Prohlížení Acta Polytechnica dle názvu

Zobrazují se záznamy 376-395 z 880

    • Heat transfer characteristics of double pipe heat exchanger having externally enhanced inner pipe 

      Autor: Vijayaragavan, Balasubramanian; Asok, Suyambu Pandian; Shakthi Ganesh, Chandrasekar Ramalekshmi
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2023)
      An investigation on enhancement of heat transfer is carried out for a double pipe heat exchanger in which the outer wall of the inner pipe is provided with circumferential labyrinth passages. Rectangular and triangular ...

    • HEAT TRANSFER ENHANCEMENT AND FRICTION IN DOUBLE PIPE HEAT EXCHANGER WITH VARIOUS NUMBER OF LONGITUDINAL GROOVES 

      Autor: Sunu , Putu Wijaya; Anakottapary , Daud Simon; Suarta , I Made; Santosa , I Dewa Made Cipta; Suarsana , Ketut
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      It has been found out that heat exchangers with longitudinal grooves produce better heat transfer than those without longitudinal grooves. However, up to now, there have been few investigations and applications of longitudinal ...

    • HEAT TRANSFER ENHANCEMENT AND PRESSURE DROP OF GROOVED ANNULUS OF DOUBLE PIPE HEAT EXCHANGER 

      Autor: Sunu Wijaya, Putu; Rasta Made, I
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      This investigation was performed to experimentally investigate the enhancement of heat transfer and the friction of an annulus in a double pipe heat exchanger system with rectangular grooves in the turbulent flow regime. ...

    • HEIGHT AND WIDTH PARAMETERS FOR ENSURING PASSAGE OF EXCESSIVE LOADS ON ROADS 

      Autor: Petrů , Jan; Křivda , Vladislav
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      The article deals with the problem of passage of excessive transports on the roads and ensuring the necessary height and width parameters for this transport in the Czech Republic. Currently is lack of regulations for the ...

    • Hierarchical Modeling of Mastic Asphalt in Layered Road Structures Based on the Mori-Tanaka Method 

      Autor: Valenta , Richard; Šejnoha , Michal
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      We present an application of the Mori-Tanaka micromechanical model for a description of the highly nonlinear behavior of asphalt mixtures. This method is expected to replace an expensive finite element-based fully-coupled ...

    • High-Speed Monitoring of Dust Particles in ITER ELMs Simulation Experiments with QSPA Kh-50 

      Autor: Makhlaj , Vadym A.; Garkusha , Igor E.; Aksenov , Nikolay N.; Chuvilo , Alexander A.; Landman , Igor S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Dust generation under powerful plasma stream impacts has been studied in ITER ELM simulation experiments with QSPA Kh-50 plasma accelerator. Repetitive plasma exposures of tungsten have been performed by 0.25 ms plasma ...

    • HIGH-TEMPERATURE GASIFICATION OF RDF WASTE AND MELTING OF FLY ASH OBTAINED FROM THE INCINERATION OF MUNICIPAL WASTE 

      Autor: Lázár , Marián; Čarnogurská , Mária; Lengyelová , Marta; Korba , Ján
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      Objective of this paper is to describe innovative solutions of thermal processing of selected components of municipal waste (so-called RDF waste) using low-ionized depended plasma arc generated by a progressive and promising ...

    • HIGHLIGHTS FROM THE LHC 

      Autor: Straessner, Arno
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      The Large Hadron Collider (LHC) and the two multi-purpose detectors, ATLAS and CMS, have been operated successfully at record centre-of-mass energies of 7 ÷ 8TeV. This paper presents the main physics results from proton–proton ...

    • HIGHLY ACCURATE CALCULATION OF THE REAL AND COMPLEX EIGENVALUES OF ONE-DIMENSIONAL ANHARMONIC OSCILLATORS 

      Autor: Fernández Marcelo, Francisco; Garcia , Javier
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2017)
      We draw attention on the fact that the Riccati-Padé method developed some time ago enables the accurate calculation of bound-state eigenvalues as well as of resonances embedded either in the continuum or in the discrete ...

    • Holding Pressure and Its Influence on Quality in PIM Technology 

      Autor: Petera , Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      The PIM (powder injection molding) process consists of several steps in which faults can occur. The quality of the part that is produced usually cannot be seen until the end of the process. It is therefore necessary to ...

    • HOMOGENIZATION OF TRANSPORT PROCESSES AND HYDRATION PHENOMENA IN FRESH CONCRETE 

      Autor: Beneš , Michal; Štefan , Radek
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2020)
      The problem of hydration and transport processes in fresh concrete is strongly coupled and non- inear, and therefore, very difficult for a numerical modelling. Physically accurate results can be obtained using fine-scale ...

    • How to understand the structure of beta functions in six-derivative Quantum Gravity? 

      Autor: Rachwał, Lesław
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)
      We extensively motivate the studies of higher-derivative gravities, and in particular we emphasize which new quantum features theories with six derivatives in their definitions possess. Next, we discuss the mathematical ...

    • HYBRID REASONING FOR MULTI-ROBOT DRILL PLANNING IN OPEN-PIT MINES 

      Autor: Mansouri , Masoumeh; Andreasson , Henrik; Pecora , Federico
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2016)
      Fleet automation often involves solving several strongly correlated sub-problems, including task allocation, motion planning, and coordination. Solutions need to account for very specific, domaindependent constraints. In ...

    • HYBRID SHEARWALL SYSTEM — SHEAR STRENGTH AT THE INTERFACE CONNECTION 

      Autor: Wirth , Ulrich; Shirali , Nuri; Křístek , Vladimír; Kurth , Helmut
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2013)
      Based on a series of alternating, displacement-controlled load tests on ten one-third scale models, to study the behaviour of the interface of a hybrid shear wall system, it was proved that the concept of hybrid construction ...

    • HYDRATION OF PLASMA-TREATED ALUMOSILICATE BINDERS 

      Autor: Šmilauer , Vít; Babchenko , Oleg; Potocký , Štepán; Kromka , Alexander
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2014)
      Plasma treatment offers several applications in material science. In this research, the potential of plasma treatment is explored on the hydration of hydrophilic CNT-enriched cement and hydrophilic fly ash. The evolution ...

    • HYDROGENATED TARGETS FOR HIGH ENERGY PROTON GENERATION FROM LASER IRRADIATING IN TNSA REGIME 

      Autor: Torrisi , Lorenzo; Cutroneo , Mariapompea; Ullschmied , Jiri
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2015)
      Polyethylene-based thin targets were irradiated in high vacuum in the TNSA (Target Normal Sheath Acceleration) regime using the PALS laser facility. The plasmais produced in forward direction depending on the laser irradiation ...

    • HYDROPHOBIC IMPREGNATION OF GEOPOLYMER COMPOSITE BY ETHOXYSILANES 

      Autor: Mašek , Zdeněk; Diblikova , Linda
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2018)
      A geopolymer composite was impregnated by incorporating the hydrophobic alkyl group on the outer surface and in the inner structure of the geopolymer. Ethoxysilanes 1H,1H,2H,2H perfluoroctyltriethoxysilane and hexadecylt ...

    • Hydrothermally-calcined waste paper ash nanomaterial as an alternative to cement for clay soil modification for building purposes 

      Autor: Robert, Ubong Williams; Etuk, Sunday Edet; Agbasi, Okechukwu Ebuka; Umoren, Grace Peter; Akpan, Samuel Sunday; Nnanna, Lebe Agwu
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      It has been observed that clay soil cannot be used for building design, unless it is modified by firing or with cement. Either method of stabilization can adversely affect the environment and public health just like ...

    • Hygiena 3, a Forgotten Project for Electrolytic Water Treatment 

      Autor: Drnek , Kryštof
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      In the interwar period, the city of Prague had to resolve the problem of treating the polluted water produced by its citizens. From 1933 - 1936 an ambitious competition was held. The idea behind the competition was to bring ...

    • Hygro-Thermo-Mechanical Analysis of a Reactor Vessel 

      Autor: Kruis , Jaroslav; Koudelka , Tomáš; Krejčí , Tomáš
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      Determining the durability of a reactor vessel requires a hygro-thermo-mechanical analysis of the vessel throughout its service life. Damage, prestress losses, distribution of heat and moisture and some other quantities ...