196,740 research outputs found

    Finite group with Hall coverings

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    In this paper we describe the groups admitting a covering with Hall subgroups. We also determine the groups with a \pi-Hall subgroup, where \pi is the connected component of the prime graph, containing the prime 2

    Investigationes on population dynamics and mortality of Phyllocnistis citrella in western Sicily (Italy)

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    Population dynamics and mortality of P. citrella, and its natural enemies with parasitism levels in two different citrus orchards, sprayed and unsprayed, were investigated. The effect of host density on percentage parasitism and mortality was calculated by regression analyses. In both sites, over the 3-years period from 2002 to 2004, P. citrella was detected during the summer months and it was not found during the first flush. Population levels were low, never exceeding 3.0/leaf. P. citrella began to increase from June in 2002-2003 and from July in 2004. The monthly percentage parasitism of P. citrella in sprayed orchard fluctuated from 0 to 19%, while in unsprayed from 0 to 30%. High mortality was found in both locations with maximum levels of 100%. No significant regression was found between CLM population and parasitism and mortality percentage. Small differences between results in two orchards were foun

    Una nuova Sicilia?

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    Si analizzano gli elementi di novità registrati in occasione della tornata di elezioni regionali del 2012, e si ipotizzano le connessioni di queste novità con la crisi economica della regione

    Before web-marketing: digital tour landscapes from relational users

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    Online visibility of a cultural site can be considered a strong indicator of the institutional ability to activate the cultural heritage. With the spread of the Internet into social practices of millions of people, the search for contents relating to a travel destination or a specific monument, has gradually shifted in terms of strategic influence from traditional channels to online information resources. The public opinion on the quality of cultural heritages or events depends less and less from the assessment of traditional agencies and it is instead increasingly dependent on user reviews and rankings based on social network sharing activities

    A characterization of the sporadic group of Lyons

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    We show that Lyons' sporadic simple group is the unique finite simple group GG that is simultaneously of weak characteristic rr-type and characteristic pp-type for odd rr and pp with r<pr<p and mr,p(G)2m_{r,p}(G)\geq 2
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