Now showing items 34182-34201 of 34822

    • W-state Analyzer and Multi-party Measurement-device-independent Quantum Key Distribution 

      Zhu, Changhua; Xu, Feihu; Pei, Changxing (Nature Publishing Group, 2015-12)
      W-state is an important resource for many quantum information processing tasks. In this paper, we for the first time propose a multi-party measurement-device-independent quantum key distribution (MDI-QKD) protocol based ...
    • WaaZam!: supporting creative play at a distance in customized video environments 

      Hunter, Seth Edward; Maes, Patricia; Tang, Anthony; Inkpen, Kori M.; Hessey, Susan M. (Association for Computing Machinery, 2014-05)
      We present the design, and evaluation of WaaZam, a video mediated communication system designed to support creative play in customized environments. Users can interact together in virtual environments composed of digital ...
    • Wafer integrated micro-scale concentrating photovoltaics 

      Jared, Bradley; Keeler, Gordon; Miller, Bill; Sweatt, William; Paap, Scott; e.a. (American Institute of Physics (AIP), 2017-09)
      Recent development of a novel micro-scale PV/CPV technology is presented. The Wafer Integrated Micro-scale PV approach (WPV) seamlessly integrates multijunction micro-cells with a multi-functional silicon platform that ...
    • Wafer-scale 3D integration of InGaAs image sensors with Si readout circuits 

      Shaver, David C.; Keast, Craig L.; Wheeler, Bruce D.; Hu, WeiLin; Bolkhovsky, Vladimir; e.a. (Institute of Electrical and Electronics Engineers, 2009-10)
      In this work, we modified our wafer-scale 3D integration technique, originally developed for Si, to hybridize InP-based image sensor arrays with Si readout circuits. InGaAs image arrays based on the InGaAs layer grown on ...
    • Wafer-scale 3D integration of silicon-on-insulator RF amplifiers 

      Keast, Craig L.; Chen, Chang-Lee; Chen, Chenson K.; Yost, Donna-Ruth W.; Knecht, Jeffrey M.; e.a. (Institute of Electrical and Electronics Engineers, 2009-02)
      RF amplifiers are demonstrated using a three- dimensional (3D) wafer-scale integration technology based on silicon-on-insulator (SOI) CMOS process. This new 3D implementation reduces the amplifier size and shortens ...
    • Wait-learning: Leveraging conversational dead time for second language education 

      Guo, Philip J.; Miller, Robert C.; Cai, Carrie Jun; Glass, James R. (Association for Computing Machinery (ACM), 2014-04)
      Second-language learners are often unable to find time for language practice due to constraints in their daily lives. In this paper, we examine how brief moments of waiting during a person's existing social conversations ...
    • Wait-Learning: Leveraging Wait Time for Second Language Education 

      Cai, Carrie Jun; Guo, Philip J; Glass, James R; Miller, Robert C (Association for Computing Machinery, 2015-04)
      Competing priorities in daily life make it difficult for those with a casual interest in learning to set aside time for regular practice. In this paper, we explore wait-learning: leveraging brief moments of waiting during ...
    • Waiting to Vote 

      Ansolabehere, Stephen; Stewart III, Charles H (Mary Ann Lieber, 2015-03)
      We review evidence that long lines waiting to vote in the 2012 presidential election were costly and disproportionately appeared in certain regions of the country, in cities, and among minority voters. We argue that the ...
    • WaitSuite: Productive Use of Diverse Waiting Moments 

      Cai, Carrie Jun; Miller, Robert C; Ren, Anji (Association for Computing Machinery (ACM), 2017-03)
      The busyness of daily life makes it difficult to find time for informal learning. Yet, learning requires significant time and effort, with repeated exposures to educational content on a recurring basis. Despite the struggle ...
    • Wake Capture, Particle Breakup, and Other Artifacts Associated with Counterflow Virtual Impaction 

      Pekour, Mikhail S.; Cziczo, Daniel James (Taylor & Francis, 2011-03)
      Counterflow virtual impaction is used to inertially separate cloud elements from inactivated aerosol. Previous airborne, ground-based, and laboratory studies using this technique exhibit artifacts that are not fully explained ...
    • Wake of a heavy quark in non-Abelian plasmas: Comparing kinetic theory and the anti-de Sitter space/conformal field theory correspondence 

      Hong, Juhee; Teaney, Derek; Chesler, Paul Michael (American Physical Society, 2012-06)
      We compute the nonequilibrium stress tensor induced by a heavy quark moving through weakly coupled QCD plasma at the speed of light and compare the result to N=4 super-Yang-Mills theory at strong coupling. The QCD Boltzmann ...
    • Wake structure and sediment deposition behind models of submerged vegetation with and without flexible leaves 

      Hu, Zhenghong; Lei, Jiarui; Liu, Chao; Nepf, Heidi (Elsevier BV, 2018-08)
      This laboratory study explored the flow structure and pattern of deposition directly downstream of submerged patches of vegetation, focusing on whether, or not, the presence of flexible trailing leaves enhanced deposition. ...
    • The wake structure behind a porous obstruction and its implications for deposition near a finite patch of emergent vegetation 

      Chen, Zhengbing; Ortiz, Alejandra Campbell; Zong, Lijun; Nepf, Heidi (American Geophysical Union (Wiley platform), 2012-09)
      This experimental study describes the mean and turbulent flow structure in the wake of a circular array of cylinders, which is a model for a patch of emergent vegetation. The patch diameter, D, and patch density, a (frontal ...
    • Wake-body Resonance of Long Flexible Structures is Dominated by Counterclockwise Orbits 

      Modarres-Sadeghi, Yahya; Karniadakis, George E.; Bourguet, Remi; Triantafyllou, Michael S. (American Physical Society (APS), 2011-09)
      We identify a dominant mechanism in the interaction between a slender flexible structure undergoing free vibrations in sheared cross-flow and the vortices forming in its wake: energy is transferred from the fluid to the ...
    • Waking up dormant tumors 

      Tse, Joyce C.; Kalluri, Raghu (BioMed Central Ltd., 2011-06)
      As appreciation grows for the contribution of the tumor microenvironment to the progression of cancer, new evidence accumulates to support that the participation of stromal cells can extend beyond the local environment. ...
    • Walk the line: station context, corridor type and bus rapid transit walk access in Jinan, China 

      Jiang, Yang; Mehndiratta, Shomik; Zegras, P. Christopher (Elsevier, 2011-11)
      This paper examines BRT station walk access patterns in rapidly urbanizing China and the relationship between bus rapid transit (BRT) station context and corridor type and the distance people will walk to access the system ...
    • Walking droplets in a circular corral: Quantisation and chaos 

      Cristea-Platon, Tudor; Saenz Hervias, Pedro Javier; Bush, John W. M. (AIP Publishing, 2018-09)
      A millimetric liquid droplet may walk across the surface of a vibrating liquid bath through a resonant interaction with its self-generated wavefield. Such walking droplets, or "walkers," have attracted considerable recent ...
    • Walking Is Not Like Reaching: Evidence from Periodic Mechanical Perturbations 

      Ahn, Jooeun; Hogan, Neville (Public Library of Science, 2012-03)
      The control architecture underlying human reaching has been established, at least in broad outline. However, despite extensive research, the control architecture underlying human locomotion remains unclear. Some studies ...
    • Walking on water 

      Bush, John W. M.; Hu, David L. (American Institute of Physics, 2010-06)
      The ingenious methods employed by insects and spiders to move across a water surface rely on microphysics that is of little use to larger water walkers but of considerable interest to the microfluidics community.
    • Waltzing around cofactors 

      Chen, Percival Yang-Ting; Drennan, Catherine L.; Wittenborn, Elizabeth Charlot (eLife Sciences Publications, Ltd., 2016-02)
      The metallocofactor involved in fixing nitrogen is not a rigid scaffold, as was previously thought.