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Published Articles

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2015-08-27
07:57
Subcritical versus supercritical transition to turbulence in curved pipes / Kühnen, J ; Braunshier, P ; Schwegel, M ; Kuhlmann, H ; Hof, B
Transition to turbulence in straight pipes occurs in spite of the linear stability of the laminar Hagen--Poiseuille flow if the amplitude of flow perturbations as well as the Reynolds number exceed a minimum threshold (subcritical transition). As the pipe curvature increases centrifugal effects become important, modifying the basic flow as well as the most unstable linear modes. [...]
arXiv:1508.06559.- 2015 - Published in : J. Fluid Mech. 770, May 2015, R3 External link: Preprint

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2015-08-27
07:57
Experimental investigation of transitional flow in a toroidal pipe / Kühnen, J ; Holzner, M ; Hof, B ; Kuhlmann, H
The flow instability and further transition to turbulence in a toroidal pipe (torus) with curvature (tube-to-coiling diameter) 0.049 is investigated experimentally. The flow inside the toroidal pipe is driven by a steel sphere fitted to the inner pipe diameter. [...]
arXiv:1508.06546.- 2015 - Published in : Journal of Fluid Mechanics, Volume 738, January 2014, pp 463- 491 External link: Preprint

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2015-08-27
07:57
Network Community Detection on Metric Space / Saha, Suman ; Ghrera, Satya P
Community detection in a complex network is an important problem of much interest in recent years. In general, a community detection algorithm chooses an objective function and captures the communities of the network by optimizing the objective function, and then, one uses various heuristics to solve the optimization problem to extract the interesting communities for the user. [...]
arXiv:1508.06380.- 2015 - Published in : Algorithms 8 (2015) 680-696 External link: Preprint

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2015-08-27
07:57
BREN: Body Reflection Essence-Neuter Model for Separation of Reflection Components / Je, Changsoo ; Park, Hyung-Min
We propose a novel reflection color model consisting of body essence and (mixed) neuter, and present an effective method for separating dichromatic reflection components using a single image. Body essence is an entity invariant to interface reflection, and has two degrees of freedom unlike hue and maximum chromaticity. [...]
arXiv:1508.06171.- 2015 - 4 p. - Published in : Optics Letters, Volume 40, Issue 9, pp. 1940-1943, May 1, 2015 External link: Preprint

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2015-08-27
07:57
A similarity-based community detection method with multiple prototype representation / Zhou, Kuang (DRUID) ; Martin, Arnaud (DRUID) ; Pan, Quan
Communities are of great importance for understanding graph structures in social networks. Some existing community detection algorithms use a single prototype to represent each group. [...]
arXiv:1508.06124.- 2015 - Published in : Physica A: Statistical Mechanics and its Applications, 2015, pp.519-531 External link: Preprint

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2015-08-27
07:57
Long range node-strut analysis of trabecular bone microarchitecture / Schmah, T ; Marwan, N ; Thomsen, J S ; Saparin, P
Purpose: We present a new morphometric measure of trabecular bone microarchitecture, called mean node strength (NdStr), which is part of a newly developed approach called long range node-strut analysis. Our general aim is to describe and quantify the apparent "latticelike" microarchitecture of the trabecular bone network. [...]
arXiv:1508.05970.- 2015 - Published in : Medical Physics, 38(9), 5003-5011 (2011) External link: Preprint

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2015-08-27
07:57
High-Contrast Color-Stripe Pattern for Rapid Structured-Light Range Imaging / Je, Changsoo ; Lee, Sang Wook ; Park, Rae-Hong
For structured-light range imaging, color stripes can be used for increasing the number of distinguishable light patterns compared to binary BW stripes. Therefore, an appropriate use of color patterns can reduce the number of light projections and range imaging is achievable in single video frame or in "one shot". [...]
arXiv:1508.04981.- 2015 - 13 p. - Published in : Computer Vision - ECCV 2004, LNCS 3021, pp. 95-107, Springer-Verlag Berlin Heidelberg, May 10, 2004 External link: Preprint

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2015-08-27
07:56
Recent direct reaction experimental studies with radioactive tin beams / Jones, K L ; Ahn, S ; Allmond, J M ; Ayres, A ; Bardayan, D W ; Baugher, T ; Bazin, D ; Berryman, J S ; Bey, A ; Bingham, C et al.
Direct reaction techniques are powerful tools to study the single-particle nature of nuclei. Performing direct reactions on short-lived nuclei requires radioactive ion beams produced either via fragmentation or the Isotope Separation OnLine (ISOL) method. [...]
arXiv:1508.06531.- 2015 - 11 p. - Published in : Acta Physica Polonica B, 46(3), 537-546 (2015) External link: Preprint

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2015-08-27
07:56
Quantum radiation from a particle in an accelerated motion coupled to vacuum fluctuations / Oshita, Naritaka ; Yamamoto, Kazuhiro ; Zhang, Sen
A particle in a uniformly accelerated motion exhibits Brownian random motions around the classical trajectory due to the coupling to the field vacuum fluctuations. Previous works show that the Brownian random motions satisfy the energy equipartition relation. [...]
arXiv:1508.06338.- 2015 - 14 p. - Published in : Phys. Rev. D 92 (2015) 045027 External link: Preprint

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2015-08-27
07:56
Oscillons and oscillating kinks in the Abelian-Higgs model / Tsagkarakis, C E ; Achilleos, V ; Diakonos, F K ; Frantzeskakis, D J ; Katsimiga, G C ; Maintas, X N ; Manousakis, E ; Tsapalis, A
We study the classical dynamics of the Abelian Higgs model employing an asymptotic multiscale expansion method, which uses the ratio of the Higgs to the gauge field amplitudes as a small parameter. We derive an effective nonlinear Schr\"{o}dinger equation for the gauge field, and a linear equation for the scalar field containing the gauge field as a nonlinear source. [...]
arXiv:1508.06209.- 2015 - Published in : PoS CORFU: 2014 (2015) , pp. 122 External link: Preprint

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