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Given a population of N elements with their geographical positions and the genetic (or lexical) distances between couples of elements (inferred, for example, from lexical differences between dialects which are spoken in different towns or from genetic differences between animal populations living… |
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Community structures are found to exist ubiquitously in real-world complex networks. We address here the problem of community detection in directed networks. Most of the previous literature ignores edge directions and applies methods designed for community detection in undirected networks, which… |
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In this paper we revisit the problem of performing a QR-step on an unreduced
Hessenberg matrix H when we know an "exact" eigenvalue ?0 of H. Under exact arithmetic, this
eigenvalue will appear on diagonal of the transformed Hessenberg matrix H~ and will be decoupled
from the remaining part of the… |
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We apply the techniques of monotone and relative rearrangements to the non rearrangement invariant spaces Lp(·) (? ) with variable exponent. In particular, we show that the maps u ? L p( ·) (? ) -> k(t )u* ? L p * (·)(0, meas? ) and u ? L p( ·) (? ) -> u* ? Lp* (·) (0, meas? ) are locally ?-… |
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Usually, clinicians assess the correct hemodynamic behavior and fetal wellbeing during the gestational age thanks to their professional expertise, with
the support of some indices defined for Doppler fetal waveforms. Although
this approach has demonstrated to be satisfactory in the most of the… |
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Sap transport in trees has long fascinated scientists, and a vast literature exists on experimental and modelling studies of trees during the growing season when large negative stem pressures are generated by transpiration from leaves. Much less attention has been paid to winter months when trees… |
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Background: At present five evolutionary hypotheses have been proposed to explain the great variability of the
genomic GC content among and within genomes: the mutational bias, the biased gene conversion, the DNA
breakpoints distribution, the thermal stability and the metabolic rate. Several… |
