1,724,755 research outputs found
Ron Muraro Oral History Interview
No full textAn oral history interview with Ron Muraro, a professor and Florida Extension economist. The interview focuses on the history of citrus cultivation in both Brazil and Florida, the economics of raising citrus, and mechanical harvesting
Dire Dio nella lingua materna
No full textSi tratta di un libro-intervista a Luisa Muraro, pensatrice laica e femminista interessata a temi religiosi. Nella conversazione con la filosofa e teologa Lucia Vantini, Muraro offre una ripresa del suo pensiero, ma apre al contempo un mondo in cui la differenza sessuale può prendere un senso libero e fare da mediatrice tra sacro e profano, tra religioso e laico, tra filosofia e teologia
La riforma dei servizi pubblici locali. Introduzione
No full textE' l'introduzione al numero monografico "La riforma dei servizi pubblici locali" curata da C. Buratti e G. Muraro. Contiene le linee essenziali di quanto emerso dai singoli saggi
Experimental determination of the shear strength of peat from standard undrained triaxial tests: correcting for the effects of end restraint
Get PDFConventional triaxial tests on peats are strongly criticised due to the very high shear strength parameters obtained from standard data elaboration, leading to unrealistic factors of safety when used in geotechnical design and assessment. Various operational approaches have been proposed in the literature to overcome this difficulty; however, they seem to lack consistent mechanical background. Some of the issues related to the shear strength evaluation of peats from triaxial tests come from the non-uniform stress and strain states developing in the samples well before failure is attained, due to end restraint effects. Undrained triaxial compression tests were performed on reconstituted peat to examine the influence of end restraint on the deviatoric stress, excess pore pressure and deviatoric strain response. Samples were tested with standard rough end platens and with modified platens to reduce the friction between the sample and bottom and top caps. Four different initial height-to-diameter ratios were examined, to reduce the consequences of rough end platens on the sample response. The results indicate that end restraint contributes dramatically to overestimating the shear strength of peat, due to the increase in both the calculated deviatoric stress and the measured excess pore pressure at the bottom of the sample. Suggestions are given to quantify the influence of end restraint in the interpretation of standard data, in an attempt to suggest viable procedures to determine more reliable effective and undrained shear strength parameters from standard triaxial tests
Pre-failure behaviour of reconstituted peats in triaxial compression
Get PDFThis paper discusses the results of an experimental programme designed to investigate the deviatoric behaviour of peats. The results are obtained from triaxial experiments carried out on reconstituted peat samples. The interpretation of the experimental results follows a hierarchical approach in an attempt to derive the ingredients that an elastic–plastic model for peats should contain, including the yield locus, the hardening mechanism and the flow rule. The results obtained from stress tests along different loading directions show that purely volumetric hardening is not adequate to describe the deviatoric response of peat and that a deviatoric strain-dependent component should be included. The plastic deformation mechanism also depends on the previous stress history experienced by the sample. Stress and strain path dependence of the interaction mechanisms between the peat matrix and the fibres is discussed as a possible physical reason for the observed behaviour. This work offers a relevant set of data and information to guide the rational development and the calibration of constitutive laws able to model the deviatoric behaviour of peats.Geo-engineerin
Éxpérience de Dieu et différence féminine
No full textMuraro Luisa. Éxpérience de Dieu et différence féminine. In: Les Cahiers du GRIF, Hors-Sérien°2, 1996. Âmes fortes, esprits libres. pp. 33-47
Gas exsolution and gas invasion in peat: Towards a comprehensive modelling framework
No full textIncreasing climatic stresses accelerate the degradation of highly organic soils, like peat, by increasing their drying rate above the water table and their decomposition rate under water. Recent experimental studies provide evidence of the consequences of these processes on the hydro-mechanical properties of peat. However, modelling the experimental evidence in a comprehensive framework remains challenging, especially in the case of anaerobic degradation, which is accompanied by gas generation, exsolution and expansion, into an initially saturated matrix of soil. In this research study, experimental results from undrained isotropic unloading on artificially gas-charged peat samples are combined with data from drying tests on the same peat, in an attempt to develop a unified framework encompassing the two desaturation processes. As a first approximation, simple compression laws depending on the average stress acting on the soil skeleton are used to simulate the experimental results. The comparison between experimental data and model simulations suggests the possibility of modelling gas expansion similar to the gas invasion process occurring on drying. The modelling approach, stemming from unsaturated soil mechanics, is meant to offer a possible framework to include the hydro-mechanical consequences of the effects of degradation of peats in the engineering analysis. Accepted author manuscriptGeo-engineerin
Deformational response of a marine silty-clay with varying organic content in the triaxial compression space
Get PDFThis study characterises the effects of naturally varying organic content on the compression and shear behaviour of a marine silty-clay from the Netherlands. Index properties and mechanical properties are determined through laboratory tests, including oedometer and multistage loading-unloading triaxial stress paths. The results indicate a significant impact of the organic content on the compression response, with both the loading and reloading indexes increasing as the loss on ignition increases from 3% to 7%. Additionally, the study suggests a directional response of the compression behaviour, with the loading index increasing with the stress ratio. The influence of the organic content on shear strength appears to be less significant. No brittle response is observed during shearing and a similar ultimate stress ratio is attained by all samples. However, a unique critical state line can only be identified for samples with similar organic content, as its intercept and slope are found to increase with increasing organic content. The experimental results from stress paths at constant stress ratio reveal an anisotropic pre-failure plastic deformation mode, which depends on the previous stress history and loading direction. This suggests that the stress-dilatancy relationship cannot be formulated as a unique function of the stress ratio. The high-quality experimental data presented in the paper enlarge the database on soft organic soils in view of the development of advanced constitutive models.Accepted Author ManuscriptGeo-engineerin
Donne e politica. Interviste a L. Cigarini, A. Del Re, I.Dominijanni, E. Donini, M.Forcina, L. Muraro
No full textnell'intervista è affrontato il tema del possibile cambiamento del meccanismo della politica-potere e della rappresentanz
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