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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 66 (2005), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Internal stomach melanism was observed in two scalloped ribbonfish Zu cristatus from the Ligurian Sea. The phenomenon may help prevent advertizing the presence of this species after consumption of bioluminescent prey.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Foundations of physics 2 (1989), S. 235-244 
    ISSN: 1572-9524
    Keywords: uncertainty ; locality ; separability ; factorizability ; EPR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A quantum covariance function is introduced whose real and imaginary parts are related to the independent contributions to the uncertainty principle: noncommutativity of the operators and nonseparability. It is shown that factorizability of states is a sufficient but not necessary condition for separability. It is suggested that all quantum effects could be considered to be a consequence of nonseparability alone.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Foundations of physics 4 (1991), S. 49-59 
    ISSN: 1572-9524
    Keywords: nonseparability ; noncommutativity ; incompatibility ; quantum covariance ; EPR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The quantum covariance function is calculated in some EPR-like systems for commuting observables in order to illustrate the nonseparability contribution to the incompatibility between commuting operators. It is shown that an attempt to eliminate the noncommutativity contribution to incompatibility fails in finite-dimensional cases and would require a nonseparable Hilbert space (nonseparable in the mathematical sense).
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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  • 5
    Publication Date: 2017-04-04
    Description: Petrographic, minerochemical, and geothermobarometric data are reported for a suite of 19 spinel-lherzolite pargasite xenoliths hosted in a Quaternary basanitic lava flow from 20 the North-Western Ethiopian Plateau (Injibara, Lake Tana Province). Protogranular to 21 porphyroclastic (deformed) rocks show evidence of a modal metasomatism, represented 22 by a Cl-rich pargasitic amphibole, coupled with criptic enrichment in Fe and Al. 23 Equigranular rocks (granular) record a further cryptic metasomatism, represented by 24 enrichment in Fe, Al, Na, and depletion in Ni, Cr and Cl. Some xenoliths (transitional) 25 show intermediate textural and compositional characters, indicating that the granular 26 samples represent an evolution of the deformed ones. All xenoliths give the same P–T 27 equilibration conditions for Opx-Cpx pairs (947–1015 C and 1.3–2 GPa), but in 28 granular samples, recrystallised olivine and spinel record T about 100 C higher. Two 29 distinct metasomatic processes, probably connected with the emplacement of the Afar plume, are proposed. The first one is a pervasive modal metasomatism produced by 2 water-rich fluids. The latter is a non-pervasive cryptic metasomatism, probably con- 3 nected to migration of melts. The comparison among the mantle beneath the Ethiopi- 4 an Volcanic Plateau, the southern Main Ethiopian Rift and the central Main Ethiopian 5 Rift suggests a spatial heterogeneity in mantle processes, during asthenospheric 6 upwelling.
    Description: In press
    Description: 1–32
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: reserved
    Keywords: lithosphere ; Ethiopian ; 04. Solid Earth::04.01. Earth Interior::04.01.01. Composition and state ; 04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
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  • 6
    Publication Date: 2020-02-24
    Description: Petrographic, minerochemical, and geothermobarometric data are reported for a suite of spinel-lherzolite pargasite xenoliths hosted in a Quaternary basanitic lava flow from the North-Western Ethiopian Plateau (Injibara, Lake Tana Province). Protogranular to porphyroclastic (deformed) rocks show evidence of a modal metasomatism, represented by a Cl-rich pargasitic amphibole, coupled with cryptic enrichment in Fe and Al. Equigranular rocks (granular) record a further cryptic metasomatism, represented by enrichment in Fe, Al, Na, and depletion in Ni, Cr and Cl. Some xenoliths (transitional) show intermediate textural and compositional characters, indicating that the granular samples represent an evolution of the deformed ones. All xenoliths give the same P–T equilibration conditions for Opx-Cpx pairs (947–1015 C and 1.3–2.0 GPa), but in granular samples, recrystallised olivine and spinel record T about 100 C higher. Two distinct metasomatic processes, probably connected with the emplacement of the Afar plume, are proposed. The first one is a pervasive modal metasomatism produced by water-rich fluids. The latter is a non-pervasive cryptic metasomatism, probably connected to migration of melts. The comparison the mantle beneath the Ethiopian Volcanic Plateau, the southern Main Ethiopian Rift and the central Main Ethiopian Rift suggests spatial heterogeneity of the mantle and variable mantle processes during asthenospheric upwelling.
    Description: Published
    Description: 47-78
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: reserved
    Keywords: lithosphere ; peridotite xenoliths ; Ethiopian Volcanic Plateau ; Metasomatism ; 04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
    Publication Date: 2015-09-15
    Description: The thick gypsum deposits formed in the Mediterranean Basin during the Messinian salinity crisis incorporate dense mazes of filamentous fossils, which were interpreted as algae or cyanobacteria, thus pointing to a shallow-marine subtidal or intertidal environment. The data presented here reveal that these filaments represent remains of colorless, vacuolated sulfide-oxidizing bacteria. This interpretation is supported by the presence of small crystal aggregates of iron sulfide (pyrite) and associated polysulfide within the filamentous fossils. Pyrite and polysulfide are considered to result from early diagenetic transformation of original zero-valent sulfur globules stored within the cells, which is a clade-diagnostic feature of living and degraded sulfur bacteria. In addition to filamentous fossils, the studied gypsum crystals contain remains of euryhaline and stenohaline diatoms and clay-rich aggregates interpreted as alteration products of marine snow floccules. This peculiar fossil assemblage reflects conditions of increased productivity in the water column, triggered by high fluxes of nutrients into the basin during phases of enhanced riverine runoff and freshwater discharge. This study confirms that gypsum evaporites have great potential to preserve the early stages of the taphonomic alteration of bacterial cells, shedding light on the paleoecology of ancient hypersaline environments.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 8
    Publication Date: 2015-02-13
    Description: This review combines fluid inclusion data from (HP-)UHP rocks with experimental research and thermodynamic models to investigate the chemical and physical properties of fluids released during deep subduction, their solvent and element transport capacity, and the subsequent implications for the element recycling in the mantle wedge. An impressive number of fluid inclusion studies indicate three main populations of fluid inclusions in HP and UHP metamorphic rocks: (1) aqueous and/or non-polar gaseous fluid inclusions (FI); (2) multiphase solid inclusions (MSI); and (3) melt inclusions (MI). Chemical data from preserved fluid inclusions in rocks match with and implement "model" fluids by experiments and thermodynamics, revealing a continuity behind the extreme variations of physico-chemical properties of subduction-zone fluids. From fore-arc to sub-arc depths, fluids released by progressive devolatilization reactions from slab lithologies change from relatively diluted chloride-bearing aqueous solutions (±N 2 ), mainly influenced by halide ligands, to (alkali) aluminosilicate-rich aqueous fluids, in which polymerization probably governs the solubility and transport of major (e.g., Si and Al) and trace elements (including C). Fluid inclusion studies point to a reconsideration of the petrological models explaining deep volatile liberation, and their flux into the mantle wedge.
    Print ISSN: 0003-004X
    Electronic ISSN: 1945-3027
    Topics: Geosciences
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  • 9
    Publication Date: 2014-11-29
    Description: One of the peculiarities of Turin (NW Italy) lies on the presence of monumental arcades which mainly consist of stone material. These arcades, characterized by more than 12 km of interconnected paths, represent one of the widest city promenades of Europe and are an architectural, aesthetic and socio-economic example unique in the world. This paper, analysing the urban axis of Via Roma (Rome Street), aims to study the material used in arcade construction. The main stones occurring in Via Roma have been identified and described from a petrographic and mineralogical point of view in order to find out the corresponding geological units and original quarry sites. The minero-petrographic study is accompanied by an architectural survey that was performed applying different methods, as well as the geometric mapping and the perspective rectification of span-types, of block terminations and of other architectonical elements, in plan and in elevation, of the arcades. This allows us to emphasize the merging of cultural and scientific interest for the stone materials used in the historical architecture of a town closely interconnected to the surrounding Western Alps orogenic chain.
    Print ISSN: 0305-8719
    Electronic ISSN: 2041-4927
    Topics: Geosciences
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  • 10
    Publication Date: 2013-01-17
    Description: Los extranjeros autorizados en 2006-2009 a residir en España por motivos de reagrupación familiar, muestran la importancia que ha alcanzado esta forma de inmigración en el total de nuevos extranjeros empadronados. La investigación se basa en una encuesta específica a reagrupantes africanos y latinoamericanos, que también informan sobre sus familiares reagrupados, hayan utilizado, o no, las leyes de reagrupación. Africanos y latinoamericanos ofrecen dinámicas y estructuras sociodemográficas muy diferentes, a resultas, entre otras causas, de la antigüedad de sus flujos, su fecundidad, su dominio del idioma español, su nivel de instrucción, sus posibilidades de ingresos, su estructura por sexo y edad, tamaño de las familias reagrupadas, etc. Se ofrece información para los dos colectivos continentales y para los subgrupos familiares —reagrupantes, cónyuges, hijos, progenitores y otros familiares—, y se utilizan escalas del conjunto estudiado y de ámbitos territoriales —Cataluña litoral, Comunidad Valenciana, Murcia-Almería—. Los africanos concentran los aspectos estructurales más negativos —idioma español, instrucción, ingresos,…—, pero también son los que declaran intenciones más firmes y generalizadas de permanencia en España. Las conclusiones orientan sobre el futuro de estos flujos. [fr] Le nombre d’étrangers autorisés à résider en Espagne entre 2006 et 2009 pour des raisons de regroupement familial démontrent l’importance acquise par cette forme d’immigration par rapport au total des nouveaux étrangers recensés. Cette recherche est fondée sur une enquête spécifique réalisée sur des demandeurs de regroupement africains et latino-américains, qui informent aussi sur les membres de leur famille ayant été regroupés, ayant eu recours ou non aux lois sur le regroupement. Les Africains et les Latino-Américains présentent des dynamiques et des structures sociodémographiques très différentes, ce qui est dû, entre autres causes, à l’ancienneté de leur flux migratoires, à leur fécondité, à la maîtrise de la langue espagnole, au niveau d’instruction, aux possibilités de revenus, à la structure par sexe et par âge, à la dimension des familles regroupées, etc. Nous présentons des informations sur les deux collectifs continentaux et sur les sous-groupes familiaux – demandeurs de regroupement, conjoints, enfants, géniteurs et autres membres de la famille –, et nous utilisons des échelles de l’ensemble étudié et des unités territoriales – littoral de la Catalogne, Communauté Valencienne, Murcie-Almería. Les Africains concentrent les aspects structurels les plus négatifs – maîtrise de la langue espagnole, niveau d’instruction, revenus… –, mais ce sont aussi ceux qui déclarent l’intention la plus ferme et généralisée de vouloir rester en Espagne. Les conclusions servent d’orientation sur l’avenir de ces flux migratoires.
    Print ISSN: 0014-1496
    Electronic ISSN: 1988-8546
    Topics: Geography
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