Studies on the development of dourine specific diagnostic methods

帯広畜産大学博士（畜産衛生学）2017application/pdf博士学位論文大学院畜産学研究科畜産衛生学専攻Doctoral program in Animal and Food Hygienedoctoral thesi

Working Conditions in Postwar Okinawa and the Problem of “Child Poverty”

Articledepartmental bulletin pape

社外取締役の役割と責務 : コーポレートガバナンスコードと市場再編問題

departmental bulletin pape

Recent research progress on iron- and manganese-based positive electrode materials for rechargeable sodium batteries

Large-scale high-energy batteries with electrode materials made from the Earth-abundant elements are needed to achieve sustainable energy development. On the basis of material abundance, rechargeable sodium batteries with iron-and manganese-based positive electrode materials are the ideal candidates for large-scale batteries. In this review, iron-and manganese-based electrode materials, oxides, phosphates, fluorides, etc, as positive electrodes for rechargeable sodium batteries are reviewed. Iron and manganese compounds with sodium ions provide high structural flexibility. Two layered polymorphs, O3-and P2-type layered structures, show different electrode performance in Na cells related to the different phase transition and sodium migration processes on sodium extraction/insertion. Similar to layered oxides, iron/manganese phosphates and pyrophosphates also provide the different framework structures, which are used as sodium insertion host materials. Electrode performance and reaction mechanisms of the iron-and manganese-based electrode materials in Na cells are described and the similarities and differences with lithium counterparts are also discussed. Together with these results, the possibility of the high-energy battery system with electrode materials made from only Earth-abundant elements is reviewed.review articl

NaFe0.5Co0.5O2 as high energy and power positive electrode for Na-ion batteries

O3-type NaFeO2 is a promising candidate as positive electrode materials for rechargeable Na batteries. However, its reversible range of sodium extraction is relatively narrow (x -= ca. 0.4 in Na1-xFeO2) because of the irreversible structural change, presumably associated with the iron migration into the adjacent tetrahedral sites in Na layers as we recently reported. Herein, we report that cobalt-substituted NaFeO2 demonstrates excellent electrode performance in a non-aqueous Na cell at room temperature. NaFe0.5Co0.5O2 delivers approximately 160 mAh g(-1) of reversible capacity with relatively good capacity retention and excellent rate-capability in a voltage range of 2.5-4.0 V, resulting in reversible formation of NaFe0.5Co0.5O2. The partial substitution of metal element for Fe in O3-type NaFeO2-based materials is proved to be the important strategy to suppress the irreversible phase transition, and thus improving the reversibility of sodium removal/insertion as the electrode materials. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.journal articl

A Survey on the Entrepreneurial Activities of President S．Ohara， Kurabo Industries Ltd． -His Management Ideas in Wartime Controlled Economy-

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小学校高学年を対象とする学級全体への認知再構成の介入効果の検討 : 自閉スペクトラム症的傾向を視点に入れて

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Understanding Particle-Size-Dependent Electrochemical Properties of Li2MnO3-Based Positive Electrode Materials for Rechargeable Lithium Batteries

Electrochemical properties of Li-excess electrode materials, Li1.2Co0.13Ni0.13Mn0.54O2, with different primary particle sizes are studied in Li cells, and phase transition behavior on continuous electrochemical cycles is systematically examined. Although the nanosize (<100 nm) sample delivers a large reversible capacity of 300 mAh g(-1) at the initial cycle, capacity retention is not sufficient as a positive electrode material. Moreover, unfavorable phase transition, gradual enrichment of trivalent manganese ions, and lowering structural symmetry is not avoidable on electrochemical cycles for a nanosize sample, which is confirmed by combined techniques of synchrotron X-ray diffraction, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy. A submicrosize sample also delivers a large reversible capacity of 250 mAh g(-1) even though a slow activation process is observed accompanied with partial oxygen loss and migration oxide ions in the crystal lattice coupled with transition metal migration on the initial charge process. Such an unfavorable phase transition at room temperature is effectively suppressed by the use of a submicrosize sample with low surface area. However, suppression of the phase transition is found to be a kinetically controlled phenomena and is, therefore, unavoidable at elevated temperatures.journal articl

Acrylic Acid-Based Copolymers as Functional Binder for Silicon/Graphite Composite Electrode in Lithium-Ion Batteries

Acrylic acid-based copolymers are synthesized by polymerization of acrylic acid with a small portion of crosslinker, diallyl ethers. The obtained copolymers are soluble in water, and viscosity of their aqueous solution incrementally varies with increase in the amount of crosslinker and neutralization degree of -COOH groups with NaOH. The copolymers are examined as binders for silicon/graphite composite electrodes for lithium-ion batteries. Reversibility and lithiation capacity of the composite are highly improved by the selection of copolymers, which is due to better homogeneity and mechanical durability of the composite electrodes. (C) The Author(s) 2015. Published by ECS.journal articl

On the origin of Jovian decametric radio bursts

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