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Son, S.,Ko, S.K.,Kim, J.W.,Lee, J.K.,Jang, M.,Ryoo, I.J.,Hwang, G.J.,Kwon, M.C.,Shin, K.S.,Futamura, Y.,Hong, Y.S.,Oh, H.,Kim, B.Y.,Ueki, M.,Takahashi, S.,Osada, H.,Jang, J.H.,Ahn, J.S. Pergamon Press 2016 Phytochemistry Vol.122 No.-
Twelve metabolites, including five highly oxygenated azaphilones, geumsanols A-E, along with seven known analogues were isolated from Penicillium sp. KCB11A109, a fungus derived from a ginseng field. Their structures were assigned by spectroscopic means (NMR and MS), and stereochemistries were determined by extensive spectroscopic analyses (<SUP>1</SUP>H-<SUP>1</SUP>H coupling constants, NOESY, and HETLOC) and chemical derivatizations (modified Mosher's method and acetonide formation). The isolates were evaluated for their anticancer, antimicrobial, antimalarial activities, and phenotypic effects in zebrafish development. Of these compounds possessing no pyranoquinone core, only geumsanol E exhibited cytotoxic activities and toxic effects on zebrafish embryos, suggesting that a double bond at C-11 and C-12 is important for biological activity.
Development of a Timberjack-like Pruning Robot
W. Chonnaparamutt,H. Kawasaki,S. Ueki,S. Murakam,K. Koganemaru 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A hybrid novel climbing pruning robot responding the requirement of sustainable forest management is presented. The climbing principal is imitated climbing approach of timberjacks in Japan. Main features include the locating of center of mass of the pruning robot outside of tree and the innovative climbing strategy fusing the straight and spiral climbs. Four active wheels are set at regular intervals around the tree allowing the robot to move along the tree. This novel design provides both lightweight and high climbing speed features of the pruning robot. The development progress of the robot with the experimental results of hybrid climb is reported here. Furthermore, the fuzzy velocity controller is also introduced with a promising experimental result.
ENHANCEMENT OF NOx-PM TRADE-OFF IN A DIESEL ENGINE ADOPTING BIO-ETHANOL AND EGR
S. JUNG,M. ISHIDA,H. UEKI,D. SAKAGUCHI 한국자동차공학회 2010 International journal of automotive technology Vol.11 No.5
−For realizing a premixed charge compression ignition (PCCI) engine, the effects of bio-ethanol blend oil and exhaust gas recirculation (EGR) on PM-NOx trade-off have been investigated in a single cylinder direct injection diesel engine with the compression ratio of 17.8. In the present experiment, the ethanol blend ratio and the EGR ratio were varied focusing on ignition delay, premixed combustion, diffusive combustion, smoke, NOx and the thermal efficiency. Very low levels of 1.5 [g/kWh] NOx and 0.02 [g/kWh] PM, which is close to the 2009 emission standards imposed on heavy duty diesel engines in Japan, were achieved without deterioration of the thermal efficiency in the PCCI engine operated with the 50% ethanol blend fuel and the EGR ratio of 0.2. It is found that this improvement can be achieved by formation of the premixed charge condition resulting from a longer ignition delay. A marked increase in ignition delay is due to blending ethanol with low cetane number and large latent heat, and due to lowering in-cylinder gas temperature on compression stroke based on the EGR. It is noticed that smoke can be reduced even by increasing the EGR ratio under a highly premixed condition.
Control of Ash Deposition in Pulverized Coal Combustion Boilers
( I Naruse ),( R Yoshiie ),( Y Ueki ),( Y Nunomeaan ),( H Naganumac ) 경남대학교 신소재연구소 2012 신소재연구 Vol.24 No.-
This study proposes control technology of ash deposition on the heat exchanger tube in pulverized coal combustion boilers. Thermal spraying technique is adopted to change the surface properties of tube to reduce the ash deposition. As a result, Ni alloy as a thermal spraying material played an effective role to reduce the deposition under both the ash deposition experiments and the actual coal combustion experiments. However, it is necessary to change ash types in order to evaluate that the thermal spraying technology is universally useful or not. If this technology will be applied to the commercialized boilers, additionally, the effectiveness for the long-term will also be studied as well as the theoretical elucidation on the reduction of ash deposition must be discussed. In this study, therefore, four types of coal ash with different melting points were tested as samples for the ash deposition experiments. The long-term ash adhesion experiments were also carried out, using a precise tension tester at high temperature. As the theoretical approaches, the compositions of each ash particle depositing on the tube surface were analyzed by a computer-controlled scanning electron microscope (CCSEM) with electron dispersive spectroscopy (EDS) detector, thereby the interfacial reactions between the ash deposition layer and the heat exchanger tube were discussed. Those results obtained were also compared to the results obtained by the thermal equilibrium calculations. Figures 1 and 2 show a schematic diagram of vertical ash deposition furnace and a precise tension tester at high temperature to measure time change of the adhesion force between a pellet of ash particles and the alloy sample plate. Thermal spraying technique was adopted to change the surface properties of the heat exchanger tubes in the pulverized coal fired boilers for the reduction of ash deposition. First, four types of coal ash with different melting points were tested as samples for the ash deposition experiments. As a result, ash particles with higher fouling factor selectively adhered on the tube surface. Even for the ash particles with lower melting point, Ni alloy as a thermal spraying material played an effective role to reduce the deposition. The reason why the Ni alloy can reduce the ash deposition is to control the formation of molten slag at high temperature. Additionally, the long-term ash adhesion experiments were also carried out, using a precise tension tester at high temperature. The effectiveness of the Ni alloy was also proved even after the long term contact between the ash pellet and the rod thermally sprayed Ni alloy at high temperature. This is because the Ni alloy can control the diffusion of Fe compounds from the tube rod to the ash deposition layer.