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  • Computer tomography  (2)
  • DSC  (2)
  • Ballistic movement  (1)
  • Springer  (5)
  • 1
    ISSN: 1572-8943
    Keywords: cold crystallization ; DSC ; heat capacity ; modulated temperature DSC ; poly(ethylene terephtalate)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The modulated temperature differential scanning calorimetric method (MT-DSC) yields three temperature dependent signals, an underlying heat capacity curve from the underlying heat flow rate (corresponding to the conventional DSC signal), and a complex heat capacity curve with a real part (storage heat capacity) and an imaginary part (loss heat capacity). These curves have been measured in the cold crystallization region for poly(ethylene terephtalate) with a modified Perkin-Elmer DSC-7. The underlying curve shows the well known large exothermic crystallization peak. The storage heat capacity shows a step change which reproduces the change in heat capacity during crystallization. This curve may be used as baseline, to separate the crystallization heat flow rate from the underlying heat flow rate curve. The loss heat capacity curve exhibits a small exothermic peak at the temperature of the step change of the storage curve. It could be caused by changes of the molecular mobility during crystallization.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-8943
    Keywords: calibration material ; calibration procedure ; DSC ; heat calibration ; heat flow rate calibration ; standards ; temperature calibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Metrologically based measuring procedures and evaluation methods are recommended as guidance for practical temperature, heat and heat flow rate calibration of DSC instruments which are largely independent of instrumental, test and sample parameters. The relevant terms are defined, the measuring procedures and evaluation methods described, calibration materials and their characteristic data stated and guidance for the sample handling provided. Reference is made to three extended papers on calibration. The recommendations were developed by the working group ‘Calibration of Scanning Calorimeters’ of the German Society of Thermal Analysis (GEFTA).
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Informatik-Spektrum 10 (1987), S. 192-204 
    ISSN: 1432-122X
    Keywords: Digitale Bildverarbeitung ; Computer-Graphik ; dreidimensionale Darstellung ; medizinische Diagnostik ; Computertomographie ; Kernspintomographie ; Digital image processing ; Computer graphics ; Three-dimensional display ; Medical diagnostics ; Computer tomography ; Magnetic resonance tomography ; I.4 ; J.3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Summary The classical imaging modalities in medicine deliver only two-dimensional views of a three-dimensional reality. Using techniques of image processing and computer graphics, it is possible to reconstruct medical objects from spatial image sequences and to show arbitrary views on a display screen. For this purpose the volume of primary data has to be segmented into the objects and a data structure suitable for the display operation has to be generated. The methods are described and illustrated with applications in diagnostic radiology, surgery, orthopedics, and anatomy. Finally the problems of implemention for routine application are discussed.
    Notes: Zusammenfassung Die klassischen medizinischen Abbildungsverfahren liefern nur zweidimensionale Ausschnitte aus einer dreidimensionalen Wirklichkeit. Mit Hilfe der digitalen Bildverarbeitung und der Computer-Graphik ist es jedoch möglich, medizinische Objekte aus räumlichen Bildfolgen zu rekonstruieren und wählbare Ansichten auf einem Bildschirm darzustellen. Zu diesem Zweck muß das Datenvolumen in die darzustellenden Objekte segmentiert und in eine für die Darstellung geeignete Datenstruktur übergeführt werden. Die Verfahren hierfür werden erläutert und mit Anwendungen aus der radiologischen Diagnostik, der Chirurgie, der Orthopädie und der Anatomie illustriert. Schließlich werden die Probleme der Implmentation für Routinezwecke diskutiert.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2315
    Keywords: Computer tomography ; Magnetic resonance imaging ; Ray-casting algorithm ; Voxel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Multi-slice images obtained from computer tomography and magnetic resonance imaging represent a 3D image volume. For its visualization we use a raycasting algorithm working on a gray-scale voxel data model. This model is extended by additional attributes such as membership to an organ or a second imaging modality (“generalized voxel model”). It is shown that the combination of different surface-rendering algorithms together with cutting and transparent display allow a realistic visualization of the human anatomy.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1106
    Keywords: Ballistic movement ; Three-burst pattern
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In isotonic and isometric goal-directed index finger movements made as fast as possible, the “braking hypothesis” ascribed to the antagonist burst was tested. Under isotonic conditions, the extensor burst often failed to occur in small angle movements with low inertial load. It regularly occurred, however, in small angle movements with high inertial load and in wide angle movements with both low and high inertial loads. Such features suggest, indeed, the antagonist burst as being part of braking strategies. Under isometric conditions, the antagonist burst — if it occurred — exhibited characteristics which suggested a rapidly alternating movement rather than a braking strategy.
    Type of Medium: Electronic Resource
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