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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 33
Rohan, Eduard , Cimrman, Robert
Acoustic waves in fluid-saturated periodic scaffolds

We consider acoustic wave propagation in periodic scaffolds saturated by inviscid fluid at rest. To analyze the wave dispersion, two approaches are examined: the periodic homogenization (PH) and the Floquet-Bloch wave decomposition (FB). While PH gives dispersion-less response, the FB method ...

Bartoň Klufová, Pavla , Tittel, Jan , Vostřák, Marek , Jansa, Zdeněk , Kříž, Antonín
Corrosion resistance of laser-deposited composite copper-basalt overlay

This paper deals with an assessment of the corrosion resistance of copper-basalt composite cladded by laser. The filler powder for laser overlaying was a mixture of high-purity copper powder Oerlikon METCO 55 consisting of 45–90 µm particles and a basalt powder comprising particles 50–2...

Bartoň Klufová, Pavla , Vostřák, Marek , Kříž, Antonín
Chemical heterogeneity of Inconel 625 overlay with an increased molybdenum content and its evaluation using the potentiodynamic corrosion test

The paper focuses on a detailed analysis of chemical heterogeneity of Inconel 625 overlays with an increased molybdenum content deposited by laser cladding. Fifteen samples of laser overlays on S355J2 steel were prepared, each with an area of 90×140 mm. The thickness of the steel&#...

Rieger, David , Pola, Michal , Franče, Petr , Kadlec, Jaroslav , Kovářík, Tomáš , Kopačka, Pavel
The effect of short carbon fibers on rheological behaviour and mechanical properties of metakaolin-slag geopolymer binder

This study investigates the effects of short carbon fibers addition on rheological behaviour of geopolymer binder and final mechanical strength of prepared composite. The pure geopolymer binder and variously carbon fiber reinforced composites were tested. The pure geopolymer binder was synthesize...

Kovářík, Tomáš , Hájek, Jiří
Porous geopolymers: processing routes and properties

Cellular ceramics constitute a specific class of materials containing a high level of porosity, greater than 60 vol%, which are characterized by the presence of three-dimensionally arranged open and/or closed cells. Because of their structure, cellular ceramics exhibit a unique combination&#...

Rohan, Eduard , Cimrman, Robert
Wave dispersion in fluids saturating periodic scaffolds

We consider acoustic wave propagation in periodic scaffolds perfused by Newtonian or inviscid fluids. To analyze the wave dispersion, two approaches are examined: the periodic homogenization (PH) and the Floquet-Bloch wave decomposition (FB). The dispersion analysis using the FB approach captures...

Vostřák, Marek , Houdková Šimůnková, Šárka , Hruška, Matěj
Comparison of WC and (TiW)C in nickel-based alloy coatings prepared by laser cladding

For wear demanding applications, the coatings, consisting of WC in the nickel-based alloy are often used due to their excellent properties. Nevertheless, there are still limits of these coatings, mainly deterioration of tungsten carbide due to heat load during laser cladding. The suppre...

Hruška, Matěj , Vostřák, Marek , Tesař, Jiří
The influence of oxide layer pattern size created on the surface of C45 steel on laser light absorption during laser quenching procedure

An increase in surface absorptivity can be helpful with a number of laser heat treatment processes. This study examines the relationship between the surface condition and its influence on interaction with a laser beam. The aim of this paper is to examine the effect of the...

Glanc, Aleš , Houdková Šimůnková, Šárka , Vostřák, Marek
Microstructure and tribological behavior of HVOF sprayed and laser treated CoCrTaAlCSiY coatings

Co-based alloys are used over a wide range of application because of their excellent corrosion and wear properties. Especially the Stellites (Co-Cr-W) are well known and quite well researched. The CoCrTaAlCSiY is a new material on the field of thermal spray coatings and due to...

Jansová, M. , Kališ, V. , Rušavý, Z. , Lobovský, L. , Karbanová, J. , Hynčík, L.
Manual perineal protection with various sizes of fetal head

Vychytil, J.
Hybrid human model for industrial applications

Remiš, Tomáš , Kovařík, Tomáš , Bělský, Petr , Kadlec, Jaroslav
Preparation and characterization of PVA nanocomposites with bio-functionalized nanodiamonds

Poly (vinyl alcohol) (PVA) has a long and successful history of applications in the biomedical and pharmaceutical area. At the forefront of multidisciplinary research in nanomedicine, carbon nanomaterials have demonstrated unprecedented potential for a variety of regenerative medicine applications. Na...

Křenek, Tomáš , Kovařík, Tomáš , Docheva, Denitsa , Stich, Theresia , Kadlec, Jaroslav
Titanium-based porous materials with nanostructured bioactive surface for enhanced osseointegration

Despite the great progress that has been achieved in orthopedics biomaterials, fixation of implants to the bone host remains a problem. Mismatch of Young’s moduli of the biomaterials and the surrounding bone has been identified as a major reason for implant loosening following stre...

Kovařík, Tomáš , Hervert, Tomáš , Hájek, Jiří , Křenek, Tomáš , Deshmukh, Kalim , Kadlec, Jaroslav
Hierarchically porous aluminosilicate substrates as a promising carriers for photocatalytic nanoparticles

Recently, wastewater treatment has become a critical issue due to particular concerns for sustainable environment, climate change and industrial growth. There has been a need for readily available and inexpensive solutions between research and industry. Porous aluminosilicate materials based on g...

Gholami, Fatemeh
Catalytic reduction of NO with CO over Supported Fe-Based Catalysts

The catalytic activity of a series of La-Fe catalysts supported on activated carbon was studied for selective catalytic reduction of NO by CO. Increasing the amount of La in the catalyst structure causes an increase in the Fe2+/Fe3+ ratio. The results showed that by incre...

Deshmukh, Kalim , Kovařík, Tomáš , Křenek, Tomáš
Evaluation of microstructural and thermal properties of sol-gel derived silica-titania based porous glasses

In recent years, the synthesis of sol-gel derived porous glasses has drawn widespread attention owing to the convenience and versatility of the sol-gel method. The sol-gel synthesis process mainly involves hydrolysis and condensation of precursors followed by drying and stabilization. The ch...

Bělský, Petr
Small-and wide-angle X-ray scattering (SAXS/WAXS) in materials science

Small-angle X-ray scattering (SAXS) is a well-established characterization method for microstructure (in particular, nanostructure) investigations in various materials. It examines electron density differences to provide information about structural inhomogeneities, particles or pores with size from the near at...

Šotová, Petra , Novák, Petr , Medlín, Rostislav
TEM and SEM investigation of AZO thin film microstructure

The aim of this work is describing of structure of sputtered transparent conductive aluminium-doped zinc oxide (AZO) thin films. The main attention was focused on their lateral size and orientation of the grains. The structual properties of the samples were studied by scanning elec...

Jandová, Dagmar
Intermetallic phases in 3D printed INCONEL 718

Microstructure of 3D printed INCONEL alloy consists of elongated austenitic grains with high density of precipitates. Three types of intermetallic phases, all with the Ni3X stoichiometry, were identified using transmission electron microscopy and energy dispersive X-ray microanalysis. Fine equiaxed ga...

Bricín, David , Jansa, Zdeněk , Somr, Josef , Elmanová, Andrea , Kříž, Antonín
Influence of heat treatment on properties of SD251-PH1 composite produced by additive SLM technology

This study evaluates how heat treatment affects the structure and properties of the engineered composite material SD251-PH1. This material was formed by mixing two powder blends in a weight ratio of 90 wt. % WC-Co powder SD251 with 10 wt. % of a PH1 steel precipitation&#x...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 33