156 research outputs found
HIGH-FLUIDITY POLYAMIDE
No full textPolyamides for rapid melt processability are manufd. by polymn. of mixts. of (1) dicarboxylic acids and diamines or their salts, (2) 0.05-0.5 mol% (based on diacids and diamines) compds. having ≥3 X1 functional groups, and (3) 0.5-2 mol% (based on diacids and diamines) compds. having 1 X2 functional group, such that when (2) has X1 functional groups based on carboxylic acids, then (3) has X2 functional group based on carboxylic acid or when (2) has X1 functional groups based on amines then (3) has X2 functional group based on amine. A typical polyamide was manufd. by polymn. of 11.111 kg salt based on equimolar adipic acid-hexamethylenediamine mixt. with 81 g 2,2,6,6-tetrakis(β-carboxyethyl)cyclohexanone in the presence of 80 g BzOH 2 h at 280° and 7.5 atm
Archeologia Medievale a Ravenna: un progetto per la città ed il territorio
No full textDescrizione delle ricerche archeologiche nella città di Ravenna e nel suo territori
Multi-source monitoring data and numerical analyses for the assessment of settlements affecting built-up areas in variable soil conditions
No full textThis paper presents an integrated analysis based on the use of multi-source wide-area datasets consisting of hydro-mechanical properties of geomaterials, in-situ investigations/measurements (e.g. groundwater levels in wells) and innovative space-borne data (i.e. DInSAR techniques) to support numerical analyses aimed at assessing and predicting the settlements affecting built-up areas in variable soil conditions. To this aim, an expeditious procedure was developed and tested with reference to a district in Rotterdam City (The Netherlands) affected by subsidence phenomena due to the presence of heterogeneous settling strata mainly composed by peat and organic soils. The results obtained allowed investigating the role of predisposing factors of the settlement occurrence and assessing the induced damage on buildings. Considering the widespread diffusion of such geohazards, the followed procedure could help the in-charge authorities to carry out activities at urban scale aimed at identifying the areas most affected by subsidence risk and to select the most suitable and sustainable mitigation strategies.Applied MechanicsGeo-engineerin
Scavi sulla Rocca di Garda (VR)
No full textSintesi delle ricerche archeologiche presso la Rocca di Garda (VR
Un approccio metodologico per la gestione del rischio in aree urbane affette da frane a cinematica lenta
No full textNumerosi insediamenti urbani sono localizzati in aree del territorio nazionale affette da frane a cinematica lenta le quali, sebbene si associno a livelli di rischio non elevati per la vita umana, possono causare danni crescenti a strutture ed infrastrutture in funzione dell’intensità degli stessi fenomeni. In tali contesti, il progressivo degrado che ne consegue determina un incremento generalizzato della vulnerabilità del costruito e il rischio da frane a cinematica lenta aumenta nel tempo, a parità di pericolosità dei fenomeni. Nelle condizioni evidenziate, in assenza di adeguati interventi di mitigazione e dopo un intervallo di tempo non noto a priori, il livello di rischio (anche nei riguardi di terremoti di assegnata magnitudo) potrebbe non essere più accettabile. Il problema richiamato risulta di particolare impatto economico-sociale e impone l’adozione di opportune strategie per la gestione del rischio che siano efficaci e, al contempo, sostenibili da parte delle comunità interessate. Nella memoria, facendo riferimento a casi di studio della Regione Calabria, si propone un approccio metodologico multi-scalare basato sul monitoraggio satellitare degli spostamenti in aree urbane affette da frane a cinematica lenta e sulla valutazione speditiva della severità del danno al patrimonio edilizio, per definire strategie di gestione del rischio che contemplino la programmazione di interventi di mitigazione efficaci e sostenibili
Empirical fragility curves for settlement-affected buildings: Analysis of different intensity parameters for seven hundred masonry buildings in The Netherlands
No full textThe analysis and prediction of damage to buildings resting on highly compressible fine-grained ‘‘soft soils” containing (organic) clay
and peat are key issues to be addressed for a proper management of subsidence-affected urban areas. Among the probabilistic approaches suggested in literature, those oriented to the generation of empirical fragility curves are particularly promising provided that a comprehensive dataset for both the subsidence-related intensity (SRI) parameters and the corresponding damage severity to buildings is available. Following this line of thought, in the present paper, a rich sample of more than seven hundred monitored (by remote sensing) and surveyed masonry buildings – mainly resting with their (shallow or piled) foundations on soft soils – is analysed in four urban areas of The Netherlands. Probabilistic functions in the form of fragility curves for building damage are retrieved for three different SRI parameters (i.e., differential settlement, rotation and deflection ratio) derived from the processing of Synthetic Aperture Radar (SAR) images by way of a differential interferometric (DInSAR) technique in combination with the severity levels of the damage recorded from the visual inspection of over 700 masonry buildings. As a novelty with respect to earlier similar studies, the work points out the methodological steps to be followed in order to identify the most appropriate SRI parameter among the selected ones. Thus, the objective of the paper is to improve the existing geotechnical forecasting tools for subsidence-affected urban areas, in order to target areas that require more detailed investigations/analyses and/or to select/prioritize foundation repairing/replacing measures
La ceramica da cucina, dispensa e mensa (secc. X-XIV), in R. Fiorillo, A. Corolla, Le ceramiche, in Salerno. Un castello per la sua città, pp. 36-44, Salerno 2009
No full textIl volume è frutto della collaborazione tra la Provincia di Salerno ed il Laboratorio "N. Cilento per l'Archeologia Medievale" del Dipartimento di Latinità e Medioevo dell'Università di Salerno, per una iniziativa culturale legata all'inaugurazione della sezione espositiva realizzata all'interno delle sale del castello. Una fruizione più ampia dello spazio è stata resa possibile dall'allestimento dello spazio espositivo dove hanno trovato posto i reperti recuperati durante gli scavi degli anni '90, curata dalla sottoscritta e da Paolo Peduto con l'ausilio degli studenti della scuola di specializzazione
District-scale numerical analysis of settlements related to groundwater lowering in variable soil conditions
No full textThis study presents a novel framework in which numerical modelling contributes to the performance of district-scale, subsidence-induced damage assessment in cities where ground settlements affect entire quarters. Therein, the implementation of expeditious procedures offers geotechnical engineers the possibility of contributing beyond the typical site scale. For this purpose, several “typified” hydro-geomechanical-loading (HGL) models, which represent (simplified) scenarios of masonry buildings undergoing settlements, were set up to account for different predisposing or triggering factors (i.e., soil heterogeneity, loading conditions, and groundwater variations) of settlement occurrence in built-up areas. These models exploit multi-source, wide-area input datasets encompassing the hydro-mechanical properties of geomaterials, in situ investigations and measurements (e.g., groundwater levels in wells), and innovative remote sensing data (i.e., DInSAR techniques). With reference to a district in Rotterdam City (the Netherlands), which was built on “soft soils”, the numerical simulations of different scenarios (i) provide an overview of the comparative role of predisposing or triggering factors on settlement occurrence and (ii) allow assessments of the expected induced damage to masonry buildings over 30 years with the exploitation of fragility curves. Considering the widespread diffusion of such geohazards, the proposed approach could help prioritise (rather expensive) maintenance work to the built heritage within sustainable strategies for subsidence risk mitigation.Applied MechanicsGeo-engineerin
Method and Circuit for Generating Memory Addresses for a Memory Buffer
No full textA method for generating sequences of memory addresses for a memory buffer having N*M locations includes making a first address and a last address of every sequence respectively equal to 0 and to N*M−1, assigning a first sequence of addresses, and each address but a last address of another sequence of addresses is generated by multiplying a corresponding address of a previous sequence by N, and performing a modular reduction of this product with respect to N*M−1. The method further includes calculating a greatest bit length of every address, and calculating an auxiliary constant as the modular reduction with respect to N*M−1 of the power of two raised to twice the greatest bit length. Each sequence of addresses includes storing an auxiliary parameter equal to an N+1th address of the current sequence, computing a first factor as the modular product with respect to N*M−1 of the auxiliary constant based upon a ratio between the auxiliary parameter and the power of two raised to the greatest bit length, and generating all addresses but the last of a sequence by performing the Montgomery algorithm using the first factor and an address index varying from 0 to N*M−2 as factors of the Montgomery algorithm, and with the quantity N*M−1 as modulus of the Montgomery algorithm, and the greatest bit length as the number of iterations of the Montgomery algorithm
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