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Готові списки джерел за темами / Polarization parameters / Статті в журналах

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Статті в журналах з теми "Polarization parameters"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 липня 2025

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1

Nalimov, A. G., V. V. Kotlyar, A. A. Kovalev, S. D. Poletaev, and Y. V. Khanenko. "Detection of elliptical polarization parameters using a metalens." Computer Optics 49, no. 2 (2025): 180–86. https://doi.org/10.18287/2412-6179-co-1515.

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A metalens capable of detecting the polarization ellipticity of an incident beam is considered in this paper. This metalens consists of blocks with diffraction gratings of a 140-nm height and a 220-nm period. The metalens operates as a polarizer, which depends on one transverse coordinate, and a focuser. It is capable of both separating linearly polarized radiation into two focal spots with the opposite-handed circular polarizations and detecting the circular polarization handedness and degree of its ellipticity. Operating in a wide range of wavelengths from 0.55 to 0.837 µm, the metalens can

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2

Liu, Chao, Shuai Xiang, Liangfeng Xu, and Zhengfei Fang. "Polarization and DOA Estimation Based on Dual-Polarized Conformal Array." International Journal of Antennas and Propagation 2019 (September 18, 2019): 1–9. http://dx.doi.org/10.1155/2019/8907685.

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A dual-polarized multiple signal classification (DP-MUSIC) algorithm is presented to estimate the arrival directions and polarizations for a dual-polarized conformal array. Each polarization signal is decomposed into two orthogonal polarization components, which are considered to be a pair of coherent signals coming from the same direction but different polarization. The polarization parameters are modeled as the equivalent coherence coefficients of the orthogonal polarization components. Then, the method of decoherence can be used to decouple the information of polarization states and signal

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3

Domański, J., J. Badziak, and S. Jabłoński. "Generation of proton beams from two-species targets irradiated by a femtosecond laser pulse of ultra-relativistic intensity." Laser and Particle Beams 35, no. 2 (2017): 286–93. http://dx.doi.org/10.1017/s0263034617000209.

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AbstractThe paper presents results of two-dimensional particle-in-cell simulations of ion beam acceleration at the interactions of a 130-fs laser pulse of intensity in the range 1021–1023 W/cm2, predicted for the Extreme Light Infrastructure lasers, with thin hydrocarbon (CH) or erbium hydride (ErH3) targets. A special attention is paid to the effect of the laser pulse intensity and polarization (linear, circular) on the proton energy spectrum, the proton beam spatial distribution and the proton pulse shape and intensity. It is shown that for the low laser intensities (~1021 W/cm2) considerabl

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4

Liu, Hao, James Creswell, Chao-Wei Tsai, and Pavel Naselsky. "The polarization quaternion and its applications: a joint representation of the Q/U Stokes parameters and E/B mode polarizations." Journal of Cosmology and Astroparticle Physics 2023, no. 11 (2023): 025. http://dx.doi.org/10.1088/1475-7516/2023/11/025.

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Abstract In this work, we point out that the Q/U Stokes parameters and E/B mode polarizations are the four components of a unique quaternion, which describes at the same time the directions and the parity states of spherical linear polarizations. We then point out that, with this polarization quaternion, the mathematical form of all Q/U and E/B transforms are greatly simplified, to an extent that requires only one quaternion multiplication for each transform. A preliminary application of the polarization quaternion is shown as an example to detect peculiar pixel domain patterns within the E- a

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5

Korban, D. "SIX-COMPONENT POLARIZATION SEPARATOR OF AN ALL-POLARIZED ANTENNA WITH ELECTROMAGNETIC WAVE POLARIZATION CONTROL ON RADIATION." Shipping & Navigation 33, no. 1 (2022): 67–78. http://dx.doi.org/10.31653/2306-5761.33.2022.67-78.

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The ship's radar system, along with the satellite navigation system of GPS or GLONASS type, is a means of ensuring the safety of navigation, as the information received with its help about the navigational situation along the ship's route is completely independent of external, in relation to the ship, equipment. However, during the reception of radar information on a navigational object, there is an atmospheric environment with hazardous phenomena (heavy rainfall) on the way of propagation of electromagnetic waves carrying this information. This creates along with a navigational object an echo

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6

Tereshchenko, E. D., R. Y. Yurik, and L. Baddeley. "Stimulated electromagnetic emission polarization under different polarizations of pump waves." Annales Geophysicae 33, no. 3 (2015): 295–300. http://dx.doi.org/10.5194/angeo-33-295-2015.

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Abstract. The results of investigations into the stimulated electromagnetic emission (SEE) polarization under different modes of the pump wave polarization are presented. The present results were obtained in November 2012 during a heating campaign utilizing the SPEAR (Space Plasma Exploration by Active Radar) heating facility, transmitting in both O- and X-mode polarization, and a PGI (Polar Geophysical Institute) radio interferometer capable of recording the polarization of the received radiation. The polarization ellipse parameters of the SEE DM (downshifted maximum) components were determin

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7

D., Prasad G. S. Jha, P. Choudhary B., and Sanyal S. "Corrosion inhibition of mild steel in aqueous binary solution of ag~ressive ions." Journal of Indian Chemical Society Vol.79, Mar 2002 (2002): 264–66. https://doi.org/10.5281/zenodo.5849237.

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Department of Post Graduate Studies in Chemistry, Sahibganj College, Sahibganj-8 16 109, India <em>Manuscript received 31 January 2001, revised 16 July 2001, accepted 22 August 2001</em> The effectiveness of sodium benzoate as corrosion inhibitor for mild steel in aqueous binary solution of sodium chloride and sodium sulfate has been studied. The inhibitor appears to function through adsorption following Langmuir adsorption isotherm. The thermodynamic parameters have been calculated. Polarization studies show that benzoate is an anodic inhibitor. Higher polarization of the anodes at low curren

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8

Rudnick, Lawrence, Debora Katz, and Lerato Sebokolodi. "Polarization Tomography with Stokes Parameters." Galaxies 9, no. 4 (2021): 92. http://dx.doi.org/10.3390/galaxies9040092.

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We present a simple but powerful technique for the analysis of polarized emission from radio galaxies and other objects. It is based on the fact that images of Stokes parameters often contain considerably more information than is available in polarized intensity and angle maps. In general, however, the orientation of the Stokes parameters will not be matched to the position angles of structures in the source. Polarization tomography, the technique presented in this paper, consists of making a series of single linear Stokes parameter images, S(ρ), where each image is rotated by an angle ρ from

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9

Carozzi, T., R. Karlsson, and J. Bergman. "Parameters characterizing electromagnetic wave polarization." Physical Review E 61, no. 2 (2000): 2024–28. http://dx.doi.org/10.1103/physreve.61.2024.

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10

Schaefer, Beth, Edward Collett, Robert Smyth, Daniel Barrett, and Beth Fraher. "Measuring the Stokes polarization parameters." American Journal of Physics 75, no. 2 (2007): 163–68. http://dx.doi.org/10.1119/1.2386162.

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11

Wolff, L. B., and D. J. Kurlander. "Ray tracing with polarization parameters." IEEE Computer Graphics and Applications 10, no. 6 (1990): 44–55. http://dx.doi.org/10.1109/38.62695.

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12

Bernard, Pascal, and Aldo Zollo. "Inversion of near-source S polarization for parameters of double-couple point sources." Bulletin of the Seismological Society of America 79, no. 6 (1989): 1779–809. http://dx.doi.org/10.1785/bssa0790061779.

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Abstract We propose an inversion method for retrieving the focal parameters of small to moderate earthquakes by using the near-source S-wave polarizations, which are expected to be less sensitive than amplitude data to source details or propagation effects. We first studied the variability of the polarization vector for complete synthetic records generated in simple media with a shallow low-velocity layer, for various distances (0 to 50 km), source depths (1 to 15 km), and mechanisms. In the frequency band 1 to 2 Hz, a polarization fluctuation of less than 20° is found for sources deeper than

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13

ŞIRVANLI, B. B. "DOUBLE-LEPTON POLARIZATION ASYMMETRIES IN B → K1l+l- DECAY IN UNIVERSAL EXTRA DIMENSION." International Journal of Modern Physics A 27, no. 08 (2012): 1250036. http://dx.doi.org/10.1142/s0217751x12500364.

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The double-lepton polarization asymmetries for the exclusive B → K1l+l- transition is studied in the universal extra dimension. It is shown that most of the double-lepton polarization asymmetries are sensitive to the model parameters. Any experimental measurements on double-lepton polarizations and their comparison with theoretical results can give valuable information on the physics beyond the standard model.

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14

Qiang Fan, Zhu Jing-Ping, Zhang Yun-Yao, et al. "Reconstruction of polarization parameters in channel modulated polarization imaging system." Acta Physica Sinica 65, no. 13 (2016): 130202. http://dx.doi.org/10.7498/aps.65.130202.

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15

Adnan, Septian Rahmat, Muhammad Hikam, and Edward Rizky. "Crystallographic and Electrical Properties of Barium Zirconium Titanate Doped by Indium and Lanthanum." Advanced Materials Research 896 (February 2014): 347–50. http://dx.doi.org/10.4028/www.scientific.net/amr.896.347.

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Barium Zirconium Titanate (BZT) films doped by Indium and Lanthanum were prepared using Chemical Solution Deposition followed by spin coating method. After deposition, the spesimen was annealed at 800 °C for 3 hours, using 3000 rpm angular spin coating speed. From crystallographic examination we found that the system is perovskite tetragonal with lattice parameters of a = 3.967 Ǻ, c = 3.988 Ǻ. On adding Indium and Lanthanum dopants, their lattice parameters have slightly increased. The spontaneous polarization of BZT is 23.13 µC/cm2, and their spontaneous polarizations increase on adding La do

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16

Dai, Pengzhang, Dong Yao, Tianxiang Ma, Honghai Shen, Weiguo Wang, and Qingyu Wang. "Analysis of Polarization Detector Performance Parameters on Polarization 3D Imaging Accuracy." Sensors 23, no. 11 (2023): 5129. http://dx.doi.org/10.3390/s23115129.

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Three-dimensional (3D) reconstruction of objects using the polarization properties of diffuse light on the object surface has become a crucial technique. Due to the unique mapping relation between the degree of polarization of diffuse light and the zenith angle of the surface normal vector, polarization 3D reconstruction based on diffuse reflection theoretically has high accuracy. However, in practice, the accuracy of polarization 3D reconstruction is limited by the performance parameters of the polarization detector. Improper selection of performance parameters can result in large errors in t

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17

Saito, T., T. Sutani, K. Kiyono, and T. Oikawa. "Polarization Characterization of LEDs by Stokes Parameters Measurements." Journal of Physics: Conference Series 2149, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2149/1/012009.

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Abstract Stokes parameters have been measured by using a polarimeter consisting of a rotating phase plate before a fixed polarizer for bullet-shaped red, green and blue LEDs at 3 different directions of 0°, 45° and 90° from the principal axis. The degree of polarization is minimum at the observation angle 0° (observed head-on) for all colors as expected but has non-zero values (1-9%). As for the possible cause for the partial polarization, it is likely to be brought by striae inside the transparent epoxy resin that can be easily visible. Data at observation angle 90° have features common for a

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18

Wen, Zhang Bin, Mi Zhou, Zhe Chen, and Yun Han Luo. "Design and Application of an In-Line Measurement System for Polarization Parameters." Applied Mechanics and Materials 321-324 (June 2013): 447–52. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.447.

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An in-line all-fiber measurement system for polarization parameters is designed and fabricated in this paper. This system implements accurate control of polarization state, together with in-line, accurate, and high-speed measurement of Stokes vector. It can measure the light polarization parameters such as States of Polarization (SOP), Degree of Polarization (DOP), Light Polarization Extinction Ratio (LPER), and related losses of polarization. Besides, polarization monitoring and stabilizing can be achieved using this system. Because there is no discrete device concluded, the optical path of t

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19

Hagen, Nathan. "Statistics of normalized Stokes polarization parameters." Applied Optics 57, no. 19 (2018): 5356. http://dx.doi.org/10.1364/ao.57.005356.

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20

Labendz, Daniel. "Investigation of Schumann resonance polarization parameters." Journal of Atmospheric and Solar-Terrestrial Physics 60, no. 18 (1998): 1779–89. http://dx.doi.org/10.1016/s1364-6826(98)00152-7.

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21

Walden, A. T., and T. Medkour. "Ensemble estimation of polarization ellipse parameters." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 463, no. 2088 (2007): 3375–94. http://dx.doi.org/10.1098/rspa.2007.0072.

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An ellipse describes the polarized part of a partially polarized quasi-monochromatic plane wave field. Its azimuth angle and aspect ratio are functions of the elements of the covariance matrix associated with the polarized part at a particular time instant. Given an ensemble of K independent samples at that time, the distributions of the estimators of these parameters are derived. The estimation is thus based on a sample ensemble at any time, and does not assume temporal stationarity. Additionally, the azimuth angle estimator has an angular distribution so that non-standard statistical methods

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22

Jiang, Yannan, Mianji Li, Jiao Wang, Xialin Huang, and Shitian Zhang. "A Metamaterial-Based Cross-Polarization Converter Characterized by Wideband and High Efficiency." Crystals 13, no. 1 (2022): 17. http://dx.doi.org/10.3390/cryst13010017.

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Metamaterial-based polarization converters, which have all kinds of polarizations realizable via adjusting metamaterial parameters, have been springing up at an increasing rate. However, the reported metamaterial-based polarization converters suffer from either limited bandwidth or low polarization conversion ratios. In this study, a metamaterial-based polarization converter consisting of multilayer copper split-ring resonators and a copper ground separated by dielectrics was demonstrated and was characterized by the cross-polarization with wideband and high-efficiency. For normal incidence, t

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23

Asgharzadeh, Mehdi, Andrej Bóna, Roman Pevzner, Milovan Urosevic, and Boris Gurevich. "Reliability of the slowness and slowness-polarization methods for anisotropy estimation in VTI media from 3C walkaway VSP data." GEOPHYSICS 78, no. 5 (2013): WC93—WC102. http://dx.doi.org/10.1190/geo2012-0409.1.

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We studied the validity of qP-wave slowness and slowness-polarization methods for estimating local anisotropy parameters in transversely isotropic (TI) media by quantifying the estimation errors in a numerical exercise. We generated numerical slownesses and polarizations over two aperture ranges corresponding to a short offset walkaway vertical seismic profiling (VSP) and a long offset walkaway VSP for a range of TI models with vertical axis of symmetry (VTI). Synthetic data are equisampled over the phase angle range and contaminated with Gaussian noise. We inverted the data and compared the a

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24

Shrestha, Chiranjibi, Saddam Husain Dhobi, and Narayan Babu Shrestha. "Strong-field nondipole approximation in laser-assisted thermal electron scattering." Insight - Physics 7, no. 1 (2024): 641. http://dx.doi.org/10.18282/ip641.

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This study investigates the differential cross-section (DCS) of electrons scattered by a hydrogen molecule (H₂) under varying conditions, including temperature, momentum, laser intensity, and polarization. The objective was to understand how these parameters affect electron scattering and to compare the effects of linear and circular polarizations. Methodologically, theoretical model was developed using strong-field nondipole approximation with linear and circular polarized laser fields, examining DCS as a function of thermal electron temperature, momentum, and laser intensity. The study utili

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25

Hand, Matthew, Hongchang Wang, Francesco Maccherozzi, et al. "Quantitative investigation of linear arbitrary polarization in an APPLE-II undulator." Journal of Synchrotron Radiation 25, no. 2 (2018): 378–84. http://dx.doi.org/10.1107/s1600577518001960.

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Insertion devices are utilized at synchrotron radiation facilities around the world for their capability to provide a high-brilliance X-ray beam. APPLE-II type undulators are especially important for their capacity to switch between a variety of photon beam polarization states. A high-precision soft X-ray polarimeter has been used to investigate the polarization calibration of an APPLE-II undulator (period length λu= 64 mm) installed on beamline I06 at Diamond Light Source. Systematic measurement of the beam polarization state at a range of linear arbitrary angles has been compared with the ex

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26

Luo, Weixuan, Bin Zhang, Anping Xiao, et al. "All-Solid Single-Polarization Anti-Resonant Fiber Base on Anisotropic Glass." Photonics 10, no. 4 (2023): 412. http://dx.doi.org/10.3390/photonics10040412.

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A single-polarization solid-core anti-resonant fiber is proposed, and the influence of the fiber core material anisotropy of the solid-core anti-resonant fiber on polarization characteristics is investigated using the finite element method. Single-polarization guidance is achieved by using the anisotropy of optical fiber materials, which also ensures high birefringence. The numerical simulation results indicate that there are two single-polarization intervals (1210–1440 nm and 1490–1560 nm), with a maximum bandwidth of up to 230 nm, when the confinement loss difference between the two orthogon

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27

Cammarata, Simone, Andrea Fontana, Ali Emre Kaplan, et al. "Polarization Control in Integrated Graphene-Silicon Quantum Photonics Waveguides." Materials 15, no. 24 (2022): 8739. http://dx.doi.org/10.3390/ma15248739.

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We numerically investigated the use of graphene nanoribbons placed on top of silicon-on-insulator (SOI) strip waveguides for light polarization control in silicon photonic-integrated waveguides. We found that two factors mainly affected the polarization control: the graphene chemical potential and the geometrical parameters of the waveguide, such as the waveguide and nanoribbon widths and distance. We show that the graphene chemical potential influences both TE and TM polarizations almost in the same way, while the waveguide width tapering enables both TE-pass and TM-pass polarizing functional

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28

Wu, Xuerui, Xiaoyong Du, Feng Yan, Weihua Bai, and Shaohui Song. "Investigation of Potential of GNSS-R Polarization: Theoretical Simulations." Remote Sensing 14, no. 15 (2022): 3700. http://dx.doi.org/10.3390/rs14153700.

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Global navigation satellite system (GNSS) reflectometry (GNSS-R) developed into a promising remote sensing technique. However, few previous related studies considered the potential of its polarization. Owing to lack of sufficient in situ measurement data to support comprehensive investigation of GNSS-R polarization, this study used theoretical models and reference to our previous work to explore this topic. The commonly used microwave scattering models are employed to get the bare soil or vegetation scattering properties of GNSS-R configurations, i.e., the random surface scattering model and t

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29

Sadykov, N. R. "Polarization effects due to the mutual influence of trajectory parameters and polarization." Theoretical and Mathematical Physics 149, no. 1 (2006): 1354–65. http://dx.doi.org/10.1007/s11232-006-0124-3.

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30

Lan, Mi-Xiang, Xue-Feng Wu, and Zi-Gao Dai. "Afterglow Polarizations in a Stratified Medium with Effect of the Equal Arrival Time Surface." Astrophysical Journal 952, no. 1 (2023): 31. http://dx.doi.org/10.3847/1538-4357/acd6ef.

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Abstract The environment of a γ-ray burst has an important influence on the evolution of jet dynamics and its afterglow. Here we investigate the afterglow polarizations in a stratified medium with the equal arrival time surface (EATS) effect. Polarizations of multiband afterglows are predicted. The effects of the parameters of the stratified medium on the afterglow polarizations are also investigated. We found the influences of the EATS effect on the afterglow polarizations become important for off-axis detections and polarization degree (PD) bumps move to later times with the EATS effect. Eve

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31

Asanov, M. M., O. V. Kozhokhina, I. V. Linchevskyi, A. V. Skrypets, and V. D. Tronko. "Photopolarimetric method of polarization radiation parameters determination." Astronomical School’s Report 7, no. 2 (2011): 155–60. http://dx.doi.org/10.18372/2411-6602.07.2155.

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32

Sheppard, Colin J. R., and Elijah Y. S. Yew. "Performance parameters for focusing of radial polarization." Optics Letters 33, no. 5 (2008): 497. http://dx.doi.org/10.1364/ol.33.000497.

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33

Zhongping, HUANG, LEI Zhiyong, HE Zishu, LI Huiyong, ZHANG Liang, and SHEN Haoliang. "Polarization space time adaptive processing based on maximum likelihood polarization vector estimation." Journal of Physics: Conference Series 2235, no. 1 (2022): 012105. http://dx.doi.org/10.1088/1742-6596/2235/1/012105.

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Abstract In airborne radar, signal to clutter plus noise ratio (SCNR) can be improved by utilizing polarization space time adaptive processing (PSTAP). The optimal output SCNR is obtained when the expected polarization-space-time (PST) vector matches the true value. The problem of polarization parameters estimation limits the potential application of PSTAP. The inaccuracy of polarization parameters estimation unevitably causes SCNR loss. In this paper, the effect of expected polarization vector on output SCNR is analyzed on the basis of PSTAP theory. In order to reduce SCNR loss introduced by

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34

Belgacem, Enis, Francesco Iacovelli, Michele Maggiore, Michele Mancarella, and Niccolò Muttoni. "The spectral density of astrophysical stochastic backgrounds." Journal of Cosmology and Astroparticle Physics 2025, no. 04 (2025): 032. https://doi.org/10.1088/1475-7516/2025/04/032.

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Abstract We provide a detailed derivation of the spectral density of the stochastic background generated by the superposition of coalescing compact binaries. We show how the expression often used in the literature emerges from an average over the extrinsic parameters of the binaries (times of arrival, polarization angles, orbit inclinations and arrival directions) and how the Stokes parameters related to circular and linear polarization are set to zero by such averaging procedure. We then consider the effect of shot noise, i.e. the fact that for the superposition of a finite number of sources

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35

Naselsky, P., D. Novikov, I. Novikov, and J. Silk. "Estimation of Signal and Noise Parameters from CMB Polarization Observations." Symposium - International Astronomical Union 201 (2005): 126–33. http://dx.doi.org/10.1017/s0074180900216185.

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We propose a technique for determination of the spectral parameters of the cosmological signal and pixel noise using observational data on CMB polarization without any additional assumptions. We introduce the notion of so called crossing points in the observational maps and derive the theoretical dependence of the total number of crossing points at different level of the polarization. Finally, we use the statistics of the signal in the vicinities of the singular points, where the polarization of the pure CMB vanishes to correct the final result.

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36

Fahad, Ruan, and Chen. "A Wideband Terahertz Transmissive Polarization Manipulator Based on Metasurfaces." Electronics 8, no. 10 (2019): 1068. http://dx.doi.org/10.3390/electronics8101068.

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Wideband and multifunction operation for THz polarization manipulating devices has been desired for a wide range of applications. In this paper, a novel wideband transmissive type polarization manipulator based on metasurfaces is proposed in the THz region. The designed metasurface acts as a multifunctional polarization manipulator, performing linear to circular polarization conversion (LCPC) for relative bandwidth 43.9% (0.94 THz to 1.47 THz) for incident x/y polarizations and a wideband bandpass filter with relative bandwidth 67% (0.713 THz to 1.4346 THz) for incident slant (xy) polarization

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37

Shukla, Namrata, and Ranjana Prakash. "Alteration in non-classicality of light on passing through a linear polarization beam splitter." Modern Physics Letters B 30, no. 21 (2016): 1650289. http://dx.doi.org/10.1142/s0217984916502894.

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We observe the polarization squeezing in the mixture of a two mode squeezed vacuum and a simple coherent light through a linear polarization beam splitter. Squeezed vacuum not being squeezed in polarization, generates polarization squeezed light when superposed with coherent light. All the three Stokes parameters of the light produced on the output port of polarization beam splitter are found to be squeezed and squeezing factor also depends upon the parameters of coherent light.

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38

McCarrick, H., G. Jones, B. R. Johnson, et al. "Design and performance of dual-polarization lumped-element kinetic inductance detectors for millimeter-wave polarimetry." Astronomy & Astrophysics 610 (February 2018): A45. http://dx.doi.org/10.1051/0004-6361/201732044.

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Aims. Lumped-element kinetic inductance detectors (LEKIDs) are an attractive technology for millimeter-wave observations that require large arrays of extremely low-noise detectors. We designed, fabricated and characterized 64-element (128 LEKID) arrays of horn-coupled, dual-polarization LEKIDs optimized for ground-based CMB polarimetry. Our devices are sensitive to two orthogonal polarizations in a single spectral band centered on 150 GHz with Δν∕ν = 0.2. The 65 × 65 mm square arrays are designed to be tiled into the focal plane of an optical system. We demonstrate the viability of these dual-

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39

Wu, Xuerui, and Shuanggen Jin. "A Simulation Study of GNSS-R Polarimetric Scattering from the Bare Soil Surface Based on the AIEM." Advances in Meteorology 2019 (May 8, 2019): 1–9. http://dx.doi.org/10.1155/2019/3647473.

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In the past two decades, global navigation satellite system-reflectometry (GNSS-R) has emerged as a new remote sensing technique for soil moisture monitoring. Some experiments showed that the antenna of V polarization is more favorable to receive the reflected signals, and the interference pattern technique (IPT) was used for soil moisture and retrieval of other geophysical parameters. Meanwhile, the lower satellite elevation angles are most impacted by the multipath. However, electromagnetic theoretical properties are not clear for GNSS-R soil moisture retrieval. In this paper, the advanced i

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40

Gil, José J. "Geometric Interpretation and General Classification of Three-Dimensional Polarization States through the Intrinsic Stokes Parameters." Photonics 8, no. 8 (2021): 315. http://dx.doi.org/10.3390/photonics8080315.

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In contrast with what happens for two-dimensional polarization states, defined as those whose electric field fluctuates in a fixed plane, which can readily be represented by means of the Poincaré sphere, the complete description of general three-dimensional polarization states involves nine measurable parameters, called the generalized Stokes parameters, so that the generalized Poincaré object takes the complicated form of an eight-dimensional quadric hypersurface. In this work, the geometric representation of general polarization states, described by means of a simple polarization object cons

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41

Zhang, Wei Jie, Qi Feng Zhao, Ming Rui Hao, Zhi Min Liu, and Miao Wu. "Simulation of Fallen-Column Geological Structure Detection of Tunnel Face and Parameters Analysis." Applied Mechanics and Materials 394 (September 2013): 357–63. http://dx.doi.org/10.4028/www.scientific.net/amm.394.357.

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In order to study on the advanced detection technology and the sensitivity of the fallen geological structure based on induce polarization method, the hazards of the fallen geological structure before the driving face of coal roadway are analysed. A simplified physical model of the structure is established, which is converted to an equivalent circuit easy to study. Then an induce polarization model of the fallen geological structure is established. And the induce polarization (IP) model is connected with the simulation detection model of geological abnormal mass and the variation curves of the

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42

Munoz-Martin, Joan Francesc, Nereida Rodriguez-Alvarez, Xavier Bosch-Lluis, and Kamal Oudrhiri. "Effective Surface Roughness Impact in Polarimetric GNSS-R Soil Moisture Retrievals." Remote Sensing 15, no. 8 (2023): 2013. http://dx.doi.org/10.3390/rs15082013.

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Single-pass soil moisture retrieval has been a key objective of Global Navigation Satellite System-Reflectometry (GNSS-R) for the last decade. Achieving this goal will allow small satellites with GNSS-R payloads to perform such retrievals at high temporal resolutions. Properly modeling the soil surface roughness is key to providing high-quality soil moisture estimations. In the present work, the Physical Optics and Geometric Optics models of the Kirchhoff Approximation are implemented to the coherent and incoherent components of the reflectometry measurements collected by the SMAP radar receiv

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43

Ge, Jing Hua, Zhe Chen, Yin Fang Chen, et al. "Optimized Design of Parameters for Wedge-Crystal Depolarizer." Applied Mechanics and Materials 110-116 (October 2011): 3351–57. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3351.

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The principle of wedge-crystal depolarizer was introduced and an optimal parameters combination of polarization direction, wedge angle, pupil size was obtained by using Mueller matrix. The design of depolarizer should be determined by crystal refraction index, wavelength, and incident pupil size. Calculation and simulation based on software show that degree of polarization (DOP) can be improved by increasing pupil size and wedge angle. Some significant conclusions for the optimized design of parameters were gained for fabricating crystal depolarizers.

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44

Kim, Cheol Jun, Jae Yeob Lee, Minkyung Ku, Seung Won Lee, Ji-Hoon Ahn, and Bo Soo Kang. "Polarization switching dynamics simulation by using the practical distribution of ferroelectric properties." Applied Physics Letters 122, no. 1 (2023): 012901. http://dx.doi.org/10.1063/5.0131087.

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We investigated the internal bias field and coercive field in a typical ferroelectric thin-film capacitor and simulated polarization switching dynamics using Euler's method. The simulation results agreed well with the experimental results and reflected the well-known polarization domain switching model in which the polarization switching occurs on the order of nucleation, growth, and coalescence. The fit parameters (damping parameters affecting the polarization change rate) also followed a certain distribution. When the expected value was used instead of full distribution, the simulation resul

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45

Arsenijević, J., S. Marković-Kršljanin, A. Kubičela, and S. Jankov. "Common properties of some Be stars optical polarization parameters." Symposium - International Astronomical Union 162 (1994): 236–37. http://dx.doi.org/10.1017/s0074180900214940.

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The long-term changes of the intrinsic polarization percentage are evident in the stars O And, γ Cas, 88 Her (during the period 1974–1992), κ Dra (1979–1992) and BU Tau (1986–1992). The amplitudes of the polarization percentage variations are not more than a half of the percent. The changes of the position angles are within an interval of about 30 degrees.

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46

Monti, Alessio, Luca Scorrano, Simone Tricarico, Filiberto Bilotti, Alessandro Toscano, and Lucio Vegni. "Achieving PMC boundary conditions through metamaterials." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 32, no. 6 (2013): 1876–90. http://dx.doi.org/10.1108/compel-10-2012-0281.

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Purpose – The purpose of this paper is to show how metamaterials with extreme values of permittivity and permeability, may be effectively used to design artificial magnetic conductors (AMC) at a given frequency. In particular, this paper theoretically determines, for the different polarizations of the incidence field, the conditions under which metamaterials can behave as an AMC. Design/methodology/approach – In order to find out the required values of the constitutive parameters, this paper has done a theoretical analysis based on the transmission-line theory. The obtained analytical reflecti

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47

Mikhalev, V. "Pitfalls of statistics-limited X-ray polarization analysis." Astronomy & Astrophysics 615 (July 2018): A54. http://dx.doi.org/10.1051/0004-6361/201731971.

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Context. One of the difficulties with performing polarization analysis is that the mean polarization fraction of sub-divided data sets is larger than the polarization fraction for the integrated measurement. The resulting bias is one of the properties of the generating distribution discussed in this work. The limitations of Gaussian approximations in standard analysis based on Stokes parameters for estimating polarization parameters and their uncertainties are explored by comparing with a Bayesian analysis. The effect of uncertainty on the modulation factor is also shown, since it can have a l

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48

Cięszczyk, Sławomir, and Damian Harasim. "Polarization Influence on Algorithms of TFBG Sensors Data Analysis for Bending Application." Applied Sciences 13, no. 21 (2023): 11701. http://dx.doi.org/10.3390/app132111701.

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In this article we deal with the influence of polarization on determining the bending radius in TFBG (tilted fiber Bragg grating) sensors. The spectrum of TFBG structures changes under the influence of many factors at the same time. In the case of bending radius measurements, additional factors may be the temperature and polarization state of the introduced light. So far, only the cladding mode envelope algorithm has been used to determine the bending radius. An interesting issue seems to be establishing the influence of cross-sensitivity of the spectrum on changes in polarization during bendi

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49

DAS, PRASANTA, PANKAJ JAIN, and SUDIPTA MUKHERJI. "COSMIC BIREFRINGENCE WITHIN THE FRAMEWORK OF HETEROTIC STRING THEORY." International Journal of Modern Physics A 16, no. 24 (2001): 4011–24. http://dx.doi.org/10.1142/s0217751x01004840.

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Low energy string theory predicts the existence of an axion field which can lead to cosmic birefringence. We solve the electromagnetic wave equations in the presence of such an axion and a dilaton field in order to determine their effect on the polarization of light. We find that the presence of dilaton field leads to a nontrivial modification of the final result. We comment on the possibility of discovering such an effect by observations of radio wave polarizations from distant radio galaxies and quasars. We have also determined the limits on the string theory parameters that are imposed by t

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50

Lyakhnovich, Andrew V., Igor V. Semchenko, Andrey L. Samofalov, et al. "Terahertz Polarization-Resolved Spectra of the Metamaterial Formed by Optimally Shaped Omega Elements on a Silicon Substrate at Oblique Incidence of Waves." Photonics 11, no. 2 (2024): 163. http://dx.doi.org/10.3390/photonics11020163.

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The reflection and transmission spectra of a metamaterial formed by omega-shaped elements with pre-calculated optimal parameters on a silicon substrate have been recorded in the terahertz range at oblique incidence for the s- and p-polarizations of the incident wave. The spectra were interpreted within the dipole radiation theory of electromagnetic waves. Both measurement results and analysis provide evidence supporting the presence of a pronounced polarization anisotropy impact in the reflection and transmission of the metamaterial. The potential of these materials to be utilized in the devel

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