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  • 1
    Digitale Medien
    Digitale Medien
    Voltammetric determination of platinum from aqueous solutions and from urine (1986)
    s.l. : American Chemical Society
    Analytical chemistry 58 (1986), S. 1956-1959 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00122a009
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  • 2
    Digitale Medien
    Digitale Medien
    Flux density dependence of magneto-acoustic emission in pipeline steel (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 601-606 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magneto-acoustic emission (MAE) in pipeline steel was investigated to study its dependence on the amplitude of the excitation flux density, ||B||, in the sample. At low magnetizations, the MAE rms voltage exhibited a nearly linear dependence on ||B|| in the sample, while at higher magnetizations it tended to saturate. The ||B|| dependence of MAE activity was analyzed in terms of the pulse-height distribution of the MAE wave forms. It was observed that at low ||B||, the MAE activity is due to domain wall motion while at high ||B|| the genesis seems to be also from rotation of the domain magnetization vectors. The importance of analyzing MAE activity in terms of the pulse-height distribution of the MAE wave forms is emphasized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351839
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  • 3
    Digitale Medien
    Digitale Medien
    Magnetic easy axis development in steel—the influence of manufacturing (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2163-2165 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Oil and gas pipelines often display a bulk magnetic easy magnetization direction, and this may influence results obtained during magnetic nondestructive evaluation. The origin of this magnetic easy axis is not well known. Earlier work [L. Clapham, C. Heald, T. Krause, and D. L. Atherton, J. Appl. Phys. 86, 1574 (1999)] speculated that it was a result of residual stresses introduced during pipeline manufacturing, specifically cold bending. This article reports a study in which a magnetic Barkhausen noise technique is used to follow the development of a magnetic easy axis in a steel plate sample subjected to progressive amounts of cold bending. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1305900
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  • 4
    Digitale Medien
    Digitale Medien
    Origin of a magnetic easy axis in pipeline steel (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 1574-1580 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Oil and gas pipelines are generally magnetically anisotropic, with a magnetic easy axis in the pipe axial direction. This is of interest because magnetic flux leakage tools are commonly used for the detection and sizing of defects. In the present study we investigate the origin of this magnetic easy axis, using an angular magnetic Barkhausen noise technique to characterize the magnetic anisotropy. The texture, microstructure, and residual stress are examined as possible causes of the easy axis, using x-ray pole figure analysis and microstructural examination along with high and low temperature annealing treatments. Our results indicate that plastic deformation and residual stress are responsible for the magnetic easy axis, since an elimination of the residual stresses through low temperature "stress relief" heat treatment produces a magnetically isotropic structure without altering the texture or microstructure. X-ray pole figure analysis supports the conclusion that magnetic anisotropy is not related to texture in these materials. We conclude that the axial magnetic easy axis is due to a compressive residual hoop stress resulting from the cold bending and cold expansion of the pipe during processing. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.370930
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  • 5
    Digitale Medien
    Digitale Medien
    Infantile acquired zinc deficiency resembling acrodermatitis enteropathica (2005)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 30 (2005), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2230.2005.01833.x
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  • 6
    Digitale Medien
    Digitale Medien
    Follow-up of adult patients with atopic eczema treated with Chinese herbal therapy for 1 year (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 20 (1995), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Adult patients with severe atopic eczema who had completed a double-blind placebo-controlled crossover trial of a specific formulation of Chinese herbal therapy were offered continued therapy for 1 year. Of 31 patients who completed the original placebo-controlled study and after a washout period and 2 months of further treatment, 17 continued treatment (group 1), 11 chose not to continue treatment (group 2), one was lost to follow-up and two patients originally in group 1 decided to stop treatment and became pregnant. At the end of the year, 12 of the patients in group 1 had greater than 90% reduction and the remaining five had greater than 60% reduction in clinical scores compared with baseline values. Clinical scores of patients in group 2 gradually deteriorated so that by the end of the year the difference between groups 1 and 2 was highly significant (P=0·005 and P=0·002 for erythema and surface damage, respectively).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2230.1995.tb02717.x
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  • 7
    Digitale Medien
    Digitale Medien
    Juvenile elastoma and osteopoikilosis (the Buschke-Ollendorf syndrome) (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 7 (1982), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2230.1982.tb02393.x
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  • 8
    Digitale Medien
    Digitale Medien
    Detection of stress concentrations around a defect by magnetic Barkhausen noise measurements (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6391-6395 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The stress distribution around a 50% blind-hole pit in a steel pipe with a 9 mm wall has been studied using high-resolution magnetic Barkhausen noise (MBN) measurements. A magnetic disk read-head is used as the pick up coil in the MBN probe. The study shows a stress concentration factor of ∼2 at the defect edge perpendicular to the direction of applied stress and ∼−0.6 at the edge parallel to the same. The experimental results are consistent with the analytical solutions obtained by the Airy's stress function approach. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363657
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  • 9
    Digitale Medien
    Digitale Medien
    Correlation between the Barkhausen noise power and the total power losses in 3% Si–Fe : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6042-6044 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We present results on Barkhausen noise power in grain oriented 3% Si–Fe samples of different quality (power losses). Barkhausen noise is measured at constant values of the magnetic field applied in the rolling direction of the sheet. The measurements indicate a strong correlation between the Barkhausen noise power and total power losses. A model is proposed to interpret the results according to which the Barkhausen noise power is related to the density of pinning centers per unit coercive field, an intrinsic parameter of the material. It is shown that this parameter characterizes the ability of the external field to increase the number of moving walls. The model and the experiment demonstrate that the power losses in grain oriented 3% Si–Fe are improved either by dynamic homogenization of magnetization, or by decreasing the domain wall spacing in static conditions. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362084
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  • 10
    Digitale Medien
    Digitale Medien
    Reversible and irreversible components of tensor magnetization and magnetostriction : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 7106-7108 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Tensor magnetostriction and magnetization hysteresis loops for a 25 mm ferrite magnet cube were measured. These describe the magnetization properties and reflect the anisotropy of the system. The sample investigated allowed the magnetization to be interpreted in terms of a magnetization vector rotation process and described by the Stoner–Wohlfarth model. The reversible and irreversible components were extracted for both the magnetostriction and magnetization tensors. Up to now, very few direct measurements of these reversible changes in strain have been reported. The different magnitudes of reversible magnetization and magnetostriction are analyzed and explained qualitatively by a representation involving both magnetization and magnetostriction processes. The magnetostrictive effect is taken into account quite simply by considering a demagnetized sphere distorted into an ellipsoid of revolution when saturated. The ellipsoid will rotate as the magnetization vector according to the Stoner–Wohlfarth model. Two cases are illustrated depending on the easy axes location. These explain the experimental results obtained with the ferrite sample. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.367533
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