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Browsing MIT Open Access Articles by Title

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  • Direct CP, Lepton Flavor, and Isospin Asymmetries in the Decays B-->K(*)l+l- 
    Cowan, Ray Franklin; Spitznagel, M.; Sciolla, Gabriella; Fisher, Peter H.; Koeneke, K.; Taylor, Frank E.; Dujmic, Denis; Yamamoto, R. K.; Zhao, M. (American Physical Society, 2009-03)
    We measure branching fractions and integrated rate asymmetries for the rare decays B→K(*)l+l-, where l+l- is either e+e- or μ+μ-, using a sample of 384×10(6) BB̅ events collected with the BABAR detector at the PEP-II e+e- ...
  • Direct Democracy and Local Public Goods: Evidence from a Field Experiment in Indonesia 
    Olken, Benjamin A. (Cambridge University Press, 2010-05)
    This article presents an experiment in which 49 Indonesian villages were randomly assigned to choose development projects through either representative-based meetings or direct election-based plebiscites. Plebiscites ...
  • Direct Detection of Nitroxyl in Aqueous Solution using a Tripodal Copper(II) BODIPY Complex 
    Rosenthal, Joel; Lippard, Stephen J. (American Chemical Society, 2009-10)
    Nitric oxide (NO) mediates both physiological and pathological processes.1,2 In addition to cardiovascular signaling, NO has been invoked to play a neurochemical role in learning and memory, and it is a powerful necrotic ...
  • Directed and elliptic flow of charged particles in Cu + Cu collisions at √[superscript s][subscript NN]=22.4 GeV 
    Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Leight, William Axel; Milner, Richard G.; Redwine, Robert P.; Seele, J.; Steadman, Stephen G.; Surrow, Bernd; van Nieuwenhuizen, Gerrit Jan; Walker, Margaret R. (American Physical Society, 2012-01)
    This paper reports results for directed flow v[subscript 1] and elliptic flow v[subscript 2] of charged particles in Cu + Cu collisions at √[superscript s][subscript NN]=22.4 GeV at the Relativistic Heavy Ion Collider. The ...
  • Directed evolution of a magnetic resonance imaging contrast agent for noninvasive imaging of dopamine 
    Shapiro, Mikhail G.; Westmeyer, Gil Gregor; Szablowski, Jerzy O.; Küster, Benedict; Shah, Ameer; Langer, Robert; Jasanoff, Alan Pradip; Romero, Philip A.; Arnold, Frances H.; Otey, Christopher R. (Nature Publishing Company, 2010-02)
    The development of molecular probes that allow in vivo imaging of neural signaling processes with high temporal and spatial resolution remains challenging. Here we applied directed evolution techniques to create magnetic ...
  • Directed Flow of Identified Particles in Au+Au Collisions at √SNN=200  GeV at RHIC 
    Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Leight, William Axel; Redwine, Robert P.; Seele, Joseph Patrick; Steadman, Stephen G.; Surrow, Bernd; van Nieuwenhuizen, Gerrit Jan (American Physical Society, 2012-05)
    STAR’s measurements of directed flow (v[subscript 1]) around midrapidity for π[superscript ±], K[superscript ±], K[subscript S][superscript 0], p, and p̅ in Au+Au collisions at √s[subscript NN]=200  GeV are presented. A ...
  • Direct estimation of evoked hemoglobin changes by multimodality fusion imaging 
    Huppert, Theodore J.; Diamond, Solomon G.; Boas, David A. (SPIE - International Society for Optical Engineering, 2008-10)
    In the last two decades, both diffuse optical tomography (DOT) and blood oxygen level dependent (BOLD)-based functional magnetic resonance imaging (fMRI) methods have been developed as noninvasive tools for imaging evoked ...
  • Direct Evidence for Effects of Grain Structure on Reversible Compressive Deposition Stresses in Polycrystalline Gold Films 
    Thompson, Carl V.; Monig, R.; Leib, J. (American Physical Society, 2009-06)
    A component of the compressive stress that develops during deposition of polycrystalline thin films reversibly changes during interruptions of growth. The mechanism responsible for this phenomenon has been the subject of ...
  • Direct evidence of memory retrieval as a source of difficulty in non-local dependencies in language 
    Gibson, Edward (John Wiley & Sons, Inc., )
  • Direct imaging and spectroscopy of habitable planets using JWST and a starshade 
    Soummer, Rémi; Valenti, Jeff; Brown, Robert A.; Tumlinson, Jason; Postman, Marc; Mountain, Matt; Seager, Sara; Cash, Webster; Jordan, Ian; Glassman, Tiffany; Pueyo, Laurent; Roberge, Aki (Society of Photo-optical Instrumentation Engineers, 2010-06)
    A starshade with the James Webb Space Telescope (JWST) is the only possible path forward in the next decade to obtain images and spectra of a planet similar to the Earth, to study its habitability, and search for signs of ...
  • Directional Limits on Persistent Gravitational Waves Using LIGO S5 Science Data 
    Barnum, Sam; Barsotti, Lisa; Blackburn, Lindy L.; Bodiya, Timothy Paul; Corbitt, Thomas R.; Donovan, Frederick J.; Evans, Matthew J.; Foley, Stephany; Fritschel, Peter K.; Harry, G. M.; Hughey, Barbara J.; Katsavounidis, Erotokritos; MacInnis, Myron E.; Mason, Kenneth R.; Matichard, Fabrice; Mavalvala, Nergis; Mittleman, Richard K.; Shapiro, B.; Shoemaker, David H.; Smith, N. D.; Stein, Andrew J.; Stein, Leo Chaim; Waldman, Samuel J.; Weiss, R.; Wipf, Christopher C.; Zucker, Michael E. (American Physical Society (APS), 2011-12)
    The gravitational-wave (GW) sky may include nearby pointlike sources as well as stochastic backgrounds. We perform two directional searches for persistent GWs using data from the LIGO S5 science run: one optimized for ...
  • Directional solvent for membrane-free water desalination-A molecular level study 
    Luo, Tengfei; Bajpayee, Anurag; Chen, Gang (American Institute of Physics, 2011-09)
    Development of desalination technologies has been identified as vital to fulfilling future water demand. In this paper, we use molecular simulation to demonstrate that decanoic acid can dissolve water but reject salt, and ...
  • Directional wavelet transforms for prediction residuals in video coding 
    Kamisli, Fatih; Lim, Jae S. (Institute of Electrical and Electronics Engineers, 2010-02)
    Various directional transforms have been developed recently to improve image compression. In video compression, however, prediction residuals of image intensities, such as the motion compensation residual or the resolution ...
  • Direct Measurement of Room-Temperature Nondiffusive Thermal Transport Over Micron Distances in a Silicon Membrane 
    Johnson, Jeremiah A.; Maznev, Alexei; Eliason, Jeffrey Kristian; Nelson, Keith Adam; Cuffe, John; Minnich, Austin J.; Kehoe, Timothy; Torres, Clivia M. Sotomayor; Chen, Gang (American Physical Society, 2013-01)
    The “textbook” phonon mean free path of heat carrying phonons in silicon at room temperature is ∼40  nm. However, a large contribution to the thermal conductivity comes from low-frequency phonons with much longer mean free ...
  • Direct Measurement of the W Production Charge Asymmetry in p(p)over-bar Collisions at root s = 1.96 TeV 
    Paus, Christoph M. E.; Gomez-Ceballos, Guillelmo; Henderson, C.; Choudalakis, Georgios; Knuteson, Bruce O.; Hahn, Kristian Allan; Goncharov, Maxim; Makhoul, K.; Xie, Si; Bauer, Gerry P. (American Physical Society, 2009-03)
    We present the first direct measurement of the W production charge asymmetry as a function of the W boson rapidity yW in p(p)over-bar collisions at √s=1.96  TeV. We use a sample of W→eν events in data from 1  fb[superscript ...
  • Direct numerical simulation of electroconvective instability and hysteretic current-voltage response of a permselective membrane 
    Pham, Van Sang; Li, Zirui; Lim, Kian Meng; White, Jacob K.; Han, Jongyoon (American Physical Society, 2012-10)
    We present a systematic, multiscale, fully detailed numerical modeling for dynamics of fluid flow and ion transport covering Ohmic, limiting, and overlimiting current regimes in conductance of ion-selective membrane. By ...
  • Direct observation of a dispersionless impurity band in hydrogenated graphene 
    Haberer, D.; Petaccia, L.; Farjam, M.; Taioli, S.; Jafari, S. A.; Nefedov, A.; Zhang, W.; Calliari, L.; Scarduelli, G.; Dora, B.; Vyalikh, D. V.; Pichler, T.; Woll, Ch.; Alfe, D.; Simonucci, S.; Dresselhaus, Mildred; Knupfer, M.; Buchner, B.; Gruneis, A. (American Physical Society, 2011-04)
    We show with angle-resolved photoemission spectroscopy that a new energy band appears in the electronic structure of electron-doped hydrogenated monolayer graphene (H-graphene). Its occupation can be controlled with the ...
  • Direct observation of closed-loop ferrohydrodynamic pumping under traveling magnetic fields 
    Elborai, Shihab; He, Xiaowei; Zahn, Markus; Mao, Leidong; Koser, Hur (American Physical Society (APS), 2011-09)
    Ferrofluid-based liquid manipulation schemes typically actuate an immiscible liquid via a ferrofluid plug, using high magnetic flux (∼1 T) densities and strong field gradients created with bulky permanent magnets. They ...
  • Direct observation of spin-polarized surface states in the parent compound of a topological insulator using spin- and angle-resolved photoemission spectroscopy in a Mott-polarimetry mode 
    Hsieh, David; Wray, L.; Qian, D.; Xia, Y.; Dil, J. H.; Meier, F.; Patthey, L.; Osterwalder, J.; Bihlmayer, G.; Hor, Y. S.; Cava, R. J.; Hasan, M. Z. (Institute of Physics Publishing, 2010-12)
    We report high-resolution spin-resolved photoemission spectroscopy (spin-ARPES) measurements on the parent compound Sb of the recently discovered three-dimensional topological insulator Bi1−xSbx (Hsieh et al 2008 Nature ...
  • Directoryless shared memory coherence using execution migration 
    Lis, Mieszko; Shim, Keun Sup; Cho, Myong Hyon; Khan, Omer; Devadas, Srinivas (ACTA Press, 2011-12)
    We introduce the concept of deadlock-free migration-based coherent shared memory to the NUCA family of architectures. Migration-based architectures move threads among cores to guarantee sequential semantics in large ...
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