Browsing Mathematics and Physics by Title

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Browsing Mathematics and Physics by Title

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  • LOCALIZED ENHANCEMENTS OF Fe+10 DENSITY IN THE CORONA AS OBSERVED IN Fe xi 789.2 nm DURING THE 2006 MARCH 29 TOTAL SOLAR ECLIPSE 
    Johnson, Judd; Arndt, Martina Belz; Morgan, Huw; Daw, Adrian; Mickey, Don; Habbal, Shadia Rifai; Jaeggli, Sarah; Kuhn, Jeff (2007-07)
    The first image of the full solar corona in the Fe XI 789.2 nm spectral line, acquired during the total solar eclipse of 29 March 2006, with a sequence of 7, 2 and 0.5 second exposures, revealed a surprisingly extended ...
  • Locating hexagonal and cubic phases in boron nitride using wavelength-selective optically detected x-ray absorption spectroscopy 
    Poolton, Nigel; Evans, Andrew; Vearey-Roberts, Alex R.; Evans, David Andrew (2006-10-17)
    Cubic and hexagonal phases of boron nitride (c-BN and h-BN) have been identified and located using optically detected x-ray absorption spectroscopy (ODXAS). Each phase was identified by distinct resonance features in the ...
  • The magnetic structure of a coronal X-ray bright point 
    Golub, Leon; Brown, Daniel; DeLuca, Ed; McMullen, Rebecca; Parnell, Clare (2001)
    Abstract. X-ray bright points are small dynamic loop structures that are observed all over the solar corona. The high spatial and temporal resolution of the TRACE instrument allows bright points to be studied in much greater ...
  • Maximal L p -regularity for the Laplacian on Lipschitz domains 
    Wood, Ian (2007-04)
    We consider the Laplacian with Dirichlet or Neumann boundary conditions on bounded Lipschitz domains Ω, both with the following two domains of definition: D1(Δ)={u∈W1,p(Ω):Δu∈Lp(Ω), Bu=0} , or D2(Δ)={u∈W2,p(Ω):Bu=0} , where ...
  • An MCP based detector array with integrated electronics 
    Langstaff, David (2002-04-01)
    Various position sensitive readout systems for microchannel plates are considered. A discrete anode detector with 192 channels and integrated data acquisition electronics developed at the University of Wales, Aberystwyth ...
  • The mechanical and thermal structure of Mercury's early lithosphere 
    Schultz, R. A.; Watters, T. R.; Cook, Anthony; Robinson, M. S. (2002-06)
    Insight into the mechanical and thermal structure of Mercury's early lithosphere has been obtained from forward modeling of the largest lobate scarp known on the planet. Our modeling indicates the structure overlies a ...
  • Modeling subauroral polarization streams equatorward of the plasmapause footprints 
    Balthazor, R. L.; Pintér, Balázs; Thom, S. D.; Vo, H.; Bailey, G. J. (2006-10)
    We report on a modeling study on the effects of subauroral polarization stream (SAPS) events equatorward of the plasmapause footprints, using the Sheffield Coupled Thermosphere-Ionosphere-Plasmasphere (CTIP) model. SAPS ...
  • Modeling subauroral polarization streams equatorward of the plasmapause footprints 
    Pintér, Balázs; Vo, H.; Thom, S.; Balthazor, R. L. (American Geophysical Union, 2006)
    We report on a modeling study on the effects of subauroral polarization stream (SAPS) events equatorward of the plasmapause footprints, using the Sheffield Coupled Thermosphere-Ionosphere-Plasmasphere (CTIP) model. SAPS ...
  • Modification of GaAs Schottky diodes by thin organic interlayers 
    Evans, Andrew; Vearey-Roberts, Alex R. (2005-02-10)
    Control of the interfacial potential barrier for metal/n-GaAs diodes has been achieved using thin interlayers of the organic semiconductor, tin phthalocyanine (SnPc). The I-V characteristics for organic-modified Ag/S:GaAs ...
  • A multichannel detector array with 768 pixels developed for electron spectroscopy 
    Langstaff, David; Chase, Thomas Robert (Elsevier, 2007-04)
    A one dimensional detector array using MCP technology in conjunction with a custom ASIC is presented. The ASIC features 768 pixels, each 3mm in length on a pitch of 25µm, giving a length in the dispersive direction of 19.2 ...
  • A multichannel detector array with 768 pixels developed for electron spectroscopy 
    Chase, Thomas Robert; Langstaff, David (2007-04-01)
    A one-dimensional detector array using MCP technology in conjunction with a custom ASIC is presented. The ASIC features 768 pixels, each 3 mm in length on a pitch of 25 μm, giving a length in the dispersive direction of ...
  • Na-23, Si-29, and C-13 MAS NMR investigation of glass-forming reactions between Na2CO3 and SiO2 
    Winter, Rudolf; Smith, I. H.; Jones, Aled R.; Greaves, G. N. (2005)
    The glass-forming reactions between sodium carbonate (Na2CO3) and silica (SiO2) have been investigated by 23Na, 29Si, and 13C magic-angle spinning (MAS) NMR spectroscopy. The multinuclear MAS NMR approach identifies and ...
  • New instrumentation for micro-imaging X-ray absorption spectroscopy using optical detection methods 
    Poolton, Nigel; Evans, D. A.; Hamilton, B.; Towlson, B. M. (2006-05)
    The design and use of a novel portable synchrotron end-station is described, that allows for the micro-imaging of X-ray absorption features of solids, via their luminescence emission. This mode of measurement is possible ...
  • Newton's aerodynamic problem in media of chaotically moving particles 
    Plakhov, A. Y.; Torres, D. (2005-06-01)
    The problem of minimum resistance is studied for a body moving with constant velocity in a rarefied medium of chaotically moving point particles in the Euclidean space . The distribution of the velocities of the particles ...
  • Noncommutative Independence from the Braid Group B∞ 
    Gohm, Rolf; Koestler, Claus (2009-07-01)
    We introduce `braidability' as a new symmetry for (infinite) sequences of noncommutative random variables related to representations of the braid group $B_\infty$. It provides an extension of exchangeability which is tied ...
  • Noncommutative independence in the infinite braid and symmetric group 
    Köstler, Claus; Gohm, Rolf (2012-11-07)
    This is an introductory paper about our recent merge of a noncommutative de Finetti type result with representations of the infinite braid and symmetric group which allows to derive factorization properties from symmetries. ...
  • Non-commutative Markov chains and multi-analytic operators 
    Gohm, Rolf (2010-04-01)
    We study a model of repeated interaction between quantum systems which can be thought of as a non-commutative Markov chain. It is shown that there exists an outgoing Cuntz scattering system associated to this model which ...
  • Non-commutative symbolic coding 
    Kummerer, B.; Gohm, Rolf; Lang, T. (2006)
    We give a non-commutative generalization of classical symbolic coding in the presence of a synchronizing word. This is done by a scattering theoretical approach. Classically, the existence of a synchronizing word turns out ...
  • Observations of rotating sunspots from TRACE 
    Title, Alan; Carolus, Thomas; Shine, Richard; Wolfson, C. Jacob; Nightingale, Richard; Schrijver, Carolus; Brown, Daniel; Alexander, David (2003)
    Recent observations from TRACE in the photospheric white light channel have shown sunspots that rotate up to 200° about their umbral centre over a period of 3-5 days. The corresponding loops in the coronal fan are often ...
  • Opportunities for X-ray remote sensing at Mercury 
    Kellett, B.; Dunkin, S. K.; Grande, Manuel (2001)
    Mercury is the little known innermost terrestrial planet. A number of significant questions remain unanswered. We describe areas in which a compact imaging X-ray spectrometer could make a valuable contribution. It can ...

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