13 Works

Reduction of the Ordered Magnetic Moment by Quantum Fluctuation in the Antiferromagnetic Spin-5 2 Dimer Compound FeVMoO7

Masashi Hase, James R. Hester, Kirrily C. Rule, Vladimir Yu. Pomjakushin, Akira Matsuo & Koichi Kindo
We investigated the magnetism of FeVMoO7 by performing magnetization, specific heat, electron spin resonance, and neutron diffraction experiments. We observed an antiferromagnetically ordered state below T_N = 10.8 K. We consider that the probable spin model is an interacting antiferromagnetic spin-5/2 dimer model where spin dimers are connected by interdimer interactions. The intradimer interaction was evaluated to be J = 10.5 +- 0.5 K. The magnitude of ordered magnetic moments is 4.00(7) mu_B at 4...

Materials Data Platform overview: metadata, vocabulary, and repository

mikiko tanifuji
The development of advanced materials inherently rests on access to a distributed materials infrastructure and materials research data to fuel discovery and innovation. RDA aims to accelerate and facilitate research data sharing and exchange. Similarly, CODATA works to strengthen international science for the benefit of society by promoting improved scientific and technical data management and use. Given these complementary missions, this RDA IG and the CODATA TG will work together under the following statement in...

Calculations of Electron Inelastic Mean Free Paths. XI. Data for Liquid Water for Energies from 50 eV to 30 keV

Hiroshi SHINOTSUKA, Bo DA, Shigeo Tanuma, Hideki YOSHIKAWA, Cedric Powell & David R. Penn
We calculated electron inelastic mean free paths (IMFPs) for liquid water from its optical energy-loss function (ELF) for electron energies from 50 eV to 30 keV. These calculations were made with the relativistic full Penn algorithm (FPA) that has been used for previous IMFP and electron stopping-power calculations for many elemental solids. We also calculated IMFPs of water with three additional algorithms: the relativistic single-pole approximation (SPA), the relativistic simplified SPA, and the relativistic extended...

Automatic Experimental Data Collection System Using a Wireless LAN Capable SD Card as an IoT Device

Asahiko Matsuda, Hideki YOSHIKAWA & Toyohiro Chikyow
実験・計算・データ科学を融合させた材料の研究開発を推進するマテリアルズインフォマティクス(MI)が推進されているが、実験データの収集については既存データベースのインポートや出版済み論文のデータマイニングに限られる場合が多い。効果的な MI のためには各種装置から自動的に実験データを収集し、整理して蓄積するシステムを構築することが求められる。しかし実験装置に直接接続されて装置制御・データ記録を行う PC は、情報セキュリティや安定性・互換性の観点から、ネットワークから物理的に分離されて運用される場合が多い。そこで我々は、単体で無線 LAN 接続機能を備える市販 SD カード(東芝メモリ FlashAir)を IoT デバイスとして活用し、装置 PC 自体をネットワークに接続することなく実験データを自動転送するシステムを構築した。同カードはデータの書き込みイベントをきっかけとして任意の Lua スクリプトを実行できる機能を有しており、セキュアな接続でサーバにデータを送信することができる。カードごとに異なるアクセストークンを事前にカード内に保存し、新しくカードに書き込まれたデータをサーバに転送するようにした。データはサーバ上で実験装置ごとに設定されたアルゴリズムにより利用価値の高いデータとなるよう整形され、蓄積される。このシステムを、X線光電子分光装置の測定データやコンビナトリアル成膜装置のマスク制御状態や温度・真空度・膜厚などのセンサーデータを自動的に収集できるように展開した事例を紹介する。この仕組みにより、実験データの効率的な収集と高付加価値化が実現できたことに加え、従来の USB メモリを用いた転送方法で問題となっていた装置PCへのマルウェア感染リスクも低減することができた。 謝辞 本システムは(株)東芝および東芝情報システム(株)のご協力のもと構築された。

Data management and adoption of the FAIR principle; perspective from a research institution

mikiko tanifuji
オープンサイエンスに関する各種ポリシーやガイドラインが整備されつつある中で、研究ワークフローの形成と共に進む研究データの利活用に関するFAIR原則(Findable, Accessible, Interoperable and Reusable)への取り組みを、材料データプラットフォーム構築を例に紹介する。

Future perspective of DOI tracking - influence of science

mikiko tanifuji
At the 2017 Library Fair, Professor Syun Tutiya moderated a session involving all three partners in the CHORUS trial with JST and Chiba University. CHORUS is a not-for-profit, membership organization established in 2015 as a global service to monitor research output and open access. Since 2017 JST has become a CHORUS funder partner and seven institutions including Chiba University are subscribing. This session will explore the potential for a wider JST/CHORUS open-science framework in Japan’s...

Calculations of Mean Escape Depths of Photoelectrons in Elemental Solids Excited by Linearly Polarized X-rays for High-Energy Photoelectron Spectroscopy

Shigeo Tanuma, Hideki YOSHIKAWA, Hiroshi SHINOTSUKA & Ryuichi Ueda
We have calculated mean escape depths (MEDs, D) of photoelectrons from Si, Cu, and Au excited by linearly polarized X-rays over the 50 to 10,000 eV energy range for high -energy photoelectron spectroscopy. These calculations were done with Monte Carlo methods using the values of electron inelastic mean free paths λ that were calculated by the relativistic full Penn algorithm and the Dirac-Hartree-Fock atomic potential for elastic scattering of electrons. In order to know the...

物質・材料研究データの探しやすさ

Asahiko Matsuda
材料研究は物理学・化学・工学に基づいた応用寄りの学問であり、研究者のディスカバリーサービスに対する期待もその特徴を反映する。材料データは産業的応用との兼ね合いや知的財産的な事情により制限公開・制限共有であることが多く、データの即時入手ができなくてもその存在は発見でき次のステップに進めるようなワンストップのサービスが理想像である。また最近はデータ駆動型のアプローチが広まっており、このとき材料学特有のメタデータの取り扱いが課題になる。NIMSが材料データプラットフォームDICEを構築する際に共通メタデータをデザインしたが、研究者の興味対象になるメタデータほど標準化・共通化が難しいことがわかった。共通スキーマに含めきれないメタデータを収める方策は、Schema.orgを拡張したフォーマットによるファイル管理を含め検討が続いており、学際的なつながりを志向する機関・サービスと各専門家・専門機関との連携が重要になる。

Summary of ISO/TC 201 Standard: XX ISO 18118: 2004 — Surface chemical analysis — Auger electron spectroscopy and X-ray photoelectron spectroscopy —Guide to the use of experimentally determined relative sensitivity factors for the quantitative analysis of homogeneous materials

Shigeo Tanuma
ISO 18118 provides guidance on the measurement and use of experimentally determined relative sensitivity factors for the quantitative analysis of homogeneous materials by Auger electron spectroscopy and X-ray photoelectron spectroscopy. This article provides a brief summary of this International Standard.

Calculations of electron inelastic mean free paths. XII. Data for 42 inorganic compounds over the 50 eV to 200 keV range with the full Penn algorithm

Hiroshi SHINOTSUKA, Shigeo Tanuma, Cedric Powell & David R. Penn
We have calculated inelastic mean free paths (IMFPs) for 42 inorganic compounds (AgBr, AgCl, AgI, Al2O3, AlAs, AlN, AlSb, cubic BN, hexagonal BN, CdS, CdSe, CdTe, GaAs, GaN, GaP, GaSb, GaSe, InAs, InP, InSb, KBr, KCl, MgF2, MgO, NaCl, NbC0.712, NbC0.844, NbC0.93, PbS, PbSe, PbTe, SiC, SiO2, SnTe, TiC0.7, TiC0.95, VC0.76, VC0.86, Y3Al5O12, ZnS, ZnSe, and ZnTe) for electron energies from 50 eV to 200 keV. These calculations were made with energy-loss functions (ELFs) obtained...

G-Quadruplex Structure Improves the Immunostimulatory Effects of CpG Oligonucleotides

Kazuaki Hoshi, TOMOHIKO YAMAZAKI, Yuuki Sugiyama, Kaori Tsukakoshi, Wakako Tsugawa, Koji Sode & Kazunori Ikebukuro
Single-strand oligodeoxynucleotides (ODNs) containing unmethylated cytosine-phosphate-guanine (CpG) are recognized by the toll-like receptor 9, a component of the innate immunity. Therefore, they could act as immunotherapeutic agents. Chemically modified CpG ODNs containing a phosphorothioate backbone instead of phosphodiester (PD) were developed as immunotherapeutic agents resistant to nuclease degradation. However, they cause adverse side effects, and so there is a necessity to generate novel CpG ODNs. In the present study, we designed a nuclease-resistant nonmodified CpG...

A Possible Magnetic Structure of the Cluster-Based Haldane Compound Fedotovite K2Cu3O(SO4)3

Masashi Hase, Kirrily C. Rule, James R. Hester, Jaime A. Fernandez-Baca, Takatsugu Masuda & Yukari Matsuo
We carried out neutron powder diffraction experiments on the cluster-based Haldane compound fedotovite K2Cu3O(SO4)3. Weak magnetic reflections caused by a magnetic long-range order appeared below an antiferromagnetic transition temperature TN =3.1 K. We propose a possible magnetic structure that is consistent with the magnetic properties reported in the literature.

NIMSʼs Materials Data Platform DICE and its future direction

Asahiko Matsuda, Takuya Kadohira & Masahiko Demura
To promote data-driven research in the materials science field, the National Institute for Materials Science has been developing a materials data platform system since 2017, and started operating it as "DICE" in 2020. In this presentation, we will describe its functionalities, some of the developments so far, and potential avenues for future cooperation and collaboration.

Registration Year

  • 2022
    1
  • 2021
    12

Resource Types

  • Text
    13

Affiliations

  • National Institute for Materials Science
    13
  • University of Tokyo
    2
  • Australian Nuclear Science and Technology Organisation
    2
  • National Institute of Standards and Technology
    2
  • Hosei University
    1
  • Tokyo University of Agriculture and Technology
    1
  • University of North Carolina at Chapel Hill
    1
  • Oak Ridge National Laboratory
    1
  • Paul Scherrer Institute
    1
  • North Carolina State University
    1