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Littérature scientifique sur le sujet « Focusing wave »

Auteur : Grafiati
Publié le 13 avril 2023

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Articles de revues sur le sujet "Focusing wave"

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Murray, D. R., et P. Öhberg. « Matter wave focusing ». Journal of Physics B : Atomic, Molecular and Optical Physics 38, no 8 (30 mars 2005) : 1227–34. http://dx.doi.org/10.1088/0953-4075/38/8/012.

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Xu, Guochun, Hongbin Hao, Qingwei Ma et Qinqin Gui. « An Experimental Study of Focusing Wave Generation with Improved Wave Amplitude Spectra ». Water 11, no 12 (28 novembre 2019) : 2521. http://dx.doi.org/10.3390/w11122521.

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We experimentally investigate the generating results of space-time focusing waves based on two new wave spectra, i.e., the quasi constant wave amplitude spectrum (QCWA) and the quasi constant wave steepness spectrum (QCWS), in which amplitude and steepness for each wave component can be adjusted with fixed wave energy. The wavemaker signal consists of a theoretical wavemaker motion signal and two different auxiliary functions at two ends of the signal. By testing a series of focusing waves in a physical wave tank, we found that with given wave energy, the QCWA spectrum can produce a focusing wave with larger crest elevation and farther focusing location from the wavemaker flap, as compared with the QCWS spectrum. However, both spectra lead to larger focusing wave crests when the wave frequency bandwidth was narrowed down and a positive correlation between the generated relative wave crest elevation and the input wave elevation parameter. The two spectra produce different focusing wave positions for the same wave frequency range. We also found that the focusing time strongly relates to the energy of the highest-frequency wave component of the wave spectrum.
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Smit, Pieter Bart, T. T. Janssen et T. H. C. Herbers. « TOPOGRAPHY-INDUCED FOCUSING OF RANDOM WAVES ». Coastal Engineering Proceedings 1, no 33 (15 décembre 2012) : 6. http://dx.doi.org/10.9753/icce.v33.waves.6.

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Refraction of narrow-band surface waves in coastal areas can result in wave-focal zones where due to interference, wave statistics vary rapidly and on similar length scales as those of individual waves. However such interference patterns, or wave coherence, are not accounted for in conventional stochastic wave models that are based on the energy balance equation or radiative transfer equation. In this work we present a quasi-coherent theory, which is an extension of the radiative transfer equation and quasi-homogeneous theory. We show that this new stochastic modelling approach can resolve rapid variations in wave statistics that occur in the vicinity of a wave caustic. The results compare favourably to those obtained from ensemble averages calculated with a deterministic phase resolving model (SWASH) and, in a focal zone, constitute a significant improvement over those obtained with a conventional stochastic wave model based on an energy balance equation (SWAN).
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Vogel, K., F. Gleisberg, N. L. Harshman, P. Kazemi, R. Mack, L. Plimak et W. P. Schleich. « Optimally focusing wave packets ». Chemical Physics 375, no 2-3 (octobre 2010) : 133–43. http://dx.doi.org/10.1016/j.chemphys.2010.07.002.

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Chen, Jinbing, et Dmitry E. Pelinovsky. « Rogue periodic waves of the focusing nonlinear Schrödinger equation ». Proceedings of the Royal Society A : Mathematical, Physical and Engineering Sciences 474, no 2210 (février 2018) : 20170814. http://dx.doi.org/10.1098/rspa.2017.0814.

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Rogue periodic waves stand for rogue waves on a periodic background. The nonlinear Schrödinger equation in the focusing case admits two families of periodic wave solutions expressed by the Jacobian elliptic functions dn and cn . Both periodic waves are modulationally unstable with respect to long-wave perturbations. Exact solutions for the rogue periodic waves are constructed by using the explicit expressions for the periodic eigenfunctions of the Zakharov–Shabat spectral problem and the Darboux transformations. These exact solutions generalize the classical rogue wave (the so-called Peregrine’s breather). The magnification factor of the rogue periodic waves is computed as a function of the elliptic modulus. Rogue periodic waves constructed here are compared with the rogue wave patterns obtained numerically in recent publications.
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Zhang, Zhen Fu, Xin Wu Zeng, Qing Yu Cai et Kai Feng Han. « Numerical Simulation on Underwater Shock Wave Focusing ». Applied Mechanics and Materials 105-107 (septembre 2011) : 121–26. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.121.

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Shock wave focusing by an ellipsoidal reflector can produce higher pressure in the focal region. The focusing process of shock wave was studied by theory analyses and numerical results. Base on the experimental observation the shock wave source is equivalent to the explosion of an underwater explosive. A finite element model was set up to investigate the shock wave focusing behaviors. Both the pressure-time history and the peak pressure along the axial position were presented. The shock wave focusing process was shown. The interactions of waves in the focal region are shown. A modified EOS of water was applied, which can be used to analyze the negative pressure observed; the numerical results based on the modified EOS agree well with the experimental data.
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Merkoune, D., J. Touboul, N. Abcha, D. Mouazé et A. Ezersky. « Focusing wave group on a current of finite depth ». Natural Hazards and Earth System Sciences 13, no 11 (19 novembre 2013) : 2941–49. http://dx.doi.org/10.5194/nhess-13-2941-2013.

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Abstract. Formation of freak waves resulting from the wave packets propagating in finite water depth on the background of a current is studied experimentally and numerically. In the experiment, the freak waves appear as a result of dispersion focusing of wave train excited by wave maker with modulated frequency. The space evolution of the frequency modulated train is studied in numerical simulations. We showed that in the water of finite depth, a distance of focusing increases and amplitude in the focal point decreases in comparison with infinite water depth. Experimental results are in good agreement with numerical simulations if wave breaking of surface waves does not occur.
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Zhou, Binzhen, Kanglixi Ding, Jiahao Wang, Lei Wang, Peng Jin et Tianning Tang. « Experimental study on the interactions between wave groups in double-wave-group focusing ». Physics of Fluids 35, no 3 (mars 2023) : 037118. http://dx.doi.org/10.1063/5.0142042.

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Nonlinear interactions in wave-group focusing are regarded as one of the main mechanisms in the generation of destructive extreme waves. In real seas, the wideband bimodal state is a typical configuration, containing interactions within a single wave group and between different wave groups. The former has been well uncovered under the assumption of narrow bandwidth, but the latter is poorly understood. In this paper, physical experiments are conducted to reveal the physics of double-wave-group focusing considering various energy distributions. Superposed wavemaker signals generated by the iteration method are applied to produce a double-wave-group focusing with the interactions being decomposed. Results of the wavelet-based bicoherence spectrum show that double-wave-group focusing is distinguished from the linear superposition of two single-wave-group focusing mainly in the nonlinear interactions induced by the second-order sum harmonics. Under the assumption of equivalent energy, interactions of the second-order sum harmonics between the lower frequency group and higher frequency group cannot be ignored in swell-dominated states, and lesser linear interactions and stronger nonlinear interactions are observed while the spectral distribution of the double-wave-group is more asymmetrical. This work is anticipated to contribute to the understanding of the generation mechanism of extreme waves driven by strong nonlinearity.
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Liu, Mao, Haijie Yu et Ben Wang. « Tuning and controlling antiplane shear wave propagation in elastic membranes ». AIP Advances 12, no 8 (1 août 2022) : 085319. http://dx.doi.org/10.1063/5.0103469.

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In this paper, a rotary-focusing device for the antiplane shear wave is constructed to control and guide elastic wave energy transmission in elastic membranes. The designed device can cloak the antiplane shear waves outside the device and has a rotary-focusing effect on the shear waves energy inside the device in a membrane. The multilayered isotropic material properties of the rotary-focusing device are derived based on the transformation and rotary medium method, and a rotation parameter to guide the propagating trajectories of the antiplane shear waves is introduced. The efficiency of the rotary-focusing device for the antiplane shear waves is verified. The stability of shear wave fields in a membrane with the rotary-focusing device is analyzed to study the performance of rotary-focusing. Numerical examples show that the constructed rotary-focusing device for antiplane shear waves can effectively rotate and focus the antiplane shear wave energy into the device for a wide range of exciting frequencies, which can enhance the antiplane shear energy. Therefore, this study can provide theoretical support for potential applications in the fields of energy harvesting and vibration control.
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Vines, R. E., Shin-ichiro Tamura et J. P. Wolfe. « Surface Acoustic Wave Focusing and Induced Rayleigh Waves ». Physical Review Letters 74, no 14 (3 avril 1995) : 2729–32. http://dx.doi.org/10.1103/physrevlett.74.2729.

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Thèses sur le sujet "Focusing wave"

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Jendrej, Jacek. « On the dynamics of energy-critical focusing wave equations ». Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX029/document.

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Cette thèse est consacrée à l’étude du comportement global des solutions de l’équation des ondes énergie-critique. On s’intéresse tout spécialement à la description de la dynamique du système dans l’espace de l’énergie. Nous développons une variante de la méthode d’énergie qui permet de construire des solutions explosives de type II, instables. Ensuite, par une démarche similaire, nous donnons le premier exemple d’une solution radiale de l’équation des ondes énergie-critique qui converge dans l’espace de l’énergie vers une superposition de deux états stationnaires (bulles). En appliquant notre méthode au cas de l’équation des ondes des applications harmoniques (wave map), nous obtenons des solutions de type bulle-antibulle, en toute classe d’équivariance k > 2. Pour l’équation des ondes énergie-critique radiale, nous étudions également le lien entre la vitesse de l’explosion de type II et la limite faible de la solution au moment de l’explosion. Finalement, nous montrons qu’il est impossible qu’une solution radiale converge vers une superposition de deux bulles ayant les signes opposés
In this thesis we study the global behavior of solutions of the energy-criticalfocusing nonlinear wave equation, with a special emphasis on the description of the dynamics in the energy space. We develop a new approach, based on the energy method, to constructing unstable type II blow-up solutions. Next, we give the first example of a radial two-bubble solution of the energy-critical wave equation. By implementing this construction in the case of the equivariant wave map equation, we obtain bubble-antibubble solutions in equivariance classes k > 2. We also study the relationship between the speed of a type II blow-up and the weak limit of the solution at the blow-up time. Finally, we prove that there are no pure radial two-bubbles with opposite signs for the energy-critical wave equation
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Joubert, J. R. « An investigation of the wave energy resource on the South African Coast, focusing on the spatial distribution of the South West coast ». Thesis, Link to the Internet, 2008. http://hdl.handle.net/10019.1/351.

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Aydin, Baran. « Analytical Solutions Of Shallow-water Wave Equations ». Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613349/index.pdf.

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Analytical solutions for the linear and nonlinear shallow-water wave equations are developed for evolution and runup of tsunamis &ndash
long waves&ndash
over one- and two-dimensional bathymetries. In one-dimensional case, the nonlinear equations are solved for a plane beach using the hodograph transformation with eigenfunction expansion or integral transform methods under different initial conditions, i.e., earthquake-generated waves, wind set-down relaxation, and landslide-generated waves. In two-dimensional case, the linear shallow-water wave equation is solved for a flat ocean bottom for initial waves having finite-crest length. Analytical verification of source focusing is presented. The role of focusing in unexpectedly high tsunami runup observations for the 17 July 1998 Papua New Guinea and 17 July 2006 Java Island, Indonesia tsunamis are investigated. Analytical models developed here can serve as benchmark solutions for numerical studies.
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Kälvegren, Christian, et Tobias Sjölin. « Wave power - The future of energy supply ? Focusing on its sealing solutions ». Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209547.

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A new concept for extracting renewable power has been developed at KTH Electric Power and Energy Systems, this time regarding wave power. Unlike other wave energy converters this concepts generator opens up the possibility to be operative also during low speed and at the same time preserve high power density and efficiency. This solution needs to be sealed since its components don’t withstand the ambient environment; this is therefore the purpose of the project. Several problems exist with the sealing solutions that currently are available, that is why it exists a need to produce a custom sealing solution for this concept. Some of the problems are, for example, leakage and fatigue failure that lead to unacceptably short life expectancy. The issues discussed in the report and the project, are whether there are any loads acting on the seal that are specifically critical, if there is any way to easily reduce these, if there are any solutions that are denser than the current ones (which also have approved properties of strength and life expectancy as a result of the requirements imposed on them), if these solutions would be applicable in all seas and if these solutions are also economically applicable. To answer this, most conceptualizations have been conducted using brainstorming where potential solutions were evaluated based on the extensive information retrieval, to finally reach out and outline the most promising final concepts. These were then modeled using the 3D-modeling software Solid Edge to finally be analyzed using the Ansys software. The results and conclusions from both the search for information and the detailed analyzes were that the critical loads are stresses that arise from compression, expansion and bending of the buoy, which can be reduced by creating an inner structure in the seal which causes loads to occur more continuously. There are also sealing solutions that are completely dense as they enclose the part of the wave power concept that needs to be sealed, so-called gaiter solutions. In addition, these solutions are applicable in all seas, both from a material perspective, but also from a dimensioning one such as the possibility of adjusting the length of the seal during the manufacture along varying wave heights of where it is to be applied. Regarding the last question, which addresses economic applicability, no sufficiently accurate results could be generated and hence no conclusions could be drawn.
Ett nytt koncept för att utvinna förnyelsebar energi har framtagits på KTH Elkraftteknik, denna gång handlar det om vågkraft. Till skillnad från flera andra vågkraftverk så öppnar detta koncepts nyframtagna generator upp för möjligheten att vara verksamt även vid låga hastigheter samtidigt som det bibehåller hög krafttäthet samt verkningsgrad. Denna lösning av generatorn är i behov av att tätas då dess ingående komponenter inte tål den omgivande havsmiljön, detta är därför syftet med projektet som genomförts. Flertalet problem existerar med de lösningar som för nuvarande finns att tillgå, varför det finns behov av att ta fram en skräddarsydd tätningslösning till detta koncept. Dessa problem är exempelvis läckage och utmattningsbrott vilka leder till att livslängden hos tätningarna blir oacceptabelt kort. De frågeställningar vilka i rapporten och projektet behandlas är ifall det finns några belastningar verkande på tätningen som är specifikt kritiska, ifall det finns något enkelt sätt att reducera just dessa, ifall det finns några lösningar som är tätare än de som finns att tillgå idag (som också har godkända egenskaper gällande hållfasthet och livslängd till följd av de krav som ställs på dem), ifall dessa lösningar skulle vara applicerbara i alla hav och ifall dessa lösningar är ekonomiskt tillämpbara. För att besvara detta har flertalet konceptgenereringar utförts med hjälp av brainstorming där potentiella lösningar utvärderats baserat på en omfattande informationssökning, för att till sist komma fram till och skissera upp de mest lovande slutkoncepten. Dessa modellerades därefter upp med hjälp av 3D-modelleringsprogrammet Solid Edge för att slutligen analyseras med programvaran Ansys. Resultaten och slutsatserna från både informationssökningen och de utförliga analyserna var att de kritiska belastningarna är de spänningar vilka uppstår till följd av kompression, expansion och böjning av bojen, vilka kan reduceras genom att skapa en inre struktur i tätningen som leder till att belastningarna sker mer jämnt. Det finns även tätningslösningar vilka är helt täta då de inkapslar den del av vågkraftskonceptet som behöver tätas, så kallade damasklösningar. Dessa lösningar är dessutom applicerbara i alla hav både ur ett perspektiv gällande material men också ett dimensioneringsmässigt sådant, där möjligheten finns att justera tätningens längd vid tillverkningen utefter den varierande våghöjden där denna ska appliceras. Gällande den sista frågan vilken behandlar den ekonomiska tillämpbarheten kunde inga tillräckligt träffsäkra resultat genereras och därav inga slutsatser dras.
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Brouzet, Christophe. « Internal wave attractors : from geometrical focusing to non-linear energy cascade and mixing ». Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEN012/document.

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La cascade d’énergie qui a lieu dans les océans, depuis les grandes vers les petites échelles, est capitale pour comprendre leur dynamique et le mélange irréversible associé. Les attracteurs d’ondes internes font partie des mécanismes conduisant potentiellement à une telle cascade. Dans ce manuscrit, nous étudions expérimentalement les attracteurs d’ondes internes, dans une cuve trapézoïdale remplie d’un fluide stratifié linéairement en densité. Dans cette géométrie, les ondes peuvent être focalisées vers un cycle limite : l’attracteur. Nous montrons que la formation de l’attracteur est purement linéaire : des petites échelles sont donc créées grâce à la focalisation des ondes. Les principales caractéristiques de l’attracteur dépendent uniquement de la géométrie trapézoïdale de la cuve. A l’échelle de l’océan, nous montrons que les attracteurs d’ondes internes sont très probablement instables. En effet, ceux-ci sont sujets à une instabilité de résonance triadique, qui transfère de l’énergie depuis l’attracteur vers un couple d’ondes secondaires. Cette instabilité et ses principales caractéristiques sont décrites en fonction de la géométrie du bassin. Pour des expériences de longue durée, l’instabilité produit plusieurs paires d’ondes secondaires, créant une cascade d’instabilités triadiques et transférant l’énergie injectée à grandes échelles vers des échelles plus petites. Nous montrons, pour la première fois de façon expérimentale, de très fortes signatures de turbulence d’ondes internes. Au delà de cet état, la cascade atteint un régime de mélange partiel du fluide stratifié. Cet ultime régime apparait indépendant de la géométrie trapézoïdale du bassin, et donc, universel. Cette thèse est complétée par une étude sur la masse ajoutée et l’amortissement par émission d’ondes d’objets oscillant horizontalement dans un fluide stratifié en densité. Cela a des applications concernant la conversion de l’énergie des marées en ondes internes
A question of paramount importance in the dynamics of oceans is related to the energy cascade from large to small scales and its contribution to mixing. Internal wave attractors may be one of the possible mechanisms responsible for such a cascade. In this manuscript, we study experimentally internal wave attractors in a trapezoidal test tank filled with linearly stratified fluid. In such a geometry, the waves can form closed loops called attractors. We show that the attractor formation is purely linear: small scales are thus created by wave focusing. The attractor characteristics are found to only depend on the trapezoidal geometry of the tank. At the ocean scale, we show that attractors are very likely to be unstable. Indeed, internal wave attractors are prone to a triadic resonance instability, which transfers energy from the attractor to a pair of secondary waves. This instability and its main characteristics are described as a function of the geometry of the basin. For long-term experiments, the instability produces several pairs of secondary waves, creating a cascade of triadic interactions and transferring energy from large-scale monochromatic input to multi-scale internal-wave motion. We reveal, for the first time, experimental convincing signatures of internal wave turbulence. Beyond this cascade, we have a mixing regime, which appears to be independent of the trapezoidal geometry and, thus, universal. This manuscript is completed by a study on added mass and wave damping coefficient of bodies oscillating horizontally in a stratified fluid, with applications to tidal conversion
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Zhao, Ningxiner. « Design and Analysis of Piecewise Assembled, Reconfigurable Acoustic Arrays for Sound Wave Focusing ». The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586188427835977.

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Anthony, Brian W. 1972. « Anisotropic wave guides-- propagation, focusing and dispersive phenomena with applications for non-destructive testing ». Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50067.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
Includes bibliographical references (p. 60).
Acoustic Non-Destructive Testing (NDT) has a long history of applications in fatigue monitoring, fault testing, and more recently production control. A very large family of manufactured and raw materials consist of thin layers. Some examples include rolled aluminum, window glass, plywood, automobile bodies, plane wings, silicon wafers, bridge support beams, and paper. These layers can be viewed and modeled as acoustic waveguides. This thesis will present the framework in which to analyze such layers. To this end, analytic solutions to the plane wave displacement and stress fields in a single layer monoclinic material will be presented The propagation, frequency, and dispersive characteristics of transmitted signals can be analyzed to determine various elastic properties of the layer or to identify faults. Wavelet (time-frequency), Fourier (frequency), and signal matching (time) techniques will be developed to analyze and extract features and properties of signals. Several experimental examples will be presented.
S.M.
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Blackhurst, Tyler D. « Numerical Investigation of Internal Wave-Vortex Dipole Interactions ». BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3133.

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Three-dimensional linear ray theory is used to investigate internal waves interacting with a Lamb-Chaplygin pancake vortex dipole. These interactions involve waves propagating in the same (co-propagating) and opposite (counter-propagating) horizontal directions as the dipole translation. Co-propagating internal waves in the vertical symmetry plane between the vortices of the dipole can approach critical levels where the wave energy is absorbed by the dipole or where the waves are overturned and possibly break. As wave breaking cannot be simulated with this linear model, changes in wave steepness are calculated to aid in estimating the onset of breaking. Counter-propagating internal waves in the vertical symmetry plane can experience horizontal and vertical reflections, including turning points similar to waves in two-dimensional steady shear. Wave capture is also a possible effect of either type of interaction, depending on initial wave properties and positioning relative to the vortex dipole. Away from the vertical symmetry plane, a spanwise converging (focusing) and diverging (defocusing) of wave energy is observed in co- and counter-propagating interactions as symmetric off-center rays interact with the dipole's individual vortices. Some off-center rays experience multiple horizontal refractions similar to wave trapping.
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Srinivas, Vivek. « Adaptive, Wave Guiding Acoustic Arrays using Circularly Symmetric Reconfigurable Structures ». The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587130205893861.

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Cajko, Frantisek. « Nano-Focusing of Light : Electromagnetic Analysis and Simulation ». University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1249331504.

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Livres sur le sujet "Focusing wave"

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Sulem, C. The nonlinear Schrödinger equation : Self-focusing and wave collapse. New York : Springer, 1999.

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Sulem, Catherine, et Pirre-Louis Sulem, dir. The Nonlinear Schrödinger Equation : Self-Focusing and Wave Collapse. New York, NY : Springer New York, 2004. http://dx.doi.org/10.1007/b98958.

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Sulem, C. The nonlinear Schrödinger equation : Self-focusing and wave collapse. New York : Springer, 1999.

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4

T, Smith F., et Langley Research Center, dir. Near-planar TS waves and longitudinal vortices in channel flow : Nonlinear interaction and focusing. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1989.

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T, Smith F., et Langley Research Center, dir. Near-planar TS waves and longitudinal vortices in channel flow : Nonlinear interaction and focusing. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1989.

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Hall, P. Near-planar TS waves and longitudinal vortices in channel flow : Nonlinear interaction and focusing. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1989.

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Nye, J. F. Natural focusing and fine structure of light : Caustics and wave dislocations. Bristol : Institute of Physics Pub., 1999.

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Kamvissis, Spyridon. Semiclassical soliton ensembles for the focusing nonlinear Schrödinger equation. Princeton, N.J : Princeton University Press, 2003.

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T-R, McLaughlin Kenneth D., et Miller Peter D, dir. Semiclassical soliton ensembles for the focusing nonlinear Schrödinger equation. Princeton, N.J : Princeton University Press, 2003.

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Sousa, Carole. W.A.V.E. : Wave of Asian voices emerging : a prevention curriculum for Asian youth focusing on relationships and violence. Boston : Asian Task Force Against Domestic Violence, 2003.

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Chapitres de livres sur le sujet "Focusing wave"

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Healy, Terry R. « Wave Focusing ». Dans Encyclopedia of Earth Sciences Series, 1858–59. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-93806-6_346.

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Healy, Terry R. « Wave Focusing ». Dans Encyclopedia of Earth Sciences Series, 1–2. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-48657-4_346-2.

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Ritchie, William, Katherine Pond, Edward J. Anthony, George Maul, Patricia L. Wiberg, Miles O. Hayes, Andrew D. Short et al. « Wave Focusing ». Dans Encyclopedia of Coastal Science, 1059–60. Dordrecht : Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3880-1_346.

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Sasoh, Akihiro. « Laser Focusing ». Dans Experimental Methods of Shock Wave Research, 99–108. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23745-9_4.

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Takayama, Kazuyoshi. « Shock Wave Focusing in Gases ». Dans Visualization of Shock Wave Phenomena, 281–360. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19451-2_5.

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Deutsch, W. A. K., A. Cheng et J. D. Achenbach. « Self-Focusing Surface Wave Array ». Dans Review of Progress in Quantitative Nondestructive Evaluation, 2077–84. Boston, MA : Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5947-4_271.

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Kenig, Carlos. « The Focusing Energy-Critical Wave Equation ». Dans Harmonic Analysis, Partial Differential Equations and Applications, 97–107. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52742-0_7.

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Apazidis, Nicholas, et Veronica Eliasson. « Shock Focusing in Nature and Medicine ». Dans Shock Wave and High Pressure Phenomena, 145–58. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75866-4_4.

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Schober, C. M. « Nonlinear Focusing and Rogue Waves in Deep Water ». Dans Mathematical and Numerical Aspects of Wave Propagation WAVES 2003, 735–40. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55856-6_119.

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Yamamoto, Hiroaki, et Kazuyoshi Takayama. « Medical Application of Miniaturized Underwater Shock Wave Focusing ». Dans Frontiers of Shock Wave Research, 133–45. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90735-8_8.

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Actes de conférences sur le sujet "Focusing wave"

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Ramm, A. G. « Creating wave-focusing materials ». Dans 2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED). IEEE, 2008. http://dx.doi.org/10.1109/diped.2008.4671797.

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Hayashi, Takahiro, Koichiro Kawashima, Zongqi Sun et Joseph L. Rose. « Guided Wave Focusing Mechanics in Pipe ». Dans ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1850.

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Guided waves can be used in pipe inspection over long distances. Presented in this paper is a beam focusing technique to improve the S/N ratio of the reflection from a tiny defect. Focusing is accomplished by using non-axisymmetric waveforms and subsequent time delayed superposition at a specific point in a pipe. A semi-analytical finite element method is used to present wave structure in the pipe. Focusing potential is also studied with various modes and frequencies.
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Schmittner, Christian, Joris Brouwer et Janou Hennig. « Application of Focusing Wave Groups in Model Testing Practice ». Dans ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23949.

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For hydrodynamic model testing different types of model waves are applied, where the most common ones are regular (monochromatic) and irregular (multichromatic) waves. In addition to these wave types the application of focusing wave groups, which are also often denoted as wave packages or transient wave packets, can give insight into aspects that cannot be assessed by the conventional model waves. This paper describes the different applications of focusing wave groups for hydrodynamic model testing. The paper starts with the historical background, followed by a theoretical description and the generation procedure. The main part of the paper is dedicated to the practical application of focusing wave groups in the basin. Items that will be described are a) the derivation of transfer functions for floating structures and for anti-roll tanks b) the determination of hydraulic and electrical transfer function of wave makers c) the verification of position and calibration of wave probes in the basin d) the generation of extreme wave events e) the assessment of reflection coefficient of beaches f) the investigation of non-linear aspects of transfer functions. Finally, characteristics of the analysis of focusing waves are introduced and compared to conventional methods based on regular and irregular waves.
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Wang, J., S. M. Calisal, J. Mikkelsen et S. Zealand. « The Wave Focusing Effect of a Parabolic Wall ». Dans ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51073.

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The energy generation efficiency of a wave energy conversion system is in general proportional to the capacity of wave energy capture of the system. In various wave energy conversion systems, a configuration with parabolic shape has shown advantages in wave capture dynamics. This paper presents an experimental investigation into the wave focusing and elevation in a parabolic wall area with a Laser Wave Height Measurement equipment named as IVP Ranger SC386. In the experiment, the tested waves were described by a dimensionless factor WF which consists of wave parameters and the parabolic wall size. The WF increases with wave relative size to the model. The tested wave obliquities to the parabolic wall were 10 and 20 degrees in addition to the normal incident waves. A tube with an inner diameter 7.5cm, representing a chamber for oscillatory water columns compressing air, was mounted at the focus area. The elevations of wave height inside the tube with a sealed and an open top, as two different cases, were also measured. Furthermore the wave forces acting on the parabolic wall were measured using load cells. The analysis of the experimental results revealed that the parabolic wall was able to significantly elevate wave heights by up to 2.5 times. Within 10 degrees the wave obliquity effect can be neglected for both forces acting on the parabolic wall and wave height elevated by the parabolic wall. A prediction equation for focusing wave height was developed from the experimental results and the parabolic focusing principle.
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Ura, Shogo, Hiroshi Sunagawa, Toshiaki Suhara et Hiroshi Nishihara. « A Focusing Grating Coupler for Polarization Detection ». Dans Integrated and Guided Wave Optics. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.mc6.

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A focusing grating coupler (FGC) is an attractive component in integrated optics, since it operates for both lens and waveguide-air interface. By using the FGCs, we reported several integrated-optic devices such as integrated-optic disk pickup [1]. In this paper, we propose and demonstrate a novel FGC having polarization detection function. This FGC is the key component for optical integration of magneto-optical (MO) disk pickup.
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Isernia, T., D. A. M. Iero, A. F. Morabito et L. Crocco. « Optimal wave focusing in complex environments ». Dans 2016 17th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM). IEEE, 2016. http://dx.doi.org/10.1109/antem.2016.7550237.

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Bazargani, Farhad, et Roel Snieder. « Optimal wave focusing in elastic media ». Dans SEG Technical Program Expanded Abstracts 2014. Society of Exploration Geophysicists, 2014. http://dx.doi.org/10.1190/segam2014-0635.1.

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Higginbotham, Joseph H., Morgan P. Brown et Robert G. Clapp. « Wave equation migration velocity focusing analysis ». Dans SEG Technical Program Expanded Abstracts 2008. Society of Exploration Geophysicists, 2008. http://dx.doi.org/10.1190/1.3063985.

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Brandini, Carlo, et Stéphan T. Grilli. « Three-Dimensional Wave Focusing in Fully Nonlinear Wave Models ». Dans Fourth International Symposium on Ocean Wave Measurement and Analysis. Reston, VA : American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40604(273)112.

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Sato, Hiroyasu, Kevin Kipruto Mutai et Qiang Chen. « Bistatic Millimeter-Wave Imaging Using Leaky-Wave Focusing Antennas ». Dans 2022 International Symposium on Antennas and Propagation (ISAP). IEEE, 2022. http://dx.doi.org/10.1109/isap53582.2022.9998807.

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Rapports d'organisations sur le sujet "Focusing wave"

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Rose, Joseph L., et Li Zhang. High Frequency Guided Wave Phased Array Focusing in Pipe. Fort Belvoir, VA : Defense Technical Information Center, décembre 2005. http://dx.doi.org/10.21236/ada444978.

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Esarey, E., A. Ting et P. Sprangle. Relativistic Focusing and Beat Wave Phase Velocity Control in the Plasma Beat Wave Accelerator. Fort Belvoir, VA : Defense Technical Information Center, septembre 1988. http://dx.doi.org/10.21236/ada200399.

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Mikhail, Dorf A., Igor D. Kaganovich, Edward A. Startsev et Ronald C. Davidson. Whistler Wave Excitation and Effects of Self-Focusing on Ion Beam Propagation through a Background Plasma along a Solenoidal Magnetic Field. Office of Scientific and Technical Information (OSTI), février 2010. http://dx.doi.org/10.2172/973083.

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Edwards, M. Referee's report on Blast-wave diagnosis of self-focusing of an intense laser pulse in a cluster medium, by Symes et al. Office of Scientific and Technical Information (OSTI), novembre 2006. http://dx.doi.org/10.2172/1036857.

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Ghislandi, Simone, Raya Muttarak, Markus Sauerberg et Benedetta Scotti. Human costs of the first wave of the COVID-19 pandemic in the major epicentres in Italy. Verlag der Österreichischen Akademie der Wissenschaften, juillet 2021. http://dx.doi.org/10.1553/populationyearbook2022.res2.1.

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Deaths from COVID-19 can be miscounted due to under-reporting and inaccurate death registration. Mortality is often reported at the national level, which can result in the underestimation of the true scale of the impact of the pandemic since outbreaks tend to be localised. This study exploits all-cause daily death registration data provided by the Italian Statistical Office (ISTAT) from 1 January to 31 October to estimate the excess mortality and the corresponding changes in life expectancy during the first wave of the COVID-19 pandemic. Focusing on the five most severely hit provinces in Italy (Bergamo, Brescia, Cremona, Lodi and Piacenza), we calculate the excess mortality in 2020 compared to the average mortality of the years 2015 to 2019. Moreover, we estimate the excess mortality in the first quadrimester of 2020, and the annual life expectancy at birth. The estimated excess deaths show that during this period, mortality was significantly higher than the official mortality statistics for COVID-19. According to our estimates for the first quadrimester, life expectancy in the five provinces declined by 5.4 to 8.1 for men and by 4.1 to 5.8 years for women. In addition, we find that annual life expectancy decreased by 2.4 to 4.1 years for men and by 1.9 to 2.8 years for women compared to the 2015–2019 average. Thus, we conclude that the first wave of the COVID-19 pandemic had a substantial impact on population health in the hardest hit areas in Italy.
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Amatuni, A. Ts, S. S. Elbakian et E. V. Sekhpossian. Coulomb field effect on plasma focusing and wake field acceleration. Office of Scientific and Technical Information (OSTI), novembre 1993. http://dx.doi.org/10.2172/10112471.

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Ferguson, Thomas, Paul Jorgensen et Jie Chen. The Knife Edge Election of 2020 : American Politics Between Washington, Kabul, and Weimar. Institute for New Economic Thinking Working Paper Series, novembre 2021. http://dx.doi.org/10.36687/inetwp169.

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This paper analyzes the 2020 election, focusing on voters, not political money, and emphasizing the importance of economic geography. Drawing extensively on county election returns, it analyzes how spatial factors combined with industrial structures to shape the outcome. It treats COVID 19’s role at length. The paper reviews studies suggesting that COVID 19 did not matter much, but then sets out a new approach indicating it mattered a great deal. The study analyzes the impact on the vote not only of unemployment but differences in income and industry structures, along with demographic factors, including religion, ethnicity, and race. It also studies how the waves of wildcat strikes and social protests that punctuated 2020 affected the vote in specific areas. Trump’s very controversial trade policies and his little discussed farm policies receive detailed attention. The paper concludes with a look at how political money helped make the results of the Congressional election different from the Presidential race. It also highlights the continuing importance of private equity and energy sectors opposed to government action to reverse climate change as conservative forces in (especially) the Republican Party, together with agricultural interests.
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Gregow, Hilppa, Antti Mäkelä, Heikki Tuomenvirta, Sirkku Juhola, Janina Käyhkö, Adriaan Perrels, Eeva Kuntsi-Reunanen et al. Ilmastonmuutokseen sopeutumisen ohjauskeinot, kustannukset ja alueelliset ulottuvuudet. Suomen ilmastopaneeli, 2021. http://dx.doi.org/10.31885/9789527457047.

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The new EU strategy on adaptation to climate change highlights the urgency of adaptation measures while bringing forth adaptation as vitally important as a response to climate change as mitigation. In order to provide information on how adaptation to climate change has been promoted in Finland and what calls for attention next, we have compiled a comprehensive information package focusing on the following themes: adaptation policy, impacts of climate change including economic impacts, regional adaptation strategies, climate and flood risks in regions and sea areas, and the availability of scientific data. This report consists of two parts. Part 1 of the report examines the work carried out on adaptation in Finland and internationally since 2005, emphasising the directions and priorities of recent research results. The possibilities of adaptation governance are examined through examples, such as how adaptations steering is organised in of the United Kingdom. We also examine other examples and describe the Canadian Climate Change Adaptation Platform (CCAP) model. We apply current information to describe the economic impacts of climate change and highlight the related needs for further information. With regard to regional climate strategy work, we examine the status of adaptation plans by region and the status of the Sámi in national adaptation work. In part 2 of the report, we have collected information on the temporal and local impacts of climate change and compiled extensive tables on changes in weather, climate and marine factors for each of Finland's current regions, the autonomous Åland Islands and five sea areas, the eastern Gulf of Finland, the western Gulf of Finland, the Archipelago Sea, the Bothnian Sea and the Bay of Bothnia. As regards changes in weather and climate factors, the changes already observed in 1991-2020 are examined compared to 1981-2010 and future changes until 2050 are described. For weather and climate factors, we examine average temperature, precipitation, thermal season duration, highest and lowest temperatures per day, the number of frost days, the depth and prevalence of snow, the intensity of heavy rainfall, relative humidity, wind speed, and the amount of frost per season (winter, spring, summer, autumn). Flood risks, i.e. water system floods, run-off water floods and sea water floods, are discussed from the perspective of catchment areas by region. The impacts of floods on the sea in terms of pollution are also assessed by sea area, especially for coastal areas. With regard to marine change factors, we examine surface temperature, salinity, medium water level, sea flood risk, waves, and sea ice. We also describe combined risks towards sea areas. With this report, we demonstrate what is known about climate change adaptation, what is not, and what calls for particular attention. The results can be utilised to strengthen Finland's climate policy so that the implementation of climate change adaptation is strengthened alongside climate change mitigation efforts. In practice, the report serves the reform of the National Climate Change Adaptation Plan and the development of steering measures for adaptation to climate change both nationally and regionally. Due to its scale, the report also serves e.g. the United Nations’ aim of protecting marine life in the Baltic Sea and the national implementation of the EU strategy for adaptation to climate change. As a whole, the implementation of adaptation policy in Finland must be speeded up swiftly in order to achieve the objectives set and ensure sufficient progress in adaptation in different sectors. The development of binding regulation and the systematic evaluation, monitoring and support of voluntary measures play a key role.
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