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10篇 您的检索式:作者名="Chris Powell"
    题名 作者 年代 出处 被引量
1新疆叶城晚新生代山前盆地演化与青藏高原北缘的隆升——Ⅱ沉积相与沉积盆地演化显示文摘叶城盆地属于塔里木盆地的西南坳陷 ,在晚新生代沉积了巨厚的磨拉石建造。盆地的演化具有阶段性 ,反映了西昆仑山不断的隆升。中新世 ,盆地的沉积环境为曲流河和辨状河等河湖相环境 ,到上新世早期变为冲积扇的远端。晚上新世 (~ 3.6 Ma)开始 ,盆地的沉积环境发生了质的变化 ,沉积物以粗颗粒砾岩为主 ,沉积环境为干旱气候条件下的冲 -洪积扇近端。沉积相的变化 ,反映了昆仑山在晚上新世有强烈的隆升。郑洪波 Kutherine Butcher Chris Powell 2003沉积学报2003,21,1:23
2Measurement and control of business processes显示文摘Stephen G Powell Markus Schwaninger Chris Trimble 2001System Dynamics Review2001,17,1:1
3web content management systems in higher education显示文摘Wayne Powell Chris Gill 2003Educause quarterly2003,,2:1
4A qualitative study of English community pharmacists’ experiences of providing lifestyle advice to patients with cardiovascular disease显示文摘Kirsty Morton Helen Pattison Chris Langley Rachael Powell 2014Research in Social and Administrative Pharmacy2014,,:1
5Late Neogene aeohan loess deposition in southern Tarim Basin and its palaeoenvironmental significance显示文摘Zheng Hongbo Kutherine Butcher Chris Powell 2003Tectonophysics2003,375,:1
6The impact of brewing yeast cell age on fermentation performance, attenuation and flocculation显示文摘Chris D Powell David E Quain Katherine A Smart 2003FEMS Yeast Research2003,,2:1
7Late Neogene loess deposition in southern Tarim Basin, tectonic and palaeoenvironmental imphcations 显示文摘Hongbo Zheng Chris McA Powell Katherine Butcher 2003Tectonophysics2003,375,1:1
8Nonlinear association between soil lead and blood lead of children in metropolitan New Orleans, Louisiana: 2000–2005显示文摘Howard W. Mielke Chris R. Gonzales Eric Powell Morten Jartun Paul W. Mielke 2007Science of the Total Environment2007,,1:1
9Maintenance of Species Differences in Closely Related Tetraploid Parasitic Euphrasia (Orobanchaceae) on an Isolated Island显示文摘Polyploidy is pervasive in angiosperm evolution and plays important roles in adaptation and speciation.However,polyploid groups are understudied due to complex sequence homology,challenging genome assembly,and taxonomic complexity.Here,we study adaptive divergence in taxonomically complex eyebrights(Euphrasia),where recent divergence,phenotypic plasticity,and hybridization blur species boundaries.We focus on three closely related tetraploid species with contrasting ecological preferences that are sympatric on Fair Isle,a small isolated island in the British Isles.Using a common garden experiment,we show a genetic component to the morphological differences present between these species.Using wholegenome sequencing and a novel k-mer approach we call“Tetmer”,we demonstrate that the species are of allopolyploid origin,with a sub-genome divergence of approximately 5%.Using2 million SNPs,we show sub-genome homology across species,with a very low sequence divergence characteristic of recent speciation.This genetic variation is broadly structured by species,with clear divergence of Fair Isle heathland Euphrasia micrantha,while grassland Euphrasia arctica and coastal Euphrasia foulaensis are more closely related.Overall,we show that tetraploid Euphrasia is a system of allopolyploids of postglacial species divergence,where adaptation to novel environments may be conferred by old variants rearranged into new genetic lineages.Hannes Becher Max R.Brown Gavin Powell Chris Metherell Nick J.Riddifordand Alex D.Twyford 2020Plant Communications2020,1,6:0
10Influence of laser polarization on collective electron dynamics in ultraintense laser-foil interactions显示文摘The collective response of electrons in an ultrathin foil target irradiated by an ultraintense(~6×10^(20)W cm^(-2)) laser pulse is investigated experimentally and via 3D particle-in-cell simulations. It is shown that if the target is sufficiently thin that the laser induces significant radiation pressure, but not thin enough to become relativistically transparent to the laser light, the resulting relativistic electron beam is elliptical, with the major axis of the ellipse directed along the laser polarization axis. When the target thickness is decreased such that it becomes relativistically transparent early in the interaction with the laser pulse, diffraction of the transmitted laser light occurs through a so called ‘relativistic plasma aperture', inducing structure in the spatial-intensity profile of the beam of energetic electrons. It is shown that the electron beam profile can be modified by variation of the target thickness and degree of ellipticity in the laser polarization.Bruno Gonzalez-Izquierdo Ross J.Gray Martin King Robbie Wilson Rachel J.Dance Haydn Powell David A.Mac Lellan John McCreadie Nicholas M.H.Butler Steve Hawkes James S.Green Chris D.Murphy Luca C.Stockhausen David C.Carroll Nicola Booth Graeme G.Scott Marco Borghesi David Neely Paul McKenna 2016High Power Laser Science and Engineering2016,4,3:0
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