Thematische Bibliographien / DIRECTIONAL SCATTERING

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Auswahl der wissenschaftlichen Literatur zum Thema „DIRECTIONAL SCATTERING“

Autor: Grafiati

Veröffentlicht am 11. September 2023

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Zeitschriftenartikel zum Thema "DIRECTIONAL SCATTERING"

Lu, Zhaocheng, und Andrew N. Norris. „Passive nonreciprocity-induced directional wave scattering“. Extreme Mechanics Letters 51 (Februar 2022): 101600. http://dx.doi.org/10.1016/j.eml.2021.101600.

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Shen, Z., und A. Dogariu. „Subradiant directional memory in cooperative scattering“. Nature Photonics 16, Nr. 2 (10.01.2022): 148–53. http://dx.doi.org/10.1038/s41566-021-00926-4.

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Fawcett, John A. „Directional modal scattering by a ridge“. Journal of the Acoustical Society of America 90, Nr. 3 (September 1991): 1554–59. http://dx.doi.org/10.1121/1.401895.

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D’Antonio, Peter. „The directional scattering factor: Experimental determination.“ Journal of the Acoustical Society of America 91, Nr. 4 (April 1992): 2368. http://dx.doi.org/10.1121/1.403367.

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Frisvad, Jeppe Revall, Toshiya Hachisuka und Thomas Kim Kjeldsen. „Directional Dipole Model for Subsurface Scattering“. ACM Transactions on Graphics 34, Nr. 1 (29.12.2014): 1–12. http://dx.doi.org/10.1145/2682629.

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Wiecha, Peter R., Aurélien Cuche, Arnaud Arbouet, Christian Girard, Gérard Colas des Francs, Aurélie Lecestre, Guilhem Larrieu et al. „Strongly Directional Scattering from Dielectric Nanowires“. ACS Photonics 4, Nr. 8 (18.07.2017): 2036–46. http://dx.doi.org/10.1021/acsphotonics.7b00423.

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Jiang, Shen-long, Lu Chen, Xin-xin Yu, Hong-jun Zheng, Ke Lin, Qun Zhang, Xiao-ping Wang und Yi Luo. „Surface Plasmon Assisted Directional Rayleigh Scattering“. Chinese Journal of Chemical Physics 30, Nr. 2 (27.04.2017): 135–38. http://dx.doi.org/10.1063/1674-0068/30/cjcp1611204.

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Langbein, W., und J. M. Hvam. „Directional Scattering Dynamics of Microcavity Polaritons“. physica status solidi (a) 190, Nr. 2 (April 2002): 327–32. http://dx.doi.org/10.1002/1521-396x(200204)190:2<327::aid-pssa327>3.0.co;2-o.

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Ullah, Kaleem, Muhammad Habib, Lujun Huang und Braulio Garcia-Camara. „Analysis of the Substrate Effect on the Zero-Backward Scattering Condition of a Cu2O Nanoparticle under Non-Normal Illumination“. Nanomaterials 9, Nr. 4 (03.04.2019): 536. http://dx.doi.org/10.3390/nano9040536.

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The presence of a substrate is one of the most important limitations of the real application of the directional conditions. These conditions allow the control of the spatial distribution of light scattering of nanoparticles. While the zero-forward condition is quite sensitive to any change of the surrounding medium, like the substrate, the zero-backward scattering seems to be less sensitive and very stable under normal illumination. In this letter, the zero-backward scattering condition was investigated on a homogenous Cu2O spherical subwavelength particle, both theoretically and experimentally. In particular, the influence of the substrate and the impinging direction on the angular distribution of light scattering under this directional condition were studied. We observed that the zero-backward scattering condition was also sensitive to the presence of a substrate beneath when a non-normal illumination was considered. We believe that our finding is quite interesting from a practical point of view and for the real implementation of directional scattering in various applications like cloaking, light-emitting devices, photovoltaic devices, bio-sensing, and many more.

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Wapenaar, Kees, und Jan Thorbecke. „On the Retrieval of the Directional Scattering Matrix from Directional Noise“. SIAM Journal on Imaging Sciences 6, Nr. 1 (Januar 2013): 322–40. http://dx.doi.org/10.1137/12086131x.

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Dissertationen zum Thema "DIRECTIONAL SCATTERING"

Wang, Dongxing. „Directional Optical Antennas, Wafer-Scale Metasurfaces, and Single Molecule Surface-Enhanced Raman Scattering“. Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11159.

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Within the field of optics, one of the topics being currently investigated with considerable interest is that of plasmonics, which refers to the use of surface plasmons on metallic nanostructures to manipulate light. It can be argued that this has been largely driven by two reasons. First, surface plasmons enable light to be concentrated into deep sub-wavelength regions, and therefore provide a means for overcoming the diffraction limit, which states that light can be focused to dimensions no smaller than roughly half the wavelength. Second, recent years have seen rapid development in nanofabrication methods - largely driven by applications in silicon microelectronics - that permit the realization of the metallic nanostructures needed for plasmonics. The goal of this thesis has been to harness these recent dramatic advances in plasmonics to address a long-standing problem in optics: the fact that Raman scattering cross sections are very small.
Engineering and Applied Sciences

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CADEDDU, MATTEO. „DarkSide-20k sensitivity, directional dark matter detection and the role of coherent elastic neutrino-nucleus scattering background“. Doctoral thesis, Università degli Studi di Cagliari, 2018. http://hdl.handle.net/11584/255940.

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The existence of dark matter in the Universe is one of the most fascinating problems that modern physics needs to solve. Nowadays, the most intriguing candidate for dark matter is a so called Weakly Interactive Massive Particle (WIMP), that is a new, yet undiscovered, big-bang relic particle that interacts via gravity and possibly another kind of force. The golden method to observe dark matter is represented by direct searches that aim to spot effects of a possible interaction between a dark matter candidate with the target material of the detector. In this thesis, the 90% confidence level WIMP-nucleon sensitivity curve for DarkSide-20k, a dual-phase liquid argon time projection chamber of 20 tonne active mass to be built at LNGS, has been derived for the first time. This sensitivity curve depends crucially on the background content of the experiment. While DarkSide-20k will be able to keep the instrumental background content to less than 0.1 events for a total exposure of 100 tonne year, so called Coherent Elastic neutrino-Nucleus Scattering (CEnNS), that induces nuclear recoils almost indistinguishable from those potentially induced by WIMPs, will represent a major challenge. The detailed calculation of the expected number of CEnNS in the DarkSide-20k exposure and the study of the spectral distribution of those events has been carried out for the first time in this thesis, demonstrating that this background will be the dominant one for DarkSide-20k, despite the fact that it was neglected until this work. For even large exposures, the sensitivity will be strongly affected by CEnNS background. Thus, it is of utmost importance to find a way to distinguish a neutrino from a WIMP interaction. In this thesis, the potentiality of a directional tonne-scale DM detector located at LNGS has been studied in detail. The results obtained confirm that the development of experimental technologies able to couple directional sensitivity with large fiducial masses (many tonnes) and the ability to collect large exposures free of background from beta/gamma events and neutron-induced nuclear recoils is a priority for future dark matter detectors. Finally, the uncertainty on the CEnNS scattering cross section affects significantly the number of expected background events and it is dominated by the nuclear form factor parametrization. Since neutrinos couples preferentially with neutrons, the lack of knowledge of the neutron distribution and its associated radius plays a fundamental role. In this contest, the first experimental observation made in 2017 by the COHERENT Collaboration of a CEnNS process, provides a valuable occasion to experimentally constrain for the first time the CEnNS phenomenology. In this thesis, the first determination of the average neutron radius of Caesium and Iodine and the difference between the neutron and proton radii, known as the "neutron skin", has been obtained. The radius of the neutron density distribution is a crucial ingredient for understanding the background of future dark matter detectors and also the nuclear matter equation of state, which plays an essential role in understanding several processes, like nuclei in laboratory experiments, heavy ion collisions, the structure and evolution of compact astrophysical objects as neutron stars.

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Schaff, Florian Peter [Verfasser], Franz [Akademischer Betreuer] Pfeiffer, Hendrik [Gutachter] Dietz, Christian [Gutachter] Schroer und Franz [Gutachter] Pfeiffer. „Directional Small-Angle X-ray Scattering Computed Tomography : Reconstruction of the Local Differential Cross Section / Florian Peter Schaff ; Gutachter: Hendrik Dietz, Christian Schroer, Franz Pfeiffer ; Betreuer: Franz Pfeiffer“. München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1177241374/34.

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Murad, Hamidouche. „Simulation de la scintillation Interstellaire des Pulsars. Caracterisation des 'Extreme Scattering Events' Observes en direction de B1937+21“. Phd thesis, Université d'Orléans, 2003. http://tel.archives-ouvertes.fr/tel-00006869.

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Nous tentons dans cette thèse d?interpréter les Extreme Scattering Events (ESE?s) par la turbulence naturelle du milieu interstellaire (MIS) ionisé. Il est bien connu que les inhomogénéités du MIS ionisé suivent un spectre de puissance de Kolmogorov. Dans l?approximation de l?écran mince, on montre d?abord en optique géométrique qu?on peut produire le phénomène d?ESE. On effectue ensuite le calcul dans le cadre de la diffraction de Fresnel. On obtient des ?pseudo?-ESEs qui ne sont pas très profonds et n?apparaissent pas au même moment aux trois fréquences simulées comme dans le cas des observations du pulsar B1937+21 au radiotélescope de Nançay. On montre par contre que les paramètres obtenus de la scintillation simulée sont en très bon accord avec les observations et la théorie. Cette étude conduite sur un ?ALPHA server? est une première étape nécessaire et importante dans l?étude de la scintillation interstellaire.

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Hamidouche, Mourad. „Simulation de la scintillation interstellaire des pulsars : caractérisation des Extreme scattering events observés en direction de B1937+21“. Orléans, 2003. http://www.theses.fr/2003ORLE2002.

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Nous tentons dans cette thèse d'interpréter les Extreme Scattering Events (ESE's) par la turbulence naturelle du milieu interstellaire (MIS) ionisé. Il est bien connu que les inhomogénéités du MIS ionisé suivent un spectre de puissance de Kolmogorov. Dans l'approximation de l'écran mince, on montre d'abord en optique géométrique qu'on peut produire le phénomène d'ESE. On effectue ensuite le calcul dans le cadre de la diffraction de Fresnel. On obtient des pseudo-ESEs qui ne sont pas très profonds et n'apparaissent pas au même moment aux trois fréquences simulées comme dans le cas des observations du pulsar B1937+21 au radiotélescope de Nançay. On montre par contre que les paramètres obtenus de la scintillation simulée sont en très bon accord avec les observations et la théorie. Cette étude conduite sur un ALPHA server est une première étape nécessaire et importante dans l'étude de la scintillation interstellaire.

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Hunter, Brandon. „Channel Probing for an Indoor Wireless Communications Channel“. BYU ScholarsArchive, 2003. https://scholarsarchive.byu.edu/etd/64.

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The statistics of the amplitude, time and angle of arrival of multipaths in an indoor environment are all necessary components of multipath models used to simulate the performance of spatial diversity in receive antenna configurations. The model presented by Saleh and Valenzuela, was added to by Spencer et. al., and included all three of these parameters for a 7 GHz channel. A system was built to measure these multipath parameters at 2.4 GHz for multiple locations in an indoor environment. Another system was built to measure the angle of transmission for a 6 GHz channel. The addition of this parameter allows spatial diversity at the transmitter along with the receiver to be simulated. The process of going from raw measurement data to discrete arrivals and then to clustered arrivals is analyzed. Many possible errors associated with discrete arrival processing are discussed along with possible solutions. Four clustering methods are compared and their relative strengths and weaknesses are pointed out. The effects that errors in the clustering process have on parameter estimation and model performance are also simulated.

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Yang, Shang-Jan, und 楊尚展. „Gold nanoparticle assembly formation with directional extension outside the focus induced by cooperative optical trapping, scattering and interference“. Thesis, 2017. http://ndltd.ncl.edu.tw/handle/99j8rv.

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碩士
國立交通大學
應用化學系碩博士班
106
We demonstrate optical trapping and assembling of 200 nm gold nanoparticles at glass/solution interface with tightly focused 1064 nm continuous wave laser through the measurement on dark-field scattering imaging and confocal spectroscopy. A single gold nanoparticle assembly is formed at the interface, and this assembly is directionally and dynamically extended outside the focus along the direction perpendicular to the linear polarization, while the nanoparticles are trapped only inside the focus with conventional optical trapping. With circular polarization, the assembly shows circular shape extending outside the focus. The polarization dependence, laser power dependence, and nanoparticle size dependence are examined. We consider that these assembling behaviors are relative to scattered light of the trapping laser by the gold nanoparticles. The results of extinction spectra represents that the assembly is optically coupled through long-range interaction by light scattering. Furthermore, the single nanoparticle-level analysis is conducted to observe the initial stage of these assembling dynamics. The nanoparticles are aligned in straight line perpendicular to the linear polarization with certain interparticle distance which corresponds to laser wavelength, while two-dimensionally closed-pack structure is formed with circular polarization. The interparticle distance corresponds to optical binding force generated by interference of light scattering of gold nanoparticles. By integrating the results, the assembling mechanism is proposed.

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DEVI, INDER. „DESIGN AND ANALYSIS OF ALL OPTICAL DIELECTRIC CYLINDRICAL NANOANTENNAS“. Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15240.

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In this thesis, we theoretically demonstrate ultra-directional, azimuthally symmetric forward scattering by dielectric cylindrical nanoantennas for futuristic nanophotonic applications in visible and near-infrared regions. Electric and magnetic dipoles have been optically induced in the nano-cylinders at the resonant wavelengths. It has been demonstrated that the cylindrical dielectric nanoparticles exhibit complete suppression of backward scattering and improved forward scattering at first generalized Kerker’s condition. The influence of gap between nano-cylinder elements on the scattering pattern of the homodimers has been demonstrated. Further, for highly directive applications a linear chain of ultra-directional cylindrical nanoantenna array has been proposed. The effect of the dimensions and material of the dielectric nanocylinder on the scattering properties of the cylindrical nanoantenna has been analyzed using finite element method (FEM). It has been observed that the scattering characteristics of dielectric cylindrical nanoantennas are highly dependent on the dielectric material and aspect ratio of nanocylinder. It has been demonstrated that as dielectric permittivity of the nanocylinder decreases the gap between electric and magnetic resonance decreases hence the directivity increases. We have analyzed that the variation in diameter of nanocylinder has great influence on the strength of interference of electric and magnetic dipolar resonances. As the radius of the nanocylinder is increased, the electric and magnetic dipolar resonances shift towards the higher wavelengths, however no significant change has been observed with the increase in height. Thus, the cylindrical nanoparticles can be used for the design and development of tunable unidirectional nanoantenna applications in visible to near infra-red range.

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Guinea, Montalvo Jose 1980. „An Artistic Approach for Intuitive Control of Light Transfer in Participating Media“. Thesis, 2012. http://hdl.handle.net/1969.1/148420.

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The sole purpose of every form of visual representation is to make something look believable. Even among abstract or conceptual representation, the purpose is to create something that within the defined visual language the audience will consider believable and accepted. In the field of computer generated representation there are numerous visual languages that have been developed throughout the years, attempting to solve different visualization or artistic problems. This thesis presents an alternative light transfer model for participating media focused on the intuitive control of the illumination data and the artistic value of the resulting image. The purpose is not focused on accurately modeling lights physical behavior and its interaction with the surfaces and elements. My thesis describes an artistic approach which aims to offer an organic and intuitive control of the glow and temperature of the effects of participating media and direct the value and hues through the surfaces. The system described in the thesis approximates light transfer through a given volume by calculating light contribution in the volume with discreet sampling and subsequently gathering these values to determine the diffuse scattering contribution for the volume. I will also discuss the assumptions made to allow such approximations, as well as how the intuitive control offered by the approach and these approximations allow new forms or representation and artistic direction.

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„A New Model for Cross-polarization Scattering from Perfect Conducting Random Rough Surfaces in Backscattering Direction“. Master's thesis, 2017. http://hdl.handle.net/2286/R.I.46239.

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abstract: Scattering from random rough surface has been of interest for decades. Several methods were proposed to solve this problem, and Kirchho approximation (KA) and small perturbation method (SMP) are among the most popular. Both methods provide accurate results on rst order scattering, and the range of validity is limited and cross-polarization scattering coecient is zero for these two methods unless these two methods are carried out for higher orders. Furthermore, it is complicated for higher order formulation and multiple scattering and shadowing are neglected in these classic methods. Extension of these two methods has been made in order to x these problems. However, it is usually complicated and problem specic. While small slope approximation is one of the most widely used methods to bridge KA and SMP, it is not easy to implement in a general form. Two scale model can be employed to solve scattering problems for a tilted perturbation plane, the range of validity is limited. A new model is proposed in this thesis to deal with cross-polarization scattering phenomenon on perfect electric conducting random surfaces. Integral equation is adopted in this model. While integral equation method is often combined with numerical method to solve the scattering coecient, the proposed model solves the integral equation iteratively by analytic approximation. We utilize some approximations on the randomness of the surface, and obtain an explicit expression. It is shown that this expression achieves agreement with SMP method in second order.
Dissertation/Thesis
Masters Thesis Electrical Engineering 2017

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Bücher zum Thema "DIRECTIONAL SCATTERING"

Pierson, Willard J. Oceanographic and meteorological research based on the data products of SEASAT: Final technical report for NASA grant NAGW-266. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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K, Moore Richard, und United States. National Aeronautics and Space Administration., Hrsg. Correction of WindScat scatterometric measurements by combining with AMSR radiometric data. Lawrence, Kan: Radar Systems and Remote Sensing Laboratory, University of Kansas Center for Research, 1996.

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(Editor), H. John Caulfield, und Chandra S. Vikram (Editor), Hrsg. New Directions in Holography and Speckles. American Scientific Publishers, 2006.

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Morawetz, Klaus. Scattering on a Single Impurity. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0004.

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Evolution of a many-body system consists of permanent collisions among particles. Looking at the motion of a single particle, one can identify encounters by which a particle abruptly changes the direction of flight, these are seen as true collisions, and small-angle encounters, which in sum act as an applied force rather than randomising collisions. The scattering on impurities is used to introduce the mentioned mechanisms and, in particular, to show how they affect each other. Point impurities are assumed, i.e. impurities the potential of which is restricted to a single atomic site of the crystal lattice. In this case interaction potentials never overlap and many-body effects are due to nonlocal character of the quantum particle. To introduce elementary components of the formalism, in this chapter we first describe the interaction of an electron with a single impurity. Lippman–Schwinger equations are derived and the physics behind the collision delay, dissipativeness and optical theorems is explored.

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Saito, R., A. Jorio, J. Jiang, K. Sasaki, G. Dresselhaus und M. S. Dresselhaus. Optical properties of carbon nanotubes and nanographene. Herausgegeben von A. V. Narlikar und Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533053.013.1.

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This article examines the optical properties of single-wall carbon nanotubes (SWNTs) and nanographene. It begins with an overview of the shape of graphene and nanotubes, along wit the use of Raman spectroscopy to study the structure and exciton physics of SWNTs. It then considers the basic definition of a carbon nanotube and graphene, focusing on the crystal structure of graphene and the electronic structure of SWNTs, before describing the experimental setup for confocal resonance Raman spectroscopy. It also discusses the process of resonance Raman scattering, double-resonance Raman scattering, and the Raman signals of a SWNT as well as the dispersion behavior of second-order Raman modes, the doping effect on the Kohn anomaly of phonons, and the elastic scattering of electrons and photons. The article concludes with an analysis of excitons in SWNTs and outlines future directions for research.

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Buchteile zum Thema "DIRECTIONAL SCATTERING"

Ben-Menahem, Ari. „Vector-Scattering of Elastic Waves by Directional Structural Space Gradients“. In Scattering and Attenuations of Seismic Waves, Part I, 133–46. Basel: Birkhäuser Basel, 1988. http://dx.doi.org/10.1007/978-3-0348-7722-0_8.

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Wiecha, Peter R., Aurélien Cuche, Houssem Kallel, Gérard Colas des Francs, Aurélie Lecestre, Guilhem Larrieu, Vincent Larrey et al. „Fano-resonances in High Index Dielectric Nanowires for Directional Scattering“. In Springer Series in Optical Sciences, 283–309. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99731-5_12.

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Liang, Yusheng, Bo Li, Zhongjiang Yan, Mao Yang, Xiaofei Jiang und Hang Zhang. „Collision Scattering Through Multichannel in Synchronous Directional Ad Hoc Networks“. In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 183–93. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78078-8_19.

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Kitayama, Yoshiharu. „Shield-Free Directional Gamma-Ray Detector Using Small-Angle Compton Scattering“. In Gamma Ray Imaging, 165–79. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-30666-2_8.

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González, A., S. Hagmann, T. Quinteros, B. Krässig, R. Koch, A. Skutlartz und H. Schmidt-Böcking. „Strong directional out-of-plane scattering in multiple ionizing highly-charged ion-atom collisions“. In Atomic Physics of Highly Charged Ions, 299–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76658-9_92.

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DeSanto, John A., und Richard J. Wombell. „Rough Surface Scattering“. In Directions in Electromagnetic Wave Modeling, 407–15. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-3677-6_41.

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Devaney, Anthony J. „Approximate Scattering Models in Inverse Scattering: Past, Present, and Future“. In Directions in Electromagnetic Wave Modeling, 507–15. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-3677-6_51.

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Lu, I.-Tai, und Bai-Lin Ma. „Combinations of Local Scattering Operators and Global Propagators“. In Directions in Electromagnetic Wave Modeling, 101–10. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-3677-6_10.

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Heyman, Ehud. „Complex Source Pulsed Beams: Propagation, Scattering and Applications“. In Directions in Electromagnetic Wave Modeling, 87–100. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-3677-6_9.

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Higgins, K., und P. G. Burke. „Electron Scattering by Diatomic Molecules Adsorbed on Surfaces“. In New Directions in Atomic Physics, 217–22. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4721-1_20.

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Konferenzberichte zum Thema "DIRECTIONAL SCATTERING"

Shen, Zhean, und Aristide Dogariu. „Subradiant Directional Memory in Cooperative Scattering“. In CLEO: QELS_Fundamental Science. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.fth5a.7.

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Using ensembles of coupled point-like scatterers, we demonstrate long-living, backscattering directional memory in spatially bounded random media. This counter-intuitive phenomenon emerges from subradiant quasi-modes located in the vicinity of medium’s interface.

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Anwar Siraji, Ashfaqul, und Yang Zhao. „Enhanced directional scattering by core-shell microspheres“. In 2018 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP). IEEE, 2018. http://dx.doi.org/10.1109/imws-amp.2018.8457160.

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Gubsky, Dmitry S., Anatoly B. Kleschenkov und Gennadiy F. Zargano. „Computer Model of Microstrip Directional Coupler for Virtual Laboratory“. In 2023 Radiation and Scattering of Electromagnetic Waves (RSEMW). IEEE, 2023. http://dx.doi.org/10.1109/rsemw58451.2023.10202158.

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Beck, Paul, Martin Neugebauer und Peter Banzer. „High-Speed Detection of Directional Scattering for Nanolocalization“. In Frontiers in Optics. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/fio.2020.jtu1a.8.

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Naraghi, Roxana Rezvani, Sergey Sukhov und Aristide Dogariu. „Designing All-Dielectric Structures for Efficient Directional Scattering“. In Frontiers in Optics. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/fio.2015.fth4f.6.

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Thomas, Michael E., Jessica Ma, Patrica McGuiggan und M. B. Airola. „Nondestructive characterization of aged paper using spectral and directional reflection measurements“. In Reflection, Scattering, and Diffraction from Surfaces VI, herausgegeben von Leonard M. Hanssen. SPIE, 2018. http://dx.doi.org/10.1117/12.2323108.

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Surzhikov, Sergey. „Spectral and Narrow Band Directional Emissivity of Light-Scattering and Non-Scattering Volumes“. In 8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3324.

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Bishop, Michael W., Samuel D. Butler und Michael A. Marciniak. „Analysis of hybrid directional volumetric scatter terms for enhanced microfacet BRDF modeling“. In Reflection, Scattering, and Diffraction from Surfaces VII, herausgegeben von Leonard M. Hanssen. SPIE, 2020. http://dx.doi.org/10.1117/12.2568046.

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Kotte, T. P. S., A. J. L. Adam und H. P. Urbach. „Achieving directional scattering through a phase difference in composite nanoparticles“. In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/cleo_at.2023.jtu2a.124.

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We show that the scattering of light by a composite nanoparticle leads to directional scattering through the phase difference between the light scattered by each of the materials. The resulting scatter pattern is experimentally verified.

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Dogra, Sonam, Reena und Ajeet Kumar. „Directional Forward Scattering by Linear Chain of Cylindrical Nanoparticles“. In Frontiers in Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/fio.2017.jw3a.66.

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Berichte der Organisationen zum Thema "DIRECTIONAL SCATTERING"

Lin, S., W. Feng, J. C. Powelson, R. J. Feuerstein und L. Bintz. Scattering-Induced Crosstalk in Active Directional Couplers. Fort Belvoir, VA: Defense Technical Information Center, Februar 1996. http://dx.doi.org/10.21236/ada305408.

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Irudayaraj, Joseph, Ze'ev Schmilovitch, Amos Mizrach, Giora Kritzman und Chitrita DebRoy. Rapid detection of food borne pathogens and non-pathogens in fresh produce using FT-IRS and raman spectroscopy. United States Department of Agriculture, Oktober 2004. http://dx.doi.org/10.32747/2004.7587221.bard.

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Rapid detection of pathogens and hazardous elements in fresh fruits and vegetables after harvest requires the use of advanced sensor technology at each step in the farm-to-consumer or farm-to-processing sequence. Fourier-transform infrared (FTIR) spectroscopy and the complementary Raman spectroscopy, an advanced optical technique based on light scattering will be investigated for rapid and on-site assessment of produce safety. Paving the way toward the development of this innovative methodology, specific original objectives were to (1) identify and distinguish different serotypes of Escherichia coli, Listeria monocytogenes, Salmonella typhimurium, and Bacillus cereus by FTIR and Raman spectroscopy, (2) develop spectroscopic fingerprint patterns and detection methodology for fungi such as Aspergillus, Rhizopus, Fusarium, and Penicillium (3) to validate a universal spectroscopic procedure to detect foodborne pathogens and non-pathogens in food systems. The original objectives proposed were very ambitious hence modifications were necessary to fit with the funding. Elaborate experiments were conducted for sensitivity, additionally, testing a wide range of pathogens (more than selected list proposed) was also necessary to demonstrate the robustness of the instruments, most crucially, algorithms for differentiating a specific organism of interest in mixed cultures was conceptualized and validated, and finally neural network and chemometric models were tested on a variety of applications. Food systems tested were apple juice and buffer systems. Pathogens tested include Enterococcus faecium, Salmonella enteritidis, Salmonella typhimurium, Bacillus cereus, Yersinia enterocolitis, Shigella boydii, Staphylococus aureus, Serratiamarcescens, Pseudomonas vulgaris, Vibrio cholerae, Hafniaalvei, Enterobacter cloacae, Enterobacter aerogenes, E. coli (O103, O55, O121, O30 and O26), Aspergillus niger (NRRL 326) and Fusarium verticilliodes (NRRL 13586), Saccharomyces cerevisiae (ATCC 24859), Lactobacillus casei (ATCC 11443), Erwinia carotovora pv. carotovora and Clavibacter michiganense. Sensitivity of the FTIR detection was 103CFU/ml and a clear differentiation was obtained between the different organisms both at the species as well as at the strain level for the tested pathogens. A very crucial step in the direction of analyzing mixed cultures was taken. The vector based algorithm was able to identify a target pathogen of interest in a mixture of up to three organisms. Efforts will be made to extend this to 10-12 key pathogens. The experience gained was very helpful in laying the foundations for extracting the true fingerprint of a specific pathogen irrespective of the background substrate. This is very crucial especially when experimenting with solid samples as well as complex food matrices. Spectroscopic techniques, especially FTIR and Raman methods are being pursued by agencies such as DARPA and Department of Defense to combat homeland security. Through the BARD US-3296-02 feasibility grant, the foundations for detection, sample handling, and the needed algorithms and models were developed. Successive efforts will be made in transferring the methodology to fruit surfaces and to other complex food matrices which can be accomplished with creative sampling methods and experimentation. Even a marginal success in this direction will result in a very significant breakthrough because FTIR and Raman methods, in spite of their limitations are still one of most rapid and nondestructive methods available. Continued interest and efforts in improving the components as well as the refinement of the procedures is bound to result in a significant breakthrough in sensor technology for food safety and biosecurity.

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