1,720,973 research outputs found
Light hydrocarbons as redox and temperature indicators in the geothermal field of El Tatio (northern Chile)
No full textEl Tatio (northern Chile), one of the largest geothermal fields of South America, is presently undergoing a new program
of geothermal exploration, after the failure of the first exploration phase in the early 1970s. The geochemical features of the
fluid discharges characterizing this system mainly consist of boiling pools and fumaroles, and represent the result of a complex
mixing process involving 3 main components: (i) hydrothermal; (ii) atmospheric; (iii) magmatic. Chemical reactions
involving light hydrocarbons equilibrate at higher temperature than those directly measured in the geothermal wells and
calculated on the basis of the composition of the inorganic gas species. This suggests that in the deeper parts of the hydrothermal
system temperatures higher than 300 C may be achieved. Such results can have a strong impact for the evaluation
of the potential resources of this geothermal system. Moreover, the chemical characteristics of the organic gas fraction
allow the assessment of the chemical–physical conditions governing the geochemical processes acting on geothermal fluids
at depth
Prospecciòn gravimetrica y modelo gravimetrico tridimensional del tramo septentrional del Valle de Lerma,Salta.
No full text
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
La Candelaria Ridge (NW Argentina) as a natural lab for the exploration of the geothermal system of Rosario de La Frontera:methods and preliminary results
No full textWithin the scientific framework recently proposed by
C.U.I.A. (Consorzio Universitario Italiano per l’Argentina) for
the development of applied researches on the Argentina territory,
several research groups, belonging to selected Italian and
Argentina Universities, converged in the last year on the research
line devoted to the “Sustainable development of future towns”.
This contribution focuses on the preliminary results achieved
by this collaboration among the Universities of Camerino, Jujuy,
Roma Tre, Salta, Sapienza.
The project focuses on the application of robust
methodologies and the development of new ones to explore the
geothermal potential of the area of Rosario de La Frontera (NW
Argentina) located at the northern edge of La Candelaria Ridge,
one of positively inverted structures cropping out between the
provinces of Salta and Tucuman. It belongs to the Santa Barbara
System of the Andes retro-wedge.
This approach intends to contribute to the sustainable
development of the town of Rosario de La Frontera, that can be
potentially based on the exploitation of medium enthalpy
(90°<T<150°C) geothermal resources.
The main goals of this project are:
To constrain the origin of the geothermal anomaly that
affects the study area by means of the reconstructions of the
paleo-thermal, geochemical and morpho-structural evolution of
La Candelaria Ridge. The first type of reconstruction is
approached by means of 1D modeling of indicators of thermal
exposure (e.g. vitrinite reflectance, clay minerals geothermometers
and Th and Tm from fluid inclusions). The second
is based on hydro-geochemical and isotopic investigations on
waters sampled in the sites of thermal springs. The third is based
on quantitative elaboration of aerial photos;
To evaluate the size, fracture network and permeability of
the potential geothermal reservoir and effectiveness of its caprock
by means of traditional structural analyses at different scales
and combined deterministic-stochastic reconstruction of the
fracture network with the aid of dedicated software;
To identify the recharge areas and deep fluid flow by means
of geological and geophysical investigations (namely based on
audiomagnetotelluric survey);
To model the geothermal system.
The preliminary results related to the first three
aforementioned objectives are presented in this scientific session
with a series of companion posters.
We present the preliminary analytical and modelling results
concerning the paleo-thermal conditions recorded by the
sedimentary succession cropping out along La Candelaria Ridg
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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