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Recent revelations as to the ability of APTs to embed code in hard disk firmware, as well as the existence of prior public literature describing similar work, raise concerns as to the future potential proliferation and weaponization of this technique. We describe previous work in this domain, including both recent revelations and prior research, and then discuss our strategy for mitigating the ...

We report the broadband spectro-temporal study of poorly studied accreting neutron star (NS) low mass X-ray binary (LMXB) 4U 1724-30 using data from Soft Telescope (SXT) and Large Area Proportional Counters (LAXPC) instruments on board AstroSat. The dim persistent LMXB source was observed with AstroSat over 4 epochs in 2017, all which corresponded to a low-luminosity non-thermal emission domina...

We report the spectral analysis of a long XMM-Newton observation of the well-studied, moderate luminosity Broad Line Seyfert 1 galaxy NGC 5548. The source was at an historically average brightness and we find the hard (3-10 keV) spectrum can be well fitted by a power law of photon index Γ∼1.75, together with reflection. The only feature in the hard X-ray spectrum is a narrow emission line near ...

abstract   background: far lateral discal herniation is an uncommon disorder and is difficult to assess by physical examination alone. this study is designed to define clinical and epidemiological findings and to establish the indications of surgical and medical treatment for flldh.   methods: between 2000 and 2005, a total of 2035 patients with lumbar disc herniation underwent surgical discect...

A model for the inner regions of accretion flows is presented where, due to disc instabilities, cold and dense material is clumped into deep sheets or rings. Surrounding these density enhancements is hot, tenuous gas where coronal dissipation processes occur. We expect this situation to be most relevant when the accretion rate is close to Eddington and the disc is radiation-pressure dominated, ...

Relativistic spectral lines from the accretion disc of a neutron star low-mass X-ray binary can be modelled to infer the disc inner edge radius. A small value of this radius tentatively implies that the disc terminates either at the neutron star hard surface, or at the innermost stable circular orbit (ISCO). Therefore an inferred disc inner edge radius either provides the stellar radius, or can...

Aims. We present a study of the diffuse X-ray emission in the halo and the disc of the starburst galaxy NGC 253. Methods. After removing point-like sources, we analysed XMM-Newton images, hardness ratio maps and spectra from several regions in the halo and the disc. We introduce a method to produce vignetting corrected images from the EPIC pn data, and we developed a procedure that allows a cor...

Aims. We study the changes in geometry of truncated disc and inner hot-flow GX 339–4 by analysing power spectral density (PSD) extracted from six XMM-Newton observations taken at very end an outburst. Methods. developed a theoretical model PSD 0.3–0.7 keV (thermal-reverberation-dominated) 0.7–1.5 (disc-continuum-dominated) energy bands. The assumes standard accretion to be specific radius, insi...

Elemental powders of iron (Fe), molybdenum (Mo), and carbon (C) were mixed in a pot mill to obtain the compositions C45, C45–1% Mo, C45–2% Mo steels. They then compacted sintered. The sintered preforms had density 75% theoretical (TD). Then, subjected densification two densities 80% 85% TD through forging. densified alloy steel subsequently machined required wear test specimens. experiments con...