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Advances in Atmospheric Sciences 2007年第2期24卷 191-198页

作者： Laura DE LA TORRE Luis GIMENO Juan Antonio AEL raquel nieto Universidad de Vigo Facultad de Ciencias de Ourense 32004OurenseSpain

The North Atlantic Oscillation （NAO） is one of the leading modes of climate variability in the Northern Hemisphere. It has been shown that it clearly relates to changes in meteorological variables, such as surface temperature, at hemispherical scales. However, recent studies have revealed that the NAO spatial pattern also depends upon solar forcing. Therefore, its effects on meteorological variables must vary depending upon this factor. Moreover, it could be that the Sun affects climate through variability patterns, a hypothesis that is the focus of this study. We find that the relationship between the NAO/AO and hemispheric temperature varies depending upon solar activity. The results show a positive significant correlation only when solar activity is high. Also, the results support the idea that solar activity influences tropospheric climate fluctuations in the Northern Hemisphere via the fluctuations of the stratospheric polar vortex .

关键词： solar activity North Atlantic Oscillation Arctic Oscillation Northern Hemisphere surface temperature

Estimation of mean water vapour residence time during tropical cyclones using a Lagrangian approach

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Tropical Cyclone Research and Review 2022年第2期11卷 76-87页

作者： Albenis Perez-Alarcon Patricia Coll-Hidalgo Jose C.Fernandez-Alvarez raquel nieto Luis Gimeno Centro de Investigacion Marina Universidade de VigoEnvironmental Physics Laboratory(EPhysLab)OurenseSpain Departamento de Meteorología Instituto Superior de Tecnologías y Ciencias AplicadasUniversidad de La HabanaLa HabanaCuba Departamento de Meteorología Empresa Cubana de Navegacion AereaLa HabanaCuba

Tropical cyclone(TC)-related rainfall mostly depends on the atmospheric moisture uptake from local and remote *** this study,the mean water vapour residence time(MWVRT)was computed for precipitation related to TCs in each basin and on a global scale by applying a Lagrangian moisture source diagnostic *** to our results,the highest MWVRT was found for the TCs over the South Indian Ocean and South Pacific Ocean basins(~3.08 days),followed by the Western North Pacific Ocean,Central and East North Pacific Ocean,North Indian Ocean,and North Atlantic Ocean basins(which exhibited values of 2.98,2.94,2.85,and 2.72 days,respectively).We also found a statistically significant(p<0.05)decrease in MWVRT,at a rate of~2.4 h/decade in the North Indian Ocean and~1.0 h/decade in the remaining *** average,the MWVRT decreased during the 24 h before TCs made landfall,and the atmospheric parcels precipitated faster after evaporation when TCs moved over land than over the *** research should focus on the relationship between global warming and MWVRT of atmospheric parcels that precipitate over TC positions.

关键词： Tropical cyclones Water vapour residence time Lagrangian approach Tropical cyclones precipitation

Insights into the origin of precipitation moisture for tropical cyclones during rapid intensification process

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Tropical Cyclone Research and Review 2024年第2期13卷 72-87页

作者： Albenis Perez-Alarcon Jose C.Fernandez-Alvarez Ricardo M.Trigo raquel nieto Luis Gimeno Centro de Investigacion Mari~na Universidade de VigoEnvironmental Physics Laboratory(EPhysLab)Campus As Lagoas s/nOurenseSpain Departamento de Meteorología Instituto Superior de Tecnologías y Ciencias AplicadasUniversidad de La HabanaLa HabanaCuba Instituto Dom Luiz(IDL) Facultade de Ci^enciasUniversidade de LisboaLisboaPortugal Departamento de Meteorologia Universidade Federal do Rio de JaneiroRio de JaneiroBrazil

In this study,we identiﬁed the moisture sources for the precipitation associated with tropical cyclones(TCs)during the rapid intensiﬁcation(RI)process from 1980 to 2018 by applying a Lagrangian moisture source diagnostic *** detected sixteen regions on a global scale for RI events distributed as follows:four in the North Atlantic(NATL),two in the Central and East Paciﬁc Ocean(NEPAC),the North Indian Ocean(NIO)and South Indian Ocean(SIO),and three in the South Paciﬁc Ocean(SPO)and the Western North Paciﬁc Ocean(WNP).The moisture uptake(MU)mostly was from the regions where TCs underwent *** Western NATL,tropical NATL,Caribbean Sea,the Gulf of Mexico and the Central America and Mexico landmass supported~85.4%of the precipitating moisture in the NATL,while the latter source and the eastern North Paciﬁc Ocean provided the higher amount of moisture in NEPAC(~84.3%).The Arabian Sea,the Bay of Bengal and the Indian Peninsula were the major moisture sources in NIO,contributing approximately 81.3%.The eastern and western parts of the Indian Ocean supplied most of the atmospheric humidity in SIO(~83.8%).The combined contributions(~87.9%)from the western and central SPO and the Coral Sea were notably higher in ***,TCs in the WNP basin mostly received moisture from the western North Paciﬁc Ocean,the Philippine Sea and the China Sea,accounting for 80.1%.The remaining moisture support in each basin came from the summed contributions of the remote ***,RI TCs gained more moisture up to 2500 km from the cyclone centre than those slow intensiﬁcation(SI)and the total MU was approximately three times higher during RI than ***,the patterns of the MU differences respond to the typical pathways of moisture transport in each basin.

关键词： Tropical cyclones Rapid intensiﬁcation Moisture sources Precipitation Lagrangian moisture tracking

The complex Maxwell stress tensor theorem:The imaginary stress tensor and the reactive strength of orbital momentum.A novel scenery underlying electromagnetic optical forces

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Light(Science & Applications) 2022年第11期11卷 2655-2675页

作者： Manuel nieto-Vesperinas Xiaohao Xu Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones Cintificas.Campus de CantoblancoMadrid 28049Spain State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi'an 710119China Institute of Nanophotonics Jinan UniversityGuangzhou 511443China

We uncover the existence of a universal phenomenon concerning the electromagnetic optical force exerted by light or other electromagnetic waves on a distribution of charges and currents in general,and of particles in *** conveys the appearence of underlying reactive quantities that hinder radiation pressure and currently observed timeaveraged *** constitutes a novel paradigm of the mechanical effciency of light on matter,and completes the landscape of the optical,and generally electromagnetic,force in photonics and classical electrodynamics;widening our understanding in the design of both llumination and particles in optical manipulation without the need of increasing the illuminating power,and thus lowering dissipation and *** show that this may be accomplished through the minimization of what we establish as the reactive strength of orbital(or canonical)momentum,which plays against the optical force a role analogous to that of the reactive power versus the radiation effciency of an *** long time overlooked quantity,important for current progress of optical manipulation,and that stems from the complex Maxwell theorem of conservation of complex momentum that we put forward,as well as its alternating flow associated to the imaginary part of the complex Maxwell stress tensor,conform the imaginary Lorentz force that we introduce in this work,and that like the reactive strength of orbital momentum,is antagonistic to the well-known time-averaged force;thus making this reactive Lorentz force indirectly observable near wavelengths at which the time-averaged force is *** Minkowski and Abraham momenta are also addressed.

关键词： imaginary tensor orbital

CONTROLLABILITY AND OPTIMALITY OF LINEAR TIME-INVARIANT NEUTRAL CONTROL SYSTEMS WITH DIFFERENT FRACTIONAL ORDERS

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Acta Mathematica Scientia 2015年第5期35卷 1003-1013页

作者：丁小丽 Juan J.nieto Department of Mathematics Xi’an Polytechnic University Departamento de Análisis Matemático Facultad de MatemáticasUniversidad de Santiago de Compostela Department of Mathematics Faculty of Science King Abdulaziz University

Control systems governed by linear time-invariant neutral equations with different fractional orders are considered. Sufficient and necessary conditions for the controllability of those systems are established. The existence of optimal controls for the systems is given. Finally, two examples are provided to show the application of our results.

关键词： controllability optimality neutral equations different fractional orders

SOLVABILITY OF AN IMPLICIT FRACTIONAL INTEGRAL EQUATION VIA A MEASURE OF NONCOMPACTNESS ARGUMENT

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Acta Mathematica Scientia 2017年第1期37卷 195-204页

作者： Juan J.nieto Bessem SAMET Facultade de Matemáticas Universidade de Santiago de CompostelaSantiago de Compostela 15782Spain Faculty of Science King Abdulaziz UniversityJeddah 21589Saudi Arabia Department of Mathematics College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia

In this paper,we study the existence of solutions to an implicit functional equation involving a fractional integral with respect to a certain function,which generalizes the Riemann-Liouville fractional integral and the Hadaniard fractional *** establish an existence result to such kind of equations using a generalized version of Darbo＇s theorem associated to a certain measure of *** examples are presented.

关键词： umplicit fractional integral equation measure of noncompactness Darbo'stheorem

Aldynoglia cells and modulation of RhoGTPase activity as useful tools for spinal cord injury repair

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Neural Regeneration Research 2016年第7期11卷 1043-1045页

作者： Ernesto Doncel-Perez Manuel nieto-Sampedro Grupo de Quimica Neuro-Regenerativa Hospital Nacional de Paraplejicos Servicio de Salud de Castilla La Mancha (SESCAM) Toledo Spain Grupo de Plasticidad Neural Instituto Cajal CSIC Madrid Spain

A combined approach in spinal cord injury （SCI） therapy is the modulation of the cellular and molecular processes involved in glial scarring. Aldaynoglial cells are neural cell precursors with a high capacity to differentiate into neurons, promote axonal growth, wrapping and myelination of resident neurons. These important characteristics of aldaynoglia can be combined with specific inhibition of the RhoGTPase activity in astroglia and microglia that cause reduction of glial proliferation, retraction of glial cell processes and myelin production by oligodendrocytes. Previously we used experimental central nervous system （CNS） injury models, like spinal cord contusion and striatal lacunar infarction and observed that administration of RhoGTPase glycolipid inhibitor or aldaynoglial cells, respectively, produced a significant gain of functional recovery in treated animals. The combined therapy with neuro-regenerative properties strategy is highly desirable to treat SCI for functional potentiation of neurons and oligodendrocytes, resulting in better locomotor recovery. Here we suggest that treatment of spinal lesions with aldaynoglia from new rospheres plus local administration of a RhoGTPase inhibitor could have an additive effect and promote recovery from SCI.

关键词： glial scar astrocyte microglia neurospheres aldaynoglia axonal growth myelination glycosideinhibitor

Zigbee/Google Earth based assisted driving system in mining

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Mining Science and Technology 2009年第5期19卷 626-630页

作者： SUN En-ji nieto Antonio Department of Mining and Mineral Engineering University of Science and Technology Beijing Beijing 100083 China Department of Energy and Mineral Engineering Penn State University PA 16802 USA

The Assisted Driving System (ADS) for haul trucks operating in surface mining and construction sites is to reduce accidents related to low visibility conditions. This system is based on the GPS, Zigbee, and the Google-Earth engine as the graphic interface and mine-mapping server. The system has the capability to pin-point and track vehicles in real time using a 3D interface, which is based on user-based AutoCAD mine maps using the Google-Earth graphics interface. All equipped vehicles are shown in a 3D mine map stored in a local server through a wireless network. When low visibility conditions are present, the system indicates available exit/escape routes for driver safety. The ADS potentially increases reliability and reduces uncertainty in open pit mining operations.

关键词： 3D simulation GPS mining assisted driving system Google Earth

Existence and Uniqueness of Fixed Point in Partially Ordered Sets and Applications to Ordinary Differential Equations

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Acta Mathematica Sinica,English Series 2007年第12期23卷 2205-2212页

作者： Juan J.nieto RosanaRODRGUEZ-LPEZ Departamento de Análisis Matemático Facultad de MatemáticasUniversidad de Santiago de Compostela

We prove some fixed point theorems in partially ordered sets, providing an extension of the Banach contractive mapping theorem. Having studied previously the nondecreasing case, we consider in this paper nonincreasing mappings as well as non monotone mappings. We also present some applications to first-order ordinary differential equations with periodic boundary conditions, proving the existence of a unique solution admitting the existence of a lower solution.

关键词： fixed point partially ordered set first-order differential equation lower and upper solutions

EXISTENCE AND UNIQUENESS OF SOLUTIONS FOR NONLINEAR FRACTIONAL DIFFERENTIAL EQUATIONS WITH NON-SEPARATED TYPE INTEGRAL BOUNDARY CONDITIONS

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Acta Mathematica Scientia 2011年第6期31卷 2122-2130页

作者： Bashir Ahmad Juan J. nieto Ahmed Alsaedi Department of Mathematics Faculty of ScienceKing Abdulaziz University Departamento de Anlisis Matemtico Facultad de MatemticasUniversidad de Santiago de Compostela

In this paper, we study a boundary value problem of nonlinear fractional dif- ferential equations of order q （1 〈 q 〈 2） with non-separated integral boundary conditions. Some new existence and uniqueness results are obtained by using some standard fixed point theorems and Leray-Schauder degree theory. Some illustrative examples are also presented. We extend previous results even in the integer case q = 2.

关键词： fractional differential equations non-separated integral boundary conditions contraction principle Krasnoselskii's fixed point theorem LeraySchauder degree