Number of found documents: 500
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Growth of Escherichia coli on nanocrystalline diamond
Jurková, Blanka; Kozak, Halyna; Artemenko, Anna; Ukraintsev, Egor; Beranová, J.; Konopásek, I.; Kromka, Alexander
2015 - English
In this contribution, we compared the attachment of gram-negative model bacterium Escherichia coli to\nuncoated glass and glass coated by hydrogenated and oxidized NCD films. For attachment experiments,\ncontinuous cultivation in commercially available CDC Bioreactor was used. Antibacterial tests indicated\nhigher attachment of gram-negative model bacterium Escherichia coli to NCD surface compared to uncoated\nglass. We assign this effect to higher roughness of NCD surface compared to glass. Bacterial cells preferred\nthe hydrophobic surface of hydrogenated NCD surface to hydrophilic oxidized NCD for their attachment. Keywords: nanocrystalline diamond; bacteria; Escherichia coli; anti-adhesive; CDC Bioreactor Available at various institutes of the ASCR
Growth of Escherichia coli on nanocrystalline diamond

In this contribution, we compared the attachment of gram-negative model bacterium Escherichia coli to\nuncoated glass and glass coated by hydrogenated and oxidized NCD films. For attachment ...

Jurková, Blanka; Kozak, Halyna; Artemenko, Anna; Ukraintsev, Egor; Beranová, J.; Konopásek, I.; Kromka, Alexander
Fyzikální ústav, 2015

Calculations of nanocrystalline diamond-covered waveguides based on amorphous silicon
Jirásek, Vít; Prajzler, Václav; Remeš, Zdeněk
2015 - English
Nanocrystalline diamond (NCD) coatings on planar waveguides (WG) in the IR region allow to design optical sensors sensitive to absorbers like proteins or other biomolecules. In this contribution, we present a 2D model of a multi-layer WG developed under FEM (finite element method) simulation software Comsol Multiphysics. The model is based on the modified wave equation solved in the frequency domain and includes optical absorption. It was found that for the single-mode WG working in the narrow region of 1550-2000 nm the silicon thickness must be 150-320 nm. It was found that in order to keep a reasonable signal attenuation, the NCD film must be prepared with the optical absorption coefficient lower than 10 cm-1, being a rather challenging task. Dependencies of the signal attenuation on the NCD film thickness, absorbing layer height, its absorption coefficient and exciting wavelengths are presented.\n Keywords: nanocrystalline diamond; amorphous silicon; optical waveguides; FEM simulations Available at various institutes of the ASCR
Calculations of nanocrystalline diamond-covered waveguides based on amorphous silicon

Nanocrystalline diamond (NCD) coatings on planar waveguides (WG) in the IR region allow to design optical sensors sensitive to absorbers like proteins or other biomolecules. In this contribution, we ...

Jirásek, Vít; Prajzler, Václav; Remeš, Zdeněk
Fyzikální ústav, 2015

Initial study of structure of nanofiber textiles and the creation of its model
Havrlík, M.; Sveshnikov, Alexey
2015 - English
In this research, the structure of the fabrics was analyzed using an electron scanning microscope Tescan Maia 3. Two sets of the experiments have been carried out. In the first experiment the surface structure of the samples was studied. Photos created by SEM were analyzed using program Atlas and image editor GIMP. In this set of the experiments the initial parameters for the creation of a digital 2D model of a single layer have been determined (fiber size distribution, pore size and curvature of the fibers). In the second set of the experiments cross sections of nanofiber textiles were made in order to study the inner structure of the fabric. This information allows evaluation of the total number of 2D layers in the model and, thus, is very important for future creation of a 3D model of the fabric. Keywords: polymer; SEM photography Available at various institutes of the ASCR
Initial study of structure of nanofiber textiles and the creation of its model

In this research, the structure of the fabrics was analyzed using an electron scanning microscope Tescan Maia 3. Two sets of the experiments have been carried out. In the first experiment the surface ...

Havrlík, M.; Sveshnikov, Alexey
Fyzikální ústav, 2015

Nanomechanical testing of an a-C:N nanolayer prepared by ion beam assisted deposition on Ti.sub.6./sub.Al.sub.4./sub.V alloy
Vlčák, P.; Šepitka, J.; Horaždovský, T.; Jirka, Ivan; Gregora, Ivan; Němec, M.
2015 - English
We applied ion beam assisted deposition for preparing a-C:N nanolayers on Ti6Al4V alloy. A Hysitron TI 950 TriboIndenter (TM) nanomechanical test instrument was used to assess the depth profiles of the mechanical properties on modified titanium substrates. Two methods were employed : a) quasistatic partial unload, and b) dynamic Continuous Measurement of X (CMX). The average nanoindentation hardness increased from HIT similar to 5GPa for a reference sample to HIT similar to 8.6 GPa for a sample coated by an a-C nanolayer, and to HIT similar to 11.5 GPa for a sample coated by an a-C:N nanolayer. The average storage modulus of the sample coated by a-C:N increased from E' similar to 130 GPa (reference sample) to E' similar to 155 GPa. The storage modulus of the sample coated by the a-C nanolayer was less than the storage modulus of the titanium substrate. Keywords: carbon-based materials; hardness; ion beam assisted deposition; a-C:N nanolayer Available at various institutes of the ASCR
Nanomechanical testing of an a-C:N nanolayer prepared by ion beam assisted deposition on Ti.sub.6./sub.Al.sub.4./sub.V alloy

We applied ion beam assisted deposition for preparing a-C:N nanolayers on Ti6Al4V alloy. A Hysitron TI 950 TriboIndenter (TM) nanomechanical test instrument was used to assess the depth profiles of ...

Vlčák, P.; Šepitka, J.; Horaždovský, T.; Jirka, Ivan; Gregora, Ivan; Němec, M.
Fyzikální ústav, 2015

Studium tepelných procesů v systému Er:Li.sub.2./sub.O-Y.sub.2./sub.O.sub.3./sub.-P.sub.2./sub.O.sub.5./sub
Zemenová, Petra; Král, Robert; Nitsch, Karel; Cihlář, Antonín; Bystřický, Aleš
2015 - Czech
Tato práce se zabývá studiem vlivu velikosti částic práškových vzorků podchlazené taveniny Er:Li2O-Y2O3-P2O5 při tepelném zatížení na efekty skelné transformace a krystalizace. Dále se zabývá charakterizací mineralogického složení produktů krystalizace a stanovením materiálových vlastností připraveného skla. This work deals with a study of the particle size influence of the thermally treated Er:Li2O-Y2O3-P2O5 glassy powder samples on the effects of glass transformation and crystallization. Further, it presents the mineralogical composition of the crystallization products and material properties of prepared glasses. Keywords: crystallization; system Er:Li.sub.2./sub.O-Y.sub.2./sub.O.sub.3./sub.-P.sub.2./sub.O.sub.5./sub. Available at various institutes of the ASCR
Studium tepelných procesů v systému Er:Li.sub.2./sub.O-Y.sub.2./sub.O.sub.3./sub.-P.sub.2./sub.O.sub.5./sub

Tato práce se zabývá studiem vlivu velikosti částic práškových vzorků podchlazené taveniny Er:Li2O-Y2O3-P2O5 při tepelném zatížení na efekty skelné transformace a krystalizace. Dále se zabývá ...

Zemenová, Petra; Král, Robert; Nitsch, Karel; Cihlář, Antonín; Bystřický, Aleš
Fyzikální ústav, 2015

Škoda Auto a.s. – Výběr optimálního typu laseru pro laserové popisování plechů
Švábek, Roman; Bičišťová, Radka; Flimelová, Miroslava
2015 - Czech
Experimentální popis materiálů laserem s ohledem na technologické požadavky v zadání – použití vhodných typů laserů na základě rešerše (fáze I) a specifikování jejich klíčových technických parametrů (kontinuální vs pulsní režim, vlnová délka, délka pulsu tvar pulsu, výkon, frekvence atd.). Výstupem je doporučení vhodného typu laseru vhodného pro tuto technologii. Experimental processing of materials with laser beam according the technological requirements of the assignment - the use of appropriate types of lasers based on research ( Phase I) and specify their key technical parameters ( continuous vs pulsed mode, wavelength, pulse duration , pulse shape , power, frequency etc. ). The output is a recommendation of the appropriate type of laser suitable for this technology. Keywords: laser material processing Available at various institutes of the ASCR
Škoda Auto a.s. – Výběr optimálního typu laseru pro laserové popisování plechů

Experimentální popis materiálů laserem s ohledem na technologické požadavky v zadání – použití vhodných typů laserů na základě rešerše (fáze I) a specifikování jejich klíčových technických parametrů ...

Švábek, Roman; Bičišťová, Radka; Flimelová, Miroslava
Fyzikální ústav, 2015

L.E.T. optomechanika Praha, spol. s.r.o. – testování tenkých vrstev vytvořených napařováním a naprašováním
Řeháková, Martina
2015 - Czech
Byly otestovány tenké vrstvy vytvořené napařováním a naprašováním, které jsou používány pro optické komponenty výkonových laserů, podle požadavků zadavatele.: materiály podložek: floutová skla, borosilikátová skla, apod.; antireflexní vrstvy širokopásmové, dvouvrstvé, jednoduché; reflexní vrstvy Al, Al + SiO2, +MgF2; vrstvy Cr , Cr2O3, Au a případně další varianty dle požadavků. Were tested by thin layer formed by deposition and sputtering, which are used for optical components power lasers, according to customer requirements.: based material. float glass, borosilicate glass, etc.; broadband anti-reflection coating, dual-layer, single; reflective layer Al, Al + SiO2 + MgF2;layers of Cr, Cr2O3, Au or other variants as required Keywords: optical reflective layers; reflectance; thickness of layer; roughness of layer; resistance layers testing in laser beam Available at various institutes of the ASCR
L.E.T. optomechanika Praha, spol. s.r.o. – testování tenkých vrstev vytvořených napařováním a naprašováním

Byly otestovány tenké vrstvy vytvořené napařováním a naprašováním, které jsou používány pro optické komponenty výkonových laserů, podle požadavků zadavatele.: materiály podložek: floutová skla, ...

Řeháková, Martina
Fyzikální ústav, 2015

FLC-15: Challenges in polar self-assembling systems
Bubnov, Alexej; Glogarová, Milada
2015 - English
This is the Book of Abstracts for the 15th International Conference on Ferroelectric Liquid Crystals (FLC-15 conference) held in Prague on June 28 - July 3, 2015. The broadening of the field compared to the beginning of this biennial series in 1987 is expressed in the conference subtitle: Challenges in polar self-assembling systems. The continuous worldwide interest to this conference series is proving that it has still a respected position within the series of International/European conferences on liquid crystals covering all interdisciplinary field of the liquid crystal research. At the FLC-15 conference more than 130 participants from 25 countries all over the world will present 5 key-note lectures, 14 invited talks and selected 39 oral contributions. The number has been limited to keep the single session conference format as it is a tradition for the FLC conference series. About 90 posters were presented in two poster sessions. For your convenience, the FLC-15 conference program is presented in this book. Keywords: ferroelectric liquid crystals; polar liquid crystalline phases Available at various institutes of the ASCR
FLC-15: Challenges in polar self-assembling systems

This is the Book of Abstracts for the 15th International Conference on Ferroelectric Liquid Crystals (FLC-15 conference) held in Prague on June 28 - July 3, 2015. The broadening of the field compared ...

Bubnov, Alexej; Glogarová, Milada
Fyzikální ústav, 2015

Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains
Čermák, Jan; Yamada, T.; Ganzerová, Kristína; Rezek, Bohuslav
2014 - English
We study graphene grown across the boundary of three such grains having bright, medium, and dark color in reflection. Raman micro-spectroscopy proves presence of mostly a monoor bi-layer graphene on all the grains. Yet intensity of Raman 2D band is grain-dependent: highest at the darkest grain and lowest at the brightest one. Contrary, conductive atomic force microscopy detects the highest conductivity at the brightest grain and the lowest current at the darkest grain. This is attributed to dominant electrical current path through graphene and underlying oxide thickness of which also depends on the type of copper grain. We correlate and discuss the results with view to better understanding of graphene growth and electronic properties on large area copper substrates. Keywords: graphene; chemical vapor deposition; atomic force microscopy; Raman spectroscopy; electronic properties Available at various institutes of the ASCR
Microscopic characterization of graphene material and electronic quality across neighbouring, differently oriented copper grains

We study graphene grown across the boundary of three such grains having bright, medium, and dark color in reflection. Raman micro-spectroscopy proves presence of mostly a monoor bi-layer graphene on ...

Čermák, Jan; Yamada, T.; Ganzerová, Kristína; Rezek, Bohuslav
Fyzikální ústav, 2014

Development of materials science in research and education. Book of abstracts of the 24th joint seminar
Kožíšek, Zdeněk; Nitsch, Karel
2014 - English
Topics: - Trends in development of materials research - Education of materials science at the universities - Information about the research programmes of individual institutions - Information on equipment for preparation and characterisation of materials - Results of materials science research Keywords: material sciences Available at various institutes of the ASCR
Development of materials science in research and education. Book of abstracts of the 24th joint seminar

Topics: - Trends in development of materials research - Education of materials science at the universities - Information about the research programmes of individual institutions - Information on ...

Kožíšek, Zdeněk; Nitsch, Karel
Fyzikální ústav, 2014

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