Atmospheric electrical field measurements near a fresh water reservoir and the formation of the lake breeze

In order to access the effect of the lakes in the atmospheric electrical field, measurements have been carried out near a large man-made lake in southern Portugal, the Alqueva reservoir, during the ALqueva hydro-meteorological EXperiment 2014. The purpose of these conjoint experiments was to study the impact of the Alqueva reservoir on the atmosphere, in particular on the local atmospheric electric environment by comparing measurements taken in the proximity of the lake. Two stations 10 km apart were used, as they were located up- and down-wind of the lake (Amieira and Parque Solar, respectively), in reference to the dominant northwestern wind direction. The up-wind station shows lower atmospheric electric potential gradient (PG) values than the ones observed in the down-wind station between 12 and 20 UTC. The difference in the atmospheric electric PG between the up-wind and the down-wind station is ~30 V/m during the day. This differential occurs mainly during the development of a lake breeze, between 10 and 18 UTC, as a consequence of the surface temperature gradient between the surrounding land and the lake water. In the analysis presented, a correlation is found between the atmospheric electric PG differences and both wind speed and temperature gradients over the lake, thus supporting the influence of the lake breeze over the observed PG variation in the two stations. Two hypotheses are provided to explain this observation: (1) The air that flows from the lake into the land station is likely to increase the local electric conductivity through the removal of ground dust and the transport of cleaner air from higher altitudes with significant light ion concentrations. With such an increase in conductivity, it is expected to see a reduction of the atmospheric electric PG; (2) the resulting air flow over the land station carries negative ions formed by wave splashing in the lake's water surface, as a result of the so-called balloelectric effect. These negative ions will form a space-charge density (SCD) that can reduce the atmospheric electric PG. A formulation is derived here in order to estimate the local SCD.

Profissionais de saúde VS formação contínua: nas tecnologias da saúde

O presente trabalho tem por objectivo descobrir as estratégias utilizadas pelos Técnicos de Diagnóstico e Terapêutica Coordenadores das áreas das Tecnologias da Saúde, na avaliação da gestão da formação contínua dos colegas que coordenam. O estudo é qualitativo e enquadra-se numa metodologia de estilo etnográfico exploratório, que tem por finalidade, aprofundar e descrever as estratégias utilizadas para a avaliação da gestão da formação contínua dos Técnicos de Diagnóstico e Terapêutica. Os dados foram obtidos através de entrevistas aos Técnicos de Diagnóstico e Terapêutica Coordenadores de um hospital de Portugal continental. Os resultados revelaram que os Técnicos de Diagnóstico e Terapêutica Coordenadores não aplicam estratégias para avaliação da gestão da formação contínua dos colegas que coordenam, e ainda, constatou-se a falta de informação sobre o processo de gestão da formação contínua. Os resultados obtidos evidenciaram lacunas relativamente às estratégias de avaliação da gestão da formação contínua dos Técnicos de Diagnóstico e Terapêutica, para as quais sugerirmos um modelo e algumas medidas de intervenção que vão de encontro à problemática aflorada no presente trabalho. ABSTRACT; The purpose of this work is to discover the strategies used by the Technicians of Diagnosis and Therapy, coordinators of the areas of Health Technologies, in the evaluation of management of continuous formation of the colleagues they coordinated. The study is qualitative and fits an ethnographic exploratory stylized methodology, its purpose based on developing and describing the strategies used to evaluate the management of the continuous formation of the Technicians of Diagnosis and Therapy. The data was obtained through several interviews to the Technicians of Diagnosis and Therapy coordinators of and hospital of the Continent of Portugal. The results revealed that the Technicians of Diagnosis and Therapy do not enforce strategies for the evaluation of management of continuous formation of the colleagues they coordinated; furthermore, it was made evident the lack of information about the process of the management of continuous formation. The data obtained revealed gaps concerning the strategies of the management of the continuous formation of the Technicians of Diagnosis and Therapy, to which we suggest a model and some measures of intervention which will meet the problematic explained in this work.