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표고골목 해균인 주홍꼬리버섯을 방제하기 위한 저항성 표고균주 선발
이봉훈,박원철,가강현,윤갑희,박현,차병진 한국버섯학회 2005 한국버섯학회지 Vol.3 No.3
Attempts were made to control Diatrype stigma occurred on the bed-log of shiitake by resistant shiitake strains. In selection test of resistant shiitake strains, 67 out of 77 strains tested were proved to be resistant to D. stigma. Among them, 13 strains including KFRI 5 were effective to inhibit the access of D. stigma, and 7 strains including KFRI 180 remarkably invaded the territory of D. stigma. Among 31 shiitake strains made by hybridization of resistant strains for D. stigma, 8 strains including KFRI 537 inhibited the access of D. stigma, and 4 strains including KFRI 545 invaded the territory of D. stigma. The effects of temperatures and inoculation orders to the resistance were confirmed in PDA plates and test tubes filled with sawdust of Quercus acutissima. Four kinds of temperature treatments as follows were tested: ① continuous incubation at 14℃, ② continuous incubation at 25℃, ③ changing of incubation temperature from 14℃ to 25 ℃ as soon as mycelia of both shiitake and D. stigma meet together, ④ changing of incubation temperature from 25℃ to 14 ℃ as soon as mycelia of both shiitake and D. stigma meet together. Three kinds of inoculation procedure were tested: ① inoculation of shiitake 3 days ahead of D. stigma inoculation, ② inoculation of D. stigma 3 days ahead of shiitake inoculation, ③ simultaneous inoculation of both fungi. In PDA plate test, the strain KFRI 137 showed outstanding ability to inhibit mycelial growth of D. stigma and the strain KFRI 180 invaded into the territory of D. stigma in most of treatments. Hybrid strains, KFRI 545, 546, and 547 were more resistant than their parent strains, KFRI 488 and 405. In test tube examinations, all the strains of shiitake showed high resistance at the treatment of change in temperature from 14℃ to 25℃ when mycelia of both shiitake and D. stigma meet together. On the other hand, resistance of all the strains growing at 25℃ decreased when the temperature was changed into 14℃ after mycelia of both fungi. In these cases, the resistance reached to 7∼20% of the highest resistance. The strain KFRI 259 invaded the territory of D. stigma, contrary to PDA plate test. Among the strains, KFRI 393 strain was the most resistant under the continuous incubation at 25℃.
A12024-T4의 프레팅 피로균열거동에 관한 실험적 연구
이봉훈,이순복,Lee, Bong-Hun,Lee, Sun-Bok 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
The technique of fretting fatigue test was developed and fretting fatigue tests of A12024-T4 were conducted under several conditions. The newly developed calibration methods for measuring surface contact tractions showed good linearity and repeatability. The plate type specimen to which tow bridge type pads were attached and vision system was used to observe the crack behaviour. The oblieque cracks appeared in the early stage of crack growth and they became mode I cracks as they grow about 1 mm. The mode I transition points were found to be longer when surface tractions are higher or bulk stress is lower. Before the crack becomes mode I crack, 'well point' where crack grow about rate is minimum, was detected under every experimental condition. The crack behaviour was found to be affected by surface tractions, contact area, bulk stress. It was also found that partial slip and stick condition is most detrimental and the crack starts from the boundary of stick and slip. For gross slip crack started at the outside edge of pad. After crack mode transition, fretting fatigue cracks showed almost same behaviour of plain mode I fatigue cracks. Equivalent stress intensity factor was used to analyze the behaviour of fretting fatigue cracks and it was found that stress intensity factors can be applied to fretting fatigue cracks.