La hoja de coca: simbología, comercio y persecución

págs. 79-92. Revista Rábida, nº 27 (Huelva, 2008)

Modular Planar Antenna at X-band for satellite communications

An antenna which has been conceived as a portable system for satellite communications based on the recommendations ITU-R S.580-6 [1] and ITU-R S.465-5 [2] for small antennas, i.e., with a diameter lower than 50 wavelengths, is introduced. It is a planar and a compact structure with a size of 40×40×2 cm. The antenna is formed by an array of 256 printed elements covering a large bandwidth (14.7%) at X-Band. The specification includes transmission (Tx) and reception (Rx) bands simultaneously. The printed antenna has a radiation pattern with a 3dB beamwidth of 5°, over a 31dBi gain, and a dual and an interchangeable circular polarizatio

Portable low profile antenna at X-band

An antenna which has been conceived as a portable system for satellite communications based on the recommendations ITU-R S.580-6 and ITU-R S.465-5 for small antennas, i.e., with a diameter lower than 50 wavelengths, is introduced. It is a planar and a compact structure with a size of 40×40×2 cm. The antenna is formed by an array of 256 printed elements covering a large bandwidth (14.7%) at X-Band with a VSWR of 1.4:1. The specification includes transmission (Tx) and reception (Rx) bands simultaneously. The printed antenna has a radiation pattern with a 3dB beamwidth of 5°, over a 31dBi gain, and a dual and an interchangeable circular polarization

Caracterización de una lente zurda plana para la excitación de antenas planas de ranuras

“Metamaterials” are artificially engineered structured materials exhibiting novel properties due to their special architecture and not because of the constituent homogeneous materials used to manufacture them. This enables to design new materials with characteristics not available in conventional materials, as a negative refractive index. A new form of excitation for parallel plate slot antennas based in a planar “left handed” lens is proposed in [1]. This excitation allows enhancing the efficiency of these kinds of antennas. The lens is constructed using the well known “mushroom” structure. Here the characterization of the left handed lens with the mushroom structure in terms of their geometrical parameters (lattice constant, diameter of via, height of substrate) is presented using the dispersion diagram of the unit cell. Some simulations results are shown

Sanín Cano y España: antiimperialismo, americanismo y las tesituras de un congreso frustrado

Baldomero Sanín Cano is considered one of the main representatives of Contemporary Latin American thinking. Sanín was a prolific writer whose works influenced different fields of essay-writing, journalism, education, politics, and literary criticism. This paper seeks to analyse the ideology of an author who was an advocate of Latin American integration, through his constant opposition to American expansionism in the press. Based on an exploration of his personality, training and political experience, the paper discusses the manifestation of his anti-imperialism in the Spanish media and, in particular, during his time as foreign correspondent in Madrid (1922-1924) for the Argentine newspaper La Nación. It concludes with an analysis of the impact of his proposal to organize an Ibero-American congress in order to form a united front against the Genoa Conference resolutions.Baldomero Sanín Cano es, sin lugar a dudas, uno de los eruditos más relevantes de la intelectualidad latinoamericana contemporánea. Sus múltiples inquietudes hicieron que dejase una huella transversal en campos tan diversos como el ensayo, el periodismo, la crítica literaria, la educación o la política. Este artículo indaga en el ámbito ideológico del autor y, más concretamente, en su vertiente unionista continental, manifiesta en sus constantes críticas al expansionismo estadounidense. Partiendo de una prospectiva sobre la personalidad, formación y experiencia política de Sanín, el trabajo incide en lo que fue la manifestación de su antiimperialismo militante dentro de los medios españoles y, en particular, durante su corresponsalía en Madrid, de 1922 y 1924, para el diario argentino La Nación. Finalmente pasaremos a analizar el impacto que tuvo su propuesta para celebrar un congreso iberoamericano con el que aunar posturas frente a las resoluciones de la Conferencia de Génova

Los corresponsales extranjeros de la revista Rábida

págs. 213-226Capítulo incluido en el libro: Actas de las Jornadas de Historia sobre el Descubrimiento de América. Tomo III: Jornadas VII, VIII, IX y X, 2011, 2012, 2013 y 2014. Eduardo García Cruzado (Coordinación). Sevilla: Universidad Internacional de Andalucía, 2015. ISBN: 978-84-7993-263-3. Enlace: http://hdl.handle.net/10334/363

From prejudice to exclusion: reflections on the origins of racial marginalization in latin america.

El racismo ha sido un elemento tradicionalmente decisivo en la legitimación de las exclusiones. Su condición de resorte de dominación social, cultural y económica ha permitido presentar las desigualdades del Otro como realidades inamovibles, cuando no inevitables, por natura. Ha sido así como se han consagrado dogmas discriminatorios de difícil rectificación en distintos tiempos y territorios – en distintas sociedades – a lo largo de la Historia. Sobre tales dogmas y su incidencia en el imaginario latinoamericano es que versará este artículo. Para ello nos hemos valido de la obra de aquellos autores y personalidades que, por sus actos o trascendencia, más relevantes han resultado en la conformación de este ideario o en la oposición al mismo.Racism has traditionally been decisive when legitimating exclusions. Its condition of social, cultural and economic way of domination has allowed presenting Other's inequalities as immovable realities, though not unavoidable, per natura. This has been the way in which discriminatory dogmas has been established in different times and places - in different societies - throughout history. This article is about those dogmas and its impact in the Latin American imagery. This article is based on the work of those authors and personalities who, by means of their relevant acts or transcendence, have resulted in the conformation of this imagery or its opposition.Departamento de Historia II y Geografí

De la «Patria Grande» a la «Madre Patria»: Manuel Ugarte y el hispanoamericanismo español (1900-1930)

This paper aims to examine the role of a key figure in Latin-American anti-imperialism, Manuel Baldomero Ugarte, through his collaboration with early 20th century Hispano-Americanism. Based on an analysis of the marginalization this intellectual suffered and his decade- spanning works, the study focuses on his contributions to three of the main pro-Hispano- American journals of the time –La Rábida, Unión Ibero-Americana and Cultura Hispanoamericana– so as to observe the of confluence between this movement and the erudite Argentinean.El objetivo de este artículo es la revisión de una figura capital en el antiimperialismo latinoamericano, Manuel Baldomero Ugarte, a través de sus colaboraciones con el hispanoamericanismo de comienzos del XX. Partiendo de un análisis sobre la marginación sufrida por el intelectual y su obra durante décadas, centraremos el trabajo en sus aportes a tres de las principales revistas hispanoamericanistas de la época –La Rábida, Unión Ibero-Americana y Cultura Hispanoamericana– a fin de observar los puntos de confluencia entre este movimiento y el erudito argentino

La conformación de un icono genérico y su contexto: Augusto César Sandino y la opinión pública española (1928-1934)

The objective of this article is the revision of the figure of Augusto César Sandino and its sociopolitical impact on the Spanish public opinion. Starting from an analysis of the events that drove the figure of the guerrilla leader to the international arena, we will examine the impact of his actions within an interventionist moment as posed by the United States in Central America and the Caribbean in the first decades of the Twentieth century, as well as the reaction of the Spanish-speaking countries regarding the interference of Washington. It will be from the above mentioned context that the repercussion of Sandino on the intellectuality and peninsular media will be addressed, taking as reference the newspapers of the entire ideological arch to confirm how, even from different perspectives - and within a timeframe of just seven years – the Nicaraguan would eventually become a shared icon, but of dissimilar significance.; El objetivo de este artículo es la revisión de la figura de Augusto César Sandino y su impacto sociopolítico en la opinión pública española. Partiendo de un análisis de los acontecimientos que impulsaron la figura del líder guerrillero a la escena internacional, examinaremos la repercusión de sus actuaciones dentro de una coyuntura intervencionista como la planteada por los Estados Unidos en Centroamérica y el Caribe en las primeras décadas del XX, al igual que la reacción de los países hispanohablantes respecto a las injerencias de Washington. Será a partir de dicho contexto que abordaremos la repercusión de Sandino en la intelectualidad y medios peninsulares, tomando como referencia diarios de todo el arco ideológico para confirmar cómo, aun desde perspectivas diferenciadas – y en un marco temporal de apenas siete años – el nicaragüense acabaría convertido en un icono compartido, pero de disímil significación