; Krajča , Vladimír
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Electroencephalograph (EEG) is a commonly used method in neurological practice. Automatic classifiers (algorithms) highlight signal sections with interesting activity and assist an expert with record scoring. Algorithm ...

    • AUTOMATIC RECONSTRUCTION OF ROOF MODELS FROM BUILDING OUTLINES AND AERIAL IMAGE DATA 

      Autor: Hron , Vojtěch; Halounová , Lena
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The knowledge of roof shapes is essential for the creation of 3D building models. Many experts and researchers use 3D building models for specialized tasks, such as creating noise maps, estimating the solar potential of ...

    • COMMON CROSSING CONDITION MONITORING WITH ON BOARD INERTIAL MEASUREMENTS 

      Autor: Sysyn, Mykola; Nabochenko, Olga; Gerber, Ulf; Kovalchuk, Vitalii; Petrenko, Oleksiy
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      A railway turnout is an element of the railway infrastructure that influences the reliability of a railway traffic operation the most. The growing necessity for the reliability and availability in the railway transportation ...

    • COMPARATIVE STUDY AND EMPIRICAL MODELLING OF PULVERIZED COCONUT SHELL, PERIWINKLE SHELL AND PALM KERNEL SHELL AS A POZZOLANS IN CONCRETE 

      Autor: Ikponmwosa , Efe Ewaen; Ehikhuenmen , Samuel Onosedeba; Irene , Karieren Kate
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Infrastructural development across the world is fast growing due to the rapid growth in population. This has resulted in consequently creating an increase in the demand for construction materials, especially cement. This ...

    • COMPARISON OF ENERGY FLOW STREAM AND ISENTROPIC METHOD FOR STEAM TURBINE ENERGY ANALYSIS 

      Autor: Blažević , Sebastijan; Mrzljak , Vedran; Anđelić , Nikola; Car , Zlatan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      In this paper, a comparison of two different methods for a steam turbine energy analysis is presented. A high-pressure steam turbine from a supercritical thermal power plant (HPT) was analysed at three different turbine ...

    • COMPENSATION OF SPRINGBACK IN LARGE SHEET METAL FORMING 

      Autor: Pačák , Tomáš; Tatíček , František; Valeš , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      A precise production of sheet metal parts has always been a main goal in press shops. Highest quality demands are required especially in automotive production. Unfortunately, even today, the production is not optimal due ...

    • CYLINDRICAL ROLLER BEARING LUBRICATION REGIMES ANALYSIS AT LOW SPEED AND PURE RADIAL LOAD 

      Autor: Chmelař , Jakub; Petr , Karel; Mikeš , Petr; Dynybyl , Vojtěch
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      In this article, we describe a method of the roller bearing lubrication regime prediction. It uses a mathematical model of the bearing based on the standard ISO/TS 16281 to obtain the external load distribution over the ...

    • CZECH WW2 CONCRETE FORTIFICATIONS: CORROSION PROCESSES AND REMEDIATION METHOD BASED ON CRYSTALLIZING COATING 

      Autor: Pazderka, Jiří; Reiterman, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Concrete is a relatively new structural material, hence the remediation of concrete structures is very rare. There are a lot of concrete fortifications in the Czech Republic, which were built just before WW2. These bunkers ...

    • DEFLECTIONS AND FREQUENCY ANALYSIS IN THE MILLING OF THIN-WALLED PARTS WITH VARIABLE LOW STIFFNESS 

      Autor: Kononenko , Serhii; Dobrotvorskiy , Sergey; Basova , Yevheniia; Gasanov , Magomediemin; Dobrovolska , Ludmila
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The disadvantage of the geometry of thin-walled parts, in terms of processing, is the low ability to resist static and dynamic loads. It is caused by the elastic deformation of elements with a low stiffness. Modelling ...

    • DETERMINATION OF DETONABLE GAS MIXTURE HEAT FLUXES AT THERMAL DEBURRING 

      Autor: Plankovskyy , Sergey; Teodorczyk , Andrzei; Shypul , Olga; Tryfonov , Oleg; Brega , Dmytro
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Modern technology requires a multitude of precise parts that are a necessity in reliable methods of surface finishing. Energy of detonable gas mixture combustion has been used in manufacturing as a processing source for a ...

    • DYNAMIC SMART GRID COMMUNICATION PARAMETERS BASED COGNITIVE RADIO NETWORK 

      Autor: Haider Tarish, Haider; Muhsen Halboot, Dhiaa; Shahadi Ismael, Haider; See Hang, Ong; Elmenreich , Wilfried
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The demand for more spectrums in a smart grid communication network is a significant challenge in originally scarce spectrum resources. Cognitive radio (CR) is a powerful technique for solving the spectrum scarcity problem ...

    • EVALUATING SHEAR STRENGTH OF SAND- GGBFS BASED GEOPOLYMER COMPOSITE MATERIAL 

      Autor: Al-Rkaby, Alaa Hussein Jassim
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Geopolymer has been emerging as a novel and sustainable replacement for the traditional soil improvement materials, such as ordinary Portland cement OPC and lime, which have severe environmental impacts. In this paper, a ...

    • EVALUATION OF RAILWAY BALLAST LAYER CONSOLIDATION AFTER MAINTENANCE WORKS 

      Autor: Sysyn , Mykola; Nabochenko , Olga; Kovalchuk , Vitalii; Gerber , Ulf
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The results of the study of the ballast layer consolidation after the work of ballast-tamping machines of different types are given in the article. The existing methods of determining the degree of consolidation of the ...

    • FABRICATION OF Mg-Zn-Al HYDROTALCITE AND ITS APPLICATION FOR Pb<sup>2+</sup> REMOVAL 

      Autor: Heraldy , Eddy; Rahmawati , Fitria; Ardiyanti , Dwi; Nurmawanti , Ika
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The fabrication of Mg-Zn-Al Hydrotalcite (HT) was carried out by the co-precipitation method at various molar ratios. The Mg-Zn-Al HT compound at the optimum molar ratio was then calcined to determine the effect of calcination ...

    • GAS-PUFF TARGET FOR LASER-PRODUCING PLASMA SXR SOURCE 

      Autor: Salačová , Šárka; Wachulak , Przemyslaw; Tatíček , Milan; Vrbová , Miroslava
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Mass density spatial distributions of selected gas-puff targets have been determined by radiography, using quasi-monochromatic radiation at a wavelength of 13 nm. Results of spatial distributions of mass densities at various ...

    • GENERAL CALCULATION OF WINDING FACTOR FOR MULTI-PHASE/-LAYER ELECTRICAL MACHINES IRRESPECTIVE OF POLES NUMBER 

      Autor: Ouamara , Daoud; Dubas , Frédéric; Randi Ali, Sid; Benallal Nadjib, Mohamed; Espanet , Christophe
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      In this paper, a method to calculate the winding factor by only considering stator parameters without the rotor ones is developed. This is interesting because it allows the separation of the stator and rotor design, unlike ...

    • GENERAL MODEL OF RADIATIVE AND CONVECTIVE HEAT TRANSFER IN BUILDINGS: PART I: ALGEBRAIC MODEL OF RADIATIVE HEAT TRANSFER 

      Autor: Ficker , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      Radiative heat transfer is the most effective mechanism of energy transport inside buildings. One of the methods capable of computing the radiative heat transport is based on the system of algebraic equations. The algebraic ...

    • GENERAL MODEL OF RADIATIVE AND CONVECTIVE HEAT TRANSFER IN BUILDINGS: PART II: CONVECTIVE AND RADIATIVE HEAT LOSSES 

      Autor: Ficker , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      The present paper represents the second part of the serial publication, which deals with convective and radiative heat transfers in buildings. The algebraic computational method for combined convective-radiative heat ...

    • HEAT FLUX JUMP METHOD AS A POSSIBILITY OF CONTACTLESS MEASUREMENT OF LOCAL HEAT TRANSFER COEFFICIENTS 

      Autor: Solnař, Stanislav; Dostál, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2019)
      This article deals with the derivation of the temperature response of the finite thickness wall, which is heated by heat flow, as a possibility to measure the local values of the heat transfer coefficient with a very high ...