This thesis describes a method of determining the recombination rate coefficient experimentally, which does not depend on a specific model of the recombination process. With this method established, results are presented for the recombination rate coefficient measurements at 44.6 Torr.

published_or_final_version / abstract / toc / Physics / Master / Master of Philosophy

Thesis (M. Phil.)--University of Hong Kong, 2005. / Title proper from title frame. Also available in printed format.

Thesis (M.S.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains v, 36 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 21).

Electron-ion recombination has been under study for many years, but comparisons between theory and experiment have been very difficult, especially for conditions where the ion under evaluation was a minority in concentration. This study describes a direct measurement of the recombination-rate coefficient for the recombination of minority as well as majority ions in the afterglow.

This project is dealing with the human body and surgical modifications. I am wondering how to achieve the aim of provoking compassion, rejection and attraction in one collection. I would like to deeply move the sensation of your own body by showing deformed and reconstructed bodies.Cut off body parts and re-sew them somewhere else…I want to show something that is considered to be disgusting in a context where you would not expect to meet it.Furthermore, I would like to show that anything that looks normal disgusts you in an abnormal size or position.I want people to discover such elements at a second glance and I chose this theme also in order to provoke myself. I was wondering how it would affect my work by chosing a topic that irritates myself.The background for this project is built on a two year research and I am going to highlight the decisions along the way.I do relate my work strongly to Matthew Barneys way of creating and I got influenced by his aesthetics. But also the methods I used were significant for my end result which I am showing in form of clinical reports in which each character and its personal story is described.This report ends with a discussion part where I evaluate the result and my competence. / Program: Master Programme in Fashion Design

A gas phase kinetic model for the CF���/O��� microwave discharge plasma and afterglow of our laboratory has been developed. A reaction pathway identifying the major chemical reactions is proposed. The rate coefficients of the electron impact dissociation reactions are determined at three different plasma powers using both published electron molecule collision cross section data and plug flow analysis of data collected in our system. Agreement between calculated and experimental rate coefficients is better than 20%. Fluid simulations of a two-dimensional mathematical model were performed using computational fluid dynamics. It is found that the model reproduced qualitatively the general trends of the experimental data. The effects of plasma power, feed gas composition, residence time and pressure on the product distribution of the system are studied. CF��� conversion increases with power and residence time. The variation of CF��� conversion and carbon containing species distribution falls into two regimes. In the oxygen rich regime (below 25 mole % CF��� in the feed), CO��� is found to be the major product of CF��� decomposition; homogeneous recombination reactions between atomic oxygen and the free radicals are found to be the dominant mechanism in the afterglow region resulting in high CF��� conversions. Homogeneous reactions convert CO to CO���. In the CF��� rich regime (above 50 mole % CF���), COF��� is found to be the major product of CF��� decomposition. Recombination reactions of CF��� with atomic fluorine dominate in the afterglow region and limit conversion. Lowering pressures result in increased conversion of CF��� and increased concentration of the carbon containing species. / Graduation date: 1998

Thesis (Ph.D.)--University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 28, 2007) Vita. Includes bibliographical references.

The study of plasmas generated in pure nitrogen and their afterglows are a subject of many hundreds works bringing a lot of information about the kinetic processes and energy transfer reactions. The effect of nitrogen pink afterglow has a specific position among the other kinds of discharges and post-discharges. The post-discharge, and especially the pink afterglow, is extremely sensitive to the presence of various impurities and experimental conditions (total gas pressure in a discharge tube, temperature, etc.) because of their significant influence on all kinetic processes. That is the reason, why it is so important to study this processes. The DC flowing afterglow (generated using the hollow molybdenum electrodes in the distance of 12 cm, power ± 290 W) was used for the experimental part of this work. The discharge was created in Pyrex discharge tube at different concentration ratio of nitrogen and argon. The total gas presure was in range from 500 Pa to 5000 Pa. The emission spectra of post-discharge were recorded by TRIAX 550 spectrometer with CCD detector in the range of 320-780 nm. The vibrational populations at individual vibrational levels were calculated using the emission bands of the first (N2 (B 3g) N2 (A 3u+)) and the second (N2 (C 3u) N2 (B 3g)) positive and the first negative (N2+ (B 2u+) N2+ (X 2g+) nitrogen spectral systems. The dependencies of intensity on decay time and relative vibrational populations on argon concentration and pressure were obtained. The pink afterglow was very sharp in pure nitrogen at low pressure. With the increasing total pressure it was shifted to the later decay times and it was visible for longer time, too. The same effect was observed with the increase of argon concentration in the gas mixture. At the highest argon concentrations, especially at lower pressure, the effect of pink afterglow dissapeared. The knowledge of these processes can give the solution of all kinetic reactions in plasma and this can be used in plasma chemistry and for development of new technologies. This will be a subject of further intensive studies.

Background: Psilocybin is today the most studied psychedelic substance in neuroscience for its psychotomimetic and therapeutic effects. One of the institutions in the Czech Republic that studies this substance is the National Institute of Mental Health, where a clinical evaluation of its effects and safety is underway. The action and safety of this substance is examined here in terms of acute intoxication, but also in terms of long-term effects. Aim: To determine how volunteers perceive the experience with psilocybin administered in a controlled experimental study environment and whether they have experienced any afterglow effects after the cessation of acute intoxication for 28 days after administration, as well as how these effects occur and how long they persist. Methods: Data was obtained using semi-structured interviews. The research group consists of 20 interviews with 10 healthy volunteers of the clinical study at NUDZ. Interviews were conducted on day 28 after administration of an active dose of psilocybin or placebo. A qualitative thematic analysis of these interviews was performed in order to identify topics within the framework set by the research questions. Results: The results showed that for the respondents, the experience with the active dose of psilocybin was significant in terms of...