Browsing FAS Scholarly Articles by Title

Now showing items 2732-2751 of 18292

    • Concussions and youth football: using a public health law framework to head off a potential public health crisis 

      Baugh, Christine M.; Shapiro, Zachary E. (Oxford University Press, 2015)
      Concussion from sport is increasingly recognized as a public health priority. In response, all states and the District of Columbia have enacted youth concussion legislation. This paper first examines key developments in ...

    • Condensation on slippery asymmetric bumps 

      Park, Kyoo-Chul; Kim, Philseok; Grinthal, Alison Elizabeth; He, Neil; Fox, David; Weaver, James C.; Aizenberg, Joanna (Springer Nature, 2016)
      Controlling dropwise condensation is fundamental to water- harvesting systems1–3, desalination4, thermal power generation4–8, air conditioning9, distillation towers10, and numerous other applications4,5,11. For any of ...

    • Condensed-matter physics: Catching relativistic electrons 

      Zhu, Zhihuai; Hoffman, Jennifer Eve (Nature Publishing Group, 2014)
      Low-energy electrons have been found to mimic relativistic high-energy particles in cadmium arsenide. This defines the first stable '3D Dirac semimetal', which holds promise for fundamental-physics exploration and practical ...

    • Conditional Universal Consistency 

      Fudenberg, Drew; Levine, David (Elsevier, 1999)
      Players choose an action before learning an outcome chosen according to an unknown and history-dependent stochastic rule. Procedures that categorize outcomes, and use a randomized variation on fictitious play within each ...

    • Conductivity of weakly disordered strange metals: From conformal to hyperscaling-violating regimes 

      Lucas, Andrew James; Sachdev, Subir (Elsevier BV, 2015)
      We present a semi-analytic method for constructing holographic black holes that interpolate from anti-de Sitter space to hyperscaling-violating geometries. These are holographic duals of conformal field theories in the ...

    • Confined Organization of Fullerene Units Along High Polymer Chains 

      Fang, Lei; Liu, Peng; Sveinbjornsson, Benjamin R.; Atahan-Evrenk, Sule; Vandewal, Koen; Osuna, Sílvia; Jiménez-Osés, Gonzalo; Shrestha, Supriya; Giri, Gaurav; Wei, Peng; Salleo, Alberto; Aspuru-Guzik, Alan; Grubbs, Robert H.; Houk, K. N.; Bao, Zhenan (Royal Society of Chemistry (RSC), 2013)
      Conductive fullerene \((C_{60})\) units were designed to be arranged in one dimensional close contact by locally organizing them with covalent bonds in a spatially constrained manner. Combined molecular dynamics and quantum ...

    • Confinement transition to density wave order in metallic doped spin liquids 

      Patel, Aavishkar Apoorva; Chowdhury, Debanjan; Allais, Andrea; Sachdev, Subir (American Physical Society (APS), 2016)
      Insulating quantum spin liquids can undergo a confinement transition to a valence bond solid via the condensation of topological excitations of the associated gauge theory. We extend the theory of such transitions to ...

    • Confinement-Enhanced Electron Transport across a Metal-Semiconductor Interface 

      Altfeder, I. B.; Golovchenko, Jene Andrew; Narayanamurti, Venkatesh (American Physical Society (APS), 2001)
      We present a combined scanning tunneling microscopy and ballistic electron emission microscopy study of electron transport across an epitaxial Pb/Si(111) interface. Experiments with a self-assembled Pb nanoscale wedge ...

    • Confinement-induced interlayer molecules: A route to strong interatomic interactions 

      Kanász-Nagy, M.; Demler, E. A.; Zaránd, G. (American Physical Society, 2015)

    • Confinement-Induced Order of Tethered Alkyl Chains at the Water/Vapor Interface 

      Fukuto, M.; Heilmann, R. K.; Pershan, Peter S.; Yu, S. M.; Soto, C. M.; Tirrell, D. A. (American Physical Society, 2002)
      Packing of tethered alkyl chains in Langmuir monolayers of a hairy-rod polypeptide poly[γ-4-(n-hexadecyloxy)benzyl α,L-glutamate] on water has been studied by x-ray scattering measurements at room temperature. The rods lie ...

    • Confirmation of Wide-field Signatures in Redshifted 21 Cm Power Spectra 

      Thyagarajan, Nithyanandan; Jacobs, Daniel C.; Bowman, Judd D.; Barry, N.; Beardsley, A. P.; Bernardi, G.; Briggs, F.; Cappallo, R. J.; Carroll, P.; Deshpande, A. A.; Oliveira-Costa, A. de; Dillon, Joshua S.; Ewall-Wice, A.; Feng, L.; Greenhill, L. J.; Hazelton, B. J.; Hernquist, L.; Hewitt, J. N.; Hurley-Walker, N.; Johnston-Hollitt, M.; Kaplan, D. L.; Kim, Han-Seek; Kittiwisit, P.; Lenc, E.; Line, J.; Loeb, A.; Lonsdale, C. J.; McKinley, B.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Neben, A. R.; Oberoi, D.; Offringa, A. R.; Ord, S. M.; Paul, Sourabh; Pindor, B.; Pober, J. C.; Prabu, T.; Procopio, P.; Riding, J.; Shankar, N. Udaya; Sethi, Shiv K.; Srivani, K. S.; Subrahmanyan, R.; Sullivan, I. S.; Tegmark, M.; Tingay, S. J.; Trott, C. M.; Wayth, R. B.; Webster, R. L.; Williams, A.; Williams, C. L.; Wyithe, J. S. B. (American Astronomical Society, 2015)
      We confirm our recent prediction of the "pitchfork" foreground signature in power spectra of high-redshift 21 cm measurements where the interferometer is sensitive to large-scale structure on all baselines. This is due to ...

    • Confirmation via the Continuum-Fitting Method That the Spin of the Black Hole in Cygnus X-1 Is Extreme 

      Gou, Lijun; McClintock, Jeffrey E.; Remillard, Ronald A.; Steiner, James F.; Reid, Mark J.; Orosz, Jerome A.; Narayan, Ramesh; Hanke, Manfred; García, Javier (IOP Publishing, 2014)
      In Gou et al., we reported that the black hole primary in the X-ray binary Cygnus X-1 is a near-extreme Kerr black hole with a spin parameter a∗ > 0.95 (3σ). We confirm this result while setting a new and more stringent ...

    • Conflict between Genetic and Phenotypic Differentiation: The Evolutionary History of a ‘Lost and Rediscovered’ Shorebird 

      Rheindt, Frank Erwin; Székely, Tamás; Edwards, Scott V.; Lee, Patricia L. M.; Burke, Terry; Kennerley, Peter R.; Bakewell, David N.; Alrashidi, Monif; Kosztolányi, András; Weston, Michael A.; Liu, Wei-Ting; Lei, Wei-Pan; Shigeta, Yoshimitsu; Javed, Sálim; Zefania, Sama; Küpper, Clemens (Public Library of Science (PLoS), 2011)
      Understanding and resolving conflicts between phenotypic and genetic differentiation is central to evolutionary research. While phenotypically monomorphic species may exhibit deep genetic divergences, some morphologically ...

    • Conflict, Defense Spending, and the Number of Nations 

      Alesina, Alberto; Spolaore, Enrico (Elsevier, 2006)
      This paper provides a formal model of endogenous border formation and choice of defense spending in a world with international conflict. We examine both the case of democratic governments and of dictatorships. The model ...

    • Conformal field theories at nonzero temperature: Operator product expansions, Monte Carlo, and holography 

      Katz, Emanuel; Sachdev, Subir; Sørensen, Erik S.; Witczak-Krempa, William (American Physical Society (APS), 2014)
      We compute the nonzero temperature conductivity of conserved flavor currents in conformal field theories (CFTs) in 2+1 space-time dimensions. At frequencies much greater than the temperature, ℏω≫kBT, the ω dependence can ...

    • Conformal field theories in a periodic potential: Results from holography and field theory 

      Chesler, Paul; Lucas, Andrew James; Sachdev, Subir (American Physical Society (APS), 2014)
      We study (2+1)-dimensional conformal field theories (CFTs) with a globally conserved U(1) charge, placed in a chemical potential which is periodically modulated along the spatial direction x with zero average: μ(x)=V cos(kx). ...

    • Conformal vacua and entropy in de Sitter space 

      Bousso, Raphael; Maloney, Alexander; Strominger, Andrew (American Physical Society, 2002)
      The de Sitter/conformal field theory (dS/CFT) correspondence is illuminated through an analysis of massive scalar field theory in d-dimensional de Sitter space. We consider a one-parameter family of dS-invariant vacua ...

    • Conformation and Electronic Population Transfer in Membrane-Supported Self-Assembled Porphyrin Dimers by 2D Fluorescence Spectroscopy 

      Perdomo-Ortiz, Alejandro; Widom, Julia R.; Lott, Geoffrey A.; Aspuru-Guzik, Alan; Marcus, Andrew H. (American Chemical Society (ACS), 2012)
      Two-dimensional fluorescence spectroscopy (2D FS) is applied to determine the conformation and femtosecond electronic population transfer in a dimer of magnesium meso tetraphenylporphyrin. The dimers are prepared by ...

    • Conformation of Self-Assembled Porphyrin Dimers in Liposome Vesicles by Phase-Modulation 2D Fluorescence Spectroscopy 

      Lott, Geoffrey A.; Perdomo-Ortiz, Alejandro; Utterback, James K.; Widom, Julia R.; Aspuru-Guzik, Alán; Marcus, Andrew H. (National Academy of Sciences, 2011)
      By applying a phase-modulation fluorescence approach to 2D electronic spectroscopy, we studied the conformation-dependent exciton coupling of a porphyrin dimer embedded in a phospholipid bilayer membrane. Our measurements ...

    • Conformational Control of Energy Transfer: A Mechanism for Biocompatible Nanocrystal-Based Sensors 

      Kay, Euan R.; Lee, Jungmin; Nocera, Daniel; Bawendi, Moungi G. (Wiley-Blackwell, 2012)
      Fold-up fluorophore: A new paradigm for designing self-referencing fluorescent nanosensors is demonstrated by interfacing a pH-triggered molecular conformational switch with quantum dots. Analytedependent, large-amplitude ...