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61.
Takeshi Fujita Hideki Abe Toyokazu Tanabe Yoshikazu Ito Tomoharu Tokunaga Shigeo Arai Yuta Yamamoto Akihiko Hirata Mingwei Chen 《Advanced functional materials》2016,26(10):1609-1616
Precious metals (Pt and Pd) and rare earth elements (Ce in the form of CeO2) are typical materials for heterogeneous exhaust‐gas catalysts in automotive systems. However, their limited resources and high market‐driven prices are principal issues in realizing the path toward a more sustainable society. In this regard, herein, a nanoporous NiCuMnO catalyst, which is both abundant and durable, is synthesized by one‐step free dealloying. The catalyst thus developed exhibits catalytic activity and durability for NO reduction and CO oxidation. Microstructure characterization indicates a distinct structural feature: catalytically active Cu/CuO regions are tangled with a stable nanoporous NiMnO network after activation. The results obtained by in situ transmission electron microscopy during NO reduction clearly capture the unique reaction‐induced self‐transformation of the nanostructure. This finding can possibly pave the way for the design of new catalysts for the conversion of exhaust gas based on the element strategy. 相似文献
62.
Correlation between Chemical Dopants and Topological Defects in Catalytically Active Nanoporous Graphene 下载免费PDF全文
63.
Cross-layer selective routing for cost and delay minimization in IEEE 802.11ac wireless mesh network
Lai I.-Wei Funabiki Nobuo Tajima Shigeto Al Mamun Md. Selim Fujita Sho 《Wireless Networks》2018,24(6):2191-2203
Wireless Networks - A Wireless Internet-access Mesh NETwork (WIMNET) provides scalable and reliable internet access through the deployment of multiple access points (APs) and gateways (GWs). In... 相似文献
64.
In this study, a three-point bendJ lc fracture-toughness test was carried out using four types of structural steels at room temperature. The values of (γ p)V, which represent the width of the region where the voids are located just ahead of the crack tip, were measured by Beacham's method [9] with the help of a scanning electron microscope (SEM). The experimental (γ p) values and the theoretical values obtained using the finite element method (FEM) or calculated fromK at initiation are in good agreement. It was found that there is a certain linear relationship between (γ p)Vand the stretched zone width (SZW), and an experimental relationship betweenJ lc andσ flow·(γ p)V which may be expressed by the following equation: $$J_{lc} = 44.1 + 0.35\sigma _{{\text{flow}}} \cdot (\gamma _{\text{p}} )V_c KJ$$ whereσ flow is the average value of the yield stress and the ultimate tensile strength. (γ p)V c represents the critical value of (γ p)V. The numerical constant 44.1 kJ m?2 is considered to be aJ lc value for brittle fracture of the material tested, according to the authors' previous results. It is possible to calculateJ lc if (γ p)V c can be measured. 相似文献
65.
Zn1−xCdxSe epitaxial growth by molecular beam epitaxy (MBE) on the GaAs (110) surface cleaved in ultra high vacuum (UHV) was investigated. The growth mode of Zn1−x CdxSe on GaAs (110) was not a simple Stranski–Krastanow type. At initial growth stage, growth mode was two-dimensional type. However, as the growth proceeds three-dimensional island growth and two-dimensional growth modes compete. As a result, two kinds of structures were spontaneously formed on the surface, pyramidal-shaped islands and ridge structures aligned to the [1
0] direction. Anisotropic in-plane strain relaxation on (110) is suggested as the formation mechanism of such structures. 相似文献
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68.
MOCVD-grown InGaAs/InAlAs HEMTs with excellent noise performance comparable to that of MBE-grown devices have been successfully fabricated. A minimum noise figure lower than 0.30 dB has been obtained with an associated gain of approximately 15 dB at 12 GHz. Furthermore, devices in ceramic packages have exhibited a minimum noise figure of 0.42 dB.<> 相似文献
69.
A consistent grayscale‐free topology optimization method using the level‐set method and zero‐level boundary tracking mesh 下载免费PDF全文
Shintaro Yamasaki Atsushi Kawamoto Tsuyoshi Nomura Kikuo Fujita 《International journal for numerical methods in engineering》2015,101(10):744-773
This paper proposes a level‐set based topology optimization method incorporating a boundary tracking mesh generating method and nonlinear programming. Because the boundary tracking mesh is always conformed to the structural boundary, good approximation to the boundary is maintained during optimization; therefore, structural design problems are solved completely without grayscale material. Previously, we introduced the boundary tracking mesh generating method into level‐set based topology optimization and updated the design variables by solving the level‐set equation. In order to adapt our previous method to general structural optimization frameworks, the incorporation of the method with nonlinear programming is investigated in this paper. To successfully incorporate nonlinear programming, the optimization problem is regularized using a double‐well potential. Furthermore, the sensitivities with respect to the design variables are strictly derived to maintain consistency in mathematical programming. We expect the investigation to open up a new class of grayscale‐free topology optimization. The usefulness of the proposed method is demonstrated using several numerical examples targeting two‐dimensional compliant mechanism and metallic waveguide design problems. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
70.
The single longitudinal mode behavior in long external cavity semiconductor lasers is discussed. Experimentally, the laser exhibits a single frequency oscillation even for an external cavity length of 100 cm. The mode selectivity of a composite cavity is shown to be insufficient to explain the experiments. Longitudinal mode coupling in semiconductor lasers is found to arise from an interference effect between the modes on the interband transition probability of electrons. Mode coupling equations are derived, which indicates that the single mode oscillation in long external cavity semiconductor lasers is brought about when the coupling strength goes beyond a critical value. It is shown that the effect of the hole burning in the external cavity semiconductor lasers is similar to that in the solitary laser. 相似文献