914 resultados para elaborazione di immagini metodi di segmentazione filtri per immagini
Resumo:
Studio e simulazione di un inverter di tipo Z in grado di innalzare il valore della tensione fornita dalla sorgente fino alla tensione richiesta al carico. L'inverter Z-source può essere utilizzato convenientemente nell'azionamento di un veicolo elettrico, in particolare ad idrogeno.
Resumo:
Il seguente elaborato è il risultato di uno stage di sei mesi, svolto presso l’azienda Bosch Rexroth Oil Control S.p.A.. L’ente presso cui è stato svolto il tirocinio è l’Industrial Engineering. In particolare è stata compiuta un’analisi dei flussi delle cartucce meccaniche, una famiglia di valvole oleodinamiche. Il lavoro si è sviluppato in tre fasi: nella prima è stata fatta un’analisi dei dati di giacenza, tempi e cicli di lavoro delle cartucce; nella seconda fase si è proposta l’introduzione di un nuovo sistema di picking gestito con supermarket a kanban; nell’ultima fase si è valutata la convenienza dai punti di vista tecnico ed economico del progetto.
Resumo:
In recent years, the asymmetric organocatalysis has been recognized as an independent area of synthetic chemistry, where the goal is the preparation of any chiral molecule in an efficient, rapid, and stereoselective manner. In this context we have synthesized macromolecular catalysts soluble in the reaction conditions and that can finally recovered by simple precipitation and subsequent filtration. In particular different active compounds (9-epi-NH2 hyidroquinine and β –isocupreidine) have been linked to the terminal group of the main chain polyethylene glycol monomethyl ether (PEG-5000). The macromolecular catalysts have been tested in different reactions and the results have been compared with those of the correspondent low molecular compounds.
Resumo:
One of the key processing parameters in thermoset composites manufacturing is to have an optimum balance between open time and cure time. Long open times followed with a fast cure profile (also referred as snap cure or “hockey stick” shaped profiles) are required on applications like Pultrusion, Filament Winding, Resin Transfer Molding (RTM) and Infusion. In this work, several factors affecting the reactivity of a base line polyurethane formulation were studied. The addition of different components such as internal mold release agents, cross-linker, polyols having different molecular structure and isocyanates having different functionality were studied. A literature search was conducted to identify the main catalyst packages existing in the market. The reactivity of catalyst based on tertiary amines, orgamometallic salts, and co-catalyst of amine-organometallic complexes was characterized. Addition of quelants agents such as thioglycerol and acetyl acetone to delay the catalyst activity were also considered. As a consequence of this work a vast reactivity map was generated. This should guide the formulation designer in future product generations for the further development of the mentioned applications. Recommendations on measurements systems and further areas of exploration are also given.
Resumo:
Approfondimento di tecniche di controllo ottimo per problemi di regolazione e di inseguimento di modello. Sintesi e implementazione di un algoritmo che si occupi del controllo della dinamica laterale di una vettura attraverso il sistema di aerodinamica mobile.
Resumo:
Enzyveba, a partially characterized complex consortium of not-adapted microorganisms developed through prolonged stabilization of organic wastes, was found to markedly intensify the aerobic remediation of aged PAH- and PCB-contaminated soil by acting as a source of exogenous specialized microorganisms and nutrients. Thus, Enzyveba was tested in the bioremediation of Diesel (G1) and HiQ Diesel (G2) contaminated soils under aerobic slurry-phase conditions by means of a chemical, microbiological, ecotoxicological integrated analytical procedure. The addition of Enzyveba resulted in a higher availability of cultivable specialized bacteria and fungi but this resulted in a slight intensification of soil remediation, probably because of the high content of nutrients and specialized microorganisms of the soil. In many cases, the biotreatability of soils impacted by diesel fuel is limited by their poor content of autochthonous pollutant-degrading microorganisms. Thus, bioaugmentation with stable and reproducible cultures with the required broad substrate specificity might be the solution for a successful remediation. Two microbial consortia, ENZ-G1 and ENZ-G2, were enriched from Enzyveba on G1 and G2. Both consortia consist of a similar composition of bacterial and fungal species. They exhibited a comparable and significant biodegradation capability by removing about 90% of 1 g/l of diesel fuel under liquid culture conditions. Given their remarkable biodegradation potential, richness of quite diverse microbes, stability and resistance after cryopreservation at -20 °C for several months, both consortia appear very interesting candidates for bioaugmentation on site. The mycoflora of a soil historically contaminated by high concentration of PCBs was characterised before, at the beginning and at the end of the biotreatment mentioned above. Several mitosporic fungi isolated from soil grew in presence of a mixture of three PCBs congeners when also glucose was provided. This is the first study in which 5 strains of mitosporic species able to biodegrade PCB are reported in the literature.