Baryon magnetic moments and sigma terms in lattice-regularized chiral perturbation theory

An SU(3) chiral Lagrangian for the lightest decuplet of baryons is constructed on a discrete lattice of spacetime points, and is added to an existing lattice Lagrangian for the lightest octets of mesons and baryons. A nonzero lattice spacing renders all loop integrations finite, and the continuum limit of any physical observable is identical to the result obtained from dimensional regularization. Chiral symmetry and gauge invariance are preserved even at nonzero lattice spacing. Specific calculations discussed here include the non-renormalization of a conserved vector current, the magnetic moments of octet baryons, and the pi N and KN sigma terms that relate to the nucleon's strangeness content. The quantitative difference between physics at a nonzero lattice spacing and physics in the continuum limit is easily computed, and it represents an expectation for the size of discretization errors in corresponding lattice QCD simulations.Comment: 19 pages, 5 figures, one paragraph added to introduction, to appear in Phys Rev

Psychosocial work factors and social inequalities in psychological distress: a population-based study.

BACKGROUND: Mental health problems (MHP) are the leading cause of disability worldwide. The inverse association between socioeconomic position (SEP) and MHP has been well documented. There is prospective evidence that factors from the work environment, including adverse psychosocial work factors, could contribute to the development of MHP including psychological distress. However, the contribution of psychosocial work factors to social inequalities in MHP remains unclear. This study evaluates the contribution of psychosocial work factors from two highly supported models, the Demand-Control-Support (DCS) and the Effort-Reward Imbalance (ERI) models to SEP inequalities of psychological distress in men and women from a population-based sample of Quebec workers. METHODS: Data were collected during a survey on working conditions, health and safety at work. SEP was evaluated using education, occupation and household income. Psychosocial work factors and psychological distress were assessed using validated instruments. Mean differences (MD) in the score of psychological distress were estimated separately for men and women. RESULTS: Low education level and low household income were associated with psychological distress among men (MD, 0.56 (95% CI 0.06; 1.05) and 1.26 (95% CI 0.79; 1.73) respectively). In men, the contribution of psychosocial work factors from the DCS and the ERI models to the association between household income and psychological distress ranged from 9% to 24%. No clear inequalities were observed among women. CONCLUSIONS: These results suggest that psychosocial work factors from the DCS and the ERI models contribute to explain a part of social inequalities in psychological distress among men. Psychosocial factors at work are frequent and modifiable. The present study supports the relevance of targeting these factors for the primary prevention of MHP and for health policies aiming to reduce social inequalities in mental health

Building Information Modeling for Cultural Heritage: The Management of Generative Process for Complex Historical Buildings

Building Information Modeling (BIM) enhances the sharing of information during the traditional process for new construction, but most of the time, it requires high levels of knowledge management for the historical digital model (H-BIM). The innovation in the Digital Cultural Heritage (DCH) domain is supported by the development of Information and Communications Technologies (ICT) and modern tools that are able to transmit morphological characteristics of the buildings in all their uniqueness. The latest research in the field of H-BIM shows a significant emergence of innovative methods and management initiatives for the generation of complex historical elements, leading to the confrontation of the paradigm of regularity (simple geometric shapes) with the new paradigm of complexity (historical building elements). This paper proves the benefits of the BIM for project management of the Centre Block of the Canadian Parliament in Ottawa, Ontario Canada, and shows the results obtained by the introduction of Advanced Modeling Techniques (AMT) during the generative process, reducing time and cost for the creation of the complex architectural and structural elements. The uniqueness of the forms of historical buildings is a real value to be transmitted throughout the building’s lifecycle with high Levels of Detail (LOD). Proper management of geometric primitives and Non-Uniform Rational Basis Spline (NURBS) models have guaranteed the conversion of spatial data (point clouds) from laser scanning and photogrammetry (geometric survey) into parametric applications. This paper explores the generative process of one of the most complex spaces within The Centre Block building of Parliament Hill—Confederation Hall

Documentation and dissemination of the sculptural elements of Canada's parliamentary buildings: Methodology development and Volution, a case study

Parliament Hill consists of four historic gothic revival buildings, which form part of the Parliament Buildings National Historic Site of Canada in the National Capital of Ottawa. There are more than 2000 masonry sculptural elements throughout the four buildings. Three of the buildings are in the middle of multi-year rehabilitation projects. Extensive Heritage Documentation is being undertaken to support various activities and conservation teams throughout the interior and exterior of the buildings while also serving as a key posterity records. One of the significant heritage documentation projects is the 3D digitization of the 2000+ heritage character defining sculptural elements. The Heritage Conservation Directorate (HCD) of Public Works and Government Services Canada (PWGSC) was tasked by the Parliamentary Precinct Branch (PPB) of PWGSC to document these character defining elements. The sculptures vary in size from as small as 100mm in width to up to 2 meters in size. This project is in its third year and much has been learned and researched about the most appropriate and efficient means by which to document these elements. Although a methodology was in place to document the sculptures at the inception of the project, it has gone through several iterations in order to improve the gathered data, and in turn incre

Long distance regularization in chiral perturbation theory with decuplet

We investigate the use of long distance regularization in SU(3) baryon chiral perturbation theory with decuplet fields. The one-loop decuplet contributions to the octet baryon masses, axial couplings, S-wave nonleptonic hyperon decays and magnetic moments are evaluated in a chirally consistent fashion by employing a cutoff to implement long distance regularization. The convergence of the chiral expansions of these quantities is improved compared to the dimensionally regularized version which indicates that the propagation of Goldstone bosons over distances smaller than a typical hadronic size, which is beyond the regime of chiral perturbation theory but included by dimensional regularization, is removed by use of a cutoff.Comment: 31 page

Documentation for Emergency Stabilization and the Integrated Conservation Planning of Earthen Architecture Settlements: the Kasbah of Taourirt (Ouarzazate, Morocco)

Heritage recording serves as a basis for methodologies regarding diagnosis, treatment and preservation of historic places and contributes to make posterity records of our built cultural heritage. This work is not a stand-alone practice, but a part of the overall conservation of cultural heritage. Reco