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Study on increasing output power density in ECF micropumps
Joon-wan Kim,Seiya Furuki,Shinichi Yokota,Kazuya Edamura 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
Electro-Conjugate Fluid (ECF) is a kind of functional and dielectric fluid. When a high DC voltage is applied to a pair of electrodes immersed in the ECF, a strong and active jet flow of ECF (ECF jet) is generated between these two electrodes. To satisfy high output power and easy fabrication at the same time, triangular prism and slit electrode pairs (TPSEs) for a novel ECF micropump was proposed and developed by MEMS technology based on photolithography with thick photoresist and nickel electroplating. In order to get higher output power density, this study proposes a new approach to efficiently remove dead volume and to increase density of electrodes for ECF jets. High density TPSEs proposed in this research were successfully fabricated by our MEMS technology. ECF micropupmps are realized with a base plate, a silicon rubber sheet, a cover plate and a device chip whose dimensions are 10 mm x 10 mm x 1 mm. Finally, this paper experimentally investigates ECF jet characteristics of the ECF micropumps. The experiment results show that our novel approach to increase output power density for ECF micropump is very effective.
Md. Mahabubur Rahman,Muhammad Nurul Amin,Futoshi Ishiguri,Shinso Yokota,Rubaiyat Sharmin Sultana,Yuya Takashima,Kazuya Iizuka,Nobuo Yoshizawa 한국식물생명공학회 2009 Plant biotechnology reports Vol.3 No.3
A plantlet regeneration protocol was developed on pot-grown mature plants of Elaeocarpus robustus Roxb. cv. Dwarf from nodal and leaf explants. The best yield of adventitious shoots was achieved from the leaf-derived calli in a modified MS (MMS1, half strength of major salts, full strength of minor salts, and vitamins) medium containing 4.0 lM BA ? 4.0 lM Kn ? 0.5 lM NAA ? 15% coconut water (CW). The shoot multiplication rate was amplified about twofold per culture after the addition of 15% CW to the medium. The rate of shoot multiplication reached maximum at the 5th subculture, and it maintained this rate throughout the 3 subsequent subcultures. The best rooting in vitro was investigated by subculturing the microcuttings in an MMS2 (half strength of both major salts and minor salts and full strength of vitamins) medium containing 1.0 lM IBA in the dark for one initial week at 30C, followed by subculturing them in a plant-growth regulator (PGR)-free medium in the light. The plantlets raised in vitro were successfully established under ex vitro conditions. A plantlet regeneration protocol was developed on pot-grown mature plants of Elaeocarpus robustus Roxb. cv. Dwarf from nodal and leaf explants. The best yield of adventitious shoots was achieved from the leaf-derived calli in a modified MS (MMS1, half strength of major salts, full strength of minor salts, and vitamins) medium containing 4.0 lM BA ? 4.0 lM Kn ? 0.5 lM NAA ? 15% coconut water (CW). The shoot multiplication rate was amplified about twofold per culture after the addition of 15% CW to the medium. The rate of shoot multiplication reached maximum at the 5th subculture, and it maintained this rate throughout the 3 subsequent subcultures. The best rooting in vitro was investigated by subculturing the microcuttings in an MMS2 (half strength of both major salts and minor salts and full strength of vitamins) medium containing 1.0 lM IBA in the dark for one initial week at 30C, followed by subculturing them in a plant-growth regulator (PGR)-free medium in the light. The plantlets raised in vitro were successfully established under ex vitro conditions.
Radial variation of bending property in plantation grown Acacia auriculiformis in Bangladesh
Md. Qumruzzaman Chowdhury,Nobuo Yoshizawa,Futoshi Ishiguri,Tokiko Hiraiwa,Yuya Takashima,Kazuya Iizuka,Shinso Yokota 한국산림과학회 2012 Forest Science And Technology Vol.8 No.3
Acacia auriculiformis is one of the major fast-growing plantation species in Bangladesh. Understanding the radial variation of bending property has importance in tree improvement and wood utilization. In this study, the radial variation of modulus of elasticity (MOE) and modulus of rupture (MOR) in static bending were examined in 11-year-old plantation-grown Acacia auriculiformis from Bangladesh. MOE and MOR increased up to about 6 and 8 cm radial distance from the pith, respectively, and then both properties were nearly stable toward the bark. MOE did not show significant correlation with air-dried density. Conversely, MOR showed significant correlation with airdried density. Significant variation among the trees indicates that the air-dried density and MOR could be used in plus tree selection for wood quality improvement of this species through tree breeding.
Agung Prasetyo,Ryota Endo,Yuya Takashima,Haruna Aiso,Fanny Hidayati,Jun Tanabe,Futoshi Ishiguri,Kazuya Iizuka,Shinso Yokota 강원대학교 산림과학연구소 2015 Journal of Forest Science Vol.31 No.3
Zelkova serrata is an important hardwood species for the timber industry in Japan. Tree breeding programs for this species have mainly focused on growth characteristics such as stem diameter (D), tree height (TH), stem form, and branching. In order to fulfill timber industry needs, wood quality improvement should be included in the tree breeding program of this species. In the present study, growth characteristics, such as D and TH, and the stress- wave velocity (SWV), which is highly correlated with Young’s modulus of wood, were measured for 20-year-old Z. serrata from eight half-sib families planted in a progeny test site with three different initial spacings. Significant differences in all the measured characteristics were found among the eight half-sib families. The variance components of the half-sib families for D, TH, and SWV were 27.2%, 47.3%, and 33.5%, respectively. These results indicate that all the measured characteristics of this species could be improved by tree breeding programs. In addition, only low correlation coefficients were obtained between the growth characteristics and SWV, indicating that extensive selection on SWV in tree breeding programs may not always lead to a reduction in yield volume.
Prasetyo, Agung,Endo, Ryota,Takashima, Yuya,Aiso, Haruna,Hidayati, Fanny,Tanabe, Jun,Ishiguri, Futoshi,Iizuka, Kazuya,Yokota, Shinso Institute of Forest Science 2015 Journal of Forest Science Vol.31 No.3
Zelkova serrata is an important hardwood species for the timber industry in Japan. Tree breeding programs for this species have mainly focused on growth characteristics such as stem diameter (D), tree height (TH), stem form, and branching. In order to fulfill timber industry needs, wood quality improvement should be included in the tree breeding program of this species. In the present study, growth characteristics, such as D and TH, and the stress-wave velocity (SWV), which is highly correlated with Young's modulus of wood, were measured for 20-year-old Z. serrata from eight half-sib families planted in a progeny test site with three different initial spacings. Significant differences in all the measured characteristics were found among the eight half-sib families. The variance components of the half-sib families for D, TH, and SWV were 27.2%, 47.3%, and 33.5%, respectively. These results indicate that all the measured characteristics of this species could be improved by tree breeding programs. In addition, only low correlation coefficients were obtained between the growth characteristics and SWV, indicating that extensive selection on SWV in tree breeding programs may not always lead to a reduction in yield volume.