Results 81 to 90 of about 93,835 (387)
Calibrating Mg ii–based Black Hole Mass Estimators with Hβ Reverberation Measurements
Astrophysical Journal, 2019 We present the new calibration of black hole mass ( ) estimators based on the Mg ii λ2798 broad emission line using the Hβ reverberation-mapped (RM) sample of 31 active galactic nuclei (AGNs) that have high-quality UV spectra.
Hyeonguk Bahk, J. Woo, Daeseong Park
semanticscholar +1 more source
Study on Doppler characteristics of underwater bistatic reverberation [PDF]
MATEC Web of Conferences, 2019 Active sonar has two typical types of geometry configuration respectively named monostatic and bistatic like a radar system. In the monostatic scenario, co-located underwater transducers transmit and receive sound energy, while in a bistatic situation ...
Wang Fangyong +2 more
doaj +1 more source
Estimation of the Area of a Reverberant Plate Using Average Reverberation Properties
Physics Procedia, 2015 This paper aims to present an original method for the estimation of the area of thin plates of arbitrary geometrical shapes. This method relies on the acquisition and ensemble processing of reverberated elastic signals on few sensors. The acoustical Green's function in a reverberant solid medium is modeled by a nonstationary random process based on the
Achdjian, Hossep +3 more
openaire +4 more sources
Spatial Reverberation and Dereverberation using an Acoustic Multiple-Input Multiple-Output System [PDF]
J. Audio Eng. Soc, vol. 65, no. 1/2, pp. 42-55, 2017Methods are proposed for modifying the reverberation characteristics of sound fields in rooms by employing a loudspeaker with adjustable directivity, realized with a compact spherical loudspeaker array (SLA). These methods are based on minimization and maximization of clarity and direct-to-reverberant sound ratio.
arxiv +1 more source
Speech Dereverberation with A Reverberation Time Shortening Target [PDF]
arXiv, 2022 This work proposes a new learning target based on reverberation time shortening (RTS) for speech dereverberation. The learning target for dereverberation is usually set as the direct-path speech or optionally with some early reflections. This type of target suddenly truncates the reverberation, and thus it may not be suitable for network training.
arxiv +1 more source
Study of reverberation pattern and its cancellation method in shallow water [PDF]
Theoretical and Applied Mechanics, 2007 In shallow water, the primary limitation of the performance of active sonar is the reverberation that originates from volume and boundaries scattering as well as multi-path propagation. Therefore, reverberation cancelation is an important research topic
Yang Shiuh-Kuang +2 more
doaj +1 more source
, 1999 The masses and emission-line region sizes of Active Galactic Nuclei (AGNs) can be measured by ``reverberation-mapping'' (measuring the lag of the emission-line luminosity after changes in the continuum). We use tis technique to calibrate similar size and
A. Wandel +8 more
core +2 more sources
Journal of Marine Science and Engineering, 2022 Over the last two decades, low-frequency active sonar has become an attractive tool for underwater target detection. The reverberation to signal ratio (RSR) of transmitted waveforms is an important factor affecting the detection capability of low ...
Xiaobin Cui +5 more
doaj +1 more source
Common mathematical framework for stochastic reverberation models.
Journal of the Acoustical Society of America, 2019 In the field of room acoustics, it is well known that reverberation can be characterized statistically in a particular region of the time-frequency domain (after the transition time and above Schroeder's frequency). Since the 1950s, various formulas have
R. Badeau
semanticscholar +1 more source
Multi-time-scale X-ray reverberation mapping of accreting black holes [PDF]
, 2018 Accreting black holes show characteristic reflection features in their X-ray spectrum, including an iron Kα line, resulting from hard X-ray continuum photons illuminating the accretion disc. The reverberation lag resulting from the path-length difference
G. Mastroserio, A. Ingram, M. Klis
semanticscholar +1 more source