1,531 research outputs found
Spatial Correlations in Attribute Communities
No full textCommunity detection is an important tool for exploring and classifying the properties of large complex networks and should be of great help for spatial networks. Indeed, in addition to their location, nodes in spatial networks can have attributes such as the language for individuals, or any other socio-economical feature that we would like to identify in communities. We discuss in this paper a crucial aspect which was not considered in previous studies which is the possible existence of correlations between space and attributes. Introducing a simple toy model in which both space and node attributes are considered, we discuss the effect of space-attribute correlations on the results of various community detection methods proposed for spatial networks in this paper and in previous studies. When space is irrelevant, our model is equivalent to the stochastic block model which has been shown to display a detectability-non detectability transition. In the regime where space dominates the link formation process, most methods can fail to recover the communities, an effect which is particularly marked when space-attributes correlations are strong. In this latter case, community detection methods which remove the spatial component of the network can miss a large part of the community structure and can lead to incorrect results
Fault-Diagnosis of Grid Structures
No full textTheprobl] offaul diagnosis in grid-connected systems is considered. A diagnosisalnosisFI caln DAGS and based on the PMCmodel is presented. DAGS provides a diagnosis which is shown to be correct, alrect, possibl incomplB[I if thecardinalq; of theactual faul set isbelB a bound T # , dependent of theactual syndrome #. A bound T independent of # is alF derived by a worst-caseanalt-c covering the cases oftriangul;; square,hexagonal and octagonal grids. T is shown to be #(n ), where n is the size of the system, for al the grids considered. c 2002El2FB#I Science B.V.Al rights reserved. Keywords: FauleDFBVU#IFqV Faul diagnosis;System-l;FV diagnosis;Paralos architectures 1. I363S-222 Faul diagnosis is of primary importance to provide highdependabilBk incomplE systems. It aims at identifying the(faul] ornon-faulB] state of the units composing a system. Upon identi#cation,fault units may be eitherreplrF; orisolEIB from the rest of the system, andfaul recovery or recon#guration techniques may be used to restore a coherent state,alte,FB the system to resume operation,possibl with reduced performance (graceful degradation). System-l-T( diagnosis was introduced by Preparata et al [14] and has beendeepl investigated in lBI#]VFqBE It aims at diagnosing systems composed by units(usualE processors), with the requirement that they are abl to test each other by exchanging information through point-to-pointbi-directional li-di A system is represented by the system graph G=(N; L), an undirected graph where node set N represents units and # Corresponding author. Instituto diElB;;BFq;E] del;;BFq;E]BFl; del CNR, Via S. Maria 46, 56126, Pisa,ItalB E-mail address: [email protected] (S. Chessa). 0304-3975/02/$ - see front matter c 2002El2FVVU Science B.V.Al rights reserved. PII: S0304-3975(..
Essential oil composition of Tordylium apulum L. from Italy
No full textThe essential oil composition of aerial parts of Tordylium apulum L. from Italy was analyzed by GC and GC/MS. Sixty-seven compounds were identified representing 96.5% of the oil. The most abundant compounds were (E)-β-ocimene (17.3), α-humulene (11.4%) and octyl octanoate (8.8%)
M. Piane, C. Savio, A. Altigeri, R. Pusateri, F.Ferrari, N. Pasquale, M.T. Contestabile, L. Chessa
No full textLa coroideremia (CHM; MIM 303100) è una malattia a trasmissione X-linked recessiva, caratterizzata da
degenerazione progressiva della coroide, dell’epitelio retinico pigmentato e della retina nervosa.
Generalmente i maschi affetti sviluppano durante l'adolescenza cecità notturna seguita da progressiva
perdita della visione periferica nella seconda e terza decade di vita e restringimento progressivo del campo
visivo, che può portare negli anni a cecità totale. Le femmine portatrici generalmente presentano alterazioni
pigmentarie circoscritte a livello della periferia retinica, ma non danno visivo evidente . Il gene mutato in
questa patologia è CHM, localizzato in Xq21.2 e costituito da 15 esoni; codifica per REP-1 (Rab escort protein
1), una delle proteine coinvolte nelle modificazioni post-traduzionali delle proteine Rab, che regolano il
traffico intracellulare tra i vari compartimenti vescicolari della cellula. Le mutazioni finora descritte causano
l’assenza o la perdita di funzione di REP-1. Abbiamo identificato in unpaziente italiano con coroideremia una
nuova mutazione del gene
CHM, c.819+2T>A, che determina l’eliminazione dell’esone 6 durante il processo di maturazione dell’RNA
messaggero,. L’analisi di segregazione della mutazione nella famiglia ha permesso di identificare lo stato di
portatrice della madre e della sorella e di confermare il sospetto diagnostico di coroideremia in altri tre
familiari
How code-based linear static analysis for the seismic design of masonry buildings may fail to be conservative
No full text
Substitution reactions between bis-chelate ligands in palladium(II) alkenyl complexes: an unusual way to form unstable trans-P complexes. A study on the isomerization mechanism
No full textThe substitution reactions between asymmetric bis-chelate ligands and alkenyl chloro derivatives of palladium(II) of the type [Pd(L-L')(Rx)Cl] (L-L' = 2-phenylsulfanylmethyl-pyridine (HN-SPh), 2-methyl-6-phenylsulfanylmethyl-pyridine (MeN-SPh), 2,2'-bipyridinyl (BiPy), Rx = -CCOOMe=CMeCOOMe (Ra), -CCOOEt=CMeCOOEt (Rb), -CCOOt-Bu=CMeCOOt-Bu (Rc), -(CCOOMe=CCOOMe)(2)Me (Rd)) with phosphoquinoline moieties (8-diphenylphosphanyl-quinoline (DPPQ), 8-diphenylphosphanyl-2-methyl-quinoline (DPPQ-Me)) usually leads to the formation of the stable geometrical isomer bearing these groups in the cis position thanks to the mutual trans influence of the alkenyl and phosphine groups. However, when the leaving group MeN-SPh and the entering ligand DPPQ are involved, the fast and quantitative substitution reaction leads to the formation of a couple of geometrical isomers [Pd(DPPQ)(Rx)Cl]-trans P and [Pd(DPPQ)(Rx)Cl]-cis P (Rx = Ra, Rb, Rc, Rd) in which the alkenyl and the phosphine groups are in mutual trans or cis position. The substrate [Pd(DPPQ)(Rx)Cl]-trans P (Rx = Ra, Rb, Rc) slowly interconverts into its thermodynamically stable -cis P counterpart while the bulky [Pd(DPPQ)(Rd)Cl]-trans P displays no tendency to isomerize, thereby allowing separation of the two geometrical forms. Also, the ligand DPPQ-Me induces the formation of the -trans P geometrical isomer which is only detectable at low temperature since it rapidly interconverts into the -cis P derivative at RT. The kinetics of the interconversion process, a reasonable explanation of the observed phenomenon based on theoretical calculations, and eventually an unequivocal structure determination of the stable [Pd(DPPQ)(Rx)Cl]-cis P substrate are reported in the present paper
Primary and secondary characterization of a Vermentino grape clones collection
No full textVermentino is one of the main grape variety cultivated in the west Mediterranean region, mainly in France (Provence and Corsica) and in Italy (Sardinia, Tuscany and Ligury). Due to the high quality of its monovarietal wines, Vermentino has increased its importance in the last two decades, while previously has been regarded as a minor variety covering small surfaces. Through clonal selection Vermentino clones have been patented and diffused among growers in Corsica and in Italy. On a collection of 14 Italian and Corsican Vermentino clones, ex situ preserved in Sardinia, ampelographic data, phenological stages, and agronomic characteristics, such as yield, bud fertility, bunch and berry weight, pH, acidity and SST of must, were recorded from 2004 to 2005. The description of the Vermentino genotypes evidenced the identities and the distinctive traits within the clones collection, increasing the information on their agronomic performance in a common area of cultivation
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