ORCID Profile
0000-0003-2324-9266
Current Organisations
Wuhan University
,
King Fahd University of Petroleum and Minerals
,
King Abdullah University of Science and Technology (KAUST)
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Publisher: American Society of Mechanical Engineers
Date: 26-08-2018
Abstract: Electrostatic micro-electro-mechanical-system (MEMS) devices show great potential in a variety of applications such as sensing and actuation however, they are hindered by their high input voltage requirement. Double resonance excitation, which activates the system’s mechanical and electrical resonances simultaneously, was recently demonstrated experimentally to alleviate this problem. In this work, we present a mathematical model, based on the Euler Bernoulli beam model coupled with a circuit model, to simulate double resonance in MEMS devices and to shed light more onto the previously published experimental data. We show good agreement between the theoretical simulation and experimental data when the electrical resonance frequency band is sufficiently high.
Publisher: Springer Science and Business Media LLC
Date: 22-01-2019
DOI: 10.1038/S41598-018-36482-1
Abstract: We demonstrate a simple and flexible technique to efficiently activate micro/nano-electromechanical systems (MEMS/NEMS) resonators at their fundamental and higher order vibration modes. The method is based on the utilization of the lified voltage across an inductor, L , of an LC tank resonant circuit to actuate the MEMS/NEMS resonator. By matching the electrical and mechanical resonances, significant litude lification is reported across the resonators terminals. We show experimentally litude lification up to twelve times, which is demonstrated to efficiently excite several vibration modes of a microplate MEMS resonator and the fundamental mode of a NEMS resonator.
Publisher: Elsevier BV
Date: 11-2018
Publisher: Wiley
Date: 21-10-2018
Publisher: MDPI AG
Date: 24-05-2019
DOI: 10.3390/RS11101231
Abstract: Wetland flooding is significant for the flora and fauna of wetlands. High temporal resolution remote sensing images are widely used for the timely mapping of wetland flooding but have a limitation of their relatively low spatial resolutions. In this study, a novel method based on random forests and spatial attraction models (RFSAM) was proposed to improve the accuracy of sub-pixel mapping of wetland flooding (SMWF) using remote sensing images. A random forests-based SMWF algorithm (RM-SMWF) was developed firstly, and a comprehensive complexity index of a mixed pixel was formulated. Then the RFSAM-SMWF method was developed. Landsat 8 Operational Land Imager (OLI) images of two wetlands of international importance included in the Ramsar List were used to evaluate RFSAM-SMWF against three other SMWF methods, and it consistently achieved more accurate sub-pixel mapping results in terms of visual and quantitative assessments in the two wetlands. The effects of the number of trees in random forests and the complexity threshold on the mapping accuracy of RFSAM-SMWF were also discussed. The results of this study improve the mapping accuracy of wetland flooding from medium-low spatial resolution remote sensing images and therefore benefit the environmental studies of wetlands.
Publisher: AIP Publishing
Date: 2018
DOI: 10.1063/1.5018321
Abstract: Achieving large signal-noise ratio using low levels of excitation signal is key requirement for practical applications of micro and nano electromechanical resonators. In this work, we introduce the double electromechanical resonance drive concept to achieve an order-of-magnitude dynamic signal lification in micro resonators. The concept relies on simultaneously activating the micro-resonator mechanical and electrical resonance frequencies. We report an input voltage lification up to 15 times for a micro-resonator when its electrical resonance is tuned to match the mechanical resonance that leads to dynamic signal lification in air (Quality factor enhancement). Furthermore, using a multi-frequency excitation technique, input voltage and vibrational lification of up to 30 times were shown for the same micro-resonator while relaxing the need to match its mechanical and electrical resonances.
Location: Saudi Arabia
Location: Saudi Arabia
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