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Atsushi Kasai,Koji Yamashita,Yutaka Yoshiyasu 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.2
We examined the temperature-dependent development, adult longevity, fertility, and sex ratio of the whitefly Aleurocanthus camelliae, which infests tea plants, under laboratory conditions. Eggs and nymphs were reared on tea shoots at 20, 22.5, 25, and 27.5 °C with a photoperiod of 15L:9D. The developmental zero of the egg, total nymphal stadia, and egg–adult duration of A. camelliae were 12.6, 11.6, and 11.9 °C, respectively,with thermal constants of 176.7, 394.7, and 569.9 d-degrees, respectively. The mean longevities of adult female and male A. camelliae were 4.4 and 2.7 d, respectively. These results suggested A. camelliae voltinism of two to three generations per year in Kanto, Tokai, and Kinki districts and three to five generations per year in the Shikoku and Kyushu districts, Japan.
Monitoring of a CFRP-Stiffened Panel Manufactured by VaRTM Using Fiber-Optic Sensors
Takeda, Shin-Ichi,Mizutani, Tadahito,Nishi, Takafumi,Uota, Naoki,Hirano, Yoshiyasu,Iwahori, Yutaka,Nagao, Yosuke,Takeda, Nobuo The Korean Society for Composite Materials 2008 Advanced composite materials Vol.17 No.2
FBG (Fiber Bragg Grating) sensors and optical fibers were embedded into CFRP dry preforms before resin impregnation in VaRTM (Vacuum-assisted Resin Transfer Molding). The embedding location was the interface between the skin and the stringer in a CFRP-stiffened panel. The reflection spectra of the FBG sensors monitored the strain and temperature changes during all the molding processes. The internal residual strains of the CFRP panel could be evaluated during both the curing time and the post-curing time. The temperature changes indicated the differences between the dry preform and the outside of the vacuum bagging. After the molding, four-point bending was applied to the panel for the verification of its structural integrity and the sensor capabilities. The optical fibers were then used for the newly-developed PPP-BOTDA (Pulse-PrePump Brillouin Optical Time Domain Analysis) system. The long-range distributed strain and temperature can be measured by this system, whose spatial resolution is 100 mm. The strain changes from the FBGs and the PPP-BOTDA agreed well with those from the conventional strain gages and FE analysis in the CFRP panel. Therefore, the fiber-optic sensors and its system were very effective for the evaluation of the VaRTM composite structures.