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Mostrando ítems 181-189 de 189
Artículo
Endpoint estimates for commutators of singular integral operators
(Elsevier, 1995-02-15)
We prove endpoint estimates for commutatotrs of singular integrals with BMO functions. We first show that they satisfy L(log L) type inequalities and then that there is a Hardy space type estimate where the usual atomic ...
Artículo
Analysis of the Evans and Baranyai variational principle in dilute gases
(American Physical Society, 1993)
A variational principle for thermostated nonequilibrium steady states recently proposed by Evans and Baranyai [Phys. Rev. Lett. 67, 2597 (1991)] is analyzed by means of a model kinetic equation for dilute gases. It is shown ...
Artículo
Two-weight, weak-type norm inequalities for singular integral operators
(International Press, 1999)
We give a sufficient condition for singular integral operators and, more generally, Calder´on-Zygmund operators to satisfy the weak (p, p) inequality u({x ∈ R n : |T f(x)| > t}) ≤ C / tp Z Rn |f|p v dx, 1 < p < ∞. Our ...
Artículo
Amino acid transport systems required for diazotrophic growth in the cyanobacterium Anabaena sp. strain PCC 7120
(American Society for Microbiology, 1995)
Uptake of 16 amino acids by the filamentous, heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120 was characterized with regard to kinetic parameters of transport, intracellular accumulation of the transported ...
Artículo
Dynamics of single and multiple Zener transitions
(American Institute of Physics Publising LLC, 1992)
The probability of remaning in a given state is evaluated for a two-level system that can cross repeatedly and periodically as a function of a control parameter. The possibility of multiple Zener transitions between the ...
Artículo
Identification and effects of anthropogenic emissions of U and Th on the composition of sediments in a river/estuarine system in Southern Spain
(Elsevier, 1994)
A study of the distribution of natural radionuclides in different fractions of river bottom sediments has been carried out. The study has shown that the majority of the total U in the sediment is located in the non-residual ...
Artículo
Hartree-Bose mean-field approximation for the interacting boson model (IBM-3)
(American Physical Society, 1998-02-01)
A Hartree-Bose mean-field approximation for the IBM-3 is presented. A Hartree-Bose transformation from spherical to deformed bosons with charge-dependent parameters is proposed which allows bosonic pair correlations and ...
Artículo
On the Validity of a Variational Principle for Far-from-Equilibrium Steady States
(IOP Publishing Ltd., 1995-03-20)
It is shown that an exact solution of the non-linear Boltzmann equation does not verify the variational principle for non-equilibrium steady states proposed by Evans and Baranyai (Phys. Rev. Lett., 67 (1991) 2597). Therefore, ...
Artículo
Analysis of meson exchange and isobar currents in (e,e′p) reactions from 16O
(American Physical Society, 1999-07-01)
An analysis of the effects of meson exchange and isobar currents in exclusive (e,e′p) processes from 16O under quasifree kinematics is presented. A model that has probed its feasibility for inclusive quasielastic (e,e′) ...