On the cohomology of some exceptional symmetric spaces

This is a survey on the construction of a canonical or "octonionic K\"ahler" 8-form, representing one of the generators of the cohomology of the four Cayley-Rosenfeld projective planes. The construction, in terms of the associated even Clifford structures, draws a parallel with that of the quaternion K\"ahler 4-form. We point out how these notions allow to describe the primitive Betti numbers with respect to different even Clifford structures, on most of the exceptional symmetric spaces of compact type.Comment: 12 pages. Proc. INdAM Workshop "New Perspectives in Differential Geometry" held in Rome, Nov. 2015, to appear in Springer-INdAM Serie

A pesquisa em enfermagem na América Latina: 1988-1998

The purpose of this article is to provide an overview of nursing research in Latin America during the decade from 1988 to 1998. Data from the bi-annual Pan American Colloquia in Nursing Research from 1988 to 1998 were subject to secondary analysis. Findings indicate that most of the research emanated from Brazil, the only country with a doctoral program in nursing in the 1990's. Research topics included: public health issues, clinical studies (usually of adults), nursing care studies of process, therapeutic communication, and administrative issues such as standards of care and quality. The most common design was descriptive quantitative, although there were several qualitative studies. The analysis provides directions for future research and indicates areas of concern, especially the need for theory based nursing research.El propósito de este artículo es ofrecer un panorama sobre la investigación en enfermería en América Latina durante la década de 1988 a 1998. La información reunida en los Coloquios Panamericanos de Investigación en Enfermería, que se celebran cada dos años, fue sometida a análisis secundario. Descubrimos que la mayor parte de las investigaciones emana del Brasil, el único país con un programa de doctorado en enfermería en los años noventa. Los tópicos de investigación incluyen asuntos de salud pública, estudios clínicos (normalmente de adultos), estudios del proceso de atención de enfermería, comunicación terapéutica y asuntos administrativos tales como normas de atención y calidad. El diseño más común fue el estudio cuantitativo descriptivo, aunque también encontramos varios estudios cualitativos. El análisis ofrece direcciones para futuras investigaciones e indica áreas de preocupación, especialmente la necesidad de una investigación en enfermería con base teórica.O objetivo do presente artigo é oferecer um panorama da pesquisa em enfermagem na América Latina realizada durante a década de 1988 a 1998. A informação reunida nos Colóquios Pan-Americanos de Pesquisa em Enfermagem, organizados a cada dois anos, foi submetida à análise secundária. Descobrimos que a maior parte das pesquisas foi produzida no Brasil, o único país com um programa de doutorado em enfermagem nos anos noventa. Os temas de pesquisa incluem tópicos de saúde pública, estudos clínicos (normalmente de adultos), estudos do processo de assistência de enfermagem, comunicação terapêutica e assuntos administrativos, tais como normas de cuidado e qualidade. O desenho mais comum foi o estudo quantitativo descritivo, mas também encontramos vários estudos qualitativos. A análise oferece direções para futuras pesquisas e indica áreas de preocupação, especialmente a necessidade de pesquisas de enfermagem com fundamentação teórica

Routh reduction for singular Lagrangians

This paper concerns the Routh reduction procedure for Lagrangians systems with symmetry. It differs from the existing results on geometric Routh reduction in the fact that no regularity conditions on either the Lagrangian $L$ or the momentum map $J_L$ are required apart from the momentum being a regular value of $J_L$. The main results of this paper are: the description of a general Routh reduction procedure that preserves the Euler-Lagrange nature of the original system and the presentation of a presymplectic framework for Routh reduced systems. In addition, we provide a detailed description and interpretation of the Euler-Lagrange equations for the reduced system. The proposed procedure includes Lagrangian systems with a non-positively definite kinetic energy metric.Comment: 34 pages, 2 figures, accepted for publicaton in International Journal of Geometric Methods in Modern Physics (IJGMMP

Revisionary Copyright: A Ghost of the Past or a Current Trap to Assignments of Copyright?

Worldwide copyright assignments that contain a choice of law clause are the norm. National copyright laws in the United Kingdom and Spain do, however, contain provisions on reversionary copyright in their transition provision. These provisions would, if applicable, terminate the assignment 25 years after the death of the author and hand the copyright back to the author's successors in title rather than the assignees. From a choice of law pwerspective this becomes a classification issue. This article argues that we are dealing with a transferability issue and that the issue cannot be classified as contractual. That puts numerous assignments at risk

Local Anomalies, Local Equivariant Cohomology and the Variational Bicomplex

The locality conditions for the vanishing of local anomalies in field theory are shown to admit a geometrical interpretation in terms of local equivariant cohomology, thus providing a method to deal with the problem of locality in the geometrical approaches to the study of local anomalies based on the Atiyah-Singer index theorem. The local cohomology is shown to be related to the cohomology of jet bundles by means of the variational bicomplex theory. Using these results and the techniques for the computation of the cohomology of invariant variational bicomplexes in terms of relative Gel'fand-Fuks cohomology introduced in [6], we obtain necessary and sufficient conditions for the cancellation of local gravitational and mixed anomalies.Comment: 36 pages. The paper is divided in two part

Comorbidity and osteoporotic fracture: approach through predictive modeling techniques using the OSTEOMED registry

Purpose To examine the response to anti-osteoporotic treatment, considered as incident fragility fractures after a minimum follow-up of 1 year, according to sex, age, and number of comorbidities of the patients. Methods For this retrospective observational study, data from baseline and follow-up visits on the number of comorbidities, prescribed anti-osteoporotic treatment and vertebral, humerus or hip fractures in 993 patients from the OSTEOMED registry were analyzed using logistic regression and an artificial network model. Results Logistic regression showed that the probability of reducing fractures for each anti-osteoporotic treatment consid- ered was independent of sex, age, and the number of comorbidities, increasing significantly only in males taking vitamin D (OR = 7.918), patients without comorbidities taking vitamin D (OR = 4.197) and patients with ≥ 3 comorbidities taking calcium (OR = 9.412). Logistic regression correctly classified 96% of patients (Hosmer–Lemeshow = 0.492) compared with the artificial neural network model, which correctly classified 95% of patients (AUC = 0.6). Conclusion In general, sex, age and the number of comorbidities did not influence the likelihood that a given anti-osteoporotic treatment improved the risk of incident fragility fractures after 1 year, but this appeared to increase when patients had been treated with risedronate, strontium or teriparatide. The two models used classified patients similarly, but predicted differently in terms of the probability of improvement, with logistic regression being the better fit