Researcher Database

（Last updated : 2022-05-19 10:40:03）

KASHIWAKURA SHUNSUKE

Department / Course College of Science and Engineering Department of Mechanical Engineering

Title / Position Lecturer

Other Affiliations
1.	Graduate School of Science and Engineering

Academic background
1.	2010/03 Degree Acquisition	│ Tohoku University Ph.D (Environmental Science)
2.	～2005/03	Department of Metallurgy │ School of Engineering │ Tohoku Univresity │ Graduated
3.	～2010/03	Doctorial Course │ Environmental Studies │ Environmental Studies │ Graduate School, Tohoku University │ Completed

Business career
1.	2020/04/01	Lecturer │ Department of Mechanical Engineering, │ Ritsumeikan University ,
2.	2010/05/01 ～ 2020/03/31	Assistant Professor │ Institute for Materials Research, │ Tohoku University,

Research activities
1.		Japanese LIBS Community, J-LIBS
2.		The iron and steel Institute of Japan

Subject of research
1.	High-speed sorting of various metal materials using laser-induced breakdown spectroscopy and machine learning

Research summary
High-speed sorting of various metal materials using laser-induced breakdown spectroscopy and machine learning The need for the formation of a sustainable circular society is shared worldwide, as symbolized by the fact that Article 12 of the SDGs (Sustainable Development Goals), a set of United Nations targets for 2030, clearly states "ensuring sustainable consumption and production patterns". In Japan, the fourth basic plan based on the Basic Act on the Formation of a Sound Material-Cycle Society was announced in 2018, and industry, academia, and government are working together to promote the formation of a recycling-oriented society. 　The recycling of various metal materials has been actively promoted by each industrial group, and steel, for example, is considered to be an excellent example of recycling and its recycling rate is over 90%. For this reason, ferritic stainless steel, which is widely used for commodity applications such as automobiles and home appliances, is often recycled as ordinary steel because it is lumped together with ordinary steel in the magnetic field separation process, and the chromium originally contained in it is not effectively utilized. In order to solve this problem, it is necessary to develop a new sorting technology based on the information of elements, which is one of the mainstream sorting methods in Japan at present. 　Laser-induced breakdown spectroscopy (LIBS) is a technique for qualitative and quantitative analysis of elements by measuring the excitation and de-excitation light of target atoms taken up by ablation in the laser-induced plasma induced by breakdown (electron avalanche) by a high-peak laser pulse. The LIBS spectrum is extremely fast, capable of making dozens of measurements per second, and is extremely compatible with machine learning for pattern recognition, since all of the unique patterns of various metallic materials are typically represented by row vectors. 　Many heat-resistant steels used in automobiles have special compositions such as SUSXM15J1 (18Cr-13Ni-4Si), SUS436J1L (19Cr-0.5Mo-Nb), and SUH446 (25Cr). The goal of this study is to classify these steels precisely by combining LIBS and machine learning so that they can be used as raw materials in the manufacturing process of each heat-resistant steel.

Present specialized field
Environmental impact assessment, Environmental engineering and reduction of environmental burden, Environmental conscious materials and recycle, Design and evaluation of sustainable and environmental conscious system, Computational science, Metal making/Resorce production engineering (Keyword：Materials Circulation Recycle System Rapid Sorting)

Papers
1.	2020/12/31	Evaluating influences of impurities on hydrogen production in the reaction of Si with water using Si sludge │ International Journal of Hydrogen Energy │ (Co-authored)
2.	2020/10/23	Effect of Plasma Gas and the Pressure on Spatially and Temporally Resolved Images of Copper Emission Lines in Laser Induced Plasma Optical Emission Spectrometry │ 37 (2),pp.367-375 (Co-authored)
3.	2020/07/29	Quantitative Analysis of Hydrogen in High-Hydrogen-Content Material of Magnesium Hydride via Laser-Induced Breakdown Spectroscopy │ 92 (16),pp.11171-11176 (Co-authored)
4.	2020/07/24	Rapid detection of inclusion particles in recycled aluminum materials by laser-induced plasma optical emission spectrometry with scanning laser beam │ Surfaces and Interfaces │ 20,pp.100602 (Co-authored)
5.	2020/07/24	Uncertainty of the Analytical Values in Laser-induced Plasma Optical Emission Spectrometry for Element-based Sorting of Commercial Aluminum Alloys │ Analytical Sciences │ 36 (11),pp.1415-1421 (Co-authored)
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Grants-in-Aid for Scientific Research -KAKENHI-
1.	2018/04 ～ 2020/03	Laser Plasma Control by Short/Long Pulse Coaxial Dropping for Metal Scrap Sorting
2.	2013/04 ～ 2015/03	Development of radioisotope distribution, morphology and removal technology in soil in the Tohoku region
3.	2011/04 ～ 2013/03	Elution behavior and solid-liquid distribution behavior of rare earths in coal fly ash

Competitive grants, etc. (exc. KAKENHI)
1.	2013/04 ～ 2015/03	Iron scrap sorting system by composition using laser-induced plasma emission spectrometry │ Research by External Competitive Fund
2.	2010/10 ～ 2011/09	Development of a process to recover rare earths from coal fly ash │ Research by External Competitive Fund │ Steel Foundation for Environmental Protection Technology

Message
1.	All At Once The important thing to consider when recycling is 1. find out what recycling is good for 2. develop technology to make the form easy to recycle and technology to separate Understand in advance how much of an advantage/disadvantage recycling will create. These are the three points above, and we always keep them in mind when developing sorting technology with the construction of a recycling-oriented society in mind.