نتایج جستجو برای: thermal emissivity
تعداد نتایج: 219051 فیلتر نتایج به سال:
This study compared surface emissivity and radiometric temperature retrievals derived from data collected with the MODerate resolution Imaging Spectroradiometer (MODIS) and Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) sensors, onboard the NASA’s Earth Observation System (EOS)-TERRA satellite. Two study sites were selected: a semi-arid area located in northern Chihuahuan de...
There has been a growing interest in thermal management materials due to the prevailing energy challenges and unfulfilled needs for thermal insulation applications. We demonstrate the exceptional thermal management capabilities of a large-scale, hierarchal alignment of cellulose nanofibrils directly fabricated from wood, hereafter referred to as nanowood. Nanowood exhibits anisotropic thermal p...
A methodology for performing characterization of Plastic Ball Grid Array (PBGA) packages via Infrared Thermography (IRT) was established. The thermal performance of various assemblies was characterized using IRT in conjunction with analytical methods to determine the individual contributions of the PBGA package and of the printed wiring board. Accuracy and repeatability of temperature measureme...
Thermal and mechanical material properties determine comet evolution and even solar system formation because comets are considered remnant volatile-rich planetesimals. Using data from the Multipurpose Sensors for Surface and Sub-Surface Science (MUPUS) instrument package gathered at the Philae landing site Abydos on comet 67P/Churyumov-Gerasimenko, we found the diurnal temperature to vary betwe...
The temperature stability of optical reference cavities is significant in state-of-the-art ultra-stable narrow-linewidth laser systems. In this paper, the thermal time constant and thermal sensitivity of reference cavities are analyzed when reference cavities respond to environmental perturbations via heat transfer of thermal conduction and thermal radiation separately. The analysis as well as ...
A numerical method to identify thermal conductivity from time history of one-dimensional temperature variations in thermal unsteady-state is proposed. The numerical method considers the change of specific heat and thermal conductivity with respect to temperature. Fire test of reinforced concrete (RC) columns was conducted using a standard fire to obtain time history of temperature variations in...
The uncertainty of emissivity has a major effect on the accuracy pyrometer in billet temperature measurement. In order to eliminate influence emissivity, we place reflector with two apertures at front pyrometer. are used measure intrinsic radiation and approximate blackbody billet. is collected by infrared dual-band detectors Then, real-time can be measured no assumptions, so eliminated. additi...
Proper selections of microwave-transmitting thermal control materials play key roles in the orbit operations aerospace microwave detectors. Currently, white paint and germanium-coated polyimide film are common choices for control, which have been extensively studied from perspective material compositions, ignoring influence micro-nano structure on surface material. Inspired by Saharan silver an...
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