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Improved Interface of Encapsulating Sm-Doped TiO₂ Thin Films/RuO₂ Schottky Diodes for a Junction Spectropy Measurement

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Optics and Photonics Journal 2022年第10期12卷 215-224页

作者： Mariko Murayama Yuri Tamamoto Yingda Qian asuka ishizawa Simon Hammersley Iain F. Crowe Shuji Komuro Shuji Komuro Xinwei Zhao Department of Physics Tokyo University of Science Tokyo Japan Research Institute of Industrial Technology Toyo University Saitama Japan Photon Science Institute and School of Electrical and Electronic Engineering University of Manchester Manchester UK

The excitation process of rare-earth ions in oxide semiconductors for optical emission is thought to be related to defect levels within the band-gap of the host material. In order to improve understanding of the role defect levels play in the energy transfer process, junction spectroscopy techniques can be used to investigate the electrically active emission centres. It has been reported that TiO2 is sensitive to humidity at low temperatures, such as those employed when conducting junction spectroscopy measurements. However, there are not many discussions how to prevent this effect and to improve the quality of measurements. After optimization of samples such as fabrication of flat surface and encupsulant for preventing external effect, temperature dependent-capacitance measurements (C-T) were carried out to characterise shallow traps formed within TiO2 band-gap. TiO2 and Sm-doped TiO2 thin films were deposited on SrTiO3 (100) templates by laser ablaton and rectifying Ruthenium Oxide Schottky diodes deposited on the TiO2 surface by laser ablation. A Sm or Sm-related shallow trap was observed in the Arrhenius plot of TiO2:Sm. In this paper, we show the optimized sample fabrication/preparation process that stabilizes the junction spectroscopy measurements, even in the presence of humidity and we present initial results obtained on samples using these optimized processing techniques.

关键词： Rare Earth TiO2 Photoluminescence Junction Spectroscopy

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Development of gradient microstructure in the lattice structure of AlSi10Mg alloy fabricated by selective laser melting

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Journal of Materials Science & Technology 2020年第1期36卷 106-117页

作者： Mulin Liu Naoki Takata asuka Suzuki Makoto Kobashi Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya464-8603Japan

To identify the microstructural features of the lattice structures of Al alloys built via the selective laser melting(SLM)process,AlSil OMg alloy with a body-centered cubic(BCC)-type lattice structure was *** microstructures comprising melt pools with several columnarα-Al phases withorientations along the elongation direction and surrounded by eutectic Si particles were observed at all portions of the built lattice *** the node portions of the lattice structure,a gradient microstructure(continuous change in microstructure)was *** columnarα-Al phases were observed near the top surface of the node portion,whereas they became coarser and more equiaxed near the bottom surface,resulting in softening localized near the bottom *** the strut portions of the lattice structure,the columnarα-Al phases were elongated along the inclined direction of *** trend was more prevalent near the bottom ***α-Al phases became coarser and more equiaxed near the bottom surface as *** aforementioned results were the basis of a discussion of the development of the gradient microstructure in lattice-structured Al alloys during the SLM process in terms of thermal conductivities at the boundaries between the manufactured(locally melted and rapidly solidified)portions and adjacent(unmelted)alloy powder.

关键词： Additive manufacturing Lattice structure Aluminum alloy Microstructure Thermal conductivity

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Change in microstructural characteristics of laser powder bed fused Al–Fe binary alloy at elevated temperature

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Journal of Materials Science & Technology 2022年第2期97卷 38-53页

作者： Xing Qi Naoki Takata asuka Suzuki Makoto Kobashi Masaki Kato Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan Aichi Center for Industry and Science Technology 1267-1 AkiaiYakusa-choToyota 470-0356Japan

The present study addressed the change in the microstructure of Al-2.5 wt%Fe binary alloy produced using laser powder bed fusion(L-PBF)technique by thermal exposure at 300℃,and the associated mechanical and thermal properties were systematically examined as ***-semi-cylindrical patterns corresponding to melt pools in the microstructure were macroscopically observed for the asmanufactured *** change in the melt-pool morphology was observed after thermal exposure for1000 *** the melt pools,a large number of the nanoscale metastable Al6 Fe phase particles were uniformly distributed inside columnar grains of theα-Al matrix containing concentrated solute Fe in *** sequential formation and coarsening of stableθ-Al13 Fe4 phases were observed upon exposure to a 300℃ environment,but a considerable amount of nano-sized metastable Al6 Fe phases remained even after 1000 ***,the thermal exposure continuously reduced the concentration of solute Fe atoms in theα-Al *** significant grain growth was found inα-Al matrix after 1000 h owing to the pinning effect of the dispersed fine particles on grain boundary *** results demonstrate a sluggish change in microstructural morphologies of the Al-2.5 wt%Fe *** quantified microstructural parameters addressed dominant strengthening contributions by the solid solution of Fe element and Orowan strengthening mechanism by fine Al-Fe intermetallics in the L-PBF-produced *** high strength level was sustained even after being exposed to 300℃ for long *** superior balance of mechanical properties and thermal conductivity can be achieved in the experimental alloys by taking advantage of the various microstructural parameters related to the Al-Fe intermetallic phases andα-Al matrix.

关键词： Al-Fe alloy Laser powder bed fusion Phase transformation Microstructure Tensile properties

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Cultural Landscapes Link to Nature:Learning from Satoyama and Satoumi

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Built Heritage 2018年第4期2卷 7-19页

作者： Maya ishizawa World Heritage Studies University of TsukubaTsukubaJapan

The nature-culture divide is an artificial separation consolidated by Western modern *** is a social construction that disseminated globally,but does not exist in some non-Western *** this framework to embrace an integrated system for sustainability is *** concept of the Historic Urban Landscape(HUL)already attempts to integrate natural and cultural heritage into urban planning by focusing on a landscape ***,this approach consumes rural and nature into the *** uncover nature and return it to the forefront of urban conservation,this paper explores cultural landscapes as examples where natural and cultural values are inextricably *** case studies are presented of satoyama and satoumi,cultural landscapes of Japan where Shinto beliefs and traditional agricultural practices knit together nature and culture,rendering the divide *** paper suggests connecting the HUL approach,with this inclusive understanding,by turning the focus to mapping seasonal relationships following a transdisciplinary approach in which indigenous and local knowledge are integrated,as well as a temporal *** this way,one can find satoyama and satoumi in the urban environment:by looking beyond the attributes,the interrelationships with the natural substratum needed to support the development of quality and resilient environments can be revealed.

关键词： cultural landscapes satoyama satoumi Historic Urban Landscape sustainability reconnecting nature-culture natureculture nature-culture divide intangible cultural heritage

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The Impact of Hurricane Strikes on Short-Term Local Economic Activity: Evidence from Nightlight Images in the Dominican Republic

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International Journal of Disaster Risk Science 2019年第3期10卷 362-370页

作者： Oscar A.ishizawa Juan JoséMiranda Eric Strobl World Bank Group SocialUrbanRural and Resilience(SURR)Global PracticeWashingtonDC20433USA Economic Research World Bank GroupWashingtonDC20433USA University of Bern 3012BernSwitzerland

The Dominican Republic is highly exposed to adverse natural events that put the country at risk of losing hard-won economic, social, and environmental gains due to the impacts of disasters. This study used monthly nightlight composites in conjunction with a wind field model to econometrically estimate the impact of tropical cyclones on local economic activity in the Dominican Republic since 1992. It was found that the negative impact of storms lasts up to 15 months after a strike, with the largest effect observed after 9 months. Translating the reduction in nightlight intensity into monetary losses by relating it to quarterly gross domestic product(GDP) suggests that on average the storms reduced GDP by about USD 1.1 billion(4.5% of GDP 2000 and 1.5% of GDP 2016).

关键词： Dominican Republic Econometric analysis Hurricanes Nightlights

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Microstructural origins of high strength of Al-Si alloy manufactured by laser powder bed fusion:In-situ synchrotron radiation X-ray diffraction approach

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Journal of Materials Science & Technology 2024年第11期178卷 80-89页

作者： Naoki Takata Mulin Liu Masahiro Hirata asuka Suzuki Makoto Kobashi Masaki Kato Hiroki Adachi Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityFuro-choChikusa-kuNagoya 464-8603 Japan Graduate School of Engineering University of HyogoHimeji 671-2280Japan Aichi Center for Industry and Science Technology 1267-1 AkiaiYakusa-choToyota 470-0356 Japan

The microstructural factors contributing to the high strength of additive-manufactured Al-Si alloys us-ing laser-beam powder bed fusion(PBF-LB)were identified by in-situ synchrotron X-ray diffraction in tensile deformation and transmission electron ***-LB and heat treatment were employed to manufacture Al-12%Si binary alloy specimens with different *** an early stage of de-formation prior to macroscopic yielding,stress was dominantly partitioned into the α-Al matrix,rather than the Si phase in all *** concentrated Si solute(~3%)in the α-Al matrix promoted the dynamic precipitation of nanoscale Si phase during loading,thereby increasing the yield *** macroscopic yielding,the partitioned stress in the Si phase monotonically increased in the strain-hardening regime with an increase in the dislocation density in the α-Al *** a later stage of strain hardening,the flow curves of the partitioned stress in the Si phase yielded stress relaxation owing to plastic ***,Si-phase particles localized along the cell walls in the cellular-solidified microstructure play a significant role in dislocation obstacles for strain *** with the results of the heat-treated specimens with different microstructural factors,the dominant strengthening factors of PBF-LB manufactured Al-Si alloys were discussed.

关键词： Laser powder bed fusion Aluminum alloys Microstructures X-ray diffraction(XRD) Strain hardening

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Chopin:The Poet of the Piano

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中学生天地（高中学习版）（C版） 2013年第1期 36-37页

作者： asuka

Frederic Chopin was born in1810in a small Polish town near *** incredible talent was exposed at a young age;by the time he was seven he had already written several *** he was nine,he was performing publicly in *** eve... 详细信息

关键词：中学英语课外阅读阅读材料

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QUARREL

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中学生天地（高中学习版）（C版） 2013年第4期 36-37页

作者： asuka

讲英语难，用英语争吵更难，说那些简单粗俗的脏话未免太不文雅了，让我们来看看这些比较文雅的吵架用语吧!

关键词：中学生英语学习阅读知识课外阅读

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Chinese Television Fan

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中学生天地（高中学习版）（C版） 2013年第6期 34-35页

作者： asuka

不久前，电视剧《甄嬛传》将在美国播出的消息震惊了不少人。原来，“老外”也爱看中国电视剧!这些“中国电视剧迷”自称Cfan——Chinesetelevisionfan的简称，对于未引进的电视剧，他们只能通过网络收看，这催生了不少Cfan字幕组。

关键词：中学生英语学习阅读知识课外阅读高中生

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Efficacy of an orally active small-molecule inhibitor of RANKL in bone metastasis

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Bone Research 2019年第1期7卷 66-75页

作者： Yuta Nakai Kazuo Okamoto asuka Terashima Shogo Ehata Jun Nishida Takeshi Imamura Takashi Ono Hiroshi Takayanagi Department of Immunology Graduate School of Medicine and Faculty of MedicineThe University of TokyoHongo 7-3-1Bunkyo-kuTokyoJapan Department of Orthodontic Science Graduate School of Medical and Dental SciencesTokyo Medical and Dental UniversityYushima 1-5-45Bunkyo-kuTokyoJapan Department of Osteoimmunology Graduate School of Medicine and Faculty of MedicineThe University of TokyoHongo 7-3-1Bunkyo-kuTokyoJapan Department of Molecular Pathology Graduate School of MedicineThe University of TokyoHongo 7-3-1Bunkyo-kuTokyoJapan Department of Molecular Medicine for Pathogenesis Ehime University Graduate School of MedicineShitsukawaToonEhimeJapan

Bone is one of the preferred sites for the metastasis of malignant tumours,such as breast cancer,lung cancer and malignant *** cells colonizing bone have the capacity to induce the expression of receptor activator of nuclear factor-κB ligand(RANKL),which promotes osteoclast differentiation and ***-induced osteoclastic bone resorption leads to a vicious cycle between tumours and bone cells that fuels osteolytic tumour growth,causing bone pain and ***,RANKL contributes to bone metastasis by acting as a chemoattractant to bone for tumour cells that express its receptor,*** inhibition of the RANKL–RANK pathway is a promising treatment for bone metastasis,and a human monoclonal anti-RANKL antibody,denosumab,has been used in the ***,orally available drugs targeting RANKL must be developed to increase the therapeutic benefits to *** we report the efficacy of the small-molecule RANKL inhibitor AS2676293 in treating bone metastasis using mouse *** administration of AS2676293 markedly inhibited bone metastasis of human breast cancer cells MDA-MB-231-5a-D-Luc2 as well as tumour-induced ***2676293 suppressed RANKLmediated tumour migration in the transwell assay and inhibited bone metastasis of the murine cell line B16F10,which is known not to trigger osteoclast *** on the results from this study,RANKL inhibition with a small-molecule compound constitutes a promising therapeutic strategy for treating bone metastasis by inhibiting both osteoclastic bone resorption and tumour migration to bone.

关键词： Bone tumours metastasis

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