172,034 research outputs found
L'organizzazione degli interventi: continuità, discontinuità, strutture e professionalità nello scavo archeologico
No full textVengono presi in esame gli aspetti inerenti la ricerca archeologic
Lo studio dei reperti litici
No full textVengono prese in esame le modalità di schedatura dei materiali litici e le possibili analisi morfologiche, funzionali e statistich
Modalità di scoperta delle testimonianze e dei siti: segnalazioni, gruppi amatoriali, prospezioni, saggi
No full textVengono descritte le modalità per l'individuazione e il recupero dei materiali archeologic
Gli interventi sistematici: 2.1.2 Sintesi dei dati già acquisiti e noti in letteratura
No full textSono presentati i risultati già noti in letteratura relativi agli interventi interdisciplinari realizzati nello studio del giaciment
Respuesta a C. Duverger
No full textLaurencich Minelli Laura. Respuesta a C. Duverger. In: Journal de la Société des Américanistes. Tome 80, 1994. pp. 286-289
Gli interventi sistematici. 2.1. Isernia La Pineta. 2.1.6a - L'industria litica: l'industria in calcare del sito paleolitico di Isernia La Pineta
No full textSono illustrate le caratteristiche tecniche e tipologiche dei reperti in calcar
Respuesta a C. Duverger
No full textLaurencich Minelli Laura. Respuesta a C. Duverger. In: Journal de la Société des Américanistes. Tome 80, 1994. pp. 286-289
Pectiniunguis ascendens Pereira, Minelli & Barbieri 1994
No full textPectiniunguis ascendens Pereira, Minelli & Barbieri, 1994 (Figs 57–68) Pectiniunguis ascendens Pereira, Minelli & Barbieri, 1994: 174 –176. De Morais, Adis, Berti-Fihlo, Pereira, Minelli & Barbieri, 1997: 117, 118, 119. Pereira, Minelli & Foddai, 1999: 177. Pereira, Foddai & Minelli, 2000: 3, 54. Foddai, Pereira & Minelli, 2000: 127, 177. Foddai, Pereira & Minelli, 2004: 279. Pereira, 2011: 315. Type material examined. Holotype female with 45 leg-bearing segments, body length 23 mm, from Brazil: Amazonas: Rio Tarumã Mirím, Igapó, 16 September 1976, Coll: J. Adis. (INPA). Supplemental morphological information. Female holotype: The following additional morphological details are provided regarding the antennae: Ventral and dorsal surface of a.a. II, V, IX and XIII with very small specialized sensilla. On the ventral side the sensilla are restricted to an internal latero-apical area, represented by two different types (a and b). Type a sensilla very thin and not split apically, type b sensilla very similar to those of the apex of a.a. XIV but thicker, with two diminutive apical branches slightly more evident than those of the latter. Specialized sensilla on dorsal side restricted to external latero-apical area and represented by three different types: a and b similar to a and b of ventral side; and type c sensilla, similar to type b; but thicker, not divided apically and darker (ocherous in color). Number and distribution of type a, b, and c sensilla as in Table 3. Remarks. The original description by Pereira et al. (1994), only mentions two types of specialized sensilla (hereby individualized as “ type b ” and “ type c ”). The original source of this nomenclature is Pereira et al. (1995). Distribution. Known only from the type locality.Published as part of Pereira, Luis Alberto, 2018, A new high-altitude species of centipede from the Andes of Ecuador (Chilopoda, Geophilomorpha, Schendylidae), pp. 409-426 in Zootaxa 4374 (3) on page 421, DOI: 10.11646/zootaxa.4374.3.5, http://zenodo.org/record/115543
Permeability and solubility of carbon dioxide in different glassy polymer systems with and without plasticization
No full textThe description of permeability and solubility of CO 2 in different complex polymer matrices in the glassy
state is analyzed by considering the diffusion coefficient as the product of a kinetic factor, mobility, and a
thermodynamic factor associated to the concentration dependence of the chemical potential of the
diffusing species, according to what recently presented for different pure polymers [Minelli and Sarti, J.
Membr. Sci. 435 (2013) 176–185]. The thermodynamic factor is calculated in a predictive way by using
the nonequilibrium lattice fluid model (NELF) or is obtained directly from experimental solubility
isotherms, when pure component parameters for the NELF model are not available. The mobility factor is
considered to depend exponentially from penetrant concentration, following the usual trend commonly
found experimentally, and its expression contains only two adjustable parameters. The permeability
model is used to describe steady state permeation of CO 2 in a series of complex glassy phases, formed by
polysulfone (PSf) and polyphenylene oxide (PPO) with different plasticizers, glassy polymer blends,
glassy random copolymers and crosslinked polyimides. The analysis shows that in all the cases
examined, the model used is able to describe the experimental trends in a simple and effective way,
accounting for all the different behaviors observed, in which permeability is either decreasing or
increasing with upstream pressure and even when permeability is non-monotonous and presents a
minimum value due to the so-called plasticization effect. A general correlation is also found for both
model parameters: the infinite dilution mobility correlates well with the reciprocal fractional free
volume, according to the FFV theory, while the plasticization factor is associated to the swelling
coefficient of the polymer matrix
Elementary prediction of gas permeability in glassy polymers
No full textThe transport model proposed by Minelli and Sarti for the representation of gas and vapor permeability in glassy polymers has been extensively applied to various systems, and the model results are thoroughly analyzed. The approach is based on fundamental theory for the diffusion of low penetrant species in polymers, in which the diffusivity is considered as the product of the molecular mobility, and a thermodynamic coefficient, accounting for the concentration dependence of the chemical potential. The model relies on the thermodynamic description of the penetrant/polymer systems provided by the NonEquilibrium Thermodynamics for Glassy Polymers (NET-GP) approach. The penetrant mobility is assumed to depend exponentially on penetrant concentration, and the model contains two parameters only: mobility coefficient at infinite dilution and plasticization factor. The model parameters obtained from the analysis of the permeability behaviors of various systems have been examined and general correlations are derived. The mobility coefficient is indeed correlated to the properties of the pure penetrants (penetrant molecular size) and pure polymer (fractional free volume and characteristic energy). This allows the derivation of a simple and general expression for the prediction of the permeability of any penetrant species in glassy polymers in the range of low penetrant pressures, as well as the selectivity of any gas pair. Remarkably, the model predictions are able to represent quite accurately the experimental data available in the literature. Furthermore, the plasticization factor is correlated to the swelling produced by the penetrant into the glassy polymer matrix, obtaining thus a reliable tool for the estimation of the pressure dependence of gas permeability on upstream pressure
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