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 1095 for “"Chemistry, Physical."”.
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In-Situ Remediation of Small Leaks in Water Pipes: Impacts of Water Chemistry, Physical Parameters and the Presence of Particles
… at relatively low cost and inconvenience. Physical clogging, precipitation and metallic corrosion were identified as major mechanisms of in-situ leak remediation in potable water pipelines. Autogenous repair (i.e., self-repair without added particles) of small leak-holes (150–"1000 μm) in …
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An Ecological Assessment of Restoration Efforts Developed to Recover an Intensively Mined Appalachian Watershed
… (AMD) impaired streams. We sampled water chemistry, physical habitat, and benthic macroinvertebrate and fish community structure in 3 stream types: AMD (14 streams), AMD-treated (13 streams), and unimpaired reference (4 streams). Treatment technology implemented on impaired streams …
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ELECTRONIC SPECTRA OF SELECTED 5-D-ELECTRON TRANSITION METAL COMPLEXES.
ELECTRONIC SPECTRA OF SELECTED 5-D-ELECTRON TRANSITION METAL COMPLEXES.
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Aqueous photoionization of anionic 2'-deoxythmidine-5'-phosphate, 2'-deoxyguanosine and tryptophan.
Aqueous photoionization of anionic 2'-deoxythmidine-5'-phosphate, 2'-deoxyguanosine and tryptophan.
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Infrared and circular dichroism studies of carbon-13 isotopically labeled peptide models.
Infrared and circular dichroism studies of carbon-13 isotopically labeled peptide models.
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Theoretical study of the reactions of oxygen(P-3) + molecular hydrogen and oxygen(P-3) + hydrogen deuteride.
Theoretical study of the reactions of oxygen(P-3) + molecular hydrogen and oxygen(P-3) + hydrogen deuteride.
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Investigation of Closed-Loop Control of Polyatomic Molecules
ABSTRACT Investigation of Closed-Loop Control of Polyatomic Molecules Lalinda N. Palliyaguru Doctor of Philosophy Temple University, 2009 Doctoral Advisory Committee Chair: Prof. Robert J. Levis Experimental results that are based on mass spectral data, in this thesis includes …
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Ions and neutrals in the gas phase: Structure, stability and fragmentation mechanisms.
Overview. With the advent of two new techniques, collisionally induced dissociative ionization and neutralization reionization mass spectrometry, it is possible to investigate the structure and stability of neutrals as well as ions. Fragmentation mechanisms of alkyl phenyl ethers. The metastable …
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Photochemistry of ethylene with infrared and ultraviolet radiation
Abstract not available.
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Theoretical Simulations of Optical Rotation and Raman Optical Activity of Molecules in Solution
… analysis of molecules (or molecular stereochemistry) requires the accurate and efficient computation of chiroptical response properties. Access to a battery of accurate methods, especially for OR, have just emerged over the last decade. A combination of quantum chemical electronic structure …
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The Volumetric Properties for Selected Impurities in Dense CO2 Destined for Re-Injection
… stream. These impurities can impact the thermophysical properties and chemical equilibria within the fluid stream. In this work, the volumetric influence of H2S, COS, CS2, SO2, and O2 impurities in a dense CO2 phase were studied through high-precision density measurements. The densities were …
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Rotational spectra and molecular structures of organometallic and organic molecules
Understanding the nature of chemical bonds constitutes a major theme of this thesis. This thesis investigates the gas phase rotational spectra, electronic charge distributions and molecular structures of organometallic and organic molecules, using high-resolution pulsed beam Fourier transform …
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Elucidating the Hydration of Biomolecules: An Experimental and Computational Approach
However, by carefully accounting for differences between gas-phase and solution-phase systems, a better understanding of how competitive noncovalent interactions affect the hydration and structure of flexible biomolecules can be gleaned. By systematically probing inherent gas-phase properties, such …
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In Search of Catalytic Proficiency: The Importance of Enzyme Conformational Change to Orotidine 5'-Monophosphate Decarboxylase Catalysis
By applying the tools of enzymology learned in the Gerlt Laboratory and working successfully with numerous collaborators, I have furthered our understanding of the mechanism of one of Nature's best catalysts, OMPDC. Increasingly in enzymology, the role of conformational change in enzyme catalysis …
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Ignition and Combustion of Boron Particles in Hydrogen/oxygen Combustion Products at 30 to 150 Atmospheres
The results of this study demonstrate that boron particle lifetimes at elevated pressures are sufficiently short to make these particles suitable for additives to propellants and that smaller 1-10 $\mu$m sized particles, which have still shorter lifetimes, may be appropriate for addition to …
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Solid-State Nuclear Magnetic Resonance Spectroscopy of Alpha-Synuclein Fibrils
Recent solid-state NMR (SSNMR) studies on protein systems such as beta-amyloid and the prion HET-s demonstrate the applicability of these techniques towards solving 3D structures of amyloid fibrils. Alpha-synuclein is a 140-residue protein that has been implicated in Parkinson's disease. Fibrils of …
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Synthesis and Applications of Novel Responsive Materials
This thesis describes the synthesis of responsive organic polymers which show potential for use in a variety of applications. A series of pyridine terminated m-phenylene ethynylene oligomers were synthesized. When trans-dichlorobis(acetonitrile)palladium was added to a solution of these oligomers, …
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Optically-Assisted Scanning Tunneling Microscopy
Scanning tunneling microscopy (STM) consistently provides the highest spatial resolution among the scanning probe methods, allowing surfaces to be investigated on the atomic level. With the addition of optical excitation, STM promises to become a powerful technique for single molecule spectroscopy, …
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Quantum Mechanical Calculations of Time Correlation Functions for Neat Fluids
A more direct calculation using the pair-product approximation to the propagator is also discussed. Using single-step approximations to the propagator, it is shown that real-time correlation functions can be expressed as integrals of smooth functions, and thus can be efficiently evaluated by Monte …
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Nuclear Spin Dependence in Reactions of Hydrogen (3+) Ion in the Laboratory and the Interstellar Medium
… the use of the H+3 spin modifications as astrophysical probes, for understanding the deuterium chemistry of the interstellar medium, and for the fundamental chemical physics of these very simple molecules.
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