1,723,389 research outputs found
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
On Maximal Curves Of Fermat Type
No full textThe aim of this paper is to give a characterization of a maximal curve given by the equation xn + ym = 1 over a finite field Fq2. © de Gruyter 2013.134613617Aguglia, A., Korchmáros, G., Torres, F., Plane maximal curves (2001) Acta Arith., 98, pp. 165-179Cossidente, A., Korchmáros, G., Torres, F., Curves of large genus covered by the hermitian curve (2000) Comm. Algebra, 28, pp. 4707-4728Fuhrmann, R., Garcia, A., Torres, F., On maximal curves (1997) J. Number Theory, 67, pp. 29-51Garcia, A., Stichtenoth, H., Xing, C.-P., On subfields of the hermitian function field (2000) Compositio Math., 120, pp. 137-170Garcia, A., Tafazolian, S., Certain maximal curves and cartier operators (2008) Acta Arith., 135, pp. 199-218Garcia, A., Tafazolian, S., On additive polynomials and certain maximal curves (2008) J. Pure Appl. Algebra, 212, pp. 2513-2521Hirschfeld, J.W.P., Korchmáros, G., Torres, F., (2008) Algebraic Curves Over a Finite Field, , Princeton Univ. PressKazemifard, A., Naghipour, A.R., Tafazolian, S., A note on superspecial and maximal curves Bull. Iranian Math. Soc., , To appearKontogeorgis, A.I., The group of automorphisms of the function fields of the curve x n +ym+ 1 = 0 (1998) J. Number Theory, 72, pp. 110-136Rück, H.-G., Stichtenoth, H., A characterization of hermitian function fields over finite fields (1994) J. Reine Angew. Math., 457, pp. 185-188Stichtenoth, H., (2009) Algebraic Function Fields and Codes, , SpringerTafazolian, S., A characterization of maximal and minimal fermat curves (2010) Finite Fields Appl., 16, pp. 1-3Tafazolian, S., A family of maximal hyperelliptic curves (2012) J. Pure Appl. Algebra, 216, pp. 1528-153
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
On Fq2-maximal Curves Of Genus 1/6(q - 3)q
No full textWe show that an Fq2-maximal curve of genus 1/6(q - 3)q > 0 is either a non-reflexive space curve of degree q + 1 whose tangent surface is also non-reflexive, or it is uniquely determined, up to isomorphism, by a plane model of Artin-Schreier type whenever q ≥ 27. © 2005 Heldermann Verlag.461241260Abdón, M., (2000) On Maximal Curves in Characteristic Two, , Ph.D. dissertation, Série F-121/2000, IMPA, Rio de Janeiro, BrazilAbdón, M., Torres, F., On maximal curves in characteristic two (1999) Manuscr. Math., 99, pp. 39-53. , Zbl 0931.11022Accola, R.D.M., On Castelnuovo's inequality for algebraic curves, I (1979) Trans. Am. Math. Soc., 251, pp. 357-373. , Zbl 0417.14021Arbarello, E., Cornalba, M., Griffiths, P.A., Harris, J., (1985) Geometry of Algebraic Curves, 1. , Springer-Verlag, New-York. Zbl 0559.14017Ballico, E., (2000) Space Curves Not Contained in Low Degree Surfaces in Positive Characteristic, , Preprint, MayCastelnuovo, G., Ricerche di geometria sulle curve algebriche (1889) Atti. R. Acad. Sci. Torino, 24, pp. 346-373. , JFM 21.0669.01Cossidente, A., Hirschfeld, J.W.P., Korchmáros, G., Torres, F., On plane maximal curves (2000) Compos. Math., 121, pp. 163-181. , Zbl 0958.11048Cossidente, A., Korchmáros, G., Torres, F., On curves covered by the Hermitian curve (1999) J. Algebra, 216, pp. 56-76. , Zbl pre01309249Cossidente, A., Korchmáros, G., Torres, F., Curves of large genus covered by the Hermitian curve (2000) Commun. Algebra, 28 (10), pp. 4707-4728. , Zbl 0974.11031Fuhrmann, R., Garcia, A., Torres, F., On maximal curves (1997) J. Number Theory, 67 (1), pp. 29-51. , Zbl 0914.11036Fuhrmann, R., Torres, F., The genus of curves over finite fields with many rational points (1996) Manuscr. Math., 89, pp. 103-106. , Zbl 0857.11032Fuhrmann, R., Torres, F., On Weierstrass points and optimal curves (1998) Rend. Circ. Mat. Palermo Suppl., 51, pp. 25-46. , Zbl pre01222881Garcia, A., Stichtenoth, H., Xing, C.P., On subfields of the Hermitian function field (2000) Compos. Math., 120, pp. 137-170. , Zbl 0990.11040Garcia, A., Torres, F., On maximal curves having classical Weierstrass gaps (1999) Contemp. Math., 245, pp. 49-59. , Zbl 1044.11053Van Der Geer, G., Van Der Vlugt, M., How to construct curves over finite fields with many points (1997) Sympos. Math., 37, pp. 169-189. , Arithmetic Geometry (Cortona 1994), F. Catanese (ed.), Cambridge Univ. Press, Zbl 0884.11027Goppa, V.D., Geometry and codes (1988) Mathematics and Its Applications, 24. , Kluwer Academic Publisher, Dordrecht-Boston-LondonHarris, J., The genus of space curves (1980) Math. Ann., 249, pp. 191-204. , Zbl 0449.14006Hartshorne, R., Algebraic geometry (1977) Graduate Texts in Mathematics, 52. , Springer-Verlag, New York-Berlin. Zbl 0367.14001Hefez, A., Non classical curves (1988) Atas 16 Coloquio Bras, de Matem., pp. 33-37Hefez, A., Non-reflexive curves (1989) Compos. Math., 69, pp. 3-35. , Zbl 0706.14024Hefez, A., Kakuta, N., On the geometry of non-classical curves (1992) Bol. Soc. Bras. Mat. Nova Sér., 23 (1-2), pp. 79-91. , Zbl 0782.14024Hefez, A., Kleiman, S., Notes on the duality of project varieties (1985) Geometry Today, Prog. Math., 60, pp. 143-183Hefez, A., Voloch, J.F., Frobenius non-classical curves (1990) Arch. Math., 54, pp. 263-273. , Zbl 0662.14016Hirschfeld, J.W.P., (1998) Projective Geometries over Finite Fields. 2nd Ed., , Oxford Claredon Press, Oxford. Zbl 0899.51002Homma, M., Reflexivity of tangent varieties associated with a curve (1990) Ann. Mat. Pura Appl. IV. 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On the turbulence induced by non-breaking surface waves
No full textUpper ocean turbulence is a very relevant process within the context of quantifying the exchange between the atmosphere and the ocean. We present results of a study of turbulence induced by non-breaking waves from detailed observation in a small wave tank facility in the Faculty of Marine Science of the University of Baja California. The experiments were carried out with mechanically generated monochromatic waves in a tank of approximately 12m x 0.5m x 0.3m with a varying steepness (ak) from about 0.02 to 0.18, and detailed measurements of the vertical profile of the 3d velocity field within a water column of about 0.035 m in length. Routine data quality control includes the use of only high beam correlation signal within each of the acoustic beams used by the profiler. A rotation matrix was applied to the velocity data matrix in order to secure that the x, y, and z axes were properly aligned with the wave tank. Rather low wave reflection was obtained through the implementation of a beach at the end of the wave tank. The intermittent character of the turbulence present is shown as a region following the -5/3 power law in the spectrum. Nevertheless, this spectral shape is being observed in most of our experimental results, particularly in those where the wave steepness was not too small. Root mean square values are obtained from the turbulent fluctuations time series to evaluate an integral quantity to characterize the turbulence intensity. This intensity is analyzed in terms of the wave steepness showing a linear relationship. The turbulent kinetic energy dissipation rate is also estimated and the relevance of the velocity spectra directly estimated over a limited number of wavenumber bands is addressed. This work represents a RugDiSMar Project (CONACYT 155793) contribution and support from CONACYT project CB-2011-01- 168173 is greatly appreciated
Consideraciones taxonómicas sobre Lithurgus sublaevis PÉREZ 1897 y Lithurgus chrysurus FONSCOLOMBE 1834 (Hymenoptera, Apoidea, Megachilidae)
No full textF.J, Ornosa, C., Torres, F. (2007): Consideraciones taxonómicas sobre Lithurgus sublaevis PÉREZ 1897 y Lithurgus chrysurus FONSCOLOMBE 1834 (Hymenoptera, Apoidea, Megachilidae). Linzer biologische Beiträge 39 (1): 111-116, DOI: 10.5281/zenodo.540549
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