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排序方式: 共有174条查询结果,搜索用时 15 毫秒
41.
Kenji Tanno Ryoichi Kurose Takenobu Michioka Hisao Makino Satoru Komori 《Advanced Powder Technology》2013,24(5):879-885
Selective catalytic reaction is a very efficient method to reduce NOx emissions from thermal power plants and is widely used in Japan. To develop a higher performance de-NOx system and optimize its maintenance schedule, it is important to understand the NOx reduction mechanism in the honeycomb channel which supports the de-NOx catalysts. In this study, the effects of duct channel flow behavior on the de-NOx reaction at the catalyst surface were investigated using a direct numerical simulation (DNS). The DNS computations were performed for three inflow conditions, one laminar and two turbulent. The results show that although the flow transitions from turbulent to laminar flow as the flow moves downstream for the turbulent inflow conditions, de-NOx reaction rates for the turbulent inflow conditions are higher than that for the laminar inflow condition even in the downstream region. This is because of the remaining cross-sectional fluid motions caused by the inflow turbulence. As a result, de-NOx efficiencies for the turbulent conditions are higher than that for the laminar case. For both laminar and turbulent inflow conditions, de-NOx reaction is suppressed in the corner regions due to the flow stagnation. 相似文献
42.
Hiroshi Nagayoshi Hiroshi Maiwa Takenobu Kajikawa 《Journal of Electronic Materials》2013,42(7):2282-2286
A thermoelectric (TE) power conditioner maintaining high efficiency over a wide input power range has been developed. Variable switching frequency operation is shown to give an improvement in efficient operating range. The input range showing more than 90% conversion efficiency is expanded to more than 25% by introducing a low-power controller circuit and variable switching frequency control. The TE power conditioner showed excellent response against a change in thermoelectric generator (TEG) output and load, making it suitable for automotive applications. 相似文献
43.
Zhongchun Chen Syuji Maekawa Takenobu Takeda 《Metallurgical and Materials Transactions A》1999,30(12):3069-3078
Thin-walled cylindrical specimens subjected to torsional prestraining are stress-reversed along the Bauschinger curve. The
Bauschinger effect (BE), yield behavior, and flow behavior of the stress-reversed mild steel were examined by using combined
loadings of axial load, internal pressure, and torsion. The results indicate that the stress-reversed steel has the same yield
stress at 0.2 pct offset strain in reloading tests of forward and reverse torsion, when the reverse strain is
=0.77 pct. Furthermore, it is possible to cause the yield stresses in forward and reverse torsion to coincide in any offset
strain. The yield locus of the stress-reversed steel is symmetric with respect to the tensile stress axis in a tension-torsion
stress field. However, it has been found to be an anisotropy in the stress-reversed steel, and the magnitude of anisotropy
is related to the offset strain. For example, there is a stronger anisotropy at 0.2 pct offset strain than at 2 pct offset
strain, even though the BE is eliminated for the former. It is shown that the reduction in the BE by stress reversal is concerned
with the relief of the long-range back-stress generated by prestraining. Besides, the roles of aging in the stress-aging process
lie in the contributions to age hardening and development of directional back-stress. 相似文献
44.
Kaset Sirisantisamrid Kitti Tirasesth Takenobu Matsuura 《International Journal of Control, Automation and Systems》2009,7(5):777-787
Most coplanar calibration algorithms determine the initial camera parameters from a single image under the assumption that
the principal point is known in advance. However, the camera orientations, the shifted principal point and the noise corrupted
on images have an influence on the estimated initial camera parameters under the above assumption. This paper proposes a useful
method to determine the initial camera parameters for coplanar calibration. The proposed method can determine the initial
camera parameters from the single image, wherein the principal point is considered as a parameter. In our experiments, both
synthetic and real images are used. The experimental results show that the proposed method provides both stable initial camera
parameters and noise robustness for changes of camera orientations, noise levels and shifts of principal point. 相似文献
45.
46.
Zhongchun Chen Keisuke Ikeda Tadasu Murakami Takenobu Takeda 《Journal of the American Ceramic Society》2000,83(5):1081-1086
Metal–ceramic composite pipes were prepared through simultaneous extrusion of different pastes by a multi-billet extrusion method. ZrO2 and stainless steel powders were chosen, and an aqueous solution of water-soluble polymer, hydroxypropyl methylcellulose (HPMC), was used as binder. The maximum extrusion pressure and the minimum amount of binder required reached their lowest values when the mixing fraction of ZrO2 powder was 0.4. The minimum amount of binder for forming the outer layers was 4%–5% higher than that for inner layers, even for the same powder. It was possible to decrease the binder content and broaden the extrudable range of the binder content by means of mixing coarse and fine powders. 相似文献
47.
Plastics and fiber-reinforced plastics (FRP) are used in the aerospace industry because of their mechanical properties. However,
despite their excellent high-temperature mechanical properties, plastics and FRP eventually deform visco-elastically at high
temperatures. Most of the research has focused on the creep behavior of FRPs, but few studies have investigated the linear
visco-elastic behavior. Linear visco-elastic behavior and non-linear visco-elastic behavior occur with physical aging in these
plastics. In this study, the non-linear visco-elastic behavior of plastics and FRP was investigated based on the bending creep
deformation of polycarbonate (PC) and polyoxymethylene (POM). Moreover, the effects of the fiber volume fraction on the creep
characteristics were investigated using glass fiber-reinforced polycarbonate (GFRPC). The creep deformation was calculated
using the linear visco-elastic theory based on these effects, and comparison between experimental and estimated data showed
that the creep analysis sufficiently predicted the creep behavior. 相似文献
48.
Tonglei Cheng Meisong Liao Weiqing Gao Zhongchao Duan Takenobu Suzuki Yasutake Ohishi 《Optical Fiber Technology》2012,18(6):498-501
A hybrid-guiding tellurite (TZNLP) photonic bandgap fiber (PBGF) with low confinement loss is presented in this paper. A detailed comparison between the hybrid-guiding tellurite PBGF in which the high-index rods (TLWMN) replace one row of air holes in the radial direction and the all-solid tellurite PBGF has been accomplished. Low confinement loss windows can be achieved in this novel fiber due to the collaborated action of two guiding mechanisms–total internal reflection and antiresonant reflection. 相似文献
49.
Takenobu Suzuki Hiroyuki Kawai Hiroyuki Nasu Mark Hughes Yasutake Ohishi Shintaro Mizuno Hiroshi Ito Kazuo Hasegawa 《Optical Materials》2011,33(12):1952-1957
The internal quantum efficiencies under sunlight and laser excitation were measured directly by an integrating sphere method for tellurite, borosilicate and fluoride glasses. The radiative quantum efficiency was also obtained by Judd–Ofelt analysis. The radiative quantum efficiency was almost 100% for tellurite and fluoride glasses and 50% for borosilicate glasses. The quantum efficiency under laser excitation was 86%, 34% and 88% for tellurite, borosilicate and fluoride glasses at a low Nd3+ content and decreased by concentration quenching. The quantum efficiency under sunlight excitation was up to 33%, 21% and 70% for tellurite, borosilicate and fluoride glasses. Nd3+-doped fluoride glass is a promising candidate for solar pumped laser applications since it has the high quantum efficiency under sunlight excitation. 相似文献
50.
Kaiming Liao Wangfeng Ding Bo Zhao Zhaoguo Li Fengqi Song Yuyuan Qin Taishi Chen Jianguo Wan Min Han Guanghou Wang Jianfeng Zhou 《Carbon》2011,(8):2862-2868
Few-layer graphene sheets were prepared by splitting expanded graphite using high-power sonication. Atomic-level calibrated scanning transmission electron microscopy was used to obtain efficient layer statistics, enabling optimization of the experimental conditions. This resulted in a two-step splitting mechanism in which the mean number of layers was first reduced to less than 20 by heating to 1100 °C and then to a few-layer region by a 5-min 104 W L−1 – power-density sonication. Raman spectroscopic analysis confirms the above mechanism and demonstrates that the sheets are largely free of defects and functional groups. 相似文献