1,720,966 research outputs found
Multi-approach for the assessment of rock slope stability using in-field and UAV investigations
Full text linkThe present study is aimed at analyzing the rockfall phenomena involving a carbonate rock scarp in San Donato di Ninea village (Calabria, south Italy), where some buildings and a portion of a road are exposed to a high hazard condition. The geomechanical investigations of the rock scarp were performed through a multi-approach based on in-field investigations, geophysical surveys, and high resolution of images acquired by a drone. The achieved data allowed to assess the quality of the rock mass and the susceptibility of rock slope to failure through the Rock Mass Rating and the Slope Mass Rating clas sifications, respectively. The obtained results showed slope conditions ranging between unstable and completely unstable. Geophysical surveys allowed to investigate the subsurface material and showed a high jointing rock mass in the shallower portion. In order to acquire the potential change in geomechanical features on the whole escarpment rock, high-resolution images were acquired by a drone. Thus, a 3D dense point cloud model was reconstructed in a setting of high accuracy based on 55 million of points with a density of 748.85 points for m2. The 3D model was imported into CloudCompare software to extract the geological planes through FACETS plugin, which allowed to recognize the jointing sets on the whole surface of rock escarpment. The digital data were compared with the ones collected by scanline method in order to verify their soundness, and further detailed digital investigations were carried out on human inaccessible areas to examine the corresponding fracturing degree
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
Implications of the Incremental Pulse and Verify Algorithm on the Forming and Switching Distributions in RERAM Arrays
No full textIn this paper, the implication of an incremental pulse and verify (IPV) algorithm onto the Forming, Set, and Reset read current distributions is studied in terms of the intercell variability and the reliability of 4-kb RERAM arrays with a Ti/HfO2/Ti/TiN stack. It is shown that the IPV algorithm causes an initial generalized Pareto distribution (GPD) for Forming, Set, and Reset current. Due to the read-induced fluctuations, the GPD evolves to a bimodal distribution for all the cases. The separation value between the two distributions coincides with the threshold current of the IPV algorithm. The main problem arises from the minor distribution, which does not respect the algorithm stop condition. The percentage of the unwanted minor distribution is in the order of a few percentage points for Reset and lower than 1% for Set
Ophiolitic sequences from the central sector of the Catena Costiera (Calabria): stratigraphy, petrology and structural analyses
Full text linkMesozoic ophiolites crop out in the Catena Costiera (Northern
Calabrian Arc). The Northern Calabrian Arc is characterized by
the superposition of three structural elements (OGNIBEN, 1973):
the uppermost Hercynian continental section intruded by late-
Variscan granitoids (Calabrian Nappe), the intermediate ophiolitic
Nappe and the lowermost Mesozoic passive margin carbonate
sequences (Apenninic Units).
The studied area is located in the central Catena Costiera
(fig. 1) where the ophiolitic sequences are characterized by both
aphyric and porphyritic metabasalts with a T-MORB affinity
(LIBERI et alii, 2006). They represent the basement of a peliticarenaceous
metasedimentary sequence, previously interpreted as a
pre-Mesozoic continental basement (Bagni Unit of AMODIO MORELLI
et alii, 1976). In the metasedimentary cover, a remarkable
increase in the carbonatic supply is noticed moving from south
to north of the study area. According to this evidence two stratigraphic
sequences have been defined for the southernmost Cozzo
Cervello area and the northernmost San Martino di Finita area.
The Cozzo Cervello area ophiolitic sequence is characterized
by: metabasites, thin levels of volcanoclastic metasediments, rare
metacarbonates, metapelites and metarenites.
The San Martino di Finita area ophiolitic sequence is instead
characterized by: metabasites, volcanoclastic metasediments and
calcschists.
The studied rocks underwent a polyphase deformation history
and the meso- and microstructural analyses allowed distinguishing
three main (D1-D3) deformation phases:
– D1, this phase is characterized by a S1 foliation locally developed
and preserved as microlithons inside the S2 main
foliation;
– D2, a N-S trending isoclinal folding event (F2; fig. 2 a,b) is
responsible for the formation of the S2 foliation (fig. 2 d),
that represent the main surface recognizable in the field;
– D3, this phase is characterized by asymmetric folds (F3)
developed at different scales and showing a WNW-ESE trending
axes. An incipient foliation (S3) is locally developed in
the phyllosilicate-rich levels (fig. 2 c,d).
*Dipartimento di Scienze della Terra, Università della Calabria.
([email protected]) **Dipartimento di Scienze della Terra, Università
di Pisa
The petrographic analysis allows to define the mineralogical
assemblage of the different lithotypes and to determine the
relationships between deformation and blastesis.
The metabasites are characterized by the mineralogical assemblage:
Epidote + Na-amphibole + Lawsonite + Phengite + Chlorite
+ Albite Calcite Quartz + Magnetite. Metapelites and metarenites
are characterized by: Epidote + Phengite + Stilpnomelane
+ Na-Amphibole + Pumpellyite + Chlorite + Albite + Quartz +
Magnetite. The calcschist are constituted by: Calcite + Phengite +
Chlorite + Albite + Quartz + Magnetite.
The described mineralogical assemblages suggest that the studied
rocks underwent P-T conditions typical of the blueschist
facies as suggested by the blastesis of Na-amphiboles, lawsonite,
stilpnomelane and phengite along the S2 foliation. The blastesis
of white mica can be observed along the S3 foliation also. The following
metamorphic retrogression developed within the prehnitepumpellyite
facies and is characterized by a static recrystalization.
Fig. 1 – Tectonic sketch map of central sector of the Catena Costiera, after
LIBERI et alii (2006).
64
OPHIOLITIC SEQUENCES FROM THE CATENA COSTIERA 65
Fig. 2 – a) isoclinal folds (F2) in the metapelites of Cozzo Cervello area;
b) isoclinal folds (F2) in the calcschists of San Martino di Finita area;
c) crenulation F3 in the metabasites; d) microscopic view of the main
foliation S2 deformed by the later D3 phase in the metapelites. The white
line indicates white mica flakes along S3.
The field study and the tectonometamorphic evolution reconstructed
for the ophiolitic sequences cropping out in the central sector
of the Catena Costiera of Calabria show that a subduction and
exhumation history inside an accretionary wedge can be proposed.
In particular, the characterization and the definition of the complex
relationships existing within the ophiolitic metasedimentary cover
allow us to propose:
1. the source area was composite, with both carbonatic and
siliciclastic contributions;
2. the presence of terrigenous deposit, even in the lowermost
part of the sedimentary sequence, seem to indicate that this
part of oceanic crust was located close to the continental
margin;
3. the San Martino di Finita type sedimentary cover can be
correlated with that of the Malvito ophiolitic unit (sensu
AMODIO MORELLI et alii, 1976), cropping out in the
northernmost sector of the Catena Costiera;
4. the subdivision between the Bagni and Gimigliano-Monte
Reventino Units, as proposed by DIETRICH & SCANDONE
(1972) and AMODIO MORELLI et alii (1976) for the study
area, is not supported by the data collected in this work.
REFERENCES
AMODIO MORELLI L., BONARDI G., COLONNA V., DIETRICH D., GIUNTA G.,
IPPOLITO F., LIGUORI V., LORENZONI S., PAGLIONICO A., PERRONE V.,
PICCARRETA G., RUSSO M., SCANDONE P., ZANETTIN-LORENZONI E. &
ZUPPETTA A. (1976) - L’arco Calabro-peloritano nell’orogene appenninicomagrebide.
Mem. Soc. Geol. It, 17, 1–60.
DIETRICH D. & SCANDONE P. (1972) - The position of the basic and ultrabasic
rocks in the tectonic units of the southern Apennines. Atti Acc. Pont., 21,
61–75.
LIBERI F., MORTEN L. & PILUSO E. (2006) - Geodynamic significance of the
ophiolites within the Calabrian Arc. Island Arc, 15, 26–43.
OGNIBEN L. (1973) - Schema geologico della Calabria in base ai dati odierni.
Geologia Romana, 12, 243
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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