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 249 for “"mass spectroscopy"”.
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Mass spectroscopy using single ion cyclotron resonance
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1990.
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Penning trap mass spectroscopy at 0.1 ppb
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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Improved single ion cyclotron resonance mass spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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Mass-spectroscopy and modeling of capacitive coupled hydrogen plasmas
… electrode are measured with an energy-resolved mass spectrometer. Spatial proles of the electron density are measured using a hairpin probe. Particle-in-cell simulations including a complex hydrogen chemistry are performed which enable direct comparison to the experiment. In the steady-state …
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Analysis of wood pulp extracts utilizing gas chromatography-mass spectroscopy
Wood pulp mill effluents continue to attract much attention due to environmental consequences. However, in comparison, very little work has been published on wood pulp extracts themselves. In this investigation, chemithermomechanical (CTMP) pulps as well as Kraft (BKP) pulps were Soxhlet extracted …
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Mass spectroscopy of neutral mesons in the photon hemisphere at HERA
Die inklusive Photoproduktion neutraler Mesonen mit dem Detektor H1 bei HERA ist das Thema dieser Arbeit. Der inklusive Wirkungsquerschnitt fuer die pi0- und eta-Produktion ist als Funktion der Transversalimpulse und der Rapiditaeten der Mesonen bei einer mittleren Schwerpunktsenergie des …
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Comparison of Artificial Flavors in Commercial Products and Actual Natural Flavor via Gas Chromatography Mass Spectroscopy Data.
… sources were profiled by gas chromatography-mass spectroscopy (GCMS). These profiles were then used as a reference to compare GCMS profiles of commercial artificial strawberry flavor products such as strawberry flavored Cool Splashers™, Gatorade®, and Aquacal® flavored water. The …
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New insights in impact ionization and in time-of-flight mass spectroscopy with micrometeoroid detectors by improved impact simulations in the laboratory
… detectors CDA and CIDA. The projectile masses cover a range of 10^-18 to 10^-12 kg, the projectile densities a range of 1100 - 7900 kg/m^3 and the impact speeds a range of 2 - 70 km/s. The resulting data show different impact ionization processes depending on the impact speeds: for low …
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Analysis of Kyrock for Leaching of Impurities in Synthetic Rainwater
… of the samples using inductively coupled plasma spectroscopy showed inorganic compounds such as titanium oxide, vanadium oxide along with traces of arsenic. Elemental analysis of samples indicates a percent of carbon, and sulfur with no notable traces of nitrogen. Pyrolysis of the samples was …
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Aspects of group 14 element - transition metal cluster chemistry
… [CCo₈(CO)₁₈]²⁻ (characterised by infrared spectroscopy and FABS mass spectroscopy) and [Cl₂SiCo₇(CO)₂₁]⁻ (characterised by X-ray crystallography as the [Et₄N]⁺ salt). A [CCo₁₀(CO)₂₄]ⁿ⁻ species has also been detected by FABS mass spectroscopy. (CO)₄CoGeCo₃(CO)₉ with [Mn(CO)₅]⁻ provided …
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Stable isotope probing of hyperthermophilic filamentous microbial communities in Octopus Spring, Yellowstone National Park
… Octopus Spring in Yellowstone National Park. Biomass was removed from the outflow stream and incubated at near-in situ conditions with labeled bicarbonate, formate, or acetate. Lipids from the biomass were extracted and analyzed using gas chromatography-mass spectroscopy (GC-MS) and gas …
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Purification of Cd, Zn and Te for CdZnTe growth
… of Cd and Zn were developed. Glow discharge mass spectroscopy (GDMS) analysis was used to measure impurity concentrations of 74 elements. Cd purification using vacuum distillation proved to be an effective method to reduce the impurity level of 5N starting material to a purity between the …
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Direct Multielemental Analysis of Solid Samples Using Laser Ablation Inductively Coupled Plasma Mass Spectometry and Pulsed Radio Frequency Glow Discharge Mass Spectrometry
… are laser ablation inductively coupled plasma mass spectroscopy (LA-ICPMS) and radio frequency glow discharge mass spectroscopy (rf-GDMS). A Cetac LSX-200 laser system coupled to a LECO Renaissance ICPMS was utilized to analyze coal and ash samples prepared by incorporation into a lithium …
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Cyclodextrin Assisted Enantiomeric Recognition of Amino Acid Imides and Toward Synthesis of Dolabellane Diterpenoid B
… amino acids were studied using 1D and 2D NMR spectroscopy, EleacroSpray Ionization Mass Spectroscopy (ESIMS), Matrix- Assisted Laser Desorption Ionization Time-of-Flight Mass Spectroscopy (MALDI-TOF-MS). The role of p-p stacking interaction between aromatic moieties in enantiomeric resolution …
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Photochemistry of Polycyclic Aromatic Hydrocarbons with Environmentally Relevant Metals
… for soluble iron by inductively-coupled plasma mass spectroscopy (ICP-MS) following a 16 hour reaction period using simulated sunlight. Significant increases in soluble iron were only seen with 2-3 ring linear PAH and carboxylic acids.</p> <p>A two-stage study was conducted to investigate the …
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In situ sintering study of model nickel catalysts
… analytical techniques such as gas chromatography mass spectroscopy (GCMS) and liquid chromatography mass spectroscopy (LC-MS) has become popular as metabolomics tools in the study of such catabolic pathways. The development of biomarkers and internal standards to perform quantitative and …
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Synthesis and evaluation of flouro and thia lipids as bioanalytical tools
… analytical techniques such as gas chromatography mass spectroscopy (GCMS) and liquid chromatography mass spectroscopy (LC-MS) has become popular as metabolomics tools in the study of such catabolic pathways. The development of biomarkers and internal standards to perform quantitative and …
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Formation of secondary organic aerosol and its processing by atmospheric halogen species – A spectroscopic study
… of those organic aerosols. Infrared and UV/VIS spectroscopy allowed the determination of functional and structural changes during aerosol formation and processing. Using electron microscopy and measurement of the particle size distribution, the formation of the morphology and geometry of the …
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