Alejandra Ciriza; Estela Fernández; Daniel Prieto y Francisco Gutiérrez. El discurso pedagógico. San José, Costa Rica, Radio Nederland; Universidades de San Carlos de Guatemala y Rafael Landívar, 1992, 157 p.

Fil: Follari, Roberto. Universidad Nacional de Cuyo. Facultad de Ciencias Políticas y Sociales

Radio Nacional Mendoza como medio estatal y difusor de la cultura local

El desarrollo de este trabajo se plantea con cinco capítulos, en los cuales se abordan aspectos de Radio Nacional Mendoza en relación con la cultura local. El capítulo 1 tratará a Radio Nacional Mendoza en sus aspectos superficiales, aquellos que permiten el primer contacto con el medio, por lo tanto, qué información es más accesible y cómo influye esto en la relación con la comunidad cercana a la radio. En el segundo capítulo el aspecto elegido es el discurso y la construcción simbólica, que se difunde y propone el medio, cómo se entiende la comunicación, a quién se dirige el mensaje y de qué manera. El capitulo 3 se enfoca en la nueva ley de medios audiovisuales y su influencia en Radio Nacional Mendoza, la evaluación de los conceptos de público y estatal, una definición de estado y diferencias entre el funcionamiento de los medios de comunicación privados y sin fines de lucro. En cuarto lugar se analiza a Radio Nacional Mendoza como un espacio de poder en disputa, ¿Cómo es la relación del público con lo público? ¿Los medios del estado son medios del gobierno? ¿Tienen poder los medios de comunicación, cómo lo ejercen? Son algunas de las preguntas disparadoras, en relación con el poder y la disputa por él. En el último capítulo se ofrece lo relevado (entrevistas, bibliografía, recorrido del espacio físico del medio, etc.) y los aportes que se proponen, en pos de un medio público mucho más comprometido, con la comunidad que la contiene, y en este sentido con la difusión de la cultura local.  

Transformar las ondas de radio: información segura sobre aborto seguro, Brasil

O presente relatório tem como objetivo apresentar os resultados finais do projeto “Transformar as ondas do rádio: informações seguras sobre aborto inseguro”. O projeto foi executado pelo Grupo Curumim e teve como objetivos: Fomentar entre as mulheres jovens um debate acerca do impacto da ilegalidade do aborto na saúde e vida das mulheres e na efetivação de direitos e políticas públicas relacionadas aos direitos sexuais e direitos reprodutivos; Produzir spots de rádio sobre aborto e os serviços de atendimento ao aborto legal; Articular comunicadores/as populares e divulgar informações sobre o aborto e os serviços de atendimento ao abortamento legal

Radio-echo sounding investigation of the western Dronning Maud Land and north-eastern Coats Land, East Antarctica (Scale 1:2 500 000)

During two Antarctic field seasons, western Dronning Maud Land and eastern Coats Land were covered by airborne radio-echo sounding surveys, conducted in combination with magnetic and gravity measurements along the 50 NW-SE-directed tracks, totaling about 11200 km and spaced 20 km apart. The data were collected in analogue form and then processed to compile ice surface, ice thickness and bedrock topography maps in I : 2 500 000 scale which gave a new and/or more detailed information on the region than previous compilations. The maps show that western Dronning Maud Land is dominated by a large mountainous area with altitudes up to 2800 m including rock outcrops of Annandagstoppane, Borgmassivet, Kirwanveggen and Heimefrontfjella. Upland terrains of Vestfjella and Mannefallknausane have an isolated position and are surrounded by a plain with bedrock depressions of 600 m deep below sea level. A narrow strip of north-eastern Coats Land studied by radio-echo soundings exhibits a smooth subice relief with altitudes close to sea level. The structural style of bedrock topography was mostly determined by extensional tectonics.

Characterization of the dose distribution in the halo region of a clinical proton pencil beam using emulsion film detectors

Proton therapy is a high precision technique in cancer radiation therapy which allows irradiating the tumor with minimal damage to the surrounding healthy tissues. Pencil beam scanning is the most advanced dose distribution technique and it is based on a variable energy beam of a few millimeters FWHM which is moved to cover the target volume. Due to spurious effects of the accelerator, of dose distribution system and to the unavoidable scattering inside the patient's body, the pencil beam is surrounded by a halo that produces a peripheral dose. To assess this issue, nuclear emulsion films interleaved with tissue equivalent material were used for the first time to characterize the beam in the halo region and to experimentally evaluate the corresponding dose. The high-precision tracking performance of the emulsion films allowed studying the angular distribution of the protons in the halo. Measurements with this technique were performed on the clinical beam of the Gantry1 at the Paul Scherrer Institute. Proton tracks were identified in the emulsion films and the track density was studied at several depths. The corresponding dose was assessed by Monte Carlo simulations and the dose profile was obtained as a function of the distance from the center of the beam spot.

Emulsion detectors for the antihydrogen detection in AEgIS

The AEgIS experiment at CERN aims to perform the first direct measurement of gravitational interaction between matter and antimatter by measuring the deviation of a cold antihydrogen beam in the Earth gravitational field. The design of the experiment has been recently updated to include emulsion films as position sensitive detector. The submicrometric position accuracy of emulsions leads indeed to a significant improvement of the experimental sensitivity. We present results of preliminary tests and discuss perspectives for the final measurement.

Low current performance of the Bern medical cyclotron down to the pA range

A medical cyclotron accelerating H- ions to 18 MeV is in operation at the Bern University Hospital (Inselspital). It is the commercial IBA 18/18 cyclotron equipped with a specifically conceived 6 m long external beam line ending in a separate bunker. This feature is unique for a hospital-based facility and makes it possible to conduct routine radioisotope production for PET diagnostics in parallel with multidisciplinary research activities, among which are novel particle detectors, radiation biophysics, radioprotection, radiochemistry and radiopharmacy developments. Several of these activities, such as radiobiology experiments for example, require low current beams down to the pA range, while medical cyclotrons are designed for high current operation above 10 μA. In this paper, we present the first results on the low current performance of a PET medical cyclotron obtained by ion source, radio-frequency and main coil tuning. With this method, stable beam currents down to (1.5+/- 0.5 ) pA were obtained and measured with a high-sensitivity Faraday cup located at the end of the beam transport line.