Results 21 to 30 of about 409,007 (252)

Extreme Warm Absorber variability in the Seyfert Galaxy Mrk 704 [PDF]

, 2011
In about half of Seyfert galaxies, the X-ray emission is absorbed by an optically thin, ionized medium, the so-called "Warm Absorber", whose origin and location is still a matter of debate.
A. L. Longinotti, Ajello, Bianchi, Blustin, De Rosa, E. Piconcelli, G. Malaguti, G. Matt, G. Miniutti, G. Ponti, Halpern, Kalberla, Krongold, Laha, M. Dadina, M. Guainazzi, P. O. Petrucci, Piconcelli, Proga, Reynolds, Risaliti, Risaliti, Ross, S. Bianchi, Schurch, Smith, Stirpe, V. Karas, Veron-Cetty, Wang   +29 more
core   +1 more source

Customized Inverse Design of Metamaterial Absorber Based on Target-Driven Deep Learning Method

IEEE Access, 2020
Metamaterials (MMs) have already achieved wide applications in academia and industry. The traditional design approach for MMs highly relies on full-wave numerical simulations and trial-and-error methods.
Junjie Hou, Hai Lin, Weilin Xu, Yuze Tian, You Wang, Xintong Shi, Feng Deng, Lijie Chen   +7 more
doaj   +1 more source

Silicon Particles/Black Paint Coating for Performance Enhancement of Solar Absorbers

Energies, 2021
The availability of fresh drinkable water and water security is becoming a global challenge for sustainable development. In this regard, solar stills, due to their ease in operation, installation, and utilization of direct sunlight (as thermal energy ...
Shwe Sin Han, Usman Ghafoor, Tareq Saeed, Hassan Elahi, Usman Masud, Laveet Kumar, Jeyraj Selvaraj, Muhammad Shakeel Ahmad   +7 more
doaj   +1 more source

Spatially extended absorption around the z=2.63 radio galaxy MRC 2025-218: outflow or infall? [PDF]

, 2008
We present an investigation into the absorber in front of the z=2.63 radio galaxy MRC 2025-218, using integral field spectroscopy obtained at the Very Large Telescope, and long slit spectroscopy obtained at the Keck II telescope.
A. Humphrey, Anders, Barkana, Barkana, Benson, Binette, Binette, Binette, C. De Breuck, C. Tadhunter, Carilli, Cimatti, Cimatti, Conti, Cooke, Crenshaw, Daltabuit, De Breuck, Dopita, Dopita, Dopita, Fardal, Ferruit, Fosbury, Goodrich, Haiman, Hamann, Humphrey, Humphrey, Humphrey, J. Stasielak, J. Vernet, Jarvis, Keenan, Keshet, Korista, Krause, Kurk, L. Binette, Larkin, LeFevre, M. Villar-Martín, McCarthy, McCarthy, McCarthy, Nesvadba, Oke, Pentericci, Pentericci, Pettini, R. Fosbury, Reuland, Rocca-Volmerange, Röttgering, Röttgering, S. di Serego Alighieri, S. F. Sánchez, Schaye, Seymour, Spitzer, Sánchez, van Ojik, Vernet, Villar-Martín, Villar-Martín, Villar-Martín, Weidinger, Wilman, Wilman, Wilman, Zirm   +70 more
core   +3 more sources

Reflection and refraction characteristics of a spherical acoustic black hole

Nihon Kikai Gakkai ronbunshu, 2018
Spherical Acoustic Black Hole (ABH), a kind of acoustic metamaterial, has been made in the new configuration to control three dimensional propagation of acoustic wave and its characteristics have been investigated by experiments and numerical simulations.
Koichi MORI, Kazuki FUKAYA
doaj   +1 more source

A single-layer tuneable microwave absorber using an active FSS [PDF]

, 2004
An experimental single-layer active microwave absorber in described. The absorber is a planar structure based upon the topology of a Salisbury screen, but in which the conventional resistive layer is replaced by an active frequency selective surface (FSS)
Chambers, B., Tennant, A.
core   +1 more source

Implementation of Atomically Thick Graphene and Its Derivatives in Electromagnetic Absorbers

Applied Sciences, 2019
To reduce the radar cross section at microwave frequencies, it is necessary to implement electromagnetic (EM) absorbing devices/materials to decrease the strength of reflected waves.
Jing Tian, Hongyu Shi, Haoquan Hu, Bo Chen, Yongfang Bao, Pu Tang   +5 more
doaj   +1 more source

On The Reddening in X-ray Absorbed Seyfert 1 Galaxies [PDF]

, 2000
There are several Seyfert galaxies for which there is a discrepancy between the small column of neutral hydrogen deduced from X-ray observations and the much greater column derived from the reddening of the optical/UV emission lines and continuum.
Antonucci R. R., Brandt W. N., D. M. Crenshaw, I. M. George, Komossa S., Komossa S., Komossa S., Kraemer S. B., Mezger P. G., Mundell C. G., Nelson C. H., Reynolds C. S., Reynolds C. S., Reynolds C. S., S. B. Kraemer, Snow T. P., T. J. Turner, Ulrich M.-H.   +17 more
core   +3 more sources

MCG+00-32-16: An Irregular Galaxy Close to the Lowest Redshift Absorber on the 3C 273 Line of Sight [PDF]

, 1998
MCG+00-32-16 is the galaxy closest in position-velocity space to the lowest redshift Ly$\alpha$ absorber along the line-of-sight to the quasar 3C 273.
Babul A., Bowen D. V., Bryan M. Connell, E. E. Salpeter, Efstathiou G., G. Lyle Hoffman, Garcia A. M., Jimenez R., Le Brun V., Mo H. J., Mo H. J., Nanyao Y. Lu, Petitjean P., Quinn T., Rene Fromhold‐Treu, Vedel H.   +15 more
core   +3 more sources

Research progress in broadband absorber based on artificial electromagnetic medium

Cailiao gongcheng, 2020
Artificial electromagnetic medium can effectively expand the absorption bandwidth of the absorber,which has aroused wide attention of researchers at home and abroad.
DU Hong-yan, ZHANG Zi-dong, TIAN Rui, ZHANG Wen-jin, ZHANG Jian, LIU Xin-yu, SUN Kai, FAN Run-hua   +7 more
doaj   +1 more source