Relevant bibliographies by topics / Non-isotropic scattering

Academic literature on the topic 'Non-isotropic scattering'

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Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Non-isotropic scattering"

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Anim-Appiah, K. "Complex envelope correlations for non-isotropic scattering." Electronics Letters 34, no. 9 (1998): 918. http://dx.doi.org/10.1049/el:19980602.

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Sharma, P. "Time-series model for wireless fading channels in isotropic and non-isotropic scattering environments." IEEE Communications Letters 9, no. 1 (January 2005): 46–48. http://dx.doi.org/10.1109/lcomm.2005.1375237.

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Lian, Zhuxian, Lingge Jiang, and Chen He. "A 3-D GBSM Based on Isotropic and Non-Isotropic Scattering for HAP-MIMO Channel." IEEE Communications Letters 22, no. 5 (May 2018): 1090–93. http://dx.doi.org/10.1109/lcomm.2017.2784448.

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SALISBURY, JOHN W., N. M. MILTON, and P. A. WALSH. "Significance of non-isotropic scattering from vegetation for geobotanical remote sensing." International Journal of Remote Sensing 8, no. 7 (July 1987): 997–1009. http://dx.doi.org/10.1080/01431168708954743.

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Sergeev, V. A., G. R. Bikkuzina, and P. T. Newell. "Dayside isotropic precipitation of energetic protons." Annales Geophysicae 15, no. 10 (October 31, 1997): 1233–45. http://dx.doi.org/10.1007/s00585-997-1233-5.

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Abstract. Recently it has been shown that isotropic precipitation of energetic protons on the nightside is caused by a non-adiabatic effect, namely pitch-angle scattering of protons in curved magnetic field lines of the tail current sheet. Here we address the origin of isotropic proton precipitation on the dayside. Computations of proton scattering regions in the magnetopheric models T87, T89 and T95 reveal two regions which contribute to the isotropic precipitation. The first is the region of weak magnetic field in the outer cusp which provides the 1–2° wide isotropic precipitation on closed field lines in a ~2–3 hour wide MLT sector centered on noon. A second zone is formed by the scattering on the closed field lines which cross the nightside equatorial region near the magnetopause which provides isotropic precipitation starting ≈ 1.5–2 h MLT from noon and which joins smoothly the precipitation coming from the tail current sheet. We also analyzed the isotropic proton precipitation using observations of NOAA low altitude polar spacecraft. We find that isotropic precipitation of >30 to >80 keV protons continues around noon forming the continuous oval-shaped region of isotropic precipitation. Part of this region lies on open field lines in the region of cusp-like or mantle precipitation, its equatorward part is observed on closed field lines. Near noon it extends ~1–2° below the sharp boundary of solar electron fluxes (proxy of the open/closed field line boundary) and equatorward of the cusp-like auroral precipitation. The observed energy dispersion of its equatorward boundary (isotropic boundary) agrees with model predictions of expected particle scattering in the regions of weak and highly curved magnetic field. We also found some disagreement with model computations. We did not observe the predicted split of the isotropic precipitation region into separate nightside and dayside isotropic zones. Also, the oval-like shape of the isotropic boundary has a symmetry line in 10–12 MLT sector, which with increasing activity rotates toward dawn while the latitude of isotropic boundary is decreasing. Our conclusion is that for both dayside and nightside the isotropic boundary location is basically controlled by the magnetospheric magnetic field, and therefore the isotropic boundaries can be used as a tool to probe the magnetospheric configuration in different external conditions and at different activity levels.
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Vela-Garcia, L., J. Vázquez Castillo, R. Parra-Michel, and Matthias Pätzold. "An Accurate Hardware Sum-of-Cisoids Fading Channel Simulator for Isotropic and Non-Isotropic Mobile Radio Environments." Modelling and Simulation in Engineering 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/542198.

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The rapid technological development in the field of wireless communications calls for devices capable of reproducing and simulating the behavior of the channel under realistic propagation conditions. This paper presents a hardware fading channel simulator that is able to generate stochastic processes characterized by symmetrical and asymmetrical Doppler power spectral densities (PSDs) depending on the assumption of isotropic or non-isotropic scattering. The concept of the proposed hardware simulator is based on an implementation of the sum-of-cisoids (SOC) method. The hardware simulator is capable of handling any configuration of the cisoid's amplitudes, frequencies, and phases. Each of the cisoids that constitutes the SOC model is implemented using a piecewise polynomial approximation technique. The investigation of the higher-order statistics of the generated fading processes, like the level-crossing rate (LCR) and the average duration of fades (ADF), shows that our design is able to reproduce accurately the key features of realistic channel models that are considered as candidates for the latest wireless communication standards.
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Kanschat, Guido, and José Pablo Lucero Lorca. "A Weakly Penalized Discontinuous Galerkin Method for Radiation in Dense, Scattering Media." Computational Methods in Applied Mathematics 16, no. 4 (October 1, 2016): 563–77. http://dx.doi.org/10.1515/cmam-2016-0023.

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AbstractWe review the derivation of weakly penalized discontinuous Galerkin methods for scattering dominated radiation transport and extend the asymptotic analysis to non-isotropic scattering. We focus on the influence of the penalty parameter on the edges and derive a new penalty for interior edges and boundary fluxes. We study how the choice of the penalty parameters influences discretization accuracy and solver speed.
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Gayley, Kenneth G., and Stanley P. Owocki. "The non-isotropic diffusion approximation in Wolf-Rayet winds." Symposium - International Astronomical Union 163 (1995): 158–59. http://dx.doi.org/10.1017/s0074180900201848.

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We derive the dynamics of a steady-state Wolf-Rayet wind using a non-isotropic diffusion approximation applied to the transfer between strongly overlapping spectral lines. Following the approach of Friend and Castor (1983), the line list is assumed to approximate a statistically parametrized Poisson distribution in frequency, so that photon transport is controlled by an angle-dependent, effectively gray opacity. We find that multiple radiative momentum deposition is greatest when photons undergo a nearly local diffusion, e.g. through scattering between many lines closely spaced in frequency. Our results reiterate the view that the so-called “momentum problem” of WR winds is better characterized as an “opacity problem” of simply identifying enough driving lines. One way of increasing the number of thick lines in WR winds is to transfer opacity from saturated to unsaturated lines, yielding a steeper opacity distribution than that found in OB winds. We also consider the growth of instabilities, and find that WR winds are up to an order of magnitude less unstable than OB winds if both are driven radiatively. However, initially small perturbations can still be multiplied by many orders of magnitude as they advect through WR winds.
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Panchenko, O. F., and L. K. Panchenko. "Relaxation of Highly Non Equilibrium Charge Carriers in Crystals by Low-Energy Electron Influence." Solid State Phenomena 115 (August 2006): 261–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.115.261.

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The cascade process describing the energy loss and relaxation or multiplication of highly non-equilibrium secondary electrons and holes in crystalline platinum irradiated by lowenergy electrons is studied. The pair-creation scattering rates are evaluated in the framework of the statistical model taking into account the electron band structure of platinum. Kinetic equations for the excited electron and hole energy distributions are solved numerically in the isotropic scattering approximation for some primary (excitation) energies Ep which do not exceed the plasma energy.
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SANGAWA, U. "Non-resonant Electromagnetic Scattering Properties of Menger's Sponge Composed of Isotropic Paraelectric Material." IEICE Transactions on Electronics E90-C, no. 2 (February 1, 2007): 484–91. http://dx.doi.org/10.1093/ietele/e90-c.2.484.

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Dissertations / Theses on the topic "Non-isotropic scattering"

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Pollock, Tony Steven, and tony pollock@nicta com au. "On Limits of Multi-Antenna Wireless Communications in Spatially Selective Channels." The Australian National University. Research School of Information Sciences and Engineering, 2003. http://thesis.anu.edu.au./public/adt-ANU20050418.143712.

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Multiple-Input Multiple-Output (MIMO) communications systems using multiantenna arrays simultaneously during transmission and reception have generated significant interest in recent years. Theoretical work in the mid 1990?s showed the potential for significant capacity increases in wireless channels via spatial multiplexing with sparse antenna arrays and rich scattering environments. However, in reality the capacity is significantly reduced when the antennas are placed close together, or the scattering environment is sparse, causing the signals received by different antennas to become correlated, corresponding to a reduction of the effective number of sub-channels between transmit and receive antennas. By introducing the previously ignored spatial aspects, namely the antenna array geometry and the scattering environment, into a novel channel model new bounds and fundamental limitations to MIMO capacity are derived for spatially constrained, or spatially selective, channels. A theoretically derived capacity saturation point is shown to exist for spatially selective MIMO channels, at which there is no capacity growth with increasing numbers of antennas. Furthermore, it is shown that this saturation point is dependent on the shape, size and orientation of the spatial volumes containing the antenna arrays along with the properties of the scattering environment. This result leads to the definition of an intrinsic capacity between separate spatial volumes in a continuous scattering environment, which is an upper limit to communication between the volumes that can not be increased with increasing numbers of antennas within. It is shown that there exists a fundamental limit to the information theoretic capacity between two continuous volumes in space, where using antenna arrays is simply one choice of implementation of a more general spatial signal processing underlying all wireless communication systems.
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Pollock, Tony Steven. "On Limits of Multi-Antenna Wireless Communications in Spatially Selective Channels." Phd thesis, 2003. http://hdl.handle.net/1885/47999.

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Multiple-Input Multiple-Output (MIMO) communications systems using multiantenna arrays simultaneously during transmission and reception have generated significant interest in recent years. Theoretical work in the mid 1990?s showed the potential for significant capacity increases in wireless channels via spatial multiplexing with sparse antenna arrays and rich scattering environments. However, in reality the capacity is significantly reduced when the antennas are placed close together, or the scattering environment is sparse, causing the signals received by different antennas to become correlated, corresponding to a reduction of the effective number of sub-channels between transmit and receive antennas. ¶ By introducing the previously ignored spatial aspects, namely the antenna array geometry and the scattering environment, into a novel channel model new bounds and fundamental limitations to MIMO capacity are derived for spatially constrained, or spatially selective, channels. A theoretically derived capacity saturation point is shown to exist for spatially selective MIMO channels, at which there is no capacity growth with increasing numbers of antennas. Furthermore, it is shown that this saturation point is dependent on the shape, size and orientation of the spatial volumes containing the antenna arrays along with the properties of the scattering environment. ¶ This result leads to the definition of an intrinsic capacity between separate spatial volumes in a continuous scattering environment, which is an upper limit to communication between the volumes that can not be increased with increasing numbers of antennas within. It is shown that there exists a fundamental limit to the information theoretic capacity between two continuous volumes in space, where using antenna arrays is simply one choice of implementation of a more general spatial signal processing underlying all wireless communication systems.
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Book chapters on the topic "Non-isotropic scattering"

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Ahmed, Naeem, Boyu Hua, Qiuming Zhu, and Mao Kai. "A V2V Channel Simulator for Velocity Variations in Non-isotropic Scattering Scenarios." In Machine Learning and Intelligent Communications, 447–58. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66785-6_49.

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Roy, Arabinda, and Rasajit Kumar Bera. "Scattering and Impact Response of Half Plane Crack in Transversely Isotropic and Isotropic Media." In Linear and Non-Linear Deformations of Elastic Solids, 262–73. CRC Press, 2019. http://dx.doi.org/10.1201/9780429319426-15.

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Conference papers on the topic "Non-isotropic scattering"

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Teal, Abhayapala, and Kennedy. "Spatial correlation in non-isotropic scattering scenarios." In IEEE International Conference on Acoustics Speech and Signal Processing ICASSP-02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.1005276.

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Teal, Paul D., Thushara D. Abhayapala, and Rodney A. Kennedy. "Spatial correlation in non-isotropic scattering scenarios." In Proceedings of ICASSP '02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.5745238.

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Valenzuela-Valdes, J. F., M. A. Garcia-Ferndndez, A. M. Martinez-Gonzalez, and D. Sanchez-Hernandez. "Non-isotropic scattering environments with reverberation chambers." In 2nd European Conference on Antennas and Propagation (EuCAP 2007). Institution of Engineering and Technology, 2007. http://dx.doi.org/10.1049/ic.2007.1092.

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Qiuming, Zhu, Xu Dazhua, and Chen Xiaomin. "A modified channel model for non-isotropic scattering enviroments." In Signal Processing (WCSP 2009). IEEE, 2009. http://dx.doi.org/10.1109/wcsp.2009.5371442.

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Ho, J. T. Y. "Generalized Doppler power spectrum for 3D non-isotropic scattering environments." In GLOBECOM '05. IEEE Global Telecommunications Conference, 2005. IEEE, 2005. http://dx.doi.org/10.1109/glocom.2005.1577880.

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Junfei Yang, Jingyu Hua, Weidang Lu, Limin Meng, and Bin Jiang. "Generation of 3-D physical fading channel with non-isotropic scattering." In 2013 International Conference on Wireless Communications and Signal Processing (WCSP). IEEE, 2013. http://dx.doi.org/10.1109/wcsp.2013.6677106.

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Dahech, Wiem, Nazih Hajri, Neji Youssef, Tsutomu Kawabata, and Matthias Patzold. "Outage statistics for Beckmann fading channels in non-isotropic scattering environments." In 2015 21st Asia-Pacific Conference on Communications (APCC). IEEE, 2015. http://dx.doi.org/10.1109/apcc.2015.7412503.

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Ma, Yuanyuan, and Matthias Paetzold. "A Wideband One-Ring MIMO Channel Model Under Non-Isotropic Scattering Conditions." In 2008 IEEE Vehicular Technology Conference (VTC 2008-Spring). IEEE, 2008. http://dx.doi.org/10.1109/vetecs.2008.100.

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Cheng, Xiang, Cheng-Xiang Wang, and David I. Laurenson. "New deterministic and stochastic simulation models for non-isotropic scattering MIMO channels." In the 2009 International Conference. New York, New York, USA: ACM Press, 2009. http://dx.doi.org/10.1145/1582379.1582679.

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Iqbal, Rauf, and Thushara D. Abhayapala. "On statistics of the mobile rayleigh fading channel in non-isotropic scattering environments." In 2007 International Symposium on Communications and Information Technologies. IEEE, 2007. http://dx.doi.org/10.1109/iscit.2007.4392128.

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