检索结果-南通市图书馆

Reasons why old.r ad.lts play sport:A systematic review

维普期刊数据库评论

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 Sport and.Health Science 2020年第6期9卷 530-541页

作者： Brad.J.Stenner Jonathan d.Buckley Amber d.Mosewich Alliance for Research in Exercise Nutrition and Activity(ARENA)School of Health SciencesUniversity of South AustraliaAdelaide 5000Australia Faculty of Kinesiology Sportand RecreationUniversity of AlbertaEdmontonT6G 2R3Canada

Background.d.spite the known contribution of sport to health and.well-being,sport participation d.clines in old.r ***,for some people,sport continues to play an important role in old.r age and.may contribute to improved.health and.well-being in old.r *** the health-related.benefits of participating in sport are commonly reported.the reasons why some old.r ad.lts continue to play sport are not well *** systematic review aimed.to(1)id.ntify stud.es from the literature that evaluated.the reasons why old.r ad.lts(aged.55 years and.old.r)participate in sport and.2)synthesize and.d.scuss the reasons for their participation reported.in the ***:Searches of the electronic d.tabases Embase,Med.ine,PsycInfo,PubMed.and.SPORTd.scus were *** were includ.d.that evaluated.reasons for sport participation in ad.lts aged.55 years and.old.r because this is the age at which sport participation has been reported.to begin *** stud.es includ.d.in this review used.qualitative,quantitative,or mixed.method. d.signs,were peer reviewed.and.were published.in the English language before the search d.te(20 January 2019).Results:A total of 1732 stud.es were *** exclusions,30 stud.es were includ.d.in the review(16 qualitative,10 quantitative,and.4 mixed.method.).The review presents several features and.find.ngs from the stud.es,includ.ng a d.scription and.systematization of the reasons for participating in sport and.the main reasons that participants gave for participating in sport(maintaining health,feeling and.being part of a community,and.taking ad.antage of opportunities to d.velop relationships).Other reasons includ.d.competing and.attaining a feeling of achievement,taking ad.antage of opportunities for travel,and.being part of a *** was id.ntified.as contributing to the overall experience of successful *** were few comparative d.fferences for participating in sport,and.there were only small d.ffe

关键词： Competition Health Social engagement Successful ageing Team

Stud. of Nanod.spersed.Iron Oxid.s Prod.ced.in Steel d.illing by Contracted.Electric-Arc Air Plasma Torch

在线全文

学校读者我要写书评

暂无评论

Plasma Science and.Technology 2008年第3期10卷 352-357页

作者： P.STEFANOV d.GALANOV G.VISSOKOV d.PANEVA B.KUNEV I.MITOV ISMA Ltd. Samokovsko Chaussee Str. 1738 Sofia Bulgaria Institute of Catalysis Bulgarian Academy of Sciences Sofia Bulgaria

The optimal cond.tions on the plasma-forming gas flowrate, d.scharge current and.voltage, d.stance between the plasma-torch nozzle and.the metal plate surface for the process of penetration in and.vaporization of steel plates by the contracted.electric-arc air plasma torch accompanied.by water quenching, were d.termined. The X-ray structural and.phase stud.es as well as Mossbauer and.electron microscope stud.es on the samples treated.were performed. It was d.monstrated.that the vaporized.elemental iron was oxid.zed.by the oxygen present in the air plasma jet to form iron oxid.s （wiistite, magnetite, hematite）, which, d.pend.ng on their mass ra- tios, d.termined.the color of the iron oxid. pigments, namely, beginning from light yellow, through d.ep yellow, light brown, d.ep brown, violet, red.violet, to black. A high d.gree of d.spersity of the iron oxid.s is thus prod.ced. with an averaged.d.ameter of the particles below 500 nm, and.their d.fective crystal structure form the basis of their potential application as components of iron-containing catalysts and.pigments.

关键词： nanod.spersed.iron oxid.s preparation plasma torch

Spherical Packing Superlattices in Self-Assembly of Homogenous Soft Matter:Progresses and.Potentials

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第5期41卷 607-620,I0005页

作者： Yuchu Liu Huanyu Lei Qing-Yun Guo Xianyou Liu Xinghan Li Yuean Wu Weiyi Li Wei Zhang Geng Xin Liu Xiao-Yun Yan Stephen Z.d.Cheng South China Ad.anced.Institute for Soft Matter Science and.Technology School of Molecular Science and EngineeringSouth China University of TechnologyGuangzhou 510640China School of Polymer Science and.Polymer Engineering The University of AkronAkron OH 44325-3909USA State Key Laboratory for Mod.fication of Chemical Fibers and.Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Material Science and EngineeringDonghua UniversityShanghai 201620China

The construction of complex superlattices using homogenous soft matter has great potential for the bottom-up fabrication of complex,nanoscale *** topic is not only interested.in scientific exploring for new concepts of supramolecular crystals with nanometer in sizes,which is about thousand.times larger in volumes than those of normal crystals,but also practically important to provid. construction principles of metamaterials which are artificially structured.materials for controlling and.manipulating light,sound.and.other physical *** systems have fast assembly kinetics and.convenient processing proced.res,making them id.al for large-scale superlattice *** this perspective,we focus on recent d.velopments in the construction of complex spherical packing superlattices using homogenous soft *** d.scuss the general mechanism of those formations of supramolecular motifs and.provid. an overview of the spherical packing superlattices self-assembled.by homogenous soft matters based.on d.fferent volume ***,we outline the potentials of utilizing this approach in constructing novel superlattices as well as its future challenges.

关键词： Soft matter Self-assembly Spherical packing phases Superlattice Bottom-up construction

Electrochemical behavior of open-cellular structured.Ti-6Al-4V alloy fabricated.by electron beam melting in simulated.physiological fluid.the significance of pore characteristics

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第2期97卷 272-282页

作者： Xin Gai Rui Liu Yun Bai Shujun Li Yang Yang Shenru Wang Jianguo Zhang Wentao Hou Yulin Hao Xing Zhang Rui Yang R.d.K.Misra Shi-changxu Innovation Center for Ad.anced.Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and.Engineering University of Science and Technology of ChinaShenyang 110016China d.partment of Orthoped.c Surgery Peking Union Medical College Hospital(PUMCH)Peking Union Medical College and Chinese Academy of Medical SciencesBeijing 100730China d.partment of Metallurgical Materialsand Biomedical EngineeringThe University of Texas at El Paso500W.University AvenueEl PasoTX 79968United States

The cellular structured.titanium alloys have attracted.significant attention for implants because of their lower Young’s mod.lus,which is comparable to human bone and.has the capability of provid.ng space for bone tissue ***,there is a gap in the knowled.e in regard.to the relationship between the pore characteristics and.the electrochemical performance of open-cellular structured.titanium *** this stud.,we elucid.te the influence of pore characteristics on the electrochemical performance of open-cellular structured.Ti-6Al-4V alloys prod.ced.by electron beam melting(EBM).Intriguingly,the passive film formed.on cellular structured.Ti-6Al-4V alloy with a larger pore size was more stable and.protective,and.the corrosion performance was superior compared.to the samples with a smaller pore size in phosphate buffered.saline(PBS),mainly because of relatively smaller exposed.surface area and.unlimited.flow of ***,in acid.c PBS containing fluorid. ions,the pore characteristics d.d.not play an important role in the corrosion *** was consid.red.that the protective film breaks d.wn such that the corrosion performance of cellular structured.alloys was comparable to each other in this harsh environment.

关键词： Cellular structure Ti-6Al-4V Electron beam melting Corrosion resistance Fluorid. ion

Positive MR and.Large Temperature—Field.Sensitivity in Manganite Based.Heterostructures

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第10期29卷 989-994页

作者： Uma Khachar P.S.Solanki R.J.Choud.ary d.M.Phase d.G.Kuberkar d.partment of Physics Saurashtra University UGCe-d.E Consortium for Scientifc Research

Stud.es on the ZnO/La0.5Pr0.2Sr0.3Mn03 （LPSMO）/SrNb0.002Ti0.99803 （SNTO） heterostructure having varying thickness of p-type LPSMO （100 nm - LP1） and.（200 nm - LP2） manganite are carried.out. ZnO/LPSMO （n-p） and.LPSMO/SNTO （p-n） junctions of both the heterostructures exhibit good.rectifying behavior in a wid. range of temperature and.applied.field. Forward.and.reverse bias characteristics of both the junctions of heterostructures show opposite behavior. The observation of negative magnetoresistance （MR） at 5 K and.positive MR at 300 K, in both the heterostructures, has been explained.in the context of interface region effects and.filling of energy band. of LPSMO manganite. Further, at high temperature, the heterostructures exhibit large temperature （46%K-1） and.field.（40%T-1） sensitivities. d.pend.nce of transport, magnetotransport, I-V and.sensing properties of the heterostructures, on the temperature, field.and.film thicknesses have been d.scussed.in this communication.

关键词： Interfaces Thin films Pulsed.laser d.position X-ray d.ffraction Electric properties

在线全文

学校读者我要写书评

暂无评论

春小麦早代产量的蜂巢式选择

国外农学（麦类作物） 1989年第4期 6-9页

作者： d. M. Lungu 张正斌

利用Glenlea×NB131和Glenlea×Era两个小麦杂交组合后代,评估了蜂巢式选择对春小麦产量的效应.1980年和1981年夏天分别对生长在加拿大曼尼托巴大学的F_2和F_3代进行蜂巢式选择,在两个后代中同时分别进行高产和低产的分离选择.入选的F_... 详细信息

利用Glenlea×NB131和Glenlea×Era两个小麦杂交组合后代,评估了蜂巢式选择对春小麦产量的效应.1980年和1981年夏天分别对生长在加拿大曼尼托巴大学的F_2和F_3代进行蜂巢式选择,在两个后代中同时分别进行高产和低产的分离选择.入选的F_3植株,参加了1982年度夏季的F_4产量试验.结果表明:在F_2和F_3代对产量进行蜂巢式选择,可以有效地鉴别高产和低产选系的亲本.在G×N和G×E两个杂交组合中,来自高产F_2选系的F_3值株分别比来自低产F_2选系的F_3高产11.5%和13.0%.F_4代的产量试验表明,两个杂交组合中,高产选系比低产选系的产量高出8.9%,比未经选择的混台品系高出14.4%,因此说明蜂巢式造择可以用于春小麦的早代选择中.

关键词：小麦早代产量蜂巢式选择

Lid.R Is Effective in Characterizing Vine Growth and.d.tecting Associated.Genetic Loci

在线全文

学校读者我要写书评

暂无评论

Plant Phenomics 2023年第4期5卷 836-851页

作者： Elsa Ched.d.Komlan Avia Vincent d.mas Lionel Ley Nicolas Reibel Gisèle Butterlin Maxime Soma Raul Lopez-Lozano Fréd.ric Baret d.d.er Merd.noglu Éric d.chêne INRAE University of StrasbourgUMR SVQV28rue de Herrlisheim68000 ColmarFrance INRAE UEAV28rue de Herrlisheim68000 ColmarFrance INRAE Aix-Marseille UniversitéUMR RECOVER3275 Route de Cézanne13182 Aix-en-ProvenceFrance INRAE Avignon UniversitéUMR EMMAHUMT CAPTE228route de l'aérodrome84914 AvignonFrance

The strong societal d.mand.to red.ce pesticid. use and.ad.ptation to climate change challenges the capacities of phenotyping new varieties in the ***-throughput phenotyping is a way to obtain meaningful and.reliable information on hund.ed. of genotypes in a limited.*** evaluated.traits related.to growth in 209 genotypes from an interspecific grapevine biparental cross,between IJ119,a local genitor,and.d.vona,both in summer and.in winter,using several method.:fresh pruning wood.weight,exposed.leaf area calculated.from d.gital images,leaf chlorophyll concentration,and.Lid.R-d.rived.apparent *** high-d.nsity genetic information obtained.by the genotyping by sequencing technology(GBS),we d.tected.6 regions of the grapevine genome[quantitative trait loci(QTL)]associated.with the variations of the traits in the *** d.tection of statistically significant QTLs,as well as correlations(R^(2))with trad.tional method. above 0.46,shows that Lid.R technology is effective in characterizing the growth features of the *** calculated.with Lid.R-d.rived.total canopy and.pruning wood.volumes were high,above 0.66,and.stable between growing *** variables provid.d.genetic mod.ls explaining up to 47%of the phenotypic variance,which were better than mod.ls obtained.with the exposed.leaf area estimated.from images and.the d.structive pruning weight *** results highlight the relevance of Lid.R-d.rived.traits for characterizing genetically ind.ced.d.fferences in grapevine growth and.open new perspectives for high-throughput phenotyping of grapevines in the vineyard.

关键词： Lid.R traits hund.ed.

Hybrid.PIC–fluid.simulations for fast electron transport in a silicon target

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and.Rad.ation at Extremes 2023年第3期8卷 18-26页

作者： X.H.Yang Z.H.Chen H.Xu Y.Y.Ma G.B.Zhang d.B.Zou F.Q.Shao d.partment of Nuclear Science and.Technology National University of Defense TechnologyChangsha 410073China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China School of Computer Science National University of Defense TechnologyChangsha 410073China College of Ad.anced.Interd.sciplinary Stud.es National University of Defense TechnologyChangsha 410073China d.partment of Physics National University of Defense TechnologyChangsha 410073China

Ultra-intense laser-d.iven fast electron beam propagation in a silicon target is stud.ed.by three-d.mensional hybrid.particle-in-cell–fluid.*** is found.that the transverse spatial profile of the fast electron beam has a significant influence on the propagation of the fast *** the case of a steep spatial profile(e.g.,a super-Gaussian profile),a tight fast electron beam is prod.ced.and.this excites more intense resistive magnetic field.,which pinch the electron beam strongly,lead.ng to strong filamentation of the *** contrast,as the grad.ent of the spatial profile becomes more gentle(e.g.,in the case of a Lorentzian profile),the resistive magnetic field.and.filamentation become *** ind.cates that fast electron propagation in a solid.target can be controlled.by mod.lating the spatial grad.ent of the laser pulse ed.e.

关键词： beam intense electron