This book is of little interest except to those tracing back the neo-scholastic sources of such figures as Maréchal, Coreth, Rahner, et al. The introductory essay by G. Isaye, supposedly designed to give a summary description of Scheurer's method, is a masterpiece of obscure writing even for those acquainted with neoscholastic jargon. The rest of the volume consists of twelve very desultory essays by Scheurer. In these essays Scheurer struggles to pour the philosophy of the ego à la Kant and (...) his successors into scholastic molds. This synthesis is done in the name of the transcendental method, but what results is historically dubious and philosophically tortured. Though ambiguities abound, Scheurer was ahead of most of his scholastic contemporaries in that he tried to come to grips with Kant and to see in Kant someone more than the malin genie of modern philosophy. Unfortunately, the editor does not date Scheurer's essays and one, therefore, cannot determine whether Scheurer first influenced Maréchal or vice-versa--D. J. M. B. (shrink)

In his foreword, Brand Blanshard provides the suitable justification for publishing yet one more book on Berkeley: Berkeley is "curiously modern," and philosophically acute. Twelve competent essays, contributed by as many scholars, testify to the accuracy of Blanshard's judgment. These twelve scholars, all of whom rely on the Luce-Jessop definitive edition, touch upon the major issues of Berkeley's philosophy: perception, substance, spirit, and God. Differences in interpretation are everywhere evident, but Berkeley is nowhere given facile treatment or quick dismissal. Of (...) the many good essays, Ian T. Ramsey's on "Berkeley and the Possibility of an Empirical Metaphysics" deserves close attention. Ramsey argues that Berkeley's doctrine of will, soul, mind, etc., should be viewed as forms of personal activity and not on the analogy of Locke's ideas. T. E. Jessop contributes a useful bibliography as well as an essay on "Berkeley as Religious Apologist." The only, very minor, flaw in this distinguished volume is that the editor's own essay, the twelfth, "Berkeley and his Modern Critics" might have been better placed immediately following the foreward.--D. J. M. B. (shrink)

An appropriate kind of curved Hilbert space is developed in such a manner that it admits operators of $\mathcal{C}$ - and $\mathfrak{D}$ -differentiation, which are the analogues of the familiar covariant and D-differentiation available in a manifold. These tools are then employed to shed light on the space-time structure of Quantum Mechanics, from the points of view of the Feynman ‘path integral’ and of canonical quantisation. (The latter contains, as a special case, quantisation in arbitrary curvilinear coordinates when space is (...) flat.) The influence of curvature is emphasised throughout, with an illustration provided by the Aharonov-Bohm effect. (shrink)

The effects in a quantum-mechanical system form a partial algebra and a partially ordered set which is the prototypical example of the effect algebras discussed in this paper. The relationships among effect algebras and such structures as orthoalgebras and orthomodular posets are investigated, as are morphisms and group- valued measures (or charges) on effect algebras. It is proved that there is a universal group for every effect algebra, as well as a universal vector space over an arbitrary field.

The number of discriminable colours is often assumed to be of the order of several million but the extent of detectable chromatic diversity present in individual natural scenes is an open question. Here, the aim was to estimate the number of discriminable colours seen in natural scenes. Hyperspectral data were obtained from a set of natural scenes over the range 400 - 720 nm at 10 nm intervals (Nascimento et al, 2002 Journal of the Optical Society of America A 19 (...) 1484 - 1490) and the representation of each scene in CIELAB space computed for all pixels of the image. The number of discriminable colours was estimated by counting the number of unit volumes in the three-dimensional volume defined by the scene when represented in CIELAB space. We found that the number of discriminable colours estimated in a scene could vary by an order of magnitude from scene to scene, but rarely exceeded 105, indicating a limited chromatic diversity. (shrink)

Classical mechanics is presented so as to render the new formulation valid for an arbitrary temporal variable, as opposed to Newton’s Absolute Time only. Newton’s theory then becomes formally identical (in a precise sense) to relativity, albeit in a three-dimensional manifold. (The ultimate difference between the two dynamics is traced to the existence of the relativistic ‘mass-shell’ condition.) A classical Lagrangian is provided for our formulation of the equations of motion and it is related to one of the known forms (...) of the corresponding relativistic Lagrangian, which is the analogue of the Polyakov Lagrangian of string theory. (shrink)

Loop regions in proteins have traditionally been described as ‘random coil’, although they are known to adopt well‐defined conformations in most globular proteins. In this contribution we summarize the results of detailed analysis of the structures and sequences of these loop regions in proteins of known three‐dimensional structure. We also describe how these results can be used as an aid to protein design, modification and modelling.

Deformation quantisation is applied to ordinary Quantum Mechanics by introducing the star product in a configuration space combining a Riemannian structure with a Poisson one. A Hilbert space compatible with such a configuration space is designed. The dynamics is expressed by a Hermitian Hamiltonian containing a scalar potential and a one-form potential. As a simple illustration, it is shown how a particular type of non-commutativity of the star product is interpretable as generating the Zeeman effect of ordinary Quantum Mechanics.

Recent studies using functional magnetic resonance imaging of patients in a vegetative state have raised the possibility that such patients retain some degree of consciousness. In this paper, the ethical implications of such findings are outlined, in particular in relation to decisions about withdrawing life-sustaining treatment. It is sometimes assumed that if there is evidence of consciousness, treatment should not be withdrawn. But, paradoxically, the discovery of consciousness in very severely brain-damaged patients may provide more reason to let them die. (...) Although functional neuroimaging is likely to play an increasing role in the assessment of patients in a vegetative state, caution is needed in the interpretation of neuroimaging findings. (shrink)

We argue that after the passage of a physician assisted death law some inequities in the health care system which prevent people from getting the medical care they need will become reasons for choosing assisted death. This raises the issue of whether there is compelling moral reason to change those inequities after the passage of an assisted death law. We argue that the passage of an assisted death law will not create additional moral reasons for eliminating inequities simply because they (...) become motives for someone to opt for assisted death. We also argue that it is not feasible to eliminate these reasons for opting for assisted death by granting a right to health care because of an intractable scarcity of medical resources. (shrink)

We investigate a possible form of Schrödinger’s equation as it appears to moving observers. It is shown that, in this framework, accelerated motion requires fictitious potentials to be added to the original equation. The gauge invariance of the formulation is established. The example of accelerated Euclidean transformations is treated explicitly, which contain Galilean transformations as special cases. The relationship between an acceleration and a gravitational field is found to be compatible with the picture of the ‘Einstein elevator’. The physical effects (...) of an acceleration are illustrated by the problem of the uniformly-accelerated harmonic oscillator. (shrink)

Introduction: Variation across research ethics boards in conditions placed on access to medical records for research purposes raises concerns around negative impacts on research quality and on human subject protection, including privacy.Aim: To study variation in REB consent requirements for retrospective chart review and who may have access to the medical record for data abstraction.Methods: Thirty 90-min face-to-face interviews were conducted with REB chairs and administrators affiliated with faculties of medicine in Canadian universities, using structured questions around a case study (...) with open-ended responses. Interviews were recorded, transcribed and coded manually.Results: Fourteen sites required individual patient consent for the study to proceed as proposed. Three indicated that their response would depend on how potentially identifying variables would be managed. Eleven sites did not require consent. Two suggested a notification and opt-out process. Most stated that consent would be required if identifiable information was being abstracted from the record. Among those not requiring consent, there was substantial variation in recognising that the abstracted information could potentially indirectly re-identify individuals. Concern over access to medical records by an outside individual was also associated with requirement for consent. Eighteen sites required full committee review. Sixteen allowed an external research assistant to abstract information from the health record.Conclusions: Large variation was found across sites in the requirement for consent for research involving access to medical records. REBs need training in best practices for protecting privacy and confidentiality in health research. A forum for REB chairs to confidentially share concerns and decisions about specific studies could also reduce variation in decisions. (shrink)