Thematische Bibliographien / Anomalous reflection and transmission

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Auswahl der wissenschaftlichen Literatur zum Thema „Anomalous reflection and transmission“

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Veröffentlicht am 1. Februar 2025

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Zeitschriftenartikel zum Thema "Anomalous reflection and transmission"

Jeong, Jeeyoon, Dasom Kim, Hyeong-Ryeol Park, Taehee Kang, Dukhyung Lee, Sunghwan Kim, Young-Mi Bahk und Dai-Sik Kim. „Anomalous extinction in index-matched terahertz nanogaps“. Nanophotonics 7, Nr. 1 (01.01.2018): 347–54. http://dx.doi.org/10.1515/nanoph-2017-0058.

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AbstractSlot-type nanogaps have been widely utilized in transmission geometry because of their advantages of exclusive light funneling and exact quantification of near-field enhancement at the gap. For further application of the nanogaps in electromagnetic interactions with various target materials, complementary studies on both transmission and reflection properties of the nanogaps are necessary. Here, we observe an anomalous extinction of terahertz waves interacting with rectangular ring-shaped sub-30 nm wide gaps. Substrate works as an index matching layer for the nanogaps, leading to a stronger field enhancement and increased nonlinearity at the gap under substrate-side illumination. This effect is expressed in reflection as a larger dip at the resonance, caused by destructive interference of the diffracted field from the gap with the reflected beam from the metal. The resulting extinction at the resonance is larger than 60% of the incident power, even without any absorbing material in the whole nanogap structure. The extinction even decreases in the presence of an absorbing medium on top of the nanogaps, suggesting that transmission and reflection from nanogaps might not necessarily represent the absorption of the whole structure.

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Chen, Yingying, Qinghua Liang, Haozhe Sun, Xiaochen Zhang, Weikang Dong, Meihua Niu, Yanji Zheng et al. „Kissing-loop nano-kirigami structures with asymmetric transmission and anomalous reflection“. Light: Advanced Manufacturing 5 (2024): 1. http://dx.doi.org/10.37188/lam.2024.042.

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Yu, Guanxia, Yihang Lv, Xiaomeng Zhang und Ruoyu Cao. „Electromagnetic propagation characteristics of one-dimensional photonic crystals with metal layers in quasi-parity-time (PT)-symmetric system“. Zeitschrift für Naturforschung A 75, Nr. 7 (28.07.2020): 665–70. http://dx.doi.org/10.1515/zna-2020-0104.

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AbstractIn this study, the propagation characteristics of electromagnetic waves in a parity-time (PT)-symmetrical 1D photonic crystal comprising dispersed silver layers are investigated. Based on the transmission matrix theory, the total reflection and transmission coefficients of the structure are obtained. It was found that, due to the PT-symmetrical structure, the reflections of the left and right incident waves are nonreciprocal. Numerical simulations indicated that the width of the band gap decreases with the increase in the gain and loss factor ρ in the PT medium, and the band gap ultimately disappears when ρ reaches a critical value, i. e., ${\rho }_{PT}$. With the increase in $\rho { >}{\rho }_{PT}$, anomalous transmittance and reflection occur within the original bang gap. As the gain and loss factor ρ continue to increase, the abnormal transmittance and reflectivity exhibit a trend of oscillatory decline, and perfect transmission can be achieved at larger values of ρ.

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Fan, Zihang, Zhaoyun Zong und Fubin Chen. „Accurate P-wave reflection and transmission coefficients for non-welded interface incorporating elasto-plastic deformation“. Annals of Geophysics 66, Nr. 3-4 (06.11.2023): PE322. http://dx.doi.org/10.4401/ag-8909.

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P-wave reflection and transmission coefficients for non-welded interface play crucial roles in broad practical engineering productions, involving fracture properties prediction and seismic inversion. However, the existing reflection coefficient equations for non-welded interface in elasto-plastic media are seldom studied, although the elasto-plastic deformation is frequently encountered in the Earth’s subsurface due to artificial and tectonic activities. In this study, we proposed the accurate reflection and transmission coefficients equation for a non-welded interface embedded in an elasto-plastic deformed medium based on the elasto-plastic acoustoelastic and linear-slip theory. In detail, this paper uses elasto-plastic acoustoelastic theory to derive the reflection and transmission coefficients equation. The reflection and transmission coefficients matrix are solved using the linear-slip theory as the boundary condition. Moreover, we use the hardening parameter and plastic deformation to represent the plastic properties of the rock, which is a function of stress and plastic deformation. Through Numerical analysis, the deformation caused by static stress has significantly changed the amplitude and the slope of the reflection and transmission coefficients amplitude. As the stress increases, the rock’s velocity becomes higher, and all reflection and transmission coefficients (i.e., RPP, RPS, TPP, TPS) abruptly change at the critical angle. Furthermore, with the increase in plastic deformation, the critical angle of the incident P-wave and the hardening parameter becomes larger than the unstressed state. The non-welded interface exhibits a low-pass frequency filter for reflected SV-waves and a high-pass frequency filter for reflected P-waves and transmitted P and SV waves. In addition, we can observe that static vertical stress can weaken the anomalous reflections caused by non-welded formations, but the effect is insignificant. On the other hand, the effect of fracture normal compliance to reflection and transmission is detailly investigated. When N<2.5*10-10(MPa-1), The non-welded interface is close to the welded interface, while N>2.5*10-5(MPa-1), the non-welded interface is close to the solid-air interface.

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Hatchell, Paul J. „Fault whispers: Transmission distortions on prestack seismic reflection data“. GEOPHYSICS 65, Nr. 2 (März 2000): 377–89. http://dx.doi.org/10.1190/1.1444733.

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Transmission distortions are observed on prestack seismic data at two locations in the Gulf of Mexico. These distortions produce anomalous amplitude versus offset (AVO) signatures. The locations of the distortion zones are determined using acquisition geometry and ray tracing. No obvious reflection events, such as shallow gas zones, are observed at the predicted locations of the distortion zones. Instead, the distortion zones correlate with buried faults and unconformities. It is postulated that the distortions are produced by velocity changes across buried faults and unconformities. The distortions result from an interference pattern resulting from seismic waves arriving from different sides of the faults. A simple model is developed to explain many of the characteristics of the distortion pattern.

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Spall, Michael A., und Joseph Pedlosky. „Reflection and Transmission of Equatorial Rossby Waves*“. Journal of Physical Oceanography 35, Nr. 3 (01.03.2005): 363–73. http://dx.doi.org/10.1175/jpo-2691.1.

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Abstract The interaction of equatorial Rossby waves with a western boundary perforated with one or more narrow gaps is investigated using a shallow-water numerical model and supporting theory. It is found that very little of the incident energy flux is reflected into eastward-propagating equatorial Kelvin waves provided that at least one gap is located within approximately a deformation radius of the equator. Because of the circulation theorem around an island, the existence of a second gap off the equator reduces the reflection of short Rossby waves and enhances the transmission of the incident energy into the western basin. The westward energy transmitted past the easternmost island is further reduced upon encountering islands to the west, even if these islands are located entirely within the “shadow” of the easternmost island. A localized patch of wind forcing was also used to generate low-frequency Rossby waves for cases with island configurations representative of the western equatorial Pacific. For both idealized islands and a coastline based on the 200-m isobath, the amount of incident energy reflected into Kelvin waves depends on both the duration of the wind event and the meridional decay scale of the anomalous winds. For wind events of 2-yr duration with a meridional decay scale of 700 km, the reflected energy is 37% of the incident flux, and the energy transmitted into the Indian Ocean is approximately 10% of the incident flux, very close to that predicted by previous theories. For shorter wind events or winds confined more closely to the equator the reflected energy is significantly less.

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He, Mengyun, Yu Huang, Huimin Sun, Yu Fu, Peng Zhang, Chenbo Zhao, Kang L. Wang, Guoqiang Yu und Qing Lin He. „Quantum anomalous Hall interferometer“. Journal of Applied Physics 133, Nr. 8 (28.02.2023): 084401. http://dx.doi.org/10.1063/5.0140086.

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Electronic interferometries in integer and fractional quantum Hall regimes have unfolded the coherence, correlation, and statistical properties of interfering constituents. This is addressed by investigating the roles played by the Aharonov–Bohm effect and Coulomb interactions on the oscillations of transmission/reflection. Here, we construct magnetic interferometers using Cr-doped (Bi,Sb)2Te3 films and demonstrate the electronic interferometry using chiral edge states in the quantum anomalous Hall regime. By controlling the extent of edge coupling and the amount of threading magnetic flux, distinct interfering patterns were observed, which highlight the interplay between the Coulomb interactions and Aharonov–Bohm interference by edge states. The observed interference is likely to exhibit a long-range coherence and robustness against thermal smearing probably owing to the long-range magnetic order. Our interferometer establishes a platform for (quasi)particle interference and topological qubits.

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XU ZHANG-CHENG, GUO CHANG-LIN, ZHAO ZONG-YAN, T.FUKAMACHI und R.NEGISHI. „ANOMALOUS TRANSMISSION OF X-RAYS UNDER ASYMMETRICAL REFLECTION CONDITION NEAR THE ABSORPTION EDGE“. Acta Physica Sinica 47, Nr. 11 (1998): 1818. http://dx.doi.org/10.7498/aps.47.1818.

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Falsi, Ludovica, Salvatore Macis, Yehonatan Gelkop, Luca Tartara, Eleonora Bonaventura, Paola Di Pietro, Andrea Perucchi et al. „Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals“. Nanomaterials 13, Nr. 5 (27.02.2023): 899. http://dx.doi.org/10.3390/nano13050899.

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We report a spectroscopic investigation of potassium–lithium–tantalate–niobate (KTN:Li) across its room-temperature ferroelectric phase transition, when the sample manifests a supercrystal phase. Reflection and transmission results indicate an unexpected temperature-dependent enhancement of average index of refraction from 450 nm to 1100 nm, with no appreciable accompanying increase in absorption. Second-harmonic generation and phase-contrast imaging indicate that the enhancement is correlated to ferroelectric domains and highly localized at the supercrystal lattice sites. Implementing a two-component effective medium model, the response of each lattice site is found to be compatible with giant broadband refraction.

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Papathanasiou, T. K., A. B. Movchan und D. Bigoni. „Wave reflection and transmission in multiply stented blood vessels“. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 473, Nr. 2202 (Juni 2017): 20170015. http://dx.doi.org/10.1098/rspa.2017.0015.

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Closed circulatory systems display an exquisite balance between vascular elasticity and viscous fluid effects, to induce pulse-smoothing and avoid resonance during the cardiac cycle. Stents in the arterial tree alter this balance through stiffening and because a periodic structure is introduced, capable of interacting with the fluid in a complex way. While the former feature has been investigated, the latter received no attention so far. But periodic structures are the building blocks of metamaterials, known for their ‘non-natural’ behaviour. Thus, the investigation of a stent's periodic microstructure dynamical interactions is crucial to assess possible pathological responses. A one-dimensional fluid–structure interaction model, simple enough to allow an analytical solution for situations of interest involving one or two interacting stents, is introduced. It is determined: (i) whether or not frequency bands exist in which reflected blood pulses are highly increased and (ii) if these bands are close to the characteristic frequencies of arteries and finally, (iii) if the internal structure of the stent can sensibly affect arterial blood dynamics. It is shown that, while the periodic structure of an isolated stent can induce anomalous reflection only in pathological conditions, the presence of two interacting stents is more critical, and high reflection can occur at frequencies not far from the physiological values.

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Dissertationen zum Thema "Anomalous reflection and transmission"

Kourchi, Hasna. „Μétaréseaux pοur la réflexiοn et la transmissiοn anοrmales de frοnts d’οnde acοustique dans l’eau“. Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH36.

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Un métaréseau est un assemblage périodique de diffuseurs conçu pour réfléchir ou réfracter une onde vers une direction anormale, non prévue par les lois de Snell-Descartes. Dans ce travail, nous avons conçu, fabriqué et caractérisé expérimentalement de tels métaréseaux pour le contrôle des ondes ultrasonores dans l’eau, en utilisant des tubes et des cylindres en laiton ainsi que des supports plastiques imprimés en 3D. Ces métaréseaux permettent de rediriger un front d'onde incident vers une direction arbitraire souhaitée, avec une efficacité élevée (proche de 100 %), aussi bien en réflexion sur une surface (comme l’interface eau/air) qu'en transmission. L’approche théorique repose sur les principes de la diffraction de Bragg et sur les interactions constructives et destructives des ondes. Les résultats de cette thèse démontrent l'efficacité des métaréseaux à induire des phénomènes acoustiques tels que la rétro-réflexion et la réponse asymétrique, grâce à l’utilisation de structures résonantes et non résonantes, validées par des simulations par éléments finis et des expérimentations. Cette recherche ouvre de nouvelles perspectives pour la manipulation des ondes acoustiques sous-marines, avec des applications potentielles dans les domaines de la détection, de l'absorption et de la réflexion des ondes en milieu marin
A metagrating is a periodic assembly of scatterers designed to reflect or refract a wave toward an anomalous direction, not predicted by Snell's law. In this work, we designed, fabricated, and experimentally characterized such metagratings for the control of ultrasonic waves in water, using brass tubes and cylinders as well as 3D-printed plastic supports. These metagratings enable the redirection of an incident wavefront to an arbitrarily desired direction with high efficiency (close to 100%), both in reflection on a surface (e.g., the water/air interface) and in transmission. The theoretical approach is based on the principles of Bragg diffraction and constructive and destructive wave interactions. The results of this thesis demonstrate the efficiency of metagratings in inducing acoustic phenomena such as retroreflection and asymmetric wave response, achieved through the use of resonant and non-resonant structures, validated by finite element simulations and experiments. This research opens new perspectives for the manipulation of underwater acoustic waves, with potential applications in the fields of wave detection, absorption, and reflection in marine environments

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Dyer, Benjamin Charles. „Seismic transmission and reflection tomography“. Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47042.

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Burdick, Scott A. (Scott Anthony). „Teleseismic transmission and reflection tomography“. Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87516.

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Thesis: Ph. D. in Geophysics, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references.
The aim of seismic tomography is to determine a model of Earth properties that best explain observed seismic data. In practice, the limitations placed on our observations and computational capabilities force us to make a number of decisions about the scales and parameterizations of models, the nature of the data considered, and the approximations to wave propagation that connect the two. This thesis will consider three divergent approaches to seismic tomography spanning different representations of Earth structure at different scales, using different parts of the teleseismic wavefield, and solving the inverse problem with different approximations to the wave equation and different optimization methods. In choosing each of these approaches, we address two major decisions that influence the tomographic process: First, what relative value do we place on an less approximate treatment of wave physics versus the ability to incorporate as much information as possible in our inversion? Second, how can we use novel data to better constrain smooth seismic structure in regions that were previously unresolved? The first project presents a global ray-theoretical P-wave model that encompasses millions of traveltime picks. In this inversion, the addition of data from the dense USArray Transportable Array to global catalog data allows us to image the structure of the Eastern United States with unprecedented resolution and make a robust evaluation of the spatial scales of the heterogeneity. The second project develops a finite frequency approach to turning wave transmission tomography using a computationally efficient one-way wave propagation on curvilinear coordinates. The use of overturning coordinate systems allows for the application of wave equation tomography to phases previously unused in other oneway schemes. The final project presents a novel approach to wave-equation teleseismic reflection tomography using free surface multiples. The use of these multiply reflected phases helps to localize heterogeneity in the model to within layers of Earth structure. This project spans the final two chapters and includes the theoretical developments and an inaugural application to SsPmp data from the Hi-CLIMB array in Tibet.
by Scott A. Burdick.
Ph. D. in Geophysics

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Chen, Yu. „Spherical wave reflection and transmission“. Thesis, Open University, 1991. http://oro.open.ac.uk/57346/.

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This study is concerned with the reflection and transmission of spherical waves at a plane interface between two different media. The phenomenon of the reflection and transmission of spherical waves has been studied by means of analytical methods, numerical computation, and experimental tests. A new integral representation for a spherical wave is obtained by transforming Lamb/Sommerfeld's integral representation. The new integral has no singularity so it allows more accurate numerical integration. A new proof of Lamb/Sommerfeld's integral representation for a spherical wave is presented based on the new integral. By using the new form of solutions for reflected waves and existing solutions for transmitted waves, numerical studies have been carried out to examine. the phenomenon of reflection and transmission. of spherical waves at plane surfaces of discontinuity in material properties. It is shown that the effective critical angle for the total reflection of a spherical wave is greater than that of a plane wave at a hard boundary, and that when the source height increases the effective critical angle for the total reflection of a spherical wave tends to that of a plane wave. It is shown that recent predictions of spherical wave reflection and transmission coefficients greater than 1 at normal incidence under certain condition are probably due to numerical integration error. It also has been found that for spherical wave reflection and transmission, the time average energy flux, normal to a plane parallel to the plane of discontinuity, may locally be in the direction opposite to that of the direction of energy transmission over the plane as a whole. This so-called "backward wave" occurs in an interference between the direct and reflected waves, as well as in a transmitted wave. An indirect test on the theory has been performed to check the pressure field, above a rigid boundary, predicted by the spherical wave theory. Theoretical and experimental results were in good agreement.

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Lee, Seung-Kyu. „Wave reflection, transmission and propagation in structural waveguides“. Thesis, University of Southampton, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430485.

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Baig, Adam Mirza. „Reflection and transmission problems in vertically inhomogeneous elastic media“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0017/MQ47005.pdf.

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Weis, R. Stephen. „Electromagnetic transmission and reflection characteristics of anisotropic multilayered structures“. Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/13546.

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Chen, Jianbing James 1971. „Transmission and reflection properties of layered left-handed materials“. Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38681.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2007.
Includes bibliographical references (p. 179-189).
This thesis is concerned with the reflection and transmission properties of layered left-handed materials (LHM). In particular, the reflection properties of (LHM) slabs are studied for the Goos-Hanchen (GH) lateral shift phenomenon. We demonstrate a unique GH lateral shift phenomenon, which shows that both positive and negative shifts can be achieved using the same LHM slab configuration. This phenomenon is different from previously established cases where the GH lateral shift can be only negative or only positive when different LHM slab configurations are used. We also show that there exist two distinct cases with this unique phenomenon. One case has two regions of incident angles where the GH lateral shift directions are different, while another case has three regions with alternated GH shift directions. A generalized analytical formulation for analyzing the GH lateral shift direction is provided, which reveals that this unique phenomenon is related to the relative amplitudes of the growing and decaying evanescent waves inside the LHM slabs. The energy flux patterns within LHM slabs are further studied to show the influence of the evanescent waves on the GH shift direction change.
(cont.) Furthermore, the transmission property of LHM slabs are studied on the finite slabs' maging capability. First, the development of the numerical simulation tool - the Finite-Difference Time-Domain method (FDTD) - investigates the ability of the method to model a perfect lens made of a slab of homogeneous LHM. It is shown that because of the frequency dispersive nature of the medium and the time discretization, an inherent mismatch in the constitutive parameters exists between the slab and its surrounding medium. This mismatch in the real part of the permittivity and permeability is found to have the same order of magnitude as the losses typically used in numerical simulations. Hence, when the LHM slab is lossless, this mismatch is shown to be the main factor contributing to the image resolution loss of the slab. In addition, finite-size LHM slabs are studied both analytically and numerically since they have practical importance in the actual experiments. The analytical method is based on Huygens' principles using truncated current sheets that cover only the apertures of the slabs. It is shown that the main effects on the images' spectra due to the size of the slabs can be predicted by the proposed analytical method, which can, therefore, be used as a fast alternative to numerical simulations.
(cont.) Furthermore, the property of negative energy streams at the image plane is also investigated. This unique property is found to be due to the interactions between propagating and evanescent waves and can only occur with LHM slabs, of both finite-size and infinite size. The last part of the thesis deals with multi-layered media for the application to antenna isolations. The setup is with two horn antennas located beneath the ground plane with 10 A distance apart. In order to reduce the coupling between antennas, multi-layered media placed on top of the ground plane need to be designed to suppress the fields. After the problem is simplified to the dipole antenna coupling in infinite slabs, the method to evaluate the fields inside layered media is presented. This method obtains the spectral domain Green's function first and then transforms the fields to the spatial domain using the Sommerfeld-type integration. After the method is validated using right-handed materials (RHM) from references, it is extended to include media like LHM as well as p. negative material and : negative material . The validation with these materials are done by comparing the results with CST microwave studio simulations. The first configuration for the antenna isolation design if one layer slab backed by the grounded plane. Two different approaches are used to find the optimum slab parameters for the isolation.
(cont.) One approach is to use Genetic Algorithm (GA) to optimize the slab's constitutive parameters and the thickness for a minimum coupling level. The other approach is to develop an analytic asymptotic expression for the field, and then used the expression to design the slab parameters for the best isolation. We conclude that both approaches yield the same design for the given configuration. The effectiveness of the design is also validated on a grounded finite slab, which is the representation of the actual application. Finally, multi-layered media for the antenna isolation is studied. GA method is applied with an optimization scheme tailed for a five layered structure. We show that GA converges very fast to the solution and the result yields satisfactory isolation between the antennas.
by Jianbing James Chen.
Ph.D.

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Cebrecos, Ruiz Alejandro. „Transmission, reflection and absorption in Sonic and Phononic Crystals“. Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/56463.

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[EN] Phononic crystals are artificial materials formed by a periodic arrangement of inclusions embedded into a host medium, where each of them can be solid or fluid. By controlling the geometry and the impedance contrast of its constituent materials, one can control the dispersive properties of waves, giving rise to a huge variety of interesting and fundamental phenomena in the context of wave propagation. When a propagating wave encounters a medium with different physical properties it can be transmitted and reflected in lossless media, but also absorbed if dissipation is taken into account. These fundamental phenomena have been classically explained in the context of homogeneous media, but it has been a subject of increasing interest in the context of periodic structures in recent years as well. This thesis is devoted to the study of different effects found in sonic and phononic crystals associated with transmission, reflection and absorption of waves, as well as the development of a technique for the characterization of its dispersive properties, described by the band structure. We start discussing the control of wave propagation in transmission in conservative systems. Specifically, our interest is to show how sonic crystals can modify the spatial dispersion of propagating waves leading to control the diffractive broadening of sound beams. Making use of the spatial dispersion curves extracted from the analysis of the band structure, we first predict zero and negative diffraction of waves at frequencies close to the band-edge, resulting in collimation and focusing of sound beams in and behind a 3D sonic crystal, and later demonstrate it through experimental measurements. The focusing efficiency of a 3D sonic crystal is limited due to the strong scattering inside the crystal, characteristic of the diffraction regime. To overcome this limitation we consider axisymmetric structures working in the long wavelength regime, as a gradient index lens. In this regime, the scattering is strongly reduced and, in an axisymmetric configuration, the symmetry matching with acoustic sources radiating sound beams increase its efficiency dramatically. Moreover, the homogenization theory can be used to model the structure as an effective medium with effective physical properties, allowing the study of the wave front profile in terms of refraction. We will show the model, design and characterization of an efficient focusing device based on these concepts. Consider now a periodic structure in which one of the parameters of the lattice, such as the lattice constant or the filling fraction, gradually changes along the propagation direction. Chirped crystals represent this concept and are used here to demonstrate a novel mechanism of sound wave enhancement based on a phenomenon known as "soft" reflection. The enhancement is related to a progressive slowing down of the wave as it propagates along the material, which is associated with the group velocity of the local dispersion relation at the planes of the crystal. A model based on the coupled mode theory is proposed to predict and interpret this effect. Two different phenomena are observed here when dealing with dissipation in periodic structures. On one hand, when considering the propagation of in-plane sound waves in a periodic array of absorbing layers, an anomalous decrease in the absorption, combined with a simultaneous increase of reflection and transmission at Bragg frequencies is observed, in contrast to the usual decrease of transmission, characteristic in conservative periodic systems at these frequencies. For a similar layered media, backed now by a rigid reflector, out-of-plane waves impinging the structure from a homogeneous medium will increase dramatically the interaction strength. In other words, the time delay of sound waves inside the periodic system will be considerably increased resulting in an enhanced absorption, for a broadband spectral range.
[ES] Los cristales fonónicos son materiales artificiales formados por una disposición periódica de inclusiones en un medio, pudiendo ambos ser de carácter sólido o fluido. Controlando la geometría y el contraste de impedancias entre los materiales constituyentes se pueden controlar las propiedades dispersivas de las ondas. Cuando una onda propagante se encuentra un medio con diferentes propiedades físicas puede ser transmitida y reflejada, en medios sin pérdidas, pero también absorbida, si la disipación es tenida en cuenta. La presente tesis está dedicada al estudio de diferentes efectos presentes en cristales sónicos y fonónicos relacionados con la transmisión, reflexión y absorción de ondas, así como el desarrollo de una técnica para la caracterización de sus propiedades dispersivas, descritas por la estructura de bandas. En primer lugar, se estudia el control de la propagación de ondas en transmisión en sistemas conservativos. Específicamente, nuestro interés se centra en mostrar cómo los cristales sónicos son capaces de modificar la dispersión espacial de las ondas propagantes, dando lugar al control del ensanchamiento de haces de sonido. Haciendo uso de las curvas de dispersión espacial extraídas del análisis de la estructura de bandas, se predice primero la difracción nula y negativa de ondas a frecuencias cercanas al borde de la banda, resultando en la colimación y focalización de haces acústicos en el interior y detrás de un cristal sónico 3D, y posteriormente se demuestra mediante medidas experimentales. La eficiencia de focalización de un cristal sónico 3D está limitada debido a las múltiples reflexiones existentes en el interior del cristal. Para superar esta limitación se consideran estructuras axisimétricas trabajando en el régimen de longitud de onda larga, como lentes de gradiente de índice. En este régimen, las reflexiones internas se reducen fuertemente y, en configuración axisimétrica, la adaptación de simetría con fuentes acústicas radiando haces de sonido incrementa la eficiencia drásticamente. Además, la teoría de homogenización puede ser empleada para modelar la estructura como un medio efectivo con propiedades físicas efectivas, permitiendo el estudio del frente de ondas en términos refractivos. Se mostrará el modelado, diseño y caracterización de un dispositivo de focalización eficiente basado en los conceptos anteriores. Considérese ahora una estructura periódica en la que uno de los parámetros de la red, sea el paso de red o el factor de llenado, cambia gradualmente a lo largo de la dirección de propagación. Los cristales chirp representan este concepto y son empleados aquí para demostrar un mecanismo novedoso de incremento de la intensidad de la onda sonora basado en un fenómeno conocido como reflexión "suave". Este incremento está relacionado con una ralentización progresiva de la onda conforme se propaga a través del material, asociado con la velocidad de grupo de la relación de dispersión local en los planos del cristal. Un modelo basado en la teoría de modos acoplados es propuesto para predecir e interpretar este efecto. Se observan dos fenómenos diferentes al considerar pérdidas en estructuras periódicas. Por un lado, si se considera la propagación de ondas sonoras en un array periódico de capas absorbentes, cuyo frente de ondas es paralelo a los planos del cristal, se produce una reducción anómala en la absorción combinada con un incremento simultáneo de la reflexión y transmisión a las frecuencias de Bragg, de forma contraria a la habitual reducción de la transmisión, característica de sistemas periódicos conservativos a estas frecuencias. En el caso de la misma estructura laminada en la que se cubre uno de sus lados mediante un reflector rígido, la incidencia de ondas sonoras desde un medio homogéneo, cuyo frente de ondas es perpendicular a los planos del cristal, produce un gran incremento de la fuerza de
[CAT] Els cristalls fonònics són materials artificials formats per una disposició d'inclusions en un medi, ambdós poden ser sòlids o fluids. Controlant la geometría i el contrast d'impedàncies dels seus materials constituents, és poden controlar les propietats dispersives de les ondes, permetent una gran varietatde fenòmens fonamentals interessants en el context de la propagació d'ones. Quan una ona propagant troba un medi amb pèrdues amb propietats físiques diferents es pot transmetre i reflectir, però també absorbida si la dissipació es té en compte. Aquests fenòmens fonamentals s'han explicat clàssicament en el context de medis homogenis, però també ha sigut un tema de creixent interés en el context d'estructures periòdiques en els últims anys. Aquesta tesi doctoral tracta de l'estudi de diferents efectes en cristalls fonònics i sònics lligats a la transmissió, reflexió i absorció d'ones, així com del desenvolupament d'una tècnica de caracterització de les propietats dispersives, descrites mitjançant la estructura de bandes. En primer lloc, s'estudia el control de la propagació ondulatori en transmissió en sistemes conservatius. Més específicament, el nostre interés és mostrar com els cristalls sonors poden modificar la dispersió espacial d'ones propagants donant lloc al control de l'amplària per difracció dels feixos sonors. Mitjançant les corbes dispersió espacial obtingudes de l'anàlisi de l'estructura de bandes, es prediu, en primer lloc, la difracció d'ones zero i negativa a freqüències próximes al final de banda. El resultat és la collimació i focalització de feixos sonors dins i darrere de cristalls de so. Després es mostra amb mesures experimentals. L'eficiència de focalització d'un cristall de so 3D està limitada per la gran dispersió d'ones dins del cristall, que és característic del règim difractiu. Per a superar aquesta limitació, estructures axisimètriques que treballen en el règim de llargues longituds d'ona, i es comporten com a lents de gradient d'índex. En aquest règim, la dispersió es redueix enormement i, en una configuració axisimètrica, a causa de l'acoblament de la simetría amb les fonts acústiques que radien feixos sonors, l'eficiència de radiació s'incrementa significativament. D'altra banda, la teoria d'homogeneïtzació es pot utilitzar per a modelar, dissenyar i caracteritzar un dispositiu eficient de focalització basat en aquests conceptes. Considerem ara una estructura periòdica en la qual un dels seus paràmetres de xarxa, com ara la constant de xarxa o el factor d'ompliment canvia gradualment al llarg de la direcció de propagació. Els cristalls chirped representen aquest concepte i s'utilitzen ací per a demostrar un mecanisme nou d'intensificació d'ones sonores basat en el fenòmen conegut com a reflexió "suau". La intensificació està relacionada amb la alentiment progressiva de l'ona conforme propaga al llarg del material, que està associada amb la velocitat de grup de la relació de dispersió local en els diferents plànols del cristall. Es proposa un model basat en la teoria de modes acoblats per a predir i interpretar este efecte. Dos fenòmens diferents cal destacar quan es tracta d'estructures periòdiques amb dissipació. Per un costat, al considerar la propagació d'ones sonores en el plànol en un array periòdic de capes absorbents, s'observa una disminució anòmala de l'absorció i es combina amb un augment simultani de reflexió i transmissió en les freqüències de Bragg que contrasta amb la usual disminució de transmissió, característica dels sistemes conservatius a eixes freqüències. Per a un medi similar de capes, amb un reflector rígid darrere, les ones fora del pla incidint l'estructura des de un medi homogeni, augmentaran considerablement la interacció. En altres paraules, el retràs temporal de les ones sonores dins del sistema periòdic augmentarà significativament produint un augmen
Cebrecos Ruiz, A. (2015). Transmission, reflection and absorption in Sonic and Phononic Crystals [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/56463
TESIS
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Borocin, F. „(Derivation of) reflection/transmission coefficients for fluid-saturated poroelastic sediments“. Thesis, University of Edinburgh, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.641793.

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The interpretation of reflection, transmission and conversion (RTC) coefficients in fluid-saturated porous rock is of utmost importance for the characterisation of hydrocarbon reservoirs. It has also been suggested that high-pressure pore-fluid is responsible for anomalously high (up to 0.15-0.25) values of reflection coefficients (deep crustal reflectors) in the lower crust, subduction zones and subglacial deforming sediments. In my thesis I consider the interaction of seismic waves at the interface between fluid-saturated poroelastic media, taking properly into account the effects of fluid-solid interaction. I derive dynamic equations for wave propagation in poro-elastic media and obtain an explicit wave decomposition in up- and down-going components. I then develop an algorithm to compute RTC coefficients at the interface between two arbitrary poro-elastic media, when possible pore-pressure discontinuity at the interface is taken into account. My algorithm is written in a matrix form allowing me to compute RTC coefficients for plane waves at all frequencies and all angles of incidence. This algorithm encompasses both visco-elastic and poro-elastic cases including the effects caused by partially sealed interface. Using numerical examples I show that my algorithm is consistent with (visco-)elastic case. It is designed in a matrix form suitable for conventional computations of multilayered stacks as used in the reflectivity method. A range of possible applications and extensions such as wave propagation in finely-layered fluid-saturated sediments are discussed.

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Bücher zum Thema "Anomalous reflection and transmission"

Lekner, John. Theory of reflection: Of electromagnetic and particle waves. Dordrecht: M. Nijhoff Publishers, 1987.

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James, Baker-Jarvis, und National Institute of Standards and Technology (U.S.), Hrsg. Transmission/reflection and short-circuit line methods for measuring permittivity and permeability. Boulder, Colo: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1992.

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Ben, Munk, und Lewis Research Center, Hrsg. The reflection and transmission properties of a triple band dichroic surface: Final technical report. Columbus, Ohio: The Ohio State University, ElectroScience Laboratory, 1990.

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Center, NASA Glenn Research, Hrsg. Acoustic reflection and transmission of 2-dimensional rotors and stators, including mode and frequency scattering effects. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Center, NASA Glenn Research, Hrsg. Broadband noise of fans-with unsteady coupling theory to account for rotor and stator reflection/transmission effects. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Weil, Claude. Intercomparison of permeability and permittivity measurements using the transmission/reflection method in 7 and 14 mm coaxial air lines. Boulder, Colo: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1997.

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Lekner, John. Theory of Reflection: Reflection and Transmission of Electromagnetic, Particle and Acoustic Waves. Springer, 2018.

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Lekner, John. Theory of Reflection: Reflection and Transmission of Electromagnetic, Particle and Acoustic Waves. Springer International Publishing AG, 2016.

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Buchteile zum Thema "Anomalous reflection and transmission"

Lu, Wei, und Ying Fu. „Reflection and Transmission“. In Springer Series in Optical Sciences, 73–106. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94953-6_3.

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Zaitsev, Alexander M. „Reflection and Transmission“. In Optical Properties of Diamond, 13–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04548-0_2.

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Cohen, Gary C. „Reflection-Transmission Analysis“. In Scientific Computation, 145–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04823-8_10.

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Hart, Bryan. „The Reflection Chart“. In Digital Signal Transmission, 23–36. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-9707-0_3.

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Garrett, Steven L. „Reflection, Transmission, and Refraction“. In Understanding Acoustics, 513–42. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_11.

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Abstract The behavior of one-dimensional waves propagating through media that are not homogeneous will be the focus of this chapter. We start with an examination of the behavior of planewaves impinging on a planar interface between two fluid media with different properties and then extend that analysis to multiple interfaces and to waves that impinge on such an interface from an angle that is not perpendicular to that surface. The extent of those boundaries separating regions with different acoustical properties will be much larger than the wavelength of the sound. Many cases to be examined here will assume that the extent of the boundary is infinite and the wave incident on such an interface will be both reflected back into the medium from which it originated and be transmitted into the second medium on the other side of the interface. This exploration concludes with consideration of wave propagation through a medium whose properties change slowly and continuously through space resulting in curved ray paths. If the variation of sound speed is linear with height or depth, then the ray paths are arcs of circles. Complicated sound speed profiles will be approximated by piecewise-linear segments that have constant sound speed gradients.

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Garrett, Steven L. „Reflection, Transmission, and Refraction“. In Understanding Acoustics, 603–33. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49978-9_11.

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Vistnes, Arnt Inge. „Reflection, Transmission and Polarization“. In Physics of Oscillations and Waves, 293–334. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72314-3_10.

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Wang, Gwo-Ching, und Toh-Ming Lu. „RHEED Reflection Mode“. In RHEED Transmission Mode and Pole Figures, 41–53. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-9287-0_4.

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Tsuchiya, Keiko, und María Dolores Pérez Murillo. „Conclusion: CLIL—Reflection and Transmission“. In Content and Language Integrated Learning in Spanish and Japanese Contexts, 403–7. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27443-6_16.

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Schmerr, Lester W. „Reflection and Transmission of Bulk Waves“. In Fundamentals of Ultrasonic Nondestructive Evaluation, 113–95. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30463-2_6.

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Konferenzberichte zum Thema "Anomalous reflection and transmission"

Rana, Sylvie, Yallanki Sai Sreenija und A. R. Harish. „Specular Reflection Reduction of passive RIS for Single Beam Anomalous Reflection“. In 2024 Second International Conference on Microwave, Antenna and Communication (MAC), 1–5. IEEE, 2024. https://doi.org/10.1109/mac61551.2024.10837082.

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LaMountain, Jacob, Amogh Raju, Daniel Wasserman und Viktor A. Podolskiy. „Enhancing light compression in photonic funnels with anomalous reflection“. In Metamaterials, Metadevices, and Metasystems 2024, herausgegeben von Nader Engheta, Mikhail A. Noginov und Nikolay I. Zheludev, 77. SPIE, 2024. http://dx.doi.org/10.1117/12.3027278.

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Han, Jialiang, und Hui Li. „A Broadband Large-angle Anomalous Reflection Phase Gradient Metasurface“. In 2024 International Applied Computational Electromagnetics Society Symposium (ACES-China), 1–3. IEEE, 2024. http://dx.doi.org/10.1109/aces-china62474.2024.10699835.

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Movahediqomi, Mostafa, Sravan K. R. Vuyyuru, Grigory Ptitcyn, Risto Valkonen, Do-Hoon Kwon und Sergei A. Tretyakov. „Simultaneous Perfect Anomalous Reflection and Angle-of-Arrival Sensing Using Patch Arrays“. In 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI), 1497–98. IEEE, 2024. http://dx.doi.org/10.1109/ap-s/inc-usnc-ursi52054.2024.10686489.

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Yue, Xiuli, Haiyan Xie, Kaihuai Wen, Quanfang Chen, Wenjiang Xu und Tiancheng Han. „Broadband Anomalous Reflection and Radar Cross Section Reduction Metasurface Based on Deep Learning“. In 2024 Photonics & Electromagnetics Research Symposium (PIERS), 1–7. IEEE, 2024. http://dx.doi.org/10.1109/piers62282.2024.10618137.

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Graglia, Roberto D., und Piergiorgio L. E. Uslengh. „Reflection and Transmission for Layered Composite Materials“. In 9th International Zurich Symposium and Technical Exhibition on Electromagnetic Compatibility, 83–87. IEEE, 1991. https://doi.org/10.23919/emc.1991.10781126.

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Tan, Zhen, Jianjia Yi, Badreddine Ratni und Shah Nawaz Burokur. „Anomalous Reflection or Refraction Based on Transmissive Metagratings with Few Meta-Atoms“. In 2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI). IEEE, 2023. http://dx.doi.org/10.1109/usnc-ursi52151.2023.10237714.

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Lemarchand, F., A. Sentenac und H. Giovannini. „Study of the resonant behavior of waveguide-gratings Increasing the angular tolerance of guided-mode filters“. In Diffractive Optics and Micro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/domo.1998.dmb.4.

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Studies of anomalies of the reflection and transmission curves of waveguide-gratings have demonstrated unique filtering capabilities of these structures. Vincent and Neviere [1] showed that the excitation of a leaky mode in the system can lead to 100% reflectance at a given wavelength under certain condition of symmetry. A comparative study of guided-mode resonance filters with classical multilayers design shows that the latter requires considerably more layers to yield equivalent narrow-band linewidths [2]. However, contrary to thin-films filters, waveguide-gratings are very sensitive to the angle of the incident wave. Hence, the narrow-band filter suffers significant reduction in the peak reflectance, even if the incident optical beam is wide [3].

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Chen, Hao, Zhen Guo Liu, Wei Jun Wu und Wei Bing Lu. „Graphene based Anomalous Reflection at Microwave frequencies“. In 2019 IEEE Asia-Pacific Microwave Conference (APMC). IEEE, 2019. http://dx.doi.org/10.1109/apmc46564.2019.9038867.

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Li, Zhiwei, Kun Lu, Lirong Huang, Li Min und Yali Sun. „High-Efficiency Anomalous Reflection by Continuous Metasurface“. In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/acpc.2014.ath3a.25.

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Berichte der Organisationen zum Thema "Anomalous reflection and transmission"

Isakson, Marcia J. High Frequency Acoustic Reflection and Transmission in Ocean Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612088.

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Isakson, Marcia J. High Frequency Acoustic Reflection and Transmission in Ocean Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2009. http://dx.doi.org/10.21236/ada531414.

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Isakson, Marcia J. High Frequency Acoustic Reflection and Transmission in Ocean Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada541171.

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Isakson, Marcia J. High Frequency Acoustic Reflection and Transmission in Ocean Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2011. http://dx.doi.org/10.21236/ada571663.

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Hurricane, O. A., und P. L. Miller. Shock transmission and reflection from a material interface and subsequent reflection from a hard boundary. Office of Scientific and Technical Information (OSTI), November 1998. http://dx.doi.org/10.2172/6132.

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Aldridge, David F. Reflection and Transmission of Plane Electromagnetic Waves by a Geologic Layer. Office of Scientific and Technical Information (OSTI), April 2017. http://dx.doi.org/10.2172/1367459.

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Deibele, C. Calculation fo the Reflection and Transmission Coefficients for Gradual Tapered Waveguide Structures. Office of Scientific and Technical Information (OSTI), Januar 1999. http://dx.doi.org/10.2172/1967497.

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Abeyaratne, Rohan, und James K. Knowles. Reflection and Transmission of Waves from an Interface with a Phase- Transforming Solid. Fort Belvoir, VA: Defense Technical Information Center, September 1991. http://dx.doi.org/10.21236/ada242455.

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Oughston, Kurt. The Asymptotic Theory of the Reflection and Transmission of a Pulsed Electromagnetic Beam Field at a Planar Interface Separating Two Dispersive Media. Fort Belvoir, VA: Defense Technical Information Center, März 1993. http://dx.doi.org/10.21236/ada269033.

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Bruce. L51642 Field Nondestructive Examination of ERW Pipe Seams. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), Juni 1991. http://dx.doi.org/10.55274/r0010587.

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Electric resistance welded (ERW) pipe has been used in the natural gas transmission industry for many years. The Department of Transportation (DOT) has recently expressed interest in the integrity of the weld seam in pipelines made from ERW pipe that was manufactured prior to 1970. Specifically, the DOT has requested that natural gas transmission and hazardous liquid pipeline operators determine whether or not their pipelines that meet this description require hydrostatic proof testing. The initial concern from the DOT was for seam weld selective corrosion, although reference has since been made to growth of manufacturing discontinuities in the ERW seam. Early ERW pipe was manufactured using either direct current or low-frequency alternating current, processes that were prone to producing incomplete fusion discontinuities. These discontinuities (also referred to as cold welds, penetrators, etc.), if present in a pipeline, can grow under normal service or under upset operating conditions resulting in leaks or ruptures. There exists a need for a method that a pipeline operator could use to demonstrate the integrity of pipelines that were made from this older ERW pipe other than hydrostatic testing, which is expensive and potentially harmful to pipeline integrity. The use of a nondestructive-examination (NDE) technique would enable an operator to sample the integrity of a suspect pipeline during other routine in-service maintenance operations without the need for hydrostatic testing. The detection of incomplete fusion discontinuities is difficult if not impossible with conventional NDE techniques. The intimate mechanical contact between compressed surfaces causes a small amount of reflection and a large amount of transmission of ultrasonic signals. Recently however, several ultrasonic techniques have been introduced to study these types of discontinuities in resistance spot welds and inertia friction welds. These new techniques are based on ultrasonic spectroscopy, that is, the frequency dependence of the various ultrasonic interfacial parameters. These parameters include reflection and transmission coefficients and the frequency dependence of ultrasonic volumetric parameters (e.g., velocity and attenuation).

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