Bibliographies thématiques / Internal wave field

Littérature scientifique sur le sujet « Internal wave field »

Auteur : Grafiati
Publié le 4 mai 2024

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Articles de revues sur le sujet "Internal wave field"

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Meyer, Amelie, Kurt L. Polzin, Bernadette M. Sloyan et Helen E. Phillips. « Internal Waves and Mixing near the Kerguelen Plateau ». Journal of Physical Oceanography 46, no 2 (février 2015) : 417–37. http://dx.doi.org/10.1175/jpo-d-15-0055.1.

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AbstractIn the stratified ocean, turbulent mixing is primarily attributed to the breaking of internal waves. As such, internal waves provide a link between large-scale forcing and small-scale mixing. The internal wave field north of the Kerguelen Plateau is characterized using 914 high-resolution hydrographic profiles from novel Electromagnetic Autonomous Profiling Explorer (EM-APEX) floats. Altogether, 46 coherent features are identified in the EM-APEX velocity profiles and interpreted in terms of internal wave kinematics. The large number of internal waves analyzed provides a quantitative framework for characterizing spatial variations in the internal wave field and for resolving generation versus propagation dynamics. Internal waves observed near the Kerguelen Plateau have a mean vertical wavelength of 200 m, a mean horizontal wavelength of 15 km, a mean period of 16 h, and a mean horizontal group velocity of 3 cm s−1. The internal wave characteristics are dependent on regional dynamics, suggesting that different generation mechanisms of internal waves dominate in different dynamical zones. The wave fields in the Subantarctic/Subtropical Front and the Polar Front Zone are influenced by the local small-scale topography and flow strength. The eddy-wave field is influenced by the large-scale flow structure, while the internal wave field in the Subantarctic Zone is controlled by atmospheric forcing. More importantly, the local generation of internal waves not only drives large-scale dissipation in the frontal region but also downstream from the plateau. Some internal waves in the frontal region are advected away from the plateau, contributing to mixing and stratification budgets elsewhere.
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Morozov, Eugene G. « Semidiurnal internal wave global field ». Deep Sea Research Part I : Oceanographic Research Papers 42, no 1 (janvier 1995) : 135–48. http://dx.doi.org/10.1016/0967-0637(95)92886-c.

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Varma, Dheeraj, Manikandan Mathur et Thierry Dauxois. « Instabilities in internal gravity waves ». Mathematics in Engineering 5, no 1 (2022) : 1–34. http://dx.doi.org/10.3934/mine.2023016.

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<abstract><p>Internal gravity waves are propagating disturbances in stably stratified fluids, and can transport momentum and energy over large spatial extents. From a fundamental viewpoint, internal waves are interesting due to the nature of their dispersion relation, and their linear dynamics are reasonably well-understood. From an oceanographic viewpoint, a qualitative and quantitative understanding of significant internal wave generation in the ocean is emerging, while their dissipation mechanisms are being debated. This paper reviews the current knowledge on instabilities in internal gravity waves, primarily focusing on the growth of small-amplitude disturbances. Historically, wave-wave interactions based on weakly nonlinear expansions have driven progress in this field, to investigate spontaneous energy transfer to various temporal and spatial scales. Recent advances in numerical/experimental modeling and field observations have further revealed noticeable differences between various internal wave spatial forms in terms of their instability characteristics; this in turn has motivated theoretical calculations on appropriately chosen internal wave fields in various settings. After a brief introduction, we present a pedagogical discussion on linear internal waves and their different two-dimensional spatial forms. The general ideas concerning triadic resonance in internal waves are then introduced, before proceeding towards instability characteristics of plane waves, wave beams and modes. Results from various theoretical, experimental and numerical studies are summarized to provide an overall picture of the gaps in our understanding. An ocean perspective is then given, both in terms of the relevant outstanding questions and the various additional factors at play. While the applications in this review are focused on the ocean, several ideas are relevant to atmospheric and astrophysical systems too.</p></abstract>
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Lelong, M. P., et E. Kunze. « Can barotropic tide–eddy interactions excite internal waves ? » Journal of Fluid Mechanics 721 (13 mars 2013) : 1–27. http://dx.doi.org/10.1017/jfm.2013.1.

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AbstractThe interaction of barotropic tidal currents and baroclinic geostrophic eddies is considered theoretically and numerically to determine whether energy can be transferred to an internal wave field by this process. The eddy field evolves independently of the tide, suggesting that it acts catalytically in facilitating energy transfer from the barotropic tide to the internal wave field, without exchanging energy with the other flow components. The interaction is identically zero and no waves are generated when the barotropic tidal current is horizontally uniform. Optimal internal wave generation occurs when the scales of tide and eddy fields satisfy resonant conditions. The most efficient generation is found if the tidal current horizontal scale is comparable to that of the eddies, with a weak maximum when the scales differ by a factor of two. Thus, this process is not an effective mechanism for internal wave excitation in the deep ocean, where tidal current scales are much larger than those of eddies, but it may provide an additional source of internal waves in coastal areas where horizontal modulation of the tide by topography can be significant.
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Cusack, Jesse M., J. Alexander Brearley, Alberto C. Naveira Garabato, David A. Smeed, Kurt L. Polzin, Nick Velzeboer et Callum J. Shakespeare. « Observed Eddy–Internal Wave Interactions in the Southern Ocean ». Journal of Physical Oceanography 50, no 10 (1 octobre 2020) : 3043–62. http://dx.doi.org/10.1175/jpo-d-20-0001.1.

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AbstractThe physical mechanisms that remove energy from the Southern Ocean’s vigorous mesoscale eddy field are not well understood. One proposed mechanism is direct energy transfer to the internal wave field in the ocean interior, via eddy-induced straining and shearing of preexisting internal waves. The magnitude, vertical structure, and temporal variability of the rate of energy transfer between eddies and internal waves is quantified from a 14-month deployment of a mooring cluster in the Scotia Sea. Velocity and buoyancy observations are decomposed into wave and eddy components, and the energy transfer is estimated using the Reynolds-averaged energy equation. We find that eddies gain energy from the internal wave field at a rate of −2.2 ± 0.6 mW m−2, integrated from the bottom to 566 m below the surface. This result can be decomposed into a positive (eddy to wave) component, equal to 0.2 ± 0.1 mW m−2, driven by horizontal straining of internal waves, and a negative (wave to eddy) component, equal to −2.5 ± 0.6 mW m−2, driven by vertical shearing of the wave spectrum. Temporal variability of the transfer rate is much greater than the mean value. Close to topography, large energy transfers are associated with low-frequency buoyancy fluxes, the underpinning physics of which do not conform to linear wave dynamics and are thereby in need of further research. Our work suggests that eddy–internal wave interactions may play a significant role in the energy balance of the Southern Ocean mesoscale eddy and internal wave fields.
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Broutman, D., et R. Grimshaw. « The energetics of the interaction between short small-amplitude internal waves and inertial waves ». Journal of Fluid Mechanics 196 (novembre 1988) : 93–106. http://dx.doi.org/10.1017/s0022112088002629.

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The interaction between a wave packet of small-amplitude short internal waves, and a finite-amplitude inertial wave field is described to second order in the short-wave amplitude. The discussion is based on the principle of wave action conservation and the equations for the wave-induced Lagrangian mean flow. It is demonstrated that as the short internal waves propagate through the inertial wave field they generate a wave-induced train of trailing inertial waves. The contribution of this wave-induced mean flow to the total energy balance is described. The results obtained here complement the finding of Broutman & Young (1986) that the short internal waves undergo a net change in energy after their encounter with the inertial wave field.
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MERCIER, MATTHIEU J., DENIS MARTINAND, MANIKANDAN MATHUR, LOUIS GOSTIAUX, THOMAS PEACOCK et THIERRY DAUXOIS. « New wave generation ». Journal of Fluid Mechanics 657 (19 juillet 2010) : 308–34. http://dx.doi.org/10.1017/s0022112010002454.

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We present the results of a combined experimental and numerical study of the generation of internal waves using the novel internal wave generator design of Gostiaux et al. (Exp. Fluids, vol. 42, 2007, pp. 123–130). This mechanism, which involves a tunable source composed of oscillating plates, has so far been used for a few fundamental studies of internal waves, but its full potential is yet to be realized. Our study reveals that this approach is capable of producing a wide variety of two-dimensional wave fields, including plane waves, wave beams and discrete vertical modes in finite-depth stratifications. The effects of discretization by a finite number of plates, forcing amplitude and angle of propagation are investigated, and it is found that the method is remarkably efficient at generating a complete wave field despite forcing only one velocity component in a controllable manner. We furthermore find that the nature of the radiated wave field is well predicted using Fourier transforms of the spatial structure of the wave generator.
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Didenkulova, Ekaterina, et Efim Pelinovsky. « Interaction Features of Internal Wave Breathers in a Stratified Ocean ». Fluids 5, no 4 (10 novembre 2020) : 205. http://dx.doi.org/10.3390/fluids5040205.

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Oscillating wave packets (breathers) are a significant part of the dynamics of internal gravity waves in a stratified ocean. The formation of these waves can be provoked, in particular, by the decay of long internal tidal waves. Breather interactions can significantly change the dynamics of the wave fields. In the present study, a series of numerical experiments on the interaction of breathers in the frameworks of the etalon equation of internal waves—the modified Korteweg–de Vries equation (mKdV)—were conducted. Wave field extrema, spectra, and statistical moments up to the fourth order were calculated.
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Feng, Jiabao, et Yang Song. « Effect of underwater vehicle wake on sound propagation characteristics in stratified medium ». Journal of Physics : Conference Series 2718, no 1 (1 mars 2024) : 012077. http://dx.doi.org/10.1088/1742-6596/2718/1/012077.

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Abstract Due to the uneven distribution of seawater temperature and salinity, the density distribution at different depths is different, thus forming a density step layer with a certain gradient. Acquiring the wake internal wave field generated by underwater vehicles passing through this layered structure and mastering its modulation characteristics for the sound field can provide new technical support for the tracking and identification of underwater vehicles. In this paper, the real size model of a certain type of underwater vehicle is taken as the research object to explore the characteristics of its wake internal wave field, and the influence of navigation parameters on the wake field and the change of winning characteristics under the influence of internal waves are simulated and analyzed. The results show that the navigation parameters of underwater vehicles have obvious influence on the wake field, and then have specific influence on the sound field structure in a certain range, especially on the sound signal of the sound field.
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HORN, D. A., L. G. REDEKOPP, J. IMBERGER et G. N. IVEY. « Internal wave evolution in a space–time varying field ». Journal of Fluid Mechanics 424 (16 novembre 2000) : 279–301. http://dx.doi.org/10.1017/s0022112000001841.

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An extended Korteweg–de Vries (KdV) equation is derived that describes the evolution and propagation of long interfacial gravity waves in the presence of a strong, space–time varying background. Provision is made in the derivation for a spatially varying lower depth so that some topographic effects can also be included. The extended KdV model is applied to some simple scenarios in basins of constant and varying depths, using approximate expressions for the variable coefficients derived for the case when the background field is composed of a moderate-amplitude ultra-long wave. The model shows that energy can be transferred either to or from the evolving wave packet depending on the relative phases of the evolving waves and the background variation. Comparison of the model with laboratory experiments confirms its applicability and usefulness in examining the evolution of weakly nonlinear waves in natural systems where the background state is rarely uniform or steady.
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Thèses sur le sujet "Internal wave field"

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Tate, Peter Michael School of Mathematics UNSW. « The rise and dilution of buoyant jets and their behaviour in an internal wave field ». Awarded by:University of New South Wales. School of Mathematics, 2002. http://handle.unsw.edu.au/1959.4/19301.

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A new buoyant jet model is presented in this thesis to simulate the trajectory and dilution of a fluid from a single port or line source. The new features include: A generalised derivation of the governing equations so that buoyant jets discharged from a source of any shape can be modelled within the one framework, and the effects of high-frequency internal waves on the motion of the buoyant jet. Past buoyant jet models were constructed for specific cases and their application is necessarily restricted. In this thesis, a new model is developed in a Lagrangian framework that can be applied to buoyant jet discharges at any angle into ambient waters that may be stratified or unstratified, flowing or stagnant. The model is validated using both laboratory and field data. Furthermore, the model is applicable to the continuous discharge of a buoyant jet from line, axisymmetric or elliptic sources and to the instantaneous discharge of a spherical puff. No previously published model is capable of unifying and solving all of these problems within the one framework. Transforming the governing equations to their non-dimensional form shows that the trajectory and dilution of discharges from line or axisymmetric sources or of spherical puffs into a flowing, stratified ambient environment are uniquely specified using three parameters. These are: the non-dimensional size of the outlet port, the relative importance of the initial fluxes of momentum and buoyancy, and the number of orthogonal planes through which entrainment can occur. This is a significant advance in the understanding of the processes affecting buoyant jets. When high-frequency internal waves are present in the receiving waters they can have significant effects on the buoyant jet. These effects are incorporated into the present model. Using data obtained from an experiment conducted off Sydney the effects of internal waves on the height of rise and dilution of the buoyant jet were found to exceed a factor of two. Consequently, it is important that the effects of internal waves (when present) be incorporated into any buoyant jet model.
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Kim, Won-Gyu 1962. « A Study of Nonlinear Dynamics in an Internal Water Wave Field in a Deep Ocean ». Thesis, University of North Texas, 1996. https://digital.library.unt.edu/ark:/67531/metadc278092/.

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The Hamiltonian of a stably stratified incompressible fluid in an internal water wave in a deep ocean is constructed. Studying the ocean internal wave field with its full dynamics is formidable (or unsolvable) so we consider a test-wave Hamiltonian to study the dynamical and statistical properties of the internal water wave field in a deep ocean. Chaos is present in the internal test-wave dynamics using actual coupling coefficients. Moreover, there exists a certain separatrix net that fills the phase space and is covered by a thin stochastic layer for a two-triad pure resonant interaction. The stochastic web implies the existence of diffusion of the Arnold type for the minimum dimension of a non-integrable autonomous system. For non-resonant case, stochastic layer is formed where the separatrix from KAM theory is disrupted. However, the stochasticity does not increase monotonically with increasing energy. Also, the problem of relaxation process is studied via microscopic Hamiltonian model of the test-wave interacting nonlinearly with ambient waves. Using the Mori projection technique, the projected trajectory of the test-wave is transformed to a form which corresponds to a generalized Langevin equation. The mean action of the test-wave grows ballistically for a short time regime, and quenches back to the normal diffusion for a intermediate time regime and regresses linearly to a state of statistical equilibrium. Applying the Nakajima-Zwanzig technique on the test-wave system, we get the generalized master equation on the test-wave system which is non-Markovian in nature. From our numerical study, the distribution of the test-wave has non-Gaussian statistics.
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Huda, Gazi Mostafa. « EFFECT OF A SILICON TIP ON ABSORPTION CROSS SECTION, FIELD ENHANCEMENT, AND LOCALIZED SURFACE PLASMON RESONANCE OF DIFFERENT SIZED GOLD NANOPARTICLES UNDER EVANESCENT WAVE ILLUMINATION ». UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_theses/114.

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We have numerically investigated the influence of a nanoscale silicon tip in proximity to an illuminated gold nanoparticle. We describe how the position of the high-permittivity tip and the size of a nanoparticle impact the absorption, peak electric field and surface plasmon resonance wavelength under different illumination conditions. We detail the finite element method (FEM) approach we have used for this, whereby we specify a volume excitation field analytically and calculate the difference between this source field and the total field (i.e., scattered-field formulation). We show that a nanoscale tip can locally enhance the absorption of the particle as well as the peak electric field at length scales far smaller than the wavelength of the incident light.
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Saidi, Sasan John. « Experimental investigation of 2D and 3D internal wave fields ». Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67799.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 113-116).
The generation of 2D and 3D internal wave fields is extensively studied via planarand stereo- Particle Image Velocimetry (PIV) flow field measurement techniques. A benchmark was provided by an experiment involving tidal flow over a 2D Gaussian ridge; this study providing a counterpart with which studies of a 3D incised Gaussian ridge could be compared with. To further benchmark the 3D wave field studies an experiment involving the canonical setup of a vertically oscillating sphere was performed and the results compared with the latest theory; the excellent agreement obtained provided confidence in the stereo-PIV method for studying fully three-dimensional internal waves. The 3D incised Gaussian ridge generates a wave field characterized by noticeable, though weak, out-of-plane forcing that evolves from a relatively strong to a weakly localized quantity as the wave field transitions from super- to subcritical, while the in-plane velocity field appears nearly identical to its 2D counterpart.
by Sasan John Saidi.
S.M.
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Shah, Suhani Kiran. « Modeling scattered intensity from microspheres in evanescent field ». Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2021.

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Akiyama, Shinsaku. « Measurement of the flow past a sphere descending at a constant speed in a salt stratified fluid ». Kyoto University, 2018. http://hdl.handle.net/2433/235086.

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Tombul, Serdar. « A numerical study of the validity regimes of weak fluctuation theory for ocean acoustic propagation through random internal wave sound speed fields ». Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion.exe/07Mar%5FTombul.pdf.

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Thesis (M.S. in Engineering Acoustics and M.S. in Electrical Engineering)--Naval Postgraduate School, March 2007.
Thesis Advisor(s): John Colosi. "March 2007." Includes bibliographical references (p. 81-82 ). Also available in print.
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Largeron, Yann. « Dynamique de la couche limite atmosphérique stable en relief complexe : application aux épisodes de pollution particulaire des vallées alpines ». Phd thesis, Grenoble, 2010. http://www.theses.fr/2010GRENU032.

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L'étude se concentre sur l'analyse de la dynamique de la Couche Limite Atmosphérique stable et hivernale en vallée, notamment dans des situations conduisant à des épisodes de pollution particulaire. L'analyse est effectuée à partir de simulations numériques de type LES et de mesures locales. Dans une première partie, on étudie les vents catabatiques prenant naissance sur les pentes des vallées encaissées. On montre qu'ils sont instationnaires, inhomogènes et turbulents, que leur diffusivité turbulente évolue quadratiquement avec le nombre de Froude et décroît avec la stratification ambiante. On s'intéresse ensuite au champ d'ondes internes généré par ces vents. On trouve que sa fréquence ne dépend que de la stratification et est indépendante des caractéristiques des vents qui lui donnent naissance. Dans une seconde partie, on s'intéresse au système de vents de vallées et aux inversions thermiques dans les vallées Grenobloises. Les conditions météorologiques conduisant aux épisodes de pollution sont étudiées et leur lien avec les mécanismes précédents est explicité. On montre que ces épisodes se déroulent toujours dans un contexte anticyclonique, sont induits par la présence d'une inversion et que leur évolution est liée à celle des régimes de temps. Pendant ces épisodes, le système de vents local est toujours similaire, indépendant du régime synoptique et constitué de vents thermiques, dont l'organisation spatiale est gouvernée par la géométrie du site. Ces courants sont contenus dans la couche d'inversion qui persiste pendant toute la durée de l'épisode et n'est pas détruite si l'énergie solaire est insuffisante. Le seuil énergétique correspondant est mis en évidence
The study is focusing on the dynamics of the stably-stratified Atmospheric Boundary Layer in wintertime in valleys, especially during situations leading to PM10 pollution peaks. The analysis is made by means of LES-like numerical simulations and local measurements. In a first part, we study the katabatic wind created over the slopes of a narrow valley. We show that they are intermittent and turbulent and that their turbulent diffusivity is proportional to the square of a Froude number, and decreases with the ambient stratification. We also study the internal wave field generated by these winds and find that this frequency depends only on the stratification and seems to be independent of the characteristics of its source. In a second part, we study the valley wind system and the thermal inversions which occur by winter conditions in the valleys of the Grenoble area. Meteorological conditions leading to pollution episodes in the Grenoble valleys are also studied and their link with the previous mechanisms are explained. We show that these episodes take place during anticyclonic conditions, are induced by thermal inversion and that their evolution is linked to that of the weather regimes. During these episodes, we show that the local winds system is always the same, independent of the synoptical regime and consists of thermally-driven winds, whose spatial organization is controlled by the geometry of the site. These currents are confined into a thermal inversion, which persists during the whole episode, and is however not destroyed during the day if the solar energy is not sufficient. The corresponding energy treshold is highlighted
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Meyer, Amelie. « Diapycnal mixing and the internal wave field north of the Kerguelen Plateau ». Thesis, 2014. https://eprints.utas.edu.au/18702/1/whole-Meyer-thesis.pdf.

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Dissipating internal waves are the main source of mixing in the stratified ocean. Recent observational and modelling studies in the Southern Ocean primarily associate the generation of internal waves with either wind forcing or with rough topography. This work explores the nature of mixing and its sources north of the Kerguelen Plateau, a large topographic feature in the Southern Ocean. Based on novel observations, we present the distribution and intensity of mixing, and the internal wave field properties. This thesis includes (i) a regional description of the Kerguelen Plateau oceanographic characteristics; (ii) estimates of mixing and its sources; and (iii) a study of the internal wave field in the vicinity of the Plateau. The data consist of 914 temperature, salinity, pressure and horizontal velocity profiles from Electromagnetic Autonomous Profling Explorer (EM-APEX) floats deployed northeast of the Kerguelen Plateau in 2008. We are able to estimate diapycnal mixing in the upper 1600m of the water column. To estimate mixing, we apply both a Thorpe-scale analysis on density inversions and a shear-strain parameterization method and compare the estimates with direct microstructure measurements. The observational results provide the first clear connection between the distribution and intensity of mixing, and the associated internal wave field properties. In the Kerguelen Plateau area, mean mixing from the EM-APEX data is slightly larger (diffusivity of O(10-5m2s-1) than typical open-ocean background levels. Mixing intensities show strong spatial and temporal variability reaching considerably large values close to the Plateau (di�usivity of O(10
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Ray, Douglas Scott. « Acoustic travel time perturbations due to an internal tide and internal wave field in the Barents Sea ». Thesis, 1993. http://hdl.handle.net/10945/24113.

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Livres sur le sujet "Internal wave field"

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Ray, Douglas Scott. Acoustic travel time perturbations due to an internal tide and internal wave field in the Barents Sea. Springfield, Va : Available from the National Technical Information Service, 1993.

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2

Center, Langley Research, dir. Mach 10 experimental database of a three-dimensional scramjet inlet flow field. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1995.

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3

Holland, Scott D. Mach 10 experimental database of a three-dimensional scramjet inlet flow field. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1995.

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4

Verhoff, August. Far field computational boundary conditions for internal flow problems. Monterey, Calif : Naval Postgraduate School, 1988.

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5

Recovery, United States Congress Senate Committee on Homeland Security and Governmental Affairs Ad Hoc Subcommittee on Disaster. Host communities : Analyzing the role and needs of communities that take in disaster refugees in the wake of major disasters and catastrophes : hearing before the Ad Hoc Subcommittee on Disaster Recovery of the Committee on Homeland Security and Governmental Affairs, United States Senate, One Hundred Tenth Congress, first session, December 3, 2007, field hearing in Baton Rouge, Louisianna [i.e. Louisiana]. Washington : U.S. G.P.O., 2008.

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United States. Congress. Senate. Committee on Homeland Security and Governmental Affairs. Ad Hoc Subcommittee on Disaster Recovery. Host communities : Analyzing the role and needs of communities that take in disaster refugees in the wake of major disasters and catastrophes : hearing before the Ad Hoc Subcommittee on Disaster Recovery of the Committee on Homeland Security and Governmental Affairs, United States Senate, One Hundred Tenth Congress, first session, December 3, 2007, field hearing in Baton Rouge, Louisianna [i.e. Louisiana]. Washington : U.S. G.P.O., 2008.

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Fred, Aminzadeh, et Simaan Marwan, dir. Expert systems in exploration. Tulsa, Okla : Society of Exploration Geophysicists, 1991.

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Chimenti, Dale, Stanislav Rokhlin et Peter Nagy. Physical Ultrasonics of Composites. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780195079609.001.0001.

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Physical Ultrasonics of Composites is a rigorous introduction to the characterization of composite materials by means of ultrasonic waves. Composites are treated here not simply as uniform media, but as inhomogeneous layered anisotropic media with internal structure characteristic of composite laminates. The objective here is to concentrate on exposing the singular behavior of ultrasonic waves as they interact with layered, anisotropic materials, materials which incorporate those structural elements typical of composite laminates. This book provides a synergistic description of both modeling and experimental methods in addressing wave propagation phenomena and composite property measurements. After a brief review of basic composite mechanics, a thorough treatment of ultrasonics in anisotropic media is presented, along with composite characterization methods. The interaction of ultrasonic waves at interfaces of anisotropic materials is discussed, as are guided waves in composite plates and rods. Waves in layered media are developed from the standpoint of the "Stiffness Matrix", a major advance over the conventional, potentially unstable Transfer Matrix approach. Laminated plates are treated both with the stiffness matrix and using Floquet analysis. The important influence on the received electronic signals in ultrasonic materials characterization from transducer geometry and placement are carefully exposed in a dedicated chapter. Ultrasonic wave interactions are especially susceptible to such influences because ultrasonic transducers are seldom more than a dozen or so wavelengths in diameter. The book ends with a chapter devoted to the emerging field of air-coupled ultrasonics. This new technology has come of age with the development of purpose-built transducers and electronics and is finding ever wider applications, particularly in the characterization of composite laminates.
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Lowrie, William. Geophysics : A Very Short Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/actrade/9780198792956.001.0001.

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Geophysics is the physics of the Earth. It encompasses areas such as seismology, plate tectonics, gravity, and the Earth’s magnetic field, all of which give clues to both the structure and the working of the Earth. Geophysics: A Very Short Introduction describes the internal and external processes that affect the planet, as well as the techniques used by geophysicists to investigate them. It explains how analysis of the seismic waves produced in earthquakes reveals the Earth’s internal structure, and tells how heat is transported through its interior. Chapters describe how satellite missions measure the gravity and magnetic fields, and explain how its magnetic field shields the Earth against harmful radiation from the Sun and outer space.
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Temesgen, Zelalem, dir. Mayo Clinic Infectious Diseases Board Review. Oxford University Press, 2012. http://dx.doi.org/10.1093/med/9780199827626.001.0001.

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While infections have always played an important role in the history of mankind, advances in science and technology as well as rapid globalization have resulted in an unprecedented wave of new and old infections thrust into the limelight. The recent pandemic of H1N1 influenza virus infection demonstrates the recurrent theme of emerging and reemerging pathogens that continue to impact public health and patient care areas. Drug resistance among various organisms (not limited to bacteria) has unfortunately become the expectation and, not infrequently, we have been left with few or no efficacious treatment options, an experience not witnessed in more than 7 decades. Human immunodeficiency virus infection continues to challenge our abilities to provide the desired level of care in most areas of the world. Novel syndromes of infection continue to be defined as newer forms of immunosuppression and the development of unique medical devices become standard practice in all areas of medicine and surgery. For trainees and practitioners in the field of infectious diseases today, these factors mandate intense study to establish an expertise in the field that is required to provide best practices now and beyond. This board review will be pivotal in that education. This book is designed and intended primarily for infectious diseases trainees and practitioners preparing for the infectious disease subspecialty examination of the American Board of Internal Medicine. We believe that this book will also be useful to infectious diseases practitioners as well as general internists and other clinicians who desire a comprehensive but practical overview of contemporary infectious diseases topics.
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Chapitres de livres sur le sujet "Internal wave field"

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Henyey, Frank S., et Charles Macaskill. « Sound through the internal wave field ». Dans Stochastic Modelling in Physical Oceanography, 141–84. Boston, MA : Birkhäuser Boston, 1996. http://dx.doi.org/10.1007/978-1-4612-2430-3_6.

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Morozov, Eugene G. « Semidiurnal Internal Wave Global Field ; Global Estimates of Internal Tide Energy ». Dans Oceanic Internal Tides : Observations, Analysis and Modeling, 263–91. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73159-9_8.

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Millis, Bryan A. « Evanescent-Wave Field Imaging : An Introduction to Total Internal Reflection Fluorescence Microscopy ». Dans Methods in Molecular Biology, 295–309. Totowa, NJ : Humana Press, 2011. http://dx.doi.org/10.1007/978-1-60327-216-2_19.

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Maingonnat, Igor, Gilles Tissot et Noé Lahaye. « Correlated Structures in a Balanced Motion Interacting with an Internal Wave ». Dans Mathematics of Planet Earth, 207–22. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-40094-0_9.

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AbstractCharacterizing the loss of coherence of an internal tide propagating through mesoscale turbulence has been a major challenge in oceanography, particularly due to its implications for the interpretation of satellite data. In this paper, we intend to study the correlations between a balanced motion and the incoherent part of a wave in an idealised configuration. We introduce a new modal decomposition technique, named broad-band proper orthogonal decomposition (BBPOD), which consists in performing a proper orthogonal decomposition (POD) on complex demodulated variables. After connecting BBPOD to the standard SPOD, we show that BBPOD, coupled with the extended POD technique enables us to associate the principal components of the incoherent field to the slow flow structures responsible of this loss of coherence through triadic interactions with the incident wave.
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Li, Jiyue, Donghui Wang, Meng Zhang, Hongbing Liu et Xianqiang Qu. « Study of Stress Analysis Method for Floating Nuclear Power Plant Containment Under Combined Multiple Loads ». Dans Springer Proceedings in Physics, 800–811. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_69.

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AbstractFloating nuclear power plants (FNPP) are a combination of small nuclear reactors and hull structures. The applicable design codes and simulation analysis methods of floating nuclear power plants are nearly seldom, especially for the ultimate strength of containment considering multi loads. In order to analyze the structural strength of the steel containment of a floating nuclear power plant under the combined action of multiple loads, the structural response is analyzed in ANSYS considering the external hull loads and internal containment loads such as wave loads, wind loads, current loads, hull impact loads, internal pressure and temperature of the containment. The structural response result from wind, wave, current, internal pressure and temperature loads are calculated, separately, to obtain the stress field of the containment. Finally, the stress fields of the containment generated by each load are superimposed to obtain the stress distribution characteristics of the containment, and then strength assessment and stress analysis are performed.
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Lemdiasov, Rosti, Arun Venkatasubramanian et Ranga Jegadeesan. « Estimating Electric Field and SAR in Tissue in the Proximity of RF Coils ». Dans Brain and Human Body Modeling 2020, 293–307. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45623-8_18.

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AbstractMedical implants that require recharging typically use magnetic resonant coupling of transmit (external) and receive (internal) RF coils. Apart from magnetic field, the transmit coil creates a time-varying electric field that excites currents not only in the receive coil but also in the surrounding tissues. Radio frequency (RF) exposure assessment for inductive systems used in wireless powering and telemetry is done using electric field, specific absorption rate (SAR), and induced current as metrics. Full-wave analysis using RF simulation tools such as Ansys HFSS is generally used to estimate these metrics, and the results are widely accepted. However, such simulation-based analysis is quite rigorous and time-consuming, let alone the complexities with setting up the simulation.In this paper, we present a simple approach to estimating exposure (electric field, SAR, induced current) from fundamental electromagnetic principles enabling ability to arrive at results quickly. It significantly reduces the computational time in iterative approaches where multiple simulation runs are needed.
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Filatov, N., A. Terzevik, R. Zdorovennov, V. Vlasenko, N. Stashchuk et K. Hutter. « Field Studies of Non-Linear Internal Waves in Lakes on the Globe ». Dans Nonlinear Internal Waves in Lakes, 23–103. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23438-5_2.

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Gerlich, Stefan, Yaakov Y. Fein, Armin Shayeghi, Valentin Köhler, Marcel Mayor et Markus Arndt. « Otto Stern’s Legacy in Quantum Optics : Matter Waves and Deflectometry ». Dans Molecular Beams in Physics and Chemistry, 547–73. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63963-1_24.

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AbstractOtto Stern became famous for molecular beam physics, matter-wave research and the discovery of the electron spin, with his work guiding several generations of physicists and chemists. Here we discuss how his legacy has inspired the realization of universal interferometers, which prepare matter waves from atomic, molecular, cluster or eventually nanoparticle beams. Such universal interferometers have proven to be sensitive tools for quantum-assisted force measurements, building on Stern’s pioneering work on electric and magnetic deflectometry. The controlled shift and dephasing of interference fringes by external electric, magnetic or optical fields have been used to determine internal properties of a vast class of particles in a unified experimental framework.
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Bulatov, V. V. « Far Internal Gravity Waves Fields from Radially Symmetric Perturbation ». Dans Springer Proceedings in Earth and Environmental Sciences, 47–54. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99504-1_6.

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Bulatov, V. V. « Internal Gravity Waves Far Fields in Stratified Rotating Ocean ». Dans Springer Geology, 283–86. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-16575-7_27.

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Actes de conférences sur le sujet "Internal wave field"

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Antos, Roman, Martin Veis, Jan Mistrik, Petr Janicek et Takayuki Ishibashi. « Rigorous coupled wave analysis for deep structures with internal field distribution ». Dans 2017 IEEE International Conference on Computational Electromagnetics (ICCEM). IEEE, 2017. http://dx.doi.org/10.1109/compem.2017.7912792.

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Farahani, A. V., et A. Konrad. « Wave Propagation in Magnetic Substrates with Non-uniform Internal Field Distribution ». Dans INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.375914.

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Xu, Wei, Yile Li et Arjan Voogt. « Internal Wave Soliton Passage Simulation During Offloading ». Dans ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10369.

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Large amplitude internal wave solitons, generated by interactions between tidal waves and continental shelf breaks, are found commonly in the continuously stratified oceans. Its impact to the FLNG offloading operations, in both side-by-side and dynamically positioning tandem configurations, has been investigated systematically in this paper. The most severe internal wave soliton from a 3-year current field measurement is used as the base case for the study of a generic FLNG offloading during the soliton passage. The MARIN time domain simulation tool, aNySIM, is extended to model the soliton-induced hydrodynamic loads on both FLNG and LNG carrier. Due to the finite speed of advancing soliton fronts, phase differences occur in the resulting current loads on the vessels. The impact of the soliton on offloading operations is evaluated quantitatively by comparing the simulation results with and without soliton in otherwise identical environmental conditions. The maximum amplitude, advancing speed and heading of an internal wave soliton package are varied to examine its sensitivity to the offloading dynamics.
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Li, Luksun, et David N. Payne. « Permanently-induced Linear Electro-Optic Effect in Silica Optical Fibres ». Dans Integrated and Guided Wave Optics. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/igwo.1989.tuaa2.

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Permanent electric-field-induced linear electro-optic effects have been observed in fused-silica optical fibres subjected to strong electric fields by means of internal electrodes. This electric-field-poling phenomenon can be used to construct a Pockels modulator and other electro-optic devices.
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Sergievskaya, I. A., et S. A. Ermakov. « Short gravity-capillary waves modulation due to long surface and internal wave : laboratory and field experiment ». Dans SPIE Remote Sensing. SPIE, 2011. http://dx.doi.org/10.1117/12.898213.

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Liling Jin, Jianlong Li et Wen Xu. « Tracking sound speed field under internal wave perturbation with the unscented Kalman filter ». Dans OCEANS 2012. IEEE, 2012. http://dx.doi.org/10.1109/oceans.2012.6404997.

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Chung, Euiheon, Daekeun Kim et Peter T. C. So. « Super-resolution Wide-field Imaging : Objective-launched Standing Wave Total Internal Reflection Fluorescence Microscopy ». Dans Biomedical Topical Meeting. Washington, D.C. : OSA, 2006. http://dx.doi.org/10.1364/bio.2006.tui46.

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Ho, Chung-Ru, Feng-Chun Su, Nan-Jung Kuo, Shih-Jen Huang, Chun-Te Chen et Quanan Zheng. « Detecting Internal Waves From Satellite Ocean Color Imagery ». Dans 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92177.

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Internal waves have been observed by lots of high resolution satellite images, such as Synthetic Aperture Radar (SAR) and optical images of SPOT and Landsat. These images are usually expensive. In this study, some free but lower spatial resolution satellite images are applied to observe the internal wave phenomena. The internal waves in the Sulu Sea are detected from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) onboard the Orbview-2 satellite. The SeaWiFS image has a spatial resolution of 1.1 km. It is acceptable to observe the internal wave phenomena while the soliton width is larger than the image resolution. The results show that the internal solitary in the Sulu Sea can be observed successfully with SeaWiFS chlorophyll images. The internal waves in the Sulu Sea have amplitudes of 10 to 90 m and wavelengths of 5 to 16 km. The large-amplitude internal solitary waves may significantly influence the near-surface chlorophyll concentration. The chlorophyll concentration would be lower when the depression internal waves passed through. A theoretic model is proposed and tested to estimate the amplitudes of internal waves from chlorophyll concentration images.
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James, Jintu K., et Heuy Dong Kim. « Multiple Shock Waves and its Unsteady Characteristics in Internal Flows ». Dans ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5087.

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Abstract Shock wave turbulent boundary layer interaction is a fundamental phenomenon observed in most of the gas dynamics applications such as wind tunnels, supersonic air intakes, transonic airfoil, nozzle flows, etc. The flow field and shock wave pattern in a constant area duct are analyzed experimentally. The focus of the present study is to present the time-resolved flow characteristics of the multiple shock waves and its oscillations. High-speed Schlieren flow visualization is used to capture the transient shock structure in the wind tunnel constant area test section. A gradient-based image processing was incorporated to capture the shock excursion details. Results indicate that the shock pattern is unsymmetrical in the flow field. The foot of the lambda shock wave in the upper and lower exhibit a difference in axial location and there is a large difference in this value at the mean position when the shock moves in the upstream direction compared to the downstream movement.
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Wood, Deborah J. « Modelling of an Internal Wave Gravity Current Using Eulers Equations ». Dans ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28495.

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In nature where thermoclines exist an internal wave may form, and if a sloping bottom is also present then a gravity current may occur. In this study we use a Navier-Stokes solver to solve Eulers equations to simulate the generation and evolution of such a wave. The thermoclines used in this study are similar to those seen in nature except scaled down to the laboratory scale used by some ongoing experiments. We find that the Navier-Stokes solver generates and evolves a wave similar to experimental observations. The head of the gravity current is dominated by medium density fluid with the thermocline thickness growing and becoming thickest at the centre of the head. Maximum velocities of approximately 0.5 of the linear wave speed are found which are similar to experimental and field observations.
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Rapports d'organisations sur le sujet "Internal wave field"

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Henyey, Frank S. Internal Wave Theory, Modeling and Theory of the Internal Wave Field. Fort Belvoir, VA : Defense Technical Information Center, avril 1995. http://dx.doi.org/10.21236/ada300337.

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Goff, John A., et Brian K. Arbic. Effects of Small-Scale Bathymetric Roughness on the Global Internal Wave Field. Fort Belvoir, VA : Defense Technical Information Center, septembre 2008. http://dx.doi.org/10.21236/ada533846.

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Goff, John A., et Brian K. Arbic. Effects of Small-scale Bathymetric Roughness on the Global Internal Wave Field. Fort Belvoir, VA : Defense Technical Information Center, septembre 2007. http://dx.doi.org/10.21236/ada573224.

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Pinkel, Robert. Non-linear Internal Wave Evolution in the South China Sea : 2005 Field Program. Fort Belvoir, VA : Defense Technical Information Center, mai 2009. http://dx.doi.org/10.21236/ada499644.

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Orr, Marshall H. The Influence of the Shallow Water Internal Wave Field on the Properties of Acoustic Signals. Fort Belvoir, VA : Defense Technical Information Center, septembre 1997. http://dx.doi.org/10.21236/ada629255.

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Godin, Oleg A., et Alexander G. Voronovich. Multiple Scattering of Sound by Internal Waves and Acoustic Characterization of Internal Wave Fields in Deep and Shallow Water. Fort Belvoir, VA : Defense Technical Information Center, septembre 2006. http://dx.doi.org/10.21236/ada613572.

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Godin, Oleg A., et Alexander G. Voronovich. Multiple Scattering of Sound by Internal Waves and Acoustic Characterization of Internal Wave Fields in Deep and Shallow Water. Fort Belvoir, VA : Defense Technical Information Center, septembre 2007. http://dx.doi.org/10.21236/ada541756.

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