Number of found documents: 504
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Utsunomiya University – Prototyping of pump laser optics for compact thin disk head
Miura, Taisuke
2015 - English
We have constructed a compact thin disk head designed by HiLASE. We demonstrated the CW output from the thin disk head with the efficiency of higher than 30% and the good beam quality. This result leaded to the additional contract with Utsunomiya University on February 2016. Keywords: pump laser; optics; compact thin disk head Available at various institutes of the ASCR
Utsunomiya University – Prototyping of pump laser optics for compact thin disk head

We have constructed a compact thin disk head designed by HiLASE. We demonstrated the CW output from the thin disk head with the efficiency of higher than 30% and the good beam quality. This result ...

Miura, Taisuke
Fyzikální ústav, 2015

MEDICEM Institute, spol. s.r.o. - Technology to shape hydrogels by lasers
Rostohar, Danijela; Flimelová, Miroslava
2015 - English
We have prepared study with aim to propose a technology allowing to shape hydrogels by lasers and to describe a project (including timelines, milestones, team and budget) that would lead to the development of such technology, including supportive scientific, technical and theoretical information. Keywords: hydrogels; lasers; intraocular implants; intraocular lenses Available at various institutes of the ASCR
MEDICEM Institute, spol. s.r.o. - Technology to shape hydrogels by lasers

We have prepared study with aim to propose a technology allowing to shape hydrogels by lasers and to describe a project (including timelines, milestones, team and budget) that would lead to the ...

Rostohar, Danijela; Flimelová, Miroslava
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

Doped DLC coatings for biomedical applications
Písařík, Petr
2015 - English
Nowadays there are materials having excellent properties for use in medicine (Diamond-like carbon, Hydroxyapatite, …). Diamond-like carbon (DLC) is a metastable form of amorphous carbon containing bonded carbon atoms of sp2 and sp3 hybridized orbital. DLC layers are semiconductors with high mechanical hardness, chemical inertness, low coefficient of friction, high thermal conductivity, good electrical and optical properties, biocompatibility and no cytotoxicity. All properties of the films are not always ideal, so it is necessary to modify the layer. One example of how to modify the properties of thin layers are dopations. The incorporation of dopants in films may lead to greater multifunctionality and much improved properties. Most modifications were made to modify contact angle and surface energy, to reduce internal stresses, to decrease surface roughness, coefficient of friction or wear.... Keywords: silver doped; diamond like carbon; thin layers; mechanical properties Available at various institutes of the ASCR
Doped DLC coatings for biomedical applications

Nowadays there are materials having excellent properties for use in medicine (Diamond-like carbon, Hydroxyapatite, …). Diamond-like carbon (DLC) is a metastable form of amorphous carbon containing ...

Písařík, Petr
Fyzikální ústav, 2015

Computational study of cellular assembly on hydrophobic/hydrophilic micro-patterns
Ukraintsev, Egor; Brož, A.; Kalbáčová, M.H.; Kromka, Alexander; Rezek, Bohuslav
2015 - English
We develop simple onedimensional stochastic model of cell behavior on chemically patterned surfaces that is based on three key parameters: speed of cell movement (motility) across substrate, probability of cell adhesion to substrate, and probability of cell division on substrate when adhered on substrate. Amount of adhered cells on hydrophobic and hydrophilic regions is calculated as function of time (number of cycles up to 2000). The model is correlated with in-vitro data obtained within 48 h in real time. We show that this simple stochastic model with the three parameters (where cell motility is the most important one) can describe with high accuracy the experimental data and thereby explain the observed preferential cell assembly on hydrophilic/hydrophobic micro-patterns (up to 200 um width). Keywords: SAOS-2 cells; cell movement; adhesion; stochastic computer simulations Available at various institutes of the ASCR
Computational study of cellular assembly on hydrophobic/hydrophilic micro-patterns

We develop simple onedimensional stochastic model of cell behavior on chemically patterned surfaces that is based on three key parameters: speed of cell movement (motility) across substrate, ...

Ukraintsev, Egor; Brož, A.; Kalbáčová, M.H.; Kromka, Alexander; Rezek, Bohuslav
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

Hydrogen-terminated diamond surface as gas sensing layer working at room temperature
Davydova, Marina; Kulha, P.; Babchenko, Oleg; Kromka, Alexander
2015 - English
Effect of fluorine- and hydrogen-terminated diamond surface on the gas sensing properties at room temperature was investigated. The gas sensing properties diamond-based sensor were measured by the changes of electrical resistance to various volatile organic compounds (C6H6, C3H6O, isopropylalcohol) and relative humidity. The comparative sensing performance of hydrogenated diamond surface shows improvement in sensitivity toward benzene, acetone, isopropylalcohol and humid air in contrast to fluorinated diamond surface, where the surface conductivity was suppressed. Keywords: diamond; gas sensor; response; sensitivity Available at various institutes of the ASCR
Hydrogen-terminated diamond surface as gas sensing layer working at room temperature

Effect of fluorine- and hydrogen-terminated diamond surface on the gas sensing properties at room temperature was investigated. The gas sensing properties diamond-based sensor were measured by the ...

Davydova, Marina; Kulha, P.; Babchenko, Oleg; Kromka, Alexander
Fyzikální ústav, 2015

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

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

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