Now showing items 4781-4800 of 17489

    • Entropy Waves, The Zig-Zag Graph Product, and New Constant-Degree Expanders and Extractors 

      Reingold, Omer; Vadhan, Salil P.; Wigderson, Avi (Princeton University, 2002)
      The main contribution of this work is a new type of graph product, which we call the zig-zag product. Taking a product of a large graph with a small graph, the resulting graph inherits (roughly) its size from the large ...
    • Entropy, Dimension and Combinatorial Moduli for One-Dimensional Dynamical Systems 

      Tiozzo, Giulio (2013-09-30)
      The goal of this thesis is to provide a unified framework in which to analyze the dynamics of two seemingly unrelated families of one-dimensional dynamical systems, namely the family of quadratic polynomials and continued ...
    • Entry and Productivity Growth: Evidence From Microlevel Panel Data 

      Aghion, Philippe; Blundell, Richard; Griffith, Rachel; Howitt, Peter; Prantl, Susanne (MIT Press, 2004)
      How does entry affect productivity growth of incumbents? In this paper we exploit policy reforms in the United Kingdom that changed entry conditions by opening up the U.K. economy during the 1980s and panel data on British ...
    • Entry Liberalization and Inequality in Industrial Performance 

      Aghion, Philippe; Burgess, Robin; Redding, Stephen; Zilibotti, Fabrizio (MIT Press, 2005)
      Industrial delicensing, which began in 1985 in India marked a discrete break from a past of centrally planned industrial development. Similar liberalization episodes are taking place across the globe. We develop a simple ...
    • Enumerating Up-Side Self-Avoiding Walks on Integer Lattices 

      Williams, Lauren (International Press (Cambridge, MA), 1996)
      A self-avoiding walk (saw) is a path on a lattice that does not pass through the same point twice. Though mathematicians have studied saws for over fifty years, the number of n-step saws is unknown. This paper examines a ...
    • Enumeration of Totally Positive Grassmann Cells 

      Williams, Lauren (Elsevier Science B.V. Amsterdam, 2005)
      Postnikov (Webs in totally positive Grassmann cells, in preparation) has given a combinatorially explicit cell decomposition of the totally nonnegative part of a Grassmannian, denoted \(Gr_{kn ^+}\) and showed that this ...
    • Envelope biogenesis and spore formation in Bacillus subtilis 

      Meeske, Alexander Jacob (2016-05-02)
      The bacterial cell wall exoskeleton (or peptidoglycan) protects cells from osmotic lysis, specifies their shape, and its biosynthetic pathway is a widely-exploited antibiotic target. My thesis research focused on defining ...
    • The Envelope of Global Trade: The Political Economy and Intellectual History of Jute in the Bengal Delta, 1850s to 1950s 

      Ali, Tariq Omar (2013-03-05)
      During the second half of the nineteenth century, peasant smallholders in the Bengal delta – an alluvial tract formed out of the silt deposits of the Ganges, Brahmaputra, and Meghna river-systems – expanded their cultivation ...
    • Envelope Structure of Synechococcus sp. WH8113, A Nonflagellated Swimming Cyanobacterium 

      Samuel, Aravinthan DT; Petersen, Jennifer D; Reese, Thomas S (BioMed Central, 2001)
      Background: Many bacteria swim by rotating helical flagellar filaments [1]. Waterbury et al. [15] discovered an exception, strains of the cyanobacterium Synechococcus that swim without flagella or visible changes in shape. ...
    • The Environment and Directed Technical Change 

      Acemoglu, Daron; Aghion, Philippe; Bursztyn, Leonardo; Hemous, David (2009)
      This paper introduces endogenous and directed technical change in a growth model with environmental constraints and limited resources. A unique final good is produced by combining inputs from two sectors. One of these ...
    • Environment-assisted metrology with spin qubits 

      Cappellaro, P.; Goldstein, G.; Hodges, J. S.; Jiang, L.; Maze, J. R.; Sørensen, A. S.; Lukin, Mikhail D. (American Physical Society (APS), 2012)
      We investigate the sensitivity of a recently proposed method for precision measurement [Phys. Rev. Lett. 106, 140502 (2011)], focusing on an implementation based on solid-state spin systems. The scheme amplifies a quantum ...
    • Environment-Assisted Precision Measurement 

      Lukin, Mikhail D.; Goldstein, Garry; Jiang, Liang; Maze, Jero R.; Sørenson, Anders S.; Cappellaro, Paola; Hodges, J. S. (American Physical Society, 2011)
      We describe a method to enhance the sensitivity of precision measurements that takes advantage of the environment of a quantum sensor to amplify the response of the sensor to weak external perturbations. An individual qubit ...
    • Environment-Assisted Quantum Transport 

      Rebentrost, Patrick; Mohseni, Masoud; Kassal, Ivan; Lloyd, Seth; Aspuru-Guzik, Alan (Institute of Physics, 2009)
      Transport phenomena at the nanoscale are of interest due to the presence of both quantum and classical behavior. In this work, we demonstrate that quantum transport efficiency can be enhanced by a dynamical interplay of ...
    • Environment-Assisted Quantum Transport in Ordered Systems 

      Kassal, Ivan; Aspuru-Guzik, Alan (IOP Publishing, 2012)
      Noise-assisted transport in quantum systems occurs when quantum time evolution and decoherence conspire to produce a transport efficiency that is higher than what would be seen in either the purely quantum or purely classical ...
    • Environment-Assisted Quantum Walks in Photosynthetic Energy Transfer 

      Mohseni, Masoud; Rebentrost, Patrick; Lloyd, Seth; Aspuru-Guzik, Alan (American Institute of Physics, 2008)
      Energy transfer within photosynthetic systems can display quantum effects such as delocalized excitonic transport. Recently, direct evidence of long-lived coherence has been experimentally demonstrated for the dynamics of ...
    • Environmental and Biological Controls on the Initiation and Growth of a Middle Triassic (Anisian) Reef Complex on the Great Bank of Guizhou, Guizhou Province, China 

      Payne, Jonathan L.; Lehrmann, Daniel J.; Christensen, Shannon; Wei, Jiayong; Knoll, Andrew (SEPM (Society for Sedimentary Geology), 2006)
      The Great Bank of Guizhou (GBG) is an isolated Late Permian to Late Triassic carbonate platform in the Nanpanjiang Basin of Guizhou Province, southwest China. A faulted syncline exposes a cross section of the platform ...
    • Environmental and Molecular Analysis of the Floral Transition in the Lower Eudicot Aquilegia Formosa 

      Ballerini, Evangeline Sierra; Kramer, Elena M. (BioMed Central, 2011)
      Background Flowering is a critical transition in plant development, the timing of which can have considerable fitness consequences. Until recently, research into the genetic control of flowering time and its associated ...
    • Environmental Fantasies: Mountains, Cities, and Heimat in Weimar Cinema 

      Peabody, Seth (2015-05-13)
      This dissertation analyzes filmic environments within Weimar cinema and argues for a concept of Heimat in which the landscapes of modernity are embedded into the environments of home. Mountain films such as Der heilige ...
    • Environmental Perturbations Lift the Degeneracy of the Genetic Code to Regulate Protein Levels in Bacteria 

      Subramaniam, Arvind R; Pan, Tao; Cluzel, Philippe (National Academy of Sciences, 2013)
      The genetic code underlying protein synthesis is a canonical example of a degenerate biological system. Degeneracies in physical and biological systems can be lifted by external perturbations, thus allowing degenerate ...