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Elektronický sborník příspěvků multioborové konference LASER57
Růžička, Bohdan
2017 - Czech
Konference LASER57 je mezioborová a intersektorová akce, na které se mohou potkat profesionálové z různých oborů. Společným jmenovatelem jsou lasery, optika a jejich aplikace. Účastníci pocházejí z různých prostředí (soukromé společnosti, vysoké školy, veřejné výzkumné organizace atd.). Conference LASER57 is a multidisciplinary and intersectoral event where different kind of specialist can meet each other. They come from various environments (private company, university, public research organization etc.). Their common denominators are laser, optics and its applications.\n\n Keywords: laser; laser technology; optics; optical fiber Fulltext is available at external website.
Elektronický sborník příspěvků multioborové konference LASER57

Konference LASER57 je mezioborová a intersektorová akce, na které se mohou potkat profesionálové z různých oborů. Společným jmenovatelem jsou lasery, optika a jejich aplikace. Účastníci pocházejí z ...

Růžička, Bohdan
Ústav přístrojové techniky, 2017

In vivo study of diatom assemblages using low temperature method for ESEM
Tihlaříková, Eva; Neděla, Vilém; Fránková, Markéta
2017 - English
Diatoms are the most species-rich algal group represented by 12 000 described species and are recognized as powerful bio indicators and used for water quality monitoring. Diatom taxonomy is predominantly based on the morphology of ornate silicified cell wall called frustule composed of two overlapping parts (thecae). This frustule displays intricate patterns and designs unique to each species. For these studies conventional scanning electron microscopy (SEM) was and still is widely used. This method requires cleaning of diatom frustules in strong acids and peroxides followed by conductive coating.This aggressive procedure removes protoplast and damages delicate structures. Environmental scanning electron microscopy (ESEM) brings advantages of observation of fresh diatom material that are presence of whole intact diatom cells, not only empty diatom frustules, extracellular mucilaginous diatom secrets (e.g. pads, stalks, tubes) and whole diatom assemblages directly in situ together with other algal assemblages (e.g. cyanobacteria or green algae). However, in diatom research, ESEM is used mainly for elimination of conductive coating and observation of these organisms in their native wet state adhered directly on the host plant is not yet common. The ESEM observation of native aquatic samples is usually affected with radiation damage that can be lovered by the use of special methods like the Low Temperature Method (LTM) for the ESEM. Keywords: ESEM; diatom; morphology; LTM Available at various institutes of the ASCR
In vivo study of diatom assemblages using low temperature method for ESEM

Diatoms are the most species-rich algal group represented by 12 000 described species and are recognized as powerful bio indicators and used for water quality monitoring. Diatom taxonomy is ...

Tihlaříková, Eva; Neděla, Vilém; Fránková, Markéta
Ústav přístrojové techniky, 2017

Nanopatterning of Silicon Nitride Membranes
Matějka, Milan; Krátký, Stanislav; Řiháček, Tomáš; Kolařík, Vladimír; Chlumská, Jana; Urbánek, Michal
2017 - English
Membranes are typically created by a thin silicon nitride (SIN) layer deposited on a silicon wafer. Both, top and bottom side of the wafer is covered by a thin layer of the silicon nitride. The principle of silicon nitride membranes preparation is based on the wet anisotropic etching of the bottom side of the silicon wafer with crystallographic orientation (100). While the basic procedure for the preparation of such membranes is well known, the nano patterning of thin membranes presents quite important challenges. This is partially due to the mechanical stress which is typically presented within such membranes. The resolution requirements of the\nmembrane patterning have gradually increased. Advanced lithographic techniques and etching procedures had to be developed. This paper summarizes theoretical aspects, technological issues and achieved results. The application potential of silicon nitride membranes as a base for multifunctional micro system (MMS) is also\ndiscussed. Keywords: e-beam writer; silicon nitride membranes; nano patterning; anisotropic etching Available at various institutes of the ASCR
Nanopatterning of Silicon Nitride Membranes

Membranes are typically created by a thin silicon nitride (SIN) layer deposited on a silicon wafer. Both, top and bottom side of the wafer is covered by a thin layer of the silicon nitride. The ...

Matějka, Milan; Krátký, Stanislav; Řiháček, Tomáš; Kolařík, Vladimír; Chlumská, Jana; Urbánek, Michal
Ústav přístrojové techniky, 2017

Noise behaviour of field emission cathode based on lead pencil graphite
Knápek, Alexandr; Horáček, Miroslav; Hrubý, František; Šikula, J.; Kuparowitz, T.; Sobola, D.
2017 - English
The paper describes electrical noise of experimental field emission cathodes based on “polymer” pencil leads which have a high content of hybridized carbon with a low degree of surface oxidation and silicon monoxide (SiO). Charge transport within experimental samples is evaluated based on results provided by the noise spectroscopy method. The paper also briefly describes the experimental preparation method of graphite tips based on ion milling which allow obtaining ultrasharp tips of a diameter lower than 100 nm. Keywords: field emission; lead pencil graphite; noise spectroscopy Available at various institutes of the ASCR
Noise behaviour of field emission cathode based on lead pencil graphite

The paper describes electrical noise of experimental field emission cathodes based on “polymer” pencil leads which have a high content of hybridized carbon with a low degree of surface oxidation and ...

Knápek, Alexandr; Horáček, Miroslav; Hrubý, František; Šikula, J.; Kuparowitz, T.; Sobola, D.
Ústav přístrojové techniky, 2017

Resampling in magnetic resonance spectroscopy-A less model-dependent quantitation quality assessment method
Jabłoński, Michal; Starčuková, Jana; Starčuk jr., Zenon
2017 - English
In this paper we propose a novel method for magnetic resonance spectroscopy (MRS) fitting quality assessment based on time domain resampling of acquired spectra and bootstrapping of the obtained results. The authors introduce two resampling strategies and example results are shown. The proposed method requires MRS data without averaging. Keywords: magnetic resonance spektroscopy; quantitation; fitting Quality Assessment Available at various institutes of the ASCR
Resampling in magnetic resonance spectroscopy-A less model-dependent quantitation quality assessment method

In this paper we propose a novel method for magnetic resonance spectroscopy (MRS) fitting quality assessment based on time domain resampling of acquired spectra and bootstrapping of the obtained ...

Jabłoński, Michal; Starčuková, Jana; Starčuk jr., Zenon
Ústav přístrojové techniky, 2017

Effect of gold coating on emissivity and absorptivity of Ti-6Al-4V alloy
Frolec, Jiří; Králík, Tomáš; Musilová, Věra; Urban, Pavel
2017 - English
The article provides experimental analysis of total hemispherical emissivity and absorptivity of Ti-6Al-4V alloy before and after deposition of 1-2 .pí.m gold layer. We measured their dependences on the temperature of thermal radiation (varying from 20 K to 320 K) and confronted these results with mechanically polished copper, i.e. with material known for extremely low emissivity and absorptivity. Galvanic deposition of pure gold resulted in significant lowering of original emissivity of Ti-6Al-4V bare surfaces from 15.8 percent to 3.4 percent at 300 K and from 4.1 percent to 1.1 percent at 20 K. Our findings about thermal-radiative properties have practical relevance for an improvement of a low temperature part of an ultra-high vacuum scanning probe microscope\n(UHV-SPM) designed by our group and could also be useful for other applications and low temperature systems. Keywords: cryogenics; gold films; heat transfer; thermal radiation Available at various institutes of the ASCR
Effect of gold coating on emissivity and absorptivity of Ti-6Al-4V alloy

The article provides experimental analysis of total hemispherical emissivity and absorptivity of Ti-6Al-4V alloy before and after deposition of 1-2 .pí.m gold layer. We measured their dependences on ...

Frolec, Jiří; Králík, Tomáš; Musilová, Věra; Urban, Pavel
Ústav přístrojové techniky, 2017

Role of the superconductivity in radiative heat transfer
Králík, Tomáš; Musilová, Věra; Srnka, Aleš; Fořt, Tomáš; Frolec, Jiří
2017 - English
The absorption and emission of thermal radiation by metals is related to their electrical properties that are influenced by impurities, defects and temperature. We show by some examples of measurements on common metals how different can be the thermal radiative properties. When the heat is transferred across a microscopic vacuum gap in the near field regime, it is possible to achieve a step-like change of the heat\ntransfer based on a superconducting transition. An interesting feature of this effect is the nonlinear thermal conductivity effecting a change of the sign of the differential thermal conductivity across the vacuum gap. Keywords: thermal radiation; near field; superconductivity Available at various institutes of the ASCR
Role of the superconductivity in radiative heat transfer

The absorption and emission of thermal radiation by metals is related to their electrical properties that are influenced by impurities, defects and temperature. We show by some examples of ...

Králík, Tomáš; Musilová, Věra; Srnka, Aleš; Fořt, Tomáš; Frolec, Jiří
Ústav přístrojové techniky, 2017

SMV-2017-04: Vývoj technologie elektronové litografie
Horáček, Miroslav; Kolařík, Vladimír; Matějka, Milan; Krátký, Stanislav; Chlumská, Jana; Meluzín, Petr; Král, Stanislav
2017 - Czech
Výzkum a vývoj v oblasti fyzikální realizace grafických a optických struktur na principu difraktivní optiky prostředky elektronové litografie v záznamovém materiálu neseném křemíkovou nebo skleněnou deskou. Výzkum zahrnuje analýzu grafického resp. optického motivu, výzkum a aplikaci reliéfních struktur realizujících požadované grafické resp. optické vlastnosti, výzkum a modelování možností fyzikální realizace reliéfních struktur, vypracování a analýzu technologie realizace reliéfní struktury s ohledem na limity současných vědeckých přístrojů, ověření teoretických úvah expozicí vzorku reliéfní struktury. Research and development in the field of physical realization of graphic and optical structures based on the principle of diffractive optics by means of electron beam lithography in a recording material supported by a silicon or glass board. The research covers the analysis of the graphical or optical motive, research and application of relief structures implementing the required graphic and optical properties, research and modeling of the physical possibilities of implementation of relief structures, preparation and analysis of technology of implementation of relief structures with regard to the limits of current scientific instruments, verification of theoretical considerations by means of relief structure sample exposure. Keywords: diffractive optical structures; relief structure; e-beam lithography Available at various institutes of the ASCR
SMV-2017-04: Vývoj technologie elektronové litografie

Výzkum a vývoj v oblasti fyzikální realizace grafických a optických struktur na principu difraktivní optiky prostředky elektronové litografie v záznamovém materiálu neseném křemíkovou nebo skleněnou ...

Horáček, Miroslav; Kolařík, Vladimír; Matějka, Milan; Krátký, Stanislav; Chlumská, Jana; Meluzín, Petr; Král, Stanislav
Ústav přístrojové techniky, 2017

Sborník příspěvků multioborové konference LASER57
Růžička, Bohdan
2017 - Czech
Konference LASER57 je mezioborová a intersektorová akce, na které se mohou potkat profesionálové z různých oborů. Společným jmenovatelem jsou lasery, optika a jejich aplikace. Účastníci pocházejí z různých prostředí (soukromé společnosti, vysoké školy, veřejné výzkumné organizace atd.). Conference LASER57 is a multidisciplinary and intersectoral event where different kind of specialist can meet each other. They come from various environments (private company, university, public research organization etc.). Their common denominators are laser, optics and its applications.\n\n Keywords: laser; laser technology; optics; optical fiber Available at various institutes of the ASCR
Sborník příspěvků multioborové konference LASER57

Konference LASER57 je mezioborová a intersektorová akce, na které se mohou potkat profesionálové z různých oborů. Společným jmenovatelem jsou lasery, optika a jejich aplikace. Účastníci pocházejí z ...

Růžička, Bohdan
Ústav přístrojové techniky, 2017

Experimentální fluorescenční zařízení pro dielektroforetické třídění kapének v mikrofluidních čipech
Ježek, Jan; Pilát, Zdeněk; Šmatlo, Filip; Zemánek, Pavel
2017 - Czech
V současné době mnoho chemických a biologických oborů využívá pro své pozorování různé formy spektroskopie. Jednou z nejrozšířenějších metod je fluorescenční spektroskopie. Zároveň se v posledních sedmi letech začaly bouřlivě rozvíjet mikrofluidní techniky, které využívají mikrofluidních kanálků, kterými protéká nosná kapalina, která unáší kapénky o průměru od jednotek po desítky až stovky mikrometrů. Tyto kapénky, nemísitelné s nosnou kapalinou, slouží jako kapalné mikrokontejnery, obsahující analyzovaný vzorek a nezbytné reagencie. Pomocí speciálních mikrofluidních technik lze, např. fúzovat kapénky s různým obsahem (řízené spouštění chemických reakcí), vysokou rychlostí měnit koncentrace reaktantů v kapénce (koncentrační gradienty), třídit kapénky podle obsahu (vytváření nových kmenů buněk), apod. At present, many chemical and biological disciplines use different forms of spectroscopy for their observations. One of the most common methods is fluorescence spectroscopy. During the last seven years, microfluidic techniques began developing rapidly, using channels in which two immiscible liquids create droplets with diameters from units to tens to hundreds of micrometers. These droplets serve as liquid microcontainers containing the analysed sample and the necessary reagents. Using special microfluidic techniques, it is possible to fuse droplets with different contents (controlled triggering of chemical reactions), to change the concentration of reactants in the droplet with high speed (concentration gradients), or sort the droplets by content (creation of new cell strains).\n\n Keywords: fiber optics; laser systems; microfluidic chips; microcapades; spectroscopy; dielectrophoretic sorting Available at various institutes of the ASCR
Experimentální fluorescenční zařízení pro dielektroforetické třídění kapének v mikrofluidních čipech

V současné době mnoho chemických a biologických oborů využívá pro své pozorování různé formy spektroskopie. Jednou z nejrozšířenějších metod je fluorescenční spektroskopie. Zároveň se v posledních ...

Ježek, Jan; Pilát, Zdeněk; Šmatlo, Filip; Zemánek, Pavel
Ústav přístrojové techniky, 2017

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