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This paper employs a numerical method combining the differential transformation method and the finite difference method to study the bifurcation behavior of a rigid rotor supported by a micro gas bearing system. The numerical results reveal a complex dynamic behavior comprising periodic, sub-harmonic, and quasi-periodic responses of the rotor center. Furthermore, the results reveal the changes which...
A 29-GHz low phase noise differential voltage controlled oscillator (VCO) using 2-mum AlGaAs/GaAs HBT process is presented in this paper. A common-emitter (CE) topology with a capacitive feedback is utilized to the circuit design. This circuit demonstrates a measured phase noise of -112 dBc/Hz at 1-MHz offset frequency, a tuning range of 0.55 GHz and an output power of higher than 1 dBm.
This paper performs a qualitative analysis of the surface energy of copper (Cu), aluminum (Al), carbon steel (S45C) and alloy steel (SKD11) by analyzing the variation in the resonant frequency of the cantilever beam (Si3N4 ) of an atomic force microscope following repeated contacts with the specimen surface. In a pure material (Cu, Al and S45C), it is found that the adhesive mass on the tip of the...
This paper presents the design and fabrication of an array-type bio-chip with a novel 3D electrode structure for gene delivery. The bio-chip enables the processes of gene delivery and cell culturing to be performed in a single device. The genes are introduced into the host cell via a process of electroporation induced by the application of a transient electric field to the electrodes of the bio-chip...
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