822 research outputs found

    A visual inspection system with flexible illumination and auto-focusing

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    Copyright 2002 Society of Photo-Optical Instrumentation Engineers

    Semifree Hamiltonian circle actions on 6-dimensional symplectic manifolds with non-isolated fixed point set

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    Let (M; ω) be a 6-dimensional closed symplectic manifold with a symplectic S1-action with MS1 ≠0 ; and dim MS1 ≤ 2. Assume that ω is integral with a generalized moment map μ. We first prove that the action is Hamiltonian if and only if b+ 2 (Mred) = 1, where Mred is any reduced space with respect to μ. It means that if the action is non-Hamiltonian, then b+ 2 (Mred) ≥ 2. Secondly, we focus on the case when the action is semifree and Hamiltonian. We prove that if MS1 consists of surfaces, then the number k of fixed surfaces with positive genera is at most four. In particular, if the extremal fixed surfaces are spheres, then k is at most one. Finally, we prove that k ≠ 2 and we construct some examples of 6-dimensional semifree Hamiltonian S1-manifolds such that MS1 contains k surfaces of positive genera for k = 0 and 4. Examples with k = 1 and 3 were given in [L2]. © 2015, International Press of Boston, Inc. All rights reserved1111sciescopu

    Construction of Hong-dae cultural district : cultural place, cultural policy and cultural politics

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    Cho M. Construction of Hong-dae cultural district : cultural place, cultural policy and cultural politics. Bielefeld (Germany): Bielefeld University; 2007.This dissertation examines how the process of creating the "Hong-dae cultural district" in Seoul has involved the mobilisation of various social groups and triggered the (re)institutionalisation of the meaning of "the cultural". It seeks to explicate how a cultural policy project can stimulate the emergence of social groups, which challenge existing policy provisions and laws and lead to the (re)institutionalisation of "Hong-dae culture". In so doing, the author will be able to simultaneously take account of the issues of agency, structure and culture by explicating the relationship between cultural policy and social change

    Water transport in paint films

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    Applied Science
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