63,319 research outputs found

    A summary of NASTRAN fluid/structure interaction capabilities

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    A summary of fluid/structure interaction capabilities for the NASTRAN computer program is presented. Indirect applications of the program towards solving this class of problem were concentrated on. For completeness and comparitive purposes, direct usage of NASTRAN is briefly discussed. The solution technology addresses both steady state and transient dynamic response problems

    On fiber diameters of continuous maps

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    We present a surprisingly short proof that for any continuous map f:RnRmf : \mathbb{R}^n \rightarrow \mathbb{R}^m, if n>mn>m, then there exists no bound on the diameter of fibers of ff. Moreover, we show that when m=1m=1, the union of small fibers of ff is bounded; when m>1m>1, the union of small fibers need not be bounded. Applications to data analysis are considered.Comment: 6 pages, 2 figure

    Search on a Hypercubic Lattice through a Quantum Random Walk: II. d=2

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    We investigate the spatial search problem on the two-dimensional square lattice, using the Dirac evolution operator discretised according to the staggered lattice fermion formalism. d=2d=2 is the critical dimension for the spatial search problem, where infrared divergence of the evolution operator leads to logarithmic factors in the scaling behaviour. As a result, the construction used in our accompanying article \cite{dgt2search} provides an O(NlogN)O(\sqrt{N}\log N) algorithm, which is not optimal. The scaling behaviour can be improved to O(NlogN)O(\sqrt{N\log N}) by cleverly controlling the massless Dirac evolution operator by an ancilla qubit, as proposed by Tulsi \cite{tulsi}. We reinterpret the ancilla control as introduction of an effective mass at the marked vertex, and optimise the proportionality constants of the scaling behaviour of the algorithm by numerically tuning the parameters.Comment: Revtex4, 5 pages (v2) Introduction and references expanded. Published versio

    Flux Tube Model Signals for Baryon Correlations in Heavy Ion Collisions

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    The flux tube model offers a pictorial description of what happens during the deconfinement phase transition in QCD. The 3-point vertices of a flux tube network lead to formation of baryons upon hadronisation. Therefore, correlations in the baryon number distribution at the last scattering surface are related to the preceding pattern of the flux tube vertices, and provide a signature of the nearby deconfinement phase transition. I discuss the nature of the expected signal, which should be observable in heavy ion collisions at RHIC and LHC.Comment: LaTeX, 9 pages, 5 figures, (v2) Several arguments expanded for clarity, (v3) Minor typesetting changes, published versio

    Listing of solar radiation measuring equipment and glossary

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    An attempt is made to list and provide all available information about solar radiation measuring equipment which are being manufactured and are available on the market. The list is in tabular form and includes sensor type, response time, cost data and comments for each model. A cost code is included which shows ranges only
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