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 109 for “"Spectral resolution"”.
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Sizing the X-ray spectral resolution limits of the REgolith X-ray Imaging Spectrometer (REXIS) instrument at Asteroid 1999RQ36
… will be flying on board the Origins Spectral Interpretations Resource Identification Security Regolith Explorer (OSIRIS-REx) asteroid sample return mission that will be visiting the asteroid 1999 RQ36 and sending a sample back to Earth. REXIS will detect elemental XRF lines and …
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Materials and Surface Processes at Gale Crater and the Moons of Mars Derived from High Spatial and Spectral Resolution Orbital Datasets
… about Mt. Sharp.</p><p>Disk-resolved hyperspectral observations of Phobos acquired at a range of lighting and viewing geometries are fit with a Hapke photometric function to solve for the single particle phase function and single scattering albedos of Phobos and also disk-resolved …
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Imaging X-ray spectroscopy with micro-X and Chandra
High spectral resolution observations of X-ray phenomena have the potential to uncover new physics. Currently, only point sources can be probed with high resolution spectra, using gratings. Extended objects like supernova remnants cannot be dispersed, leaving the dense forest of emission lines …
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External cavity laser biosensor for label-free detection
… such sensors include high sensitivity and fine resolution, which are essential for achieving high-precision detection of small molecules. In this work, we demonstrate a dual-mode external cavity laser (ECL) biosensor to address the desired needs. The utilization of photonic crystal resonant …
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Designing a beam combiner for faint limiting magnitudes in optical interferometry
… error budget, limiting magnitude estimation, spectral resolution and modelling of thermal effects on cooling the instrument to its liquid nitrogen operating temperature. The cryogenic optomechanics are described as well as a series of laboratory tests of the fringe contrast, spectral …
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Generation and characterization of spectrally factorable biphotons
Spectrally unentangled biphotons with high single-spatiotemporal-mode purity are highly desirable for many quantum information processing tasks. We generate biphotons with an inferred heralded-state spectral purity of 99%, the highest to date without any spectral filtering, by pulsed spontaneous …
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Advanced parallel magnetic resonance imaging methods with applications to MR spectroscopic imaging
… for massively parallel MRI systems named Superresolution Sensitivity Encoding (SURE-SENSE) is proposed where acceleration is performed by acquiring the low spatial resolution representation of the object being imaged and the stronger sensitivity variation from small receiver coils is used to …
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The Galaxy Velocity Function from MIGHTEE-HI Early Science Data
… employed to estimate the linewidths of the low spectral resolution data. The performance of PYMULTINEST in estimating known linewidths of simulated H I profiles with varying spectral resolution is assessed. The simulation study shows that the estimated linewidths of the Early Science data, using …
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Dynamic and geometric control of electronic spins in diamond for quantum sensing and quantum information science
… enabling single and ensemble NV AC magnetometry spectral resolution approaching sub-mHz. This protocol allows NV spins to sense an AC field spectral resolution beyond the inverse of NV spin lifetime. Also, dynamic control via dressed states of the NV spin is shown to provide effective tuning of …
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Planar Coils for NMR Microspectroscopy
… Also, susceptibility effects, which limit spectral resolution caused by the coil and the sample container, are investigated. The potential use of a low-noise preamplifier is also investigated.
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Quantitative spectral data acquisition and analysis with modular smartphone assemblies
… design is optimized for sensitivity and spectral resolution. Calibration techniques are developed to enable robust data collection across different phone models with minimal equipment. Novel algorithms for robust calibration with minimal equipment are described and implemented. The …
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Advanced Spectral Methods for Turbulent Flows
Although spectral methods have been in use for decades, there is still room for innovation, refinement and improvement of the methods in terms of efficiency and accuracy, for generalized homogeneous turbulent flows, and especially for specialized applications like the computation of atmospheric …
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Ultraviolet (UV) Laser Implementation, Signal Model, and Measurement Sensitivities in Filtered Rayleigh Scattering for Aerodynamic Flows
… levels, cesium vapor cell temperature, and spectral resolution are demonstrated. It is found that the best possible theoretical measurement results are obtained for high-speed wind tunnel flow conditions with high spectral resolution, and that the CRLB for velocity, static temperature, and …
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Solid-State Nuclear Magnetic Resonance Spectroscopy of Alpha-Synuclein Fibrils
… is uncertain, due largely to a lack of atomic-resolution structural information. Here we present structural studies of fibrils of alpha-synuclein. In this work, we first optimized an expression and purification scheme for the production of uniformly 13C and 15N labeled synuclein. We then …
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Assessing Satellite Image Data Fusion with Information Theory Metrics
… estimating an image with high spatial and high spectral resolution given separate sources of measurements from satellite instruments, one having each of these desirable properties. This thesis presents a survey of seven families of algorithms which have been developed to provide this common …
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Fiber Laser Based Nonlinear Spectroscopy
… electrically controlled wavelength-tuning and spectral resolution enhanced by a pulse shaping technique, will efficiently produce optical excitation that allows quantitative measurement of important nonlinear optical properties of materials. The work represented here encompasses the theory and …
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Nanosatellite Hyperspectral Imaging Performance Modeling for Ocean Color Detection.
… space-based monitoring requires increased spectral, temporal, and spatial resolution compared with currently available performance from legacy instruments such as MODIS, MERIS, and SeaWiFS. Data coverage without temporal gaps is necessary for monitoring short- and long-term trends, and high …
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The benefits of acoustic input to combined electric and contralateral acoustic hearing
… in performance was likely due to the improved spectral representation of the first formant. The aims of Experiments 2 and 3 were to investigate the underlying psychophysical mechanisms of the contribution of the acoustic input to electric hearing. Temporal Modulation Transfer Functions (TMTFs) …
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Methods for Increasing Sensitivity and Throughput of Solid-State NMR Spectroscopy of Pharmaceutical Solids
… amorphous form stability, cost, and 19F SSNMR spectral resolution between the crystalline and amorphous solid forms. Triamcinolone was selected for quantitation studies using 19F SSNMR.
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Extreme Ultraviolet Polarimetry with Laser-Generated High-Order Harmonics
… with an accuracy of 0.3 mm, which allows a spectral resolution of about 180. We have demonstrated that reflectance as low as 0.2% can be measured at EUV wavelengths and that this data is repeatable to within the error of our source stability (~7% fluctuation). We have compared reflectance …
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