Search results for " Ingegneri"
showing 10 items of 809 documents
Analisi di processo e dinamica della comunità batterica nel trattamento di sedimenti marini con reattori bioslurry
2020
Nella nota sono riportati i risultati di una sperimentazione condotta mediante la messa in esercizio di un reattore bioslurry per il trattamento di sedimenti marini contaminati da idrocarburi. Sono state valutate le performance di processo in termini di rimozione di TPH (86% con velocità di rimozione massima di 36 mgTPH kg-1 d-1) congiuntamente ad altre tipologie di indagini volte ad ottenere maggiori informazioni sulla natura dei processi che si sono sviluppati nel reattore. Nello specifico, è stato utilizzato un approccio di tipo microbiologico mediante l’adozione di una tecnica di sequenziamento di nuova generazione (NGS - Next Generation Sequencing). Dall’analisi dei dati biologici è st…
Ponti di Sicilia (XVI-XIX secolo). Catalogo della mostra
2015
Ad essere esposti sono stati disegni, incisioni, libri, modelli e documenti archivistici, molti dei quali presentati al pubblico per la prima volta, provenienti da archivi, biblioteche, nonché collezioni pubbliche e private, con l'intento di provare a "ricostruire", attraverso le carte le immagini, la storia complessa e stratificata dei ponti siciliani, interpretandone le vicende progettuali e costruttive anche in relazione al più ampio dibattito che ha animato il mondo scientifico europeo, in particolar modo tra XVII e XIX secolo.
Combination of ozonation and photocatalysis for purification of aqueous effluents containing formic acid as probe pollutant and bromide ion
2014
The treatment by advanced oxidation processes (AOPs) of waters contaminated by organic pollutants and containing also innocuous bromide ions may generate bromate ions as a co-product. In the present work heterogeneous photocatalysis and ozonation have individually been applied and in combination (integrated process) to degrade the organic compounds in water containing also bromide anions. The results show that: i) the sole photocatalysis does not produce bromate ions and in the case of its presence, it is able to reduce bromate to innocuous bromide ions; ii) the integration of photocatalysis and ozonation synergistically enhances the oxidation capabilities; and iii) in the integrated proces…
The influence of reverse flow on the dynamics of closed-loop supply chains
2014
The purpose of this paper is to study the impact of reverse logistics’ factors on the order and inventory variance amplification in a closed-loop supply chain. We adopt a difference equation math approach for analysing a closed-loop supply chain. Results show how the return flow positively affects both the inventory variance and the bullwhip effect independently of the number of echelons. On the contrary, an increasing remanufacturing lead-time negatively affects both the two metrics studied independently of the above mentioned settings. However, when the number of echelons increases, the benefit provided by the return flow tends to decrease.
Uncertainty in environmental and hydrological mathematical modelling
2012
The current state of knowledge regarding uncertainties in urban drainage models is poor. This is in part due to the lack of clarity in the way model uncertainty analyses are conducted and how the results are presented and used. There is a need for a common terminology and a conceptual framework for describing and estimating uncertainties in urban drainage models. Practical tools for the assessment of model uncertainties for a range of urban drainage models are also required to be developed. This paper, produced by the International Working Group on Data and Models, which works under the IWA/IAHR Joint Committee on Urban Drainage, is a contribution to the development of a harmonised framewor…
The importance of relation-specific investments in capital structure decision: the case of the biopharmaceutical industry
2012
According to capital structure literature, bilateral relationships with external partners have a strong impact on a firm’s financing decisions because they involve relation-specific investments that would lose most of their value in case of liquidation. By adjusting their capital structure firms can reduce liquidation risks and incentive their partners to undertake such investments. In this paper we extend these arguments to strategic alliances in the context of biotechnology industry, where bilateral relationships are formed to advance the commercialization of innovation and R-S investments are a primary issue. We investigate alliances heterogeneity and analyze whether partnerships possess…
Capital structure decisions in the biotechnology industry: the role of R&D collaborations with pharmaceutical incumbents
2011
This study focuses on the importance of collaborative R&D attitudes of biotech firms in the capital structure determination. Specifically, we investigate the short term impact of R&D agreements on financial leverage and we analyze whether this relationship depends on alliances’ features and the type and characteristics of the partners involved. Our results suggest that agreements with established pharmaceutical incumbents are followed by a reduction in the level of debt, while collaborations with biotech firms do not play a significant role, at least in the short term. However, different explanations are plausible. Our findings could be consistent with an “extension” of the pecking order th…
Nel «garbuglio dei tubi». Le lettere dell’ingegner Gadda
2017
Il saggio propone un'analisi del carteggio di Carlo Emilio Gadda con l’«Ammonia Casale», che costituisce un osservatorio d’eccezione da cui mettere a fuoco le contraddizioni dello scrittore-ingegnere. L’epistolario comprende 54 messaggi di Gadda e 26 dell’«Ammonia Casale S.A.» e copre l’arco di tempo decisivo che va dall’aprile 1927 al gennaio del 1940 (con una lunga interruzione tra l’autunno del 1931 e la primavera del 1936): sono gli anni cruciali dell’apprendistato letterario, in cui il romanziere fa le sue prime prove pubbliche. Nella corrispondenza si deposita quindi un collaudato repertorio di situazioni e di temi, che riappariranno, variati, nell’opera: il tema del viaggio, inteso c…
PLLA scaffolds produced by thermally induced phase separation (TIPS) allow human chondrocyte growth and extracellular matrix formation dependent on p…
2016
Damage of hyaline cartilage species such as nasoseptal or joint cartilage requires proper reconstruction, which remains challenging due to the low intrinsic repair capacity of this tissue. Implantation of autologous chondrocytes in combination with a biomimetic biomaterial represents a promising strategy to support cartilage repair. The aim of this work was to assess the viability, attachment, morphology, extracellular matrix (ECM) production of human articular and nasoseptal chondrocytes cultured in vitro in porous poly(L-lactic) (PLLA) scaffolds of two selected pore sizes (100 and 200 μm). The PLLA scaffolds with 100 and 200 μm pore sizes were prepared via ternary thermally induced ph…
Long Term Efficiency Analysis of Infiltration Trenches Subjected to Clogging
2018
Abstract: In recent years, limitations linked to traditional urban drainage schemes have been pointed out and new approaches were developed introducing more natural methods for retaining and/or disposing of stormwater. Such practices include infiltration and storage tanks in order to reduce the peak flow and retain part of the polluting components. The impact of such practices on stormwater quantity and quality is not easily assessable because of the complexity of physical and chemical processes involved. In such cases, integrated urban drainage models may play a relevant role providing tools for long term analysis. In this study, the effect of the clogging phenomenon has been assessed by m…