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 96 for “"Spectroscopic measurements"”.
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Spectroscopic measurements of atmospheric trace gases at Neumayer-Station, Antarctica
… research station Neumayer (70°S, 8°W). The measurements of the atmospheric trace gases ozone, NO2, OClO, BrO, IO and O4 were performed using a new UV/Vis spectrograph, developed within the scope of this work. The main intention of DOAS measurements in the Antarctic coastal region was to …
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Spectroscopic Measurements of Doping and Strain at Two-Dimensional Material Interfaces
Measurements of charge doping and mechanical strain in graphene have shown a strong dependence on the graphene source, transfer method, and substrate choice. Here I report Raman spectroscopy measurements of chemical vapor deposition (CVD) grown graphene transferred to a number of relevant …
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Determining gas temperature from spectroscopic measurements in electric oxygen-iodine lasers
… being relied upon for gas temperature measurements. In the past, all temperature information was calculated using the O2(b1Σ) emission spectrum. This thesis discusses a new temperature diagnostic so that gas temperatures can be obtained from the O2(a1Δ) emission spectrum. Determining …
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Quantification of molecular aggregation equilibria using spectroscopic measurements and random mixing modeling
<p>Molecular aggregation equilibria, such as the binding of ligands to a central solute molecule, are prevalent throughout biological processes and energy storage devices. However, both the sign and magnitude of hydrophobic and ionic interactions remains a subject of theoretical debate, and has yet …
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High temperature spectroscopic measurements of aluminum combustion in a heterogeneous shock tube
… nano-aluminum ignition and combustion. Optical measurements of the peak combustion temperature from AlO consistently measure near 3200 K in micro-Al combustion, even though higher temperatures are seen near larger particles. One proposed limiting factor was the volatilization temperature of …
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Spectroscopic measurements and modeling of carbonaceous particle combustion in a shock tube
… efficiencies feed into broadband emission measurements for inferring particle temperature. Complementary gas-phase absorption of diatomic carbon (2) is implemented by targeting the Swan bands with broadband direct absorption, enabling temperature and number-density retrievals during CNP …
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Spectroscopic Measurements of Magnetic Field and Electron Density on Wire Array and Laser Plasmas
… of high energy density laboratory plasmas. These measurements are challenging because often the magnetic fields undergo significant spatial and temporal fluctuations. Of the few measurement techniques possible, Zeeman splitting is the most promising option. However, this method has limitations …
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Spectroscopic Measurements of the Combustion of Aluminum and Aluminum-Based Energetic Material Particles Using a Heterogeneous Shock Tube
… and emission and absorption spectroscopy. These measurements have led to the determination that aluminum particles below 10 mum do not burn with the gas-phase diffusion flame observed in larger (>20 mum) sizes, but rather with reactions occurring very close to the particle surface. These …
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Ultra-high Field MRI Methods for Precise Anatomical and Spectroscopic Measurements in the Brain and Application to Neurological and Neuropsychiatric Diseases
… of this work was to investigate anatomical and spectroscopic biomarkers in the brain. Specifically, we analyzed limbic structure subfield volumes, including subfields of the hippocampus, amygdala, and thalamus, for diseases including major depressive disorder (MDD) and trigeminal neuralgia (TN). …
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Three-dimensional nanofabrication with elastomeric phase mask
… geometries consistent with calculation. Spectroscopic measurements of transmission and reflection through the silicon and polymer structures reveal excellent optical properties, approaching properties predicted by simulations that assume ideal structures. Besides maskless PnP, multiple …
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Spectroscopic measurement of nitric oxide in a diffusion flame
Conventional measurements of NO and NO₂ produced by a diffusion flame around a cotton ball wetted by heptane have been performed and prove that NO is oxidized to NO₂ on a mole for mole basis when the air of the flame is doped with hydrogen and that the NO to NO₂ mechanism does not require carbon …
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Cyclostationary statistical optics
… examined in the context of interferometric and spectroscopic measurements. Propagation of fields from more general sources is considered in relation to the spectral or polarimetric properties observed. A new scheme for measuring cyclostationary effects is proposed.
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MRI temperature mapping and finite element modeling of heat transfer in carrot particulates undergoing thermal processing
… This method was superior to inversion recovery spectroscopic measurements when the T$\sb1$ temperature dependence is not linear.
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Structural and spectroscopic studies with dithizone and its derivatives
… been considered in the light of i.r. and n.m.r. spectroscopic measurements. The temporal changes in the visible absorption spectrum of S-methyldithizone, PhN:N•C(SCH3):N•NHPh, have been shown to arise from syn-anti isomerization about the fonnal C=N double bond and rotation about the C-N single …
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Investigation of the Light Emitters in the Aluminum - Water Reaction
… wire technique was used in connection with spectroscopic measurements and high speed photography to investigate the nature of the radiant emission from the Al - H2O combustion process. Small aluminum wires were successfully ignited under water at various pressures, but a complete, self …
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Ultrafast photoinduced dynamics of low-dimensional excitonic materials at room temperature
… two low-dimensional materials. With ultrafast spectroscopic measurements, we probe these materials at room temperature and in non-idealised regimes, building on where these frameworks fall short. We first investigate monolayer MoS₂ and WS₂, which exhibit strong light-matter interaction with …
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The application of quantum cascade lasers to mid-infrared gas sensing
… techniques were then applied to high temperature spectroscopic measurements. Spectra recorded at Rutherford Appleton Laboratory were used to calibrate high temperature measurements. The performance of the technology was thoroughly tested at the National Physical Laboratory. The resulting sensors …
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Rotationally resolved visible spectroscopy of the Asteroid 1 Ceres
This thesis was designed to make spectroscopic measurements of Ceres within the visible spectrum, specifically within the wavelength range of 6000 and 7000 Angstroms. The asteroid was observed for 6 nights, for lengths of time varying from 3 to 7.5 hours. The main goal was to support/refute the …
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Planar Tunneling and Andreev Bound State Spectroscopy of YBa2Cu3O7- d Thin Films Using Solution-Deposited Zirconia Insulators
Planar tunnel spectroscopic measurements are performed on YBa2Cu3O7-δ (YBCO) thin films at four different crystallographic orientations. Since tunneling is a highly surface-sensitive probe on YBCO, films have been optimized for high surface quality. To fabricate the tunneling insulator, a novel …
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