122,085 research outputs found
The Zinger deformation of differential equations with maximal unipotent monodromy
No full textIn this thesis, in the first part we study the Zinger deformation for the holomorphic solution of a differential equation with maximal unipotent monodromy. It is basically a generalization of the example made by Zinger, who used it to compute the reduced genus one Gromov-Witten invariants for the hypersurfaces. We define also a differential operator and we show that the action of the Zinger deformation is periodic under this operator. Then we give some structral properties of this deformation at zero. In the case of Calabi-Yau equation we give a connection of this deformation and the Yukawa coupling. Then we study the asymptotic expansion of the Zinger deformation at infinity and we give a perturbative expansion for it and furthermore we prove a conjecture made by Zagier about the logarithmic derivative of this perturbative expansion. We show that the th term of this logarithmic derivative, up to a simple factor is a polynomial of two variable, namely . Studying of these polynomials for the Zinger example is the aim of the second part. For these polynomials we give explicite formulas for the first and the second top coefficients (with respect to ) and in general for fixed we give a recursive formula to compute the th top coefficient of where varies. We show that these coefficients under a map belong to the image of elementary functions
L'allusion au lieu du dire : sa valeur autobiographique chez Montaigne
No full textZinger Ilana. L'allusion au lieu du dire : sa valeur autobiographique chez Montaigne. In: Cahiers de l'Association internationale des études francaises, 1997, n°49. pp. 171-185
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
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
A Direct Field Oriented Controller for Induction Motor Drives Using Tapped Stator Windings
No full textThe vanishing author in computer-generated works: a critical analysis of recent Australian case law
No full textAbstract
The use of software is ubiquitous in the creation of many copyright works, yet the requirement in copyright law that every work have a human author who engages in independent intellectual effort means that its use may prevent copyright subsistence. Several recent Australian cases have refocused attention on authorship as an essential criterion of copyright subsistence, and these cases suggest that much computer-produced output may be authorless and thus lack copyright protection. This article, the first in a two-part series, analyses how each case deals with the question of authorship of computer-produced works and why the use of software diminishes copyright protection for a significant number of computer-generated works. The article critiques the application of conventional notions of human authorship developed in the pre-computer age to modern productions and suggests alternative approaches to authorship that satisfy both the major objectives of copyright policy and the need to adapt to the computer age. The article argues that, without a broader judicial approach to authorship of computer-generated works, Parliament must remedy the lacuna in protection for these ‘authorless’ works. Possible solutions for reform are suggested. In a forthcoming article, the author comprehensively examines those reform proposals
An Unbiased Estimator of the Variance of Simple Random Sampling Using Mixed Random-Systematic Sampling
No full textSystematic sampling is a commonly used technique due to its simplicity and ease of implementation. The drawback of this simplicity is that it is not possible to estimate the design variance without bias. There are several ways to circumvent this problem. One method is to suppose that the variable of interest has a random order in the population, so the sample variance of simple random sampling without replacement is used. By means of a mixed random - systematic sample, an unbiased estimator of the population variance for simple random sample is proposed without model assumptions. Some examples are given.Variance estimator, systematic sampling, simple random sampling, random order.
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Some properties of hypergeometric series associated with mirror symmetry.
No full textThe paper is devoted to the investigation of properties of certain hypergeometric series used in string theory and algebraic geometry, particularly in the theory of the mirror symmetry for Calabi-Yau hypersurfaces in connection with the calculation of Gromov-Witten (GW) invariants of a quintic threefold and a Calabi-Yau projective hypersurface.\par The first prediction (1991) of the genus zero GW invariants of a quintic threefold was formulated in terms of the function of hypergeometric type \cal F (see below). It was mathematically verified five years later. The mirror-theoretical prediction (1993) of genus one GW invariants for the same quintic was verified in [\it A. Zinger, ``The reduced genus-one Gromov-Witten invariants of Calabi-Yau hypersurfaces", \urlarXiv:0705.2397v3], and a generalization to degree n hypersurfaces in \Bbb CP^n-1 for an arbitrary n proved in [\it A. Zinger, ``Standard vs. reduced genus-one Gromov-Witten invariants", \urlarXiv:0706.0715v3]. The proofs of these results use the properties of \cal F described in the paper under review. These properties may also be used for the computation of the higher genus GW invariants.\par Let \cal P\subset 1+x\Bbb Q(w)[[x]] be the subgroup of power series in x with constant term 1 whose coefficients are rational functions in w which are holomorphic at w=0.The following maps are defined: \cal P→ 1+x\Bbb Q[[x]],\quad F(w,x)\mapsto F(0,x), \bold M:\cal P→ \cal P,\quad\bold MF(w,x)=\bigg [1+\fracxw \frac\partial\partial x \bigg]\fracF(w,x)F(0,x). The function \cal F\in\cal P mentioned above has the form \cal F(w,x)= \sumd=0 ^ ∞ x^d \frac\prodr=1^r=nd(nw+r)\prodr=1 ^r=nd((w+r)^n-w^n), and it satisfies the relation \bold M^n\cal F=\cal F.\par The authors obtain a series of relations for \bold M^p\cal F(w,x) and Ip(x)=\cal Fp(0,x). Besides the asymptotic expansion for \cal F(w,x) is given: \cal F(w,x)∼ e^μ(x)w\sums=0^∞ \Phis(x) w^-s for w→∞ where μ=μ-1, \Phi0=e^μ0, \Phi1=\Phi0 μ1,\dots in \Bbb Q[[x]].\par For the coefficients μ(x), \Phi0(x) and \Phi1(x) the explicit formulas are given. For computing \Phis an algorithm of differential recursion is given. Some conjectural properties concerning higher genus GW invariants are stated
Dissipative Range Scaling of Higher Order Structure Functions for Velocity and Passive Scalars
No full textDifferently to Kolmogorov's second similarity hypothesis, we find that the 2n-th order velocity and scalar structure functions scale with n-th order moment of the energy dissipation and the scalar dissipation, respectively. The origins of this scaling are analyzed by the transport equations of the fourth order velocity and scalar increment moments and by direct numerical simulations
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