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Artykuły w czasopismach na temat „Reflector”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Liu, Weixu, Zhifeng Tang, Fuzai Lv, Yang Zheng, Pengfei Zhang, and Xiangxian Chen. "Numerical Investigation of Locating and Identifying Pipeline Reflectors Based on Guided-Wave Circumferential Scanning and Phase Characteristics." Applied Sciences 10, no. 5 (2020): 1799. http://dx.doi.org/10.3390/app10051799.

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The methodology based on reflected guided-wave by a reflector associated with an increase or a decrease in the cross-sectional area has the challenge of determining their location and identity. This paper presents a numerical investigation of a method for locating and identifying the reflector based on guided-wave circumferential scanning and phase characteristics. To determine the axial and circumferential positions of the reflector within the pipeline, the procedures of the guided wave-based circumferential scanning were presented, including data preprocessing, median filter, image smoothing

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2

Bube, Kenneth P., and Robert T. Langan. "Resolution of slowness and reflectors in crosswell tomography with transmission and reflection traveltimes." GEOPHYSICS 73, no. 5 (2008): VE321—VE335. http://dx.doi.org/10.1190/1.2969777.

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We sometimes encounter situations in seismic imaging in which knowing the position of key reflectors between wells would be very useful. In many crosswell data sets, both transmission and reflection traveltimes for selected reflectors can be picked. We investigated the possibility that transmission-plus-reflection crosswell traveltime tomography can determine the position of these reflectors with a high level of accuracy, thereby providing an independent way of verifying (and perhaps improving) the position of these reflectors obtained from crosswell reflection imaging. We studied the effect o

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3

Huang, Wei, Ningye He, Renxia Ning, and Zhenhai Chen. "Wideband Reflector and Analogue Electromagnetically Induced Reflection in Metamaterials." Crystals 11, no. 8 (2021): 985. http://dx.doi.org/10.3390/cryst11080985.

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Metamaterials are highly demanded for advanced applications in absorbers, sensors, and filters. However, metamaterial reflectors, especially broadband reflectors, remain challenging. In this paper, we theoretically investigate a wideband metamaterial reflector which consists of cross shaped graphene strips and a silica (SiO2) substrate. The cross shaped graphene strips are coated on the top of the structure, and the cross shape rotated 45° graphene strips are spun on the bottom of it. The calculated reflection can be tuned through length and width of the graphene strips. By comparison, not onl

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4

Kryuchkov, Igor V., Eduard O. Mozharov, and Anna I. Skachkova. "Special aspects of modulation RCS measurement in Ka-band." ITM Web of Conferences 30 (2019): 11012. http://dx.doi.org/10.1051/itmconf/20193011012.

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Radar reflectors are used as standards for radioelectronic devices calibration, as navigation beacons for air and naval traffic control and for radar visibility increase. Controlled (parametric) reflectors change reflected signal characteristics. This leads to appearance of easily detectable additional frequency components on modulation frequency. Ka-band parametric reflector design, consisting of horn reflector and phase switch 0°/180° board, is suggested. Technique of parametric reflector modulation RCS measurement, using complex envelope of reflected signal in every phase switch state, is s

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5

Parker, Andrew R., David R. Mckenzie, and Maryanne C. J. Large. "Multilayer reflectors in animals using green and gold beetles as contrasting examples." Journal of Experimental Biology 201, no. 9 (1998): 1307–13. http://dx.doi.org/10.1242/jeb.201.9.1307.

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The light reflectors in the beetles Calloodes grayanus and Anoplognathus parvulus are examined. Contrasting multilayer reflectors are revealed. Calloodes grayanus appears a weak green colour, matching its background leaves, while A. parvulus is strongly metallic-gold coloured. The former reflection is diffuse, as the result of a structure causing scattering that overlies the multilayer reflector, whereas the latter reflection is strongly directional. The green colour of C. grayanus is achieved by a multilayer reflector with a fixed spatial periodicity, here termed 'regular', which is far remov

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6

Knapp, R. W. "Fresnel zones in the light of broadband data." GEOPHYSICS 56, no. 3 (1991): 354–59. http://dx.doi.org/10.1190/1.1443049.

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The investigation of zero‐offset response to circular reflectors of increasing Fresnel zone size shows that reflection response is a constant and is independent of reflector size, except when the reflector diameter is so small that the diffractions interfere with the primary reflection. The extent of this effect is dependent upon vertical resolution and the time separation of the primary reflector and the diffraction. Interference occurs for reflectors smaller in diameter than the first Fresnel zone. Migration removes this interference. For broadband data the Fresnel zone solution breaks into

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7

Le, Hien-Thanh, Lanh-Thanh Le, Ming-Jui Chen, et al. "ECE/SAE Dual Functional SuperPin Plus Curved Reflex Reflector by Use of New Structured Corner Cubes." Applied Sciences 10, no. 2 (2020): 454. http://dx.doi.org/10.3390/app10020454.

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We propose and demonstrate, using optical experiments, a new reflex reflector structure called SuperPin Plus. The structure is composed of special pin groups with dihedral-angle offsets in corner cubes. One of the specular features brought by this new design is that it can comply with both the US SAE (US Society of Automotive Engineers) standard and the EU ECE (Economic Commission for Europe) standard, so that manufacturing costs of reflex reflector for both European and American automobile markets can be reduced. By using genetic algorithms for optimization, the angles and the positions of th

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8

Xiao, Dawei, Jingzhuo Zhang, Zichao Chu, and Yi Luo. "Research on the Acoustic Scattering Characteristics of Underwater Corner Reflector Linear Arrays." Sensors 25, no. 7 (2025): 2129. https://doi.org/10.3390/s25072129.

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This manuscript aims to optimize the acoustic scattering characteristics of underwater corner reflector linear arrays through simulation analysis and experimental validation, thereby enhancing their application efficiency in underwater acoustic countermeasures, particularly in terms of increasing acoustic echo intensity and reducing reflection blind spots. The acoustic scattering characteristics of submerged corner reflectors were meticulously simulated using the finite element method–boundary element method coupling technique, and the simulation results were rigorously verified through tank e

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9

TYGEL, MARTIN, JÖRG SCHLEICHER, LÚCIO T. SANTOS, and PETER HUBRAL. "THE KIRCHHOFF–HELMHOLTZ INTEGRAL PAIR." Journal of Computational Acoustics 09, no. 04 (2001): 1383–94. http://dx.doi.org/10.1142/s0218396x01001467.

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The Kirchhoff–Helmholtz integral models the reflected acoustic wavefield by an integration along the reflector over the incident field multiplied by the specular plane-wave reflection coefficient. Based on the structural relationships between the reflector and the reflection-traveltime surface, we design an asymptotic inverse Kirchhoff–Helmholtz integral. Analogously to the forward integral, the proposed inverse consists of an integration along the reflection-traveltime surface over the recorded reflected field. We show that the new inverse integral asymptotically recovers the input to the sta

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10

Ooshaksaraei, P., K. Sopian, R. Zulkifli, M. A. Alghoul, and Saleem H. Zaidi. "Characterization of a Bifacial Photovoltaic Panel Integrated with External Diffuse and Semimirror Type Reflectors." International Journal of Photoenergy 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/465837.

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Silicon wafer accounts for almost one-half the cost of a photovoltaic (PV) panel. A bifacial silicon solar cell is attractive due to its potential of enhancing power generation from the same silicon wafer in comparison with a conventional monofacial solar cell. The bifacial PV cell is able to capture solar radiation by back surface. This ability requires a suitable reflector appropriately oriented and separated from the cell’s rear surface. In order to optimize the bifacial solar cell performance with respect to an external back surface reflector, diffuse and semimirror reflectors were investi

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11

Domingos, Gonçalo, José Carlos Garcia Pereira, Pedro Alexandre Rodrigues Rosa, José Rodríguez, and Luís Guerra Rosa. "Experimental Validation of Double Paraboloid Reflection for Obtaining Quasi-Homogeneous Distribution of Concentrated Solar Flux." Energies 16, no. 9 (2023): 3927. http://dx.doi.org/10.3390/en16093927.

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This work demonstrates that the quasi-homogeneous distribution of concentrated solar flux is achievable by using double paraboloid reflection, with a primary reflector to concentrate the sunlight, and a secondary reflector to homogenise the radiation flux. For that, three slightly different secondary reflectors were designed and manufactured, matching the specifications of the paraboloid concentrator of the SF60 solar furnace located in PSA—Plataforma Solar de Almería, which was used as primary reflector. Starting from preliminary simulations of the optical apparatus, the secondary geometries

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12

MOHD YAZIZ, NUR SYAHIRAH, MOHAMAD KAMAL A. RAHIM, NOOR ASMAWATI SAMSURI, and FARID ZUBIR. "Comparison between Two Different Fractal Koch Position for Reflecting Intelligent Surface (RISs)." ELEKTRIKA- Journal of Electrical Engineering 23, no. 3 (2024): 67–72. https://doi.org/10.11113/elektrika.v23n3.592.

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The paper focuses on investigating the fractal shape placement of metasurface reflectors at the X-band frequency for Reflecting Intelligent Surface (RIS). The proposed reflector adopts a square shape, with the fractal intersection on a Rogers RO5880 substrate measuring 0.51 mm in thickness. The graph illustrating the S-parameter and reflection phase exhibits the simulated outcomes for various fractal positions. Furthermore, the bandwidth of the proposed reflector was determined by analyzing the simulation results. The impact of the incident wave angle on the proposed reflector was observed to

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13

Diaz, Y., P. Arévalo, L. Hernández-García, et al. "Constraining X-ray reflection in the low-luminosity AGN NGC 3718 using NuSTAR and XMM–Newton." Monthly Notices of the Royal Astronomical Society 496, no. 4 (2020): 5399–413. http://dx.doi.org/10.1093/mnras/staa1762.

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ABSTRACT One distinctive feature of low-luminosity active galactic nuclei (LLAGNs) is the relatively weak reflection features they may display in the X-ray spectrum, which can result from the disappearance of the torus with decreasing accretion rates. Some material, however, must surround the active nucleus, i.e. the accretion flow itself and, possibly, a flattened-out or thinned torus. In this work, we study whether reflection is indeed absent or undetectable due to its intrinsically weak features together with the low statistics inherent to LLAGNs. Here, we focus on NGC 3718 (L/LEdd ∼ 10−5)

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14

Schumann, Julian, Bert Schiebler, and Federico Giovannetti. "Performance Evaluation of an Evacuated Tube Collector with a Low-Cost Diffuse Reflector." Energies 14, no. 24 (2021): 8209. http://dx.doi.org/10.3390/en14248209.

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In order to increase the overall solar energy gain of evacuated tube collectors, rear-side reflectors are used. In this way, the otherwise unused incident radiation between the tubes can be reflected back to the absorber, and the performance of the collector can be improved. In this paper, the use of a low-cost, diffusely reflecting, trapezoidal roof covering made from a galvanized metal sheet is investigated and compared to a high-quality, specularly reflecting plane reflector made of aluminum. For this purpose, ray-tracing analysis and TRNSYS simulations were carried out. In the ray-tracing

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15

Favretto-Cristini, Nathalie, Paul Cristini, and Eric de Bazelaire. "What is a seismic reflector like?" GEOPHYSICS 74, no. 1 (2009): T13—T23. http://dx.doi.org/10.1190/1.3033216.

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The spatial region that is in the vicinity of an interface and actually affects the interface response, and hence the reflected wavefield, is of particular interest for the characterization of reflectors from a seismic viewpoint. This region is represented by a volume of integration of medium properties above and below the interface whose maximum lateral extent corresponds to the lateral extent of the interface Fresnel zone, and whose maximum vertical extent is equal to a thickness we evaluate approximately for subcritical incidence angles for a plane interface as well as for curved interfaces

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16

Tang, X. M., H. Glassman, and D. Patterson. "Single-well acoustic imaging in anisotropic formations." GEOPHYSICS 73, no. 4 (2008): D11—D16. http://dx.doi.org/10.1190/1.2907522.

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The effect of formation anisotropy on single-well acoustic imaging was analyzed to provide a simple and effective correction method for the imaging application. We used analytical and synthetic modeling to analyze acoustic reflection moveout in a transversely isotropic (TI) formation for borehole configuration. Far-borehole reflections from a bed generally have small reflection angles to the bed. Thus the reflection moveout away from the borehole is controlled largely by the velocity along the TI-symmetry axis. Consequently, reflection imaging using measured velocity along the borehole can cau

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17

Liang, Hong, Yi Luo, Panos G. Kelamis, and Arthur B. Weglein. "Reflector spectrum for relating seismic arrivals to reflectors." GEOPHYSICS 77, no. 6 (2012): T239—T246. http://dx.doi.org/10.1190/geo2012-0162.1.

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When interpreting seismic images or suppressing multiples in seismic data, it is important to identify the reflectors from which the multiples, especially the internal multiples, originated. We evaluated a method to relate all seismic arrivals, including primaries and multiples, to their originating reflectors. We used the reflectivity forward modeling method to isolate reflectors and determine the contribution of an individual reflector to arrivals in a seismic trace. Repeating this process for all reflectors produced a reflector spectrum, which shows quantitatively the relative contribution

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18

Taygin, V. B., and А. V. Lopatin. "Method of achievement the high accuracy of the shape of reflectors of mirror antennas of spacecraft." Spacecrafts & Technologies 3, no. 4 (2019): 200–208. http://dx.doi.org/10.26732/2618-7957-2019-4-200-208.

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Analysis of conditions, which are required for mirror antennas of spacecrafts destined for transmission of high-frequent radio signals, is done in this paper. These conditions are regarded to resistance and rigidity of the construction features of the material of an antenna’s reflector and its surface’s quality. It is mentioned that the requirements to the accuracy of the reflector’s shape grow together with the frequency of a radio signal. Altogether, the existing constructions of antennas and the producing technologies are not capable to obtain those requirements. The innovative method of co

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19

Gong, Hao, Hao Chen, Xiao He, and Xiuming Wang. "Eliminating the azimuth ambiguity in single-well imaging using 3C sonic data." GEOPHYSICS 80, no. 1 (2015): A13—A17. http://dx.doi.org/10.1190/geo2014-0337.1.

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The shortcomings of conventional single-well sonic imaging are the inefficiency in eliminating azimuth ambiguity of the reflector outside boreholes. To resolve this problem, we proposed that 3C data of the reflection echoes be migrated simultaneously. The quantitative expressions of the received 3C data were first derived. The direct correlations between the polarity of the 3C data and the reflector azimuth were analyzed. It was revealed that the reflector positions can be fully identified by the associated echoes consisting of the transverse and axial components of wavefields. And an improved

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20

Mohan, Manoj Kumar Chandra, Sang Kyun Shim, June Key Lee, Nakwon Jang, Naesung Lee, and Wael Z. Tawfik. "Optimized Aluminum Reflector for Enhancement of UVC Cathodoluminescence Based-AlGaN Materials with Carbon Nanotube Field Emitters." Molecules 26, no. 13 (2021): 4025. http://dx.doi.org/10.3390/molecules26134025.

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The far ultraviolet C (UVC) light sources based on carbon nanotube (CNT) field emitters as excitation sources have become promising light sources for sterilization, disinfection, and water purification. However, the low light extraction efficiency of UVC–CNT light sources still hinders the practical application of these structures. Herein, we report an optimized aluminum (Al) reflector to enhance the light extraction efficiency of UVC–CNT light sources. Optical analysis of UVC-CNT light sources covered by the Al reflectors with various thicknesses ranging from 30 to 150 nm was performed to rea

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21

Ha, Nguyen Thu, Trinh Van Thai, Thanh Long Cung, and Hoang Si Hong. "A calculation method of the passive wireless surface acoustic wave sensor response phase." Bulletin of Electrical Engineering and Informatics 12, no. 1 (2023): 86–97. http://dx.doi.org/10.11591/eei.v12i1.4068.

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In this research, we propose a method to calculate the phase delay angle of the reflected wave compared to the wave emitted from the interdigital transducer (IDT) of a passive wireless surface acoustic wave (SAW) sensor by combining simulation of the finite element method (FEM) and MATLAB. Based on the result, we consider the influence of the reflector position on the phase delay of the SAW sensor consisting of an IDT and three equally spaced reflectors. The distances between the IDT and the first reflector are 870 micrometers, 939.6 micrometers, and 1009.2 micrometers, and the distances betwe

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22

Tunalioglu, Nursu, and Cemali Altuntas. "An experimental test for detecting effective reflector height with GPS SNR data." Earth Sciences Research Journal 26, no. 1 (2022): 13–22. http://dx.doi.org/10.15446/esrj.v26n1.87003.

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This study aims to estimate effective reflector heights and height differences using the basic geometrical principle of multipath theory by controlling the signal quality for estimations. The geometry of the reflecting signal allows computing the effective reflector height, which is extracted from where the signal reflects on the ground and arrives at the GPS antenna phase center. To achieve that, an experimental case with two stations was conducted in the snow-free environment and GPS receivers were mounted on reflectors, which allowed to measure daily in-situ reflector heights and artificial

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23

Tambunga, Gabriel James. "The Doppler Factor and Quantum Electrodynamics Basics in Laser-Driven Light Sailing." International Letters of Chemistry, Physics and Astronomy 19 (October 2013): 10–14. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.19.10.

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Basic concepts in Quantum Electrodynamics (QED) and the doppler factor were applied to laser-driven light sailing, where this combination was not considered before. QED indicates that a reflection is an absorption and an emission of discreet energy, and the doppler factor indicates a change in velocity of a reflector would result in the reflector observing a change in wavelength from a source. Applying these concepts results in the reflectors available discrete energy states not being filled, after the reflector changes its velocity. Changes in the apparatus of the laser-driven light sail and

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Tambunga, Gabriel James. "The Doppler Factor and Quantum Electrodynamics Basics in Laser-Driven Light Sailing." International Letters of Chemistry, Physics and Astronomy 19 (October 2, 2013): 10–14. http://dx.doi.org/10.56431/p-3ui0ua.

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Basic concepts in Quantum Electrodynamics (QED) and the doppler factor were applied to laser-driven light sailing, where this combination was not considered before. QED indicates that a reflection is an absorption and an emission of discreet energy, and the doppler factor indicates a change in velocity of a reflector would result in the reflector observing a change in wavelength from a source. Applying these concepts results in the reflectors available discrete energy states not being filled, after the reflector changes its velocity. Changes in the apparatus of the laser-driven light sail and

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25

Borkar, V. G., R. Ethiraj, and V. M. Pandharipande. "Reflected fields from twist reflector in twist reflector scanning antenna configuration." Electronics Letters 29, no. 16 (1993): 1397. http://dx.doi.org/10.1049/el:19930936.

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Choi, Choi, Kim, Ryu, Rim, and Kim. "New Curved Reflectors for Significantly Enhanced Solar Power Generation in Four Seasons." Energies 12, no. 23 (2019): 4602. http://dx.doi.org/10.3390/en12234602.

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A new curved-type reflector for solar power generation is proposed. By adopting the curved-type reflector between consecutive solar panel arrays, all incoming sunlight can be utilized and thus, the generated power is significantly increased. Furthermore, the proposed curved-type reflector can be generally used in four seasons regardless of the altitude or angle of the installation environment. The optimum design rule for the curved-reflector, comparing to a plane-type reflector, is completely developed in this paper. A new solar cell configuration best fit for the proposed curved-reflector is

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27

Deng, H. Lydia. "Acoustic‐wave propagation in thin‐layered media with steep reflectors." GEOPHYSICS 59, no. 10 (1994): 1593–604. http://dx.doi.org/10.1190/1.1443548.

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Seismic waves reflected from steep interfaces beneath layered sediments spend a significant portion of time traveling almost horizontally. Therefore, accurate imaging of steep geologic structure requires knowledge of the behavior of these horizontally propagating waves; in particular, the role of evanescence and tunneling of seismic waves propagating in thin‐layered media. For thin‐layered media, modeling of zero‐offset reflections shows frequency‐dependent amplitude and phase behavior that varies with reflector dip. Waves propagating vertically in a sequence of thin layers lose high frequenci

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*, Isdawimah, Nuha Nadhiroh, Muchlishah *, Dezetty Monika, Arum Kusuma Wardhany, and Ajeng Bening Kusumaningtyas. "PEMANFAATAN REFLEKTOR UNTUK PENINGKATAN DAYA LUARAN PANEL SURYA." Jurnal Poli-Teknologi 21, no. 3 (2022): 97–106. http://dx.doi.org/10.32722/pt.v21i3.4723.

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The Government of Indonesia has committed to support the development of solar power plant, while the efficiency of solar panels still around 5-16%. There are several methods to increase the output power of solar panel, but mostly consume a big portion of energy from solar power plant. The objective is to identify an off-grid solar power plant optimization method with smaller power consumption. The proposed optimization method is to add a reflector that can be positioned to direct sunlight so that it always hits the solar panel, so that the solar panel is able to produce electrical power optima

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Wei, Zhou-Tuo, and Xiao-Ming Tang. "Numerical simulation of radiation, reflection, and reception of elastic waves from a borehole dipole source." GEOPHYSICS 77, no. 6 (2012): D253—D261. http://dx.doi.org/10.1190/geo2012-0061.1.

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A recent advance in single-well reflection imaging is the use of a dipole acoustic system in a borehole to radiate and receive elastic waves to and from a remote geologic reflector in formation. This dipole-acoustic imaging technology is evaluated by numerically simulating the radiation and reflection of the wavefield generated by the borehole dipole source and analyzing the receiving sensitivity of the dipole system to the incoming reflected waves. The analyses show that a borehole dipole source can radiate a compressional wave (P-wave) and two types of shear waves (i.e., SV- and SH-waves) in

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Hirabayashi, Nobuyasu. "Reflector imaging using trial reflector and crosscorrelation: Application to fracture imaging for sonic data." GEOPHYSICS 81, no. 6 (2016): S433—S446. http://dx.doi.org/10.1190/geo2016-0046.1.

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I have developed two high-resolution imaging methods that do not require a priori information on the structural dip. The dip information is often necessary to image complex structures using Kirchhoff migration by selecting only the constructively interfering parts of waveforms, especially for data with limited acquisition geometry. However, such dip information is not generally available. The methods that I evaluated use a trial reflector, which is defined for each image point and source-receiver pair, to search for the true geologic reflector. The coincidence of these reflectors is judged by

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Lu, Chun-Hao, Jiun-Hung Lin, Han-Ming Huang, Cheng-Yang Huang, and Cheng-Chi Tai. "DESIGN OF A RING-TYPE REFLECTION PULSE OXIMETER WITH A PARABOLIC REFLECTOR." Biomedical Engineering: Applications, Basis and Communications 27, no. 01 (2015): 1550007. http://dx.doi.org/10.4015/s1016237215500076.

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A pulse oximeter is a noninvasive instrument used in clinical medicine to monitor arterial oxygen saturation. Fingertip-type pulse oximeters are popular, but their inconvenience for long-term monitoring in daily life means that other types of wearable pulse oximeters, such as a ring-type reflection pulse oximeter, needs to be developed. However, designing a ring-type pulse oximeter for measuring the oxygen saturation is difficult due to the complex tissue architecture of the finger base. This study used human tissue simulations to evaluate the practicability of a ring-type reflection pulse oxi

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Lobanov, Ye, and G. Petchenko. "The technique of calculating the profile of a mirror reflector for discharge lamps of cylindrical shape and its testing on the example of design of an industrial lamp type ZhSP-250." Lighting engineering and power engineering 1, no. 57 (2020): 22–27. http://dx.doi.org/10.33042/2079-424x-2020-1-57-22-27.

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Current scientific trends are developments - methodological, theoretical and experimental, related to increasing the efficiency of some categories of lamps with discharge lamps. One such category is the powerful industrial spotlight class luminaires. This work is aimed at solving the urgent scientific task of finding ways to improve the design efficiency of industrial luminaires with deep and concentrated light distribution. At present, there are practically no works related to the task of calculating the geometry of the profiles of mirrored round-symmetric reflectors, which, in the presence o

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Arabacigil, Bihter, Numan Yuksel, and Atakan Avci. "The use of paraffin wax in a new solar cooker with inner and outer reflectors." Thermal Science 19, no. 5 (2015): 1663–71. http://dx.doi.org/10.2298/tsci121022031a.

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In this paper, the potential use and effectiveness of paraffin wax in a new solar cooker was experimentally investigated during daylight and late evening hours. For these experiments, a cooker having an inner reflecting surface was designed, constructed by filling paraffin wax and metal shavings. The side- and sub-surface temperatures of the paraffin wax in the cooker are measured in the summer months of June and July. The thermal efficiency of the cooker was tested on different conditions. The results show that the optimum angle of the outer reflector is 30?. Here, the peak temperature of the

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Lin, Yueheng. "Design and Applications of a Continuously Tunable Bragg Reflector for the Visible Spectrum." Applied and Computational Engineering 128, no. 1 (2025): 183–88. https://doi.org/10.54254/2755-2721/2025.20457.

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Bragg reflectors have become fundamental in optical technologies, providing wavelength-specific reflection in fields like telecommunications and photonic devices. Based on the visible band as well as its application, this paper describes the concept and possible implementation of a frequency-tunable Bragg reflector. Applying the method of alternating the thin film of Titanium dioxide (TiO) and silicon oxide (SiO) with a soft PDMS substrate and a liquid crystal layer, the system allows for direct tuning of the reflected wavelengths. A dual-tuning mechanism, combining an electric field and mecha

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Titovich, Alexey, and Alex Titovich. "Macriaphone: A Stargazer’s microphone design." Journal of the Acoustical Society of America 151, no. 4 (2022): A248. http://dx.doi.org/10.1121/10.0011215.

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A highly directional, single channel microphone design is presented. The design utilizes a line of sight waveguide similar to a Keplerian reflector-type telescope. The key feature is that the waveguide is acoustically reflection-less thereby preventing off-axis reflected and diffracted fields from contaminating the measurement. The signal in the desired direction is amplified by a parabolic reflector, which terminates the waveguide and supports a single microphone at its focal point. The resulting directivity index is superior to that of a parabolic reflector microphone. Due to the line-of-sig

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Schleicher, Jörg, Peter Hubral, German Höcht, and Frank Liptow. "Seismic constant‐velocity remigration." GEOPHYSICS 62, no. 2 (1997): 589–97. http://dx.doi.org/10.1190/1.1444168.

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When a seismic common midpoint (CMP) stack or zero‐offset (ZO) section is depth or time migrated with different (constant) migration velocities, different reflector images of the subsurface are obtained. If the migration velocity is changed continuously, the (kinematically) migrated image of a single point on the reflector, constructed for one particular seismic ZO reflection signal, moves along a circle at depth, which we call the Thales circle. It degenerates to a vertical line for a nondipping event. For all other dips, the dislocation as a function of migration velocity depends on the refl

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Yuan, Sichen. "Review of Root-Mean-Square Error Calculation Methods for Large Deployable Mesh Reflectors." International Journal of Aerospace Engineering 2022 (August 4, 2022): 1–18. http://dx.doi.org/10.1155/2022/5352146.

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In the design of a large deployable mesh reflector, high surface accuracy is one of ultimate goals since it directly determines overall performance of the reflector. Therefore, evaluation of surface accuracy is needed in many cases of design and analysis of large deployable mesh reflectors. The surface accuracy is usually specified as root-mean-square error, which measures deviation of a mesh geometry from a desired working surface. In this paper, methods of root-mean-square error calculation for large deployable mesh reflectors are reviewed. Concept of reflector gain, which describes reflecto

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Fan, Jing Hui, Hong Li Zhao, and Yi Wang. "Design, Deploy and Signal Analysis of Different Types of CR." Applied Mechanics and Materials 239-240 (December 2012): 1238–41. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.1238.

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In Shuping area, it is difficulty to find enough nature coherent targets to use InSAR technique to monitor the landslide. In order to solve the problem, CRs(Corner Reflectors) were used to improve the effectiveness of this technology. In this article Pyramidal Corner Reflector, Asymmetric Cubic Corner Reflector, Double Direction Asymmetric Cubic Corner Reflector are designed. In order to achieve maximum reflection intensity of CR, it's attitude must be carefully adjusted to match with the SAR imaging parameters exactly. After the CRs were deployed, the strong echo signals can be retrieved from

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Kim, Dong-Geon, Hyun-Guk Kim, Dong-Yeon Kim, Ryoon-Ho Do, Kyung-Rae Koo, and Young-Joon Yu. "Development of a Deployable Reflector Antenna for the Synthetic Aperture Radar Satellite, Part 2: Manufacturing and Qualification of the Main Reflector Using a Honeycomb Sandwich Composite Structure." Applied Sciences 14, no. 23 (2024): 11273. https://doi.org/10.3390/app142311273.

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A deployable reflector antenna (DR-A) is a structure that can be stored in a large-diameter Synthetic Aperture Radar (SAR) antenna and be mounted onto a launch vehicle. Considering the performance of the launch vehicle, it is necessary to develop a lightweight, high-performance antenna structure. The solid-type deployable reflector antenna is composed of a number of unit main reflectors. To reduce the weight of the antenna, a lightweight main reflector must be developed. In this paper, following “Development of Deployable Reflector Antenna for the SAR Satellite (Part 1)”, the manufacturing and

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Suryo, Taufik Hadi, Damora Rhakasywi, and Fahrudin Fahrudin. "The Effect of Solar Panel Output Power Analysis with Reflector Angle Optimization and Addition of Heatsink-Fan Cooling System." Journal of Applied Science, Engineering, Technology, and Education 5, no. 1 (2023): 93–122. http://dx.doi.org/10.35877/454ri.asci1535.

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The addition of reflectors to solar panels is used to increase the intensity of sunlight received by solar panels so that the electrical power generated by the panels increases. In adding reflectors to solar panels, they must consider various factors to be able to increase the power generated without having a negative effect on solar panels , one of which is providing a cooling system. Therefore, research is needed to increase the power generated by solar panels and cooling systems that are suitable for overcoming rising temperatures due to the addition of reflectors. The study was conducted b

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Bezuglyi, M. A., N. V. Bezuglaya, A. V. Ventsuryk, and K. P. Vonsevych. "Angular Photometry of Biological Tissue by Ellipsoidal Reflector Method." Devices and Methods of Measurements 10, no. 2 (2019): 160–68. http://dx.doi.org/10.21122/2220-9506-2019-10-2-160-168.

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Angular measurements in optics of biological tissues are used for different applied spectroscopic task for roughness surface control, define of refractive index and for research of optical properties. Purpose of the research is investigation of the reflectance of biologic tissues by the ellipsoidal reflector method under the variable angle of the incident radiation.The research investigates functional features of improved photometry method by ellipsoidal reflectors. The photometric setup with mirror ellipsoid of revolution in reflected light was developed. Theoretical foundations of the design

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Sakai, Daisuke, Jun Nishikawa, Hiroshi Kakiuchida, and Euichi Hirose. "Stack of cellular lamellae forms a silvered cortex to conceal the opaque organ in a transparent gastropod in epipelagic habitat." PeerJ 10 (October 28, 2022): e14284. http://dx.doi.org/10.7717/peerj.14284.

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Background Gelatinous zooplankton in epipelagic environments often have highly transparent bodies to avoid detection by their visual predators and prey; however, the digestive systems are often exceptionally opaque even in these organisms. In a holoplanktonic gastropod, Pterotrachea coronata, the visceral nucleus is an opaque organ located at the posterior end of its alimentary system, but this organ has a mirrored surface to conceal its internal opaque tissue. Results Our ultrastructural observation proved that the cortex of the visceral nucleus comprised a stack of thin cellular lamellae for

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Ayzenberg, Milana, Ilya Tsvankin, Arkady Aizenberg, and Bjørn Ursin. "Effective reflection coefficients for curved interfaces in transversely isotropic media." GEOPHYSICS 74, no. 5 (2009): WB33—WB53. http://dx.doi.org/10.1190/1.3197862.

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Plane-wave reflection coefficients (PWRCs) are routinely used in amplitude-variation-with-offset analysis and for generating boundary data in Kirchhoff modeling. However, the geometrical-seismics approximation based on PWRCs becomes inadequate in describing reflected wavefields at near- and postcritical incidence angles. Also, PWRCs are derived for plane interfaces and break down in the presence of significant reflector curvature. Here, we discuss effective reflection coefficients (ERCs) designed to overcome the limitations of PWRCs for multicomponent data from heterogeneous anisotropic media.

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Poluektov, Serhii, Natalia Bezugla, Kinga Kurowska-Wilczyńska, and Mikhail Bezuglyi. "INFORMATION SYSTEM FOR MULTI-VECTOR RAYTRACING IN ELLIPSOIDAL REFLECTORS." Bulletin of Kyiv Polytechnic Institute. Series Instrument Making, no. 65(1) (June 30, 2023): 19–28. http://dx.doi.org/10.20535/1970.65(1).2023.283215.

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Due to two focuses, ellipsoidal reflectors are unique reflective optical elements that allow conjugate imaging in two focal planes within their inner cavity. Such reflectors are used in various devices, such as lens telescopes, to achieve high resolution. They have found applications in microscope optical systems to increase the depth of field. They are used in scientific instruments, such as laser systems, to ensure the laser beam's high accuracy and stability. Despite their advantages, the non-spherical shape of ellipsoidal reflectors also introduces drawbacks in the form of errors arising f

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Kostenko, Stanislav, Natalia Fedak, and Olga Mayak. "SIMULATION OF THE RADIANT HEAT TRANSFER PROCESS IN THE ELEMENTS OF ROASTING EQUIPMENT." ScienceRise, no. 5 (November 11, 2020): 80–88. http://dx.doi.org/10.21303/2313-8416.2020.001474.

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The object of the research is the process of radiation heat transfer, taking into account a single reflection of rays in the IR device of food production. Investigated problem – the work is devoted to solving the problem of irregularity of radiation heat transfer during infrared roasting of food products. Main scientific results. The inverse problem of heat transfer by radiation has been solved and a technique has been developed for determining the profiles of the ray flux reflectors for uniform irradiation of receivers of a convex section. Analytical modeling of all-round uniform

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Saki, Morvarid, Christine Thomas, and Rafael Abreu. "Detection and modelling of strong topography of mid-mantle structures beneath the North Atlantic." Geophysical Journal International 229, no. 1 (2021): 219–34. http://dx.doi.org/10.1093/gji/ggab465.

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SUMMARY There is mounting evidence for the presence of seismic reflectors in the mantle at a depth of around 1000 km, however, the cause for these reflectors is not yet well established and published observations show a range of depth estimates for these structures. Discussion is also still ongoing whether it is one global or several different reflectors. Here, we investigate the presence of seismic reflectors beneath the North Atlantic using a large number of PP and SS underside reflections. We analyse over 2600 earthquakes with Mw ≥ 5.7 and use array seismic methods to improve the visibility

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Soni, V., A. Hadjadj, A. Chaudhuri, and G. Ben-Dor. "Shock-wave reflections over double-concave cylindrical reflectors." Journal of Fluid Mechanics 813 (January 17, 2017): 70–84. http://dx.doi.org/10.1017/jfm.2016.825.

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Numerical simulations were conducted to understand the different wave configurations associated with the shock-wave reflections over double-concave cylindrical surfaces. The reflectors were generated computationally by changing different geometrical parameters, such as the radii of curvature and the initial wedge angles. The incident-shock-wave Mach number was varied such as to cover subsonic, transonic and supersonic regimes of the flows induced by the incident shock. The study revealed a number of interesting wave features starting from the early stage of the shock interaction and transition

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Köhler, K., and M. Koenig. "Reconstruction of reflecting structures from vertical seismic profiles with a moving source." GEOPHYSICS 51, no. 10 (1986): 1923–38. http://dx.doi.org/10.1190/1.1442049.

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When a vertical seismic profile (VSP) is recorded, the illuminated part of a reflector depends upon the shape and position of the reflector itself as well as on the seismic velocities and the positions of sources and receivers. A preferable arrangement for the investigation of structures of reflectors is to fix the receiver(s) at constant depth(s) in the well and move the source horizontally along a line at the Earth’s surface, usually called a “multioffset VSP” (MSP) or “walkaway VSP.” As a test of the resolution power of this survey geometry, synthetic records were generated from a subsurfac

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Kukhtar, Denys, Volodymyr Hlotov, and Oleksandr Zayats. "GEODESY, CARTOGRAPHY, AND AERIAL PHOTOGRAPHY." GEODESY, CARTOGRAPHY, AND AERIAL PHOTOGRAPHY 98,2023, no. 98 (2023): 42–49. http://dx.doi.org/10.23939/istcgcap2023.98.042.

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This work aims to analyze the effectiveness of corner reflectors deployment designed in various for InSAR monitoring by the Sentinel-1 satellite. Method. The accuracy of determining the spatial movements of the surface by the InSAR method in the places where the corner reflectors are deployed depends on their size, as well as the signal-to-clutter ratio on the radar images. Therefore, it is necessary to assess the backscattering intensity on radar images for the selected territory before installing the corner reflector. In places where corner reflectors are to be deployed, an increase in backs

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Wenas, Donny R. "ANALISIS PANDU GELOMBANG MENGGUNAKAN BRAGG RELECTOR SEBAGAI CLADDING." Jurnal FisTa : Fisika dan Terapannya 1, no. 1 (2020): 6–11. http://dx.doi.org/10.53682/fista.v1i1.56.

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This study aims to examine the mode that can pass through the waveguide and calculate the filling factor and efficiency of the Bragg Reflector. For that purpose in this research, a program using Matlab has been created to analyze the propagation data of the waves in the material, cylindrical waveguides, and Bragg reflectors. From the results of this study, it has been found that a cylindrical perforated waveguide with a Bragg Reflector as a cladding, is one way to overcome the chromic dispersion of optical fiber materials. This is because the electromagnetic waves traveling through the a

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