It is well known that fast CMEs are mostly associated with magnetohydrodynamic (MHD) shocks in the solar corona, forming type-II radio bursts. However, absence of bursts not uncommon. Herein, we aim to analyze differences between loud (RL) and quiet (RQ) Coronal Mass Ejections (CMEs) (speed ≥ 900 km s−1) during Solar Cycle 24 (2008 – 2021). From 309 CMEs, could identify 143 events a source orig...

We investigate the populations and evolution of normal and active galaxies by extending the infrared source count model of Rowan-Robinson (2001) into the radio. The FIR-radio correlation is used to extend the SEDs to the radio region and it is assumed that there are two distinct populations of quasar: radio loud and radio quiet. It is found that the radio luminosity function and source count da...

For this purpose, a technical approach for all.and improve the spectrum utilization, cognitive radio concept has been evolved. Cognitive radios are the radio systems that autonomously coordinate the. Levels for the cognitive radio system. We have studied intelligent channel selection for transmission of data and control information based on.Fundamental Design Tradeoffs in Cognitive Radio System...

Réseaux de radio cognitive : Allocation des ressources radio et accès dynamique au spectre 2 Réseaux de radio cognitive : Allocation des ressources radio et accès dynamique au spectre 5

Background: Hesperidin is a bioflavonoid glycoside mainly found in citrus fruit and has been shown radio-protective potential in various measurement systems. Objective: In this article aims to investigate the radio-protective effect of hesperidin on the liver of Sprague Dawely rats. Material and Methods: In this clinical study, 40 male rats were selected randomly and divided into 8 ...

A statistical study is presented of (a) the frequency of narrow C iv λ1549 absorption lines in 1.5 < ∼ z < ∼ 3.6 radio-quiet and radio-loud quasars, and of (b) the UV and radio properties of the absorbed quasars. The quasar sample is unbiased with respect to absorption properties and the radio-quiet and radio-loud subsamples are well matched in redshift and luminosity. A similarly high incidenc...

We present VLBI (EVN+MERLIN) observations of a sample of three low-redshift radio-intermediate PG quasars (RIQ) with at and variable radio spectrum (III Zw 2, PG 1309+355, PG 2209+184). Their radio-to-optical ux ratio (R) is slightly lower than the average R for steep-spectrum quasars, but their radio spectral properties are those of core-dominated quasars. It was proposed previously that these...

A sample of 2712 radio–luminous galaxies is defined from the second data release of the Sloan Digital Sky Survey (SDSS) by cross–comparing the main spectroscopic galaxy sample with two radio surveys: the NRAO VLA Sky Survey (NVSS) and the Faint Images of the Radio Sky at Twenty centimetres (FIRST) survey. The comparison is carried out in a multi– stage process and makes optimal use of both radi...