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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 924 for “"desorption"”.
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Thermal desorption of neutral molecules
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Improvements in Field Desorption Mass Spectrometry
Made available in DSpace on 2014-12-13T20:10:26Z (GMT). No. of bitstreams: 1 7821218.pdf: 5048747 bytes, checksum: 06c638c02401b7ddef3eb9782b168f7b (MD5) Previous issue date: 1978
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Design of a Temperature Programmed Desorption System for the Measurement of the Desorption Kinetics of Molecules from Surfaces
Temperature programmed desorption (TPD) is an experimental technique used to measure the desorption kinetics of molecules from surfaces. This technique is performed by linearly increasing the temperature of a sample while measuring the partial pressures of the desorbing gas species. It is used to …
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On-line laser desorption/ionization mass spectrometry
Interfaces for on-line laser desorption/ionization mass spectrometry are presented in this dissertation. An on line laser desorption interface allows samples to be introduced directly into the mass spectrometer for high-throughput applications. For this research, a linear time of flight mass …
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Stochastic Theory of Desorption Reactions (Brownian Motion)
A Brownian motion model is used to study the escape of a molecule from a physisorbed state into a dense fluid.
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Desorption of Trace Contaminants From Activated Carbon: Effect of Strongly-Competing and Pore-Blocking Background Organic Matter on Desorption Kinetics
… background organic matter on both adsorption and desorption kinetics in a batch reactor. The model was applied to describe and compare kinetics using two PACs with different pore size distributions. An analysis of important issues in modeling desorption led to several recommendations for future …
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Sorption and desorption of selenium in cement formulations
… 5% clay appears to decrease sorption. A sorption/desorption study was conducted on cementitious formulations containing three levels of w/s ratios (45%, 50%, 55%) and three weight percentages of clay (0%, 3%, 5%) at several concentrations of selenium (6.5 ppb, 26 ppb, 53 ppb, 126 ppb, 784 ppb, …
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Hydrogen desorption and absorption for activated magnesium hydride
… to determine the resultant effects on hydrogen desorption and absorption kinetics for potential use as a hydrogen storage material. It is found that the addition of LiBH4 in small molar ratios results in improved kinetics of the same order as those observed for mechanically milled magnesium. The …
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Desorption and Surface Diffusion: Nitrogen on Tungsten (110)
Made available in DSpace on 2014-12-14T16:00:35Z (GMT). No. of bitstreams: 1 7804116.pdf: 4792915 bytes, checksum: ba5e3c05ed584b197539c4094b36dc5a (MD5) Previous issue date: 1977
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Dynamics of Adsorption and Desorption on Chiral Surfaces
… molecular dynamics simulations of the subsequent desorption. Special focus in the analysis of these reactive trajectories lies on the time evolution of rotational momenta. To that end, molecules with different degrees of rotational symmetry were chosen as model systems. Methane (spherical top), …
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Pressure Swing Assisted Desorption for Atmospheric Water Collection
… of atmospheric water harvesting focus on thermal desorption, where heat is applied to release the water vapor from the sorbent. Another method worth exploring is utilizing pressure swings to release this water vapor, and seeing how a combined method of thermal and depressurized desorption would …
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Copper adsorption/desorption characteristics on copper amended soils
Laboratory tests were conducted to determine Cu availability of three Virginia soils amended with Cu as either Cu-rich pig manure or CuSO₄ with the same Cu content as that in manure. The study also assessed the capability of Mehlich-3 to estimate deficient and toxic Cu levels in soil. Application …
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Angle-Resolved Thermal Desorption Spectroscopy as a Surface Probe
… fifteen years it has become apparent that the desorption process is not as well understood as it appeared when Knudsen formulated his cosine law of desorption in the early 1900's. Directed desorption, where the flux is focused along the surface normal, has been observed in several systems, …
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Scanning desorption of small molecules from model biological surfaces.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1977
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Transport and adsorption-desorption of heavy metals in different soils
… were performed to assess the sorption-desorption and mobility of Cd, Cu, Pb, and Sn in alkaline and acidic soils. Furthermore, sequential extractions were accomplished to examine their behavior in soils. Also, the competitive reactivity of Sn and Pb in two acidic soils was quantified. …
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Electron Impact Desorption of Ions and Neutrals From Polycrystalline Tungsten
Made available in DSpace on 2014-12-08T22:24:38Z (GMT). No. of bitstreams: 1 7000940.pdf: 5535805 bytes, checksum: d07206d654d974331ad0b4bc0f29390b (MD5) Previous issue date: 1969
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Preparation and characterization of functionalized surfaces for desorption-ionization mass spectrometry
Structural proteomics combined with mass spectrometry, is a rapidly evolving scientific discipline that focuses on the characterization of the three-dimensional structures of proteins, as well as their dynamics. However, Current standard practices require a large number of separate processing …
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Fundamental aspects of imaging matrix assisted laser desorption ionisation mass spectrometry.
Matrix assisted laser desorption/ionisation mass spectrometry imaging is a recent addition to the existing family of molecular imaging technologies. It has the capacity to map the distribution of molecules within a biological tissue section, without the need for radionuclide or fluorescent …
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Rapid Transient Cooling Utilizing Flash Boiling and Desorption on Graphitic Foams
Transient thermal systems present significant challenges. Neglecting the time constants
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