Hard x-ray emission 8 X rays 6 Accretion , accretion disks 4 Accretion disks 4 Accretion, accretion disks 4 Binaries: symbiotic 4 Boundary layers 4 Electromagnetic wave emission 4 Plasma devices 4 X ray analysis 4 X ray radiography 4 X ray scattering 4 X-rays: Binaries 4 X-rays: binaries 4 Accretion 2 Angular positions 2 Article 2 Association of variables 2 Bins 2 Breakdown property 2 Brightness variations 2 Burst alert telescopes 2 Classification scheme 2 Discharge chamber 2 Disk instabilities 2 Dosimetry 2 Electric discharges 2 Electrodes 2 Electron sources 2 Experimental demonstrations 2