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Crystallization study of Na-Gd phosphate glasses by non-isothermal DTA
Nitsch, Karel; Kožíšek, Zdeněk; Rodová, Miroslava
2007 - Czech
Crystallization kinetics of glass with nominal composition of Ce:NaGd(PO.sub.3./sub.).sub.4./sub. were studied using non-isothermal DTA in order to study its thermal stability. Krystalizace skla o složení Ce:NaGd(PO.sub.3./sub.).sub.4./sub. byla studována v neizotermickém režimu za účelem testování jeho termické stability.
Keywords:
crystallization kinetics; Ce:NaGd(PO.sub.3./sub.).sub.4./sub. glass; non-isothermal DTA
Available at various institutes of the ASCR
Crystallization study of Na-Gd phosphate glasses by non-isothermal DTA
Crystallization kinetics of glass with nominal composition of Ce:NaGd(PO.sub.3./sub.).sub.4./sub. were studied using non-isothermal DTA in order to study its thermal stability.
Selected laser technologies in education of students of physical fields of study
Lapšanská, Hana; Chmelíčková, Hana; Schovánek, Petr; Hrabovský, Miroslav; Kainzová, V.; Halenka, V.
2007 - Czech
This contribution informs about the increasing usage of laser systems in various industrial applications. In the light of this development, it is essential to update current lectures. Students of the physical and technical fields of study should improve their knowledge of basic sorts and principles of laser technologies, which they can come across in their future practice. Our laboratory is equipped with high power laser system, therefore we are able to provide students with experimental work apart from a theoretical presentation. Příspěvek poukazuje na rostoucí využívání laserových systémů v průmyslové výrobě. V návaznosti je nutné modernizovat a rozšiřovat výuku studentů fyzikálních a technických oborů, aby získali přehled o základních typech a principech běžně užívaných laserových technologií, se kterými se mohou setkat ve své budoucí praxi. Vzhledem k vybavenosti naší laboratoře vysokovýkonným laserovým systémem nabízíme studentům kromě teoretického výkladu také možnost řešení experimentálních úloh.
Keywords:
laser technologies; education; experiment
Available at various institutes of the ASCR
Selected laser technologies in education of students of physical fields of study
This contribution informs about the increasing usage of laser systems in various industrial applications. In the light of this development, it is essential to update current lectures. Students of the ...
Generation of singlet oxygen for a chemical oxygen-iodine laser
Čenský, Miroslav; Jirásek, Vít; Špalek, Otomar; Kodymová, Jarmila; Hrubý, Jan
2007 - Czech
The paper deals with a chemical spray singlet oxygen generator for a chemical oxygen-iodine laser that was designed in the Institute of Physics AS in cooperation with the Institute of Thermomechanics AS. Preliminary experimental results obtained on parametric investigation of this device are presented. Článek se týká výzkumu chemického sprejového generátoru singletového kyslíku pro chemický kyslík-jodový laser, který byl originálně navržen v FZÚ AV ve spolupráci s ÚT AV. Jsou uvedeny některé výsledky získané během studia parametrů tohoto generátoru.
Keywords:
generator of singlet oxygen; chemical oxygen-iodine laser; COIL
Available at various institutes of the ASCR
Generation of singlet oxygen for a chemical oxygen-iodine laser
The paper deals with a chemical spray singlet oxygen generator for a chemical oxygen-iodine laser that was designed in the Institute of Physics AS in cooperation with the Institute of Thermomechanics ...
Properties of InAs/GaAs quantum dots in vertically correlated structures with 2 QD layers grown by MOVPE
Vyskočil, Jan; Hospodková, Alice; Pangrác, Jiří; Oswald, Jiří; Mates, Tomáš; Melichar, Karel; Šimeček, Tomislav; Hulicius, Eduard
2006 - Czech
We have studied the shape of QDs in structures with vertically correlated QDs where two layers of QDs were grown. We investigated the influence of spacer thickness on lateral shape (elongation) of QDs and photoluminescence intensity. Studovali jsme tvar QD ve strukturách s vertikálně korelovanými kvantovými tečkami ve dvou vrstvách. Zaměřili jsme se na vliv oddělovací vrstvy na laterální tvar (prodloužení) QD a na intensitu fotoluminiscence.
Keywords:
quantum dot; GaAs; InAs; MOVPE
Available at various institutes of the ASCR
Properties of InAs/GaAs quantum dots in vertically correlated structures with 2 QD layers grown by MOVPE
We have studied the shape of QDs in structures with vertically correlated QDs where two layers of QDs were grown. We investigated the influence of spacer thickness on lateral shape (elongation) of QDs ...
MOVPE InAs/GaAs quantum dots with long-wavelength emission
Oswald, Jiří; Kuldová, Karla; Hospodková, Alice; Hulicius, Eduard; Pangrác, Jiří; Mates, Tomáš; Melichar, Karel; Vyskočil, Jan
2006 - Czech
One method which enables the shift of photoluminescence spectra of InAs/GaAs quantum dots toward longer wavelengths is the covering of the dots by In.sub.x./sub.Ga.sub.1-x./sub.As strain reducing layer. With the increasing x we have observed the shift of PL maxima from 1.28 μm to 1.46 μm. Jedním ze způsobů umožňujících posuv fotoluminiscenčního spektra InAs/GaAs kvantových teček k delším vlnovým délkám je jejich překrytí vrstvou In.sub.x./sub.Ga.sub.1-x./sub.As redukující pnutí. S rostoucím x byl pozorován posuv PL maxima od 1.28 μm k 1.46 μm.
Keywords:
quantum dot; GaAs; InAs; MOVPE; photoluminescence
Available at various institutes of the ASCR
MOVPE InAs/GaAs quantum dots with long-wavelength emission
One method which enables the shift of photoluminescence spectra of InAs/GaAs quantum dots toward longer wavelengths is the covering of the dots by In.sub.x./sub.Ga.sub.1-x./sub.As strain reducing ...
Lateral elongation of InAs/GaAs quantum dots studied by magnetophotoluminescence
Křápek, V.; Kuldová, Karla; Oswald, Jiří; Hospodková, Alice; Hulicius, Eduard; Humlíček, J.
2006 - Czech
We have investigated single layer InAs QDs on GaAs substrate grown by MOVPE by means of magnetophotoluminescence up to 24 T. Fitting the field-dependence of band positions, we have found the ratio of lateral sizes within 1.5 –1.7, and the effective mass of 0.04 – 0.05. Zkoumali jsme izolovanou vrstvu InAs kvantových teček na GaAs substrátu připravenou technikou MOVPE pomocí magnetofotoluminiscence v poli do 24 T. Fitováním energiových posunů jsme určili poměr laterálních délek 1.5 – 1.7 a efektivní hmotnost 0.04 – 0.05.
Keywords:
quantum dot; GaAs; InAs; magnetophotoluminescence
Available at various institutes of the ASCR
Lateral elongation of InAs/GaAs quantum dots studied by magnetophotoluminescence
We have investigated single layer InAs QDs on GaAs substrate grown by MOVPE by means of magnetophotoluminescence up to 24 T. Fitting the field-dependence of band positions, we have found the ratio of ...
Glass formation conditions in supercooled molten zinc chloride
Rodová, Miroslava; Kožíšek, Zdeněk; Nitsch, Karel
2006 - Czech
Solidification of ZnCl2 melt was studied experimentally by methods of thermal analysis and theoretically by construction of TTT curves. Tuhnutí taveniny ZnCl2 bylo studováno experimentálně metodami termické analýzy a teoreticky konstrukcí TTT křivek.
Keywords:
thermal analysis; glass formation; TTT curves; molten ZnCl.sub.2./sub. solidification
Available at various institutes of the ASCR
Glass formation conditions in supercooled molten zinc chloride
Solidification of ZnCl2 melt was studied experimentally by methods of thermal analysis and theoretically by construction of TTT curves.
Hardness measurement of inhomogeneous plasma sprayed coatings
Čtvrtlík, Radim; Stranyánek, Martin; Boháč, Petr; Jastrabík, Lubomír; Ctibor, Pavel; Hrabovský, Miroslav
2005 - Czech
This article deals with an examination of mechanical properties of TiO.sub.2./sub. plasma sprayed coatings using nanoindentation method DSI and measuring instrument NanoTest 600 TM. Příspěvek se zabývá vyšetřováním mechanických vlastností plazmových nástřiků TiO.sub.2./sub. nanoindentační metodou DSIprostřednictvím měřícího přístroje NanoTest 600.sup.TM./sup..
Keywords:
nanoindentation; Oliver-Pharr method; plasma sprayed coatings; TiO.sub.2./sub.
Available at various institutes of the ASCR
Hardness measurement of inhomogeneous plasma sprayed coatings
This article deals with an examination of mechanical properties of TiO.sub.2./sub. plasma sprayed coatings using nanoindentation method DSI and measuring instrument NanoTest 600 TM.
Phase analysis using Fourier transform profilometry
Mandát, Dušan; Rössler, T.; Hrabovský, Miroslav
2005 - Czech
The profilometry method used here is the Fourier-Transform Profilometry Method that was originally published by Takeda in 1982. The geometry of the experiment is very similar that used in Moiré Topography, but the advantage of this method is only one image of the projected grating is necessary to produce the resulting object´s fringes. Fourierovská topografie publikovaná v tomto příspěvku pracuje na principu výpočtu změny fáze mezi referenční a objektovou přímkou. Sestava experimentu je podobná moiré topografii. Citlivost Fourierovské profilometrie je vyšší než moiré.
Keywords:
profilometry; Fourier transformation; grating; 3D topography; unwrapping
Available at various institutes of the ASCR
Phase analysis using Fourier transform profilometry
The profilometry method used here is the Fourier-Transform Profilometry Method that was originally published by Takeda in 1982. The geometry of the experiment is very similar that used in Moiré ...
SYSWELD welding simulation
Lapšanská, Hana; Chmelíčková, Hana; Havelková, Martina; Čtvrtlík, Radim
2005 - Czech
This contribution informs about proram SYSWELD.sup.®./sup. 2004 which is used for simulations of some physical and chemical events running in materials during processes connected with heat conduction, especially during welding. Příspěvek seznamuje s programem SYSWELD.sup.®./sup. 2004, s jehož pomocí je možno modelovat některé fyzikální a chemické děje, které probíhají v materiálech při procesech, souvisejících s vedením tepla, konkrétně při svařování.
Keywords:
simulation; welding; thermo-metallurgical and mechanical analysis
Available at various institutes of the ASCR
SYSWELD welding simulation
This contribution informs about proram SYSWELD.sup.®./sup. 2004 which is used for simulations of some physical and chemical events running in materials during processes connected with heat conduction, ...
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