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담수어의 (淡水魚) 지리적 집단간의 수용성 근단백 분획에 대하여 (1)
김지식,전상린 ( Ji Sik Kim,Sang Rin Jeon ) 한국하천호수학회 1981 생태와 환경 Vol.14 No.1·2
To study the difference of aqueous soluble muscle protein pattern of fresh-water fishes in geographical populations the method of disc-electrophoresis using polyacrylamide was adapted. 1) The number of bands of aqueous soluble muscle protein were 10 in Zacco platypus, 7 in Zacco temmincki, 6 in Pungtungia herzi, 7 in Pseudopungtungia tenuiscorpus, 5 in Rhodus ocellatus, 8 in Coreoleuciscus splendidus, 9 in Microphysogobio longidorsalis. 2) The number of bands, degree of stain, mobility and rate of contents were different in interspecies. 3) No electrophoretic pattern was observed different among the four locality.
압광 페인트를 이용한 MgO 안정화 지르코니아 소재의 급작스러운 파괴거동에 관한 실시간적 관찰연구
김지식 ( Ji Sik Kim ),손기선 ( Kee Sun Sohn ),고향진 ( Hyang Jin Koh ),이완두 ( Wan Boo Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 대한금속·재료학회지 Vol.45 No.5
The recently devlopoped ML(Mechano-Luminescence) technique enables macro-scale visualization of crack propagation during catastrophic failure, together with transformation zone (crack wake) in both crack front and side areas of Mg-PSZ in realistic time frame. The ML made it possible to precisely detect a relatively fast crack propagating in the speed range from 5 to 15 m/sec, thereby realizing so-called quasi-dynamic R-curve. A systematic observation of growth in wake height, as well as wake length, was made successfully in quasi-dynamic condition. Effective-toughening applied-stress intensity factor increased up to 22 MPa(m)(1/2). The h0 values obtained from the ML observation deviated significantly from that predicted by Evans-McMeeking model(J. Am. Ceram. Soc. 65,242(1982)); rahter it supports Marshall et al.`s results by interference microscopy and Raman spectroscopy (J Am. Ceram. Soc. 73,2659(1990)) in the quasi-static crack propagation. It was also mentioned that conventional R-curves spanning over several millimeters range reported for long-crack systems such as DCB(Double Cantilever Beam), CT(Compact Tension), SENB(Single Edged Notched Bar), and etc. can not be explained by Evans-McMeeking model.
SrAl₂O₄: (Eu, Dy, Nd) 압광체를 이용한 균열 전파 및 브리징 응력의 가시화 연구
김지식,권용남,손기선 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.8
The goal of the present investigation was to visualize the propagating crack in a mechano-luminescence (ML) material to enable the measurement of instantaneous R-curves and directly observe the bridging (shielding) stress in a fast-propagating crack system. The well-known ML compound, SrAl₂O₄: Eu^(2+), was used as a model test material. Two additional trivalent rare earth elements, Dy and Nd, were introduced as co-dopants to improve the luminescent efficiency. The initiation and growth of a crack from the mechanically machined sharp notch tip in a disc shaped compact tension (CT) specimen at a relatively high loading rate were found to be associated with the extent of light emission around the crack. An in-situ measurement of crack length and applied load for 0.3 sec yielded an instantaneous R-curve at the conventional crack propagation speed.
金知植,李在祥,周雄龍 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.4
A study has been made to investigate the effects of various oxide particles on the nucleation and growth during strain induced dynamic transformation(SIDT) in Ti and Mg added steels. Compression tests have been carried out for steels with fine(20 ㎛), medium(90 ㎛) and coarse austenite(200 ㎛) microstructures at 750, 700 and 650℃ at a strain rate of 1s^-1. After the tests, specimens were water quenched and analyzed by OM, SEM and TEM. The results showed that the ferrite nucleation during SIDT was enhanced by Ti and Mg oxide particles as well as prior austenite boundaries via providing nucleation sites. On the other hand, the growth rate of ferrite formed by SIDT seemed to be more closely related with carbon in steel.
조간대의 (潮間帶) 저서동물의 (底棲動物) 섭식행위가 (攝食行爲) 저질토 (底質土) 환경에 미치는 영향
김지식 ( Chi Shik Kim ) 한국하천호수학회 1986 생태와 환경 Vol.19 No.1·2
This experimental study was conducted to investigate how deposit-feeding Glycera decipiens and suspension-feeding Lingula unguis being macrobenthos affects the substratum of intertidal flat from July 10, 1985 to October 17, 1985. This study proved that organic matter reduced rapidly owing to deposition in the benthos-unliving environment and that the deposit-feeder restrains the reduction of the substratum more than the suspension-feeder; namely, the feeding behavior and movements of benthic animals increased the oxidation-reduction potentials of the substratum. On the other hand, it appeared that these benthic animals had little effect on the pH of the substratum. The distributional differences of fine particles come from the feeding behavior of benthic animals and Glycera decipiens promote the sandification of the substratum. The analytic values of total organic matter and total nitrogen matter appeared to be similar and Glycera decipiens promoted the denitrification of the substratum.
수종 담수어간의 (淡水魚間) 근단백 전기영동 분획의 유사성에 관한 연구
김지식 ( Ji Sik Kim ) 한국하천호수학회 1981 생태와 환경 Vol.14 No.1·2
Soluble muscle protein extracted from 9 species fresh water fish was electroph oresised with polyacrylamide gel. The percentage similarity from the electrophoresis band pattern are as followes; 1. The average percentage similarity of Microphysogobio koreensis, M. yaluensis, M. longidorsalis which belong to the same genus of Gobiobotinae appe-ared to be 81%. 2. The average percentage similarity of Hemibarbus longirostris, Gonoproktopterus mylodon and Pseudogobio esocinus which are of different genus but of similar morphological feature appeared to be 78%. 3. The average similarity of Pungtungia herzi, Pseudopungtungia tenuicorpus, Coreleucisus splendidus which are of different genus and of relatively different morphological feature represented 72%. 4. From the above-mentioned 9 species, the percentage similarity of species which is pertained to the same genus is higher than that the percentage similarity of the species with similar morphological feature in defferent genuses of the same family is a little higher of different genuses than that of species which has different morphological features.