SciELO - Scientific Electronic Library Online (52.285 recursos) SciELO (Scientific Electronic Library Online) is an electronic library covering a selected collection of Brazilian scientific journals. The objective of the site is to implement an electronic virtual library, providing full access to a collection of serial titles, a collection of issues from individual serial titles, as well as to the full text of articles. The project envisages the development of a common methodology for the preparation, storage, dissemination and evaluation of scientific literature in electronic format.
Mostrando recursos 1 - 20 de 26
1. Finding the closest Toeplitz matrix - Eberle,Maria Gabriela; Maciel,Maria Cristina The constrained least-squares n × n-matrix problem where the feasibility set is the subspace of the Toeplitz matrices is analyzed.
2. A weighted projection centering method - Moretti,Antonio Carlos An iterative method for finding the center of a linear programming polytope is presented.
3. On the convergence properties of the projected gradient method for convex optimization - Iusem,A. N. When applied to an unconstrained minimization problem with a convex objective, the steepest descent method has stronger convergence properties than in the noncovex case: the whole sequence converges to an optimal solution under the only hypothesis of existence of minimizers (i.e.
5. Optimal design of a plate of variable thickness: a variational approach in dimension one - Pedregal,Pablo; Donoso,Alberto For a typical design problem of a plate of variable thickness, we analyze the one-dimensional situation through a variational reformulation to discover that, in contrast with the higher dimensional case, there are optimal solutions.
6. Generalized line criterion for Gauss-Seidel method - Garcia,M.V.P.; Humes Jr.,C.; Stern,J.M. a sufficient condition based on the absolute value of the matrix coefficients, for the convergence of Gauss-Seidel method (GSM) for a square system of linear algebraic equations, the Generalized Line Criterion (GLC).
11. Bounds for the subsistence of a problem of heat conduction - Barrea,Andrés; Turner,Cristina In this paper, we consider a slab represented by the interval 0 < x < 1, at the initial temperature u0(x) > 0 and having a heat flux q(t) on the left face and a nonlinear condition on the right face x = 1.
13. Alternant and BCH codes over certain rings - Andrade,A.A.; Interlando,J.C.; Palazzo Jr.,R. Alternant codes over arbitrary finite commutative local rings with identity are constructed in terms of parity-check matrices.
15. Fuzzy Ostrowski type inequalities - Anastassiou,George A. We present optimal upper bounds for the deviation of a fuzzy continuous function from its fuzzy average over [a,b] Ì R, error is measured in the D-fuzzy metric.
18. Infinite horizon differential games for abstract evolution equations - Shaiju,A.J. Berkovitz's notion of strategy and payoff for differential games is extended to study two player zero-sum infinite dimensional differential games on the infinite horizon with discounted payoff.
19. Steam injection into water-saturated porous rock - Bruining,J.; Marchesin,D.; Van Duijn,C.J. We formulate conservation laws governing steam injection in a linear porous medium containing water.
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, with q0 > 0, for any value of the Luikov number Lu is obtained.