500 research outputs found

    The Flexible Institutionalization Process of Puma Currency in Seville, Spain

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    Grassroots groups depend on dynamic and fluid interactions with high trust to retain their identity. At the same time, a stable structure and division of labour with rules and hierarchies is necessary to sustain their organisation and social influence. The study explores this organisational dilemma by drawing on the category of flexible institutionalisation. It enquires how actors experience this balancing act between spontaneous solidarity and hierarchical structures in the life of the collective. The study focuses on the PUMA complementary currency in Seville, which was the brainchild of a neighbourhood association, a degrowth group and the local community. Puma functioned as a mutual credit system with a passbook and later as a digital wallet. The research presents primary data collected in 2014, 2017 and 2019 and concludes that the institutionalisation of social innovations is purposefully incomplete and reg-ulates spaces of spontaneity and caring to preserve solidarity and identit

    Search for black holes and other new phenomena in high-multiplicity final states in proton-proton collisions at root s=13 TeV

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    Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

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    Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search

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    Measurement of the mass difference between top quark and antiquark in pp collisions at root s=8 TeV

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    Search for leptophobic Z ' bosons decaying into four-lepton final states in proton-proton collisions at root s=8 TeV

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    Pteridófitas da Serra Negra, Minas Gerais, Brasil

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    Este trabalho apresenta uma lista de espécies de pteridófitas que ocorrem na Serra Negra, Minas Gerais. A serra está inserida no complexo da Serra da Mantiqueira situada entre Rio Preto, Lima Duarte, Santa Bárbara do Monte Verde e Olaria, tendo seus limites nos pontos 21º58'11"S 43º53'21" W, 22º01'46,4" S 43º52'31,5" W, 21º58'21,4" S 43º50'06,5" W e 21º58'53" S 43º56'08" W. A vegetação da serra é formada por um mosaico de fitofisionomias, sendo encontradas formações florestais (florestas ombrófilas e semidecíduas) e campestres (campos rupestres). O inventário florístico foi realizado entre os anos de 2003 e 2008, em excursões mensais para coleta de amostras e registro de dados. Na serra foram registradas 209 táxons infragenéricos distribuídas em 24 famílias e 75 gêneros. As famílias com maior número de espécies foram Polypodiaceae (40), Dryopteridaceae (33) e Pteridaceae (25). A maioria das espécies (109) foi encontrada ocorrendo exclusivamente no interior de floresta. Em relação ao hábito, 69 espécies foram encontradas exclusivamente como terrestres, 37 como rupícolas ou terrestres e 32 exclusivamente epífitas. Este trabalho revela uma elevada riqueza de pteridófitas na região e indica a importância de estudos desta natureza na conservação e manejo das pteridófitas em Minas Gerais.This work presents an inventory of pteridophyte species that occur in the Serra Negra, of Minas Gerais. The area is part of the Mantiqueira Range, and is situated between the coordinates 21º58'11"S 43º53'21" W, 22º01'4.4" S, 43º52'31.5" W, 21º58'21.4" S, 43º50'06.5" W and 21º58'53" S, 43º56'08" W. The vegetation in the Serra Negra is characterized by a mosaic of different phytophysiognomies, divided into forests (evergreen and seasonal semideciduous forests) and open formations (rocky grasslands). The inventory was carried out from 2003 to 2008, during monthly excursions to collect botanical material and data in the study area. A total of 209 species, distributed in 24 families and 75 genera, were recorded. The families with the highest number of species were Polypodiaceae (40), Dryopteridaceae (33) and Pteridaceae (25). More than the half (110) of the inventoried species were recorded exclusively in the forests formations. Sixty-nine species were terrestrial, 37 were saxicolous or terrestrial and 32 were epiphytes. This work shows that this region is rich in ferns and reveals the importance of this kind of study for conservation and management of pteridophytes in the state of Minas Gerais
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