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Browsing MIT Open Access Articles by Title

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  • Galbally, David; Fidkowski, Krzysztof; Willcox, Karen E.; Ghattas, O. (John Wiley & Sons, Inc., 2009-09)
    We present a model reduction approach to the solution of large-scale statistical inverse problems in a Bayesian inference setting. A key to the model reduction is an efficient representation of the non-linear terms in the ...
  • Branavan, Satchuthanan R.; Silver, David; Barzilay, Regina (AAAI Press/International Joint Conferences on Artificial Intelligence, 2011-07)
    This paper presents a new Monte-Carlo search algorithm for very large sequential decision-making problems. Our approach builds on the recent success of Monte-Carlo tree search algorithms, which estimate the value of states ...
  • Rithe, Rahulkumar Jagdish; Gu, Jie; Wang, Alice; Datla, Satyendra; Gammie, Gordon; Buss, Dennis; Chandrakasan, Anantha P. (Institute of Electrical and Electronics Engineers (IEEE), 2010-04)
    For CMOS feature size of 65 nm and below, local (or intra-die or within-die) variations in transistor Vt contribute stochastic variation in logic delay that is a large percentage of the nominal delay. Moreover, when circuits ...
  • Sun, Wanxin; Tai, Dean C. S.; Chang, Shi; Xiao, Guangfa; Tan, Nancy; Tang, Huihuan; Yu, Hanry (SPIE - International Society for Optical Engineering, 2008-12)
    Liver fibrosis is associated with an abnormal increase in an extracellular matrix in chronic liver diseases. Quantitative characterization of fibrillar collagen in intact tissue is essential for both fibrosis studies and ...
  • Hsieh, David; McIver, James; Torchinsky, Darius Hosseinzadeh; Gardner, Dillon Richard; Lee, Young S.; Gedik, Nuh (American Physical Society, 2011-02)
    We use ultrafast laser pulses to experimentally demonstrate that the second-order optical response of bulk single crystals of the topological insulator Bi2Se3 is sensitive to its surface electrons. By performing surface ...
  • Loh, William; Ram, Rajeev J.; Juodawlkis, Paul W.; Yegnanarayanan, Sivasubramania (Nature Publishing Group, 2014-01)
    The conversion of electrical signals into modulated optical waves and back into electrical signals provides the capacity for low-loss radio-frequency (RF) signal transfer over optical fiber. Here, we show that the unique ...
  • Mitsos, Alexander; Melas, Ioannis N.; Morris, Melody K.; Saez-Rodriguez, Julio; Lauffenburger, Douglas A.; Alexopoulos, Leonidas G. (Public Library of Science, 2012-11)
    Modeling of signal transduction pathways plays a major role in understanding cells' function and predicting cellular response. Mathematical formalisms based on a logic formalism are relatively simple but can describe how ...
  • Wang, Jinbo; Spall, Michael A.; Flierl, Glenn Richard; Rizzoli, Paola M. (American Meteorological Society, 2013-07)
    Linear and nonlinear radiating instabilities of an eastern boundary current are studied using a barotropic quasigeostrophic model in an idealized meridional channel. The eastern boundary current is meridionally uniform and ...
  • Giannitsis, Constantine; Lindzen, Richard Siegmund (American Meteorological Society, 2009-04)
    The interaction between vertical Rossby wave propagation and wave breaking is studied in the idealized context of a beta-plane channel model. Considering the problem of propagation through a uniform zonal flow in an ...
  • Speck, Jared R. (American Institute of Physics (AIP), 2012-08)
    In this article, we use an electromagnetic gauge-free framework to establish the existence of small-data global solutions to the Maxwell-Born-Infeld (MBI) system on the Minkowski spacetime background in 1+3 dimensions. ...
  • Qiu, Yihui; Perreault, David J.; Keim, Thomas A.; Kassakian, John G. (Institute of Electrical and Electronics Engineers (IEEE), 2011-07)
    A cam-based shear force-actuated electromechanical valve drive system offering variable valve timing in internal combustion engines was previously proposed and demonstrated. To transform this concept into a competitive ...
  • Fan, Kebin; Hwang, Harold Young; Liu, Mengkun; Strikwerda, Andrew C.; Sternbach, Aaron; Zhang, Jingdi; Zhao, Xiaoguang; Zhang, Xin; Nelson, Keith Adam; Averitt, Richard D. (2013-05)
    We demonstrate nonlinear metamaterial split ring resonators (SRRs) on GaAs at terahertz frequencies. For SRRs on doped GaAs films, incident terahertz radiation with peak fields of ∼20–160  kV/cm drives intervalley scattering. ...
  • Yamamoto, N.; Duong, H. M.; Wardle, Brian L.; Marconnet, A. M.; Goodson, K. E. (Institute of Materials, Minerals and Mining, 2011-08)
    Carbon nanotubes (CNTs) have been expected to enhance thermal conductivity in various materials including composites, for applications such as thermal interface materials. However, the thermal properties of bulk CNTs and ...
  • Weinberg, Nevin N.; Arras, Phil; Quataert, Eliot; Burkart, Josh (IOP Publishing, 2012-05)
    We study the excitation and damping of tides in close binary systems, accounting for the leading-order nonlinear corrections to linear tidal theory. These nonlinear corrections include two distinct physical effects: ...
  • Grady, N. K.; Yan, L.; Trugman, D.; Jia, Q.; Chen, H. T.; Taylor, A. J.; Perkins, Bradford G., Jr.; Hwang, Harold Young; Nelson, Keith Adam; Perkins Jr, Bradford G. (EDP Sciences, 2013-03)
    High power THz pulses induce near transparency in superconductive YBCO thin films below the critical temperature. THz pump/THz probe measurements reveal a decay of the induced transparency on the time scale of a few picoseconds.
  • Zhong, Tian; Wong, Franco N. C. (American Physical Society, 2013-08)
    Dispersion and its cancellation in entanglement-based nonlocal quantum measurements are of fundamental and practical interests. We report a demonstration of cancellation of femtosecond-level dispersion by inverting the ...
  • Halperin, B. I.; Shytov, A. V.; Abanin, Dmitry A.; Levitov, Leonid (American Physical Society, 2009-01)
    A nonlocal electric response in the spin Hall regime, resulting from spin diffusion mediating charge conduction, is predicted. The spin-mediated transport stands out due to its long-range character, and can give dominant ...
  • Kamrin, Kenneth N.; Koval, Georg (American Physical Society, 2012-04)
    Extending recent modeling efforts for emulsions, we propose a nonlocal fluidity relation for flowing granular materials, capturing several known finite-size effects observed in steady flow. We express the local Bagnold-type ...
  • Straub, D. N.; Waite, M. L.; Bourouiba, Lydia (Cambridge University Press, 2011-11)
    Turbulent flows subject to solid-body rotation are known to generate steep energy spectra and two-dimensional columnar vortices. The localness of the dominant energy transfers responsible for the accumulation of the energy ...
  • Diamond, P.H.; Sun, H.J.; Cziegler, I.; Podpaly, Y.A.; Rowan, W.L.; Delgado-Aparicio, L.; Ma, Y.; Marmar, E.S.; Rice, John E.; Gao, Chi; Reinke, Matthew Logan; Howard, Nathaniel Thomas; Hubbard, Amanda E.; Terry, James L.; Chilenski, Mark Alan; Ennever, Paul Chappell; Ernst, Darin R.; Greenwald, Martin J.; Hughes, Jerry W.; Marmar, Earl S.; Porkolab, Miklos; White, Anne E.; Wolfe, Stephen M. (IOP Publishing, 2013-02)
    Several seemingly unrelated effects in Alcator C-Mod ohmic L-mode plasmas are shown to be closely connected: non-local heat transport, core toroidal rotation reversals, energy confinement saturation and up/down impurity ...
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