Institute of Physics

Institute of Physics 584 records found  beginprevious565 - 574next  jump to record: Search took 0.00 seconds. 
Laserové řezání CVD diamantových plátků
Chmelíčková, Hana ; Stranyánek, Martin ; Rosa, Jan ; Vaněček, Milan
CVD diamond wafers with diameter 51 mm and thickness from 0,1 mm to 0,7 mm are necessary to cut to different shapes. Cutting technology by means of pulsed Nd:YAG laser was developed to successful dividing of thin pieces
Výsledky mikroanalýz Ni-Cr-si struktur laserových povlaků
Stranyánek, Martin ; Chmelíčková, Hana ; Hrabovský, Miroslav
Studied structures were produced by Ni-based alloy laser cladding on ČSN 411 373 steel using CO.sub.2./sub. laser. Some verification of process parameters and material distribution in clad layer were analysed by SEM
Study on material composition in the layer of coat produced by laser
Stranyánek, Martin
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.
Analysis of abrasion of cotyles
Mandát, Dušan ; Nožka, Libor ; Hrabovský, Miroslav
The 3D optical scanning topography is one possible method of an analysis of the cotyle deformation. The object of this experiment is to quantify the decrease of cotyle material. The scanning object is polyethylene coxa cotyle ABG1.The cotyle is a plastic fossette surounded with metal cage, which is connected with a coxa of the patients. Due to use the deformation of the surface arise.
Digitální projekční moiré topografie se dvěma projektory
Rössler, T. ; Hrabovský, Miroslav ; Pluháček, F.
The double-projector moiré topography is a well-known optical topografic method based on the projection of the shadow or light gratings onto the measured object under various angles. There can be observed except these projected gratings another structure on the record image of result intensity field. Thanks the development of computer techniques it is possible to apply another procedure.
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
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.
The evaluation of the dentine surface by means of SEM & AFM after previous exposure to ND:YAG laser
Zapletalová, Z. ; Peřina st., Jan ; Novotný, R. ; Kubínek, R. ; Chmelíčková, Hana
Dentine senzitivity is a common complaint of pacients in dental offices. They are caused by the opening of dentine tubules. This may be due to enamel or cementum loss or due to the dentine exposure in the area of cementum-enamel junction. A procedure with long-lasting effect seems to be the closure of the exposed dental tubules on the teeth surface by means of CO 2 or ND:YAD laser.
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
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).
Microstructure and phase composition of rapidly solidified Al-Ni-Zr alloys
Verner, J. ; Vojtěch, D. ; Bártová, Barbora ; Gemperle, Antonín ; Studnička, Václav
Aluminium alloys with transition elements prepared by rapid qienchinf methods have tendencies to form nanocrystalline and amorphous structures. These alloys high tensile strength and good stability at higher temperature. Microstructure, phase composition and changes at elevated temperature of AlNi 18.5 and AlNi 17 Zr 1.8 alloys have been investigated in our experimental study.
Vliv RF výboje na růst nanokrystalických diamantových vrstev deponovaných metodou pulsní laserové depozice
Novotný, Michal ; Jelínek, Miroslav ; Bulíř, Jiří ; Lančok, Ján ; Vorlíček, Vladimír ; Michalka, M. ; Popov, C.
In this paper, we report on the growth of NCD films by PLD in pure hydrogen ambient and by HPLD in Ar/H.sub.2./sub. ambient. HPLD systems were based on combination of PLD and addiational RF discharges. The deposited films were studied using Alfastep profilometer, X-ray diffraction, Raman spectroscopy and scanning electron microscopy

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