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A new approach is introduced for wireless detection of electromagnetic signals generated at low frequencies on macula by light pulses. The signal detection is based on a resonant condition created externally and no part of the device touches the patient. Since most biological signals are excited at low frequencies, the proposed method will be applicable to other wireless detection systems including...
In this study, a multiple fans system with a piezoelectric actuator (MFPA) was integrated with a vapor chamber. The integrated system was embedded in a micro-computer for its thermal management. The MFPA utilized magnetic repulsive force to transfer power from the piezoelectric actuator to the adjacent passive fans. Models with different fan length, fan pitch and the number of the fans were developed...
The main focus of this paper is on system identification of an active magnetic bearing system (AMB) using genetic algorithm (GA) for optimal controller design purpose. In the first step, an analytical model of the system is derived using principle of physics and taking into account both the rigid body and bending body modes of the system. In the next step, as AMB system is inherently open-loop unstable,...
This paper presents a new method to improve isolation between two loop antennas with absorber cells exhibiting negative permittivity and permeability at the aimed frequency of 2.45 GHz. The metamaterial (MTM) unit cell was constructed by two open complimentary split ring resonator (OCSRR) and a split ring resonator (SRR) arrangement. The proposed antenna structures were composed of two loop antennas...
This paper presents a compact double negative metamaterial (MTM) absorber unit cell four-element arrayed electric-LC (ELC) resonators. Overall size of the proposed unit cell is 9mm × 9mm × 2mm. The proposed four-element arrayed ELC resonator where the external magnetic field is normal to the plane of the ELC resonator substrate, and the electric field is parallel to the capacitor plate exhibit a negative...
Nanoantenna using mechanical resonance vibration is made from an indium tin oxide (ITO) coated vertically aligned nanorod array. Only this structure works as a radio with demodulator without any electrical circuit using field emission phenomenon. A top-down fabrication method of an ITO coated nanorod array is proposed using a modified UV lithography. The received radio frequency and the resonance...
This paper presents a four-mask fabrication process of lateral nanoelectromechanical (NEM) electrostatic actuators based on spacer technology. Critical dimensions of the actuators, i.e., the beam width and the gap size between the movable and fixed electrodes can be made smaller than the lithographic resolution by creating nitride spacers on an oxide hardmask followed by selective etching of the oxide...
The design, fabrication and characterization of an electrostatic-type bi-axial MEMS scanning mirror operating with inter-digitated comb fingers are presented. The effect of comb offset on device actuation is examined. In addition to standard designs with and without comb offset, a novel asymmetric mirror plate was designed to introduce an imbalance. It was found that all the three designs can be actuated...
This study presents a new fabrication method for high frequency nanomechanical resonators by utilizing carbon layers with embedded single walled carbon-nanotube layers. The carbon layers, fabricated by pyrolysis of photo- or electron beam resists, showed low-density and moderate Young's modulus which is suitable to sensitive nanodevices. The carbon-nanotube layers underneath carbon layers enhanced...
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