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.
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Showing 1 to 20 of 36 for “"least-squares fitting"”.
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Testing general relativity using millimeter wavelength radio interferometry of Sgr A*
… was considered. Non-imaging techniques using least-squares fitting of a simple ring and gaussian model to VLBI amplitudes and closure phases were considered. The Hough transform is not able to place strong constraints on black hole parameters. Least-squares fitting techniques indicate possible …
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Reference interferometry techniques for nanodetection and biosensing
… these devices across detection systems. Using a least squares fitting method on simulated results, it is shown that the parallel Mach-Zehnder can detect resonant wavelength shifts of the microcavity down to hundreds of attometers, provided sufficient system stability. Furthermore, a cavity …
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An X- and Q-band electron paramagnetic resonance study of Mn2+ in a single crystal of NH4Cl0.9I0.1 in the temperature range 77-295 K
… parameters, whose parameters are determined by fitting the various resonance line positions obtained for several angular orientations of the magnetic field relative to the crystal axes. A set of initial parameters is then determined by second-order perturbation theory. These are then rigorously …
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QT-interval adaptation to changes in autonomic balance
… constant of the sympathetic nervous system by least-squares fitting of the QT time series resulting from step perturbations in autonomic balance. This study is carried out on graded head-up tilt test data. Our results demonstrate the potential of QT interval variability as a non-invasive …
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High-resolution spectroscopy of propargyl radical
… Then these upper state energies were fitted by a least squares fitting program and the upper state rotational constants A, B, C and centrifugal distortion constants $\rm\Delta\sb{K},\ \Delta\sb{NK}$ and $\rm\Delta\sb{N}$ together with the band origin $\nu\sb1$ were obtained from the fitting. K = …
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A theoretical analysis of interstitial hydrogen : pressure-composition-temperature, chemical potential, enthalpy and entropy
… the results to experimental data. We find a least squares fitting of the model to the entropy and enthalpy results in model parameters which seem physically reasonable. The resulting model appears to provide a natural physical explanation for the dependence of the excess entropy on loading.
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Reynolds stress measurements downstream of a turbine cascade
… for mean velocities and turbulence quantities by least-squares fitting procedures was developed. This measurement technique was verified in a fully-developed turbulent pipe flow; the results show the accuracy of the probe when used in an end-flow orientation at various incidence angles and with a …
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IN-CORE MEASUREMENT OF DELAYED-NEUTRON PARAMETERS.
… for a given reactor system. The method uses a least-squares fitting technique to simultaneously fit a series of transient responses produced by step changes (or rapid ramps) in reactivity of arbitrary size. The function which is least-squares fit is the exact analytic solution describing a …
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Equilibrium and stability studies of plasmas confined in a dipole magnetic field using magnetic measurements
… reconstruct the plasma pressure profile through least-squares fitting to model profiles. Although both isotropic and anisotropic models are used, the latter is critical in deducing the correct beta values for the electron cyclotron resonance heated (ECRH), anisotropic LDX plasmas. The simpler …
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Binary actuation of solar mirrors
… data point for each actuator, and by using a least squares fitting of a large subset of data. The iterative model assumes that each actuator adds some constant value, similar to the previous model, and that it also adds some portion of the current angle. A multiplication and shift are …
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In silico cell biology and biochemistry: a systems biology approach
… of biological networks from time series data by least squares fitting will then be introduced. Using a set of carefully designed inference rules one can gain important information about the system which can aid in the inference process. The application of the method to a data set from the …
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Modal analysis of vertical array receptions for the Heard Island Feasibility Test
… depth to the vertical extent of the modes, and fitting the data using a least squares modal decomposition. The least squares performance given a subsampled basis set of modes was studied and improved upon through the use of diagonal loading. Lack of array orientation data hindered the analysis, …
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Single Transponder Range Only Navigation Geometry (STRONG) applied to REMUS autonomous under water vehicles
… the REMUS architecture. This approach uses a least squares fit routine coupled with restrictive geometry and simulated annealing vice Kalman filtering and state vectors. In addition, to provide maximum flexibility, the single transponder was located on a GPS equipped surface ship that was free …
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Single Transponder Range Only Navigation Geometry (STRONG) applied to REMUS autonomous under water vehicles
… the REMUS architecture. This approach uses a least squares fit routine coupled with restrictive geometry and simulated annealing vice Kalman filtering and state vectors. In addition, to provide maximum flexibility, the single transponder was located on a GPS equipped surface ship that was free …
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Fast Polarizable Force Field Computation in Biomolecular Simulations
… an accurate and robust predictor based on least squares fitting, and two non-stationary iterative methods whose fast convergence is empowered by a simple preconditioner. Furthermore, with these methods, we show that the self-consistent approach with a larger timestep is faster than the …
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The integrated Sachs-Wolfe effect with Planck and the 2Mass Photometric Redshift Catalogue
… density distribution, was measured through least squares fitting of the theoretical prediction of the galaxy auto-correlation function in each redshift shell.The bias values were then used to rescale the theoretical predictions for the matter-CMB crosscorrelation functions in each shell. The …
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Coupling qualitative and quantitative analyses of pharmaceutical materials enabled by second harmonic generation microscopy
… used in conjunction with an iterative, nonlinear least-squares fitting algorithm to discriminate polymorphic crystal forms of the small molecule D-mannitol. Finally, to extend the linear dynamic range of photon counting measurements as described here-in, a novel digital filter derived from linear …
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Electron spectroscopic characterization of corrosion reactions of active metal systems.
… data interpretation through the use of least-squares fitting techniques.
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Experimental and computational techniques in carbon-13 NMR
… time, greatly facilitating iterative nonlinear least squares fitting of experimental spectra. This algorithm has been modified to produce partially relaxed lineshapes and spectra of partially ordered samples.;Calculations for rapidly spinning samples show that spin-lattice relaxation time ( T1Z …
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