It is demonstrated on the basis of the Dirac equation that quarks cannot be confined by a vector gluon potential of the form(r/r 0)a or[ln(r/r 0]a, a>0, if the quark-gluon interaction conserves parity. In order to confine quarks with the parity-conserving interaction, the effective gluon potential must be a pseudovector or a scalar. These are shown in a simple Yang-Mills field with theSU(2) group.

This collection of essays in honor of Prof. Stig Andur Pedersen's 60th Birthday spans over a broad scope of topics, ranging from mathematical modelling over realism in philosophy of science to an analysis of apology after medical mistakes. The unusually broad range is a fair but still inadequate reflection of the work of Stig Andur Pedersen, a philosopher and scientist whose range of interests, abilities and production is itself unusually broad.

H.B.G. Casimir's life, interests and works are intertwined with the important developments that have taken place in physics during this century. This book was compiled by his friends and admirers in honour of his 80th birthday and concentrates mainly on Casimir's achievements in the field of physics, though without ignoring the peripheral areas of the history and philosophy of physics in which he was greatly interested. The book is divided into four parts. Part I describes Casimir's teachers, Ehrenfest, Bohr and (...) Pauli, and will be of general interest due to the key role which these physicists played in modern developments. The articles do give new facts and provide new insights into the history of modern physics. Part II consists of essays on recent developments in various areas of physics in which Casimir has taken an active interest, such as the modern concept of time, statistical foundations of electrodynamic theory and field theory. The subjects covered in Part III have been selected because of Casimir's efforts in the industrial research area of physics. They cover past, present and future expectations in research. (shrink)

A total of 944 expressed sequence tags generated 2212 EST loci mapped to homoeologous group 1 chromosomes in hexaploid wheat. EST deletion maps and the consensus map of group 1 chromosomes were constructed to show EST distribution. EST loci were unevenly distributed among chromosomes 1A, 1B, and ID with 660, 826, and 726, respectively. The number of EST loci was greater on the long arms than on the short arms for all three chromosomes. The distribution of ESTs along chromosome arms (...) was nonrandom with EST clusters occurring in the distal regions of short arms and middle regions of long arms. Duplications of group 1 ESTs in other homoeologous groups occurred at a rate of 35.5%. Seventy-five percent of wheat chromosome 1 ESTs had significant matches with rice sequences, where large regions of conservation occurred between wheat consensus chromosome 1 and rice chromosome 5 and between the proximal portion of the long arm of wheat consensus chromosome 1 and rice chromosome 10. Only 9.5% of group 1 ESTs showed significant matches to Arabidopsis genome sequences. The results presented are useful for gene mapping and evolutionary and comparative genomics of grasses. (shrink)

We develop a framework for assessing security market quality, relating five elements of market design to three metrics of market integrity and two metrics of market efficiency. We empirically implement this integrity–efficiency MQ framework by testing a hypothesis that trade-based ramping manipulation at the close raises execution costs on 24 security markets worldwide. Estimating a simultaneous equations model of ramping incidence, spreads, and the probability of deploying real-time surveillance, we show that quoted bid-ask spreads are positively related to the incidence (...) of MTC across seven liquidity deciles. The magnitude is economically significant; improving market integrity by cutting MTC in half reduces spreads 6–11 %. Allowing direct market access in conjunction with RTS, conducting auctions at the close, and developing regulations that require surveillance, all reduce MTC and thereby lower spreads, assuring better market integrity and enhancing market efficiency. Introducing circuit breakers or prohibiting shorts poses integrity–efficiency tradeoffs. (shrink)

A clear presentation and exploration of the philosophical implications of the classical picture of the physical world and the ways in which contemporary physics has changed it. Capek argues that physics has now moved from a universe governed by a "timeless world formula" toward a world which is irreversible and incomplete, where "becoming has been re-instated." The author's careful attention to the differences between the special and general theories of relativity helps to clear up important misconceptions about the space-time continuum (...) and the "dilatation" of time. Capek is more successful in explaining and clarifying physics than he is in assessing its precise philosophic impact.--B. J. H. (shrink)

Many of the selections included are readily available, but the editor has earned our gratitude for reprinting the series of seven papers read before the Aristotelian Society from 1915-1923, and for making readily accessible the 1927 essay, "Time." The somewhat lengthy introduction adds little to the value of the book, and is occasionally inaccurate. --B. J. H.

Sherburne has the two-fold purpose of framing an aesthetic theory which gains its coherence and clarity by its derivation from a speculative system, and of exploring the adequacy of that system by applying it to one dimension of experience. He begins by developing clearly the categorial notions of Whitehead's mature philosophy and exhibiting them as integral parts of the speculative scheme, and in some cases revising and reformulating them significantly. Using this material, he then frames an aesthetic theory treating such (...) questions as the ontological status of a work of art, aesthetic experience, and artistic creation. A well-written study that illuminates some of the more difficult aspects of Whitehead's thought, and contributes to the discussion of the metaphysical issues of aesthetics.--B. J. H. (shrink)

Twenty-four scientists and philosophers contribute to this volume, which constitutes the proceedings of the 1959 meetings of the American Association for the Advancement of Science. Six symposia deal with theory construction; empirical and conventional elements in physical theory; induction, probability and simplicity; the logic of variables and constants; philosophical issues of quantum theory; and the methodology of psychology and the social sciences. Many of the contributions are excellent; most deal with controversial issues, and generate considerable life in the discussions and (...) commentaries.--B. J. H. (shrink)

This historico-critical analysis of the concept of mass is the third in Jammer's series of studies of fundamental physical concepts. His fascinating account traces its intricate historical evolution from early notions of matter and the medieval concept of mass as quantitas materiae to the dynamic conceptions of mass. The concept is followed through the three stages of conceptualization ; systematization ; and formalization. Jammer further treats mass in relation to the electromagnetic theories; special and general relativity; quantum mechanics and the (...) theory of elementary particles; and the modern "space-theories" of matter. He concludes that no final clarification of the concept has yet been attained, despite the efforts of both physicists and philosophers. This difficult material is handled with great scholarship and control, skillfully interpreted, and concisely presented --B. J. H. (shrink)

In this introduction to social problems, sixteen social scientists discuss the major forms of deviant behavior and social disorganization. The introduction attempts to elicit the general theoretical orientation which is implicit in the specialized studies making up the main body of the book.--B. J. H.

In this inaugural address, a professor of applied mathematics develops the theme that new concepts such as "entropy" introduced in the mathematical description of nature have an influence far beyond the mathematical sciences, extending to such diverse fields as biology, the social sciences, religion, philosophy, literary analysis, etc.--B. J. H.

The brain adapts to changes that take place in the body. Deprivation of input results in size reduction of cortical representations, whereas an increase in input results in an increase of representational space. Amputation forms one of the most dramatic disturbances of the integrity of the body. The brain adapts in many ways to this breakdown of the afferent–efferent equilibrium. However, almost all studies focus on the sensorimotor consequences. It is not known whether adaptation takes place also at other “levels” (...) in the system. The present study addresses the question whether amputees dream about their intact body, as before the amputation, or about the body after the amputation and whether the dream content was a function of time since the amputation and type of amputation. The results show that the majority of the dreamers reported dreams about their intact body although the mean time that elapsed since the amputation was twelve years. There is no clear relation with the type of amputation. The results give modest evidence for the existence of a basic neural representation of the body that is, at least, partly genetically determined and by this relatively insensitive for changes in the sensory input. (shrink)

Sherburne has the two-fold purpose of framing an aesthetic theory which gains its coherence and clarity by its derivation from a speculative system, and of exploring the adequacy of that system by applying it to one dimension of experience. He begins by developing clearly the categorial notions of Whitehead's mature philosophy and exhibiting them as integral parts of the speculative scheme, and in some cases revising and reformulating them significantly. Using this material, he then frames an aesthetic theory treating such (...) questions as the ontological status of a work of art, aesthetic experience, and artistic creation. A well-written study that illuminates some of the more difficult aspects of Whitehead's thought, and contributes to the discussion of the metaphysical issues of aesthetics.--B. J. H. (shrink)

A survey of contemporary physical science, and an attempt to envision a philosophy in harmony with it. The discussion of physics centers on three topics: the status of postulates and first principles; the movement away from limited forms of empiricism toward the acknowledgment of aesthetic and metaphysical considerations in framing theories; and the disappearance of mechanical models in favor of increasingly abstract mathematical formulations. The exposition of physical theory is lively and imaginative; the treatment of the more properly philosophical problems (...) is stimulating, but will often leave the reader wishing for a more searching analysis.--B. J. H. (shrink)

The essays included are somewhat uneven in value; some advance interpretations and criticisms, others are mainly expositional. Various aspects of Whitehead's later thought are discussed: the doctrine of feelings, actual occasions, causal efficacy, symbolic reference, mathematics, and the philosophy of history. Hartshorne's philosophy is examined in a seventh essay by Andrew Reck.--B. J. H.

A series of five lectures delivered at Yale University, this book discusses the historical and technological roots of natural science, its present organization, and its probable future in our scientific civilization. A particularly good chapter on the "Diseases of Science" discusses some of the problems of science's internal economy--its increasing specialization, the exponential growth rate of scientific publications, and the consequent difficulties for scientific education and research. A fascinating and well-written account.--B. J. H.

A discussion of "the time-concept" which depends heavily upon physical theory for its basis and conclusions. Within these limits, it is thorough, careful, and sometimes illuminating. The physical meanings of "direction" and "irreversibility" of time are thoroughly explored; the relation of time to entropy is discussed, as well as the concept of time in relativity and quantum theory. The principal original contribution of the book is its suggested distinction between "Lorentz-" and "Clausius-processes" as a means for solving the clock problems (...) of special relativity. --B. J. H. (shrink)

This is a book in "theoretical chronometry," a study of the time-concept in its widest scope. It includes discussions of the physiological, psycho logical, and sociological aspects of time. While the treatment of large philosophical issues is sometimes too easy, the author has incorporated an enormous body of material.--B. J. H.

A clear presentation and exploration of the philosophical implications of the classical picture of the physical world and the ways in which contemporary physics has changed it. Capek argues that physics has now moved from a universe governed by a "timeless world formula" toward a world which is irreversible and incomplete, where "becoming has been re-instated." The author's careful attention to the differences between the special and general theories of relativity helps to clear up important misconceptions about the space-time continuum (...) and the "dilatation" of time. Capek is more successful in explaining and clarifying physics than he is in assessing its precise philosophic impact.--B. J. H. (shrink)

The second in the series from the Philosophy of Science Institute at St. John's University, this volume contains four essays by guest lecturers at the Institute, and provides "a summary introduction to the leading Thomistic philosophies of science in vogue today among those who believe that the philosophy of nature has an autonomy of its own, and is not applied metaphysics." The papers include an essay on Maritain's philosophy of science; a discussion of the Bohr atom; and examinations of scientific (...) method, and the subject-matter of the philosophy of nature.--B. J. H. (shrink)

Fourteen contributors present papers treating a wide variety of subjects. The treatments range from exposition, through sympathetic enlargement and development, to more critical explorations and the formulation of alternative views.--B. J. H.

This study in the philosophy of science analyzes "the logic of scientific inquiry and the logical structure of its intellectual products." The author distinguishes four patterns of scientific explanation: the deductive model, probabilistic explanation, functional and teleological explanation, and genetic explanation. The structure and application of each is explored with respect to some of the more specialized areas of science. Many of the traditional problems of philosophy of science are discussed, and there are excellent treatments of the methodology of the (...) social sciences and historical explanation. A large and important book, presenting a vast amount of material handled in an incisive manner.--B. J. H. (shrink)

Primarily a source book for introductory courses in epistemology, this book presents a good selection of most of the essential readings in basic epistemology. Critical notes are offered mainly from an Aristotelian-Thomistic standpoint.--D. P. B.

Taking as its central question, "How do bodies act on one another across space?", this book traces the answers which have been given from the Pre-Socratics to current physical theory. The basic thought guiding the discussion is that the conceived mode of action between bodies is a general property exhibited by the model of a current physical theory. The study is rich in primary material, and carefully documented throughout; it fulfills a long-felt need for a thorough and careful treatment of (...) this subject.--B. J. H. (shrink)