Resonance production by energetic pions in hydrogen

An experiment has been described in which the interactions of positive pions in a hydrogen bubble chamber have been examined. Four lines of investigation have been followed. 1. The general behaviour of interactions in which four positively charged secondary particles are produced has been described. The cross-sections for these interactions and for different final states have been measured, and these have been found to be in reasonable agreement with these founding other experiments at different incident pion momentum. An examination has been made of the resonance production in reactions leading to the most common final states. Again, the results are in agreement with those from other experiments. 2. The quasi-two-body interaction :- π(^+) →N (→pπ(^+), pº(→π(^+)π(^-) π(^+) N (→pπ(^+), wº(→π(^+)π(^-)πº have been studied using the Gottfried-Jackson method of analysis. The spin density matrix elements obtained in this experiment are in agreement with the absorption model ion the first of those reactions, but in poor agreement for the second reaction, as has also been found in other experiments. The decay angular distribution of the B(^+) meson has been examined. He observed distribution is consistent with J(^P) assignment of 1(^+). 4. Different decay mode of the A (_2) meson have been observed, and a sample of two pronged events with at least one visible Vº decay was examined in order to observe the KK decay mode. The observed branching ratios are in agreement with those observed n other experiment. The recent suggestion that there may be more than one resonance with a mass in the region of the A(_2) mass has been investigated by examining the pn and the KK decay modes of the A(_2) separately. The observed characteristics of the two decay modes is consistent with the assumption that only one meson exists with mass in the region of 1.3 GeV/c(^2)

Approaching death in the classical tradition

The thesis consists of five chapters: the first functions as an overture; the second, third and fourth deal with Plato, Cicero and Montaigne respectively; and the fifth raises some questions. The overture explores the ways in which Odysseus, Lucretius and Seneca approached death, and in the process introduces some obvious distinctions - between death viewed as the act of dying and death viewed as the state of being dead, between the death which comes to everyone and the death which comes to me, between our own death and the death of others - and anticipates certain recurring themes. The second chapter, on Plato, is concerned chiefly with the Phaedo and the question of what is involved in "the practice of death". This entails an examination of related concepts and terminology in the Gorgias and the Republic, and of the whole subject of Platonic myth. The third chapter discusses Cicero's views on death and immortality - both the considered reflections of the philosopher and the spontaneous reactions of the bereaved father - principally as these emerge from the Tusculan Disputations and the letters to Atticus. The fourth chapter approaches Montaigne - his own experiences of death, the relationship between his earlier and later approaches, the tension between his professed Catholicism and his pagan inclinations, the difficulty and perhaps undesirability of extracting a 'message' from the Essais on this or any other subject. The conclusion asks to what extent these various approaches succeed in what they set out to do, and whether any generalised, objective approach to death can ever successfully address the individual predicament, either in relation to one's own death or in facing bereavement.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

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Boolean comparison is a design verification technique in which two logic networks are compared for functional equivalence using analysis rather than simulation. Boolean comparison was used on the IBM 3081 project to establish that hardwareflow-charts and the detailed hardware logic design were functionally equivalent. Hardware flowcharts are a graphic form of a hardware description language which describes the logical behavior of the machine in terms of the inputs, outputs, and latches. The logical correctness of the hardware flowcharts was previously established via cycle simulation. The concepts and techniques of Boolean comparison as used on the IBM 3081 project are described. 1

Increased formation of S-nitrothiols and nitrotyrosine in cirrhotic rats during endotoxemia

10.1016/S0891-5849(01)00647-5Free Radical Biology and Medicine316790-798FRBM

Acetaldehyde emission by the leaves of trees - correlation with physiological and environmental parameters

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