1,720,961 research outputs found
Utilizzo di crop flowers per aumentare la biodiversità nel paesaggio agrario
Full text linkUsing Crop Flowers to Increase the Biodiversity in Agricultural Lamdscape.The use of field border strips with crop
flowers (plants with a lot of nectar) influences some important factors of the agricultural ecosystem. These include the
biodiversity, erosion, fertility and water balance of the soil. All the basic elements for sustainable agriculture. In the Mediterranean
area, thousands of years of cohabitation between man and the environment have resulted in severe changes in the nature of the
area and in the rural environment. The technological innovations available in recent times have made agricultural operations
even more accentuated, above all in terms of protection for the environment. Many researchers in the sector believe that the
main cause of the extinction of many species is the continual loss of their natural habitat (Shaffer, 1997). During the last century,
the population of the world increased fourfold and given that the area of cultivated land doubled (Creutzen, 2006) as a
consequence of this, it is therefore easy to imagine just how much the agricultural sector has affected the loss of biodiversity.Most
plants are enomophilous. The community of phytophagous insects is made up of species which live in close contact with a host
plant, a similar relationship exists between pollinators and plants. Some Hymenoptera, such as the bumblebee (Bombus spp.)
cannot fly for very long distances, so the absence of flowering plants in vast areas means that these species will die out. The
objective of our work was to assess the importance of field border strips with crop flowers for landscape. The experimentation
was performed for the European project called Operation Pollinator which aims at demonstrating that productive agriculture
and a rich and live environment in terms of biodiversity can exist contemporaneously
The Influence of Different Nitrogen Treatments on the Growth and Yield of Basil (Ocimum Basilicum L.)
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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
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