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Asahi, H.,Kender, S.,Ikehara, M.,Sakamoto, T.,Takahashi, K.,Ravelo, A.C.,Alvarez Zarikian, C.A.,Khim, B.K.,Leng, M.J. Pergamon Press 2016 Deep-sea research. Part II, Topical studies in oce Vol.125 No.-
A continuous composite oxygen isotope (δ<SUP>18</SUP>O) stratigraphy from benthic foraminifera in the Bering Sea was reconstructed in order to provide insight into understanding sea-ice evolution in response to Northern Hemisphere Glaciation. Oxygen isotope records from multiple species of benthic foraminifera at Integrated Ocean Drilling Program (IODP) Expedition 323 Site U1343 (54<SUP>o</SUP>33.4'N, 176<SUP>o</SUP>49.0'E, water depth 1950m) yield a highly refined orbital-scale age model spanning the last 1.2Ma, and a refined age model between 1.2 and 2.4Ma. An inter-species calibration was used to define species offsets and to successfully obtain a continuous composite benthic δ<SUP>18</SUP>O record, correlated with the global composite benthic δ<SUP>18</SUP>O stack curve LR04 to construct an orbital-scale age model. The consistency of the benthic δ<SUP>18</SUP>O stratigraphy with biostratigraphy and magnetostratigraphy confirms the reliability of both methods for constraining age. The time difference between cyclic changes in sedimentary physical properties and glacial-interglacial cycles since 0.8Ma is notable, and suggests that physical properties alone cannot be used to construct an orbital-scale age model. Amplitude changes in physical properties and a significant drop in the linear sedimentation rate during glacials after 0.9Ma indicate that the glacial sea-ice edge extended beyond the Bering Sea Slope (Site U1343) at this time.
New III-V-based Magnetic Semiconductors and Quantum Nanostructures
H Asahi,M Hashimoto,M Kanamura,R Asano,Y. K. Zhou 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
III-V-based magnetic semiconductors are new functional materials that are expected to lead to the introduction of spin degree-of-freedom for semiconductor devices. This paper describes (1) InMnAsSb/InSb magnetic semiconductor heterostructures and mid-infrared light-induced ferromagnetism, (2) GaN-based magnetic semiconductor GaCrN and high temperature ($>$ 400 K) ferromagnetism and photoluminescence emission, and (3) Mn-including InAs quantum dot structures.
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.
Field electron emission from polycrystalline GaN nanorods
S. Hasegawa,S. Nishida,T. Yamashita,H. Asahi 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.3
We have grown polycrystalline GaN both on polycrystalline Mo sheets and on Si(001) substrates with native oxide by using plasma-assisted molecular beam epitaxy. It has been found that GaN growth on Si(001) with native oxide produces well corientated nanorods exhibiting a low field emission threshold of 1.25 V/μm at 0.1 μA/cm2 and a high emission current density of 2.50 mA/cm2 at an applied electric field of 2.5 V/μm. We will review the growth of polycrystalline GaN films and the evaluation of their structural properties and electron field emission characteristics.