1,721,184 research outputs found
A statistical definition of an equivalent stress amplitude for multiaxial random loadings
No full text
Turismo sostenibile: la rappresentazione sociale nei giovani
No full textIl turismo sostenibile, inteso come fenomeno che non ritiene le risorse ambientali né illimitate né rinnovabili, propone una nuova impostazione dei rapporti tra turismo e ambiente. Il presente contributo propone una ricerca condotta su un campione di studenti universitari di Padova che indaga il turismo sostenibile in termini di rappresentazione sociale. In base alla metodologia proposta da Le Bouedec sono distinte tre componenti: l’informazione (l’insieme delle conoscenze e delle opinioni relative al turismo sostenibile), il campo di rappresentazione (la struttura delle relazioni di somiglianza o di differenza tra i concetti associati all’oggetto), l’atteggiamento (disposizione affettiva nei confronti dell’oggetto). Per indagare quest’ultima componente si è ricorsi al differenziale semantico.
I dati discussi sono riferiti ai 14 concetti o unità lessicali individuati nella prima fase dell’indagine. In sintesi, la rappresentazione di turismo sostenibile presente nei giovani interpellati è positiva anche se sembra ancora una forma turistica legata alla moda, alla novità che può diventare una possibile fonte di business, piuttosto che un modo diverso di considerare il fenomeno turistico nel suo complesso e di programmarne lo sviluppo
Computer-aided durability analysis of complex structures under multiaxial random loadings through the Projection-by-Projection spectral method
No full textThis letter deals with a set of numerical case studies that were devised as mean to help users in implementing the Projection‐by‐Projection (PbP) multiaxial spectral criterion. A first case study scrutinised the PbP method applied to different types of biaxial random stress and material fatigue properties. A second
case study investigated a structure under random excitations and provided practical guidelines on how to implement the PbP method for a computeraided durability analysis
Airborne pollen biodiversity: changes in 30 years of data at San Michele all’Adige (North Italy)
No full textPollen viability as bioindicator of air pollution: state of the art and future perspectives
No full textPolliniTrentino: informazione pollini in digitale per migliorare la qualità di vita dei cittadini allergici: relazione finale
Full text linkAirborne bioparticles and speleotherapy: a case study in a disused mine of siderite (Brescia, Italy)
No full textA frequency-domain formulation of MCE method for multiaxial random loadings
No full textMany multi-axial fatigue limit criteria are formalized as a linear combination of a shear stress amplitude and a normal stress. To identify the shear stress amplitude, appropriate conventional definitions, as the minimum circumscribed circle (MCC) or ellipse (MCE) proposals, are in use. Despite computational improvements, deterministic algorithms implementing the MCC/MCE methods are exceptionally time-demanding when applied to “coiled” random loading paths resulting from in-service multi-axial loadings and they may also provide insufficiently robust and reliable results. It would be then preferable to characterize multi-axial random loadings by statistical re-formulations of the deterministic MCC/MCE methods. Following an early work of Pitoiset et al., this paper presents a statistical re-formulation for the MCE method. Numerical simulations are used to compare both statistical re-formulations with their deterministic counterparts. The observed general good trend, with some better performance of the statistical approach, confirms the validity, reliability and robustness of the proposed formulation
Rare occurrence of airborne bioparticles in a speleotherapy site: the case study of the Sant’Aloisio disused siderite mine (Brescia, Italy)
No full textCaves and mines have a suitable microclimate in terms of temperature, humidity and air purity that could be exploited for speleotherapy. The aim of this study was to evaluate the current load of allergenic airborne bioparticles of a subterranean environment being considered as a potential site for treating respiratory allergies. Sampling was performed over 12 months (2015–2016) inside and outside the Sant'Aloisio mine by: (i) continuous aerobiological sampling with Hirst-type samplers and (ii) monthly air sampling with an on-plate volumetric sampler using three different selective culture media. The following protocols were applied for the two methodologies: (i) Samples were processed following the European standard (UNI CEN/TS 16868:2015) and analyzed by light microscopy to identify and count pollen grains and fungal spores; (ii) plates were incubated, colony-forming units (CFU) were counted and concentration of CFU was calculated. Spore and pollen load, as evaluated by the continuous monitoring, resulted in very low values inside the mine, with a total of 106 pollen grains and 41 fungal spores from two species (Alternaria and Cladosporium) collected over the entire year; the pollen and spore concentration in the subterranean environment was negligible when compared to the open-air sampling (0.2% for pollen; 0.02% for spores). Viable airborne microorganisms were less represented in the mine than in the open air (median: 7 and 83 CFU*m−3, respectively). The indoor air of the disused mine was confirmed to be suitable for hosting respiratory disease sufferers from an aerobiological point of view. The residual low quantity of pollen grains could be the result of unintentional human transport. The indoor fungal component of the viable airborne microorganisms was mostly derived from non-allergenic wood-decaying fung
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