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Tytuł:
Vlasov Launcher Diagrammatic Design Using the RT Method
Autorzy:
Francik, Andrzej
Jaworski, Grzegorz
Nowak, Maciej
Nowak, Kacper
Powiązania:
https://bibliotekanauki.pl/articles/1839339.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
gyrotron output
ray tracing
Vlasov launcher
Opis:
In this paper, a simple and fast method relied upon for designing a Vlasov launcher with a helical cut is proposed. The method is based on graphic interpretation of analytical relationships that link wave parameters (EM field mode) to the launcher’s geometrical dimensions. Using the ray tracing method, a simplified graphic analysis may be carried out. The results obtained are not significantly different from those of rigorous full-wave analyzes. The family of normalized curves that is created in the process greatly facilitates the stage of optimizing the geometrical parameters of the Vlasov launcher.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 2; 57-67
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sea-bed scattering and reflection contributions to the short-range acoustic impulse response: measurements and modelling
Autorzy:
Ivansson, S.
Karlsson, P. A.
Powiązania:
https://bibliotekanauki.pl/articles/332485.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
ray-tracing
bistatic reverberation
beam-forming
Opis:
A short-range experiment in shallow water has been performed to assess the various contributions to the impulse response. A sound source emitted pulses, centered at 25 kHz, that were registered by an array some 50 m away. The impulse response recordings show initial isolated peaks, followed by long decaying spiky tails. A 3-D ray model, Rev3D, was used to model the measured time traces. The initial peaks were identified as direct and multi-path propagation arrivals, while the decaying tails arise from bistatic reverberation involving the bottom and the sea surface in an elliptical area, with the source and receiver positions as focal points. Beam-forming with the receiver array was applied to locate the parts of the bottom with the most significant contributions to the impulse response, and to suggest an improved reflection-coefficient as well as scattering-kernel values. Rev3D modelling with energy-density maps for selected time intervals, and time traces for energy-weighted averages of various parameters, such as the arrival angles at the array, was also applied for this purpose.
Źródło:
Hydroacoustics; 2016, 19; 153-164
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on a square Cassegrain-type solar concentrating reflector with a double pyramid
Autorzy:
Zhang, Y.
Yang, H.
Jiang, P.
Mao, S.
Yu, M.
Powiązania:
https://bibliotekanauki.pl/articles/174264.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
concentrating reflector
double pyramidal
ray tracing
Opis:
A structure of a solar concentrating reflector is designed in this paper to improve the usage of solar energy. For the dark image which is the result of the secondary mirror in the new type of the Cassegrain solar concentrating system, a double pyramid system is used to improve this phenomenon. By eliminating the dark image, the system enhanced the concentration ratio and the working efficiency. Meanwhile, both the primary and secondary mirrors are shaped into a square section in order to get a better match with a square photovoltaic receiver. While the length of the primary mirror is 89m and the block ratio is 20%, the concentration ratio is equal to 118.86.
Źródło:
Optica Applicata; 2016, 46, 3; 461-471
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation heat transfer model using Monte Carlo ray tracing method on hierarchical ortho-Cartesian meshes and non-uniform rational basis spline surfaces for description of boundaries
Autorzy:
Kuczyński, P.
Białecki, R.
Powiązania:
https://bibliotekanauki.pl/articles/240072.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radiation heat transfer
Monte Carlo
ray tracing
NURBS surfaces
radiacyjna wymiana ciepła
metoda śledzenia promieni
powierzchnia NURBS
Opis:
The paper deals with a solution of radiation heat transfer problems in enclosures filled with nonparticipating medium using ray tracing on hierarchical ortho-Cartesian meshes. The idea behind the approach is that radiative heat transfer problems can be solved on much coarser grids than their counterparts from computational fluid dynamics (CFD). The resulting code is designed as an add-on to OpenFOAM, an open-source CFD program. Ortho-Cartesian mesh involving boundary elements is created based upon CFD mesh. Parametric non-uniform rational basis spline (NURBS) surfaces are used to define boundaries of the enclosure, allowing for dealing with domains of complex shapes. Algorithm for determining random, uniformly distributed locations of rays leaving NURBS surfaces is described. The paper presents results of test cases assuming gray diffusive walls. In the current version of the model the radiation is not absorbed within gases. However, the ultimate aim of the work is to upgrade the functionality of the model, to problems in absorbing, emitting and scattering medium projecting iteratively the results of radiative analysis on CFD mesh and CFD solution on radiative mesh.
Źródło:
Archives of Thermodynamics; 2014, 35, 2; 65-92
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radary SuperDARN : narzędzie do badania i monitorowania atmosfery Ziemi i przestrzeni wokółziemskiej
SuperDARN radars : a tool for testing and monitoring Earth’s atmosphere and near-earth space
Autorzy:
Góral, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/163945.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwa Geofizyczne
Tematy:
International Reference Ionosphere
jonosfera
radar HF
rozpraszanie koherentne
ray tracing
SuperDARN
coherent scattering
HF radar
ionosphere
Opis:
Radary SuperDARN powstały jako narzędzie do badań górnych warstw atmosfery i ich związków z magnetosferą i wiatrem słonecznym (Greenwald i in. 1995; Chisham i in. 2007; Lester 2008, 2013). Pracują w zakresie częstotliwości HF, pomiędzy 8 a 20 MHz. Ich zasada działania opiera się na wykorzystaniu rozpraszania Bragga na periodycznych strukturach przestrzennych o skalach odległości porównywalnych z długością fali sondującej. Radary te umożliwiają obserwacje formacji jonosferycznych zorientowanych wzdłuż linii pola geomagnetycznego. W artykule opisano podstawowe bloki funkcjonalne przykładowego radaru SuperDARN: tor nadawczy, odbiorczy oraz system antenowy. Omówiony został sposób modelowania wiązki sondującej. Jedną z kluczowych kwestii przy wyborze lokalizacji dla nowopowstającej stacji SuperDARN jest określenie jej potencjalnych możliwości obserwacyjnych. Można wykorzystać do tego oprogramowanie dokonujące śledzenia dróg propagacji impulsu emitowanego przez radar i określania punktów, w których wektor fali jest prostopadły do lokalnego pola magnetycznego Ziemi. Warunek taki pozwoli na uzyskanie rozproszenia wyemitowanej przez antenę radaru fali z powrotem, w kierunku nadawania. W artykule przedstawiono wyniki symulacji dla hipotetycznej stacji SuperDARN, zlokalizowanej w południowo-zachodniej Polsce. W obliczeniach użyto programu do ray tracingu, bazującego na algorytmie Jones i Stephenson (1975) oraz modelu jonosfery IRI-2012.
SuperDARN radars were developed as a tool for testing the upper atmosphere regions and their coupling with the magnetosphere and solar wind (Greenwald et al. 1995; Chisham et al. 2007; Lester 2008, 2013). They work in the HF frequency range, between 8 and 20MHz. Their principle of operation is based on the use of Bragg scattering on periodic spatial structures with scales of distance comparable to the length of the sounding wave. These radars allow observation of ionospheric formations oriented along the geomagnetic field lines. The article describes basic functional SuperDARN radar blocks: transmitting path, receiving path, and the antenna system as well. The method of modeling the sounding beam is also presented. One of the key issues when choosing a location for a new SuperDARN station is to determine its potential for observation. You can use a special software to track the propagation paths of the pulse emitted by the radar and determining points in which the wave vector is perpendicular to the local geomagnetic field. Such a condition will allow to obtain the scatter of the wave emitted by the radar antenna back into the direc¬tion of transmission. The article presents simulation results for a hypothetical SuperDARN station, located in south-western Poland. The calculation were based on a ray tracing program based on the Jones and Stephenson algorithm (Jones, Stephenson 1975) and the IRI-2012 ionosphere model.
Źródło:
Przegląd Geofizyczny; 2019, 3-4; 253-265
0033-2135
Pojawia się w:
Przegląd Geofizyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagation prediction for indoor wireless local area network application
Autorzy:
Sharoun, A. O.
Artimei, E. E.
Powiązania:
https://bibliotekanauki.pl/articles/378307.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
indoor WLAN
ray tracing by using
VPL
Opis:
The application of wireless local area network (WLAN) is increasing in offices, it becomes important to study signal propagation indoor environment. In this Paper, the Site Ware Technologies` site specific propagation prediction tool is a Three-dimensional (3-D) ray tracing code employing modified shoot and bounce Ray (SBR) method known as the Vertical Plane Launch (VPL) is used to predict indoor propagation effects in a cultural Center. The simulation experiment is carried out to select the best location for installing a transmitter in a large center with many rooms and corridors. Receivers should available in all of the rooms. To understand how electromagnetic waves reach the receiver, visualization software was used based on Matlab. This type of simulation will save money by selecting the minimum power of a single transmitter and choosing the least number of transmitters in large buildings.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 84; 85-91
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Per-pixel extrusion mapping with correct silhouette
Autorzy:
Chahdi, Adnane Ouazzani
Ragragui, Anouar
Halli, Akram
Satori, Khalid
Powiązania:
https://bibliotekanauki.pl/articles/2097961.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
image-based rendering
real-time rendering
texture mapping
per-pixel extrusion mapping
ray-tracing
silhouette
Opis:
Per-pixel extrusion mapping consists of creating a virtual geometry that is stored in a texture over a polygon model without increasing its density. There are four types of extrusion mapping; namely, basic extrusion, outward extru sion, beveled extrusion, and chamfered extrusion. These different techniques produce satisfactory results in the case of plane surfaces; however, when it is about curved surfaces, a silhouette is not visible at the edges of the extruded forms on the 3D surface geometry, as they not take the curvatures of the 3D meshes into account. In this paper, we present an improvement that consists of using curved ray-tracing to correct the silhouette problem by combining per-pixel extrusion-mapping techniques with a quadratic approximation that is computed at each vertex of a 3D mesh.
Źródło:
Computer Science; 2021, 22 (3); 403-428
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallel implementation of ray tracing procedure in anisotropic medium
Autorzy:
Pieta, A.
Dwornik, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933984.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska
Tematy:
ray tracing
seismic anisotropy
domain decomposition
Opis:
This article describes a parallel implementation of a ray tracing algorithm in a heterogeneous anisotropic geological medium. The shortest path method, which was used for calculations, can give ray path and travel time of seismic wave propagation even for a random and discontinuous velocity field. The high precision required in such calculations was obtained by employing a dense computational grid. This led to a significant increase in the computational effort of the algorithm. The procedure was parallelized using domain decomposition. The results show that the parallel performance of the ray tracing procedure strongly depends on the assumed geological method and differs between media with and without anisotropy of seismic wave propagation.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2012, 16, 1-2; 135-143
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opracowanie symulatora echosondy wielowiązkowej
Development of a simulator of multibeam echosounder
Autorzy:
Maleika, W.
Pałczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/209931.pdf
Data publikacji:
2011
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
numeryczny model terenu (DTM)
echosonda wielowiązkowa
metoda śledzenia promieni
digital terrain model (DTM)
multibeam echosounder
ray tracing
Opis:
W artykule uzasadniono potrzebę stworzenia programowego symulatora echosondy wielowiązkowej oraz symulowania wirtualnych sondaży morskich. Przedstawiono opracowany algorytm działania symulatora oraz wirtualnych pomiarów uwzględniających parametry ruchu jednostki oraz przetwornika. Zaproponowana metoda może być wartościowym narzędziem badawczym w obszarze metod tworzenia DTM oraz w optymalizacji rzeczywistych prac hydrograficznych.
The paper deals with the process of building digital terrain model (DTM) of a seabed basing on multibeam echosounder data. One of the most difficult problems in this area is verification of existing interpolation methods using real data, since the exact shape of the bottom is uncertain. Authors propose introducing the simulation of the hydrographic survey over the high resolution DTM in order to obtain a set of virtual points which can be the source for creating terrain models using different interpolation methods. Such a procedure gives a powerful research tool due to the possibility of simple comparison of the resulting and source terrain models. The algorithm of virtual survey is based on the ray tracing method. Input data consist of the source DTM, description of vessel movement and the echosounder parameters. During each virtual ping, every beam is represented as a ray, which is traced according to sound wave propagation trajectory in order to find an intersection with the terrain model. The coordinates of intersection points are stored as the output of the method. Described algorithm was implemented and the first attempt of its verification is described in the paper. The basis of the research was the set of real data aquired by multibeam echosounder. The high resolution DTM was calculated, the vessel movement and echosounder parameters were obtained as well, then virtual survey was performed. The matter of the research was the spatial distribition of virtual survey points. The results show a similarity of distributions of real and simulated points, including the number of points, distances between them and a beam width. The method introduced in the paper can be powerful verification tool in the area of DTM calculation methods. It will be also useful for the research of the impact of hydrographic survey parameters on the accuracy of resulting digital terrain model.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 3; 215-225
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical methods in underwater acoustics - sound propagation and backscattering
Autorzy:
Nolte, B.
Ehrlich, J.
Hofmann, H.-G.
Schäfer, I.
Schäfke, A.
Stoltenberg, A.
Burgschweiger, R.
Powiązania:
https://bibliotekanauki.pl/articles/331712.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
stochastic ray tracing
German Navy
Opis:
This report summarizes an overview given at the XXXII Symposium on Hydroacoustics (SHA 2015) over several modelling techniques that are used in the context of military applications at the Research Department FWG of the German Bundeswehr Technical Centre for Ships and Naval Weapons, Maritime Technology and Research (WTD 71). For the modelling and understanding of sound propagation a physical model consisting of a tank for scaled measurements and the corresponding numerical simulation is presented. The basic formalism of stochastic ray tracing of the German Navy sonar simulation MOCASSIN is explained and compared to traditional deterministic ray tracing including the comparison with measurements. Strategies for the approximate calculation of the sonar target strength of large underwater objects with the use of boundary element methods, fast multipole methods and a ray-based algorithm are presented and the results of the calculations of several test objects are shown.
Źródło:
Hydroacoustics; 2015, 18; 127-140
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Tracing Algorithm vs Remcom Wireless InSite
Autorzy:
Gotszald, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/963894.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ray Tracing
radio wave propagation modelling
Opis:
Results of comparison between a popular commercial software for radio wave propagation modeling versus prototype implementation of a novel algorithm proposed by the author of this paper is discussed. It is shown that both algorithms lead to very similar results while the new one is faster by a few orders of magnitude.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 3; 273-279
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo simulation of SiO2 nanoparticle-coated polymer optical fiber humidity sensor by ray tracing
Autorzy:
Kovacevic, Milan S.
Milosevic, Marko M.
Kuzmanovic, Ljubica
Djordjevich, Alexandar
Powiązania:
https://bibliotekanauki.pl/articles/1835775.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical fiber
humidity
ray propagation
ray tracing
Opis:
A fiber optic device sensitive to humidity is detailed and modelled by ray tracing based on Monte Carlo simulation. The device is intended primarily for monitoring humidity in the microenvironment of wounds without removing the wound dressing and thus disturbing the wound-healing process. To produce the sensor, cladding is removed from a segment of its polymer-fiber and mesoporous SiO2 nanoparticles are deposited in the exposed zone. This introduces an additional light-transmission loss. The extent of such loss is related to the relative humidity of the environment. Such a relationship, embodying the essence of the sensor’s modulation principle, is examined in this paper by ray tracing based on Monte Carlo simulation. The sensor is explained in detail and its performance is characterised.
Źródło:
Optica Applicata; 2021, 51, 2; 281-288
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modulation Mechanism of Acoustic Scattering in Underwater Corner Reflectors with Acoustic Metasurfaces
Autorzy:
Du, Jiaman
Peng, Zilong
Ge, Lili
Lyu, Shijin
Zhou, Fulin
Liu, Yan
Powiązania:
https://bibliotekanauki.pl/articles/31339794.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic scattering
metasurface
ray tracing
corner reflector
virtual source method
Opis:
Using the tunderwater corner reflector (CR) to simulate the acoustic scattering characteristics of the military target is a new technology to counter active sonar detection. Existing underwater CRs only have the ability to interfere with the acoustic field, but have limitations in acoustic wave modulation. Therefore, acoustic metasurfaces applied on CRs to enhance the ability of acoustic wave modulation has a great application prospect. A fast prediction method based on the Kirchhoff approximation (KA) and the ray tracing theory is proposed to calculate the acoustic scattering characteristics of CR with acoustic metasurfaces in grooves array type. The accuracy of the method is verified by the finite element method (FEM) simulation. The modulation effect of CR with grooves array in different gradient combinations on the structural scattering acoustic field is analyzed. The research shows that the CR with different combinations of the acoustic metasurface has an obvious modulation effect on the amplitude of the acoustic waves and the deflection of acoustic field. In particular, the grooves array in combination with positive and negative gradients has an obvious deflection impact on the scattering acoustic field.
Źródło:
Archives of Acoustics; 2023, 48, 4; 465-473
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie trajektorii promieni i czasów przebiegu fal odbitych PP, SS i PS dla dyskretnego ośrodka poprzecznie izotropowego z nachyloną osią symetrii
The modeling of ray trajectories and travel times of reflected PP, SS, and PS waves in the discrete transversely isotropic medium with tilted symmetry axis
Autorzy:
Kasina, Z.
Powiązania:
https://bibliotekanauki.pl/articles/183652.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
anizotropia
geofizyka
metody sejsmiczne
hodografy
trasowanie promieni
geophysics
seismic methods
anisotropy
hodographs
ray tracing
Opis:
In the presented paper the basic assumptions of the algorithm and program of seismic ray trajectories and travel times modelling are described for the case of reflected PP, SS and PS waves in the discrete anisotropic (transversely isotropic) medium with tilted symmetry axis. The ray trajectories and travel times in the discrete horizontally layered medium (VTI) and in the monoclinally dipping layers are defined by means of the numerical solution of the partial equations set resulting from the Fermat principle. The values of the velocities and Thomsen anisotropy parameters are defined in the nodes of the assumed, two dimensional grid. The comparison of the reflection waves hodographs was accomplished for selected isotropic and anisotropic models in the case of CDP gathers.
Źródło:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2009, 35, 2/1; 387-392
0138-0974
Pojawia się w:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling with seismic ray tracing in inhomogeneous geological formation
Modelowanie sejsmiczne ośrodków niejednorodnych metodą "punkt strzałowy - punkt odbioru"
Autorzy:
Cygan, S.
Powiązania:
https://bibliotekanauki.pl/articles/952728.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
śledzenie promienia sejsmicznego
kaustyki
strefa cienia
modelowanie sejsmiczne
seismic ray tracing
caustic points
shadow zone
seismic modeling
Opis:
Seismic ray tracing is an useful tool to solve the complicated problem of wave propagation. It makes possible obtaining essential information about wave propagation in geological media without necessity of computing the full wave field. In this paper the theoretical principle of seismic ray tracing has been presented. Moreover few typical models of inhomogeneous geological media have been taking into account. Ray tracing methods have been divided into several categories and shooting method has been particularly described. Using results of modeling realized with the SEISMIC UN*X system, advantages and possibilities of the practical application in seismic tomography have been shown.
Śledzenie promienia sejsmicznego jest narzędziem do rozwiązywania złożonego zagadnienia propagacji fal. Pozwala uzyskać istotne informacje o rozchodzeniu się fal sejsmicznych w ośrodku geologicznym bez konieczności wyznaczania pełnego pola falowego. W artykule przedstawiono podstawy teoretyczne śledzenia promieni sejsmicznych w kilku wzorcowych modelach niejednorodnych ośrodków geologicznych. Szczególną uwagę zwrócono na modele ośrodków o stałym i o zmiennym gradiencie prędkości w warstwach. Szczegółowo opisano metodę "punkt strzałowy - punkt odbioru". Wykorzystując wyniki modelowania wykonanego za pomocą systemu SEISMIC UN*X, pokazano jego zalety oraz możliwości wykorzystania zarówno w sejsmice głębokiej, jak i płytkiej.
Źródło:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2006, 32, 4; 451-462
0138-0974
Pojawia się w:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
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