検索結果 484件中 1-20 を表示

  • Temperature-dependent current–voltage characteristics and ultraviolet light detection of heterojunction diodes comprising n-type ultrananocrystalline diamond/hydrogenated amorphous carbon composite films and p-type silicon substrates

    Zkria Abdelrahman , Yoshitake Tsuyoshi

    … %) nitrogen-doped n-type ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCD/a-C:H) films and p-type Si substrates were prepared in nitrogen and hydrogen mixed gas atmosphere by coaxial arc plasma deposition. … The temperature dependence of the ideality factor and reverse saturation current reveals that carrier transport predominantly occurs in the generation–recombination mechanism and, at low temperatures, it accompanies tunneling via weak traps. …

    Jpn. J. Appl. Phys. 56(7S2), 07KD04, 2017-06-27


  • 富山平野において近接する窒素飽和・非飽和落葉広葉樹林の窒素動態の比較

    牧野 奏佳香 , 徳地 直子 , 福島 慶太郎 , 川上 智規

    <p>富山平野中央に位置する呉羽丘陵と射水丘陵は近接しており,近年の窒素(N)負荷量は同程度であるにもかかわらず,呉羽丘陵内の集水域からのN 流出量が射水丘陵内の約17倍多いことが報告されており,呉羽丘陵でのみ窒素飽和が指摘されている。そこで本研究では,呉羽丘陵における窒素飽和現象について,2丘陵の生態系内のN シンク,すなわち,林分内の植生および土壌への保持,および渓流水への流出を比 …

    日本森林学会誌 99(3), 120-128, 2017


  • 群馬県神流川渓流域の森林の窒素飽和現象に関する研究

    吉井 咲夢 , 飯島 明宏 , 森 勝伸 , 板橋 英之

    Nitrogen saturation (N-saturation) is a phenomenon caused when nitrogen is saturated in forest soil, which is input into river water. … Our purpose was to estimate the degree of N-saturation in the upstream area of the Kanna River in Gunma Prefecture, which has never been contaminated by industrial wastewater and domestic drainage. …

    分析化学 66(1), 49-54, 2017


  • 鵜川水系水質に関する研究(第2報)硝酸イオン濃度の季節変動

    福崎 紀夫 , 村井 沙耶 , Fukuzaki Norio , Murai Saya

    … In recent years, there has been grate concerns for the nitrogen saturation phenomenon in forest ecosystems caused by increased wet and dry deposition of nitrogen compounds emitted from the combustion of fossil fuels. … The nitrogen saturation phenomenon is considered to be that increased nitrogen flow out to forest stream not only in the non-growth period but also in the growth period of forest plants. …

    新潟工科大学研究紀要 (20), 23-31, 2016-03


  • 横浜市大岡川源流域における森林渓流水質

    苗村 晶彦 , 楊 宗興

    <p>横浜市内を流れる都市河川・大岡川の源流域の森林渓流水において平水時濃度を測定し,対照区として奥秩父の森林渓流水と比較した。結果,大岡川の渓流水中のCl<sup>-</sup>濃度は平均366 µMとなり奥秩父と比較して14倍,NO<sub>3</sub><sup>-</sup>濃度は平均104 µM(同様に3 …

    環境科学会誌 29(4), 201-205, 2016


  • High-Pressure Synthesis of New Magnetic Compound in Mn–Li–N System

    Matsushita Itsuki , Kamegawa Atsunori , Sugimoto Satoshi

    … The saturation magnetization and coercivity of a sample synthesized under 5 GPa at 1100℃ for 2 h were 17.73 A∙m<sup>2</sup>/kg and 310.7 kA/m, respectively.</p> …

    MATERIALS TRANSACTIONS 57(10), 1832-1836, 2016


  • 生態系モデルBEAMSを用いた日本全域の土壌窒素飽和率の評価

    佐々井 崇博

    近年、工業化や越境汚染により日本の窒素降下量は急激に増加している。降下量が生態系を介して温暖化に与える影響を空間的に評価することは重要であろう。しかし、その影響を広域評価した研究は非常に少なく、土壌の窒素飽和を面的に捉えた研究例はない。本発表では、窒素循環を再現する生態系モデルを開発し、1kmメッシュ分解能で日本全域の窒素飽和率を推定した。モデル検証では、落葉樹林と混交林の計5地点での葉のC/N比 …

    日本森林学会大会発表データベース 127(0), 711, 2016


  • 窒素飽和に伴うコナラ林の樹木根変化

    大野 聡 , 楊 宗興

     近年、人為的な無機態窒素の放出量が増大しており、森林生態系への影響が懸念されている。無機態窒素過多による植物への影響としては、root/shoot比の減少や根の形態変化などが報告されているが、その多くはポット実験であり実環境中の成木への影響について検討された例は少ない。そこで本研究では、人為的な窒素沈着量の大きい都市近郊の森林と都市から離れた森林において、成木の根の量や物理的・化学的特性に差がみ …

    日本森林学会大会発表データベース 127(0), 259, 2016


  • Investigation of bilayer HfNx gate insulator utilizing ECR plasma sputtering

    Atthi Nithi , Ohmi Shun-ichiro

    … The n-MISFET with bilayer HfNx gate insulator exhibited saturation mobility (μsat) of 47 cm2/(V s), which higher than the device with directly deposited HfN1.3 gate insulator. … HfNx interfacial layer (IL) with low nitrogen concentration was found to significantly improve the interface properties of HfNx gate stacks. …

    IEICE Electronics Express 13(10), 20160054-20160054, 2016


  • Investigation of bilayer HfN gate insulator utilizing ECR plasma sputtering

    Atthi Nithi , Ohmi Shun-ichiro

    … The n-MISFET with bilayer HfN gate insulator exhibited saturation mobility (μsat) of 47 cm2/(V s), which was higher than the device with direct deposited HfN1.3 gate insulator. … HfN interfacial layer (IL) with low nitrogen concentration was found to significantly improve the interface properties of HfNx gate stacks. …

    IEICE Electronics Express advpub(0), 2016


  • 関東地方の窒素負荷量の異なる2地域における4樹種の窒素炭素安定同位体比と葉の性質

    稲垣 善之 , 稲垣 昌宏 , 橋本 徹 [他]

    森林総合研究所研究報告 = Bulletin of the Forestry and Forest Products Research Institute 14(4), 201-208, 2015-12

  • Effects of agricultural wastes on the hydraulic properties of a loamy sand cropland in Turkey(Desertification Special Section papers)

    GULSER Coskun , CANDEMIR Feride

    … The effects of agricultural wastes on field capacity (FC), permanent wilting point (PWP), available water content (AWC), relative saturation (RS) and initial infiltration rate (IR) were determined for a loamy sand soil 7 months after agricultural wastes were incorporated to 15 cm soil depth at four different rates (0,2%, 4% and 6%, weight:weight) in a randomized plot design experiment with three replicates. …

    Soil science and plant nutrition 61(3), 384-391, 2015-06

  • Improved electrical characteristics of amorphous InGaZnO thin-film transistor with HfLaO gate dielectric by nitrogen incorporation

    Song Jiaqi , Qian Lingxuan , Leung Cheunghoi , Lai Puito

    … With the appropriate incorporation of nitrogen into the HfLaO gate dielectric, the saturation mobility of the TFTs can reach 31.3 cm<sup>2</sup>V<sup>−1</sup>s<sup>−1</sup>, which is more than twice that of the control sample with the HfLaO gate dielectric, as a result of the passivation of traps at/near the dielectric/a-IGZO interface by the nitrogen incorporation. …

    Appl. Phys. Express 8(6), 066503, 2015-05-26


  • Distinctive organic matter pools among particle-size fractions detected by solid-state ^<13>C-NMR, δ^<13>C and δ^<15>N analyses only after strong dispersion in an allophanic Andisol(Soil chemistry and soil mineralogy)

    ASANO Maki , WAGAI Rota

    … following sodium saturation. … Here, we focused on comparing the carbon structure and carbon and nitrogen stable isotope ratio (δ^<13>C and δ^<15>N) among the particle- size fractions isolated by limited dispersion (mechanical shaking) and by the maximum dispersion treatments for the allophanic Andisol previously examined. …

    Soil science and plant nutrition 61(2), 242-248, 2015-04

  • 森林域から流出する硝酸の起源:土壌水中の硝酸との三酸素同位体組成比較

    小幡 祐介 , 安藤 健太 , 大山 拓也 , 中川 書子 , 角皆 潤 , 山下 尚之 , 齋藤 辰善 , 佐瀬 裕之

    森林生態系において高濃度の硝酸を含む渓流水の流出は、下流域の湖沼などの生態系に対して富栄養化などの深刻な影響をもたらす可能性がある。そのため渓流水中の硝酸の起源や挙動を明らかにすることは極めて重要である。そこで本研究では一般の化学反応で変化しない三酸素同位体組成(Δ<SUP>17</SUP>O)を用いて渓流水中に高濃度で存在する硝酸の起源を調べた。また、土壌水中に含まれる硝 …

    日本地球化学会年会要旨集 62(0), 205, 2015


  • 日本の森林火山灰土壌における粒径と窒素蓄積との関係

    落合 夏人 , 徳地 直子

    温帯の森林の多くは窒素(N)制限だが、近年N降下量は増大している。森林土壌に負荷されたNの多くは土壌有機物となり蓄積される。この土壌有機物は様々な形態で存在し、それぞれ環境変化への応答が異なる。これまで、土壌有機物中のNはMAOM (Mineral Associated Organic Matter)またはPOM (Particulate Organic Matter)の形で存在し前者の方が安定だ …

    日本森林学会大会発表データベース 126(0), 590, 2015


  • Characteristics of Soils under the Forest Steppe in Mongolia

    OGUMA Koichiro , TAMURA Kenji , KAMIJO Takashi [他] , KAWADA Kiyokazu , JAMSRAN Undarmaa

    … We analyzed soil organic carbon, total nitrogen, pH (H2O, KCl), exchangeable bases, CEC and humic substances. … On Phaeozems characterized by a high C content and high base saturation ratio, the A horizon became thicker, the humic C to fulvic C ratio increased, and the ratio of humic acid to humic + fulvic acids increased as the vegetation changed from forest to grassland. … In contrast, Umbrisol was characterized by a low C content, a high C/N ratio and a low base saturation ratio. …

    沙漠研究 25(3), 145-148, 2015


  • Nitrogen Uptake and Utilization by No-Tillage Rice under Different Soil Moisture Conditions – A Model Study under Simulated Soil Conditions

    Yang Cailing , Xu Shihong , Liu Lilong , Huang Min , Zheng Tuying , Wei Shanqing , Zhang Yu , Deng Guofu , Jiang Ligeng

    … The purpose of this study was to quantify the effects of nitrogen fertilizer on no-tillage rice cultivation under various soil moisture conditions, in order to determine the suitable soil moisture content for rice production by no-tillage cultivation. … <sup>15</sup>N was used as the nitrogen fertilizer. … Yield, dry matter accumulation, nitrogen concentration and <sup>15</sup>N abundance of maturity were determined for each sample. …

    Plant Production Science 18(2), 118-127, 2015


  • Effect of nitrogen loading on the growth and photosynthetic responses of Japanese larch seedlings grown under different light regimes

    JI Dong Hun , MAO QiaoZhi , WATANABE Yoko [他] , KITAO Mitsutoshi , KITAOKA Satoshi

    …  We determined the effects of nitrogen (N) loading (35 kg N ha<sup>-1</sup> … Nitrogen deposition in forests has been increasing in East Asia. … The net photosynthetic rate at light saturation (<i>P</i><sub>sat</sub>) decreased with increasing shading. … Nitrogen addition increased <i>P</i><sub>sat</sub> …

    農業気象 71(3), 232-238, 2015


  • Photomechanical Response of Amorphous Carbon Nitride Thin Films on SiO<sub>2 </sub>Substrate

    Harata Tomo , Aono Masami , Kishimura Hiroaki , Kitazawa Nobuaki , Watanabe Yoshihisa

    … specimens, all of the specimens began to be bent immediately when the light was turned on and off, and then the deformation reached to the saturation value after about 4 s. … The photomechanical response speed increased with increasing the nitrogen concentration, and the graphite like specimen showed low photomechanical responsivity. …

    e-Journal of Surface Science and Nanotechnology 13(0), 352-356, 2015