1,720,979 research outputs found
Automatic optimization strategy for the design of circular multipolar magnets
No full textThis paper presents an optimization procedure for the design of circular magnets of multipolar symmetry in the presence of an iron screen. The procedure is based on the combined use of field calculations and optimization techniques and can be applied when the field is generated either by a distribution of currents or of magnetic materials. The numerical optimization technique uses the positions and/or orientations of the field generating elements as parameters (currents or permanent magnets). The technique has proved to be very effective in obtaining a good uniformity of field in a large fraction of the magnet volume. It should reduce the subsequent shimming operations. The method is almost completely automatic and simpler than other standard methods normally used to design new magnet geometries which are based on field calculation programs and ‘manual’ optimization procedures
Distribution of sensitivity to common botryticides in Lombardy
Full text linkOn grapevine, grey mould caused by Botrytis cinerea Pers. induces serious yield losses and unpleasant changes in the qualitative characteristics of berry content. Fungicides are usually applied in order to control B. cinerea but their repeated use in vineyard can select resistant strains of the pathogen.
Aim of the present work is not only to monitor the sensitivity distribution of the pathogen strains to the botryticides most commonly used in vineyard, but also the possible correlation between the sensitivity level and both the mating type and the presence of transposons Boty and Flipper.
During 2011, 20 strains were randomnly isolated from symptomatic samples collected in 4 vineyards selected in each of the main viticultural provinces in Lombardy, Brescia, Mantova, Pavia and Sondrio. An untreated vineyard was included in the survey. The 320 strains isolated in Lombardy were tested for their sensitivity to boscalid, fenhexamid, cyprodinil and fludioxonil, their mating type and the presence of transposons. The Resistance Factor, RF, (EC50 of the selected strain/average EC50 in the untreated vineyard) was calculated for the strains showing high EC50. RFs > 10 indicate a reduced sensitivity.
The average EC50 observed in Lombardy for boscalid, fenhexamid and fludioxonil were similar to those calculated for B. cinerea in Europe, while higher values of this parameter were obtained for cyprodinil. No remarkable differences were observed in the EC50 distribution in the 4 provinces, apart from the higher values for cyprodinil and fludioxonil recorded in Pavia. RFs > 10 characterized 7, 12 and 5 strains respectively for boscalid cyprodinil and fludioxonil and 5 isolated showed a reduced multi drug sensitivity. The presence of Boty either alone or together with Flipper seems to be associated with higher RFs concerning all the tested fungicides. Association between mating type and fungicide sensitivity is less defined. From these data, B. cinerea populations in Lombardy seem to be characterized by an adequate sensitivity against botryticides. The strains showing a reduced sensitivity need to be further characterized, in particular for their fitness
A global optimization approach for the PM Synchronous Motor Design
No full textThe paper deals with the optimization problem of the design of Interior Permanent Magnet Syncrhronous Motor. To avoid high computational cost of Finite Element evaluation, a new global minimization algorithm is proposed
Global Optimization Approach for the Synchronous Motors Design by Finite Element Analysis
No full textThe aim of this paper is to propose a global minimization algorithm belonging to the class of Controlled Random Search algorithms, to interface with the Finite Element analysis procedure for optimizing the design of Buried Permanent Magnet Synchronous motors and Synchronous Reluctance motors.
The behavior of the proposed algorithm has been compared, in terms of attainable optimum and computation time, with the one of a minimization procedure available at commercial software. This comparison has shown a significant more efficiency of the considered algorithm especially in the more complex designing of a Synchronous Reluctance motor.
The goodness of the results achieved with the proposed algorithm shows that combining the FE analysis with a suitable strategy is an effective and powerful tool for the design optimization of electric motors
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
Algebraic deformations of toric varieties II. Noncommutative instantons
No full textWe continue our study of the noncommutative algebraic and differential geometry of a particular class of deformations of toric varieties, focusing on aspects pertinent to the construction and enumeration of noncommutative instantons on these varieties. We develop a noncommu- tative version of twistor theory, which introduces a new example of a non- commutative four-sphere. We develop a braided version of the ADHM construction and show that it parameterizes a certain moduli space of framed torsion free sheaves on a noncommutative projective plane. We use these constructions to explicitly build instanton gauge bundles with canonical connections on the noncommutative four-sphere that satisfy appropriate anti-selfduality equations. We construct projective moduli spaces for the torsion free sheaves and demonstrate that they are smooth. We define equivariant partition functions of these moduli spaces, finding that they coincide with the usual instanton partition functions for super- symmetric gauge theories on C
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
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