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Tytuł:
"Necklace-Ring" Beams in Saturable Kerr Media with Square-Root Nonlinearity
Autorzy:
Petrović, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/2047852.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Tg
42.65.Sf
Opis:
Analytical and numerical investigation of the propagation of "necklace-ring" optical beams in Kerr-like saturable photorefractive media with square-root nonlinearity is carried out. Analytic expression for the propagation dynamics of the necklace beams is in good agreement with numerical findings.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 921-925
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Four- and Two-Wave Mixing in Solids
Autorzy:
Suchocki, A.
Gilliland, G. D.
Quarles, G. J.
Petrovic, M. S.
Powell, R. C.
Powiązania:
https://bibliotekanauki.pl/articles/1888054.pdf
Data publikacji:
1991-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Ma
71.35.+z
Opis:
The paper gives an overview of theory and presents several examples of application of some holographic techniques: four-wave mixing, self-scattering and beam coupling to study nonlinear optical properties of solids. Among them excitation energy transfer in chromium-doped vibronic laser materials and picosecond study of undoped CdTe are reported.
Źródło:
Acta Physica Polonica A; 1991, 80, 2; 207-219
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optically-Determined Exciton Transport in GaAs Structures
Autorzy:
Gililand, G. D.
Wolford, D. J
Hjalmarson, H. P
Petrovic, M. S.
Klem, J.
Kuech, T. F.
Northrop, G. A.
Bradley, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/1929606.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.47.+p
72.80.Ey
Opis:
We have used an all-optical photoluminescence-imaging technique to measure excitonic transport in three types of GaAs structures in which the excitonic transitions vary from allowed direct-gap excitons to forbidden, doubly-indirect Type-II excitons. We f nd remarkable differences in the transport properties of these excitons. Our studies show that bulk free-exciton transport exhibits an anomalous laser power-dependent diffusivity, whereas quasi-2D interfacial excitons and Type-II cross-interface excitons do not. Additionally, we observe localization of cross-interface excitons at the potential disorder induced by the heterointerface roughness.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 409-417
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geodynamic investigations in Serbia and Montenegro
Autorzy:
Komatina, M.
Komatina-Petrovic, S.
Powiązania:
https://bibliotekanauki.pl/articles/225139.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geodynamika
sejsmika
Serbia
Czarnogóra
Półwysep Bałkański
geodynamics
seismic
Montenegro
Balkan Peninsula
Źródło:
Reports on Geodesy; 2006, z. 5/80; 437-440
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Characteristics of As₂S₃ Glasses Induced by Doping with Bismuth
Autorzy:
Šiljegović, M.
Lukić-Petrović, S.
Petrović, D.
Videnović, I.
Turyanytsa, I.
Powiązania:
https://bibliotekanauki.pl/articles/1398705.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
62.20.-x
62.20.D-
64.75.Gh
Opis:
This paper presents and discusses the results of the instrumented indentation test of the samples of the system $Bi_{x}(As₂S₃)_{100-x}$, x= 1.5, 3, 5, and 7 at.%. Measurements of mechanical parameters were performed using a Fischerscope HM2000 S nanoindentation device. The experimental data obtained by measuring the microhardness parameters were used to determine some other mechanical quantities that are important for the characterization of the examined materials in terms of their potential applications. For the first three compositions, the results indicated an increase in the microhardness with the increase in the content of doping atoms, which can be interpreted as an enhancement of the strength and stiffness of the structural network. The lower value of microhardness of the sample with the maximum content of Bi can BE associated with the specific structure of this composition. The pronounced indentation size effect was also detected on the indentation curve in the range of smaller loads. According to the model of elastic-plastic deformation, applied for the description of indentation size effect measured for the investigated chalcogenides, the largest value of the elastic recovery was observed for the sample Bi₇(As₂S₃)₉₃. The calculated values of the elasticity modulus show that the glass with x= 5 at.% Bi is characterized with the highest atomic packing density.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 488-491
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex analysis and interpretation
Autorzy:
Stojiljkovic, D.
Komatina-Petrovic, S.
Komatina, M.
Powiązania:
https://bibliotekanauki.pl/articles/225442.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geologia
geomorfologia
geodynamika
Półwysep Bałkański
geology
geomorphology
geodynamics
Balkan Peninsula
Źródło:
Reports on Geodesy; 2006, z. 5/80; 463-472
0867-3179
Pojawia się w:
Reports on Geodesy
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:
A stochastic model for estimation of repair rate for system operating under performance based logistics
Stochastyczny model do szacowania intensywności napraw dla systemu działającego w warunkach logistyki wydajnościowej
Autorzy:
Kontrec, N.
Panić, S.
Petrović, M.
Milošević, H.
Powiązania:
https://bibliotekanauki.pl/articles/301372.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
repair rate
availability
stochastic model
performance based logistics
intensywność napraw
gotowość
model stochastyczny
logistyka oparta na wydajności
Opis:
Performance Based Logistics (PBL) concept has an aim to improve the system availability and it has been extensively researched in the recent years. These researches showed that inventory level does not impact system availability as much as component reliability and repair time in repairable system operating under PBL contract. Based on that, in this paper, we propose a new stochastic model for determination of annual repair rate for critical aircraft components in such system in order to achieve desired availability. The result obtained could be used for planning of base stock level and capacity of repair facilities.
Koncepcja Logistyki Opartej na Wydajności (Performance Based Logistics, PBL), której celem jest poprawa gotowości systemów, została w ostatnich latach szeroko zbadana. Badania te wykazały, że w przypadku systemów działających w warunkach PBL, poziom zapasów nie wpływa na gotowość systemu w tak dużym stopniu jak niezawodność elementów składowych oraz czasy napraw. Opierając się na tej obserwacji, w niniejszym artykule proponujemy nowy model stochastyczny do określania rocznej intensywności napraw krytycznych elementów samolotu tworzących system tego typu. Model ten pozwala na osiągnięcie pożądanej gotowości. Uzyskany model może być wykorzystany do planowania bazowego poziomu zapasów oraz przepustowości zakładów remontowych.
Źródło:
Eksploatacja i Niezawodność; 2018, 20, 1; 68-72
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of X-Ray Diamond Detector by Monte Carlo Method
Autorzy:
Stankovic, S.
Ilic, R.
Davidovic, D.
Petrovic, M.
Powiązania:
https://bibliotekanauki.pl/articles/1808062.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.40.Wk
Opis:
The use of diamond as material for X-ray detector is subject of investigation and practice in radiotherapy, space and material science and technology. This paper presents the results of application of Monte Carlo method for simulation of photon transport through diamond detector. The aim is restitution and demonstrating of numerical technique for characterization of electrical properties for different detector conditions and configurations. Monte Carlo code was adopted to determine the energy deposited and dose distribution in the structure of diamond detector. Our results show that the use of numerical simulations may be of essential help in design of diamond detector systems.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 816-819
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:
Radiation Absorption Characteristics of Titanium Alloys
Autorzy:
Stankovic, S.
Ilic, R.
Davidovic, D.
Petrovic, M.
Tadic, S.
Kovacevic, M.
Powiązania:
https://bibliotekanauki.pl/articles/1808063.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Ap
Opis:
Titanium alloys have found numerous applications in space research, and nuclear industry and research. Since X-rays constitute an important part of the space radiation environment, numerical simulations of radiation absorption characteristics of titanium alloys were studied in this paper. The photon transport Monte Carlo software was used for determining the energy deposited in titanium samples. The numerical results show the pronounced dependence of radiation absorption properties of different combinations of components in alloy. The results obtained are encouraging in respect of optimization of structure of alloys regarding their required features in radiation shielding.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 820-822
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macro- and micro-element composition of Osage orange Maclura pomifera L. (Moraceae)
Autorzy:
Stojiljkovic, M.S.
Petrovic, S.M.
Stojilkovic, S.T.
Savic, S.R.
Todorovic, B.Z.
Powiązania:
https://bibliotekanauki.pl/articles/14905.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Źródło:
Journal of Elementology; 2018, 23, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of As3plus cations from water by activated carbon, bentonite and zeolite in a batch system at different pH
Autorzy:
Todorović, B.Ž
S.T., Stojiljković
D.T., Stojiljković
Petrović, S.M.
Takić, L.M.
Stojiljković, M.S.
Powiązania:
https://bibliotekanauki.pl/articles/1190183.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
adsorption
As3+
activated charcoal
bentonite
zeolite
Opis:
Adsorption of As3+ cations by natural materials is a relatively well-studied problem although much remains to be learned about it. As a consequence of pollution, remarkably high arsenic content has been reported in numerous natural waters. The subject of this paper is the adsorption of As3+ cations by granulated activated carbon (GAC), bentonite and zeolite (0.1-0.3 g), which could be used prospectively as potential supplement to other materials. The quantitative analysis of all samples was performed by Inductively Coupled Plasma-Optical Emission Spectrometry. The results indicate that the amount of As3+ cations in a solution decreases with time for all the three adsorbents. The research also showed that 0.2 g of GAC and bentonite is an optimum adsorbent amount at pH 6.5. The same amount of zeolite has the best adsorption capacity at pH 3.5. Parallel testing of these materials showed that GAC had the highest adsorption potential (50%) compared to bentonite and zeolite (11.7% and 26.5%). Most of the adsorption process by GAC takes place at the first 45 min; in the case of bentonite it is the first 30 min and for zeolites the first 15 min (best starting; 19.5%). The reason for the lower adsorption of As3+ cations by bentonite is its instability in acidic environment, while zeolite shows reduced isomorphic replacement ability due to different charges compared to potentially convertible cations. The adsorption of arsenic on these natural materials has proven to be one of the most efficient and economical method of arsenic removal.
Źródło:
Journal of Elementology; 2017, 22, 2; 713-723
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visual attention pooling and understanding the structural similarity index in multi-scale analysis
Autorzy:
Bondzulic, B. P.
Petrovic, V. S.
Mitrovic, S. T.
Pavlovic, B. Z.
Andric, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/173580.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
image quality assessment
structural similarity index
visual attention pooling
Opis:
We present a novel spatial pooling strategy and the results of an extensive multi-scale analysis of the well-known structural similarity index metric (SSIM) for objective image quality evaluation. We show, in contrast with some previous studies, that even relatively simple perceptual importance pooling strategies can significantly improve objective metric performance evaluated as the correlation with subjective quality assessment. In particular, we define an attention and quality driven pooling mechanism that focuses structural comparisons within the SSIM model to only those pixels exhibiting significant structural degradations. We show that optimal objective metric performance is achieved over very sparse spatial domains indeed that ignore most of the signal data. We also investigate an explicit breakdown of the structural models within SSIM and show that in combination with the proposed attention and quality driven pooling some of these models represent well performing metrics in their own right, when applied at appropriate scale for which there may not be a single optimal value. Our experiments demonstrate that the augmented SSIM metric using the proposed pooling model provides performance advantage on an extensive LIVE dataset covering hundreds of degraded images and 5 different distortion types compared to both conventional SSIM and state-of-the-art objective quality metrics.
Źródło:
Optica Applicata; 2014, 44, 2; 267-283
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of As3plus cations from water by activated carbon, bentonite and zeolite in a batch system at different pH
Autorzy:
Todorović, B. Ž.
Stojiljković, S. T.
Stojiljković, D. T.
Petrović, S. M.
Takić, L. M.
Stojiljković, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/963942.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Adsorption of As3+ cations by natural materials is a relatively well-studied problem although much remains to be learned about it. As a consequence of pollution, remarkably high arsenic content has been reported in numerous natural waters. The subject of this paper is the adsorption of As3+ cations by granulated activated carbon (GAC), bentonite and zeolite (0.1-0.3 g), which could be used prospectively as potential supplement to other materials. The quantitative analysis of all samples was performed by Inductively Coupled Plasma-Optical Emission Spectrometry. The results indicate that the amount of As3+ cations in a solution decreases with time for all the three adsorbents. The research also showed that 0.2 g of GAC and bentonite is an optimum adsorbent amount at pH 6.5. The same amount of zeolite has the best adsorption capacity at pH 3.5. Parallel testing of these materials showed that GAC had the highest adsorption potential (50%) compared to bentonite and zeolite (11.7% and 26.5%). Most of the adsorption process by GAC takes place at the first 45 min; in the case of bentonite it is the first 30 min and for zeolites the first 15 min (best starting; 19.5%). The reason for the lower adsorption of As3+ cations by bentonite is its instability in acidic environment, while zeolite shows reduced isomorphic replacement ability due to different charges compared to potentially convertible cations. The adsorption of arsenic on these natural materials has proven to be one of the most efficient and economical method of arsenic removal.
Źródło:
Journal of Elementology; 2017, 22, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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