• Design of a frictionless magnetorheological damper with a high dynamic force range 

  Macháček, Ondřej; Kubík, Michal; Strecker, Zbyněk; Roupec, Jakub; Mazůrek, Ivan (SAGE, 2019-03-19)

  This article discusses an increase in dynamic force range in a spring-damper unit achieved by elimination of sealings´ friction. This friction is a part of damping force that cannot be controlled; therefore, it is undesirable ...

• The growth of metastable fcc Fe78Ni22 thin films on H-Si(100) substrates suitable for focused ion beam direct magnetic patterning 

  Gloss, Jonáš; Horký, Michal; Křižáková, Viola; Flajšman, Lukáš; Schmid, Michael; Urbánek, Michal; Varga, Peter (Elsevier, 2019-03-01)

  We have studied the growth of metastable face-centered-cubic, non-magnetic Fe78Ni22 thin films on silicon substrates. These films undergo a magnetic (paramagnetic to ferromagnetic) and structural (fcc to bcc) phase ...

• Visualization of Lubrication Film in Model of Synovial Joint 

  Čípek, Pavel; Rebenda, David; Nečas, David; Vrbka, Martin; Křupka, Ivan; Hartl, Martin (Serbian Tribology Society, 2019-09-27)

  Synovial joint is one of the most important parts for human movement system and the right function of it is necessary. When the synovial joint is damaged by illnesses, destroyed natural joint is exchanged for artificial ...

• A new generalized projection and its application to acceleration of audio declipping 

  Rajmic, Pavel; Záviška, Pavel; Veselý, Vítězslav; Mokrý, Ondřej (MDPI, 2019-09-19)

  In convex optimization, it is often inevitable to work with projectors onto convex sets composed with a linear operator. Such a need arises from both the theory and applications, with signal processing being a prominent ...

• Investigation of pressure swirl sprays using Volumetric PIV 

  Cejpek, Ondřej; Jedelský, Jan; Malý, Milan; Sapík, Marcel; Lízal, František; Koched, Amine (ILASS, 2019-09-04)

  The volumetric measurement technique (V3V-Flex©) was used to investigate the spray generated by two pressure swirl atomizers (PSAs). Both a simplex pressure swirl atomizer and a spill-return pressure swirl atomizer were ...

• Internal flow characteristics in Spill-return pressure-swirl atomizers 

  Malý, Milan; Sapík, Marcel; Cejpek, Ondřej; Lízal, František; Ondráček, Vladimír; Jícha, Miroslav; Jedelský, Jan (ILASS, 2019-09-04)

  The spray produced by pressure-swirl atomizers strongly depends on the character of their internal flow. Flow field inside a swirl chamber of small pressure-swirl spill-return atomizers was examined using high-speed imaging ...

• Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag. 

  Šiler, Pavel; Kolářová, Iva; Novotný, Radoslav; Másilko, Jiří; Bednárek, Jan; Janča, Martin; Koplík, Jan; Hajzler, Jan; Matějka, Lukáš; Marko, Michal; Pokorný, Přemysl; Opravil, Tomáš; Šoukal, František (MDPI, 2019-09-10)

  The work deals with monitoring the effects of zinc on the course of hydration and change of phase composition of cement mixed with slag. The lengths of induction periods were interleaved by exponential function to quantify ...

• Understanding the edge crack phenomenon in ceramic laminates 

  Ševeček, Oldřich; Kotoul, Michal; Leguillon, Dominique; Martin, Éric; Bermejo, Raul (Gruppo Italiano Frattura, 2015-10-05)

  In this work, a 2D parametric finite element model has been developed to predict the onset and propagation of an edge crack in ceramic laminates using a coupled stress-energy criterion. This approach states that a crack ...

• Effects of microstructure and crystallography on crack path and intrinsic resistance to shear-mode fatigue crack growth 

  Pokluda, Jaroslav; Vojtek, Tomáš; Hohenwarter, Anton; Pippan, Reinhard (Italian Group of Fracture, 2015-09-16)

  The paper focuses on the effective resistance and the near-threshold growth mechanisms in the ferritic-pearlitic and the pure pearlitic steel. The influence of microstructure on the shear-mode fatigue crack growth is divided ...

• On the connection between mode II and mode III effective thresholds in metals 

  Vojtek, Tomáš; Žák, Stanislav; Pokluda, Jaroslav (Italian Group of Fracture, 2017-07-01)

  Closure-free long cracks under the remote mode III loading grow in a more complicated way than those under the remote mode II. For bcc metals, a coplanar in-plane spreading of tongues driven by the local mode II loading ...

• Critical applied stresses for a crack initiation from a sharp V-notch 

  Náhlík, Luboš; Hutař, Pavel; Štegnerová, Kateřina (Gruppo Italiano Frattura, 2014-10-31)

  The aim of the paper is to estimate a value of the critical applied stress for a crack initiation from a sharp V-notch tip. The classical approach of the linear elastic fracture mechanics (LELM) was generalized, because ...

• Microcrack interaction with circular inclusion and interfacial zone 

  Profant, Tomáš; Hrstka, Miroslav; Klusák, Jan (Gruppo Italiano Frattura, 2019-01-04)

  A geometrically simplified plane elasticity problem of a finitesmall crack emanating from a thin interfacial zone surrounding the circularinclusion situated in the finite bounded domain is investigated. The crack isarbitrarily ...

• Estimation of stepwise crack propagation in ceramic laminates with strong interfaces 

  Náhlík, Luboš; Štegnerová, Kateřina; Hutař, Pavel (Gruppo Italiano Frattura, 2015-10-01)

  The contribution deals with a description of the specific crack behaviour in the layered alumina-zirconia ceramic laminate. The main aim is to clarify crack behaviour in the compressive layer and provide computational tools ...

• Influence of partial immersion on steel plate dynamic properties 

  Kůrečka, Jan; Habán, Vladimír (EDP Sciences, 2019-06-28)

  Eigenfrequency of object drops when it is submerged in the water compared to an air exposition. In this article the effect of partial submersion on dynamic properties of steel plate is investigated. Changes differ by a ...

• The effect of surface grooves on film breakdowns in point contacts 

  Šperka, Petr; Křupka, Ivan; Hartl, Martin (Elsevier, 2016-10-01)

  Surface roughness plays an important role in transition from full to mixed elastohydrodynamic regime. One kind of features appearing on a real rough surface are grooves longer than contact diameter. It has already been ...

• Straddled numbers: numbers equal to the sum of powers of consecutive primes from the least prime factor to the largest prime factor 

  Kureš, Miroslav (Bulgarian Academy of Sciences, 2019-07-02)

  Positive integers equal to the sum of powers of consecutive primes from the least prime factor to the largest prime factor are studied. They are called the straddled numbers and their properties are derived. There are also ...

• CFD Simulation of Defogging Effectivity in Automotive Headlamp 

  Guzej, Michal; Zachar, Martin (MDPI, 2019-07-01)

  In the past decade, the condensation of internal air humidity in automotive headlamps has become more prevalent than ever due to the increased usage of a new light source—LEDs. LEDs emit far less heat than previously-used ...

• Laminar-turbulent transition in a constricted tube: Comparison of Reynolds-averaged Navier–Stokes turbulence models and large eddy simulation with experiments 

  Elcner, Jakub; Lízal, František; Jedelský, Jan; Tuhovčák, Ján; Jícha, Miroslav (SAGE Journals, 2019-05-27)

  Constricted tubes appear in many engineering as well as biological systems such as blood vessels or pulmonary airways. The aim of this article is to test the ability of different turbulence models to predict the flow field ...

• Sunflower Plants as Bioindicators of Environmental Pollution with Lead (II) Ions 

  Kryštofová, Olga; Shestivska, Violetta; Vašinová Galiová, Michaela; Novotný, Karel; Kaiser, Jozef; Zehnálek, Josef; Babula, Petr; Opatřilová, Radka; Adam, Vojtěch; Kizek, René (MDPI, 2009-06-25)

  In this study, the influence of lead (II) ions on sunflower growth and biochemistry was investigated from various points of view. Sunflower plants were treated with 0, 10, 50, 100 and/or 500 mu M Pb-EDTA for eight days. ...

• Condenser-type Heat Exchanger for Compost Heat Recovery Systems 

  Bajko, Jaroslav; Fišer, Jan; Jícha, Miroslav (MDPI, 2019-04-25)

  The majority of heat released during composting is contained in latent form of water vapour. To improve the rate of heat recovery, a simple heat exchanger based on condensation of compost vapours was designed. A prototype ...

View more