423 research outputs found
Alerta bibliográfica y formación continuada: el Boletín Bibliográfico CESCA
No full textThe objective of this work is to analyze the quantity and quality of the comments included in CESCA Bibliography Bulletin and to study the usefulness of the Bulletin to its subscribers. We review the 1991 Bulletin and develop a postal survey to its suscribers. Papers from journals are 92 % of the total; they come from 90 different journals; 13 % of the journals give 55 % of the corhments. The clinical topics are the more frequent (29 %), being the health services research the second topic (29 %). There were 5 % of errors. Subscribers used the Bulletin as a source of information about new publications and as a tool for continuous medical education. CESCA Bibliography Bulletin is a useful publication which helps in following new publications and continuous medical education.El objetivo de este trabajo es analizar el contenido y calidad de los comentarios incluidos en el Boletín Bibliográfico CESCA, así como su utilidad para los suscriptores del mismo. Se realiza un estudio descriptivo de lo publicado en 1991 y se analizan las respuestas a una encuesta remitida a los suscriptores. Los artículos de revistas constituyeron el 92 % de todos los comentarios; se utilizaron 90 revistas distintas; 13 revistas concentran el 55 % del total de los comentarios. La temática más frecuente de los documentos comentados fue la clínica (39 %), seguida de la investigación de servicios sanitarios (29 %). Se ha encontrado un 5 % de errores. Los suscriptores emplearon el Boletín como alerta bibliográfica y como soporte de formación continuada. Así pues, el Boletín Bibliográfico CESCA, que comenta y califica los documentos, es una ayuda para los lectores, tanto en alerta bibliográfica como en formación continuada
Field and laboratory investigations of runout distances of debris flows in the Dolomites (Eastern Italian Alps)
No full textThe estimation of runout distances on fans has a major role in assessing debris-flow hazards. Different methods
have been devised for this purpose: volume balance, limiting topographic methods, empirical equations, and
physical approaches. Data collected from field observations are the basis for developing, testing, and improving
predictive methods, while laboratory tests on small-scale models are another suitable approach for studying
debris-flow runout under controlled conditions and for developing predictive equations. This paper analyses the
problemof assessing runout distance, focusing on six debris flows thatwere triggered on July 5th, 2006 by intense
rainfall near Cortina d'Ampezzo (Dolomites, north-eastern Italy). Detailed field surveys were carried out
immediately after the event in the triggering zone, along the channels, and in the deposition areas. A fine-scale
digital terrain model of the study area was established by aerial LiDAR measurements. Total travel and runout
distances on fansmeasured inthe fieldwere comparedwith the results of formulae fromthe literature (empirical/
statistical and physically oriented), and samples of sediment collected from deposition lobes were used for
laboratory tests. The experimental device employed in the tests consists of a tilting flumewith an inclination from
0° to 38°, onwhich a steel tank with a removable gate was installed at variable distances from the outlet. A final
horizontal planeworks as the deposition area. Samples of different volumes and variable sediment concentrations
were tested. Multiple regression analysis was used to assess the length of the deposits as a function of both the
potential energy of the mass and the sediment concentration of the flow. Our comparison of the results of
laboratory testswith field data suggests that an energy-based runout formula might predict the runout distances
of debris flows in the Dolomites
Semeiotica neurologica nei piccoli animali (1° parte). Neuroanatomia funzionale e reazioni posturali.
No full text
Studio dei meccanismi di deposizione dei Debris Flow: integrazioni tra esperienze di laboratorio, analisi di campo e modellazioni numeriche
No full textThis research is related to the study and modelling of the depositional processes of debris flows and an understanding of the related rheological behaviour. The main aims of this study are to analyse the depositional features of a debris flow, to verify the possible contribution of laboratory tests, carried out by means of a tilting-plane rheometer, to determine the rheological parameters and to investigate the reliability and limitations of computer models employed for debris flow simulation and rheological parameter determination.
The laboratory tests were been carried out at the Institute for Hydrological and Geological Protection of the Italian National Research Council (CNR IRPI) in Padova. The physical model consists of a 2 x 1 m tilting plane with inclination from 0° to 38°, on which a steel tank with a removable gate has been installed. A fixed horizontal plane (1.5 x 1 m), with an artificial roughness to simulate natural basal friction, served as the deposition area. In total, 93 laboratory tests were carried out: 62 tests simulated the quasi-static formation of a fan (with the tank installed at the lower end of the tilting plane), the remaining 31 examined dynamic fan formation by the means of a flume. The steel tank, with a removable gate facing the deposition plane, is parallelepiped with a square base (15 x 15 cm and 33 cm high) having a maximum volume of 7 dm3. The laboratory tests were conducted using three different materials: plastic cylinders with a diameter and height of 3 mm; medium to fine gravel; and debris-flow matrix (with a diameter < 19 mm), varying amounts of water were added to the debris-flow matrix to test solid concentrations in a range between 0.45 and 0.67. Data analysis included the development of semi-empirical equations for runout distance, the maximum width of the deposit and total travel distance. An energy balance approach was tested in order to determinate the rheological parameters of the debris-flow matrix, this method is based on the comparison between the potential energy of the mass stored in the tank and the work made in the process of deposit formation.
The field sites related to the debris-flow events are located upstream of the town of Cortina d'Ampezzo (Fiames locality, Belluno, Italy), where an intense rainstorm triggered six debris flows during the afternoon of 5th July 2006. Immediately following the event, field surveys were carried out in the study area. These field surveys made it possible to measure several features, including the debris-flow deposits, main channels and initiation areas. Samples taken from the debris-flow deposits have been used for laboratory tests. Total travel distances and the runout distance on fans measured in the field were compared with formulas found in the literature (empirical/statistical and physically oriented) and also compared to the results of the laboratory tests. An estimation of shear stress from the field site was calculated using Johnson's (1970) formula.
The Fiames debris-flow event of 5th July 2006 and the laboratory tests (dynamic runs) were simulated using FLO-2D, while RAMMS (Rapid Mass MovementS) was used solely to simulate the Fiames event. FLO-2D (O'Brien, 2003) is a two-dimensional flood routing model with a rigid bed (debris-flow simulations) or a mobile bed (sediment transport simulations), it simulates water flows in wide rivers as well as non-Newtonian flows over alluvial fans. FLO-2D numerically routes a flood hydrograph while predicting the area of inundation, the maximum depth and the flow velocity in each cell of the square grid system derived from input topographic data. RAMMS was developed in 2005 by the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf and the Swiss Federal Institute for Snow and Avalanche Research (SLF), Davos. RAMMS uses a one-phase approach based on Voellmy rheology (Voellmy, 1955; Salm et al. 1990). The input file combines the total volume of the debris flow located in a release area with a mean depth. The model predicts the area of inundation, the maximum depth and the flow velocity in each triangular-shape cell of the input DTM.
The limitations of the numerical simulations relating to the laboratory tests were investigated to verify to what extent rheological parameters could be determined using this indirect method. The analysis of the Fiames event enabled understanding of the rheological behaviour related to the dolomitic debris-flows and the influence exerted by the input parameters on the final results. Finally, some improvements to the RAMMS model were proposed to obtain simulations in keeping with the events observed in the field
Earthquake catalogs for: Improving detection of micro-earthquakes in the Val d'Agri region (Southern Italy) using Deep Learning algorithms
No full textThis repository contains two earthquake catalogs (dubbed PRN and QS) obtained from the application of two deep-learning-based detection workflows to continuous seismic data recorded in the Val d’Agri region (Southern Italy). These catalogs have been generated using the PhaseNet neural network for seismic phase picking (Zhu & Beroza, 2019). The workflows used to generate the catalogs are described in detail in: Caredda et al. (2025). These datasets offer a more comprehensive representation of local seismicity compared to manually generated, STA/LTA-based catalogs (available in the open periodic monitoring reports accessible at: https://cms.ingv.it/sperimentazioni/val-d-agri [last accessed on 18/09/2025]).
The datasets include event origin times, locations, magnitudes, location uncertainties, and phase arrival times with corresponding PhaseNet “pick probabilities” (for the PRN catalog), providing an enriched representation of local seismicity compared to conventional STA/LTA-based catalogs.
These catalogs can serve as valuable resources for further research on seismicity, induced processes, Earth structure, and seismic hazard assessment in the Val d’Agri region.
References:
Caredda, E., M.P. Isken, S. Cesca, M. Errico, G. Zerbinato, and A. Morelli (2025) Improving detection of micro-earthquakes in the Val d’Agri region (Southern Italy) using deep learning algorithms, Seismica (in press).
Zhu, W., and Beroza, G. C. (2018). PhaseNet: A Deep-Neural-Network-Based Seismic Arrival Time Picking Method. Geophysical Journal International, 216(1), 261–273. https://doi.org/10.1093/gji/ggy42
Tuning the linear and nonlinear optical properties of ordered plasmonic nanoarrays by morphological control with thermal annealing
No full textThe capability to tune the linear and nonlinear optical response of plasmonic nanoarrays is of great interest for the realization of solid-state plasmonic nanodevices with application in many different fields in nanophotonics.
In the present work we demonstrated the possibility to tailor, in a controlled way, the morphological properties of gold nanoprism arrays fabricated by nanosphere lithography, by performing thermal annealing treatments in
air, preserving their bidimensional ordered arrangement. This allows to engineer the linear optical properties of the samples, finely tuning the spectral position and amplitude of their surface plasmon resonance peak.
Moreover, we demonstrated that the fine control of the nanostructures' morphology provides a way to get the continuous modulation of the nonlinear optical parameters (nonlinear refractive index and nonlinear absorption
coefficient) of the nanoarray. The experimental findings have been supported by finite elements method electrodynamic simulations, which provided a very good agreement
Principii di pedagogia generale, par M. Giovanni Cesca, professeur titulaire d’histoire de la philosophie et chargé du cours de pédagogie à l’Université de Messine. Turin, Rome, Milan, Florence, Naples, Paravia, 1900
No full textDejob Charles. Principii di pedagogia generale, par M. Giovanni Cesca, professeur titulaire d’histoire de la philosophie et chargé du cours de pédagogie à l’Université de Messine. Turin, Rome, Milan, Florence, Naples, Paravia, 1900. In: La revue pédagogique, tome 38, Janvier-Juin 1901. pp. 408-409
Reologia e distanza di arresto dei debris flow: sperimentazioni su modello fisico a piccola scala
No full textLo studio di campo delle caratteristiche di movimento delle colate fangose e fangoso-detritiche
(debris flow) presenta delle notevoli difficoltà tecniche e operative a causa dell’imprevedibilità temporale del fenomeno, della sua breve durata e dell’elevata forza
distruttiva del flusso. Per questa ragione l’uso di modelli fisici a scala ridotta può considerarsi un valido strumento di indagine per l’analisi reologica dei debris flow o
quanto meno della loro componente medio-fine (ghiaie, sabbie, limi, argille), che ne condiziona fortemente gli sforzi deformativi di tipo viscoso, frizionale e collisionale. In questo ambito si sono svolte alcune prove sperimentali mediante un reometro a piano inclinato, costituito da una canaletta, lunga 2 m, seguita da un piano orizzontale che
funge da zona di deposizione. La canaletta è dotata di un serbatoio per il carico delle miscele fangoso-granulari, dal quale vengono poi rilasciati impulsivamente, a mezzo di
una paratoia, flussi a concentrazione volumetrica nota. Sono state testate alcune miscele costituite da sedimenti campionati da recenti depositi di colata: due campioni
(uno indisturbato ed uno rimaneggiato) provengono da un debris flow verificatosi in zona Dolomitica (falde del massiccio del Pomagagnòn, Cortina d’Ampezzo, Belluno) e
sono caratterizzati da diverse percentuali dei sedimenti coesivi, un terzo campione è composto da materiale prevalentemente sabbioso prelevato dalla colata del rio
Gabbiolo (affluente del torrente Sarca di Val Genova, Trento), un ultimo campione (rio Val degli Schivi, Trento) presenta un discreto assortimento di sedimenti a grana grossa e a grana fine. Le prove sperimentali hanno portato a determinare delle relazioni piuttosto strette tra la pendenza media di attrito dei vari flussi gravitativi e la loro
concentrazione volumetrica, mettendo in luce come la composizione granulometrica dei sedimenti ne influenzi grandemente la mobilità. Le sperimentazioni hanno inoltre
suggerito un metodo per la stima della distanza di arresto, che è stato verificato mediante il confronto con eventi reali
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