Search Results 1-20 of 754

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Habitat characteristics and size structure in a population of an endangered lamprey, Lethenteron sp. N, in an urbanized area of Japan

Hirano Yuna , Kidera Noriko , Kondo Natsuko I. , Nishihiro Jun

Ichthyological research : an official journal of the Ichthyological Society of Japan 67(4), 545-551, 2020-11-05
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Tazawako caldera, NE Japan and its eruption products [in Japanese]

Kano Kazuhiko , Ohguchi Takeshi , Hayashi Shintaro , Yanai Keizo , Ishizuka Osamu , Miyagi Isoji , Ishiyama Daizo

田沢湖カルデラから2-1.8Maのある時期に噴出した火砕流密度流起源のテフラを記載した．下部は多面体～平板型ガラス片と岩片に富むテフラで，マグマ水蒸気爆発に伴ってカルデラ崩壊が始まったことを示唆する．上部は淘汰不良無層理の気泡型ガラス片に富むテフラで，岩屑なだれ堆積物と共存しており，カルデラ形成噴火最盛期に放出されたことを示唆する．これらは長期的にわたって侵食され田沢湖近傍でさえ …

The Journal of the Geological Society of Japan 126(5), 233-249, 2020

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3

A METHOD TO IDENTIFY MODAL PROPERTIES OF SMALL-SCALED SEDIMENTARY BASIN [in Japanese]

SUZUKI Yusuke , IIYAMA Kahori , MORIKAWA Hitoshi , SAKAI Kimitoshi , ARAKI Go

　堆積盆地や埋積谷のような不整形地盤ではその基盤形状を反映した堆積層の振動モードが形成されることが知られている．このことは観測記録等から堆積層の振動モードを同定できればその基盤形状をも推定できる可能性を示唆している．しかし，小規模な埋積谷では狭い周波数帯に振動モードが多数含まれる上ノイズも混在するため，モード同定そのものが難しいことが予想される．本研究では小規模な埋積谷の振動モー …

Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 76(2), 312-319, 2020

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4

Gross anatomical and ultrastructural characterization of the oropharyngeal cavity of the Egyptian nightjar Caprimulgus aegyptius: Functional dietary implications

EL-MANSI Ahmed , AL-KAHTANI Mohamed , ABUMANDOUR Mohamed , EZZAT Ahmed , EL-BADRY Dina

… The body of the tongue has both small and large conical papillae for capturing and retrieving insects, and is separated from the root by a distinct papillary crest. …

ORNITHOLOGICAL SCIENCE 19(2), 145-158, 2020

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5

Study of Spin Transport and Magnetoresistance Effect in Silicon-based Lateral Spin Devices for Spin-MOSFET Applications

Ishikawa M. , Saito Y. , Hamaya K.

… By using n+-Si spin-transport layers with a small cross-sectional area of ~0.3 μm2, we can observe 50-fold the magnitude of four-terminal nonlocal (NL) magnetoresistance signals and NL Hanle signals at room temperature in previous works. … Also, we clarify that inter-valley spin-flip scattering is one of the dominant spin relaxation mechanisms in n+-Si at room temperature. …

Journal of the Magnetics Society of Japan 44(3), 56-63, 2020

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6

"SATOYAMA green-infrastructure", a measure for climate change adaptation: potential for multipurpose usage of abandoned paddy on small valley bottoms in the Lake Inbanuma watershed, Chiba, Japan. [in Japanese]

NISHIHIRO Jun , OHTSUKI Kazuaki , KOHZU Ayato , KATO Hiroki , OGASAWARA Shogo , SATAKE Yasutaka , SHOJI Taro , HASEGAWA Masami , KONDOH Akihiko

著者らは，かつて里山として利用されてきた自然環境を持続可能で魅力的な地域づくりに役立てる方策を「里山グリーンインフラ」と称し，個々の活動の有効性の検証や社会実装について議論している．本稿では，印旛沼流域に広く分布し，かつて水田として利用され，現在では多くが耕作放棄地になっている「谷津」（台地面に刻まれた枝状の幅の狭い谷）に着目し，谷津の湿地としての維持・再生や，その流域の台地・斜 …

Ecology and Civil Engineering 22(2), 175-185, 2020

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7

Survival and Mortality Rates for 17 Years in a Quercus serrata Secondary Forest Damaged by Mass Mortality Due to Japanese Oak Wilt [in Japanese]

Nishikawa Shoko , Kubo Masako , Ozaki Yoshinobu

コナラ林におけるナラ枯れの進行過程とナラ類およびクリ（以下，ナラ類としてまとめる）の動態を明らかにするため，島根大学三瓶演習林の1 haのコナラ林で2001年から2018年の17年間のナラ類の生残および枯死，胸高直径の変化を調べた。ナラ枯れが確認された2012年から2014年の各年は枯死個体の分布も調べた。その結果，ナラ枯れ発生前は，ナラ類の小径木が枯死するものの胸高断面積合計は …

Journal of the Japanese Forest Society 102(1), 1-6, 2020

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8

Bird communities of two forest types in Chitwan Valley, Nepal

ENGSTROM R. Todd , EDENIUS Lars , THAPA Tej B. , BIDARI Basu , GURUNG Anil , MIKUSIŃSKI Grzegorz

… Riverine forest had over twice the density of trees per ha (many small trees), higher tree species richness, and greater basal area than Sal forest. …

ORNITHOLOGICAL SCIENCE 19(1), 29-40, 2020

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9

The Place Name Kariyado in the Tohoku Region of Japan : Roads and River Crossings in Medieval Times [in Japanese]

青山宏夫

… Kariyado in Natori City is located at a slightly elevated point that protrudes in a tongue shape into a small valley bottom plain. … Kariyado in Shirakawa City is located in a fluvial terrace that protrudes in a tongue shape into the valley bottom plain along Abukumagawa river. …

史林 = The Journal of history 102(5), 757-781, 2019-09

IR DOI
10

Regional Economy and Its Innovative Companies : Cases of the largest four manufacturing companies in Vorarlberg, Austria [in Japanese]

山本健兒

… The population of the largest city in this region, Dornbirn, is under 50,000 and the other urban municipalities are distributed away from each other in the Alpen-Rhine Valley and Walgau. … Vorarlberg is a rural region with several small urban settlements, and it has no distinguished mineral resources. … / As the founders started their respective business, they were small and did not have distinctive technology. …

経済学研究 = Journal of Political Economy 86(1), 61-111, 2019-06

IR
11

STUDY ON THERMAL AND WIND ENVIRONMENT IN HILLY CITY WITH YATO TOPOGRAPHY:Understanding the current situation and proposing planning guideline for each topography classification using field measurement and numerical calculation [in Japanese]

YOKOYAMA Makoto , TANAKA Takahiro , SUGIYAMA Toru , SADOHARA Satoru

… Inland area has complicated topography and a lot of small valleys called "Yato". … Generally, such valley area seems to be bad ventilation and heats tends to accumulate in valley because of its topographical characteristics. …

Journal of Environmental Engineering (Transactions of AIJ) (758), 457-467, 2019-04

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12

Spatial and seasonal changes in soluble ions and chlorophyll a concentration on the surface of snow pack in Mt. Tateyama, Japan [in Japanese]

TAKEUCHI Nozomu , SUGIYAMA Ryo

富山県立山室堂平の積雪表面の化学条件の決定要因およびその雪氷藻類への影響の有無を明らかにすることを目的に，積雪表面の化学成分およびクロロフィル濃度の空間分布およびその季節変化を地図化した．融雪前の4 月では，ほとんどの化学成分が室堂平の南側で高く北側で低い傾向を示した．一方，水の安定同位体比，pH，およびCl− 濃度は，地獄谷噴気孔の付近の積雪が周辺と比べて異なる分布を示した．融雪が進む5 月以降 …

Journal of the Japanese Society of Snow and Ice 81(5), 231-247, 2019

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13

Great Kanto Earthquake, Great Tokyo Air Raid, and Cho-scale Changes in the Socio-spatial Patterns of the Inhabitants of Central Tokyo (1920-1965) [in Japanese]

KAJITA Shin

… (2) There were only small differences in the socio-spatial structure between areas within 5 km of central Tokyo in 1920 and those in 1965. … Nevertheless, small and medium-size factory and blue-collar areas in the western valley region diverged. …

Journal of Geography (Chigaku Zasshi) 128(6), 855-878, 2019

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14

NUMERICAL STUDY ON THE DRAG REDUCTION OF THE WIDE-RIB RECTANGULAR GROOVES

Chonghai HUANG , Jinjia WEI , Wei WANG , Jinlan GOU , Qi XIAO

… The bottom of grooved valley shows much smaller wall shear stress due to the “restriction effect” … Moreover, the numerous secondary streamwise vortices with smaller scale, which were induced by the grooves and stayed within the grooved valleys and then prevented the small near-wall vortices from intruding into the grooved valleys, should be the essential factor and the prerequisite of drag reduction of microgrooves. …

The Proceedings of the International Conference on Nuclear Engineering (ICONE) 2019.27(0), 1308, 2019

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15

Analysis of Geospatial Structure of Probabilistic Flood Hazard, using the ensemble flood simulation and point-based hazard curves. [in Japanese]

YAMADA Masafumi , CHIBANA Takeyoshi , WATANABE Satoshi

気候変動による降雨強度の増大など災害外力の強大化が想定され，一方で将来的な公共事業財源の不足も危惧される中で，河道整備・ダム整備等のハード対策に留まらず，都市計画・土地利用計画や風水害保険等のソフト対策を組み合わせた，流域を主体とした治水対策の設計が重要となる．流域内の各地先において適切な対策を選択するためには，各地先における被害額とその発生確率の関係である点的なリスクカーブや， …

Proceeding of Annual Conference 32(0), 34, 2019

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16

OVERALL FEATURES OF MULTIPLE LAND-SLIDES ALONG TRISHULI RIVER TRIGGERED BY THE 2015 GORKHA EARTHQUAKE, NEPAL

NAKATA Alessandra Mayumi , TOMITA Hikaru , KONAGAI Kazuo , SHIGA Masataka , IKEDA Takaaki , POKHREL Rama Mohan

… Considering the difficulty in obtaining material properties of weathered matters of metamorphic rock accumulated along gorges on valley walls, the number of material parameters used in this evaluation procedure is limited as small as possible; …

Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 75(4), I_554-I_561, 2019

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17

Boost Inverter Topology with High-Frequency Link Transformer for PV Grid-Tied Applications

Radwan Hamdy , Sayed Mahmoud A. , Takeshita Takaharu , Elbaset Adel A. , Shabib G.

… The proposed topology has many advantages such as increasing the inverter output voltage level, MPPT, high reliability, small size, and light weight. …

IEEJ Journal of Industry Applications 8(5), 849-856, 2019

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18

Relationship between distribution of large-diameter stems and topography in approximately 65-year-old secondary forest in the Yambaru area of Okinawa Island [in Japanese]

Takashima Atsushi , Oshima Junko

大径木は，亜熱帯性照葉樹林の保全において重要な指標であると考えられている。そこで本研究では，沖縄島やんばる地域に広がる約65年生の二次林において，大径木の分布と地形の関係を小流域レベルで調査した。その結果，胸高直径30cm以上の大径木の密度は全樹種合計で91.0本／haであり，そのうちイタジイが65.2%，イジュが20.9%，オキナワウラジロガシが6.4%を占めていた。やんばる地 …

Japanese Journal of Forest Planning 52(2), 59-65, 2019

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19

Early Jomon fishing activities reconstructed from the fish assemblages of the I-trench expansion of the northern valley area at the Sannai Maruyama site, Aomori Prefecture, Japan [in Japanese]

Komiya Hajime , Katayama Owens Mio , Hamada Shingo , Habu Junko

遺跡の魚類構成は先史漁撈研究の基礎データの一つであり，その信頼性はサンプリングと同定の精度に関わっている。魚類遺存体の同定には頭骨を構成する顎骨などが多用されるが，調理され食べられた魚の骨は原形を失っており，日本近海だけでも約4,000種に及ぶ魚種を考古学者が正しく同定するのは困難と思われる。一方，脊椎骨の椎体は遺跡堆積物中でも保存状態が良好であるにもかかわらず，これまで種同定に …

Anthropological Science (Japanese Series) 127(1), 1-13, 2019

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URBAN CLIMATIC ZONING USING MSSG MODEL AND MULTIVARIABLE ANALYSIS:For making urban environmental climate maps of Yokohama considering microtopography [in Japanese]

YOKOYAMA Makoto , TANAKA Takahiro , SUGIYAMA Toru , SADOHARA Satoru

… However, in hilly cities like Yokohama, there are many small valleys and the complicate topography, so it seems that there are some effects by microtopography on urban climate. …

Journal of Environmental Engineering (Transactions of AIJ) 84(759), 533-542, 2019

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