检索结果-南通市图书馆

Plasma science and Technology 2019年第6期21卷 72-78页

作者： s PUROHIT Y sUZUKI s OHDACHI s yamamoto sOKENDAI The Graduate University for Advanced Studies Toki Gifu 509-5292 Japan National Institute for Fusion science Toki Gifu 509-5292 Japan Institute of Advanced Energy Kyoto University Gokasho Uji Kyoto 611-0011 Japan

The preparation for an experimental soft x-ray tomography study on the Heliotron J (H-J) machine is carried out,with the objectives of evaluating the capability of the current soft x-ray tomographic system in terms of the identification of different mode structures and their poloidal rotation,and the axis shift with different plasma and machine parameters,and fixing the physics goals for the experimental *** preparations were carried out via a simulated soft x-ray data set arising from different plasma conditions,such as magnetic islands,low beta and high *** x-ray tomography (sXT) is performed by the discrete pixel method including singular value decomposition and Phillips-Tikhonov regularization,to obtain clear and smooth *** H-J soft x-ray tomography results from simulated soft x-rays for the equilibrium H-J plasma sensed the magnetic axis shift clearly and an estimate was also *** reconstruction for mode structure m =1/n =1 was obtained along with the realization of the poloidal rotation of the *** reconstruction for the m =2/n =1 mode was not very clear for the current soft x-ray diagnostic *** mode identification was not possible due to the lack of *** sXT from the current soft x-ray diagnostic on H-J,the magnetic axis shift can be estimated and the m =1/n =1 mode can be *** of higher poloidal modes is difficult with the current design.

关键词： Heliotron J tomography soft x-ray magnetohydrodynamics

Why primordial continents were recycled to the deep:Role of subduction erosion

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2017年第2期8卷 337-346页

作者： s.Azuma s.yamamoto H.Ichikawa s.Maruyama Earth-Life science Institute Tokyo Institute of Technology Graduate school of Environment and Information sciences Yokohama National University Geodynamics Research Center Ehime University

Geological observations indicate that there are only a few rocks of Archean Earth and no Hadean rocks on the surface of the present-day *** these facts,many scientists believe that the primordial continents never existed during Hadean Earth,and the continental volume has kept *** the other hand,recent studies reported the importance of the primordial continents on the origin of life,implying their *** this paper,we discussed the possible process that could explain the loss of the primordial continents with the assumption that they existed in the *** depending on the timing of the initiation of plate tectonics and its convection style,subduction erosion,which is observed on the present-day Earth,might have carried the primordial continents into the deep mantle.

关键词： subduction erosion Hadean Plate tectonics Archean

Pulsed Laser Deposition of VO_(2)single Crystal Thin Films on sapphire substrates

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第12期15卷 904-906页

作者： ZHU Pei-ran s.yamamoto A.Miyashita H.Naramoto Institute of Physics Chinese Academy of SciencesBeijing 100080 Department of Materials Development Japan Atom Energy Research InstituteWatanuki 1233TakasakiGumma 370-12Japan

Thin films of VO_(2)single-crystalline on(0001)sapphire substrates have been prepared by visible pulsed laser ablation *** crystal quality and properties of the films are evaluated through electrical resistance measurement,x-ray diffraction(XRD),and Rutherford-backscattering spectroscopy/channeling(RBs/C)*** dependence of the surface electrical resistance of the films on the temperature shows semiconductor-to-metal transitions with the resistance change of 7×10^(3)-2×10^(4).The hysteresis widths are from less than 1 to 3 *** and RBs/C data reveal that the films prepared in particular conditions are single-crystalline VO_(2)with the(010)planes parallel to the surface of the sapphire substrate.

关键词： technique. sapphire Crystal

Fundamental studies on enhancement and blinking mechanism of surface-enhanced Raman scattering （sERs） and basic applications of sERs biological sensing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2014年第1期9卷 31-46页

作者： Yuko s. yamamoto Mitsuru Ishikawa Yukihiro Ozaki Tamitake Itoh Nano-Bioanalysis Research Group Health Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Takamatsu Kagawa 761-0395 Japan Department of Chemistry Josai University Itado Saitama 350-0295 Japan Department of Chemistry School of Science and Technology Kwansei Gakuin University Sanda Hyogo 669-1337 Japan

We review recent our results in the fundamental study of surface-enhanced Raman scattering （sERs） with emphasis on experiments that attempted to identify the enhancement and blinking mechanism using single Ag nanoparticle dimers attached to dye molecules. These results are quantitatively discussed in the framework of electromagnetic mechanism. We also review recent our results in basic sERs applications for biological sensing regarding detections of cell surface molecules and distinction of disease marker molecules under single cell and single molecule level.

关键词： plasmonics surface-enhanced Raman scattering (sERs) surface-enhanced fluorescence,Ag nanoparticle

soil Development and Fertility Characteristics of Inland Valleys in the Rain Forest Zone of Nigeria: Mineralogical Composition and Particle-size Distribution

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2009年第4期19卷 505-514页

作者： s. s. ABE G. O. OYEDIRAN T. MAsUNAGA s. yamamoto T. HONNA T. WAKATsUKI Africa Rice Center (WARDA) Faculty of Agriculture Tottori University Department of Agronomy Ladoke Akintola University of Technology Ogbamoso (Nigeria) Faculty of Life and Environmental science Shimane University Faculty of Agriculture Kinki University

The particle-size distribution and mineralogical composition of the clay （〈 2 μm） and fine-sand （0.25-0.10 mm） fractions in soils of two inland valleys in Abakaliki and Bende, southeast Nigeria, were investigated to provide basic information on soil-forming processes and agricultural potentials. These soils were silty or clayey, deriving from Cretaceous or Tertiary shale materials. The particle-size distribution and its computation on a clay-free basis revealed relatively remarkable lithologic breaks in a couple of pedons. The effect of lithologic discontinuities on soil mineralogical composition was not, however, conspicuous. Petrographic investigation revealed that quartz predominantly comprised the fine-sand fraction in the soils at both study sites. Nevertheless, the clay mineralogical composition of the soils was a mixture of kaolinite, irregularly interstratified smectite-illite intergrades （s/I）, hydroxyl-A1 interlayered 2：1 type clays （HICs）, vermiculite, smectite, halloysite and illite along with fine-sized quartz in Abakaliki. The soils of Bende predominantly contained smectite, which was partially interlayered with hydroxyl-A1 and kaolinite. It is suggested that seasonal floodwater has slowed the disintegration of weatherable clay minerals inherited from the shale, while quartz originating from the sandstone is predominant in the fine-sand fraction. Additionally, a possible soil-forming process observed at the both study sites was ferrolysis, which was indicated by a clear decreasing pattern of HICs downward in the soil profiles, The entry of s/I and vertical distribution patterns for a couple of clay minerals in the pedon suggested that the soils in Abakaliki have developed under the significant influence of aeolian dust delivered by the Harmattan. The findings might describe a site-specific deposition pattern of Harmattan dusts as well as hydromorphic soil-forming processes in the wetlands of the inland valleys.

关键词： aeolian dust ferrolysis hydromorphic soil hydroxyl-A1 interlayered 2:1 type clays southeast Nigeria

Changes in soil Physicochemical Properties Following Land Use Change from Paddy Fields to Greenhouse and Upland Fields in the southeastern Basin of Dianchi Lake,Yunnan Province,China

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2013年第2期23卷 169-176页

作者： N.MORITsUKA T.NIsHIKAWA s.yamamoto N.MATsUI H.INOUE LI Kun-Zhi T.INAMURA Laboratory of Plant Production systems Graduate School of AgricultureKyoto University Kagoshima University KANsO Technos Kunming University of science and Technology

Paddy fields in the southeastern basin of Dianchi Lake have rapidly changed to greenhouses since 1999. A total of 61 surface soil samples, including 43 greenhouse soils, 12 upland soils, and 6 paddy soils, were collected from a flat lowland area mainly used for agricultural production fields in the southeastern basin of Dianchi Lake. Analyses of the soil samples indicated that the greenhouse soils were characterized by a lower organic matter content, lower pH, and higher soluble nutrients than the paddy soils in the area. The lower organic matter content of the greenhouse soils was ascribed to environmental or management factors rather than the clay content of the soil. Accumulation of soluble nutrients, especially inorganic N, was due to over-application of fertilizers, which also caused soil acidification. The average amount of readily available N, P, and K accumulated in the greenhouse soils was estimated to be equal to or higher than the annual input of these nutrients as a fertilizer, indicating that a reduction in fertilizer application was possible and recommended. In contrast, a very low available si content was observed in the paddy soils, suggesting the need for si application for rice production.

关键词： available si greenhouse soils inorganic N phosphorus salinization

Tonalites and plagiogranites of the Char suture-shear zone in East Kazakhstan:Implications for the Kazakhstan-siberia collision

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2016年第1期7卷 141-150页

作者： M.L.Kuibida I.Yu.safonova P.V.Yermolov A.G.Vladimirov N.N.Kruk s.yamamoto lnstitute of Geology and Mineralogy sB RAs Koptyuga ave.3Novosibirsk630090Russia Novosibirsk state University Pirogova St.2Novosibirsk630090Russia IPCON Joint Venture Academy of Sciences of Kazakhstanlppodromnaya 5100019KaragandaKazakhstan Tomsk state University Lenina St.36Tomsk634050Russia University of Tokyo MeguroTokyo153-8902Japan

The paper presents first Ue Pb zircon ages and geochemical data from Carboniferous granitoids（tonalites and plagiogranites） of the Char sutureeshear zone in East Kazakhstan, which is located in the northwestern Central Asian Orogenic Belt（CAOB）. The study included analysis of geological setting, major and trace elements, and rock petrogenesis. The Char tonalites and plagiogranites occur as NW-striking linear chains inside Visean serpentinite mélange. Petrographycally, the tonalites show signs of syntectonic deformation, and the plagiogranites are less deformed suggesting their later intrusion. The tonalites yielded a LA-ICP-Ms zircon age of ca. 323 Ma, i.e. exactly at the boundary between the early and late Carboniferous. Compositionally, the tonalites and plagiogranites are characterized, respectively, by high siO2（67-70 and 73-74 wt.%） and Al2O3（17-19 and 14-15 wt.%）, sr/Y 〉 40 and low Yb=0.2-0.5 *** multi-element patterns show clear Nb-Ta negative anomalies. The low Nb/Ta ratios（7-15） and Zr（114-191 ppm） suggest a MORB-type protolith（amphibolite） with subchondritic Nb/Ta（8-17） and low Zr（1-72 ppm）. The low contents of K and Rb suggest weak assimilation of the melts by island arc felsic crust. The subchondritic Nb/Ta ratios exclude their derivation by the melting of subducted/dehydrated MORB. We argue that the Char high-Al tonalites and plagiogranites formed by the melting of hydrated MORB at the base of the mafic lower crust at pressures of 10-15 kbar. The occurrences of the Char tonalites and plagiogranites inside the Visean serpentinite mélange overlapped by serpukhovian conglomerates, their alignment parallel to deformation zones, and their geochemical features suggest their origin by the melting of mafic lower crust in relation to the collision of the siberian and Kazakhstan continents.

关键词： Earlyelate Carboniferous boundary NW Central Asian Orogenic Belt U-Pb ages Whole-rock geochemistry Petrogenesis Mafic crust melting

MHD Instabilities and Their Effects on Plasma Confinement in Large Helical Device Plasmas with Intense Neutral Beam Injection

在线全文

学校读者我要写书评

暂无评论

Plasma science and Technology 2004年第3期6卷 2269-2274页

作者： K.Toi s.Ohdachi s.yamamoto s.sakakibara K.Y.Watanabe N.Nakajima X.Ding J.Li s.Morita K.Narihara K.Tanaka T.Tokuzawa H.Yamada Q.Yang National Institute for Fusion science Toki 509-5292 Japan Dep. Energy Eng. sci. Nagoya Univ. Nagoya 464-8603 Japan southestern Institute of Physics Chengdu China Institute of Plasma Physics Chinese Academy of Science China

MHD stability of the Large Helical Device (LHD) plasmas produced with intenseneutral beam injection is experimentally studied. When the steep pressure gradient near the edge isproduced through L-H transition or linear density ramp experiment, interchange-like MHD modes whoserational surface is located very close to the last closed flux surface are strongly excited in acertain discharge condition and affect the plasma transport appreciably. In NBI-heated plasmasproduced at low toroidal field, various Alfven eigenmodes are often excited. Bursting toroidalAlfven egenmodes excited by the presence of energetic ions induce appreciable amount of energeticion loss, but also trigger the formation of internal and edge transport barriers.

关键词： interchange instabilities L-H transition alfven eigenmodes

Observation of Edge Plasma Fluctuations with a Fast Camera in Heliotron J

在线全文

学校读者我要写书评

暂无评论

Plasma science and Technology 2013年第3期15卷 213-216页

作者：臧临阁 M.TAKEUCHI N.NIsHINO T.MIZUUCHI s.OHsHIMA K.KAsAJIMA M.sHA K.MUKAI H.Y.LEE K.NAGAsAKI H.OKADA T.MINAMI s.KOBAYAsHI s.yamamoto K.HANATANI Y.NAKAMURA s.KONOsHIMA F.sANO Graduate school of Energy science Kyoto University Naka Fusion Institute Japanese Atomic Energy Agency Graduate school of Engineering Hiroshima University Institute of Advanced Energy Kyoto University

A fast video camera is verified to be a powerful t0ol for observation of filaments/blobs near the last closed flux surface （LCFs）. In order to extract the fluctuation component from the raw data of the fast camera, a pre-processing technique, sliding time window averaging subtraction （sTWAs） has been developed to remove the background of slowly varying emission from the bulk plasma. By using this pre-processing technique, the fast camera data are analyzed. A method to identify the filaments in the pre-processed image is also discussed.

关键词： edge plasma fluctuation fast camera Heliotron J

在线全文

学校读者我要写书评

暂无评论

一种气动静重活塞压力计的校准

国外计量 1983年第3期 48-50页

作者： s.yamamoto 徐罗庚

1.引言到目前为止,小于几百 kPa 的低气压的精密测量大多数是用水银柱压力计来完成的,而在这个范围以上的中等压力均用常规的静重活塞压力计来进行测量,这种压力计是用润滑油作为压力传递介质。为了扩大这两种压力计的工作范围,并且把... 详细信息

1.引言到目前为止,小于几百 kPa 的低气压的精密测量大多数是用水银柱压力计来完成的,而在这个范围以上的中等压力均用常规的静重活塞压力计来进行测量,这种压力计是用润滑油作为压力传递介质。为了扩大这两种压力计的工作范围,并且把根据不同原理建立起来的各种压力标连接起来以检验准确度的一致性,人

关键词：活塞式压力计有效面积活塞压力计气压计