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Shibata, Hitoshi,Tanaka, Tomoyuki,Yonemura, Takeshi,Sawa, Yoshihiro,Ishikawa, Takahiro Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Since solar radiation contains wavelength essential for photosynthesis accompanying with near-UV light, UV-B effects on biological parameters and acclimation mechanisms are influenced by photosynthetically active radiation (PAR). Therefore, to elucidate near-UV shielding mechanism in higher plants, we cultivated cauliflower under usual solar radiation and increased UV-B from fluorescent lamps, two- or three-fold excess over continuously estimated UV-B dose in PAR during daytime, using computer regulated systems. Increased UV-B radiation had little effect on growth expressed as fresh weigh and leaf area. Water soluble low molecular weight compounds showing absorption in near UV region were enhanced according to the irradiated UV-B dose. One of compounds in cauliflower leaves was identified as chlorogenic acid. This was found to have no near-UV photosenSitizerable activity and is known to have an ability to scavenge a wide species of active oxygen. Another pro-oxidant compound that generates superoxide anion radical under near-UV irradiation was not induced by increased UV-B during cultivation, and identified as lumazine, a degradation product from folic acid.
Contact Constraint Representation in an Assembly Using Configuration Space
Tokunaga, Hitoshi,Tanaka, Fumiki,Kishinami, Takeshi 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
In order to represent an assembly whose components have a degree of freedom (for example, kinematic mechanism), a method for deriving the position and orientation of each component in the assemlbly from the contact constraints of its geometrical elements is required. In this paper, an assembly model which represents an assembly whose components have a degree of freedom is proposed. First, a contact constraint representation between any two specific geometrical elements of two components in configuration space is introduced. Secondly, an expansion of this representation to that of a multiple component assembly is proposed. Thirdly, the representation of the relation of constraints in configuration space is proposed to represent the assembly. Finally, based on these representations, a method for deriving the region for the position and orientation of the components in an assembly is proposed.
Effects of Strong Wind and Ozone on Localized Tree Decline in the Tanzawa Mountains of Japan
Suto, Hitoshi,Hattori, Yasuo,Tanaka, Nobukazu,Kohno, Yoshihisa Korean Society for Atmospheric Environment 2008 Asian Journal of Atmospheric Environment (AJAE) Vol.2 No.2
The numerical simulation of wind and ozone ($O_3$) transport in mountainous regions was performed with a computational fluid dynamics technique. A dry deposition model for $O_3$ was designed to estimate $O_3$ deposition in complex terrain, and the qualitative validity of the predicted $O_3$ concentration field was confirmed by comparison with observed data collected with passive samplers. The simulation revealed that wind velocity increases around ridge lines and peaks of mountains. The areas with strong wind corresponded well with the sites of tree decline at high altitudes, suggesting that it is an important factor in the localization of tree/forest decline. On the other hand, there is no direct relationship between forest decline and $O_3$ concentration. The $O_3$ concentration, however, tends to increase as wind velocity becomes higher, thus the $O_3$ concentration itself may be a potential secondary factor in the localized decline phenomena. While the diffusion flux of $O_3$ is not related to localized tree decline, the pattern of advection flux is related to those of high wind velocity and localized tree decline. These results suggest that strong wind with large advection flux of $O_3$ may play a key role in the promotion of tree/forest decline at high mountain ridges and peaks.