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 67 for “"structural modification"”.
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Structural modification utilizing beam elements
This study presents a concept that provides a structural dynamicist the ability to analyze the effects of making sophisticated (beam-type) structural changes to a structural system whose modal database is known. The modification technique combines the Dual Modal Space Modification Method (DMSM) and …
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Analysis of vibration reduction via local structural modification
As a new technique for structural dynamic analysis, local structural modification is playing a more and more important role in solving practical engineering problems. This thesis develops methods for vibration reduction via local structural modification. In this thesis, the reduction of unwanted …
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Structural Modification of Interfaces for Sustainable High-Performance Batteries
… This cumulative dissertation shows how structural interface modifications can help to overcome these difficulties and enable multifunctional battery components. A key aspect is the Nanoscale Sculpturing process. The formed 3D surface enables mechanical interlocking between the current …
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EFFECTS OF STRUCTURAL MODIFICATION ON RELIABILITY OF NANOSCALE NITRIDE HEMTs
… into the semiconducting barrier layer and structural modifications (defect ii formation) leading to diminished polarization induced charge density and output current. Since the dynamical system to be studied is complex, chaotic (where the evolution rule is guided by atomicity of the …
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Methods for the structural modification and characterization of bacterial glycans
Despite the importance of carbohydrates in cellular processes, there are few tools for their study in the context of a cell. The finding that non-natural monosaccharides could be internalized, processed, and displayed in cellular glycans in the early 1990s led to the development of metabolic …
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Reactive Sieving With M-Phenylene Ethynylene Foldamers: Effects of Structural Modification on Reactivity
In an attempt to further understand the nature of the host-guest interaction between mPE foldamers and the methylsulfonate esters used to study reactive sieving, a set of parameters for both the mPE foldamer and the methylsulfonate guests were developed for CHARMM-based molecular dynamics …
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Hexagonally-Packed Helical Oligo(m-Phenylene Ethynylene) Nanotubules via Structural Modification and Guest Templation
… In addition, research expanded upon the general structural diversity of these oligomers, the forces responsible for the folding event, and possible applications for these systems. A review of the field of foldamers is presented, detailing the current literature concerning non-biological oligomers …
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Bioactivity evaluation and structural modification of Bowman-Birk type protease inhibitory peptides from amphibian skin secretions
Frog skin can produce secretions containing complex chemical components in a holocrine manner. On the one hand, these chemical molecules play an important role in the physiological functions and defence systems of frogs. On the other hand, they provide the main source for the development of new …
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Synthesis of Bicyclic and Tricyclic Analogues of Oxazolidinone
… Using similar synthetic strategy and subsequent structural modification, the fused tricyclic piperazine analogues of ANB-22/40 have been successfully obtained as well.</p><p>The application of the intramolecular azide-alkyne cycloaddition leads to the tricyclic fused …
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Characterisation and modification of hydrogel polymers
… states and the second some aspects of the structural modification of polymers. The characterisation of hydrogel polymers in their dehydrated state (xerogels) involves such techniques as elemental analysis, pyrolysis gas liquid chromatography, infra-red spectroscopy, density determination …
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Spectroscopic characterization of dry etch-induced modification in III-V semiconductors and semiconductor heterostructures
The effects of dry etching on the structural and electrical properties of III-V semiconductors and semiconductor heterostructures were studied using vibrational and electronic Raman spectroscopy and low and room temperature photoluminescence spectroscopy. The frequency, intensity, and lineshape of …
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Design and Synthesis of Polymer Networks and Branched Polymers for Triggered Deconstruction of Self-Assembly
… performance to the parent. Next, we show that structural modification of these molecular additives to include a crosslinking site enables equivalent material deconstruction compared to first generation additives, but with improvements in material thermomechanical performance. Alternative …
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Novel metal- and main group-catalyzed methods for modulating molecular oxygenation
… functionality as a synthetic handle to enable structural modification of organic molecules; therefore, methods that enable new ways to modulate oxygen content in molecular structure facilitate structural diversification. This thesis details the development of catalytic methods affecting oxygen …
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Calibração automática de modelos tipo chuva-vazão utilizando técnicas de suavização: uma aplicação ao modelo SMAP-II
… The technique developed presents a previous structural modification of a typical model to obtain the objective function explicit in terms of parameters. The threshold structures that implicate in "if’s" structures, generators of discontinuites, were replaced by smoothing functions thereby …
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A layered sodium titanate as promising anode material for sodium ion batteries
… varying Na vacancy ordering. An irreversible structural modification upon overcharging is also confirmed by in situ XRD. In summary, our work demonstrates that 03-NaTiO2 is a very promising anode material for sodium ion batteries with high energy density.
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Study of Spin Configuration of Hexagonal Shaped Ferromagnetic Structures
… is able to perform in-situ magnetic imaging, structural modification and electrical transport measurement on ferromagnetic structures. For the latter, hexagonal ferromagnetic structures were investigated due to its uniqueness of having a vortex state with well-defined, symmetric and moderate …
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Reconciliation of a Rayleigh-Ritz beam model with experimental data
In order to perform structural optimization and/or modification on a structure, an analytical model which sufficiently describes the behavior of the structure must be developed. Analytical models can be generated for almost any structure, but such a model will generally not effectively predict the …
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The upper ocean structure of the Antarctic circumpolar current in the vicinity of the South-West Indian ridge
… the ABFZ, was to study the dynamics and the structural modification of the Antarctic Circumpolar Current (ACC) when it encounters the complex SWIR. High sea surface variability has been observed at the southwest Indian sector of the Southern Ocean, specifically at and around 50°S;30°E. As the …
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Scanning tunneling microscopy investigation of atomically precise graphene nanoribbons
… (eGNR) and the hybrid GNR (hGNR) elucidate how structural modification alters the bandgaps of GNRs. The increased lateral extension of the eGNR was found to result in a bandgap of 2.66 eV. The hGNR bandgap was found to be 1.8 eV, in agreement with computational modeling. The hypothesis that …
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Performance Improvement through Velocity Triangle Optimization-Driven Redesign for Mitigating the Horseshoe Vortex in Axial Turbines
… such flow instabilities requires turbine blade modification to discourage boundary layer roll-up, but traditional structural modification design systems can be prohibitively complex and time-intensive.</p> <p>To address this problem, this study contributes a blade modification method involving …
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