Aoyama Gakuin University

About: Aoyama Gakuin University is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Superconductivity & Thin film. The organization has 3494 authors who have published 6419 publications receiving 115648 citations. The organization is also known as: Aoyama gakuin daigaku.

Unconventional One-Magnon Scattering Resistivity in Half-Metals

Abstract: Low-temperature resistivity of half-metals is investigated. To date it has been discussed that the one-magnon scattering process in half-metals is irrelevant for low-temperature resistivity, due to the fully spin-polarized electronic structure at the ground state. If one takes into account the non-rigid-band behavior of the minority band due to spin fluctuations at finite temperatures, however, the unconventional one-magnon scattering process is shown to be most relevant and gives T 3 dependence in resistivity. This behavior may be used as a crucial test in the search for half-metallic materials which are potentially important for applications. Comparison with resistivity data of La 1- x Sr x MnO 3 as candidates for half-metals shows good agreement.

The Development of Task-Based Assessment in English for Academic Purposes Programs.

Abstract: Proposals for task-based approaches to syllabus design (Prabhu 1987; Nunan 1989; Long and Crookes 1992) have had little to say about the role of testing and evaluation procedures. This paper suggests a role for 'authentic measurement' using performance measures in task-based approaches to assessment. In particular, we describe the implementation of a task-based, performance-referenced test of English for academic purposes, developed for use in placing ESL students into an academic reading program at a university English language institute. Results of the present study, based on contrastive discriminant analyses of systemic and mixed systemic/procedural placement batteries with an academic research task performance as the criterion variable, suggest that traditional skills-focused tests of EAP ability relate only weakly to learners' ability to act on such skills in authentic task conditions. Indirect performance-referenced tests, when used in combination with system-referenced tests, are much clearer predictors of success in performing academic task simulations. The relationship of performance-referenced testing to issues in placement and academic English course design are discussed in light of the present study

Non-contact estimation of thickness and elastic properties of metallic foils by laser-generated Lamb waves

Abstract: Non-contact estimation of the thickness and elastic properties of metallic foils was attempted by quantitative analysis of velocity dispersion of laser-generated Lamb waves. Lamb waves were generated in stainless steel (AISI304) foils with a thickness of less than 40 μm by a Q-switched Nd:YAG laser. Both the zeroth order symmetric S0 and anti-symmetric A0 waves were monitored using a heterodyne-type laser interferometer. Dispersion of group velocity of the A0 mode was obtained by the wavelet transformation, and was found to agree well with the numerical solution of the Rayleigh–Lamb equation. A modified method to estimate both the thickness and acoustic (or elastic) properties from the sheet wave velocity and the group velocity dispersion of the A0 mode was proposed. The modified method was found to provide a correct estimate for stainless steel foils thinner than 30 μm.