We present a model for the different X-ray spectral states displayed by Galactic Black Hole Candidates (GBHC). We discuss the physical and spectral implications for a magnetically structured corona in which magnetic flares result from reconnection of flux tubes rising from the accretion disk by the magnetic buoyancy (Parker) instability. Using the observations of one of the best studied example...

We present the first results of coordinated multi-wavelength observations of the Galactic black hole GX 339−4 in a canonical low–hard state, obtained during its 2004 outburst. XMM-Newton observed the source for 2 revolutions, or approximately 280 ksec; RXTE monitored the source throughout this long stare. The resulting data offer the best view yet obtained of the inner accretion flow geometry i...

This year marks a significant change in the recent history of hard disk drive development. During the final years of the last century and for the last two years the areal density of magnetic recording had been increasing at rates close to or exceeding 100% per year. That meant that each generation of hard disk drive had a digital data capacity that was close to twice that of the previous genera...

Hard-disk recording of digital audio has moved from the domain of university research projects into the mainstream of commercial professional audio. This paper attempts to define a vocabulary for discussing the differences between different approaches to hard-disk recording, and to categorize these approaches. In the process of so doing, a number of related topics will be discussed. These inclu...

The design Method of the "Security Mobile Hard Disk Based on Hardware Encryption and Twoway ID Authentication" adopts the smart card-based technology of two way ID authentication, thus enables higher authentication strength than ordinary password authentication and USB-KEY one way certification; adoption of dedicated hardware encryption chip on encrypting the hard disk data enhances the encrypt...

Unit disk graphs are the intersection graphs of unit diameter closed disks in the plane. This paper reduces SATISFIABILITY to the problem of recognizing unit disk graphs. Equivalently, it shows that determining if a graph has sphericity 2 or less, even if the graph is planar or is known to have sphericity at most 3, is NP-hard. We show how this reduction can be extended to 3 dimensions, thereby...

Aleksandar Donev, 2 Salvatore Torquato, 3, ∗ Frank H. Stillinger, and Robert Connelly Program in Applied and Computational Mathematics, Princeton University, Princeton NJ 08544 Princeton Materials Institute, Princeton University, Princeton NJ 08544 Department of Chemistry, Princeton University, Princeton NJ 08544 Department of Mathematics, Cornell University, Ithaca NY 14853 (Dated: 24th Octobe...

During 1990, in response to the common problem of a filled hard disk, I became obsessed with the idea of producing a compact visualization of directory tree structures. Since the 80 Megabyte hard disk in the HCIL was shared by 14 users it was difficult to determine how and where space was used. Finding large files that could be deleted, or even determining which users consumed the largest share...