Search results for "ambiente"
showing 10 items of 1727 documents
Boletín ONUBIB: Junio 2016
2016
Recurso electrónico. Publicación trimestral de novedades bibliográficas, de acceso libre y texto completo, de publicaciones de la ONU y de sus Organismos Especializados.
Boletín ONUBIB: Marzo 2019
2019
Recurso electrónico. Publicación trimestral de novedades bibliográficas de acceso libre y a texto completo de publicaciones de la ONU y de sus Organismos Especializados.
Boletín ONUBIB: 1/2019
Recurso electrónico. Publicación trimestral de novedades bibliográficas de acceso libre y texto completo, de publicaciones de la ONU y de sus Organismos Especializados. Electronic resource. Quarterly publication of bibliographic novelties of free access and complete text of publications of the UN and its Specialized Organizations.
La muntanya de L'Aixavegó: Un caso histórico de deslizamiento de grandes proporciones en la Ribera
1981
Comparison of different methods for extraction of polycyclic aromatic hydrocarbons (PAHs) from Sicilian (Italy) coastal area sediments.
2012
This paper describes a work aimed at improving the conditions of an extraction method, coupling GC-MS determination, for the analysis without cleanup phase, of polycyclic aromatic hydrocarbons (PAHs) from sediment samples. The automatic Soxhlet extraction in warm mode (using Extraction System B-811 Standard, Buchi) has demonstrated advantages for automation, reduced extraction time, and lower solvent use than for conventional Soxhlet extraction. Under these conditions, the recoveries are very good as they resulted greater than 85 % and, in most of the cases, near 100 %. The repeatability is also satisfactory (relative standard deviation less than 15 %). The detection limits are also accepta…
Vanadium and molybdenum concentrations in particulate from Palermo (Italy): analytical methods using voltammetry
2014
The main purpose of this work was to develop a reliable method for the determination of vanadium (V) and molybdenum (Mo) in atmosphere particles or aerosols because they can not be readily measured using conventional techniques. For this research, 30 particulate samples were collected from five different stations located at Palermo, Italy. We used the catalytic adsorptive stripping voltammetry and differential pulsed voltammetry to measure Vand Mo in atmospheric particulate, respectively. The represented method includes advantages of high sensitivity, high selectivity, simplicity, reproducibility, speed and low costs. The quantification limits for V and Mo are, respectively, 0.57 and 0.80 n…
Indagini Scientifiche
2019
In questo contributo sono riportati i risultati della campagna diagnostica effettuata sul dipinto murale “Atelier“, opera giovanile di Antonio Sanfilippo (1923-1980), ritrovato sotto una scialbatura che, sebbene lo abbia nascosto, allo stesso tempo lo ha preservato.
Il Progetto ATENA: Applicazione di metodologie innovative per la conservazione di manufatti metallici e ceramici da scavo archeologico e per il recup…
2007
Qui di seguito viene illustrato il progetto scientifico ATENA, svolto presso l'Istituto per lo Studio dei Materiali Nanostrutturati (ISMN) del Consiglio Nazionale delle Ricerche (CNR) e co-finanziato dal MIUR con Decreto Direttoriale 9-10-2002, n. 1105/2002. Il progetto si propone di applicare avanzate tecniche diagnostiche strumentali al fine di acquisire la dettagliata conoscenza microchimica e microstrutturale di manufatti metallici e ceramici antichi, di definirne il meccanismo di alterazione e/o degrado e di progettare, sintetizzare e validare opportuni prodotti e formulazioni per il restauro conservativo di tali manufatti. Le conoscenze acquisite sono utilizzabili anche per il recuper…
Caracterización de las áreas urbanas gallegas en función de los flujos de movilidad obligada
2010
La realidad territorial en los municipios gallegos evolucionó a ritmos dispares, afectados por dinámicas muy diferentes en cada uno de los casos. Los problemas en la aplicación de la normativa urbanística y de los instrumentos técnicos para la gestión del suelo gestaron unos ámbitos urbanos desconectados de su realidad metropolitana. Las áreas de influencia en las ciudades de Galicia presentan modelos complejos, adaptados a las dificultades que les privaron de una gestión prudente y coherente de los nuevos territorios urbanos. En la evaluación de la nueva realidad urbana, de sus condiciones y características, la movilidad residencial y la recurrente diaria es un elemento de primer rango de …
Demographic growth, agricultural policy and environmental protection in the African sub-Sahara region
1998
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