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Thesis (M.S.)--Ohio University, August, 1996. / Title from PDF t.p.

Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisor: Douglas R. Lloyd. Vita. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 102-104).

This study examined response persistence during extinction following the delivery of quantity- or time-based reinforcers. Three typically developing preschool students participated in the study. In Experiment 1, equally preferred quantity-based and time-based reinforcers were identified for each participant. In Experiment 2, response persistence was evaluated during extinction following a period of reinforcement using equivalent variable interval schedules assigned to each reinforcement type. The results of this research further support the finding that reinforcement rate is a predictor of persistence (Nevin, 1974). However, type of reinforcer (i.e., quantity-based or time-based) did not have a uniform effect on the persistence of responding once extinction was implemented.

Invoking Maxwell's classical equations in conjunction with expressions for the electromagnetic (EM) energy, momentum, force, and torque, we use a few simple examples to demonstrate the nature of the EM angular momentum. The energy and the angular momentum of an EM field will be shown to have an intimate relationship; a source radiating EM angular momentum will, of necessity, pick up an equal but opposite amount of mechanical angular momentum; and the spin and orbital angular momenta of the EM field, when absorbed by a small particle, will be seen to elicit different responses from the particle.

The statefunctions of massless particles described by a tensor field are classified by expressing them in terms of the eigenstates of the operator of angular momentum. The general tensor statefunction can also be separated into functions of different parity. By identifying the graviton as a special case obtained by imposing certain auxiliary conditions, familiar from the classical theory of gravitation, one arrives at a multipole analysis of single graviton state-functions. Employing standard composition methods one can use these results to arrive at selection rules governing the decay of objects into two or more gravitons. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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