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This paper focuses on the dynamic analysis of a novel piezo-based accelerometer with asymmetric gapped cantilever array. The accelerometer with asymmetric gapped cantilever, firstly published in Xu's work, exhibits significantly improved sensitivity. In this paper, in order to achieve wider dynamic response range, new structure of the accelerometer is proposed with asymmetric gapped cantilever array.
The vibrational mechanical properties of a graphene resonator were investigated by finite element analysis (FEA) modeling and simulation. By applying a pressure difference across the membrane, the natural frequency of the graphene sheets is changed. The resonance frequency increases with increasing pressure difference. The maximum deflection occurs at the center of graphene. As the initial tension...
Graphene sheet (GS) is a two-dimensional (2D) material with extremely favorable mass sensor properties. In this paper, a linear elastic 2D plate model is applied to study the potential of a nanoscale mass sensor on individual GS. The simulated natural frequency was compared with the results obtained from the Rayleigh's energy method. The effects of the attached mass, aspect ratio, and the layer number...
The vibrational mechanical properties of a graphene resonator were investigated by finite element analysis (FEA) modeling and simulation. By applying a pressure difference across the membrane, the natural frequency of the graphene sheets is changed. The resonance frequency increases with increasing pressure difference. The maximum deflection occurs at the center of graphene. As the initial tension...
Auscultation method has been used since the early 19th century in diagnostics of heart and lung diseases. Traditional stethoscope coupled with ears of physicians detects the heart and lung sound, and it is formed by microphone, air chamber and other infrastructures. However, some disadvantages exist in this kind of detecting tools, such as bulky size, friction noise due to hand-held, and inconvenience...
Graphene sheet (GS) is a two-dimensional (2D) material with extremely favorable mass sensor properties. In this paper, a linear elastic 2D plate model is applied to study the potential of a nanoscale mass sensor on individual GS. The simulated natural frequency was compared with the results obtained from the Rayleigh's energy method. The effects of the attached mass, aspect ratio, and the layer number...
The vibrational mechanical properties of a graphene resonator were investigated by finite element analysis (FEA) modeling and simulation. By applying a pressure difference across the membrane, the natural frequency of the graphene sheets is changed. The resonance frequency increases with increasing pressure difference. The maximum deflection occurs at the center of graphene. As the initial tension...
The vibrational mechanical properties of a graphene resonator were investigated by finite element analysis (FEA) modeling and simulation. By applying a pressure difference across the membrane, the natural frequency of the graphene sheets is changed. The resonance frequency increases with increasing pressure difference. The maximum deflection occurs at the center of graphene. As the initial tension...
We experimentally investigate modulation formats for realizing high data rate and high power sensitivity using coherent reception with low noise-figure optical preamplification. 40 Gbit/s PS-QPSK exhibits a sensitivity of 4.3 photons/bit while 100 Gbit/s PDM-QPSK exhibits a sensitivity of 5.3 photons/bit at 3.8×10−3 BER.
125µm- breath sensor with high sensitivity and rapid response was prepared by using n-type Si: Au material. Its sensitivity coefficient and time constant were 4 V.sec/L and 38 msec, respectively. Its working principle was based on anomalous resistance effect, which not only increased the sensitivity, but also reduced its time constant greatly. Its signal processing system can select the breath signals...
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