Browsing FAS Scholarly Articles by Title

Now showing items 11137-11156 of 18304

    • Nucleotide-dependent Domain Movement in the ATPase Domain of a Human Type IIA DNA Topoisomerase 

      Wei, Hua; Ruthenburg, Alexander J.; Bechis, Seth K.; Verdine, Gregory L. (American Society for Biochemistry and Molecular Biology, 2005)
      Type IIA DNA topoisomerases play multiple essential roles in the management of higher-order DNA structure, including modulation of topological state, chromosome segregation, and chromatin condensation. These diverse ...

    • Number estimation relies on a set of segmented objects 

      Franconeri, Steven L.; Bemis, Douglas K.; Alvarez, George Angelo (Elsevier BV, 2009)
      How do we estimate the number of objects in a set? Two types of visual representations might underlie this ability – an unsegmented visual image or a segmented collection of discrete objects. We manipulated whether individual ...

    • The Number of Attentional Foci and Their Precision Are Dissociated in the Posterior Parietal Cortex 

      Shim, W. M.; Alvarez, George Angelo; Vickery, T. J.; Jiang, Y. V. (Oxford University Press (OUP), 2009)
      Many everyday tasks require us to track moving objects with attention. The demand for attention increases both when more targets are tracked and when the targets move faster. These 2 aspects of attention—assigning multiple ...

    • A Number of Scenes in a Badly Cut Film: Observation in the Age of Strobe 

      Canales, Jimena (University of Chicago Press, 2011)

    • Number-Space Mapping in Human Infants 

      de Hevia, Maria Dolores; Spelke, Elizabeth S. (Association for Psychological Science, 2010)
      Mature representations of number are built on a core system of numerical representation that connects to spatial representations in the form of a mental number line. The core number system is functional in early infancy, ...

    • Numeral Graphic Pluralism in the Colonial Andes 

      Urton, Gary (Duke University Press, 2010)
      What was the meaning, for Inca record keepers, of the knotted cord constructions they produced as administrative records for the Inca state? In particular, how did these administrators think about the knot constructions ...

    • Numeric Comparison in a Visually-guided Manual Reaching Task 

      Song, Joo-Hyun; Nakayama, Ken (Elsevier, 2008)
      Nearly all studies on perception and cognition have used discrete responses to infer internal cognitive processes. In the current study, we demonstrate that visually-guided manual reaching can provide new opportunities to ...

    • Numerical Convergence in Smoothed Particle Hydrodynamics 

      Zhu, Qirong; Hernquist, Lars; Li, Yuexing (American Astronomical Society, 2015)
      We study the convergence properties of smoothed particle hydrodynamics (SPH) using numerical tests and simple analytic considerations. Our analysis shows that formal numerical convergence is possible in SPH only in the ...

    • Numerical simulation of conformational variability in biopolymer translocation through wide nanopores 

      Fyta, Maria; Melchionna, Simone; Bernaschi, Massimo; Kaxiras, Efthimios; Succi, Sauro (IOP Publishing, 2009)
      Numerical results on the translocation of long biopolymers through mid-sized and wide pores are presented. The simulations are based on a novel methodology which couples molecular motion to a mesoscopic fluid solvent. ...

    • Numerical Simulation of Cropping 

      Tvergaard, Viggo; Hutchinson, John Woodside (ASME International, 2014)
      Cropping is a cutting process whereby opposing aligned blades create a shearing failure by exerting opposing forces normal to the surfaces of a metal sheet or plate. Building on recent efforts to quantify cropping, this ...

    • Numerical Simulation of Hot Accretion Flows. III. Revisiting Wind Properties Using the Trajectory Approach 

      Yuan, Feng; Gan, Zhaoming; Narayan, Ramesh; Sadowski, Aleksander; Bu, Defu; Bai, Xue-Ning (IOP Publishing, 2015)
      Previous MHD simulations have shown that wind must exist in black hole hot accretion flows. In this paper, we continue our study by investigating the detailed properties of wind and the mechanism of wind production. For ...

    • Numerical Simulations of Convective Accretion Flows in Three Dimensions 

      Igumenshchev, Igor V.; Abramowicz, Marek A.; Narayan, Ramesh (American Astronomical Society, 2000)
      Advection-dominated accretion flows (ADAFs) are known to be convectively unstable for low values of the viscosity parameter a. Two-dimensional axisymmetric hydrodynamic simulations of such flows reveal a radial density ...

    • Numerical simulations of super-critical black hole accretion flows in general relativity 

      Sadowski, A.; Narayan, Ramesh; McKinney, J. C.; Tchekhovskoy, A. (Oxford University Press (OUP), 2014)
      A new general relativistic radiation magnetohydrodynamical code KORAL is described, which employs the M1 scheme to close the radiation moment equations. The code has been successfully verified against a number of tests. ...

    • Numerical studies of relativistic jets 

      Narayan, Ramesh; Tchekhovskoy, A.; McKinney, J. (2010)
      The connection between collimation and acceleration of magnetized relativistic jets is discussed. The focus is on recent numerical simulations which shed light on some longstanding problems.

    • Numerical study of fermion and boson models with infinite-range random interactions 

      Fu, Wenbo; Sachdev, Subir (American Physical Society (APS), 2016)
      We present numerical studies of fermion and boson models with random all-to-all interactions (the SYK models). The high temperature expansion and exact diagonalization of the N-site fermion model are used to compute the ...

    • The NuMI neutrino beam 

      Adamson, P.; Anderson, K.; Andrews, M.; Andrews, R.; Anghel, I.; Augustine, D.; Aurisano, A.; Avvakumov, S.; Ayres, D.S.; Baller, B.; Barish, B.; Barr, G.; Barrett, W.L.; Bernstein, R.H.; Biggs, J.; Bishai, M.; Blake, A.; Bocean, V.; Bock, G.J.; Boehnlein, D.J.; Bogert, D.; Bourkland, K.; Cao, S.V.; Castromonte, C.M.; Childress, S.; Choudhary, B.C.; Coelho, J.A.B.; Cobb, J.H.; Corwin, L.; Crane, D.; Cravens, J.P.; Cronin-Hennessy, D.; Ducar, R.J.; De Jong, J.K.; Devan, A.V.; Devenish, N.E.; Diwan, M.V.; Erwin, A.R.; Escobar, C.O.; Evans, J.J.; Falk, E.; Feldman, Gary J.; Fields, T.H.; Ford, R.; Frohne, M.V.; Gallagher, H.R.; Garkusha, V.; Gomes, R.A.; Goodman, M.C.; Gouffon, P.; Graf, N.; Gran, R.; Grossman, N.; Grzelak, K.; Habig, A.; Hahn, S.R.; Harding, D.; Harris, D.; Harris, P.G.; Hartnell, J.; Hatcher, R.; Hays, S.; Heller, K.; Holin, A.; Huang, J.; Hylen, J.; Ibrahim, A.; Indurthy, D.; Irwin, G.M.; Isvan, Z.; Jaffe, D.E.; James, C.; Jensen, D.; Johnstone, J.; Kafka, T.; Kasahara, S.M.S.; Koizumi, G.; Kopp, S.; Kordosky, M.; Kreymer, A.; Lang, K.; Laughton, C.; Lefeuvre, G.; Ling, J.; Litchfield, P.J.; Loiacono, L.; Lucas, P.; Mann, W.A.; Marchionni, A.; Marshak, M.L.; Mayer, N.; McGivern, C.; Medeiros, M.M.; Mehdiyev, R.; Meier, J.R.; Messier, M.D.; Michael, D.G.; Milburn, R.H.; Miller, J.L.; Miller, W.H.; Mishra, Shruti; Moed Sher, S.; Moore, C.D.; Morfín, J.; Mualem, L.; Mufson, S.; Murgia, S.; Murtagh, M.; Musser, J.; Naples, D.; Nelson, J.K.; Newman, H.B.; Nichol, R.J.; Nowak, J.A.; O?Connor, J.; Oliver, W.P.; Olsen, M.; Orchanian, M.; Osprey, S.; Pahlka, R.B.; Paley, J.; Para, A.; Patterson, R.B.; Patzak, T.; Pavlović, Z.; Pawloski, G.; Perch, A.; Peterson, E.A.; Petyt, D.A.; Pfützner, M.M.; Phan-Budd, S.; Plunkett, R.K.; Poonthottathil, N.; Prieto, P.; Pushka, D.; Qiu, X.; Radovic, A.; Rameika, R.A.; Ratchford, J.; Rebel, B.; Reilly, R.; Rosenfeld, C.; Rubin, H.A.; Ruddick, K.; Sanchez, M.C.; Saoulidou, N.; Sauer, L.; Schneps, J.; Schoo, D.; Schreckenberger, A.; Schreiner, P.; Shanahan, P.; Sharma, R.; Smart, W.; Smith, C.; Sousa, A.; Stefanik, A.; Tagg, N.; Talaga, R.L.; Tassotto, G.; Thomas, J.; Thompson, J.; Thomson, M.A.; Tian, X.; Timmons, A.; Tinsley, D.; Tognini, S.C.; Toner, Ruth; Torretta, D.; Trostin, I.; Tzanakos, G.; Urheim, J.; Vahle, P.; Vaziri, K.; Villegas, E.; Viren, B.; Vogel, G.; Webber, R.C.; Weber, A.; Webb, R.C.; Wehmann, A.; White, C.; Whitehead, L.; Whitehead, L.H.; Wojcicki, S.G.; Wong-Squires, M.L.; Yang, T.; Yumiceva, F.X.; Zarucheisky, V.; Zwaska, R. (Elsevier BV, 2016)
      This paper describes the hardware and operations of the Neutrinos at the Main Injector (NuMI) beam at Fermilab. It elaborates on the design considerations for the beam as a whole and for individual elements. The most ...

    • Nurturing sustainability 

      Clark, William (2009)

    • NuSTAR and Chandra Observations of New X-Ray Transients in the Central Parsec of the Galaxy 

      Mori, Kaya; Hailey, Charles J.; Mandel, Shifra; Schutt, Yve E.; Bachetti, Matteo; Coerver, Anna; Baganoff, Frederick K.; Dykaar, Hannah; Grindlay, Jonathan; Haggard, Daryl; Heuer, Keri; Hong, Jaesub; Hord, Benjamin J.; Jin, Chichuan; Nynka, Melania; Ponti, Gabriele; Tomsick, John A. (American Astronomical Society, 2019-11-11)
      We report NuSTAR and Chandra observations of two X-ray transients, SWIFT J174540.7−290015 (T15) and SWIFT J174540.2−290037 (T37), which were discovered by the Neil Gehrels Swift Observatory in 2016 within r ∼ 1 pc of Sgr ...

    • NuSTAR Hard X-ray Survey of the Galactic Center Region I: Hard X-ray Morphology and Spectroscopy of the Diffuse Emission 

      Mori, Kaya; Hailey, Charles J.; Krivonos, Roman; Hong, Jaesub; Ponti, Gabriele; Bauer, Franz; Perez, Kerstin; Nynka, Melania; Zhang, Shuo; Tomsick, John A.; Alexander, David M.; Baganoff, Frederick K.; Barret, Didier; Barrière, Nicolas; Boggs, Steven E.; Canipe, Alicia M.; Christensen, Finn E.; Craig, William W.; Forster, Karl; Giommi, Paolo; Grefenstette, Brian W.; Grindlay, Jonathan E.; Harrison, Fiona A.; Hornstrup, Allan; Kitaguchi, Takao; Koglin, Jason E.; Luu, Vy; Madsen, Kristen K.; Mao, Peter H.; Miyasaka, Hiromasa; Perri, Matteo; Pivovaroff, Michael J.; Puccetti, Simonetta; Rana, Vikram; Stern, Daniel; Westergaard, Niels J.; Zhang, William W.; Zoglauer, Andreas (IOP Publishing, 2015)
      We present the first sub-arcminute images of the Galactic Center above 10 keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGR J17456–2901 into non-thermal X-ray filaments, molecular clouds, point sources, ...

    • NuSTAR Hard X-ray Survey of the Galactic Center Region II: X-ray Point Sources 

      Hong, Jaesub; Mori, Kaya; Hailey, Charles J.; Nynka, Melania; Zhang, Shuo; Gotthelf, Eric; Fornasini, Francesca M.; Krivonos, Roman; Bauer, Franz; Perez, Kerstin; Tomsick, John A.; Bodaghee, Arash; Chiu, Jeng-Lun; Clavel, Maïca; Stern, Daniel; Grindlay, Jonathan E.; Alexander, David M.; Aramaki, Tsuguo; Baganoff, Frederick K.; Barret, Didier; Barrière, Nicolas; Boggs, Steven E.; Canipe, Alicia M.; Christensen, Finn E.; Craig, William W.; Desai, Meera A.; Forster, Karl; Giommi, Paolo; Grefenstette, Brian W.; Harrison, Fiona A.; Hong, Dooran; Hornstrup, Allan; Kitaguchi, Takao; Koglin, Jason E.; Madsen, Kristen K.; Mao, Peter H.; Miyasaka, Hiromasa; Perri, Matteo; Pivovaroff, Michael J.; Puccetti, Simonetta; Rana, Vikram; Westergaard, Niels J.; Zhang, William W.; Zoglauer, Andreas (American Astronomical Society, 2016)
      We present the first survey results of hard X-ray point sources in the Galactic Center (GC) region by NuSTAR. We have discovered 70 hard (3–79 keV) X-ray point sources in a 0.6 deg${}^{2}$ region around Sgr A* with a total ...