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42篇 您的检索式:作者名="David Willis"
    题名 作者 年代 出处 被引量
1Ultrathin tunable terahertz absorber based on MEMS-driven metamaterial显示文摘The realization of high-performance tunable absorbers for terahertz frequencies is crucial for advancing applications such as single-pixel imaging and spectroscopy.Based on the strong position sensitivity of metamaterials’electromagnetic response,we combine meta-atoms that support strongly localized modes with suspended flat membranes that can be driven electrostatically.This design maximizes the tunability range for small mechanical displacements of the membranes.We employ a micro-electromechanical system technology and successfully fabricate the devices.Our prototype devices are among the best-performing tunable THz absorbers demonstrated to date,with an ultrathin device thickness(~1/50 of the working wavelength),absorption varying between 60%and 80%in the initial state when the membranes remain suspended,and fast switching speed(~27μs).The absorption is tuned by an applied voltage,with the most marked results achieved when the structure reaches the snap-down state.In this case,the resonance shifts by >200% of the linewidth(14% of the initial resonance frequency),and the absolute absorption modulation measured at the initial resonance can reach 65%.The demonstrated approach can be further optimized and extended to benefit numerous applications in THz technology.Mingkai Liu Mohamad Susli Dilusha Silva Gino Putrino Hemendra Kala Shuting Fan Michael Cole Lorenzo Faraone Vincent P.Wallace Willie J.Padilla David A.Powell Ilya V.Shadrivov Mariusz Martyniuk 2017Microsystems & Nanoengineering2017,3,1:2
2The Evolving Role of Laparoscopy in Colonic Diverticular Disease: A Systematic Review显示文摘Wolfgang B. Gaertner Mary R. Kwaan Robert D. Madoff David Willis George E. Belzer David A. Rothenberger Genevieve B. Melton 2013World Journal of Surgery2013,,3:2
3Differential Targeting of Prosurvival Bcl-2 Proteins by Their BH3-Only Ligands Allows Complementary Apoptotic Function显示文摘Lin Chen Simon N. Willis Andrew Wei Brian J. Smith Jamie I. Fletcher Mark G. Hinds Peter M. Colman Catherine L. Day Jerry M. Adams David C.S. Huang 2005Molecular Cell2005,,3:2
4Geodynamics of oceanic plateau and plume head accretion and their role in Phanerozoic orogenic systems of China显示文摘We present three 3D numerical models of deep subduction where buoyant material from an oceanic plateau and a plume interact with the overriding plate to assess the influence on subduction dynamics,trench geometry,and mechanisms for plateau accretion and continental growth.Transient instabilities of the convergent margin are produced,resulting in:contorted trench geometry;trench migration parallel with the plate margin;folding of the subducting slab and orocline development at the convergent margin;and transfer of the plateau to the overriding plate.The presence of plume material beneath the oceanic plateau causes flat subduction above the plume,resulting in a 'bowed' shaped subducting slab.In plateau-only models,plateau accretion at the edge of the overriding plate results in trench migration around the edge of the plateau before subduction is re-established directly behind the trailing edge of the plateau.The plateau shortens and some plateau material subducts.The presence of buoyant plume material beneath the oceanic plateau has a profound influence on the behaviour of the convergent margin.In the plateau + plume model,plateau accretion causes rapid trench advance.Plate convergence is accommodated by shearing at the base of the plateau and shortening in the overriding plate.The trench migrates around the edge of the plateau and subduction is re-established well behind the trailing edge of the plateau,effectively embedding the plateau into the overriding plate.A slab window forms beneath the accreted plateau and plume material is transferred from the subducting plate to the overriding plate through the window.In all of the models,the subduction zone maintains a relatively stable configuration away from the buoyancy anomalies within the downgoing plate.The models provide a dynamic context for plateau and plume accretion in Phanerozoic accretionary orogenic systems such as the East China Orogen and the Central Asian Orogen(Altiads),which are characterised by accreted ophiolite complexes with diverse geochemical affinities,and a protracted evolution of accretion of exotic terranes including oceanic plateau and terranes with plume origins.Peter G.Betts Louis Moresi Meghan S.Miller David Willis 2015Geoscience Frontiers2015,6,1:2
5EMTP - a powerful tool for analyzing power system transient 显示文摘Willis Long David Cotecher Dan Ruiue 1990IEEE Computer application in power1990,3,1:1
6Palliation of patients with malignant gastric outlet obstruction with the enteral Wallstent: outcomes from a multicenter study显示文摘Jennifer J. Telford David L. Carr-Locke Todd H. Baron Andrea Tringali Willis G. Parsons Armando Gabbrielli Guido Costamagna 2004Gastrointestinal Endoscopy2004,,6:1
7Mechanisms of disease:natriuretic peptides显示文摘Ellia R David G Willis K 1998N Eng J Med1998,339,5:1
83D Conformal radiotherapy for gastric cancer—results of a comparative planning study显示文摘Trevor Leong David Willis Daryl Lim Joon Sara Condron Andrew Hui Samuel Y.K. Ngan 2005Radiotherapy and Oncology2005,,3:1
9Challenges in the Detection and Attribution of Northern Hemisphere Surface Temperature Trends Since 1850显示文摘Since 2007,the Intergovernmental Panel on Climate Change(IPCC)has heavily relied on the comparison between global climate model hindcasts and global surface temperature(ST)estimates for concluding that post-1950s global warming is mostly human-caused.In Connolly et al.,we cautioned that this approach to the detection and attribution of climate change was highly dependent on the choice of Total Solar Irradiance(TSI)and ST data sets.We compiled 16 TSI and five ST data sets and found by altering the choice of TSI or ST,one could(prematurely)conclude anything from the warming being“mostly human-caused”to“mostly natural.”Richardson and Benestad suggested our analysis was“erroneous”and“flawed”because we did not use a multilinear regression.They argued that applying a multilinear regression to one of the five ST series re-affirmed the IPCC's attribution statement.They also objected that many of the published TSI data sets were out-of-date.However,here we show that when applying multilinear regression analysis to an expanded and updated data set of 27 TSI series,the original conclusions of Connolly et al.are confirmed for all five ST data sets.Therefore,it is still unclear whether the observed warming is mostly human-caused,mostly natural or some combination of both.Ronan Connolly Willie Soon Michael Connolly Sallie Baliunas Johan Berglund C.J.Butler Rodolfo Gustavo Cionco Ana G.Elias Valery M.Fedorov Hermann Harde Gregory W.Henry Douglas V.Hoyt Ole Humlum David R.Legates Nicola Scafetta Jan-Erik Solheim LászlóSzarka Víctor M.Velasco Herrera Hong Yan Weijia Zhang 2023Research in Astronomy and Astrophysics2023,23,10:1
10Management reports on internal controls 显示文摘David Willis Susan Lightle 2000Journal of Accountancy2000,190,4:1
11Mechanisms of Disease:NatriureticPeptides显示文摘Ellis R David G Willis K 1998N Engl J Med1998,339,5:1
12Netflix显示文摘Willy Shih Stephen Kaufman David Spinola 0,,04:1
13How much has the Sun influenced Northern Hemisphere temperature trends?An ongoing debate显示文摘In order to evaluate how much Total Solar Irradiance(TSI)has influenced Northern Hemisphere surface air temperature trends,it is important to have reliable estimates of both quantities.Sixteen different estimates of the changes in TSI since at least the 19th century were compiled from the literature.Half of these estimates are'low variability'and half are'high variability'.Meanwhile,five largely-independent methods for estimating Northern Hemisphere temperature trends were evaluated using:1)only rural weather stations;2)all available stations whether urban or rural(the standard approach);3)only sea surface temperatures;4)tree-ring widths as temperature proxies;5)glacier length records as temperature proxies.The standard estimates which use urban as well as rural stations were somewhat anomalous as they implied a much greater warming in recent decades than the other estimates,suggesting that urbanization bias might still be a problem in current global temperature datasets-despite the conclusions of some earlier studies.Nonetheless,all five estimates confirm that it is currently warmer than the late 19th century,i.e.,there has been some'global warming'since the 19th century.For each of the five estimates of Northern Hemisphere temperatures,the contribution from direct solar forcing for all sixteen estimates of TSI was evaluated using simple linear least-squares fitting.The role of human activity on recent warming was then calculated by fitting the residuals to the UN IPCC’s recommended'anthropogenic forcings'time series.For all five Northern Hemisphere temperature series,different TSI estimates suggest everything from no role for the Sun in recent decades(implying that recent global warming is mostly human-caused)to most of the recent global warming being due to changes in solar activity(that is,that recent global warming is mostly natural).It appears that previous studies(including the most recent IPCC reports)which had prematurely concluded the former,had done so because they failed to adequately consider all the relevant estimates of TSI and/or to satisfactorily address the uncertainties still associated with Northern Hemisphere temperature trend estimates.Therefore,several recommendations on how the scientific community can more satisfactorily resolve these issues are provided.Ronan Connolly Willie Soon Michael Connolly Sallie Baliunas Johan Berglund C.John Butler Rodolfo Gustavo Cionco Ana G.Elias Valery M.Fedorov Hermann Harde Gregory W.Henry Douglas V.Hoyt Ole Humlum David R.Legates Sebastian Liming Nicola Scafetta Jan-Erik Solheim Laszlo Szarka Harry van Loon Victor M.Velasco Herrera Richard C.Willson 晏宏 Weijia Zhang 2021Research in Astronomy and Astrophysics2021,21,6:1
14Study of water-soluble atmospheric humic matter in urban and marine environments显示文摘Zoltán Krivácsy Gyula Kiss Darius Ceburnis Gerard Jennings Willy Maenhaut Imre Salma David Shooter 2007Atmospheric Research2007,,1:1
15A novel biomimetic analysis system for quantitative characterisation of sclerosing foams used for the treatment of varicose veins显示文摘Dario Carugo Dyan N. Ankrett Vincent O’Byrne Sean Willis David D. I. Wright Andrew L. Lewis Martyn Hill Xunli Zhang 2013Journal of Materials Science: Materials in Medicine2013,,6:1
16Distributed process groups in the v kernel显示文摘 Willy Zwaenepoel 1985ACM Transactions on Computer Systems1985,3,2:1
17Adjuvant Chemoradiation for Gastric Cancer Using Epirubicin, Cisplatin, and 5-Fluorouracil Before and After Three-Dimensional Conformal Radiotherapy With Concurrent Infusional 5-Fluorouracil: A Multicenter Study of the Trans-Tasman Radiation Oncology Grou显示文摘Trevor Leong Daryl Lim Joon David Willis Jayasingham Jayamoham Nigel Spry Jennifer Harvey Juliana Di Iulio Alvin Milner G. Bruce Mann Michael Michael 2011International Journal of Radiation Oncology Biology Physics2011,,3:1
18Mechanisms of disease: natriuretic peptide 显示文摘Levin Ellis R David G Samson Willis K 1998New England journal of medicine1998,339,5:1
19Mechanisms of disease: natriuretic peptides显示文摘Ellis R David G Willis K 1998N Engl J Med1998,339,5:1
20Japanese and American Principals: a comparison of excellence in educational leadership显示文摘David B. Willis Carol A. Bartell 1990Comparative Education1990,,1:1
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