Results 1 - 10 of 22034
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[en] An apparatus is described for monitoring the permeability of the cladding of a nuclear reactor control rod. This apparatus has a first and second primary winding electrically interconnected; a secondary winding between the primary windings; a system to supply an A.C. voltage to these windings; a device for measuring the output voltage of the secondary winding
[fr]On decrit un appareil pour controler la permeabilite relative de l'enveloppe d'une barre de commande d'un reacteur nucleaire, appareil qui comprend un premier et un second enroulement primaire interconnecte electriquement; un enroulement secondaire dispose entre les enroulements primaires; un dispositif pour fournir une tension electrique alternative a ces deux enroulements; un dispositif pour mesurer la tension de sortie de l'enroulement secondaire
[en] A description of the measurement procedure, related theory and experimental data analysis of the magnetic susceptibility of materials is given. A short review of previous papers in the line of this subject is presented. This work covers the whole experimental process, in detail, and presents a pragmatic approach for pedagogical sake
[en] Within the scope of the approximation of a kinematic field I have been calculating the uniform paramagnetic susceptibility χ(0,0)=δR(H)/δH when H → 0 and U → ∞. It turns out that χ(0,0) < 0 in the all region, where R=0 (i.e. 0,7 > or approx. n ≥ 0). (author). 6 refs, 1 fig
[en] The magnetic susceptibility of a BCS superconductor with partially depaired states (Fulde state) is investigated as a possible explanation of deviations from the Chandrasekar-Clogston limit
[en] The temperature-dependence of the magnetic susceptibility of CsV1-xMgxCl3 (x=0.000-0.357) is investigated to elucidate finite-size effects in the S=3/2 one-dimensional Heisenberg antiferromagnet. The experimental results are compared with the results of the exact-diagonalization method for chains with up to seven-spins. (author)
[en] An interesting memory effect occurs when La1-xSrxMnO3 (x∼1/8) is repeatedly exposed to x rays. While the ''dark'' conductivity remains unaffected by the irradiation history, the conductivity is markedly enhanced upon exposure to x rays at low temperatures. Immediately after renewed exposure, it recovers the value attained at the end of the previous exposure. We provide a qualitative explanation of this unusual effect in terms of three distinct states with different orbital correlations
[en] Complete text of publication follows. The study at room temperature of the anisotropy of magnetic susceptibility (RT-AMS) has been used traditionally as a powerful technique in structural analyses, since a direct relationship between magnetic fabric and strain ellipsoid was found (Hrouda, 1982, Borradaile, 1988). However, the superposition of different tectonic events and complex magnetic mineralogy hamper the interpretation of the magnetic fabric regarding the structural setting. In the Aptian-Albian black marls and limestones of the North-pyrenean basin, a RT-AMS study was carried out in 40 sites in order to control the strain ellipsoid. Due to the lack of structural markers analysis of deformation was not possible. The Aptian-Albian sedimentation, reaching thickness of about 1.5 km in the basin depocenters in this area, is linked to the strike-slip or transtensional movement of WNW-ESE faults. The compressional deformation (Late Cretaceous-Eocene in age) resulted in folds and development of a pervasive foliation in pelitic sediments during the inversion of the basin. The studied sites show: (i) subparallel bedding and foliation planes (19 sites), (ii) very different attitudes of bedding and foliation planes and bedding close to horizontal (9 sites), (iii) bedding and no foliation (6 sites) and (iv) in the rest only the foliation plane was determined. In spite of showing a similar magnetic mineralogy, the behavior of the magnetic ellipsoid is not homogeneous throughout the studied area. Thermomagnetic curves in argon atmosphere of selected samples indicate the same predominance of paramagnetic minerals (hyperbolic shape at lower temperatures) and the formation of magnetite with heating. The orientation of the magnetic ellipsoid in sites showing high angles between bedding and foliation planes show a grouping of the K3 axes near the pole to foliation. The sites where either bedding or foliation planes are observed separately have different orientations of the magnetic ellipsoid, with only one site in each group showing K3 axes clustered near the pole of the plane. Conversely, the sites where foliation and bedding are subparallel might have preserved and reinforced the orientation of the K1 axes at the time of the transtensional deformation during Aptian-Albian times. The AMS measured in samples cooled down to 77 K (LT-AMS) help to better control the paramagnetic fabric. In the studied samples overlap of RT-AMS with LT-AMS, confirms that the paramagnetic minerals dominate the RT-AMS. Therefore, RT-AMS can be successfully applied as an indicator of the petrofabric of phyllosilicates.
[en] Highlights: • Influences of defects are sensitive to the defect location. • Defects may usually lead the main resonance peak to shift to a lower frequency. • Defects are promising for tailoring dynamic properties of submicron ferromagnetic particle. - Abstract: Based on micromagnetic simulations, we shall demonstrate that influences of hole- or pit-shaped artificial defects on magnetic properties of rectangular submicron ferromagnetic particle are sensitive to the defect location, and dependent in a somewhat complicated way on size and shape of the defects. Generally, these defects may lead the main resonance peak of magnetic susceptibility spectrum to shift to a lower frequency. Our work may provide an effective way to tailor and design static and dynamic properties of submicron ferromagnetic particle by patterning artificial defects.