The provision of broad-band services based on either the Internet or the asynchronous transfer mode (ATM) technique requires a new generation of access networks. In the short term, solutions such as x-digital subscriber line (DSL) and hybrid fiber coaxial (HFC), allowing the reuse of existing infrastructures, look very promising. For the longer term, new infrastructures based either on radio or...

We report broad-band X-ray measurements of the Be star γ Cassiopeiae by the BeppoSAX X-ray astronomy satellite. The observations took place on 1998 July, 18–23. The 0.1– 200 keV X-ray spectrum is reasonably well fit by an optically thin thermal plasma model of temperature 12.5±0.6 keV with significant residuals around 0.3 keV and 1 keV. The former is interpreted as the variable soft component r...

We developed an instrument design capable of measuring linear X-ray polarization over a broad-band using conventional spectroscopic optics. A set of multilayer-coated ats reects the dispersed X-rays to the instrument detectors. The intensity variation with position angle is measured to determine three Stokes parameters: I, Q, and U – all as a function of energy. By laterally grading the multila...

A phenomenological model of broadband impedance containing two free parameters has been recently proposed. This paper attempts to assign physical charaterizations to these free parameters by relating them to the geometric dimensions of a stand-alone cavity structure. Contributed paper at the Broadband Impedance Measurements and ModelZing Workshop SLAC, Stanford, USA February 28 March 2, 2000 ‘W...

In this paper, an Ultra High Frequency (UHF) base band processor for a passive tag is presented. It proposes a Radio Frequency Identification (RFID) tag digital base band architecture which is compatible with the EPC C C2/ISO18000-6B protocol. Several design approaches such as clock gating technique, clock strobe design and clock management are used. In order to reduce the area Decimal Matrix C...

The ultra wide band (UWB) Direct Chaotic Communication (DCC) technology is considered in application to low bit rate information transmission. Performances of low bit rate DCC are discussed. In particular we pay attention to the effect of multipath processing. The implementation and experimental verification of basic elements for low bit rates DCC are also presented. Index terms – Ultra wide ba...

I briefly introduce a database of models that describe the evolution of star clusters in several broad-band photometric systems. Models are based on the latest Padova stellar evolutionary tracks – now including the α-enhanced case and improved AGB models – and a revised library of synthetic spectra from model atmospheres. As of today, we have revised isochrones in Johnson-Cousins-Glass, HST/WFP...