Bibliografie tematiche / Radiative and effective properties

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Letteratura scientifica selezionata sul tema "Radiative and effective properties"

Autore: Grafiati

Pubblicato: 7 luglio 2024

Ultima modifica: 7 luglio 2024

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Articoli di riviste sul tema "Radiative and effective properties"

Cathey, H. M. "Scientific balloon effective radiative properties." Advances in Space Research 21, no. 7 (1998): 979–82. http://dx.doi.org/10.1016/s0273-1177(97)01084-3.

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Zhang, Chongshan, Abraham Kribus, and Rami Ben-Zvi. "Effective Radiative Properties of a Cylinder Array." Journal of Heat Transfer 124, no. 1 (2001): 198–200. http://dx.doi.org/10.1115/1.1423317.

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Fully anisotropic problems are found where the radiative interaction is due to small-scale elements that lack spherical symmetry, for example: fibrous insulation, finned heat sinks, plant canopies, and some solar energy absorbers. We present the effective bulk optical properties of a PM composed of small-scale opaque cylinders. The properties are derived from data generated by detailed Monte-Carlo numerical experiments. The data reduction procedure is relatively simple and does not require a full solution and optimization of the Radiative Transfer Equation. Benchmark cases are presented, comparing an exact solution (with geometric detail of the cylinder array) and an approximate solution using a continuous PM model with the effective volumetric properties.

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Kishore, Ravi Anant, Chuck Booten, and Sajith Wijesuriya. "Effective properties of semitransparent radiative cooling materials with spectrally variable properties." Applied Thermal Engineering 205 (March 2022): 118048. http://dx.doi.org/10.1016/j.applthermaleng.2022.118048.

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Lee, Wan-Ho, and Richard C. J. Somerville. "Effects of alternative cloud radiation parameterizations in a general circulation model." Annales Geophysicae 14, no. 1 (1996): 107–14. http://dx.doi.org/10.1007/s00585-996-0107-6.

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Abstract. Using the National Center for Atmospheric Research (NCAR) general circulation model (CCM2), a suite of alternative cloud radiation parameterizations has been tested. Our methodology relies on perpetual July integrations driven by ±2 K sea surface temperature forcing. The tested parameterizations include relative humidity based clouds and versions of schemes involving a prognostic cloud water budget. We are especially interested in testing the effect of cloud optical thickness feedbacks on global climate sensitivity. All schemes exhibit negative cloud radiation feedbacks, i.e., cloud moderates the global warming. However, these negative net cloud radiation feedbacks consist of quite different shortwave and longwave components between a scheme with interactive cloud radiative properties and several schemes with specified cloud water paths. An increase in cloud water content in the warmer climate leads to optically thicker middle- and low-level clouds and in turn negative shortwave feedbacks for the interactive radiative scheme, while a decrease in cloud amount leads to a positive shortwave feedback for the other schemes. For the longwave feedbacks, a decrease in high effective cloudiness for the schemes without interactive radiative properties leads to a negative feedback, while no distinct changes in effective high cloudiness and the resulting feedback are exhibited for the scheme with interactive radiative properties. The resulting magnitude of negative net cloud radiation feed-back is largest for the scheme with interactive radiative properties. Even though the simulated values of cloud radiative forcing for the present climate using this method differ most from the observational data, the approach shows great promise for the future.

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Bouraoui, Chaima, and Fayçal Ben Nejma. "Identification of the Effective Radiative Properties of Cylindrical Packed Bed Porous Media." WSEAS TRANSACTIONS ON HEAT AND MASS TRANSFER 19 (January 26, 2024): 1–17. http://dx.doi.org/10.37394/232012.2024.19.1.

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Understanding radiative exchange in a porous medium is a crucial step that can provide significant insights and improvements in its characteristics, enhancing its practical utility across various industrial applications. In this paper, a numerical model, utilizing the finite element method (FEM), was developed to predict the radiative transfer between a diffusely/specularly reflecting cylindrical packed bed porous medium and a plane heating surface. Four different structures of the medium were suggested to examine the effect of the particles ‘disposition on the radiative properties of the medium. The assessment of normalized flux distribution enables the computation of effective radiative properties including reflectivity, transmissivity, and absorptivity for particles exhibiting diffuse and specular reflection. The results underscore the significant influence of particle arrangement on media properties. The structure of the second model allowed for the attainment of an opaque surface from the first layer. Meaningful correlations can be established from the presented curves, offering a streamlined and accurate method for determining effective radiative property coefficients based on emissivity in future model applications.

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Lee, Siu-Chun, Susan White, and Jan A. Grzesik. "Effective radiative properties of fibrous composites containing spherical particles." Journal of Thermophysics and Heat Transfer 8, no. 3 (1994): 400–405. http://dx.doi.org/10.2514/3.556.

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Zelinka, Mark D., Christopher J. Smith, Yi Qin, and Karl E. Taylor. "Comparison of methods to estimate aerosol effective radiative forcings in climate models." Atmospheric Chemistry and Physics 23, no. 15 (2023): 8879–98. http://dx.doi.org/10.5194/acp-23-8879-2023.

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Abstract. Uncertainty in the effective radiative forcing (ERF) of climate primarily arises from the unknown contribution of aerosols, which impact radiative fluxes directly and through modifying cloud properties. Climate model simulations with fixed sea surface temperatures but perturbed atmospheric aerosol loadings allow for an estimate of how strongly the planet's radiative energy budget has been perturbed by the increase in aerosols since pre-industrial times. The approximate partial radiative perturbation (APRP) technique further decomposes the contributions to the direct forcing due to aerosol scattering and absorption and to the indirect forcing due to aerosol-induced changes in cloud scattering, amount, and absorption, as well as the effects of aerosols on surface albedo. Here we evaluate previously published APRP-derived estimates of aerosol effective radiative forcings from these simulations conducted in the sixth phase of the Coupled Model Intercomparison Project (CMIP6) and find that they are biased as a result of two large coding errors that – in most cases – fortuitously compensate. The most notable exception is the direct radiative forcing from absorbing aerosols, which is more than 40 % larger averaged across CMIP6 models in the present study. Correcting these biases eliminates the residuals and leads to better agreement with benchmark estimates derived from double calls to the radiation code. The APRP method – when properly implemented – remains a highly accurate and efficient technique for diagnosing aerosol ERF in cases where double radiation calls are not available, and in all cases it provides quantification of the individual contributors to the ERF that are highly useful but not otherwise available.

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Yeh, H. Y. M., N. Prasad, and R. F. Adler. "Tabulation of Mie properties for an effective microwave radiative model." Meteorology and Atmospheric Physics 42, no. 2 (1990): 105–12. http://dx.doi.org/10.1007/bf01041758.

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MARSHALL, T. J., and D. G. C. MCKEON. "RADIATIVE PROPERTIES OF THE STUECKELBERG MECHANISM." International Journal of Modern Physics A 23, no. 05 (2008): 741–48. http://dx.doi.org/10.1142/s0217751x08039499.

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We examine the mechanism for generating a mass for a U(1) vector field introduced by Stueckelberg. First, it is shown that renormalization of the vector mass is identical to the renormalization of the vector field on account of gauge invariance. We then consider how the vector mass affects the effective potential in scalar quantum electrodynamics at one-loop order. The possibility of extending this mechanism to couple, in a gauge invariant way, a charged vector field to the photon is discussed.

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Jenblat, S. S., and O. V. Volkova. "Estimation of multi-layer coating efficiency for passive radiative cooling." Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering 5, no. 2 (2021): 37–46. http://dx.doi.org/10.25206/2588-0373-2021-5-2-37-46.

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Passive radiative cooling is a promising direction in energy conservation and environmental protection. One of the ways to increase the efficiency of radiative cooling systems is the use of multi-layer coatings. In recent years, several novel materials with high emissivity have been proposed, which allow the creation of radiators that provide an average daily cooling power of approximately 100 W/m2 during daytime. Based on the developed mathematical model, the optical properties of the multi-layer coating for the radiative cooling system were evaluated by the Transfer Matrix Method and the effectiveness of radiative cooling was determined due to the use of the multi-layer coating in the climatic conditions of Syria (Latakia). The results of modeling the atmospheric transmittance in the summer months in Syria (Latakia) are presented. The developed mathematical model, methods for modeling atmospheric transmittance, calculating solar radiation, and evaluating the optical properties of multi-layer coating, allow determining an effective multi-layer coating for radiative cooling systems in any climatic conditions

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Tesi sul tema "Radiative and effective properties"

Wang, Xiaojia. "Study of the radiative properties of aligned carbon nanotubes and silver nanorods." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42871.

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Arrays of nanotubes/rods made of appropriate materials can yield unique radiative properties, such as large absorption and optical anisotropy, with broad applications from high-efficiency emitters and absorbers for energy conversion to the polarization conversion via anisotropic responses. The objective of this dissertation is to investigate the radiative properties of arrays formed by aligned carbon nanotubes (CNTs) and silver nanorods (AgNRs). The CNT arrays used in the present study consist of multi-walled CNTs synthesized vertically on silicon substrates using thermal chemical vapor deposition. Their close-to-unity absorptance is demonstrated by measuring the directional-hemispherical reflectance in the visible and near-infrared spectral ranges using an integrating sphere. The bidirectional reflectance distribution function and angle-resolved reflectance were measured at the 635-nm wavelength. The results demonstrate that high-absorptance CNT arrays may be diffusely or specularly reflecting and have important applications in radiometry. Theoretical modeling based on the effective medium theory (EMT) and reflectivity of an anisotropic medium are developed to explain the high absorption and polarization dependence. The effective optical constants of the CNT array for both ordinary and extraordinary polarizations are quantitatively determined by fitting the angle-resolved reflectance. The AgNR arrays used in the present study were fabricated using oblique angle deposition, which results in inclined Ag nanorods that can be modeled as an effective homogenous and optically anisotropic thin film. The spectral and directional radiative properties of AgNRs grown on different substrates, including a glass slab with a silver film, and compact disc gratings, were characterized at the 635-nm and 977-nm wavelengths for different polarizations. The results are analyzed based on the EMT, rigorous coupled-wave analysis, and anisotropic thin-film optics. The results of this dissertation help gain a better understanding of radiative properties of anisotropic nanostructures for potential applications in high-efficiency energy conversion, radiometric devices, and optical systems.

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Guerra, Timothée. "Interaction lumière-matière dans des suspensions de nanoparticules : homogénéisation et conception de nouvelles propriétés optiques." Electronic Thesis or Diss., Orléans, 2024. http://www.theses.fr/2024ORLE1005.

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Les milieux désordonnés composés de nanoparticules revêtent une grande importance dans de nombreuses applications, particulièrement celles liées à l'efficacité énergétique telle que le refroidissement radiatif. Dès lors, la compréhension de l'interaction lumière-matière est primordiale, mais s'avère très complexe. En effet, ces études doivent bien souvent passer par la résolution des équations de Maxwell dans des systèmes constitués de milliers de particules, permettant ainsi de prendre en compte les phénomènes de diffusion et d'interférences. De façon à réduire l'importante charge numérique qui en découle, ce travail de thèse se focalise sur des systèmes 2D en incluant quelques discussions sur des systèmes 3D. Dans ce contexte, le premier volet de ce manuscrit s'intéresse au concept d'homogénéisation pour des systèmes de particules petites par rapport à la longueur d'onde du rayonnement et pouvant présenter des résonances. Cette étude met en évidence des comportements exotiques permettant de discuter, entre autres, du lien entre homogénéisation et parties cohérente et incohérente du champ diffusé. Le second volet est dédié à l'optimisation de l'absorption du rayonnement dans des lames minces par rapport à la longueur d'onde, et composées de nanoparticules. On montre que l'utilisation exclusive de particules résonantes ne donne lieu qu'à une absorption plafonnant à 70%. Néanmoins, leur couplage avec des particules purement diffusantes permet une absorption quasi-parfaite (∼95%), par un effet similaire au couplage critique. Finalement, l'étude détaillée des mécanismes qui régissent le gain d'absorption en 2D a permis leur reproduction dans des systèmes 3D<br>Disordered media composed of nanoparticles are of great importance in many applications, particularly those related to energy efficiency such as radiative cooling. Understanding the light-matter interaction is therefore essential, but highly complex. Indeed, these studies often involve solving Maxwell's equations in systems made up of thousands of particles, to take account of scattering and interference phenomena. In order to reduce the ensuing numerical burden, this thesis focuses on 2D systems, with some discussion of 3D systems. In this context, the first part of this manuscript focuses on the concept of homogenization for particle systems that are small relative to the radiation wavelength and may exhibit resonances. This study highlights exotic behaviours that allow us to discuss, among other things, the link between homogenization and coherent and incoherent parts of the scattered field.The second part is dedicated to optimizing the absorption of radiation in subwavelength plates made of nanoparticles. It is shown that the use of resonant particles only results in absorption up to 70%. However, combining them with purely scattering particles results in near-perfect absorption (∼95%), through an effect similar to critical coupling. Finally, a detailed study of the mechanisms governing absorption gain in 2D has enabled them to be reproduced in 3D systems

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Burnett, P. D. S. "Radiative properties of confined plasmas." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275600.

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Francis, Peter N. "Infrared radiative properties of clouds." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302829.

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Garrett, Timothy J. "Radiative properties of arctic clouds /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/10090.

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Jiang, Jingyi. "Retrieving leaf and canopy characteristics from their radiative properties using physically based models : from laboratory to satellite observations Estimation of leaf traits from reflectance measurements: comparison between methods based on vegetation indices and several versions of the PROSPECT model a model of leaf optical properties accounting for the differences between upper and lower faces Speeding up 3D radiative transfer simulations: a physically based approximation of canopy reflectance dependency on wavelength, leaf biochemical composition and soil reflectance Effective GAI for crops is best estimated from reflectance observations as compared to GAI and LAI Optimal learning for GAI and chlorophyll estimation from 1D and 3D radiative transfer model inversion: the case of wheat and maize crops observed by Sentinel2." Thesis, Avignon, 2019. http://www.theses.fr/2019AVIG0708.

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La mesure des caractéristiques des feuilles et du couvert végétal par télédétection est un moyen efficace et non destructif d’effectuer un suivi des cultures, que ce soit pour la prise de décision dans la gestion d’itinéraires techniques an agriculture de précision ou pour le phénotypage au champ pour améliorer l'efficacité de la sélection variétale. Grâce à l’augmentation de la puissance de calcul des machines et à la disponibilité croissante d'images à haute résolution spatiale, les méthodes d’estimation peuvent maintenant bénéficier de simulations plus précises des modèles de transfert radiatif (RT) dans la végétation. L'objectif de ce travail est de proposer et d'évaluer des moyens efficaces pour estimer les caractéristiques des feuilles et du couvert végétal à partir d'observations rapprochées ou de télédétection en utilisant des modèles RT basés sur une description réaliste de la structure des feuilles et du couvert. Au niveau des feuilles, nous avons d'abord évalué la capacité des différentes versions du modèle PROSPECT à estimer des variables biochimiques comme la chlorophylle (Cab), la teneur en eau et en matière sèche. Nous avons ensuite proposé le modèle FASPECT pour décrire les différences de propriétés optiques entre les faces supérieure et inférieure des feuilles en considérant un système à quatre couches. Après avoir étalonné les coefficients d'absorption spécifiques des principaux constituants de la feuille, nous avons validé FASPECT sur 8 jeux de données. Nous avons montré que les spectres de réflectance et de transmittance des deux faces sont simulés avec une très bonne précision, et même meilleure que PROSPECT pour la face supérieure. De même, en mode inverse, les performances d'estimation de la teneur en matière sèche sont considérablement améliorées avec FASPECT par rapport à PROSPECT, et restent du même ordre de grandeur pour la chlorophylle et l’eau. Au niveau du couvert végétal, nous avons utilisé le simulateur de rendu physique réaliste LuxCoreRender pour calculer le transfert radiatif à partir d'une description 3D de l’architecture de la culture. Nous avons d’abord vérifié ses bonnes performances par comparaison aux modèles 3D les plus récents en utilisant ROMC (RAMI On Line Model Checker). Afin d’accélérer les simulations, nous avons développé une méthode qui repose sur l’utilisation d’un nombre limité de propriétés optiques du sol et des feuilles. Pour estimer les variables d'état du couvert végétal (indice de surface verte, GAI, contenu en chlorophylle du couvert (CCC) ou des feuilles (Cab), nous avons ensuite entrainé des algorithmes d’apprentissage automatique à partir de bases de données « culture spécifique » simulées avec LuxCoreRender pour le blé et le maïs et d’une base de données générique simulée avec le modèle 1D PROSAIL de transfert radiatif. Les résultats sur des simulations et sur des données in situ combinés aux images SENTINEL2 ont montré que les algorithmes spécifiques aux cultures surpassent les algorithmes génériques pour les trois variables, en particulier lorsque la structure du couvert s’éloigne de l'hypothèse 1D du milieu turbide, comme dans le cas du maïs où la structure en rang domine pendant toute une partie de la saison de croissance<br>Measuring leaf and canopy characteristics from remote sensing acquisitions is an effective and non destructive way to monitor crops both for decision making within the smart agriculture practices or for phenotyping under field conditions to improve the selection efficiency. With the advancement of computer computing power and the increasing availability of high spatial resolution images, retrieval methods can now benefit from more accurate simulations of the Radiative Transfer (RT) models within the vegetation. The objective of this work is to propose and evaluate efficient ways to retrieve leaf and canopy characteristics from close and remote sensing observations by using RT models based on a realistic description of the leaf and canopy structures. At the leaf level, we first evaluated the ability of the different versions of the PROSPECT model to estimate biochemical variables like chlorophyll (Cab), water and dry matter content. We then proposed the FASPECT model to describe the optical properties differences between the upper and lower leaf faces by considering a four-layer system. After calibrating the specific absorption coefficients of the main absorbing material, we validated FASPECT against eight measured ground datasets. We showed that FASPECT simulates accurately the reflectance and transmittance spectra of the two faces and overperforms PROSPECT for the upper face measurements. Moreover, in the inverse mode, the dry matter content estimation is significantly improved with FASPECT as compared to PROSPECT. At the canopy level, we used the physically based and unbiased rendering engine, LuxCoreRender to compute the radiative transfer from a realistic 3D description of the crop structure. We checked its good performances by comparison with the state of the art 3D RT models using the RAMI online model checker. Then, we designed a speed-up method to simulate canopy reflectance from a limited number of soil and leaf optical properties. Based on crop specific databases simulated from LuxCoreRender for wheat and maize and crop generic databases simulated from a 1D RT model, we trained some machine learning inversion algorithms to retrieve canopy state variables like Green Area Index GAI, Cab and Canopy Chlorophyll Content (CCC). Results on both simulations and in situ data combined with SENTINEL2 images showed that crop specific algorithms outperform the generic one for the three variables, especially when the canopy structure breaks the 1D turbid medium assumption such as in maize where rows are dominant during a significant part of the growing season

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Assi, Benoît [Verfasser]. "Electroweak Radiative Corrections and Effective Field Theories / Benoît Assi." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2021. http://d-nb.info/1240835590/34.

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Becker, H. "Controlling the radiative properties of conjugated polymers." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596510.

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My research has focused on the effects of reflective surfaces such as metals and dielectric stacks on the light emission from conjugated polymers. Conjugated polymers have semiconducting properties which arise from the delocalisation of electrons along the polymer backbone. These plastics are efficient light-emitters both in photoluminscence (PL) and Electroluminescence (EL). One of the unique features of these materials is their broad emission spectrum. Proximity to reflective surfaces alters the radiative rate of an emitter because of interference effects. This modification to the radiative rate is a function of the dielectric properties of the mirror, the orientation of the dipole, the distance between the dipole and the mirror, the emission angle, and the emission wavelength. In addition, non-radiative energy transfer from the emitter to excitations in a metal film efficiently quench luminescence at separations less than 60 nm. I have investigated the effects of interference and non-radiative energy transfer on the emission spectra and the PL and EL quantum efficiencies of conjugated polymer structures. The PL from thin films of conjugated polymers spin-coated onto Al and Au films, with and without SiO<SUB>2</SUB> spacer layers in between, was investigated. PL was found to be quenched close to the metal films. Experiments on double-layer LEDs where the distance between the emissive region can be controlled by altering the film thicknesses of the polymer layers extended those results from PL to EL. In addition, changes in the PL spectra and PL efficiency with increasing polymer-metal separation could be explained by computer-modelling the radiative power of oscillating dipoles. The results allowed design rules to be formulated which could improve the efficiency of LEDs, photovoltaic cells and microcavity devices in which the polymer film is sandwiched between two mirrors. Comparison between experiment and modelling revealed some information about the photophysics of conjugated polymers. Microcavities (Fabry-Perot resonators containing a light-emitter) modify the radiative rate of an emitter more strongly than single mirror devices. I have investigated the role of the dielectric properties of metals on the resonance wavelengths of a microcavity. It is shown that the metal film thickness influences the cavity resonances and that the angular dependence of the microcavity emission can be reduced exploiting specific properties of the metal.

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Liu, Xianglei. "Tailoring thermal radiative properties and enhancing near-field radiative heat flux with electromagnetic metamaterials." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54960.

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All substances above zero kelvin temperature emit fluctuating electromagnetic waves due to the random motions of charge carriers. Controlling the spectral and directional radiative properties of surfaces has wide applications in energy harvesting and thermal management. Artificial metamaterials have attracted much attention in the last decade due to their unprecedented optical and thermal properties beyond those existing in nature. This dissertation aims at tailoring radiative properties at infrared regime and enhancing the near-field radiative heat transfer by employing metamaterials. A comprehensive study is performed to investigate the extraordinary transmission, negative refraction, and tunable perfect absorption of infrared light. A polarizer is designed with an extremely high extinction ratio based on the extraordinary transmission through perforated metallic films. The extraordinary transmission of metallic gratings can be enhanced and tuned if a single layer of graphene is covered on top. Metallic metamaterials are not the unique candidate supporting exotic optical properties. Thin films of doped silicon nanowires can support negative refraction of infrared light due to the presence of hyperbolic dispersion. Long doped-silicon nanowires are found to exhibit broadband tunable perfect absorption. Besides the unique far-field properties, near-field radiative heat transfer can be mediated by metamaterials. Bringing objects with different temperatures close can enhance the radiative heat flux by orders of magnitude beyond the limit set by the Stefan-Boltzmann law. Metamaterials provide ways to make the energy transport more efficient. Very high radiative heat fluxes are shown based on carbon nanotubes, nanowires, and nanoholes using effective medium theory (EMT). The quantitative application condition of EMT is presented for metallodielectric metamaterials. Exact formulations including the scattering theory and Green’s function method are employed to investigate one- and two-dimensional gratings as well as metasurfaces when the period is not sufficiently small. New routes for enhancing near-field radiative energy transport are opened based on proposed hybridization of graphene plasmons with hyperbolic modes, hybridization of graphene plasmons with surface phonon modes, or hyperbolic graphene plasmons with open surface plasmon dispersion relation. Noncontact solid-state refrigeration is theoretically demonstrated to be feasible based on near-field thermal radiation. In addition, the investigation of near-field momentum exchange (Casimir force) between metamaterials is also conducted. Simultaneous enhancement of the near-field energy transport and suppress of the momentum exchange is theoretically achieved. A design based on repulsive Casimir force is proposed to achieve tunable stable levitation. The dissertation helps to understand the fundamental radiative energy transport and momentum exchange of metamaterials, and has significant impacts on practical applications such as design of nanoscale thermal and optical devices, local thermal management, thermal imaging beyond the diffraction limit, and thermophotovoltaic energy harvesting.

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Bourgeois, C. Saskia. "The radiative properties of snow at Summit, Greenland /." Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16758.

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Libri sul tema "Radiative and effective properties"

Thermal radiative transfer and properties. Wiley, 1992.

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Wu, Xiaohu. Thermal Radiative Properties of Uniaxial Anisotropic Materials and Their Manipulations. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7823-6.

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R, Guenther, and United States. National Aeronautics and Space Administration., eds. Measurement of the radiative properties of gas and oil flames. National Aeronautics and Space Administration, 1988.

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Kachanov, Mark, and Igor Sevostianov, eds. Effective Properties of Heterogeneous Materials. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5715-8.

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Kachanov, Mark. Effective Properties of Heterogeneous Materials. Springer Netherlands, 2013.

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Effective medium theory: Principles and applications. Clarendon Press, 1999.

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United States. National Aeronautics and Space Administration., ed. Study of the radiative properties of inhomogeneous stratocumulus clouds: A thesis ... National Aeronautics and Space Administration, 1996.

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Sasse, Christian. Bestimmung der optischen Eigenschaften von Partikeln fur solarbeheizte Wirbelschichten. DLR, 1992.

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Yen, Chien-Cheng. Studies of the radiative properties of high temperature ceramic fibre insulation materials. University of Manchester, 1994.

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Titanium dioxide: Production, properties and effective usage. 2nd ed. Vincentz Network, 2013.

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Capitoli di libri sul tema "Radiative and effective properties"

Wang, Chengmeng, Liujun Xu, Jun Wang, and Shuai Yang. "Fundamental Methods and Design Paradigm for Omnithermotics." In Diffusionics. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0487-3_13.

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AbstractThis chapter offers a comprehensive exploration into the realm of thermal metamaterials, emphasizing their transformative potential in regulating the three primary modes of heat transfer: conduction, convection, and radiation. The foundation of this exploration is rooted in the theory of transformation omnithermotics, which has been instrumental in unifying these heat transfer modes. The article delves into various functional designs, including omnithermal metamaterials capable of thermal cloaking, concentration, and rotation. The effective medium theory further broadens the scope, allowing for the simultaneous manipulation of the three heat transfer modes. A notable highlight is the introduction of omnithermal restructurable metasurfaces, which exhibit dual properties in both infrared and visible light spectrums. Additionally, this chapter touches upon other artificially designed structures, such as radiative cooling and engineered cellular solids, drawing parallels with natural counterparts like wood and bone. The BCC lattice structure, in particular, is spotlighted for its unique thermal and mechanical properties, making it a promising candidate for future applications. The culmination of these findings underscores the vast potential of thermal metamaterials in diverse applications, from energy efficiency to aerospace engineering.

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Heisig, Lisa-Marie, Katrin Markuske, Rhena Wulf, and Tobias Michael Fieback. "Characterization of Heat Transport and Diffusion Processes During Metal Melt Filtration." In Multifunctional Ceramic Filter Systems for Metal Melt Filtration. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_14.

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AbstractThis chapter contains a summary of thermodynamic investigations of ceramic filters, metal melts and their interaction, which can serve as a basis for the optimization of the filters as well as the casting and metal melt filtration process. First, the thermophysical properties of two different filter base materials are briefly discussed. Subsequently, after demonstrating measurement conditions and parameters, the effective thermal conductivities of filters with varying pore size, porosity and material measured by the Transient-Plane-Source method at temperatures up to 700 °C are presented. The experimental determination of radiative properties of the filters using a Fourier-transform infrared spectrometer with an external integrating sphere was compared to simple predictive methods. Finally, after performing experiments with air, a measurement section was created and further developed to determine the volumetric heat transfer coefficient during metal melt filtration. The first results obtained with aluminum melt are presented.In addition to the knowledge of heat transport processes, the understanding of the sorption and diffusion behavior of various gases in metal melts is important. Therefore, a thermogravimetric apparatus, which enables the direct determination of the mass changes caused by (ab-)sorption using a high-precision magnetic suspension balance, was modified especially for this measurement task.

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Shevelko, Viatcheslav P. "Radiative Characteristics." In Atoms and Their Spectroscopic Properties. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-662-03434-7_4.

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Frisch, Hélène. "Asymptotic Properties of the Scattering Kernel K(τ)." In Radiative Transfer. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95247-1_19.

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Zhang, Zhuomin M. "Radiative Properties of Nanomaterials." In Nano/Microscale Heat Transfer. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45039-7_9.

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Solovjov, Vladimir P., Brent W. Webb, and Frederic Andre. "Radiative Properties of Gases." In Handbook of Thermal Science and Engineering. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-26695-4_59.

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Vaillon, Rodolphe. "Radiative Properties of Particles." In Handbook of Thermal Science and Engineering. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-26695-4_60.

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Howell, John R., M. Pinar Mengüç, Kyle Daun, and Robert Siegel. "Radiative Properties at Interfaces." In Thermal Radiation Heat Transfer. CRC Press, 2020. http://dx.doi.org/10.1201/9780429327308-2.

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Vaillon, Rodolphe. "Radiative Properties of Particles." In Handbook of Thermal Science and Engineering. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-32003-8_60-1.

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Atti di convegni sul tema "Radiative and effective properties"

Banerjee, Ayan, Alexandre Martin, and Savio J. Poovathingal. "Estimating Effective Radiative Properties and In-Depth Radiative Heating of Porous Ablators." In AIAA SCITECH 2022 Forum. American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-1640.

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Navid, Ashcon, and Laurent Pilon. "EFFECTIVE OPTICAL PROPERTIES OF ABSORBING NANOCOMPOSITE THIN FILMS FOR TE AND TM POLARIZATION." In RADIATIVE TRANSFER - V. Proceedings of the Fifth International Symposium on Radiative Transfer. Begellhouse, 2007. http://dx.doi.org/10.1615/ichmt.2007.radtransfproc.300.

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YUEN, W., E. TAKARA, and S. LEE. "Evaluation of effective radiative properties of fibrous composite materials." In 27th Thermophysics Conference. American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-2893.

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Moncet, J. L., and S. A. Clough. "Retrieval of Effective Cloud Radiative Properties from Ground Based Spectral Measurements." In Optical Remote Sensing of the Atmosphere. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/orsa.1997.othc.4.

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A fast and numerically accurate model for monochromatic radiative transfer in scattering atmospheres has been developed to extend the capabilities of the existing LBLRTM line-by-line model [Clough et al., 1992] to the treatment of clouds and aerosols. The algorithm is based on the adding-doubling method and is specifically designed to perform radiance calculations in both the thermal and solar regimes using any specified number of computational streams. The efficient implementation of the adding-doubling scheme makes it possible to use the multiple-scattering algorithm in retrieval applications, an essential requirement for the intended use of the algorithm in atmospheric validation studies. The algorithm is applied to daytime observations of water clouds from the ground-based high spectral resolution Atmospheric Emitted Radiance Interferometer (AERI) [Smith et al., 1995]. Cloud particle size and density, and cloud fraction are retrieved from the spectral measurements in the 520-1500 cm-1 and 1800-3020 cm-1 bands. An initial assessment is made of the spectral information content of the AERI measurements for water cloud properties, and of the quality of the spectral fits obtainable with those three free parameters in the two bands.

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Chen, Y. B., Z. M. Zhang, and P. J. Timans. "Radiative Properties of Pattered Wafers With Linewidth Below 100 nm." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82418.

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Temperature nonuniformity is a critical problem in rapid thermal processing (RTP) of wafers because it leads to uneven diffusion of implanted dopants and introduces thermal stress that can produce defects. One cause of the problem is nonuniform absorption of thermal radiation, especially in patterned wafers, where the optical properties vary across the surface of the wafer. Recent developments in RTP have lead to the use of millisecond-duration heating cycles, where light with very high power density is used to heat the surface of the wafer. Pattern effects are especially important here, because there is very little time for thermal diffusion to even out temperature distributions during the heating cycle. There have been very few studies on the radiative properties of patterned wafers, especially for the structures expected to be used on advanced semiconductor devices. The feature size is already below 100 nm and is comparable or smaller than the wavelengths of radiation (200–1000 nm) emitted by the flash-lamps typically used for millisecond processing. Hence, this work is devoted to a parametric numerical study of the radiative properties of patterned wafers with the smallest dimension down to 30 nm. The effects of wavelength, wave polarization, and angle of incidence on selected periodically patterned wafers are presented. The methods include the rigorous coupled wave analysis (RCWA) and the effective medium approach (EMA). RCWA is used to obtain exact solutions of Maxwell’s equations, and EMA is used to approximate the periodic structures as a planar multilayer structure with an effective dielectric function. This study provides an assessment of the applicability of EMA for simulations of radiative properties of patterned wafers.

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Travis, Rebekah, and Karen Son. "Cost Effective Measurement of Surface Radiative Properties for Simulation Uncertainty Quantification (UQ) Analysis." In Proposed for presentation at the ASME International Mechanical Engineering Congree and Exposition - Undergraduate Expo held November 1-5, 2021 in virtual, virtual virtual. US DOE, 2021. http://dx.doi.org/10.2172/1882329.

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Chen, Y. B., B. J. Lee, and Z. M. Zhang. "Infrared Radiative Properties of Submicron Metallic Slit Arrays." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41268.

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Submicron metallic slit arrays with different geometry were designed and fabricated on silicon substrates. Their infrared radiative properties (transmittance, reflectance, and absorptance) were investigated both experimentally and theoretically. The normal transmittance of three fabricated Au slit arrays was measured at wavelengths between 2 and 15 μm using a Fourier-transform infrared spectrometer. The experiment results were compared with the values calculated from the rigorous coupled-wave analysis. The applicability of the effective medium theory for modeling radiative properties was also examined. The agreement between the measurement and modeling results demonstrates the feasibility of quantitative tuning of the radiative properties by employing periodic micro/nanostructures.

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Guerra, Timothee, Inigo Gonzalez de Arrieta, Olivier Rozenbaum, and Cedric Blanchard. "EFFECTIVE PROPERTIES OF RESONANT NANOPARTICLE SUSPENSIONS: IMPACT OF THE ELEMENTARY VOLUME SHAPE." In Proceedings of the 10th International Symposium on Radiative Transfer, RAD-23 Thessaloniki, Greece, 12–16 June 2023. Begellhouse, 2023. http://dx.doi.org/10.1615/rad-23.200.

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Braun, Matt, and Laurent Pilon. "Effective Optical Properties of Nanoporous Silicon." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72643.

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Nanoporous materials consist of nanosize voids embedded in a solid matrix. The pores can be closed or open and have various shapes and sizes. Their applications range from optical and optoelectronics devices to biosensors. In order to effectively utilize and characterize nanoporous media for these various applications, models that describe their effective optical properties are necessary. Numerous effective medium models have been proposed. However, validations of these models against experimental data are often contradictory and inconclusive. This issue was numerically investigated by solving the two-dimensional Maxwell’s equations in absorbing nanoporous silicon thin-films. All interfaces are assumed to be optically smooth and characteristic pore size is much smaller than the wavelength of incident radiation so electromagnetic wave scattering by pores can be safely neglected. The envelope method was then used to retrieve the effective index of refraction and absorption index from the computed transmittance. The numerical results agree very well for both the index of refraction and the absorption index with a recent model obtained by applying the Volume Averaging Theory (VAT) to the Maxwell’s equations. However, commonly used models such as the Maxwell-Garnett, Bruggeman, parallel, and series models systematically and sometimes significantly underpredict the numerical results.

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Rousseau, Benoit, Hector Gomart, Domingos De Sousa Meneses, and Patrick Echegut. "Material Parameters Influencing the Radiative Properties of Heterogeneous Optically Thick Oxide Ceramics." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88574.

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In this work is described a hybrid numerical code aiming to retrieve the thermal radiative properties of opaque heterogeneous coatings. The code is based on the combination of a Monte Carlo Ray Tracing (MCRT) program and of the use of the Effective Medium Approximation (EMA). This hybrid code is able to takes account for the surface roughness, the internal porosity and the chemical composition of a given layer. The solid part of a coating is composed of a conducting oxide which contents excess oxygen (δ ∼ 0.1–0.2). Due to δ and to their thicknesses (&gt; 2 μm), the coatings are opaque for the spectral range going from the far infrared range to the visible range. For each layers, their normal spectral emissivity have been measured by infrared spectrometry (T ∼1000K). The comparison of the numerical spectra to the experimental ones permits the discussion of the effects of both the surface roughness, and the internal porosity on the emissivity spectra.

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Rapporti di organizzazioni sul tema "Radiative and effective properties"

Michels, H. H. Radiative Properties of UO+. Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada214983.

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Solomon, P. R., and J. R. Markham. Radiative properties of ash and slag. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/7152112.

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Solomon, P. R., and J. R. Markham. Radiative properties of ash and slag. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/7169639.

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Solomon, P. R., and J. R. Markham. Radiative properties of ash and slag. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/7249623.

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Solomon, P. R., and J. R. Markham. Radiative properties of ash and slag. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/7008009.

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Solomon, P. R., J. R. Markham, P. E. Best, and Zhen-Zhong Yu. Radiative properties of ash and slag. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/7054651.

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Weisheit, J. C. Radiative properties of strongly magnetized plasmas. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/6546114.

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Melnikov, Kirill. Radiative Corrections to the Casimir Force and Effective Field Theories. Office of Scientific and Technical Information (OSTI), 2001. http://dx.doi.org/10.2172/784966.

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Zhang, Zhuomin. Tailoring Thermal Radiative Properties with Doped-Silicon Nanowires. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1376836.

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Solomon, P. R., J. R. Markham, P. E. Best, and Zhen-Zhong Yu. Radiative properties of ash and slag. Final report. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/10122744.

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