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Institution

University of Electro-Communications

EducationTokyo, Japan
About: University of Electro-Communications is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Laser & Robot. The organization has 8041 authors who have published 16950 publications receiving 235832 citations. The organization is also known as: UEC & Denki-Tsūshin Daigaku.


Papers
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Journal ArticleDOI
TL;DR: It is shown that the polymerization shrinkage can be reduced as low as 0.3% at the nanoparticle concentration of 35 vol.
Abstract: We demonstrate substantial shrinkage suppression of nanoparticle-polymer composite transmission gratings by use of the step-growth polymerization mechanism. It is shown that the polymerization shrinkage can be reduced as low as 0.3% at the nanoparticle concentration of 35 vol. % by which the refractive index modulation and the material sensitivity are maximized to be 8×10−3 and 1014 cm/J, respectively, in the green. Our results offer a noticeable advance in the development of holographic data storage materials.

56 citations

Journal ArticleDOI
01 Sep 2002-Icarus
TL;DR: In this article, a 5.8h observation period centered at 11:25 UT on Nov. 18, 1999, in Japan was used to detect five brightening streaks observed on the night side of the Moon during the 1999 Leonid meteor shower.

56 citations

01 Apr 2012
TL;DR: In this article, the authors used simultaneous ground-based, all-sky camera observations from a geomagnetically conjugate Iceland-Syowa Station pair to demonstrate that the auroral beads, whose wavelength is ∼30-50 km, evolve synchronously in the northern and southern hemispheres and have remarkable interhemispheric similarities.
Abstract: [1] Auroral beads, i.e., azimuthally arrayed bright spots resembling a pearl necklace, have recently drawn attention as a possible precursor of auroral substorms. We used simultaneous, ground-based, all-sky camera observations from a geomagnetically conjugate Iceland-Syowa Station pair to demonstrate that the auroral beads, whose wavelength is ∼30–50 km, evolve synchronously in the northern and southern hemispheres and have remarkable interhemispheric similarities. In both hemispheres: 1) they appeared almost at the same time; 2) their longitudinal wave number was similar ∼300–400, corresponding bead separation being ∼1° in longitude; 3) they started developing into a larger scale spiral form at the same time; 4) their propagation speeds and their temporal evolution were almost identical. These interhemispheric similarities provide strong evidence that there is a common driver in the magnetotail equatorial region that controls the major temporal evolution of the auroral beads; thus, the magnetosphere plays a primary role in structuring the initial brightening arc in this scale size.

56 citations

Journal ArticleDOI
TL;DR: Heuristic algorithms for SCP are surveyed focusing mainly on contributions of mathematical programming techniques to heuristics, and their performance through experimental analysis is illustrated.
Abstract: The set covering problem (SCP) is one of representative combinatorial optimization problems, which has many practical applications. The continuous development of mathematical programming has derived a number of impressive heuristic algorithms as well as exact branch-and-bound algorithms, which can solve huge SCP instances of bus, railway and airline crew scheduling problems. We survey heuristic algorithms for SCP focusing mainly on contributions of mathematical programming techniques to heuristics, and illustrate their performance through experimental analysis.

56 citations

Journal ArticleDOI
TL;DR: In this article, the superplastic properties and microstructural evolution of a 7055 aluminum alloy were examined in tension at temperatures ranging from 300 to 450°C and strain rates ranging from 2.7 to 5.6.
Abstract: The superplastic properties and microstructural evolution of a 7055 aluminum alloy was examined in tension at temperatures ranging from 300 to 450 °C and strain rates ranging from 2.7 × 10 −5 to 5.6 × 10 −2 s −1 . A refined microstructure with an average grain size of ∼1.4 μm and a portion of high-angle grain boundaries (HAGBs) of ∼67% was produced in sheets by equal channel angular extrusion (ECAE) followed by isothermal rolling (IR) at 250 °C. The alloy exhibited a maximum elongation-to-failure of ∼820% at a temperature of 450 °C and an initial strain rate of 5.6 × 10 −3 s −1 . Superplastic elongation of ∼670% was recorded at strain rates higher than 10 −2 s −1 , where the strain rate sensitivity coefficient was around 0.44. The relationship between superplastic ductilities and microstructure stability was analyzed. It was shown that increasing the portion of HAGBs by IR results in enhancement of superplastic properties.

56 citations


Authors

Showing all 8079 results

NameH-indexPapersCitations
Mildred S. Dresselhaus136762112525
Matthew Nguyen131129184346
Juan Bisquert10745046267
Dapeng Yu9474533613
Riichiro Saito9150248869
Shun-ichi Amari9049540383
Shigeru Nagase7661722099
Ingrid Verbauwhede7257521110
Satoshi Hasegawa6970822153
Yu Qiao6948429922
Yukio Tanaka6874419942
Zhijun Li6861414518
Iván Mora-Seró6723523229
Kazuo Tanaka6353527559
Da Xing6362414766
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202317
202258
2021644
2020815
2019908
2018837