On the Relative Surface Density Change of Thermally Unstable Accretion Disks [PDF]
, 1997 The relations among the relative changes of surface density, temperature, disk height and vertical integrated pressure in three kinds of thermally unstable accretion disks were quantitatively investigated by assuming local perturbations. The surface density change was found to be very small in the long perturbation wavelength case but can not be ...
arxiv +1 more source
NLTE Monte Carlo Radiative Transfer: I. The Thermal Properties of Keplerian Disks around Classical Be Stars [PDF]
Astrophys.J.639:1081-1094,2006, 2005 We present a 3-D NLTE Monte Carlo radiative transfer code that we use to study the temperature and ionization structure of Keplerian disks around Classical Be stars. The method we employ is largely similiar to the Monte Carlo transition probability method developed by Lucy. Here we present a simplification of his method that avoids the use of the macro
arxiv +1 more source
Instability of Population III Black Hole Accretion Disks [PDF]
, 2007 We investigate the stability of black hole accretion disks in a primordial environment (POP III disks for short), by solving the vertical structure of optically thick disks, including convective energy transport, and by employing a one-zone model for optically thin isothermal disks. Because of the absence of metals in POP III disks, we find significant
arxiv +1 more source
BEAC-Net: Boundary-Enhanced Adaptive Context Network for Optic Disk and Optic Cup Segmentation
Applied Sciences, 2023 Accurately segmenting the optic disk (OD) and optic cup (OC) on retinal fundus images is important for treating glaucoma. With the development of deep learning, some CNN-based methods have been implemented to segment OD and OC, but it is difficult to ...
Lincen Jiang +4 more
doaj +1 more source
UV/optical disk thermal reverberation in AGN: an in-depth study with an analytic prescription for the time-lag spectra [PDF]
, 2020 Several active galactic nuclei show correlated variations in the ultraviolet/optical range, with time delays increasing at longer wavelengths. Thermal reprocessing of the X-rays illuminating the accretion disk has been proposed as a viable explanation. In this scenario, the variable X-ray flux irradiating the accretion disk is partially reflected in X ...
arxiv +1 more source
Infrared autofluorescence, short-wave autofluorescence and spectral-domain optical coherence tomography of optic disk melanocytomas [PDF]
Int J Ophthalmol, 2016 Peng Zhang +6 more
openalex +2 more sources
Clinical Ophthalmology, 2011 Yu Yokoyama, Naoko Aizawa, Naoki Chiba, Kazuko Omodaka, Masahiko Nakamura, Takaaki Otomo, Shunji Yokokura, Nobuo Fuse, Toru NakazawaDepartment of Ophthalmology, Tohoku University Graduate School of Medicine, Sendai, JapanBackground: Eyes with glaucoma ...
Yokoyama Y +8 more
doaj
The Spectral States of Black Hole X-ray Binary Sources [PDF]
, 1996 A framework for the interpretation of the spectral states of black hole X-ray transients based on the diversity of accretion disk models is introduced. Depending on the mass accretion rate, it is proposed that the accretion disk is described by one or a combination of the following structures: optically thick disk, advection-dominated disk, corona-disk,
arxiv +1 more source
CHANGES OF THE OPTIC DISC SIZE IN PATIENTS WITH EARLY GLAUCOMA AND GLAUCOMA SUSPECTS
Офтальмохирургия, 2015 Purpose. To compare optic disk measurements using two devices the HRT 3 and the Cirrus HD-OCT in healthy individuals and glaucoma patients / glaucoma suspec ts.Material and methods.
A. A. Shpak +2 more
doaj
The Herschel DIGIT Survey of Weak-line T Tauri Stars: implications for disk evolution and dissipation [PDF]
, 2012 As part of the "Dust, Ice, and Gas In Time (DIGIT)" Herschel Open Time Key Program, we present Herschel photometry (at 70, 160, 250, 350 and 500 micron) of 31 Weak-Line T Tauri star (WTTS) candidates in order to investigate the evolutionary status of their circumstellar disks.
arxiv +1 more source