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- Delfim F. M. Torres3 profiles41 · h 65
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17 papers · 1 filter
Fischer decomposition by inframonogenic functions
Helmuth R. Malonek, Dixan Peña Peña, Frank Sommen
Let D denote the Dirac operator in the Euclidean space R^m. In this paper, we present a refinement of the biharmonic functions and at the same time an extension of the monogenic fu…
On the two-dimensional rotational body of maximal Newtonian resistance
Paulo D. F. Gouveia, Alexander Plakhov, Delfim F. M. Torres
We investigate, by means of computer simulations, shapes of nonconvex bodies that maximize resistance to their motion through a rarefied medium, considering that bodies are moving…
Long-term evolution of the spin of Mercury I. Effect of the obliquity and core-mantle friction
A. C. M. Correia, J. Laskar
The present obliquity of Mercury is very low (less than 0.1 degree), which led previous studies to always adopt a nearly zero obliquity during the planet's past evolution. However,…
Calculus of variations with fractional derivatives and fractional integrals
Ricardo Almeida, Delfim F. M. Torres
We prove Euler-Lagrange fractional equations and sufficient optimality conditions for problems of the calculus of variations with functionals containing both fractional derivatives…
On a conjecture of A. Magnus concerning the asymptotic behavior of the recurrence coefficients of the generalized Jacobi polynomials
A. Foulquie Moreno, A. Martinez-Finkelshtein, V. L. Sousa
In 1995 Magnus posed a conjecture about the asymptotics of the recurrence coefficients of orthogonal polynomials with respect to the weights on [-1,1] of the form $$ (1-x)^α(1+x)^β…
Development of high-gain gaseous photomultipliers for the visible spectral range
A. V. Lyashenko, A. Breskin, R. Chechik +3
We summarize the development of visible-sensitive gaseous photomultipliers, combining a semitransparent bi-alkali photocathode with a state-of-the-art cascaded electron multiplier.…