Browsing by Author "Ašmontas, Steponas"
Now showing items 1-20 of 156
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3D Vector electric field distributions and dispersion characteristics of open rectangular and circular metamaterial waveguides
Gric, Tatjana; Ašmontas, Steponas; Nickelson, Liudmila (18th international conference on microwave, radar and wireless communications (MIKON-2010). 4th Microwave and radar week (MRW-2010). Vilnius, Lithuania, June 14-16, 2010 : conference proceedings. Vol. 2, 2010)Here we present the 3D vector electric field distributions of the main and the first higher modes propagating in the open metamaterial rod and hollow-core waveguides. -
A method for measuring the specific electrical conductivity of an anisotropically conductive medium
Ašmontas, Steponas; Kleiza, Jonas; Kleiza, Vytautas (Acta Physica Polonica A, 2008)The paper deals with the ways of finding an electrical conductivity tensor of a plane and anisotropically conductive sample. Application of the Van der Pauw method to investigate the conductivity of anisotropically conductive ... -
Absorption dependencies of dipolar glass cylindrical waveguide coated by SiC on temperatures and coated layer thicknesses
Nickelson, Liudmila; Bubnelis, Artūras; Ašmontas, Steponas (PIERS Proceedings: Progress In Electromagnetics Research Symposium, Moscow, Russia, August 19-23, 2012, 2012)We have electrodynamically rigorously investigated the open (without metal screen) layered dipolar glass-silicon carbide (SiC) waveguides. Our electrodynamical modeling was carried out by the partial area method with using ... -
Absorption dependencies of dipolar glass cylindrical waveguide coated by SiC on temperatures and coated layer thicknesses
Nickelson, Liudmila; Bubnelis, Artūras; Ašmontas, Steponas (PIERS proceedings, 2012)We have electrodynamically rigorously investigated the open (wihout metal screen) layered dipolar glass-silicon carbide (SiC) waveguides. Our electrodynamical modeling was carried out by the partial area method with using ... -
Absorption dependencies of dipolar glass cylindrical waveguide coated by SiC on temperatures and coated layer thicknesses
Nickelson, Liudmila; Bubnelis, Artūras; Ašmontas, Steponas (Progress in electromagnetics research symposium (PIERS 2012), Moscow, Russia, August 19-23, 2012 : program, 2012) -
Analyses of the gyroelectric plasma rod waveguide
Nickelson, Liudmila; Gric, Tatjana; Ašmontas, Steponas; Martavičius, Romanas (IEEE International Pulsed Power Conference (PPC 2009) Washington, DC, USA, 28 June-2 July 2009, 2010)Semiconductor rod waveguides are widely used in the large variety of devices. Scientists and engineers have been investigating circular cylindrical waveguides for many years due to their excellent electrodynamical ... -
Analyses of the gyroelectric plasma rod waveguide
Nickelson, Liudmila; Gric, Tatjana; Ašmontas, Steponas; Martavičius, Romanas (Pulse pover conference, 2009)Semiconductor rod waveguides are widely used in the large variety of devices. Scientists and engineers have been investigating circular cylindrical waveguides for many years due to their excellent electrodynamical ... -
Analyses of the gyroelectric plasma rod waveguide
Ašmontas, Steponas; Nickelson, Liudmila; Gric, Tatjana; Martavičius, Romanas (17th IEEE international pulsed power conference : June 28 - July 2, 2009, Washington, DC, [USA] : IEEE conference record - abstracts, 2009) -
Analysis of slow and fast modes of lossy ceramic SiC waveguides
Nickelson, Liudmila; Ašmontas, Steponas; Gric, Tatjana; Martavičius, Romanas (Progress in electromagnetics research symposium : Moscow, Russia, August 18-21, 2009 : program, 2009) -
Analysis of slow and fast modes of lossy ceramic SiC waveguides
Nickelson, Liudmila; Ašmontas, Steponas; Gric, Tatjana; Martavičius, Romanas (Progress in electromagnetics research symposium : Moscow, Russia, August 18-21, 2009 : proceedings, 2009)Here we are going to present an electrodynamical analysis of the rectangular and circular SiC rod waveguides. Two computational algorithms in this work were used. The first algorithm, intended for calculating" the square ... -
Analysis of the pulse-modulated microwave propagation into 3D anisotropic heart model by SIE method
Nickelson, Liudmila; Ašmontas, Steponas; Martavičius, Romanas; Engelson, Vadim (PIERS online, 2009)Here we present the electrodynamical analyses of microwave pulses propagation in a 3D anisotropic heart model for the first time. The electrodynamical rigorous solution of Maxwell's equations related to the microwave pulse ... -
Analysis of the pulse-modulated microwave propagation into 3D anisotropic heart model by SIE method
Nickelson, Liudmila; Ašmontas, Steponas; Martavičius, Romanas; Engelson, Vadim (PIERS proceedings, 2009)Here we present the electrodynamical analyses of microwave pulses propagation in a 3D anisotropic heart model for the first time. The electrodynamical rigorous solution of Maxwell's equations related to the microwave pulse ... -
Analysis of the pulse-modulated microwave propagation into a 3D anisotropic heart model by SIE method
Nickelson, Liudmila; Ašmontas, Steponas; Martavičius, Romanas; Engelson, Vadim (Progress in electromagnetics research symposium : Moscow, Russia, August 18-21, 2009 : program, 2009) -
Applicable damage of high-Tc YbaCuO superconducting tapes by current and laser pulses
Kiprijanovič, Oleg; Ašmontas, Steponas; Anisimovas, Fiodoras; Gradauskas, Jonas (Acta Physica Polonica A. 14th International Symposium on Ultrafast Phenomena in Semiconductors. Vilnius, Lithuania, August 23-25, 2010, 2011)Damage and irreversible damage of YBaCuO tapes with high density current after switching from superconducting to normal state are investigated. Quasi-homogeneous current distribution across the tape in superconducting state ... -
Atvirieji cilindriniai girotropiniai bangolaidžiai
Nickelson, Liudmila; Ašmontas, Steponas; Mališauskas, Vacius; Šugurovas, Viktoras (2007) -
Bangolaidžio, pagaminto iš metamedžiagos, kurios efektinės dielektrinė ir magnetinė skvarbos artimos nuliui, dispersinės charakteristikos
Bubnelis, Artūras; Nickelson, Liudmila; Ašmontas, Steponas (39-oji Lietuvos nacionalinė fizikos konferencija, skirta Rutherfordo atomo modelio 100 metų jubiliejui paminėti : Vilnius, 2011 m. spalio 6-8 d. : programa ir pranešimų tezės, 2011) -
Bangolaidžio, pagaminto iš metamedžiagos, kurios efektinės dielektrinė ir magnetinė skvarbos artimos nuliui, dispersinės chrarakteristikos = Dispersion characteristics of waveguide made of metamaterial with the effective permittivity and permeability near to zero
Bubnelis, Artūras; Nickelson, Liudmila; Ašmontas, Steponas (39-oji Lietuvos nacionalinė fizikos konferencija: programa ir pranešimų tezės, 2011 m. spalio 6-8 d, 2011) -
CO2 laser induced hot carrier photoeffect HgCdTe
Ašmontas, Steponas; Gradauskas, Jonas; Seliuta, Dalius; Sužiedėlis, Algirdas; Širmulis, E.; Valušis, Gintaras; Tetyorkin, V.V. (11th International Symposium on Ultrafast Phenomena in Semiconductors Vilnius, Lithuania, Aug 27-29, 2001, 2002)We present the first experimental evidence of fast hot carrier photosignal over HgCdTe p-n junction induced by high intensity CO2 laser pulses. The signal polarity is opposite to that of an ordinary photovoltaic emf. The ... -
CO2 laser radiation detection in compensated germanium
Bumelienė, Skaidra; Ašmontas, Steponas; Gradauskas, Jonas; Jukna, Artūras; Paršeliūnas, Jonas; Seliuta, Dalius; Sužiedėlis, Algirdas; Valušis, Gintaras (Proceedings of SPIE: Nonresonant laser-matter interaction (NLMI-10), 21-23 August 2000, St. Petersburg-Pushkin, Russia, 2001)We report the results of experimental study of infrared radiation detection in a bulk of compensated germanium. Au or Ni with deep levels in the forbidden energy gap was used as compensating impurities. In spite of great ... -
CO2 lazerio spinduliutės detektavimas PbTe-Ni kontaktais
Ašmontas, Steponas; Dashevsky, Z.; Gradauskas, Jonas; Seliuta, Dalius; Sužiedėlis, Algirdas; Valušis, Gintaras (Taikomoji fizika : konferencijos pranešimų medžiaga, Kauno technologijos universitetas, 2000 m. balandžio 13, 2000)We report on results of experimental study of photoresponse induced by CO2 laser light pulses in n-type and p-type lead telluride with Ni contacts. We show that in the case of ohmic contacts the detected signal originates ...