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  • 1
    Electronic Resource
    Electronic Resource
    Application of uniform cubic B-spline curves to machine-tool control (1991)
    Springer
    Journal of intelligent and robotic systems 4 (1991), S. 393-402 
    Details
    ISSN: 1573-0409
    Keywords: Machine tool ; numerical control ; interpolation ; B-spline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The application of B-spline functions in the domain of machine-tool control can be efficient only if it is possible to simultaneously control the shape of a contour and the speed along this contour. The paper describes a method allowing us to control the speed of a tool moving along a contour defined by an uniform cubic B-spline. This method is based upon the discretization of the B-spline parameter with respect to both a given geometrical error at to the desired speed law.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314942
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Osteoid osteoma and osteoblastoma: MRI appearances and the significance of ring enhancement (1996)
    Springer
    European radiology 6 (1996), S. 291-296 
    Details
    ISSN: 1432-1084
    Keywords: Magnetic resonance imaging ; Osteoid osteoma ; Osteoblastoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We assessed the value of contrast-enhanced fat-suppressed MRI on nine patients with osteoid osteomas and osteoblastomas. The results were compared with plain films, bone scintigraphy, computed tomography (CT) and pathological specimens. On contrast-enhanced fat-suppressed T1-weighted images the non-calcified nidi showed homogeneous enhancement, whereas the calcified lesions showed a ring enhancement sign that was proportional in intensity to the extent of the remaining part of the vascularized nidus. The degree of bone marrow and soft tissue enhancement was relative to the size and reactive inflammatory changes of the lesions. Although CT was diagnostic in most of the cases and more specific to show the calcified lesions, MRI was confirmatory in one case. We concluded that, although CT is the primary diagnostic investigation in osteoid osteomas, MRI can be reserved for equivocal cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180597
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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