This paper presents an impact-induced frequency up-conversion piezoelectric energy harvester (FUC-PEH) to improve low-frequency output performance. The FUC-PEH includes a high-frequency piezoelectric ...

In this paper, an improved sensorless control method based on high-frequency square-wave signal injection of PMSM is proposed. The frequency spectrum of high-frequency current is expanded by injecting ...

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Degrees of Hearing Impairment To find out how impaired your hearing is, your doctor may order a formal hearing test also known as an audiogram. It can show the degree of your hearing loss by ...

Make sure your productions aren't too piercingHere are nine ways to make your productions sounds easier on the ear, so that your audience will want to listen to them repeatedly, and for longer. 1.