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排序方式: 共有453条查询结果,搜索用时 15 毫秒
101.
Yasushi Ozawa Yoshihisa Tochihara Noriyuki Mori Isao Yuri Junichi Sato Koji Kagawa 《Catalysis Today》2003,83(1-4):247-255
A catalytically assisted ceramic combustor for a gas turbine was designed and tested to achieve low NOx emissions. This combustor is composed of a burner and a ceramic liner. The burner consists of an annular preburner, six catalytic combustor segments and six premixing nozzles, which are arranged in parallel and alternately. In this combustor system, catalytic combustion temperature is controlled under 1000 °C, premixed gas is injected from the premixing nozzles to the catalytic combustion gas and lean premixed combustion over 1300 °C is carried out in the ceramic liner. This system was designed to avoid catalyst deactivation at high temperature and thermal shock fracture of the ceramic honeycomb monolith of the catalyst. A 1 MW class combustor was tested using LNG fuel. Firstly, NOx emissions from the preburner were investigated under various pressure conditions. Secondly, two sets of honeycomb cell density catalysts and one set of thermally pretreated catalysts ware applied to the combustor, and combustion tests were carried out under various pressure conditions. As a result, it was found that the main source of NOx was the preburner, and total NOx emissions from the combustor were approximately 4 ppm (at 16% O2) at an adiabatic combustion temperature of 1350 °C and combustor inlet pressure of 1.33 MPa. 相似文献
102.
Naoki Sasaki Toyohiro Uchiumi Yoshihisa Sugo Noboru Nishida Shigeatsu Yamaguchi 《Polymer Bulletin》1984,12(3):215-222
Summary Molecular motions of elastomers under deformations were observed through dynamic mechanical measurements. Composite master curves of dynamic moduli E and E and loss tangent tan over a wide range of frequency and in a state of elongation were obtained by the time-temperature superposition procedure. It is found that both moduli increase with strain, . The slope of the dispersion curve of E become more gradual with the increase in , while that of E is almost unchanged. The increment of E is generally larger than that of E, which does not agree with the N. W. Tschoegl prediction, E
*
()=f() E
o
*
(), where E
*
() and E
o
*
() are complex moduli at the strain of and O, respectively, and f() is the function of only . The difference in the strain dependence of E from E was found to correspond to the strain dependence of the equilibrium modulus. 相似文献
103.
The cationic polymerization of 1,3,5‐trioxane, 1,3‐dioxolane and a small amount of 2‐hydroxyacetic acid (HAA) was carried out, and the resulting modified‐polyacetal (POM) was blended with thermoplastic polyurethane (TPU) in melt. The results of 1H NMR analysis indicated that HAA was almost incorporated in the modified‐POM, and that the resulting carboxyl end‐group and hydroxyl end‐group in the modified‐POM reacted with TPU during the melt blending. There were many boundary layers between the cavities and matrix in the modified‐POM/TPU (82/18 by weight) blend that was etched with tetrahydrofuran (THF), and the diameter of the cavities became ~0.3–1 μm long when the blending time reached 10 min. The results of scanning electron microscopic (SEM) observation and dynamic mechanical analysis (DMA) indicated that the modified‐POM/TPU blend had a good compatibility because of the interfacial reaction between the modified‐POM and TPU phase in the blend. The modified‐POM/TPU blend exhibited higher Charpy impact strength when compared with a normal‐POM/TPU blend; the toughness of the modified‐POM/TPU blend attributed to the good compatibility between the two phases. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4375–4382, 2006 相似文献
104.
Kenji Ochi Yoshihisa Kato Tohru Saito Kiyofumi Kurihara Kazuo Kojima 《Korean Journal of Chemical Engineering》1997,14(5):365-368
A newly developed laser light scattering technique was used for the determination of mutual solubilities in the aniline+cydohexane
system at moderate pressures. The liquid-liquid equilibria (LLE) were measured from the region of solid-liquid equilibria
(SLE) to the upper critical solution temperature. Freezing points in this system were determined by a cooling curve method.
The solubility data were correlated with the NRTL equation. 相似文献
105.
106.
为了实现高速高精度定位,在RBF神经网络单步预测模型的基础上,建立多步预测控制系统,为当前高速定位控制提供操作指导。在定位过程中通过预测位置与实际位置比较,灵活调整定位速度。实验表明神经网络预测控制是实现高速高精度定位的有效手段。 相似文献
107.
Using laser brazing process, we made the dissimilar joint of the boron nitride and tungsten carbide with an excellent functionality. In order to investigate the characteristic of joint, observation and structural analysis of its interface by the electron probe micro-analysis (EPMA) and the scanning acoustic microscopy were performed. The wetting property between h-BN and Ag–Cu–Ti braze was excellent, therefore no gaps were seen between them. Moreover, it was suggested that the Ti element, which is the active ingredient in Ag–Cu–Ti braze, reacted with N in h-BN to generate Ti–N composite phase as an interfacial precipitation and the generation of Ti–N composite phase was affected by the concentration of Ti in Ag–Cu–Ti braze. All fracture was formed in h-BN body near the interface and it seemed that the distribution of shear strength of 1.25%Ti to 1.68%Ti was within the margin of variation of bulk strength of h-BN. 相似文献
108.
Saburo Akiyama Nikako Tsukiji Isamu Akiba Minoru Inoue Yoshihisa Kano 《Polymer International》2001,50(6):659-662
The relationship between the surface composition and the rate of solvent evaporation (R) in blend films of poly(vinylidene fluoride‐co‐hexafluoroacetone) (P(VDF‐HFA)) and poly(2‐ethylhexyl acrylate‐co‐acrylic acid‐co‐vinyl acetate) (P(2EHA‐AA‐VAc)) has been investigated. P(VDF‐HFA), a low‐surface tension component, was concentrated on the surface when R was relatively high. In contrast, when R was relatively low, P(2EHA‐AA‐VAc), a low‐density component, was concentrated on the surface. Therefore, it is speculated that the factors dominating surface enrichment in polymer blends were changed from surface tension differences to density differences between the components when R was decreased. In addition, the affinity between components and substrate strongly affects the dominant factors determining the surface composition. © 2001 Society of Chemical Industry 相似文献
109.
Keiko Kushida-abdelghafar Masahiko Hiratani Kazuyoshi Torii Yoshihisa Fujisaki 《组合铁电体》2013,141(1-3):113-119
Abstract The mechanism of TiN barrier metal oxidation of Pt/TiN electrodes are investigated for planarized stacked memory utilizing lead zirconate titanate (PZT). Thinner (<100 nm) and highly oriented platinum films are required in gigabit scale ferroelectric nonvolatile memories whose capacitor size is comparable to PZT grain size. Oxygen diffusivity to oxidize TiN is found to depend on the Pt film thickness. In cross-sectional TEM images of PZT/Pt/TiN/Si, titanium oxide is observed beneath the Pt grain boundary. The oxygen is diffused through the Pt grain boundary under heat treatment in an oxygen atmosphere for crystallization of PZT films, and oxidizes the underlying TiN barrier metal. 相似文献
110.
Kashima Yoshihisa; Woolcock Jodie; Kashima Emiko S. 《Canadian Metallurgical Quarterly》2000,107(4):914
Group impressions are dynamic configurations. The tensor product model (TPM), a connectionist model of memory and learning, is used to describe the process of group impression formation and change, emphasizing the structured and contextualized nature of group impressions and the dynamic evolution of group impressions over time. TPM is first shown to be consistent with algebraic models of social judgment (the weighted averaging model; N. Anderson, 1981) and exemplar-based social category learning (the context model; E. R. Smith & M. A. Zárate, 1992), providing a theoretical reduction of the algebraic models to the present connectionist framework. TPM is then shown to describe a common process that underlies both formation and change of group impressions despite the often-made assumption that they constitute different psychological processes. In particular, various time-dependent properties of both group impression formation (e.g., time variability, response dependency, and order effects in impression judgments) and change (e.g., stereotype change and group accentuation) are explained, demonstrating a hidden unity beneath the diverse array of empirical findings. Implications of the model for conceptualizing stereotype formation and change are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献