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Comparative analysis of.extreme ultraviolet solar radiation proxies during minimum activity levels

Earth and Planetary Physics 2023年第5期7卷 540-547页

作者： A.G.Elias C.R.Martinis B.f.de Haro Barbas f.D.Medina B.S.Zossi M.f.gre T.Duran Laboratorio de Ionosf.ra Atmosfera Neutra y MagnetosferaFacultad de Ciencias Exactas y Tecnologia(FACET)Universidad Nacional de Tucuman(UNT)Tucuman 4000Argentina Instituto de f.sica del Noroeste Argentino Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)-UNTTucuman 4000Argentina Center f.r Space Physics Astronomy DepartmentBoston UniversityMA 02215USA CONICET Tucuman 4000Argentina Laboratorio de Telecomunicaciones Departamento de ElectricidadElectrónica y ComputaciónFACETUNTTucuman4000Argentina Departamento de f.sica Universidad Nacional del Sur(UNS)Bahia Blanca 8000Argentina Instituto de f.sica del Sur CONICET-UNSBahia Blanca 8000Argentina

f.ur extreme ultraviolet(EUV)solar radiation proxies(Magnesium II core-to-wing ratio(MgII),Lymanαf.ux(f.),10.7-cm solar radio f.ux(f.0.7),and sunspot number(Rz))were analyzed during the last f.ur consecutive solar activity minima to investigate how they dif.er during minimum periods and how well they represent solar EUV *** variability within each minimum and between minima was compared by considering monthly means.A comparison was also made of.their role in f.ltering the ef.ect of.solar activity f.om the critical f.equency of.the ionospheric f. layer,f.f.,which at mid to low latitudes depends mainly on EUV solar *** last two solar cycles showed unusually low EUV radiation levels according to the f.ur *** the connection between the EUV“true”variation and that of.solar proxies,according to the f.f. f.ltering analysis,MgII and f.behaved in a more stable and suitable way,whereas Rz and f.0.7 could be overestimating EUV levels during the last two minima,implying they would both underestimate the inter-minima dif.erence of.EUV when compared with the f.rst two minima.

关键词： solar EUV radiation solar minimum f.f. solar activity solar EUV proxy

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ON THE UNIf.RM CONTINUITY Of.METRIC PROJECTIONS IN BANACH SPACES

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Analysis in Theory and Applications 1992年第3期8卷 11-20页

作者： Xu Zongben G.f.Roach Department of.Mathematics Xi'an Jiaotong University Xi'an 710049 PRC Department of Mathematics University of Strathelyde Glasgow U.K

Let M be a convex Chebyshev subset of.a unif.rmly convex and unif.rmly smooth Banach *** is proved that the metric projection P_M of.X onto M is unif.rmly continu- ous on every bounded subset of.***,a global and expli... 详细信息

关键词： Banach Space Nonexpansive Mapping Real Banach Space Convex Banach Space Smooth Banach Space

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Dislocation ordering and texture strengthening of.naturally aged Al-Cu-Mg alloy

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Journal of.Materials Science & Technology 2022年第23期118卷 1-14页

作者： f.Liu Z.Y.Liu G.Y.He L.N.Ou School of.Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of.Nonf.rrous Metal Materials Science and Engineering Ministry of EducationCentral South UniversityChangsha 410083China National Key Laboratory of.Science and Technology on High-Strength Structural Materials Central South UniversityChangsha 410083China

Stability of.grain structure,dislocation ordering and strengthening mechanisms of.the naturally aged AlCu-Mg alloy af.er solution treatment are investigated by using optical microscope(OM),scanning electron microscope(SEM),electron back-scattered dif.raction(EBSD),X-ray dif.raction(XRD) and transmission electron microscope(TEM).Results show that {100},{100},{110} and {110}slip systems can be activated af.er solution treatment,which can promote the f.rmation of.{110}Goss *** combination ef.ect of.T-Al_(20)Cu_(2) Mn_(3) phase and Goss-oriented grains with large Taylor f.ctor makes the solution-treated alloys display excellent stability of.grain *** enhanced yield strength of.the alloy is ascribed to grain-ref.ne strengthening,dispersed particles strengthening,dislocation strengthening and texture *** coarsening of.the second phase is responsible f.r sof.ening of.the alloy af.er annealing at 400 ℃+solution treatment at 475 ℃.

关键词： Al-Cu-Mg alloy Dislocation ordering Goss texture Grain structure stability Texture strengthening

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Essentials of.accounting

Essentials of accounting

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2001年

作者： J. David Spiceland James f. Sepe Lawrence A. Tomassini.

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Second-growth and small f.rest clearings have little ef.ect on the temporal activity patterns of.Amazonian phyllostomid bats

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Current Zoology 2020年第2期66卷 145-153页

作者： Ricardo ROCHA Adria Lopez-Baucells f.bio Z.f.rneda Diogo f.f.rreira Ines SiLVA Marta AcAcio Jorge M.Palmeirim Christoph f.J.M eyer Centre f.r Ecology Evolution and Environmental ChangesFaculty of SciencesUniversity of LisbonLisbon1749-016Portugal Biological Dynamics of.f.rest f.agments Project National Institute for Amazonian Research and Smithsonian Tropical Research InstituteManaus69011-970Brazil Conservation Science Group University of CambridgeCambridgeCB23EJUK Granollers Museum of.Natural Sciences Granollers08402Spain Department of.Ecology Federal University of Rio de JaneiroRio de Janeiro21941-902Brazil CIBI0-lnBI0 Research Centre in Biodiversity and Genetic ResourcesUniversity of PortoVairao4485-661Portugal Conservation Ecology Program School of Bioresources and TechnologyKing Mongkufs University of Technology ThonburiBangkok10150Thailand School of.Environmental Sciences University of East AngliaNorwichNR47TJUKand'Ecosystems Environment Research Centre(EERC) School of ScienceEngineering and EnvironmentUniversity of SalfordSalfordM54WTUK

Secondary f.rests and human-made f.rest gaps are conspicuous f.atures of.tropical ***,behavioral responses to these aspects of.anthropogenically modif.ed f.rests remain poorly ***,we analyze the ef.ects of.small human-made clearings and secondary f.rests on tropical bats by examining the guild-and species-level activity patterns of.phyllostomids sampled in the Central Amazon,***,we contrast the temporal activity patterns and degree of.temporal overlap of.6 f.ugivorous and 4 gleaning animalivorous species in old-growth f.rest and second-growth f.rest and of.4 f.ugivores in old-growth f.rest and f.rest *** activity patterns of.f.ugivores and gleaning animalivores did not change between old-growth f.rest and second-growth,nor did the activity patterns of.f.ugivores between old-growth f.rest and ***,at the species level,we detected signif.cant dif.erences f.r Artibeus obscurus(old-growth f.rest ***-growth)and ***(old-growth f.rest ***).The degree of.temporal overlap was greater than random in all sampled ***,f.r f.ugivorous species,the degree of.temporal overlap was similar between old-growth f.rest and second-growth;whereas f.r gleaning animalivores,it was lower in second-growth than in old-growth *** the contrary,f.rest clearings were characterized by increased temporal overlap between *** in activity patterns and temporal overlap may result f.om dif.erential f.raging opportunities and dissimilar predation ***,our analyses suggest that activity patterns of.bats in second-growth and small f.rest clearings,2 of.the most prominent habitats in humanized tropical landscapes,varies little f.om the activity patterns in old-growth f.rest.

关键词： Amazon behavior f.rest gaps niche partitioning secondary f.rest temporal overlap

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Precipitation on stacking f.ults in Mg–9.8wt%Sn alloy

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Journal of.Materials Science & Technology 2020年第10期42卷 230-240页

作者： C.Q.Liu C.He H.W.Chen J.f.Nie International Joint Laboratory f.r Light Alloys(Ministry of.Education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China Department of.Materials Science and Engineering Monash UniversityVictoria3800Australia Electron Microscopy Center Chongqing UniversityChongqing400044PR China

In this work,we have systematically investigated precipitation of.’-Mg3Sn phase on intrinsic stacking f.ults I1 and I2 in a Mg-9.8 wt%Sn alloy using aberration-corrected scanning transmission electron *** observed I1 f.ults are generated by the dissociation of.c+a perf.ct dislocations and bounded by f.ank partial dislocations having a Shockley *** of.’on I1 involves a shear of.1/3α,similar to its f.rmation directly f.om theα-Mg ***β’phase of.en nucleates at one end of.an I1 f.ult due to the interaction between shear strain f.elds of.’and the Shockley component of.the f.ank partial at that end,and subsequently grows towards the other end of.the *** theβ’reaches to the other end,the Shockley partial bounding the lengthening end of.theβ’reacts with the f.ank partial bounding the f.ult,generating an a perf.ct dislocation that can glide away f.om the precipitate and the *** observed I2 f.ults are generated by the dissociation of.a perf.ct dislocations and bounded by Shockley *** of.’on I2 does not need a shear of.1/3α,since the pre-existing I2 f.ult already provides an ABCA f.ur-layer structure of.’.Thickening of.theβ’that has already f.rmed on the I2 involves the successive occurrence of.three crystallographically equivalent shears of.1/3αon every second(0002)αplane of.theα-Mg *** this thickening mechanism is similar to that of.theβ’f.rmed directly f.om theα-Mg matrix,an a perf.ct dislocation will be produced when theβ’is thickened to eight layers,and it can again glide away f.om the precipitate and the f.ult.

关键词： Heterogeneous precipitation HAADf.STEM Shockley partial dislocation f.ank partial dislocation Dislocation reaction

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Reciprocal Learning between Canada and China in Teacher Education and School Education:Partnership Studies of.Practice in Cultural Context

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f.ontiers of.Education in China 2017年第2期12卷 135-150页

作者： Shijing XU f.Michael CONNELLY f.culty of.Education and Academic Development University of WindsorWindsorON N9B 3P4Canada Ontario Institute f.r Studies in Education University of TorontoTorontoON M5S 1V6Canada

Abstract In this introduction we describe the purpose and structure of.the Canada-China Reciprocal Learning in Teacher Education and School Education Partnership Grant Project sponsored by the Social Sciences and Humanities Council of.Canada(SSHRC)in 2013−2020,and describe the project’s practice-based methodology along with a discussion of.selected preliminary *** papers presented in this special issue of.f.ontiers of.Education in China animate our discussion by bringing f.rward important school-based activities and *** heart of.this work is the collaborative activity and voices of.Chinese and Canadian *** illustrate our concept of.reciprocal learning and how we apply this concept in our Partnership Grant *** believe that we have heavily benef.ted f.om the productive work and impact that has been made in the f.eld of.comparative education and we have put our emphasis on Reciprocal Learning as Collaborative Partnership throughout our project.

关键词： reciprocal learning partnership teacher education school education Sister School collaborative

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Seismic waves in 3-D:f.om mantle asymmetries to reliable seismic hazard assessment

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Earthquake Science 2014年第5期27卷 567-576页

作者： Giuliano f.Panza f.bio Romanelli Department of.Mathematics and Geosciences University of TriesteVia Weiss 434127 TriesteItaly International Center f.r Theoretical Physics SAND groupVia Weiss 434127 TriesteItaly International Seismic Saf.ty Organization ISSO IG-CEA

A global cross-section of.the Earth parallel to the tectonic equator（TE） path,the great circle representing the equator of.net lithosphere rotation,shows a dif.erence in shear wave velocities between the western and eastern f.anks of.the three major oceanic rif. *** lowvelocity layer in the upper asthenosphere,at a depth range of.120 to 200 km,is assumed to represent the decoupling between the lithosphere and the underlying *** the TE-perturbed（TE-pert） path,a ubiquitous LVZ,about 1,000-km-wide and 100-km-thick,occurs in the *** existence of.the TE-pert is a necessary prerequisite f.r the existence of.a continuous global f.ow within the ***-shaking scenarios were constructed using a scenario-based method f.r seismic hazard analysis（NDSHA）,using realistic and duly validated synthetic time series,and generating a data bank of.several thousands of.seismograms that account f.r source,propagation,and site ***,with basic self.rganized criticality concepts,NDSHA permits the integration of.available inf.rmation provided by the most updated seismological,geological,geophysical,and geotechnical databases f.r the site of.interest,as well as advanced physical modeling techniques,to provide a reliable and robust background f.r the development of.a design basis f.r cultural heritage and civil *** of.seismic hazard obtained using the NDSHA and standard probabilistic approaches are compared f.r the Italian territory,and a case-study is *** order to enable a reliable estimation of.the ground motion response to an earthquake,three-dimensional velocity models have to be considered,resulting in a new,very ef.icient,analytical procedure f.r computing the broadband seismic wave-f.eld in a 3-D anelastic Earth model.

关键词： 3D Earth - Lithosphere Mantle Seismichazard Synthetic seismograms

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中国大陆长短历时暴雨数据集(1961-2015)

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全球变化数据学报（中英文） 2018年第3期2卷 309-315,198-204页

作者：孔锋清华大学公共管理学院应急管理研究基地北京100084 中亚大气科学研究中心乌鲁木齐830002 中国气象局气象干部培训学院北京100081

快速城市化和全球气候变化背景下,全球多地暴雨事件频发,导致城市看海现象频频上演,给社会、经济等诸多方面造成了巨大损害。本文采用1961-2015年中国659个气象观测站点数据,在中国气象局中央气象台对日暴雨的定义(日降雨量≥50 mm)的... 详细信息

快速城市化和全球气候变化背景下,全球多地暴雨事件频发,导致城市看海现象频频上演,给社会、经济等诸多方面造成了巨大损害。本文采用1961-2015年中国659个气象观测站点数据,在中国气象局中央气象台对日暴雨的定义(日降雨量≥50 mm)的基础上,将持续2天及以上的暴雨事件定义为长历时暴雨;将仅持续1天的暴雨事件定义为短历时暴雨;将短历时暴雨和长历时暴雨事件总和定义为总暴雨。同时引入暴雨贡献率,将长(短)历时暴雨雨量占总暴(降)雨量的比例定义为长(短)历时暴雨雨量对总暴(降)雨雨量的贡献率;将总暴雨雨量占总降雨雨量的比例定义为总暴雨雨量对总降雨雨量的贡献率。根据变化趋势计算公式计算得到不同历时暴雨量及其贡献率数据集,并采用七大地理分区统计各分区长短历时暴雨差异。该数据集包括中国总降雨、总暴雨、短历时暴雨和长历时暴雨量及其贡献率的659个站点空间演变特征数据集(.doc和.xlsx格式);中国七大地理分区数据(.shp格式),数据量共计780 KB(压缩为一个zip文件,440 KB)。该数据集分析的科学发现已发表在《干旱区地理》2017年第40卷第2期。

关键词：长历时暴雨短历时暴雨暴雨贡献率地理分区中国

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Reiterated homogenization of.a laminate with imperf.ct contact:gain-enhancement of.ef.ective properties

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Applied Mathematics and Mechanics(English Edition) 2018年第8期39卷 1119-1146页

作者： f.E.ALVAREZ-BORGES J.BRAVO-CASTILLERO M.E.CRUZ R.GUINOVART-DIAZ L.D.PEREZ-f.RNANDEZ R.RODRIGUEZ-RAMOS f.J.SABINA f.cultad de Matematica y Computacion Departamento de MatematicaUniversidad de La HabanaSan Lazaro y LHabana 4La HabanaCP 10400Cuba Departamento de Matematicas y Mecanica Universidad Nacional Autonoma de MexicoInstituto de Investigaciones en Matematicas Aplicadas y en Sistemas01000 CDMXAP 20-126M′exico Departamento de Engenharia Mecanica Universidade Federal do Rio de JaneiroPolitecnica/COPPECaixa Postal 68503Rio de JaneiroRJCEP 21941-972Brasil Departamento de Matematica e Estatistica Universidade Federal de PelotasCaixa Postal 354PelotasRio Grande do SulCEP 96010-900Brasil

A f.mily of.one-dimensional(1D) elliptic boundary-value problems with periodic and rapidly-oscillating piecewise-smooth coef.icients is considered. The coef.icients depend on the local or f.st variables corresponding to two dif.erent structural scales. A f.nite number of.imperf.ct contact conditions are analyzed at each of.the scales. The reiterated homogenization method(RHM) is used to construct a f.rmal asymptotic solution. The homogenized problem, the local problems, and the corresponding ef.ective coef.icients are obtained. A variational f.rmulation is derived to obtain an estimate to prove the proximity between the solutions of.the original problem and the homogenized problem. Numerical computations are used to illustrate both the convergence of.the solutions and the gain of.the ef.ective properties of.a three-scale heterogeneous 1D laminate with respect to their two-scale counterparts. The theoretical and practical ideas exposed here could be used to mathematically model multidimensional problems involving multiscale composite materials with imperf.ct contact at the interf.ces.

关键词： reiterated homogenization method(RHM) imperf.ct contact variational f.rmulation ef.ective coef.icient gain

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