Room-temperature continuous-wave operation under optical pumping was demonstrated using GaInAsP/InP membrane distributed feedback (DFB) lasers directly bonded on a silicon-on-insulator (SOI) substrate formed with a rib-waveguide structure. A threshold pump power of 11.3 mW and a submode suppression ratio of 29 dB were obtained for a cavity length of 140 µm and a stripe width of 1.5 µm. Light output was obtained through a 500 µm-long SOI waveguide.
Bearing faults account for a large majority of the faults in a three-phase induction motor. Recently, many research activities were focused on the diagnosis of bearing faults by motor current signature analysis. However, the effective frequency band is not fully understood in terms of the diagnosis of the bearing fault. Moreover, the temporal change in motor stator current spectrum with faulty bearing has not been sufficiently investigated. The purpose of this paper is to clarify the characteristic frequency band and to evaluate the temporal change in the power spectral density of stator current by using powder contaminated bearing before complete halt of the motor. Experiments were performed with normal and powder contaminated bearings in the induction motor. The diagnosis technique for the powder contaminated bearing is discussed based on the experimental results.
We discuss a single bubble, generated by a pulsed discharge in liquids, in which reactive plasmas interact with gases and liquids. Double-pulsed microdischarges with variable time intervals were used. The first microdischarge was used to generate the bubble and the second one was used to create plasmas in it, which worked as a microcavity for plasma processing. The bubble remained for a period of 400-600 µs, which was affected by discharge energy. The electrode erosion caused by the discharge in or without the bubble was characterized.
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