1,720,963 research outputs found
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
La gestione dei rifiuti di un industria elettronica: proposta di ottimizzazione ambientale ed economica
No full textSediment transport in sewers
No full textSolid transport in combined sewers is characterized by a succession of two phenomena: erosion of sediment from the pipe bottom and deposition of solid matter transported by the flow during the sequential phases of a storm wave.
The alternation of these phenomena in a combined sewer network causes the deposition of sand and organic material during the time between two successive storm waves.
Dry weather flow generally can’t activate near-bed solids transport, so that the sediment remains in sewer trunks until the first storm flow occurs.
After long periods of permanence at the sewer pipe bottom, especially during summer, organic material can undergo a process of decomposition. In this case, wet weather flow created by the first storm event often causes erosion and transport of solid material in a decomposed state to the receiving aquatic systems, with the risk of anoxia.
This phenomenon is being analysed in two different hydrographic basins in Rome, with on-site monitoring of two combined sewer networks, whose dry weather flow and first storm flow, according to designed dilution ratios, is conveyed to the Roma Nord wastewater treatment plant and whose combined sewer overflow (CSO) spills are received by the river Aniene, one of the main tributaries of the river Tevere.
This experimental activity is aimed at both locating, characterizing and quantifying sediment deposits in such sewer networks, and defining a sediment transport model to predict the position of sewer trunks with high probability of deposit and to estimate mean values of sediment volume
La gestione dei rifiuti di un’industria elettronica. Proposta di ottimizzazione ambientale ed economica
No full textIl trasporto solido in fognatura: il bacino campione della Cesarina.
No full textLe problematiche connesse con l’impatto allo scarico delle acque pluviali per collettori urbani sono affrontate con l’ausilio di un bacino sperimentale drenato da un collettore di tipo misto della città di Roma (S = 2015 ha); il sistema fognario individuato è quello del Cesarina - San Basilio situato nella zona Est del Comune di Roma ed affluente in destra idraulica del fiume Aniene.
L’obiettivo delle misure è la caratterizzazione quali – quantitativa dell’onda di carico che si determina nel collettore a seguito di un evento di piena, le modalità con cui il materiale accumulatosi nella rete viene eroso e trasportato a recapito e l’individuazione dei tronchi di deposito temporaneo tra un’onda e la successiva.
La complessità dei fenomeni ha comportato la necessità di procedere con schemi semplificati individuando modelli approssimati, opportunamente tarati sui dati sperimentali, che possano risultare idonei ad una soluzione tecnica delle problematiche; in particolare, la valenza dei dati sperimentali raccolti ha consentito la taratura di un modello idrodinamico che implementato renderà più agevole il trasferimento delle informazioni da un tronco all’altro della rete.
Nella nota vengono presentati i criteri posti alla base del progetto e della realizzazione del sistema di misura nonché i primi risultati delle registrazioni che hanno consentito la taratura del modello di simulazione costruito per il sistema con l’obiettivo di rendere più facile l’estrapolazione dei dati ai vari tronchi del collettore
Technical-economical analysis of selected decentralized technologies for municipal wastewater treatment in the city of Rome
Full text linkSeveral wastewater treatment technologies were evaluated as alternative systems to the
more traditional centralized continuous flow system to serve decentralized areas of the city of Rome
(Italy). For instance, the following technologies were selected: (1) Constructed wetlands, (2)
Membrane Biological Reactor, (3) Deep Shaft, (4) Sequencing Batch Reactor, and (5) Combined
Filtration and UV-disinfection. Such systems were distinguished based on the limits they are
potentially capable of accomplishing on the effluent. Consequently, the SBR and DS were grouped
together for their capability to comply with the standards for the discharge into surface waters
(according to the Italian D.Lgs. 152/06, Table 1, All. 5), whereas the MBR and tertiary system
(Filtration+UVc-disinfection) were considered together as they should be able to allow effluent
discharge into soil (according to the Italian D.Lgs. 152/06, Table 4, All. 5) and/or reuse (according to
the Italian D.M. 185/03). Both groups of technologies were evaluated in comparison with the more
common continuous flow treatment sequence consisting of a biological activated sludge tank followed
by the secondary settlement, with final chlorination. CWs were studied separately as a solution for
decentralized urban areas with limited population.
After the analysis of the main technical features, an economical estimate was carried out taking into
account the investment, operation and maintenance costs as a function of the plant's capacity. The
analysis was based on real data provided by the Company who manages the entire water system of the
City of Rome (Acea Ato 2 S.p.A.). A preliminary design of the treatment plants using some of the
selected technologies was finally carried out
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
