1,721,069 research outputs found
Rh and Ir/Human Serum Albumine “nanostructured biocatalysts” active in the hydroformylation and/or in the hydrogenation reaction
No full textKarst Landforms in Friuli Venezia Giula: From Alpine to Coastal karst.
No full textAround 20-25% of the Friuli Venezia Giulia region consists of karstified rocks. The geological, geographical and climatic conditions have given rise to a whole series of karst landscapes which have developed in different ways from each other on limestone of different ages, located at different altitudes. One encounters splendid examples of alpine karst (Mt. Canin and Cansiglio-Cavallo Massif), mountain-hill karst (Mt. Ciaurlec, Julian Prealps) and marine coastal karst. In the Classical Karst near Trieste, the worldwide symbol of karst phenomena, over 3,000 caves are known while half a dozen are over 1,000 m in length. There are about eighty solution and collapse dolines with a diameter greater than 100 m
Guidelines for geomorphological sites mapping: examples from Italy
No full textThis paper deals with mapping geomorphosites on the basis of studies carried out in Italy in order to develop geomorphological maps useful for the identification, selection and assessment of geomorphosites, and to create archive maps which can give the public access to information on these subjects. Emphasis is placed on two fundamental points for the implementation of Geomorphosite maps, i.e. map scale and archive techniques. In particular, the latter are presented through some examples in Italy (Sommo fluvial terrace in the Po Plain, glacial landforms in Adamello Natural Park in the Alps of Lombardy) using both traditional maps and digital georeferenced archives. The use of Geographical Information Systems (GIS) is acquiring ever-increasing importance, as it allows useful elaborations, continuous updating of data and easy interaction with the final user. The guidelines for geomorphosite mapping described in this paper have been experimented and assessed in geologically and morphologically different areas. This has produced an important means of communication involving not only specialists but also a large number of users among the general public who are interested in geoconservation. Therefore, the main goal in mapping geomorphosites is to provide the user with immediate perception of an object, regarding its distribution within a territory, and representation of landforms
Ressenyes
Full text linkObra ressenyada: Mauro MARCHETTI; Victoria RIVAS (eds.), Geomorphology and Environmental Impact Assessment. Amsterdam: A. A. Balkema Publishers, 2001
Ressenyes
No full textObra ressenyada: Mauro MARCHETTI; Victoria RIVAS (eds.), Geomorphology and Environmental Impact Assessment. Amsterdam: A. A. Balkema Publishers, 2001
The Coastal Dunes of Sardinia: Landscape: Response to Climate and Sea Level Changes
No full textThe Sardinian coasts are characterized by spectacular aeolian landscapes. These are concentrated in areas where the morphology of the coast, the age-long wind action on the wide sandy beaches and the past availability of sand from the continental shelf—during the low sea level during Pleistocene glacial phases—permitted remarkable volumes of sands to accumulate and to dominate above other forms of the coastal landscape. In the western coast of the island, hit by strong northwestern winds, vast dune fields, adorned by the Mediterranean bush and white flowers of sea, show a spectacular variety of landforms such as small nebkhas, loose dunes, cobblestone floors and deflation furrows. Lithified fossil dunes (aeolianites) occur along most Sardinian coasts, providing important information on past climate and sea level changes. These attractive wind landscapes offer researchers and visitors many and various opportunities of study, recreation and tourism, in a context unique due to the high value of the present and past landscapes
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Granite Landscapes of Sardinia: Long-Term Evolution of Scenic Landforms
No full textSardinia is characterized by spectacular granite landscapes with superimposed scenic landforms. In the eastern part of the island, the granite reliefs consist of mountain massifs and plateaux separated by metamorphic reliefs and limestone plateaux. Granite landscapes show peculiar landforms such as inselbergs, tors and tafoni and diverse erosion microforms. In the extraordinary landscape of Gallura region, wide flat areas with outcropping rocks, vast extensions of isolated rock blocks and inselberg-type dome-shaped reliefs show evidence of a long period of intense weathering. Scenic landforms characterize the spectacular landscape of Sarrabus region, where differential erosion processes have selected the numerous dikes which have conditioned the orientation of the reliefs and coastal landforms. Many archaeological remnants can be found in most granite regions of Sardinia emphasizing the deep bond between man and the physical environment
The Po Delta Region: Depositional Evolution, Climate Change and Human Intervention Through the Last 5000 Years
No full textThe Holocene depositional evolution and landform development of the Po River delta area are hereafter illustrated. Eustasy, climate and a growing degree of human intervention largely influenced the delta history. During late phases of the post-glacial transgression, two large estuarine bays developed. About 3000 years ago, the growth of a rectilinear coastline, under high energy meteo-marine conditions, closed the bays. Several generations of wave-dominated delta lobes then prograded into the sea. The modern delta was induced 400 years ago by the digging of an artificial canal and records very fast environmental modification. The present-day framework is largely artificial in nature and subject to agrowing degree of environmental dangers, such as river and sea water flooding. Significant
landscape values are nevertheless surviving in the region
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