Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Ray Tracing" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 22
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:
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:
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:
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:
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:
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:
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:
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:
Crustal structure of the Trans-European Suture Zone in Central Poland - reinterpretation of the LT-2, LT-4 and LT-5 deep seismic sounding profiles
Autorzy:
Grad, M.
Guterch, A.
Polkowska-Purys, A.
Powiązania:
https://bibliotekanauki.pl/articles/2058903.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
TESZ
crustal structure
seismic refraction
ray tracing
Opis:
The paper gives a reinterpretation of data from three deep seismic sounding profiles-LT-2, LT-4 and LT-5 - acquired in 1974-1979 between the Precambrian East European Craton (EEC) and the Palaeozoic Platform (PP) in Central Poland. Good quality seismic records in the distance interval from 50-90 to 200-280 km were the input data for the modelling of the crustal and uppermost mantle structure. Clear first arrivals and later phases of waves reflected/refracted from the crustal and the Moho boundaries were interpreted using a two-dimensional (2-D) ray tracing technique. In general, the crustal thickness along the three profiles varies from 30-35 km in the Palaeozoic platform area, to 42-44 km in the Polish part of the EEC, being 35-40 km in the transition zone between the PP and the EEC. In the transition area, the P-wave velocity is very low (Vp < 6.0 km/s) down to depths of 15-18 km, indicating that a very thick succession of sedimentary, metamorphosed or volcanic origin rocks is present there. All three 2-D models of the crust are discussed together with results obtained 20-30 years ago, particularly taking into account the difference in interpretation methods and new computation possibilities. Jointly with recent seismic studies along the profiles LT-7 and TTZ, as well as the POLONAISE'97 profiles P1-P4, the reinterpreted old profiles provide a collection of crustal models of the TESZ in Poland.
Źródło:
Geological Quarterly; 2005, 49, 3; 243--252
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A skew ray tracing approach for error analysis of a light ray path for optical systems with asymmetrical optical axes
Autorzy:
Liao, T T
Kung, C
Chen, C T
Powiązania:
https://bibliotekanauki.pl/articles/173300.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
skew ray tracing
homogeneous coordinate transformation matrix
error analysis
Opis:
This study applies a skew ray tracing approach based on a 4×4 homogeneous coordinate transformation matrix and Snell’s law to analyze the errors of a ray light path as it passes through a series of optical elements in an asymmetrical optical system. The proposed error analysis methodology considers two principal sources of a light path error, namely: i) the translational errors and the rotational errors which determine the deviation of the light path at each boundary surface, and ii) the differential changes induced in the incident point position and unit directional vector of the refracted/reflected ray as a result of differential changes in the position and unit directional vector of the light source. The validity of the proposed methodology is verified by analyzing the effects of optical errors in a corner cube.
Źródło:
Optica Applicata; 2015, 45, 2; 249-261
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:
Formation of Scattering Characteristics for Acoustical Ray Tracing Simulation
Autorzy:
Bojičić, S.
Šumarac-Pavlović, D.
Mijić, M.
Powiązania:
https://bibliotekanauki.pl/articles/178159.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
diffuse reflection
ray tracing
room acoustics
secondary source
scattering pattern
Opis:
Ray tracing simulation of sound field in rooms is a common tool in room acoustic design for predicting impulse response. There are numerous commercial engineering tools utilising ray tracing simulation. A specific problem in the simulation is the modelling of diffuse reflections when contribution of individual surface is prevailing. The paper introduces modelling of scattering which is interesting when the whole impulse response of a room is not a goal but contribution of certain surface. The main goal of the Project is to shape directivity characteristics of scattered reflection. Also, an innovative approach is suggested for converting the energy histogram information obtained by ray tracing into an “equivalent impulse response”. The proposed algorithm is tested by comparing the results with measurements in a real sound field, realised in a scaled model where a diffusing surface is hardware-implemented.
Źródło:
Archives of Acoustics; 2018, 43, 4; 657-667
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of near field of the GSM base station antennas in urban environment
Autorzy:
Wójcik, D.
Powiązania:
https://bibliotekanauki.pl/articles/309235.pdf
Data publikacji:
2003
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
dozymetria
GSM
RF dosimetries
human exposure
radio base station
ray tracing
Opis:
A simple and efficient method for evaluation of near field of the GSM base station antennas in urban environment is presented in this paper. The method is based on the replacement of panel antenna with a discrete linear array. Moreover, the geometrical optics approach is used to consider the influence of environment. The approximate results are found to be in excellent agreement with the results obtained by using the method of moments (MoM). Presented method can be successfully used for fast evaluation of exposure to electromagnetic fields emitted by the GSM base station antennas in urban environment.
Źródło:
Journal of Telecommunications and Information Technology; 2003, 1; 41-44
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of external microtextures for efficient light outcoupling in OLEDs with different preferential orientation of emission dipoles
Autorzy:
Kovačič, Milan
Powiązania:
https://bibliotekanauki.pl/articles/2074200.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
organic light-emitting diode
light outcoupling
dipole orientation
ray tracing
optical modelling
Opis:
External light outcoupling structures provide a cost-effective and highly efficient solution for light extraction in organic light-emitting diodes. Among them, different microtextures, mainly optimized for devices with isotopically oriented emission dipoles, have been proposed as an efficient light extraction solution. In the paper, the outcoupling for a preferential orientation of emission dipoles is studied for the case of a red bottom-emitting organic light-emitting diode. Optical simulations are used to analyse the preferential orientation of dipoles in combination with three different textures, namely hexagonal array of sine-textures, three-sided pyramids, and random pyramids. It is shown that while there are minimal differences between the optimized textures, the highest external quantum efficiency of 51% is predicted by using the three-sided pyramid texture. Further improvements, by employing highly oriented dipole sources, are examined. In this case, the results show that the top outcoupling efficiencies can be achieved with the same texture shape and size, regardless of the preferred orientation of the emission dipoles. Using an optimized three-sided pyramid in combination with ideally parallel oriented dipoles, an efficiency of 62% is achievable. A detailed analysis of the optical situation inside the glass substrate, dominating external light outcoupling, is presented. Depicted results and their analysis offer a simplified further research and development of external light extraction for organic light-emitting devices with highly oriented dipole emission sources.
Źródło:
Opto-Electronics Review; 2022, 30, 2; art. no. e141542
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lithospheric structure of the western part of the East European Craton investigated by deep seismic profiles
Autorzy:
Grad, M.
Janik, T.
Guterch, A.
Środa, P.
Czuba, W.
Powiązania:
https://bibliotekanauki.pl/articles/2058944.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
East European Craton
crustal structure
mantle reflectors
deep seismic refraction
seismic ray tracing
Opis:
The Palaeoproterozoic collision of Archaean Fennoscandia, Volgo-Uralia and Sarmatia, viewed as a large composite of terranes, each with an independent history during Archaean and Early Proterozoic time, formed the East European Craton. This paper summarizes the results of deep seismic sounding investigations of the lithospheric structure of the southwestern part of the East European Craton. On the basis of the modern EUROBRIDGE’94–97, POLONAISE’97 and CELEBRATION 2000 projects, as well as of data from the Coast Profile and from reinterpreted profiles VIII and XXIV, the main tectonic units of Fennoscandia and Sarmatia are characterized. The crustal thickness in the whole area investigated is relatively uniform, being between 40 and 50 km (maximum about 55 km). For Fennoscandia, the crystalline crust of the craton can be generally divided into three parts, while in Sarmatia the transition between the middle and lower crust is smooth. For both areas, relatively high P-wave velocities ( 7.0 km/s) were observed in the lower crust. Relatively high seismic velocities of the sub-Moho mantle (~8.2–8.3 km/s) were observed along most of the profiles. The uppermost mantle reflectors often occur ca. 10 to 15 km below the Moho. Finally, we show the variability in physical properties for the major geological domains of Fennoscandia and Sarmatia, which were crossed by the network of our profiles.
Źródło:
Geological Quarterly; 2006, 50, 1; 9-22
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies