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The evaluation of the dentine surface by means of SEM & AFM after previous exposure to Nd:YAG laser
Novotný, R.; Zapletalová, Z.; Kubínek, R.; Chmelíčková, Hana; Peřina st., Jan
2004 - Czech
Dentine sensitivity is a common complaint of patients in dental offices. It is caused by the opening of dentine tubules towards the external environment. One of the procedures that seems to have a longer-lasting effect is the closure of the exposed dentinal tubules on the teeth surface by means of CO 2 laser or Nd:YAG laser. Dentinová senzitivita je běžnou stížností pacientů ve stomatologických ordinacích. Jsou způsobeny otevřením dentinových tubulů do vnějšího prostředí po ztrátě skloviny nebo cementu či při odhalení v oblasti cementosklovinné hranice zubu. Jednou z metod odstraňující bolestivé důsledky je zatavení dentinových kanálků pomocí CO 2 nebo Nd:YAG laseru.
Keywords:
Nd:YAG laser; dentin
Available at various institutes of the ASCR
The evaluation of the dentine surface by means of SEM & AFM after previous exposure to Nd:YAG laser
Dentine sensitivity is a common complaint of patients in dental offices. It is caused by the opening of dentine tubules towards the external environment. One of the procedures that seems to have a ...
Waveguiding ZnO and BaTiO3 thin films fabricated by laser deposition
Jelínek, Miroslav; Kocourek, Tomáš; Mazingue, T.; Escoubas, L.; Flory, F.
2003 - Czech
Various deposition configurations for deposition of large area homogenous films (3x3c 2 ) were studied. High quality ZnO and BaTiO3 films were deposited by KrF laser ablation. Optical properties by method of mode spectroscopy were measured. Byly studovány depoziční konfigurace pro růst tloušt'kové homogenních tenkých vrstev na podložkách o rozměrech až 3cmX3cm. KrF laserovou ablací byly deponovány vysoce kvalitní tenké vrstvy ZnO a BaTiO3 .Jejich optické vlastnosti byly měřeny metodou módové spektroskopie.
Keywords:
thin films; waveguiding films; laser deposition; ZnO; BaTiO 3
Available at various institutes of the ASCR
Waveguiding ZnO and BaTiO3 thin films fabricated by laser deposition
Various deposition configurations for deposition of large area homogenous films (3x3c 2 ) were studied. High quality ZnO and BaTiO3 films were deposited by KrF laser ablation. Optical properties by ...
Image data analysis of 3D topography
Mandát, Dušan; Nožka, Libor; Hrabovský, Miroslav
2003 - Czech
This article is about 3D scanning topography. It is a new optical method that use the detection of laser trace projected on diffuse reflecting surface. Článek pojednává o 3D skenovací topografii. Tato nová optická metoda využívá detekci laserové stopy projektované na difusně odrazný povrch.
Keywords:
topography; profilometry; image analysis; treshold; laser trase; matrix operation; XCAP-Std TM; ISO/IEC 14772-1:1977; VRML
Available at various institutes of the ASCR
Image data analysis of 3D topography
This article is about 3D scanning topography. It is a new optical method that use the detection of laser trace projected on diffuse reflecting surface.
Study on material composition in the layer of coat produced by laser
Stranyánek, Martin
2003 - Czech
The article deals with investigation of layers produced by the laser cladding technology from viewpoint of material changes in treated area. The elements distribution was studied by scannig electron microscopy. Příspěvek se zabývá vyšetřováním vrstev vytvořených pomocí technologie laserového povlakování z pohledu materiálových změn ve zpracovávané oblasti. Zastoupení jednotlivých prvků bylo studováno pomocí rastrovací elektronové mikroskopie.
Keywords:
laser cladding; material composition; Stellit 6
Available at various institutes of the ASCR
Study on material composition in the layer of coat produced by laser
The article deals with investigation of layers produced by the laser cladding technology from viewpoint of material changes in treated area. The elements distribution was studied by scannig electron ...
Deformation of the mirror segments for fluorescent detector in Pierre Auger observatory by its own weight
Pech, Miroslav; Hrabovský, Miroslav; Schovánek, Petr; Palatka, Miroslav; Nožka, Libor; Vlček, Martin; Řídký, Jan; Grygar, Jiří
2003 - Czech
The Pierre Auger fluorescent detectors are optical telescopes, mirror in the each of them is composes of 60 hexagonal ultrathin segments in gravitational field of the Earth are here presented. Fluorescenční detektory v projektu Pierre Auger jsou optické teleskopy, zrcadlo v každém z nich je složeno z 60 hexagonálních segmentů. V této práci jsou prezentovány výsledky simulace deformací těchto segmentů při naklonění vlivem gravitačního pole Země.
Keywords:
Pierre Auger; Fluorescent detector; mirrors deformation
Available at various institutes of the ASCR
Deformation of the mirror segments for fluorescent detector in Pierre Auger observatory by its own weight
The Pierre Auger fluorescent detectors are optical telescopes, mirror in the each of them is composes of 60 hexagonal ultrathin segments in gravitational field of the Earth are here presented.
Measurement of electro-optical properties of quantum-size structures based on InAs/GaAs - photocurrent and electroluminescence
Mačkal, Adam; Hazdra, P.; Hulicius, Eduard; Oswald, Jiří; Pangrác, Jiří; Melichar, Karel; Hospodková, Alice; Šimeček, Tomislav
2003 - Czech
Contribution presents the electroluminescence, photoabsorption and polarization properties of semiconductor lasers with thin strained InAs layers in GaAs at elevated temperatures. The lasers exhibit high optical recombination efficiency, low threshold current density and wide temperature operation range (above 100řC). Měření absorpce a elektroluminiscence polovodičových laserů a struktur s tenkými napnutými InAs vrstvami v GaAs při různých polarizačních teplotách. Lasery vykazují vysokou účinnost a nízkou prahovou proudovou hustotu a mohou pracovat při teplotách vyšších než 100řC.
Keywords:
thin strained quantum well; InAs; GaAs; TE; TM; polarisation; electroluminescence; photoabsorption; elevated temperature
Available at various institutes of the ASCR
Measurement of electro-optical properties of quantum-size structures based on InAs/GaAs - photocurrent and electroluminescence
Contribution presents the electroluminescence, photoabsorption and polarization properties of semiconductor lasers with thin strained InAs layers in GaAs at elevated temperatures. The lasers exhibit ...
Similarity of interference and holographic interferometry with moiré phenomena and possibility of use for modelling
Rössler, T.; Hrabovský, Miroslav
2003 - Czech
The paper is devoted to modeling of two know effects, interference and holographic interferometry using another phenomena, colled the in-plane moiré. Although every method has various physical priciple and the result intensity patterns have various properties the generalized definition of moiré phenomena helps to find out the similarity between them.It is the similarity of shapes of intensity patterns. Článek je věnován modelování dvou neznámých jevů, interference a holografické interferometrie s využitím ostatních jevů, nazvaných moiré vrovině. Ačkoliv každá metoda má různou podstatu a výsledné intenzitní vzory mají různé vlastnosti, obecná definice jevu moiré pomáhá ve vyhledání jejích vzájemné podobnosti mezi tvary intenzitních obrazců.
Keywords:
physical similarity; modelling; in-plane moiré; interference; holographic interferometry
Available at various institutes of the ASCR
Similarity of interference and holographic interferometry with moiré phenomena and possibility of use for modelling
The paper is devoted to modeling of two know effects, interference and holographic interferometry using another phenomena, colled the in-plane moiré. Although every method has various physical ...
3-D optical scanning topography
Nožka, Libor; Mandát, Dušan; Hrabovský, Miroslav
2003 - Czech
This paper refers to the theory of new optical noncontact topographic measurement method of objects with diffuse surface. It uses laser strip made by cylinder lens to iluminate object in quastion. Tento článek pojednává o teorii nové optické bezkontaktní topografické metody měření objektů s difusně odrazným povrchem. K osvětlení daného objektu používá laserovou stopu vytviřenou válcovou čočkou.
Keywords:
topography; moiré; image analysis; trigonometric algorithm; digital imaging
Available at various institutes of the ASCR
3-D optical scanning topography
This paper refers to the theory of new optical noncontact topographic measurement method of objects with diffuse surface. It uses laser strip made by cylinder lens to iluminate object in quastion.
Laser cladding with a numerical modelling of the temperature field in material utilization
Stranyánek, Martin; Chmelíčková, Hana
2003 - Czech
Laser cladding is presented as a one of the technologies of laser material surface treatment. A series of speciments have been treated using CO.sub.2./sub. laser with a maximum output power of 2.5 kW by this technology. Some characteristics and properties such as shape or microhardness of clad layers were analysed. For numerical calculations of the laser induced temperature field in treated material was used the finite difference method. Laserové povlakování představuje jednu z technologií povrchového zpracování kovů laserem.Koninuálním CO.sub.2./sub. laserem s maximálním výstupním výkonem 2.5 kW byla vyrobena řada vzorků, u kterých byla dále analyzována struktura, tvar a mikrotvrdost naplátovaných vrstev. Metodou konečných prvků bylo modelováno teplotní pole v ovlivněném materiálu.
Keywords:
laser cladding; temperature field; finite difference method
Available at various institutes of the ASCR
Laser cladding with a numerical modelling of the temperature field in material utilization
Laser cladding is presented as a one of the technologies of laser material surface treatment. A series of speciments have been treated using CO.sub.2./sub. laser with a maximum output power of 2.5 kW ...
Optical methods in experimental mechanics
Hrabovský, Miroslav
2002 - Czech
The paper deals with experimental methods used in experimental mechanics, especially in experimental stress analysis. High attention is given to optical methods - classical and modern optical methods and its future in mechanics. They are classical interferometry based on optical interference and superposition, stereometry, photoplasticity, moiré, holography speckle photography etc. Tento článek se zabývá experimentálními metodami v experimentální mechanice, zvláště v experimentální analýze napětí. velká pozornost je věnována optickým metodám - klasickým a moderním optickým metodám a jejích budoucnosti v mechanice.Je to klasická interferometrie založená na optické interferenci a superpozici, stereometrie, fotoplasticita, moiré, holografie speklová fotografie atd.
Keywords:
experimental mechanics; experimental stress analysis optical methods; interferometry; holography; holographic interferometry; moiré; speckle
Available at various institutes of the ASCR
Optical methods in experimental mechanics
The paper deals with experimental methods used in experimental mechanics, especially in experimental stress analysis. High attention is given to optical methods - classical and modern optical methods ...
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