1,720,989 research outputs found
Le specie alleate nella lotta contro gli insetti dannosi
No full textLe specie alleate nella lotta contro gli insetti dannos
Analisi della biodiversità riferita a ogni gruppo studiato: Coleotteri Carabidi
No full textAnalisi della biodiversità riferita a ogni gruppo studiato: Coleotteri Carabid
Analisi della biodiversità riferita a ogni gruppo studiato: Lepidotteri diurni
No full textAnalisi della biodiversità riferita a ogni gruppo studiato: Lepidotteri diurn
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
The role of ecological compensation areas on predator populations: an analysis on biodiversity and phenology of Coccinellidae (Coleoptera) on non-crop plants within hedgerows in Northern Italy
No full textThe role of natural vegetation, including trees, shrubs and weeds in supporting predatory insects with particular reference to Coccinellids, was investigated in a two-year field studies. The samplings were carried out by mechanical knock-down (MKD) and visual inspections (VIS) in hedgerow of Northern Italy (Bologna province) between March and October. Among trees and shrubs, Euonymus europaeus L. (spindle-tree) and Prunus spinosa L. (blackthorn) showed the highest number of predatory species, followed by Crataegus monogyna Jacques (hawthorn), Populus sp. (poplar), Cornus sanguinea L. (dogwood) L. and Corylus avellana L. (hazel). Salix alba L. (willow) and Pyrus pyraster Burgsdorf (wild pear) were characterised by the lowest level of predator diversity. Coccinellidae represented the most abundant family of insect predators on trees and weeds. Eggs and/or larvae of Coccinellidae were found in all the tree and shrub species sampled with the exception of Sambucus nigra L. (elder). Data demonstrate that some trees and shrubs species can provide shelter for adult ladybirds, mainly in late summer, when many crops in Northern Italy are harvested.
A list of the Coccinellid species, including relative abundance on the most important plant species, is provided. The number of species sampled by MKD on hedgerows was higher than those sampled by VIS. Among the weeds, Cirsium sp., Rumex sp. and Urtica dioica L. (stinging nettle) supported the reproduction of Coccinellids. Only adults of Coccinellids were found on Daucus carota L., Amaranthus retroflexus L., Dipsacus sylvestris Hudson, Arctium sp., Crepis sp., Picris sp.. Correspondence analysis was used for the ordination of both plant and Coccinellid species and it was performed on the matrix of the data collected by VIS. The role of hedgerows and weeds in landscape management is discussed. Local biodiversity of beneficials in Bologna province can be conserved and improved by increasing “island” habitats like hedgerows and field margins
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
Gli insetti come indicatori della qualità degli agro-ecosistemi e degli interventi agro ambientali
No full textGli insetti come indicatori della qualità degli agro-ecosistemi e degli interventi agro ambiental
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