Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 234-253 z 880

    • Determination of fan design parameters for light-sport aircraft 

      Autor: Klesa, Jan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      This paper is focused on the preliminary design of an electric fan for light-sport aircraft. Usage of electric motors brings some advantages compared to piston engines, especially small size and the independence of power ...

    • Determination of loads on the body of a boxcar with elastic elements in the center sill 

      Autor: Fomin, Oleksij; Glib, Vatulia; Alyona, Lovska
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      The authors suggest elastic elements in the body of a centre sill being the basic carrying element of the frame to decrease the dynamic loads. This solution can transform the dynamic loads on the body into the work of the ...

    • Determination of Uncertainties for Correlated Input Quantities by the Monte Carlo Method 

      Autor: Goliaš , Marcel; Palenčár , Rudolf
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper presents the calculation of the uncertainty for distribution propagation by the Monte Carlo method for a measurement model with one output quantity. The procedure is shown on the basis of an example of the ...

    • DETERMINATION OF WATER CONTENT IN PYROLYTIC TARS USING COULOMETRIC KARL-FISHER TITRATION 

      Autor: Jílková , Lenka; Hlinčík , Tomáš; Ciahotný , Karel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The liquid organic fraction of pyrolytic tar has a high energy value which makes possible its utilization as an energy source. However, before utilization, it is crucial to remove water from the liquid fraction. The presence ...

    • DETERMINING THE ROLE OF INDIVIDUAL FLY ASH PARTICLES IN INFLUENCING THE VARIATION IN THE OVERALL PHYSICAL, MORPHOLOGICAL, AND CHEMICAL PROPERTIES OF FLY ASH 

      Autor: Haider, Usman; Bittnar, Zdenek; Kopecky, Lubomír; Šmilauer, Vít; Pokorny, Jaroslav; Zaleska, Martina; Prošek, Zdenek; Hrbek, Vladimír
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      The properties of fly ashes vary because of the differences in the properties of their individual particles, and the determination of variation in these properties is of interest to the industries which use pulverized raw ...

    • 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 an Ultralight with a Ducted Fan 

      Autor: Brabec , Jiří; Helmich , Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper introduces the UL-39 project, an ultralight aircraft with a ducted fan, and some of the problems that have arisen in the course of its development. Several problems with the design of a non-traditional aircraft ...

    • DEVELOPMENT OF NUMERICAL MODELS FOR THE PREDICTION OF TEMPERATURE AND SURFACE ROUGHNESS DURING THE MACHINING OPERATION OF TITANIUM ALLOY (Ti6Al4V) 

      Autor: Daniyan , Ilesanmi; Tlhabadira , Isaac; Mpofu , Khumbulani; Adeodu , Adefemi
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      Temperature and surface roughness are important factors, which determine the degree of machinability and the performance of both the cutting tool and the work piece material. In this study, numerical models obtained from ...

    • 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 ...

    • Diamond Films for Implantable Electrodes 

      Autor: Henychová , Petra; Hiřmanová , Klára; Vraný , Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Diamond is a promising material for implantable electrodes due to its unique properties. The aim of this work is to investigate the growth of boron-doped nanocrystalline diamond (B-NCD) films by plasma-enhanced microwave ...

    • 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 ...

    • DIFFUSE DBD IN ATMOSPHERIC AIR AT DIFFERENT APPLIED PULSE WIDTHS 

      Autor: Shershunova Alexandrovna, Ekaterina; Malashin , Maxim; Moshkunov , Sergei; Khomich , Vladislav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      The paper deals with the realization and the diagnostics of the volume diffuse dielectric barrier discharge in 1-mm air gap when applying high voltage rectangular pulses to the electrodes. The effect of the applied pulse ...

    • Digital model of automated unmanned aerial vehicle with edge computing application for railway reconnaissance 

      Autor: Tulembayeva, Aigul; Ashirov, Shayakhmet; Makarov, Evgenij; Seitbattalov, Zhexen
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2024)
      In the last decade, unmanned aerial vehicles have been widely used in various civil and military field operations. Most modern drones are manually controlled by an operator and require decision making, which requires ...

    • DIRAC AND HAMILTON 

      Autor: Leach G. L., P.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Dirac devised his theory of Quantum Mechanics and recognised that his operators resembled the canonical coordinates of Hamiltonian Mechanics. This gave the latter a new lease of life. We look at what happens to Dirac’s ...

    • Dirac oscillator in dynamical noncommutative space 

      Autor: Haouam, Ilyas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      In this paper, we address the energy eigenvalues of two-dimensional Dirac oscillator perturbed by a dynamical noncommutative space. We derived the relativistic Hamiltonian of Dirac oscillator in the dynamical noncommutative ...

    • 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. ...

    • Disinfection performance of an ultraviolet lamp: a CFD investigation 

      Autor: Bui, Cuong Mai; Phan, Nguyen Duy Minh; Tran, Ngo Quoc Huy; Doan, Le Anh; Vo, Quang Truong; Tran, Duy Chung; Nguyen, Thi Thanh Vi; Nguyen, Duc Long; Huynh, Van Sanh; Ho, Tran Anh Ngoc
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      Ultraviolet (UV)-based devices have shown their effectiveness on various germicidal purposes. To serve their design optimisation, the disinfection effectiveness of a vertically cylindrical UV lamp, whose wattage ranges ...

    • DISTINGUISHING BETWEEN SPOT AND TORUS MODELS OF HIGH-FREQUENCY QUASIPERIODIC OSCILLATIONS 

      Autor: Karas , Vladimír; Bakala , Pavel; Török , Gabriel; Dovčiak , Michal; Wildner , Martin; Wzientek , Dalibor; Šrámková , Eva; Abramowicz , Marek; Goluchová , Kateřina; Mazur P., Grzegorz; Vincent H., Frédéric
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      In the context of high-frequency quasi-periodic oscillation (HF QPOs) we further explore the appearance of an observable signal generated by hot spots moving along quasi-elliptic trajectories close to the innermost stable ...

    • 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 ...

    • 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 ...