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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 27 for “"Diffusion parameters"”.
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The Experimental Determination of Thermal and Neutron Diffusion Parameters by The Use of Empirical Functions
Made available in DSpace on 2014-12-09T19:52:20Z (GMT). No. of bitstreams: 1 6711819.pdf: 2698287 bytes, checksum: 99514c7f5be31a47404ada7ebf8c1c96 (MD5) Previous issue date: 1967
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Pulsed neutron measurements of the diffusion parameters of heavy and light water mixtures at several temperatures
Thermal neutron diffusion parameters of O, 20, 50, 80 and 100 percent D₂O in mixtures of light and heavy water were measured by the pulsed neutron technique at room temperature (21°C), near the freezing point of the mixture in the liquid state, and at -20°C in the solid state (ice). A 250-kv pulsed …
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A measurement of the neutron diffusion parameters of water at different temperatures by the pulsed method
The neutron diffusion parameters of water and ice were measured by the pulsed source method at two temperatures; 1.0°C. and -19°C. Neutron pulses were obtained at one millisecond intervals by modulating the beam in a Cockcroft-Walton type accelerator. The ₁H³(d,n)₂He⁴ reaction was used to generate …
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The measurement of neutron diffusion parameters in heavy and light water concentrations by the pulsed neutron technique
Neutron diffusion parameter measurements have been made at 21°C in 20, 50, and 80 percent concentrations of heavy and light water, including pure H20 and D2 0 as moderators. Pulsed neutron techniques were used with a 250-kv Cockcroft-Walton accelerator as the pulsed source. The range of bucklings …
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New understandings of surface diffusion
Surface diffusion is of fundamental importance in a variety of industrial kinetic processes, including surface reactions, crystal growth and sintering. However, surface diffusion parameters are rarely used to model industrial processes, resulting from three deficiencies in the literature. First, of …
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The effect of hydrogen on the passivation process of iron
… in metals, factors influencing solubility and diffusion parameters has been reported. The experimental techniques available for studying these properties have been reviewed and the related theories of passivity compared as a foundation for proceeding with the experimental programme.
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Simulation of implantation and diffusion processes for electro-thermal microcantilevers
… and determine the corresponding implantation and diffusion parameters for the doping steps. We used a two-dimensional model to simulate the process steps for doping different regions of the electro-thermal probe using DIOS, a multidimensional process simulator in the TCAD suite. Each cantilever …
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Surface Diffusion Kinetics on Amorphous Silicon
In addition, the parameters for self-diffusion on amorphous silicon at processing temperatures (above 635°C) are determined by analyzing our own series of HSG growth experiments using chemical vapor deposition. The results of this study are compared to HSG growth data obtained from MBE growth …
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Experimental determination of the buckling for unusual geometrical shapes using paraffin
… cross section v = the neutron velocity D = diffusion coefficient C = diffusion cooling coefficient The resulting values of the diffusion parameters are: Σ<sub>a</sub> v = 4858 ± 162 sec⁻¹ D = 25911 ± 202 sec⁻¹ cm² C = 1186 ± 2558 sec⁻¹ cm⁴ By measuring the decay constant, the buckling of the …
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Development and Calibration of Reaction Models for Multilayered Nanocomposites
… evolution measurements to calibrate the diffusion parameters associated with solid state mixing (720 K - 860 K) in the bilayer.</p><p> </p><p>The equimolar Zr-Al multilayered system when reacted aerobically is shown to </p><p>exhibit slow aerobic oxidation of zirconium (in the …
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Measuring and Comparing the Diffusion Rate of Fluorescent-Lipophilic-Neurotracing Probes in Murine-Peripheral-Nerve Preparations
… trace such circuitry, it is necessary to use a diffusion-matched set of spectrally distinct dyes. The fluorescent dye molecule is composed of a fluorescent head group and two hydrocarbon chains. This thesis addresses how the molecular structure of a lipophilic-fluorescent dye affects the …
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Statistical Inference for Stochastic Differential Equations using Splitting Schemes
… extends to developing multivariate Pearson diffusion models, which generalize existing univariate Pearson diffusion frameworks by incorporating linear drift and a quadratic function in the diffusion structure. The Strang splitting scheme for nonlinear processes with Pearson-type noise is …
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A QUASIELASTIC NEUTRON SCATTERING STUDY OF WATER DIFFUSION IN FROG MUSCLE
… The spectra were interpreted with a jump-diffusion model for translational water motion in both systems and a bound-free model for water in the muscle. The measured diffusion parameters of these two systems indicate that the water motion is more restricted in the frog muscle than in the …
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Quantitative MRI correlates of hippocampal and neocortical pathology in intractable temporal lobe epilepsy
… When investigating these quantitative multimodal parameters with histological features within the hippocampal subfields, I demonstrated that MD correlates with neuronal density and size, and can act as a marker for neuron integrity within the hippocampus. More importantly, this work was the first …
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Quantitative Dwi As An Early Imaging Biomarker of The Response to Chemoradiation In Esophageal Cancer
… often preceded by changes in the tumor biology. Diffusion Weighed Imaging (DWI) is an MRI modality which is sensitive to microscopic motion of water molecules in tissue. Quantitative DWI provides a measure of the cellular microenvironment which is impacted by cellularity, extra-cellular volume …
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Improve the efficiency of conditional generative models
… a hybrid generative model that combines GANs and Diffusion-based models to alleviate the unstable training of GANs and accelerate the denoising process. The third model introduces a fine-tuning framework that utilizes pre-trained diffusion parameters for high-fidelity, fast sampling, and quick …
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Scanning Tunneling Microscopy Studies of Cluster Diffusion in a Highly Mismatched system:Copper on Silver(111)
… tunneling microscopy to investigate cluster diffusion phenomena in both the early stages of nucleation and growth and the late stages for a highly mismatched system, Cu on Ag(111). In particular, activation energies and prefactors for cluster diffusion are measured directly by tracking …
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Scanning Tunneling Microscopy Studies of Cluster Diffusion in a Highly Mismatched System: Copper on Silver(111)
… tunneling microscopy to investigate cluster diffusion phenomena in both the early stages of nucleation and growth and the late stages for a highly mismatched system, Cu on Ag(111). In particular, activation energies and prefactors for cluster diffusion are measured directly by tracking …
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Simultaneous DTI and rs-fMRI using the navigated diffusion sequence
… functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) experiments are normally performed separately. The idea of extracting inherently co-registered activation/connectivity maps and diffusion parameters has resulted in efforts to develop methods for simultaneous fMRI and …
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