检索结果-南通市图书馆

Hil.ert Space of Probabil.ty Density Functions Based on Aitchison Geometry

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,Engl.sh Series 2006年第4期22卷 1175-1182页

作者： J.J.EGOZCUE J.l.diaz-BARREro V.PAWl.WSKY-Gl.HN Appl.ed Mathematics Ⅲ Universitat Politàcnica de CatalunyaJordi Girona 1-3C208034BarcelonaSpain Appl.ed Mathematics Ⅲ Universitat Politàcnica de CatalunyaJordi Girona 13C208034BarcelonaSpain Informatics and Appl.ed Mathematics Universitat de GironaCampus MontiliviP417071GironaSpain

The set of probabil.ty functions is a convex subset of l. and it does not have a l.near space structure when using ordinary sum and mul.ipl.cation by real.constants. Moreover, difficul.ies arise when deal.ng with distances between densities. The crucial.point is that usual.distances are not invariant under rel.vant transformations of densities. To overcome these l.mitations, Aitchison＇s ideas on compositional.data anal.sis are used, general.zing perturbation and power transformation, as wel. as the Aitchison inner product, to operations on probabil.ty density functions with support on a finite interval. With these operations at hand, it is shown that the set of bounded probabil.ty density functions on finite interval. is a pre-Hil.ert space. A Hil.ert space of densities, whose l.garithm is square-integrabl., is obtained as the natural.compl.tion of the pre-Hil.ert space.

关键词： Bayes' theorem Fourier coefficients Haar basis Aitchison distance Simpl.x l.ast squares approximation

Changes in Ol.en P in Rel.tion to P Bal.nce in Contrasting Agricul.ural.Soil.

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2016年第5期26卷 636-642页

作者： Isabel.diaz Jose TORRENT Departamento de Ingeniería Aeroespacial.y Mecánica de Fl.idos Escuela Tdcnica Superior de Ingeniería Agronómica(ETSIA)Universidad de SevillaCtra de Utrera km 141013 Sevilla(Spain) Departamento de Agronomia Universidad de CordobaEdificio C4Campus de Rabanales14071 Cordoba(Spain)

Maintaining soil.phosphorus （P） at adequate l.vel. for pl.nt growth requires assessing how the l.ng-term P bal.nce （viz., the difference between P inputs and outputs） resul.s in changes in soil.test P. The hypothesis that routinel. measured soil.properties can hel. predict the conversion factor of P bal.nce into Ol.en P was tested at 39 sites in agricul.ural.areas of the Mediterranean region in Spair~. A set of soil.sampl.s from each site was anal.zed for Ol.en P, inorganic P （P extracted using 0.5 mol.l.1 H2SO4）, pseudototal.P （P extracted using 0.5 mol.l.1 H2SO4 fol.owing ignition at 550 ~C）, and organic P （the difference between pseudototal.P and inorganic P）. Organic and Ol.en P were uncorrel.ted in most of the 39 soil.sets, which suggests that organic P content changed l.ttl. with P inputs and outputs. The sl.pes of the regression l.nes of Ol.en P against pseudototal.and inorganic P, which were used as two different measures of the conversion factor, ranged widel. （from 0.03 to 0.25 approximatel.）, with their average val.es （about 0.10） being simil.r to those found in l.ng-term experiments conducted in temperate areas. Neither conversion factor was significantl. correl.ted with any routinel. measured soil.property; however, the conversion factor for inorganic P was significantl. l.wer for calcareous soil. than for noncalcareous soil.. Our negative resul.s suggest the need to isol.te the infl.ence of soil.properties from that of management systems and environmental.factors rel.ting to P dynamics in future studies.

关键词： calcareous soil. conversion factor inorganic P noncalcareous soil. organic P pseudototal.P soil.property soil.test P

Inversion of el.ctrical mobil.ty measurements using bipol.r or unipol.r chargers for the arbitrary distribution of channel.

在线全文

学校读者我要写书评

暂无评论

Particuol.gy 2015年第3期13卷 114-123页

作者： M.Domat F.E.Kruis N.l.Azong-Wara J.M.Fernandez-diaz Department of Physics University of OviedoC/Calvo Sotelos/nE-33007 OviedoSpain Institute of Technol.gy for Nanostructures(NST) and Center for Nanointegration Duisburg-Essen(CENIDE) University of Duisburg-EssenBismarckstr.81D-47057 DuisburgGermany

The inversion of the particl. size distribution from el.ctrical mobil.ty measurements is anal.zed. Three different methods are adapted for a dot-matrix approach to the probl.m, especial.y for non-square or singul.r matrices, and appl.ed to el.ctrical mobil.ty measurements from fixed or scanning vol.ages. Mul. tipl. charged particl.s, diffusion l.sses, arbitrary vol.age steps and noise were considered, which resul.s in non-adjoining and overl.pping transfer functions. The individual.contribution of the transfer func- tions in each size interval.was geometricall. estimated, which requires onl. its characteristic mobil.ties. The methodol.gy is appl.ed to mobil.ty measurements from particl.s charged with unipol.r and bipol.r chargers. However, the method can be extrapol.ted to any charging method with a defined charge distribution, and retrieval.of the singl. charged particl. distribution and mean charge from a tandem differential.mobil.ty anal.sis configuration was successful.y demonstrated.

关键词： Tandem differential.mobil.ty anal.sisInverse probl.mRegul.rization methodsSize distributionTransfer functionUnipol.r charger

Sol.d-state synthesis of l.OCl.l._2O_3(l.=Eu, Nd) by using chitosan and PS-co-P4VP as pol.meric supports

在线全文

学校读者我要写书评

暂无评论

Journal.of Rare Earths 2018年第12期36卷 1326-1332页

作者： C.diaz D.Carril.o R.de l. Campa A.Presa Soto M.l.Val.nzuel. Departamento de Quimica Facultad de Quimica Universidad de Chile Departamento de Quimica Organica e Inorganica (IUQOEM) Facultad de Quimica Universidad de Oviedo Universidad Autonoma de Chil. Facultad de Ingenieria Instituto de Ciendas Quimicas Aplicadas Inorganic Chemistry and Molecular Material Center

A series of l.nthanide material. of type l.OCl.or l.2O3(l. = Eu, Nd) were successful.y prepared via a convenient and straightforward two-step procedure. Firstl., and by using chitosan and PS-co-P4 VP as pol.meric supports, macromol.cul.r compl.xes of type chitosan ·l.Cl.and PS-co-P4 VP·l.Cl. were prepared. These macro mol.cul.r compl.xes were treated in sol.d state at 800 ℃ under air, l.ading to the corresponding l.OCl.or l.2O3material.(l. = Eu, Nd) with moderate to good yiel.s. The nature of the asprepared l.nthanide material.(l.OCl.and/or l.2O3) is strongl. infl.enced by the pol.meric templ.te(i.e.,chitosan or PS-co-P4 VP), the l.nthanide sal. precursor, and the pol.mer/l.nthanide mol.r ratio. Thus, when chitosan · EuCl.and PS-co-P4 VP·EuCl.are used as macromol.cul.r precursors, a mixture of crystal.ine phases of both EuOCl.and Eu2O3are obtained. However, when chitosan· NdCl.and PS-co-P4 VP· NdCl.are used, a sol. pure crystal.ine phase of NdOCl.is obtained. The nano structured l.nthanide material. were characterized by means of XRD(X-ray diffraction of powder), SEM, EDS, TEM, and HRTEM. The l.minescent spectra of the asprepared EuOCI/Eu2O3mixture material. show an emission pattern whose intensity is strongl. infl.enced by the nature of the pol.meric precursor, as wel. as on the metal.pol.mer mol.r ratios.

关键词： EuOCl.Eu_2O_3 NdOCl Sol.entl.ss method l.minescence l.nthanides Rare earths

Anal.tical Sol.tion for Waves Propagation in Heterogeneous Acoustic/Porous Media. Part I: The 2D Case

在线全文

学校读者我要写书评

暂无评论

Communications in Computational.Physics 2010年第3期7卷 171-194页

作者： Jul.en diaz Abdel.aziz Ezziani Project-team Magique-3D INRIA Bordeaux Sud-Ouest l.A Pau CNRS UMR 5142I.P.R.A-Universit´e de Pau et des Pays de l’Adouravenue de l’Universit´e BP 1155-64013 PAU CEDEXFrance

Thanks to the Cagniard-de Hoop’s method we derive the sol.tion to theprobl.m of wave propagation in an infinite bil.yered acoustic/poroel.stic media, wherethe poroel.stic l.yer is model.ed by the biphasic Biot’s model. This first part is dedi-cated to sol.tion to the two-dimensional.probl.m. We il.ustrate the properties of thesol.tion, which wil. be used to val.date a numerical code.

关键词： Biot’s model poroel.stic waves acoustic waves acoustic/poroel.stic coupl.ng ana-l.tical sol.tion Cagniard-de Hoop’s technique 2D

FedIDS:a federated cl.ud storage architecture and satel.ite image del.very service for buil.ing dependabl. geospatial.pl.tforms

在线全文

学校读者我要写书评

暂无评论

International.Journal.of Digital.Earth 2018年第7期11卷 730-751页

作者： J.l.Gonzal.z-Compean Victor J.Sosa-Sosa Arturo diaz-Perez Jesus Carretero Ricardo Marcel.n-Jimenez Cinvestav-Tamul.pas Ciudad VictoriaMexico ARCOS Research Group University Carlos IIIMadridSpain UAM Iztapal.pa CDMX and associated to InfotecMexico

Earth observation satel.ites produce l.rge amounts of images/data that not onl. must be processed and preserved in rel.abl. geospatial.pl.tforms but al.o efficientl. disseminated among partners/researchers for creating derivative products through col.aborative *** can face up this chal.enge in a cost-effective manner by using cl.ud ***,outages and viol.tions of integrity/confidential.ty associated to this technol.gy coul. *** articl. presents FedIDS,a suite of cl.ud-based components for buil.ing dependabl. geospatial.*** Fed component enabl.s organizations to buil. shared geospatial.data infrastructure through federation of independent cl.ud resources to withstand outages,whereas IDS avoids viol.tions of integrity/confidential.ty of images/data in sharing information and col.aboration workfl.ws.A FedIDS prototype,depl.yed in Spain and Mexico,was eval.ated through a study case based on a satel.ite imagery captured by a Mexican antenna and another based on a satel.ite imagery of a European observation *** acquisition,storage and sharing of images among users of the federation,the exchange of images between Mexican and Spanish sites and outage scenarios were *** eval.ation reveal.d the feasibil.ty,rel.abil.ty and efficiency of FedIDS,in comparison with avail.bl. sol.tions,in terms of performance,storage consume and integrity/confidential.ty when sharing images/data in col.aborative scenarios.

关键词： Satel.ite imagery Earth observation archives spatial.data infrastructure col.aborative workfl.ws security rel.abil.ty

Thermodynamic Formul.tion of l.ving Systems and Their Evol.tion II

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal.of Modern Physics 2020年第9期11卷 1279-1300页

作者： l. F. del.Castil.o l. F. Martínez-Manzo V. l.vario-diaz Pol.mers Department Institute of Research in Materials Universidad Nacional Autónoma de México Mexico City Mexico Bristol.Centre for Functional.Nanomaterial. HH Wills Physics Laboratory University of Bristol Bristol UK School.of Chemistry University of Bristol Bristol UK

In the previous paper [1], the appl.cation of the general.thermodynamic theory was considered to biol.gical systems. The nature of l.ving matter has been presented from the mesoscopic to the macroscopic point of view,... 详细信息

In the previous paper l.nk">[1], the appl.cation of the general.thermodynamic theory was considered to biol.gical systems. The nature of l.ving matter has been presented from the mesoscopic to the macroscopic point of view, for different time scales (ontogenetic and phyl.genetics). Herein, we continue with this appl.cation, and present three characteristics of l.fe in the form of statements or postul.tes. The first characteristic describes the probabil.ty of survival.against aging. In particul.r, the behaviour of l.fe is shown as an independent mode of aging. The second characteristic refers to the adaptation of the species according to the environment. The rel.tionship between the phenomenon of organic homeostasis and the origin of the cl.nical parameters that define heal.h is highl.ghted. And final.y, the third characteristic appl.es the principl. of negentropy to describe evol.tion. A representative model.is given as an exampl. of each postul.te.

关键词： Thermodynamics of Biol.gical Systems Characteristics of l.fe Adaptation Surviving Probabil.ty Biol.gical Irreversibil.ty Negentropy

Hydrogen storage in a rare-earth perovskite-type oxide l._(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_3 for battery appl.cations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metal. 2018年第12期37卷 1003-1013页

作者： John Henao Oscar Sotel. Maura Casal.s-diaz l.renzo Martinez-Gomez CONACYT-CIATEQ A.C. Av. Manantiales 23-AParque Industrial Bernardo Quintana Instituto de Ciencias Fisicas (ICF) Universidad Nacional Autonoma de Mexico (UNAM)-Campus Morelos

Recentl., rare-earth perovskite-type oxides with the general.formul. ABO(A rare earth el.ment, B transition metal. O oxygen) are regarded as promising material. for Ni/oxide batteries due to their hydrogen storage abil.ty. In the present study, the hydrogen storage properties of the rare-earth perovskite-type oxide l.SrCoFeOwere eval.ated in al.al.ne sol.tion and at various temperatures. The hydrogen storage properties were investigated el.ctrochemicall. by appl.ing gal.anostatic charge/discharge currents. El.ctrochemical pressurecomposition-temperature isotherms were constructed using the Nernst equation. The exchange current density and proton hydrogen diffusion coefficient were calcul.ted using l.near pol.rization measurements and the potential.step method, respectivel.. Interestingl., the maximum hydrogen absorption capacity, re-calcul.ted from the el.ctrochemical capacity, is 1.72 wt% at 333 K and 6 mol.l.OH. In addition, the hysteresis val.e, calcul.ted from pressure-composition-temperature isotherms, was429 J·mol.t 333 K,whil. the sel.-discharge rate was about 25% after 24-h storage at open circuit and at 333 K.

关键词： Hydrogen storage Rare earths Perovskites Ni/oxide batteries

Nonl.near parabol.c predator-prey coupl.d system with convection

在线全文

学校读者我要写书评

暂无评论

International.Journal.of Biomathematics 2021年第2期14卷 83-118页

作者： Jose l.is diaz Pal.ncia Mariano Fernandez l.pez University Foundation San Pabl. CEU Spain

The aim of this work is to provide a formul.tion of two rel.ted nonl.near diffusive convective model. in the form of coupl.d reaction-absorption ***,the postul.ted model. are studied with an anal.tical *** on,numerical evidences are considered to account for a precise *** probl.m(P)anal.zed is of the form:ut=δΔu+c⋅∇u+v^(n),vt=ϵΔv+c⋅∇v−um,n,m∈(0,1),u_(0)(x),v_(0)(x)>0∈l.(1)_(l.c)(RN)∩l.(∞)(R^(N)).(0.1)Afterwards,a rel.ted probl.m P_(T)is studied:ut=δΔu+c⋅∇u−v^(n)(u−d),vt=ϵΔv+c⋅∇v−u^(m)v,n,m∈(0,1),u_(0)(x),v_(0)(x)>0∈l.(1)_(l.c)(R^(N))∩l.(∞)(R^(N)).(0.2)The principal.aspects for anal.sis are rel.ted to the existence and the derivation of particul.r sol.tions to reproduce the dynamic of the interacting *** the probl.m PT,we make use of the TW approach to study existence of sol.tions and precise evol.tion of *** that the term predator is used to refer to an invasive behavior,whil. the term prey is used for the invaded species.

关键词： Nonl.nearity reaction absorption coupl.d system diffusion,travel.ng waves