We present a simultaneous periodic and aperiodic timing study of the accreting millisecond X-ray pulsar SAX J1808.4-3658. We analyze five outbursts of the source and for the first time provide a full and systematic investigation of the enigmatic phenomenon of the 1 Hz flares observed during the final stages of some of the outbursts. We show that strong links between pulsations and 1 Hz flares e...

We have studied the performance of global 2 tting applied to low-resolution X-ray spectroscopy, focusing on the retrieval of source parameters , with emphasis on the coronal metallicity. The study has been conducted by tting large numbers of simulated spectra with known characteristics , and studying the distribution of the best-t parameters, using the responses of the LECS detector onboard the...

The network management area has some proposals to use XML to encode information models and managed object instances. In this paper we present a solution to dynamically create SNMP to XML proxies using a SAX parser and the translation facilities from the libsmi tools. We also present an analysis system that uses the management information provided by the proxies in XML.

We report the discovery with BeppoSAX-WFC of two new X-ray sources that were only seen during bursts: SAX J1753.5-2349 and SAX J1806.5-2215. For both sources, no steady emission was detected above an upper limit of 5 mCrab (2 to 8 keV) for 3 10 s around the burst events. The single burst detected from SAX J1753.52349 shows spectral softening and a black body color temperature of 2.0 keV. Follow...

We present two BeppoSAX observations of BL Lac (2200+420) as part of a multiwavelength campaign performed in 2000. The source was in different states of activity: in June, the X–ray spectrum was faint and hard (α ∼ 0.8), with positive residuals towards low energies. In October we detected the highest [2–10] keV flux ever measured for the source. During this observation, the spectrum was soft (α...

J. Stausberg; U. Altmann; G. Antony; J. Drepper; U. Sax; A. Schütt Institut für Medizinische Informationsverarbeitung, Biometrie und Epidemiologie (IBE), Ludwig-Maximilians-Universität München, Germany; Institut für Medizinische Informatik, Justus-Liebig-Universität Giessen, Germany; Kompetenznetz Parkinson, Marburg, Germany; TMF – Technology, Methods, and Infrastructure for Networked Medical R...

This article aims at contrasting aspectual oppositions in English and Persian in the context of the novel The Old Man and the Sea, and its translation by Daryabandari (1983) as the data. Unlike English, in Persian perfective and imperfective forms are morphologically marked. While the vast majority of English simple past forms are translated into Persian by past perfective forms, only less than...

We examine analytically and numerically the evolution of a relativistic fireball. We show that, after an early rearrangement phase, most of the matter and energy in the fireball is concentrated within a narrow shell. The shell propagates at nearly the speed of light, with a frozen radial profile and according to a simple set of scaling laws. The spectrum of the escaping radiation is harder at e...