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 17 of 17 for “"multilayered structures"”.
-
Multilayered Structures under large Bending: Finite Solution and Bifurcation Analysis
Finite plane strain bending is solved for a multilayered elastic–incompressible thick plate. This multilayered solution, previously considered only in the case of homogeneity, is in itself interesting and reveals complex stress states such as the existence of more than one neutral axis for certain …
-
Classical and mixed multilayered plate/shell models for multifield problems analysis
… in this work to study multifield problems for multilayered structures. The dissertation is organized in three main parts: - an extension of the geometrical relations and constitutive equations to multifield problems and multilayered plates and shells; - the introduction of Carrera’s Unified …
-
Modeling dynamic impact of layered structures
Multilayered metals have been shown to display unusual strength as compared to bulk materials because interfaces act as barriers to slip transmission. Results from atomistic studies of mechanical properties of material interfaces can be combined with continuum mechanics approaches to simulate …
-
Three-dimensional nanofabrication of photonic crystals and polarization splitters and rotators
… tolerance in optical information processing, multilayered structures with both minimum feature sizes and layer-to-layer overlay accuracy down to a few of nanometers are required, thus posing significant challenges in fabrication. Some requirements, such as nanometer-level spatial coherence, …
-
Microstructure and Mechanical Properties of WE43 Alloy Produced Via Additive Friction Stir Technology
… powder and rolled plate as filler material, into multilayered structures. It was found that the WE43 alloy made by AFS exhibited nearly isotropic tensile properties. With aging these properties exceeded the base material in the T5 condition. The toughness measured by Charpy impact testing also …
-
Free Vibrations and Static Deformations of Composite Laminates and Sandwich Plates using Ritz Method
… of rectangular laminates, and sandwich structures. Admissible functions in the Ritz method are chosen as a product of the classical Jacobi orthogonal polynomials and weight functions that exactly satisfy the prescribed essential boundary conditions while maintaining orthogonality of the …
-
Lattice Relaxation by Plastic Flow and Study of Apparent Critical Layer Thickness in II-VI/GaAs(001) Heterostructures
… by plastic flow in semiconductor heterostructures. It is applicable to graded and multilayered structures, allows for changes of temperature or growth rate, and accounts for differential thermal expansion. For the implementation of this model we consider an arbitrary structure divided …
-
Design of an in-situ ellipsometer
… interfaces and thin films. The fabrication of multilayered structures, which can consist of several hundred layers, by sputter deposition of two materials having different refractive indices requires careful control of the individual layer thicknesses. In-situ monitoring of the deposition …
-
Growth and Characterization of Type-II Submonolayer ZnCdTe/ZnCdSe Quantum Dot Superlattices for Efficient Intermediate Band Solar Cells
… as well as electrical properties of these multilayered structures. Finally, a preliminary device fabrication has been performed, which will provide definite guidelines towards optimization of an actual intermediate band solar cell structure.</p> <p>To restate, the objective of this thesis …
-
Functional heterointerfaces via electromodulation spectroscopy
… different organic semiconductors in blended and multilayered structures. This thesis is primarily concerned with the energy level alignment and the interfacial electronic structures at functional heterojunctions encountered in electronic devices made with solution-processable semiconducting …
-
Directed transport of superparamagnetic microbeads using periodic magnetically textured substrates
… magnetic field from patterned magnetic micro structures or domain walls in magnetic nanowires. Recently, many studies have focused on sub-micron sized antidot array of magnetic materials because non-magnetic holes affect the micromagnetic properties of film. In this work, a method is presented …
-
Refined and advanced shell models for the analysis of advanced structures.
Structures technology for aerospace systems includes a wide range of component technologies from materials development to analysis, design and testing of the structures. The main improvements in future aircraft and spacecraft could depend on an increasing use of conventional and unconventional …
-
Multiscale Mechanics of Graphene Oxide and Graphene Based Composite Films
… novel methods developed in this work to study GO multilayered structures were also applied to study the mechanics of graphene-TiO2 composites. It was found that a critical thickness range of TiO2 deposition on graphene is required for the observed stiffness enhancement effect of graphene to …
-
Magnetism and spin transport studies on indium tin oxide
… the performance of some metal ferromagnet/oxide multilayered structures was investigated. The investigations revealed a significant contribution to both the magnetic and magnetotransport properties from a superparamagnetic component giving some insight into the importance of the quality of …
-
Metallic Magnetic Hetrostructures
… conventional spin valves (SV) and related structures. In SV layered structures, two ferromagnetic layers are separated by a non-magnetic spacer. Under an external magnetic field, the relative orientation of the magnetization changes in the ferromagnets, exhibiting the giant magnetoresistive …
-
Ingeniería de estructura y composición de nitruros componentes de transistores HEMT de nueva generación
… all involved in the developed HEMT heterostructures. These studies included advanced transmission electron microscopy techniques, such as inline electron holography, or valence electron energy loss spectroscopy. The electronic properties of the systems are also tested, which allow …
-
Analysis of periodic structures using finite-difference time-domain method
Periodic structures are of great importance in electromagnetics these days due to their wide range of applications such as frequency selective surfaces (FSS), electromagnetic band gap, periodic absorbers, metamaterials and many others. The aim of this work is to develop several algorithms to …