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 23 for “"positive ions"”.
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Variational Monte Carlo study of core-valence separation schemes for first-row atoms and positive ions /
All-electron partitioning of wave functions into products ^core^vai of core and valence parts in orbital space results in the loss of core-valence antisymmetry, uncorrelation of motion of core and valence electrons, and core-valence overlap. These effects are studied with the variational Monte …
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Plasma-water interface reactions caused by positive corona and glow discharges
… and O3 in water. Plasma-water interface reactions are one of the core challenges in this field since it involves multiple physical and chemical processes leading to complex mechanism of mass/energy transfer and reactive species production at interface. Exploration of the plasma-water interface …
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Numerical and Experimental Study of the Trichel Pulses in Needle-plane Geometry
… energized electrons, formation of the cloud of positive ions close to the cathode, and formation of the cloud of negative ions at a farther distance from the corona electrode compared to their positive counterparts. In this thesis, the results of a detailed numerical investigation of the …
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Mass spectrometry of substituted benzils
The positive and negative ion mess spectra and appearance potentials were determined for the following compounds: benzil, 4-methylbenzil, 4- methoxybenzil, 4-methylmercaptobenzil, 4-dimethylaminobenzil, 4-chlorobenzil, 4—nitrobenzil, 4,4'-dimethylbenzil, 4,4'-dimethoxybenzil, 4,4'- …
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Negative ion charge transfer of the reaction of S⁻ and O⁻ with atomic hydrogen producing H⁻ ions from 1500 to 10 kev
<p>"The charge transfer reactions of 0<sup>-</sup>, S<sup>-</sup> with atomic hydrogen were studied from 1.5 to 10 KeV, and the reaction Cl<sup>-</sup> + O<sub>2</sub> + O<sub>2</sub><sup>-</sup> + Cl was studied from 10 eV to 10 KeV. The reactions studied were normalized to the reaction …
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Ionisation in Flames with Additives
… flames results in the formation of negative ions accompanied by a decrease in free electron concentrations. Observations were made of the effects of phosphorus on the ionisation of sodium, potassium, rubidium and caesium. The ionisation of lithium is reduced by extensive hydroxide formation, …
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The Study of Positive-Ion Mass Spectrometry of 5-Fluorouracil Using Low-Energy Electron Impact
… 0.5 ms providing good time-of-flight resolution. Positive ions produced by electron collisions with the molecules are extracted into a reflectron time-of-flight mass spectrometer. The field-free region and the reflector of the time-of-flight mass spectrometer are both located in the flight-tube. …
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The Physiological Aspects of the Piezoelectric Phenomenon and its Application in Biologic Bone
<p>The relationship between stress and bony architecture has long been recognized, but the actual cellular machanism which causes the alteration is still somewhat vague. Piezoelectric properties and bioelectric potentials have been proposed as partial answers.</p> <p>It is the purpose of this …
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Improved wave functions for quantum Monte Carlo
… for correlated quantum systems. QMC calculations based on many-body wave functions are considerably more accurate than density functional theory methods, and their accuracy rivals that of the most sophisticated quantum chemistry methods. This thesis is concerned with the development of …
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Fragmentation of Charged Binary Clusters
… clusters composed of H2O/CH3OH and charged with ions (Na+, K+, Cs+,F^, Cl-, I-) of similar sign are studied by molecular simulation. The fragmentation involves the departure of a cluster containing one or more ions from the parent droplet by a break-down of the non-covalent interactions of the …
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Dielectrophoresis study of electroporation effects on dielectric properties of biological cells
… of large and relatively immobile negative ions inside the cell which attract mobile positive ions (mainly sodium and potassium) to maintain cell electrical neutrality. We monitor the temporal response of cells after electroporation to measure the time constant of changes due to ion …
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Characterization of Cucurbituril Complex Ions in the Gas Phase Using Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
<p>Host-guest interactions have been well studied in the new century to obtain fundamental insights into supramolecular chemistry. Most of the pioneering works have been done using techniques such as NMR, X-ray crystallography, IR spectroscopy and so on. However, none of these techniques is …
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Design, synthesis and SAR of small molecules acting on pain pathways
… FAAH at micromolar to nanomolar concentrations. 2. The second class of compounds were designed to interact with prokineticin system. Numerous studies highlighted the involvement of this system in different physiological processes including nociception. Activation of these receptors on the …
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Pulsatile Electropolishing of Nitinol Stents
… that dissolves the metal species produces positive ions, these oxidize and form stable surface layers of metallic oxides that prevent further dissolution. This is usually overcome with the use of acid solutions that dissolve the metallic oxide. This thesis aims to shift the primary control …
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Understanding Primate Immunity to African Trypanosomes Through the Characterization of Trypanosome Lytic Factor Formation and Function
… in the liver, where APOL1, and under some conditions HPR, are assembled in/on the hepatocyte with sufficient lipid to generate a nascent, or pre-beta HDL (TLF3). This TLF3 enters circulation and accumulates lipid, cholesterol and phospholipids, from peripheral tissue to mature into TLF1. TLF1 can …
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Numerical modelling of low temperature plasma
… astrophysical contexts. Three different situations are investigated: an instability in electronegative plasmas; electron avalanches during plasma initiation; and a phenomenon called the Critical Ionisation Velocity interaction. Industrial plasma discharges with electronegative gases are found …
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Plasma Dynamics in a High-Power Helicon Source
… over 100 million kelvin to sustain fusion reactions. Neutral Beam Injectors (NBIs) will provide most of the heating power by accelerating negative ions to energies of 1 MeV, where they are then neutralised to penetrate the magnetic confinement fields. Negative ions, as opposed to positive ions, …
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Plasma Dynamics in a High-Power Helicon Source
… over 100 million kelvin to sustain fusion reactions. Neutral Beam Injectors (NBIs) will provide most of the heating power by accelerating negative ions to energies of 1 MeV, where they are then neutralised to penetrate the magnetic confinement fields. Negative ions, as opposed to positive ions, …
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Modeling and Experimental Measurement of Triboelectric Charging in Dielectric Granular Mixtures
… a stochastic process resulting from random collisions between grains, but creates clear charge segregation according to size in dielectric granular mixtures. Experiments in grain charging are frequently conducted with methods that may introduce additional charging mechanisms that would not be …
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