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Tsujita, Shinsuke,Shinji, Takao,Oyama, Tsutomu,Tsuji, Takao The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.3
Electric power systems, which include many renewable energy resources for worldwide low-carbon path, have a lot of problems and many studies are made for its solutions. Co-generation systems which consist of gas engine etc. have also been expected to make low-carbon path come true. One of difference between gas engines and renewable energy resources is their controllability. In this study, the operating reserve is considered as the ancillary service from distributed generator side. We have considered whether distributed generators are able to alternative thermal power plant when the peak demands. As the result, we have realized the generating cost of distributed generator possible to able to reduce against existing thermal power plant.
Design and Prototyping Micro Centrifugal Compressor for Ultra Micro Gas Turbine
Hirano, Toshiyuki,Tsujita, Hoshio,Gu, Ronglei,Minorikawa, Gaku Korean Society for Fluid machinery 2009 International journal of fluid machinery and syste Vol.2 No.4
In order to investigate the design method for a micro centrifugal compressor, which is the most important component of an ultra micro gas turbine, an impeller having the outer diameter of 20mm was designed, manufactured and tested. The designed rotational speed is 500,000 rpm and the impeller has a fully 3-dimensional shape. The impeller was rotated at 250,000 rpm in the present study. The experimental results of the tested compressor with the vaned and the vaneless diffusers were compared. It was found that the vaned diffuser attained the higher flow rate than the vaneless diffuser at the maximum pressure ratio. In addition the maximum pressure ratio was higher for the diffuser having a larger diffuser divergence angle at the high flow rate. These results were compared with those obtained by the prediction method used at the design stage.
Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes
Ura, Yasuyuki,Tsujita, Hiroshi,Mitsudo, Take-Aki,Kondo, Teruyuki Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(η6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetrahydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(η4-cod)(η6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(η6-cot)(η2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(η6-cot)(η2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(η6-cot)(η2-dmfm)2 catalyst in the presence of primary alcohols.
Antihypertensive and Antihyperlipemic Actions of Chitosan
Okuda, Hiromichi,Kato, Hideo,Tsujita, Takahiro 한국키틴키토산학회 1997 한국키틴키토산학회지 Vol.2 No.3
The effect of dietary fibers on the hypertensive action of NaCl was examined by administration of a high salt diet containing alginic acid, which readily absorbs cations or chitosan, which readily absorbs anions, to normotensive rats and SHRSP (Stroke-prone spontaneously hypertensive rats) for 40 days. Addition of alginic acid to the high salt diet increased the amount of sodium and the addition of chitosan increased the amount of chloride in the feces of normotensive rats. Addition of chitosan to the high salt diet resulted in a significantly lower systolic blood pressure than addition of alginic acid in both groups. Serum ACE(angiotensin converting enzyme)was significantly reduced in SHRSP fed with the high salt diet containing chitosan. Serum chloride ion was lower in the normotensive rats fed with the high salt diet containing chitosan than alginic acid. In humans, the high salt diet increased the systolic blood pressure and serum ACE activity and chloride concentration after 1 h and oral administration of chitosan inhibited these increases. It also reduced the serum bicarbonate level after 1 h, but did not affect the sodium concentration. Serum ACE in humans was found to be stimulated by chloride ion. These results suggest that chitosan prevents increase in the systolic blood pressure of humans induced by high salt intake by inhibiting intestinal absorption of chloride, an activator of ACE. Based on these results, the relationship between serum ACE and chloride concentration was discussed. Chitosan was found to inhibit strongly hydrolysis of triolein emulsified with soybean phosphatidylcholine by pancreatic lipases at its dose of 10yg/ml. Chitosan, however, failed to inhibit the hydrolysis of triolein emulsified with gum arabic. In vivo, oral administration of chitosan to rats reduced the plasma triglyceride concentration. Based on these results, antihyperlipemic action of chitosan was discussed.
Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes
Yasuyuki Ura,Hiroshi Tsujita,Take-aki Mitsudo,Teruyuki Kondo* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.12
Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(h6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetra-hydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(h4-cod)(h6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(h6-cot)(h2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(h6-cot)(h2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(h6-cot)(h2-dmfm)2 catalyst in the presence of primary alcohols.
Numerical Analysis of Flow in Radial Turbine (Effects of Nozzle Vane Angle on Internal Flow)
OTSUKA, Kenta,KOMATSU, Tomoya,TSUJITA, Hoshio,YAMAGUCHI, Satoshi,YAMAGATA, Akihiro Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.2
Variable Geometry System (VGS) is widely applied to the nozzle vane for the radial inflow turbine constituting automotive turbochargers for the purpose of optimizing the power output at each operating condition. In order to improve the performance of radial turbines with VGS, it is necessary to clarify the influences of the setting angle of nozzle vane on the internal flow of radial turbine. However, the experimental measurements are considered to be difficult for the flow in radial turbines because of the small size and the high rotational speed. In the present study, the numerical calculations were carried out for the flow in the radial turbine at three operating conditions by applying the corresponding nozzle vane exit angles, which were set up in the experimental study, as the inlet boundary condition. The numerical results revealed the characteristic flow behaviors at each operating condition.