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The ρ-variation of the Hermitian Riesz Transform

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Acta Mathematica Sinica,English Series 2010年第10期26卷 1827-1838页

作者： Raquel CRESCIMBENI Francisco Javier MARTíN-REYES Alberto DE lA TORRE josé l.torrea Departamento de Matemática Universidad Nacional del Comahue Facultad de Economía y Administración Departamento de Análisis Matemático Facultad de Ciencias Universidad de Málaga Facultad de Ciencias Universidad Autónoma de Madrid ICMAT-CSIC-UAM-UCM-UC3M

In this paper we prove the behaviour in weighted lp spaces of the oscillation and variation of the Hilbert transform and the Riesz transform associated with the Hermite operator of dimension 1. We prove that this operator maps lP（R, w（x）dx） into itself when w is a weight in the Ap class for 1 〈 p 〈 ∞. For p = 1 we get weak type for the A1 class. Weighted estimated are also obtained in the extreme case p = ∞.

关键词： Oscillation-p-variation-singular integral-Hermite operator

Fractional Square Functions and Potential Spaces, Ⅱ

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Acta Mathematica Sinica,English Series 2015年第11期31卷 1759-1774页

作者： Jorge J.BETANCOR Juan C.FARIA lourdes RODRIGUEZ-MESA Ricardo TESTONI jos l.torrea Departamento de Anlisis Matemtico Universidad de La Laguna Campus de Anchieta Avda.Astrofísico Francisco Snchez 38271 La Laguna (Sta.Cruz de Tenerife) Spain Departamento de Matemtica Universidad Nacional del Sur Avda. Alem 1253 8000 Bahía BlancaBuenos Aires Argentina Departamento de Matem'aticas Universidad Autónoma de Madrid ICMAT-CSIC-UAM-UCM-UC3MCiudad Universitaria de Canto Blanco 28049 Madrid Spain

In this paper, we study fractional square functions associated with the Poisson semigroup for SchrSdinger operators. We characterize the potential spaces in the SchrSdinger setting by using vertical, area and gλ, fra... 详细信息

关键词： g-function Schrodinger operator potential space

Weighted variation inequalities for differential operators and singular integrals in higher dimensions

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Science China Mathematics 2017年第8期60卷 1419-1442页

作者： MA Tao torrea jose l. XU QuanHua School of Mathematics and Statistics Wuhan University Departamento de Matemticas Universidad Autónoma de Madrid Institute for Advanced Study in Mathematics Harbin Institute of Technology laboratoire de Mathematiques Universite de Franche-Comte Institut Universitaire de France

We prove weighted q-variation inequalities with 2lar integral operators in higher *** vector-valued extensions of these inequalities are also *** results are proven for differential ... 详细信息

We prove weighted q-variation inequalities with 2lar integral operators in higher *** vector-valued extensions of these inequalities are also *** results are proven for differential operators.

关键词： variation inequalities A_(p) weights differential operators singular integrals vector-valued variationin equalities

OSCIllATION AND VARIATION OF THE lAGUERRE HEAT AND POISSON SEMIGROUPS AND RIESZ TRANSFORMS

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Acta Mathematica Scientia 2012年第3期32卷 907-928页

作者： J.J.Betancor R.Crescimbeni J.l.torrea Departamento de An'aisis Matema'ico Universidad de La Laguna38271-La LagunaTenerifeIslas CanariasSpain Departamento de Matema'ica Universidad Nacional del ComahueBuenos Aires 14008300 Neuqu'enArgentina Departamento de Matem'aticas Facultad de CienciasUniversidad Auto'noma de Madrid28049 MadridSpain

In this article, we study lP-boundedness properties of the oscillation and vari- ation operators for the heat and Poissson semigroup and Riesz transforms in the laguerre settings. Also, we characterize Hardy spaces as... 详细信息

关键词： Oscillation variation heat laguerre semigroup Riesz transforms

Policy Iteration Algorithms for Zero-Sum Stochastic Differential Games with long-Run Average Payoff Criteria

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Journal of the Operations Research Society of China 2014年第4期2卷 395-421页

作者： joséDaniel lópez-Barrientos Faculty of Actuarial Sciences Universidad Ana´huacMe´xico NorteHuixquilucanMexico

This paper studies the policy iteration algorithm(PIA)for zero-sum stochastic differential games with the basic long-run average criterion,as well as with its more selective version,the so-called bias *** system is assumed to be a nondegenerate *** use lyapunov-like stability conditions that ensure the existence and boundedness of the solution to certain Poisson *** also ensure the convergence of a sequence of such solutions,of the corresponding sequence of policies,and,ultimately,of the PIA.

关键词： Ergodic payoff criterion Zero-sum stochastic differential games Policy iteration algorithm Nondegenerate diffusions Poisson equation Schäl convergence Bias game

Population structure and range expansion:the case of the invasive gastropod Cyclope neritea in northwest Iberian Peninsula

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Integrative Zoology 2012年第3期7卷 286-298页

作者： lucía COUCEIRO lúa lÓPEZ joséMiguel RUIZ Rodolfo BARREIRO Department of Ecology College of ScienceUniversity of A CoruñaA CoruñaSpain

Biotic invasions have a reputation for unpredictable ***,we report how slight changes in human activity responsible for the introduction and range expansion of a non-native mollusk have led to detectable differences in the genetics of the *** neritea is a non-predatory gastropod introduced to 2 areas of the European Atlantic:the northwest Iberian Peninsula(NWIP)and the French Atlantic coast(FAC).Shellfish seabed farming is intense in both areas but focuses on different commercial *** mitochondrial gene sequences,the lower genetic diversity recorded along the NWIP suggests a more homogeneous range of source populations than in the *** FAC,genetic diversity and haplotype composition in the NWIP correlate with the date of first occurrence of *** at each site rather than with geographical *** this pattern evokes the genetic signature expected under a serial-founder colonization model from a single initial enclave,a comparison with samples from potential source populations suggests that the NWIP probably experienced several independent *** jump dispersal pattern of *** in the NWIP,together with the observation that populations established in the same year are genetically undifferentiated,point to human transport as the most plausible explanation for the current range *** evidence for human-mediated dispersal,*** managed to develop a seemingly non-random genetic pattern in the *** is suggested that caution must be exerted when interpreting genetic patterns in invaders.

关键词： alien species Cyclope neritea cytochrome oxidase I genetic geographic pattern population structure

Carbon Dioxide/Methane Separation by Adsorption on Sepiolite

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Journal of Natural Gas Chemistry 2007年第3期16卷 235-243页

作者： josé A.Delgado María A.Uguina josé l.Sotelo Beatriz Ruíz Marcio Rosário Department of Chemical Engineering Universidad Complutense de Madrid28040Madrid.Spain

In this work, the use of sepiolite for the removal of carbon dioxide from a carbon dioxide/methane mixture by a pressure swing adsorption （PSA） process has been researched. Adsorption equilibrium and kinetics have been measured in a fixed-bed, and the adsorption equilibrium parameters of carbon dioxide and methane on sepiolite have been obtained. A model based on the lDF approximation has been employed to simulate the fixed-bed kinetics, using the langmuir equation to describe the adsorption equilibrium isotherm. The functioning of a PSA cycle for separating carbon dioxide/methane mixtures using sepiolite as adsorbent has also been studied. The experimental results were compared with the ones predicted by the model adapted to a PSA system. Methane with purity higher than 97% can be obtained from feeds containing carbon dioxide with concentrations ranging from 34% to 56% with the proposed PSA cycle. These results suggest that sepiolite is an adsorbent with good properties for its employment in a PSA cycle for carbon dioxide removal from landfill gases.

关键词： carbon dioxide methane sepiolite adsorption fixed-bed pressure swing adsorption

Global evolution of Equidae and Gomphotheriidae from South America

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Integrative Zoology 2014年第4期9卷 434-443页

作者： josél.PRADO María T.AlBERDI INCUAPA CONICET-UNICENNational University of Central Buenos Aires ProvinceOlavarríaArgentina Department of Paleobiology Museo Nacional de Ciencias NaturalesCSICMadridSpain

The contemporary South American mammalian communities were determined by the emergence of the Isthmus of Panama and by the profound climatic oscillations during the *** and gomphotheres were 2 very conspicuous groups of immigrant mammals from North America that arrived in South America during the *** present study compiles updated data on the phylogeny,systematics and ecology of both groups in South *** horses in South America are represented by 2 genera,Hippidion and Equus,as are the gomphotheres,represented by Cuvieronius and *** genera of horses include small(Hippidion devillei,***,*** and ***)and large forms(Equus neogeus and ***),which dispersed into South America using 2 different *** possible model for this dispersion indicates that the small forms used the Andes corridor,while larger horses dispersed through the eastern route and through some coastal *** the case of gomphotheres,Cuvieronius and Stegomastodon reached South America in 2 independent dispersal events,and Cuvieronius dispersed across the Andean corridor,while large Stegomastodon spread along the eastern *** and gomphotheres present values ofδ^(13)C from woodlands to C4 grass*** present lower values ofδ^(13)C than Equus in the late Pleistocene,whereas the gomphotheres diverge from value ofδ^(18)O,reflecting that Cuvieronius inhabited the Andean corridor and Stegomastodon dispersed through eastern *** gomphothere and horse species recorded in South America became extinct around the time that humans arrived.

关键词： Equidae Gomphotheriidae Plio-Pleistocene South America

A NEW APPROACH TO SOlVE SYSTEMS OF lINEAR EQUATIONS

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Journal of Computational Mathematics 2001年第4期19卷 445-448页

作者： V á squez, luis V á squez-Poletti, jos é l. Universidad Complutense 西班牙 E-28040 Universidad Pontificia Comillas 西班牙 E-28015

Presents a study which proposed an iterative approach to solve systems of linear equations. Definition of two families of convergent iterative methods; Features of the iterative method; Application of the method to a ... 详细信息

关键词： Iterative method linear systems Classical dynamics.