Bibliographies thématiques / Ray-tracing studies

Littérature scientifique sur le sujet « Ray-tracing studies »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Ray-tracing studies"

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AL-Behadili, Hasanain A. H., Mohsin Najim Sarayyih Almaliki et Saddam K. Alwan AlWane. « A Ray Tracing Model for Wireless Communications ». International Journal of Interactive Mobile Technologies (iJIM) 13, no 11 (15 novembre 2019) : 245. http://dx.doi.org/10.3991/ijim.v13i11.11730.

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<p>Recently, there has been an interest in modelling of the communication process. One of the most important reasons for developing such models is to forecast what will be happened. A number of modelling studies provide several assumptions and use different theories. up to now, there is still a lack of an optimum model which can be used for the purpose of future communications. This indicates a need to understand the aspects of communication modelling and the motivation behind improving our knowledge in this field. This paper details work done to design a propagation model of a wireless communication system to give a forecast of signal behavior. Data for this study were collected using a wireless communication system employed in the outdoor environment. The final part of this paper gives a summary and description of findings which include a comparison between the experimental and simulation results. The model finally shows a similar trend with the observation.</p>
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Edlabadkar, V. S., et Ashok Pimpale. « Ray tracing studies of a complete plane grating monochromator beam line ». Pramana 42, no 1 (janvier 1994) : 65–77. http://dx.doi.org/10.1007/bf02847334.

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Van Avendonk, Harm J. A., Alistair J. Harding, John A. Orcutt et W. Steven Holbrook. « Hybrid shortest path and ray bending method for traveltime and raypath calculations ». GEOPHYSICS 66, no 2 (mars 2001) : 648–53. http://dx.doi.org/10.1190/1.1444955.

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The shortest path method (SPM) is a robust ray‐tracing technique that is particularly useful in 3-D tomographic studies because the method is well suited for a strongly heterogeneous seismic velocity structure. We test the accuracy of its traveltime calculations with a seismic velocity structure for which the nearly exact solution is easily found by conventional ray shooting. The errors in the 3-D SPM solution are strongly dependent on the choice of search directions in the “forward star,” and these errors appear to accumulate with traveled distance. We investigate whether these traveltime errors can be removed most efficiently by an SPM calculation on a finer grid or by additional ray bending. Testing the hybrid scheme on a realistic ray‐tracing example, we find that in an efficient mix ray bending and SPM account for roughly equal amounts of computation time. The hybrid method proves to be an order of magnitude more efficient than SPM without ray bending in our example. We advocate the hybrid ray‐tracing technique, which offers an efficient approach to find raypaths and traveltimes for large seismic refraction studies with high accuracy.
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Gaelzer, R., L. F. Ziebell et R. S. Schneider. « Ray tracing studies on auroral kilometric radiation in finite width auroral cavities ». Journal of Geophysical Research 99, A5 (1994) : 8905. http://dx.doi.org/10.1029/93ja03566.

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Grekov, D. L., V. E. D'Yakov, R. C. Goldfinger et D. B. Batchelor. « Ray tracing studies of lower hybrid plasma heating in an ℓ = 2 torsatron ». Nuclear Fusion 30, no 10 (1 octobre 1990) : 2039–47. http://dx.doi.org/10.1088/0029-5515/30/10/006.

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Deresz, Krystyna A., Piotr Łaski, Radosław Kamiński et Katarzyna N. Jarzembska. « Advances in Diffraction Studies of Light-Induced Transient Species in Molecular Crystals and Selected Complementary Techniques ». Crystals 11, no 11 (3 novembre 2021) : 1345. http://dx.doi.org/10.3390/cryst11111345.

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The review provides a summary of the current methods of tracing photoexcitation processes and structural dynamics in the solid state, putting major emphasis on the X-ray diffraction techniques (time-resolved Laue diffraction on synchrotron sources and time-resolved serial femtosecond crystallography on X-ray free-electron lasers). The recent developments and nowadays experimental possibilities in the field are discussed along with the data processing and analysis approaches, and illustrated with some striking literature examples of the respective successful studies. Selected complementary methods, such as ultrafast electron diffraction or time-resolved X-ray absorption spectroscopy, are briefly presented.
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Pereira, José Carlos Garcia, José Rodríguez, Jorge Cruz Fernandes et Luís Guerra Rosa. « Homogeneous Flux Distribution in High-Flux Solar Furnaces ». Energies 13, no 2 (16 janvier 2020) : 433. http://dx.doi.org/10.3390/en13020433.

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Comparisons between experimental data and ray-tracing simulation results are presented for the high-flux SF60 solar furnace available at the Plataforma Solar de Almeria, Spain, which has an estimated thermal power of 60 kW. Since an important issue in many applications of solar concentrated radiation is to obtain a radiation distribution that is as homogeneous as possible over the central working area, so-called radiation homogenisers were also used but the degree of success achieved is just satisfactory, as the results show. Finally, further modelling studies using ray-tracing simulations aiming to attain a homogenous distribution of flux by means of double reflexion using two paraboloid surfaces are presented.
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ZABOTIN, NIKOLAY A., OLEG A. GODIN, PAUL C. SAVA et LIUDMILA Y. ZABOTINA. « ACOUSTIC WAVEFRONT TRACING IN INHOMOGENEOUS, MOVING MEDIA ». Journal of Computational Acoustics 20, no 03 (septembre 2012) : 1250009. http://dx.doi.org/10.1142/s0218396x12500099.

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We extend the Huygens wavefront tracing algorithm, which is a part of an open source Madagascar project, to sound propagation in inhomogeneous, moving media and apply it to a series of benchmark tasks. One set of tasks admits exact analytic solutions and serves the purpose of validation of the new algorithm. Another set of calculations demonstrates applicability of the algorithm to the studies of wavefront dynamics and stability in ocean and atmospheric acoustics. The method is based on a system of differential equations equivalent to the eikonal equation, but formulated in the ray coordinate system. In this paper, we present a first-order, two-dimensional discretization scheme that is interpreted very simply in terms of the Huygens' principle. The method has proved to be a convenient alternative to conventional ray tracing.
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Chen, Yi, Xian Rong Huang, Ning Zhang, Michael Dudley, Joshua D. Caldwell, Kendrick X. Liu et Robert E. Stahlbush. « Synchrotron X-Ray Topographic Studies of Recombination Activated Shockley Partial Dislocations in 4H-Silicon Carbide Epitaxial Layers ». Materials Science Forum 600-603 (septembre 2008) : 357–60. http://dx.doi.org/10.4028/www.scientific.net/msf.600-603.357.

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Electron-hole recombination activated Shockley partial dislocations bounding expanding stacking faults and their interactions with threading dislocations have been studied in 4H-SiC epitaxial layers using synchrotron x-ray topography. The bounding partials appear as white stripes or narrow dark lines in back-reflection X-ray topographs recorded using the basal plane reflections. Such contrast variations are attributable to the defocusing/focusing of the diffracted X-rays due to the edge component of the partial dislocations, which creates a convex/concave distortion of the basal planes. Simulation results based on the ray-tracing principle confirm our argument. The sign of the partial dislocations can be subsequently determined.
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Tadic, T., Y. Mokuno, Y. Horino et M. Jaksic. « GEOMETRICAL ABERRATIONS IN THE VON HAMOS AND THE PLANE BRAGG CRYSTAL SPECTROMETERS ». International Journal of PIXE 07, no 03n04 (janvier 1997) : 117–33. http://dx.doi.org/10.1142/s0129083597000151.

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Numerical calculations of the effect of the finite dimensions and orientations of source and crystal are presented for plane and von Hamos Bragg crystal spectrometers for PIXE analysis, combined with a position sensitive (X-ray) detector. Analytical studies of all effects are provided. It is shown that some parameters can produce line shifts and asymmetries. A numerical model for an X-ray diffraction ray-tracing procedure for a crystal Bragg spectrometer is described.
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Thèses sur le sujet "Ray-tracing studies"

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Tila, Fai. « Ray tracing coverage and capacity studies for SISO and MIMO communication systems ». Thesis, University of Bath, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760836.

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He, Weiyi. « Optical Design of Beam Shaping Optics for Camera Probe and LED Light Illumination Used for Minimally Invasive Abdominal Surgery ». Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3532.

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The optical design of a LED illuminator and camera imaging system were studied for potential use in a small medical "robotic type" probe to be used for minimally invasive abdominal surgery. Beam shaping optical reflectors were studied to increase the intensity distribution of the LED beam directed toward a close-by target surface. A CMOS/CCD camera and lens was used to image the targeted area. In addition, extensive optical ray tracing simulations were made to predict the intensity patterns. The experimental measurements and ray tracing simulations were in good agreement, and indicated that 20 degree cone reflectors for the LED sources and appropriate micro-lens/CCD chip imaging optics should provide a useful image at a working distance of about 5 cm.
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IMAM, RAYAN MOHAMED ELMUBARAK ALI. « Global Navigation Satellite Systems as Signals of Opportunity for Environmental Applications : Reflectometry and Scintillation ». Doctoral thesis, Politecnico di Torino, 2022. https://hdl.handle.net/11583/2973801.

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Livres sur le sujet "Ray-tracing studies"

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Ling, Hao. Advanced studies of electromagnetic scattering : Final report, July 1, 1992 to April 15, 1994. [Washington, D.C : National Aeronautics and Space Administration, 1994.

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Advanced studies of electromagnetic scattering : Final report, July 1, 1992 to April 15, 1994. [Washington, D.C : National Aeronautics and Space Administration, 1994.

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Chapitres de livres sur le sujet "Ray-tracing studies"

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Debelov, Victor A., Iliya Novikov et Lyudmila Vasilyeva. « Ray Tracing Based on Interpolation of Visibility of Point Light Sources ». Dans Studies in Computational Intelligence, 169–88. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31745-3_9.

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Larsen, Ole Næsbye, William L. Gannon, Christine Erbe, Gianni Pavan et Jeanette A. Thomas. « Source-Path-Receiver Model for Airborne Sounds ». Dans Exploring Animal Behavior Through Sound : Volume 1, 153–83. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97540-1_5.

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AbstractThe Source-Path-Receiver Model (SPRM) is a fundamental concept derived from hazard (including noise) control. It is useful in studies of animal bioacoustics where the sound sources may be animals, humans, or natural events within the habitat and the receivers are animals. It provides a framework for the researcher to ensure all aspects of the scenario being observed or recorded are considered, which could affect the observations. This chapter develops the SPRM for the example of animal acoustic communication, where the source and receiver are animals of the same species. Factors that affect the source and receiver are explained (e.g., age, sex, individual identity, and context). Much emphasis is given to “the path.” The environment through which the sound travels affects the received signal (in terms of its amplitude, frequency, and duration) and exhibits ambient noise, which might affect both sender and receiver. The basic concepts of sound propagation are explained (including Huygens’ principle, ray tracing, Snell’s law, reflection, scattering, reverberation, diffraction, refraction, transmission, absorption, ground effect, atmosphere effects, acoustic mirages, and shadow zones). The SPRM illustrates the importance of exploring the acoustic features of a sound signal at all points between the sender and receiver to understand factors that could promote or inhibit effective communication among animals.
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Actes de conférences sur le sujet "Ray-tracing studies"

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Burkholder, R. J., P. C. Chang, R. J. Marhefka et J. L. Volakis. « UTD ray tracing for building imaging studies ». Dans 2008 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2008. http://dx.doi.org/10.1109/aps.2008.4619157.

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Ichkov, Aleksandar, Petri Mahonen et Ljiljana Simic. « Is Ray-Tracing Viable for Millimeter-Wave Networking Studies ? » Dans 2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications. IEEE, 2020. http://dx.doi.org/10.1109/pimrc48278.2020.9217146.

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Vastberg, A. « Ray tracing studies of multipath fading in the ionospheric HF channel ». Dans 7th International Conference on High Frequency Radio Systems and Techniques. IEE, 1997. http://dx.doi.org/10.1049/cp:19970755.

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Bush, H. Evan, Andrew J. Schrader et Peter G. Loutzenhiser. « Pairing Directional Solar Inputs From Ray Tracing to Solar Receiver/Reactor Heat Transfer Models on Unstructured Meshes : Development and Case Studies ». Dans ASME 2020 14th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/es2020-1615.

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Abstract A novel method for pairing surface irradiation and volumetric absorption from ray tracing to computational heat transfer models is presented. The method is well-suited to directionally and spatially-complex concentrated radiative inputs, such as in solar receivers and reactors. The method employs a generalized algorithm for directly mapping absorbed rays from the ray tracing model to boundary or volumetric source terms in the computational mesh. The algorithm is compatible with unstructured, two and three-dimensional meshes with varying element shapes. To validate the method, four case studies were performed on a directly irradiated, windowed solar thermochemical reactor model. The method was shown to be energy conservative and to preserve spatial variation when mapping rays from a Monte Carlo ray tracing model to the computational heat transfer model in ANSYS Fluent.
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Wu, A. K. C., et S. H. K. Lee. « Multiple-Ray Tracing Scheme for a Packed Bed of Non-Specular Spheres ». Dans ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0626.

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Abstract Radiative heat transfer in a system of packed particles is important for numerous industrial processes. Most of the existing numerical work have focused on specular spheres. There has been relatively less numerical work on a packing of diffuse spheres. There are some numerical studies on diffuse spheres, but their foci were not on the adequacy of the Monte-Carlo ray-tracing scheme. This study examines this issue and presents a modified ray-tracing scheme in which multiple rays are utilized. The results show this scheme to be more accurate for certain porous medium.
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Cherel, L., K. Dehghan, A. Jardin et P. Froidevaux. « Quantitative Structural Effects in Layered Media, an Application of Anisotropic Dynamic Ray Tracing to AVAZ Studies ». Dans 70th EAGE Conference and Exhibition - Workshops and Fieldtrips. European Association of Geoscientists & Engineers, 2008. http://dx.doi.org/10.3997/2214-4609.20148054.

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Karppinen, Mikko, Sanna M. Aikio, Jukka-Tapani Maekinen, Hannu Rajaniemi et Pentti Karioja. « Ray-tracing simulations of free-space optical channels for impulse response studies of indoor data links ». Dans Symposium on Integrated Optoelectronics, sous la direction de Michael R. Feldman, Richard L. Li, W. Brian Matkin et Suning Tang. SPIE, 2000. http://dx.doi.org/10.1117/12.384408.

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Schiricke, Bjo¨rn, Robert Pitz-Paal, Eckhard Lu¨pfert, Andreas Neumann, Klaus Pottler, Markus Pfa¨nder et Klaus-Ju¨rgen Riffelmann. « Validation of Optical Modeling of Parabolic Trough Collectors by Flux Measurement ». Dans ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36216.

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In order to optimize the solar field output of parabolic trough collectors (PTC) it is essential to study the influence of collector and absorber geometry on the optical performance. The optical ray-tracing model of PTC conceived for this purpose uses photogrammetrically measured concentrator geometry in commercial Monte Carlo ray tracing software. The model has been validated with measurements of a scanning flux measurement system, measuring the solar flux density distribution close to the focal line of the PTC. The tool uses fiber optics and a CCD-camera to scan the focal area of a PTC module. Since it is able to quantitatively detect spilled light with good spatial resolution it provides an evaluation of the optical efficiency of the PTC. For comparison of ray tracing predictions with measurements, both flux maps and collector geometry have been measured under identical conditions on the Eurotrough prototype collector at PSA. The validation of the model is provided by three methods: the comparison of measured intercept factors with corresponding simulations; comparison of measured flux density distributions with corresponding ray tracing predictions; and comparison of thermographically measured temperature distribution on the absorber surface with flux density distribution predicted for this surface. Examples of sensitivity studies performed with the validated model are shown.
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Le Houillier, Patrick, et Edward Freniere. « To split or not to split : case studies on Monte Carlo analysis of illumination ray tracing concerning the usefulness of ray-splitting ». Dans SPIE Optics + Photonics, sous la direction de Roland Winston et Pablo Benítez. SPIE, 2006. http://dx.doi.org/10.1117/12.680883.

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Huang, Jialing, Cheng-Xiang Wang, Yingzhuo Sun, Jie Huang et Fu-Chun Zheng. « A Novel Ray Tracing Based 6G RIS Wireless Channel Model and RIS Deployment Studies in Indoor Scenarios ». Dans 2022 IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC). IEEE, 2022. http://dx.doi.org/10.1109/pimrc54779.2022.9977575.

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Rapports d'organisations sur le sujet "Ray-tracing studies"

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Nelson, Nathan, et Charles F. Yocum. Structure, Function and Utilization of Plant Photosynthetic Reaction Centers. United States Department of Agriculture, septembre 2012. http://dx.doi.org/10.32747/2012.7699846.bard.

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Light capturing and energy conversion by PSI is one of the most fundamental processes in nature. In the heart of these adaptations stand PSI, PSII and their light harvesting antenna complexes. The main goal of this grant proposal was to obtain by X-ray crystallography information on the structure of plant photosystem I (PSI) and photosystem II (PSII) supercomplexes. We achieved several milestones along this line but as yet, like several strong laboratories around the world, we have no crystal structure of plant PSII. We have redesigned the purification and crystallization procedures and recently solved the crystal structure of the PSI supercomplex at 3.3 Å resolution. Even though this advance in resolution appears to be relatively small, we obtained a significantly improved model of the supercomplex. The work was published in J. Biol. Chem. (Amunts et al., 2010). The improved electron density map yielded identification and tracing of the PsaK subunit. The location of an additional 10 ß-carotenes, as well as 5 chlorophylls and several loop regions that were previously uninterruptable have been modeled. This represents the most complete plant PSI structure obtained thus far, revealing the locations of and interactions among 17 protein subunits and 193 non-covalently bound photochemical cofactors. We have continued extensive experimental efforts to improve the structure of plant PSI and to obtain PSII preparation amenable to crystallization. Most of our efforts were devoted to obtain well-defined subcomplexes of plant PSII preparations that are amenable to crystallization. We studied the apparent paradox of the high sensitivity of oxygen evolution of isolated thylakoids while BBY particles exhibit remarkable resilience to the same treatment. The integrity of the photosystem II (PSII) extrinsic protein complement as well as calcium effects arise from the Ca2+ atom associated with the site of photosynthetic water oxidation were investigated. This work provides deeper insights into the interaction of PsbO with PSII. Sight-directed mutagenesis indicated the location of critical sites involved in the stability of the water oxidation reaction. When combined with previous results, the data lead to a more detailed model for PsbO binding in eukaryotic PSII.
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