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S. Chudzik 《Opto-Electronics Review》2012,20(1):40-46
The article presents the results of research developing methods for determining the coefficient of thermal diffusivity of
thermal insulating material. This method applies a periodic heating as an excitation and an infrared camera is used to measure
the temperature distribution on the surface of tested material. In simulation study, the usefulness of known analytical solution
of the inverse problem was examined using a three-dimensional model of the phenomenon of heat diffusion in the sample of tested
material. To solve the coefficient inverse problem, an approach using artificial neural network is proposed. The measurements
were performed on an experimental setup equipped with a ThermaCAM PM 595 infrared camera and frame grabber. The experiment
allowed to verify the chosen 3D model of heat diffusion phenomenon and to determine suitability of the proposed test method. 相似文献
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MP Janawadkar R Baskaran R Nagendran K Gireesan N Harishkumar Rita Saha L S Vaidhyanathan J Jayapandian Y Hariharan TS Radhakrishnan 《Pramana》2002,58(5-6):1159-1164
A program has been developed and initiated at the Indira Gandhi Centre for Atomic Research (IGCAR) for the utilization of
SQUID sensors in various application areas. DC SQUID sensors based on Nb-AlO
x
-Nb Josephson junctions have been designed and developed inhouse along with associated flux-locked loop (FLL) electronics.
A compact low field SQUID magnetometer insertible in a liquid helium storage dewar has also been developed inhouse and is
in use. Efforts to build a high field SQUID magnetometer, SQUID-DAC system, are in progress. A planar gradiometric DC SQUID
sensor for non-destructive evaluation (NDE) application to be used in relatively unshielded environment has been designed
and developed. An easily portable NDE cryostat with a small lift-off distance, to be used in external locations has been designed
and tested. The magnetic field produced by a given two-dimensional current density distribution is inverted using the Fourier
transform technique. 相似文献
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MP Blencowe 《Contemporary Physics》2013,54(4):249-264
Nanoelectromechanical systems (NEMS) are nano-to-micrometer scale mechanical resonators coupled to electronic devices of similar dimensions. NEMS show promise for fast, ultrasensitive force microscopy and for deepening our understanding of how classical dynamics arises by approximation to quantum dynamics. This article begins with a survey of NEMS and then describes certain aspects of their classical dynamics. In particular, we show that for weak coupling the action of the electronic device on the mechanical resonator can be effectively that of a thermal bath, this despite the device being a driven, far-from-equilibrium system. 相似文献