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  • Articles: DFG German National Licenses  (2)
  • Chemistry  (1)
  • De-noising  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 38 (2000), S. 2-8 
    ISSN: 1741-0444
    Keywords: De-noising ; Time-frequency distributions ; Matching pursuit ; Knee-joint sounds ; Vibro-arthrography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A novel de-noising method for improving the signal-to-noise ratio of knee-joint vibration signals (also known as vibro-arthrographic (VAG) signals) is proposed. The de-noising methods considered are based on signal decomposition techniques, such as wavelets, wavelet packets and the matching pursuit (MP) method. Performance evaluation with synthetic signals simulated with the characteristics expected of VAG signals indicates good de-noising results with the MP method. Statistical pattern classification of non-stationary signal features extracted from time-frequency distributions of 37 (19 normal and 18 abnormal) MP method-de-noised VAG signals shows a sensitivity of 83.3%, a specificity of 84.2% and an overall accuracy of 83.8%.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 6 (1981), S. 170-172 
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In an experimental setup two transparent condensed explosives of different detonation velocities are coaxially arranged to give Mach reflection in the low speed explosive (overdriven detonation). Due to the transparent characteristic of the explosive, this setup, with a suitable streak camera, is shown to give the facility of continuously recording the phenomenon of Mach reflection before as well as after its formation. The important characteristics of Mach reflection, viz., triple point growth angle, Mach-disc configuration and its dimension, and propagation velocity can now be accurately and continuously measured; also the information on the transients before the formation of Mach reflection is made available. The possibility of generating these data continuously with the improved accuracy will help in better understanding of Mach-reflection phenomenon.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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