The effect of magnetic shaking on nonoriented silicon steel rings
The effect of magnetic shaking on the incremental permeability of nonoriented silicon steel rings was studied. 50H470 silicon steel is a very popular and cheap material, but does not have a high incremental permeability. However, we achieved a value of 27 000 for the target field of 10 Hz, 0.05 A/m, which is comparable to commercial PC permalloy. We also measured the target field, which ranged from 0.05-5 A/m, 1 Hz-1 kHz. Magnetic shaking was effective at 60 Hz is effective at shaking field amplitudes 40-60 A/m, corresponding to a flux density of 0.2-0.6 B/sub s/. We also made ring samples from 50H470 steel plates produced by a nibbling machine and evaluated the effect of stress on their magnetic properties.
Improved Magnetic Shielding Using an Fe-Amorphous Si-Steel Composite Panel.
An improved magnetic shielding method using the magnetic shaking technique with a planar mesh coil was used to develop a composite shielding panel consisting of Fe-based amorphous sheets and Si-steel sheets. The mesh coil, sandwiched by the two ferromagnetic materials, creates a two-dimensional shaking field that enhances magnetic shielding. The composite panel, annealed without the application of a field, shows an exceedingly high shielding effectiveness of 470. The fine and circular magnetic domains of Fe-amorphous ribbons annealed without the application of a field contribute to the magnetic shielding effectiveness of alternating fields at high frequencies.
Chromatographic analysis of elastomer antidegradants and accelerators
Summary The use of various chromatographic methods in the analysis of all classes of elastomer antidegradants and accelerators is reviewed. The review of extraction methods is also included.