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.
Results
Showing 1 to 20 of 64 for “"Novel structures"”.
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Novel structures for lattice-mismatched infrared photodetectors
… decided to investigate the use of nBn detector structures as lattice mismatched photodetectors. Using a design based on an InAsSb bulk-material absorber, a comparison was again drawn between two samples, one grown on mismatched GaAs and a second grown on native GaSb. This time, device dark …
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Novel Structures for Scalable Vertical Gallium Nitride Power Devices
… energy and defined by pervasive electrification, novel power devices must be developed to address the increasingly stringent demands for high power density and efficiency. In this thesis, the theory and fabrication of several new gallium nitride (GaN) power devices will be developed to push beyond …
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Synthesis and Characterization of Amorphous Cycloaliphatic Copolyesters with Novel Structures and Architectures
A series of random and amorphous copolyesters containing different cycloaliphatic rings within the polymer chains were prepared by melt polycondensaton of difunctional monomers (diesters and diols) in the presence of a catalyst. These polyesters were characterized by nuclear magnetic resonance …
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Novel Structures of RAD51 Reveal Mechanisms in DNA Damage Repair and Genomic Stability
… In this thesis I present three-dimensional structures of RAD51 nucleoprotein filaments together with biochemical and biophysical data that reveal new insights into how RAD51 contributes to maintaining the stability of our genome. High-resolution structures of RAD51 filaments on single- (ss-) …
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Synthesis and Characterization of Poly(arylene ether sulfone)s with Novel Structures and Architectures
… groups of polysulfones by this method. A novel cyclohexyl-containing difunctional monomer was prepared and successfully incorporated into poly(arylene ether sulfone) backbones. These polymers were characterized by NMR, SEC, DSC, TGA, DMA and tensile tests and compared to terephthaloyl …
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GEOMETRY AND MORPHOLOGY OF TiO2 AND Fe2O3 NANOTUBES FOR SOLAR PHOTOLYSIS OF WATER
… samples. The structural properties of these novel structures have been studied extensively. In addition to this, smooth and ultra thin walled α- Fe2O3 nanotubes were synthesized using a sonoelectrochemical anodization technique. A photocurrent density of 1.41 mA/cm2 was observed for hematite …
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Resonant Cavity Enhanced Photodetectors and Optoelectronic Switches
Described in this thesis is an investigation of novel structures consisting of optoelectronic devices integrated into Fabry-Perot resonant cavities. The photosensitivity of conventional detectors is governed by the optical properties of the semiconductor material requiring thick absorption regions …
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A study of novel mid-infrared optical devices: Wave plates and tunable filters
… partially address this problem by proposing two novel structures using subwavelength gratings. First, we look at a wave plate design that uses a physical path length difference to impose a phase shift between the components of incident light as an alternative to costly birefringent crystals. …
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Femtosecond-Laser-Enabled Fiber-Optic Interferometric Devices
… continue to offer vast opportunities to create novel structures for sensing applications. This dissertation focuses on design, fabrication and characterization of optical-fiber based interferometric devices for sensing applications. Three novel devices have been proposed and realized, including …
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Bis(pentafulven)komplexe des Titans
… IV pentafulvene compounds has been expanded with novel structures and reaction patterns. The reactions presented in this thesis confirm the miscellaneous chemistry of pentafulvene titanium complexes, which ranges from simple addition and insertion reactions to the activation of C-H und H-H bonds.
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Stress and release : chemical modulation of secondary metabolite production in Aspergillus sp.
… isolated aspulvinones revealed both known and novel structures. Inducer concentration had a significant impact on aspulvinone profile. Bioassay revealed previously unreported antibacterial activity for the aspulvinones. A high-throughput colorimetric screen was designed to probe the response. …
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Generative Diffusion Models Towards De Novo Protein Design
… with desired functions by rationally engineering novel protein structures and sequences. The structure requires modeling continuous 3D coordinates of atoms with rigid biochemical constraints of the polymer chain while the sequence is a series of discrete amino acids that should fold into a …
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Formulation, physicochemical and rehydration properties of whey protein powders containing nanoparticulated whey protein structures
… regulatory considerations. This thesis examines novel whey protein structures (NWPS) and is comprised of four chapters, with the first chapter examining the future of food formulation and the role of whey proteins, specifically in the context of clean label and sustainable food systems. As a …
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Mechanisms and impact of alternative transposition-induced segmental duplications
… generate tandem direct duplications (TDD) and novel structures termed Composite Insertions. Genomic study revealed that these mechanisms have played an important role in generating TDD in 8 of 22 examined plant genomes. We also found a significant dosage-dependent effect of a 14.6 Mb …
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Digital projection photochemical etching for gray-scale semiconductor applications
… digital projection photochemical etching, a novel and dynamic semiconductor fabrication technique that achieves a 3-dimensional structure in a single etch step. This technique utilizes a commercial digital projector to focus a substantially de-magnified image beam pattern onto the …
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Investigation of a computationally predicted structure in the Ag-Pt system
… is fast becoming the chosen way to predict novel structures. These structures need to be validated in order to gain credibility and generate more confidence in computational predictions. This investigation of the equiatomic region of the Ag-Pt system shows that computational modelling can be …
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Fabrication and characterization of novel nanostructures based on block copolymer lithography
… of block copolymers into periodic nanoscale structures has drawn considerable attention as a method for pattern generation in nanolithography. One of the main challenges is to create complex nanostructures other than closed-packed nanodots or nanoholes with hexagonal symmetry, or parallel …
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Identification and functional study of a bioactive peptide QUB-2558 from the skin secretion of the Wuyi torrent frog, Amolops wuyiensis
… a wide range of bioactive substances with novel structures and functions because of their unique habitats and metabolic pathways. Antimicrobial peptides (AMPs), one of the natural products from amphibians, have become the research hotspot as new substitutes for antibiotics. This paper …
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