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RISS 인기검색어
- 검색키워드
- 저자 : Y. Kanematsu (검색결과 5 건)
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Kanematsu, Y.,Takahashi, K.,Kim, S.,Asahi, H.,Khim, B.K. Pergamon Press 2013 Quaternary international Vol.310 No.-
Sediments from three Sites (U1341, U1343 and U1345) of IODP Expedition 323, located in the Bering Sea, were analyzed for variation of biogenic opal representing surface water paleoproductivity. Initial age models of three Sites (bottom age, U1341: 4.3 Ma, U1343: 2.4 Ma, U1345: 0.5 Ma) were established onboard by biostratigraphic and paleomagnetic investigations. The initial age models were tuned by δ<SUP>18</SUP>O stratigraphy, which was established on shore. Biogenic opal contents of sediments were analyzed for the interval of 1.3 Ma to the present. Generally, the %biogenic opal values at Site U1341 (Bowers Ridge) were significantly higher than those at the Beringian slope sites (U1343 and U1345). Higher natural gamma radiation (NGR) counts and magnetic susceptibility (MS) at the Beringian slope sites suggested a greater contribution of lithogenic matter than at Site U1341 on Bowers Ridge. The percentages of sea-ice diatoms at the Beringian slope sites are also higher than those at Bowers Ridge Sites. This is primarily attributed to the fact that the sediments from the Beringian slope area were significantly diluted by lithogenic matter derived from the Alaskan continent, and were largely affected by sea-ice cover. The cyclicity of biogenic opal accumulation rates at Site U1341 is determined to be about 160, 40, and 30 ky, whereas that at Site U1343 is determined to be about 330, 100, 40 and 20 ky. If these had been reflecting a global climate change, the cyclicity of biogenic opal contents at all sites would be consistently the same. However, the results do not show such a consistency. Obliquity is observed at both sites of the Bowers Ridge and Beringian slope. A strong eccentricity was observed only at U1343, but no signature for eccentricity was detected at U1341. Therefore, the Milankovitch cycle with 100 ky periodicity was only observed at the Beringian slope area. The results suggest that the %biogenic opal at Site U1341 indicated a local characteristic for biogenic productivity changes. Thus, the absence of the 100 ky cycle of biogenic opal at Site U1341 seems to be due to local phenomena such as water circulation, although the changes in biogenic opal productivity at Site U1341 are attributed to summer insolation.
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Effect of aggregate on residual mechanical properties of heated ultra-high-strength concrete
Kim, Y. S.,Ohmiya, Y.,Kanematsu, M.,Kim, G. Y. Rilem Publications 2016 Materials and Structures Vol.49 No.9
<P>When concrete structures are exposed to fire temperatures, their internal structure will change, and then the service life of the structure will decrease due to the deterioration of its strength and deformation capacity. The deterioration level will depend on the temperature reached, exposure time, mix proportions of the concrete, aggregate property and the material's own characteristics. This study was carried out to evaluate the influence of water to cement ratio, fine-grained aggregate to aggregate ratio and maximum size of aggregate on the thermal behavior of ultra-high-strength concrete. At room temperature and 500 degrees C the tests for compressive strength, static modulus of elasticity, ultrasonic pulse velocity, dynamic modulus of elasticity and weight loss were measured using the cylindrical specimens of empty set100 9 200 mm. The test data indicated that the fine-grained aggregate to aggregate ratio and the maximum size of aggregate have a significant influence on the residual mechanical properties of ultra-high strength concrete. And by measuring the ultrasonic pulse velocity of the ultra-high-strength concrete specimens, it was confirmed in this study that predicting the residual compressive strength is a distinct possibility.</P>
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Resonance Fluorescence Spectra of Zn-Substituted Myoglobin
안정선,C.H. Shin,H.M. Kim,J.O. Cha,여승준,Y. Kanematsu,Y. Nishikawa 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6
Laser-induced fluorescence spectra, including narrow resonance lines, were measured for Zn-substituted myoglobin (ZnMb) in the lowest optical absorption band at 4 K by using a combination of short light pulses from a CW mode-locked laser for the excitation and a time-correlated single-photon counting method for the detection. The site-energy distribution function, {\it i.e.}, the distribution of the number of chromophore at various sites as a function of the zero-phonon transition energy, was determined from the excitation profile of the narrow resonance fluorescence line. The single-site fluorescence spectrum was determined by use of the saturation effect of laser-induced fluorescence. By comparing the laser-induced fluorescence spectra and the absorption spectrum with the spectra calculated by using the experimentally determined site-energy distribution and single-site fluorescence spectra, we found that the coupling between the electrons of the chromophore and the vibrations of the polypeptide was quite weak. Furthermore, the density of states of vibrational modes of myoglobin weighted by the coupling strength between the chromophore and the polypeptide chain was determined from the single-site fluorescence spectrum by solving an integral equation numerically
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