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Record Nr. |
UNISA990003602010203316 |
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Titolo |
Quattro studi in materia di aiuti di stati / a cura di Paolo De Caterini |
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Pubbl/distr/stampa |
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Descrizione fisica |
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Disciplina |
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Soggetti |
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Finanziamenti pubblici - Legislazione comunitaria |
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Collocazione |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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2. |
Record Nr. |
UNISA996418448503316 |
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Autore |
Han Endao |
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Titolo |
Transient Dynamics of Concentrated Particulate Suspensions Under Shear [[electronic resource] /] / by Endao Han |
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Pubbl/distr/stampa |
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Cham : , : Springer International Publishing : , : Imprint : Springer, , 2020 |
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ISBN |
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Edizione |
[1st ed. 2020.] |
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Descrizione fisica |
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1 online resource (XVI, 96 p. 33 illus., 32 illus. in color.) |
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Collana |
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Springer Theses, Recognizing Outstanding Ph.D. Research, , 2190-5053 |
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Disciplina |
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Soggetti |
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Amorphous substances |
Complex fluids |
Fluid mechanics |
Mathematical physics |
Fluids |
Soft and Granular Matter, Complex Fluids and Microfluidics |
Engineering Fluid Dynamics |
Mathematical Applications in the Physical Sciences |
Fluid- and Aerodynamics |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di contenuto |
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Chapter1. Introduction -- Chapter2. Ultrasound techniques for studying suspensions -- Chapter3. Investigating impact-activated fronts with ultrasound -- Chapter4. Modeling shear fronts in one dimension -- Chapter5. Rheology in the shear jamming regime -- Chapter6. Conclusions and outlook. |
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Sommario/riassunto |
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This thesis demonstrates the first use of high-speed ultrasound imaging to non-invasively probe how the interior of a dense suspension responds to impact. Suspensions of small solid particles in a simple liquid can generate a rich set of dynamic phenomena that are of fundamental scientific interest because they do not conform to the typical behavior expected of either solids or liquids. Most remarkable is the highly counter-intuitive ability of concentrated suspensions to strongly thicken and even solidify when sheared or impacted. The understanding of the mechanism driving this solidification is, however, still limited, especially for the important transient stage while the response develops as a function of time. In this thesis, high-speed ultrasound imaging is introduced to track, for the first time, the transition from the flowing to the solidified state and directly observe the shock-like shear fronts that accompany this transition. A model is developed that agrees quantitatively with the experimental measurements. The combination of imaging techniques, experimental design, and modeling in this thesis represents a major breakthrough for the understanding of the dynamic response of dense suspensions, with important implications for a wide range of applications ranging from the handling of slurries to additive manufacturing. |
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