In this paper, we demonstrate terahertz imaging of banknote anti-counterfeiting labels by using the THz-TDS confocal imaging system built in our lab. With help of this system, spatial resolution is significantly impro...
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In this paper, we demonstrate terahertz imaging of banknote anti-counterfeiting labels by using the THz-TDS confocal imaging system built in our lab. With help of this system, spatial resolution is significantly improved and detail Characters of the anti-counterfeiting labels can be identified. Areas of the multiple overlapping banknotes papers with different number of layers are imaged and distinguished by measuring the time delay and absorption of the THz pulse that transmits through banknotes papers. This technology provides a contactless and nondestructive and high spatial resolution method for screening of banknotes, compared with the conventional THz imaging system.
In this work, we demonstrate a Hydrogen-terminated (H-terminated) diamond FET with CeB6/Al2O3 materials. The CeB6 and Al2O3 film have been deposited by electron beam evaporation and atomic layer deposition technique. ...
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A calculation model of the thermal stresses in a microstructure fabricated by multilayer thin films was established depending on the processing steps and it was verified by Stoney's equation under the same conditi...
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A calculation model of the thermal stresses in a microstructure fabricated by multilayer thin films was established depending on the processing steps and it was verified by Stoney's equation under the same conditions. Furthermore, it was applied to calculate the deformation of a micro-cantilever fabricated by multilayer thin films under residual stresses. The calculated results were compared with the experimental results to show that their difference is less than 10%. Therefore, the model is applicable and can provide a theory foundation for designing and optimizing of the microstructure fabricated by multilayer films.
Global navigation satellite system plays an important role in military and civil fields, providing global positioning, navigation and timing services in real time. Unfortunately, the services provided by single conste...
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Global navigation satellite system plays an important role in military and civil fields, providing global positioning, navigation and timing services in real time. Unfortunately, the services provided by single conste...
Global navigation satellite system plays an important role in military and civil fields, providing global positioning, navigation and timing services in real time. Unfortunately, the services provided by single constellation or double constellations cannot meet the requirements of high-level navigation, and there are still some problems such as low positioning accuracy and low number of visible satellites at specific circumstances to be solved. In this paper, multi-GNSSs are constructed and their global positioning performance is analyzed with respect to static and dynamic users. Results show that with more constellations, the position dilution of precision is decreased, and the number of visible satellites and the positioning accuracy are improved, which reveals that compared with single constellation or double constellations, multi-GNSSs can obviously improve the positioning performance. The methodology proposed can serve as a technical reference for national integrated PNT systems.
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