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Browsing MIT Open Access Articles by Title

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  • Beane, S. R.; Chang, E.; Cohen, S. D.; Junnarkar, P.; Lin, H. W.; Luu, T. C.; Orginos, K.; Parreño, A.; Savage, M. J.; Walker-Loud, A.; Detmold, William (American Physical Society, 2013-08)
    The scattering lengths and effective ranges that describe low-energy nucleon-nucleon scattering are calculated in the limit of SU(3)-flavor symmetry at the physical strange-quark mass with lattice quantum chromodynamics. ...
  • Green, Jeremy Russell; Negele, John W.; Pochinsky, Andrew (American Physical Society, 2012-12)
    We present 2+1 flavor lattice QCD calculations of the nucleon scalar and tensor charges. Using the BMW clover-improved Wilson action with pion masses between 149 and 356 MeV and three source-sink separations between 0.9 ...
  • Bratt, Jonathan D.; Edwards, R. G.; Englehardt, M.; Hagler, Ph.; Lin, H. W.; Lin, M. F.; Meyer, Harvey B.; Musch, B.; Negele, John W.; Orginos, K.; Pochinsky, Andrew; Procura, Massimiliano; Richards, D. G.; Schroers, W.; Syritsyn, Sergey Nikolaevich (American Physical Society, 2010-11)
    We present high statistics results for the structure of the nucleon from a mixed-action calculation using 2+1 flavors of asqtad sea and domain-wall valence fermions. We perform extrapolations of our data based on different ...
  • Alexandrou, C.; Koutsou, G.; Negele, John W.; Proestos, Y.; Tsapalis, A. (American Physical Society, 2011-01)
    We calculate the electromagnetic, axial, and pseudoscalar form factors of the nucleon to Δ(1232) transition using two dynamical light degenerate quarks and a dynamical strange quark simulated with the domain wall fermion ...
  • Stinson, Benjamin Michael; Nager, Andrew Ross; Glynn, Steven E.; Schmitz, Karl R.; Baker, Tania; Sauer, Robert T. (Elsevier B.V., 2013-04)
    ClpX, a AAA+ ring homohexamer, uses the energy of ATP binding and hydrolysis to power conformational changes that unfold and translocate target proteins into the ClpP peptidase for degradation. In multiple crystal structures, ...
  • Urzi, Dina; Gehrke, Lee (American Society for Microbiology, 2009-02)
    Cytoplasmic viral RNAs with 5′ triphosphates (5′ppp) are detected by the RNA helicase RIG-I, initiating downstream signaling and alpha/beta interferon (IFN-α/β) expression that establish an antiviral state. We demonstrate ...
  • Jean, A.; Laurent, L.; Bockaert, J.; Charnay, Y.; Dusticier, N.; Nieoullon, A.; Barrot, M.; Neve, Rachael L.; Compan, V. (Nature Publishing Group, 2012-12)
    In mental diseases, the brain does not systematically adjust motor activity to feeding. Probably, the most outlined example is the association between hyperactivity and anorexia in Anorexia nervosa. The neural underpinnings ...
  • Chen, Naiyan; Sugihara, Hiroki; Sharma, Jitendra; Perea Parrilla, Gertrudis; Petravicz, Jeremy C.; Le, Chuong N.; Sur, Mriganka (National Academy of Sciences (U.S.), 2012-09)
    Although cholinergic innervation of the cortex by the nucleus basalis (NB) is known to modulate cortical neuronal responses and instruct cortical plasticity, little is known about the underlying cellular mechanisms. Using ...
  • Duflo, Esther; Kremer, Michael; Robinson, Jonathan (American Economic Association, 2010-10)
    We model farmers as facing small fixed costs of purchasing fertilizer and assume some are stochastically present biased and not fully sophisticated about this bias. Such farmers may procrastinate, postponing fertilizer ...
  • Platt, Robert; Fagg, Andrew H.; Grupen, Roderic A. (Institute of Electrical and Electronics Engineers, 2010-04)
    A key problem in robot grasping is that of positioning the manipulator contacts so that an object can be grasped. In unstructured environments, contact positions are typically planned based on range or visual measurements ...
  • Fox, Jacob; Suk, Andrew; Pach, Janos (Society for Industrial and Applied Mathematics, 2013-03)
    A graph drawn in the plane is called k-quasi-planar if it does not contain k pairwise crossing edges. It has been conjectured for a long time that for every fixed k, the maximum number of edges of a k-quasi-planar graph ...
  • Bardhan, Jaydeep P.; Altman, Michael D.; Willis, David J.; Lippow, Shaun M.; Tidor, Bruce; White, Jacob K. (American Institute of Physics (AIP), 2007-07)
    urface formulations of biophysical modeling problems offer attractive theoretical and computational properties. Numerical simulations based on these formulations usually begin with discretization of the surface under ...
  • Wang, Xiaoting; Byrd, Mark; Jacobs, Kurt (American Physical Society, 2013-01)
    In this work, inspired by the study of semidefinite programming for block-diagonalizing matrix *-algebras, we propose an algorithm that can find the algebraic structure of decoherence-free subspaces (DFS's) for a given ...
  • Csete, Maria; Sipos, Áron; Najafi, Faraz; Hu, Xiaolong; Berggren, Karl K. (Optical Society of America, 2011-10)
    A finite-element method for calculating the illumination-dependence of absorption in three-dimensional nanostructures is presented based on the radio frequency module of the Comsol Multiphysics software package (Comsol ...
  • Miyasaka, Hiromasa; Bachetti, Matteo; Harrison, Fiona A.; Barret, Didier; Bellm, Eric C.; Boggs, Steven E.; Chakrabarty, Deepto; Chenevez, Jerome; Christensen, Finn E.; Craig, William W.; Grefenstette, Brian W.; Hailey, Charles J.; Madsen, Kristin K.; Natalucci, Lorenzo; Pottschmidt, Katja; Stern, Daniel; Tomsick, John A.; Walton, Dominic J.; Zhang, William; Furst, Felix; Wilms, Jorn (IOP Publishing, 2013-09)
    The Nuclear Spectroscopic Telescope Array hard X-ray telescope observed the transient Be/X-ray binary GS 0834–430 during its 2012 outburst—the first active state of this system observed in the past 19 yr. We performed ...
  • Pottschmidt, Katja; Kennea, Jamie; Bachetti, Matteo; Bellm, Eric; Boggs, Steven E.; Chakrabarty, Deepto; Christensen, Finn E.; Craig, William W.; Hailey, Charles J.; Harrison, Fiona; Stern, Daniel; Tomsick, John A.; Walton, Dominic J.; Zhang, William; Furst, Felix; Wilms, Jorn (IOP Publishing, 2014-03)
    We present a spectral analysis of three simultaneous Nuclear Spectroscopy Telescope Array and Swift/XRT observations of the transient Be-neutron star binary KS 1947+300 taken during its outburst in 2013/2014. These broadband ...
  • Miller, J. M.; Parker, M. L.; Fuerst, F.; Bachetti, M.; Harrison, F. A.; Barret, D.; Boggs, S. E.; Christensen, F. E.; Craig, W. W.; Fabian, A. C.; Grefenstette, B. W.; Hailey, C. J.; King, A. L.; Stern, D. K.; Tomsick, J. A.; Walton, D. J.; Zhang, W. W.; Chakrabarty, Deepto (IOP Publishing, 2013-09)
    We report on the results of spectral fits made to a NuSTAR observation of the black hole GRS 1915+105 in a "plateau" state. This state is of special interest because it is similar to the "low/hard" state seen in other black ...
  • Wurtman, Richard Jay (MDPI AG, 2014-04)
    Brain neurons form synapses throughout the life span. This process is initiated by neuronal depolarization, however the numbers of synapses thus formed depend on brain levels of three key nutrients—uridine, the omega-3 ...
  • Wang, Jue D.; Sanders, Glenn M.; Grossman, Alan D. (Elsevier, 2007-03)
    DNA replication is highly regulated in most organisms. Although much research has focused on mechanisms that regulate initiation of replication, mechanisms that regulate elongation of replication are less well understood. ...
  • Berman, Piotr; Demaine, Erik D.; Zadimoghaddam, Morteza (Springer Berlin / Heidelberg, 2011-08)
    We develop constant-factor approximation algorithms for minimizing the maximum movement made by pebbles on a graph to reach a configuration in which the pebbles form a connected subgraph (connectivity), or interconnect a ...
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