摘要:

The behavior of superconducting NbTi wires under dynamic mechanical stress was investigated. Instabilities on the stress‐strain curve (serrated yielding) were found connected with local transition into the normal state. With applied field and transport current, NbTi conductors with and without copper matrix showed a training behavior. This means that the normal transitions occurred at successively higher stress levels. Mechanisms proposed so far, such as serrated yielding of NbTi or deformation of the copper matrix in compound conductors, do not seem to explain the training of superconducting magnets.

ISSN:0003-6951    

DOI:10.1063/1.88800

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

Contrast from domain walls in materials with cubic magnetic anisotropy has been observed in scanning electron microscope (SEM) images. This contrast, which is visible in both the backscattered and absorbed current images, with normal electron beam incidence arises from the interaction of the convergent incident electron beam with the domains on either side of the wall.

ISSN:0003-6951    

DOI:10.1063/1.88801

出版商:AIP    

年代:1976

数据来源: AIP

摘要:

A simple model of the interaction between the optical and thermal properties of the sample is shown to predict signal saturation in photoacoustic spectroscopy in excellent agreement with measurements on a methylene blue dye solution. The measured onset of signal saturation as a function of the absorption is accurately predicted by the model from the sample’s thermal properties. The effect of light reflection by the sample on the photoacoustic signal is discussed.

ISSN:0003-6951    

DOI:10.1063/1.88807

出版商:AIP    

年代:1976

数据来源: AIP