1,720,966 research outputs found
Stima dell'evoluzione del trasporto solido in fognatura
No full textLa definizione e l’uso di efficienti e rapidi strumenti simulativi in grado di prevedere l’evoluzione dello stato e della funzionalità degli elementi di una rete fognaria con un grado di approssimazione sufficientemente elevato da permetterne l’utilizzo all’interno di un programma di pianificazione della manutenzione risulta di notevole rilievo vista la crescente importanza che la gestione delle reti ha assunto nel quadro normativo italiano. La deposizione e l’accumulo di solidi di diversa natura sul fondo dei condotti fognari costituisce uno dei principali problemi per il corretto funzionamento di un sistema fognario inserito in un più ampio sistema idrico integrato.
L’obiettivo del modello proposto è quello di individuare un procedimento simulativo del trasporto solido che costituisca un valido compromesso tra affidabilità dei risultati e velocità di elaborazione e che sfrutti la capacità di previsione di formulazioni sperimentali tra le più diffuse nella recente letteratura
Transport of solid material in sewer pipe - the sample catchment of Cesarina (Rome)
No full textProblems related to the impact of storm waters in the final outlet for urban sewer pipes have been studied thanks to the analysis conducted in an experimental sample basin drained by a combined sewer network, located in the city of Rome (S = 2015 ha); the chosen basin is the Cesarina - San Basilio catchment, situated in an area east of the centre of Rome, on the right side of the river Aniene. The aim of these measurements is the qualitative and quantitative characterisation of load waves occurring in the main sewer pipe during a storm event, as well as the analysis of erosion and transport of deposited solid material and the location of sewer trunks with high probability of temporary solid deposits between two consecutive storm waves. The complexity of solid transport phenomena implied the need for simplified analysis schemes and simulative models appropriately calibrated with experimental data, suitable for a technical solution of such problems. In particular, the validity of experimental records allows the calibration of a hydrodynamic model whose implementation facilitates the extension of data from a sewer trunk of the network to another. In the hydraulic model, a flow simulation engine has been used to solve the complete De Saint Venant equation under the hypothesis of mono-dimensional flow, and to represent full-section flow, pipe storage capacity, gushing-back phenomena, inlet and outlet energy losses and flow inversion. The paper reports on the main criteria on which the project and the realisation of the monitoring system are based, as well as the first experimental data collected. These records allowed a first calibration of a model for the sewer system created to favour the extrapolation of such data to the main network trunks
Sediment Transport in Sewers: The Cesarina Combined Sewer Network
Full text linkThe polluting effects of storm water runoff on the receiving waterbodies
represent an increasingly relevant problem in developing urban areas. In
combined sewer pipes, transiting flood waves cause the alternation of sediment
erosion and deposition of the solid material transported by the flow. Combined
sewer deposit, mainly generated as an effect of such phenomena during the dry
weather period between two rain events, is generally a mix of sand and highly
polluting materials. Accumulation of sediments along a combined sewer network
is often the cause of dysfunctions in the drainage system itself and negative
impacts on the quality of receiving waters, due to the resuspension and overflow
of pollutants. Both aspects have been investigated for the combined sewer of
Rome thanks to an experimental catchment of about 2800 ha in the Cesarina –
S. Basilio area. Based on the simulations conducted, structural solutions were
proposed and evaluated, aimed at reducing the operational and environmental
problems related to sewer sediment. The results show noticeable margins for the
optimisation of the whole sewer system and for the reduction of its
environmental impact
Problematiche relative all'impatto allo scarico delle acque pluviali
No full textLe problematiche connesse con l’impatto allo scarico delle acque pluviali sono affrontate con l’ausilio di un bacino sperimentale situato nella zona Est del Comune di Roma di estensione pari a circa 2015 ettari.
L’attività sperimentale in corso è rivolta sia a localizzare e caratterizzare a livello quali – quantitativo i depositi all’interno della rete sia ad individuare un modello del trasporto solido che consenta di individuare i tronchi ad elevata probabilità di de-posito e di valutare l’ordine di grandezza dei volumi depositati.
Nella nota si descrive il bacino sperimentale della Cesarina presentando i primi risultati delle analisi quali - quantitative e del modello di trasporto
The development of Integrated Real Time Control to optimise storm water management for the combined sewer system of Rome
Full text linkIncreasing urbanisation and intensification of human activities are common
trends all over the world. The higher portion of impermeable urban surfaces
often leads to well known effects on storm water runoff and its polluting
potential for receiving waters. Despite the variety of structural solutions and
management practices proposed to mitigate the operational and environmental
impact of urban runoff, their application on existing drainage systems can often
be either ineffective at a metropolitan scale or unfeasible for a densely urbanised
territory. Among all the proposed alternatives, the real time control (RTC) of
drainage systems is proving more and more promising to dynamically regulate
the system capacity in response to intense rainfall. The combined sewer network
of Rome, historically built with high-capacity pipes to collect storm water from
both urban and natural catchments, holds significant potential for RTC of online
storage and combined sewer overflows, to optimise the global drainage capacity
and reduce the impact of discharges on local river quality. To assess the real
benefits, the potential limits and the feasibility of such a system for the city
sewers, a pilot study has been conducted on a 3,000 hectare sub-catchment. It
involved the development of a fast-response hydrodynamic simulation tool for
the sewer network, the definition and evaluation of RTC strategies and the
implementation of an environmental integrated telemetry system. As described
here, the study has highlighted significant margins for the optimisation of the
global network capacity without any major interventions on the physical assets,
as well as some critical issues to solve for a fully operational RTC application
il sistema acquedottistico dell'ATO2 Lazio Centrale Roma
No full textIl sistema acquedottistico dell’ATO2 Lazio Centrale Roma, uno dei più grandi d’Europa, è caratterizzato da avere grandi acquedotti che consentono l’approvvigionamento da fonti di eccellente qualità situate a grande distanza dalla cit-tà, in linea con l’antica tradizione acquedottistica dei Romani. Accurati controlli analitici assicurano la qualità dell’acqua.
Un sistema di adduzione costituito da grandi condotte in pressione che collegano i numerosi centri idrici consente di smistare la risorsa idrica ove necessario ed evitare o limitare disservizi in caso di fuori servizio di uno degli acquedotti.
I grandi acquedotti assicurano anche l’approvvigionamento idrico a circa 100 comuni della Citta Metropolitana.
Il gestore Aceaato2 sta applicando le più moderne tecnologie nella gestione per migliorare e rendere più efficiente il servizio, prima fra tutte il Work Force Management che consente di utilizzare al meglio la forza lavoro
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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