1,721,027 research outputs found
Prefazione a: Introduzione alla biologia delle popolazioni vegetali
No full textPrefazione all'edizione italian
Valutazione delle foreste europee attraverso il Li-BioDiv database all’interno della rete ICP Forest
No full textIl Li-BioDiv database (ICP Forests) che deriva dal progetto BioSoil-Biodiversity, rappresenta un database
multidimensionale riguardo alle foreste con dati provenienti da 19 paesi europei, investigati tra il 2005 e il
2008. Tale database contiene informazioni riguardo agli alberi vivi, legno morto e dati riguardo allo strato
erbaceo. Il progetto BioSoil-Biodiversity rappresenta l’unica iniziativa di monitoraggio standardizzato
multidimesionale della diversità forestale a livello europeo, tuttavia, il Li-BioDiv database risulta essere
sottoutilizzato dal mondo scientifico a causa di passate restrizioni di tipo amministrativo-politico e fino ad
oggi non sono state effettuate analisi esplorative profonde.
Pianificazioni ambientali e forestali efficienti richiedono una valutazione e una gestione attenta della
struttura e dell’incertezza legata a grandi moli di dati. Basandoci sui dati grezzi:
(i) abbiamo confrontato informazioni derivate dagli alberi vivi e dal legno morto, con i rispettivi dati
derivanti dagli inventari nazionali. Inoltre;
(ii) abbiamo cercato di caratterizzare l’incertezza relativa ai dati dello strato erbaceo;
(iii) abbiamo calcolato indici classici di diversità forestale e analizzato le loro relazioni e i loro trend spaziali
nei diversi tipi forestali e in diverse condizioni ambientali.
I risultati saranno utili per comprendere con maggiore accuratezza le stime della biodiversità forestale
europea, per interpretarle correttamente e per facilitare l’uso dei dati.Forest ecosystems are the most biodiverse and complex habitats. For this reason, it is very important to
monitor them specifically. The importance of forest monitoring is recognized from several years, and the
most extensive and complete data on the European forest status are given by National Forest Inventories
(NFIs). This information concerns trees but usually it marginally considers other ecosystem components such
as ground vegetation.
The LI-BioDiv (ICP Forests) database, derived from the BioSoil-Biodiversity project, is a multi-dimensional forest
database that contains records collected in 19 European countries in the period 2005-2008. The database includes
information on living trees, deadwood and a ground vegetation survey. The BioSoil-Biodiversity project represents
an unique pan-European effort for a standardized multi-dimensional forest diversity monitoring survey, however
the LI-BioDiv database is still under-utilized by scientists due to policy restrictions and no depth exploratory
analysis of the dataset was carried out until now.
Efficient environmental and forest planning require careful assessment and management of big data
structure and uncertainty. On the basis of row data:
(i) we compared information of standing living trees and deadwood with results of NFIs. Furthermore;
(ii) we characterized uncertainty related on ground vegetation data;
(iii) we calculated several forest biodiversity indicators analyzing therefore their inter-relationship and
their trend over the space and over different forest types and environmental conditions.
The results will be useful for achieving satisfactory accuracy of European forest biodiversity estimates, for
correctly interpretating the estimates, and for facilitating comparable use of the data
Arbor Scientiae
No full textFilm documentario sulla Riserva naturale Montagna di Torricchio.
Janusz Bogdan Faliński, ideazione e testi.
Franco Pedrotti, ideazione e testi.
Jarosław Faliński, regia, riprese, montaggio.
Roberto Canullo, testi e organizzazione della produzione
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
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
- …
