1,720,994 research outputs found
L’UTILIZZO DEI SISTEMI INFORMATIVI GEOGRAFICI (GIS) PER LA GESTIONE DELL’ATTIVITÀ MINERARIA
No full textIn the process of management and control of the different phases in which we can divide mining
activities, a work of integration between the multiple data bases of the activities' phases seems
absolutely necessary. From prospection to operative research, from site localisation to exploitation
method choice, from the evaluation of the activities' environmental impact to the positioning and
planning of the material transformation plants: the implementation of a single digital data base
within a GIS appears to be the best choice for a correct and global information management.
With GIS technology it is now possible to integrate available information, aiding the operator in
organising the data and comprehending their mutual spatial correlations, thus guaranteeing
immediate and rational decisions.
Geological an topographical maps, exploitation activity plans and environmental bonds,
geophysical and geochemical measurements, remote sensing data and other activity related
information can be inserted in the system and visualised at various scales by implementing spatial
and temporal analyses procedures, logically combinating the different information layers
The use of multivariate statistics for the characterization of the magnesite deposit of Euboea Island (Greece)
No full textEdited by S.J.Lippard, A Naess and R.Sinding-Larse
L’utilizzo dei sistemi informativi geografici (GIS) per la gestione dell’attività mineraria
No full textNel processo di gestione e controllo delle diverse fasi in cui possiamo suddividere l’attività mineraria appare indispensabile un’opera di integrazione fra le banche dati multiple riguardanti le fasi stesse dell’attività. Dalla prospezione alla ricerca operativa, dalla localizzazione del sito alla scelta del metodo di coltivazione, dalla valutazione degli impatti connessi con l’attività fino alla collocazione e progettazione degli impianti di trasformazione del materiale, l’implementazione di un’unica banca dati digitale all’interno di un sistema informativo geografico si mostra come la scelta più indicata ai fini di una gestione corretta e globale dell’informazione.
La tecnologia GIS ci fornisce oggi la possibilità di integrare le informazioni di cui si dispone, garantendo la possibilità di decisioni tempestive e razionali, coadiuvando l’operatore nell’organizzazione dei dati e nella comprensione delle loro mutue correlazioni spaziali.
Carte geologiche e topografiche, piani delle attività estrattive e vincolistica ambientale, misurazioni geofisiche e geochimiche, dati telerilevati e tutte le ulteriori informazioni correlate all’attività, possono essere inserite nel sistema e visualizzate a diverse scale di dettaglio, implementando procedure di analisi spaziale e temporale attraverso la combinazione logica dei differenti strati informativ
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
USE OF CONDITIONAL SIMULATION FOR RECOVEREBLE RESERVES EVALUATION OF A POLYMETALLIC OREBODY IN ALBANIA
No full textThis paper describes the preliminary procedure for recoverable reserves evaluation that was applied to Munella orebody (Albania) which is characterised by high dispersion and spatial irregularity of useful metals: copper, zinc, gold and silver. The orebody had been explored by means of 230 subvertical drillings of about 250-300m length. Deviations of the drillholes from the design orientation had been measured at intervals of 25m along 80% of the drillholes.
1) The first step of the task consisted in reconstructing the position of the drillholes for the remaining 20% of the drillings, by means of geostatistical estimation of the unit variations of direction and inclination.
2) The second step was a study of the spatial distribution and of correlation between grades and the characteristics of the mineralisation. A complete variography was carried out. The application of Discriminant Analysis showed that the type of existing mineralisation could be linked to ore grade, allowing to classify all the samples under the four mineralisation classes identified by the petrographic study.
3) The third step consisted in the conditional co-simulation of the grades of the useful minerals for a tentative characterisation of reserves based exclusively on successive selections on each variable simulated.
The result of the preliminary evaluation study was the evidence of the need for a more sophisticated parametrisation of the recoverable reserves that expresses the different degrees of recovery of the orebody depending on the different mineralisation facies and on the alternative mining hypotheses that can be envisaged. The entire procedure identified is the object of ongoing research work
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
- …
