Search results for "49"

Do cold-water corals spatially correlate with submarine canyons in the Bay of Biscay? : A GIS study analysing the spatial distribution of cold-water …

2020

Master's thesis in Coastal ecology (BIO501) The seascape of the Bay of Biscay is a mysterious place. It is located to the west of France and the north of Spainand is often defined as well-differentiated geomorphological unit. The continental margin of the BoB is incised with many submarine canyons and is also thought to be a hotspot for cold-water corals.Unfortunately, it is an area under high anthropogenic pressure where intense fishing activity, bottom trawling especially, is causing major disturbances to benthic habitats such as cold-water corals. Cold-water corals have been well studied along the European margin and have more frequently been recorded in the northeastAtlantic than any ot…

Optimización de las propiedades de emulsión de betún para la estabilización de balasto

2017

Ballasted track, while providing economical and practical advantages, is associated with high costs and material consumption due to frequent maintenance. More sustainable alternatives to conventional ballasted trackbeds should therefore aim at extending its durability, particularly considering ongoing increases in traffic speed and loads. In this regard, the authors have investigated a solution consisting of bitumen stabilised ballast (BSB), designed to be used for new trackbeds as well as in reinforcing existing ones. This study presents the idea behind the technology and then focuses on a specific part of its development: the optimisation of bitumen emulsion properties and dosage in relat…

The biocenotic value of Slitere National Park, Latvia, with special reference to inter-dune mires

2019

Inter-dune wetlands in Europe harbour many Red List species because they are very nutrient-poor ecosystems. Most of these wetlands are geologically very young and no or little peat formation has occurred. In Slītere National Park the numerous inter-dune wetlands are relatively old, up to 4500 years old, and most mire communities are peat forming and they are well preserved. However, the hydrological systems that have conserved the mires are largely unknown. In the present study we analysed 128 vegetation relevées of dune mires in order to assess the variation in ecological mire types. We also carried out several short-time studies to get an insight into the peat development and hydrological…

Chemical composition of modern and fossil hippopotamid teeth and implications for paleoenvironmental reconstructions and enamel formation – Part 2: A…

2012

Abstract. For reconstructing environmental change in terrestrial realms the geochemistry of fossil bioapatite in bones and teeth is among the most promising applications. This study demonstrates that alkaline earth elements in enamel of Hippopotamids, in particular Ba and Sr are tracers for water provenance and hydrochemistry. The studied specimens are molar teeth from Hippopotamids found in modern and fossil lacustrine settings of the Western Branch of the East African Rift system (Lake Kikorongo, Lake Albert, and Lake Malawi) and from modern fluvial environments of the Nile River. Concentrations in enamel vary by ca. two orders of magnitude for Ba (120–9336 μg g−1) as well as for Sr (9–21…

Breve relacion de la vida del ... Señor Cardenal Fr. Vicente Maria Orsini, del Orden de Predicadores, desde su nacimiento, hasta su exaltacion à la…

1724

P. orlades Esc. calc. papal de Benet XIII entre les línies del tít. caplletra ornada, vinyeta Text a 1 col. - Reclams

Breve relacion de la vida del ... Señor Cardenal Fr. Vicente Maria Orsini, del Orden de Predicadores, desde su nacimiento, hasta su exaltacion à la S…

P. orlades Esc. calc. papal de Benet XIII entre les línies del tít caplletra ornada, vinyeta Text a 1 col. - Reclams

Copia de la relacion, que el ... Cardenal Belluga, ha remitido al ... Arçobispo de Zaragoza, de la acertada eleccion de Pontifice, en el ... Cardena…

1720

Inclou: 1. Breve instruccion, de las calidades, que acreditan a ... Benedicto XIII desde su Nacimiento, hasta su Coronacion. 2. Respuesta de el Cardenal Ursino à su Santidad. 3. Nuevo testimonio de su humildad, y amor à su Religion, se vé en la Carta siguiente Bandes Sign.: A4 Reclams

¿Marxismo o diferenciación social?

2018

Para la sociología, el debate con el marxismo forma uno de los telones de fondo intelectuales y prácticos en el surgimiento de esta joven ciencia durante el siglo xix. Uno de los puntos más interesantes de esta disputa trata del grado necesario de diferenciación de las categorías analíticas para comprender los mecanismos básicos de la sociedad. La capacidad y la necesidad de reducir la compl ejidad que requiere cada ciencia, si quiere ll egar a un nivel de generalización que permita la acción social, se contrapone a una diferenciación analítica que tenga en cuenta la máxima cantidad posibl e de elementos relevantes para la comprensión de lo social. El presente artículo alumbra las relacione…

Evaluación del efecto rejuvenecedor de bio-materiales sobre ligantes para mezclas con alto contenido de asfalto recuperado

2017

The interest in using bio-materials in pavement engineering has grown significantly over the last decades due to environmental concerns about the use of non-recoverable natural resources. In this paper, bio-materials are used together with Reclaimed Asphalt (RA) to restore some of the properties of the aged bitumen present in mixtures with high RA content. For this purpose, two bio-materials are studied and compared to conventional and polymer modified bitumens. Blends of these materials with RA bitumen were produced and studied to simulate a 50% RA mixture. The rejuvenating effect of the two bio-materials on RA has been assessed and compared with the effect of the conventional binders. App…

Cassava starch processing at small scale in North Vietnam

2008

International audience; In Northern Vietnam, small-scale cassava starch processing is conducted in densely populated craft villages, where processors face difficulties to expand their activities. Three different processing systems were studied among a cluster of three communes in the Red River Delta, producing up to 430 t of starch (at 55% dry matter) per day. The first system, type A, is a cylindrical rasper and a manual sieve, the second, type B, is a cylindrical rasper and stirring-filtering machine and the third, type C, used equipment for both the rasping and filtering stages. Moisture, starch, crude fibers and ash content analysis were carried out on samples collected from the A-B-C m…