1,720,998 research outputs found
Classification of holomorphic Pfaff systems on Hopf manifolds
Get PDFWe classify holomorphic Pfaff systems (possibly non-locally decomposable) on certain Hopf manifolds. As a consequence, we prove some integrability results. We also prove that any holomorphic distribution on a general (non-resonance) Hopf manifold is integrable
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Moduli Spaces Of Framed Instanton Bundles On C{double-strcuk}p{double-strcuk}3 And Twistor Sections Of Moduli Spaces Of Instantons On C{double-strcuk}2
No full textWe show that the moduli space M of framed instanton bundles on C{double-strcuk}P{double-strcuk}3 is isomorphic (as a complex manifold) to a subvariety in the moduli of rational curves of the twistor space of the moduli space of framed instantons on R{double-strcuk}4. We then use this characterization to prove that M is equipped with a torsion-free affine connection with holonomy in Sp(2n,C{double-struck}). © 2011 Elsevier Inc.227415261538Atiyah, M.F., Complex analytic connections in fibre bundles (1957) Trans. Amer. Math. Soc., 85, pp. 181-207Chern, S.S., Eine Invariantentheorie der Dreigewebe aus r-dimensionalen Mannigfaltigkeiten im R2r (1936) Abhandl. Math. Semin. Univ. HamburgCoandǎ, I., Tikhomirov, A.S., Trautmann, G., Irreducibility and smoothness of the moduli space of mathematical 5-instantons over P3 (2003) Internat. J. Math., 14, pp. 1-45Donaldson, S., Instantons and geometric invariant theory (1984) Comm. Math. Phys., 93, pp. 453-460Feix, B., (1999), p. 78. , Hyperkähler metrics on cotangent bundles, Ph.D. thesis, OxfordFeix, B., Hyperkähler metrics on cotangent bundles (2001) J. Reine Angew. Math., 532, pp. 33-46Frenkel, I.B., Jardim, M., Complex ADHM equations, and sheaves on P3 (2008) J. Algebra, 319, pp. 2913-2937Grauert, H., Mülich, G., Vectorbundel von Rang 2 uber dem n-dimensionalen komplex projective Raum (1975) Manuscripta Math., 16, pp. 75-100Hauzer, M., Langer, A., Moduli spaces of framed perverse instantons on P3 (2010) Glasg. Math. J., 53, pp. 51-96Jardim, M., Instanton sheaves on complex projective spaces (2006) Collect. Math., 57, pp. 69-97Jardim, M., Atiyah-Drinfeld-Hitchin-Manin construction of framed instanton sheaves (2008) C. R. Acad. Sci. Paris Ser. I, 346, pp. 427-430Kaledin, D., Hyperkähler structures on total spaces of holomorphic cotangent bundles (2001) Hyperkähler Manifolds, , International Press, Boston, D. Kaledin, M. Verbitsky (Eds.)Kaledin, D., Verbitsky, M., Non-Hermitian Yang-Mills connections (1998) Selecta Math. (N.S.), 4, pp. 279-320Maruyama, M., The Theorem of Grauert-Mülich-Spindler (1981) Math. Ann., 255, pp. 317-333Nagy, P.T., Invariant tensorfields and the canonical connection of a 3-web (1988) Aequationes Math., 35, pp. 31-44Nakajima, H., (1999) Lectures on Hilbert Schemes of Points on Surfaces, , American Mathematical Society, ProvidenceNitta, T., Vector bundles over quaternionic Kähler manifolds (1988) Tohoku Math. J., 40, pp. 425-440Salamon, S., Quaternionic Kähler manifolds (1982) Invent. Math., 67, pp. 143-171Tikhomirov, A.A., The main component of the moduli space of mathematical instanton vector bundles on P3 (1997) J. Math. Sci., 86, pp. 3004-3087Verbitsky, M., Hyperholomorphic bundles over a hyperkähler manifold (1996) J. Algebraic Geom., 5, pp. 633-669Verbitsky, M., Hypercomplex varieties (1999) Comm. Anal. Geom., 7, pp. 355-39
Any Component Of Moduli Of Polarized Hyperkähler Manifolds Is Dense In Its Deformation Space
No full textLet M be a compact hyperkähler manifold, and W the coarse moduli of complex deformations of M. Every positive integer class v in H2(M) defines a divisor Dv in W consisting of all algebraic manifolds polarized by v. We prove that every connected component of this divisor is dense in W. © 2013.1012188197Anan'in, S., Grossi, C.H., Coordinate-free classic geometries (2011) Mosc. Math. J., 11, pp. 633-655. , arxiv:math/0702714Beauville, A., Variétés Kähleriennes dont la première classe de Chern est nulle (1983) J. Differential Geom., 18 (4), pp. 755-782Besse, A.L., (1987) Einstein Manifolds, p. 516. , Springer-Verlag, Berlin, Heidelberg, New YorkBogomolov, F.A., On the decomposition of Kähler manifolds with trivial canonical class (1974) Math. USSR Sb., 22 (4), pp. 580-583Bogomolov, F.A., Hamiltonian Kähler manifolds (1978) Sov. Math. Dokl., 19, pp. 1462-1465Boucksom, S., Higher dimensional Zariski decompositions (2004) Ann. Sci. Ec. Norm. Super. (4), 37 (1), pp. 45-76. , arxiv:math/0204336Demailly, J.-P., Paun, M., Numerical characterization of the Kähler cone of a compact Kähler manifold (2004) Ann. of Math., 159, pp. 1247-1274. , arxiv:math/0105176Fujiki, A., On the de Rham cohomology group of a compact Kähler symplectic manifold (1987) Adv. Stud. Pure Math., 10, pp. 105-165Gritsenko, V., Hulek, K., Sankaran, G.K., Moduli spaces of irreducible symplectic manifolds (2010) Compos. Math., 146 (2), pp. 404-434. , arxiv:0802.2078Gritsenko, V., Hulek, K., Sankaran, G.K., Abelianisation of orthogonal groups and the fundamental group of modulae varieties, p. 21. , arxiv:0810.1614Huybrechts, D., Compact hyper-Kähler manifolds: basic results (1999) Invent. Math., 135 (1), pp. 63-113. , arxiv:alg-geom/9705025Huybrechts, D., Finiteness results for hyperkähler manifolds (2003) J. Reine Angew. Math., 558, pp. 15-22. , arxiv:math/0109024Kamenova, L., Verbitsky, M., Families of Lagrangian fibrations on hyperkaehler manifolds, p. 13. , arxiv:1208.4626Verbitsky, M., Algebraic structures on hyperkähler manifolds (1996) Math. Res. Lett., 3, pp. 763-767Verbitsky, M., Trianalytic subvarieties of hyperkaehler manifolds (1995) Geom. Funct. Anal., 5 (1), pp. 92-104Verbitsky, M., A global Torelli theorem for hyperkähler manifolds, p. 47. , arxiv:0908.4121Verbitsky, M., Hyperkähler SYZ conjecture and semipositive line bundles (2010) Geom. Funct. Anal., 19 (5), pp. 1481-1493. , arxiv:0811.0639Verbitsky, M., Parabolic nef currents on hyperkaehler manifolds, p. 19. , arxiv:0907.4217Vinberg, E.B., Gorbatsevich, V.V., Shvartsman, O.V., Discrete Subgroups of Lie Groups (2000) Encyclopaedia of Mathematical Sciences, 21, p. 224. , Springer-VerlagViehweg, E., Quasi-projective Moduli for Polarized Manifolds (1995) Ergebnisse der Mathematik und ihrer Grenzgebiete, 3. Folge, 30 (BAND). , http://www.uni-due.de/~mat903/books.html, Springer-Verlag, Berlin, Heidelberg, New York, also available a
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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