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Search Results: 1 - 10 of 401282 matches for " M. Radovic "
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Ferromagnet-superconductor proximity effect: The clean limit
M. Bozovic,Z. Radovic
Physics , 2004, DOI: 10.1209/epl/i2004-10511-0
Abstract: We study theoretically the influence of ferromagnetic metals on a superconducting film in the clean limit. Using a self-consistent solution of the Bogoliubov--de Gennes equation for a ferromagnet-superconductor-ferromagnet double junction we calculate the pair potential and conductance spectra as a function of the superconducting layer thickness $d$ for different strengths of ferromagnets and interface transparencies. We find that the pair potential and the critical temperature are weakly perturbed by the exchange interaction and do not drop to zero for any finite $d$. On the other hand, for thin superconducting films charge transport is spin polarized and exhibits a significant dependence on the ferromagnetic strength and magnetization alignment.
Coherent electronic transport through a superconducting film
M. Bozovic,Z. Pajovic,Z. Radovic
Physics , 2002, DOI: 10.1016/S0921-4534(03)00951-1
Abstract: We study coherent quantum transport through a superconducting film connected to normal-metal electrodes. Simple expressions for the differential conductance and the local density of states are obtained in the clean limit and for transparent interfaces. Quasiparticle interference causes periodic vanishing of the Andreev reflection at the energies of geometrical resonances, subgap transport, and gapless superconductivity near the interfaces. Application of the results to spectroscopic measurements of the superconducting gap and the Fermi velocity is analyzed.
Josephson coupling through ferromagnetic heterojunctions with noncollinear magnetizations
Z. Pajovic,M. Bozovic,Z. Radovic,J. Cayssol,A. Buzdin
Physics , 2006, DOI: 10.1103/PhysRevB.74.184509
Abstract: We study the Josephson effect in clean heterojunctions that consist of superconductors connected through two metallic ferromagnets with insulating interfaces. We solve the scattering problem based on the Bogoliubov--de Gennes equation for any relative orientation of in-plane magnetizations, arbitrary transparency of interfaces, and mismatch of Fermi wave vectors. Both spin singlet and triplet superconducting correlations are taken into account, and the Josephson current is calculated as a function of the ferromagnetic layers thicknesses and of the angle $\alpha$ between their magnetizations. We find that the critical Josephson current $I_c$ is a monotonic function of $\alpha$ when the junction is far enough from $0-\pi$ transitions. This holds when ferromagnets are relatively weak. For stronger ferromagnets, variation of $\alpha$ induces switching between 0 and $\pi$ states and $I_c(\alpha)$ is non-monotonic function, displaying characteristic dips at the transitions. However, the non-monotonicity is the effect of a weaker influence of the exchange potential in the case of non-parallel magnetizations. No substantial impact of spin-triplet superconducting correlations on the Josephson current has been found in the clean limit. Experimental control of the critical current and $0-\pi$ transitions by varying the angle between magnetizations is suggested.
D. Radovic
Economics of Development , 2012,
Abstract: The issue of institutional analysis has been in the focus of economic science since 1980 until now. It began as a criticism of old institutionalism, later developed as the neoinstitutional economic theory, an original direction of economic thought, that due to its identical methodology, represents specific (partial) extension of the neoclassical theory. Later a new French institutionalism as a criticism of neoinstitutional economic theory and the neoclassical one-sided and abstract rationality and appropriate treatment of methodoligical individualism appeared. These directions are formaly and conceptualy different, but they have some essential similarities, primarily related to ideological terms. Economy of conventions is one of the modern economic science courses. It is part of a broad intellectual movement, based on discussions of economists, sociologists, historians, psychologists and other social scientific representatives. It is a heterogeneous intellectual movement, trying to overcome the basic principles of neoclassical economics, especially the alleged existence of market equilibrium (which implies an optimal resource allocation and pricing in the conditions of ideal market) as well as rational behavior of economic agents (who optimize their economic activities in order to draw maximum benefit). So, one can say that this is a specific critique of neo-liberal notions of autonomy and even the dominance of economic factors in relation to the impact of social, political and other factors. This paper explains some important elements, indicating that the consensus theory and economy of conventions, despite the indisputable originality, has its role model in neo-institutional economics theory. The relationship between these respectable economic theories, their similarities and disciplinary demarcation lines have been defined. Its hypothesis is that these directions, despite many formal and conceptual differences, have enough similarities to imply the conclusion that neo-institutional economic theory in some parts can be viewed as a role model in relation to the economy of conventions.
In-situ Investigation of the Early Stage of TiO2 epitaxy on (001) SrTiO3
M. Radovic,M. Salluzzo,Z. Ristic,R. Di Capua,N. Lampis,R. Vaglio,F. Miletto Granozio
Physics , 2011, DOI: 10.1063/1.3613637
Abstract: We report on a systematic study of the growth of epitaxial TiO2 films deposited by pulsed laser deposition on Ti-terminated (001) SrTiO3 single crystals. By using in-situ reflection high energy electron diffraction, low energy electron diffraction, x-ray photoemission spectroscopy and scanning probe microscopy, we show that the stabilization of the anatase (001) phase is preceded by the growth of a pseudomorphic Sr-Ti-O intermediate layer, with a thickness between 2 and 4 nm. The data demonstrate that the formation of this phase is related to the activation of long range Sr migration from the substrate to the film. The role of interface Gibbs energy minimization, as a driving force for Sr diffusion, is discussed. Our results enrich the phase diagram of the Sr-Ti-O system under epitaxial strain opening the roudeficient SrTiO phase.
The Impact of the Load Side Parameters on PC Cluster's Harmonics Emission
Advances in Electrical and Computer Engineering , 2011, DOI: 10.4316/aece.2011.01017
Abstract: Harmonics current emission from personal computers (PCs) is of special interest to power quality researchers, due to their wide spread application and the fact that they are usually concentrated in large groups (clusters). The input current total harmonic distortion (THDI) dependence on number of connected PCs in a cluster (NPC) is affected by network parameters and load side parameters of each cluster's PC simultaneously. As the impact of grid parameters on the THDI=f(NPC) dependence is analyzed in the author's previous papers, special emphasis is given on the impact of the DC side smoothing capacitor (C) in PCs power supply unit. For engineering application it is convenient to present the THDI=f(NPC) function with simple mathematical expressions which include these effects. In the paper authors are proposing an improved mathematical expression to presents impact of load side (DC capacitance) parameters. To achieve this goal, results of the measurements of harmonic emission from a large computer center with 167 clustered PCs and the computer simulation for even larger number of PCs are used.
Electrochemistry of active chromium. Part IV. Dissolution of chromium in deaerated sulfuric acid
Journal of the Serbian Chemical Society , 2004,
Abstract: Chromium dissolution in aqueous sulfuric acid solutions in the pH range 0.5 3 was studied electrochemically by the potentiostatic or very slow potentiodynamic method, and by the analyses of the Cr ion concentrations in the electrolyte formed during the experiments. It was shown that the electrochemical anodic dissolution follows a common Tafel line with a slope of ca. 120 mV dec-1, independent of the solution pH and the hydrodynamics, while the passivation potentials and passivation currents were independent on hydrodynamics but strongly dependent on the pH. In parallel with the electrochemical dissolution, a considerable anomalous or chemical Cr dissolution process occurs, as evidenced by the spectrophotometric analyses of the electrolytes for Cr ions after prolonged potentiostating of the electrodes at different potentials, as well as by measuring the electrode weight losses. All these results indicate the existence of a potential independent reaction of Cr dissolution occurring in parallel to the anodic dissolution process. Mechanisms for both the electrochemical and the chemical process are proposed. The consequences of these phenomena on the behavior of some practical systems where chromium or a chromium alloy (e.g., stainless steels) are used are discussed.
Patrones de Discurso Observados en el Aula de Matemática de Segundo Ciclo Básico en Chile
Radovic,Darinka; Preiss,David;
Psykhe (Santiago) , 2010, DOI: 10.4067/S0718-22282010000200007
Abstract: triadic sequences (initiation-response-follow up) are a frequent type of interaction in classrooms in many different countries. this study describes, using a spoken discourse codification system, these sequences in 89 chilean public middle-school level mathematics lessons, chosen at random from 684 classes that were filmed for a national evaluation. triadic sequences were related to teachers' performance scores and lesson activities. the study identified a relatively shared interactional pattern, whose main features were: closed ended questions, low frequency of student participation and low use of metacognitive teacher follow-ups. in addition, when teaching mathematic skills, teachers generated more questions involving application of content, in comparison to other type of questions. teachers that received a higher performance assessment produced a higher number of open-ended questions as well as a higher number of questions about students' personal experiences. the results of this study suggest that increasing the repertoire of teacher discourse is a potential area for teachers' training.
Snezana Stamenovic,Miodrag Radovic
Acta Medica Medianae , 2005,
Abstract: Based on the spectral analysis of Doppler velocity waveform in uteroplacental and fetoplacental circulation, a Doppler parameters diagnostic efficiency was examined in fetus prenatal detection with intrauterine growth restriction (IUGR) within Pregnancy Induced Hypertension (PIH) and their respiratory menace.A prospective analysis was performed in 141 third-trimester pregnancies. The control group included 65 normal pregnancies and the expeimental group included 76 high-risk pregnancies, which was divided into three sub-groups, namely, 31 with IUGR within PIH, 24 with PIH only and 21 with IUGR only. The uterine artery was examined in uteroplacental circulation and umbilical artery was examined in fetoplacental circulation. Perinatal outcome and birth weight were recorded in each case.Uteroplacental circulation analysis showed statistically higer values of Pourcelot resistance index Ri in uterine artery in IUGR within PIH pregnancies. Statistically higher pulsatility index in umbilical artery was recorded in IUGR pregnancies compared to the control group and PIH subgroup. Higher values of pulsatility index were particulary noticed in IUGR within PIH subgroup. Doppler parameters in uteroplacental and fetoplacental circulation showed a significant negative correlation in relation to Apgar score of the newborn.In combination with biophysical profile and CTG, Doppler parameters diagnostic efficiency is increased on the evaluation of the fetus respiratory menace with IUGR and PIH.
Vesna V. Radovic
Acta Medica Medianae , 2008,
Abstract: The approaches in prevention and therapy of acute coronary syndrome (ACS) are different ways of conservative and invasive procedures which have contributed to reduction of mortality of ischemic heart disease (IHD) by 20 %, approximately, in many parts of the world in the recent 20 years. Beta blockers (BB) gave significant contribution to prevention and therapy of ACS, especially their use in ACS and in the first years of secondary prevention of IHD. The aim of the study was the estimation of patients with ACS in Serbia in the period 2000 – 2005, as well as the evaluation of use of BB in ACS and resolving dilemma concerning their prescription.The data about patients were obtained from the National Register for ACS in Serbia. Lately, there has been a marked increase in the number of coronary units (CU) and patients with ACS. In admission diagnoses, there was the largest number of patients with AMI or 69,7 %, with the highest total mortality of 11,7 %. In addition, higher rates of male patients than female ones, as well as an increase of male patients in the age group of 50-59 years, and increase of female patients in the age group of 70-79 years were reported. It is interesting that the rate of female patients is higher than presented in literature. It is noted that the rate of AMI with ST segment elevation (STEMI) is more frequent than AMI without ST elevation (NSTEMI). STEMI is more frequent in younger patients and male ones. Case-fatality of STEMI patients is significantly higher compared with NSTEMI patients (P<0,000). The percentage of patients with ACS treated with BB is still low and it has not been changed significantly in recent years.
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