http://dspace.nbuv.gov.ua:80/handle/123456789/114445 Fri, 17 Apr 2026 05:02:00 GMT 2026-04-17T05:02:00Z http://dspace.nbuv.gov.ua:80/bitstream/id/340883/ http://dspace.nbuv.gov.ua:80/handle/123456789/114445 http://dspace.nbuv.gov.ua:80/handle/123456789/121157 Spectral parameters of electron in multi-shell open semiconductor nanotube Makhanets, O.M.; Kuchak, А.І.; Gutsul, V.I.; Voitsekhivska, O.M. The spectral parameters (resonance energies and resonance widths) of electron in multi-shell open cylindrical semiconductor nanotube are theoretically investigated within the effective mass and rectangular potentials model by using the S-matrix approach. These parameters as functions of the nanotube thickness and axial quasimomentum are analyzed for the nanostructure composed of GaAs and AlxGa₁₋xAs semiconductors Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121157 2015-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121155 Electronic structure of PbSnS₃ and PbGeS₃ semiconductor compounds with the mixed cation coordination Bletskan, M.M.; Bletskan, D.I.; Kabatsii, V.M. The self-consistent band structure calculation of PbSnS₃ and PbGeS₃ ternary compounds with the mixed cation coordination was performed using the ab initio density functional theory method. It has been found that both compounds are indirect-gap semiconductors. The calculated band-gap widths are Egi = 0.75 eV for PbSnS₃ and Egi = 1.96 eV for PbGeS₃. It was performed the analysis of partial contributions to the total density of electronic states, which allowed to identify the genetic nature of valence and conduction bands. The feature of the structure of occupied energy bands in these compounds is the presence of isolated quasi-core d-band of lead atoms and the contribution of Pb6s-states of lone-electron pair to the top of valence band as well as to the second occupied subband. The electron density maps in the different planes have been analyzed. They clearly demonstrate presence of covalent-ionic bond character within the infinite chains and ribbons with prevailing charge concentration on Ge–S, Sn–S, Pb–S bonds, and a weak van der Waals bond component with participation of lone-electron pair of lead between layers as well as ribbons. Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121155 2015-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121154 Fluorescent Mueller-matrix polarimetry of biological tissues in differentiation of benign and malignant tumors Ushenko, Yu.O.; Lakusta, I.I.; Olar, O.I.; Novakovska, O.Yu. The work is aimed at investigation of diagnostic efficiency provided by a new azimuthally stable Mueller-matrix method for analyzing laser fluorescence coordinate distributions characterizing biological tissue histological sections. A new model of generalized optical anisotropy of biological tissues containing protein networks has been proposed in order to ascertain the processes of laser autofluorescence. The influence of complex mechanisms of both phase anisotropy (linear birefringence and optical activity) and linear (circular) dichroism was taken into account. The interrelations between the azimuthally stable Mueller-matrix elements characterizing laser autofluorescence and different mechanisms of optical anisotropy have been determined. The statistic analysis of coordinate distributions of these Mueller-matrix rotation invariants has been offered. Thereupon the quantitative criteria (statistic moments of the 1st to 4th orders) of differentiation of histological sections of uterus wall tumor – group 1 (dysplasia) and group 2 (adenocarcinoma) have been estimated. Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121154 2015-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121152 Mueller-matrix reconstruction of parameters of phase and amplitude anisotropy in diagnostics of endometriosis and infertility Ushenko, A.G.; Dominikov, M.M.; Lakusta, I.I.; Koval, G.D. A new azimuthally stable polarimetric method for processing microscopic images of optically anisotropic structures for different biological layers of histological sections has been proposed. A new model that enables to determine phase anisotropy of biological tissues by using superposition of Mueller matrices of linear birefringence and optical activity has been proposed. The matrix element M₄₄ has been chosen as the main information parameter, which value is independent of rotation angle of both sample and probing beam polarization plane. Thu, 01 Jan 2015 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121152 2015-01-01T00:00:00Z