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Littérature scientifique sur le sujet « Wave reflections »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Wave reflections"

Allsop, N. W. H., et S. S. L. Hettiarachchi. « REFLECTIONS FROM COASTAL STRUCTURES ». Coastal Engineering Proceedings 1, n^o 21 (29 janvier 1988) : 58. http://dx.doi.org/10.9753/icce.v21.58.

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Wave reflections at and within a coastal harbour may make a significant contribution to wave disturbance in the harbour. Reflected waves may lead to danger to vessels navigating close to structures, and may reduce the availability of berths within the harbour. Wave reflections may also increase local scour or general reduction in sea bed levels. In the design of breakwaters, sea walls, and coastal revetments, it is therefore important to estimate and compare the reflection performance of alternative structure types. In the use of numerical models of wave motion within harbours, it is essential to define realistically the reflection properties of each boundary. This paper presents results from a study of the reflection performance of a wide range of structures used in coastal and harbour engineering.

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Isaacson, Michael, et Shiqin Qu. « Predicted wave field in a laboratory wave basin ». Canadian Journal of Civil Engineering 17, n^o 6 (1 décembre 1990) : 1005–14. http://dx.doi.org/10.1139/l90-111.

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The present paper describes a numerical method for predicting the wave field produced by a segmented wave generator undergoing specified motions in a wave basin which may contain partially reflecting sides. The approach used is based on linear diffraction theory and utilizes a point source representation of the generator segments and any reflecting walls that are present. The method involves the application of a partial reflection boundary condition, which is discussed. Numerical results are presented for the propagating wave field due to specified wave generator motions in a rectangular basin. Cases that are considered include both perfectly absorbing and partially reflecting beaches along the basin sides, as well as the presence of perfectly reflecting short sidewalls near the generator. The method appears able to account adequately for the effects of wave diffraction and partial reflections, and to predict the generated wave field realistically. Key words: coastal engineering, hydrodynamics, laboratory facilities, ocean engineering, wave diffraction, wave generation, wave reflection.

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Berger, D. S., J. K. Li, W. K. Laskey et A. Noordergraaf. « Repeated reflection of waves in the systemic arterial system ». American Journal of Physiology-Heart and Circulatory Physiology 264, n^o 1 (1 janvier 1993) : H269—H281. http://dx.doi.org/10.1152/ajpheart.1993.264.1.h269.

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Traditional analysis of pulse-wave propagation and reflection in the arterial system treats measured pressure and flow waves as the sum of a single forward wave (traveling away from the heart) and a single backward wave (traveling toward the heart). The purpose of this study was to develop a more general wave reflection theory that allows repeated reflection of these waves. The arterial system was modeled as a uniform viscoelastic tube terminating in a complex load with reflections occurring at the tube load interface and the heart tube interface. The resulting framework considers the forward wave to be the sum of an initial wave plus a series of antegrade waves. Similarly, the backward wave is the sum of a series of retrograde waves. This repeated reflection theory contains within it the traditional forward/backward wave reflection analysis as a special case. In addition, the individual antegrade and retrograde waves, at the tube entrance, are shown to be independent of the tube length. Aortic pressure and flow data, from dog experiments, were used to illustrate the phenomenon of repeated reflections. Alteration of the arterial system loading conditions, brought about through pharmacological intervention, affected the number and morphology of repeated waves. These results are compared with those found in traditional forward/backward reflection analysis.

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Hametner, Bernhard, Hannah Kastinger et Siegfried Wassertheurer. « Simulating re-reflections of arterial pressure waves at the aortic valve using difference equations ». Proceedings of the Institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine 234, n^o 11 (20 juillet 2020) : 1243–52. http://dx.doi.org/10.1177/0954411920942704.

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Re-reflections of arterial pressure waves at the aortic valve and their influence on aortic wave shape are only poorly understood so far. Therefore, the aim of this work is to establish a model enabling the simulation of re-reflection and to test its properties. A mathematical difference equation model is used for the simulations. In this model, the aortic blood pressure is split into its forward and backward components which are calculated separately. The respective equations include reflection percentages representing reflections throughout the arterial system and a reflection coefficient at the aortic valve. While the distal reflections are fixed, different scenarios for the reflection coefficient at the valve are simulated. The results show that the model is capable to provide physiological pressure curves only if re-reflections are assumed to be present during the whole cardiac cycle. The sensitivity analysis on the reflection coefficient at the aortic valve shows various effects of re-reflections on the modelled blood pressure curve. Higher levels of the reflection coefficient lead to higher systolic and diastolic pressure values. The augmentation index is notably influenced by the systolic level of the reflection coefficient. This difference equation model gives an adequate possibility to simulate aortic pressure incorporating re-reflections at the site of the aortic valve. Since a strong dependence of the aortic pressure wave on the choice of the reflection coefficient have been found, this indicates that re-reflections should be incorporated into models of wave transmission. Furthermore, re-reflections may also be considered in methods of arterial pulse wave analysis.

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Vuillon, J., D. Zeitoun et G. Ben-Dor. « Reconsideration of oblique shock wave reflections in steady flows. Part 2. Numerical investigation ». Journal of Fluid Mechanics 301 (25 octobre 1995) : 37–50. http://dx.doi.org/10.1017/s0022112095003788.

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The reflection of shock waves over straight reflecting surfaces in steady flows was investigated numerically with the aid of the LCPFCT algorithm. The findings completely supported the experimental results which were reported in Part 1 of this paper (Chpoun et al. 1995). In addition, the dependence of the resulting shock wave configuration on the distance between the trailing edge of the reflecting wedge and the bottom surface, inside the dual-solution domain, was studied. As a result of this study, as well as the one reported in Part 1, the state of the art of shock wave reflections in steady flows was reconsidered.

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Isaacson, Michael, Enda O'Sullivan et John Baldwin. « Reflection effects on wave field within a harbour ». Canadian Journal of Civil Engineering 20, n^o 3 (1 juin 1993) : 386–97. http://dx.doi.org/10.1139/l93-054.

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The present paper outlines a numerical model for predicting the wave field in a harbour with partially reflecting boundaries, and describes laboratory tests undertaken to assess the model. The numerical model is based on linear diffraction theory and involves the application of a partial reflection boundary condition. By utilizing a wave doublet representation of the fluid boundaries instead of the usual wave source representation, the extension is made to general harbour configurations that include breakwaters. Numerical results are compared with known solutions for specific reference configurations. Laboratory measurements have been made of the wave field within a particular harbour model having portions of the boundary corresponding to different degrees of wave reflection. A comparison with the numerical predictions is summarized and highlights the importance of adequately modelling the partial reflections within the harbour. Key words: breakwaters, coastal engineering, harbours, waves, wave diffraction, wave reflection.

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Modra, Ben, Dan Howe, Anthony Folan et Kate McLean. « CHANNEL CONCENTRATION AND REFLECTIONS FROM DREDGE CHANNELS ». Coastal Engineering Proceedings, n^o 36v (28 décembre 2020) : 25. http://dx.doi.org/10.9753/icce.v36v.management.25.

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Wave reflections from dredge channels are an important consideration for coastal infrastructure. A physical model study of a proposed development for the Port of Townsville demonstrated that channel reflection, and the relatively poorly understood channel concentration are significant processes that need to be considered in coastal developments. The study showed that channel reflection and channel concentration can significantly transform the local waves, resulting in complex multidirectional wave fields and higher design wave conditions.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/XsKsofNZzvQ

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Vanden Eynden, Frederic, Bachar El-Oumeiri, Thierry Bové, Guido Van Nooten et Patrick Segers. « Proximal pressure reducing effect of wave reflection in the pulmonary circulation disappear in obstructive disease : insight from a rabbit model ». American Journal of Physiology-Heart and Circulatory Physiology 316, n^o 5 (1 mai 2019) : H992—H1004. http://dx.doi.org/10.1152/ajpheart.00635.2018.

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Locating the site of increased resistance within the vascular tree in pulmonary arterial hypertension could assist in both patient diagnosis and tailoring treatment. Wave intensity analysis (WIA) is a wave analysis method that may be capable of localizing the major site of reflection within a vascular system. We investigated the contribution of WIA to the analysis of the pulmonary circulation in a rabbit model with animals subjected to variable occlusive pulmonary disease. Animals were embolized with different sized microspheres for 6 wk ( n = 10) or underwent pulmonary artery (PA) ligation for 6 wk ( n = 3). These animals were compared with a control group ( n = 6) and acutely embolized animals ( n = 4). WIA was performed and compared with impedance-based methods to analyze wave reflections. The control group showed a relatively high extent of reflected waves (15.7 ± 10.6%); reflections had a net effect of pressure reduction during systole, suggesting an open-end reflector. The pattern of wave reflection was not different in the group with partial PA ligation (12.4 ± 4.1%). In the chronically embolized group, wave reflection was not observed (3.6 ± 1.5%). In the acute embolization group, wave reflection was more prominent (37.3 ± 12.6%), with the appearance of a novel wave increasing pressure, suggesting the appearance of a closed-end reflector. Wave reflections of an open-end type are present in the normal rabbit pulmonary circulation. However, the pattern and nature of reflections vary according to the extent of pulmonary vascular occlusion. NEW & NOTEWORTHY The study proposes an original framework of a complementary analysis of wave reflections in the time domain and in the frequency domain. The methodology was used in the pulmonary circulation with different forms of chronic obstructions. The results suggest that the pulmonary vascular tree generates a reflection pattern that could actually assist the heart during ejection, and chronic obstruction significantly modifies the pattern.

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Monaldi, Lucas, Luis Gutiérrez Marcantoni et Sergio Elaskar. « OpenFOAMTM Simulation of the Shock Wave Reflection in Unsteady Flow ». Symmetry 14, n^o 10 (1 octobre 2022) : 2048. http://dx.doi.org/10.3390/sym14102048.

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This work studies the impact of a shock wave traveling with non-constant velocity over straight surfaces, generating an unsteady and complex reflection process. Two types of shock waves generated by sudden energy released are studied: cylindrical and spherical. Several numerical tests were developed considering different distances between the shock wave origin and the reflecting surface. The Kurganov, Noelle, and Petrova (KNP) scheme implemented in the rhoCentralFoam solver of the OpenFOAMTM software is used to reproduce the different shock wave reflections and their transitions. The numerical simulations of the reflected angle, Mach number of the shock wave, and position of the triple point are compared with pseudo-steady theory numerical and experimental studies. The numerical results show good accuracy for the reflected angle and minor differences for the Mach number. However, the triple point position is more difficult to predict. The KNP scheme in the form used in this work demonstrates the ability to capture the phenomena involved in the unsteady reflections.

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van der Baan, Mirko, et Dirk Smit. « Amplitude analysis of isotropic P-wave reflections ». GEOPHYSICS 71, n^o 6 (novembre 2006) : C93—C103. http://dx.doi.org/10.1190/1.2335877.

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The analysis of amplitude variation with offset (AVO) of seismic reflections is a very popular tool for detecting gas sands. It is assumed in AVO, however, that plane-wave reflection coefficients can be used directly to analyze amplitudes measured in the time-offset domain. This is not true for near-critical angles of reflection. Plane-wave reflection coefficients incorporate the contribution of the head wave. A plane-wave decomposition such as a proper [Formula: see text] transform must be applied to the seismic data for accurate analysis of reflection coefficients near critical angles. Amplitudes after plane-wave decomposition are related directly to the plane-wave reflection coefficients; geometric-spreading corrections are no longer required, and polarization effects of P-P reflections recorded on the [Formula: see text]-component are also removed. Conventional, linearized expressions for the isotropic P-P-wave reflection coefficient depend on contrasts in three parameters, and they require background information about average P-wave/S-wave velocity ratios. We derive a new reduced-parameter expression that depends only on two free parameters without loss of accuracy. No extra prior parameter information is needed either. The reduction in free parameters is achieved by explicitly incorporating P-wave moveout information. A new AVO strategy is developed that requires moveout analysis of three reflections: the target horizon, the reflections directly above and below the target horizon, and the amplitudes of the target horizon. The new AVO expression can be used in the time-offset domain for precritical arrivals and in the [Formula: see text] domain for precritical and critical reflections.

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Thèses sur le sujet "Wave reflections"

Dickson, William S. « Wave reflections from breakwaters ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA283483.

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Thesis (M.S. in (Meteorology and Physical Oceanography)) Naval Postgraduate School, June 1994.
Thesis advisor(s): Thomas H. C. Herbers, Edward B. Thornton. "June 1994." Bibliography: p. 37. Also available online.

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Karenowska, Alexy Davison. « Some magnetic reflections on wave dynamics ». Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:d31bd222-a948-45f8-9617-40507f4f96c6.

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Karimi, Hussain H. (Hussain Habibullah). « Oblique reflections of internal gravity wave beams ». Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74673.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 99-100).
We study nonlinear effects in reflections of internal gravity wave beams in a continuously stratified liquid which are incident upon a uniform slope at an oblique angle. Wave motion in a stratified fluid medium is unique in the sense that the anisotropy of stratification directs energy transport in a manner specified by the frequency of the driving mechanism. Since there is no spatial variation along the direction of the flow field, plane waves are exact nonlinear solutions of the governing equations. In general, energy is carried in the form of a wave beam, which is a superposition of plane waves having parallel wavevectors. However, beams incident upon a surface interact with the re reflected beam in a locally confined region. Nonlinear interactions in the vicinity of the reflection site where the incident and reflected beams overlap act as a source for the generation of higher order harmonics. Employing small-amplitude expansions, we determine the directions of propagation and the strength of primary and second-harmonic reflected beams. The energy associated with the secondary beam during steady-state conditions is also computed. We find that in-plane reflections produce the strongest nonlinear reflections and that larger spatial variations of the incident beam profile produce stronger secondary beams.
by Hussain H. Karimi.
S.M.

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Birtel, Philip [Verfasser]. « Inclusion of Multi-Reflections in the Beam-Wave Interaction Simulation of Traveling Wave Tubes / Philip Birtel ». München : Verlag Dr. Hut, 2011. http://d-nb.info/1013526538/34.

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Papandreou, Benjamin David. « On the detection of shallow buried objects using seismic wave reflections ». Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/334160/.

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This thesis is concerned with a methodology for the detection of shallow (of order 1 metre) objects buried in soil using seismic waves. Possible objects of interest include infrastructure, archaeological artefacts and ordinance. A mathematical analysis of an idealised system is performed to gain understanding of both seismic wave propagation and the generation of these waves by surface sources. The mathematical techniques used in the existing analysis of a point vertical source are applied to the desired problem of a point horizontal surface traction. Results are displayed in a graphically concise form. An experimental methodology, capable of forming two-dimensional images through the ground, is described. The use of shear waves is shown preferable. The advantages and implementation of using time extended, rather than impulsive, excitation signals are described. Additional signal processing techniques, such as generalised cross-correlation functions, are also detailed. Simple numerical simulations are undertaken with the aim of both validating the post-processing algorithms and evaluating its robustness against non-ideal conditions. Simulated time histories are created by defining signals in the frequency domain and then modifying their amplitude and phase to replicate attenuation and propagation. Non-ideal conditions focus mainly on variation in the wavespeed as a function of depth. Simulations indicate that the imaging method fails for sufficiently large variations of wavespeed, particularly for objects buried below significant discontinuities in material properties. As shear waves are used for the imaging method, a source was designed and constructed to preferentially generate shear waves and was verified using field experimentation. The imaging methodology is applied to data from three experimental sites and is able to detect the target objects with some success. Problems, however, remain with the measurement of a wavespeed that is consistent and indicative of the propagation speed at depth, and in consistently obtaining a sufficiently large reflected wave from the object.

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Zhu, Xiang 1970. « 3-D numerical modeling of the P and SV wave reflections from fractured reservoirs ». Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/58162.

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Day, Elizabeth Anne. « Array studies of short period P-wave reflections from boundaries within the deep Earth ». Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610226.

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BATTAGLIA, ENZO. « Seismic reflection imaging of near surface structures using the Common Reflection Surface (CRS) Stack Method ». Doctoral thesis, Università degli Studi di Cagliari, 2014. http://hdl.handle.net/11584/266406.

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This PhD thesis aims to evaluate whether the Common-Refl ection-Surface (CRS) stack method can be considered as a more cost efficient processing alternative to the conventionally used Common Midpoint (CMP) stack method for processing of shallow and ultrashallow reflection data. The CRS stack is a seismic imaging method established for oil and gas exploration that is similar in concept to the conventional CMP stack method. Unlike the CMP stack, the CRS stack process is not confined to single CMP gathers (offset direction), but also includes neighbouring CMPs (midpoint direction) into the so-called CRS supergathers. The use of CRS supergathers enables stable \data-driven", i.e. without human interactions, velocity analysis and residual static corrections, avoiding the poorly-automated and time-consuming processing steps that are instead required when implementing conventional CMP processing. This makes the seismic imaging process more compatible with budgets available for near-surface geophysical investigations. Improving seismic imaging of near-surface reflection data, while at the same time reducing processing costs and human interaction during processing was the principal objective which guided my work. To investigate the advantages and limitations of exporting the CRS stack from the hydrocarbon exploration field to the near-surface scale, I have firstly analysed and adapted the characteristics of the CRS to the requirements of near-surface reflection data. Then, I have compared the results (seismic sections and velocity fields) obtained by processing with the CMP and the CRS stack methods for two real field datasets (P- and SH-wave)and two synthetic datasets that exhibited very large vertical velocity changes. Finally, I have proposed some original solutions that overcome several of the issues encountered when using CRS stack with near-surface data. The P-wave dataset was collected as part of a hydrogeological investigation with the aim of delineating the hydrogeological framework of a paleolake environment to a depth of few hundred metres. Using the CMP method, several nearly horizontal reectors with onsets from 60 to about 250 ms were imaged. The CRS stack produced a stacked section with greater coherency and lateral continuity than the CMP section, but also spurious alignments of seismic energy which hinder interpretation. Weighing the CRS stacked section with the corresponding CRS coherence and number of CRS stacked traces leads to a considerable reduction of the spurious alignments, resulting in a seismic section more suited to delineate the aquifer and its confining units. The SH-wave ultrashallow dataset was collected to support a geotechnical study to a depth of 10 m. The obtained CMP stacked section imaged a dipping bedrock interface below four horizontal re ectors in unconsolidated, very low velocity sediments. The vertical and lateral resolution was very high, so that despite the very shallow depth the resulting CMP stacked section showed the well-defined pinchout of two layers at less than 10 m depth. The CRS stack improved the continuity of the shallowest reector but showed an excessive smearing effect with some reector portions, including the pinchout, unresolved and not as well defined as in the (very detailed) CMP counterpart. Restricting the CRS stack process to single CMP gathers, preserving the CRS-supergather for the search of stacking parameters, produced a time section very similar to the CMP counterpart. In both cases, I swiftly obtained the CRS stacked sections in a fully automatic way, so with a cost/benefit ratio considerably more advantageous than that of the CMP sections, which required time-consuming prestack velocity analysis as well as residual static corrections. Moreover, using the kinematic wave field attributes determined for each stacking operation I reconstructed velocity fields matching the ones estimated with the CMP processing, even if this required a greater amount of work than that required to produce the CRS stacked sections. Finally, using two synthetic datasets, I addressed the issue of the crossing reection events that appear in data acquired in soils characterized by strong vertical velocity gradients. Although a matter debate for decades, this is an issue still unresolved by use of the conventional CMP method. Using the first synthetic dataset I showed that unlike in conventional CMP processing which cannot accurately process crossing reflection events without generating distortions and artefacts, the data-driven CRS stack imaging process considerably restricts their generation, limiting the reduction of signal-to-noise ratio and of temporal resolution in stacked traces. With the second synthetic dataset I simulated a data acquisition reproducing a case history with a high-velocity contrast in the first 5 m depth. The CRS results that I obtained from the modelled data demonstrated that the CRS stack method may be a reliable alternative for processing crossing reection events, definitely easier and faster than the construction of complicated velocity functions and/or the separated processing of the crossing events. By comparing these results with those obtained using the CMP method I obtained other interesting results, which, however, to validate would necessitate the use of real datasets. The findings of this present study demonstrates that the CRS stack could represent a significant step forward for the reduction of the costs involved in shallow and ultrashallow seismic reflection data processing, one which does not compromise the quality of results. Both these conditions being essential to the increased acceptance of the seismic reection method as a routine investigation method for use in shallow and ultrashallow seismics.

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Aloi, Daniel Nicholas. « Development and verification of a mathematical model to investigate the effects of earth-surface-based multipath reflections at a differential global positioning system ground reference site ». Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1175264170.

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Atef, Ali Hadi Mr. « ANALYSES OF URSEIS MOHO REFLECTIONS BENEATH THE PREURALIAN FOREDEEP OF THE URAL MOUNTAINS, RUSSIA ». University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1181569948.

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Livres sur le sujet "Wave reflections"

Ben-Dor, Gabi. Further analytical considerations of weak planar shock wave reflections over a concave wedge. Amsterdam : North-Holland, 1987.

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Urbanowicz, J. T. Pseduo-stationary oblique-shock-wave reflections in low gamma gases - isobutane and sulphur hexafluoride. [Downsview, Ont.] : Institute for Aerospace Studies, 1988.

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Glaz, Harland M. Interaction of oblique shock-wave reflections in air and CO2 with downstream obstacles. [S.l.] : [s.n.], 1986.

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Urbanowicz, J. T. Pseudo-stationary oblique-shock-wave reflections in low gamma gas-isobutane and sulphur hexafluoride. [Downsview, Ont.] : Dept. of Aerospace Science and Engineering, 1987.

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Glaz, Harland M. A numerical study of oblique shock-wave reflections with experimental comparisons. [S.l.] : [s.n.], 1985.

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Shirouzu, M. Evaluation of assumptions and criteria in pseduostationary oblique shock-wave reflections. [S.l.] : [s.n.], 1986.

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Glaz, Harland M. Oblique shock wave reflections in SF6 : A comparison of calculation and experiment. [S.l.] : [s.n.], 1985.

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Glaz, Harland M. A detailed numerical, graphical, and experimental study of oblique shock wave reflections. Berkeley, Calif : Lawrence Berkeley Laboratory, Physics Division, 1985.

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Hu, T. C. J. Pseudo-stationary oblique-shock-wave reflections in a polyatomic gas-sulfur hexafluoride. [Downsview, Ont.] : Institute for Aerospace Studies, 1985.

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Glaz, Harland M. A detailed numerical, graphical, and experimental study of oblique shock wave reflections. [Downsview, Ont.] : Institute for Aerospace Studies, 1986.

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Chapitres de livres sur le sujet "Wave reflections"

London, Gérard M., et Toshio Yaginuma. « Wave reflections ». Dans Developments in Cardiovascular Medicine, 221–37. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-0900-0_15.

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Zamir, Mair. « Wave Reflections ». Dans Biological and Medical Physics, Biomedical Engineering, 159–89. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-24103-6_6.

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Zamir, M. « Wave Reflections ». Dans The Physics of Pulsatile Flow, 147–85. New York, NY : Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1282-9_6.

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Needham, Charles E. « Blast Wave Reflections ». Dans Blast Waves, 171–99. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-05288-0_13.

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Needham, Charles E. « Blast Wave Reflections ». Dans Blast Waves, 197–225. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65382-2_13.

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O'Rourke, Michael, et Audrey Adji. « Arterial Wave Reflections ». Dans McDonald's Blood Flow in Arteries, 189–224. 7^e éd. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781351253765-8.

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Ben-Dor, Gabi. « Shock Wave Reflections in Steady Flows ». Dans Shock Wave Reflection Phenomena, 175–99. New York, NY : Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4757-4279-4_3.

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Ben-Dor, Gabi. « Shock Wave Reflections in Unsteady Flows ». Dans Shock Wave Reflection Phenomena, 200–271. New York, NY : Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4757-4279-4_4.

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Ben-Dor, Gabi. « Shock Wave Reflections in Pseudo-Steady Flows ». Dans Shock Wave Reflection Phenomena, 38–174. New York, NY : Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4757-4279-4_2.

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Budgeon, Shelley. « Closing Reflections ». Dans Third Wave Feminism and the Politics of Gender in Late Modernity, 182–92. London : Palgrave Macmillan UK, 2011. http://dx.doi.org/10.1057/9780230319875_8.

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Actes de conférences sur le sujet "Wave reflections"

Swillens, Abigail, Lieve Lanoye, Julie De Backer, Nikos Stergiopulos, Frank Vermassen, Pascal Verdonck et Patrick Segers. « The Impact of an Abdominal Aortic Aneurysm on Aortic Wave Reflection ». Dans ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-175514.

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The economical growth and increased welfare in the Western world have a reverse side, with an increased death toll due to cardiovascular diseases. Among these, aortic aneurysms (a local dilation) are particularly lethal as they may grow unnoticed until rupture occurs. In this study, we assessed the impact of the presence of an abdominal aortic aneurysm on arterial hemodynamics and wave reflection in particular. Experimental and numerical methods were applied. Linear wave separation was used to quantify the reflections; wave intensity analysis was applied to assess the nature of the reflected waves. In both the experimental and numerical models, negative reflections were found in the upper aorta corresponding to a backward expansion wave caused by the sudden expansion of the aorta. A numerical parameter study demonstrated that larger diameters and more compliant aneurysms generate stronger negative reflections.

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Ohlsen, Frank, et Colin MacBeth. « Unexpected shear‐wave double reflections ». Dans SEG Technical Program Expanded Abstracts 1996. Society of Exploration Geophysicists, 1996. http://dx.doi.org/10.1190/1.1826545.

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Jackson, David R., Francisco Mesa, Krzysztof A. Michalski et Juan R. Mosig. « Reflections on the Zenneck Wave ». Dans 2022 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/USNC-URSI). IEEE, 2022. http://dx.doi.org/10.1109/ap-s/usnc-ursi47032.2022.9886424.

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Xu, Yu, et Lee Lu. « Analysis of azimuthal anisotropicP‐wave reflections ». Dans SEG Technical Program Expanded Abstracts 1991. Society of Exploration Geophysicists, 1991. http://dx.doi.org/10.1190/1.1889175.

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R. Ziatdinov, S., D. Alexandrov, B. M. Kashtan et A. V. Bakulin. « Tube-Wave Reflections in Cased Boreholes ». Dans 69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609.201401798.

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Alexandrov, D. V., S. R. Ziatdinov, A. V. Bakulin et B. M. Kashtan. « Tube-wave Reflections in Cased Boreholes ». Dans Saint Petersburg 2008. Netherlands : EAGE Publications BV, 2008. http://dx.doi.org/10.3997/2214-4609.20146861.

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Taelman, Liesbeth, Joris Degroote, Abigail Swillens, Jan Vierendeels et Segers Patrick. « Analysis of Aortic Wave Travel and Reflection Using Advanced Modeling Methods in Simplified Geometries ». Dans ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53433.

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The analysis of wave travel and reflection has gained increased interest in the clinical community. The speed of the pressure pulse, PWV, (assessed from the time delay of the foot of the wave measured at two distant locations), is considered the gold standard method to assess the stiffness of arterial segments and has been shown to be of prognostic value for cardiovascular disease. Also, analysis of wave reflections has been suggested as diagnostic tool, a.o. to estimate the effect of the treatment of aortic coarctation (a congenital disease characterized by an obstructive narrowing of the upper descending aorta) on the load on the heart. The presence of a residual narrowing and/or local stiffening after treatment of aortic coarctation leads to an impedance mismatch and generates wave reflections that reach the heart very fast, given the short distance to the heart. The exact interplay between arterial stiffness, wave travel and reflection is, however, still relatively poorly understood due to the complexity of the arterial tree leading to scattered wave reflection, rather than discrete reflection.

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Malehmir, A. « The forgotten shear-wave reflections in the compressional-wave surveys ». Dans NSG2021 27th European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202120042.

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Ghose, R., F. Almeida, H. Hermosilha, F. Bonito et C. Cardoso. « Shallow, S-wave reflections over lagoon deposits ». Dans 8th EEGS-ES Meeting. European Association of Geoscientists & Engineers, 2002. http://dx.doi.org/10.3997/2214-4609.201406267.

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Meier, H., et P. Russer. « Analysis of leaky surface acoustic wave reflections ». Dans 1993 IEEE Ultasonics Symposium. IEEE, 1993. http://dx.doi.org/10.1109/ultsym.1993.339678.

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Rapports d'organisations sur le sujet "Wave reflections"

Glaz, H. M., P. Colella, I. I. Glass et R. L. Deschambault. A Detailed Numerical, Graphical, and Experimental Study of ObliqueShock Wave Reflections. Office of Scientific and Technical Information (OSTI), avril 1985. http://dx.doi.org/10.2172/889235.

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Schetselaar, E. M., G. Bellefleur et P. Hunt. Integrated analyses of density, P-wave velocity, lithogeochemistry, and mineralogy to investigate effects of hydrothermal alteration and metamorphism on seismic reflectivity : a summary of results from the Lalor volcanogenic massive-sulfide deposit, Snow Lake, Manitoba. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/327999.

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We present herein a summary of integrated data analyses aimed at investigating the effects of hydrothermal alteration on seismic reflectivity in the footwall of the Lalor volcanogenic massive-sulfide (VMS) deposit, Manitoba. Multivariate analyses of seismic rock properties, lithofacies, and hydrothermal alteration indices show an increase in P-wave velocity for altered volcanic and volcaniclastic lithofacies with respect to their least-altered equivalents. Scanning electron microscopy-energy dispersive X-ray spectrometry analyses of drill-core samples suggest that this P-wave velocity increase is due to the high abundance of high P-wave velocity aluminous minerals, including cordierite, Fe-Mg amphibole, and garnet, which in volcanic rocks are characteristic of VMS-associated hydrothermal alteration metamorphosed in the amphibolite facies. A seismic synthetic profile computed from a simple amphibolite-facies mineral assemblage model, consisting of mafic-felsic host rock contacts, a sulfide ore lens, and a discordant hydrothermal conduit, show enhanced seismic reflections at conduit-host rock contacts in comparison to the equivalent greenschist facies mineral assemblage model. Collectively our results suggest that VMS footwall hydrothermal alteration zones metamorphosed under middle- to upper-amphibolite facies conditions have enhanced potential for seismic detection.

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White, Howard. The unfinished evidence revolution : riding the five waves. Centre of Excellence for Development Impact and Learning (CEDIL), 2022. http://dx.doi.org/10.51744/mwp8.

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This paper by Howard White, titled ‘The unfinished evidence revolution: riding the five waves’ examines the current state of each of the waves of the evidence revolution, reflecting on how the evidence revolution has developed through different waves, examining the current state of each wave, before discussing the implications for evaluation in the field of international development. This paper examines the current state of each of the waves of the evidence revolution. I offer a critical perspective on each wave, and discuss the implications for evaluation in the field of international development. Whilst the use of evidence has grown, underuse and misuse remain. More importantly, there has been a failure to institutionalize the use of evidence beyond the intervention level. The last part offers some concluding comments.

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Pullan, S. E., J. A. Hunter et K. G. Neave. Shallow Shear Wave Reflection Tests. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132587.

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Walton, Jr, et Todd L. Wave Reflection from Natural Beaches. Fort Belvoir, VA : Defense Technical Information Center, août 1991. http://dx.doi.org/10.21236/ada240730.

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Pullan, S., J. Hunter, H. Crow, A. Pugin et J B Harris. Shear wave reflection techniques for hazard studies. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2012. http://dx.doi.org/10.4095/291756.

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Neave, K. G., et S. E. Pullan. Shallow Seismic Reflections using SV Waves. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127531.

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Smith, Ernest R., et C. R. Herrington. Wave Reflection at Tainter Gates. Hydraulic Model Investigation. Fort Belvoir, VA : Defense Technical Information Center, août 1992. http://dx.doi.org/10.21236/ada255212.

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Smith, Ernest R. Potential Toe Scour and Wave Reflection at Revetments. Fort Belvoir, VA : Defense Technical Information Center, mai 1996. http://dx.doi.org/10.21236/ada310316.

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Carnevale, George F. Stratified Flow, Wave Packet Reflection and Topographic Currents. Fort Belvoir, VA : Defense Technical Information Center, septembre 2001. http://dx.doi.org/10.21236/ada624782.

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