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Browsing Mathemateg a Ffiseg / Mathematics & Physics by Title

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  • 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 ...
  • Non-existence of polar factorisations and polar inclusion of a vector-valued mapping 
    Douglas, Robert J. (2007)
    This paper proves some results concerning the polar factorisation of an integrable vector-valued function $u$ into the composition $u = u^{\#} \circ s$, where $u^{\#} = \nabla \psi$ almost everywhere for some convex function ...
  • Non-tactical symmetric nets 
    Al-Kenani, A. N.; Mavron, Vassili C. (2003)
    Until recently, the known symmetric nets were class-regular and therefore satisfied a certain geometric condition that defines the class of nets known as tactical symmetric nets. Thus the known symmetric nets were tactical. ...
  • Numerical method for solving joint thermo-diffusive problems in an infinite combined domain with thin resistant interphase. 
    Mishuris, Gennady; Wrobel, M. (2009-07)
    This work deals with a class of Boundary Value Problems describing joint thermo-diffussive fields in an infinite combined domain, which consists of two subdomains, matched by a thin intermediate layer. The main problem is ...
  • Numerical Modelling of Mass Transfer Problems in Combined Domains with Non-linear Imperfect Transmission Conditions 
    Mishuris, Gennady; Wrobel, M. (2009-03)
    This work deals with a nonlinear mass transfer problem in an infinite combined domain, consisting of half-space matched to a bounded part via a thin intermediate layer. The latter exhibits high contrast material properties, ...
  • 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 ...
  • On affine designs and Hadamard designs with line spreads 
    McDonough, Thomas P.; Mavron, V. C.; Tonchev, V. D. (2008-07-06)
    Rahilly [On the line structure of designs, Discrete Math. 92 (1991) 291–303] described a construction that relates any Hadamard design H on 4^m-1 points with a line spread to an affine design having the same parameters as ...
  • On Lehner's `free' noncommutative analogue of the de Finetti theorem 
    Köstler, Claus (2011-01-31)
    Inspired by Lehner's results on exchangeability systems in [Leh06] we define `weak conditional freeness' and `conditional freeness' for stationary processes in an operator algebraic framework of noncommutative probability. ...
  • On quasi-symmetric designs with intersection difference three 
    Mavron, V. C.; McDonough, T. P.; Shrikhande, M. S. (2012-04)
    In a recent paper, Pawale [22] investigated quasi-symmetric 2-(v, k, lambda) designs with intersection numbers x > 0 and y = x + 2 with lambda > 1 and showed that under these conditions either lambda = x + 1 or lambda = x ...
  • On root subsystems and involutions in S_n 
    Deriziotis, D.; Pallikaros, C. A.; McDonough, Thomas P. (2010)
    Given an involution z in W, where W is the symmetric group of degree n, we study the relation between the subsystems of a root system for W corresponding to certain decreasing subsequences of z and the two-sided Kazhdan¿Lusztig ...
  • On structure-preserving transformations of the Itō generator matrix for model reduction of quantum feedback networks 
    Gough, John Edward; Nurdin, H. I. (2012-11-28)
    Two standard operations of model reduction for quantum feedback networks, elimination of internal connections under the instantaneous feedback limit and adiabatic elimination of fast degrees of freedom, are cast as ...
  • On subsequences and certain elements which determine various cells in S_n 
    Pallikaros, C. A.; McDonough, Thomas P. (2008-02-01)
    We study the relation between certain increasing and decreasing subsequences occurring in the row form of certain elements in the symmetric group, following Schensted [C. Schensted, Longest increasing and decreasing ...
  • On the effectiveness of a quasistatic bubble-scale simulation in predicting the constriction flow of a two-dimensional foam 
    Jones, Sian Angharad; Cox, Simon (2012-04-04)
    A comprehensive set of experiments on a two-dimensional constriction flow of a foam are described. Image analysis of the flow is used to ascertain bubble shape and flow dynamics. The bubble velocity, elongation (texture), ...
  • On the evaluation of mechanical properties from the axisymmetric tensile test 
    Oechsner, Andreas; Gromada, Magdalena; Mishuris, Gennady (2011-09-06)
    This paper deals with analytical modelling of the classical tensile test which is still considered as one of the main experimental procedures to determine the flow curve of elasto-plastic materials. Accurate numerical ...
  • On the positivity of the Jansen-Heß operator for arbitrary mass 
    Iantchenko, A.; Jakubaßa-Amundsen, D. H. (2003-12)
    The Jansen-Heß operator is an approximate (pseudo-)relativistic no-pair Hamiltonian in the Furry picture which is used in the physics literature to describe heavy atoms. Within the single-particle Coulomb model we prove ...
  • On the structure of quasi-two-dimensional foams 
    Janiaud, Eric; Cox, Simon (2008-09-01)
    Bubble monolayers are widely used to probe the rheology of aqueous foams, and liquid content plays an important role in the response. We analyse the liquid distribution within three different types of two-dimensional foam, ...
  • 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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