The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
P. Baranowski - One of the best experts on this subject based on the ideXlab platform.
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Spatial variability of soil Thermal Properties in cultivated fields
Soil and Tillage Research, 1996Co-Authors: B. Usowicz, J. Kossowski, P. BaranowskiAbstract:Abstract Soil Thermal Properties in the surface layers of neighbouring fields with different crops were estimated from a statistical-physical model of Thermal conductivity and mathematical formulae for heat capacity and Thermal diffusivity. Input data came from water content and bulk density measurements at points situated in the nodes of 10 m square nets covering a total of 40 × 430 m. The spatial variability of soil Thermal Properties was analysed using classical statistics and geostatistics. The results indicate a distinct impact of soil water content and bulk density on the spatial variability of soil Thermal Properties. For particular soil Thermal Properties, this impact appeared to be different and related to soil water content.
Bai Shuli - One of the best experts on this subject based on the ideXlab platform.
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Thermal Properties and characterization techniques of graphene
Advances in Mechanics, 2014Co-Authors: Bai ShuliAbstract:Graphene has attracted the attention of scientific community immediately since its discovery in 2004, and raised a research wave of carbon allotrope after the finding of carbon nanotubes. A series of research works have been carried out on graphene fabrication,characterization and possible applications. Since its appearance, most studies have been concentrated on its electric Properties, especially on the supercapacitor. Comparatively, there are fewer studies on its Thermal Properties. However, due to its extremely high Thermal conductivity and negative coefficient of Thermal expansion, as well as its value for engineering application, research on its Thermal Properties is becoming one of hot topics. In this paper,we overview the achievements in the world about Thermal Properties of graphene such as Thermal conductivity and coefficient of Thermal expansion. We are concerned with single layer and multilayer grapheme, and graphene foam. We present results obtained from experiments, theories and numerical simulations. Based on the review, we raise some existing problems, and propose possible solutions for future development.
Ajit K. Roy - One of the best experts on this subject based on the ideXlab platform.
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Thermal Properties of graphene: Fundamentals and applications
Mrs Bulletin, 2012Co-Authors: Eric Pop, Ak Roy, Vikas Varshney, Ajit K. RoyAbstract:Graphene is a two-dimensional (2D) material with over 100-fold anisotropy of heat flow between the in-plane and out-of-plane directions. High in- plane Thermal conductivity is due to covalent sp2 bonding between carbon atoms, whereas out-of-plane heat flow is limited by weak van der Waals coupling. Herein, we review the Thermal Properties of graphene, including its specific heat and Thermal conductivity (from diffusive to ballistic limits) and the influence of substrates, defects, and other atomic modifications. We also highlight practical applications in which the Thermal Properties of graphene play a role. For instance, graphene transistors and interconnects benefit from the high in-plane Thermal conductivity, up to a certain channel length. However, weak Thermal coupling with substrates implies that interfaces and contacts remain significant dissipation bottlenecks. Heat flow in graphene or graphene composites could also be tunable through a variety of means, including phonon scattering by substrates, edges or interfaces. Ultimately, the unusual Thermal Properties of graphene stem from its 2D nature, forming a rich playground for new discoveries of heat flow physics and potentially leading to novel Thermal management applications.
B. Usowicz - One of the best experts on this subject based on the ideXlab platform.
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Spatial variability of soil Thermal Properties in cultivated fields
Soil and Tillage Research, 1996Co-Authors: B. Usowicz, J. Kossowski, P. BaranowskiAbstract:Abstract Soil Thermal Properties in the surface layers of neighbouring fields with different crops were estimated from a statistical-physical model of Thermal conductivity and mathematical formulae for heat capacity and Thermal diffusivity. Input data came from water content and bulk density measurements at points situated in the nodes of 10 m square nets covering a total of 40 × 430 m. The spatial variability of soil Thermal Properties was analysed using classical statistics and geostatistics. The results indicate a distinct impact of soil water content and bulk density on the spatial variability of soil Thermal Properties. For particular soil Thermal Properties, this impact appeared to be different and related to soil water content.
R. Celorrio - One of the best experts on this subject based on the ideXlab platform.
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Degeneracy of the Thermal Properties of buried structures
Journal of Applied Physics, 2005Co-Authors: Agustín Salazar, F. Garrido, Alberto Oleaga, R. CelorrioAbstract:In Thermal wave physics the surface temperature of a material depends on the Thermal diffusivity and Thermal effusivity of the components. Therefore these Thermal Properties of buried structures are expected to be retrieved from the measurement of the surface temperature using photoThermal techniques. Then, from the constitutive equations, Thermal conductivity and specific heat of the inclusions can be calculated. In this paper we demonstrate analytically that when the Thermal Properties of the inclusions are very different from those of the matrix they are degenerate. Three kinds of inclusions have been studied: layers, cylinders, and spheres. If the transport Thermal Properties of the inclusion are much higher (much lower) than those of the matrix; only its specific heat (Thermal effusivity) can be retrieved. On the other hand, for a gas inclusion only its Thermal conductivity can be determined. PhotoThermal measurements performed on three calibrated samples containing buried cylinders confirm the theor...