László Nánai - Academia.edu (original) (raw)
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Papers by László Nánai
Quantum Electronics, 2012
Laser-induced chemical liquid phase deposition of copper without a traditional reducing agent has... more Laser-induced chemical liquid phase deposition of copper without a traditional reducing agent has been used for the first time to obtain conductive patterns on a dielectric surface having a reducing ability. It is shown that phenol-formaldehyde binder of the dielectric (glass fibre) can successfully play the role of a reducing agent in this process. The resulting copper sediments have low
The main purpose of this paper is to give a model-based proof of the fact that the effect of vari... more The main purpose of this paper is to give a model-based proof of the fact that the effect of variations of the pressure p in a furnace can be compensated for by an adequate variation of the pulling rate ν in order to assure a constant diameter of a Nd:YAG cylindrical bar, created from the melt by edge-delivered film-fed growth. It is assumed that the bottom line of the melt/gas meniscus on the die is fixed on the outer edge of the die, and the melt temperature T 0 at the meniscus basis is constant. The (ν,p) couples are found for which the system of differential equations, which governs the evolution of the crystal radius r=r(t) and the meniscus height h=h(t), has an asymptotically stable steady/state solution (r * ,h * ). The set of stable growth region in the (p,ν) plane, the dependencies r * =r * (p,ν), h * =h * (p,ν), and the set S of the couples (p,ν) for which r * (p,ν)=r f (where r f represents the desired radius) are determined. Using the curve S, for a given variation of p ...
1st Intl School on Laser Surface Microprocessing, 1990
The question discussed in this paper are related to the formation of different dissipative struct... more The question discussed in this paper are related to the formation of different dissipative structures on the surface of metals (vanadium) and the bulk of semiconductors (vanadium pentoxide). Two dimensional spatial structures of thermal field arised at laser light induced oxidation of metals in both upper and under surfaces are presented. The observed structures are explained in frames of theory of instabilities connected with temperature dependence of surface tension of melted material Benard and Rayleigh like convections due to temperature gradients caused by laser light. 1.
Journal of the Less Common Metals, 1989
Etude experimentale du processus d'oxydation de plaques metalliques de vanadium irradiees par... more Etude experimentale du processus d'oxydation de plaques metalliques de vanadium irradiees par un faisceau laser de 30 W
Infrared Physics, 1989
Various mechanisms are proposed to explain the dynamics of laser light induced titanium combustio... more Various mechanisms are proposed to explain the dynamics of laser light induced titanium combustion. Titanium targets 5 x 120 x 0.5 cu mm in size were irradiated by the nonpolarized radiation of a CW YAG laser at different incident beam angles. The onset of combustion was determined by the point of inflection depending on T(t), where T is temperature and t is time.
Quantum Electronics, 2012
Laser-induced chemical liquid phase deposition of copper without a traditional reducing agent has... more Laser-induced chemical liquid phase deposition of copper without a traditional reducing agent has been used for the first time to obtain conductive patterns on a dielectric surface having a reducing ability. It is shown that phenol-formaldehyde binder of the dielectric (glass fibre) can successfully play the role of a reducing agent in this process. The resulting copper sediments have low
The main purpose of this paper is to give a model-based proof of the fact that the effect of vari... more The main purpose of this paper is to give a model-based proof of the fact that the effect of variations of the pressure p in a furnace can be compensated for by an adequate variation of the pulling rate ν in order to assure a constant diameter of a Nd:YAG cylindrical bar, created from the melt by edge-delivered film-fed growth. It is assumed that the bottom line of the melt/gas meniscus on the die is fixed on the outer edge of the die, and the melt temperature T 0 at the meniscus basis is constant. The (ν,p) couples are found for which the system of differential equations, which governs the evolution of the crystal radius r=r(t) and the meniscus height h=h(t), has an asymptotically stable steady/state solution (r * ,h * ). The set of stable growth region in the (p,ν) plane, the dependencies r * =r * (p,ν), h * =h * (p,ν), and the set S of the couples (p,ν) for which r * (p,ν)=r f (where r f represents the desired radius) are determined. Using the curve S, for a given variation of p ...
1st Intl School on Laser Surface Microprocessing, 1990
The question discussed in this paper are related to the formation of different dissipative struct... more The question discussed in this paper are related to the formation of different dissipative structures on the surface of metals (vanadium) and the bulk of semiconductors (vanadium pentoxide). Two dimensional spatial structures of thermal field arised at laser light induced oxidation of metals in both upper and under surfaces are presented. The observed structures are explained in frames of theory of instabilities connected with temperature dependence of surface tension of melted material Benard and Rayleigh like convections due to temperature gradients caused by laser light. 1.
Journal of the Less Common Metals, 1989
Etude experimentale du processus d'oxydation de plaques metalliques de vanadium irradiees par... more Etude experimentale du processus d'oxydation de plaques metalliques de vanadium irradiees par un faisceau laser de 30 W
Infrared Physics, 1989
Various mechanisms are proposed to explain the dynamics of laser light induced titanium combustio... more Various mechanisms are proposed to explain the dynamics of laser light induced titanium combustion. Titanium targets 5 x 120 x 0.5 cu mm in size were irradiated by the nonpolarized radiation of a CW YAG laser at different incident beam angles. The onset of combustion was determined by the point of inflection depending on T(t), where T is temperature and t is time.