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  • 1
    Electronic Resource
    Electronic Resource
    Assessing the impact of essential tremor on upper limb function (1993)
    Springer
    Journal of neurology 241 (1993), S. 54-61 
    Details
    ISSN: 1432-1459
    Keywords: Hereditary essential tremor ; Accelerometry ; Functional measures ; Suppressability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We compared the impact of essential tremor on the performance of three manual tasks: drawing spirals, holding a cup full of water and a joystick-controlled tracking test. Tremor amplitude and frequency were measured by accelerometry during the tracking test, when holding the cup and whilst a standard posture was maintained. The inter-relationships between tremor amplitude, frequency and task impairment were then examined. The results showed that the amplitude and frequency of essential tremor (measured from the principal spectral peak) changed with different activities, with the mildest postural tremors changing most in frequency (by up to 4–5 Hz). The amplitude of tremor decreased in almost every case during the tasks, relative to posture, and this decrement was greatest for the most severe tremors. We also demonstrate that for practical purposes, such as routine clinical situations and therapeutic trials, the effect of essential tremor upon upper limb function can be usefully assessed by two simple complementary techniques: rating spirals and measuring the volume of water split from a cup. The impairments in carrying out these tasks and the tracking test were highly correlated with one another and also with the amplitude and frequency of postural tremor. The concept of tremor “suppressability” is introduced: the relative percentage decrease in the amplitude of a particular tremor during the performance of a specific task compared to that recorded whilst holding a standard posture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00870673
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  • 2
    Electronic Resource
    Electronic Resource
    Electric field-induced dipole reorientation in oriented nylon 11 by in situ infrared spectroscopy (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 781-788 
    Details
    ISSN: 0887-6266
    Keywords: nylon ; infrared spectroscopy ; electric field poling ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dipole reorientation under the influence of an electric field is investigated in oriented nylon 11 films with polarized infrared spectroscopy for the amide A and amide I bands. Butterfly-shaped hysteresis loops are obtained from peak intensity versus applied electric field strength. Least-squares Gaussian curve fitting of the resolved multiple contributions to the amide I peak show that the components change in either a continuously reducing S-shaped fashion, or in butterfly-shaped curves under ac poling fields. Time-dependent studies of the absorption intensities show that both ordered and disordered species switch towards the electric field direction with the application of electric fields higher than the coercive field. Upon field removal, only the disordered species show orientation relaxation away from the field direction. Below the coercive field, neither species responds orientationally to the field. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Fermi resonance in the infrared spectra of Nylon-11 (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 1073-1080 
    Details
    ISSN: 0887-6266
    Keywords: Nylon-11 ; infrared spectroscopy ; Fermi resonance ; crystal structures ; symmetry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Nylon-11 is prepared by casting from the solvents trifluoroacetic acid and m-cresol and by melt-crystallization. Room-temperature infrared spectra are compared in terms of possible crystal structures. The spectra are examined for the presence of Fermi resonance which occurs between the N-H stretching fundamental mode and the overtone and combination modes of the amide I and II vibrations. An analysis of peak frequencies and intensities is used to provide support for the assignment of the amide II overtone and the amide I + II combination modes. A newly observed peak in the spectra is assigned to the amide I overtone. Symmetry considerations are discussed which predict the resonance of the overtone and combination modes with the N-H stretching fundamental. © 1992 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090301001
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    Paper (German National Licenses)
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