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512篇 您的检索式:作者名="MacDonald F"
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1Controlling light with light using coherent metadevices: all-optical transistor, summator and invertor显示文摘Although vast amounts of information are conveyed by photons in optical fibers,the majority of data processing is performed electronically,creating the infamous‘information bottleneck’and consuming energy at an increasingly unsustainable rate.The potential for photonic devices to directly manipulate light remains unfulfilled due largely to a lack of materials with strong,fast optical nonlinearities.In this paper,we show that small-signal amplifier,summator and invertor functions for optical signals may be realized using a four-port device that exploits the coherent interaction of beams on a planar plasmonic metamaterial,assuming no intrinsic nonlinearity.The redistribution of energy among ports can provide nonlinear input-output signal dependencies and may be coherently controlled at very low intensity levels,with multi-THz bandwidth and without introducing signal distortion,thereby presenting powerful opportunities for novel optical data processing architectures,complexity oracles and the locally coherent networks that are becoming part of the mainstream telecommunications agenda.Xu Fang Kevin F MacDonald Nikolay I Zheludev 2015Light(Science & Applications)2015,4,1:5
2Controlling light-with-light without nonlinearity显示文摘According to the fundamental Huygens superposition principle,light beams traveling in a linear medium will pass though one another without mutual disturbance.Indeed,the field of photonics is based on the premise that controlling light signals with light requires intense laser fields to facilitate beam interactions in nonlinear media,where the superposition principle can be broken.Here we challenge this wisdom and demonstrate that two coherent beams of light of arbitrarily low intensity can interact on a metamaterial layer of nanoscale thickness in such a way that one beam modulates the intensity of the other.We show that the interference of beams can eliminate the plasmonic Joule losses of light energy in the metamaterial or,in contrast,can lead to almost total absorption of light.Applications of this phenomenon may lie in ultrafast all-optical pulse-recovery devices,coherence filters and terahertz-bandwidth light-by-light modulators.Jianfa Zhang Kevin F MacDonald Nikolay I Zheludev 2012Light(Science & Applications)2012,1,1:5
3健康领域的文化能力显示文摘1背景 尽管人类对其他社会的兴趣纵贯历史的各个阶段,但是检验不同文化概念对人类健康实践的影响从20世纪才开始,当时是伴随着长期的人类学田野调查产生的,这些田野调查揭露了不同文化之间相关卫生实践的多样性、复杂性和连续性。Napier A D Ancarno C Butler B Calabrese j Chater A Chatterjee H Guesnet F Home R Jacyna S Jadhav S Macdonald A Neuendorf U Parkhurst A Reynolds R Scambler G Shamdasani S Smith S Z Stougaard-Nielsen J Thomson L Tyler N Volkmann A M Walker T Watson J Williams AC Willott C Wilson J Woolf K 2016中国卫生政策研究2016,9,2:5
4文化、不平等性与卫生服务提供显示文摘1动态不平等性对基层医疗卫生人力的影响 政治、社会、文化、专业群体皆建立在一致且常规的人类行为之上。当遭受巨大变革和内外压力时,这些群体会变得十分脆弱。尤其在动荡时期,这些群体往往更关注社会和文化的差异性,而非二者的一致性。尽管社会中的个体思维和行为会呈现较大的差异,但对健康的感知具有统一性,并在更广范围人群内尤为突出,这主要归因于文化价值观的作用。广义的文化心态会随着时间和地理位置的不同而不同,就像健康的社会决定因素也会因文化类型的不同而产生差异。Napier A D Ancarno C Butler B Calabrese J Chater A Chatterjee H Guesnet F Horne R Jacyna S Jadhav S Macdonald A Neuendorf U Parkhurst A Reynolds R Scambler G Shamdasani S Smith S Z Stougaard-Nielsen J Thomson L Tyler N Volkmann A M Walker T Watson J Williams A C Willott C Wilson J Woolf K 2016中国卫生政策研究2016,9,3:2
5Nonlinear dielectric optomechanical metamaterials显示文摘We introduce a dielectric photonic metamaterial presenting a giant nonlinear optical response driven by resonant optomechanical forces.Being inherently free of Joule losses,it exhibits optical bistability at intensity levels of less than 0.2 mW mm22 and,furthermore,manifests nonlinear asymmetric transmission with a forward:backward optical extinction ratio of more than 30 dB.Jianfa Zhang Kevin F MacDonald Nikolay I Zheludev 2013Light(Science & Applications)2013,2,1:2
6Development and evaluation of sediment quality guidelines for Florida coastal waters显示文摘MACDONALD D D CARR R S CALDER F D 1996Ecotoxicology1996,5,:1
7Strategic management of technical functions 显示文摘Adler P S McDonald D W MacDonald F 1992Sloan Management Review1992,33,2:1
8Aeromonas veronii a new ornithine decarboxylase-positive species that may cause diarrhea显示文摘Hickman-Brenner F W MacDonald K L Steigerwalt A G 1987Clin Mierobiol1987,25,5:1
9医疗卫生保健文化的反思及促进健康与文化融合的建议显示文摘1医疗卫生保健文化的反思1.1健康文化与医学知识如果医务人员有充足的时间对患者进行诊断并帮助患者进行社区护理,就可在节省卫生费用的同时改善健康结果。整合型社区护理能缩小不同文化背景和群体健康需求的差异。然而,全球范围内对整合型社区护理的投入较少,原因之一就是20世纪对临床服务的重视弱化了卫生服务提供过程中的同情心理。当然,患者也对医学知识存在显性和隐性的影响(特别是当其因不遵医嘱而受到指责时)。Napier A D Ancarno C Butler B Calabrese J Chater A Chatterjee H Guesnet F Horne R Jacyna S Jadhav S Macdonald A Neuendorf U Parkhurst A Reynolds R Scambler G Shamdasani S Smith S Z Stougaard-Nielsen J Thomson L Tyler N Volkmann A M Walker T Watson J Williams A C Willott C Wilson JWoolf K 2016中国卫生政策研究2016,9,4:1
10Trifluoroacetate profiles in the Arctic,Atlantic,and Pacific Oceans显示文摘B F Scott R W Macdonald 0,,:1
11Stress analysis of drillstring threaded connections using the finite element method显示文摘MACDONALD K A DEANS W F 1995Engineering Failure Analysis1995,2,1:1
12Development and evaluation of sediment quality guidelines for Florida coastal waters显示文摘MacDonald D D Carr R S Calder F D 1996Ecotoxicology1996,5,:1
13Development and evaluation of sediment quality guidelines for Florida coastal waters显示文摘MacDonald D D Carr R S Calder F D 1996Ecotoxicology1996,5,4:1
14Notch signaling in T- and B-cell development 显示文摘Radtke F Wilson A MacDonald HR 2004Curr Opin Immunmol2004,16,2:1
15Solar sail parking in restricted three-body system显示文摘Mclnnes C R Mcdonald A J C Simmons J F L MacDonald E W 1994Journal of Guidance Control and Dynamics1994,17,2:1
16An analysis of smoldering fires in closed compartments and their hazard due to carbon monoxide 显示文摘Quintiere J G Birky M Macdonald F 1982Fire Material1982,6,34:1
17Interleukin-21 : a critical regulator of the balance between effector and regulatory T-cell re- sponses 显示文摘Monteleone G Pallone F Macdonald TY 2008Trends Immunol2008,29,6:1
18Threedimensional reconstruction of porous media from serial section data显示文摘Kwiecien M J Macdonald I F Dullien F A L 1990Journal of Microscopy1990,159,:1
19Regulation of innate and adaptive immunity by Notch显示文摘RADTKE F MACDONALD H R TACCHINI-COTTIER F 2013Nat Rev Immunol2013,13,6:1
20Finite element simulation of the hip joint during stumbling:A comparison between static and dynamic loading显示文摘El′Sheikh H F MacDonald B J Hashmi M S J 2003Mater proc Techn2003,,1:1
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