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Numerical Analysis of Drag and Heating Reduction by Directed Energy Air Spike
Sho Sasamoto,Etsuo Morishita 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
It is well known to the aerospace engineering community that aerodynamic drag and heating are extremely critical issues at hyper velocities. Directed Energy Air Spike (DEAS) is a method to deposit a small amount of energy in the flow ahead of a blunt body and to reduce the drag and the heating. The hypersonic flow at M=7 past the blunt body is investigated numerically. The axis-symmetric bodies are studied. The compressible Navier-Stokes Equations are solved by the AUSM-DV scheme. The effects of heat addition and its location are of a particular interest in the present calculation. And the computational results show that optimum amount and location of the heat addition could be determined aerodynamically. The present calculations also confirm that DEAS is a very effective method for the drag and heat transfer reduction at hypersonic speeds.
佐多敏之,笹本忠,李弘林 연세대학교 산업기술연구소 1981 논문집 Vol.13 No.1
MgO single crystal wafers were subjected to vaporization over the temperature range of 1548 to 1928 K in the H₂-H₂O atmospheres. The vapor pressures of Mg over the solid MgO were obtained from the weight losses of MgO, and the weight losses were measured by the transpiration technique. A comparison of the measured vapor pressures of Mg with the theoretical values calculated by the use of themodynamic data concluded that in this experimental condition MgO vapoizes as follows: MgO(s)+H₂(g)=Mg(g)+H₂O(g)
Imanaka, Masaki,Sasamoto, Hideki,Baba, Jumpei,Higa, Naoto,Shimabuku, Masanori,Kamizato, Ryota The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
In remote islands, due to expense of existing generation systems, installation of photovoltaic cells (PVs) and wind turbines has a chance of reducing generation costs. However, in island power systems, even short-term power fluctuations change the frequency of grids because of their small inertia constant. In order to compensate power fluctuations, the authors proposed the power consumption control of pumps which send water to tanks. The power control doesn’t affect water users’ convenience as long as tanks hold water. Based on experimental characteristics of a pump system, this paper shows methods to determine reference power consumption of the system with compensation for short-term PV fluctuations while satisfying water demand. One method uses a PI controller and the other method calculates reference power consumption from water flow reference. Simulations with a PV and a pump system are carried out to find optimum parameters and to compare the methods. Results show that both PI control method and water flow calculation method are useful for satisfying the water demand constraint. The water demand constraint has a little impact to suppression of the short-term power fluctuation in this condition.
Masaki Imanaka,Hideki Sasamoto,Jumpei Baba,Naoto Higa,Masanori Shimabuku,Ryota Kamizato 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
In remote islands, due to expense of existing generation systems, installation of photovoltaic cells (PVs) and wind turbines has a chance of reducing generation costs. However, in island power systems, even short-term power fluctuations change the frequency of grids because of their small inertia constant. In order to compensate power fluctuations, the authors proposed the power consumption control of pumps which send water to tanks. The power control doesn’t affect water users’ convenience as long as tanks hold water. Based on experimental characteristics of a pump system, this paper shows methods to determine reference power consumption of the system with compensation for short-term PV fluctuations while satisfying water demand. One method uses a PI controller and the other method calculates reference power consumption from water flow reference. Simulations with a PV and a pump system are carried out to find optimum parameters and to compare the methods. Results show that both PI control method and water flow calculation method are useful for satisfying the water demand constraint. The water demand constraint has a little impact to suppression of the short-term power fluctuation in this condition.
Sensitive and Mild Fluorogenic Reagents for Biogenic Carboxylic Acids in HPLC
Ushijima, Tamano,Saito, Mikihiko,Sasamoto, Kazumi,Ohkura, Yosuke,Ueno, Keiyu 한국분석과학회 1995 분석과학 Vol.8 No.4
Five acid hydrazides as precolumn fluorescence derivatization reagents for carboxylic acids in HPLC, which have the benzofuran or benzothiazole moiety conjugated to a furan, thiophene or oxazoline ring, were synthesized and examined in view of reactivity, separability and sensitivity. Of these hydrazides, 2-(5-hydrazinocarbonyl-2-oxazolyl)-5,6-dimethoxybenzothiazole (BTOH) was most favorable. The detection limit of lauric acid as a model acid was 0.1 pmol per $10-{\mu}l$ injection volume at S/N=3, which was roughly equal to that of an analogous compound, 2-(5-hydrazinocarbonyl-2-furyl)-5,6-dimethoxybenzothiazole. The reagent allowed rapid assays of carboxylic acids ($C_{12:0}-C_{20:4}$) within 20 min with satisfactory scparability. The method was applied to the determination of fatty acids in human sera from healthy volunteers as well as from patients with diabetes or thyroid dysfunction.
Hasegawa, Ai,Kurita, Asami,Hayashi, Shinji,Fukumoto, Takeshi,Sasamoto, Hamako 한국식물생명공학회 2013 Plant biotechnology reports Vol.7 No.2
The effects of sea salts, NaCl, KCl, $MgCl_2$, $MgSO_4$, and $CaCl_2$, on the growth of protoplast cultures of two mangrove species, Sonneratia alba and Avicennia alba, were investigated using 96-well culture plates. Plants of these two species naturally grow at the seaward side of a mangrove forest. Cotyledon protoplasts of S. alba showed halophilic nature to NaCl, KCl, and $MgCl_2$ at low concentrations (10-50 mM) when cultured in Murashige and Skoog's (MS) medium containing 0.6 M mannitol. $CaCl_2$ at a concentration higher than 25 mM was inhibitory to cell growth. On the other hand, in protoplast culture of A. alba suspension cells, which were induced from cotyledon tissues, in the modified amino acid (mAA) medium containing 1.2 M sorbitol, tolerance to NaCl, $MgCl_2$ and $MgSO_4$ were observed at a wide range of concentrations up to 400 mM. $CaCl_2$ was always inhibitory for cell divisions in A. alba, but stimulatory for spherical enlargement of cells. However, no difference in cell enlargement was observed among other salts. Similarity and difference in reactivity to salts between protoplasts and suspension cells from our previous studies were discussed in relation to the site of salt tolerance or halophilic adaptation within mangrove cells. For protoplast cultures, the site(s) for response of S. alba and A. alba are located in the cytoplasm and/or the cell membrane.
Ai Hasegawa,Asami Kurita,Shinji Hayashi,Takeshi Fukumoto,Hamako Sasamoto 한국식물생명공학회 2013 Plant biotechnology reports Vol.7 No.2
The effects of sea salts, NaCl, KCl, MgCl2,MgSO4, and CaCl2, on the growth of protoplast cultures oftwo mangrove species, Sonneratia alba and Avicenniaalba, were investigated using 96-well culture plates. Plantsof these two species naturally grow at the seaward side of amangrove forest. Cotyledon protoplasts of S. alba showedhalophilic nature to NaCl, KCl, and MgCl2 at low concentrations(10–50 mM) when cultured in Murashige andSkoog’s (MS) medium containing 0.6 M mannitol. CaCl2at a concentration higher than 25 mM was inhibitory to cellgrowth. On the other hand, in protoplast culture of A. albasuspension cells, which were induced from cotyledontissues, in the modified amino acid (mAA) mediumcontaining 1.2 M sorbitol, tolerance to NaCl, MgCl2 andMgSO4 were observed at a wide range of concentrations upto 400 mM. CaCl2 was always inhibitory for cell divisionsin A. alba, but stimulatory for spherical enlargement ofcells. However, no difference in cell enlargement wasobserved among other salts. Similarity and difference inreactivity to salts between protoplasts and suspension cellsfrom our previous studies were discussed in relation to thesite of salt tolerance or halophilic adaptation within mangrovecells. For protoplast cultures, the site(s) for responseof S. alba and A. alba are located in the cytoplasm and/orthe cell membrane.