The solar corona is a very dynamic plasma on time scales of decades to a few milliseconds. Radio missions provide diagnostic tools particularly suited for the analysis of non-thermal electron distributions, enhanced levels of various kinds of plasma waves and plasma phenomena related to electron acceleration in flares. Very intense coherent emissions are observed at frequencies below about 3GHz...

Non-coherent receivers have become promising candidates for low complexity and low power ultra wide band (UWB) systems.Wediscuss the performance of energy detection and differential detection in additive white Gaussian noise, Rayleigh fading, and multipath environments. It is shown that non-coherent receivers can easily collect the multipath energy by means of equal gain combing. The loss (comp...

Frames which can be generated by the action of some operators (e.g. translation, dilation, modulation, ...) on a single element $f$ in a Hilbert space, called coherent frames. In this paper, we introduce a class of continuous frames in a Hilbert space $mathcal{H}$ which is indexed by some locally compact group $G$, equipped with its left Haar measure. These frames are obtained as the orbits of ...

‎In this paper‎, ‎a coherent system consisting of non-identical dependent active components and‎ ‎equipped with non-identical dependent standby components is considered‎. ‎The main object of this study is the random quantity‎ ‎which account the number of surviving standby components when the system‎ ‎is failed‎. ‎We represent the distribution function of the corresponding random variable in ter...

background: nonalcoholic fatty liver disease (nafld) is becoming a significant problem especially through substantial increase in the incidence of obesity worldwide. currently it is the most common cause of abnormal serum aminotransferase levels both in low- and middle-income countries and in high-income countries and despite its high prevalence, well-defined screening recommendations are curre...

The pulse profile of pulsar B1822 09 exhibits a very peculiar kind of mode changing: a “precursor” appearing just in front of the main pulse (MP) exhibits periods of nulling, during which an interpulse (IP) becomes detectable at a rotation phase separated by roughly 180 from the precursor. We propose that this bizarre phenomenon, which requires an information transfer between the two components...

CONSIDINE, v.: 'Digital complex sampling', Electron. Lett., 1983, 19, pp. 608-609 RICE, U. w., and wu, K. H.: 'Quadrature sampling with high dynamic range', IEEE Trans., 1982, AES-18, (4), pp. 736739 RAOER, c. M.: 'A simple method for sampling in-phase and quadrature components', IEEE Trans., 1984, AESZO, (6), pp. 821-824 RAFFEXTY, w., and SAULMER, G. I.: 'Variable-delay, sinelcosine noncoheren...

This paper examines the problems of symbol timing estimation and timing recovery for ultra wideband impulse radio signals. Two different approaches based on the maximum likelihood technique are investigated. The first approach is based on derivative matched filter and the second one takes advantage of the early-late technique. Furthermore, two non-coherent timing recovery circuits are proposed ...

Coherent emission appears to be a common phenomenon on radio-active late-type stars. Solar radio flare emissions below 3 GHz are rich and varied, arising from coherent processes in the upper solar atmosphere (Dulk 1985; Isliker & Benz 1994). Studies of decimetric radio emission from M dwarf flare stars have led to discovery of high brightness temperature, highly circularly polarized bursts (Bas...