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.

It is not easy for an Englishman to acquire a competent knowledge of French philosophy. For one thing there are so many French philosophers writing so many books, and for another the multiplicity of men is matched by the variety of views. In a country where a knowledge of philosophy is expected of any cultivated man, and where the flourishing of philosophy in school and university curricula is regarded as a condition of intellectual freedom, this variety is accepted as part (...) of the cultural background. Professor Bréhier's Transformation de la Philosophie Française must, even so, be of great value to French readers, because of the author's capacity-so admirably shown already in a History of Philosophy that is unquestionably the best now obtainable-to pick out what is essential in a welter of theories, arguments, and mere pronouncements. To English readers, whose knowledge of the background is necessarily limited, this book is particularly valuable, not only for the clarification it brings, but also for a bibliography that is closely related to the text. M. Bréhier observes that French philosophers of the generation that followed and criticized Durkheim, Bergson and Brunschwicg showed themselves acutely conscious of the discontinuities of things, and puritanically averse to the construction of philosophical systems. M. Bréhier, however, does not take this anti-systematic, pluralist tendency at its own valuation. French philosophy, he thinks, is in a phase that makes it comparable to medieval philosophy. It was characteristic of medieval philosophy that it comprised no individually constructed systems like those, for example, of Descartes, Leibniz, Hegel, and Schopenhauer, which have grown up and died away in Europe since the Renaissance. The main reason for this was that Christianity itself provided a common system which was never to be questioned, so that philosophers concerned themselves not with systems, for that would have led to heresy, but with particular problems. Part of M. Bréhier's parallel with modern times is that some Christians and all Marxists aim to produce the same condition. (shrink)

An outline of the life of Heraclides and his fragmentary writings (on the theory of matter, astronomy, ethical and religious topics) is followed by an attempt to reconstruct his thought. He emerges as not so much a profound thinker as a many-sided writer of considerable literary gifts and occasional flashes of brilliance.

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)

BackgroundAn ethics reflection group is one of a number of ethics support services developed to better handle ethical challenges in healthcare. The aim of this article is to evaluate the significance of ERGs in psychiatric and general hospital departments in Denmark.MethodsThis is a qualitative action research study, including systematic text condensation of 28 individual interviews and 4 focus groups with clinicians, ethics facilitators and ward managers. Short written descriptions of the ethical challenges presented in the ERGs also informed the analysis (...) of significance.ResultsA recurring ethical challenge for clinicians, in a total of 63 cases described and assessed in 3 ethical reflection groups, is to strike a balance between respect for patient autonomy, paternalistic responsibility, professional responsibilities and institutional values. Both in psychiatric and general hospital departments, the study participants report a positive impact of ERG, which can be divided into three categories: 1) Significance for patients, 2) Significance for clinicians, and 3) Significance for ward managers. In wards characterized by short-time patient admissions, the cases assessed were retrospective and the beneficiaries of improved dialogue mainly future patients rather than the patients discussed in the specific ethical challenge presented. In wards with longer admissions, the patients concerned also benefitted from the dialogue in the ERG.ConclusionThis study indicates a positive significance and impact of ERGs; constituting an interdisciplinary learning resource for clinicians, creating significance for themselves, the ward managers and the organization. By introducing specific examples, this study indicates that ERGs have significance for the patients discussed in the specific ethical challenge, but mostly indirectly through learning among clinicians and development of clinical practice. More research is needed to further investigate the impact of ERGs seen from the perspectives of patients and relatives. (shrink)

Gotthold Ephraim Lessing, thinker, dramatist and controversialist of many-sided interests, is the most representative figure of the German Enlightenment. His defence of Spinoza, who had traditionally been condemned as an atheist, provoked a major controversy in philosophy, and his publication of H. S. Reimarus' radical assault on Christianity led to fundamental changes in Protestant theology. This volume presents the most comprehensive collection to date in English of Lessing's philosophical and theological writings, several of which are here translated for the first (...) time. They are edited and translated by H. B. Nisbet, who also provides an introduction that sets them in their historical and philosophical contexts. (shrink)