Search results for "Groups"

showing 10 items of 1120 documents

Vacuum-ultraviolet absorption of amorphous SiO2: intrinsic disorder and role of silanol groups

2008

We present a study on the vacuum-ultraviolet VUV absorption properties of amorphous SiO2 a-SiO2 with high concentrations of silanol groups Si-OH . We found that the absorption spectra are made up of a couple of exponential profiles. The first, in the range from 7.5 to 8.1 eV, was attributed to Si-OH group absorption, while the second, in the range from 8.1 to 8.25 eV, was ascribed to the intrinsic absorption. The VUV absorption cross section of Si-OH groups in a-SiO2 was determined as well. The intrinsic absorption was found to be affected by the Si-OH concentration: high silanol group contents allow lower values of the Urbach energy. This result is interpreted in terms of a reduction in th…

Settore FIS/01 - Fisica SperimentaleVacuum UV absorption amorphous silicon dioxide absorption edge silanol groups
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Palermo si cura. Pratiche culturali di mutuo soccorso come risposta alle fragilità della città (post)pandemica

2023

In un quadro di riferimento in cui la crisi è globalizzata ma diseguale e in mancanza di un sistema di welfare capace di rispondere alle urgenze dei contesti e dei gruppi sociali più marginalizzati, una risposta ai nuovi bisogni sociali ed individuali è stata offerta da reti solidali e da pratiche di mobilitazione dal basso che svolgono un ruolo di agency territoriale, spesso indipendentemente o in assenza di Istituzioni. Nel contesto palermitano un impegno agito da una pluralità di soggetti culturali già attivi sul territorio, riuniti in un’assemblea pubblica (Palermo si cura), durante il periodo del primo lockdown hanno dato vita ad azioni di mutuo soccorso per rispondere all’emergenza ec…

Settore ICAR/21 - UrbanisticaIn a framework in which the crisis is globalized but unequal and in the absence of a welfare system capable of responding to the urgencies of the most marginalized contexts and social groups a response to the new social and individual needs has been offered by networks of solidarity and from bottom-up mobilization practices that play a role of territorial agency often independently or in the absence of institutions. In the Palermo context a commitment made by a plurality of cultural subjects already active in the area gathered in a public assembly (Palermo si cura) during the period of the first lockdown gave rise to mutual aid actions to respond to the economic emergency and social and offer a proposal to cure the fragility of the city based not on charity but on the claim of a political dimension of collective action. Starting from the analysis of initiatives such as "Un sorriso per Ballarò" and "Abbiamo un (bi)sogno" the contribution analyzes the role the incidence and the fragility of these experiences in providing answers - often filling gaps - to a general interest and how these processes of value creation can hopefully contribute to the construction of local government policies capable of addressing emerging issues.
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Un contributo ‘palermitano’ al ciclo giulio-claudio di Centuripe

2021

The Julio-Claudian portraits from Centuripe. A contribution from Palermo · The sculptural group of Julio-Claudian princes from Centuripe (en, Sicily) deserves an in-depth analysis after the recent works by R. Patané, who collected a lot of data and proposed a new interpretation of the whole context. Patané’s proposals are discussed starting from two pieces in the Regional Archaeological Museum “Antonino Salinas” at Palermo. A fragment of a cuirassed statue, discovered in the 19th century near the Chiesa del Crocifisso (that is, near the “Edificio degli Augustali”, at that time not yet discovered), is similar to several fragments belonging to three to six different statues of the Julio-Claud…

Settore L-ANT/07 - Archeologia ClassicaJulio-Claudians Cuirassed statues Family groups Private portraiture Centuripe s.c. Edificio degli Augustali.
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Is more choice always worse? Age differences in the overchoice effect

2015

ABSTRACTCurrent research on the overchoice effect has been mainly conducted from an adult point of view and with adult subjects. This study investigates whether children, adolescents, and seniors suffer the same negative consequences as adults when facing an overabundance of choice. Findings showed that the overchoice effect did not equally extend to all age groups. While adolescents were affected by the phenomenon in a very similar way as adults, children and seniors suffered fewer negative consequences of an overabundance of choice. Theoretical and practical implications are discussed.

Settore M-PSI/01 - Psicologia GeneraleAge differences05 social sciencesExperimental and Cognitive Psychology050105 experimental psychologyDevelopmental psychologyAge groupsPhenomenon0502 economics and business050211 marketing0501 psychology and cognitive sciencesPsychologyPractical implicationsoverchoice effect age differences decision making
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Are children’s levels of national and supranational identification related to their attitudes towards the national and supranational ingroup and outg…

2010

Settore M-PSI/04 - Psicologia Dello Sviluppo E Psicologia Dell'EducazioneNational and European identification attitudes ingroup and outgroups
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In-group Favouritism and Out-group Derogation in a Developmental Perspective: Italian Children’s Attitudes towards National Groups.

2008

Settore M-PSI/04 - Psicologia Dello Sviluppo E Psicologia Dell'Educazionechildrennational groupintergroup attitudeDevelopmental intergroup attitudes ingroup favouritism outgroup derogation national groups
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The nonabelian tensor product of two soluble minimax groups

2010

Settore MAT/02 - AlgebraChernikov groups soluble minimax groups nonabelian tensor productsSettore MAT/03 - Geometria
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A generalization of groups with many almost normal subgroups

2010

A subgroup $H$ of a group $G$ is called almost normal in $G$ if it has finitely many conjugates in $G$. A classic result of B. H. Neumann informs us that $|G : Z(G)|$ is finite if and only if each $H$ is almost normal in $G$. Starting from this result, we investigate the structure of a group in which each non- finitely generated subgroup satisfies a property, which is weaker to be almost normal.

Settore MAT/02 - AlgebraDietzmann classeanti-$\mathfrak{X}C$-groupChernikov groups.Settore MAT/03 - Geometriagroups with $\mathfrak{X}$-classes of conjugate subgroup
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On Pseudofunctors Sending Groups to 2-Groups

2023

For a category B with finite products, we first characterize pseudofunctors from B to Cat whose corresponding opfibration is cartesian monoidal. Among those, we then characterize the ones which extend to pseudofunctors from internal groups to 2-groups. If B is additive, this is the case precisely when the corresponding opfibration has groupoidal fibres.

Settore MAT/02 - AlgebraGeneral MathematicsMathematics::Category TheoryFOS: Mathematicsinternal groupsMathematics - Category TheoryCategory Theory (math.CT)2-groupsPseudofunctorSettore MAT/04 - Matematiche Complementari2-groups; internal groups; monoidal opfibration; Pseudofunctor18A40 18C40 18D30 18G45 18M05monoidal opfibration
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A Survey on Just-Non-X Groups

2010

Let be a class of groups. A group which does not belong to but all of whose proper quotient groups belong to is called just-non- group. The present note is a survey of recent results on the topic with a special attention to topological groups.

Settore MAT/02 - AlgebraJNX groups MNX groups topological groupsSettore MAT/03 - Geometria
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