1,720,984 research outputs found
Mass movements inventory map of the Rubbio stream catchment (Basilicata – South Italy).
Full text linkIn the Basilicata region (South Italy) slope movements, caused by soft rocks, rapid tectonic
uplift, earthquakes, and seasonally heavy precipitation, constitute one of the major geologic
hazards. For this reason a detailed inventory map of mass movements has been created in a
test area of south-eastern Basilicata. The map was compiled from field surveys and multitemporal
air photo interpretation. For each landslide, the map depicts the state of activity
and dominant type of slope movement. The integration and analysis of the data obtained by
using a geographic information system has produced the mass movements inventory map at
a scale of 1:25,000.
Mass movements are widespread and play a key role in the landscape evolution of the
study area. A total of 175 landslides were recognized, occupying a surface area of 16.2 km2,
about 9% of the whole basin of interest. The spatial distribution and type of mass
movements are mainly related to the lithology and structural features. Field surveys coupled
with interpretation of multi-temporal aerial photos allowed us to distinguish between active
(20.6%) and inactive (79.4%) landslides. Mass movements, mapped on the basis of
movement type, are represented by slides, flows and complex landslides. The complex and
slide type movements are very common, and represent more than 86% of the landslides
mapped
Evaluation of prediction capability of the artificial neural networks for mapping landslide susceptibility in the Turbolo River catchment (northern Calabria, Italy).
No full textLandslides are one of the most widespread natural hazards that cause damage to both property and life every
year, and therefore, the spatial distribution of the landslide susceptibility is necessary for planning future developmental
activities. In this paper the artificial neural network (ANN) technique is tested for developing a landslide
susceptibility map in Turbolo River catchment, North Calabria, South Italy.
Landslideswere mapped through air-photo interpretation and field surveys, by identifying both the landslide depletion
zones (DZs) and accumulation zones (AZs); and relevant geo-environmental thematic layers pertaining
to landslide predisposing factors were generated using air-photo interpretation, field surveys and Geographic Information
System (GIS) tools. Ten predisposing factors were related to the occurrence of landslide: lithology,
faults, land use, drainage network, and a series of topographic factors: elevation, slope, aspect, plan curvature, topographic
wetness index (TWI) and stream power index (SPI).
In order to evaluate and validate landslide susceptibility, the DZs were divided in twogroups using a randompartition
strategy. The first group (training set) was used to prepare the susceptibility map, employing a backpropagation
learning algorithm in the Idrisi Taiga software. The second group (testing set) was used to validate
the landslide susceptibility model, using the confusion matrix and the receiver operating characteristic (ROC)
curve.
The susceptibilitymapwas classified into five susceptibility classes: very low, low, moderate, high, and very high.
About 46% of the study area falls in high to very high susceptible classes and most of the DZs mapped (87.3%)
occur in the same classes.
The validation results showed satisfactory agreement between the susceptibilitymap and the DZs locations; over
85% of the DZs of the validation set are correctly classified falling in high and very high susceptibility areas. Also,
the ROC curve had shown an area under curve (AUC) value of 0.90which demonstrates the robustness and good
reliability of the landslide susceptibilitymodel. According to these results,we conclude that the map produced by
the artificial neural network is reliable and the methodology applied in the study produced high performance,
and satisfactory results, which may be useful for land planning policy
Denudation processes and landforms map of the Camastra River catchment (Basilicata - South Italy).
No full textThis paper performs denudation processes and landforms characterizing the Camastra River
catchment (Basilicata – South Italy), on a 1:40,000 scale map. The map, which includes
gravitational processes and landforms and water erosion processes and landforms, was
obtained by combining field surveys with the analysis of topographic maps and of multitemporal
aerial photos, ranging from 1954 to 2010. These latter provided information on
both spatial and temporal evolution of geomorphic processes. The integration and the
elaboration of the data obtained in a GIS environment provided the inventory map of
denudation processes and landforms. Landslides are widespread in the study area, and play
an important role in the present-day landscape evolution. A total of 953 landslides were
recognized, occupying a surface of 79 km2, about 22% of the whole study area. The
recognized landslides were mapped on the basis of movement type, as follows: slides,
flows, falls and complex landslides. With regard to water erosion processes, the most
evident and spectacular landforms in the study area are represented by badlands (the so
called calanchi), due to concentration of running water on steep clayey slopes, producing
narrow and knife-edge ridges. Finally, sheet, rill and gully erosion are particularly active on
areas devoid of vegetation cover, as well as on cultivated fields. This kind of map is an
useful tool for land planning policy. Also, these types of studies are basic and
complementary to applied methods for investigation and mapping of land susceptibility to
denudation processes, as landslides and water erosion
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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