Metric of a Slow Rotating Body with Quadrupole Moment from the Erez-Rosen Metric

A metric representing a slowly rotating object with quadrupole moment is obtained using a perturbation method to include rotation into the weak limit of the Erez-Rosen metric. This metric is intended to tackle relativistic astrometry and gravitational lensing problems in which a quadrupole moment has to be taken into account

A Visualization of Null Geodesics for the Bonnor Massive Dipole

In this work we simulate null geodesics for the Bonnor massive dipole metric by implementing a symbolic-numerical algorithm in Sage and Python. This program is also capable of visualizing in 3D, in principle, the geodesics for any given metric. Geodesics are launched from a common point, collectively forming a cone of light beams, simulating a solid-angle section of a point source in front of a massive object with a magnetic field. Parallel light beams also were considered, and their bending due to the curvature of the space-time was simulated.Comment: 9 pages, 5 figures, Presented at XIX Simposio Internacional de M\'etodos Matem\'aticos Aplicados a las Ciencias (19th International Symposium of Mathematical Methods Applied to Sciences, XIX-SIMMAC

Understanding and attitude to environmental problems in familiar small farmers from Brazil and Argentina

A atual problemática ambiental esta fortemente ligada às atividades agrícolas. As atividades agrícolas são consideradas as atividades humanas que mais utilizam recursos naturais em suas técnicas, sendo que a Agricultura Familiar (AF) é responsável por parte destas atividades de grande impacto ambiental. Este trabalho buscou investigar como o agricultor familiar, ator principal das mudanças ambientais no meio rural, compreende os problemas ambientais. Com entrevistas estruturadas em cinco indicadores a pesquisa foi realizada com agricultores convencionais de La Plata, Argentina e Alfredo Wagner, Brasil. Observou-se que os agricultores são conscientes com os problemas ambientais causados por suas atividades. Contudo, o agricultor não se sente protagonista sobre as possíveis mudanças em busca de uma agricultura sustentável.The actual environmental problem is strongly linked with agricultural activities, where familiar small agriculture performs great part of them. Under this context the aim of this paper was to know how small farmers think about environmental problem. With structured interviews based on five indicators, a field survey was done with conventional farmers from La Plata, Argentina, and Alfredo Wagner, Brazil. Farmers showed consciousness and preoccupation about environmental problems in their activities. However, in terms of personal responsibility the farmers did not show protagonist sense for possible changes in search for a more sustainable agriculture.Facultad de Ciencias Agrarias y Forestale

Solar activity and climate in Central America

Artículo científico -- Universidad de Costa Rica. Centro de Investigaciones Geofísicas, 2000Se analizaron los posibles efectos de la actividad solar en la temperatura superficial del aire y precipitación en Centro América. La correlación entre las series de manchas solares y las variables climáticas mencionadas es pobre. No obstante, se observó una tendencia creciente en los datos durante el periodo considerado. Usando el análisis de Fourier se encontraron picos de frecuencia aproximadamente a los 11 años y 5 años. Esto sugiere que la actividad solar puede ser un factor que afecta las variables climáticas.Possible effects of solar activity on the records of air surface temperature and rainfall in Central America are analysed. The correlation between the series of sunspot numbers, surface air temperature and precipitation, is poor. However an increasing tendency in the series is observed for the time period considered. Using Fourier analysis, frequency peaks were found close to 11 years and 5 years for both solar and climate data. This suggest that solar activity might be a factor which affects the climate’s variables.Universidad de Costa Rica, Centro de Investigaciones GeofísicasUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigaciones Geofísicas (CIGEFI

Data Privacy Vocabularies and Controls: Semantic Web for Transparency and Privacy

Managing Privacy and understanding the handling of personal data has turned into a fundamental right-at least for Europeans-since May 25th with the coming into force of the General Data Protection Regulation. Yet, whereas many different tools by different vendors promise companies to guarantee their compliance to GDPR in terms of consent management and keeping track of the personal data they handle in their processes, interoperability between such tools as well uniform user facing interfaces will be needed to enable true transparency, user-configurable and -manageable privacy policies and data portability (as also implicitly promised by GDPR). We argue that such interoperability can be enabled by agreed upon vocabularies and Linked Data

A Scalable Consent, Transparency and Compliance Architecture

In this demo we present the SPECIAL consent, transparency and compliance system. The objective of the system is to afford data subjects more control over personal data processing and sharing, while at the same time enabling data controllers and processors to comply with consent and transparency obligations mandated by the European General Data Protection Regulation. A short promotional video can be found at https://purl.com/specialprivacy/demos/ESWC2018

Manejo Integral de Agua y Suelo en Centroamérica. Bases científicas para el desarrollo rural comunitario.

Este libro recoge los frutos de la colaboración y trabajo conjunto de un grupo de Universidades Iberoamericanas entre 2007 y 2012 el marco de las actividades del Programa de Cooperación Comunidad, Agua y Bosque en Centroamérica (CAB Centroamérica, http://www2.caminos.upm.es/Departamentos/imt/Topografia/Cab/cab.html ). Las actividades se han realizado con el apoyo del Programa de Cooperación Universitaria PCI-AECID IBEROAMÉRICA, de la Dirección de Cooperación para el Desarrollo de la Universidad Politécnica de Madrid y de los fondos propios de las Universidades latinoamericanas, con especial mención a la Universidad de Costa Rica, coordinadora de los trabajos en Centroamérica. El inicio de esta colaboración se produjo en 2007 a partir de la identificación de un objetivo común: profundizar la investigación sobre la dinámica agua-suelo-planta para mejorar la producción y la calidad del agua de los sistemas de abastecimiento comunitarios en Centroamérica