We have used the velocity dispersion as an age indicator to constrain the ages of a large sample of main sequence Vega-like stars in order to study the lifetimes and temporal evolution of the dust disks around them. We use Hipparcos measurements to compute stellar velocities in the sky plane. The velocity dispersion of Vega-like stars is found to be systematically smaller than that of the norma...

We have used the velocity dispersion as an age indicator to constrain the ages of a large sample of main sequence Vega-like stars in order to study the lifetimes and temporal evolution of the dust disks around them. We use Hipparcos measurements to compute stellar velocities in the sky plane. The velocity dispersion of Vega-like stars is found to be systematically smaller than that of the norma...

avian intestinal spirochaetosis (ais) is an intestinal infection caused by anaerobic spirochaetes of the genus brachyspira, including b. pilosocoli. the purpose of this study was isolation and identification of b. pilosocoli from laying hen flocks, located in mashhad suburb, khorasan razavi province, iran, and investigating the frequency of the infection. one hundred and eighty cloacal swab sam...

DNA splicing in genomes is a critical and important task to pay attention. Several approaches have been proposed for genic region prediction accuracy in Eukaryotes that mostly rely on digital signal processing techniques with incorporation of indicator sequence methods but an optimal solution is required that could provide the best minimization of 1/f noise and maximization of discrimination be...

When comparing the average citation impact of research groups, universities and countries, field normalisation reduces the influence of discipline and time. Confidence intervals for these indicators can help with attempts to infer whether differences between sets of publications are due to chance factors. Although both bootstrapping and formulae have been proposed for these, their accuracy is u...