1,720,999 research outputs found
Multidisciplinary approach (geology, geomorphology, geomechanics, geomatics) for the characterization of the Blais Creek DsGSD (Monashee Mountains, BC, Canada)
No full textField investigations, including detailed geological and geomorphological mapping have been coupled with stratigraphic
and structural studies of the Blais Creek Deep-seated Gravitational Slope Deformations (DsGSD),
Monashee Mountains, British Columbia (BC). To reconstruct the DsGSD evolutionary stages and to evaluate its
controlling factors, a complex methodology has been applied, integrating orthophotos, stereo models and 3D models
of the DsGSD with field and literature data concerning tectonic and glacial history of the Seymour Valley.
General geomechanical properties of the deforming rock mass has been then evaluated for using in numerical
models of the failure mechanism at Blais Creek and to define a broad geomechanical characterization of different
portions of the DsGSD.
The combination between the aerial and terrestrial photogrammetry was appropriate in terms of the quality of
the information obtained more than the quantitative information. Several Ground Control Points (GCPs) and Tie
Points (TPs) were selected from the original DEM received by the BC Government. The use of a multitemporal
aerial triangulation gave the possibility to minimize the error relative to every single block of images. Couples of
oriented photos were used to create stereoscopic models. Multitemporal variations of the Blais Creek slope were
observed and compared to the actual situation of the slope.
The use of terrestrial photogrammetry through Adamtech software confirmed some of the qualitative data obtained
from aerial interpretation and from field survey. The limited use of terrestrial photogrammetry was due to the impossibility
of orienting the 3D terrestrial models. Anyway these models were also useful to confirm one of the
possible mechanisms used to describe the evolution of Blais Creek.
Geomechanical analysis was performed through field work and laboratory tests to characterize the entire slope
and to produce some of the values useful for a possible numerical analysis of Blais Creek. It showed interesting
differences in geomechanical properties between the calc-silicate and quartzite/gneiss.
The kinematic analysis showed very the different instability areas along the slope, even if variations in landforms
and rock masses volume weren’t widespread along Blais Creek slope during the time span covered by aerial photographs
(1973-2007). Indeed, the multitemporal analysis outlined very active instability along the large upper
trench and the lateral active slopes of Blais Creek. Even without significant level of risks in the area, considering
the remote area involved in this instability, some relevant hazards could occur, related to the possible collapse of
SE side of Blais Creek DsGSD.
Regarding the long term evolution of the DsGSD, the extensive network of linear features at Blais Creek is of a
large deforming rock mass. Movement probably began with the retreat of valley glaciers during deglaciation when
the oversteepened valley sides were debuttressed. By these evidences it is possible to theorize that the post-glacial
retreat of the rock face and removal of the ice buttress from both the Seymour and the Blais Creeek Valleys lowered
the factor of stability of the mass as a whole, allowing a deep-seated shear surface to develop gradually over time
by progressive creep
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
Structural analysis of San Leo (RN, Italy) east and north cliffs using 3D point clouds
Full text linkThe town of San Leo, like many others in the historical region of Montefeltro (Northern Apennines, Italy), was
built in medieval period on a calcarenite and sandstone slab, bordered by subvertical and overhanging cliffs up to
100 m high, for defense purposes.
The slab and the underlying clayey substratum show widespread landslide phenomena: the first is tectonized and
crossed by joints and faults, and it is affected by lateral spreading with associated rock falls, topples and tilting.
Moreover, the underlying clayey substratum is involved in plastic movements, like earth flows and slides.
The main cause of instability in the area, which brings about these movements, is the high deformability contrast
between the plate and the underlying clays.
The aim of our research is to set up a numerical model that can well describe the processes and take into account
the different factors that influence the evolution of the movements. One of these factors is certainly the structural
setting of the slab, characterized by several joints and faults; in order to better identify and detect the main joint
sets affecting the study area a structural analysis was performed.
Up to date, a series of scans of San Leo cliff taken in 2008 and 2011, with a Riegl Z420i were analyzed.
Initially, we chose a test area, located in the east side of the cliff, in which analyses were performed using two
different softwares: COLTOP 3D and Polyworks. We repeated the analysis using COLTOP for all the east wall
and for a part of the north wall, including an area affected by a rock fall in 2006.
In the test area we identified five sets with different dips and dip directions.
The analysis of the east and north walls permitted to identify eight sets (seven plus the bedding) of discontinuities.
We compared these results with previous ones from surveys taken by others authors in some areas and with some
preliminary data from a traditional geological survey of the whole area.
With traditional methods only a limited number of measurements can be collected, and in small areas, that often
are not representative of the entire rock mass. In this case, some of the discontinuities are located only in specific
parts of the rock mass, thus resulting difficult to be detected with a classical survey. Moreover, certain sets are
identifiable only in the uppermost or lowermost part of the cliff, and change their orientation along the surface.
For this reason, the integration of classical and innovative surveying techniques can be really useful. TLS survey
and structural software analysis can help to understand which sets are really determinant for the structural
description of the slab at the slope scale and therefore for the stability of the cliffs.
We are planning to complete the TLS survey all around the cliff, to obtain a full 3D model of the rock slab, to be
used for numerical modelling. All the obtained results are validated with a site-survey, which is in progress at the
moment
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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