A thermal imaging system that uses machine learning to disentangle the information contained in infrared images has been unveiled by researchers.
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The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation. Thermal radiation is electromagnetic radiation that most commonly includes both visible radiation (light) and infrared radiation, which is not visible to human eyes. A portion of the thermal radiation from very hot objects is easily visible to the eye.
The emissivity of a surface depends on its chemical composition and geometrical structure. Quantitatively, it is the ratio of the thermal radiation from a surface to the radiation from an ideal black surface at the same temperature as given by the Stefan–Boltzmann law. (A comparison with Planck's law is used if one is concerned with particular wavelengths of thermal radiation.) The ratio varies from 0 to 1.
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The emissivity of a surface depends on its chemical composition and geometrical structure. Quantitatively, it is the ratio of the thermal radiation from a surface to the radiation from an ideal black surface at the same temperature as given by the Stefan–Boltzmann law. (A comparison with Planck's law is used if one is concerned with particular wavelengths of thermal radiation.) The ratio varies from 0 to 1.
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Black-body radiation is the thermal electromagnetic radiation within, or surrounding, a body in thermodynamic equilibrium with its environment, emitted by a black body (an idealized opaque, non-reflective body). It has a specific, continuous spectrum of wavelengths, inversely related to intensity, that depend only on the body's temperature, which is assumed, for the sake of calculations and theory, to be uniform and constant.
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Using a scaffold made from conductive silicon nanowires, researchers have developed artificial heart tissue that they say could be readily transplanted into natural tissue.
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Tensile cracks in brittle elastic materials can spread faster than the speed of sound – and faster than the laws of classical fracture mechanics say is possible.
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A wearable ultrasound device could help detect breast cancer earlier – and thus improve survival rates.
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A jet of frozen hydrogen provides a renewable target for laser acceleration of ion beams, in a step towards a laser-driven proton therapy system.
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We used to think that plate tectonics was a pre-requisite for life. New research suggests that might not be the case after all.
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Researchers have made unexpected discoveries when observing how water flows around partially submerged spheres. This could lead to a better understanding of fluid flow in biological systems and result in better designs of ships and aircraft.
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