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排序方式: 共有394条查询结果,搜索用时 15 毫秒
91.
Shigeya Sakaguchi Kenji Nakahara Yasunori Hayashi 《Metals and Materials International》1999,5(2):193-195
Ti-30mass%Mo alloy is characterized by far better corrosion resistance than pure titanium in non-oxidizing acid such as 35%
HC1 solution. This alloy was newly developed in this work by a powder metallurgical process, because the conventional melting-casting
process had difficulties in manufacturing the alloy owing to its heavy gravity segregation. The corrosion behavior of sintered
Ti-30Mo alloy was studied by both immersion test and electro-chemical measurement. The corrosion rate of 1.3X10−2[mm/yearxxx] was obtained by immersion test in 35% HC1 solution, which was 103 times superior to that of pure titanium. The potentio-dynamic polarization curve of this alloy in 35% HC1 solution showed
more noble corrosion potential and lower anodic current density than those of pure titanium. The passive film formed on the
alloy, in which Mo was enriched by preferential dissolution of titanium, thought to suppress the anodic reaction and improve
its corrosion resistance. 相似文献
92.
Yasunori Wakasawa Masatoshi Hashimoto Etsuo Marui 《International Journal of Machine Tools and Manufacture》2004,44(14):1527-1536
Efficient manufacturing is achieved by the damping capacity improvement of machine tool structure. The purpose of this study is to clarify the parameters influencing the damping capacity of machine tool structures packed with balls. In structures closely packed with balls, various damping characteristics appear in correspondence with the ball size and other conditions. The effect of ball size is the most significant factor in these structures. Excitation of structure is necessary for close packing, however, this process is troublesome. Excitation of structure is required to achieve an optimum packing ratio where the maximum damping capacity is obtained. For a 50% packing ratio, this excitation process is not necessary to obtain a stable damping capacity. Therefore, the effects of magnitude of impulse, packed ball material, and structure size on the damping capacity are investigated at a 50% packing ratio. Finally, actual machine tool structure models are constructed, and the effectiveness of the balls packing for the damping capacity improvement is investigated. 相似文献
93.
Kiyohiko Hattori Naoki Tatebe Toshinori Kagawa Yasunori Owada Lin Shan Katsuhiro Temma Kiyoshi Hamaguchi Keiki Takadama 《Artificial Life and Robotics》2016,21(4):434-442
This paper proposes a novel method for deploying a wireless mesh network (WMN) using a group of swarm robots equipped with wireless transceivers. The proposed method uses the rough relative positions of the robots estimated by their Radio Signal Strength Indicators (RSSIs) to deploy the WMN. The employed algorithm consists of three parts, namely, (1) a fully distributed and dynamic role decision method among the robots, (2) an adaptive direction control using the time difference of the RSSIs, and (3) a narrow corridor for the robots to pass by movement function along walls. In our study, we evaluated the performances of the proposed deployment method and a conventional method in a real environment using 12 real robots for simple deployment, and 10 real robots for passing the narrow corridor. The results of the performed experiments showed that (1) the proposed method outperformed the conventional method with regard to the deployment time, power consumption, and the distances traveled by the robots, and (2) the movement function along the walls is effective while passing a narrow corridor unlike any other function. 相似文献
94.
The three strain energy release rates, GIC, GIIC, and GIIIC, of adhesive joints can be attributed to their ability to resist crack propagation of solids in the adhesive layer. The dependencies of GIC, GIIC, and GIIIC on crack lengths for various adhesive joints were determined using the double-cantilever beam specimen by a compliance method. The two types of adhesive strengths, i.e., adhesive tensile strength and adhesive shear strength, corresponding to GIC and GIIC, respectively, were carried out at room temperature and 65% RH with a crosshead speed of 10 mm/min. The GIC, GIIC, and GIIIC were dependent upon crack length and had constant values irrespective of geometric parameters of the specimen over the crack length of five times adherend thickness, 0.65 (= crack length over half a length of span) and eight times adherend thickness, respectively. In the region of the crack length, we determined the following increasing order of fracture toughness: GIC < GIIIC < GIIC. A positive correlation was found between adhesive tensile strength and GIC. A significant relation between adhesive shear strength and GIIC was not found in this work. Further studies are needed to clarify the relation between adhesive shear strength and GIIC with general adhesives. © 1994 John Wiley & Sons, Inc. 相似文献
95.
Hitoshi Sasaki Yasunori Oumi Masahiro Sadakane Tsuneji Sano 《Journal of the European Ceramic Society》2010,30(6):1537-1541
Single phase Ca-α-SiAlON was synthesized for the first time by the carbothermal reduction-nitridation of a physical mixture of Y-type zeolite and CaO. Under well-optimized conditions, which included both a Si/Al ratio of 2.8 for the starting Y-type zeolite and a Ca/Al ratio of 0.63–0.75, highly crystalline, pure Ca-α-SiAlON was obtained. The formation of pure Ca-α-SiAlON was also confirmed by 27Al and 29Si MAS NMR measurements. 相似文献
96.
Yasunori Ino Wataru Kuriyama Osamu Ogata Takaji Matsumoto 《Topics in Catalysis》2010,53(15-18):1019-1024
A ruthenium complex was found to catalyze the hydrogenation of chiral esters without the loss of their optical purities under mild and neutral conditions. This method can avoid a violent quench step and an extraction step which accompany conventional reduction using metal hydride reagents such as sodium borohydride and lithium aluminum hydride. 相似文献
97.
98.
Yoshihiro Kusano Akira Doi Minoru Fukuhara Makoto Nakanishi Tatsuo Fujii Jun Takada Yasunori Ikeda Mikio Takano Catherine Henrist Rudi Cloots ré Rulmont Marcel Ausloos 《Journal of the American Ceramic Society》2009,92(8):1840-1844
The effects of oxygen partial pressure during thermal treatment on the color and microstructure of Bizen, a traditional Japanese stoneware, were studied through model experiments using clay pellets covered lightly with rice straw as a coloring assistant. When heated in flowing nitrogen, the model pellet turned blackish owing to the formation of α-Fe particles coated with graphite. However, schreibersite (Fe3 P), which is also blackish, was formed specifically on the pellet surface in direct contact with the straw. The rice straw seems to have generated a strongly reducing atmosphere, strong enough for the metallization to α-Fe, and also to have provided phosphorus through contact. When oxygen content in the surrounding gas atmosphere was raised to N2 /O2 =99/1, the pellet surface turned yellowish brown because the main coloring material was Fe3+ -containing mullite. At oxygen contents of N2 /O2 =98/2 or more, the formation of hematite (α-Fe2 O3 ) pushed the color to deep red. 相似文献
99.
In this paper asymptotic distributions of the three commonly used multivariate test statistics, viz.: Likelihood Ratio, Lawley–Hotelling
and Bartlett–Nanda–Pillai statistics, are studied for one-way MANOVA hypothesis when the responses are non-normal and the
hypothesis degrees of freedom is large. The null as well as the non-null distributions are derived for the balanced as well
as unbalanced cases. The results show that these statistics have asymptotic normal distributions. A simulation study reveals
the approximations are quite good for number of treatments as small as 15 in the null case. Hence, the results can be applied
in real life situation where the assumption of multivariate normality is not tenable. Such situations arise, for example,
in agricultural screening trials where large number of cultivars are compared with few replications per cultivar.
相似文献
100.
There are many reports about faulty status in building air-conditioning systems recently. It becomes difficult to keep indoor air temperature appropriately as faults occur, and the faults cause waste of building energy consumption. The model-based fault detection and diagnosis (FDD) methods have been researched for specific parts of air-conditioning system such as chillers, coils, variable air volume units (VAV units), etc. It needs, however, much time and labor to monitor and check every single part because we cannot predict where and when the faults occur. The purpose of this study is to examine indoor air temperature changes and energy consumption increase when faults occur and to develop an easy-to-use FDD tool that helps to find out the faulty place through the whole building air-conditioning system. And then, we treat the reliability of the proposed FDD tool and effectiveness to control of indoor environment deterioration and energy consumption increase by the tool is evaluated based on building air-conditioning system simulation in this paper. 相似文献