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 68 for “"Superstructures"”.
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Superstructures of Magnetic Materials
This dissertation reports on the results of studies on magnetic materials as the ternary carbide SmNiC2 and the perovskite-related layered compounds La5(Ti0.80Fe0.20)5O17 and La6(Ti0.67Fe0.33)6O20. Studies were performed with single-crystal X-ray diffraction and subsequently refinement and analysis …
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A geometric programming based procedure to design bridge superstructures
The routine procedure for designing bridge superstructures relies heavily on the past experience of the designer and is extremely time consuming and costly to try out alternative designs. Typically, a designer is more concerned about satisfying the design requirements laid down by the American …
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TDDFT calculations for excitation spectra of solids and superstructures utilizing mGGA
The first principles study plays a very important role in developing new generation of materials, such as organic semiconductors and long polymer chains, as well as understanding of physical properties of nanoparticles , inorganic semiconductors and semiconductor alloys. In this work, we start from …
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Feasibility of fiber reinforced composite materials used in highway bridge superstructures
… here as structural materials of highway bridge superstructures. Bridge deck designs can be done according to <i>AASHTO</i>¹ specification and elastic design concepts. In order to evaluate the feasibility of composites as structural materials of highway bridge superstructures, composite materials …
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Optimal control of wave-induced vibrations in semisubmersible structures with flexible superstructures
This dissertation is concerned with controlling the motion of a semisubmersible structure induced by high-frequency waves. The structure consists of a rigid platform and a flexible superstructure. Motion of a structure in fluids generates forces depending on the motion itself. The added mass and …
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Turbulent Boundary Layer Superstructures Near the Wall and Their Relationship to Wall-Pressure Fluctuations
Turbulent boundary layer superstructures are characterized as regions of organized coherent motions that are on the order of several boundary layer thickness long in the streamwise direction and meander in the spanwise direction as they move and evolve within the boundary layer. They are presumed …
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Two dimensional magnetic surface compounds: The c(2x2) Mn-induced superstructures on the fcc-(001) surfaces of Cu, Fe, Co and Ni
In der vorliegenden Dissertation werden die elektronischen Eigenschaften der c(2x2)MnCu/Cu(001) Oberfläche untersucht. Es wird eine Möglichkeit vorgestellt, unter Nutzung verschiedener Symmetrien der Brillouinzonen, Photoemissionsspektren voneinander zu trennen und damit die energetische Position …
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Interval based MINLP superstructure synthesis of heat and mass exchange networks
… networks. The method involves generating superstructures using the temperature/composition interval concept from the physical insight approach. The superstructures are partitioned into temperature/composition intervals using the supply and target temperatures/compositions of either the …
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Structure and Reactivity of Terrestrial and Extraterrestrial Pyrrhotite
… of composition-dependent crystallographic superstructures, but little of the existing structural and microstructural complexity has been explored yet. This thesis investigates the occurrences and nature of pyrrhotite superstructures, examines the related nano- and microstructural phenomena, …
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Evaluation of Tsunami Design Codes and Recommendations for Bridges Susceptible to Tsunami Inundation
… recommendations for fluid loading on bridge superstructures. The tsunami force equations were applied to two case studies. These studies provided the opportunity to evaluate the adequacy and varying approaches in estimating tsunami forces on bridge superstructures. In some cases the same …
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Structural Vulnerability of Coastal Bridges Under Hurricane Conditions
… estimating the wave forces impacting bridge superstructures. Finally, the study compared the maximum wave forces obtained through a physics-based method with the effects of upstream currents on bridge superstructures with varying submergence ratios. The analysis concluded that the proposed …
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DNA Driven Assembly at Solid and Liquid Interfaces
… demonstrates an approach for creating novel superstructures of DNA coated colloids (DNAcc) directed via an externally applied magnetic field. Raspberry-like and long coaxial skeletons of smaller colloids around larger superparamagnetic colloidal cores in a two component system are shown. The …
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Seismic performance assessment of quasi-isolated highway bridges with seat-type abutments
… specially designed isolators between bridge superstructures and substructures. In recent years, bridge engineers of the Illinois Department of Transportation developed an innovative ""quasi-isolation"" strategy to improve bridge seismic resilience in geographical regions with low-to-moderate …
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Strength and durability of steel to composite joints for marine application
… of steel to composite<br/>joints for composite superstructures on ships where reduced weight is a design driver. The<br/>purpose of the work is to understand the long-term performance characteristics of hybrid<br/>connections to allow for improvements to the design of hybrid structures. Two …
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Novel surfactants for the production of functional nanostructured materials via the ionic self-assembly (ISA) route = Neuartige Tenside für die Synthese funktioneller nanostrukturierter Materialien durch ionische Selbsorganisation
… a property rather than a function. Since chiral superstructures have obtained much attention during the last few years, we investigated the possibility of chiral ISA materials through the use of chiral surfactants. Thus, the work involved synthesis of novel chiral surfactants and their …
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Shear Strength Assessment of Corrosion-Damaged Prestressed Concrete Girders Repaired With CFRP
… if left unmitigated, may lead to failure of the superstructures. If corrosion is present in the end regions of the beams, failure of the girders will likely be in shear, which is a sudden failure mode and not the preferred limit state. Therefore, it is beneficial to study repair practices and …
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Plug repairs of marine glass fiber / vinyl ester laminates subjected to uniaxial tension
… used and proposed for the hulls, bulkheads, and superstructures of large ships. This thesis examines the effectiveness of the repair of such laminates using glass fiber/vinyl ester chopped strand mat plugs to fill circular holes. The stress distributions around circular holes in various glass …
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Synthesis and Self-Assembly of Novel ABC Miktoarm Star Terpolymers
… terpolymers and their self-assembly into complex superstructures in aqueous solution are described within this thesis. To this aim a modular route for such materials was developed, combining anionic polymerization and copper-catalyzed azide-alkyne cycloaddition. At the example of ABC miktoarm star …
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Robust Yaw/roll Control of High-Speed Containerships
… characteristics. With the trend of higher superstructures, low density cargo, and the deck loading of containerships, major problems have arisen in regard to roll motion stabilization. To minimize the yaw/roll coupling effect on the course-keeping mode, the multivariable (MV) approach was …
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Actin dynamics in silico, in waves, and in rods
… in vitro, and single molecule imaging of actin superstructures in vivo. These advances have influenced each of our studies on multiple levels, sometimes directly. A novel analysis of single actin filament dynamics revealed faster than expected dynamics during treadmilling but not during bulk …
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