104,257 research outputs found
Dr. Giacomo Cecconi
No full textBotanico: Cecconi, Giacomo.
Assistente di scienze naturali nel regio istituto forestale di Vallombrosa.
Titolo manoscritto su carta incollata sul recto, dove compare anche la nota: luglio 1901.
Nota manoscritta sul verso: G. Cecconi.
1 fotografia : aristotipo ; 100 x 58 mm.
Vai alla scheda bibliografica: https://galileodiscovery.unipd.it/discovery/fulldisplay?context=L&vid=39UPD_INST:VU1&search_scope=MyInst_and_CI&tab=Everything&docid=alma99001503220020604
Esercizi e problemi di Analisi Matematica
No full textIl testo si affianca al manuale di Cecconi-Stampacchia seguendolo nei vari capitoli, integrando sia i problemi preliminari progressivi sia i problemi di riepilogo. Si particolare significato sono le tavole fuori testo per illustrare in modo visivo le funzioni inverse mediante l'uso di carta semitrasparente. Sono inoltre di notevole utilità le brevi sintesi dei paragrafi e soprattutto il commento sugli errori più frequenti in cui vengono analizzate anche le motivazioni sia teoriche che psicologiche che li provocan
Evaluation of wave damage in urbanized lagoons
No full textOn the basis of the studies carried out for the Venice lagoon (Cecconi [4], M.A.V.-C.V.N. [9]), this work aims to set up an analytical method for the assessment, by means of proper indicators, of wave damages on both natural and artificial structures in urbanized lagoons. Recent field studies have revealed that wind and boats generated waves produce continuous actions on these structures that cause progressive damage (such as: loss of soil and vegetation from salt marshes and tidal flats; sedimentation in the channels; deterioration of timber piles and building foundations). Load and resistance parameters to be adopted for the calculation of the induced damages are affected by great uncertainties due to the stochastic nature of the wave forcings and the variability of mechanical characteristics of the different structures (caused by material factors and environmental conditions, such as biochemical activity and weather regime). In order to provide reliable estimations of the expected damages, a probabilistic approach that takes into account the large spatial and temporal variability of both load and resistance of the different structures is required. The proposed method starts with the definition of the failure mechanisms to be adopted for the structure in general terms and the estimation of the statistical parameters for the stochastic variables. Sensitivity analysis allows to assess the effects of different choices adopted in the overall modelling of waves and failure processes. The present study aims, in particular, at developing a reliable analytical instrument to support planning and regulation of motor-boat navigation and the design of protection systems against the erosion of natural and artificial structures in the Venice lagoon
Should we use early less invasive hemodynamic monitoring in unstable ICU patients?
No full textIn the previous issue of Critical Care, Takala and colleagues presented the results of a multicenter study to investigate whether the early presence of less invasive hemodynamic monitoring improves outcome in patients admitted with hemodynamic instability to the intensive care unit. The authors' results suggest that it makes no difference. We discuss these findings and compare them to the literature on early goal-directed therapy in which monitors are used early but with a protocol
Le lezioni-testimonianza. Analisi del contenuto
No full textNel contributo gli autori presentano i risultati dell'analisi del contenuto effettuata sul corpus testuale accumulato con i testi delle trascrizioni delle le lezioni-testimonianza e delle interviste. Il lavoro è stato condotto in una prima fase da coppie di ricercatori che hanno analizzato ciascuna un'area di contenuto (i tre quesiti alla base della ricerca): a) come apprendono i bambini; b) verso quali saperi sono orientati; c) con quali scelte didattiche. Laura Cerrocchi, Jovanka Rivi e Giusi Casasanta hanno scritto il par. 1 Come apprendono i bambini, pp.101-126, Antonio Gariboldi ha scritto il par. 2 I saperi verso cui gli insegnanti orientano i bambini, pp.126-143, Luciano Cecconi, dopo essersi confrontato con Paola Cagliari in merito all’analisi delle testimonianze sul tema “Le scelte didattiche degli operatori”, ha scritto il par. 3 "Le scelte didattiche degli operatori: contenuti e motivazioni", pp.144-184. Per quanto riguarda il par.1, nello specifico Laura Cerrocchi ha scritto il par. 1.3 per le voci: e, f, g, h, i, l, m e il par. 1.4. Jovanka Rivi ha scritto i parr.1 e 1.1 e il par. 1.2 per le voci a, b, c, d, e, f, g, h e i. Giusi Casasanta ha scritto il par. 1.2 per le voci l, m, n, o, p, q, r e il par. 1.3 per le voci a, b, c e d
«Le opere dei capri». Eugenio Cecconi, Teofilo Gay e la 'propaganda protestante' a Firenze (1874-1888)
No full text«Le opere dei capri». Eugenio Cecconi, Teofilo Gay e la 'propaganda protestante' a Firenze (1874-1888
Microstructural features of lime-stabilised pyroclastic soils
No full textSome results of an experimental investigation on a lime-stabilised Italian pyroclastic soil are presented
and discussed. This material is very reactive with calcium oxide (CaO) provided by the lime, the
effectiveness of the stabilisation mainly depending on the amount of low alkali alumino-silicate glass
phase. However, there is a lack of systematic studies on the suitability of such pyroclastic soils to lime
stabilisation and the effects of treatment parameters on the engineering properties of the stabilised
material. The results of laboratory tests (chemical, physical and mechanical) on untreated and limestabilised
samples allow an overview of the microstructural features of the material and, as a
consequence, on the suitability and effectiveness of lime stabilisation
Structural features and mechanical behaviour of a pyroclastic weak rock
No full textThe results of an extensive programme of laboratory testing on intact and reconstituted samples of a pyroclastic weak rock from the volcanic complex of the Colli Albani (Central Italy) are presented. The deposit is known as Pozzolana Nera and may be assimilated to a bonded coarse grained material. The nature
of bonds and the micro-structural features were examined by means of diffractometry, optical and electron microscopy. As bonds are made of the same constituents of grains and aggregates of grains, bond deterioration and particles breakage upon loading are indistinguishable features of the mechanical behaviour. The testing programme consisted mainly of one-dimensional and drained and undrained triaxial compression tests in a wide range of confining pressures up to 58 MPa. As confining stress increases, the mechanical behaviour of the material changes from brittle and dilatant to ductile and contractant; for both brittle and ductile behaviour failure is associated with the formation of shear surfaces separating the sample in several parts at the end of test. The experimental stress-dilatancy relationships are compared with the
classical stress-dilatancy theories for a purely frictional material and for a material with friction and cohesion between particles. The analysis of the data indicates that peak strength results from the interplay between degradation of inter-particle bonds, increasing friction between particles and increasing rate of
dilation
Geotechnical properties of lime stabilised pyroclastic soils
No full textIn the paper, some results of an extensive experimental investigation on lime stabilised Italian pyroclastic soils are presented and discussed. In their natural state, these materials present several complexities, starting with their mechanical behavior which is often at the transition between hard soils and weak rocks. These soils are very reactive with calcium oxide (CaO) provided by lime, the effectiveness of the stabilisation mainly depending on the amount of low alkali allumino-silicate glass phase. Nevertheless there is a lack of systematic studies on the suitability of pyroclastic soils to lime stabilisation, and the effects of the treatment parameters on the engineering properties of the stabilised material. Two pyroclastic soils have been considered in this study. The first is a sand with gravel belonging to a pyroclastic flow deposit of the Colli Albani volcanic complex, and the second is a silty sand originated by the late
activity of the Somma-Vesuvius. The results on natural and lime stabilised samples allow to assess the suitability and the effectiveness of lime stabilisation
New Technological Parameters in Buildings Project to Optimize Total Costs and Energy Efficiency
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