Topic
Sine wave
About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.
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TL;DR: A prototype system that uses an advanced data acquisition processor in combination with a personal computer (PC) to analyse surface electromyogram (EMG) signals on-line and in real-time with a high degree of standardization is described.
33 citations
TL;DR: The noise mechanism in a well-designed magnetometer is due to small-scale magnetic moments which are probably small volumes of the core material that are not oriented by the drive field as discussed by the authors.
Abstract: The noise mechanism in a well-designed magnetometer is shown to be due to small-scale magnetic moments which are probably small volumes of the core material that are not oriented by the drive field. Design developments include the sense coil radius and the development of a drive waveform which yields considerably improved performance over the commonly used sine wave drive.
32 citations
01 Jan 1999
TL;DR: In this paper, the authors studied whether the mass transport or energy transport is the proper viewpoint for internally generating waves in the extended Boussinesq equations of Nwogu (1993).
Abstract: It is studied whether the mass transport or energy transport is the proper viewpoint for internally generating waves in the extended Boussinesq equations of Nwogu (1993). The numerical solutions of the Boussinesq equations with the internal generation of sinusoidal waves show that the energy transport yields required wave energy properly while the mass transport yields wave energy different from the required one with the ratio of phase speed to energy velocity. The waves which pass through the wave generation point do not cause any numerical problems. It can be concluded that the proper viewpoint for the internal generation of waves in the hyperbolic wave equations is the energy transport rather than the mass transport.
32 citations
Patent•
28 Jan 2009TL;DR: In this article, a symmetric view matching was proposed to improve streaks and other artifacts due to the view misregistration, and sufficient spectrum separation even in a sinusoidal waveform swinging between 80 kV and 135 kV, for the simulated imaging task maximized at monochromatic energy of 75 keV.
Abstract: Fast kV-switching is a dual energy acquisition technique in computed tomography (CT) in which alternating views correspond to the low and high tube voltages. Its high temporal resolution and its suitability to a variety of source trajectories make it an attractive option for dual energy data acquisition. Its disadvantages include a one-view misregistration between the data for high and low voltages, the potentially poor spectrum separation due to the more-like a sine wave rather than the desired square wave in fast kV-switching, and the higher noise in the low voltage data because of the technical difficulty in swinging the tube current to counter the loss of x-ray production efficiency and loss of penetration at lower tube voltages. Despite the disadvantages, symmetric view matching according to the current invention substantially improves streaks and other artifacts due to the view misregistration, sufficient spectrum separation even in a sinusoidal waveform swinging between 80 kV and 135 kV, and contrast-to-noise for the simulated imaging task maximized at monochromatic energy of 75 keV.
32 citations
Patent•
25 Nov 2003
TL;DR: In this article, the authors proposed a synchronous motor driving device with rectangular wave excitation in which any excitation width between 120° and 180° inclusive is selectable and sine wave excitations can be accomplished by one piece of circuitry, and the excitation wave form can be changed in a very short time according to driving conditions (high-efficiency driving conditions, low-noise driving conditions) required for a motor to be driven.
Abstract: PROBLEM TO BE SOLVED: To provide a synchronous motor driving device wherein rectangular wave excitation in which any excitation width between 120° and 180° inclusive is selectable and sine wave excitation can be accomplished by one piece of circuitry, and the excitation wave form can be changed in a very short time according to driving conditions (high-efficiency driving conditions, low-noise driving conditions) required for a synchronous motor to be driven. SOLUTION: The synchronous motor driving device is used to drive a synchronous motor through an inverter device. The driving device comprises: an output voltage vector computing means that determines the output voltage vector outputted by the inverter device according to a command value of rotational speed; a rectangular wave exciting means that outputs voltage in rectangular waveform with any excitation width between 120° and 180° inclusive according to the output voltage vector; a sine wave exciting means that outputs voltage by sine waveform excitation according to the output voltage vector; and an excitation waveform selecting means that selects an excitation method and an excitation width according to conditions required in driving the synchronous motor. COPYRIGHT: (C)2005,JPO&NCIPI
32 citations