Long time delay before lasing in a II-VI laser diode has been observed. Due to this delay, a nominal threshold current increases as the width of applied current pulse becomes shorter. This delay is attributed to the internal Q switching caused by the balance of injected carriers, temperature rise and gain-guiding. By fitting the calculated data to the experimental ones, rates of refractive index change with carrier concentration and with temperature have been estimated.
It is a high merit of this book to emphasize that "philosophy properly speaking is characterized by the kind of logic it employs, for what it employs it assumes, however silently; and what it assumes it presupposes. The logic stands behind the ontology and is, so to speak, metaphysically prior." By "logic" here is meant a species of philosophical logic, concerned in part with "systematic metaphysics" and with "critical ontology." The term "Grand Logic" is due to Peirce, but has been (...) given a more modern reading by George Berry and Hao Wang. Feibleman uses the phrase in the plural to seek out the "common assumptions of the leading western logicians from Aristotle to Quine." However, the only logicians whose work is discussed at any depth are Aristotle, Frege, Whitehead, Russell, and Quine, with only the most casual reference to Ockham, Duns Scotus, Leibniz, De Morgan, Boole, Schröder, Peirce himself, Lesniewski, Carnap, Tarski, and Gödel, all "leading" logicians surely in any suitable list. Also there is total neglect of all recent work in systematic semantics and pragmatics of the very kind that is of the greatest metaphysical relevance. To determine with precision the assumptions common to the work of all of these writers would be a formidable historical as well as analytic task. Nonetheless, the use of modern logic in the detailed formulation of specific metaphysical systems has great promise for the future, as does the criticism of alternative "logics" within the context of specific metaphysical assumptions.--R.M.M. (shrink)
The place of Thomas’ many expositions of and commentaries on the works of Aristotle has to be faced sooner or later by any student of his thought. If his thought is essentially an extended footnote to Aristotle’s, those commentaries will be of supreme importance; if, thanks to the role of esse, Thomas’ thought is unlike any other before or since, Aristotle can be cast in the role of principal foil the better to show forth the originality of Thomism. That Thomas (...) himself seems to be unaware of any fundamental divergence between himself and Aristotle, that the commentaries represent an effort that continues into the last period of his life, going on independently of his teaching, only adds zest to the question. And, needless to say, when we compare the Thomistic commentaries and their discernment of a well-wrought literary whole in each of the works of Aristotle, including the Metaphysics, with the fragmented Aristotle who survives in the wake of Jaeger’s influence, the matter becomes irresistably attractive. What precisely is Thomas doing as he pores over the text of Aristotle? (shrink)
This is a translation of the text as it is found in Migne’s Patrologia Latina, and Stump helpfully includes the column numbers of that edition in her English version of it. She did check the 1570 Glareanus edition and notes some discrepancies between it and the Patrologia text, but her chief concern was to translate, not to edit, in order that a remarkable work might be put into the hands of those for whom Latin is an impediment. The interest of (...) this book is far from being confined to neophytes, however; indeed, for many the principal attraction of the book will lie in Stump’s notes and in her essays which make up part 2. The actual translation takes up only sixty-six pages, so there is a great deal here for the reader to savor, over and above what, on the basis of a few comparisons, I judge to be a faithful and accurate translation. as "offense against the sovereignty of the people or that of extortion by a provincial governor, fall under the judicial genus" does seem a trifle anachronistic. But then one finds "Watergate" in the index.). (shrink)
This volume contains twelve previously published essays, dealing with non-formal modes of inference, with some specifically logical issues, with language and symbolic representation, with Goodman, Chomsky, and Skinner. In the first, "Reasonableness," we are told that "it would be heroic folly to aspire to be reasonable in all situations," and that reasonableness turns out to be "a somewhat humdrum, pedestrian virtue, involving... a problematic calculation of probabilities and expected values in situations of inescapable fallibility." Still, we are happily told that (...) "in a situation in which it is uncertain which action to take, an action is reasonable if there is some sufficient reason to take it, and no better reason to choose one of the alternatives.". (shrink)