1,721,069 research outputs found
The tree model of a meromorphic plane curve
No full textWe associate with a plane meromorphic curve f a tree model T(f) based on its contact structure. Then we give a description of the y-derivative of f (resp. the Jacobian J(f, g)) in terms of T(f) (resp. T(f, g)). We also characterize the regularity of f in terms of its tree. © 2013 Springer-Verlag Italia.Abhyankar S. S., 1977, P INT S ALG GEOM KYO, P240; Abhyankar SS, 1999, P INDIAN AS-MATH SCI, V109, P117, DOI 10.1007-BF02841532; Assi A., 1999, MATH Z, V230, P16; Assi A, 1999, CR ACAD SCI I-MATH, V329, P625, DOI 10.1016-S0764-4442(00)80013-0; Barroso ERG, 2000, P LOND MATH SOC, V81, P1, DOI 10.1112-S0024611500012430; DELAMATA FD, 1994, COMPOS MATH, V92, P327; DELAMATA FD, 1994, LOND MATH S, V201, P61; KUO TC, 1977, TOPOLOGY, V16, P299, DOI 10.1016-0040-9383(77)90037-4; Maugendre H, 1998, ANN FS TOULOUSE, V7, P497; Maugendre H., J LONDON MATH SOC, V59, P207; Merle M., 1977, INVENT MATH, V41, P299; Wall C.T.C., 2004, LMS STUDENT TEXTS, V63; Zariski O., 1973, LECT CTR MATH ECOLE0
Computing irreducible curve singularities with Mathematica
No full textWe present an algorithm, implemented with the Mathematica package, that constructs the
irreducible curve singularities corresponding to a given semigroup
Excavator arms: Numerical, experimental and new concept design
No full textThe aim of this work is to design the arms of a specific excavator adopting unconventional materials and comparing the machine performance due to components lightweight. A real excavator is numerically studied under specific load conditions; subsequently a series of experimental tests were performed in order to quantify the dynamic effects induced by moving load. On the basis of the actions determined by the load diagram and the inertia ones, a structural evaluation was performed on the arms in their original configuration. The results obtained were assumed like minimum performance for new design components using aluminum alloy and composite material with carbon fibers instead of structural steel. The geometry developed by adopting the composite material has an elliptical section instead of a classical rectangular section. With the adoption of the new solutions there is a total weight reduction up to 64.1% for the solution made of composite materials
Toric modifications of free toric varieties
No full textGeometric properties of strict transforms of certain toric complete intersection varieties under toric blowups are studied. Let V=V(f_1,...,f_n−r) be a free complete intersection in A^n which is a simplicial affine toric variety with weight semigroup generated by n vectors [see J. C. Rosales and P. A. García-Sánchez, Semigroup Forum 58 (1999), no. 3, 367–385]. With the set {f_1 ,...,f_n−r} one associates a fan Σ(f_1,...,f_ n−r) with support R^n+. Each cone in Σ(f_1 ,...,f_ n−r) is defined as the set of all vectors a∈R^n+ such that the inner product (a,⋅) achieves its minimum on a given face of the Newton polyhedron of each f_i. The fan Σ(f_1 ,...,f_n−r) can be refined to a regular fan Σ. The latter fan defines the blowup morphism π:X=X(Σ)→A^n, which is isomorphic outside π^−1(V). The main result of the paper says that the strict transform of V is non-singular and transversal to the strata of the stratification of π^−1(0). This result can be viewed as a generalization of previous constructions of embedded resolutions of curve singularities [R. Goldin and B. Teissier, in Resolution of singularities (Obergurgl, 1997), 315–340, Progr. Math., 181, Birkhäuser, Basel, 2000] and of quasi-ordinary singularities
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
Effective construction of irreducible curve singularities
No full textBy using the effective notion of the approximate roots of a polynomial,
we describe the equisingularity classes of irreducible curve singularities
with a given Milnor number
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
Dataset on the use of metal hydroxides, instead of flue gas desulfurization residues, to stabilize fly ash by using bottom ash
Full text linkMunicipal solid waste incineration (MSWI) provides significant benefits on waste treatment technologies. Nevertheless some by-products such as fly ash (FA) and bottom ash (Ash) are produced in the incineration plant. Indeed, FA is considered a toxic waste due to the presence of leachable heavy metals (i.e Zn, Cd, Pb, Hg) and metalloid (like As). This data article aims to investigate the reactivity of Ca(OH)2 and Mg(OH)2 as possible substitute of flue gas desulfurization (FGD) residues by mixing with FA, BA and silica fume through a low cost technology. To assess the immobilization process of heavy metals and metalloid, three different samples' compositions were prepared for Ca(OH)2 and Mg(OH)2 series, respectively. Elemental chemical analysis of leaching solutions were carried out by Total reflection X-Ray Fluorescence spectroscopy (TXRF). Data revealed that mixing municipal solid waste ashes with Mg(OH)2 decrease significantly Pb and Zn leachability after two months, and reduce their environmental impact in landfill
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