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 18 of 18 for “"flux method"”.
-
Laminar burning velocity of hydrogen and flame structure of related fuels for detailed kinetic model validation
… correction available in the literature. The heat flux method was employed for the first time to measure the laminar burning velocity of lean H2 + air mixtures and its temperature dependence. A modified procedure for processing data from unstable cellular flames was suggested, and its accuracy was …
-
Flux Growth of Single Crystal Lead-Titanate and Property Measurements
… equidimensional crystals free of defects. A flux method was developed for the growth of single crystals at reduced temperatures. High quality crack-free crystals were obtained below the transformation temperature, with well developed (100), (010) and (001) faceted faces.
-
Diagnostics of diapycnal diffusion in z-level ocean models
… are<br/>introduced: (i) The divergence method based on the work of Ledwell<br/>et al. (1998) infers the mean diapycnal diffusivity from the<br/>advection-diffusion equation. (ii) The tracer flux method based on the work<br/>of Griffies et al. (2000), that determines the diapycnal flux …
-
Radiative heat transfer from aluminum oxide in solid propellant flames
… optical properties were obtained by an implicit method involving the Mie scattering theory and a solution of the radiative transfer equation. Equations predicting the complex index of refraction for liquid Al$\sb2$O$\sb3$ as a function of wavelength and temperature were obtained by performing a …
-
THE SYNTHESIS, CHARACTERIZATION, AND UPCONVERTING PROPERTIES OF ERBIUM DOPED; YTTERBIUM, ERBIUM CO-DOPED YTTRIUM OXYSULFIDE PHOSPHORS UNDER 808, 980, AND 1560 nm EXCITATION
… phosphors were prepared using the polysulfide flux method. The morphology and structure was characterized using transmission electron microscopy and x-ray powdered diffraction. Visible emissions occurring near 530 and 550 nm and 660 - 670 nm consistent with the 2H11/2, 4S3/2 → 4I15/2 and 4F9/2 …
-
Método de decomposição de domínios de múltiplos passos de tempo de Dirichlet-Neumann aplicado à injeção de polímeros em meios porosos
… we propose a space-time domain decomposition method based on a predictor-corrector strategy. The resulting system of equations is discretized by the finite element method and linearized by the Newton-Raphson method. Additionally, we apply a consistent flux method to obtain the flow at the …
-
Direct simulation Monte Carlo (DSMC) in micro flows
… direct simulation Monte Carlo (DSMC) method can be applied to micro flows simulation in a wide Kn range. The objective of this thesis is to develop the DSMC algorithm and apply it to study micro flows. In present work, the algorithm of DSMC suitable for micro flows is developed with …
-
COMPOSITION AND PRESSURE DEPENDENT STUDY ON WEYL SEMIMETAL Mo1-xWxTe2
… 0.90, and 1 were synthesized using the self-flux method (for parent compounds MoTe2 and WTe2) and the chemical vapor transport method (for doped compounds). The single crystals were then characterized by energy- dispersive X-ray spectroscopy and X-ray diffraction (XRD). Temperature-dependent …
-
Quantitative analysis of the extracellular glutamate concentration of the nucleus accumbens
… data using the "extrapolation to zero flow" method because there was no evidence of asymptotic yield within the range of flow rates that could be tested. An estimate of the normal NAS extracellular glutamate concentration (4.0 $\pm$ 0.8) was obtained using the no-net-flux method. The …
-
Intragranular Tungsten-Titanium Carbide Composite Ceramics via Gas-Solid Displacement Reactions
… study details the use of a liquid aluminum flux method to improve precursor quality by enabling synthesis of (Ti1<sub>-x</sub>W<sub>x</sub>)C powders with enhanced homogeneity and Mono crystallinity. The final report details the application of the previously reported gas-solid reaction …
-
Study of growing incongruent antiferromagnetic single crystals and characterization
… solid-state synthesis. Here, multiple synthesis methods for single crystals of the metallic antiferromagnets Fe2As, FeSn, and Cr2Al were investigated. The chemical vapor transport (CVT) has been used to assemble large crystalline grains below their melting/decomposition temperatures. In this …
-
Unconventional Superconductivity in the Layered Iron Germanide YFe2Ge2
… In this thesis, I present the crystal growth methods which have successfully produced high-quality poly- and single-crystal YFe$_2$Ge$_2$ samples. Measurements on these samples have led to conclusive evidence that superconductivity is an intrinsic property of this compound. Disorder effects on …
-
Variations in the particulate flux of ²³⁰Th and ²³¹Pa and paleoceanograhpic applications of the ²³¹Pa/²³¹Th ratio
… and in deep-sea sediment cores. New analytical methods for uranium, thorium, and protactinium isotopes by Inductively-Coupled Plasma Spectrometry (ICP-MS) with a conventional Meinhard concentric glass nebulizer were developed. Composite samples from sediment traps deployed a year or longer in …
-
Investigation of the optical properties of Bi₂Sr₂Ca<sub>n-1</sub>Cu<sub>n</sub>O<sub>y</sub> (n=1,2) by transmission electron energy loss spectroscopy
… developed which included a direct convolution method for removing the contributions of multiple scattering from the data. The spectrometer is running very well. Samples can be changed routinely without disturbing the performance of the spectrometer. The research conducted for this thesis was an …
-
High Performance Lead--free Piezoelectric Materials
… KNN. K0.5Na0.5NbO3 single crystals grown by the flux method were characterized for their ferroelectric and piezoelectric behavior and dynamical scaling analysis was performed to reveal the origin of their moderate piezoelectric performance. Optical birefringence technique used to reveal the macro …
-
The Impacts of Particle Size Distribution and Electrode Structuring on NMC Cathode Performance
… NMC811 particles were prepared using the molten flux method. Using the NMC111 particles, three model electrodes with different particle size distributions were fabricated: one ‘Small’, one ‘Big’, and one ‘Mix’. It was thought that the reactivity difference between the big and small particles in …
-
Optical transport of pseudo-random coatings
… on the susceptibility. To do this we developed a method that relies on a Monte Carlo algorithm to efficiently obtain higher orders of this series expansion. Therefore, this new methodology permits the study of higher order micro-structural parameters. In this thesis I will analyse up to fourth …
-
Caratterizzazione di membrane metalliche e ionomeriche per applicazioni energetiche
… procedures: a stirred batch and a continuous flux method. Pure palladium as well as Pd-Ag membranes were produced: the Pd-Ag membranes’ composition is calculated to be close to 77% Pd and 23% Ag by weight which was the target value that correspond to the best performance of the palladium-based …