WPI-AIMR - Wpi Research Center
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Description
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WPI-AIMR has adopted a unique method of appointing the world's leading researchers as research leaders, or what we term Principal Investigators (PI). Currently we have 31 PIs. Although most of them belong exclusively to WPI-AIMR, 14 of them are located at research centers outside Japan. PIs hold significant power over their own research and are allowed to make proposals to the Center Director on hiring new researchers as may be necessary to their research. Taking into consideration the research strategy, the Center Director decides whether or not to approve these proposals.
The Administration Department constitutes an important part of the Institute. To accomplish the Institute's goals, it is crucial to provide researchers with the best research environment possible. The Administration Department is in charge of these tasks, enabling the Center Director to supervise the whole Institute and allowing the PIs and researchers to concentrate on their research. |
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Profil scientifique partiel |
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Domaines étudiés partiels
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Quelques documents de Wpi Research Center
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Propagation of shear bands in metallic glasses and transition from serrated to non-serrated plastic flow at low temperatures
Auteurs :
A. Inoue, A. Lazarev, S. Li, D.V. Louzguine-Luzgin, A. Vinogradov, A.R. Yavari et Y. Yokoyama
Masquer le résumé
The mechanical behavior and the kinetics of shear banding in bulk metallic glasses was investigated at room and liquid nitrogen temperature using the acoustic emission (AE) technique. It was demonstrated that the intensive AE reflecting the activity of strongly localized shear bands at room temperature vanishes at the transition of plastic flow from serrated to non-serrated with a reduction in temperature. The disappearance of AE clearly suggests that the shear band propagation velocity significantly decreases at low temperature, and sliding along the principle shear band is observed at the machine-driven rate.
Cu-based metallic glass particle additions to significantly improve overall compressive properties of an Al alloy
Auteurs :
M. Aljerf, Muriel Braccini, D.V. Dudina, K. Georgarakis, A. Inoue, Y. Li et A.R. Yavari
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We report the development of a novel light-weight Al (520) alloy-based composite reinforced with particles of a Cu-based (Cu54Zr36Ti10) metallic glass by mechanical milling followed by induction heated sintering. The consolidation of the composite is performed at a temperature in the super-cooled liquid region of the metallic glass just above its glass-transition temperature (T-g). Metallic glasses are a promising alternative reinforcement material for metal-matrix composites capable of producing significant strengthening along with a friendly sintering behavior. The mechanical milling procedures were properly established to allow reduction of the size of the metallic glass particles and their uniform distribution in the matrix. Microstructural observation of the composite did not reveal any porosity. The interface between the glassy particles and the matrix remained free of such defects. The fully dense consolidated composite showed a drastic gain in specific yield strength under compression relative to the matrix alloy and appreciable plasticity at fracture.
High-pressure Raman spectroscopy of carbon onions and nanocapsules
Auteurs :
M.W. Chen, T. Fujita, J.J. Guo, G.H. Liu, X.M. Wang, B.S. Xu et 武志 藤田
Pas de résumé disponible
Source :
Tohoku University
Three-dimensional morphology of nanoporous gold
Auteurs :
M.W. Chen, Jonah Erlebacher, T. Fujita, Koji Inoke et Li-Hua Qian
Pas de résumé disponible
Source :
Tohoku University
Optical Near-Field Probe Integrated With Self-Aligned Bow-Tie Antenna and Electrostatic Actuator for Local Field Enhancement
Magnetic excitations and phonons in the spin-chain compound NaCu 2 O 2
Auteurs :
L. Capogna, K.Y. Choi, V.P. Gnezdilov, Martin Jansen, M.R. Johnson, B. Keimer, P. Lemmens, A. Maljuk et M. Sofin
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We report an inelastic light scattering study of single-crystalline
NaCu2O2, a spin-chain compound known to exhibit a phase with helical
magnetic order at low temperatures. Phonon excitations were studied as
a function of temperature and light polarization, and the phonon
frequencies are compared to the results of ab initio lattice dynamical
calculations, which are also reported here. The good agreement between
the observed and calculated modes allows an assignment of the phonon
eigenvectors. Two distinct high-energy two-magnon features as well as a
sharp low-energy one-magnon peak were also observed. These features are
discussed in terms of the magnon modes expected in a helically ordered
state. At high temperatures, the spectral features attributable to
magnetic excitations are replaced by a broad, quasielastic mode due to
overdamped spin excitations.
Nonuniform silicon oxidation and application for the fabrication of aperture for near-field scanning optical microscopy
Auteurs :
Masayoshi Esashi, Phan N. Minh et T. Ono
Pas de résumé disponible
Source :
Tohoku University
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