1,720,998 research outputs found
Impatto di un rilevato in golena sui livelli di piena del fiume Ticino a Bereguardo
No full textNella presente nota sono riportati i risultati di uno studio volto a valutare l'influenza dell'attraversamento della valle del fiume Ticino da parte dell'autostrada dei fiori MI-GE, parzialmente realizzato su terrapieno, sui livelli idrici del fiume in condizioni di piena. Lo studio è stato affrontato mediante modellazione matematica bidimensionale. L'influenza dell'opera è stata valutata simulando, in presenza ed in assenza del rilevato, il campo idrodinamico conseguente ad una piena centenaria in ingresso al tronco fluviale. si è così potuto giungere ad una definizione quantitativa degli innalzamenti dei livelli idrici a monte del rilevato. E' stata poi effettuata un'ulteriore simulazione per valutare i benefici ottenibili con alcune modifiche dell'opera
Treatment of advanced/metastatic colorectal carcinoma with capecitabine : a single institution experience
No full text
Mixing and transport processes in environmental flows
No full text“Dilution is the Solution to Pollution”. This is a well-known English motto and this is why environmental flows characterized by dilution and mixing processes are of great interest for scientists. These notes show the present scenario of pollution and warning of our planet, a general analysis of miscible and non-miscible flows with a classification based on fundamental parameters. Successively, a theoretical analysis and experimental results of some case studies of jets in a wave environment and jets interacting with a vegetated crossflow current are presented. The potential help of field measurements and monitoring and the use of new technologies based on satellite images are also briefly described, with some case studies of our research team.
The notes show that the deeper knowledge of these complex environmental flows should be pursued for research, technical and engineering interests. Because of the increasing stress placed on water resources throughout the world, a resurgence and reinvention of hydraulic engineering should be considered, in the belief that Hydraulic research will be more and more a cooperation with other experts and that researchers must respond to the need to manage and protect natural resources. Considering all these aspects, the old motto with which this summary starts, could be changed to: “Dilution is (not always) the Solution to Pollution”
1923 Gleno dam break: case study and numerical modeling
No full textOn the morning of December 1, 1923, the Gleno Dam (located in the Central Italian Alps) suddenly collapsed a few days after the first complete reservoir filling. Nearly 4.5×106 m3 of water was released. The consequent inundation caused significant destruction along the downstream valley and a death toll of at least 356 lives. This failure is the only historical case of dam break caused by structural deficiencies that has occurred in Italy. As a result, it has deeply influenced the evolution of Italian regulations regarding dam design and hydraulic risk evaluation. However, in spite of its relevance, this event has never been characterized from a hydraulic standpoint. This paper reports the main information obtained from the analysis of a vast amount of historical documents regarding the Gleno Dam break to set up a case study useful for validating dam-break models in mountain settings. Moreover, it presents the main results of one-dimensional (1D) modeling of the dam break wave propagation accomplished with a first-order finite volume numerical scheme recently proposed in the literature for field applications. The overall effectiveness and reliability of the model are evaluated for this case characterized by very irregular topography. Finally, the practical relevance of several choices that the numerical reconstruction of this kind of event demands is tested
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
