Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Matsunami, Noriaki*; Ito, M.*; Kato, M.*; Okayasu, Satoru; Sataka, Masao*; Kakiuchida, Hiroshi*
Nuclear Instruments and Methods in Physics Research B, 365(Part A), p.191 - 195, 2015/12
Times Cited Count：6 Percentile：45.92(Instruments & Instrumentation)We have studied ion impact effects on atomic structure in terms of X-ray diffraction (XRD), optical absorption and electrical resistivity of Mn (6%)-doped ZnO films under 100 MeV Xe ion impact at room temperature. We find the monotonic reduction of the XRD intensity to 1/50 of that of unirradiated film at 5 
10
cm
, little bandgap change (
0.02 eV) and decrease of the resistivity by 4 order of magnitude. The resistivity modification has been compared with that by irradiations of low energy ions such as 100 keV Ne and N, which show more effective decrease of resistivity. We also find that temperature (T) dependence of the magnetic susceptibility (
) of Mn-doped ZnO follows the Curie law: = 
+ C/T (i.e., paramagnetic) and the Curie constant C decreases to a half of that before irradiation (C
= 0.012 emu cm
K) at 100 MeV Xe ion fluence of 10
cm.
Okamura, Hiroki*; Tsuchida, Takashi*; Okada, Masao*; Yamagata, Ryohei; Seito, Hajime; Haruyama, Yasuyuki; Kaneko, Hirohisa
2011 Nen (Dai-29-Kai) Denki Setsubi Gakkai Zenkoku Taikai Koen Rombunshu, p.367 - 368, 2011/09
no abstracts in English
Matsunami, Noriaki*; Fukushima, Junichi*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Kakiuchida, Hiroshi*
Nuclear Instruments and Methods in Physics Research B, 268(19), p.3071 - 3075, 2010/10
Times Cited Count：13 Percentile：65.22(Instruments & Instrumentation)no abstracts in English
Matsunami, Noriaki*; Sataka, Masao*; Okayasu, Satoru; Kakiuchida, Hiroshi*
Nuclear Instruments and Methods in Physics Research B, 268(19), p.3167 - 3170, 2010/10
Times Cited Count：13 Percentile：65.22(Instruments & Instrumentation)We have studied electronic- and atomic-structure modifications of polycrystalline WO
films (bandgap of 
3 eV) by ion irradiation. WO films were prepared by oxidation of W films on MgO substrates and of W sheets. We find disordering or amorphization, the lattice expansion of 1.5% and bandgap increase of 0.2 eV after 90 MeV Ni ion irradiation at 3 10 cm
. A broad peak of optical absorption appears around 1.6 
m by ion irradiation. We also find that the erosion yield by high-energy ions with the equilibrium charge exceeds 10
and that the erosion yield under ion impact with non-equilibrium charge (90 MeV Ni
) is 1/5 of that with the equilibrium charge (89 MeV Ni
). Effects of depth dependence of the ion mean charge on the erosion yields are discussed. The erosion yield by low-energy ions is also presented.
C values of organic matter in surface sediments off Saru River in northern Japan, one year after a flood event in 2006Nagao, Seiya*; Irino, Tomohisa*; Aramaki, Takafumi*; Ikehara, Ken*; Katayama, Hajime*; Otosaka, Shigeyoshi; Uchida, Masao*; Shibata, Yasuyuki*
Radiocarbon, 52(3), p.1068 - 1077, 2010/08
Times Cited Count：0 Percentile：0.01(Geochemistry & Geophysics)This study discusses the effects of flooding on the spatial distribution of organic matter on the shelf region of off the Saru River, southern part of Hokkaido, Japan, on the basis of the C and 
C values. Surface sediments on the shelf were collected in August 2007, one year after the severe flood in 2006. Suspended particles and sediment of the Saru River were also collected in August 2007 and 2008. The C values of organic matter in the shelf sediments ranged from -665 to -77 per mil. The silt and clay sediments had C values of -240 to -77 per mil, but the sandy sediments ranged from -665 to -388 per mil. The values of particulate organic carbon in the Saru River are -292 to -247 per mil at normal flow conditions. These results indicate that surface soil with relatively older organic matter is deposited on the shelf region by the flooding event, and freshly-produced organic matter in sea surface is deposited after the flooding.
Mugibayashi, Yasuhiro*; Arimura, Juro*; Uchida, Toshihito*; Machiyama, Tomoaki*; Suzuki, Yoshio*; Seko, Noriaki; Tamada, Masao
JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 41, 2008/11
no abstracts in English
Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Ishikawa, Norito; Tazawa, Masato*; Kakiuchida, Hiroshi*
Nuclear Instruments and Methods in Physics Research B, 266(12-13), p.2986 - 2989, 2008/06
Times Cited Count：8 Percentile：50.37(Instruments & Instrumentation)Irradiation effects of Cu
O irradiated with 100 MeV Xe ions were studied. X-ray diffraction intensity and optical properties were analyzed.
Iguchi, Yusuke*; Shibata, Yasuhiro*; Uchida, Yuta*; Huang, X.*; Ono, Masao; Okayasu, Satoru; Mashimo, Tsutomu
Advanced Materials Research, 15-17, p.639 - 642, 2007/00
Times Cited Count：2 Percentile：59.68(Thermodynamics)In this study, we investigate the crystalline states and conditions for the grain-refinement of Bi
Sb
alloy. It was considered under an ultra strong gravity field, the crystals were fine-grained from the primary grain sizes of several mm to several tens of mm, and the crystal growth followed with formation of graded-composition structure due to sedimentation of atoms along the direction of gravity. It was found that for the crystal-grain refinement in BiSb alloy the minimum gravitational field and the minimum time duration were at least 160,000 G and 10 hours, respectively at about 200 
C.
/4H-SiC(0001) interfaceYamashita, Kenya*; Kitabatake, Makoto*; Kusumoto, Osamu*; Takahashi, Kunimasa*; Uchida, Masao*; Miyanaga, Ryoko*; Ito, Hisayoshi; Yoshikawa, Masahito
Materials Science Forum, 389-393, p.1037 - 1040, 2002/00
Times Cited Count：3 Percentile：16.11(Materials Science, Multidisciplinary)no abstracts in English
N films and phase separationMatsunami, Noriaki*; Kakiuchida, Hiroshi*; Tazawa, Masato*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki
no journal, ,
no abstracts in English
Nagao, Seiya*; Aramaki, Takafumi*; Irino, Tomohisa*; Uchida, Masao*; Shibata, Yasuyuki*; Togawa, Orihiko
no journal, ,
no abstracts in English
Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Kakiuchida, Hiroshi*
no journal, ,
no abstracts in English
Matsunami, Noriaki*; Fukushima, Jun*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Kakiuchida, Hiroshi*
no journal, ,
no abstracts in English
Matsunami, Noriaki*; Sakuma, Yasuhiro*; Sataka, Masao; Okayasu, Satoru; Kakiuchida, Hiroshi*
no journal, ,
no abstracts in English
