Institution
National Institute of Advanced Industrial Science and Technology
Government•Tsukuba, Ibaraki, Japan•
About: National Institute of Advanced Industrial Science and Technology is a government organization based out in Tsukuba, Ibaraki, Japan. It is known for research contribution in the topics: Catalysis & Thin film. The organization has 22114 authors who have published 65856 publications receiving 1669827 citations. The organization is also known as: Sangyō Gijutsu Sōgō Kenkyū-sho.
Topics: Catalysis, Thin film, Carbon nanotube, Hydrogen, Laser
Papers published on a yearly basis
Papers
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TL;DR: The results demonstrate that non-trivial pattern classification tasks can be achieved with small hardware neural networks by endowing them with nonlinear dynamical features such as oscillations and synchronization, and that the high experimental recognition rates stem from the ability of these oscillators to synchronize.
Abstract: Substantial evidence indicates that the brain uses principles of non-linear dynamics in neural processes, providing inspiration for computing with nanoelectronic devices. However, training neural networks composed of dynamical nanodevices requires finely controlling and tuning their coupled oscillations. In this work, we show that the outstanding tunability of spintronic nano-oscillators can solve this challenge. We successfully train a hardware network of four spin-torque nano-oscillators to recognize spoken vowels by tuning their frequencies according to an automatic real-time learning rule. We show that the high experimental recognition rates stem from the high frequency tunability of the oscillators and their mutual coupling. Our results demonstrate that non-trivial pattern classification tasks can be achieved with small hardware neural networks by endowing them with non-linear dynamical features: here, oscillations and synchronization. This demonstration is a milestone for spintronics-based neuromorphic computing.
246 citations
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TL;DR: A series of coumarin dyes with one or two -CN groups as electron acceptors were synthesized and applied as dye sensitizers for dye-sensitized solar cells.
Abstract: A series of coumarin dyes (NKX-2593, NKX-2807, and NKX-2883) with one or two -CN groups as electron acceptors were synthesized and applied as dye sensitizers for dye-sensitized solar cells. Compared with the dye containing one -CN group, linking one more -CN group to the π-conjugation bridge positively shifts the lowest unoccupied molecular orbital and thus red-shifts the maximum absorption band, harvesting more photons in the long-wavelength region for photoelectric conversion. Among the three dyes studied, NKX-2883 showed the best photovoltaic performance, yielding 7.6% power conversion efficiency using a volatile electrolyte and demonstrating good photostability under visible light soaking with 6% of power conversion efficiency for 1000 h using a nonvolatile electrolyte.
246 citations
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TL;DR: It is demonstrated that wild-type Drosophila melanogaster display a robust circadian rhythm in the mating activity, and that these rhythms are abolished in period- or timeless-null mutant flies (per01 and tim01).
Abstract: The physiological and behavioral activities of many animals are restricted to specific times of the day. The daily fluctuation in the mating activity of some insects is controlled by an endogenous clock, but the genetic mechanism that controls it remains unknown. Here we demonstrate that wild-type Drosophila melanogaster display a robust circadian rhythm in the mating activity, and that these rhythms are abolished in period- or timeless-null mutant flies (per01 and tim01). Circadian rhythms were lost when rhythm mutant females were paired with wild-type males, demonstrating that female mating activity is governed by clock genes. Furthermore, we detected an antiphasic relationship in the circadian rhythms of mating activity between D. melanogaster and its sibling species Drosophila simulans. Female- and species-specific circadian rhythms in the mating activity of Drosophila seem to cause reproductive isolation.
246 citations
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TL;DR: In this paper, the intercalation of large organic ammonium ions (tetramethylammonium ion (TMA+), tetraethylammium (TEA+), TEA+ and TPA+ into layered graphite oxide (GO) was systematically investigated.
Abstract: The intercalation of large organic ammonium ions (tetramethylammonium ions (TMA+), tetraethylammonium ions (TEA+), tetrapropylammonium ions (TPA+), and tetrabutylammonium ions (TBA+)) into layered graphite oxide (GO) was systematically investigated. The intercalation reactions were completed at 25 °C after 3 days, and stable colloidal suspensions were obtained at TAAl/Hs = 5 (molar ratio of tetraalkylammonium ions (TAA+) over exchangeable protons in GO). The sediments after centrifuging the colloidal suspensions showed amorphous phase X-ray diffraction patterns, indicating that exfoliation of the layered structure into nanosheets took place in the suspension. When the sediments were dried at 70 °C for 3 days, layered structures of TAA+-intercalated GO materials with basal spacings of 1.56, 1.67, 1.84, and 2.37 nm, respectively, appeared. The basal spacing of the layered compounds decreased with a decrease of relative humidity during drying. When the dried TAA+-intercalated GO compounds were exposed to a h...
245 citations
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01 Jan 2017TL;DR: In this article, the NH 3 -air combustion power generation has been successfully realized using a 50kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan.
Abstract: For the first time, NH 3 –air combustion power generation has been successfully realized using a 50 kW class micro gas turbine system at the National Institute of Advanced Industrial Science and Technology (AIST), Japan. Based on the global demand for carbon-free power generation as well as recent advances involving gas-turbine technologies, such as heat-regenerative cycles, rapid fuel mixing using strong swirling flows, and NO x reduction using selective catalytic reduction (SCR), allow us to realize NH 3 –air combustion gas-turbine system, which was abandoned in the 1960′s. In the present system, the combustor adopted gaseous NH 3 fuel and diffusion combustion to enhance flame stability. The NH 3 pre-cracking apparatus for combustion enhancement using generated H 2 was not employed. The NH 3 –air combustion gas-turbine power generation system can be operated over a wide range of power and rotational speeds, i.e., 18.4 kW to 44.4 kW and 70,000 rpm to 80,000 rpm, respectively. The combustion efficiency of the NH 3 –air gas turbine ranged from 89% to 96% at 80,000 rpm. The emission of NO and unburnt NH 3 depends on the combustor inlet temperature. Emission data indicates that there are NH 3 fuel-rich and fuel-lean regions in the primary combustion zone. It is presumed that unburnt NH 3 is released from the fuel-rich region, while NO is released from the fuel-lean region. When diluted air enters the secondary combustion zone, unburnt NH 3 is expected to react with NO through selective non-catalytic reduction (SNCR). NH 3 CH 4 –air combustion operation tests were also performed and the results show that the increase of the NH 3 fuel ratio significantly increases the NO emission, whereas it decreases the NO conversion ratio. To achieve low NO x combustion in NH 3 –air combustion gas turbines, it is suggested to burn large quantities of NH 3 fuel and produce both rich and lean fuel mixtures in the primary combustion zone.
245 citations
Authors
Showing all 22289 results
Name | H-index | Papers | Citations |
---|---|---|---|
Takeo Kanade | 147 | 799 | 103237 |
Ferenc A. Jolesz | 143 | 631 | 66198 |
Michele Parrinello | 133 | 637 | 94674 |
Kazunari Domen | 130 | 908 | 77964 |
Hideo Hosono | 128 | 1549 | 100279 |
Hideyuki Okano | 128 | 1169 | 67148 |
Kurunthachalam Kannan | 126 | 820 | 59886 |
Shaobin Wang | 126 | 872 | 52463 |
Ajit Varki | 124 | 542 | 58772 |
Tao Zhang | 123 | 2772 | 83866 |
Ramamoorthy Ramesh | 122 | 649 | 67418 |
Kazuhito Hashimoto | 120 | 781 | 61195 |
Katsuhiko Mikoshiba | 120 | 866 | 62394 |
Qiang Xu | 117 | 585 | 50151 |
Yoshinori Tokura | 117 | 858 | 70258 |