Results 21 to 30 of about 1,158,243 (264)
Design of current signal frequency detecting device based on harmonic separation
Dianzi Jishu Yingyong, 2019 The frequency detection of current and voltage plays a very important role in the grid-connected control strategy. Large detection errors can cause failure of control algorithms such as phase lock, harmonic compensation and reactive power compensation ...
Han Xuelong +3 more
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Crack Detection of Timoshenko Beam Using Frequency and Frequency Response Function [PDF]
مجله مدل سازی در مهندسی, 2018 This paper presents a novel approach to detect and estimate cracks in Timoshenko Beams using frequencies and frequency response functions and extreme learning machine.
Siamak Ghadimi, Seyed Sina Kourehli
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Design of a Microwave Power Detection System in the 5G-Communication Frequency Band
Sensors, 2021 At present, the proposed microwave power detection systems cannot provide a high dynamic detection range and measurement sensitivity at the same time. Additionally, the frequency band of these detection systems cannot cover the 5G-communication frequency
Qingying Ren +5 more
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Energies, 2019 This paper presents a method for online detection of symmetrical components of arbitrarily distorted and biased three-phase input signals. This method is based on Second-Order Generalized Integrators (SOGIs), for which a new tuning based on a gradient ...
Christoph M. Hackl, Markus Landerer
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Detection of frequency modulation at large modulation frequencies [PDF]
The Journal of the Acoustical Society of America, 1978 Several studies have been made of the minimum frequency excursions Δf required for detection of frequency modulation, with modulation frequency fm. [E. Zwicker, Acustica, 2, 125–133 (1952) R. H. Kay and D. R. Matthews, J. Physiol. 225, 657–677 (1972)]. The graph of minimum Δf vs fm has a pronounced peak at large values of fm.
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Hierarchical Autoencoder Frequency Features for Stress Detection
IEEE Access, 2023 Stress has a significant negative impact on people, which has made it a primary social concern. Early stress detection is essential for effective stress management.
Radhika Kuttala +2 more
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Radio Frequency Tomography for Tunnel Detection [PDF]
IEEE Transactions on Geoscience and Remote Sensing, 2010 Radio frequency (RF) tomography is proposed to detect underground voids, such as tunnels or caches, over relatively wide areas of regard. The RF tomography approach requires a set of low-cost transmitters and receivers arbitrarily deployed on the surface of the ground or slightly buried.
Lorenzo Lo Monte +3 more
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A Three-Dimensional Reconstruction Method Based on Telecentric Epipolar Constraints
PhotonicsWhen calibrating a microscopic fringe projection profile system with a telecentric camera, the orthogonality of the camera causes an ambiguity in the positive and negative signs of its external parameters.
Qinsong Li +3 more
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Network models of frequency modulated sweep detection. [PDF]
PLoS ONE, 2014 Frequency modulated (FM) sweeps are common in species-specific vocalizations, including human speech. Auditory neurons selective for the direction and rate of frequency change in FM sweeps are present across species, but the synaptic mechanisms ...
Steven Skorheim +2 more
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GPS Multipath Detection in the Frequency Domain
CoRR, 2016 Multipath is among the major sources of errors in precise positioning using GPS and continues to be extensively studied. Two Fast Fourier Transform (FFT)-based detectors are presented in this paper as GPS multipath detection techniques. The detectors are formulated as binary hypothesis tests under the assumption that the multipath exists for a ...
Amani, Elie +5 more
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