Results 21 to 30 of about 7,697,292 (326)

THE MAN BEHIND THE CURTAIN: X-RAYS DRIVE THE UV THROUGH NIR VARIABILITY IN THE 2013 ACTIVE GALACTIC NUCLEUS OUTBURST IN NGC 2617 [PDF]

, 2013
After the All-Sky Automated Survey for SuperNovae discovered a significant brightening of the inner region of NGC 2617, we began a ∼70 day photometric and spectroscopic monitoring campaign from the X-ray through near-infrared (NIR) wavelengths. We report
B. Shappee, J. Prieto, D. Grupe, C. Kochanek, K. Stanek, G. D. Rosa, S. Mathur, Y. Zu, B. Peterson, R. Pogge, S. Komossa, M. Im, J. Jencson, T. Holoien, U. Basu, J. Beacom, D. Szczygieł, J. Brimacombe, S. Adams, A. Campillay, Changsu Choi, C. Contreras, M. Dietrich, M. Dubberley, M. Elphick, S. Foale, M. Giustini, C. González, E. Hawkins, D. Howell, D. Howell, E. Hsiao, M. Koss, K. Leighly, N. Morrell, D. Mudd, D. Mullins, J. Nugent, J. Parrent, M. Phillips, G. Pojmański, W. Rosing, R. Ross, D. Sand, D. Terndrup, S. Valenti, S. Valenti, Z. Walker, Y. Yoon   +48 more
semanticscholar   +1 more source

Ionization and heating by X-rays and cosmic rays*

EPJ Web of Conferences, 2015
High-energy radiation from the central T Tauri and protostars plays an important role in shaping protoplanetary disks and influences their evolution. Such radiation, in particular X-rays and extreme-ultraviolet (EUV) radiation, is predominantly generated
Güdel Manuel
doaj   +1 more source

Portable X-rays–A new era?

IPEM-Translation, 2022
This paper reports learning points from a small pilot study using a portable diagnostic X-ray set to radiograph patients in novel settings such as the patient home or care home.
Deborah Henderson, Stuart Mark, David Rawlings, Kevin Robson   +3 more
doaj   +1 more source

Evaluation of a computer-aided method for measuring the Cobb angle on chest X-rays

European spine journal, 2019
To automatically measure the Cobb angle and diagnose scoliosis on chest X-rays, a computer-aided method was proposed and the reliability and accuracy were evaluated.
Yaling Pan, Qiaoran Chen, Tongtong Chen, Hanqi Wang, Xiaolei Zhu, Zhihui Fang, Yong Lu   +6 more
semanticscholar   +1 more source

Reionization by Hard Photons: I. X-rays from the First Star Clusters [PDF]

, 2001
Observations of the Ly-alpha forest at z~3 reveal an average metallicity Z~0.01 Z_solar. The high-redshift supernovae that polluted the IGM also accelerated relativistic electrons.
Oh, S. Peng
core   +2 more sources

X-rays from Hot Subdwarfs [PDF]

, 2015
Thanks to the high sensitivity of the instruments on board the XMM-Newton and Chandra satellites, it has become possible to explore the properties of the X-ray emission from hot subdwarfs.
La Palombara, Nicola, Mereghetti, Sandro
core   +3 more sources

X-ray-Induced Heating in the Vicinity of the X-ray Interaction Point

Applied Sciences, 2023
When X-rays pass through a material, radiation damage occurs, and heat is generated at the X-ray interaction point, which can then be transferred around the X-ray irradiation site. This X-ray-induced heat transfer can affect the temperature of the sample
Jangwoo Kim, Ki Hyun Nam
doaj   +1 more source

Internet hand x-rays: A comparison of joint space narrowing and erosion scores (Sharp/Genant) of plain versus digitized x-rays in rheumatoid arthritis patients

BMC Musculoskeletal Disorders, 2002
Background The objective of the study is to examine the reliability of erosion and joint space narrowing scores derived from hand x-rays posted on the Internet compared to scores derived from original plain x-rays.
Watson Margaret M, Cabarrus Luis P, Montgomery Gregory P, Arbillaga Hector O, Martin Liam, Edworthy Steven M   +5 more
doaj   +1 more source

Single shot diffraction of picosecond 8.7-keV x-ray pulses

Physical Review Special Topics. Accelerators and Beams, 2012
We demonstrate multiphoton, single shot diffraction images of x rays produced by inverse Compton scattering a high-power CO_{2} laser from a relativistic electron beam, creating a pulse of 8.7 keV x rays.
F. H. O’Shea, O. Williams, G. Andonian, S. Barber, Y. Sakai, J. B. Rosenzweig, I. Pogorelsky, M. Fedurin, K. Kusche, V. Yakimenko   +9 more
doaj   +1 more source

Pulmonary abnormality screening on chest x-rays from different machine specifications: a generalized AI-based image manipulation pipeline

European Radiology Experimental, 2023
Background Chest x-ray is commonly used for pulmonary abnormality screening. However, since the image characteristics of x-rays highly depend on the machine specifications, an artificial intelligence (AI) model developed for specific equipment usually ...
Heejun Shin, Taehee Kim, Juhyung Park, Hruthvik Raj, Muhammad Shahid Jabbar, Zeleke Desalegn Abebaw, Jongho Lee, Cong Cung Van, Hyungjin Kim, Dongmyung Shin   +9 more
doaj   +1 more source