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Wyszukujesz frazę "Jovanović, Ð." wg kryterium: Autor


Wyświetlanie 1-13 z 13
Tytuł:
Optical Properties of the (3,12,12) Hexagonal Archimedean Photonic Crystal
Autorzy:
Jovanović, Ð.
Gajić, R.
Hingerl, K.
Powiązania:
https://bibliotekanauki.pl/articles/1795628.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
61.50.Ah
41.20.Jb
42.25.Bs
42.25.Gy
Opis:
We present a theoretical research of the optical properties of the (3,12,12) hexagonal 2D Archimedean photonic crystals. The structures are made of GaAs dielectric rods in air. Our research is mainly focused on analyzing symmetry properties of the modes and the appearance of the uncoupled modes which strongly affects the propagation of the wave and the optical performances of the material.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 642-644
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Injury risk to young car drivers in traffic on territory of Republic of Serbia
Ryzyko szkody dla młodych kierowców w ruchu drogowym na terytorium Republiki Serbii
Autorzy:
Jovanović, D.
Bašić, S.
Mitrović, J.
Powiązania:
https://bibliotekanauki.pl/articles/374757.pdf
Data publikacji:
2010
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
młody kierowca
ryzyko wypadku
wypadek drogowy
szkoda
young driver
accident risk
road accident
injury
Opis:
Percentage of young drivers who were involved in traffic accident with fatalities and injuries is very high. In nearly each fourth accident with fatalities was participated one driver younger than 25 years. Young drivers take part in 26% of all accident with serious consequences (died and serious injuries). In the paper we prepared analysis of casualty among the young car drivers 18-24 years old who participated in traffic on the territory of the Republic of Serbia during the period of 2002. to 2006. According to collected data of casualties we carried out analysis by time and type of accident in which young car drivers were involved. The main aim is to give some traffic safety measures to reduce the accident risks of young car drivers on the road in Serbia.
Źródło:
Transport Problems; 2010, 5, 2; 21-30
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waveguiding Effect in GaAs 2D Hexagonal Photonic Crystal Tiling
Autorzy:
Jovanović, Ð.
Gajić, R.
Djokić, D.
Hingerl, K.
Powiązania:
https://bibliotekanauki.pl/articles/1807811.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Bs
42.70.Qs
42.82.Et
Opis:
In this paper we theoretically study (with plane wave expansion and finite-difference time-domain models) waveguiding effect of the 2D hexagonal dielectric photonic crystal tiling. The structure is made of GaAs dielectric rods in air. We perform the calculations of the band structures, equi-frequency contours and electromagnetic propagation through the new type of the photonic crystal and self-collimation waveguides making it possible for application.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 55-57
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Application οf Al,Fe-Pillared Clays
Autorzy:
Banković, P.
Milutinović-Nikolić, A.
Jović-Jovičić, N.
Dostanić, J.
Čupić, Ž.
Lončarević, D.
Jovanović, D.
Powiązania:
https://bibliotekanauki.pl/articles/1808061.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.C-
61.43.Gt
61.46.-w
68.43.-h
82.65.+r
Opis:
Al,Fe-pillared clay was synthesized from domestic clay from Bogovina according to a common procedure: grinding, sieving, Na exchange, pillaring, drying and calcination. Two synthesized samples differing only in calcining conditions were prepared. Phase composition and textural properties of the starting clay and synthesized pillared clays were characterized using X-ray diffraction and physisorption of nitrogen. Catalytic tests were performed using sample with better textural properties being the one submitted to milder calcining conditions. Catalytic wet peroxide oxidative degradation of aromatic compounds phenol and tartrazine on the synthesized catalyst was confirmed showing better efficiency in the case of tartrazine.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 811-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Adsorptive Properties οf Organobentonites
Autorzy:
Jović-Jovičić, N.
Milutinović-Nikolić, A.
Banković, P.
Dojčinović, B.
Nedić, B.
Gržetić, I.
Jovanović, D.
Powiązania:
https://bibliotekanauki.pl/articles/1538150.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Ea
61.05.cp
68.43.-h
78.40.-q
82.65.-r
Opis:
In this paper partial and complete substitution of cations in the interlayer region of clay with different amounts of two aliphatic ammonium cations was performed with aim of synthesis of organobentonites with multipurpose adsorption properties. Domestic clay from Bogovina was submitted according to a common procedure used for the obtention of organobentonite, which comprises the following steps: grinding, sieving, Na-exchange, cation exchange and drying. The samples were characterized by X-ray diffraction and infrared spectroscopy. The incorporation of surfactant molecules into smectite structure lead to constant increase of $d_{001}$ basal spacing. IR absorption bands assigned to methyl and methylene vibrations increased with the increase of surfactant/bentonite ratio and length of aliphatic chain in surfactant molecules. Adsorptive properties of the obtained materials were in accordance with their organophylicity: the adsorption of organic dye increased while the rate of removal of $Pb^{2+}$ by adsorption decreased.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 849-854
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carrier Dynamics in Quantum Cascade Lasers
Autorzy:
Harrison, P.
Indjin, D.
Jovanović, V. D.
Mirčetić, A.
Ikonić, Z.
Kelsall, R. W.
McTavish, J.
Savić, I.
Vukmirović, N.
Milanović, V.
Powiązania:
https://bibliotekanauki.pl/articles/2041634.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.60.-v
Opis:
A fully quantum-mechanical model for carrier scattering transport in semiconductor intersubband devices was applied to modelling of carrier dynamics in quantum cascade lasers. The standard model uses the envelope function and effective mass approximations to solve electron band structure under an applied bias. The k·p model has been employed in p-type systems where the more complex band structure requires it. The resulting wave functions are then used to evaluate all relevant carrier-phonon, carrier-carrier and alloy scattering rates from each quantised state to all others within the same and the neighbouring period. This piece of information is then used to construct a rate equation for the equilibrium carrier density in each subband and this set of coupled rate equations are solved self-consistently to obtain the carrier density in each eigenstate. The latter is a fundamental description of the device and can be used to calculate the current density and gain as a function of the applied bias and temperature, which in turn yields the threshold current and expected temperature dependence of the device characteristics. A recent extension which includes a further iteration of an energy balance equation also yields the electron (or hole) temperature over the subbands. This paper will review the method and describe its application to mid-infrared and terahertz, GaAs, GaN, and SiGe cascade laser designs.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 75-81
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normal Incidence Mid-Infrared Photocurrent in AlGaN/GaN Quantum Well Infrared Photodetectors
Autorzy:
Sherliker, B.
Halsall, M. P.
Harrison, P.
Jovanović, V. D.
Indjin, D.
Ikonić, Z.
Parbrook, P. J.
Whitehead, M. A.
Wang, T.
Buckle, P. D.
Phillips, J.
Carder, D.
Powiązania:
https://bibliotekanauki.pl/articles/2041680.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
Opis:
We report the growth and characterization of AlGaN/GaN multiple quantum well structures designed to have intersubband transitions in the mid-infrared region of the spectrum. The samples were nominally undoped but were found to contain a high electron population in the wells induced by the local polarization fields. The sample was characterized by the use of the Raman spectroscopy and photocurrent spectroscopy. The Raman spectroscopy shows electronic Raman scattering from intersubband transitions in the AlGaN/GaN quantum wells. The e$\text{}_{1}$-e$\text{}_{2}$ and e$\text{}_{1}$-e$\text{}_{3}$ transitions of the confined 2d electron population in the wells can clearly be observed. A sample designed to absorb at 4μm was fabricated into mesa structures and the vertical photocurrent measured under normal incidence illumination from the free-electron laser FELIX. A wavelength and bias dependent photocurrent was observed in the mid-IR region of spectrum. The peak responsivity was of the order of 50μA/W at 4 K, the photocurrent still being measurable at room temperature.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 174-178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gaussian-Induced Rotation in Triangular Photonic Lattices
Autorzy:
Jović, D.
Prvanović, S.
Jovanović, R.
Petrović, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047884.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Tg
42.65.Sf
Opis:
Time-dependent rotation of counterpropagating mutually incoherent self-trapped Gaussian beams in periodic optically induced fixed photonic lattices is numerically investigated. Rotation occurs for some values of control parameters. For parameters of such rotation, the solitonic solutions are found using modified Petviashvili's method. It is shown that they correspond to the lowest values of propagation constant in the power diagrams and relation between observed rotation and less confined discrete solitonic solutions are demonstrated.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1067-1072
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Counterpropagating Matter Waves in Optical Lattices
Autorzy:
Prvanović, S.
Jović, D.
Jovanović, R.
Strinić, A.
Belić, M.
Powiązania:
https://bibliotekanauki.pl/articles/1791206.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.75.Lm
Opis:
An investigation of Bose-Einstein condensate in two-dimensional optical lattice potentials, formed by laser beams, is carried out. We are interested in the dynamics of Bose-Einstein condensate in a square optical lattice, where the periodic potential can lead to the stabilization of an otherwise unstable Bose-Einstein condensate. The behavior of Bose-Einstein condensate in optical lattices is described by the nonlinear Gross-Pitaevskii equation, which we treat numerically. By applying the Petviashvili iteration method, we demonstrate the existence of solitonic solutions in the case of counterpropagating matter waves, and analyze their stability.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 507-509
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dancing Light: Counterpropagating Beams in Photorefractive Crystals
Autorzy:
Belić, M.
Petrović, M.
Jović, D.
Strinić, A.
Arsenović, D.
Prvanović, S.
Jovanović, R.
Petrović, N.
Powiązania:
https://bibliotekanauki.pl/articles/1814046.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Tg
42.65.Sf
Opis:
A review of work on the dynamical behavior of counterpropagating incoherent laser beams in photorefractive crystals is presented. Numerical study of counterpropagating beams of different type is carried out, in both space and time, using an appropriate theoretical model. The development of patterns in broad hyper-Gaussian counterpropagating beams in saturable Kerr-like media is investigated, by varying the width of beams. Rotational properties of counterpropagating mutually incoherent self-trapped vortex beams in optically induced fixed photonic lattices are also investigated numerically. One of the fundamental quantum mechanical phenomena is observed for the counterpropagating beams in photonic lattices, the tunneling of light from the first to the higher-order bands of the lattice band gap spectrum. The transfer of angular momentum from vortex beams to optically induced photonic lattices is also demonstrated. For the interacting beams it is found that the sum of angular momenta of counterpropagating components is not a conserved quantity, but the difference is. In the fixed lattices there is always a considerable loss of angular momentum.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 729-736
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intrastriatal pre-treatment with L-NAME protects rats from diquat neurotoxcity
Autorzy:
Djukic, M.
Jovanovic, M.
Ninkovic, M.
Stevanovic, I.
Curcic, M.
Topic, A.
Vujanovic, D.
Djurdjevic, D.
Powiązania:
https://bibliotekanauki.pl/articles/51686.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The choice of high gradient magnetic separation processes for removal of Fe2O3 carriers from quartz raw material
Wybór procesów separacji magnetycznej wysokogradientowej do usuwania nośników Fe2O3 z surowca kwarcowego
Autorzy:
Sekulic, Z.
Bartulovic, Z.
Mihajlovic, S.
Ignjatovic, M.
Savic, L.
Jovanovic, V.
Nisic, D.
Powiązania:
https://bibliotekanauki.pl/articles/216606.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
quartz raw material
mineral impurities
preparation process
high gradient separation
magnetic separation
surowiec kwarcowy
zanieczyszczenia surowca
proces wzbogacania
separacja wysokogradientowa
separacja magnetyczna
Opis:
This review article surveys the subject of choice of high gradient magnetic separation processes for removal of Fe2O3 carriers from quartz raw material by electromagnetic separator with magnetic field intensity of 1.4 T. The review is based on current experience of authors during research phase, as well as project development phase and initial operation of facilities in several locations. Quartz mineral raw material in those locations appeared as sandstone or as loose material. In addition to that, quartz raw material from those locations contained various impurities, i.e. Fe2O3 carriers. The choice of this process for Fe2O3 removal depended on mineralogical composition, shape and the content of minerals, and Fe2O3 removal rate after this process was from 29 to 65%. Magnetic separation is magnetic induction of 1.4 T. It is applied on commercial assortments which were previously subjected to washing and classification processes. It is always the assortment which has to have the lowest Fe2O3 content. The choice of „dry“ or „wet“ magnetic separation (with water flush) also depends on the fact whether this desired assortment is intended for market as dry or wet, as well as on the composition of magnetic impurities. In most cases, the process applied is the wet one.
W artykule dokonano przeglądu badań nad zastosowaniem procesów separacji magnetycznej wysokogradientowej w celu usunięcia nośników Fe2O3 z surowca kwarcowego z a pomocą separatora elektromagnetycznego o natężeniu pola magnetycznego wynoszącego 1,4 T. Przegląd opiera się na aktualnym doświadczeniu autorów podczas fazy badań, a także fazy planowania projektu i początkowej eksploatacji obiektów w kilku miejscach. Kwarcowy surowiec mineralny w tych miejscach występował jako piaskowiec lub luzem. Poza tym surowiec kwarcowy z tych miejsc zawierał różne zanieczyszczenia, np. nośniki Fe2O3. Wybór tego procesu w celu usunięcia Fe2O3 zależał od składu mineralogicznego, kształtu i zawartości minerałów, a stopień usuwania Fe2O3 w tym procesie wynosił od 29 do 65%. Separacja magnetyczna jest indukcją magnetyczną o natężeniu pola 1,4 T. Stosuje się ją do handlowych asortymentów, które były wcześniej poddawane procesom przemywania i klasyfikacji. Zawsze jest to asortyment, który musi mieć najniższą zawartość Fe2O3. Wybór „suchej” lub „mokrej” separacji magnetycznej (z płukaniem wodą) zależy również od tego, czy pożądany asortyment jest przeznaczony do sprzedaży na sucho czy na mokro, a także od składu zanieczyszczeń magnetycznych. W większości przypadków stosowany jest proces mokry.
Źródło:
Gospodarka Surowcami Mineralnymi; 2017, 33, 4; 93-106
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for assessment of the occupational exposure at working places of different TENORM industrial branches
Metody oceny ekspozycji zawodowej powodowanej przez TENORM w różnych gałęziach przemysłu
Autorzy:
Weiss, D.
Biesold, H.
Jovanovic, P.
Juhasz, L.
Laciok, A.
Leopold, K.
Michalik, B.
Moravanska, H.
Poffijn, A.
Popescu, M.
Radulescu, C.
Szerbin, P.
Wiegand, J.
Powiązania:
https://bibliotekanauki.pl/articles/340204.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
BHP
TENORM
projekt TENORMHARM
ochrona radiologiczna
OSH
TENORMHARM project
radiological protection
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 60-61
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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