6,147 research outputs found
Interacting vector fields in Relativity without Relativity
Barbour, Foster and \'{O} Murchadha have recently developed a new framework,
called here {\it{the 3-space approach}}, for the formulation of classical
bosonic dynamics. Neither time nor a locally Minkowskian structure of spacetime
are presupposed. Both arise as emergent features of the world from
geodesic-type dynamics on a space of 3-dimensional metric--matter
configurations. In fact gravity, the universal light cone and Abelian gauge
theory minimally coupled to gravity all arise naturally through a single common
mechanism. It yields relativity -- and more -- without presupposing relativity.
This paper completes the recovery of the presently known bosonic sector within
the 3-space approach. We show, for a rather general ansatz, that 3-vector
fields can interact among themselves only as Yang--Mills fields minimally
coupled to gravity.Comment: Replaced with final version accepted by Classical and Quantum Gravity
(14 pages, no figures
Towards the Unification of Gravity and other Interactions: What has been Missed?
Faced with the persisting problem of the unification of gravity with other
fundamental interactions we investigate the possibility of a new paradigm,
according to which the basic space of physics is a multidimensional space
associated with matter configurations. We consider general
relativity in . In spacetime, which is a 4-dimensional subspace of
, we have not only the 4-dimensional gravity, but also other
interactions, just as in Kaluza-Klein theories. We then consider a finite
dimensional description of extended objects in terms of the center of mass,
area, and volume degrees of freedom, which altogether form a 16-dimensional
manifold whose tangent space at any point is Clifford algebra Cl(1,3). The
latter algebra is very promising for the unification, and it provides
description of fermions.Comment: 11 pages; Talk presented at "First Mediterranean Conference on
Classical and Quantum Gravity", Kolymbari, Crete, Greece, 14-18 September
200
Creating Effective Tier II Behavior Support Plans for Individual Students.
Participants will explore several problem solving protocols that design effective Tier II behaviors plans for indvidual students. Using the PTRR framework, participants will learn how to select a problem behavior. identify it\u27s common pattern, and select strategies and interventions designed to Prevent the triggering event, Teach a new skill, Reinforce the new & improved behavior, & Respond to the problem behavior.
These problem solving protocols are effective tools to identify supportive solutions to problem behaviors at school, in the home, and in the community
The geometry of the Barbour-Bertotti theories II. The three body problem
We present a geometric approach to the three-body problem in the
non-relativistic context of the Barbour-Bertotti theories. The Riemannian
metric characterizing the dynamics is analyzed in detail in terms of the
relative separations. Consequences of a conformal symmetry are exploited and
the sectional curvatures of geometrically preferred surfaces are computed. The
geodesic motions are integrated. Line configurations, which lead to curvature
singularities for , are investigated. None of the independent scalars
formed from the metric and curvature tensor diverges there.Comment: 16 pages, 2 eps figures, to appear in Classical and Quantum Gravit
Sickness certification system in the United Kingdom: qualitative study of views of general practitioners in Scotland
Objectives: To explore how general practitioners operate the sickness certification system, their views on the system, and suggestions for change.
Design: Qualitative focus group study consisting of 11 focus groups with 67 participants.
Setting: General practitioners in practices in Glasgow, Tayside, and Highland regions, Scotland.
Sample: Purposive sample of general practitioners, with further theoretical sampling of key informant general practitioners to examine emerging themes.
Results: General practitioners believed that the sickness certification system failed to address complex, chronic, or doubtful cases. They seemed to develop various operational strategies for its implementation. There appeared to be important deliberate misuse of the system by general practitioners, possibly related to conflicts about roles and incongruities in the system. The doctor-patient relationship was perceived to conflict with the current role of general practitioners in sickness certification. When making decisions about certification, the general practitioners considered a wide variety of factors. They experienced contradictory demands from other system stakeholders and felt blamed for failing to make impossible reconciliations. They clearly identified the difficulties of operating the system when there was no continuity of patient care. Many wished either to relinquish their gatekeeper role or to continue only with major changes.
Conclusions: Policy makers need to recognise and accommodate the range and complexity of factors that influence the behaviour of general practitioners operating as gatekeepers to the sickness certification system, before making changes. Such changes are otherwise unlikely to result in improvement. Models other than the primary care gatekeeper model should be considered
Herbal Medicines and Breast Cancer Risk Bibliography
Bibliography on herbal medicines and breast cancer riskBibliography on herbal medicines and breast cancer risk. Includes reviews and commentaries, and references on human epidemiologic studies.New York State Department of Health and Department of Environmental Conservatio
Meat, Poultry and Fish in the Diet and the Risk of Breast Cancer Bibliography
Bibliogaphy on meat, poultry and fish in the diet and the risk of breast cancerBibliography of meat, poultry and fish in the diet and the risk of breast cancer. Includes reviews and commentaries, human epidemiologic studies, animal studies, and food composition references.United States Department of Agriculture CSREES, New York State Department of Health and Cornell Universit
Dairy Products and Breast Cancer Risk Bibliography
Bibliography on the breast cancer risk of dairy productsBibliography on the breast cancer risk from consuming dairy products. Includes review articles and commentaries, clinical and human epidemiologic studies, animal studies and in vitro studies.United States Department of Agriculture CSREES, the New York State Department of Health and Cornell Universit
- …