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Element selective oxidation on Rh-Pd bimetallic alloy surfaces
Kondoh, Hiroshi,Toyoshima, Ryo,Shirahata, Naoki,Hoda, Asami,Yoshida, Masaaki,Amemiya, Kenta,Mase, Kazuhiko,Mun, Bongjin Simon The Royal Society of Chemistry 2018 Physical chemistry chemical physics Vol.20 No.45
<P>The interactions between oxygen and Rh-Pd bimetallic alloy surfaces were investigated using surface sensitive experimental techniques and density functional theory calculations. The alloy surfaces were oxidized under 10<SUP>−5</SUP> Torr and 100 mTorr oxygen upon heating above 250 °C. A thin Rh oxide layer was preferentially formed on a Rh1Pd9(100) surface, while a thin Pd oxide layer was formed on a Rh1Pd9(111) surface, though the Rh oxide is thermodynamically more stable irrespective of the surface orientation. Chemical analyses revealed that the initial Rh fraction for the (111) surface was significantly lower than that for the (100) surface, which suggests that the oxidized element on the surface is kinetically selected depending on the near surface initial composition.</P>
In situ analysis of catalytically active Pd surfaces for CO oxidation with near ambient pressure XPS
Kondoh, H.,Toyoshima, R.,Monya, Y.,Yoshida, M.,Mase, K.,Amemiya, K.,Mun, B.S. Elsevier Science Publishers 2016 CATALYSIS TODAY - Vol.260 No.-
<P>X-ray photoelectron spectroscopy (XPS) is useful for in situ analysis of catalytically active surfaces under reaction conditions. We conducted in situ observations of CO oxidation on Pd single-crystal surfaces with different orientations under near ambient pressure (NAP) conditions with XPS. In this short review we compare catalytically active surfaces of Pd with the different orientations. Both surface oxides and atomic oxygen chemisorbed on metallic surfaces can be active for CO oxidation depending on surface geometric structure. We propose similarity between the surface oxides and the chemisorbed oxygen from a viewpoint of availability of active oxygen. Catalytic activity of the metallic surface under NAP condition is also compared with that under ultrahigh vacuum conditions. (C) 2015 Elsevier B.V. All rights reserved.</P>
A Self-Adaptive Measurement Rate Control Method for an Agent-based Service Monitoring System
Satoshi Kondoh,Kensuke Takahashi,Masaru Sakai 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
The increasing complexity of services of telecommunications carriers has increased the burden of operators monitoring these services and the load on the system monitoring the target devices. Operators need to choose appropriate monitoring settings for each component of the services, considering the properties of each component. In addition, whenever a component is added or changed, its monitoring settings need to be reconfigured. Furthermore, if operators configure incorrect monitoring settings, service anomalies may not be detected, or quality of service may be damaged. Therefore, the monitoring system needs to automatically input and change the monitoring settings in accordance with the service. In this paper, we propose a method to dynamically adjust the monitoring interval for a monitoring system. Finally, evaluation results show the proposed method can reduce the monitoring overhead more effectively than the previous method and can also ensure the accuracy of monitoring when a service abnormality occurs.
Haruo Kondoh 한국재정학회 2015 한국재정학회 학술대회 논문집 Vol.2015 No.3
This paper clarifies whether or not the distribution of funds for road investment from the central government to local governments is affected by political incentives and whether or not the funds contribute to regional economic growth. I employ a simultaneous-equation approach in order to attain this aim, and estimate the regional distribution functions and the regional growth regression using a panel of Japanese prefectural level data for a period of 1980 to 2010. Empirical results show that, (1) conditional convergence is observed between Japanese prefectures during our sample period, (2) regional distribution of funds for road investment is affected by political factors such as governing party (LDP)’s incentive to buy votes and pressure by a local interest group, (3) the funds for road investment conducted by local governments contribute regional economic growth, but road investment funded or conducted by the central government does not. This finding indicates the possibility that road investment conducted by local governments, which is less likely to affected by distributive politics, contribute regional economy more than road investment funded or conducted by the central government does and that decentralization is desirable in order to improve efficiency of road investment.
주거환경에 있어서 녹지와의 접촉이 주민의식에 미치는 영향에 관 한 연구 -구나량 시가지를 대상으로-
박문호,Kondoh, Kimio 한국조경학회 1992 韓國造景學會誌 Vol.20 No.1
This research attempts to consider the influence of the green-contacts on the consciousness of the dwellers in the residential area of Nara. The consciousness of the dwellers is investigated by questionaire which deals with verdure, green-sufficiency and the green-contacts of dwellers. Five districts of the old residential area in Nara were selected and surveyed. The results of analysizing the investigated data summarized as follows. 1. The dwellers have a tendency to satisfy the greenery although the size of open space is small. Accordingly, the green-sufficiency is the available scale to investigate the greenery on the consciousnss of the dwellers. 2. Dwellers contact with the green space of housing as well as the surrounding failiarized-green. It was understood that the green-contacts of dwellers characterized by the kind of greenery, means and their frequency. 3. The familiarized-green contacts with the dwellers is related to the private and public uses. 4. In order to satisfy the feeling of green-sufficiency, the greenery space should be increased; it was found that green-sufficiency is satisfied by increasing the greenery space. 5. In the case of small open space, it is also possible to satisfy and attitude of green-sufficiency by introducing the familiarized-green, even if the rate of greenery space is low.
Nanocarbon-reinforced metal-matrix composites for structural applications
Guo, Qiang,Kondoh, Katsuyoshi,Han, Seung Min Cambridge University Press (Materials Research Soc 2019 MRS bulletin Vol.44 No.1
<▼1><B>Abstract</B><P/></▼1><▼2><P>Nanocarbon materials, such as carbon nanotubes, graphene, and their derivatives, are regarded as promising reinforcing agents in metal matrix composites (MMCs) because of their excellent intrinsic mechanical properties. Considering the various types of nanocarbons with different defect states and intrinsic properties, there is a potential for tailoring the mechanical behavior of nanocarbon-reinforced MMCs. This article reviews recent developments in both the processing and the structure-property correlations of these composites. Particular emphasis is given to the structure and properties of the nanocarbon-metal interfaces, as the external mechanical load is transferred between the nanocarbon and the metal matrix across their interfaces. Moreover, in addition to the intuitive load-bearing effect of the nanocarbon reinforcements, a copious interplay between nanocarbons and dislocations in the metal matrix has been found, which alters the deformation behavior that leads to additional strengthening. For structural applications, scalable fabrication routes for the nanocarbon-metal composites need to be developed, and studies on the mechanical behavior under real service conditions are needed.</P></▼2>