913 research outputs found
Independent lung ventilation using a double-lumen endobronchial tube by nasotracheal intubation
Strong suppression of superconductivity by divalent Ytterbium Kondo-holes in CeCoIn_5
To study the nature of partially substituted Yb-ions in a Ce-based Kondo
lattice, we fabricated high quality Ce_{1-x}Yb_xCoIn_5 epitaxial thin films
using molecular beam epitaxy. We find that the Yb-substitution leads to a
linear decrease of the unit cell volume, indicating that Yb-ions are divalent
forming Kondo-holes in Ce_{1-x}Yb_xCoIn_5, and leads to a strong suppression of
the superconductivity and Kondo coherence. These results, combined with the
measurements of Hall effect, indicate that Yb-ions act as nonmagnetic impurity
scatters in the coherent Kondo lattice without serious suppression of the
antiferromagnetic fluctuations. These are in stark contrast to previous studies
performed using bulk single crystals, which claim the importance of valence
fluctuations of Yb-ions. The present work also highlights the suitability of
epitaxial films in the study of the impurity effect on the Kondo lattice.Comment: 5 pages, 4 figure
Macroscopic Electromagnetic Response of Arbitrarily Shaped Spatially Dispersive Bodies formed by Metallic Wires
In media with strong spatial dispersion the electric displacement vector and
the electric field are typically linked by a partial differential equation in
the bulk region. The objective of this work is to highlight that in the
vicinity of an interface the relation between the macroscopic fields cannot be
univocally determined from the bulk response of the involved materials, but
requires instead the knowledge of internal degrees of freedom of the materials.
We derive such relation for the particular case of "wire media", and describe a
numerical formalism that enables characterizing the electromagnetic response of
arbitrarily shaped spatially dispersive bodies formed by arrays of crossed
wires. The possibility of concentrating the electromagnetic field in a narrow
spot by tapering a metamaterial waveguide is discussed.Comment: 34 pages, 10 figure
Telerobotics test bed for space structure assembly
A cooperative research on super long distance space telerobotics is now in progress both in Japan and USA. In this program. several key features will be tested, which can be applicable to the control of space robots as well as to terrestrial robots. Local (control) and remote (work) sites will be shared between Electrotechnical Lab (ETL) of MITI in Japan and Jet Propulsion Lab (JPL) in USA. The details of a test bed for this international program are discussed in this report
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