Results 111 to 120 of about 2,841,431 (249)

Constraints on the mass and radius of neutron stars from X-ray observations [PDF]

arXiv, 2015
This article gives a very brief introduction about measuring the mass and radius of neutron star from X-ray observations. The masses and radii of neutron stars can be determined from photospheric radius expansion bursts in low-mass X-ray binaries, X-ray pulse profile modeling in accreting X-ray pulsars, gravitational redshift measurement in low-mass X ...
arxiv  

Wind inhibition by X-ray irradiation in HMXBs: the influence of clumping and the final X-ray luminosity

, 2018
In wind-powered X-ray binaries, the radiatively driven stellar wind from the primary may be inhibited by the X-ray irradiation. This creates the feedback that limits the X-ray luminosity of the compact secondary.
Krticka, Jiri, Krtickova, Iva, Kubat, Jiri   +2 more
core   +1 more source

Selected annotated instance segmentation sub-volumes from a large scale CT data-set of a historic aircraft

Scientific Data
The Me 163 was a Second World War fighter airplane and is currently displayed in the Deutsches Museum in Munich, Germany. A complete computed tomography (CT) scan was obtained using a large scale industrial CT scanner to gain insights into its history ...
Roland Gruber, Nils Reims, Andreas Hempfer, Stefan Gerth, Michael Böhnel, Theobald Fuchs, Michael Salamon, Thomas Wittenberg   +7 more
doaj   +1 more source

An X-ray Imaging Study of the Stellar Population in RCW49

, 2007
We present the results of a high-resolution X-ray imaging study of the stellar population in the Galactic massive star-forming region RCW49 and its central OB association Westerlund 2.
Baraffe I., Belloni T., Berghoefer T. W., Cannon A. J., D. Baba, Dreyer J. L. E., E. B. Churchwell, E. D. Feigelson, G. P. Garmire, Gum C. S., J. Wang, K. V. Getman, Kesteven M. J. L., L. K. Townsley, M. Tamura, M. Tsujimoto, Moffat A. F. J., Morris P. W., P. S. Broos, Rodgers A. W., Siess L., T. Nagayama, van der Hucht K. A., Westerlund B., Whiteoak J. B. Z.   +24 more
core   +1 more source

Crystal structure, Hirshfeld surface analysis and DFT studies of (E)-1-(4-bromophenyl)-3-(3-fluorophenyl)prop-2-en-1-one

Acta Crystallographica Section E: Crystallographic Communications, 2019
The asymmetric unit of the title halogenated chalcone derivative, C15H10BrFO, contains two independent molecules, both adopting an s-cis configuration with respect to the C=O and C=C bonds. In the crystal, centrosymmetrically related molecules are linked
Muhamad Fikri Zaini, Ibrahim Abdul Razak, Mohamad Zahid Anis, Suhana Arshad   +3 more
doaj   +1 more source

Assessing proton plans with three different beam delivery systems versus photon plans for head and neck tumors

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose To compare plan quality among photon volumetric modulated arc therapy (VMAT) and intensity‐modulated proton therapy (IMPT) with robustness using three different proton beam delivery systems with various spot size (σ) ranges: cyclotron‐generated proton beams (CPBs) (σ: 2.7–7.0 mm), linear accelerator proton beams (LPBs) (σ: 2.9–5.5 mm),
Tara Gray, Chieh‐Wen Liu, Saeed Ahmed, Anna Maria Kolano, Jeremy Donaghue, Shlomo Koyfman, Neil Woody, Shauna R. Campbell, Jonathan B. Farr, Ping Xia   +9 more
wiley   +1 more source

The effect of multi‐leaf collimator leaf width on VMAT treatment plan quality

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Background The advent of volumetric modulated arc therapy (VMAT) in radiotherapy has made it one of the most commonly used techniques in clinical practice. VMAT is the delivery of intensity modulated radiation therapy (IMRT) while the gantry is in motion, and existing literature has shown it has decreased treatment delivery times and the ...
Gregory Sadharanu Peiris, Brendan Whelan, Nicholas Hardcastle, Suzie Lynn Sheehy   +3 more
wiley   +1 more source

Discovery of the first accretion-powered millisecond X-ray pulsar [PDF]

arXiv, 1998
The precise origins of the millisecond radio pulsars, discovered in the early 1980s, remain uncertain until this day. They plausibly evolve from accreting low magnetic-field neutron stars in X-ray binary systems. If so, these stars should spin at millisecond rates.
arxiv  

The effect of kV imaging dose on PTV and OAR planning constraints in lung SBRT using stereoscopic/monoscopic real‐time tumor‐monitoring system

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose Quantify the impact of additional imaging doses on clinical dose constraints during lung stereotactic body radiotherapy (SBRT) treatment utilizing stereoscopic/monoscopic real‐time tumor monitoring. Materials and Methods Thirty lung SBRT patients treated with the volumetric arc therapy technique were randomly selected from the ...
Ruwan Abeywardhana, Mike Sattarivand
wiley   +1 more source

Effects of cardiac motion on dose distribution during stereotactic arrhythmia radioablation treatment: A simulation and phantom study

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose Cardiac motion may degrade dose distribution during stereotactic arrhythmia radioablation using the CyberKnife system, a robotic radiosurgery system. This study evaluated the dose distribution changes using a self‐made cardiac dynamic platform that mimics cardiac motion. Methods The cardiac dynamic platform was operated with amplitudes
Takayuki Miyachi, Takeshi Kamomae, Fumitaka Kawabata, Kuniyasu Okudaira, Mariko Kawamura, Shunichi Ishihara, Shinji Naganawa   +6 more
wiley   +1 more source