Results 31 to 40 of about 7,633 (272)

Advanced radar absorbing ceramic-based materials for multifunctional applications in space environment [PDF]

, 2018
In this review, some results of the experimental activity carried out by the authors on advanced composite materials for space applications are reported.
Albano, M., Delfini, A., Marchetti, M., Pastore, R., Rubini, G., Santoni, F., Vricella, A.   +6 more
core   +1 more source

Reverberation Mapping and the Physics of Active Galactic Nuclei [PDF]

, 1997
Reverberation-mapping campaigns have revolutionized our understanding of AGN. They have allowed the direct determination of the broad-line region size, enabled mapping of the gas distribution around the central black hole, and are starting to resolve the
A Robinson, BM Peterson, BM Peterson, BM Peterson, BM Peterson, BM Peterson, BM Peterson, C Done, C Winge, C Winge, D Alloin, D Alloin, D Maoz, D Maoz, D Maoz, D Maoz, DM Crenshaw, E Pérez, FP Pijpers, GA Reichert, GJ Ferland, GM Stirpe, H Netzer, H Netzer, H Netzer, HL Marshall, I Wanders, I Wanders, I Wanders, J Clavel, JH Krolik, JH Krolik, K Horne, KT Korista, M Dietrich, M-H Ulrich, R Edelson, R Warwick, RD Blandford, RJ White, TE Carone, Th Boller, W Romanishin, W Welsh   +43 more
core   +2 more sources

A fast reverberation suppression method based on graph Laplacian regularization [PDF]

JASA Express Letters
Traditional low-rank and sparse decomposition methods impose a global low-rank constraint for estimating the reverberation subspace, but they face performance degradation with limited samples and require computationally expensive singular value ...
Wenbo Gou, Hong Liang, Pulin Yang
doaj   +1 more source

Mid-infrared microlensing of accretion disc and dusty torus in quasars: effects on flux ratio anomalies [PDF]

, 2013
Multiply-imaged quasars and AGNs observed in the mid-infrared (MIR) range are commonly assumed to be unaffected by the microlensing produced by the stars in their lensing galaxy.
Anguita, T., Kishimoto, M., Sluse, D., Wambsganss, J., Wucknitz, O.   +4 more
core   +1 more source

Reverberation suppression using non-negative matrix factorization to detect low-Doppler target with continuous wave active sonar

EURASIP Journal on Advances in Signal Processing, 2019
In active sonar systems, the detection of echo from targets can deteriorate due to reverberation. Detection becomes more difficult if targets have low-Doppler frequency and are located near the reverberation band, especially in an environment with low ...
Seokjin Lee, Jun-seok Lim
doaj   +1 more source

Performance Analysis of MVDR Beamformer Applied on an End-fire Microphone Array Composed of Unidirectional Microphones

Archives of Acoustics, 2021
Microphone array with minimum variance (MVDR) beamformer is a commonly used method for ambient noise suppression. Unfortunately, the performance of the MVDR beamformer is poor in a real reverberant room due to multipath wave propagation. To overcome this
Zoran ŠARIĆ, Miško SUBOTIĆ, Ružica BILIBAJKIĆ, Marko BARJAKTAROVIĆ, Nebojša ZDRAVKOVIĆ   +4 more
doaj   +1 more source

A channel-selection criterion for suppressing reverberation in cochlear implants [PDF]

The Journal of the Acoustical Society of America, 2011
Little is known about the extent to which reverberation affects speech intelligibility by cochlear implant (CI) listeners. Experiment 1 assessed CI users’ performance using Institute of Electrical and Electronics Engineers (IEEE) sentences corrupted with varying degrees of reverberation.
Kokkinakis, Kostas, Hazrati, Oldooz, Loizou, Philipos C.   +2 more
openaire   +3 more sources

UV–Optical Disk Reverberation Lags despite a Faint X-Ray Corona in the Active Galactic Nucleus Mrk 335

The Astrophysical Journal, 2023
 We present the first results from a 100-day Swift, NICER, and ground-based X-ray–UV–optical reverberation mapping campaign of the Narrow-line Seyfert 1 Mrk 335, when it was in an unprecedented low X-ray flux state.
Erin Kara, Aaron J. Barth, Edward M. Cackett, Jonathan Gelbord, John Montano, Yan-Rong Li, Lisabeth Santana, Keith Horne, William N. Alston, Douglas Buisson, Doron Chelouche, Pu Du, Andrew C. Fabian, Carina Fian, Luigi Gallo, Michael R. Goad, Dirk Grupe, Diego H. González Buitrago, Juan V. Hernández Santisteban, Shai Kaspi, Chen Hu, S. Komossa, Gerard A. Kriss, Collin Lewin, Tiffany Lewis, Michael Loewenstein, Anne Lohfink, Megan Masterson, Ian M. McHardy, Missagh Mehdipour, Jake Miller, Christos Panagiotou, Michael L. Parker, Ciro Pinto, Ron Remillard, Christopher Reynolds, Daniele Rogantini, Jian-Min Wang, Jingyi Wang, Dan Wilkins   +39 more
doaj   +1 more source

Self-shadowing Effects of Slim Accretion Disks in Active Galactic Nuclei: Diverse Appearance of the Broad-line Region

, 2014
Supermassive black holes in active galactic nuclei (AGNs) undergo a wide range of accretion rates, which lead to diversity of appearance. We consider the effects of anisotropic radiation from accretion disks on the broad-line region (BLR), from the ...
Du, P., Ho, L. C., Qiu, J., Wang, J. -M.
core   +1 more source

Speech improvement in noisy reverberant environments using virtual microphones along with proposed array geometry

EURASIP Journal on Advances in Signal Processing, 2022
This paper proposes a novel approach for improving the speech of a single speaker in noisy reverberant environments. The proposed approach is based on using a beamformer with a large number of virtual microphones with the suggested arrangement on an open
Mohammad Ebrahim Sadeghi, Hamid Sheikhzadeh, Mohammad Javad Emadi   +2 more
doaj   +1 more source