Analisamos de maneira qualitativa as propriedades da base de estados do modelo simplético SCM, através de um cálculo em seu submodelo Sp(l,R) que aplicamos à descrição das propriedades espectroscópicas do núcleo 12 ANTPOT C. Através de um cálculo em uma base deformada, mostramos que a necessidade de considerarmos estados de base altamente excitados para descrevermos os observáveis pelo SCM, se devia a uma falta de otimização da base. A base otimizada é dada pela projeção em momento angular de estados de fonons deformados, determinados pelo método da projeção antes da variação. Esses fonons estão relacionados com as ressonâncias gigantes monopolares e quadrupolares. Mostramos que para descrevermos adequadamente as transições eletromagnéticas entre estados pertencentes a representações irredutíveis distintas de Sp(3,R) , era necessário considerar a mistura de representações. Através de um cálculo exploratório, analisamos o efeito dessa mistura nas transições monopolares e quadrupolares entre o estado intruso O IND 2 POT + , que é associado a uma representação prolata de Sp(l,R) e os estados da banda rotacional fundamental, que são associados a uma representação oblata de Sp(l,R). / In this thesis, we present a qualitative analysis of an Sp(l,R) calculation, applied to the description of the spectroscopic properties of 12 ANTPOT C . Based on a calculation in a deformed harmonic oscillator basis, we show that, the need to include highly excited basis states to describe the properties of 12 ANTPOT C, is due to a lack of optimization of the spherical basis. The optimized basis is given by the angular momentum projection of deformed phonon states, determined by the method of variation after projection, where the deformed phonons are associated to giant monopole and quadrupole resonances. We have also shown that, for an adequate description of the electromagnetic transitions between states belonging to different irreducible representations of Sp(3,R), it is necessary to consider mixture of representations. In a preliminary calculation we discuss the effect of this mixture to the monopole and quadrupole transitions between the intruder state 0 IND 2 POT + and the states of the ground rotational band associated, respectively, to a prolate and oblate representations.

From 5.5 months of dual-band optical photometric monitoring at the 1 mmag level, BRITE-Constellation has revealed two simultaneous types of variability in the O4I(n)fp star ζ Puppis: one single periodic non-sinusoidal component superimposed on a stochastic component. The monoperiodic component is the 1.78-d signal previously detected by Coriolis/Solar Mass Ejection Imager, but this time along with a prominent first harmonic. The shape of this signal changes over time, a behaviour that is incompatible with stellar oscillations but consistent with rotational modulation arising from evolving bright surface inhomogeneities. By means of a constrained non-linear light-curve inversion algorithm, we mapped the locations of the bright surface spots and traced their evolution. Our simultaneous ground-based multisite spectroscopic monitoring of the star unveiled cyclical modulation of its He IIλ4686 wind emission line with the 1.78-d rotation period, showing signatures of corotating interaction regions that turn out to be driven by the bright photospheric spots observed by BRITE. Traces of wind clumps are also observed in the He II λ4686 line and are correlated with the amplitudes of the stochastic component of the light variations probed by BRITE at the photosphere, suggesting that the BRITE observations additionally unveiled the photospheric drivers of wind clumps in ζ Pup and that the clumping phenomenon starts at the very base of the wind. The origins of both the bright surface inhomogeneities and the stochastic light variations remain unknown, but a subsurface convective zone might play an important role in the generation of these two types of photospheric variability.

Les études Galactiques nécessitent de grands échantillons d'étoiles dont la masse, l'âge, les abondances, la vitesse et la distance sont connues. Les observations spectroscopiques permettent de mesurer certains de ces paramètres et les autres sont soit déterminés par d'autres moyens, ou dérivés par le calcul. Le besoin d'échantillons statistiquement représentatifs a motivé la construction d'instruments, et la réalisation de grands relevés comme le SDSS, LAMOST et GAIA... Ces projets génèrent une énorme quantité de données que les méthodes d'analyse interactives traditionnelles ne peuvent pas gérer. Cela a motivé des efforts pour concevoir des méthodes automatiques. Mon travail a commencé dans ce contexte, et les objectifs étaient de développer et tester une méthode automatique, puis de l'appliquer à des spectres stellaires à moyenne résolution. La thèse comporte quatre sections : 1. Je présente le package informatique ULySS, et en particulier son application à la détermination des paramètres atmosphériques des étoiles. 2. Nous avons utilisé ULySS pour déterminer les paramètres atmosphériques des 1273 étoiles de la bibliothèque CFLIB. 3. Nous avons appliqué la même méthode sur des observations obtenus pendant la mise en service de LAMOST et nous avons préparé une base de données de spectres de références pour les relevés futurs avec cet instrument. 4. Nous avons cherché des étoiles présumées pauvres en métaux (MP) en se servant des données de vérification scientifique de LAMOST. Cette étude contribue à l'étude des étoiles MP dans la Voie Lactée et montre la faisabilité de ces recherches avec LAMOST et ULySS / Galactic studies require large samples of stars with known mass, age, abundance, spatial velocity and distance etc. Spectroscopic observations allow ones to measure some of these parameters and to derive the others. The need for statistically representative samples motivated the construction of instruments and the realization of large surveys like SDSS, LAMOST and GAIA... These projects bring an enormous quantity of data that the traditional interactive spectral analysis methods cannot handle. This triggered efforts to design automatic methods. My work started in this context, and the goals were to develop and test an automatic method and to apply it to medium resolution stellar spectra. The thesis contains four sections: 1. The ULySS package, and in particular its application to the determination of the atmospheric parameters of stars is presented. 2. We used ULySS to determine the atmospheric parameters of the 1273 stars of the CFLIB library. 3. We applied the same method on LAMOST commissioning observations and we prepared stellar spectral templates for the future surveys. 4. We searched new metal-poor (hearafter MP) stellar candidates from LAMOST commissioning observations. The result of these MP star candidates is a prelude to the feasibility of LAMOST's capability on searching and enlarging the sample of MP stars in the Milky Way

Magnetic Resonance Spectroscopy (MRS) and Spectroscopic Imaging (MRSI) play an emerging role in clinical assessment, providing in vivo estimation of disease markers while being non-invasive and applicable to a large range of tissues. However, static magnetic field inhomogeneity, as well as eddy currents in the acquisition hardware, cause important distortions in the lineshape of acquired NMR spectra, possibly inducing significant bias in the estimation of metabolite concentrations. In the post-acquisition stage, this is classically handled through the use of pre-processing methods to correct the dataset lineshape, or through the introduction of more complex analytical model functions. This thesis concentrates on handling arbitrary lineshape distortions in the case of quantitation methods that use a metabolite basis-set as prior knowledge. Current approaches are assessed, and a novel approach is proposed, based on adapting the basis-set lineshape to the measured signal.Assuming a common lineshape to all spectral components, a new method is derived and implemented, featuring time domain local regression (LOWESS) filtering. Validation is performed on synthetic signals as well as on in vitro phantom data. Finally, a completely new approach to MRS quantitation is proposed, centred on the use of the compact spectral support of the estimated common lineshape. The new metabolite estimators are tested alone, as well as coupled with the more common residual-sum-of-squares MLE estimator, significantly reducing quantitation bias for high signal-to-noise ratio data.

Der Förster-Resonanzenergietransfer (FRET) liefert einen wichtigen Beitrag bei der Untersuchung kleinskaliger biologischer Systeme und Prozesse. Möglich wird dies durch die r-6-Abhängigkeit des FRET, die es erlaubt Abstände und strukturelle Änderungen weit unterhalb der Beugungsgrenze des Lichts mit hoher Sensitivität und geringem Aufwand zu bestimmen. Die besonderen photophysikalischen Eigenschaften von Terbiumkomplexen (LTC) und Quantenpunkten (QD) machen sie zu geeigneten Kandidaten für hochsensitive und störungsarme Multiplex-Abstandsmessungen in biologischen Systemen und Prozessen. Die Abstandsbestimmungen setzen jedoch eine genaueste Kenntnis des Mechanismus des Energietransfers von LTC auf QD ebenso voraus, wie das Wissen um Größe und Gestalt letzterer. Quantenpunkte haben im Vergleich zu biologischen Strukturen ähnliche Dimensionen und können nicht als punktförmig betrachtet werden, wie es bei einfacheren Farbstoffen möglich ist. Durch ihre Form kommt es zu einer Abstandsverteilung innerhalb des Donor-Akzeptorsystems. Dies beeinflusst den Energietransfer und damit die experimentellen Ergebnisse. In dieser Arbeit wurde der Energietransfer von LTC auf QD untersucht, um zu einer Aussage hinsichtlich des Mechanismus der Energieübertragung und der dabei zu berücksichtigenden photophysikalischen und strukturellen Parameter von LTC und QD zu gelangen. Mit der Annahme einer Abstandsverteilung sollten die Größen der Quantenpunkte bestimmt und der Einfluss von Form und Gestalt auf den Energietransfer betrachtet werden. Die notwendigen theoretischen und praktischen Grundlagen wurden eingangs dargestellt. Daran schlossen sich Messungen zur photophysikalischen Charakterisierung der Donoren und Akzeptoren an, die Grundlage der Berechnung der FRET-Parameter waren. Die Förster-Radien zeigten die für den FRET von LTC auf QD typischen extrem hohen Werte von bis zu 11 nm. Zeitaufgelöste Messungen der FRET-induzierten Lumineszenz der Donoren und Akzeptoren in den beiden biomolekularen Modellsystemen Zink-Histidin und Biotin-Streptavidin beschlossen den praktischen Teil. Als Donor wurde Lumi4Tb gebunden an ein Peptid bzw. Streptavidin genutzt, Akzeptoren waren fünf verschiedene, kommerziell erhältliche Quantenpunkte mit Carboxyl- bzw. Biotinfunktionalisierung. Bei allen Donor-Akzeptor-Paarungen konnte FRET beobachtet und ausgewertet werden. Es konnte gezeigt werden, dass die gesamte Emission des Terbiums zum Energietransfer beiträgt und der Orientierungsfaktor ² den Wert 2/3 annimmt. Die Charakterisierung der Bindungsverhältnisse innerhalb der FRET-Paare von LTC und QD über Verteilungsfunktionen bietet über die Form der Verteilungskurve die Möglichkeit Aussagen über die Gestalt der FRET-Partner zu treffen. So war es möglich, die mittlere Form der Quantenpunkte als Sphäre zu bestimmen. Dies entsprach, insbesondere bei den in z-Richtung des Kristallgitters elongierten Quantenpunkten, nicht den Erwartungen. Dieser Befund ermöglicht daher bei zukünftigen Messungen eine Verbesserung der Genauigkeit bei Abstandsbestimmungen mit Quantenpunkten. Neben der Ermittlung der die FRET-Verteilung bestimmenden Gestalt der Quantenpunkte konnte im Rahmen dieser Arbeit anhand vergleichender Messungen die Dicke der Polymerhülle der QD bestimmt und so gezeigt werden, dass FRET-Paare aus lumineszenten Terbiumkomplexen und Quantenpunkten in der Lage sind, Abstände im Nano- bis Sub-Nanometerbereich aufzulösen. / Förster resonance energy transfer (FRET) plays an important role in the study of small-scale biological systems and processes. This is made possible by the r-6-dependence of FRET, which allows for determination of distances and structural changes far below the diffraction limit of light with high sensitivity and low costs. The unique photophysical properties of terbium complexes (LTC) and quantum dots (QDs) make them suitable candidates for high-sensitivity, low-noise multiplex distance measurements in biological systems and processes. Estimating distances with these FRET-pairs requires a precise knowledge of the mechanism of energy transfer from LTC to QD as well as the knowledge of size and shape of the latter. Quantum dots have, compared to biological structures, similar dimensions and therefore can not be considered as point-like, as it is possible with smaller dyes. Due to their shape, there is a distance distribution within the donor-acceptor system. This influences the energy transfer and hence the experimental results. In this work, the energy transfer from LTC to QD was examined to come to a conclusion regarding the mechanism of energy transfer and the photophysical and structural parameters of LTC and QD to be considered. The adoption of a FRET-distance distribution due to a size distribution of quantum dots should yield to a size estimation of the nanoparticles as well as a conclusion of the influence of shape and form on energy transfer. The necessary theoretical and practical principles were described at the outset of this work. This description of the basic concepts was followed by the photophysical characterization of the donors and acceptors and the calculation of FRET parameters. The calculated Förster radii were typical for the FRET from LTC to QD and showed extremely high values of up to 11 nm. Time-resolved measurements of the FRET-induced luminescence of donors and acceptors in two biomolecular model binding systems namely zinc-histidine and biotin-streptavidin binding rounded the practical part. FRET-donors used were commercially available Lumi4Tb complexes bound to streptavidin or a peptide, respectively. As FRET-acceptors five different commercially available quantum dots with carboxyl- or biotin-functionalisation were used. For all donor-acceptor pairs FRET could be observed and evaluated. It could be shown that the whole emission of terbium contributes to energy transfer. Furthermore the orientation factor ² was estimated to have a value of 2/3 when using LTC as FRET-donors and QD as FRET-acceptors. The characterization of the bonding within the FRET pairs of LTC and QD with distribution functions allows for statements about the shape of the FRET partners via shape of the distribution curves. It was possible to determine the average shape of the quantum dots as a sphere. This outcome was, especially for (in z-direction of the crystal lattice) elongated quantum dots, in the contrary to the expectations. This finding therefore allows for improving the accuracy of distance determinations with quantum dots. Based on comparative measurements it was also possible to determine the thickness of the polymer shell of the QD demonstrating that FRET pairs of luminescent terbium complexes and quantum dots are capable of determining distances in the nanometer to sub-nanometer range.

The evolutionary paths of the massive O and B type stars are often defined by angular momentum transformations that involve circumstellar gas disks. This circumstellar gas is revealed in several kinds of observations, and here I describe a series of investigations of the hydrogen line emission from such disk using detailed studies of five massive binaries and a survey of 128 Be stars. By examining three sets of spectra of the active mass-transfer binary system RY Scuti, I determined masses of 7.1 +/- 1.2 M_sun for the bright supergiant and 30.0 +/- 2.1 M_sun for the massive companion that is hidden by an accretion torus. I also present a cartoon model of the complex mass flows in the system. Using optical spectroscopy and X-ray flux data, I investigated the mass transfer processes in four massive X-ray binaries (a massive B star with mass flowing onto a compact, neutron star companion). The B-supergiant system LS I +65 010 transfers mass via stellar winds. I find the X-ray flux modulates with the orbital period. In the other three X-ray binary systems (LS I +61 303, HDE 245770, and X Persei), an outflowing circumstellar disk is responsible for the mass transfer, and in all three systems, the disk appears to be truncated by gravitational interactions with the compact companion. The disk in the microquasar system LS I +61 303 is limited in radius by the periastron separation and an increase in both H-alpha equivalent width and X-ray flux following periastron may be due to a density wave in the disk induced by tidal forces. Observations of HDE 245770 document what appears to be the regeneration of a circumstellar disk. The disk of X Persei appears to have grown to near record proportions and the X-ray flux has dramatically increased. Tidal interaction may generate a spiral density wave in the disk and cause an increase in H-alpha equivalent width and mass transfer to the compact companion. During the course of the analysis of the X-ray binaries, I developed numerical models for estimating the size of the Be star disks using just the H-alpha equivalent width. Finally, I present the results of a three year spectroscopic survey of both the H-alpha and H-gamma regions of 128 Be stars. I find that the median fractional variation in the equivalent width of the disk emission lines is 15% over a two year period. I also find that two-thirds of the sample displays evidence of Fe II emission or absorption resulting from surrounding circumstellar material. Many candidates for non-radial pulsation and binary systems are also found. Spectra and notes for all of the sample stars are presented in an appendix.

Disertacijos objektas yra žmogaus širdies laidžiosios sistemos ir kitų širdies audinių morfologinių skirtumų tyrimas spektroskopiniais, histocheminiais ir proteominiais metodais. Disertacijoje pateikti žmogaus širdies laidžiosios sistemos ir kitų širdies audinių palyginamieji spektroskopiniai ir proteominiai tyrimai parodė aiškius struktūrinius šių audinių skirtumus. Baltymų elektroforezės metodu rasta baltymų grupė aptinkama tik širdies laidžiosios sistemos audinyje. Darbe konstatuojama, kad rasti fluorescenciniai ir baltyminės sudėties skirtumai tarp žmogaus širdies laidžiosios sistemos ir miokardo audinių leidžia manyti, kad bioelektrinio impulso sklidimo greičių skirtumus sąlygoja ne tik ląstelių išsidėstymas, skersmuo, bet ir specifiniai morfologiniai skirtumai. Pasinaudojus nustatytais morfologiniais skirtumais galima sukurti žmogaus širdies laidžiosios sistemos vaizdinimo metodiką, kuri leistų nustatyti širdies laidžiosios sistemos anatomines ypatybes. / The theme covered in the dissertation is about investigation of the morphological differences of the conduction system of the human heart and those of other heart tissues, applying spectroscopic, histochemical and proteomic methods. The described spectroscopical and proteomic investigations of the human heart conduction system and other heart tissues in the dissertation indicate clear structural differences between these tissues. Electrophoresis shows protein groups which may be detected only in a conduction system tissue. The dissertation concludes that estimated fluorescence and proteomic differences between His bundle and myocardium tissues may allow us to suggest that distinction of the bioelectrical impulse velocity in these tissues is determined by the specific morphological odds. According to these differences it is possible to create the visualization method of the conduction system.

The theme covered in the dissertation is about investigation of the morphological differences of the conduction system of the human heart and those of other heart tissues, applying spectroscopic, histochemical and proteomic methods. The described spectroscopical and proteomic investigations of the human heart conduction system and other heart tissues in the dissertation indicate clear structural differences between these tissues. Electrophoresis shows protein groups which may be detected only in a conduction system tissue. The dissertation concludes that estimated fluorescence and proteomic differences between His bundle and myocardium tissues may allow us to suggest that distinction of the bioelectrical impulse velocity in these tissues is determined by the specific morphological odds. According to these differences it is possible to create the visualization method of the conduction system. / Disertacijos objektas yra žmogaus širdies laidžiosios sistemos ir kitų širdies audinių morfologinių skirtumų tyrimas spektroskopiniais, histocheminiais ir proteominiais metodais. Disertacijoje pateikti žmogaus širdies laidžiosios sistemos ir kitų širdies audinių palyginamieji spektroskopiniai ir proteominiai tyrimai parodė aiškius struktūrinius šių audinių skirtumus. Baltymų elektroforezės metodu rasta baltymų grupė aptinkama tik širdies laidžiosios sistemos audinyje. Darbe konstatuojama, kad rasti fluorescenciniai ir baltyminės sudėties skirtumai tarp žmogaus širdies laidžiosios sistemos ir miokardo audinių leidžia manyti, kad bioelektrinio impulso sklidimo greičių skirtumus sąlygoja ne tik ląstelių išsidėstymas, skersmuo, bet ir specifiniai morfologiniai skirtumai. Pasinaudojus nustatytais morfologiniais skirtumais galima sukurti žmogaus širdies laidžiosios sistemos vaizdinimo metodiką, kuri leistų nustatyti širdies laidžiosios sistemos anatomines ypatybes.

Pagrindinis disertacijos tikslas – optinio ZnMgRE (RE = Y, Ho, Er) kvazikristalų atsako tyrimais atskleisti jų elektroninės posistemės ypatumus. Disertaciją sudaro eksperimentiniai rentgeno-difrakciniai (XRD) ir optiniai spektroskopiniai tyrimai, kvazikristalų elektroninės posistemės modelio konstravimas ir teorinis jų optinio atsako aprašymas. Atliktais eksperimentiniais XRD tyrimais buvo siekiama atskleisti kvazikristalų atvirkštinės gardelės vektorius, apibrėžiančius potencinį kvazikristalinį lauką, veikiantį į elektroninę posistemę. Optiniai spektroskopiniai tyrimai buvo atlikti kombinuotu spektroskopinės elipsometrijos ir atspindžio spektroskopijos metodu, paremtu darbe pasiūlyta inkaro lango duomenų analizės schema. Naudotas spektroskopinių tyrimų metodas įgalino atskleisti patikimus ZnMgRE optinio laidumo spektrus plačioje, 0.01 – 6 eV, spektrinėje srityje. Darbe išplėstas ZnMgRE elektronų posistemės modelis, kuris anksčiau buvo pasiūlytas kvazikristalų fotoemisinio atsako analizei. Nepriklausomų Fermi paviršiaus sankirtų su Bragg’ų plokštumomis schema formuluota išplėstiniame juostiniame atvaizdavime. Teorinė optinio laidumo skaičiavimų schema, anksčiau pasiūlyta kristalinių junginių optinio laidumo skaičiavimams, šiame darbe išplėsta įskaitant įvairias Fermi lygmens padėtis pseudotarpo atžvilgiu. Teoriniai ZnMgRE optinio laidumo skaičiavimai, atlikti darbe pasiūlyto elektroninės posistemės modelio rėmuose, detaliai atkartoja eksperimentinius optinio laidumo spektrus... [toliau žr. visą tekstą] / The main goal of the dissertation was to reveal the electronic structure of ZnMgRE (RE = Y, Ho, Er) quasicrystals by investigations of their optical response. The thesis comprises experimental X-ray diffraction (XRD) and optical spectroscopy studies of the quasicrystals, a construction of their electron subsystem model, and a theoretical description of their optical response. The XRD studies were carried out to determine the reciprocal quasicrystalline lattice vectors, which define the atomic potential field acting on an electron subsystem. The optical spectroscopy studies were carried out by the combined spectroscopic ellipsometry and reflectance spectroscopy technique, based on a suggested anchor-window method. High-accuracy ZnMgRE optical conductivity spectra were recorded in the wide, 0.01 – 6 eV, spectral range. The model of ZnMgRE electron energy spectrum, previously suggested for an interpretation of experimental ZnMgRE photoemission spectra, was developed. The nearly-free-electron gas model of independent intersections was formulated in the extended zone presentation. A scheme of the theoretical optical conductivity calculations was extended to account for various positions of the Fermi level with respect to a pseudogap. The experimental ZnMgRE optical conductivity spectra can be reproduced in detail by theoretical calculations performed within the framework of the suggested electron energy spectrum model. The set of the electron energy spectrum parameters determined... [to full text]

The main goal of the dissertation was to reveal the electronic structure of ZnMgRE (RE = Y, Ho, Er) quasicrystals by investigations of their optical response. The thesis comprises experimental X-ray diffraction (XRD) and optical spectroscopy studies of the quasicrystals, a construction of their electron subsystem model, and a theoretical description of their optical response. The XRD studies were carried out to determine the reciprocal quasicrystalline lattice vectors, which define the atomic potential field acting on an electron subsystem. The optical spectroscopy studies were carried out by the combined spectroscopic ellipsometry and reflectance spectroscopy technique, based on a suggested anchor-window method. High-accuracy ZnMgRE optical conductivity spectra were recorded in the wide, 0.01 – 6 eV, spectral range. The model of ZnMgRE electron energy spectrum, previously suggested for an interpretation of experimental ZnMgRE photoemission spectra, was developed. The nearly-free-electron gas model of independent intersections was formulated in the extended zone presentation. A scheme of the theoretical optical conductivity calculations was extended to account for various positions of the Fermi level with respect to a pseudogap. The experimental ZnMgRE optical conductivity spectra can be reproduced in detail by theoretical calculations performed within the framework of the suggested electron energy spectrum model. The set of the electron energy spectrum parameters determined... [to full text] / Pagrindinis disertacijos tikslas – optinio ZnMgRE (RE = Y, Ho, Er) kvazikristalų atsako tyrimais atskleisti jų elektroninės posistemės ypatumus. Disertaciją sudaro eksperimentiniai rentgeno-difrakciniai (XRD) ir optiniai spektroskopiniai tyrimai, kvazikristalų elektroninės posistemės modelio konstravimas ir teorinis jų optinio atsako aprašymas. Atliktais eksperimentiniais XRD tyrimais buvo siekiama atskleisti kvazikristalų atvirkštinės gardelės vektorius, apibrėžiančius potencinį kvazikristalinį lauką, veikiantį į elektroninę posistemę. Optiniai spektroskopiniai tyrimai buvo atlikti kombinuotu spektroskopinės elipsometrijos ir atspindžio spektroskopijos metodu, paremtu darbe pasiūlyta inkaro lango duomenų analizės schema. Naudotas spektroskopinių tyrimų metodas įgalino atskleisti patikimus ZnMgRE optinio laidumo spektrus plačioje, 0.01 – 6 eV, spektrinėje srityje. Darbe išplėstas ZnMgRE elektronų posistemės modelis, kuris anksčiau buvo pasiūlytas kvazikristalų fotoemisinio atsako analizei. Nepriklausomų Fermi paviršiaus sankirtų su Bragg’ų plokštumomis schema formuluota išplėstiniame juostiniame atvaizdavime. Teorinė optinio laidumo skaičiavimų schema, anksčiau pasiūlyta kristalinių junginių optinio laidumo skaičiavimams, šiame darbe išplėsta įskaitant įvairias Fermi lygmens padėtis pseudotarpo atžvilgiu. Teoriniai ZnMgRE optinio laidumo skaičiavimai, atlikti darbe pasiūlyto elektroninės posistemės modelio rėmuose, detaliai atkartoja eksperimentinius optinio laidumo spektrus... [toliau žr. visą tekstą]