1,725,492 research outputs found
Compactação do operador ∂-Neumann
No full textEnvisioned in the fties by Spencer as an extension of Hodge theory to the non-compact complex setting, the L2-theory of the ∂-Neumann problem is one of the cornerstones of the intersection between several complex variables and partial differential equations. The goal of this dissertation is to provide an account on the compactness of the ∂-Neumann operator on global weighted spaces and on regular pseudoconvex domains.Idealizado por Spencer como uma extensão de teoria de Hodge para o contexto complexo não compacto, a teoria L2 do problema de Neumann para o operador ∂ é um dos pilares da interseção entre análise complexa em várias variáveis e equações diferenciais parciais. O objetivo desta dissertação é traçar uma análise da compacidade do operador de Neumann associado ao ∂ em espaços com peso globais e em domínios pseudoconvexos regulares
Force −∂V<SUB>xc</SUB>/∂r associated with the exchange-correlation potential V<SUB>xc</SUB>(r) in the neutral Ne atom
No full textFollowing an electrostatic interpretation of the force Fxc=−∂Vxc/∂r associated with the exchange-correlation potential Vxc(r), we present both analytical and numerical results for Fxc(r) in the Ne atom. The basic input is an existing quantum Monte Carlo (QMC) calculation of the ground-state electron density ρ(r) in this atom. The analytic form of ∂Vxc/∂r is in terms of the number of electrons Q(r) enclosed in a sphere of radius r centred on the nucleus, plus two phases needed to characterize the radial wavefunctions of density functional theory. Eigenvalue equations are presented for these phases, and used numerically. A brief discussion is added on the result of replacing the QMC ground-state density by its Hartree-Fock counterpart
Electrostatic interpretation of the force −∂V<SUB>xc</SUB>/∂r connected with the exchange-correlation potential: direct relation to single-particle kinetic energy density in Be-atom
No full textIn a recent study by one of us [Phys. Rev. A 65 (2002) 034501], an electrostatic interpretation has been proposed for the force −∂Vxc/∂r associated with the exchange-correlation potential energy Vxc(r) in a spherical atom such as Be or Ne. Here, this proposal is employed to relate −∂Vxc/∂r directly to (a) the exact ground-state density ρ(r) (e.g., from diffraction experiments or quantum Monte Carlo simulation) and its low-order derivatives, and (b) the single-particle kinetic energy density ts(r), calculated again from the exact ρ(r), for the example of the Be-atom. It would, of course, be important if this type of relation could be extended beyond a (1s)2(2s)2 two-level single-particle configuration
Uniform Estimates of Solutions with Weight Factors of -∂-Equations on Local q-Concave Wedges in C^n
No full textC.Laurent-Thiebaut&J.Leiterer^[15]研究C^n中局部q-凹楔形，得到了C^n中局部q-凹楔形的Cauchy-Riemann方程的解及一致估计，作者利用C.Laurent-Thiebaut&J.Leiterer^[15]的思想，得到C^n中局部q-凹楔形上带权因子的同伦公式和-∂--方程的带权因子解的一致估计。 全文分四章，主要是把C^n中局部凹楔形上-∂--方程解的一致估计推广到-∂--方程的带权因子解的一致估计. 第一章介绍了C^n中局部q-凹楔形上有关定义和基本引理，给出了Leray映射. 第二章构造...C.Laurent-Thiebaut & J.Leiterer^[15] studied local q-concave wedges in C^n.which obtained the homotopy formula and the estimates for the Cauchy-Riemann equation on q-concave wedges in C^n.By means of the ideas of C.Laursserent-Thiebaut & J.Leiterer^[15],the author obtains the homotopy formula with weight factors and uniform estimates of the solutions with eight factors of -∂-equations on l...学位：理学硕士院系专业：数学科学学院数学与应用数学系_基础数学学号：1902007115209
Characteristics of the study population according to the spherical equivalent (n = 8706).
No full textCharacteristics of the study population according to the spherical equivalent (n = 8706).</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
The Weighted Koppelman-Leray-Norguet Formula without Boundary Integrals in C^n and Uniform Estimates of Solutions with Weight Factors of ¯ ∂-Equations
No full text邱春晖[14]给出了C^n空间中具有非光滑边界的强拟凸多面体上的(0，q)型微分形式的带权因子的Koppelman-Leray-Norguet公式及其¯∂-方程带权因子的解.在此基础上，本文探究C^n空间中边界不必光滑的强拟凸域D上的积分表示，得到D上不含边界积分的带权因子的Koppelman-Leray-Norguet公式及¯∂-方程的带权因子的解，并对¯∂-方程带权因子的解进行一致估计. 全文分为三个部分: 第一章介绍了C^n空间中强拟凸域上的一些定义和记号，包括逐块C^(1)光滑边界，单形，以及重要的基本引理等. 第...Qiu Chunhui [14] gave the Koppelman-Leray-Norguet formula with weight factors of type (0,q) differential forms and solutions with weight factors of ¯ ∂-equations for a strictly pseudoconvex polyhedron with not necessarily smooth boundary in C^n. Based on it,the author studies in this paper the integral representations for a strictly pseudoconvex domain D with not necessarily smooth bo...学位：理学硕士院系专业：数学科学学院数学与应用数学系_基础数学学号：1902007115208
Variations on the Author
No full text“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
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