1,720,956 research outputs found
PRELIMINARY RESULTS ON THE COMPARISON BETWEEN EMPIRICAL AND PHYSICALLY-BASED RAINFALL THRESHOLDS FOR SHALLOW LANDSLIDES OCCURRENCE
No full textRainfall induced shallow landslides are hazardous
phenomena causing significant damages all over the world.
Rainfall thresholds are the most used tool to predict the
occurrence of such instabilities over large areas. Most of these
thresholds are empirical, basing on past rainfall events
triggered landslides. These present several limitations, due to
the amount and the uncertainty of available data and neglecting
antecedent soil hydrological conditions. Physically-based
thresholds could take into account also for soil hydrological
responses towards rainfalls. Thus, this work aimed to compare
both these typologies of thresholds, reconstructed for a 250 km2
area of northern Italian Apennines prone to shallow
landsliding. Preliminary results of this research show the
significant differences between thresholds reconstructed by
means of different approaches. Empirical threshold estimates a
lower triggering cumulated amount of rainfall than the values
for physically-based thresholds, considering the same duration
of rainfall event. Antecedent pore water pressure conditions
have significant effects on reconstructed threshold, reducing
the amount of rainfall leading to instabilities according to
conditions approaching soil complete saturation. These
preliminary results will be improved in order to create
threshold useful for early warning strategies
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Empirical and Physically Based Thresholds for the Occurrence of Shallow Landslides in a Prone Area of Northern Italian Apennines
Get PDFRainfall thresholds define the conditions leading to the triggering of shallow landslides
over wide areas. They can be empirical, which exploit past rainfall data and landslide inventories, or
physicallybased, which integrate slope physical–hydrological modeling and stability analyses. In this
work, a comparison between these two types of thresholds was performed, using data acquired in
Oltrepò Pavese (Northern Italian Apennines), to evaluate their reliability. Empirical thresholds were
reconstructed based on rainfalls and landslides triggering events collected from 2000 to 2018. The same
rainfall events were implemented in a physicallybased model of a representative testsite, considering
dierent antecedent pore-water pressures, chosen according to the analysis of hydrological monitoring
data. Thresholds validation was performed, using an external dataset (August 1992–August 1997).
Soil hydrological conditions have a primary role on predisposing or preventing slope failures. In
Oltrepò Pavese area, cold and wet months are the most susceptible periods, due to the permanence of
saturated or close-to-saturation soil conditions. The lower the pore-water pressure is at the beginning
of an event, the higher the amount of rain required to trigger shallow failures is. physicallybased
thresholds provide a better reliability in discriminating the events which could or could not trigger
slope failures than empirical thresholds. The latter provide a significant number of false positives,
due to neglecting the antecedent soil hydrological conditions. These results represent a fundamental
basis for the choice of the best thresholds to be implemented in a reliable earlywarning system
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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