Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 148 for “"structure formation"”.
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Early stages in cosmic structure formation
… the origin and evolution of large scale structure in the universe. We approach these questions from two different angles in two related but independent projects. The outcomes of these two investigations jointly contribute to our understanding of the large scale structure of the universe …
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Structure Formation Mechanism of Isoporous Block copolymer Membranes
… highly symmetric pore network (PN). A general structure growth during film formation was observed and further confirmed by in situ synchrotron SAXS measurements. From these investigations basic conclusions for optimized membrane preparation in terms of solvent and polymer composition and …
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Turbulence and structure formation in the interstellar medium
The interstellar medium (ISM) structure and dynamics are the result of the interplay between many physical processes such as turbulence, gravity, thermal processes, magnetic fields and cosmic rays which determine the modes of molecular cloud and star formation, and which in turn, define the global …
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Structure formation and fractionation in systems of colloidal rods
… order. In the present work, we investigate structure formation and fractionation in systems of rodlike colloids with the help of Monte Carlo simulations in the NPT ensemble. Repulsive interactions can successfully be mimicked by the hard rod model, which has been studied extensively in the …
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Dynamics of Membrane Structure Formation in Quenched Polymer Solutions
… initial solution composition on the predicted structure-formation dynamics are elucidated. For the PMMA/NMP/glycerol system, model predictions agree well with real-time data obtained from light scattering measurements. Predicted pore growth rate curves exhibit a relative maximum with both …
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Topics in cosmology: structure formation, dark energy and recombination
… Dark matter halos are the collapsed dark matter structures in the late time evolution of the universe, whose existence is vital for the formation of galaxies in the Universe as they act as the potential wells where normal matter (collectively called Baryons) can accumulate, cool, and form stars. …
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Tertiary packing effects on secondary structure formation in proteins
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Dynamics of Flow-Induced Structure Formation in Drag Reducing Polymer Solutions
Work on the effects of strong shear on the molecular weight stability finds small degradation in the polymers' average molecular weight and molecular weight distribution. Experiments with HPAM and PAM solutions in a large channel flow loop at Re ≥ 20,000 provide evidence of the importance of …
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The Dynamics of Phase Separation and Structure Formation in Phase Inversion
… domain growth and locks-in nonequilibrium structures. Light scattering measurements made on ternary solutions consisting of an amorphous poly(methyl methacrylate) dissolved in various ratios of 1-methyl-2 pyrrolidinone (solvent) and glycerin (nonsolvent) show that the domain growth rate …
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The influence of structure formation on the evolution of the universe
The next generation of telescopes will usher in a new era of precision cosmology capable of determining key parameters of a cosmological model to percent level and beyond. For this to be effective, the theoretical model must be understood to at least the same level of precision. A range of subtle …
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Theoretical and Experimental Studies of Structure Formation in Polymer Solutions Under Flow
… modeling the phenomenon of flow-induced structure formation in polymer solutions. Flow-induced stresses cause changes in the free energy of the polymer solutions and can eventually lead to phase separation. The thermodynamic behavior of random polymer coils under stress is treated as …
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The rheo-optics of shear thickening and structure formation in polymer solutions
… in order to ascertain the connection between structure formation and the phenomenon of shear-thickening. Transient and steady state measurements of the viscosity, dichroism, birefringence and associated orientation angles were carried out in decalin and bromobenzene in the semi-dilute region …
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Structure Formation and Crystallization in Two-Phase Polymer Blend Flows (Fibers, Polyethylene, Polypropylene)
… stationary seed, the other involving a droplet deformation and bursting mechanism. In both cases, oriented, fibrillar crystallization of the high density phase was observed optically and correlated with calculations indicating the presence of flow-induced extensional gradients. Morphological, …
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Phase behaviour and structure formation of alginate-protein composite gels used in 3D bioprinting
… of different protein characteristics on the structure development. The overall aim of this thesis was to investigate the structure formation of alginate-gelatin composite gels and provide a scientific foundation for replacing gelatin with plant-based proteins – specifically, commercial pea …
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FROM GENE TO STRUCTURE: Formation of Iduronic Acid in Dermatan Sulfate by Two DS-epimerases
… and glucuronic acid/iduronic acid. Formation of iduronic acid through epimerisation of glucuronic acid is a key modification in dermatan sulfate biosynthesis. In the present thesis two enzymes have been identified that catalyzes this reaction, i.e. DS-epimerase 1 and 2. By using …
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Immunological synapse arrays : patterned protein surfaces that modulate immunological synapse structure formation in T cells
… that triggers assembly of a complex microscale structure at the T cell-APC interface known as the immunological synapse (IS). It remains unresolved whether the unique physical structure of the synapse itself impacts the functional response of T cells, independent of the quantity and quality of …
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