A5102026968- Thin-Film Transistor Technologies
- Silicon Nanostructures and Photoluminescence
- Silicon and Solar Cell Technologies
- Geology and Paleoclimatology Research
- Nuclear and radioactivity studies
- Radioactive contamination and transfer
- Semiconductor materials and devices
- Geological formations and processes
- Quantum and electron transport phenomena
- Theoretical and Computational Physics
- Methane Hydrates and Related Phenomena
- Semiconductor materials and interfaces
- earthquake and tectonic studies
- Transition Metal Oxide Nanomaterials
- Geochemistry and Geologic Mapping
- Graphite, nuclear technology, radiation studies
- Isotope Analysis in Ecology
- Photonic and Optical Devices
- Phase-change materials and chalcogenides
- Numerical methods in engineering
- Aluminum Alloys Composites Properties
- Glass properties and applications
- Radioactivity and Radon Measurements
- Radioactive element chemistry and processing
- Physics of Superconductivity and Magnetism
Japan Atomic Energy Agency
2009-2020
Mitsubishi Materials (Japan)
2014
The University of Tokyo
1997-2013
Tokyo University of Information Sciences
2013
Tokyo University of Science
2003-2011
Shimane University
2011
Geological Survey of Japan
2004-2009
National Institute of Advanced Industrial Science and Technology
2004-2007
Shizuoka University
2007
NTT (United States)
2005
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Some Methyldisilanes Containing Functional GroupsMAKOTO KUMADA, MASAAKI YAMAGUCHI, YOSHIHIRO YAMAMOTO, JUN-ICHI NAKAJIMA, and KYO SHIINACite this: J. Org. Chem. 1956, 21, 11, 1264–1268Publication Date (Print):November 1, 1956Publication History Published online1 May 2002Published inissue 1 November 1956https://doi.org/10.1021/jo01117a013RIGHTS & PERMISSIONSArticle Views372Altmetric-Citations133LEARN ABOUT THESE METRICSArticle Views are...
In eastern Hokkaido, 60 to 80 kilometers above a subducting oceanic plate, tidal mudflats changed into freshwater forests during the first decades after 17th-century tsunami. The gradually rose by meter, as judged from fossil diatom assemblages. Both tsunami and ensuing uplift exceeded any in region's 200 years of written history, both resulted shallow plate-boundary earthquake unusually large size along Kuril subduction zone. This probably induced more creep farther down plate boundary than...
Abstract The relationship between the optical gap and chemical composition in chalcogenide glasses is discussed terms of average heat atomization coordination number. These are computed from heats number elements, respectively.
The Ogaki Dam Reservoir is one of the principal irrigation dam reservoirs in Fukushima Prefecture and its upstream river basin was heavily contaminated by radioactivity from Daiichi Nuclear Power Plant accident. For purpose environmental assessment, it important to determine present condition water reservoir understand behavior sediment-sorbed radioactive cesium under different modes operation dam, as these factors affect further contamination arable farmlands downstream through sediment...
Abstract A series of experimental studies has been made on the effect dilution silane with hydrogen optical properties hydrogenated amorphous silicon films (a-Si:H) prepared by plasma deposition as functions gas-volume ratio γ (=[SiH4]/([SiH4] + [H2])) and substrate temperature T s. The discussed in terms obtained values rate R d, gap E g, Urbach energy u, defect density N content C H refractive index n 0 their correlations between them hydrogen-bonding configuration estimated from infrared...
We report the formation of icosahedral B12H8+ through ion-molecule reactions decaborane ion [B10Hx+ (x=6–14)] with diborane (B2H6) molecules in an external quadrupole static attraction trap. The hydrogen content n B12Hn+ is determined by analysis mass spectrum. result reveals that main product. Ab initio calculations indicate preferentially forms structure rather than a quasiplanar structure. energies B12H14+ and B12H12+ between B10Hx+ (x=6,8) ions, which are considered to be involved...
The depositional process of the Latest Pleistocene to Holocene shallow-marine and fluvial successions is investigated using five 14C-dated borehole cores from Kiso River delta, central Japan. delta succession provides high-quality records transgression regression an enclosed system reveals development fluvial-dominated coastal lowlands. Based on a facies analysis, cored sediments are classified into sedimentary units: A) basal gravel, B) intertidal sand silt, C) transgressive lag deposit,...
完新統を貫く連続した2本のボーリングコアの49試料による高密度な14C年代測定により,濃尾平野における詳細な堆積曲線がはじめて得られた.この堆積曲線とコアの堆積相解析により,後氷期における本平野の堆積プロセスについて検討した.堆積曲線から得られた堆積速度(上方累重速度)は約1～53mm/yrであり,日本列島のデルタとしては大きい.これは,濃尾平野西部の速い沈降と,木曽川などからの大きな堆積物フラックスを反映している.内湾堆積物である中部泥層の最も内陸側に分布する地点と2本のボーリング,および現在のデルタの前縁の4地点の間の3区間でデルタの前進速度が求められた.それらは5,900～4,200cal yrs BPまでが6m/yr,4,200～2,800cal BPまでが10m/yr,そして2,800cal BPから現在までは5m/yrであり,大きく変化したことが明らかになった.
関東平野中央部,埼玉県菖蒲町で掘削された深度350 mボーリングについて,コア(菖蒲コア:GSSB-1)の層相記載と14C 年代測定,テフラ,密度,帯磁率,弾性波速度,自然電位,電気比抵抗の各分析・測定を行った.菖蒲コアは12枚の砂礫層とそれに挟まれた砂層及び泥層からなり,層相の連続性をもとに69のユニットに分けることができる(上位よりユニット1~69).菖蒲コアには39 層準にテフラが挟まれている.このうち深度10.90 mのテフラは御岳Pm-1(ca.100ka)に,深度182.87 mのテフラはKs5(酸素同位体ステージ12の時期に降灰)にそれぞれ対比される可能性が高い.コアの層相と納谷ほか(2009)の珪藻分析結果を総合的に検討し,9層準の海成層(上位よりM1~M9)の分布深度を示した.14C年代値やテフラの対比等から,ユニット1(深度0.50~1.82 m)は沖積層に,ユニット5(深度9.76~10.90 m)は大宮層の一部に,またユニット29~31(深度138.73~164.95...
関東平野中央部の埼玉県南埼玉郡菖蒲町で掘削された菖蒲コア(GS-SB-1: 全長350.20 m)の海成層・非海成層準を識別するために,珪藻化石分析を行った.306試料の検鏡を行った結果,珪藻化石は174試料で産出した.珪藻化石が産出した層準では,淡水生種は159層準で汽水生及び海生種は44層準で産出した.汽水生及び海生珪藻の産出層準に基づくと,菖蒲コアにおける海成層は,27.625~32.875 m,75.45 m,114.375~118.375 m,157.32~164.875 m,216.6~219.3 m,255.1~262.0 m,273.72~276.3 m,280.6~282.6 m,314.4~319.25 m に計9層準認められる.
AbstractSignificant amounts of radioactive materials were released to the atmosphere from Fukushima Daiichi nuclear power plant after accident caused by major earthquake and devastating tsunami on March 11, 2011. Accurate efficient prediction distribution fate eventually deposited at surface in area is primary importance. In order make such a prediction, it important gather information regarding main migration pathways for environment time dependences material transport over long term. The...
We observed that the conductance of undoped hydrogenated amorphous silicon films (a-Si:H) is dominated by an electron accumulation layer at their surface. With increasing oxide thickness band bending diminishes and then converts to hole accumulation. The surface changes from n type p as result light exposure. space-charge was tested changed adsorbate layers water oxygen evaporated Se. It found erroneous conclusions will be drawn about values conductivity activation energy, prefactor,...
Three-dimensional structures of the Latest Pleistocene to Holocene shallow marine and fluvial sequence at Nobi Plain, Central Japan, are reconstructed from 510 boring logs using a 1 km × grid system on GIS. The unconformably covers upper Atsuta formation, consists 5 depositional units - basal gravel bed, Lower Sand (LS), Middle Mud (MM), Upper (US), Top (TM/TS), in ascending order. bed is part which fills valley cutting surface formation. slightly undulating, dissected north-south direction...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadical formation upon butene adsorption on H-mordenitesTsuneki. Ichikawa, Masaaki. Yamaguchi, and Hiroshi. YoshidaCite this: J. Phys. Chem. 1987, 91, 25, 6400–6402Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Published inissue 1 December 1987https://pubs.acs.org/doi/10.1021/j100309a017https://doi.org/10.1021/j100309a017research-articleACS PublicationsRequest reuse permissionsArticle...
典型的な三角州平野である濃尾平野の三角州帯から自然堤防帯に至る平野微地形の形成過程を, 24本の群列浅層ボーリングに基づいて考察した. ボーリングでは層相および粒度組成のサクセッションから, デルタ堆積物とそれを覆う河川堆積物からなる9つの堆積ユニットが識別された. 現在の平野微地形と表層堆積物とは, 明瞭な対応関係を示す. 三角州帯および自然堤防帯の両測線とも, デルタ堆積物上に河川堆積物が累重する. ただし三角州帯では, 自然堤防の発達は小規模かつ断片的である. 一方自然堤防帯では, チャネルが下位の地層を切り込みつつその位置を変え, 側方に自然堤防をつくり, 周辺の地表面を埋没させながら上方に累重する. 両測線の比較から, デルタフロントの通過・堆積以後, 約2,000~2,500年間はデルタシステムが干潟などの低平な地形を形成し, その後, 自然堤防をつくりながら急速に河川システムの累重が進んだ. さらに, デルタの前進に伴い, 上流側の河川システムもほぼ同様の速度で前進してきたと考えられる.