Thèses sur le sujet « Analisi dei flussi di massa »
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Michelini, Tamara. « Analisi sperimentale delle scabrezze di superficie e di fondo per la modellazione dinamica dei flussi torrentizi e della caduta massi ». Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424440.
Texte intégralQuesta ricerca è finalizzata allo studio dei meccanismi di resistenza al moto nei corsi d’acqua montani e sui versanti per comprendere meglio le dinamiche di esplicazione dei diversi processi naturali. In particolare il ruolo svolto dalla topografia locale e gli effetti della presenza della vegetazione arborea. Gli intenti scientifici sono quindi quelli di analizzare in modo approfondito le interazioni tra i singoli processi naturali, la superficie di scorrimento e il soprassuolo arboreo nella definizione delle resistenza al moto. L’indagine è stata condotta attraverso osservazioni e rilievi di campo relativi a due eventi reali di debris flow ed un evento di rockfall; inoltre, sono stati condotti test in scala ridotta di debris flow e in scala reale di caduta massi e correnti idrauliche. Gli obiettivi del progetto sono stati strutturati su tre tematiche principali: 1.fornire una revisione critica delle procedure utilizzate in letteratura per la stima della resistenza al moto nei confronti dei singoli processi consideranti; 2. esaminare le possibili interrelazioni tra il processo e gli elementi di scabrezza, in particolare la morfologia e la topografia del terreno e la vegetazione arborea ed arbustiva; 3. definire una nuova metodologia per la quantificazione della scabrezza superficiale spazialmente distribuita, in grado di rappresentare gli effetti dell’irregolarità del terreno e implementarla all'interno di un programma di modellazione numerica. Scopo finale della ricerca è quello di approfondire le conoscenze riguardanti la cinematica dei processi naturali analizzati e giungere alla definizione di indicazioni per la gestione dei boschi di protezione. Le aree di studio scelte sono state le seguenti: a) una porzione di versante del Monte Antelao (Vodo di Cadore, Belluno) recentemente oggetto di un crollo di roccia che ha interessato il popolamento forestale posto a valle; b) un canale da valanga presente nel massiccio di Belledonne, nella foresta comunale di Vaujany (Francia) in cui sono state condotte prove a scala reale di caduta massi; c) il deposito detritico di due eventi di debris flow e la componente forestale coinvolta lungo i rii Somprade (Auronzo di Cadore, Belluno) ed Senago (Val di Vizze, Bolzano); d) due tratti di una scala di rimonta per pesci collocata a lato del Torrente Vanoi (Canal San Bovo, Trento), costruite con una morfologia a step-pool, assimilabili ad un modello fisico a scala reale. Inoltre, a supporto del lavoro di campo, lo studio dei debris flow e le relazioni con la componente forestale sono state approfondite conducendo test di laboratorio in scala ridotta su reometro a piano inclinato presso la Facoltà di Agraria dell’Università di Milano. Lo studio delle mutue relazioni del crollo di roccia e delle colate detritiche con la foresta è stato condotto a diversa scala: attraverso indagini di campo post-evento, prove di laboratorio a scala ridotta (limitatamente per il processo di colata detritica) ed infine eseguendo alcune modellazioni numeriche. La campagna di rilievi ha permesso di approfondire le conoscenze sui danni prodotti dall’impatto dei massi e dei flussi detritici sugli alberi e come questi reagiscono, nonché il modo in cui possono fornire, con la loro presenza, un’effettiva azione di contenimento delle runout. I test di laboratorio hanno consentito di esaminare l’effetto complessivo del popolamento forestale in conoide sui depositi dei debris flow e come questo cambia in funzione del tipo di governo (a fustaia o a ceduo). Le modellazioni numeriche hanno invece permesso di esplorare più in dettaglio le modalità e le limitazioni dell’implementazione della componente arborea ed arbustiva all'interno del modelli stessi e come cambia il potere di protezione offerto da un soprassuolo forestale nei confronti del crollo di roccia durante il suo ciclo di sviluppo, cioè nel medio/lungo periodo. I software impiegati sono stati RockyFOR-3D per la caduta massi e il crollo di roccia e FLO-2D per le colate detritiche. Le evidenze di campo e le simulazioni in laboratorio hanno messo in luce come l’effetto della vegetazione arborea ed arbustiva influenzi i processi deposizionali del crollo di roccia e dei debris flow. In particolare, l’importanza di accoppiare modelli di crescita del popolamento forestale a modelli di simulazione numerica del processo del crollo di roccia e della caduta massi e il confronto tra lo scenario non boscato con gli scenari boscati. Per le colate detritiche è emerso che il diverso regime di deflusso influenza il modo in cui gli alberi concorrono alla soppressione del movimento, ovvero quando domina il regime collisionale, alberi di grandi dimensioni e bassa densità producono spessori di deposito più elevati, direttamente proporzionali al diametro stesso, mentre, quando domina il regime frizionale, il deposito del materiale è favorito dall'aumento della superficie di scorrimento, perciò una foresta densa composta da alberi di piccole dimensioni o arbusti forniscono una migliore capacità di ritenzione. Inoltre, una gestione a ceduo sembra capace di contribuire sempre alla deposizione delle colate detritiche su distanze che diminuiscono all’aumentare della concentrazione solida. Per quanto riguarda lo studio cinematico delle correnti idrauliche condotto eseguendo prove di diversa portata sui tratti a step-pool hanno confermato precedenti studi che affermano che la deviazione standard fornisce una misura più affidabile di scabrezza nelle diverse morfologie di canale, al contrario della granulometria; che la maggior parte della perdita di energia, soprattutto per le portate basse, è dovuta alla "spill resistance"; e che, in queste morfologie, la sommergenza relativa diminuendo e la pendenza aumentando cooperano nel favorire la dissipazione di energia. Il tentativo di proporre un nuovo metodo automatizzato per la definizione del parametro di scabrezza da impiegare nel modello numerico di simulazione tridimensionale della caduta massi ha prodotto una generale sovrastima delle variabili analizzate. Ciononostante, la buona approssimazione dei valori massimi ne indicano un potenziale di sviluppo.
Palmisano, Francesco. « Algorithmic-guardians : analisi dei flussi di dati provenienti da sistemi Android ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19599/.
Texte intégralVavuliotis, Anastasio. « Analisi dei flussi logistici di uno stabilimento industriale : il caso "MEC3" ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3035/.
Texte intégralGuidetti, Mattia. « Ricostruzione di flussi veicolari su scala regionale : analisi dei dati disponibili ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5957/.
Texte intégralLeonardi, Nicholas. « Analisi e riprogettazione dei flussi produttivi e del layout di un’azienda di assemblaggio ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Trouver le texte intégralFERRONATO, GIULIA. « Valutazione dell'impatto ambientale a diversi livelli di scala del settore zootecnico ». Doctoral thesis, Università Cattolica del Sacro Cuore, 2020. http://hdl.handle.net/10280/72497.
Texte intégralIn the last three decades global demand of food, in particular animal proteins (meat, milk, and eggs), has increased according to the population growth, that is expected to go up to 9 billion by the 2050. These, in fact, represent an important source of energy, high-quality protein, micronutrients and vitamins. Therefore, this improvement could contribute to the lifespan increase and food demand. The latter forced the agricultural sector to a further intensification that affected also the cultivation of crops for animal feeding. Agricultural and livestock productions have a relevant environmental impact, and this topic is object of criticism and scientific investigation also to more accurately define its contribution and potential mitigation strategies, considering also that agricultural stage is the main contributor to the environmental impact of the food production chain. It is recognized, in fact, that agricultural sector directly contribute to the 21% of total global anthropogenic greenhouse gas emissions, mostly consisting of methane followed by nitrous oxide and carbon dioxide. These emissions are mainly associated with the livestock production, in particular with ruminants breeding that contributes directly to methane emissions due to ruminal and manure fermentation; the remaining part is composed by indirect emissions from deforestation, energy use and animal feed production. The scope of this thesis was the evaluation of environmental footprint in the livestock sector at different subject scale level. Italian meat supply chain, dairy farms, Grana Padano PDO cheese factory and single animals was investigated in order to quantify environmental footprint. In the first work, the Italian meat supply chain has been evaluated whit a mass flow analysis (MFA) approach and life cycle assessment (LCA) approach. Firstly, the quantification of meat had been made from slaughter to household consumption, starting form carcass weight to real meat consumed. At these levels, meat form cattle, pig, sheep and goat, equidae, and rabbit was taken in account. During the chain also meat losses and waste were quantified. In particular animal by-products (ABPs) were quantified for single species and categorized into heath level risk according to the Regulation (EC) 1069/2009. According to the category (Cat 1, Cat 2 or Cat3), assuming that all ABPs were destinated to rendering process, use and disposal of rendered products was identified. The MFA confirmed how Italy is a net importer of cattle and pork meat while it is self-sustaining for poultry meat. Mass flow analysis revealed that in 2013, 2.86 Mt of meat were consumed in Italy. It is equivalent to 131 g/day/pro-capita and to 47.91 kg/year/pro-capita of meat consumed. In percentage the total amount of consumed meat is represented by 46% of pig, 28% of poultry and 23% of cattle and 3% of other meat (rabbit, equidae, and sheep and goat). This approach quantified the ABPs produced at slaughtering level and food wastes at retail and consumer levels. Slaughter phase was the main source of waste, producing 0.80 Mt of ABPs, 48% of the total amount of waste originated in the meat supply chain. Results highlighted how the ABPs are already almost completely reused, compatibly with their health level risk, demonstrating the circularity of the system through the quantification of the avoided products and relative GHGs emissions. Concerning other food wastes, the results of the present evaluation could be considered only an estimate due to the lack of specific national coefficients. After quantification LCA was applied in order to evaluate environmental footprint, considering also avoided product due to the re-use of rendered ABPs. LCA results reveal that daily meat consumption pro-capita emits 4.0 kg CO2eq represented by 30% of cattle meat, 9.6% of pig meat and 8% of poultry meat. Emissions allocated to ABPs are the 60% and their re-use decrease the emissions about 10%. Second and third works focused the milk and PDO Grana Padano global warming potential (GWP). Overall, twenty-seven dairy farms, producing milk destinated to Grana Padano PDO cheese and one cheese factory, situated in the Piacenza province were evaluated. Primary data were collected by using a specific survey. This included for the farms the request of data regarding herd composition, feeding management, milk production, herd management and performace, crops cultivation and resource use, whereas for the cheese factory, the survey included energy resource use and input requested by cheese making process. In the second work, 10 dairy farms were evaluated in order to assess the milk Carbon Footprint (CF) and the main source of emissions. The system boundary was a cradle-to-farm-gate and functional unit is 1 kg of FPCM (Fat and Protein corrected milk). The CF of 1 kg of FPCM resulted equal to 1.33 kg CO2eq/kg FPCM with a wide range of variation from 1.02 to 1.62 kg CO2eq/kg FPCM. Emissions due to enteric fermentation and manure fermentation represented the 52% of the total, while acquired feed the 36%. Self-production and energetic consumption represented 6% and 6% respectively. In the third, Grana Padano PDO production was considered. The milk destinated to cheese processing showed an average value of CF equal to 1.38 kg CO2eq/kg FPCM, with a minimum value of 1.02 and a maximum one of 1.94 kg CO2eq/kg FPCM. Instead, the CF average value of 1 kg of PDO Grana Padano cheese was equal to 9.99 kg CO2eq, showing an agricultural stage contribution of 94%. Results of these works were in accord with similar studies reported in literature and had pointed out how dairy farms showed a greater level of environmental sustainability but with possibilities for improvement, mainly through herd management enhancement (productive and reproductive performances). Fourth work was about the development of proxies able to predict the methane emissions from individual cows. This focus is a hot research point in order to improve the mitigation strategies to reduce methane emissions because of the main GHG contributor. Methane emission is mainly driven by feed intake and diet composition, but it is difficult to measure intake in commercial farms. The study aimed to verify the possibility of using NIRS of faeces (NIRSf) alone and in combination with other phenotypic parameters available at a farm level to predict methane production (MP, g/d) from individual lactating dairy cows. NIRSf alone allowed a fairly good estimation of methane yield and the estimations were improved to a similar degree when BW, MY or ECM were considered, whereas combining NIRSf with more than one other parameters improved the estimations with a very little extent only. Methane can be predicted using models that consider the DMI, BW or MY but the main limitation is represented by the data availability. Near Infrared technique applied to faecal samples, in particular when combined with other phenotypic parameters, can represent a valid alternative for large-scale measurements in commercial dairy farms for genetic selection of low emitters dairy cows, when DMI measurement is usually not available.
Leo, Guido. « Analisi dei flussi in un reparto di assemblaggio e collaudo di valvole direzionali oleodinamiche ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Trouver le texte intégralRizzi, Matteo. « Analisi dei flussi logistici ed ottimizzazione del processo di previsione : il caso Unigrà ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Trouver le texte intégralSucci, Michela. « Analisi dei flussi logistici e re-layout di uno stabilimento industriale : caso Tecnomec s.r.l ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8482/.
Texte intégralLeardini, Giulia. « Variabilità stagionale dei flussi verticali di metalli nel particolato dell'Adriatico Meridionale ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Trouver le texte intégralMiti, Lorenzo. « Modello di razionalizzazione economica e analisi di impatto ambientale dei flussi di materiali interaziendali : il caso Marchesini Group S.p.A ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22508/.
Texte intégralCogo, Giulia <1993>. « Mappatura, analisi e riprogettazione dei flussi di magazzino : il supermarket G3 nel caso AGCO SpA ». Master's Degree Thesis, Università Ca' Foscari Venezia, 2018. http://hdl.handle.net/10579/13399.
Texte intégralGerini, Francesco. « Analisi dei profili di tensione e dei flussi di potenza in diversi tipi di reti di distribuzione in media e bassa tensione mediante il software OpenDSS ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Trouver le texte intégralPersici, Giacomo. « Analisi ed Ottimizzazione dei flussi logistici di un magazzino industriale. Il caso Gea Mechanical Equipment S.p.A ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14851/.
Texte intégralPicciotti, Giuseppe. « Gestione dei flussi informativi e analisi di progettazione in un'azienda operante nel campo delle protezioni antinfortunistiche ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Trouver le texte intégralFratta, Giusy. « Analisi e razionalizzazione dei flussi di materiale in ingresso e dei trasporti in un'ottica di logistica integrata : il caso Denso Manufacturing Italia S.p.A ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1318/.
Texte intégralStefanelli, Francesco. « Analisi dei flussi e di relayout nella valutazione di ampliamento del mix produttivo : il caso Baioni Crushing Plants S.p.A ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amslaurea.unibo.it/477/.
Texte intégralCicognani, Giacomo. « Analisi e ottimizzazione dei flussi logistici dei componenti per le linee di assemblaggio di forni e piani cottura nello stabilimento di Forlì : Il caso Electrolux S.p.A ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20086/.
Texte intégralMionetto, Lisa <1992>. « Gabriele d'Annunzio Analisi dei carteggi e degli scritti di un poeta pubblicitario e comunicatore di massa ». Master's Degree Thesis, Università Ca' Foscari Venezia, 2016. http://hdl.handle.net/10579/9326.
Texte intégralBarletta, Giulia. « Analisi delle anomalie nei flussi di inbound ed outbound dei materiali in una catena di fornitura esterna : il caso TMHMI ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24097/.
Texte intégralSgatti, Federico. « Pianificazione strategica e operativa : dalla mappatura di processo all'efficientamento dei flussi di approvvigionamento in un sistema manufatturiero complesso - Il caso Eurovo ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23795/.
Texte intégralMichinelli, Matteo. « Analisi dei flussi per la riprogettazione del layout e delle risorse produttive : il caso S.E.F.A Acciai Srl ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16550/.
Texte intégralCortezzi, Virginia. « Analisi dei dati idrologici e pluviometrici relativi all'invaso di Ridracoli (FC) per la stima delle variazioni climatiche e del regime dei flussi ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8994/.
Texte intégralTaroni, Elisa. « Razionalizzazione del sistema di material handling per l'alimentazione delle linee di montaggio. Il caso IEMCA - Bucci Automations S.p.A ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Trouver le texte intégralTiti, Fabrizio. « Analisi dei trasferimenti di massa durante la reidratazione di baccalà (Gadus morhua) pre-trattato con campi elettrici pulsati ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20883/.
Texte intégralCamillini, Alice. « Analisi dei flussi produttivi ed applicazione di tecniche per la programmazione della produzione in una azienda del settore fashion ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/841/.
Texte intégralLorenzi, Silvia <1988>. « Nuovo Turismo Cinese. Analisi dei flussi outgoing verso l'Europa, l'Italia e presentazione di nuove opportunità per la regione Umbria ». Master's Degree Thesis, Università Ca' Foscari Venezia, 2013. http://hdl.handle.net/10579/3582.
Texte intégralLUCIANO, ANTONELLA. « Studio del comportamento dei DNAPLs nel suolo e nel sottosuolo : analisi sperimentale e simulazione numerica ». Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2009. http://hdl.handle.net/2108/1052.
Texte intégralSoil and groundwater contamination due to release and transport of organic compounds characterized by a density higher than water and a low water solubility (currently referred to as DNAPL, Dense Non Aqueous Phase Liquid), represents a diffuse environmental problem, due to their large use in industrial or commercial processes. Characterization and remediation of sites contaminated by these compounds is critical and difficult as a consequence of their peculiar physical-chemical properties. In fact, due to their limited but environmentally significant aqueous solubility, spills of these compounds typically result in the formation and migration of an organic separate phase that is denser than water and can move for significant distances in the subsurface, contaminating large volumes of the subsurface environment. When introduced into the subsurface, gravity causes the DNAPL to migrate downward through the unsaturated and saturated zone as a distinct liquid. This vertical migration is also accompanied to some extent by lateral spreading due to the effect of capillary forces and to medium spatial variability. When an amount of DNAPL reaches the water table, if it has sufficient energy, being denser than water, the free phase keeps on moving mainly downward for gravity while a dissolved phase begins to move down-gradient generating a contaminant plume where the different DNAPL constituents will be dissolved at different concentration depending on their specific water solubility. The resulting DNAPL distribution is characterized by zones of entrapment at low saturation (residual, ganglia and blobs) and high saturation (pools at permeability barriers and macro-scale entrapment zones resulting from capillary barriers). Entrapped DNAPL dissolves slowly into flowing groundwater and acts as a long-term source of contamination. The contamination scenario described above makes any remediation attempt very difficult. In site characterization, in order to select the most feasible remediation technique and to estimate the required remediation time, identification of the source position and amount is then required. A comprehensive investigation of such aspects is still lacking; some attempts have been proposed to apply the laws of multiphase and multi-component transport in order to develop specific simulators. In any case, their predictive capability and the suitability of the various assumption embodied in them, need to be evaluated versus controlled laboratory experiments. Several experimental studies have been reported in literature but there are only a few reports of NAPL source migration in comparison with those of solute transport. Tests for DNAPL remediation by using a surfactant, co-solvents or PRB have been performed. Furthermore among the NAPL-related reports, more experimental investigations have been carried out on LNAPL migration, rather than on DNAPL migration. Migration and dissolution processes have been studied at lab scale in one dimensional column. Just some two-dimensional tank tests for measuring NAPL migration in heterogeneous ground system and for studying the effect of groundwater flow on NAPL behaviour have been performed. The aim of this study is then to enhance the knowledge on DNAPL transport in porous media by means of : 1. Theoretical aspects about DNAPL migration; 2. Experimental procedure to study DNAPL migration in porous media; 3. Experimental tests in 2-D apparatus; 4. Numerical simulations. The basis for an experimental procedure have been defined and materials and methods to investigate DNAPLs behaviour in the subsurface, during experimental procedures, have been optimized. An image analysis procedure has been developed and applied to reproduce dynamic DNAPL saturation profiles during the infiltration process. In particular, the saturation measure allows to highlight the morphology of the preferential flow paths influencing DNAPLs fate. For a quantitative analysis of the characteristics of the overall flow, measures should be fast, accurate and if possible non-intrusive. All these features are specific to those techniques that use optical properties of the media as well as the image analysis methods. The image analysis represents a non-invasive and cost-effective procedure to reproduce the saturation profile under dynamic condition. Generally, the non-intrusive or non-destructive methods used to measure fluid saturation, such as gamma ray, or conventional X-ray attenuation techniques, do not allow the acquisition of dynamic fluid saturation distribution in the entire flow domain at one time. Because of practical limitations on source intensity, long counting times are needed and only one point can be measured at one time. This contrasts with the need to obtain data useful not only for the study of DNAPL behaviour in soil, but also to validate models. For these reasons the image analysis methods are valuable alternative tools in measuring transient phenomena in the entire flow domain at one time. Various parameter, linked to reflected light intensity which can be correlated to fluid saturation are reported in literature. The image procedure presented in this paper is based on reflected light intensity. The method was applied to two-phase flow in 2D experiments and allows continuous, quantitative and dynamic full field mapping of DNAPL saturation during infiltration and redistribution processes. The suitability of this method has been validated by means of a mass balance calculation of the infiltrated DNAPL amount. Materials and compounds usable in laboratory activities have been chosen and a 2-D apparatus able to simulate different hydraulic condition has been realized. The experimental activity was divided into two distinct phases. In the first phase the process of DNAPL migration has been analyzed, in the second mass transfer according to the morphology of the sources zones. In the first stage the experiments were performed using different hydraulic conditions, in order to assess the effects of stratification and the groundwater flow on the characteristics of the migration process (DNAPL infiltration and redistribution) and the behavior of sources zones. By means of performed experiments important information were obtained. The migration and redistribution processes, the infiltration and migration velocity, the characteristics of migration body, the saturation profiles and the amount of contaminated soil have been calculated for different hydraulic gradients. In the second phase two experiments with different values of water flow velocity was conducted in order to study the dissolution process under controlled conditions in a homogeneous porous medium. The influence of groundwater flow and the architecture of the sources (form and dimensions) on the processes of mass transfer have been evaluated. These experiments represent a first step towards understanding the processes of dissolution of DNAPLs, and represent therefore a starting point for future developments of the research. The obtained information provide useful data, not only for a better understanding of the behavior of DNAPLs in the soil, but also to validate the equations currently used in the study of multiphase flow, in addition, to calibrate the models commonly used. Numerical simulation with MOFAT have been carried out to obtain useful information about operative conditions, as well as the best configuration of the experimental tests, the best sampling points location, the contaminants amount and the conditions of the release, and finally the characteristics of the medium and the hydraulic conditions. Subsequently, on the basis of experimental results obtained, further numerical simulations have been developed, using the model TMVOC, in order to properly calibrate the parameters of interest and to reproduce the observed migration process. This activity was conducted in collaboration with the Christian Albrechts University in Kiel, in the European research project Model Probe. The first experimental results shown the influence of hydraulic gradient on separate phase migration. The hydraulic gradient, even if in this case accompanied to a high permeable medium, promotes the infiltration process, increasing the infiltration rate, it hampers a deviation with respect to the expected vertical direction of the motion. This shift is not revealed by the hand of some common models of multiphase transport. The displacement occurred to the barycentre of the DNAPL mass may lead to significant error in the location of sources, in the case of high gradients and high aquifer thicknesses and in the evaluation of the effects of water supply or pump and treat activities or other remediation strategy based on an increasing of water circulation. The results obtained showed the formation of residual DNAPL zones and influence of water flow on sources and contaminated soil amounts. The hydraulic gradient promotes, not only the redistribution process, but it also reduces pooled and residual DNAPL. This circumstance brings to a reduction of contaminated soil volume in presence of water motion. This effect is due to the easier penetration of water in the pores previously occupied by the DNAPL during its migration, but also it is due to the reduction of DNAPL spread with the hydraulic gradient increasing. The water motion, therefore, promotes both the drainage process, during which the DNAPL migrating occupies the pores saturated by water, and the imbibition process, during which the water returns to invade the pores previously occupied by DNAPL. These results confirm the importance of hydrodynamic conditions in determining the routes of migration and source morphology and the extension. The results of the second phase of the research shown the influence of water filtration on the mass transfer and the degree of sources reduction. These issues are critical to determine the effectiveness and efficiency of remediation activities based on the treatment of localized sources or plume containment. The mass transfer and the rate of sources reduction in presence of high-water flow velocities, are controlled by the presence of water flow. In terms of filtering close to those occurring in natural aquifers, however, is the sources architecture that most influence the mass transport and the sources reduction. The experimental work conducted to evaluate the behavior of the separated phase, together with those opened for the study of the dissolved phase, is therefore a fundamental step for a subsequent study on methodologies for the treatment of persistent sources of contamination such as DNAPL.
Pellegrino, Antonio. « Studio e realizzazione di uno strumento standard per la compilazione di documenti di validazione - Il caso Marchesini Group ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Trouver le texte intégralMonsignori, Linda. « Studio del layout di un impianto industriale : l’analisi dati e la procedura Systematic Layout Planning. Il caso Officine Gullo Srl ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14331/.
Texte intégralBruni, Federica <1995>. « Le strategie di promozione turistica della destinazione : analisi della piattaforma digitale di destinazione Toscana “Visittuscany” come contributo alla valorizzazione della destinazione, favorendo una migliore distribuzione dei flussi su tutto il territorio ». Master's Degree Thesis, Università Ca' Foscari Venezia, 2021. http://hdl.handle.net/10579/18790.
Texte intégralSpitilli, Mattia. « Analisi del sito EVI-II nel bacino del fiume Holtum (Danimarca) : monitoraggio e modellazione numerica per l'interpretazione dei processi di scambio fra correnti superficiali e flussi sotterranei ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Trouver le texte intégralValsecchi, Lara Gea. « Valutazione della presenza di interferenti endocrini in acque ad uso potabile ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Trouver le texte intégralCastellani, Giovanni. « Data capturing : studio di fattibilità per l’acquisizione automatizzata delle informazioni lungo la catena produttiva ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Trouver le texte intégralBROCCARDO, ELEONORA. « Le strutture innovative per la cartolarizzazione del prestiti : valore economico del tranching e modelli di misurazione del rischio di credito ». Doctoral thesis, Università Cattolica del Sacro Cuore, 2007. http://hdl.handle.net/10280/130.
Texte intégralSecuritisation is a structured finance instrument which involves pooling of financial assets (such as loans and bonds) and creating multiple tranched liabilities, collateralized debt obligation (CDO), of a single issuer with different risk-return characteristics, which are sold as separate securities. According to the New Basel Capital Accord, tranching is the key feature that distinguishes securitisation transactions; although commonly applied, the factors that determine the extent and the nature of tranching remain largely unknown. Moreover, because tranching allows the risk characteristics of the collateral pool to be transformed, it contributes to transaction complexity in assessing the risk properties of such structured instruments: the risk profile that can be generated through tranched exposure, in terms both of expected/unexpected incidence losses and correlated default of pool assets, can lead to substantial differences among tranches, depending on the level of subordination below a certain tranche. Key to the reliability of structured finance pricing and ratings is the accuracy in assessing the credit risk in the underlying portfolio (credit risk modelling), as well as the accurate modelling of the distribution of cash flows to different classes of CDO (cash flow modelling). By analyzing the finance literature relating to security design and securitization this thesis provides an analysis of the efficiency of financial intermediation model based on securitisation and an empirical test of theories supporting the economic added value of tranching, with regard to SMEs loan securitisation, which topic was specifically investigated during a stage at the European Investment Fund. By realization of a computational model, performed using a multidimensional modelling software (Quantrix), the thesis closely examines securitisation transaction's technicalities, by modelling both portfolio cash flows and funds allocation (Waterfall Payment Order), in order to asses the ability of the structure to withstand various stressed scenarios. This analysis offers an analytical and micro-approach to securitisation transactions, which has not deeply investigated in academic literature yet. The model applies to SMEs loan securitisation transactions, concluded within specific securitisation European Programme (Ftpyme in Spain and Promise in Germany).
BROCCARDO, ELEONORA. « Le strutture innovative per la cartolarizzazione del prestiti : valore economico del tranching e modelli di misurazione del rischio di credito ». Doctoral thesis, Università Cattolica del Sacro Cuore, 2007. http://hdl.handle.net/10280/130.
Texte intégralSecuritisation is a structured finance instrument which involves pooling of financial assets (such as loans and bonds) and creating multiple tranched liabilities, collateralized debt obligation (CDO), of a single issuer with different risk-return characteristics, which are sold as separate securities. According to the New Basel Capital Accord, tranching is the key feature that distinguishes securitisation transactions; although commonly applied, the factors that determine the extent and the nature of tranching remain largely unknown. Moreover, because tranching allows the risk characteristics of the collateral pool to be transformed, it contributes to transaction complexity in assessing the risk properties of such structured instruments: the risk profile that can be generated through tranched exposure, in terms both of expected/unexpected incidence losses and correlated default of pool assets, can lead to substantial differences among tranches, depending on the level of subordination below a certain tranche. Key to the reliability of structured finance pricing and ratings is the accuracy in assessing the credit risk in the underlying portfolio (credit risk modelling), as well as the accurate modelling of the distribution of cash flows to different classes of CDO (cash flow modelling). By analyzing the finance literature relating to security design and securitization this thesis provides an analysis of the efficiency of financial intermediation model based on securitisation and an empirical test of theories supporting the economic added value of tranching, with regard to SMEs loan securitisation, which topic was specifically investigated during a stage at the European Investment Fund. By realization of a computational model, performed using a multidimensional modelling software (Quantrix), the thesis closely examines securitisation transaction's technicalities, by modelling both portfolio cash flows and funds allocation (Waterfall Payment Order), in order to asses the ability of the structure to withstand various stressed scenarios. This analysis offers an analytical and micro-approach to securitisation transactions, which has not deeply investigated in academic literature yet. The model applies to SMEs loan securitisation transactions, concluded within specific securitisation European Programme (Ftpyme in Spain and Promise in Germany).
Calcagno, Giovanni, Paolo Veltri et Giuseppe Mendicino. « Analisi dei flussi energetici per la stima dell’evapotraspirazione attraverso tecniche di telerilevamento satellitare ». Thesis, 2007. http://hdl.handle.net/10955/622.
Texte intégralSETOLA, NICOLETTA. « Strumenti di gestione e progettazione ospedaliera : analisi delle configurazioni spaziali in rapporto al sistema dei flussi. Applicazione al caso studio del Polo Ospedaliero di Careggi ». Doctoral thesis, 2009. http://hdl.handle.net/2158/508662.
Texte intégralBULGINI, Giulia. « Il progetto pedagogico della Rai : la televisione di Stato nei primi vent’anni. Il caso de ‹‹L’Approdo›› ». Doctoral thesis, 2018. http://hdl.handle.net/11393/251123.
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