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Journal articles on the topic 'Reflection coefficient'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Mallick, Subhashis. "A simple approximation to the P‐wave reflection coefficient and its implication in the inversion of amplitude variation with offset data." GEOPHYSICS 58, no. 4 (1993): 544–52. http://dx.doi.org/10.1190/1.1443437.

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I derive an approximate formula for the plane P‐wave reflection coefficient as a function of ray‐parameter. The approximation shows that the behavior of the P‐wave reflection coefficient at nonnormal angles of incidence is mainly controlled by two parameters: (1) [Formula: see text], the fluid‐fluid reflection coefficient (i.e., the reflection coefficient when the S‐wave velocities in both media are set to zero) and (2) Δμ/ρ, the ratio of the contrast in shear moduli to the average bulk density. I also show that the other formulas for the P‐wave reflection coefficient given by R. Bortfeld and

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2

Hametner, Bernhard, Hannah Kastinger, and 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, no. 11 (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

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3

Molchina, Nina A. "The Influence of Reflected Light on the Assessment of the Quality of Daylighting in Rooms with Vertical Windows." Issue 01-2024, no. 01-2024 (February 2024): 39–44. http://dx.doi.org/10.33383/2023-066.

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The light distribution nature determines the quality of luminous environment created by the daylight in the room. How the daylight flux received through the window will be distributed throughout the room depends on the reflectivity of the enclosing surfaces. However, the efficiency of using the reflectivity of the material is determined not only by the value of the reflection coefficient, but is a complex function depending on the geometric parameters of the room, the configuration and characteristics of the light openings, the ratio of the reflection coefficients of various surfaces of the ro

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4

Skopintseva, Lyubov, Milana Ayzenberg, Martin Landrø, Tatyana Nefedkina, and Arkady M. Aizenberg. "Long-offset AVO inversion of PP reflections from plane interfaces using effective reflection coefficients." GEOPHYSICS 76, no. 6 (2011): C65—C79. http://dx.doi.org/10.1190/geo2010-0079.1.

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A conventional amplitude variation with offset (AVO) inversion is based on geometrical seismics which exploit plane-wave reflection coefficients to describe the reflection phenomenon. Widely exploited linearizations of plane-wave coefficients are mostly valid at pre-critical offsets for media with almost flat and weak-contrast interfaces. Existing linearizations do not account for the seismic frequency range by ignoring the frequency content of the wavelet, which is a strong assumption. Plane-wave reflection coefficients do not fully describe the reflection of seismic waves at near-critical an

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5

Logoglu, Faruk, Stuti Surani, and Marek Flaska. "Investigating the Thickness-Dependent Scintillator-PMT Interface Reflection Coefficients with GAGG:Ce³⁺ Crystals Using the Dual-PMT Setup." EPJ Web of Conferences 288 (2023): 10015. http://dx.doi.org/10.1051/epjconf/202328810015.

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Recently, it has been shown through both Monte Carlo simulations and experiments that scintillator-PMT interface reflection coefficients could depend on crystal thickness. It has been argued that the thickness-dependency on the interface reflection coefficient is a result of bulk attenuation and surface reflections. So far, only LYSO:Ce3+ scintillators have been tested to investigate thickness-dependent reflection coefficients. In this work, the simulations and experiments are extended to GAGG:Ce3+ crystals. Moreover, a new experimental technique (the dualPMT setup) has been tested to measure

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6

Rotholz, Ersch. "A reflection coefficient bridge." IEEE Transactions on Instrumentation and Measurement IM-36, no. 1 (1987): 129–31. http://dx.doi.org/10.1109/tim.1987.6312646.

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7

Bondarenko, A. S., A. S. Borovkov, I. M. Malay, and V. A. Semyonov. "State primary standard of units of complex reflection coefficient and complex transmission coefficient in waveguide paths in the frequency range from 2.14 to 178.4 GHz GET 219-2024." Izmeritel`naya Tekhnika, no. 7 (September 5, 2024): 4–13. http://dx.doi.org/10.32446/0368-1025it.2024-7-4-13.

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Measurement of complex reflection coefficients and complex transmission coefficients of radio engineering devices in waveguide paths is widely used in radar and radio navigation in the development, production, testing and operation of microwave devices and components. These parameters characterize the quality of matching of transmit-receive paths at ultra-high frequencies. Before the introduction of the State primary standard of units of complex reflection coefficient and complex transmission coefficient in waveguide paths in the frequency range from 2.14 to 178.4 GHz GET 219-2024, metrologica

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8

Araki, Susumu, Daiki Watanabe, Shin-ichi Kubota, and Masaya Hashida. "EVALUATION OF HYDRAULIC PERFORMANCE OF WAVE DISSIPATING BLOCK USING POROSITY." Coastal Engineering Proceedings, no. 36v (December 31, 2020): 29. http://dx.doi.org/10.9753/icce.v36v.papers.29.

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The reflection and transmission of wave dissipating work mainly depend on the shape and porosity of wave dissipating block. However, the influence of the shape and porosity of wave dissipating block on the reflection and transmission has not been investigated sufficiently. The purpose of this study is to investigate the influence of the porosity of wave dissipating block on the reflection and transmission coefficients through a series of hydraulic experiments where four kinds of wave dissipating blocks were used. Wave dissipating blocks with smaller porosity provided a larger reflection coeffi

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9

Danilov, V. N. "ON THE PECULIARITIES OF REFLECTION OF SHEAR WAVES WITH LINEAR POLARIZATION FROM THE ROUGH SURFACE OF A CRACK." Kontrol'. Diagnostika, no. 313 (July 2024): 24–30. http://dx.doi.org/10.14489/td.2024.07.pp.024-030.

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The reflection coefficient of shear waves with SV- and SH-linear polarization from a statistically inhomogeneous surface consisting of scattering linear elements with a feature of their height distribution according to the normal law in a two-dimensional approximation is estimated. The estimation of the reflection coefficients in the reverse and forward directions is based on the calculation of the reflected wave energy flow propagating from an inhomogeneous surface averaged over the possible values of the height of the reflecting elements. It is theoretically shown and confirmed experimentall

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10

van der Baan, Mirko, and Dirk Smit. "Amplitude analysis of isotropic P-wave reflections." GEOPHYSICS 71, no. 6 (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. Ampli

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11

Hametner, Bernhard, Hannah Kastinger, and Siegfried Wassertheurer. "P138 Modelling and Simulation of Pressure Re-reflections at the Aortic Valve Using Difference Equations." Artery Research 25, S1 (2019): S176. http://dx.doi.org/10.2991/artres.k-191224.161.

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Abstract Introduction The concept of re-reflections of blood pressure waves at the heart has been neglected in most models and is only poorly understood so far. Therefore, the aim of this work was to develop a simple mathematical model which is capable to represent the effects of wave travel, wave reflection as well as re-reflection at the aortic valve. Methods A mathematical model based on difference equations has been developed. The equation for the backward travelling pressure waves includes several terms, where the forward pressure is multiplied by a specific reflection coefficient and is

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12

Fedyukhin, L. A., A. V. Gorchakov, and E. A. Kolosovsky. "Invariants of the Reflection Coefficient." Optics and Spectroscopy 128, no. 2 (2020): 257–63. http://dx.doi.org/10.1134/s0030400x20020095.

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13

Basak, Soumen, and Parthasarathi Majumdar. "Reflection coefficient for superresonant scattering." Classical and Quantum Gravity 20, no. 13 (2003): 2929–36. http://dx.doi.org/10.1088/0264-9381/20/13/335.

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14

Quintal, Beatriz, Stefan M. Schmalholz, and Yuri Y. Podladchikov. "Impact of fluid saturation on the reflection coefficient of a poroelastic layer." GEOPHYSICS 76, no. 2 (2011): N1—N12. http://dx.doi.org/10.1190/1.3553002.

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The impact of changes in saturation on the frequency-dependent reflection coefficient of a partially saturated layer was studied. Seismic attenuation and velocity dispersion in partially saturated (i.e., patchy saturated) poroelastic media were accounted for by using the analytical solution of the 1D White’s model for wave-induced fluid flow. White’s solution was applied in combination with an analytical solution for the normal-incidence reflection coefficient of an attenuating layer embedded in an elastic or attenuating background medium to investigate the effects of attenuation, velocity dis

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15

Arntsen, B., A. Kritski, B. Ursin, and L. Amundsen. "Shot-profile true amplitude crosscorrelation imaging condition." GEOPHYSICS 78, no. 4 (2013): S221—S231. http://dx.doi.org/10.1190/geo2012-0211.1.

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The U/D imaging condition for shot profile migration can be used to estimate the angle dependent reflection coefficient, but is difficult to implement numerically because of the spectral division involved. Most techniques for stabilizing the division require a damping factor which might be difficult to estimate and which also introduces bias into the final result. A stable result can be achieved by approximating the imaging condition with a crosscorrelation of the up- and downgoing wavefields at zero time lag, but this will lead to incorrect amplitude-versus-angle (AVA) behavior of the estimat

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16

Du, Zhou, Ville Viikari, Juha Ala-Laurinaho, Aleksi Tamminen, and Antti V. Raisanen. "ANTENNA PATTERN RETRIEVAL FROM REFLECTION COEFFICIENT MEASUREMENTS WITH REFLECTIVE LOADS." Progress In Electromagnetics Research 148 (2014): 15–22. http://dx.doi.org/10.2528/pier14050902.

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17

Полковников, В. Н., Н. И. Чхало, E. Meltchakov та ін. "Стабильные многослойные отражающие покрытия на длину волны lambda(HeI) = 58.4 nm для солнечного телескопа проекта КОРТЕС". Письма в журнал технической физики 45, № 3 (2019): 26. http://dx.doi.org/10.21883/pjtf.2019.03.47268.17369.

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AbstractMultilayer aluminum-based structures reflecting at λ(HeI) = 58.4 nm were studied. Spectral and angular dependences of the reflection coefficient of these coatings were determined using a laboratory reflectometer and at the ELETTRA and BESSY II synchrotrons. The optical characteristics of multilayer Ru/Al and Mo/Al mirrors with a protective MoSi_2 layer were found to be stable: the absolute change in the reflection coefficient within 18 months of storage in air was no larger than 1.5%. The peak near-normal reflection coefficient for Mo/Al mirrors at 58.4 nm was R = 26.1% with FWHM Δλ_0.

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18

Akinlami, J. O. "Reflection coefficient and optical conductivity of gallium nitride GaN." Semiconductor Physics Quantum Electronics and Optoelectronics 15, no. 3 (2012): 281–84. http://dx.doi.org/10.15407/spqeo15.03.281.

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19

Vavryuk, Václav, and Ivan Peník. "PP-wave reflection coefficients in weakly anisotropic elastic media." GEOPHYSICS 63, no. 6 (1998): 2129–41. http://dx.doi.org/10.1190/1.1444506.

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Approximate PP-wave reflection coefficients for weak contrast interfaces separating elastic, weakly transversely isotropic media have been derived recently by several authors. Application of these coefficients is limited because the axis of symmetry of transversely isotropic media must be either perpendicular or parallel to the reflector. In this paper, we remove this limitation by deriving a formula for the PP-wave reflection coefficient for weak contrast interfaces separating two weakly but arbitrarily anisotropic media. The formula is obtained by applying the first‐order perturbation theory

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20

Dolai, P. "Scattering of interface wave by bottom undulations in the presence of thin submerged vertical wall with a gap." International Journal of Applied Mechanics and Engineering 21, no. 2 (2016): 303–22. http://dx.doi.org/10.1515/ijame-2016-0019.

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AbstractIn this paper, the problem of interface wave scattering by bottom undulations in the presence of a thin submerged vertical wall with a gap is investigated. The thin vertical wall with a gap is submerged in a lower fluid of finite depth with bottom undulations and the upper fluid is of infinite height separated by a common interface. In the method of solution, we use a simplified perturbation analysis and suitable applications of Green’s integral theorem in the two fluid regions produce first-order reflection and transmission coefficients in terms of integrals involving the shape functi

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21

Kıymık, Erkan, and Ergun Erçelebi. "Metamaterial Design with Nested-CNN and Prediction Improvement with Imputation." Applied Sciences 12, no. 7 (2022): 3436. http://dx.doi.org/10.3390/app12073436.

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Metamaterials, which are not found in nature, are used to increase the performance of antennas with their extraordinary electromagnetic properties. Since metamaterials provide unique advantages, performance improvements have been made with many optimization algorithms. Objective: The article aimed to develop a deep learning model that, unlike traditional optimization algorithms, takes the desired reflection coefficients’ parameter as an input and gives the image of the corresponding metamaterial. Method: An amount of 29,722 metamaterial images and reflection coefficients corresponding to the m

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22

Xin, Chen, Tan Wenhui, and Wang Peng. "Effects of Geometrical Parameters on Stress Wave Propagation across the Rough Joint." Advances in Civil Engineering 2018 (August 27, 2018): 1–7. http://dx.doi.org/10.1155/2018/1364839.

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The contact surface of the rough joint has geometrical parameters as the joint matching coefficient (JMC) and the distribution pattern of the contact segments. The specimen used in the modified SHPB test got the artificial joint by sawing some notches on the surface contacted to the output bar. Different assemblies of the notches formed various contact areas and distribution patterns. Using the modified SHPB tests data, the altered thin-layer interface model was used to analyze the effects of geometrical parameters on one-dimensional stress wave transmission and energy dissipation across a sin

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23

Scheffer, Hans-Joachim, and Soren Kohlhase. "REFLECTION OF IRREGULAR WAVES AT PARTIALLY REFLECTING STRUCTURES INCLUDING OBLIQUE WAVE APPROACH." Coastal Engineering Proceedings 1, no. 20 (1986): 162. http://dx.doi.org/10.9753/icce.v20.162.

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The reflection of irregular seas is increasingly considered in coastal engineering and harbour design as well with respect to wave pattern at the structure and energy dissipation as regarding the dimensioning of structures exposed to waves. It becomes evident that the three-dimensional sea state (oblique wave approach, irregularity of the waves) at partially-reflecting structures of a complex design cannot be described by means of a constant reflection coefficient alone, as is common practice. This is due to the fact that the coefficient is largely frequency-dependent and the physically effect

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24

Sujantoko, G. A. Pramestika, M. Mustain, H. Ikhwani, and Y. S. Hadiwidodo. "Simulation of a Wave Hydrodynamic Numerical Model on a Single Vertical Porous Breakwater." IOP Conference Series: Earth and Environmental Science 1298, no. 1 (2024): 012007. http://dx.doi.org/10.1088/1755-1315/1298/1/012007.

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Abstract One of the problems in the coastal area is a change in the coastline in the form of a coastline retreat which results in the loss or damage of infrastructure and settlement facilities caused by extreme sea wave activity. One way to anticipate this problem is to build a breakwater. This research is focused on the effect of porosity and freeboard on the transmission and reflection of waves in a single vertical porous breakwater. Numerical modeling was done using a 3D Numerical Wave Tank (NWT) based on Smoothed Particle Hydrodynamic (SPH). The numerical model results show that the averag

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25

Cawley, P., M. J. S. Lowe, F. Simonetti, C. Chevalier, and A. G. Roosenbrand. "The variation of the reflection coefficient of extensional guided waves in pipes from defects as a function of defect depth, axial extent, circumferential extent and frequency." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 216, no. 11 (2002): 1131–43. http://dx.doi.org/10.1243/095440602761609498.

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The reflection coefficients of extensional guided modes from notches of different axial, circumferential and through-thickness extent in pipes of different diameters have been studied using finite element analysis. A selection of the predictions has also been validated by experiments. For part-thickness notches of a given circumferential extent and minimal axial extent, the reflection coefficient increases monotonically with depth at all frequencies, and increases with frequency at a given depth. When the wavelength is long compared to the pipe wall thickness, the reflection coefficient from p

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26

Poyyamozhi, Mukilan, Balasubramanian Murugesan, Narayanamoorthi Rajamanickam, Devesh Kr Pandey, and Ahmed Emara. "Transmission and Reflection Properties of Iron Pyrite-Epoxy Resin Composite for Electromagnetic Applications." Materials 17, no. 22 (2024): 5456. http://dx.doi.org/10.3390/ma17225456.

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This study examines the electromagnetic properties of a composite material composed of iron pyrite (FeS2) and epoxy resin, mixed in a 3:2 weight ratio to create a 10 cm3 cube. The research analyzes transmission and reflection coefficients and band gap parameters to determine its viability as an antenna substrate for electromagnetic wave applications. The composite displays a tunable band gap of 1.3 eV, enabling selective absorption and emission of electromagnetic radiation. The transmission coefficient achieved 90% throughout a frequency range of 1 GHz to 15 GHz, whilst the reflection coeffici

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27

Wang, Xing, Yun-Xia Wang, and Yu-Xian Li. "Quasi-periodic Andreev reflection in topological nodal-line semimetal–superconductor junctions." Journal of Applied Physics 132, no. 13 (2022): 134303. http://dx.doi.org/10.1063/5.0102989.

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The Andreev reflection in topological nodal-line semimetal–superconductor (TNLSM–SC) junctions is studied based on the Landauer–Büttiker formula combined with the non-equilibrium Green’s function method. It is found that the Andreev reflection coefficient can reach large values of several tens for a TNLSM–SC junction. In the energy gap, two new peaks for the Andreev reflection appear. Outside the energy gap, the Andreev reflection shows a quasi-periodic variation. With the incident energy increasing, the Andreev reflection decreases periodically. This phenomenon originates from the peculiar en

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28

Atkinson, D., and J. Geschiere. "Inverse scattering: an illicit reflection coefficient." Inverse Problems 2, no. 4 (1986): L51—L53. http://dx.doi.org/10.1088/0266-5611/2/4/003.

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29

Dettmer, Jan, Stan E. Dosso, and Charles W. Holland. "Full wave-field reflection coefficient inversion." Journal of the Acoustical Society of America 122, no. 6 (2007): 3327–37. http://dx.doi.org/10.1121/1.2793609.

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30

Juntunen, J. S., N. V. Kantartzis, and T. D. Tsiboukis. "Zero reflection coefficient in discretized PML." IEEE Microwave and Wireless Components Letters 11, no. 4 (2001): 155–57. http://dx.doi.org/10.1109/7260.916328.

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31

Thiebaux, Martial L. "Low-Frequency Kelvin Wave Reflection Coefficient." Journal of Physical Oceanography 18, no. 2 (1988): 367–72. http://dx.doi.org/10.1175/1520-0485(1988)018<0367:lfkwrc>2.0.co;2.

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32

Neidert, R. E. "Monolithic circuit for reflection coefficient measurement." IEEE Microwave and Guided Wave Letters 1, no. 8 (1991): 195–97. http://dx.doi.org/10.1109/75.84585.

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33

Delafkar, H., A. Pirhadi, and S. Karimian. "Design of Reflective Surface With Linear and Controllable Reflection Coefficient Phase." IEEE Antennas and Wireless Propagation Letters 16 (2017): 2546–49. http://dx.doi.org/10.1109/lawp.2017.2732027.

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34

Mikhailenko, Anastasia V., Konstantin G. Aksenov, Marina G. Kisteneva, Anna S. Akrestina, and Stanislav M. Shandarov. "Investigation of the spectral dependence of the reflection coefficient of the factory-assembled aluminum mirror for the Shimadzu UV-2700 spectrophotometer." Analysis and data processing systems, no. 2 (June 20, 2023): 89–100. http://dx.doi.org/10.17212/2782-2001-2023-2-89-100.

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In this paper, we present the results of experimental investigation of the spectral dependence of the aluminum mirror reflection coefficient in the operating range of 185…900 nm. The aluminum mirror is a part of the Specular Reflectance Measurement Attachment to the Shimadzu UV-2700 spectrophotometer. We used experimental data obtained on the same spectro-photometer for a standard incidence angle of 5° for the reflection coefficient of a fused silicon dioxide plate as a reference sample. This is because the spectral characteristics of the optical parameters of fused silicon dioxide determined

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35

Gao, Wenyang, Yan Zhang, Zhiming Zhao, and Zhiwen Cui. "Reflection and Transmission of Plane Waves at the Interface of Fluid and Porous Media with Seismoelectric Effect." Journal of Physics: Conference Series 2822, no. 1 (2024): 012070. http://dx.doi.org/10.1088/1742-6596/2822/1/012070.

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Abstract The relationship between energy flux reflection and transmission coefficient of seismoelectric plane waves in plane layered media and incident angle and frequency is studied. Pride equations is adopted to describe the coupling phenomenon between elastic waves and electromagnetic fields in subsurface fluid-saturated porous media. The Helmholtz decomposition is used to derive the energy flux expression for seismoelectric plane waves propagating in fluid-saturated porous media. It shows that the impermeable interface conditions have a great influence on the reflection and transmission co

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36

Kondo, Kosuke, Masayuki Akama, and Masahiko Isobe. "MEASUREMENT OF REFLECTION COEFFICIENT OF SEAWALL IN OMORA BAY." Coastal Engineering Proceedings 1, no. 20 (1986): 146. http://dx.doi.org/10.9753/icce.v20.146.

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Field investigations were performed in order to establish the reflecting characteristics of a steel sheet-piling type seawall and two vertical wave-dissipating type seawalls through directional wave measurements of wave reflection systems. A pre-designed line array of several capacitance-type wave gauges was used to measure the wave field just in front of the seawall, and the MMLM (Modified Maximum Likelifood Method) was applied for the calculation of the directional wave spectrum and the reflection coefficient. The estimated directional spectra demonstrated that the MMLM has high resolution p

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37

Shen, Zong-You, Ching-Jer Huang, and Kuan-Wen Liu. "Development and Applications of a Pressurized Water-Filled Impedance Tube." Sensors 22, no. 10 (2022): 3827. http://dx.doi.org/10.3390/s22103827.

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In this study, a pressurized, water-filled impedance tube (WFIT) was developed to measure the reflection coefficients of sound-absorbing materials under various hydrostatic pressures. The developed WFIT was calibrated using a two-microphone, three-parameter calibration method (3PCM). The accuracy and repeatability of the measured reflection coefficients for the water–air interface in the WFIT were determined by comparing these coefficients with corresponding theoretical reflection coefficients. The WFIT was then used to measure the acoustic reflection coefficient of a porous rubber specimen on

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38

Aghaei, Behrouz, Afshin Mohseni Arasteh, Kamran Lari, and Masoud Torabi Azad. "Numerical Modeling of Wave Reflection from Sloped Impermeable Seawalls Using the SPH Method: Case Study of Chabahar Port." Advances in Civil Engineering 2021 (December 2, 2021): 1–17. http://dx.doi.org/10.1155/2021/7382416.

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In this research, a comprehensive study is performed to investigate the interaction of regular waves with the impermeable seawall of the Chabahar port. First, a MIKE 21 SW model is used to transform the deep-water wave data to the nearshore zone. Then, the interaction of waves with the seawall is simulated using a well-known numerical smoothed particle hydrodynamics model named DualSPHysics. After validating the numerical results with the experimental data, a parametric study is performed to evaluate the effects of the wave height, wave period, and the slope of the seawall on the water level f

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39

Utkin, А. І., and А. А. Yushkanov. "Interaction of Electromagnetic H-wave with the thin Metal Film is Located on the Dielectric Substrate." Фізика і хімія твердого тіла 16, no. 2 (2015): 253–56. http://dx.doi.org/10.15330/pcss.16.2.253-256.

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Interaction of electromagnetic H-wave with thin metal film is located between two dielectric environments ε1, ε2 in the case of different incident angles of H-wave θ and in the case of different reflection coefficients q1 и q2 is calculated in this article. Behavior analysis of reflection coefficient R, transmission coefficient T and absorption coefficient A in the case of its frequency dependence y and variation dielectric permeability of its environments is done.

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40

Park, Daniel J., Prabhakar Pradhan, and Vadim Backman. "Enhancing the sensitivity of mesoscopic light reflection statistics in weakly disordered media by interface reflections." International Journal of Modern Physics B 30, no. 23 (2016): 1650155. http://dx.doi.org/10.1142/s0217979216501551.

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Reflection statistics have not been well studied for optical random media whose mean refractive indices do not match with the refractive indices of their surrounding media. Here, we theoretically study how this refractive index mismatch between a one-dimensional (1D) optical sample and its surrounding medium affects the reflection statistics in the weak disorder limit, when the fluctuation part of the refractive index [Formula: see text] is much smaller than the mismatch as well as the mean refractive index of the sample [Formula: see text]. In the theoretical derivation, we perform a detailed

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41

Alkhalidi, Mohamad, Noor Alanjari, and S. Neelamani. "Wave Interaction with Single and Twin Vertical and Sloped Slotted Walls." Journal of Marine Science and Engineering 8, no. 8 (2020): 589. http://dx.doi.org/10.3390/jmse8080589.

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The interaction between waves and slotted vertical walls was experimentally studied in this research to examine the performance of the structure in terms of wave transmission, reflection, and energy dissipation. Single and twin slotted barriers of different slopes and porosities were tested under random wave conditions. A parametric analysis was performed to understand the effect of wall porosity and slope, the number of walls, and the incoming relative wave height and period on the structure performance. The main focus of the study was on wave transmission, which is the main parameter require

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42

Zhou, Tao, Ming-hang Li, and Bing Li. "Delamination thickness measurement based on Stoneley wave in bilayered composite structure." Acta Acustica 7 (2023): 57. http://dx.doi.org/10.1051/aacus/2023054.

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Introduction: For composite structures, delamination usually occurs at the interface. Ultrasonic guided waves have been widely used to detect the delamination. However, most researches focus on the measurement of the delamination length along the interface, and the measurement of the delamination thickness is less studied. Method: In this paper, based on the characteristic that the Stoneley wave only propagates along the interface, the reflection coefficient of interaction between Stoneley wave and delamination is used to measure the delamination thickness. The effects of delamination thicknes

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Yanushkevich, V., D. Dauhiala, U. Pitolin, K. Babamuratov, and M. Urozov. "Determination of reflection coefficient contrast in medium over hydrocarbon accumulation." Journal of Physics: Conference Series 2697, no. 1 (2024): 012065. http://dx.doi.org/10.1088/1742-6596/2697/1/012065.

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Abstract The article analyses the method of searching for hydrocarbon accumulation on the basis of determining the reflection coefficient contrast. Experimental research on hydrocarbon accumulation of the Republic of Belarus is carried out. Was used a method for estimating the reflectivity of the medium over hydrocarbon accumulation under the influence of electromagnetic waves with linear polarization based on the contrast of reflection coefficients between the measurement points of the investigated profile and the calibration measurement point located outside accumulation. The anomalous behav

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Mahmoud, M. A., and G. A. Shalaby. "The cylindrical couette flow of a rarefied gas consisting of charged particles inside walls with arbitrary reflection coefficients." Canadian Journal of Physics 69, no. 12 (1991): 1429–40. http://dx.doi.org/10.1139/p91-212.

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A kinetic-theory treatment of the cylindrical Couette flow is considered. A generalization of the case of a surface with an arbitrary reflection coefficient that depends on the nature of the surface. In this paper we consider that the reflection coefficients of the inner and outer walls are different. A model kinetic equation of the BGK (Bhatnger–Gross–Krook) type is solved using the method of moments with a two-sided distribution function. The dependence of the velocity and shear stress on the reflection coefficient is obtained.

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Kozlova, N. S., E. A. Levashov, Ph V. Kiryukhantsev-Korneev, A. D. Sytchenko, and E. V. Zabelina. "The possibilities of multi-angle spectrophotometry for determining the parameters of films on single-layer structures." Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 25, no. 2 (2022): 154–63. http://dx.doi.org/10.17073/1609-3577-2022-2-154-163.

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Single-layer Ta-Si-C-N films on fused quartz substrates were made by direct current magnetron sputtering. The structural perfection of the film was investigated by X-ray diffraction analysis, scanning electron microscopy and optical emission spectroscopy of glow discharge. The optical parameters of the films were determined by the method of multi-angle spectrophotometry. Spectral dependences of the transmission coefficients of substrates and structures at normal light incidence in the wavelength range of 200—2500 nm are obtained. It is shown that the transmission spectrum of the sample has an

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Muñoz-Enano, J., P. Vélez, M. Gil, and F. Martín. "Microfluidic reflective-mode differential sensor based on open split ring resonators (OSRRs)." International Journal of Microwave and Wireless Technologies 12, no. 7 (2020): 588–97. http://dx.doi.org/10.1017/s1759078720000501.

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AbstractThis paper proposes a differential sensor based on a pair of open split ring resonators (OSRR) operating in reflection. The output signal is thus the differential reflection coefficient of both resonators, intimately related to their dielectric loading. Thus, for identical loads in both sensing resonators, the individual reflection coefficients are equal, thereby providing an ideally null output signal. By contrast, when unequal dielectric loads truncate the symmetry, the reflection coefficients are different, resulting in a differential output signal related to the level of asymmetry.

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Wang, Yu, Dehua Chen, Xueshen Cao, and Xiao He. "Theoretical and Experimental Studies of Acoustic Reflection of Bubbly Liquid in Multilayer Media." Applied Sciences 12, no. 23 (2022): 12264. http://dx.doi.org/10.3390/app122312264.

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Bubbly liquids are widely present in the natural environment and industrial fields, such as seawater near the ocean bottom, the multiphase flow in petroleum reservoirs, and the blood with bubbles resulting in decompression sickness. Therefore, accurate measurement of the gas content is of great significance for hydroacoustic physics, oil and gas resources exploration, and disease prevention and diagnosis. Trace bubbles in liquids can lead to considerable changes in the acoustic properties of gas–liquid two-phase media. Acoustic measurements can therefore be applied for trace bubble detection.

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Rüger, Andreas. "Variation of P-wave reflectivity with offset and azimuth in anisotropic media." GEOPHYSICS 63, no. 3 (1998): 935–47. http://dx.doi.org/10.1190/1.1444405.

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P-wave amplitudes may be sensitive even to relatively weak anisotropy of rock mass. Recent results on symmetry‐plane P-wave reflection coefficients in azimuthally anisotropic media are extended to observations at arbitrary azimuth, large incidence angles, and lower symmetry systems. The approximate P-wave reflection coefficient in transversely isotropic media with a horizontal axis of symmetry (HTI) (typical for a system of parallel vertical cracks embedded in an isotropic matrix) shows that the amplitude versus offset (AVO) gradient varies as a function of the squared cosine of the azimuthal

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KORVIN, G. "THE KURTOSIS OF REFLECTION COEFFICIENTS IN A FRACTAL SEQUENCE OF SEDIMENTARY LAYERS." Fractals 01, no. 02 (1993): 263–68. http://dx.doi.org/10.1142/s0218348x93000277.

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In the reflection seismic technique of hydrocarbon prospecting, the measured signal is the convolution of an unknown sequence of reflection coefficients by a statistically known source signature. A basic task of seismic processing is to estimate the sequence of reflection coefficients. The aim of this paper is to show that in case of a fractal sedimentation model, the conventional statistical descriptors (variance, skewness, kurtosis) of the reflection coefficient sequence are strongly dependent on, or are even divergent functions of, the resolution.

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Suh, Kyung-Duck, Yeul Woo Kim, and Chang-Hwan Ji. "CALCULATION OF PERMEABILITY PARAMETER OF PERFORATED WALL." Coastal Engineering Proceedings 1, no. 32 (2011): 19. http://dx.doi.org/10.9753/icce.v32.structures.19.

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The friction coefficient in the permeability parameter of a perforated wall has been estimated on the basis of a best fit between measured and predicted values of such hydrodynamic coefficients as reflection and transmission coefficients. In the present study, an empirical formula for the friction coefficient is proposed in terms of known variables, i.e., the porosity and thickness of the perforated wall and the water depth. This enables direct estimation of the friction coefficient without invoking a best fit procedure. To validate the proposed formula, the reflection and transmission coeffic

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