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  • 1990-1994  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    From rigid rod to random walk. Some exact results (1993)
    Springer
    Polymer bulletin 30 (1993), S. 617-620 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The conformational behaviour of a macromolecule is described by a random walk of fixed contour length which consists of n straight segments, where n=1,2, .... Two cases are discussed: (i) the segments are of equal length; (ii) the points where the random walk changes its direction are randomly distributed along the contour. Analytical expressions for the mean squared end-to-end distance R and for the radius of gyration R g are presented. When deriving R g it is assumed that the mass of the chain is distributed uniformly along the contour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296483
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Projections of generic surfaces of revolution (1993)
    Springer
    Geometriae dedicata 48 (1993), S. 211-230 
    Details
    ISSN: 1572-9168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We study some geometric properties of a generic surface of revolution in ℝ3, like its order of contact with lines and its projection onto planes. The projections of generic surfaces of revolution from any centre of projection are classified up to diffeomorphisms of the apparent contour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01264068
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spinal cord sarcoidosis (1994)
    Springer
    Neuroradiology 36 (1994), S. 627-628 
    Details
    ISSN: 1432-1920
    Keywords: Sarcoidosis ; Spinal cord tumours ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We present a case of spinal cord sarcoidosis which resembled a disseminated intramedullary tumour. The case is unusual because the spinal cord is only rarely affected by sarcoidosis and the patient developed a neurological deficit as the first manifestation of the disease. This condition thus has to be considered in the differential diagnosis of primary intramedullary tumours, or metastatic disease with involvement of the spinal cord.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00600426
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Generic properties of edges and “corners” on smooth greyvalue surfaces (1992)
    Springer
    Biological cybernetics 66 (1992), S. 497-502 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The edge line on a smooth greyvalue surface, defined as locus of maximal slope, is a curve embedded in the negatively curved part of the greyvalue surface. For an open and dense set of greyvalue functions the edge line has transverse double points as its only singular points, meets the parabolic curve tangentially at isolated points, and intersects the zero crossings of the Laplacean of the greyvalue function transversely. Defining a greyvalue corner as a curvature extremum of the edge line one can show that, again for an open and dense set of greyvalue functions, these corners are isolated points in the image corresponding to ordinary curvature extrema of the edge. Detecting such corners in greyvalue images requires differential operators containing partial derivatives of order five, which raises some doubts about the existence of numerically robust algorithms for detecting these features in digital images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204114
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Global bifurcation sets and stable projections of nonsingular algebraic surfaces (1992)
    Springer
    International journal of computer vision 7 (1992), S. 171-194 
    Details
    ISSN: 1573-1405
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The view graph of a surface is a planar graph whose nodes are the stable views (projections) of the surface and whose edges represent transitional views of codimension one. The space of all directions of orthogonal projection can be identified with the projective plane. The set of “bad” projection directions, associated with the degenerate views of positive codimension, forms a graph in the projective plane (the view bifurcation set). This graph is dual to the view graph and divides the projective plane into a certain number of connected regions whose representatives are the nodes of the view graph. We assume that the projected surface is nonsingular and parameterized by polynomials of degree d. We present an estimate for the number of nodes in the view graph in terms of d and describe symbolic algorithms for computing the bifurcation set and the view graph of a surface from a parametrization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00126392
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    Paper (German National Licenses)
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