We have detected pulsed emission from the Vela pulsar at 2 30 keV during a 93 ks observation with the Rossi X-Ray Timing Explorer (RXTE). The RXTE pulse profile shows two peaks, that are roughly in phase with the EGRET peaks, but does not show any significant interpeak emission. The phase of Peak 2 is energy dependent, moving to higher phase with increasing energy in the RXTE band, in phase ali...

We present a new technique to accelerate the convergence of the folded spectrum method in empirical pseudopotential band edge state calculations for colloidal quantum dots. We use bulk band states of the materials constituent of the quantum dot to construct initial vectors and a preconditioner. We apply these to accelerate the convergence of the folded spectrum method for the interior states at...

We present a new technique to accelerate the convergence of the folded spectrum method in empirical pseudopotential band edge state calculations for colloidal quantum dots. We use bulk band states of the materials constituent of the quantum dot to construct initial vectors and a preconditioner. We apply these to accelerate the convergence of the folded spectrum method for the interior states at...

The goal of bandwidth extension of speech (BWE) is to extrapolate the missing low or high frequency components of the wide-band speech (50-8000 Hz) based entirely on information contained in a narrow-band signal (300-3400 Hz). In this paper we propose a new method for high-frequency regeneration of the excitation signal, using the correlation between the shape of the glottal flow waveform and t...

Wireless systems require spectrum to operate, but interference is likely if radios in physical proximity simultaneously operate on the same band. Therefore, spectrum is a potentially scarce resource; across the planet today, spectrum is regulated so that most bands are allocated exclusively to a single system licensed to use that band in any given location. However, such static spectrum allocat...

Traditionally a majority of the commercial satellite communications systems have been fixed repeaters at C-band and Ku-band. The satellite industry is presently undergoing significant changes in the types of systems that are being fielded. New low earth orbit and geo stationary mobile systems have large numbers of flexible beams at either L-band or S-band through the use of large phased array a...

We present an exact diagonalization study of the doping dependence of the single particle Green’s function in 16, 18 and 20-site clusters of t−J model. We find evidence for the validity of the rigid-band picture starting from the half-filled case: upon doping, the topmost states of the quasiparticle band observed in the photoemisson spectrum at half-filling cross the chemical potential and reap...