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First-principles calculation of phase equilibria and phase separation of the Fe-Ni alloy system

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Rare Metals 2006年第5期25卷 437-440页

作者： Ying Chen shuichi iwata Tetsuo Mohri Department of Quantum Engineering and System Science School of Engineering The University of Tokyo Hongo 7-3-1 Bunkyo-ku Tokyo113-8656 Japan Graduate School of Frontier Sciences The University of Tokyo Hongo 7-3-1 Bunkyo-ku Tokyo 113-8656 Japan Division of Materials Science and Engineering Graduate School of Engineering Hokkaido University Kita-13 Nishi-8 Kita-ku Sapporo060-8628 Japan

Theoretical investigation of the phase equilibria of the Fe-Ni alloy has been performed by combining the FLAPW total energy calculations and the Cluster Variation Method through the Cluster Expansion Method. The calculations have proved the stabilization of the LIE phase at 1：3 stoichiometry, which is in agreement with the experimental result, and predicted the existence of L1 0 as a stable phase below 550 K; this L1 0 phase has been missing in the conventional phase diagram. The calculations are extended to the Fe-rich region that is characterized by a wide range phase separation and has drawn considerable attention because of the intriguing Invar property associated with a Fe concentration of 65%. To reveal the origin of the phase separation, a P-V curve in an entire concentration range is derived by the second derivative of free energy functional of the disordered phase with respect to the volume. The calculation confirmed that the phase separation is caused by the breakdown of the mechanical-stability criterion. The newly calculated phase separation line combined with the L1 0 and L12Eorder-disordered phase boundaries provides phase equilibria in the wider concentration range of the system. Furthermore, a coefficient of thermal expansion （CTE） is attempted by incorporating the thermal vibration effect through harmonic approximation of the Debye-Gruneisen model. The Invar behavior has been reproduced, and the origin of this anomalous volume change has been discussed.

关键词： Fe-Ni alloy system order-disorder separation magnetism first-principles calculations cluster variation method cluster expansion method Debye-Gruneisen model

How to work together for engineering materials!

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Materials Genome Engineering Advances 2023年第2期1卷 7-24页

作者： shuichi iwata University of Science and Technology Beijing BeijingChina

To share and utilize data effectively for collaborative work,a common understanding of the knowledge behind the data,including its context and meaning,is a fundamental *** paper focuses on the gaps that hinder common understanding between the real world and the data space,acting as barriers between systems,organizations,data spaces,and *** understand the core reasons and devise strategies for bridging the gap,the author has endeavored to synthesize a case study of material data activities from two perspectives:diachronic and synchronic,which is framed into a two-step process,involving the establishment of intersubjectivity among experts and interobjectivity among materials/substances *** a result,the author has formulated an action plan for the digitization of engineering materials,encompassing tacit knowledge,know-how,and intellectual property rights to establish a foundation for their use with traceability,interoperability,and *** order to create a conceptual framework that enhances a productive ecosystem facilitated by networked materials and substance databases,this plan is conclusively based on two key steps:fostering interactions among experts rooted in substances and materials and standardizing digitized data related to substances/materials based on their geospatial structural information.

关键词： data activity data and reality data model engineering materials interobjectivity intersubjectivity metadata metamodel

An Interface“Virtual Production Line”for Material Design

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计算机与应用化学 1995年第2期 151-151页

作者： shuichi iwata(Research into Artifacts,Center for Engineering, The University of Tokyo)

ＡｎＩｎｔｅｒｆａｃｅ“ＶｉｒｔｕａｌＰｒｏｄｕｃｔｉｏｎＬｉｎｅ”ｆｏｒＭａｔｅｒｉａｌＤｅｓｉｇｎ￥ＳｈｕｉｃｈｉＩｗａｔａ（ＲｅｓｅａｒｃｈｉｎｔｏＡｒｔｉｆａｃｔｓ，ＣｅｎｔｅｒｆｏｒＥｎｇｉｎｅｅｒｉｎｇ，... 详细信息

ＡｎＩｎｔｅｒｆａｃｅ“ＶｉｒｔｕａｌＰｒｏｄｕｃｔｉｏｎＬｉｎｅ”ｆｏｒＭａｔｅｒｉａｌＤｅｓｉｇｎ￥ＳｈｕｉｃｈｉＩｗａｔａ（ＲｅｓｅａｒｃｈｉｎｔｏＡｒｔｉｆａｃｔｓ，ＣｅｎｔｅｒｆｏｒＥｎｇｉｎｅｅｒｉｎｇ，ＴｈｅＵｎｉｖｅｒｓｉｔｙｏｆＴｏ...

关键词：炮

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材料基因工程数据生态系统

中国材料进展 2023年第2期42卷 135-143页

作者：尹海清王永伟张晓彤姜雪黄海友张雷岩田修一宋晓艳张洪梅姚磊江崔丽娜周勇陈宁曲选辉北京科技大学北京材料基因工程高精尖创新中心北京100083 北京科技大学钢铁共性技术协同创新中心北京100083 日本东京大学理学部东京113-8654 北京工业大学材料科学与工程学院北京100124 北京理工大学材料学院北京100081 西北工业大学无人机特种技术国防科技重点实验室陕西西安710129 中国科学院金属研究所沈阳材料科学重点实验室辽宁沈阳110016 中国科学院化学研究所中国科学院工程塑料重点实验室北京100190

在全球数字化飞速发展的时代,互联网、物联网和计算机技术使数据的获取、存储和分析变得非常高效便捷。数据科学作为科学发现的第四范式,进一步加快了数据在科学研究中的应用。政府、企业、科研院所甚至个人都积累了大量数据,越来越多... 详细信息

在全球数字化飞速发展的时代,互联网、物联网和计算机技术使数据的获取、存储和分析变得非常高效便捷。数据科学作为科学发现的第四范式,进一步加快了数据在科学研究中的应用。政府、企业、科研院所甚至个人都积累了大量数据,越来越多的人充分认识到数据对社会经济和科技的推动作用,因此对数据生态系统的需求应运而生,需要从全生命周期的角度来构建从数据的生产到输出、应用的全过程的生态系统。对材料数据生态系统的七要素:材料数据分类、材料数据标准、数据采集、数据存储、材料数据知识产权保护、数据质量管控以及材料数据库的重要性和最新进展进行论述,描述了材料基因工程数据生态系统的建设情况。

关键词：数据分类数据标准数据知识产权数据生态系统材料基因工程全生命周期

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Japanese Perspectives on Nutrition for New Millenium

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Biomedical and Environmental Sciences 2001年第1期14卷 82-86页

作者： shuichi KIMURA ShowaWomen’sUniversity ILSI1_7TaishdoSetaguyaku

The Japanese are the longest living people in the world. According to Japan's Ministry of Health and Welfare, the average life expectancy at birth for male born in 1997 was 77.10 years, and the figure for female was 83.99 years.　　Our country is ranked first in the Healthy Life Expectancy as shown in Table 1. The total Disability Adjusted Life Expectancy (DALE) is 74.5 years.

关键词： Nutrition Nutrition Policy Public Health Demography Humans Japan Life Expectancy Public Policy Social Conditions

Dissipative structure for symmetric hyperbolic systems with memory

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Science China Mathematics 2018年第11期61卷 2053-2064页

作者： shuichi Kawashima Shogo Taniue Faculty of Mathematics Kyushu University Graduate School of Mathematics Kyushu University

We study symmetric hyperbolic systems with memory-type dissipation and investigate their dissipative *** treat two cases:memory-type diffusion and memory-type relaxation,and observe that the dissipative structures of these two cases are essentially ***,we show that the dissipative structure of the system with memory-type diffusion is of the standard type,while that of the system with memory-type relaxation is of the regularity-loss type.

关键词： hyperbolic systems memory-type dissipation dissipative structure

Experimental Study on Load Characteristics in a Floating Type Pendulum Wave Energy Converter

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Journal of Thermal Science 2014年第5期23卷 465-471页

作者： Tengen Murakami Yasutaka Imai shuichi Nagata Institute of Ocean Energy Saga University

A floating type pendulum wave energy converter(FPWEC) with a rotary vane pump as the power take-off system was proposed by Watabe et *** *** showed that this device had high energy conversion *** the previous research,the authors conducted 2D wave tank tests in regular waves to evaluate the generating efficiency of FPWEC with a power take-off system composed of pulleys,belts and a *** a result,the influence of the electrical load on the generating efficiency was ***,the load characteristics of FPWEC are pursued experimentally by using the servo motors to change the damping coefficient in this *** a later part of this paper,the motions of the model with the servo motors are compared with that of the case with the same power take-off system as the previous *** the above experiment,it may be concluded that the maximum primary conversion efficiency is achieved as high as 98%at the optimal load.

关键词： pendulum wave energy converter floating type load characteristics primary conversion efficiency

Origami Folding by Multifingered Hands with Motion Primitives

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Cyborg and Bionic Systems 2021年第1期2021卷 169-183页

作者： Akio Namiki shuichi Yokosawa Graduate School of Engineering Chiba UniversityChibaJapan

Origami,a traditional Japanese art,is an example of superior handwork produced by human *** such extreme dexterity is one of the goals of robotic *** the work described in this paper,we developed a new general-purpose robot system with sufficient capabilities for performing *** decomposed the complex folding motions into simple primitives and generated the overall motion as a combination of these ***,to measure the paper deformation in real-time,we built an estimator using a physical simulator and a depth *** a result,our experimental system achieved consecutive valley folds and a squash fold.

关键词： robot primitive system

Electron Temperature Measurement by Floating Probe Method Using AC Voltage

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Plasma Science and Technology 2016年第11期18卷 1089-1094页

作者： Satoshi NODOMI shuichi SATO Mikio OHUCHI Department of Electrical and Electronic Engineering Tokyo Denki University

This study presents a novel floating probe method to measure electron temperatures using a hollow cathode-type discharge tube. The proposed method detects a shift in the floating potential when an AC voltage is applied to a probe through an intermediary blocking capacitor. The shift in the floating potential is described as a function of the electron temperature and the applied AC voltage. The floating probe method is simpler than the Langmuir probe method because it does not require the measurement of volt-ampere characteristics. As the input AC voltage increases, the electron temperature converges. The electron temperature measured using the floating probe method with an applied sinusoidal voltage shows a value close to the first （tail） electron temperature in the range of the floating potential.

关键词： electrostatic probe Langmuir probe floating potential electron temperature sheath