http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Maeda, Tetsuhiko,Nishida, Keiichi,Hasegawa, Yasuo,Kawakami, Yoshiaki,Masuda, Masao The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
Authors have proposed the Totalized Hydrogen Energy Utilization System(THEUS) for load leveling and stabilizing the grid system. THEUS consists of fuel cells, water electrolyzers, hydrogen storage and their auxiliary machinery. The basic operation for load leveling is as follows: In the nighttime, it produces hydrogen through water electrolysis by using low-cost electric power and stores the hydrogen. In the daytime, it conducts fuel cell generation using the stored hydrogen to meet the demand. Hydrogen storage equipment is the core of THEUS. In this paper, the metal hydride tank was chosen as hydrogen storage. The hydrogen desorption process is endothermic reaction. It is possible to use the cool heat for air conditioning. It is necessary to develop a useful numerical simulation code for not only the operation method but also the optimization of the structure of the tank. We developed the simulation code. The validity of the code has been improved by comparing with experimental results. Concretely, the following points were considered. (1)The thermal capacity of the tank. (2)Heat loss to the outside. (3)The copper plate effect. The simulation results become in good agreement with experimental results. And to achieve hydrogen high flow rate, new design tank performance was investigated.
Maeda, Minoru,Choi, Seyong Elsevier 2019 Journal of alloys and compounds Vol.787 No.-
<P><B>Abstract</B></P> <P>Carbon-based organic molecular gas is a well-known chemical agent for controlling inorganic structures of MgB<SUB>2</SUB> single-crystal material. The utilization of such a gas can also be applied to polycrystalline materials. So far, however, few studies have dealt with the methodology and the effects, especially the structural mechanism. Herein, we have focused on hydrocarbon gas as an active carbon source for bulk and wire materials consisting of MgB<SUB>2</SUB> polycrystals. A starting material, amorphous or crystalline boron powder, was heated and exposed to the molecular gas in argon atmosphere. While the treated powder showed no major change in its structure, as characterized by X-ray diffraction profiles, its usage as a precursor powder for MgB<SUB>2</SUB> bulks resulted in a marked increase in the in-field critical current density. In order to examine and help identify the underlying causes, we have carried out further structural analysis with the Halder Wagner method, considering the integral breadths of peaks in the X-ray diffraction profiles. Finally, the gas treatment was found to improve the in-field transport properties, even for MgB<SUB>2</SUB> wires and densified conductors, which are made from crystalline boron powder.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon-based organic molecular gas can be utilized for MgB<SUB>2</SUB> bulk and wire materials. </LI> <LI> The precursor powder doesn't show major structural change after the gas treatment. </LI> <LI> In contrast, the structural order in MgB<SUB>2</SUB> lattice is lowered by the gas treatment. </LI> <LI> The modified structure leads to enhancement in the in-field transport property. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Maeda, Tetsuhiko,Nakano, Akihiro,Ito, Hiroshi,Motyka, Theodore,Perez-Berrios, Jose M.,Greenway, Scott The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.2
A Totalized Hydrogen Energy Utilization System (THEUS) is proposed for load leveling and stabilizing the grid. The THEUS is a novel unitized regenerative fuel cell system that achieves high overall efficiency through optimized heat utilization. In this paper, a metal hydride tank (MHT) is chosen as hydrogen storage. In the MHT, the heating and cooling from adsorption/desorption processes is used to produced heated and chilled water for building ventilation systems. A new horizontal type MHT was developed to enhance the recovery rate of the reaction heat. This tank has a double coil heat exchanger and contained 50kg of AB5 metal hydride. The experimental results were compared with the results which were developed previously at AIST. The new tank results showed an improvement for the heat recovery rate which is the ratio of recovered energy to the entire reaction heat of the metal hydride. The reaction heat recovery was improved due to the decrease of the thermal capacity of the tank.
Evaluation of Preparation Methods for Scanning Electron Microscopic Observation of Plant Protoplasts
MAEDA,Eizo,SATO,Tadahiko,Oh,Chang Kwon,TANIGUCHI,Takeshi,MIYAKE,Hiroshi 東亞大學校附設遺傳工學硏究所 1996 遺傳工學硏究 Vol.- No.3
佐藤忠彦·權 五昌**·三宅 博·谷口 武·前田英三 (名古屋大學農學部·**韓國東亞大學校農科大學) 要 旨:ペチュニアとイネのプロトプラストを用いて, 走査電子顯微鏡の試料調製法の檢討を行つた. アルコ-ル脫水處理中に生じるプロトプラストの形狀變化を??減するための固定條件を調査した. その結果, 固定條件の違いにより, 脫水處理により生じゐプロトプラストの體積の減少にかなりの差が認められ, グルタルアルデヒド固定, グルタルアルデヒド·オスミウム固定, グルタルアルデヒド·タンニン酸·オスミウム固定の順に, 體積の減少が少なくなつた, グルタルアルデヒド單獨固定の場合に, ペチュニア葉由來プロトプラストの葉綠體の綠色は, アルコ-ル脫水により脫色した. グルタルアルデヒド·タンニン酸·オスミウムで固定すゐと, ペチュニアとイネのプロトプラストの良く保存された走査電子顯微鏡像が得られた. Preparation methods for scanning electron microscopy (SEM) were studied with petunia and rice protoplasts. Fixation schedules to sustain protoplast size during alcohol dehydration were examined. When the different fixations were compared, the decrease in protoplast volume was observed to a variable extent during the dehydration process. The extent of volume decrease was reduced in order of glutaraldehyde, glutaraldehyde-osmium tetroxide, and glutaraldehyde-tannic acid-osmium tetroxide schedules. When fixed only with glutaraldehyde, the green color of the chloroplast in petunia leaf protoplasts was lost during alcohol dehydration. Well-defined scanning electron micrographs of petunia and rice protoplasts were obtained using a glutaraldehyde-tannic acid-osmium tetroxide schedule.
Maeda Yasushi 한국막학회 1996 멤브레인 Vol.6 No.4
In this paper several advantage of RO/NF technologies have been described. However, it should be noted that membrane technology does not solve all the water treatment problems encountered in municipalities. Membranes can provide effective and highly optimized solutions when integrated with conventional technologies such as coagulation, sand filtration, and activated carbon treatments.
Study of Flow Field and Pressure Distribution on a Rotor Blade of HAWT in Yawed Flow Conditions
Maeda, Takao,Kamada, Yasunari,Okada, Naohiro,Suzuki, Jun Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.4
This paper describes the flow field and the blade pressure distribution of a horizontal axis wind turbine in various yawed flow conditions. These measurements were carried out with 2.4m-diameter rotor with pressure sensors and a 2-dimensional laser Doppler velocimeter for each azimuth angle in a wind tunnel. The results show that aerodynamic forces of the blade based on the pressure measurements change according to the local angle of attack during rotation. Therefore the wake of the yawed rotor becomes asymmetric for the rotor axis. Furthermore, the relations between aerodynamic forces and azimuth angles change according to tip speed ratio. By the experimental analysis, the flow field and the aerodynamic forces for each azimuth angle in yawed flow condition were clarified.