With the advances in the computer field, methods and techniques in automatic image processing and analysis provide the opportunity to detect automatically the change and degeneration in retinal images. Localization of the optic disc is extremely important for determining the hard exudate lesions or neovascularization, which is the later phase of diabetic retinopathy, in computer aided eye disea...

The geometry of the inner accretion flow in hard and hard-intermediate states X-ray binaries remains controversial. Using NICER observations black hole binary MAXI J1820+070 during rising phase its 2018 outburst, we study evolution timing properties, particular characteristic variability frequencies prominent iron K$\alpha$ line. frequency-resolved spectroscopy, find that reflection occurs at l...

We studied time variability and spectral evolution of the Galactic black hole transient Swift J174510.8–262411 during the first phase of its outburst. INTEGRAL and Swift observations collected from 2012 September 16 until October 30 have been used. The total squared fractional rms values did not drop below 5% and QPOs, when present, were type-C, indicating that the source never made the transit...

We present a comprehensive spectral-timing study of the black hole candidate MAXI J1659152 during its 2010 outburst. We analysed 65 RXTE observations taken along this period and computed the fundamental diagrams commonly used to study black hole transients. We fitted power density and energy spectra and studied the evolution of the spectral and timing parameters along the outburst. We discuss t...

An Al3Zr-reinforced Al matrix composite using metal powders was fabricated via in-situ synthesis in vacuum; these were subjected to a pin-on-disc wear test with SUS304 disc specimen under oil lubrication. The elemental mixture of and ZrH2 particles sintered vacuum for the in-situ-formed Al3Zr. thermally decomposed reaction form hard Al3Zr intermetallic compounds. friction coefficient volume val...

We report on the detection of a thermal disc component from the stellar-mass black hole binary XTE J1118+480 in the canonical low/hard state. The presence of a thermal component with a temperature of approximately 0.21 keV in the Chandra spectra of XTE J1118+480 is found at more than the 14σ confidence level. Based on this evidence, we argue that the accretion disc in XTE J1118+480 is not trunc...

The galactic black hole candidate Cygnus X–1 is observed to be in one of two X-ray spectral states; either the low/hard (low soft X-ray flux and a flat power law tail) or high/soft (high blackbody-like soft X-ray flux and a steep power law tail) state. The physical origin of these two states is unclear. We present here a model of an ionized accretion disc, the spectrum of which is blurred by re...