Results 131 to 140 of about 129,126 (304)

A fractional generalization of the Lauwerier formulation of the temperature field problem in oil strata Una generalización fraccional de la formulación Lauwerier para los problemas de las temperaturas en pozos petroleros

open access: yesRevista Técnica de la Facultad de Ingeniería, 2007
In the present paper we give a fractional generalization of the Lauwerier formulation of the boundary value problem of the temperature field in oil strata.
Mridula Garg
doaj  

Theoretical framework for soft X‐ray Fourier transform spectroscopy using the Wigner function

open access: yesJournal of Synchrotron Radiation, EarlyView.
A theoretical framework for the propagation of partially coherent Gaussian radiation in a modified Mach–Zehnder interferometer designed for Fourier transform spectroscopy applications is presented.This work presents a theoretical framework for the propagation of partially coherent Gaussian radiation in a modified Mach–Zehnder interferometer designed ...
Chuzida Chen   +6 more
wiley   +1 more source

Exploring oxide quasicrystals in internal space

open access: yesActa Crystallographica Section A, EarlyView.
The internal space expansion with variable system size is investigated for three different oxide quasicrystal systems. Patches of 7800, 4800 and 3600 vertices are examined in Ba–Ti–O/Pt(111), Eu–Ti–O/Pd(111) and Sr–Ti–O/Pd(111), respectively. This internal space inspection provides unique structural information for quasicrystalline systems, which goes ...
Sebastian Schenk   +3 more
wiley   +1 more source

Fading memory and the convolution theorem

open access: yesIEEE Transactions on Automatic Control
Several topological and analytical notions of continuity and fading memory for causal and time-invariant filters are introduced, and the relations between them are analyzed. A significant generalization of the convolution theorem that establishes the equivalence between the fading memory property and the availability of convolution representations of ...
Ortega, Juan-Pablo, Rossmannek, Florian
openaire   +2 more sources

Why Is Exclusivity in Broadcasting Rights Prevalent and Why Does Simple Regulation Fail?

open access: yesThe RAND Journal of Economics, EarlyView.
ABSTRACT Pay‐TV firms compete both downstream to attract viewers and upstream to acquire broadcasting rights. Because profits inherited from downstream competition satisfy a convexity property, allocating rights to the dominant firm maximizes the industry profit.
David Martimort, Jerome Pouyet
wiley   +1 more source

An extension of Suffridge's convolution theorem

open access: yesJournal of Mathematical Analysis and Applications, 2010
The author gives the following definitions: (i) For \(\lambda\in[0,\frac{2\pi}{n}]\), let \(\mathcal{P}_n(\lambda)\) denote the set of polynomials \(P\) of degree \(n\) that have all their zeros on the unit circle and such that each pair of zeros is separated by an angle of at least \(\lambda\).
openaire   +1 more source

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