Abstract Short-duration gamma-ray bursts (sGRBs) are commonly attributed to the mergers of double neutron stars (NSs) or a star with black hole (BH). While former scenario was confirmed by event GW170817, latter remains elusive. Here, we consider in which an NS is tidally disrupted fast-spinning low-mass BH and accretion onto launches relativistic jet hence produces sGRB. The merging binary’s o...

Black hole X-ray binaries (BHXRBs) display a wide range of variability phenomena, from long duration spectral state changes to short-term broadband and quasi-periodic oscillations (QPOs). A particularly puzzling aspect is the production QPOs, which -- if properly understood could be used as powerful diagnostic tool black accretion evolution. In this work we analyse high resolution three-dimensi...

Planetesimal accretion during planet formation is usually treated as collisionless. Such accretion from a uniform and dynamically cold disk predicts protoplanets with slow retrograde rotation. However, if the building blocks of protoplanets, planetesimals, are small, of order of a meter in size, then they are likely to collide within the protoplanet’s sphere of gravitational influence, creating...

We discuss the relation between the power carried by relativistic jets and the nuclear power provided by accretion, for a group of blazars including FSRQs and BL Lac objects. They are characterized by good quality broad band X-ray data provided by the Beppo SAX satellite. The jet powers are estimated using physical parameters determined from uniformly modelling their spectral energy distributio...

The development of hard disk technology has not kept up with the general speed-up of computers and modern day technological developments like virtualization and cloud deployment. Flash storage, on the contrary, improves access speed and bandwidth significantly but at comparably higher costs. As in most scenarios only a fraction of the actual data stored on disk is ever used in arbitrary operati...

In recent years, near-IR and X-ray flares have been detected from the Galaxy’s central radio point source, Sagittarius A* (Sgr A*), believed to be a ∼ 3 × 10 M⊙ supermassive black hole. In some cases, the transient emission appears to be modulated with a (quasi-)periodic oscillation (QPO) of ∼ 17 − 20 minutes. The implied ∼ 3 rS size of the emitter (where rS ≡ 2GM/c 2 is the Schwarzschild radiu...

We present a novel concept to process human blood on a spinning polymer disk for the determination of the hematocrit level by simple visual inspection. The microfluidic disk which is spun by a macroscopic drive unit features an upstream metering structure and a downstream blind channel where the centrifugally enforced sedimentation of the blood is performed. The bubble-free priming of the blind...

Daniel Abramovitch Hewlett-Packard Laboratories 1501 Page Mill Road, M/S 2U-10 Palo Alto, CA 94304 Abstract– This paper describes the PES Pareto Method, a useful tool for identifying and eliminating key contributors to uncertainty in the Position Error Signal (PES) of a magnetic disk drive[1, 2, 3]. Once identified and ranked according to their overall effect on PES, the top–ranking sources can...

background and importance: disk sequestration can be defined as a herniated disk with perforation of the fibrous ring (or outermost annulus fibrosus) and posterior longitudinal ligament with migration of the disk fragment to the epidural space. even after the introduction of high-resolution magnetic resonance imaging (mri), it is still frequently misinterpreted as neoplastic masses. unfortunate...