1,720,956 research outputs found
Bidrag till kännedomen om för skogen skadliga bladhorningar i Sverige.
Full text linkThis study of the Melolontha melolontha L. and M. hippocastani Fabr. is the last of the previous published monogrnphies concerning the harmful beetles of the Scarabaeidae family. 1. Phyllopertha horticola L. 1953. 2. Amphimallus solstitialis L. 1956. 3. Serica brunnea L. 1958. The author reviews the regions affected by both species of these beetles, and the research which has been carried out in several countries. The author deals in detail with the occurrence of the cockchafer, his life, and the damage he does to agriculture and forestry in Scandinavia, especially in Sweden. Historical data are given about the considerable harm done to agriculture and also about the control of the beetles; i.e. the collecting and the destroying of them. An account is given of the reduction of the beetles in Sweden as well as in Denmarlk at the beginning of this century, and the cause of this. In the sixties a rapid breeding started again in several places in southern Sweden. In order to fight the beetles, cultivated land was treated with insecticides (aldrin). Biological ways of control were also tried. The cockchafer did most damage to the forest tree nurseries. The periodic enormous multiplying of the cockchafer is limited by unfavourable weather conditions and the rationalization of agriculture and forestry
Die Kiefernrindenwanze, Aradus cinnamomeus Panz. (Hemiptera-Heteroptera)
Full text linkThis monograph on the pine bark bug Aradus cinnamomeus is the result of many years' research work in Scandinavia and other countries. The author gives a historical survey of the places of discovery of this insect, which, not so long ago, was hardly regarded as harmful in the West-European countries. The damage is done by sucking out the cell juice of young pine trees which causes deformity and destruction of the vessels. The damage done by the insect has been explained by means of experimental work and observations. This insect is only to be found on Scots pine and larch. It prefers clean, dry, and warm places and likes pine cultures on light soil. The thick, shadowy, and mixed cultures are only attacked at the edges. The consequences of the appearance of the insect depend mainly upon the size of the insect population and the age of the tree. The chances for 6-10-year-old pines to endure an attack are very small. The necessary prophylactic measure to be taken is to plant the cultures with closer planting space. It is possible to achieve successful results in the control of this insect by fertilizing with nitrogen and also by using the insecticide lindan
Bidrag till kännedomen om för skogen skadliga bladhorningar i Sverige. 3, Brunborren, Serica brunnea L
Full text linkBidrag till kännedomen om för skogen skadliga bladhorningar i Sverige. 1, Trädgårdsborren, Phyllopertha horticola L.
Full text linkBidrag till kännedomen om för skogen skadliga bladhorningar i Sverige. 2, Pingborren, Amphimallus solstitialis 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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