241 research outputs found
ADVANTAGES OF ARTIFICIAL REPRODUCTION TECHNIQUES FOR WHITE-CLAWED CRAYFISH (AUSTROPOTAMOBIUS PALLIPES LEREBOULLET)
Bricks in the eclectic modernist architecture of the City of Zamora (Spain): an analysis of the types, building tools used and the construction of the walls
El presente trabajo lleva a cabo una investigación sobre los tipos de ladrillos empleados en las fachadas de los inmuebles de la época decimonónica de la capital zamorana. Este estudio engloba no sólo los ladrillos sino la relación de los mismos con los usos de los inmuebles. El análisis desarrollado es fundamentalmente técnico, centrándose tanto en los aspectos materiales y morfológicos de las piezas como en la relación existente entre los mismos y los diferentes sistemas constructivos empleados en la ejecución de sus muros.
La existencia de múltiple y variada documentación original, combinada con la información recabada in situ sobre los inmuebles que se conservan en la ciudad, ha permitido realizar un estudio exhaustivo y detallado, que se destaca como el objetivo primordial, pues permitirá desarrollar de cara a las futuras actuaciones de conservación, intervenciones para preservar y actuar sobre los elementos de interés.The present work studies the types of bricks used on the façades of the 19th century buildings of the City of Zamora. The study covers not only the bricks themselves but also their relationship with the use the buildings were put to. The analysis is essentially technical, focusing on both the material and morphological aspects of the bricks and the relationship between them and the different construction systems used to build the walls.
The existence of abundant and varied original literature, together with information collected “in situ” about the buildings preserved in the City, has allowed an exhaustive study that stands out as an initial aim since it will offer a way to guide future actions of conservation and interventions aimed at preserving the elements of interest
Comportamiento a fractura de aleaciones pulvimetalúrgicas de Cu-Al-Ni con efecto memoria de forma
Benchmarking a wide spectrum of metaheuristic techniques for the radio network design problem
The radio network design (RND) is an NP-hard optimization problem which consists of the maximization of the coverage of a given area while minimizing the base station deployment. Solving RND problems efficiently is relevant to many fields of application and has a direct impact in the engineering, telecommunication, scientific, and industrial areas. Numerous works can be found in the literature dealing with the RND problem, although they all suffer from the same shortfall: a noncomparable efficiency. Therefore, the aim of this paper is twofold: first, to offer a reliable RND comparison base reference in order to cover a wide algorithmic spectrum, and, second, to offer a comprehensible insight into accurate comparisons of efficiency, reliability, and swiftness of the different techniques applied to solve the RND problem. In order to achieve the first aim we propose a canonical RND problem formulation driven by two main directives: technology independence and a normalized comparison criterion. Following this, we have included an exhaustive behavior comparison between 14 different techniques. Finally, this paper indicates algorithmic trends and different patterns that can be observed through this analysis.Publicad
Isolation of Neisseria meningitidis strains with increase of penicillin minimal inhibitory concentrations
We report the isolation and characterization of ten strains showing an increase in the minimal inhibitory concentrations to penicillin (MICs > 0·1 μg/ml), and describe the epidemiological, clinical and microbiological features.
The susceptibility of 3432 meningococcal strains isolated from patients in the recent epidemic wave (1978–86) in Spain, to several antimicrobial agents used in the treatment and chemoprophylaxis of meningococcal infection has been tested. Most were resistant to sulphadiazine but sensitive to other antibiotics.
The possible existence of a new pattern of behaviour of meningococcal to penicillin is discussed
Revista de Vertebrados de la Estación Biológica de Doñaña
Comportamiento reproductor del camaleón común (Chamaeleo chamaeleon L.) en el sur de EspañaDistribución de los reptiles en la provincia de Granada (SE. Península Ibérica)Datos sobre la reproducción y el crecimientode Psammodromus hispanicus Fitzinger, 1826 en un medio adehesado de la España CentralVariación en la colocación y orientación del nido del Alzacola (Cercotrichas galactotes) en dos especies de árbolesOrganización de la comunidad de aves reproductora en las landas montanas del País Vasco AtlánticoEcología de una población ibérica de lobos (Canis Lupus)Etude biométrique des Crosidures (Soricidae, Insectivora) de la región de Massa (Souss, Maroe).Variación geográfica del género Eliomys en la Península IbéricaTendencias gregarias del Ciervo (Cervus elaphus) en Doñana.Data on the autumn diet of the red deer (Cervus elaphus L. 1758) in the Montes de Toledo (Central Spain)Nota sobre la coexistencia de Hyla arborea (L. 1758E Hyla meridionalis (Boettger 1874) rn rl Valle del TiétarCalendario reproductivo y tamaño de las puesta en el galápago leproso, Mauremys leprosa (Shweigger, 1812), en Doñana, HuelvaPelícola (Felicola) inaqualis Piager, 1880 (MALLOPHAGA:TRICHODECTIDAE) parásito deE Herpestes ichneumon L (CARNIVORA: HERPESTIDAE)Abundancia y amplitud de los desplazamientos de Apodemus sylvaticus en cuatro biotopos de Doñana que difieren en cobertura vegetalPeer reviewe
Performance of spanish white Macael marble exposed to narrow- and medium-range temperature cycling
Se aplican ciclos de estrés térmico de medio (100/-20 ºC
y 75/-20 ºC) y bajo (50/-20 ºC) rango sobre probetas de
mármol blanco de Macael (Almería, España), y se evalúa
ciclo a ciclo su incidencia mediante ultrasonidos. Los
resultados indican un considerable descenso de velocidad
de los ultrasonidos en las muestras sometidas a estrés de
100/-20 ºC, más moderado en el caso de 75/-20 ºC, poco
significativo en el caso de 50/-20 ºC. Las variaciones de
velocidad tienen lugar durante los primeros 5-7 ciclos,
permaneciendo los valores constantes en ciclos posteriores.
Los resultados proporcionados por medidas de dureza
de Schmidt, y de rotura por compresión uniaxial son
coincidentes con los proporcionados por los ultrasonidos.
Las imágenes de microscopía petrográfica y electrónica
(SEM) manifiestan una cierta descohesión granular en
zonas muy superficiales de las probetas sometidas a 40
ciclos de 100/-20 ºC. La coincidencia entre los datos por
las técnicas de rotura por compresión, medidas de dureza
superficial y ultrasonidos indican la validez de estas
dos últimas —técnicas no destructivas, NDT— en el control
de la incidencia de ciclos de stress térmico sobre las
características mecánicas de materiales pétreos.White marble specimens from Macael in the Spanish
province of Almeria were exposed to narrow- (50/
-20 ºC) and medium- (100/-20 ºC and 75/-20 ºC) range
thermal stress cycles. The effects were monitored with
ultrasound techniques. Ultrasound velocity declined
considerably in samples subjected to 100/-20 ºC cycles,
more moderately when the range was 75/-20 ºC and
insignificantly when it was narrowed to 50/-20 ºC. All
variations were recorded in the first five to seven
cycles, with values flattening thereafter. The Schmidt
hardness and compression test results concurred with
the ultrasound findings. Petrographic and scanning
electron microscope (SEM) imaging revealed some very
superficial granular decohesion in the specimens
subjected to forty 100/-20 ºC cycles. The concurrent
results from compression testing on the one hand and
surface hardness and ultrasound measurements on the
other confirmed the validity of the latter two nondestructive
techniques (NDT) for determining the
effects of thermal stress cycling on stone mechanical
strength.La investigación presentada en este artículo es parte del Proyecto
MAT 2004-06804-CO2-0 del Plan Nacional de Investigación
científica, Desarrollo e Innovación Tecnológica (Ministerio
de Ciencia y Tecnología) y llevado a cabo en el Grupo
de Investigación RNM 0179 de la Junta de Andalucía
Social sciences research in neglected tropical diseases 2: A bibliographic analysis
The official published version of the article can be found at the link below.Background
There are strong arguments for social science and interdisciplinary research in the neglected tropical diseases. These diseases represent a rich and dynamic interplay between vector, host, and pathogen which occurs within social, physical and biological contexts. The overwhelming sense, however, is that neglected tropical diseases research is a biomedical endeavour largely excluding the social sciences. The purpose of this review is to provide a baseline for discussing the quantum and nature of the science that is being conducted, and the extent to which the social sciences are a part of that.
Methods
A bibliographic analysis was conducted of neglected tropical diseases related research papers published over the past 10 years in biomedical and social sciences. The analysis had textual and bibliometric facets, and focussed on chikungunya, dengue, visceral leishmaniasis, and onchocerciasis.
Results
There is substantial variation in the number of publications associated with each disease. The proportion of the research that is social science based appears remarkably consistent (<4%). A textual analysis, however, reveals a degree of misclassification by the abstracting service where a surprising proportion of the "social sciences" research was pure clinical research. Much of the social sciences research also tends to be "hand maiden" research focused on the implementation of biomedical solutions.
Conclusion
There is little evidence that scientists pay any attention to the complex social, cultural, biological, and environmental dynamic involved in human pathogenesis. There is little investigator driven social science and a poor presence of interdisciplinary science. The research needs more sophisticated funders and priority setters who are not beguiled by uncritical biomedical promises
Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)
This is the author's accepted manuscript. The final publication is available at Springer via http://dx.doi.org/10.1007/s10933-009-9387-7.We present the Holocene sequence from Lago Enol (43°16′N, 4°59′W, 1,070 m a.s.l.), Cantabrian Mountains, northern Spain. A multiproxy analysis provided comprehensive information about regional humidity and temperature changes. The analysis included sedimentological descriptions, physical properties, organic carbon and carbonate content, mineralogy and geochemical composition together with biological proxies including diatom and ostracod assemblages. A detailed pollen study enabled reconstruction of variations in vegetation cover, which were interpreted in the context of climate changes and human impact. Four distinct stages were recognized for the last 13,500 years: (1) a cold and dry episode that includes the Younger Dryas event (13,500–11,600 cal. year BP); (2) a humid and warmer period characterizing the onset of the Holocene (11,600–8,700 cal. year BP); (3) a tendency toward a drier climate during the middle Holocene (8,700–4,650 cal. year BP); and (4) a return to humid conditions following landscape modification by human activity (pastoral activities, deforestation) in the late Holocene (4,650–2,200 cal. year BP). Superimposed on relatively stable landscape conditions (e.g. maintenance of well established forests), the typical environmental variability of the southern European region is observed at this site.The Spanish Inter-Ministry Commission of Science and
Technology (CICYT), the
Spanish National Parks agency, the European Commission, the
Spanish Ministry of Science, and the European
Social Fund
- …