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Search Results: 1 - 10 of 401394 matches for " M. Verdecchia "
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$\mathcal{C}$-filtered modules and proper costratifying systems
O. Mendoza,M. I. Platzeck,M. Verdecchia
Mathematics , 2010, DOI: 10.1016/j.jalgebra.2011.09.015
Abstract: In this paper we define and study the notion of a proper costratifying system, which is a generalization of the so-called proper costandard modules to the context of stratifying systems. The proper costandard modules were defined by V. Dlab in his study of quasi-hereditary algebras (see \cite{Dlab}).
Artificial neural-network technique for precipitation nowcasting from satellite imagery
G. Rivolta, F. S. Marzano, E. Coppola,M. Verdecchia
Advances in Geosciences (ADGEO) , 2006,
Abstract: The term nowcasting reflects the need of timely and accurate predictions of risky situations related to the development of severe meteorological events. In this work the objective is the very short term prediction of the rainfall field from geostationary satellite imagery entirely based on neural network approach. The very short-time prediction (or nowcasting) process consists of two steps: first, the infrared radiance field measured from geostationary satellite (Meteosat 7) is projected ahead in time (30 min or 1 h); secondly, the projected radiances are used to estimate the rainfall field by means of a calibrated microwave-based combined algorithm. The methodology is discussed and its accuracy is quantified by means of error indicators. An application to a satellite observation of a rainfall event over Central Italy is finally shown and evaluated.
Coupling a distributed grid based hydrological model and MM5 meteorological model for flooding alert mapping
B. Tomassetti, E. Coppola, M. Verdecchia,G. Visconti
Advances in Geosciences (ADGEO) , 2005,
Abstract: The increased number of extreme rainfall events seems to be one of the common feature of climate change signal all over the world (Easterlin et al., 2000; Meehl et al., 2000). In the last few years a large number of floods caused by extreme meteorological events has been observed over the river basins of Mediterranean area and they mainly affected small basins (few hundreds until few thousands of square kilometres of drainage area) . A strategic goal of applied meteorology is now to try to predict with high spatial resolution the segments of drainage network where floods may occur. A possible way to reach this aim is the coupling of meteorological mesoscale model with high resolution hydrological model. In this work few case studies of observed floods in the Italian Mediterranean area will be presented. It is shown how a distributed hydrological model, using the precipitation fields predicted by MM5 meteorological model, is able to highlight the area where the major floods may occur.
Regional model simulation of the hydrometeorological effects of the Fucino Lake on the surrounding region
B. Tomassetti,F. Giorgi,M. Verdecchia,G. Visconti
Annales Geophysicae (ANGEO) , 2003,
Abstract: The drainage of the Fucino Lake of central Italy was completed in 1873, and this possibly caused significant climatic changes over the Fucino basin. In this paper we discuss a set of short-term triple-nested regional model simulations of the meteorological effects of the Fucino Lake on the surrounding region. We find that the model simulates realistic lake-breeze circulations and their response to background winds. The simulations indicate that the lake affects the temperature of the surrounding basin in all seasons and precipitation in the cold season, when cyclonic perturbations move across the region. Some effects of the lake also extend over areas quite far from the Fucino basin. Our results support the hypothesis that the drainage of the lake might have significantly affected the climate of the lake basin. However, longer simulations and further development in some aspects of the model are needed, in order to provide a more statistically robust evaluation of the simulated lake-effects. Key words. Hydrology (anthropogenic effects) – Meteorology and atmospheric dynamics (climatology; mesoscale meteorology)
New Frontiers in the Neoadjuvant Therapy of Pancreatic Adenocarcinoma: Apart from Therapeutical Protocols
Berardi R,Verdecchia L,Scartozzi M,Cascinu S
JOP Journal of the Pancreas , 2005,
Abstract:
Satellite radiometric remote sensing of rainfall fields: multi-sensor retrieval techniques at geostationary scale
F. S. Marzano, D. Cimini, E. Coppola, M. Verdecchia, V. Levizzani, F. Tapiador,J. F. Turk
Advances in Geosciences (ADGEO) , 2005,
Abstract: The Microwave Infrared Combined Rainfall Algorithm (MICRA) consists in a statistical integration method using the satellite microwave-based rain-rate estimates, assumed to be accurate enough, to calibrate spaceborne infrared measurements on limited sub-regions and time windows. Rainfall retrieval is pursued at the space-time scale of typical geostationary observations, that is at a spatial resolution of few kilometers and a repetition period of few tens of minutes. The actual implementation is explained, although the basic concepts of MICRA are very general and the method is easy to be extended for considering innovative statistical techniques or measurements from additional space-borne platforms. In order to demonstrate the potentiality of MICRA, case studies over central Italy are also discussed. Finally, preliminary results of MICRA validation by ground based remote and in situ measurements are shown and a comparison with a Neural Network (NN) based technique is briefly illustrated.
Thermally driven circulation in a region of complex topography: comparison of wind-profiling radar measurements and MM5 numerical predictions
L. Bianco, B. Tomassetti, E. Coppola, A. Fracassi, M. Verdecchia,G. Visconti
Annales Geophysicae (ANGEO) , 2006,
Abstract: The diurnal variation of regional wind patterns in the complex terrain of Central Italy was investigated for summer fair-weather conditions and winter time periods using a radar wind profiler. The profiler is located on a site where interaction between the complex topography and land-surface produces a variety of thermally and dynamically driven wind systems. The observational data set, collected for a period of one year, was used first to describe the diurnal evolution of thermal driven winds, second to validate the Mesoscale Model 5 (MM5) that is a three-dimensional numerical model. This type of analysis was focused on the near-surface wind observation, since thermally driven winds occur in the lower atmosphere. According to the valley wind theory expectations, the site – located on the left sidewall of the valley (looking up valley) – experiences a clockwise turning with time. Same characteristics in the behavior were established in both the experimental and numerical results. Because the thermally driven flows can have some depth and may be influenced mainly by model errors, as a third step the analysis focuses on a subset of cases to explore four different MM5 Planetary Boundary Layer (PBL) parameterizations. The reason is to test how the results are sensitive to the selected PBL parameterization, and to identify the better parameterization if it is possible. For this purpose we analysed the MM5 output for the whole PBL levels. The chosen PBL parameterizations are: 1) Gayno-Seaman; 2) Medium-Range Forecast; 3) Mellor-Yamada scheme as used in the ETA model; and 4) Blackadar. Full Article (PDF, 1562 KB) Citation: Bianco, L., Tomassetti, B., Coppola, E., Fracassi, A., Verdecchia, M., and Visconti, G.: Thermally driven circulation in a region of complex topography: comparison of wind-profiling radar measurements and MM5 numerical predictions, Ann. Geophys., 24, 1537-1549, doi:10.5194/angeo-24-1537-2006, 2006. Bibtex EndNote Reference Manager XML
Geoquímica y procedencia de los metasedimentos ordovícicos del complejo metamórfico La Cébila, provincia de La Rioja, Argentina
Verdecchia, Sebastián O.;Baldo, Edgardo G.;
Revista mexicana de ciencias geológicas , 2010,
Abstract: the famatinian orogenic belt of early palaeozoic age (late cambrian to middle ordovician) represents part of the gondwana southwestern paleo-margin evolution within the pre-andean basement of central-western argentina. this belt is composed of igneous rocks with arc signature, a sedimentary succession of marine and volcaniclastic origin and low- to medium-pressure metamorphic units. one of such units is the la cébila metamorphic complex (lcmc, early to middle ordovician), which includes low- to high-grade metasedimentary successions composed mainly of phyllosilicate-rich (phyllite, mica schists and migmatites) and quartz-feldspar-rich (metapsammite, quartz-mica schists and quartzites) rock types. the current geochemical signal of metasediments from lcmc allows comparing them with at least three primary compositions referring to pelitic, psammites and quartz-psammites lithology types. this suggests that the protolith composition was not substantially altered during the metamorphic event. low la/th ratios (2.4-4.5; n = 7) and hf contents (3.5-11.0; n = 7) , in addition to the absence of detrital zircon ages from the famatinian volcanic arc (located to the west), suggest a provenance from a source area of felsic composition, consistent with the pampean basement (early cambrian to middle cambrian) located to the east (current coordinates). the metasediments from the lcmc are geochemically equivalent to those of the puncoviscana formation (late neoproterozoic - early cambrian), showing minimal differences only in the content of some immobile (e.g., zr and ti) and mobile (e.g., k, sr and rb) elements. consequently, major and trace elements are not reliable to differentiate between these two metasedimentary successions.
Un método para determinar la calidad de la información del registro del cáncer A method for ascertaining the quality of cancer registry data
Arduino Verdecchia,Roberta De Angelis,Silvia Franceschi
Revista Cubana de Salud Pública , 2004,
Abstract: Los métodos que habitualmente se utilizan para evaluar el completamiento y la calidad de las informaciones del Registro del Cáncer comprenden indicadores sencillos e indirectos como son la proporción de casos con certificados de defunción (casos DCO), la proporción de casos con confirmación microscópica, la relación incidencia-mortalidad, etc. Se propone en este trabajo la modelación de la incidencia del cáncer, la mortalidad y la supervivencia en un marco unificado como método adecuado para chequear la consistencia de las informaciones del Registro del Cáncer con un proceso que se cierra solo cuando los datos sobre mortalidad, incidencia y supervivencia del paciente son completos y tienen una gran calidad. El método MIAMOD se desarrolló para brindar estimados y proyecciones referidos a la incidencia, prevalencia y mortalidad, utilizando la información sobre mortalidad y supervivencia de los pacientes a nivel nacional o regional. Se ofrecen ejemplos de la aplicación del método MIAMOD en los registros nacionales del cáncer en Europa para mostrar el comportamiento del método en la revisión de las informaciones del Registro del Cáncer en lo que respecta a la consistencia interna y el completamiento de la información. Proponemos el método y el software MIAMOD como una herramienta útil para chequear el completamiento y la calidad de las mencionadas informaciones y para brindar información futura sobre el peso del cáncer en los planes de salud y en la asignación de recursos para esta esfera Methods commonly used to evaluate completeness and quality of CR data involve simple and indirect indicators such as the proportion of DCO cases, the proportion of cases with microscopic confirmation, the incidence to mortality ratio, etc. Modelling cancer incidence, mortality and survival in a unified framework is proposed as an appropriate approach to check for consistency CR data with a process that turns out to be circular if, and only if, mortality, incidence and patients’ survival data are high quality and complete. The MIAMOD method was developed to provide incidence, prevalence and mortality estimates and projections, using mortality and patients’ survival information at national or regional levels. Examples of application of the MIAMOD method to national cancer registries in Europe are given to show the performance of the method in checking the CR data for internal consistency and completeness of registration. We are proposing the MIAMOD method and software as a tool for CR useful to check for completeness and quality of their data and to provide future cancer bur
On the existence and construction of proper costratifying systems
Octavio Mendoza,Maria Inés Platzeck,Melina Verdecchia
Mathematics , 2011,
Abstract: In this paper we further study the notion of proper costratifying systems, defined in \cite{MPV}. We give sufficient conditions for their existence, and investigate the relation between the stratifying systems defined by K. Erdmann and C. S\'aenz in \cite{ES} with the proper costratifying systems.
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