Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 213-232 z 880

    • 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 ...

    • DECENTRALIZED MULTI-ROBOT PLANNING TO EXPLORE AND PERCEIVE 

      Autor: Matignon , Laetitia; Jeanpierre , Laurent; Mouaddib , Abdel-Illah
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      In a recent French robotic contest, the objective was to develop a multi-robot system able to autonomously map and explore an unknown area while also detecting and localizing objects. As a participant in this challenge, ...

    • 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 ...

    • DEFORMATION ANALYSIS OF LAYERED REINFORCED CONCRETE - FOAM CONCRETE FLOOR SLABS 

      Autor: Lytvyniak , Oksana
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      This article presents a theoretical study of a stress-strain state of layered reinforced concrete - foam concrete floor slabs (hereinafter called as the LRFCS), with the use of a deformation analysis. Compressive and tensile ...

    • DEFORMATION RESPONSE OF GELLAN GUM BASED BONE SCAFFOLD SUBJECTED TO UNIAXIAL QUASI-STATIC LOADING 

      Autor: Kytyr , Daniel; Krčmářová , Nela; Šleichrt , Jan; Fíla , Tomáš; Koudelka , Petr; Gantar , Ana; Novak , Sasa
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This study is focuses on an investigation of the reinforcement effect of the bioactive glass nano-particles in the gellan gum (GG) scaffolds used in bone tissue engineering. The investigated material was synthesized as the ...

    • Delamination of polyimide in hydrofluoric acid 

      Autor: Al-mashaal, Asaad K. Edaan; Cheung, Rebecca
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Wet etching is a critical fabrication step for the mass production of micro and nanoelectronic devices. However, when an extremely corrosive acid such as hydrofluoric (HF) acid are used during etching, an undesirable damage ...

    • DEPENDENCE OF THE VISCOSITY COEFFICIENT OF THE NIOSOMAL DISPERSION ON THE TEMPERATURE AND PARTICLE SIZE OF THE DISPERSED PHASE 

      Autor: Diskaeva, Elena Igorevna; Vecher, Olga Vladimirovna; Bazikov, Igor Alexandrovich; Elbekyan, Karine Sergeevna; Diskaeva, Elena Nikolaevna
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The aim of this study was to experimentally investigate the dependence of viscosity coefficient of niosomal dispersion based on PEG-12 Dimethicone on the temperature and size of niosomes vesicles. The experiments were ...

    • DEPOSITION CARBON NANOSTRUCTURES BY SURFATRON GENERATED DISCHARGE 

      Autor: Davydova , Marina; Smid , Jiri; Hubicka , Zdenek; Kromka , Alexander
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Carbon nanostructures were deposited by surface wave discharge using various Ar/CH4/ CO2 gas mixture ratios. The morphology was controlled by adjusting of gas concentration and was investigated by scanning electron microscopy ...

    • Derivation of entropy production in a fluid flow in a general curvilinear coordinate system 

      Autor: Flídr, Erik
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      The paper deals with the derivation of the entropy production in the fluid flow performed in a general curvilinear coordinate system. The derivation of the entropy production is based on the thermodynamics laws as well as ...

    • DESIGN AND CONSTRUCTION OF A PROTOTYPE SOLAR UPDRAFT CHIMNEY IN ASWAN/EGYPT 

      Autor: Harte , Reinhard; Tschersich , Markus; Höffer , Rüdiger; Mekhail , Tarek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This work is part of a joint project funded by the Science and Technology Development Fund (STDF) of the Arab republic of Egypt and the Federal Ministry of Education and Research (BMBF) of the Federal Republic of Germany. ...

    • Design and simulation of a bearing housing aerospace component from titanium alloy (Ti6Al4V) for additive manufacturing 

      Autor: Oyesola, Moses; Mpofu, Khumbulani; Daniyan, Ilesanmi; Mathe, Ntombi
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      In evaluating emerging technology, such as additive manufacturing, it is important to analyse the impact of the manufacturing process on efficiency in an objective and quantifiable manner. This study deals with the design ...

    • Design development and study of an elastic sectional screw operating tool 

      Autor: Hevko, Roman; Zalutskyi, Sergii; Tkachenko, Ihor; Lyashuk, Oleg; Trokhaniak, Oleksandra
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The results of an elastic sectional screw operating tool development and its production technique are presented in the article under consideration. The operating tool has been made to fix the elastic sections, providing ...

    • DESIGN OF PARTICULATE MATERIAL COMPACTOR ROLLS DIAMETER 

      Autor: Peciar , Peter; Macho , Oliver; Eckert , Maroš; Fekete , Roman; Kotora , Peter; Juriga , Martin; Kabát , Juraj; Gabrišová , Ľudmila; Peciar , Marián
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      At present, in a period of an industrial expansion great emphasis is placed on the environment. That means aiming for a reduced energy consumption, and also lessening dustiness from very fine powder material. This category ...

    • DESIGN OPTIMIZATION OF MOVEABLE MOMENT STABILIZATION SYSTEM FOR ACCESS CRANE PLATFORMS 

      Autor: Ermis, Kemal; Caliskan, Mehmet; Tanriverdi, Muammer
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The popularity of aerial work platforms is rapidly increasing in the mechanization industry. As a result, the safety and structural strength of aerial work platforms should be prioritized.In this study, the mathematical ...

    • Design Process of Energy Effective Shredding Machines for Biomass Treatment 

      Autor: Beniak , Juraj; Ondruška , Juraj; Čačko , Viliam
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The shredding process has not been sufficiently investigated for the design of better, energy and material saving shredding machines. In connection with present-day concern about the environment, ecology, energy saving, ...

    • DESIGN THEORY FOR THE PRESSING CHAMBER IN THE SOLID BIOFUEL PRODUCTION PROCESS 

      Autor: Kováčová , Monika; Matúš , Miloš; Križan , Peter; Beniak , Juraj
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      The quality of a high-grade solid biofuel depends on many factors, which can be divided into three main groups - material, technological and structural. The main focus of this paper is on observing the influence of structural ...

    • Detailed modelling and analysis of digital mho distance relay with single-pole operation 

      Autor: Pinheiro, Paulo Henrique Barbosa de Souza; Santos, Mayara Helena Moreira Nogueira; Colombini, Angelo Cesar; França, Bruno Wanderley; Fortes, Marcio Zamboti
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This paper introduces a methodology for modelling a digital admittance-type distance relay using PSCAD/EMTDC. The proposed distance relay was tested in a simulation of the Brazilian power grid with predetermined fault ...

    • 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 ...

    • Determination of bond model for 7-wire strands in pretensioned concrete beam 

      Autor: Parkhats, Vadzim; Krzywoń, Rafał; Hulimka, Jacek; Kubica, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      A correct choice of a bond model for prestressing tendons is crucial for the right modelling of a structural behaviour of a pretensioned concrete structure. The aim of this paper is the determination of an optimal bond ...