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排序方式: 共有35条查询结果,搜索用时 31 毫秒
1.
Ken-ichi Kohichi Hiroyuki Shiro Satoshi Hitoshi Atsushi 《Sensors and actuators. B, Chemical》2008,130(2):707-712
Pt-loaded metal oxides [WO3/ZrO2, MOx/TiO2 (MOx = WO3, MoO3, V2O5), WO3 and TiO2] equipped with interdigital Au electrodes have been tested as a NOx (NO and NO2) gas sensor at 500 °C. The impedance value at 4 Hz was used as a sensing signal. Among the samples tested, Pt-WO3/TiO2 showed the highest sensor response magnitude to NO. The sensor was found to respond consistently and rapidly to change in concentration of NO and NO2 in the oxygen rich and moist gas mixture at 500 °C. The 90% response and 90% recovery times were as short as less than 5–10 s. The impedance at 4 Hz of the present device was found to vary almost linearly with the logarithm of NOx (NO or NO2) concentration from 10 to 570 ppm. Pt-WO3/TiO2 showed responses to NO and NO2 of the same algebraic sign and nearly the same magnitude, while Pt/WO3 and WO3/TiO2 showed higher response to NO than NO2. The impedance at 4 Hz in the presence of NO for Pt-WO3/TiO2 was almost equal at any O2 concentration examined (1–99%), while in the case of Pt/WO3 and WO3/TiO2 the impedance increased with the oxygen concentration. The features of Pt-WO3/TiO2 are favorable as a NOx sensor that can monitor and control the NOx concentration in automotive exhaust. The effect of WO3 loading of Pt-WO3/ZrO2-based sensor is studied to discuss the role of surface W-OH sites on the NOx sensing. 相似文献
2.
Hirofumi Matsuda Makoto Kuwabara Kohichi Hamamoto 《Journal of the American Ceramic Society》1998,81(1):229-232
Thin, semiconducting BaTiO3 ceramic wires prepared in the present study exhibited reversible stress-induced, nonlinear current—;voltage characteristics across several grain boundaries. A remarkable change in resistance with the application (by the three-point bending method) of only ∼1% tensile deformation indicated that the BaTiO3 wires may have potential as stress-sensing devices. Resistance in the BaTiO3 wires bot increased and decreased with increasing tensile stress parallel to the electric fields, far below the ferroelectric transition temperature, T c ; in Sr-substituted wires near T c , on the other hand, resistance only increased. Detailed studies of the patterns and fluctuation of polarization at grain boundaries could be meaningful, because stress-sensing characteristics may be induced by changes in the relative angle between polarization vectors of adjacent grains. 相似文献
3.
Kazuo Taki Tatsuhiro Seki Sakiyori Mononobe Kohichi Kato 《Water science and technology》2008,57(1):19-25
Any kind of blue-green alga produces metabolites of musty substances and toxins. Therefore, it is necessary to remove the blue-green algae, and processing also including nutrient removal is desired for the water quality improvement of eutrophic lakes. The purpose of this study has been to investigate the possibility of a flotation system using a hybrid technique (chemical compounds and electrostatic bridge) applied to raw water containing phytoplankton with high pH of water, and to examine the zeta potential value of phytoplankton surface and the removal efficiency for phytoplankton, ammonia, nitrogen, and phosphoric acid.The results were as follows: firstly, zeta potential of M. aeruginosa particles was observed to achieve charge neutralization on their surface by adhesion of magnesium hydroxide precipitation with increasing pH. Secondly, maximum removal efficiency concerning chlorophyll-a was observed as 84%, and this efficiency was obtained in the condition of pH > 10, and magnesium hydroxide precipitation was observed. Thirdly, in the pH condition that the maximum removal efficiency of chlorophyll-a was obtained, the removal efficiency and the amount of decrease of NH(4)-N and PO(4)-P before and after the change of pH values were observed as 6.7% (0.04 mg-P/L) and 63.6% (0.07 mg-N/L), respectively. 相似文献
4.
5.
We propose a new multidimensional homomorphic operator that replaces the conventional complex cepstrum transformation. We treat multidimensional signals of finite support since any signal we can actually observe and deal with is of finite support. We first show that for any sequence of finite support there exists a coordinate transformation that transforms the support of a given sequence into the first quadrant in the multidimensional signal space. We then propose a new multidimensional homomorphic operator Ψ which transforms a sequence of finite support into another sequence of finite support in the first quadrant. It is proved that the operator Ψ is an isomorphism between two multidimensional signal spaces of finite support where finite convolution and usual addition, respectively, are defined as binomial operations. It is also shown that unlike the conventional complex cepstrum, the proposed operator Ψ is quite simple to compute and requires no complicated procedure like phase unwrapping, while it maintains the special features of the conventional complex cepstrum transformation that are useful in homomorphic signal processing. Moreover we clarify some algebraic structure of the multidimensional signal space with the finite convolution as a binomial operation. Finally it is shown by a numerical example that the deconvolution system using the proposed operator Ψ gives a much better result than the conventional complex cepstrum method 相似文献
6.
Akiko Kumada Kunihiko Hidaka Kouji Amano Kohichi Itoh 《IEEJ Transactions on Electrical and Electronic Engineering》2009,4(1):133-135
In recent years, a new effective method of processing for polychlorinated biphenyls (PCBs) has been developed: It enables PCBs to become harmless by dechlorinating them using a 2.45 GHz microwave (MW). Compared with conventional thermal heating, MW processing hardly produces any harmful byproduct materials, and has high reaction velocity. To investigate such promotion of chemical reaction by MW irradiation, the surface temperature of the catalyst is measured by an infrared camera just after the irradiation by MW. It is recognized that there are some heated regions on the catalyst and the temperature is not uniform. It is natural to say that chemical reaction is promoted well on such a heated region. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
7.
Akiko Kumada Kunihiko Hidaka Kouji Amano Kohichi Itoh 《IEEJ Transactions on Electrical and Electronic Engineering》2009,4(2):297-299
A new effective processing for polychlorinated biphenyls (PCBs) has been recently developed. PCBs become harmless by dechlorination using 2.45 GHz-microwave (MW). To investigate such chemical reaction by MW irradiation, the dielectric loss of pure PCBs solutions and an isomer mixture in MW band is measured. Some PCBs and isopropyl alchol, added as a source of hydrogen supply have high dielectric loss in MW band. This suggests that MW heats PCBs and isopropyl alchol, and then the temperature of the solvent consisting mainly of insulating oil rises by the thermal conduction. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
8.
Toshiyuki Nagata Kentaro Minami Masatatsu Yamamoto Tsubasa Hiraki Masashi Idogawa Katsumi Fujimoto Shun Kageyama Kazuhiro Tabata Kohichi Kawahara Kazuhiro Ueda Ryuji Ikeda Yukio Kato Masaaki Komatsu Akihide Tanimoto Tatsuhiko Furukawa Masami Sato 《International journal of molecular sciences》2021,22(21)
9.
Huzo Kato Kohichi Ohtani Takehru Kohri Masahiro Morikura Masahiro Umehira Shuji Kubota 《International Journal of Satellite Communications and Networking》1988,6(3):289-300
Devices and architectures for on-board SCPC (single channel per carrier) multi-carrier demodulators suitable for use in satellites to be launched between the present and the year 2000 are discussed in the light of trends in the development of device technology towards lower on-board weight and power consumption. It is shown that at the present time (equivalent to about 1990 for on-board use). The choice of demodulation scheme depends on the number of channels available for regeneration on board the satellite. The total weight and power consumption for several suitable on-board multicarrier demodulation schemes are predicted for 1990, 1995 and 2000, as functions of the number of channels to be regenerated. 相似文献
10.
In order to obtain CO2-absorbents to eliminate CO2 concentration locally, Bi2O3-La2O3 mixed powders were prepared by mechanical alloying (MA) method using a planetary ball-milling machine. CO2-absorption and desorption properties were checked by TG-DTA for the obtained powder samples. As a result, the sample shown by (Bi2O3)1−x(La2O3)x [x≤0.50] was found to form α-Bi2O3-solid solution with repeated CO2-adsorption and desorption around 400- 500 °C. Absorbed and desorbed CO2 contents varied with MA time: the 72 h MA’ed sample had a larger CO2 content than the 24 h MA’ed sample. The performance depended on the sample composition, and (Bi2O3)0.70(La2O3)0.30 was found to have the highest performance in the present system. 相似文献