473 research outputs found
Japanese Fusion Materials Development Path to DEMO
No full textThis paper reports Japanese strategy for developing blanket structural materials for DEMO. In the Japanese program, the candidate materials are categorized into Primary Option (RAFM) and Advanced Options (V-alloy, SiC/SiC, ODS-RAFM etc.). A staged development is planned corresponding to the three decision-making points (DPs), DP1: Intermediate check and review (C&R), DP2: Decision of transition of research and development (R&D) focus to DEMO, and DP3: Decision of DEMO construction. The near-term D-Li neutron source (A-FNS) and IFMIF are regarded as key facilities for the development. The strategy emphasizes “standardization” as an important step toward DEMO design qualification and licensing. The procedure to standard materials specifications by way of establishing structural design criteria and materials property requirements, and the procedure’s interaction with the schedule of irradiation data acquisition are discussed.journal articl
Transformation super plasticity deformation of reduced activation ferritic/martensitic steel
No full text0000-0001-9016-2318Reduced Activation Ferritic/Martensitic (RAFM) steel is a promising candidate for the blanket structural materials of fusion reactors. One of the key issues in the use of RAFM for the blanket is its low workability. As a solution of this issue, innovative processing technology based on the transformation super plasticity (TSP) was proposed. In general, TSP is known as high temperature creep deformation which is induced by phase transformation. In this study, tensile tests under constant load were carried out with cyclic temperature variation for a RAFM steel to investigate the effect of cyclic temperature variations on elongation. The result of the tensile test under constant load for the RAFM steel with cyclic temperature variations exhibited a macro-elongation to 172%. The results of the tensile tests with varying loads showed the possibility of reducing the necessary time and enhancing the controllability for the formation of RAFM steel products using TSP.journal articl
Can ChatGPT Be Considered an Author of a Medical Article?
No full textKazuki Ide, Philip Hawke, Takeo Nakayama, Can ChatGPT Be Considered an Author of a Medical Article?, Journal of Epidemiology, 2023, Volume 33, Issue 7, Pages 381-382, Released on J-STAGE July 05, 2023, Advance online publication April 08, 2023, Online ISSN 1349-9092, Print ISSN 0917-5040, https://doi.org/10.2188/jea.JE20230030, https://www.jstage.jst.go.jp/article/jea/33/7/33_JE20230030/_article/-char/e
Users′ perspective on D-Li neutron sources (A-FNS and IFMIF-DONES) for DEMO and beyond
No full textA-FNS and IFMIF-DONES neutron source program in Japan and in the EU, respectively, are advancing targeting on the start of operation in ∼2030. These facilities will play a central function in realizing DEMO. This paper will discuss the role of the materials scientists, as the users, in A-FNS and IFMIF-DONES programs in order to encourage them to enhance their commitment to the programs. The past collaborations by the materials scientists and the designers in the IFMIF project are introduced first. Then the roles of the neutron sources in the DEMO-roadmap are discussed, for which materials scientists are requested to take leadership. This paper also emphasizes the need for development of advanced materials and for obtaining fundamental understanding on fusion neutron radiation effects by application of the neutron sources.journal articl
Moderation of Negative Oxygen Effects by Small Yttrium Addition to Low Activation Vanadium Alloys
No full text0000-0001-6564-8922In order to improve irradiation embrittlement of vanadium alloys for fusion reactors, yttrium (Y) has been added reducing the interstitial oxygen impurity. However Y addition can also degrade high-temperature strength, because Y could scavenge oxygen in solid solution, which is a strong hardening agent in vanadium alloys. In this study, the effect of Y addition and oxygen level on the mechanical properties was investigated from the view points of both the high-temperature strength and low temperature ductility. Y addition was suggested to moderate the hardening and embrittlement induced by oxygen impurity sustaining the high-temperature strength within an acceptable level.journal articl
Paepalanthus strictus Koern.
No full textPaepalanthus strictus Koern. in Martius & Eichler, Fl. Bras. 3(1): 319 (1863) ≡ Dupatya stricta (Koern.) Kuntze, Revis. Gen. Pl. 2: 746 (1891). Type: BRAZIL. Minas Gerais: “Crescenti in prov. Minarum”, s.d., Gardner 5258 (lectotype, here designated: B!, duplicates: G!, P!). Koernicke (1963) described Paepalanthus strictus based on two collections. The specimen Gardner 5258 in B is more complete and contains annotations by the author, thus is here designated as the lectotype.Published as part of Trovó, Marcelo & Sano, Paulo Takeo, 2010, Taxonomic survey of Paepalanthus section Diphyomene (Eriocaulaceae), pp. 49-55 in Phytotaxa 14 on page 54, DOI: 10.11646/phytotaxa.14.1.4, http://zenodo.org/record/477875
Brass-texture induced grain structure evolution in room temperature rolled ODS copper
No full textCurrently, advanced ODS copper alloy is under study as a potential fusion material providing good mechanical properties. In this work, in order to develop a high performance ODS copper containing 0.5 wt% Y2O3 oxide particles, the effect of room temperature rolling and subsequent annealing on the grain structure evolution, texture development and tensile properties are studied using EBSD, TEM and tensile tests. Microstructure evolution studies show the grain structure coarsens by enhancing the Brass texture during increase of rolling reduction and a unique single crystal-like brass-texture deformed structure is achieved after 80% rolling reduction. We found the deformation mechanism of partial slip by a/2 211 dislocations facilitated by the pinning of a/2 101 perfect dislocations through fine oxide particles is responsible for formation of Brass texture during room temperature rolling. Furthermore, the recrystallization of ODS copper retards to high temperature of similar to 700 degrees C and shows a fine-grained microstructure with different orientations of Goss, Brass, S and Copper. Evaluation of microstructure-mechanical properties of the recrystallized samples expresses that the bimodal grain size distribution at 800 degrees C for 30 min offers a good tensile strength-ductility (UTS: 491 MPa, el(t): 19%) at ambient temperature
Periprosthetic acetabular bone loss using a constrained acetabular component
No full textThis is the author-created version of Springer, Ito, Hiroshi ; Matsuno, Takeo,Archives of Orthopaedic and Trauma Surgery, 124(2), 2004, 137-139. The original publication is available at www.springerlink.com.
authorWe describe two patients with a constrained acetabular component who required treatment for recurrent dislocation showing postoperative periprosthetic acetabular bone loss. These hips required revision surgery and demonstrated considerable bone loss caused by the migrated acetabular component. Impingement may have occurred with increased stress at the bone-prosthesis interface, and the sharp ends of screws with a metal shell may have gradually plowed up the acetabular bone. These failures illustrate the potential risk of using a constrained acetabular component
Japanese Fusion Materials Development Path to DEMO
No full textThis paper reports Japanese strategy for developing blanket structural materials for DEMO. In the Japanese program, the candidate materials are categorized into Primary Option (RAFM) and Advanced Options (V-alloy, SiC/SiC, ODS-RAFM etc.). A staged development is planned corresponding to the three decision-making points (DPs), DP1: Intermediate check and review (C&R), DP2: Decision of transition of research and development (R&D) focus to DEMO, and DP3: Decision of DEMO construction. The near-term D-Li neutron source (A-FNS) and IFMIF are regarded as key facilities for the development. The strategy emphasizes “standardization” as an important step toward DEMO design qualification and licensing. The procedure to standard materials specifications by way of establishing structural design criteria and materials property requirements, and the procedure’s interaction with the schedule of irradiation data acquisition are discussed
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