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We constrain the recent star formation histories of the host galaxies of eight optical/UV-detected tidal disruption events (TDEs). Six hosts had quick starbursts of <200 Myr duration that ended 10-1000 Myr ago, indicating that TDEs arise at different times in their hosts' post-starburst evolution. If the disrupted star formed in the burst or before, the post-burst age constrains its mass, generally excluding O, most B, and highly massive A stars. If the starburst arose from a galaxy merger, the time since the starburst began limits the coalescence timescale and thus the merger mass ratio to more equal than 12: 1 in most hosts. This uncommon ratio, if also that of the central supermassive black hole (SMBH) binary, disfavors the scenario in which the TDE rate is boosted by the binary but is insensitive to its mass ratio. The stellar mass fraction created in the burst is 0.5%-10% for most hosts, not enough to explain the observed 30-200x. boost in TDE rates, suggesting that the host's core stellar concentration is more important. TDE hosts have stellar masses 10(9.4)-10(10.3) M circle dot,consistent with the Sloan Digital Sky Survey volume-corrected, quiescent Balmer-strong comparison sample and implying SMBH masses of 10(5.5)-10(7.5) M circle dot, Subtracting the host absorption line spectrum, we uncover emission lines; at least five hosts have ionization sources inconsistent with star formation that instead may be related to circumnuclear gas, merger shocks, or post-AGB stars.

M.Sc. / Several characteristics of the homothallic species, Chaetomium aureum, c erraticum, c flavigenum, c rubrogenum and c trilaterale, were examined and compared. Morphological details such as perithecial structure, form and ornamentation of the setae and spores, physiological aspects such as formation of pigment and cellulolytic activity as well as nuclear behaviour during ascosporogenesis were examined to determine their species differentiating potential. Although pigment formation and ornamentation of setae are environment dependent these features could be useful in species delimitation ...

by Chan Yuk-ping. / Parallel title in Chinese characters. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1990. / Bibliography: leaves 103-105. / List of Figures --- p.iii / Acknowledgement --- p.vii / Abstract --- p.viii / Chapter 1. --- Introduction --- p.1 / Chapter 2. --- Overview --- p.4 / Chapter 2.1 --- Hadron-hadron Scattering --- p.4 / Chapter 2.1.1 --- Introduction --- p.4 / Chapter 2.1.2 --- Geometrical Picture --- p.5 / Chapter 2.1.3 --- Inelastic Scattering --- p.11 / Chapter A. --- Charged Multiplicity Distribution in Full Phase Space --- p.11 / Chapter B. --- Multiplicity Distribution in Limited Rapidity Windows --- p.22 / Chapter C. --- Correlation --- p.22 / Chapter D. --- The Partition Temperature Model --- p.27 / Chapter 2.2 --- Hadron-Nucleus Scattering --- p.29 / Chapter 3. --- Charged Particle Multiplicity Distribution in Limited Rapidity Windows in Hadron-Nucleus Scattering --- p.37 / Chapter 3.1 --- Introduction --- p.37 / Chapter 3.2 --- Formalism --- p.40 / Chapter 3.2.1 --- Fluctuation Around n(b) --- p.43 / Chapter 3.2.2 --- Fluctuation in Spatial Distribution --- p.45 / Chapter 3.2.3 --- Partition-Temperature Model --- p.48 / Chapter 3.2.4 --- Negative Charged Particles --- p.52 / Chapter 3.3 --- Discussion --- p.54 / Chapter 3.4 --- Conclusion --- p.60 / Chapter 4. --- Geometric Model for Multiplicity Distribution in Nucleus-Nucleus Scattering --- p.64 / Chapter 4.1 --- Introduction --- p.64 / Chapter 4.2 --- Simple Model --- p.70 / Chapter 4.2.1 --- Opacity --- p.70 / Chapter 4.2.2 --- Average Multiplicity n(bi) --- p.73 / Chapter 4.2.3 --- Intrinsic Distribution --- p.74 / Chapter 4.3 --- Analytic Form for ψ(Z) --- p.80 / Chapter 4.4 --- Intrinsic Distribution --- p.85 / Chapter 4.4.1 --- Model 1 --- p.87 / Chapter 4.4.2 --- Model 2 --- p.88 / Chapter 4.4.3 --- Model 3 --- p.90 / Chapter 4.4.4 --- Second Moment --- p.94 / Chapter 4.5 --- Discussion --- p.95 / Chapter 4.6 --- Conclusion --- p.98 / Chapter 5. --- Conclusion --- p.100 / References --- p.103

Thesis (M.S.)--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 9, 2007) Includes bibliographical references.

Thesis (Ph. D.)--University of Chicago, Department of Astronomy and Astrophysics, August 2003. / Includes bibliographical references. Also available on the Internet.