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排序方式: 共有298条查询结果,搜索用时 15 毫秒
1.
X. S. Ning K. Suganuma T. Okamoto A. Koreeda Y. Miyamoto 《Journal of Materials Science》1989,24(8):2879-2883
Two kinds of additive-free silicon nitride ceramics were brazed with aluminium; one was with as-ground faying surfaces and
the other was with faying surfaces heat-treated at 1073K for 1.8 ksec in air. The heat-treatment of the silicon nitride ceramics
formed a silicon oxynitride layer on the faying surfaces and increased the brazing strength of the joints. A silica-alumina
non-crystalline layer and a β′-sialon layer were formed successively from the aluminium side at the interface of the joints.
The heat-treatment which made the former layer thicker is a necessary process in making reliable, strong brazed joints. 相似文献
2.
Pulsed Electric Current Sintering of Silicon Nitride 总被引:1,自引:0,他引:1
Motohiro Suganuma Yasunori Kitagawa Shigetaka Wada Norimitsu Murayama 《Journal of the American Ceramic Society》2003,86(3):387-394
Pulsed electric current sintering (PECS) has been used to densify α-Si3 N4 powder doped with oxide additives of Y2 O3 and Al2 O3 . A full density (>99%) was achieved with virtually no transformation to β-phase, resulting in a microstructure with fine equiaxed grains. With further holding at the sintering temperature, the α-to-β phase transformation took place, concurrent with an exaggerated grain growth of a limited number of elongated β-grains in a fine-grained matrix, leading to a distinct bimodal grain size distribution. The average grain size was found to obey a cubic growth law, indicating that the growth is diffusion-controlled. In contrast, the densification by hot pressing was accompanied by a significant degree of the phase transformation, and the subsequent grain growth gave a broad normal size distribution. The apparent activation energy for the phase transformation was as high as 1000 kJ/mol for PECS, almost twice the value for hot pressing (∼500 kJ/mol), thereby causing the retention of α-phase during the densification by PECS. 相似文献
3.
4.
Degradation by Sn diffusion applied to surface mounting with Ag-epoxy conductive adhesive with joining pressure 总被引:1,自引:0,他引:1
Shear and tensile tests were carried out on joints made with an isotropic conductive adhesive (ICA) consisting of Ag and epoxy: Sn–Pb plated components mounted on printed boards and tensile bars consisting of Sn plated Ni and Cu joined under various joining pressures. After 150 °C–100 h, shear strength degraded to 72% and Sn in the plating diffused slightly to the Ag fillers in the ICA for the component mounting. High joining pressure increased the initial tensile strength and volume percentage of Ag fillers in the ICA. After 150 °C–100 h, tensile strengths for all joining pressures degraded on average to 36% of the initial strengths. In the case of low joining pressures, an Ag–Sn intermetallic was formed at only the Ag–Sn contact points of the Sn/ICA interface; leading to reproducibility of the component mounting. The difference of degradation ratios between the mounted components and tensile bars could be explained by the offset of the Sn–Pb area at the component/ICA interface. 相似文献
5.
Suganuma T. Imai S. Kinoshita T. Sugawara K. Shiratori N. 《IEEE transactions on systems, man, and cybernetics. Part A, Systems and humans : a publication of the IEEE Systems, Man, and Cybernetics Society》2003,33(5):633-641
We present a design and implementation of a flexible videoconference system (VCS) using multiagent computing technology. The proposed system, we named FVCS, aims to reduce the burden of the users under the operational environment with insufficient computational resources, such as the Internet environment with small-scale computers at homes and offices, by embedding flexibility to the conventional videoconference system. In this paper, we design and implement FVCS with knowledge-based multiagent framework to realize adaptability of FVCS. We also evaluate the adaptability of the prototype systems of FVCS based on an operational situation observed in its experiments. From the result of the experiments, we conclude that the multiagent-based design and implementation is reasonable for construction of FVCS. 相似文献
6.
Takuo Suganuma SungDoke Lee Tetsuo Kinoshita Norio Shiratori 《New Generation Computing》2001,19(2):173-191
In this paper, we propose an agent architecture to improve flexibility of a videoconference system with strategy-centric adaptive
QoS (Quality of Service) control mechanism. The proposed architecture realizes more flexibility by changing their QoS control
strategies dynamically. To switch the strategies, system considers the properties of problems occurred on QoS and status of
problem solving process. This architecture is introduced as a part of knowledge base of agent that deals with cooperation
between software module of videoconference systems. We have implemented the mechanism, and our prototype system shows its
capability of flexible problem solving against the QoS degradation, along with other possible problems within the given time
limitation. Thus we confirmed that the proposed architecture can improve its flexibility of a videoconference system compared
to traditional systems.
Takuo Suganuma, Dr.Eng.: He is a research associate of Research Institute of Electrical Communication of Tohoku University. He received a Dr.Eng.
degree from Chiba Institute of Technology in 1997. His research interests include agent-based computing and design methodology
for distributed systems. He is a member of IPSJ, IEICE and IEEE.
SungDoke Lee: He is a Ph.D. Student in the Graduate School of Information Sciences in Tohoku University. He received his MEng degree at
Chonbuk National University, Korea in 1991. His research interests include Flexible Network and Knowledge of Agent.
Tetsuo Kinoshita, Dr.Eng.: He is an associate professor of Research Institute of Electrical Communication of Tohoku University. He received a Dr.Eng.
degree in information engineering from Tohoku University, Japan. His research interests include knowledge engineering, cooperative
distributed processing and agent-based computing. He received the the IPSJ Best Paper Award in 1997, etc. He is a member of
IPSJ, IEICE, JSAI, AAAI, ACM and IEEE.
Norio Shiratori, Dr.Eng.: After receiving his Dr.Eng degree at Tohoku University, he joined the Research Institute of Electrical Communication of
Tohoku University in 1977, and is now a professor at the same University. He has been engaged in research on distributed processing
system, and flexible intelligent network. He received the 25th Anniversary of IPSJ Memorial Prize-Winning Paper Award in 1985,
the 6th Telecommunications Advancement Foundation Incorporation Award in 1991, the Best Paper Award of ICOIN-9 in 1994, the
IPSJ Best Paper Award in 1997, etc. He has been named a Fellow of the IEEE for his contributions to the field of computer
communication networks. 相似文献
7.
8.
Tohru Sugahara Yukiko Hirose Shuren Cong Hirotaka Koga Jinting Jiu Masaya Nogi Shijo Nagao Katsuaki Suganuma 《Journal of the American Ceramic Society》2014,97(10):3238-3243
Single‐ and multi‐layer transparent conductive oxide (TCO) thin films exhibiting high performance, good packing density and low surface/interface roughness are deposited on silica glass substrates by the sol–gel method. The crystal and microstructural properties of the TCO thin films are evaluated as an alternate to films prepared by ultra‐high vacuum deposition. Tin‐doped indium oxide (ITO) thin films produced using a two‐step drying process showed low surface roughness because of dense packing structure not only horizontal but also vertical directions. As a result, electrical conductivity, carrier concentration, carrier mobility, and optical transmittance of 2.3 × 103 S/cm, 8 × 1020 cm?3, 18 cm2/Vs, and over 98% at 500 nm, respectively, were achieved. A multilayer ZnO/ITO stacked structure was also fabricated using the sol–gel process. Our findings suggest that solution‐based methods show promise as an alternative to existing ultra‐high vacuum methods to fabricate TCO thin films. 相似文献
9.
Koh Matsumoto Kazutada Ikenaga Jun Yamamoto Kazuki Naito Yoshiki Yano Akinori Ubukata Hiroki Tokunaga Tadanobu Arimura Katsuaki Cho Toshiya Tabuchi Akira Yamaguchi Yasuhiro Harada Yuzaburo Ban Kousuke Uchiyama 《半导体学报》2011,32(1):21-23
Growth rate has a direct impact on the productivity of nitride LED production.Atmospheric pressure growth of GaN with a growth rate as high as 10μm/h and also Al0.1Ga0.9N growth of 1μm/h by using 4 inch by 11 production scale MOVPE are described.XRD of(002) and(102) direction was 200 arcsec and 250 arcsec, respectively.Impact of the growth rate on productivity is discussed. 相似文献
10.
Michio Horiuchi Fumimasa Katagiri Jun Yoshiike Shigeaki Suganuma Yasue Tokutake Helmut Kronemayer Wolfgang G. Bessler 《Journal of power sources》2009
The operation of a pair of anode-to-anode-facing solid oxide fuel cells (SOFCs) via in situ catalytic partial oxidation (CPO) of n-butane was investigated. In this simple “no-chamber” setup, butane is partially oxidized by heterogeneous reactions inside the porous anodes, providing processed fuel and the heat required for SOFC operation. The cell couple yielded a power density of up to 270 mW cm−2, and the maximum total power obtained was 1.2 W with cell sizes of 13 mm × 23 mm. The maximum electrical efficiency was 1.3%. High CO concentrations of up to 1000 ppm were detected in the exhaust gas, indicating that the cell couple could not efficiently consume the complete provided fuel. A flame, lit at the exhaust, minimized the carbon monoxide level while having insignificant influence on the cell performance. Thermal insulation of the cell couple improved the output remarkably, showing the strong influence of temperature on cell performance. The two cells had a distance of only 2 mm, suggesting a potential for high volumetric power densities in multi-cell configurations for a self-sustained combined heat and power system. 相似文献