Suchergebnisse

Incompleta estuvo la gran familia iberoamericana cuando se reunio, a mediados de julio 1991, en la ciudad mexicana de Guadalajara, para examinar en forma conjunta y por vez primera en la historia los grandes retos del mundo actual. Falto, en ese encuentro historico, un representante de Puerto Rico independiente. Despues de cuatro siglos de vasallaje europeo y casi un siglo de ocupacion militar norteamericana, el presidente de Estados Unidos no desmaya en sus propositos de convertir a Puerto Rico en el estado 51 de la Union

Desde el siglo pasado, Estados Unidos ha lanzado sus tropas en America Latina en 225 ocasiones. La invasion y ocupacion de Panama reclama una vez mas una reflexion por parte de los paises latinoamericanos

No contentos con Radio Marti, Estados Unidos se apresta a lanzar trasmisiones de television mediante Tele-Marti, un proyecto que viola todas las regulaciones internacionales de telecomunicaciones, entre ellas el articulo 12 de la Junta Internacional de Registros de Frecuencias

Estudiamos algunas consecuencias sociales que para los guanches supuso el proceso de desarticulación de su orden político y la imposición de nuevas estructuras sociales, políticas, económicas y culturales. Para ello se ha realizado, en primer lugar, una identificación de los grupos que, dentro de esta comunidad, tenían una diferente ubicación en el panorama de la nueva sociedad; en segundo lugar reflexionamos sobre el carácter de las relaciones entre los mismos, aportando ejemplos individuales. Para ilustrar los modelos grupales propuestos y las relaciones entre ellos se han utilizado ejemplos individuales y colectivos de la Comarca de Anaga. Como fuente principal se ha empleando documentación escrita emitida en la isla entre el final de la Conquista (1496) y el término del primer período de gobierno (1526). ; We study in this paper some of the social consecuences that the break of the political order and the imposition of new political, economic and cultural structures were brought to the island with the Conquest. First of all, we have done an identification of different social guanches groups in the new postconquest scene. Second, we make a reflexion about the caracter of relations between them; from this circumstance we propose a dynamic model, bringing individual and social examples from Anaga region. We have taken as the principal resource mostly writen documentation produced in the island between the end of the Conquest (1496) and the end of the first period of goverment (1526).

We construct the exponential map associated to a nonholonomic system that allows us to define an exact discrete nonholonomic constraint submanifold. We reproduce the continuous nonholonomic flow as a discrete flow on this discrete constraint submanifold deriving an exact discrete version of the nonholonomic equations. Finally, we derive a general family of nonholonomic integrators that includes as a particular case the exact discrete nonholonomic trajectory ; D. Martín de Diego and A. Simoes acknowledge financial support from the Spanish Ministry of Science and Innovation, under grants PID2019-106715GB-C21, MTM2016-76702-P, and from the Spanish National Research Council, through the "Ayuda extraordinaria a Centros de Excelencia Severo Ochoa" R&D (CEX2019-000904-S). A. Simoes is supported by the FCT research fellowship SFRH/BD/129882/2017 partially funded by the European Union (ESF). J.C. Marrero acknowledges the partial support by European Union (Feder) grant MTM 2015-64166-C2-2P and PGC2018-098265-B-C32.

Nonholonomic mechanics describes the motion of systems constrained by nonintegrable constraints. One of its most remarkable properties is that the derivation of the nonholonomic equations is not variational in nature. However, in this paper, we prove (Theorem 1.1) that for kinetic nonholonomic systems, the solutions starting from a fixed point q are true geodesics for a family of Riemannian metrics on the image submanifold Mnh q of the nonholonomic exponential map. This implies a surprising result: the kinetic nonholonomic trajectories with starting point q, for sufficiently small times, minimize length in Mnhq! ; D. Martín de Diego and A. Anahory Simoes acknowledge financial support from the Spanish Ministry of Science and Innovation, under grants PID2019-106715GB-C21 and ?Severo OchoaProgramme for Centres of Excellence in R&D? (CEX2019-000904-S). A. Anahory Simoes is supported by the FCT (Portugal) research fellowship SFRH/BD/129882/2017 partially funded by the European Union (ESF). J.C. Marrero acknowledges the partial support by European Union (Feder) grant PGC2018-098265-B-C32.

We are proposing Tulczyjew¿s triple for contact dynamics. The most important ingredients of the triple, namely symplectic diffeomorphisms, special symplectic manifolds, and Morse families, are generalized to the contact framework. These geometries permit us to determine so-called generating family (obtained by merging a special contact manifold and a Morse family) for a Legendrian submanifold. Contact Hamiltonian and Lagrangian Dynamics are recast as Legendrian submanifolds of the tangent contact manifold. In this picture, the Legendre transformation is determined to be a passage between two different generators of the same Legendrian submanifold. A variant of contact Tulczyjew¿s triple is constructed for evolution contact dynamics. ; M. de León and M. Lainz acknowledge the partial finantial support from MICINN Grant PID2019-106715GB-C21 and the ICMAT Severo Ochoa project CEX2019-000904-S. M. Lainz wishes to thank MICINN and ICMAT for a FPI-Severo Ochoa predoctoral contract PRE2018-083203. J.C. Marrero acknowledges the partial support from European Union (Feder) grant PGC2018-098265-B-C32.

Communication is a decisive factor in the functioning of the territories, as it enables synergies among the state, society and the university, as the most important socio-cultural center in this context for the empowerment of local actors as agents of development. Thus, the objective of this article is to design an institutional communication management strategy for the University of Pinar del Río in function of the local development of the province for the strengthening of institutional and communicative capacities, as well as the improvement of the quality of social services. To accomplish it, methods such as documentary analysis, analysis and synthesis, structural systemic, group interview and participant observation were used. As a result of its application, the needs of institutional communication management at the University of Pinar del Río "Hermanos Saíz Montes de Oca" and its articulation with local development in the province were identified, which served as a basis for the elaboration of the strategy for institutional communication management at the University of Pinar del Río "Hermanos Saíz Montes de Oca", as a function of local development. The strategy articulates the participation of internal and external audiences of the University of Pinar del Río in the management of institutional communication, in terms of local development, which places the institution in a position to meet social and governmental demands related to local development, from institutional communication. ; La comunicación es un factor decisivo en el funcionamiento de los territorios, en tanto posibilita las sinergias entre el estado, la sociedad y la universidad, como centro sociocultural más importante en este contexto para el empoderamiento de los actores locales como agentes del desarrollo. Así que el objetivo de este artículo es diseñar una estrategia de gestión de la comunicación institucional de la Universidad de Pinar del Río en función del desarrollo local de la provincia para el fortalecimiento de capacidades ...

This paper provides early instrumental data recovered for 20 countries of Latin-America and the Caribbean (Argentina, Bahamas, Belize, Brazil, British Guiana, Chile, Colombia, Costa Rica, Cuba, Ecuador, France (Martinique and Guadalupe), Guatemala, Jamaica, Mexico, Nicaragua, Panama, Peru, Puerto Rico, El Salvador and Suriname) during the 18th and 19th centuries. The main meteorological variables retrieved were air temperature, atmospheric pressure, and precipitation, but other variables, such as humidity, wind direction, and state of the sky were retrieved when possible. In total, more than 300,000 early instrumental data were rescued (96% with daily resolution). Especial effort was made to document all the available metadata in order to allow further post-processing. The compilation is far from being exhaustive, but the dataset will contribute to a better understanding of climate variability in the region, and to enlarging the period of overlap between instrumental data and natural/documentary proxies. ; This work was partially supported by the PROMETEO research projects financed by the Secretariat of Higher Learning, Science, Technology and Innovation (Ecuador Government), AYA2014-57556-P and CGL2014-52135-C3-1-R financed by the Spanish Ministry of Economy and Competitiveness, IB16127 and grant GR15137 financed by the Economy and Infrastructure Counselling of the Junta of Extremadura (the latter co-financed by the European Regional Development Fund), and IMDROFLOOD financed by the Water Works 2014 co-funded call of the European Commission. ; Peer reviewed