179,296 research outputs found
Proceedings of the 1995 International Workshop on Soft Computing in Remote Sensing Data Analysis
No full textThis volume collect papers presented at the International Workshop on Soft Computing in Remote Sensing Data Analysis, that deal with non conventional techniques based on soft computing methods for the solution of complex problems in Remote Sensing data analysis and recognitio
VBSCan Mid-Term Scientific Meeting
No full textThis document summarises the talks and discussions happened during the VBSCan Mid-Term Scientific Meeting workshop. The VBSCan COST action is dedicated to the coordinated study of vector boson scattering (VBS) from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders
Pluecker forms and the theta map
No full textLet SU X (r, 0) be the moduli space of semistable vector bundles of rank r and trivial determinant over a smooth, irreducible, complex projective curve X. The theta map θ r: SU X (r, 0) → P N is the rational map defined by the ample generator of Pic SU X (r, 0). The main result of the paper is that θ r is generically injective if g ≫ r and X is general. This partially answers the following conjecture proposed by Beauville: θ r is generically injective if X is not hyperelliptic. The proof relies on the study of the injectivity of the determinant map d E: ∧ r H 0(E) → H 0(det E), for a vector bundle E on X, and on the reconstruction of the Grassmannian G(r, rm) from a natural multilinear form associated to it, defined in the paper as the Plücker form. The method applies to other moduli spaces of vector bundles on a projective variety
Plucker forms and the theta map
No full textLet SUX(r,0) be the moduli space of semistable vector bundles of rank r and trivial determinant over a smooth, irreducible, complex projective curve X. The theta map θ_r : SU_X(r,0) → P^N
is the rational map defined by the ample generator of Pic SU_X(r,0). The main result of the paper is
that θ_r is generically injective if g > > r and X is general. This partially answers the following conjecture proposed by Beauville: θ_r is generically injective if X is not hyperelliptic. The proof relies on
the study of the injectivity of the determinant map d_E : ∧^r H^0 (E) → H^0(detE), for a vector bundle
E on X, and on the reconstruction of the Grassmannian G(r,rm) from a natural multilinear form
associated to it, defined in the paper as the Pluecker form. The method applies to other moduli spaces
of vector bundles on a projective variety
Is horn length crucial for Alpine chamois?
No full textAnimal weapons are one of the most studied morphological traits, particularly in Artiodactyla. Since in polygynous species males with larger weapons tend to be more successful in gaining access to females, researchers have traditionally focused on horn size. However, in species with limited horn size, weapon size has been assumed to have a reduced or null effect on life history traits. We examined the effect of intrinsic and extrinsic factors on the length of the second and third segments of Alpine chamois horns (Rupicapra rupicapra) in a population living in a poor environment. Our aim was to test how environmental conditions affected weapon growth and whether compensatory growth occurred. We showed that horn length was isometric to body size, although male horns grew more quickly. Ecological factors such as snow and forage availability affected weapon length, though mildly. No sign of compensatory growth was detected. We inferred that chamois mainly use horns as armament in intrasexual interactions. However, horn length was not a key element since horn growth remained isometric, at least under suboptimal ecological conditions. In species without extreme weapons, the handicap caused by longer horns is likely not compensated by an increase in individual fitness
On vector bundles over reducible curves with a node
No full textLet C be a curve with two smooth components and a single node, and let UC(w, r, X) be the moduli space of w-semistable classes of depth one sheaves on C having rank r on both components and Euler characteristic X. In this paper, under suitable assumptions,we produce a projective bundle over the product of the moduli spaces of semistable vector bundles of rank r on each component and we show that it is birational to an irreducible component of UC(w, r, X). Then we prove the rationality of the closed subset containing vector bundles with given fixed determinant
Identification and characterization of the major components of the Oncorhynchus mykiss Egg Chorion
No full textThe extracellular coat surrounding the fish egg, commonly called the chorion, is a primary envelope that confers biochemical and morphological identity typical of the species. Purified chorions can be easily isolated from either oocytes or ovulated eggs. The aim of this work was to analyze the macromolecular composition of the various chorion components in Oncorhynchus mykiss (Salmonids). SDS‐PAGE analysis of purified chorion showed a reproducible pattern of four major components (129, 62, 54, and 47 kD), representing about 80% of total chorion proteins. The 129 and 47 kD polypeptides were periodic‐acid Schiff (PAS) and concanavalin A positive. After chemical and enzymatic deglycosylation treatments only the 129 and 47 kD components proved to be glycosylated and to belong to the “asparagine‐linked” glycoprotein family. Furthermore, peptide mapping performed on isolated polypeptides showed comigrating fragments on SDS‐PAGE. These results suggest that the four main chorion polypeptides might share common structural features. Copyright © 1991 Wiley‐Liss, Inc
Coherent systems and BGN extensions on nodal reducible curves
No full textLet (C,w) be a polarized nodal reducible curve. In this paper, we consider coherent systems of type (r,d,k) on C with k < r. We prove that the moduli spaces of -stable coherent systems stabilize for large α and we generalize several results known for the irreducible case when we choose a good polarization. Then, we study in detail the components of moduli spaces containing coherent systems arising from locally free sheaves
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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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