1,721,035 research outputs found
Mr F. Bellotti, L'industria della juta in Italia. Mr Fr. Bonsack, Die Versorgung der Welt mit Jute unter besonderer Berücksichtigung der Wirtschafts geographischen Grundlagen
No full textDemangeon Albert. Mr F. Bellotti, L'industria della juta in Italia. Mr Fr. Bonsack, Die Versorgung der Welt mit Jute unter besonderer Berücksichtigung der Wirtschafts geographischen Grundlagen. In: Annales d'histoire économique et sociale. 2ᵉ année, N. 6, 1930. pp. 287-288
Mr F. Bellotti, L'industria della juta in Italia. Mr Fr. Bonsack, Die Versorgung der Welt mit Jute unter besonderer Berücksichtigung der Wirtschafts geographischen Grundlagen
No full textDemangeon Albert. Mr F. Bellotti, L'industria della juta in Italia. Mr Fr. Bonsack, Die Versorgung der Welt mit Jute unter besonderer Berücksichtigung der Wirtschafts geographischen Grundlagen. In: Annales d'histoire économique et sociale. 2ᵉ année, N. 6, 1930. pp. 287-288
Transport and deposition processes of volcaniclastic deposits inferred by multivariate statistic analyses and GIS applications : The case of Nevado de Toluca volcano (Mexico)
No full textParticle size analysis is widely used in sedimentology to determine the characteristics of different depositional environments and infer flow transport and depositional processes. However for volcaniclastic flows, this methodology has been applied mainly for a descriptive purpose or for typical generic consideration of down flow variation of statistical parameters.
For this study we choose the case of Nevado de Toluca volcano (Mexico) due to the previous knowledge of its geological evolution, stratigraphic succession and spatial distribution of volcaniclastic units. Grain size analyses (by coupling photo-sieving, particle size and photosedimentographic analyses) and frequency distributions curves have been carried out to characterize block-and-ash flow and debris avalanche deposits.
The multivariate statistic analysis (discrimination function) shows that sedimentological parameters are good discriminators between samples belonging to block and ash flow and debris avalance deposit.
In addition, the application of the same methodology within each single deposit (DAD and BAF) allows to identify the presence of subpopulations and reveals differences among proximal, medial and distal facies. The resulting subpopulations have been plotted in a GIS environment to evidence these sedimentological variation respect to the deposit thickness and flow interaction with topography. By overlapping the flow thickness map with the subpopulation statistic analyses it is possible to define the relationships between facies and its position into the flow and to provide a model of transport and deposition mechanism of debris avalanche deposit and block and ash flow at Nevado de Toluca volcano
Trace statistic extraction techniques for fast instruction level microprocessor evaluation
No full textReconstruction of Etna effusive activity of the past 15 ka and implication for long-term eruptive behaviour of the volcano
No full textGeological Map of the Western Rift of M. Etna (Italy)
No full textMt. Etna (3340 m a.s.l.) is the most active volcano in Europe, covering an area of 1250 km2, with more than 500 ka of geological history. In this work an accurate structural and geological field survey of the Western-Rift was performed at 1:10,000 scale, by using lithostratigraphic criteria and Unconformity-Bounded Units (UBU), in according to the guidelines suggested by International Subcommission on Stratigraphic Classification (ISSC) and the Italian Geological Survey (SGN). In order to improve the field-work data, an aerial photo interpretation was realized, by using high resolution ortho-photo and DEM elaboration, producing a mapping with high detail of the lava flows boundaries. During the field work activity the eruptive fissures configuration of the WR has been mapped, and lithostratigraphic units have been identified and organized in different ranks: formation, member and lava flow. The lithostratigraphic units allow to identify immediately during the field-survey the lithologic characteristics and stratigraphic relationships of rock bodies. To summarize and synthesise the main phases of the WR evolution, the lithostratigraphic units were grouped in different synthem units according to the stratigraphic framework of the volcano east flank, where the applied methodology has been defined and tested for the first time.
The volcanic succession of the West-Rift is formed by the oldest subaerial lava flows of Etna region (Adrano Synthem) that are unconformably covered by the lava flow succession generated by old volcano activity (La Timpe Synthem) and by products of Ellittico Volcano (Concazze Synthem). The main portion of the study area is formed by the product related to the Mongibello volcano eruptive activity of the past 14 ka (Il Piano Synthem). The Mongibello lava succession is constituted by the superimposition of several lava flow fields generated by more than 50 eruptive fissures, forming the core of the West-Rift.
The eruptive fissures strike about 260°, fed several monogenetic cones and are concentrated in a bounded zone 4 km-wide, located in the central portion of the western flank. Some of these eruptive fissures took place in the last 2 ka and are reported in historical chronicles.
The result of this work is a detailed geological map at 1:20,000 scale of the WR, which points out the geological and structural setting of the area and significantly improve the knowledge of its evolution in order to better assess the whole eruptive history of Mt. Etna as well as its structural framework
Structural arrangement of Mt. Etna Western Rift inferred from soil gas survey and geostatistical analysis
No full textSoil gas survey is a well known methodology to infer the presence of buried tectonic lineaments on volcano edifices from the evaluation of the orientation and extent of soil CO2 degassing anomalies. This application is an useful tool mainly where there is no evidence of tectonic structures found at the surface from geological survey, because of high resurfacing rate of investigated areas.
In this study attention was focused on an area located on Mt. Etna Western Rift, one of the most prominent, yet less understood and studied feeding systems of the volcano. It is constituted by many eruptive fissures and monogenetic cones emplaced from 15 ka until 1974.
In this area, a multidisciplinary approach was carried out based on detailed geological survey at 1:10,000 scale, soil CO2 efflux measurement, GIS and geostatistical applications, in order to better define the tectonic settings of this part of the volcano. The field work allowed identifying more than 15 emission centres as well as 10 eruptive fissures. The CO2 sampling strategy consisted of gas efflux measurements (with the accumulation chamber method) on a grid of sampling points about 100 m spaced. The geological and soil gas surveys allowed to obtain high resolution maps of the distribution of geological formations, structural lines and soil CO2 anomalies. A large amount of data were collected and were processed using a geostatistical approach.
Geostatistics combined with variogram analyses showed a good spatial correlation among CO2 anomalies, with an anisotropy mainly oriented N60°. The spatial pattern of these anomalies is in agreement with the structural arrangement of Mt. Etna Western Rift and suggests the presence of hidden faults sub-parallel to the main rift direction
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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