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 30 for “"orientation dependence"”.
-
Orientation dependence in three-dimensional object recognition
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 1989.
-
Orientation dependence of the acoustic backscatter for elongated zooplankton
… the backscatter cross section as a function of orientation angle is derived. A directivity pattern is determined from the analytic formula and the width of the main lobe (beam width) is computed. The relationship between beamwidth and acoustic frequency is presented in plots of beamwidth versus …
-
Orientation dependence of dielectric susceptibilities and switching characteristics in epitaxial ferroelectric thin films
When subjected to low electric field, domain walls play an important role in determining the response of ferroelectrics to applied stimuli. While contributions to ferroelectric properties from the intrinsic response of the polarization within a domain and so-called extrinsic contributions from the …
-
Theory of the general orientation dependence of ²H NMR spin-lattice relaxation and experiments on model membranes
… in the liquid crystalline phase. The general orientation dependence of spin-lattice relaxation of spin-1 nuclei interacting via fluctuating quadrupolar interactions was considered within the Redfield approximation. The NMR spectrum is characterized in terms of the principal axis co-ordinate …
-
Electronic and Plasmonic Properties of Nano-Sized Gold/Strontium Titanate Interface
… interfaces are fabricated to determine the size dependence of electronic and resistive switching properties, effect of atomic structure on the orientation dependence of electronic properties, and mechanisms of plasmon-induced current enhancement. A combination of drop-casting and high temperature …
-
A Critical Evaluation of Computational Fracture Using a Smeared Crack Approach in MPM
… that represent the deformable solid. A grid orientation bias in the numerical results is demonstrated. Solution accuracy is lost when failure surface and grid line orientations are not aligned. Causes of the grid orientation dependence are identified, but the problem remains unresolved. …
-
Towards mechanism-based constitutive modelling of L1₂ crystal plasticity
… strength with increasing temperature, strong orientation dependence of the yield stress, tensioncompression asymmetry, and small strain rate sensitivity. Some ideas on revising the plasticity model have been presented. Though not completed, the new approach points to promising future …
-
Nuclear magnetic resonance studies of the organic superconductor kappa-(bisethylenedithiotetrathiafulvalene)(2) copper(nitrogen(cyanide)(2))bromine
… for temperatures 2 K $$ 4.3 T). We studied the orientation dependence of this rapid relaxation and found that the extra relaxation disappeared when the magnetic field was oriented very close ($\le3\sp\circ$) to the superconducting layers. This was taken to be strong evidence that fluxoid motion …
-
The effects of polymer-controlled hydration on nuclear magnetic resonance parameters
… The spin-spin relaxation times did show an orientation dependence. The analysis led to the proposal that thickness fluctuations and thermal undulations of the membrane were two possible mechanisms for this relaxation.
-
Backscatter And Attenuation Properties Of Mammalian Brain Tissues
… tissues focusing on backscatter and attenuation. Orientation dependence and spatial averaging of data were analyzed using the same method resulting from insertion of tissue sample between a transducer and a reference reflector. Apparent Backscatter Transfer Function (ABTF) at 1 to 10 mhz, …
-
The Effect of Stress State and Precipitation on Stress-Induced Martensitic Transformations in Polycrystalline and Single Crystal Shape Memory Alloys: Experiments and Micro-Mechanical Modeling
… in NiTi. Using the model, the decrease in the orientation dependence of $\sigma\sb{\rm cr}$ is linked to the unique orientation relationship that exists between the coherent precipitates in NiTi and the martensite correspondence variant pairs. As experimentally observed the model predicts that …
-
Characterization of Delamination in 2099-T861 Aluminum-Lithium
… such as rate insensitivity and crystallographic orientation, were incorporated into a cyclically stable crystal plasticity framework with rate independent kinematic hardening. It was hypothesized that texture lead to interface stresses that could not be obtained by a continuum approach. Local …
-
Ab-initio molecular dynamics studies of laser- and collision-induced processes in multielectron diatomics, organic molecules and fullerenes
… will be investigated. This concerns, the orientation dependence of the ionization of multielectronic diatomics (N2, O2), the isomerization of organic molecules (N2H2) and the giant excitation of the breathing mode in fullerenes (C60). In the second part, fullerene-fullerene collisions are …
-
Structure-Property Relationships: Model Studies on Melt Extruded Uniaxially Oriented High Density Polyethylene Films Having Well Defined Morphologies
… properties and deformation morphologies, 2) orientation anisotropy of the dynamic mechanical α relaxation, 3) orientation dependence of creep behavior, and 4) crystalline lamellar thickness and its distribution. For the first three topics, appropriate mechanical tests, including tensile …
-
Magneto-optical and multiferroic oxide thin films, integrated nonreciprocal photonic devices and multiferroic memory devices
… (Ce:YIG) films. The spectral and substrate orientation dependence of the magneto-optical figure of merit of epitaxial Ce: YIG on GGG substrates show very high magneto-optical figure of merit (379-400° dB-1 at [lambda] = 1550 nm for all substrate orientations). The thermal budgets of Ce: YIG …
-
Study of layer orientation on the fracture behavior of two additively manufactured thermoset resins, A
… of applications. Specifically, the role of print orientation on the quasi-static and dynamic fracture response of two distinct AM polymer materials, DA-3 and PM-EM828, is presented. While predictive simulations often leverage quasi-static fracture criterion, impulsively loaded cracks can have …
-
Exploration of helicase mechanisms at single molecule level: answering decades old questions and bioengineering super proteins
… by stabilizing the active form. Lastly, the orientation dependence of FRET is experimentally shown between nucleic acid conjugated cyanine fluorophores that constitutes the first demonstration of this effect in a biophysical system since its formulation by Theodor Förster in 1948.
-
Exploration of helicase mechanisms at single molecule level: answering decades old questions and bioengineering super proteins
… by stabilizing the active form. Lastly, the orientation dependence of FRET is experimentally shown between nucleic acid conjugated cyanine fluorophores that constitutes the first demonstration of this effect in a biophysical system since its formulation by Theodor Förster in 1948.
-
Microplastic deformation of polycrystalline silver chloride containing a small volume fraction of hard inclusions
… incorporates the matrix friction stress and the orientation dependence of a dislocation's line energy. Additionally, the role that grain triple junctions and inclusions play in the nucleation of slip is considered. Statistical tests show slip is independent of inclusion location for diameters …
-
Studies of the orientational order and bilayer thickness in biological and model membranes
… of cholesterol which is known to increase the orientational order in the hydro-carbon region, it appears that a small fraction of the cholesterol is solubilized by the membrane. A significant fraction of membrane cholesterol, however, is excluded from the lipid bilayer of the microorganism or …
Page 1 of 2