Academic literature on the topic 'Far-Field approximation'

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Journal articles on the topic "Far-Field approximation"

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Mishchenko, Michael I. "Far-field approximation in electromagnetic scattering." Journal of Quantitative Spectroscopy and Radiative Transfer 100, no. 1-3 (2006): 268–76. http://dx.doi.org/10.1016/j.jqsrt.2005.11.044.

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Shpakov, V., S. B. Dabagov, M. Castellano, et al. "Far- and near-field approximation for diffraction radiation." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 309 (August 2013): 194–97. http://dx.doi.org/10.1016/j.nimb.2013.02.056.

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Constantin, Peter. "Far-field perturbations of vortex patches." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2050 (2015): 20140277. http://dx.doi.org/10.1098/rsta.2014.0277.

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In this paper I investigate the dynamics of vortex patches in the Yudovitch phase space. I derive an approximation for the evolution of the vorticity in the case of nested vortex patches with distant boundaries, and study its long-time behaviour.
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Chaumet, Patrick C., Ting Zhang, and Anne Sentenac. "Fast far-field calculation in the discrete dipole approximation." Journal of Quantitative Spectroscopy and Radiative Transfer 165 (November 2015): 88–92. http://dx.doi.org/10.1016/j.jqsrt.2015.06.024.

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Magliula, Elizabeth A., J. Gregory McDaniel, and Allan D. Pierce. "Far-field approximation for a point-excited anisotropic plate." Journal of the Acoustical Society of America 134, no. 5 (2013): 4012. http://dx.doi.org/10.1121/1.4830638.

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Magliula, Elizabeth A., J. Gregory McDaniel, and Allan D. Pierce. "Far-field approximation for a point-excited anisotropic plate." Journal of the Acoustical Society of America 131, no. 6 (2012): 4535–42. http://dx.doi.org/10.1121/1.4707482.

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Apaydin, Gokhan, Cai-Cheng Lu, Levent Sevgi, and Weng Cho Chew. "A Groundwave Propagation Model Using a Fast Far-Field Approximation." IEEE Antennas and Wireless Propagation Letters 16 (2017): 1369–72. http://dx.doi.org/10.1109/lawp.2016.2636802.

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Bhattacharya, S., J. Bławzdziewicz, and E. Wajnryb. "Far-field approximation for hydrodynamic interactions in parallel-wall geometry." Journal of Computational Physics 212, no. 2 (2006): 718–38. http://dx.doi.org/10.1016/j.jcp.2005.07.015.

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Biazar, Jafar, and Mohsen Didgar. "Numerical Solution of Riccati Equations by the Adomian and Asymptotic Decomposition Methods over Extended Domains." International Journal of Differential Equations 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/580741.

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We combine the Adomian decomposition method (ADM) and Adomian’s asymptotic decomposition method (AADM) for solving Riccati equations. We investigate the approximate global solution by matching the near-field approximation derived from the Adomian decomposition method with the far-field approximation derived from Adomian’s asymptotic decomposition method for Riccati equations and in such cases when we do not find any region of overlap between the obtained approximate solutions by the two proposed methods, we connect the two approximations by the Padé approximant of the near-field approximation. We illustrate the efficiency of the technique for several specific examples of the Riccati equation for which the exact solution is known in advance.
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Zareian, Nima, Payam Abolghasem, and Amr S. Helmy. "Far Field of Bragg Reflection Waveguides: Characteristics and Closed-Form Approximation." Journal of Lightwave Technology 29, no. 5 (2011): 728–35. http://dx.doi.org/10.1109/jlt.2010.2102741.

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Dissertations / Theses on the topic "Far-Field approximation"

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Mavaleix-Marchessoux, Damien. "Modelling the fluid-structure coupling caused by a far-field underwater explosion." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAE012.

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Les sous-marins militaires doivent résister aux sollicitations induites par une explosion sous-marine. Pour s'en assurer, la simulation numérique est d'une importance capitale, compte tenu du coût très élevé des campagnes expérimentales. Une explosion sous-marine lointaine est un événement complexe qui a deux effets distincts : elle libère une onde de choc, puis crée une bulle de gaz oscillante qui pousse une grande quantité d'eau plus lentement. Les deux phénomènes ont des caractéristiques et des échelles de temps assez différentes. Dans ce travail, nous supposons que l'explosion est suffisamment éloignée pour (i) que la présence du navire affecte peu l'explosion, et (ii) permettre une séparation temporelle des deux phénomènes, tels que perçus par le navire. Dans ces conditions, notre objectif est de concevoir, implémenter (dans le cadre du calcul haute performance) puis valider une méthodologie de simulation numérique pour le problème d'interaction fluide-structure prenant en compte les deux phénomènes. Pour ce faire, nous commençons par étudier les deux perturbations en l'absence du sous-marin, pour déduire une modélisation et des méthodes numériques adaptées. Nous développons ensuite une procédure éléments de frontière (BEM) accélérée, basée sur une combinaison de la méthode de quadrature de convolution avec une approximation haute fréquence empirique originale. Plus largement, cette procédure permet de simuler efficacement des problèmes transitoires rapides 3D de propagation d'ondes en milieu non-borné, et offre une complexité très favorable : O(1) par rapport à la discrétisation temporelle et O(N log N) par rapport à la discrétisation spatiale. Enfin, nous mettons en place des stratégies performantes de couplage éléments finis/éléments de frontière (FEM/BEM) pour la phase d'interaction fluide-structure de l'onde de choc (acoustique linéaire) et celle de la bulle de gaz (écoulements incompressibles). La procédure globale, validée sur des problèmes académiques, fournit des résultats très prometteurs sur des cas industriels réalistes<br>Submarines must withstand the effects of rapid dynamic loads induced by underwater explosions. Due to the very high cost of experimental campaigns, numerical simulations are very important. A remote underwater explosion is a complex event that has two distinct effects: it sends a shock wave, then creates an oscillating gas bubble that sets water in slower motion. The two phenomena have quite different characteristics and time scales. In this work, we consider remote enough underwater explosions so that (i) the presence of the submarine only marginally affects the explosion, and (ii) there is a temporal separation of the two phenomena, as experienced by the ship. Under these conditions, our overall goal is to design, implement (in the context of high performance computing) then validate a computational methodology for the fluid-structure interaction problem, taking into account both phenomena. With this aim, we first study the two perturbations without considering the submarine, to propose appropriate modelling and numerical methods. Then, we design a fast boundary element (BEM) procedure, based on the combination of the convolution quadrature method and an original empirical high frequency approximation. The procedure allows to efficiently simulate 3D rapid transient wave propagation problems set in an unbounded domain, and shows advantageous complexity: O(1) in regards to the time discretisation and O(N log N) for the spatial discretisation. Finally, we implement adequate finite element/boundary element (FEM/BEM) coupling strategies for the shock wave fluid-structure interaction phase (linear acoustics) and that of the gas bubble (incompressible flow). The overall procedure, validated on academic problems, provides very promising results when applied on realistic industrial cases
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Říha, René. "Využití metody FDTD k modelování zobrazování v biofotonice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417154.

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This thesis deals with the problem of practical application of FDTD technique for simulation of image formation in coherence controlled holographic microscope. Various ways for obtaining scattering matrices are explored in detail and the optimal technique based on a rigorous calculation of the far field is proposed. The scattering matrix, containing information about the observed sample, is subsequently used in analytic calculation of holographic signal; two levels of approximation of pupil function are also evaluated. The results are compared with a traditional approach based on Rytov approximation resulting in specification of the parameter domain where the approximation is applicable. Based on the simulations of the microscope, the dependence of axial resolution on apertures of the objective and the condenser and sensitivity of the signal to changes of refractive index of the sample is also studied.
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Charrayre, François. "Modélisation de fermes de systèmes houlomoteurs : effets d’interactions entre systèmes à l’échelle de la ferme et impact sur le climat de vagues à l'échelle régionale." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1097/document.

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Cette thèse porte sur le développement d'un ensemble d'outils numériques destinés à simuler différents aspects des interactions vagues-structure appliquées à l'exploitation des systèmes de récupération de l'énergie des vagues (SREV). Elle a été réalisée dans le cadre du projet ANR Monacorev (projet ANR11-MONU-018-01, 2012-2015).L'objectif est de pouvoir traiter la question des interactions à l'échelle d'une ferme de SREVs (≈ 1 km), et d'étudier l'impact d'une ou plusieurs fermes de SREVs à l'échelle régionale (≈ 10km) sur le champ de vague total. Des méthodes de modélisation et de simulation adaptées sont développées pour chacune de ces deux échelles. Jusqu'à présent, les interactions entre les SREVs étaient bien souvent étudiées en considérant que le fond était plat (l'influence d'un fond variable sur le champ de houle au niveau de la ferme étant alors jugé négligeable), ce qui permet de calculer facilement et rapidement le champ de vagues et les interactions grâce à l'utilisation de la théorie linéaire potentielle. Une application pratique de cette méthode est le calcul du rendement d'une ferme de SREVs, et l'optimisation de leurs positions relatives au sein d'un parc. Dans le cadre de la théorie linéaire, cette thèse propose une méthodologie de couplage originale entre un code de tenue à la mer (Aquaplus) et un code de propagation de la houle en zone côtière (Artemis), laquelle a été développée et qualifiée. Les simulations réalisées montrent que, pour une configuration de ferme de SREVs donnée, on ne peut pas toujours négliger les effets de la bathymétrie. Par exemple, la présence d'une plage de pente 10% au large d'une ferme de SREV peut modifier la hauteur des vagues de manière significative, et affecter ainsi le rendement de la ferme de manière significative par rapport au cas où le fond est uniformément plat. A l'échelle côtière régionale, il est aussi intéressant de simuler et prédire l'impact de fermes de SREVs sur le champ de vagues. Pour des raisons d'efficacité, une approche à phases moyennées de modélisation des vagues a été privilégiée, fondée sur le code spectral d'états de mer Tomawac. La représentation des effets d'un SREV à travers l'utilisation d'un terme puits (concept permettant de soustraire au spectre d'énergie d'état de mer local l'énergie correspondant à celle absorbée par le SREV), bien qu'incomplète du fait que les effets de radiation/diffraction ne sont pas pris en compte, a été étudiée et testée. Une nouvelle méthodologie prenant en compte ces effets dans un code spectral est présentée ici et testée, avec l'objectif de pallier à ces limitations. Les discussions sur la validité de deux approches permettent d'esquisser des pistes de développements ultérieurs pour la représentation des fermes de SREV à l'échelle régionale<br>This thesis focuses on the development of a set of numerical tools to simulate different aspects of the wave-body interactions applied to the exploitation of wave energy converters (WEC). It was conducted under the ANR Monacorev project (project-ANR11 MONU-018-01, 2012-2015).The objective is to address the issue of the interactions at the scale of a farm of WECs (≈ 1 km), and to study the impact of one or more WEC farms at the regional scale (≈ 10km ) on the total wave field. Modeling and simulation methods adapted for each of these two scales are developed. Until now, the interactions between WECs was often studied by considering that the bottom was flat (the influence of a variable bathymetry on the wave field at the farm site being considered to be negligible), allowing to easily and quickly calculate the wave field and interactions through the use of linear potential theory. A practical application of this method is the yield estimation for a WEC farm and the optimization of the WEC position within a park. In the framework of the linear theory, this thesis proposes an original coupling methodology between a seakeeping (Aquaplus) and a wave propagation code in coastal areas (Artemis), which was developed and qualified. Simulations show that, for a given WEC farm configuration, effects of the bathymetry cannot systematically ignored. For example, the presence of a 10% slope close to a WEC farm can significantly modify the wave height, and thus affect the performance of the farm by several percent compared to the case with a uniformly flat bottom. At the regional coastal scale, it is also interesting to simulate and predict the impact of WEC farms on the wave field. At this scale, for efficiency reasons, a phase-averaged simulation of waves was preferred, based on the sea state spectral code TOMAWAC. The representation of the effects of a WEC through the use of a sink-term (concept for subtracting the energy equivalent to that absorbed by the WEC to the sea state energy spectrum), though incomplete due to the fact that the scattering effects are not taken into account, has been studied and tested. A new methodology taking into account these effects in a spectral code is presented here and tested with the aim to overcome these limitations. Discussions on the validity of these approaches allow us to propose possible future developments for the modeling of WEC farm at the regional scale
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Teran, Balbuena Edgar. "Hartree-Fock-Bogoliubov calculations for nuclei far from stability." 2003. http://etd.library.vanderbilt.edu/ETD-db/available/etd-03312003-163407/.

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Books on the topic "Far-Field approximation"

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Center, Langley Research, ed. A novel method of calculating far-field patterns of large aperture antennas. National Aeronautics and Space Administration, Langley Research Center, 1986.

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Deruelle, Nathalie, and Jean-Philippe Uzan. The post-Newtonian approximation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198786399.003.0052.

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This chapter embarks on a study of the two-body problem in general relativity. In other words, it seeks to describe the motion of two compact, self-gravitating bodies which are far-separated and moving slowly. It limits the discussion to corrections proportional to v2 ~ m/R, the so-called post-Newtonian or 1PN corrections to Newton’s universal law of attraction. The chapter first examines the gravitational field, that is, the metric, created by the two bodies. It then derives the equations of motion, and finally the actual motion, that is, the post-Keplerian trajectories, which generalize the post-Keplerian geodesics obtained earlier in the chapter.
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Book chapters on the topic "Far-Field approximation"

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Quak, Dirk. "Time-Domain Born Approximation to the Far-Field Scattering of Plane Elastic Waves by an Elastic Heterogeneity." In Elastic Wave Propagation - Proceedings of the Second I.U.T.A.M. - I.U.P.A.P. Symposium on Elastic Wave Propagation, Galway, Ireland, March 20–25, 1988. Elsevier, 1989. http://dx.doi.org/10.1016/b978-0-444-87272-2.50076-2.

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Íñiguez, J. "First-Principles Studies of Structural Domain Walls." In Domain Walls. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.003.0003.

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This chapter discusses representative first-principles studies of structural domain walls in ferroics, focusing on the compounds that have received most attention by the simulations community so far: perovskite oxides. It describes in some detail a reduced number of case studies that come handy to illustrate different effects and to highlight the added value of the first-principles investigations. As regards the simulation methods, the chapter focuses on applications of density functional theory (DFT), typically employing an approximation for an effective treatment of ionic cores. A discussion on the application to domain-wall problems of first-principles-based methods for large-scale simulations of ferroelectrics and ferroelastics is also included. Finally, this chapter briefly on the opportunities and challenges for first-principles research in this field.
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Newnham, Robert E. "Nonlinear phenomena." In Properties of Materials. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198520757.003.0017.

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The physical properties discussed thus far are linear relationships between two measured quantities. This is only an approximation to the truth, and often not a very good approximation, especially for materials near a phase transformation. A more accurate description can be obtained by introducing higher order coefficients. To illustrate nonlinearity we discuss electrostriction, magnetostriction, and higher order elastic, and dielectric effects. These phenomena are described in terms of fourth and sixth rank tensors. Many of the recent innovations in the field of electroceramics have exploited the nonlinearities of material properties with factors such as electric field, mechanical stress, temperature, or frequency. The nonlinear dielectric behavior of ferroelectric ceramics (Fig. 15.1), for example, has opened up new markets in electronics and communications. In these materials the electric polarization saturates under high fields. Electric displacement Di varies with applied electric field Ej as . . . Di = εijEj + εijkEjEk + εijklEjEkEl +· · · , . . . where εij is the dielectric permittivity and εijk and εijkl are higher order terms. The data in Fig. 15.1 were collected for a relaxor ferroelectric in its paraelectric state above Tc where the symmetry is centrosymmetric. Therefore the third rank tensor εijk is zero, and the shape of the curve is largely controlled by the first and third terms. For cubic crystals, the fourth rank tensor εijkl is similar in form to the elastic constants discussed in Chapter 13. Tunable microwave devices utilize nonlinear dielectrics in which the polarization saturates as in Fig. 15.1. By applying a DC bias the dielectric constant can be adjusted over a wide range.
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"Wide-Angle Near and Far Field Approximations for Scalar Diffraction." In Diffraction, Fourier Optics and Imaging. John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470085004.ch7.

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Dramis, Francesco, and Emanuele Tondi. "Neotectonics." In The Physical Geography of Western Europe. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780199277759.003.0011.

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Debate in neotectonics mainly hinges on how far back in time the prefix ‘neo’ should be taken. The term ‘neotectonics’ means, in a first approximation, geologically young, recent or living (active) crustal structures and processes. Some of the many definitions (Angelier 1976; Mercier 1976; Beloussov 1978; Hancock and Williams 1986; Vita-Finzi 1986; Winslow 1986) focus neotectonic studies only on active deformation (late Quaternary–Present) and accept neotectonics as more or less synonymous to active tectonics, while others trace the neotectonic period mainly from the Middle Miocene. It is very difficult to identify a standard time period for defining the beginning of neotectonics, but the present-day opinion is that it depends on the individual characteristics of each geological environment. According to Fourniguet (1987), no time limit is fixed and the field of investigation extends from the present as far back into the past as necessary to understand present or active deformation. The INQUA (International Union for Quaternary Research) Tectonic Commission has accepted the definition of Mörner (1978): ‘Neotectonics is defined as any earth movements or deformations of the geodetic reference level, their mechanisms, their geological origin, their implications for various practical purposes and their future extrapolations.’ Pavlides (1989) proposed a definition along the following lines: ‘Neotectonics is the study of young tectonic events (deformation of upper crust), which have occurred or are still occurring in a given region after its final orogeny (at least for recent orogenies) or more precisely after its last significant reorganization.’ When western Europe is considered, a major change in boundary conditions occurred in the Upper Miocene (7 Ma) when the motion of Africa became directed to the north-west (Dewey et al. 1989). Geological, seismological, and geodetic data in the Mediterranean region and in continental Europe show that the relative motion of Africa and Europe is still in this direction. For this reason we think that for the neotectonics of western Europe one cannot go far back in time beyond the Upper Miocene. The study of the state of stress of the lithosphere around the world has recently been attempted within the World Stress Map Project of the International Lithosphere Programme (Zoback 1992).
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Conference papers on the topic "Far-Field approximation"

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Svilainis, L., and V. Dumbrava. "LED Far Field Pattern Approximation Performance Study." In 2007 29th International Conference on Information Technology Interfaces. IEEE, 2007. http://dx.doi.org/10.1109/iti.2007.4283847.

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Zheng, Yingcai, and Yaofeng He. "The far‐field approximation in seismic interferometry." In SEG Technical Program Expanded Abstracts 2010. Society of Exploration Geophysicists, 2010. http://dx.doi.org/10.1190/1.3513694.

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Karamanos, K., and Daniel M. Dubois. "Recycling the Independent Field Approximation Argument in the Far Field." In COMPUTING ANTICIPATORY SYSTEMS: CASYS ‘09: Ninth International Conference on Computing Anticipatory Systems. AIP, 2010. http://dx.doi.org/10.1063/1.3527184.

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Hosseini, Amir, and Ray T. Chen. "Far-field approximation in two-dimensional slab-waveguides." In SPIE OPTO, edited by Joel A. Kubby and Graham T. Reed. SPIE, 2011. http://dx.doi.org/10.1117/12.873652.

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Kee, Chun Yun, and Chao-Fu Wang. "Far field approximation of half-space Green's function." In 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2017. http://dx.doi.org/10.1109/apusncursinrsm.2017.8072721.

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Holland, Peter. "A far-field approximation for high-speed impulsive noise prediction." In 34th Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-11.

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Kaczmarski, K. J., and S. R. Laxpati. "Far-field approximation in the Inverse Discrete Dipole Method (IDDM)." In amp; USNC/URSI National Radio Science Meeting. IEEE, 2009. http://dx.doi.org/10.1109/aps.2009.5172171.

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Tanaka, Tai, Yoshio Inasawa, Yasuhiro Nishioka, and Hiroaki Miyashita. "Verification of characteristic basis function method using fast far-field approximation." In 2016 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). IEEE, 2016. http://dx.doi.org/10.1109/usnc-ursi.2016.7588510.

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Li, Shangyang, and Feng Xu. "Discrete Dipole Approximation for Predicting Far-Field Pattern of Slotted Waveguide Antennas." In 2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE). IEEE, 2018. http://dx.doi.org/10.1109/isape.2018.8634172.

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Li, Lianhuang, and Fuyuan Guo. "Analysis on the Gaussian approximation for the far-field of optical fiber." In Photonics Asia 2010, edited by Xuping Zhang, Hai Ming, and Alan Xiaolong Wang. SPIE, 2010. http://dx.doi.org/10.1117/12.868764.

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Reports on the topic "Far-Field approximation"

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Oberer, R. B., C. A. Gunn, and L. G. Chiang. Far-Field Approximation in the Generalized Geometry Holdup (GGH) Model. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/900342.

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Weiner, Melvin M. Overestimation of On-Axis Power Density by the Fraunhofer ('Far-Field') Approximation. Defense Technical Information Center, 1987. http://dx.doi.org/10.21236/ada186399.

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Ford, S. R. Testing the MDAC2 Far-field Approximation with Application to SPE-5 and DAG-2. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1566794.

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