Mar. 2025, 2025年 日本金属学会春期講演大会 第44回優秀ポスター賞（学生受賞）, 日本金属学会
小澤杏佳、西場穂佳、工藤直人、阿部龍清、西 剛史、太田 弘道、池田輝之

Oct. 2024, 2024年度年次講演会優秀講演賞（学生受賞）, 日本実験力学会
工藤直人

Mar. 2024, 日本金属学会 第42回ポスターセッション,優秀ポスター賞（学生受賞）, 最適なFAST材料探索のための熱浸透率測定, 日本金属学会
茨城大学 西場 穂佳、河野 紗佳、池田 輝之、西 剛史、太田 弘道
Japan society

Mar. 2024, 日本金属学会 第42回ポスターセッション,優秀ポスター賞（学生受賞）, るつぼ回転粘度計を用いた溶融球状黒鉛鋳鉄(FCD)の粘度測定, 日本金属学会
茨城大学 山本 泰生、西 剛史、太田 弘道
Japan society

Sep. 2023, 日本鉄鋼協会 第186回秋季講演大会 学生ポスターセッション「奨励賞」（学生受賞）, R2O-Al2O3-SiO2(R=Li, Na, K)融体の熱伝導率評価, 日本鉄鋼協会
Japan society

Aug. 2023, 日本実験力学会技術賞, オフセット周期加熱法による一方向炭素繊維複合材料の熱拡散率特性評価, 日本実験力学会
永田 將、三宅修吾、五十嵐誉廣、太田弘道、西 剛史
International academic award

Mar. 2023, 日本金属学会 第40回ポスターセッション,優秀ポスター賞（学生受賞）, 熱物性顕微鏡を用いた模擬月砂の熱浸透率分布測定, 日本金属学会
茨城大学 工藤 直人、菅沼 友仁、西 剛史、太田 弘道;宇宙航空研究開発機構 太刀川 純考;芝浦工業大学 渡辺 俊介、遠藤 理恵
Japan society

Nov. 2021, 日本原子力研究開発機構 理事長表彰 研究開発功績賞

Mar. 2020, 2019年度日本原子力学会フェロー賞（学生受賞）

2019, 第33回 日本金属学会 優秀ポスター賞（学生受賞）

2018, 第13回(平成29年度)日本原子力学会 再処理・リサイクル部会賞 業績賞
Official journal

2016, 第26回 日本金属学会 優秀ポスター賞（学生受賞）
Japan society

2016, JNST Most Popular Article Award 2015

2015, 第47回 日本原子力学会賞 論文賞

2014, 平成２６年度 科学技術分野の文部科学大臣表彰 若手科学者賞

2012, 日本原子力研究開発機構 理事長表彰 研究開発功績賞

2012, 第44回 日本原子力学会賞 論文賞

2005, 日本金属学会 第2回若手講演論文賞

Replication of Interfacial Thermal Resistance between Blackening Layer and Sample by a Laser Spot Periodic Heating Radiation Thermometry Method with Finite Element Method　　　　　　　　　　　　　　　
Seiichiro SANDOH; Hiromichi OHTA; Tsuyoshi NISHI, Last
Journal of JSEM, Mar. 2025, [Reviewed]

Specific Heat Measurement of Luner Regolith Simulants by using Temperature-Modulated Differential Scanning Calorimetry　　　　　　　　　　　　　　　
Yuna NAKAYAMA; Naoto KUDO; Naoki KUROIWA; Rie ENDO; Hiromichi OHTA; Tsuyoshi NISHI, Last
Journal of JSEM, Mar. 2025, [Reviewed]

Thermal Conductivities of BaTiO3/epoxy Composite　　　　　　　　　　　　　　　
Tsuyoshi NISHI; Satoru NISHIWAKI; Hiromichi OHTA; Chihiro IWAMOTO; Kotaro MORI, Lead
Journal of JSEM, Mar. 2025, [Reviewed]

Thermophysical Properties of High-Temperture Melts and Materials Processing　　　　　　　　　　　　　　　
Tsuyoshi Nishi; Manabu Watanabe, Lead
Netsu Bussei, Mar. 2025

Thermal conductivity of lunar regolith simulant using a thermal microscope
Naoto Kudo; Shunsuke Watanabe; Tsuyoshi Nishi; Hiromichi Ohta; Sumitaka Tachikawa; Rie Endo, Abstract

In this study, thermal effusivity distributions of two polished JSC-1A particles, a lunar regolith-simulating material, were measured using a thermal microscope. The results confirmed that the average thermal effusivity of the JSC-1A single particle was approximately half that of the FJS-1 single particle, a different type of lunar regolith-simulating material measured by a similar method. Also, the thermal effusivities of the existing mineral phases of pyroxene and anorthite in the particles were obtained and were comparable to those reported in the literature. A possible reason for the lower thermal conductivity of JSC-1A than that of FJS-1 could be the differences in the ratio of the mineral phases, and phase boundaries between the mineral phases., Walter de Gruyter GmbH
High Temperature Materials and Processes, 01 Jan. 2025

Dominant factors of thermal conduction in alkali silicate glasses and melts: A molecular dynamics study
Yuma Noguchi; Masahiro Shimizu; Sohei Sukenaga; Rie Endo; Tsuyoshi Nishi; Yasuhiko Shimotsuma; Kiyotaka Miura, Abstract

As representative compositions of the mold flux used in the continuous casting of steel, the temperature and composition dependence of the thermal conductivity of alkali silicate glasses and melts was investigated in the range of 300–1700 K using molecular dynamics (MD) simulations. MD simulations can exclude disturbances such as radiation, convection, and impurities, and extract only the effect of phonons on the thermal conduction. Thermal conductivity determined by the laser flash (LF) method was reported to be three times higher than that obtained by the unsteady hot wire (HW) method in the high‐temperature range of 1250–1550 K for 33.3Na₂O–66.7SiO₂ (mol%). This study shows that (1) the thermal conductivity estimated by MD simulations was closer to the experimental value of the LF method than those of the HW method above 1200 K, which suggests that the LF method is reliable and that the effect of radiation on the thermal conductivity is not significant. (2) The decrease in the thermal conductivity measured by the LF method in the range of 1250–1550 K was attributed to the decrease in the bulk modulus of the 33.3Na₂O–66.7SiO₂ melt. (3) In a series of Na₂O–SiO₂ melts, the sound velocity calculated by MD decreased with increasing Na₂O content, which is consistent with Shiraishi's ultrasonic wave measurements., Wiley
Journal of the American Ceramic Society, 10 Dec. 2024

カーボンニュートラルに役立つガラスの解析と設計　　　　　　　　　　　　　　　
鈴木 茂; 西 剛史
金属（アグネ技術センター）, Nov. 2024

Densities, Surface Tensions, and Viscosities of Molten High‐Silicon Electrical Steels with Different Silicon Contents
Lukas Neubert; Matheus Roberto Bellé; Taisei Yamamoto; Tsuyoshi Nishi; Hidemasa Yamano; Frank Ahrenhold; Olena Volkova, Density, surface tension, and viscosity of various liquid electrical steels are measured at different temperatures, varying in their silicon content between 3 and 6 mass%. Density and surface tension are determined using the maximum bubble pressure method, while viscosity is investigated comparatively using a vibrating finger viscometer and an oscillating crucible viscometer. The results are compared with models known from the literature. Based on this, the density of the steel [ρ] = kg m⁻³ and the surface tension [σ] = N m⁻¹ can be described as a function of temperature [θ] = °C and silicon content [Si] = mass% using the equations: , . There is a lack of experimental data in the literature for high‐temperature thermophysical properties for electrical steels. This underlines once again the novelty and significance of this study, as the determined thermophysical properties are essential for a wide range of applications. For instance, they are crucial in the production of metallic powders for additive manufacturing by atomization to adjust the properties of the powders precisely. The findings are also important for steelmaking itself, as the corrosion behavior of refractory material can be better determined., Wiley
Steel Research International, 17 Sep. 2024

Density, Surface Tension, and Viscosity of Liquid Low‐Sulfur Manganese–Boron Steel via Maximum Bubble Pressure and Oscillating Crucible Methods
Matheus Roberto Bellé; Lukas Neubert; Anastasiia Sherstneva; Taisei Yamamoto; Tsuyoshi Nishi; Hidemasa Yamano; Matthias Weinberg; Olena Volkova, In this study, the thermophysical properties of low‐sulfur manganese–boron steel with varying boron and sulfur contents at different temperatures are investigated. Density and surface tension are measured between 1550 and 1650 °C using the maximum bubble pressure method, while viscosity is examined between 1530 and 1570 °C using an improved oscillating crucible viscometer. The methods yield results with low error, consistent with existing literature. The density of the base steel decreases from 7057 ± 25 kg m⁻³ at 1550 °C to 6843 ± 85 kg m⁻³ at 1650 °C. The addition of boron (up to 57 ppm) and sulfur (up to 130 ppm) does not significantly change the density. Sulfur, increasing from 39 to 130 ppm, reduces the surface tension from 1416 ± 12 to 1302 ± 9 mN m⁻¹ at 1650 °C. Boron's effect on surface tension varies, possibly influenced by other elements like oxygen. Viscosity ranges from 5.74 to 6.44 mPa s, with boron and sulfur additions causing minimal changes, the largest deviation being 8%. In these results, valuable data for the simulation, modeling, control, and optimization of liquid steel processing are provided., Wiley
Steel Research International, 12 Sep. 2024, [Reviewed]

Density, Surface Tension, and Viscosity of Molten Ni-Based Superalloys Using the Maximum Bubble Pressure and Oscillating Crucible Methods
Tsuyoshi Nishi; Saori Matsumoto; Hidemasa Yamano; Kiichiro Hayashi; Rie Endo; Matheus Roberto Bellé; Lukas Neubert; Olena Volkova, Lead, Wiley-VCH GmbH
Steel Research International, 28 Feb. 2024, [Reviewed]

Phonon mean free path of silicate glasses: a useful parameter to distinguish between framework and nonframework cations
Sohei Sukenaga; Bunta Ozato; Yohei Onodera; Shinji Kohara; Masahiro Shimizu; Tsuyoshi Nishi; Rie Endo; Takaaki Tomai; Akira Yoko; Sakiko Kawanishi; Hiroshi Fukaya; Hiromichi Ohta; Hiroyuki Shibata, Iron and Steel Institute of Japan
ISIJ International, 2024, [Reviewed]

Quantitative thermal investigation of a fayalite particle and a Si-rich layer in oxide scale formed on steel
Y. Suganuma; S. Shinohara; Y. Inoue; T. Nishi; H. Ohta; H. Tanei; M. Susa; R. Endo, Old City Publishing
High Temperatures-High Pressures, Jun. 2023, [Reviewed]

Structural Analysis Methods for Characterizing Multicomponent Melts and Glasses Processed at High Temperatures
Shigeru Suzuki; Sohei Sukenaga; Tsuyoshi Nishi; Kozo Shinoda; Hiroyuki Shibata, ISIJ
ISIJ International, 18 May 2023, [Reviewed]

〔Major achievements〕Measurement of Exothermic Values of Casting-sleeve Materials Using an Ice Calorimeter
Hoang Nhu NGO; Tsuyoshi NISHI; Hiromichi OHTA, Corresponding, ISIJ
ISIJ International, 15 Apr. 2023, [Reviewed]

Evaluation of the calorific value of exothermic sleeve material by the adiabatic calorimeter　　　　　　　　　　　　　　　
Ngo Nhu Hoang; Tsuyoshi Nishi; Hiromichi Ohta, Corresponding, De Gruyter
High Temperature Materials and Processes, Dec. 2022, [Reviewed]

Ultra-long air- stability of n-type carbon nanotube films with low thermal conductivity and all-carbon thermoelectric generators　　　　　　　　　　　　　　　
Y. Amma; K. Miura; S. Nagata; T. Nishi; S. Miyake; K. Miyazaki; M. Takashiri
Scientific Reports, Dec. 2022, [Reviewed]

オフセット周期加熱法による一方向炭素繊維複合材料の熱拡散率特性評価　　　　　　　　　　　　　　　
永田 將、三宅修吾、五十嵐誉廣、太田弘道、西 剛史, 日本実験力学会
Journal of the Japanese Society for Experimental Mechanics, Jun. 2022, [Reviewed]

るつぼ回転粘度法による溶融Ni基合金の粘度測定　　　　　　　　　　　　　　　
松本早織、西 剛史、太田弘道、堀亜由美、林 喜一郎、山野秀将, Corresponding, 日本実験力学会
Journal of the Japanese Society for Experimental Mechanics, Jun. 2022, [Reviewed]

るつぼ回転粘度計を用いた溶融耐熱鋳鋼の粘度測定　　　　　　　　　　　　　　　
高塚祐理子、松本早織、西 剛史、太田弘道、堀亜由美、林 喜一郎、山野秀将, Corresponding, 日本実験力学会
Journal of the Japanese Society for Experimental Mechanics, Jun. 2022, [Reviewed]

Determination of Thermal Effusivity of Lunar Regolith Simulant Particle Using Thermal Microscopy
Rie Endo; Yuto Suganuma; Kazuki Endo; Tsuyoshi Nishi; Hiromichi Ohta; Sumitaka Tachikawa, This study aimed to measure the thermal effusivity distribution on a lunar regolith simulant (FJS-1) using a thermal microscope and to calculate the average thermal effusivity and thermal conductivity using density and specific heat. Moreover, discussions were conducted based on the results of the microstructural analysis of the sample. The FJS-1 particles were embedded in an epoxy resin and polished to a mirror finish. The samples were analyzed using scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM-EDS). X-ray diffraction (XRD) was performed to identify the mineral phases in FJS-1. The results of SEM-EDS and XRD showed that a single sand particle was composed of several minerals, such as anorthite and olivine. Then, the thermal microscope was used to obtain the distribution of the thermal effusivity of a particle from the mirror-finished sample in a 1 x 1 mm(2) area with intervals of 10 mu m. The measured thermal effusivity correlates with the SEM image of the sample. Anorthite has a small thermal effusivity of 1.99 +/- 0.31 kJ center dot s(-0.5)center dot m(-2)center dot K-1, while olivine has a large thermal effusivity of 2.73 +/- 0.35 kJ center dot s(-0.5)center dot m(-2)center dot K-1. In both cases, the thermal effusivity was found to be of the same order of magnitude as the reported values. The average thermal effusivity and conductivity of a single particle were determined to be 2.4 +/- 0.6 kJ center dot s(-0.5)center dot m(-2)center dot K-1 and 2.6 +/- 1.3 W m(-1)center dot K-1, respectively, based on the proportion of existing phases., Springer
International Journal of Thermophysics, May 2022, [Reviewed], [Invited]

Viscosity Measurements of Molten Metal Using an Improved Oscillating Crucible Method
Rika Sato; Tsuyoshi Nishi; Hiromichi Ohta; Hidemasa Yamano, Corresponding, Springer
International Journal of Thermophysics, Apr. 2022, [Reviewed], [Invited]

Thermal Conductivity of Sodium Silicate Glasses and Melts: Contribution of Diffusive and Propagative Vibration Modes
Sohei Sukenaga; Takahiko Endo; Tsuyoshi Nishi; Hiroki Yamada; koji Ohara; Toru Wakihara; Koji Inoue; Sakiko Kawanishi; Hiromichi Ohta; Hiroyuki Shibata, The thermal conductivity of silicate melts and glasses is an important physical property for understanding the temperature distribution in high-temperature metallurgical processes; however, the mechanism of heat conduction in these non-crystalline materials remains unclear. Two types of vibration modes must be considered to understand the mechanism of heat conduction, namely, propagative and diffusive vibration modes. In the present study, we carefully derived the thermal conductivity of pure silica and sodium disilicate glasses and melts, and estimated the contribution of the diffusive vibration mode using a recently developed model. The results indicated that the diffusive vibration mode was not dominant in the silicate non-crystalline materials, whereas the propagative vibration mode (i.e., phonons) was dominant in the heat conduction of silicate glasses and melts, which is in contrast with borate glasses., Frontiers Media SA
Frontiers in Materials, Nov. 2021, [Reviewed]

O. Norimasa, M. Hase, M. Hayamizu, S. Nagata, S. Tanaka, S. Miyake, T. Nishi, H. Murotani, M. Takashiri, Phonon transport properties depending on crystal orientation analyzed by nanoindentation using single-crystal silicon wafers
O. Norimasa; M. Hase; M. Hayamizu; S. Nagata; S. Tanaka; S. Miyake; T. Nishi; H. Murotani; M. Takashiri, The Japan Society of Applied Physics
Applied Physics Express, Nov. 2021, [Reviewed]

Evaluation of the Exothermic Behavior of Riser Sleeve Materials for Casting Based on Rapid Heating Test using an Electric Furnace　　　　　　　　　　　　　　　
ゴォニュホアン、西 剛史、根崎史歩、太田弘道, 日本実験力学会
日本実験力学会誌, Sep. 2021, [Reviewed]

Appropriate Laplace Variables for Thermal Diffusivity Analysis using Laplace Space Analysis in the Flash Method　　　　　　　　　　　　　　　
日本熱物性学会
熱物性, Aug. 2021, [Reviewed]

Viscosities of Molten B4C-Stainless Steel Alloys　　　　　　　　　　　　　　　
T. Nishi; R. Sato; H. Ohta; H. Kokubo; H. Yamano, Lead, Elsevier
Journal of Nuclear Materials, Aug. 2021, [Reviewed]

Thermal Effusivity Distribution Measurement of PbTe-Sb2Te3 Compounds by using Thermal Microscope　　　　　　　　　　　　　　　
伊藤俊亮、黒江怜史、西 剛史、太田弘道、池田輝之、羽鳥仁人, Corresponding
Netsu Bussei, May 2021, [Reviewed]

Examination of Thermal Diffusivity Measurement Method of Sample in Contact with Transparent Plate by Flash Method Considering Thermal Radiation　　　　　　　　　　　　　　　
K. Hosono; T. Nishi; H. Ohta
熱物性, Dec. 2020, [Reviewed]

Development of a novel thermal diffusivity analysis by a spot periodic heating and infrared radiation thermometer method
S. Nagata; T. Nishi; S. Miyake; N Azuma; K. Hatori; T. Awano; H. Ohta, A spot periodic heating method is a highly accurate, non-contact method for the evaluation of anisotropy and relative thermophysical property distribution. However, accurately evaluating thermal diffusivity is difficult due to the influence of temperature wave reflection from the whole surface of the sample. This study proposes a method to derive thermal diffusivity using a parameter table based on heat transfer equations using the concept of optimum distance between heating-point and measurement point. This method considers finite sample size, sensitivity distribution of infrared ray detector, intensity distribution of heating laser and sample thickness. In these results, the obtained thermal diffusivity of pure copper corresponded well with previous literature values. In conclusion, this method is considered highly effective in evaluating the thermal diffusivity in the horizontal direction., MDPI
Materials, Oct. 2020, [Reviewed]

Effect of radiative heat loss on thermal diffusivity evaluated using normalized logarithmic method in laser flash technique　　　　　　　　　　　　　　　
T. Nishi; N. Azuma; H. Ohta, Lead
High Temperature Materials and Processes, Sep. 2020, [Reviewed]

Thermodynamic and Thermophysical Properties of the Actinide Nitrides　　　　　　　　　　　　　　　
M. Uno; T. Nishi; M. Takano
Comprehensive Nuclear Materials 2nd edition, Jul. 2020, [Reviewed]

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors: (1) project overview
Yamano; H.; Takai; T.; Furukawa; T.; Kikuchi; S.; Emura; Y.; Kamiyama; K.; Fukuyama; H.; Higashi; H.; Nishi; T.; Ohta; H.; Liu; X.; Morita; K.; Nakamura; K.; Ohta; H.; Furuya; M., Eutectic reactions between boron carbide (B4C) and stainless steel (SS) as well as its relocation are one of the key issues in a core disruptive accident (CDA) evaluation in sodium-cooled fast reactors. Since such behaviors have never been simulated in CDA numerical analyses, it is necessary to develop a physical model and incorporate the model into the CDA analysis code. This study is focusing on B4C-SS eutectic melting experiments, thermophysical property measurement of the eutectic melt, and physical model development for the eutectic melting reaction. The eutectic experiments involve the visualization experiments, eutectic reaction rate experiments and material analyses. The thermophysical properties are measured in the range from solid to liquid state. The physical model is developed for a severe accident computer code based on the measured data of the eutectic reaction rate and the physical properties. This paper describes the project overview and progress of experimental and analytical studies by 2017. Specific results in this paper is boron concentration distributions of solidified B4C-SS eutectic sample in the eutectic melting experiments, which would be used for the validation of the eutectic physical model implemented into the computer code.
14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019; The Westin SeattleSeattle; United States; 22 September 2019 through 27 September 2019; Code 157481, Feb. 2020, [Reviewed]

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors: (4) effect of B4C addition on viscosity of austenitic stainless steel in liquid state　　　　　　　　　　　　　　　
Ohta; H.; Kokubo; H.; Nishi; T.; Yamano; H.
14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019; The Westin SeattleSeattle; United States; 22 September 2019 through 27 September 2019; Code 157481, Feb. 2020, [Reviewed]

Thermal conductivities of Na2O-B2O3-SiO2 melts　　　　　　　　　　　　　　　
T. Nishi; T. Manako; K. Ohnuma; H. Ohta; S. Sukenaga; H. Shibata; T. Oniki, Lead
Journal of Nuclear Science and Technology, Jul. 2019, [Reviewed]

CaO-SiO2-Al2O3-R2O(R=La, Na, K)系溶融ケイ酸塩の熱伝導率と粘性率の関係　　　　　　　　　　　　　　　
眞子巧巳; 西 剛史; 太田弘道; 助永壮平; 柴田浩幸, Corresponding
実験力学, Mar. 2019, [Reviewed]

Thermal conductivities of alkali–silicate and calcium–alkali–silicate melts　　　　　　　　　　　　　　　
Tsuyoshi Nishi; Katsuya Ohnuma; Kento Tanaka; Takumi Manako; Yoshifumi Yamato; Hiromichi Ohta; Sohei Sukenaga; Hiroyuki Shibata; Toshiaki Kakihara, Lead, ELSEVIER
Journal of Non-Crystalline Solids, 2019, [Reviewed]

Annealing Cycle Dependence of Thermal Conductivity for Si-Ge-Au Thin Film Analyzed by Thermal Microscopy　　　　　　　　　　　　　　　
T. Nishi; T. Mayama; H. Ohta; Y. Okamoto, Lead, MYU(Tokyo)
Sensors and Materials, 2019, [Reviewed]

Cooling Time Constant Accuracy Dependence of Thermal Diffusivity Accuracy in Flash Method Analysis　　　　　　　　　　　　　　　
K. Hosono; T. Nishi; H. Ohta
Netsu bussei, 2019, [Reviewed]

両端不透明体層とした半透明体のフラッシュ法による熱拡散率測定における熱放射の影響　　　　　　　　　　　　　　　
細野和也、西 剛史、太田弘道
熱物性, 2019, [Reviewed]

Examination of Apparent Study State Thermal Conductivity of 3-Layer Material with Semitransparent Material Sandwiched by Opaque Layer　　　　　　　　　　　　　　　
Kazuya Hosono; Tsuyoshi Nishi; Hiromichi Ohta, Japan Society of Thermophysical Properties
Netsu Bussei, 2019, [Reviewed]

Thermal diffusivity distribution measurements of a high-Thermal-conductive heat dissipating sheet
Takeru Hayashi; Tsuyoshi Nishi; Hiromichi Ohta; Kimihito Hatori; Hidenori Noguchi, High-Thermal-conductive heat dissipating sheet is an important material for promoting heat release. In this study, the correla-tion between the distribution of local thermal diffusivity and volume fraction was discussed. The local thermal diffusivity of the high-thermal-conductive heat dissipating sheet was measured using the laser flash method and the spot periodic heating and infrared radiation thermometer method. The volume fraction of the high-Thermal-conductive heat dissipating sheet was evaluated through microscopic observation. It was observed that the local thermal diffusivity of the approximately 0.5 mm-Thick high-Thermal-con-ductive heat dissipating sheet measured using the spot periodic heating and infrared radiation thermometer method was close to that measured using the laser flash method. The correlation between the distribution of the local thermal diffusivity and volume fraction was evident., Japan Institute of Metals (JIM)
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 2018

Evaluation of the evolved heat behavior for the exothermic sleeve by thermal and XRD Analyses
Kenshiro Kanbe; Tsuyoshi Nishi; Hiromichi Ohta; Ngo Nhu Hoang, In this study, evaluation of evolved heat behavior for exothermic sleeve by using the DSC, the XRD, and the TG-DTA measure-ments. In the results of the DSC measurements, the total evolved heat for the exothermic sleeve was 3.37×103-210 J/g. The deviation of the evolved heat was caused by the varisized Al particles. In the results of the XRD measurements, it was found that the exothermic heat of the exothermic sleeve was caused by the combustion of the resin, the oxidation of Al and Mg, formation of the melilite, and the oxidation of molten Al particles. In the results of the TG-DTA measurements, it was confirmed that the experiment-tal results of the DSC and the XRD measurements were good consistency with that of the TG-DTA measurement., Japan Institute of Metals (JIM)
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 2018

Thermal microscope measurement of thermal effusivity distribution in compositionally graded PbTe–Sb2Te3–Ag2Te alloy system
T. Nishi; S. Yamamoto; M. Okawa; K. Hatori; T. Ikeda; H. Ohta, Lead, A compositionally graded alloy in the PbTe–Sb2Te3–Ag2Te system was fabricated by the Bridgeman method. In the sample obtained for analysis, the length of the graded area was of the order of several tens of nanometers. Its thermal effusivity was measured with a thermal microscope, which required sputtering of a Mo film on the surface of the sample. The measured values of thermal effusivity depended on the thickness of the Mo film. However, it was difficult to sputter the Mo film uniformly in the wide area. Even though a relatively large target was used in the sputtering apparatus on the laboratory scale, the thickness of the Mo film just under the center of the target was larger than that in other areas. In this study, the measured thickness of the Mo film was calibrated with a high degree of accuracy against the reference glass slide. The thermal effusivity of the PbTe–Sb2Te3–Ag2Te alloy was in the range of 400–800 Ws0.5 m−2 K−1., Elsevier B.V.
Thermochimica Acta, 2018, [Reviewed]

Estimation of thermal conductivity of silicate melts using three-dimensional thermal resistor network model
T. Nishi; H. Ohta; S. Sukenaga; H. Shibata, Lead, Elsevier BV
Journal of Non-Crystalline Solids, 2018, [Reviewed]

Effect of Amount of Chunky Graphite on Mechanical Properties of Spheroidal-Graphite Cast Iron Running title: Effect of Chunky Graphite on Mechanical Properties of Ductile Iron
H. Nakayama; B.-R. Zhao; N. Furusato; S. Yamada; T. Nishi; H. Ohta, Chunky graphite is generated in heavy-section castings, and it is detrimental to the mechanical properties, especially the ductility and toughness, of cast iron. However, there have been few quantitative reviews that show the mechanical properties as functions of the amount of generated chunky graphite. In this study, a cylindrical casting containing chunky graphite was prepared. Pig iron and steel scraps with Fe–Si and rare-earth–Si compounds were used. We extracted some specimens from the casting and measured their mechanical properties through tensile-strength tests and Brinell hardness tests. The amount of chunky graphite in the specimens was determined by analyzing their electron microscope images to determine the ratio between the area of chunky graphite and the total area of all graphite. The specimen with a chunky-graphite content of 0% exhibited a tensile strength of 506 MPa and elongation of 25%. When the chunky-graphite content increased above 20%, the tensile strength of the specimens gradually decreased and finally reached 50 MPa, which is lower than that of the specimen containing no chunky graphite. The elongation decreased quickly among the specimens containing 20% to 40% of chunky graphite, and it eventually reached about 1/5 of that of the specimen containing no chunky graphite. On the other hand, the yield strength and hardness of the specimens were not affected by the chunky-graphite content., Japan Institute of Metals (JIM)
Matarial Transactions, 2018, [Reviewed]

Development of the Analysis Method of the Thermal Diffusivity of Multi-layered Sample by Laser Flash Method　　　　　　　　　　　　　　　
K. Hosono; T. Nishi; H. Ohta, 高温域を含む積層試料の熱拡散率測定を目的として、試料表裏面から放射損失がある条件で試料温度式をラプラス空間で導き、得られた解を用いて積層試料の熱拡散率をラプラス空間で最小二乗法にて決定する手法を検討した。
Netsu Bussei, 2018, [Reviewed]

Thermal Diffusivity Measurement by Ring Shape Heating and the Effect of Heat Spread on Flash Method　　　　　　　　　　　　　　　
Kazuya Hosono; Tsuyoshi Nishi; Hiromichi Ohta
Netsu Bussei, 2018, [Reviewed]

Thermal Diffusivity Measurement Method of Transparent Meterial sandwiched between opaque plates by Flsdh Method　　　　　　　　　　　　　　　
Kazuya Hosono; Tsuyoshi Nishi; Hiromichi Ohta
Netsu Bussei, 2018, [Reviewed]

熱分析・XRD測定による鋳造スリーブの発熱量挙動評価　　　　　　　　　　　　　　　
神戸健志郎; 西 剛史; 太田弘道; ゴ ニュ ホアン, Corresponding, 日本金属学会
日本金属学会誌, 2018, [Reviewed]

高熱伝導放熱シートの熱拡散率分布測定　　　　　　　　　　　　　　　
林 健; 西 剛史; 太田弘道; 羽鳥仁人; 野口秀則, Corresponding, 日本金属学会
日本金属学会誌, 2018, [Reviewed]

ステンレス鋼―B4C溶融混合物の系統的な粘度測定を目指したニッケルおよびステンレス鋼の粘度測定　　　　　　　　　　　　　　　
小久保宏紀; 西 剛史; 太田弘道; 山野秀将, Corresponding, 日本金属学会
日本金属学会誌, 2018, [Reviewed]

Determination of thermal conductivities of B2O3-SiO2 and CaO-B2O3-SiO2 melts　　　　　　　　　　　　　　　
T. Nishi; K. Tanaka; K. Ohnuma; T. Manako; H. Ohta; S. Sukenaga; H. Shibata; T. Kakihara, Lead, Elsevier
Journal of Nuclear Materials, 2018, [Reviewed]

AlO1.5-R2O-SiO2融体の熱浸透率測定　　　　　　　　　　　　　　　
眞子巧巳; 西 剛史; 太田弘道; 助永壮平; 柴田浩幸, Corresponding
日本金属学会誌, 2018, [Reviewed]

レーザフラッシュ法を用いたプラスチックの熱拡散率測定　　　　　　　　　　　　　　　
真山知大; 西 剛史; 太田弘道; 神田昌枝, Corresponding
日本金属学会誌, 2018, [Reviewed]

Evaluation of Accuracy of Interlayer Thermal Resistance and Thermal Diffusivity Measurements under Radiation Heat Loss by Flash Method.　　　　　　　　　　　　　　　
Kazuya Hosono; Tsuyoshi Nishi; Hiromichi Ohta
Netsu Bussei, 2018, [Reviewed]

An Approach to the Simple Calculation Method of Steady Thermal Conductivity of Semitransparent Material　　　　　　　　　　　　　　　
Kazuya Hosono; Tsuyoshi Nishi; Hiromichi Ohta
Netsu Bussei, 2018, [Reviewed]

Lattice parameter functions of (AmyU1-y)O2-x based on XRD and XANES measurements
Tsuyoshi Nishi; Masami Nakada; Masaru Hirata, The lattice parameters of (Am0.50U0.50)O-2.0, (Am0.37U0.63)O-2.0, and (Am0.37U0.63)O2-x were determined by powder X-ray diffraction with Cu K-alpha radiation. In addition, the lattice parameter functions of (AmyU1-y)O2-x (0.00 < x < 0.25, 0.00 < y < 0.50) were evaluated using models of (Am3+,yU1-2y4+Uy5+)o(2) and (Amy3+U1-y4+)O2-y/2 based on the results of X-ray diffraction and the ionic radii of Am3+, U4+, and U5+. In order to confirm the valence state of Am and U in (AmyU1-y)O2-x, the X-ray absorption near-edge structure measurements were performed in the transmission mode at the Am-L-III and U-L-III absorption edges of (Am0.50U0.50)O-2.0, (Am0.50U0.50)O2-x, and UO2.0., ACADEMIC PRESS INC ELSEVIER SCIENCE
JOURNAL OF SOLID STATE CHEMISTRY, Dec. 2017, [Reviewed]

Self-irradiation effect on thermal conductivity of Zr0.70Pu0.25Cm0.05N solid solution
Tsuyoshi Nishi; Hirokazu Hayashi; Takumi Sato; Masahide Takano, This study evaluated the dependence of the thermal conductivity of Zr0.70Pu0.25Cm0.05N on storage time and temperature. The authors prepared sintered samples of Zr0.70Pu0.25Cm0.05N solid 'solution and measured thermal diffusivity at storage times of 0, 24, 72,144, 240, 408, 552, 816,1,680, and 2064 h, from which it was determined that the thermal conductivity decreased exponentially With increasing storage time. This result suggests that the decrease of the thermal conductivity could be attributed to the accumulation of lattice defects from self -irradiation. To confirm the thermal recovery behavior of Zr0.70Pu0.25Cm0.05N under annealing, thermal diffusivity was also measured just after annealing. The thermal conductivity of Zr0.70Pu0.25Cm0.05N was determined to be larger than that of Zr0.58Pu0.21Cm0.21N but smaller than that of Zr0.80Pu0.10Cm0.10N. (C) 2017 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF NUCLEAR MATERIALS, Apr. 2017, [Reviewed]

Current Status and Future Plan of the Viscosity Measurement for the Lead-Free Solder
Yasutaka Hashimoto; Tsuyoshi Nishi; Hiromichi Ohta, The viscosities of the lead. free solders are important to simulate the process of the manufacturing process. In this article, current status of the viscosity measurements for the lead. free solders are reviewed. In addition, we introduced the current work of the viscosity measurements for the lead. free solders by using the rotational viscometer with concentric cylinder spindle geometry., JAPAN INST METALS
JOURNAL OF THE JAPAN INSTITUTE OF METALS, 2017, [Reviewed]

THERMAL CONDUCTIVITY OF BOROSILICATE MELT　　　　　　　　　　　　　　　
Tsuyoshi NISHI; Junpei OJIMA; Yoshitaka KURODA; Hiromichi OHTA; Sohei SUKENAGA; Hiroyuki SHIBATA; Hidenori KAWASHIMA, Lead, John Wiley & Sons, Inc.
Proceedings of The 10th International Conference on Molten Slags, Fluxes and Salts (MOLTEN16) Edited by: Ramana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, and Uday Pal, 2016, [Reviewed]

Thermal conductivity of U-20 wt.%Pu-2 wt.%Am-10 wt.%Zr alloy
Tsuyoshi Nishi; Kunihisa Nakajima; Masahide Takano; Masaki Kurata; Yuji Arita, The authors fabricated U-20 wt.%Pu-2 wt.%Am-10 wt.%Zr alloys and evaluated the heat capacity and thermal conductivity. The heat capacity was measured between 335 and 827 K by a drop calorimetry. The thermal diffusivity was measured between 300 and 1073 K by a laser flash method. The thermal conductivity was evaluated from the measured thermal diffusivity and heat capacity. The thermal conductivity of U-20 wt.%Pu-2 wt.%Am-10 wt.%Zr alloy was slightly higher than literature values of U-Pu-Zr and U-Pu-MA-Zr alloys. The thermal conductivity was formulated for use in practical design for Generation IV fast reactors. (C) 2015 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF NUCLEAR MATERIALS, Sep. 2015, [Reviewed]

Recent Progress and Future R&D Plan of Nitride Fuel Cycle Technology for Transmutation of Minor Actinides　　　　　　　　　　　　　　　
H. Hayashi; T. Nishi; M. Takano; T. Sato; H. Shibata; M. Kurata
Proceedings of 13th OECD /NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation, Seoul, Korea, 2015

Development of nitride fuel cycle technology for transmutation of minor actinides　　　　　　　　　　　　　　　
H. Hayashi; T. Nishi; T. Sato; M. Kurata
Proceedings of International Nuclear Fuel Cycle Conference (GLOBAL 2015), Paris, France, 2015

An innovative anode concept for improving anodic dissolution rate of nitride fuel in electrorefining process　　　　　　　　　　　　　　　
T. Sato; H. Hayashi; T. Nishi; M. Kurata
Proceedings of International Nuclear Fuel Cycle Conference (GLOBAL 2015), Paris, France, 2015

Fundamental experiments on phase stabilities of Fe–B–C ternary systems
A. Sudo; T. Nishi; N. Shirasu; M. Takano; M. Kurata, To understanding the control blade degradation mechanism of a boiling-water reactor (BWR), a thermodynamic database for the fuel assembly materials is a useful tool. Although the iron, boron, and carbon ternary system is a dominant phase diagram, phase relation data are not sufficient for the region in which boron and carbon compositions are richer than the eutectic composition. The phase relations of three samples such as Fe0.68B0.06C0.26 (at%), Fe0.68B0.16C0.16 (at%), and Fe0.76B0.06C0.18 (at%) were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectrometry. The results indicate that the Fe-3(B,C) phase exists only in the intermediate region at 1273 K and that the solidus temperature widely maintains at approximately 1400 K for all three samples; these results differ from the calculated data using the previous thermodynamic database. The difference might originate from the overestimation of the interaction parameter between boron and carbon in Fe-3(B,C). Proper titling was performed using the present data., TAYLOR & FRANCIS LTD
Journal of Nuclear Science and Technology, 2015

Self-radiation effects and grassy nature of magnetic transition in AmO2 revealed by 17O-NMR
Y. Tokunaga; T. Nishi; M. Nakada; A. Itoh; H. Sakai; S. Kambe; Y. Honma; F. Honda; D. Aoki; R. E. Walstedt, The magnetic phase transition near T-0 = 8.5 K in americium dioxide (AmO2) has been investigated microscopically by means of O-17 NMR. To avoid complexities arising from sample aging associated with the a decay of Am-243, all measurements have been performed within 40 days after sample synthesis. Even during such a short period, however, a rapid change of NMR line shape has been observed at 1.5 K, suggesting that the ground state of AmO2 is very sensitive to disorder. We have also confirmed the loss of O-17 NMR signal intensity over a wide temperature range below T-0, and more than half of oxygen nuclei are undetectable at 1.5 K. This behavior reveals the persistence of slow and distributed spin fluctuations down to temperatures well below T-0. In the paramagnetic state, strong NMR line broadening and spatially inhomogeneous spin fluctuations have been observed. The results are all indicative of short-range, spin-glass-like character for the magnetic transition in this system., AMER PHYSICAL SOC
Physical Review B, 2014, [Reviewed]

Characterization of solidified melt among materials of UO2 fuel and B4C control blade
M. Takano; T. Nishi; N. Shirasu, To predict the fundamental phase relationships in the solidified core melt of the Fukushima Daiichi Nuclear Power Plant, solidified melt samples of the various core materials [B4C, stainless steel, Zr, ZrO2, (U,Zr)O-2] were prepared by arc melting. Phases and compositions in the samples were determined by means of X-ray diffraction, microscopy, and elemental analysis. With various compositions, the only oxide phase formed was (U, Zr)O-2. After annealing, the stable metallic phases were an Fe-Cr-Ni alloy and an Fe2Zr-type (Fe, Cr, Ni)(2)(Zr, U) intermetallic compound. The borides, ZrB2 and Fe2B-type (Fe, Cr, Ni)(2)B, were solidified in the metallic part. Annealing at 1773 K under an oxidizing atmosphere (Ar-0.1% O-2) resulted in the oxidation ofUand Zr in the alloy and in ZrB2, and consequently the (Fe, Cr, Ni)(2)B and Fe-Cr-Ni alloy became dominant in the metallic part. The experimental phase relationships in the metallic part agreed reasonably with the thermodynamic evaluation of equilibrium phases in a simplified B4C-Fe-Zr system. The metallic Zr content in the melt was found to be a key factor in determining the phase relationships. As a basic mechanical property, the microhardness of each phase was measured. The borides, especially ZrB2, showed notably higher hardness than any other oxide or metallic phases., TAYLOR & FRANCIS LTD
Journal of Nuclear Science and Technology, 2014, [Reviewed]

Sintering and characterization of (Pu,Zr)N
M. Pukari; M. Takano; T. Nishi, Nitride fuel, with the composition of (Pu0.4Zr0.6)N, is fabricated for studying the sinterability of nitride fuel as a function of oxygen concentration in the material. Oxygen concentration of up to 0.6 wt% evidently enhances the densification of the material. Increasing the sintering temperature from 1923 to 1973 K improves the sintered pellet densities by up to 3.8%TD. In addition, the measured thermophysical and electrical properties of (Pu0.4Zr0.6)N reveal that the values are close to those of PuN. Elevated oxygen concentration in the material decreases its thermal conductivity. Oxygen concentration of 0.34 wt% in (Pu,Zr)N is a consequence of the fabrication process, considering the relatively pure ZrN (0.03 wt% O) and PuN (0.08 wt% O) powders initially fabricated. (C) 2013 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Science and Technology, 2014, [Reviewed]

High temperature reaction between sea salt deposit and (U,Zr)O-2 simulated corium debris
Masahide Takano; Tsuyoshi Nishi, In order to clarify the possible impacts of seawater injection on the chemical and physical state of the corium debris formed in the severe accident at Fukushima Daiichi Nuclear Power Plants, the high temperature reaction between sea salt deposit and (U,Zr)O-2 simulated corium debris (sim-debris) was examined in the temperature range from 1088 to 1668 K. A dense layer of calcium and sodium uranate formed on the surface of a sim-debris pellet at 1275 K under airflow, with the thickness of over 50 mu m. When the oxygen partial pressure is low, calcium is likely to dissolve into the cubic sim-debris phase to form solid solution (Ca,U,Zr)O2+x. The diffusion depth was 5-6 mu m from the surface, subjected to 1275 K for 12 h. The crystalline MgO remains affixed on the surface as the main residue of salt components. A part of it can also dissolve into the sim-debris. (C) 2013 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF NUCLEAR MATERIALS, Nov. 2013, [Reviewed]

DFT study on the electronic structure and chemical state of Americium in an (Am,U) mixed oxide
C. Suzuki; T. Nishi; M. Nakada; T. Tsuru; M. Akabori; M. Hirata; Y. Kaji, We investigated the electronic state of an (Am,U) mixed oxide with the fluorite structure using the all-electron full potential linear augmented plane wave method and compared it with those of Am2O3, AmO2, UO2, and La0.5U0.5O2. The valence of Am in the mixed oxide was close to that of Am2O3 and the valence of U in the mixed oxide was pentavalent. The electronic structure of AmO2 was different from that of Am2O3, particularly just above the Fermi level. In addition, the electronic states of Am and U in the mixed oxide were similar to those of trivalent Am and pentavalent U oxides. These electronic states reflected the high oxygen potential of AmO2 and the heightened oxygen potential resulting from the addition of Am to UO2 and also suggested the occurrence of charge transfer from Am to U in the solid solution process. (C) 2013 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Journal of Physics and Chemistry of Solids, 2013, [Reviewed]

Thermal conductivity of (Np0.20Pu0.50Am0.25Cm0.05)O2-x solid solutions
T. Nishi; M. Takano; M. Akabori; Y. Arai, Lead, The authors prepared the sintered sample of (Np0.20Pu0.50Am0.25Cm0.05)O2-x (2 - x = 1.98, 1.96) solid solution and evaluated the dependence of the thermal conductivity on storage time and temperature. The heat capacity of (Np0.20Pu0.50Am0.25Cm0.05)O-1.98 was measured between 324 and 1082 K by a drop calorimetry. The thermal diffusivity of (Np0.20Pu0.50Am0.25Cm0.05)O-1.98 was measured when the storage time became 48, 216, 720 and 1584 h and that of (Np0.20Pu0.50Am0.25Cm0.05)O-1.96 was measured when the storage time became 0,528 and 1386 h. In this study, the latter Sample was annealed at 1423 K in vacuum with background pressure of less than 2.0 x 10(-4) Pa just after the measurement on the storage time, 1386 h. The thermal diffusivity of (Np0.20Pu0.50Am0.25Cm0.05)O-1.96 just after annealing returned to the values of the storage time, 0 h. This result reveals the thermal recovery behavior by annealing. The thermal conductivity of (Np0.20Pu0.50Am0.25Cm0.05)O2-x was determined from the measured thermal diffusivity, heat capacity and bulk density. The thermal conductivity of (Np0.20Pu0.50Am0.25Cm0.05)O2-x exponentially decreased with increasing storage time. This result suggested that the decrease of the thermal conductivity was attributed to the accumulation of lattice defects caused by self-irradiation. (C) 2013 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2013, [Reviewed]

Self-irradiation effect on thermal conductivity of (Pu 0.91Cm0.09)O2
Tsuyoshi Nishi; Masahide Takano; Mitsuo Akabori; Yasuo Arai, To clarify the dependence of thermal conductivity on storage time of MA containing oxide fuel, the thermal diffusivity of (Pu0.91Cm 0.09)O2 was measured at 473, 523 and 573 K by a laser flash method using the sample stored for 48, 264, 504, and 960 h. The heat capacity was measured by a drop calorimetry to derive the thermal conductivity. It was confirmed that the degradation of the thermal conductivity was attributed to the accumulation of lattice defects caused by self-irradiation, because the dependence of thermal conductivity on storage time could be approximated by the equation used for self-irradiation lattice expansion model. © 2012 Elsevier B.V. All rights reserved., Elsevier B.V.
Journal of Nuclear Materials, 2013, [Reviewed]

Thermodynamic and thermophysical properties of the actinide nitrides
Uno, Masayoshi; Nishi, Tsuyoshi; Takano, Masahide
Comprehensive Nuclear Materials, 2, Mar. 2012, [Reviewed]

Thermal conductivity of dilute Am containing alloy
Nishi Tsuyoshi; Nakajima Kunihisa; Takano Masahide; Arita Yuji, MA含有合金燃料の挙動評価や設計のためには、MAの添加により影響を受ける燃料特性の把握が必要不可欠である。本研究では、その一環として、1.6wt%のAmを含有した合金の調製を行うとともに、比熱及び熱拡散率を測定し、熱伝導率の評価を行った。, Atomic Energy Society of Japan
Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan, 2012

Development status of low activation ternary Au-In-Cd alloy decoupler for a MW class separation neutron source -1st production of Au-In-Cd alloy
M. Ooi; M. Teshigawara; T. Wakui; T. Nishi; M. Harada; F. Maekawa; M. Futagawa, The Japan Spallation Neutron Source (JSNS) at the Japan Proton Accelerator Research Complex (J-PARC) has been developed as a 1-MW spallation neutron source. Ag-In-Cd (AIC) alloy was used as the decoupler material in two decoupled moderators, which allowed high decoupling energies of 1 eV to be achieved for the first time in a MW-class spallation neutron source. Although the AIC decoupler is superior in neutronic performance, it has the disadvantage of high residual radioactivity resulting from the production of Ag-110 m (T-1/2 (half-life) = 250 d) and Ag-108 m (T-1/2 = 418 yr). A Au-In-Cd alloy has been proposed as a solution to this problem, as the neutronic performance of this alloy is sufficiently high for it to act as a decoupler. By diffusion of Cd into Au at a maximum temperature of 1123 K, we successfully produced this ternary Au-In-Cd alloy. Then, we confirmed the compositional uniformity of the alloy by energy-dispersive X-ray (EDX) analysis. The thermal conductivity, Young's modulus, and stress at 0.2% strain of the Au-In-Cd alloy were 87.7 Wim/K, 80 GPa, and 160 MPa, respectively. These results demonstrated the possibility of using this alloy as a decoupler. Further study of the Au-In-Cd alloy is in progress. (C) 2011 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2012, [Reviewed]

Thermodynamic properties of neptunium nitride: a first principles study
H. Shibata; T. Tsuru; T. Nishi; M. Hirata; Y. Kaji, The thermal and mechanical properties of neptunium nitride (NpN) were investigated by first principles calculations. From the Helmholtz free energy equilibrium lattice constants, thermal expansion coefficients, bulk moduli and specific heat capacities were calculated for temperatures up to 1500 K. The electronic specific heat capacity was also calculated from the electronic density of states at the Fermi energy. The obtained specific heat capacity reproduced the experimental data well. It was thus clarified that the specific heat capacity of NpN consists of the lattice and electronic specific heat capacities and the contribution of the lattice dilatation to the specific heat capacity., TAYLOR & FRANCIS LTD
Journal of Nuclear Science and Technology, 2012, [Reviewed]

Core-hole effect on XANES and electronic structure of minor actinide dioxide with fluorite structure
C. Suzuki; T. Nishi; M. Nakada; M. Akabori; M. Hirata; Y. Kaji, The authors investigated theoretically core-hole effects on X-ray absorption near-edge structures (XANES) of Np and Am L-III in neptunium dioxide (NpO2) and americium dioxide (AmO2) with CaF2-type crystal lattices using the all-electron full-potential linearized augmented plane-wave (FP-LAPW) method. The peak creation mechanism of XANES was shown by examining the electronic structures of these oxides, which indicated that core-hole screening was more marked for AmO2 than for NpO2 because of the difference in the charge transfer between these oxides. Furthermore, the results of charge density analysis suggested that the white line was assigned to the quasi-bound state composed of the localized Np d or Am d components and O components, and that the tail structure was created as a result of delocalized standing waves between the Np or Am atoms. (C) 2011 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Journal of Physics and Chemistry of Solids, 2012, [Reviewed]

High temperature reaction between UO2 and sea salt deposi　　　　　　　　　　　　　　　
M. Takano; T. Nishi; M. Kurata; M. Amaya; F. Nagase, 海水塩が燃料デブリに与える化学的影響を評価するための基礎試験として、海水塩とUO2との反応試験を行い、XRDによる相同定やSEM-EDXによる元素分析を実施した。
Proceedings of 5th European Review Meeting on Severe Accident Research (ERMSAR 2012), 2012

Valence state of Am in (U0.95Am0.05)O2
T. Nishi; M. Nakada; C. Suzuki; H. Shibata; A. Itoh; M. Akabori; M. Hirata, Lead, (U0.95Am0.05)O2のAm-L3吸収端のXAFS測定を行い、(U0.95Am0.05)O2のAmの価数は3価であることを明らかにした。, ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2011, [Reviewed]

Heat capacities and thermal conductivities of AmO1.5 and AmO2
T. Nishi; A. Itoh; K. Ichise; Y. Arai, Lead, The thermal diffusivity of AmO2 was measured from 473 to 773 K and that of AmO1.5 between 473 and 1373 K using a laser flash method. The enthalpy increment of AmO2 was measured from 335 to 1081 K and that of AmO1.5 between 335 and 1086 K using drop calorimetry. The heat capacities of AmO2 and AmO1.5 were derived from the enthalpy increment measurements. The thermal conductivity was determined from the measured thermal diffusivity, heat capacity and bulk density. The heat capacities of AmO2 was found larger than that of AmO1.5. The thermal conductivities of AmO2 and AmO1.5 were found to decrease with increasing temperature in the investigated temperature range. The thermal conductivity of AmO1.5 with A-type hexagonal structure was smaller than that of AmO2 with C-type fluorite structure but larger than that of sub-stoichiometric AmO1.73. © 2010 Elsevier B.V. All rights reserved.
Journal of Nuclear Materials, 2011, [Reviewed]

Thermal conductivities of Zr-based transuranium nitride solid solutions
T. Nishi; M. Takano; K. Ichise; M. Akabori; Y. Arai, Lead, In this study, the authors prepared sintered samples of (Zr0.58Pu0.21Am0.21)N, (Zr0.80Pu0.10Am0.10)N, and (zr(0.70)Np(0.06)Pu(0.15)Am(0.075)Cm(0.015))N solid solutions. The thermal diffusivities and heat capacities of these Zr-based transuranium nitride solid solutions were measured using a laser flash method and drop calorimetry, respectively. Thermal conductivities from 473 to 1,473 K were determined from the measured thermal diffusivity, heat capacity, and bulk density. The thermal conductivities of Zr-based transuranium nitride solid solutions were found to be higher than that of (Pu0.5Am0.5)N due to the high thermal conductivity of ZrN as the principal component, although they were lower than that of ZrN due to the impurifying effect of the transuranium elements. At 873 K, the thermal conductivities of ZrN, (Zr0.58Pu0.21Am0.21)N, (Zr0.80Pu0.10Am0.10)N, (Zr0.70Np0.06Pu0.15Am0.075Cm0.015)N, and (Pu0.5Am0.5)N were 63.9, 15.8, 25.5, 20.6, and 8.9 Wm(-1)K(-1), respectively. In these results, the thermal conductivities of the Zr-based transuranium nitride solid solutions increased with increasing ZrN concentration., TAYLOR & FRANCIS LTD
Journal of Nuclear Science and Technology, 2011, [Reviewed]

Thermal Conductivities of (ZrxPu(1-x)/2Am(1-x)/2)N Solid Solutions　　　　　　　　　　　　　　　
T. Nishi; M. Takano; M. Akabori; Y. Arai, Lead, ADS用燃料の有力候補である(ZrxPu(1-x)/2Am(1-x)/2)N の試料調製及び熱伝導率測定について紹介し、誤差評価した組成と温度をパラメータとした熱伝導率評価式について紹介した。
Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011), 2011

NMR study in AmO2: Comparison with UO2 and NpO2
Y. Tokunaga; T. Nishi; S. Kanbe; M. Nakada; Y. Honma; H. Sakai; H. Chudo, Recently, O-17 NMR has been performed for the first time on AmO2. We have observed a drastic broadening of the NMR spectrum, along with a sudden drop of NMR signal intensity, below T-0 = 8.5 K. These data provide the first microscopic evidence for a phase transition at this temperature as a bulk property of this system. In this paper, we compare NMR results for AmO2 with those from UO2 and NpO2. In the ordered state we have recorded an O-17 NMR spectrum with a triangular line shape, which resembles neither that of UO2 nor NpO2. This spectrum indicates that the internal local field H-int is distributed very nearly randomly from zero to a maximum value, that is, H-int(max) similar to 7kOe. The temperature dependences of the Knight shift and the nuclear relaxation rate are also compared., PHYSICAL SOC JAPAN
Supplement of Journal of the Physical Society of Japan, 2011, [Reviewed]

NMR evidence for the 8.5 K phase transition in Americium dioxide
Y. Tokunaga; T. Nishi; S. Kambe; M. Nakada; A. Itoh; Y. Homma; H. Sakai; H. Chudo, We report here the first NMR study of americium dioxide (AmO2). More than 30 years ago, a phase transition was suggested to occur in this compound at 8.5K based on magnetic susceptibility data, while no evidence had been obtained from microscopic measurements. We have prepared a powder sample of (AmO2)-Am-243 containing 90 at. % O-17 and have performed O-17 NMR at temperatures ranging from 1.5 to 200 K. After a sudden drop of the O-17 NMR signal intensity below 8.5 K, at 1.5 K we have observed an extremely broad spectrum covering a range of similar to 14 kOe in applied field. These data provide the first microscopic evidence for a phase transition as a bulk property in this system. In addition, the O-17 NMR spectrum has been found to split into two peaks in the paramagnetic state, an effect which has not been reported for actinide dioxides studied up to now. We suggest that the splitting is induced by self-radiation damage from the alpha decay of Am-243., PHYSICAL SOC JAPAN
Journal of the Physical Society of Japan, 2010, [Reviewed]

Local and electrical structure of Am2O3 and AmO2 with XAFS spectroscopy
T. Nishi; M. Nakada; C. Suzuki; H. Shibata; A. Itoh; M. Akabori; M. Hirata, Lead, XAFS studies were performed in a study of americium sesquioxide (Am2O3) with A-type rare earth oxide structure and americium dioxide (AmO2) with fluorite structure. EXAFS results on the Am-L-III absorption edge of Am2O3 and AmO2 were in good agreement with crystallographic data resulting from X-ray diffraction analysis. Theoretical assignments were performed using the all-electron Full Potential Linearized Augmented Plane Wave (FP-LAPW) method in characterizing XANES with regard to the electronic structure of Am2O3 and AmO2. The theoretical XANES spectra of Am2O3 and AmO2 well reproduced the experimental ones. In addition, it was found that the white line peak was created due to the interaction between the Am-d and O-p components, and the broad peak and the tail peak were created due to the interaction between the Am-d and O-d components. (C) 2010 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2010, [Reviewed]

Thermal conductivities of (Np,Am)N and (Pu,Am)N solid solutions
T. Nishi; M. Takano; A. Itoh; S. Miyata; M. Akabori; Y. Arai; K. Minato, Lead, The thermal diffusivities and heat capacities of transuranium nitride solid solutions, (Np,Am)N and (Pu,Am)N, were measured by using a laser flash method and a drop calorimetry, respectively. The thermal conductivities of these samples were determined from the measured thermal diffusivities, heat capacities and bulk densities. The thermal conductivities of (Np,Am)N and (Pu,Am)N increased with temperature over the temperature range investigated. The increases in the thermal conductivities were probably due to the increases of electrical components. In addition, the thermal conductivities of (Np,Am)N and (Pu,Am)N decreased with increasing Am contents. It could be considered that the decreases in the thermal conductivities with increasing Am contents correspond to the lowering of electronic contribution., IOP PUBLISHING LTD
IOP Conf. Series: Materials Science and Engineering, 2010, [Reviewed]

Thermochemical and thermophysical properties of minor actinide compounds
K. Minato; M. Takano; H. Otobe; T. Nishi; M. Akabori; Y. Arai, Burning or transmutation of minor actinides (MA: Np, Am, Cm) that are classified as the high-level radioactive waste in the current nuclear fuel cycle is an option for the advanced nuclear fuel cycle. Although the thermochemical and thermophysical properties of minor actinide compounds are essential for the design of MA-bearing fuels and analysis of their behavior, the experimental data on minor actinide compounds are limited. To support the research and development of the MA-bearing fuels, the property measurements were carried out on minor actinide nitrides and oxides. The lattice parameters and their thermal expansions were measured by high-temperature X-ray diffractometry. The specific heat capacities were measured by drop calorimetry and the thermal diffusivities by laser-flash method. The thermal conductivities were determined by the specific heat capacities, thermal diffusivities and densities. The oxygen potentials were measured by electromotive force method. (c) 2009 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2009, [Reviewed]

Calculation of the electronic structure of AmO2 and Pr6O11 for XANES analysis with redox property
Chikashi Suzuki; Tsuyoshi Nishi; Masami Nakada; Mitsuo Akabori; Masaru Hirata; Yoshiyuki Kaji, We calculated X-ray absorption near-edge structure (XANES) of Am L-III of AmO2 and Pr L-III of Pr6O11 using the relativistic discrete-variational (DV)-X alpha method based on the Dirac-Slater method, and compared it with the experimental spectra. These spectra were calculated on a model of AmO2 ([AmO8](12-)) and Pr6O11 ([PrO8](12-)). In spite of using small cluster models, the calculated spectra were in good agreement with the experiment ones. Besides, we calculated the electronic structure of AmO2 and Pr6O11 to analyze the peak structures of XANES. From this calculation, it was found that O s, p, and f components had influence on the specific peak structures but that O d component had influence on various peak structures for AmO2 and Pr6O11. From this result, it was suggested that the change of the electronic structure of actinide 6d and O d or f was important for actinide L-III XANES corresponding to oxygen to metal ratio in the oxide nuclear fuel. On the basis of these results, we calculated the fine structures of densities of states and the transition energy from the HOMO to the white line of AmO2, UO2, and Pr6O11 and investigated redox properties of Am and U in the oxide nuclear fuel with the evaluation of validity of Pr as simulant materials of Am. (C) 2009 Wiley Periodicals, Inc. Int J Quantum Chem 109: 2744-2752, 2009, WILEY-BLACKWELL
International Journal of Quantum Chemistry, 2009, [Reviewed]

Heat capacities of NpN and AmN
T. Nishi; A. Itoh; M. Takano; M. Numata; M. Akabori; Y. Arai; K. Minato, Lead, The heat capacities of NpN and AmN were determined with the drop calorimetry method. The NpN and AmN samples were prepared by the carbothermic reduction of the respective dioxides. The heat capacity of NpN obtained was in good agreement with the reported values in the temperature range from 334 to 1067 K, which was close to those of UN and PuN. The heat capacity of AmN was obtained experimentally for the first time, which was slightly smaller than those of UN, NpN and PuN in the temperature range from 354 to 1071 K. (c) 2008 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2008, [Reviewed]

Thermal conductivity of neptunium dioxide
Tsuyoshi Nishi; Akinori Itoh; Masahide Takano; Masami Numata; Mitsuo Akabori; Yasuo Arai; Kazuo Minato, Lead, The thermal diffusivity of neptunium dioxide was measured in the temperature range from 473 to 1473 K by using a laser flash method. The thermal diffusivity slightly decreased with increasing temperature in the temperature range investigated. The heat capacity of NpO2 was measured in the temperature range from 334 to 1071 K by using a drop calorimetry method. The heat capacity of NpO2 determined in this study was slightly larger than that of UO2 and about 7% smaller than that of PuO2. The thermal conductivity of NpO2 was determined from the thermal diffusivity, the heat capacity and the bulk density. It was found that the thermal conductivity of NpO2 from 873 to 1473 K lay between those of UO2 and PuO2. (C) 2008 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2008, [Reviewed]

EXAFS and XANES studies of americium dioxide with fluorite structure
T. Nishi; M. Nakada; A. Itoh; C. Suzuki; M. Hirata; M. Akabori, Lead, EXAFS and XANES analyses were applied in a study of americium dioxide (AMO(2)) with fluorite structure. EXAFS result for AmLIII absorption edge of AmO2 was in good agreement with the long-ranged structural data from X-ray diffraction analysis. In order to characterize XANES in aspect of the electronic structure, the theoretical assignment for the AmO2 was performed with the relativistic DV-X alpha molecular orbital method. The calculated XANES spectrum well reproduced the experimental spectrum. From this theoretical assignment, it was found that the peaks of the XANES spectrum were created due to the specific hybridization of orbital components. (C) 2007 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2008, [Reviewed]

Thermal conductivity of AmO2-x
T. Nishi; M. Takano; A. Itoh; M. Akabori; Y. Arai; K. Minato; M. Numata, Lead, The thermal diffusivity of americium oxide was determined in the temperature range from 299 to 1473 K by a laser flash method. The thermal diffusivity of AmO2-x decreased with increasing temperature. The thermal conductivity of AmO2-x was estimated from the measured thermal diffusivity, the specific heat capacity and the bulk density. It was found that the thermal conductivity of AmO2-x decreased with increasing temperature in the temperature range investigated. It was also found that the decrease in O/Am ratio during the thermal diffusivity measurements under vacuum resulted in a slight decrease in thermal conductivity of AmO2-x. (C) 2007 Published by Elsevier B.V., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2008, [Reviewed]

Thermal conductivities of neptunium and americium mononitrides　　　　　　　　　　　　　　　
T. Nishi; A. Itoh; M. Takano; M. Akabori; Y. Arai; K. Minato, Lead, 実測した比熱を用いてAmNの熱伝導率の再評価を行い、AmNとNpNの熱伝導率について比較、検討を行った。
Proceedings of 10th OECD /NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation, 2008

Thermal conductivities of minor actinide oxides for advanced fuel　　　　　　　　　　　　　　　
T. Nishi; A. Itoh; M. Takano; M. Akabori; Y. Arai; K. Minato, Lead, 新型燃料の熱特性・挙動を把握する上で重要なAmO2-x及びNpO2の熱拡散率及び比熱の測定方法を紹介し、酸化物燃料の熱伝導率との比較、検討を行った。
Proceedings of 3rd International ATALANTE Conference (ATALANTE 2008), 2008

Thermal diffusivity of Americium mononitride from 373 to 1473 K
T. Nishi; M. Takano; A. Itoh; M. Akabori; K. Minato; M. Kizaki, Lead, The thermal diffusivity of AmN was measured from 373 to 1473 K by a laser flash method. The AmN sample was prepared from AmO2 by the carbothermic reduction. The obtained AmN product was grinded and pressed at about 400 MPa to form a disk. The disk was sintered at 1823 K for 10 h in flowing N-2 + 4%H-2 gas. The thermal diffusivity slightly decreased from 3.4 x 10(-6) to 2.8 x 10(-6) m(2)/S with increasing temperature. As the specific heat capacity of AmN was not available in literature, the thermal conductivity of AmN was tentatively estimated from the measured thermal diffusivity, bulk density and the specific heat capacity of PuN. It was found that the thermal conductivity of AmN slightly increased with temperature. The thermal conductivity of AmN corrected to 100%TD was found to be smaller than those of UN, NpN and PuN, whereas that of AmN was larger than those Of UO2 and (U0.8Pu0.2)O-2. (c) 2006 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Journal of Nuclear Materials, 2006, [Reviewed]

Themochemical and thermophysical properties of advanced fission fuel materials
K. Minato; M. Takano; T. Nishi; M. Akabori; Y. Arai; M. Uno, MA含有窒化物燃料の熱化学的及び物理的特性について最新の研究成果を紹介し、熱物性の部分を担当した。
Advances in Science and Technology, 2006, [Reviewed]

Properties of minor actinide compounds relevant to nuclear fuel technology　　　　　　　　　　　　　　　
K. Minato; M. Takano; T. Nishi; A. Itoh; M. Akabori, マイナーアクチノイド（MA）窒化物及び酸化物の試料調製及び熱物性測定についての研究について記述し、試料調製及び熱拡散率測定の部分を担当した。
Recent Advances in Actinide Science, 2006, [Reviewed]

Specific Heat Measurements of Pd-based Alloy in the Liquid State by the Heat-Flux type DSC with Triple Cells
T. Nishi; H. Shibata; H. Ohta; N. Nishiyama; A. Inoue; Y. Waseda, Lead, The specific heat values of liquid Pd40Cu30Ni10P20, Pd40Ni40P20 and Pd40Cu40P20 alloys which are known to show excellent glass forming ability have been measured in the temperature range between 973 and 1123 K by the heat-flux type DSC with triple cells. The uncertainty of the specific heat values obtained with the DSC was estimated to be +/-7% at most by measuring the specific heat of pure silver. The specific heat values for liquid Pd40Cu30Ni10P20, Pd40Ni40P20 and Pd40Cu40P20 alloys are given as follows. (unit: C-p:Jg(-1) K-1, T:K)
C-pPd 40 Cu 30 Ni 10 P 20=-2.45x10(-4) T+0.739 973less than or equal toTless than or equal to1123
C-pPd 40 Ni 40 P 20=-2.53x10(-4) T+0.727 1023less than or equal toTless than or equal to1123
C-pPd 40 Cu 40 P 20=-4.18x10(-4) T+0.828 973less than or equal toTless than or equal to1123., JAPAN INST METALS
JOURNAL OF THE JAPAN INSTITUTE OF METALS, 2004, [Reviewed]

Czochralski Growth of Yb doped Oxyapatite for High Power Laser Application
A.Yoshikawa; C.Fujiwara; H.Sato; T.Nishi; H.Ohta; T.Fukuda; Y.Waseda G. Boulon; M.Ito; Y.Guyot; K.Lebbou, Ca-8(La,Yb)(2)(PO4)(6)O-2 (Yb:CLPA) single crystals with the apatite-type structure could be grown from the melt using the Czochralski method. Grown crystal was 18 mm in diameter and 110 mm in length. It is transparent with slightly blue color. Neither visible inclusion nor crack was observed. Thermal conductivity of Yb:CLPA was calculated from the values of thermal diffusivity, heat capacity measurement and density. Luminescent characterization was carried out from the results of emission, absorption and Raman spectrum. (C) 2004 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
Optical Materials, 2004

Electrical Resistivity Measurements of Pd40Cu30Ni10P20 Alloy in Supercooled Liquid and Liquid State
T. Nishi; H. Shibata; H. Ohta; O. Haruyama; N. Nishiyama; A. Inoue; Y. Waseda, Lead, The electrical resistivity values of Pd40Cu30Ni10P20 alloy in the supercooled liquid and liquid states have been measured by the direct current four probe technique and the experimental uncertainty of electrical resistivity was found to be +/-2.2%. The electrical resistivity values of Pd40Cu30Ni10P20 alloy show negative temperature dependence in the supercooled liquid and liquid states. It was also suggested from analysis with the Wiedemann-Franz law that principal mechanism for thermal conduction of Pd40Cu30Ni10P20 alloy is likely to be controlled by electron in the supercooled liquid and liquid states., JAPAN INST METALS
Materials Transactions, 2004, [Reviewed]

Systematic measurement of thermal diffusivity of Pd40Cu40-xNixP20 (x=0,10,40) alloys in liquid, glassy, crystallized, and supercooled liquid states by the laser flash method
T. Nishi; H. Shibata; H. Ohta; N. Nishiyama; A. Inoue; Y. Waseda, Lead, The availability of the thermal diffusivity values, α, of alloy liquids and their glassy states is very limited at the present time, although the thermal diffusivity values of alloy liquids might have a close relationship with their glass-forming ability. Thus, the purpose of this work is to determine the thermal diffusivity values of three particular alloys, Pd 40Cu30Ni10P20, Pd 40Ni40P20, and Pd40Cu 40P20, in the liquid state, systematically obtained using a laser flash method involving a novel sample cell. In the liquid state, the thermal diffusivity value of the Pd40Cu30Ni 10P20 alloy showing an outstandingly high glass-forming ability is lower than that of the Pd40Ni40P20 alloy and it is much lower than that of the Pd40Cu40P 20 alloy which has a low glass-forming ability. With respect to the thermal diffusivity values of the Pd40Cu30Ni 10P20 alloy, a positive temperature dependence was certainly obtained in all conditions: The glassy, supercooled liquid, and liquid states.
Physical Review B, 2004, [Reviewed]

Heat Capacity Measurements of Ti-Al Intermetallic Compounds by Heat-Flux Type Differential Scanning Calorimetry with a Triple-cell System
H. Inoue; S. Sato; T. Nishi; Y. Waseda, The heat capacities of TiAl and Ti3Al intermetallic compounds in the temperature range between 600 and 1425K have been determined by the heat-flux type differencial scanning calorimeter (DSC). The deviation of the heat capacity value of the synthetic sapphire of alpha-Al2O3 from the reference data was estimated to be within +/-3%. The heat capacity values obtained in this work for TiAl and Ti3Al intermetallic compounds are given as follows.
[GRAPHICS]
The experimental uncertainty of the order of +/- 10% should be suggested for Ti-Al intermetallic, compounds and this is mainly attributed to a condition that the sufficient amount of the sample is not available., FREUND PUBLISHING HOUSE LTD
High Temperature Materials and Processes, 2004, [Reviewed]

Evaluation of the Heat Leakage in the Thermal Diffusivity Measurement of Molten Metals by a Laser Flash Method
T. Nishi; H. Ohta; H. Shibata; Y. Waseda, Lead, Evaluation of the radiative and conductive heat loss from a molten metal sample to the cell has been made in order to obtain accurate thermal diffusivities of molten metals at high temperature with a laser flash method. The results suggest that thermal diffusivity values of molten nickel can be determined in the temperature range from 1728 to 1928 K with an uncertainty of +/-3% in comparison with case considering only the effect of radiative heat loss. The usefulness of a cell for a laser flash method has been confirmed by applying simulated results to evaluate the heat leakage in the thermal diffusivity measurement of molten metals., KLUWER ACADEMIC/PLENUM PUBL
International Journal of Thermophysics, 2003, [Reviewed]

Thermal Diffusivities and Conductivities of Molten Germanium and Silicon
T. Nishi; H. Shibata; H. Ohta, Lead, Thermal diffusivity values of molten germanium and silicon were measured by a laser flash method. Simple but useful sample cell systems were developed to keep the molten germanium and silicon shape uniform for a given thickness. In the present experimental condition, it is necessary to consider the effect of not only the radiative heat loss but also the conductive heat loss at the interface between the molten sample and the cell material under the present experimental conditions. However, the computer simulation results suggest that the conductive heat loss is found to be negligibly small. The thermal diffusivity values of molten germanium and silicon are given in the following equations (unit: m(2)/s).
alpha(Ge) = 1.40 x 10(-8) (T - 1218) + 2.29 x 10(-5) 1218 less than or equal to T less than or equal to 1398 (unit: K)
alpha(Si) = 4.48 x 10(-9) (T - 1685) + 2.23 x 10(-5) 1685 less than or equal to T less than or equal to 1705 (unit: K)., JAPAN INST METALS
Materials Transactions, 2003, [Reviewed]

Thermal Conductivities of Molten Iron, Cobalt, and Nickel by Laser Flash Method
T. Nishi; H. Shibata; H. Ohta; Y. Waseda, Lead, New attempts were made for the measurement of thermal diffusivity of molten iron, cobalt, and nickel at temperatures close to 1900 K by a laser flash method. A simple but useful sample cell system was developed to keep the molten metal shape uniform for a given thickness. It is also necessary to consider the effect of not only the radiative heat loss but also the conductive heat loss at the interface between the molten metal sample and the sample cell material under the present experimental conditions. The conductive heat loss was found, through computational simulation, to be negligibly small for the present laser flash measurements. Thermal conductivity values of molten iron, cobalt, and nickel were calculated by combining the present thermal diffusivity data with specific heat and density, and the resulting values are given in the following equations (unit: W m(-1) K-1)
lambda(Fe) = 2.15 X 10(-2) (T - 1818) + 33.3 1818 less than or equal to T less than or equal to 1868 (unit: K)
lambda(Co) = 2.79 X 10(-2) (T - 1768) + 30.4 1768 less than or equal to T less than or equal to 1838 (unit: K)
lambda(Ni) = 2.30 X 10(-2) (T - 1728) + 53.0 1728 less than or equal to T less than or equal to 1908 (unit: K)., MINERALS METALS MATERIALS SOC
Metallurgical and Materials Transactions A, 2003, [Reviewed]

Thermal Diffusivity Measurements of Oxide and Metallic Melts at High Temperature by the Laser Flash Method
Y. Waseda; H. Ohta; H. Shibata; T. Nishi, An attempt has been made to describe the current status on thermal diffusivity measurement of oxide and metallic melts by the laser flash method in the temperature range between 1000 and 2000 K. This paper is to provide the principle and the new data processing for the laser-flash methods, including some selected examples of their application in determining thermal diffusivity of oxide and metallic melts at high temperature.
To overcome experimental difficulties at high temperature, a differential scheme without information of the absolute value of sample thickness was used in the oxide melt case with the help of a numerical technique to estimate the effect of radiative heat transfer in the cell system where the absorption and emission behavior of the radiative component in the sample layer were considered. For metallic melts, a new simple cell system was developed to keep a precise value of sample thickness and the effect of conductive or radiative heat leak from sample was also taken into account., FREUND PUBLISHING HOUSE LTD
High Temperature Materials and Processes, 2002, [Reviewed]

Measurement of thermal diffusivity of steels at elevated temperature by a laser flash method
T. Nishi; H. Shibata; K. Tsutsumi; H. Ohta; Y. Waseda, Lead, In order to obtain thermal diffusivity of steels at elevated temperature with sufficient reliability using a laser flash method, an accurate value of specimen thickness is essentially required. Accordingly, a linear thermal expansion coefficient of steels was systematically measured in the temperature range from room temperature to 1676 K. Since the decrease in specimen thickness was detected after the measurement of thermal diffusivity under vacuum at high temperature close to solidus, such a factor was quantitatively estimated from the thickness values of quenched specimens. Combining these two results, the thermal diffusivity values were successfully determined for ultra low carbon, low carbon, medium carbon, 1.2% silicon, 9% nickel and 13% chromium steels in the temperature range from room temperature to 1676 K using the laser flash method., IRON STEEL INST JAPAN KEIDANREN KAIKAN
ISIJ international, 2002, [Reviewed]

Development of In-House Fast X-ray Diffraction Apparatus and Application to the Supercooled Liquid Pd40Ni10Cu30P20 Alloy
S. Sato; T. Nishi; E. Matsubara; M. Imafuku; N. Nishiyama; Y. Waseda; A. Inoue, Corresponding, A fast X-ray diffraction apparatus has been developed for obtaining the local structures of bulk metallic glasses at the supercooled liquid state by applying the Debye Scherrer camera geometry in combination with a curved position sensitive proportional counter. This arrangement makes it possible to eliminate the time loss due to angular motion of a counter and to do a very short time X-ray measurement when using the conventional in-house X-ray source. The usefulness of this new apparatus was confirmed by obtaining the radial distribution functions of silicon powder and SiO2 glass sample within one hundred seconds. Then, the short-range ordering structure of the supercooled liquid Pd40Ni10Cu30P20 alloy was observed as a function of time at 583 K. (C) 2002 Elsevier Science Ltd. All rights reserved., IOP PUBLISHING LTD
Science and Technology of Advanced Materials, 2002, [Reviewed]

In-situ X-ray Observation of a Local Structural Change during Crystallization
T. Nishi; K. Uematsu; S. Sato; E. Matsubara; A. Inoue; Y. Waseda, Lead, An X-ray apparatus for in-situ observation of a scattering intensity of supercooled liquid at an elevated temperature as a function of annealing time has been developed in combination with an in-house X-ray source and a curved position sensitive proportional counter (PSPC). By adopting the Debye-Scherrer camera geometry, a quantitative intensity profile of a silica glass of 2 mm diameter was obtained for 10 s and similarly that of a Pd40Ni10Cu30P20 amorphous wire of 0.2 mm diameter for 100 s. A change of local atomic structures during annealing in supercooled Pd40Ni10Cu30P20 liquid has been determined., JAPAN INST METALS
Proceedings of Fourth Pacific Rim International Conference on Advanced Materials and Processing, 2001

Surface structures of lead deposited on Mo(110)surface
S. Jo; Y. Gotoh; T. Nishi; D. Mori; T. Gonda, The surface structures of lead deposited on an Mo(110) surface were studied by means of reflection high-energy electron diffraction (RHEED) and scanning electron microscopy (SEM). Four kinds of surface structure were observed. Three surface structures appeared at nearly one monolayer of lead coverage at room temperature. All surface structures have large unit cells that coincide with the atomic arrangement of the molybdenum substrate. The growth modes of the Pb/Mo(110) system are the Frank-van der Merwe growth mode at room temperature and the Stranski-Krastanov growth mode at high temperatures. The epitaxial orientation relationship of the Pb/Mo(110) system is [ (1) over bar 10](Pb)parallel to[001](Mo), (111)(Pb)parallel to(110)(Mo). (C) 2000 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
Surface Science, 2000, [Reviewed]

EVALUATION OF THERMAL CONDUCTIVITY OF ALUMINOSILICATE MALTS
黒江怜史; 西剛史; 太田弘道; 助永壮平; 柴田浩幸
Thermophysical Properties (CD-ROM), 2021

EVALUATION OF THERMAL CONDUCTIVITY OF MOLTEN CaO-CaF₂-SiO₂ SLAG
南部大輝; 西剛史; 太田弘道; 助永壮平; 柴田浩幸
Thermophysical Properties (CD-ROM), 2021

第4回茨城大学量子線科学国際シンポジウム報告　　　　　　　　　　　　　　　
西 剛史
まてりあ, Feb. 2020, [Reviewed]
Lead

THERMAL CONDUCTIVITY OF IRON-BEARING ALKALINE-EARTH SILICATE SLAGS
真山知大; 西剛史; 太田弘道; 眞子巧巳; 大和佳史; 上田直希; 助永壮平; 柴田浩幸
Thermophysical Properties, 2019

THERMAL CONDUCTIVITY OF B₂O₃-R_xO-SiO₂ (R=Na,K,Mg,Ca) MELTS
眞子巧巳; 西剛史; 真山知大; 大和佳史; 太田弘道; 上田直希; 助永壮平; 柴田浩幸
Thermophysical Properties, 2019

ホウケイ酸塩融体の熱伝導率　　　　　　　　　　　　　　　
西 剛史; 太田弘道
まてりあ, 2019, [Reviewed]
Lead

SiO₂-AlO_1.5-R₂O(R=Li,Na)融体状態およびガラス状態の熱伝導率測定
眞子巧巳; 田中健登; 大沼克也; 太田弘道; 西剛史; 助永壮平; 柴田浩幸; 柿沼敏明
日本金属学会講演概要(CD-ROM), 2018

Dependence of addition of TiO₂, ZnO, and ZrO₂ on thermal conductivity of Al₂O₃-B₂O₃-CaO-Na₂O-SiO₂ melts
大沼克也; 眞子巧巳; 大和佳史; 太田弘道; 西剛史; 柴田浩幸; 助永壮平
Thermophysical Properties, 2018

Thermophysical Properties of High-Temperature Melts and Materials Processing　　　　　　　　　　　　　　　
T. Nishi; R. Endo
Neteu Bussei, 2018
Lead

EVALUATION AND INVESTIGATION OF THERMAL DIFFUSIVITY OF COMPOSITE MATERIALS BY SPOT PERIODIC HEATING AND RADIANT TEMPERATURE MEASUREMENT
篠原貴洸; 太田弘道; 西剛史; 羽鳥仁人; 野口秀則; 神田昌枝
Thermophysical Properties, 01 Nov. 2017

二元系硼珪酸塩融体の熱伝導率の組成依存性の検討
大沼克也; 太田弘道; 西剛史; 田中健登; 柴田浩幸; 助永壮平; 柿原敏明; 川島英典; 内山翠
日本金属学会講演概要(CD-ROM), 2017

サーモウェーブアナライザを用いた複合材料の熱拡散率の異方性に関する検討
篠原貴洸; 太田弘道; 西剛史; 羽鳥仁人; 野口秀則; 粟野孝昭; 神田昌枝; 西義武
Thermophysical Properties, 28 Nov. 2016

サーモウェーブアナライザを用いた複合材料の熱拡散率測定
篠原貴洸; 太田弘道; 西剛史; 羽鳥仁人; 野口秀則; 粟野孝昭; 神田昌枝; 西義武
日本金属学会講演概要(CD-ROM), 09 Mar. 2016

Oxidation behavior and some material properties of sintered (U,Zr)O$_{2}$ specimens　　　　　　　　　　　　　　　
Takano, Masahide; Nishi, Tsuyoshi; Sudo, Ayako
Nuclear Materials Conference 2014 (NuMat 2014), Oct. 2014

Property Database of TRU Nitride Fuel　　　　　　　　　　　　　　　
T. Nishi; Y. Arai; M. Takano; M. Kurata
JAEA-Data/Cod, 2014
Lead

Recent advances in material properties and behavior of transuranium compounds for application to nuclear fuel cycle　　　　　　　　　　　　　　　
Takano, Masahide; Nishi, Tsuyoshi; Hayashi, Hirokazu; Nakajima, Kunihisa; Otobe, Haruyoshi
9th International Conference on the Chemistry and Physics of the Actinide Elements (ACTINIDES 2013), Jul. 2013

マイナーアクチノイド化合物熱拡散率測定装置の整備（受託研究）　　　　　　　　　　　　　　　
西 剛史; 高野 公秀; 伊藤 昭憲; 赤堀 光雄; 湊 和生; 木崎 實
JAERI-Tech, 2005
Lead

金属融体の熱拡散率・熱伝導率測定　　　　　　　　　　　　　　　
西 剛史; 柴田浩幸; 太田弘道; 早稲田嘉夫
素材工学研究彙報, 2002
Lead

<記事>組成評価研究分野 (2000.1-2000.12)(研究活動報告)
早稲田 嘉夫; 井上 博文; 齋藤 正敏; 柴田 浩幸; 高橋 英志; 津 宇一; 鈴木 淳; 武山 昭徳; 宮下 正己; 大久保 和也; 中村 貴宏; 西 剛史; Kang Shinchul; Mitev Pavlin D; Zhou Bingyi; Shinohara Armando H
東北大学素材工学研究所彙報, 01 Mar. 2001

<記事>組成評価研究分野 (1999.1-1999.12) (研究活動報告)
早稲田 嘉夫; 井上 博文; 齋藤 正敏; 柴田 浩幸; 高橋 英志; 津 宇一; 宇田 哲也; Darjaa T; 石山 理; 今永 拓男; 斉藤 孝明; 鈴木 淳; 武山 昭徳; 宮下 正己; 大久保 和也; 中村 貴宏; 西 剛史; Kang Shin Chul; Mitev Pavlin Dakev; Zhou Bingyi
東北大学素材工学研究所彙報, 1999

Development of High Heat-Resistant and High Heat-Dissipating Materials for Next-Generation Power Devices and Thermal Management　　　　　　　　　　　　　　　
山藤 靖一郎; 工藤 直人; 羽鳥 仁人; 西 剛史; 太田 弘道
Aug. 2024

熱伝導率測定の種類とメカニズム、用途別の選択法と使い方　　　　　　　　　　　　　　　
西 剛史, Single work
技術情報協会, 18 Aug. 2021

「高熱伝導材料」 第11章 第3節「スポット周期加熱放射測温法を用いた高熱伝導放熱シートの熱拡散率測定の現状」　　　　　　　　　　　　　　　
西 剛史, Single work
技術情報協会, Jul. 2019

テキスト「核燃料サイクル」　　　　　　　　　　　　　　　
松村 達郎; 佐藤 匠; 西 剛史, Joint work
日本原子力学会, Jul. 2015

Comprehensive Nuclear Materials, 2.03 Thermodynamics and Thermophysical Properties of the Actinide Nitrides　　　　　　　　　　　　　　　
Masayoshi Uno; Tsuyoshi Nishi; Masahide Takano, Joint work
Elsevier, Feb. 2012

アルカリアルミノケイ酸塩融体の熱伝導率評価の現状　　　　　　　　　　　　　　　
西剛史; 太田弘道; 遠藤理恵; 清水雅弘; 助永壮平; 柴田浩幸
第189回春季講演大会「溶融酸化物およびガラスの熱物性評価の進展」討論会, 10 Mar. 2025
20250308, 20250310

Na2O-Al2O3-SiO2融体の熱伝導率評価　　　　　　　　　　　　　　　
的場 嵩将; 黒岩 直輝; 飯島 賢; 西 剛史; 太田 弘道; 助永 壮平; 柴田 浩幸
2025年 日本金属学会春期講演大会, 08 Mar. 2025
20250308, 20250310

るつぼ回転粘度計を用いた0.5NaCl-0.5CaCl2融体の粘度測定　　　　　　　　　　　　　　　
川上 春香; 奈良 日花里; 西 剛史; 太田 弘道; 福島 昌宏; 西原 健司
2025年 日本金属学会春期講演大会, 08 Mar. 2025
20250308, 20250310

るつぼ回転粘度計を用いた低濃度炭化ホウ素-ステンレス鋼 溶融混合物の粘度測定　　　　　　　　　　　　　　　
金子 睦美; 山本 泰生; 西 剛史; 太田 弘道; 山野 秀将
2025年 日本金属学会春期講演大会, 08 Mar. 2025
20250308, 20250310

Mn, Ca, Tiをドープしたτ₁-Al₂Fe₃Si₃熱電変換材料の熱浸透率分布測定　　　　　　　　　　　　　　　
小澤 杏佳; 西場 穂佳; 工藤 直人; 阿部 龍清; 西 剛史; 太田 弘道; 池田 輝之
2025年日本金属学会春期講演大会, 08 Mar. 2025
20250308, 20250310

熱物性顕微鏡を用いた金型コーティング被膜の熱浸透率測定　　　　　　　　　　　　　　　
寺門 侑真; 西 剛史; 西野創一郎
評価・分析・解析部会 材料プロセスにおける物性評価と物性予測のアプローチフォーラム 「材料プロセスにおける物性評価と物性予測の現状と課題」シンポジウム, 04 Dec. 2024
20241204, 20241204

るつぼ回転粘度計を用いた溶融錫合金の粘度測定　　　　　　　　　　　　　　　
奈良 日花里; 西 剛史; 太田 弘道
第45回日本熱物性シンポジウム, 30 Oct. 2024
20241028, 20241030

実用ホウケイ酸塩融体の熱伝導率評価　　　　　　　　　　　　　　　
川畑 優; 西 剛史; 太田 弘道; 太田 祐希; 畠山 克彦
第45回日本熱物性シンポジウム, 30 Oct. 2024
20241028, 20241030

三元系ホウケイ酸塩融体の熱伝導率評価　　　　　　　　　　　　　　　
飯島 賢; 西 剛史; 太田 弘道; 助永 壮平; 柴田 浩幸
第45回日本熱物性シンポジウム, 30 Oct. 2024
20241028, 20241030

るつぼ回転粘度計を用いた塩化ネオジムを添加した溶融塩化鉛の粘度測定　　　　　　　　　　　　　　　
西 剛史; 奈良 日花里; 佐藤 理花; 太田 弘道; 菅原 隆徳; 西原 健司
第45回日本熱物性シンポジウム, 30 Oct. 2024
20241028, 20241030

これまでの私の物性測定研究と今後の展開　　　　　　　　　　　　　　　
西 剛史
日本実験力学会 2024 年度年次講演会, 17 Sep. 2024
20240917, 20240919

熱物性顕微鏡を用いた基板上樹脂薄膜の熱浸透率測定　　　　　　　　　　　　　　　
工藤 直人; 竹澤 由高; 会社レゾナック; 西 剛史; 太田 弘道
日本実験力学会 2024 年度年次講演会, 17 Sep. 2024
20240917, 20240919

熱物性顕微鏡を用いた模擬月砂(FJS-1)単一粒子の熱物性分布測定　　　　　　　　　　　　　　　
日本金属学会2024年春期(第174回)講演大会, 12 Mar. 2024
20240312, 20240315

Li2O-B2O3-SiO2融体の熱伝導率評価　　　　　　　　　　　　　　　
日本金属学会2024年春期(第174回)講演大会, 12 Mar. 2024
20240312, 20240315

最適な FAST材料探索のための熱浸透率測定　　　　　　　　　　　　　　　
日本金属学会2024年春期(第174回)講演大会, 12 Mar. 2024
20240312, 20240315

るつぼ回転粘度計を用いた溶融球状黒鉛鋳鉄(FCD)の粘度測定　　　　　　　　　　　　　　　
日本金属学会2024年春期(第174回)講演大会, 12 Mar. 2024
20240312, 20240315

アルカリホウケイ酸塩融体の熱伝導率評価　　　　　　　　　　　　　　　
飯島 賢、西 剛史
日本鉄鋼協会 評価・分析・解析部会 高温における最適な材料プロセス制御を目指した材料特性評価フォーラムシンポジウム, 05 Feb. 2024
20240205, 20240205

模擬月砂粒子の熱浸透率分布測定　　　　　　　　　　　　　　　
中山由菜、西 剛史
日本鉄鋼協会 評価・分析・解析部会 高温における最適な材料プロセス制御を目指した材料特性評価フォーラムシンポジウム, 05 Feb. 2024
20240205, 20240205

Fe-Al-Si系熱電材料探索のための熱浸透率測定　　　　　　　　　　　　　　　
西場穂佳、西 剛史
日本鉄鋼協会 評価・分析・解析部会 高温における最適な材料プロセス制御を目指した材料特性評価フォーラムシンポジウム, 05 Feb. 2024
20240205, 20240205

るつぼ回転粘度計を用いた球状黒鉛鋳鉄（FCD）の粘度測定　　　　　　　　　　　　　　　
山本泰生、西 剛史
日本鉄鋼協会 評価・分析・解析部会 高温における最適な材料プロセス制御を目指した材料特性評価フォーラムシンポジウム, 05 Feb. 2024
20240205, 20240205

Thermal Property Measurement of Lunar Regolith Simulant (JSC-1A) by Thermal Microscopy　　　　　　　　　　　　　　　
Shunsuke Watanabe; Naoto Kudo; Wan-Ting Chiu; Tsuyoshi Nishi; Hiromichi Ohta; Hideki Hosoda; Sumitaka Tachikawa; Rie Endo
The 8th International Symposium on Biomedical Engineering(ISBE2023 ) / International Workshop on Nanodevice Technologies 2023 (IWNT2023), 22 Nov. 2023
20231120, 20231122

るつぼ回転粘度計を用いた鉛フリーはんだの粘度測定
奈良日花里、西 剛史、太田弘道
The 44th Japan Symposium on Thermophysical Properties, 09 Nov. 2023, JSTP
20231107, 20231109

熱物性顕微鏡を用いた模擬月砂の熱浸透率分布測定
工藤直人、渡辺俊介、西 剛史、太田弘道、太刀川純孝、遠藤理恵
The 44th Japan Symposium on Thermophysical Properties, 07 Nov. 2023, JSTP
20231107, 20231109

R2O-Al2O3-SiO2 (R=Li, Na, K) 融体の熱伝導率評価　　　　　　　　　　　　　　　
黒岩直輝、西 剛史、太田弘道、助永壮平、柴田浩幸
日本鉄鋼協会第186回秋季講演大会, 21 Sep. 2023, 日本鉄鋼協会
20230920, 20230922

Densities, Surface-tensions, and Viscosities of Molten Ni-based Superalloys
T. Nishi; S. Matsumoto; K. Hayashi; M. Roberto Bellé; L. Neubert; G. Bartzsch; O. Volkova
22nd CONFERENCE EUROPEAN CONFERENCE ON THERMOPHYSICAL PROPERTIES, ECTP, 13 Sep. 2023
20230911, 20230913

Measurement of phase fraction in simulated lunar regolith and evaluation of average thermal conductivity
S. Watanabe; N. Kudo; T. Nishi; H. Ohta; S. Tachikawa; R. Endo
22nd CONFERENCE EUROPEAN CONFERENCE ON THERMOPHYSICAL PROPERTIES, ECTP, 12 Sep. 2023
20230911, 20230913

Determination of average thermal conductivity for a lunar regolith simulant particle by using thermal microscope
N. Kudo; S. Watanabe; T. Nishi; H. Ohta; S. Tachikawa; R. Endo
22nd CONFERENCE EUROPEAN CONFERENCE ON THERMOPHYSICAL PROPERTIES, ECTP, 12 Sep. 2023
20230911, 20230913

Densities, Surface-tensions, and Viscosities ,of Molten Ni-based Superalloys
T. Nishi; S. Matsumoto; K. Hayashi; M. Roberto Bellé; L. Neubert; G. Bartzsch; O. Volkova
22nd CONFERENCE EUROPEAN CONFERENCE ON THERMOPHYSICAL PROPERTIES (ECTP2023), 13 Sep. 2021
20230911, 20230913

熱物性顕微鏡を用いた模擬月砂の熱浸透率分布測定　　　　　　　　　　　　　　　
工藤直人、菅沼友仁、渡辺俊介、西 剛史、太田弘道、太刀川純孝、遠藤理恵
日本金属学会2023年春期（第172回）講演大会, 07 Mar. 2023, 日本金属学会
20230307, 20230307

模擬月砂中の相割合の測定と平均熱伝導率の算出　　　　　　　　　　　　　　　
渡辺俊介、西 剛史、太田弘道、太刀川純孝、遠藤理恵
日本金属学会2023年春期（第172回）講演大会, 07 Mar. 2023, 日本金属学会
20230307, 20230307

基板に塗布された液晶エポキシ樹脂の熱浸透率直接測定　　　　　　　　　　　　　　　
及川太暉、竹澤吉高、西 剛史、太田弘道
日本金属学会2023年春期（第172回）講演大会, 07 Mar. 2023, 日本金属学会
20230307, 20230307

るつぼ回転粘度計を用いた鉛フリーはんだの粘度測定　　　　　　　　　　　　　　　
奈良日花里、佐藤理花、西 剛史、太田弘道
日本金属学会2023年春期（第172回）講演大会, 07 Mar. 2023, 日本金属学会
20230307, 20230307

表面加熱・表面測温レーザフラッシュ法による溶融Li2O-Al2O3-SiO2の熱浸透率測定
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「材料プロセス制御に向けた熱物性評価および今後の課題」, 09 Feb. 2023, 日本鉄鋼協会 評価・分析・解析部会
20230209, 20230209

ガラス・金属基板に塗布されたエポキシ樹脂の熱浸透率測定
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「材料プロセス制御に向けた熱物性評価および今後の課題」, 09 Feb. 2023, 日本鉄鋼協会 評価・分析・解析部会
20230209, 20230209

るつぼ回転粘度計を用いたはんだ合金の粘度測定
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「材料プロセス制御に向けた熱物性評価および今後の課題」, 09 Feb. 2023, 日本鉄鋼協会 評価・分析・解析部会
20230209, 20230209

表面加熱・表面測温レーサフラッシュ法による溶融Li2O-Al2O3-SiO2の熱浸透率測定
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「材料プロセス制御に向けた熱物性評価および今後の課題」, 09 Feb. 2023, 日本鉄鋼協会 評価・分析・解析部会
20230209, 20230209

模擬月砂の熱浸透率分布測定
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「材料プロセス制御に向けた熱物性評価および今後の課題」, 09 Feb. 2023, 日本鉄鋼協会 評価・分析・解析部会
20230209, 20230209

これまでの熱物性研究と今後の展開
西 剛史
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「材料プロセス制御に向けた熱物性評価および今後の課題」, 09 Feb. 2023, 日本鉄鋼協会 評価・分析・解析部会
20230209, 20230209

アルカリアルミノケイ酸塩融体の熱伝導率評価　　　　　　　　　　　　　　　
黒岩 直輝; 西 剛史; 太田 弘道; 助永 壮平; 柴田 浩幸
第 43 回日本熱物性シンポジウム, 25 Oct. 2022, 日本熱物性学会
20221025, 20221027

溶融塩の密度・粘度測定　　　　　　　　　　　　　　　
佐藤 理花; 西 剛史; 太田 弘道; 林 博和; 菅原 隆徳; 西原 健司
第 43 回日本熱物性シンポジウム, 25 Oct. 2022, 日本熱物性学会
20221025, 20221027

CaF2-CaO-SiO2融体の熱伝導率と粘度の関係　　　　　　　　　　　　　　　
南部大輝、西 剛史
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「高温融体の物性評価の現状ならびに材料プロセスに必要な物性評価の課題」, 23 Sep. 2022
20220923, 20220923

Li2O-Al2O3-SiO2の熱伝導メカニズム解明に向けての取り組み　　　　　　　　　　　　　　　
黒岩直輝、西 剛史
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「高温融体の物性評価の現状ならびに材料プロセスに必要な物性評価の課題」, 23 Sep. 2022
20220923, 20220923

るつぼ回転粘度計を用いた塩化鉛および硝酸カリウムの粘度測定　　　　　　　　　　　　　　　
佐藤理花、西 剛史
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「高温融体の物性評価の現状ならびに材料プロセスに必要な物性評価の課題」, 23 Sep. 2022
20220923, 20220923

ファイアライトおよび酸化スケールの熱浸透率分布測定　　　　　　　　　　　　　　　
菅沼友仁、西 剛史
日本鉄鋼協会 評価・分析・解析部会 シンポジウム「高温融体の物性評価の現状ならびに材料プロセスに必要な物性評価の課題」, 23 Sep. 2022
20220923, 20220923

多様なオキソアニオンを含むガラスの構造と物性の関連性評価　　　　　　　　　　　　　　　
鈴木茂,西剛史,助永壮平,篠田弘造,柴田浩幸
日本鉄鋼協会 2022年秋季（第184回）講演大会, 22 Sep. 2022, 日本鉄鋼協会
20220922, 20220922

キャリア濃度を変化させたSi単結晶のフォノン平均自由行程の評価とフォノンドラッグ効果が寄与するゼーベック係数の導出　　　　　　　　　　　　　　　
長谷匡高,谷澤大樹,工藤直人,永田將,西剛史,三宅修吾,高尻 雅之
第83回応用物理学会秋季学術講演会, 21 Sep. 2022, 日本応用物理学会
20220919, 20220921

Si単結晶におけるフォノン・電子平均自由行程のキャリア濃度依存性評価　　　　　　　　　　　　　　　
長谷匡高,谷澤大樹,工藤直人,永田將,西剛史,三宅修吾,高尻 雅之
日本機械学会2022年度年次大会, 14 Sep. 2022, 日本応用物理学会

溶融塩化鉛の密度・粘度測定　　　　　　　　　　　　　　　
佐藤 理花、西 剛史、太田 弘道、菅原 隆徳、西原 健司
日本原子力学会2022年秋の大会, 07 Sep. 2022, 日本原子力学会
20220907, 20220909

PN 接合構造を持つ CNT デバイスの局所光照射による熱電発電　　　　　　　　　　　　　　　
小森貴文,則正雄賀,岡田一真,永田將,西剛史,三宅修吾,宮崎康次,高尻雅之
第19回日本熱電学会学術講演会(TSJ2022), 09 Aug. 2022, 日本熱電学会

熱物性顕微鏡を用いた Fayalite 粒子の熱伝導分布測定　　　　　　　　　　　　　　　
菅沼友仁、西 剛史
日本鉄鋼協会 評価・分析・解析部会「高温・材料プロセス制御に係る熱物性評価の現状」シンポジウム, 12 May 2021
20220512, 20220512

二元系アルカリケイ酸塩融体の熱伝導率評価　　　　　　　　　　　　　　　
黒岩直輝、西剛史、太田弘道、助永壮平、柴田浩幸
第183回 日本鉄鋼協会 春季講演大会, 16 Mar. 2022
20220316, 20220318

るつぼ回転振動法によるNi基超合金の粘度測定　　　　　　　　　　　　　　　
松本早織、西 剛史、太田弘道、堀 亜由美、山野秀将
第183回 日本鉄鋼協会 春季講演大会, 16 Mar. 2022
20220316, 20220318

るつぼ回転粘度計を用いたニッケル超合金の粘度測定　　　　　　　　　　　　　　　
松本早織、西 剛史
日本鉄鋼協会 評価・分析・解析部会,高温における最適な材料プロセス制御を目指した材料特性評価フォーラムシンポジウム, 22 Dec. 2021
20211222, 20211222

二元系アルカリケイ酸塩融体の熱伝導率評価　　　　　　　　　　　　　　　
黒岩直輝、西 剛史
日本鉄鋼協会 評価・分析・解析部会,高温における最適な材料プロセス制御を目指した材料特性評価フォーラムシンポジウム, 22 Dec. 2021
20211222, 20211222

るつぼ回転粘度計を用いた鋳物用ステンレス鋼の粘度測定　　　　　　　　　　　　　　　
高塚祐理子、西 剛史
日本鉄鋼協会 評価・分析・解析部会,高温における最適な材料プロセス制御を目指した材料特性評価フォーラムシンポジウム, 22 Dec. 2021
20211221, 20211221

氷熱量計を用いた鋳造用押湯スリーブ材の発熱量測定　　　　　　　　　　　　　　　
ゴニュホアン、西 剛史、加賀美将、太田弘道
第42回日本熱物性シンポジウム, 26 Oct. 2021, 日本熱物性学会
20211025, 20211027

新しい粘度解析システムを用いたるつぼ回転粘度計によるB4Cーステンレス鋼共晶溶融物の粘度測定　　　　　　　　　　　　　　　
佐藤理花、西 剛史、太田弘道、山野秀将
第42回日本熱物性シンポジウム, 25 Oct. 2021, 日本熱物性学会
20211025, 20211027

溶融CaO-CaF2-SiO2系スラグの熱伝導率評価　　　　　　　　　　　　　　　
南部大輝、西 剛史、太田弘道、助永壮平、柴田浩幸
第42回日本熱物性シンポジウム, 25 Oct. 2021, 日本熱物性学会
20211025, 20211027

アルミノケイ酸塩融体の熱伝導率評価　　　　　　　　　　　　　　　
黒江怜史、西 剛史、太田弘道、助永壮平、柴田浩幸
第42回日本熱物性シンポジウム, 25 Oct. 2021, 日本熱物性学会
20211025, 20211027

熱物性顕微鏡を用いたファイアライトの熱浸透率測定　　　　　　　　　　　　　　　
菅沼友仁、太田弘道、西 剛史、羽鳥仁人、遠藤理恵
第42回日本熱物性シンポジウム, 25 Oct. 2021, 日本熱物性学会
20211025, 20211027

Marchison隕石の熱物性評価　　　　　　　　　　　　　　　
遠藤理恵、八木貴志、菅沼友仁、西 剛史、太田弘道、坂谷尚哉、太刀川純孝、田中智
第42回日本熱物性シンポジウム, 25 Oct. 2021, 日本熱物性学会
20211025, 20211027

熱物性顕微鏡による模擬月砂の熱浸透率測定　　　　　　　　　　　　　　　
遠藤理恵、菅沼友仁、西 剛史、太田弘道、太刀川純孝
第42回日本熱物性シンポジウム, 25 Oct. 2021, 日本熱物性学会
20211025, 20211027

レーザスポット周期加熱法における面内熱拡散率評価法の開発　　　　　　　　　　　　　　　
永田 將、西 剛史、太田弘道、五十嵐誉廣、三宅修吾
日本機械学会 2021年度 年次大会, 07 Sep. 2021
20210906, 20210908

４．【事例紹介】ケイ酸塩融体の熱伝導率および金属（合金）融体の粘度測定について　　　　　　　　　　　　　　　
西 剛史
熱伝導率測定の種類とメカニズム，用途別の選択法と使い方, 18 Aug. 2021, 技術情報協会, [Invited]
20210818, 20210818

新しいるつぼ回転粘度計を用いた高温合金の粘度測定　　　　　　　　　　　　　　　
佐藤理花、西 剛史
日本鉄鋼協会 評価・分析・解析部会「高温・材料プロセス制御に係る熱物性評価の現状」シンポジウム, 12 May 2021
20210512, 20210512

溶融ケイ酸塩の熱伝導率評価の現状　　　　　　　　　　　　　　　
西 剛史
評価・分析・解析部会「高温・材料プロセス制御に係る熱物性評価の現状」シンポジウム, 12 May 2021
20210512, 20210512

氷熱量計を用いた鋳造用スリーブの発熱量測定　　　　　　　　　　　　　　　
根崎史歩、西 剛史、太田弘道
日本鉄鋼協会 2021年第181回春季講演大会, 17 Mar. 2021
20210316, 20210318

溶融CaO-CaF2-Al2O3系スラグの熱伝導率評価　　　　　　　　　　　　　　　
南家一博、太田弘道、西 剛史
日本金属学会第168回講演大会, 16 Mar. 2021
20210316, 20210318

スポット周期加熱放射測温法による黒色樹脂の熱拡散率評価および検討　　　　　　　　　　　　　　　
第41回日本熱物性シンポジウム, 28 Oct. 2020, 日本熱物性学会
20201028, 20201030

熱物性顕微鏡を用いた Fe-Al-Si 系化合物の熱浸透率分布測定　　　　　　　　　　　　　　　
伊藤 俊亮; 西 剛史; 太田 弘道; 池田輝之; 松井 裕貴; 黒江 怜史; 羽鳥 仁人; 大槻 哲也
第41回日本熱物性シンポジウム, 28 Oct. 2020, 日本熱物性学会
20201028, 20201030

BaTiO3/epoxy 複合材料の熱伝導率　　　　　　　　　　　　　　　
西脇 賢; 西 剛史; 太田 弘道; 森 孝太郎
第41回日本熱物性シンポジウム, 28 Oct. 2020, 日本熱物性学会
20201028, 20201030

Viscosity measurements of molten stainless-steel containing boron-carbide　　　　　　　　　　　　　　　
Tsuyoshi Nishi; Hiromichi Ohta; Rika Sato; Yuriko Takatsuka; Hidemasa Yamano
The Nuclear Materials Conference (NuMat2020), 29 Oct. 2020, [Invited]
20201026, 20201030

Study on Eutectic Melting Behavior of Control Rod Materials in Core Disruptive Accidents ,of Sodium-Cooled Fast Reactors (23) Viscosity Measurement of 2.5mass%B4C-SS Eutectic Molten Material　　　　　　　　　　　　　　　
西 剛史; 佐藤 理花; 高塚 祐理子; 太田 弘道; 山野 秀将
日本原子力学会2020年秋の大会, 19 Sep. 2020

鋳造用スリーブの発熱量測定を目的とした氷熱量計の開発　　　　　　　　　　　　　　　
須賀美里; 西 剛史; 太田弘道; ゴニュホアン
日本鉄鋼協会 2020年春季講演大会（大会は中止）, 18 Mar. 2020

溶融CaO-CaF2-SiO2系スラグの熱伝導率評価　　　　　　　　　　　　　　　
上田 直希; 西 剛史; 太田 弘道
日本金属学会 2020年春期(第166回)講演大会（大会は中止）, 17 Mar. 2020

るつぼ回転粘度計を用いた高ニッケルステンレス鋼の粘度測定　　　　　　　　　　　　　　　
髙塚 祐理子; 西 剛史; 太田 弘道
日本金属学会 2020年春期(第166回)講演大会（大会は中止）, 17 Mar. 2020

レーザスポット周期加熱放射測温法によるレーザフラッシュ法標準物質の熱拡散率測定　　　　　　　　　　　　　　　
米倉 友哉; 西 剛史; 太田 弘道; 羽鳥 仁人; 野口 秀則
日本金属学会 2020年春期(第166回)講演大会（大会は中止）, 17 Mar. 2020

融体の熱物性（熱伝導率、粘性）　　　　　　　　　　　　　　　
西 剛史
日本伝熱学会 主催講習会 「計測技術 ～温度・熱流・熱伝導率測定の基礎と応用～」, 22 Nov. 2019, 日本伝熱学会, [Invited]

Viscosity Measurement of Molten SS-B4C alloy　　　　　　　　　　　　　　　
Hiroki Kokubo; Tsuyoshi Nishi; Hiromichi Ohta; Yuriko Takatsuka; Hidemasa yamano
The 4th International Symposium of Quantum Beam Science, 31 Oct. 2019

Thermal conductivity of iron-bearing alkaline-earth silicate slags　　　　　　　　　　　　　　　
Tomohiro Mayama; Tsuyoshi Nishi; Hiromichi Ohta; Takumu Manako; Yoshifumi Yamato; Naoki Ueda; Sohei sukenaga; Hiroyuki Shibata
The 4th International Symposium of Quantum Beam Science, 31 Oct. 2019

Additive dependence of thermal conducitivity for borosilicate melt　　　　　　　　　　　　　　　
Takumi Manako; Tsuyoshi Nishi; Tomohiro Mayama; Yoshifumi Yamato; Hiromichi Ohta; Naoki Ueda; Sohei Sukenaga; Hiroyuki Shibata
The 4th International Symposium of Quantum Beam Science, 31 Oct. 2019

XAFS study on AmO2, Am2O3, and (Am,U)O2-x　　　　　　　　　　　　　　　
Tsuyoshi Nishi
The 4th International Symposium of Quantum Beam Science, 31 Oct. 2019, [Invited]

ブンゼンカロリメトリを原理とした氷熱量計開発　　　　　　　　　　　　　　　
ゴォニュホアン; 須賀美里; 森川智仁; 太田弘道; 西 剛史
第40回 日本熱物性シンポジウム, 30 Oct. 2019

スポット周期加熱放射測温法による表面コーティング材の熱拡散率測定手法の開発　　　　　　　　　　　　　　　
林 健; 西 剛史; 太田弘道; 羽鳥仁人; 粟野孝昭; 五十嵐誉廣; 越名崇文
第40回 日本熱物性シンポジウム, 29 Oct. 2019

レーザーフラッシュ法における対数法の適用による熱損失の影響　　　　　　　　　　　　　　　
東 君儒; 西 剛史; 太田弘道
第40回 日本熱物性シンポジウム, 29 Oct. 2019

SUS-B4C溶融混合物の粘度測定　　　　　　　　　　　　　　　
小久保宏紀; 西 剛史; 太田弘道; 高塚祐理子; 山野秀将
第40回 日本熱物性シンポジウム, 29 Oct. 2019

酸化鉄を含むアルカリ土類シリケートスラグの熱伝導率　　　　　　　　　　　　　　　
真山知大; 西 剛史; 太田弘道; 眞子巧巳; 大和佳史; 上田直希; 柴田浩幸; 助永壮平
第40回 日本熱物性シンポジウム, 28 Oct. 2019

B2O3-RxO-SiO2 (R=Na, K, Mg, Ca) 融体の熱伝導率　　　　　　　　　　　　　　　
眞子巧巳; 大和佳史; 真山知大; 太田弘道; 西 剛史; 上田直希; 助永壮平; 柴田浩幸
第40回 日本熱物性シンポジウム, 28 Oct. 2019

Study on Eutectic Melting Behavior of Control Rod Materials in Core Disruptive Accidents of Sodium-Cooled Fast Reactors: (4) Effect of B4C Addition on Viscosity of Austenitic Stainless Steel in a Liquid State　　　　　　　　　　　　　　　
H. Ohta; H. Kokubo; T.Nishi; H. Yamano
Global/Top Fuel 2019, 26 Sep. 2019, American Nuclear Society

Study on Eutectic Melting Behavior of Control Rod Materials in Core Disruptive Accidents of Sodium-Cooled Fast Reactors: (1) Project Overview　　　　　　　　　　　　　　　
H. Yamano; T. Takai; T. Furukawa; S. Kikuchi; Y. Emura; K. Kamiyama; H. Fukuyama; H. Higashi; T. Nishi; H. Ohta; X. Liu; K. Morita; K. Nakamura; H. Ohta; M. Furuya
Global/Top Fuel 2019, 24 Sep. 2019, American Nuclear Society

共軸二重円筒回転粘度計を用いた溶融はんだ合金の粘度測定の精度検証　　　　　　　　　　　　　　　
小久保亮汰; 太田弘道; 西 剛史
日本金属学会2019年秋期講演, 11 Sep. 2019

BaTiO3/epoxy圧電複合材料の熱伝導率の温度依存性の解明　　　　　　　　　　　　　　　
西脇 賢; 西 剛史; 太田弘道; 森孝太郎
日本金属学会2019年秋期講演, 11 Sep. 2019

熱物性顕微鏡を用いたPbTe-Sb2Te3系化合物の熱浸透率分布測定　　　　　　　　　　　　　　　
伊藤俊亮; 太田弘道; 池田輝之; 西 剛史; 真山知大; 羽鳥仁人; 粟野孝昭; 大槻哲也
日本金属学会2019年秋期講演, 11 Sep. 2019

Evaluation of Thermal Diffusivity Using Analytical Solution by Periodic Heating Method　　　　　　　　　　　　　　　
永田將; 米倉友哉; 太田弘道; 西 剛史; 三宅修吾; 貴船天地
日本金属学会2019年秋期講演, 11 Sep. 2019

鋳造用スリーブにおける発熱量測定装置の開発　　　　　　　　　　　　　　　
森川智仁; ゴニュホアン; 西 剛史; 太田弘道; 須賀美里
日本金属学会2019年秋期講演, 11 Sep. 2019

SiO2-Al2O3-RxO (R=Li,Na,Ca) 融体の熱伝導率　　　　　　　　　　　　　　　
大和佳史; 眞子巧巳; 真山知大; 上田直希; 西 剛史; 太田弘道; 柴田浩幸; 助永壮平
日本金属学会2019年秋期講演, 11 Sep. 2019

ガラス固化用ガラスの溶融状態の熱拡散率　　　　　　　　　　　　　　　
太田弘道; 西 剛史; 眞子巧巳; 田尻康智
日本原子力学会2019年秋の大会, 11 Sep. 2019

ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究（15）7mass%B4C-SS共晶溶融物の粘度測定　　　　　　　　　　　　　　　
西 剛史; 小久保宏紀; 高塚祐理子; 太田弘道; 山野秀将
日本原子力学会2019年秋の大会, 11 Sep. 2019

XAFS study on americium oxides and americium and uranium mixed dioxide　　　　　　　　　　　　　　　
Tsuyoshi Nishi
3rd World Chemistry Conference and Exhibition (WCCE-2019), 15 Jun. 2019, [Invited]

スポット周期加熱放射測温法を用いた高熱伝導放熱シートの熱伝導率測定　　　　　　　　　　　　　　　
林健; 西剛史; 太田弘道; 羽鳥仁人; 野口秀則
第39回熱物性シンポジウム, 16 Nov. 2018

表面加熱・表面検出レーザフラッシュ法を用いた金属基板上酸化膜の熱容量測定装置の開発　　　　　　　　　　　　　　　
森賢太; 西剛史; 太田弘道; 須佐匡裕; 遠藤理恵
第39回熱物性シンポジウム, 14 Nov. 2018

面積熱拡散時間法を用いたプラスチックの熱拡散率測定　　　　　　　　　　　　　　　
真山知大; 西剛史; 太田弘道; 神田昌枝
第39回熱物性シンポジウム, 14 Nov. 2018

Al2O3-B2O3-CaO-Na2O-SiO2融体の熱伝導率におけるTiO2, ZnO, ZrO2添加依存性　　　　　　　　　　　　　　　
大沼克也; 眞子巧巳; 大和佳史; 太田弘道; 西剛史; 柴田浩幸; 助永壮平
第39回熱物性シンポジウム, 13 Nov. 2018

フラッシュ法におけるラプラス空間解析時のラプラス変換　　　　　　　　　　　　　　　
細野和也; 西剛史; 太田弘道
第39回熱物性シンポジウム, 13 Nov. 2018

レーザスポット周期加熱放射測温法による各種標準試料の測定　　　　　　　　　　　　　　　
羽鳥仁人; 粟野孝昭; 小林千賀子; 林健; 堀江航太; 西 剛史; 大田弘道
第39回熱物性シンポジウム, 13 Nov. 2018

表面加熱・表面検出レーザフラッシュ法を用い た金属基板上酸化膜の熱容量測定装置の開発　　　　　　　　　　　　　　　
森賢太; 西剛史; 太田弘道; 須佐匡裕; 遠藤理恵
第39回日本熱物性シンポジウム, 13 Nov. 2018

Viscosities of steinless steel and boron-carbide alloy melts　　　　　　　　　　　　　　　
Tsuyoshi Nishi; Hiromichi Ohta; Hiroki Kokubo; Hidemasa Yamano
NuMat2018, 17 Oct. 2018

Development of the viscosity measurement apparatus of molten nickel and stainless steel　　　　　　　　　　　　　　　
Hiroki Kokubo; Tsuyoshi Nishi; Hiromichi Ohta; Hidemasa Yamano
NuMat2018, 15 Oct. 2018

Thermal conductivity of Na2O-B2O3-SiO2 melts　　　　　　　　　　　　　　　
Takumi Manako; Tsuyoshi Nishi; Hiromichi Ohta; Kento tanaka; Sohei Sukenaga; Hiroyuki Shibata; Toshiaki Kakihara
NuMat2018, 15 Oct. 2018

ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (10)10mass%B4C-SS共晶溶融物の粘度測定　　　　　　　　　　　　　　　
西 剛史; 太田弘道; 山野秀将
日本原子力学会2018年秋の大会, 06 Sep. 2018, 日本原子力学会

ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究,(10)10mass%B4C-SS共晶溶融物の粘度測定　　　　　　　　　　　　　　　
西 剛史、太田弘道、山野秀将
日本原子力学会2018年秋の大会, 06 Sep. 2018, 日本原子力学会

茨城大学における高温融体における熱物性測定の現状　　　　　　　　　　　　　　　
西 剛史
2018年度 日本鉄鋼協会 高温物性値フォーラム研究会, 04 Sep. 2018, 日本鉄鋼協会, [Invited]

Thermal conductivity of R2O-SiO2 and CaO-R2O-SiO2 (R=Li, Na, K) melts　　　　　　　　　　　　　　　
T. Nishi; K. Ohnuma; K. Tanaka; T. Manako; Y. Yamato; H. Ohta; S. Sukenaga; H. Shibata; T. Kakihara
PNCS-ESG 2018, 10 Jul. 2018

示差走査熱量計とX線回折装置を用いた鋳造スリーブの発熱挙動評価　　　　　　　　　　　　　　　
神戸健志郎; 西 剛史; 太田弘道; 勝又淳友; ゴォニュホアン
日本金属学会, 19 Mar. 2018, 日本金属学会

高熱伝導放熱シートの熱拡散率分布測定　　　　　　　　　　　　　　　
林 健; 西 剛史; 太田弘道; 羽鳥仁人; 野口秀則
日本金属学会, 19 Mar. 2018, 日本金属学会

レーザフラッシュ法を用いたプラスチック材料の熱拡散率測定　　　　　　　　　　　　　　　
真山知大; 西 剛史; 太田弘道; 神田昌枝
日本金属学会, 19 Mar. 2018, 日本金属学会

溶融ステンレス鋼を用いたるつぼ回転粘度測定装置の整備　　　　　　　　　　　　　　　
小久保宏紀; 太田弘道; 西 剛史; 山野秀将
日本金属学会, 19 Mar. 2018, 日本金属学会

SiO2-AlO1.5-R2O（R=Li,Na）融体状態およびガラス状態の熱伝導率　　　　　　　　　　　　　　　
眞子巧巳; 田中健登; 大沼克也; 太田弘道; 西 剛史; 助永壮平; 柴田浩幸; 柿原敏明
日本金属学会, 19 Mar. 2018, 日本金属学会

表面加熱・表面測温レーザフラッシュ法による二層試料の熱物性測定法の開発　　　　　　　　　　　　　　　
森 賢太; 西 剛史; 太田弘道; 遠藤理恵; 須佐匡裕
日本金属学会, 19 Mar. 2018, 日本金属学会

示差走査熱量計を用いた鋳造用スリーブの発熱量評価　　　　　　　　　　　　　　　
神戸健志郎; 太田弘道; 西 剛史; 勝又渟友; ゴォニュホアン
第38回日本熱物性シンポジウム, 09 Nov. 2017, 日本熱物性学会

氷熱量計を用いた鋳造用発熱スリーブの発熱量測定手法の開発　　　　　　　　　　　　　　　
勝又淳友; 神戸健志郎; ゴォニュホアン; 西 剛史; 太田弘道
第38回日本熱物性シンポジウム, 09 Nov. 2017, 日本熱物性学会

スポット周期加熱放射測温法による解析式を用いた２層材料の熱伝導率測定　　　　　　　　　　　　　　　
羽鳥仁人; 粟野孝昭; 西 剛史; 太田弘道; 五十嵐誉廣
第38回日本熱物性シンポジウム, 09 Nov. 2017, 日本熱物性学会

鋳造用発熱鋳型材の炉内加熱による発熱挙動評価　　　　　　　　　　　　　　　
ゴォニュホアン; 勝又渟友; 神戸健志郎; 西 剛史; 太田弘道
第38回日本熱物性シンポジウム, 09 Nov. 2017, 日本熱物性学会

B2O3-SiO2およびB2O3-CaO-SiO2融体の熱伝導率のB2O3含有率依存性　　　　　　　　　　　　　　　
西 剛史; 田中健登; 大沼克也; 眞子巧巳; 太田弘道; 助永壮平; 柴田浩幸; 柿原敏明
第38回日本熱物性シンポジウム, 07 Nov. 2017, 日本熱物性学会

熱物性顕微鏡を用いた鉄基合金系熱電変換材料の熱浸透率測定　　　　　　　　　　　　　　　
大川萌里; 西 剛史; 池田輝之; 太田弘道; 羽鳥仁人
第38回日本熱物性シンポジウム, 07 Nov. 2017, 日本熱物性学会

スポット周期加熱放射測温法による複合材料の熱拡散率評価および検討　　　　　　　　　　　　　　　
篠原貴洸; 太田弘道; 西 剛史; 羽鳥仁人; 野口秀則; 神田昌枝
第38回日本熱物性シンポジウム, 07 Nov. 2017, 日本熱物性学会

B2O3-Na2O-SiO2融体の熱伝導率　　　　　　　　　　　　　　　
田中健登; 大沼克也; 眞子巧巳; 太田弘道; 西 剛史; 柴田浩幸; 助永壮平; 柿原敏明
第38回日本熱物性シンポジウム, 07 Nov. 2017, 日本熱物性学会

共軸二重円筒回転粘度計を用いたSn-Ag-Cuはんだの粘度測定　　　　　　　　　　　　　　　
橋本康孝; 太田弘道; 西 剛史
第38回日本熱物性シンポジウム, 07 Nov. 2017, 日本熱物性学会

ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (1)プロジェクト全体概要　　　　　　　　　　　　　　　
山野秀将; 高井俊英; 古川智弘; 江村優軌; 倉田正輝; 東 英生; 福山博之; 西 剛史; 劉 暁星; 古谷正裕
日本原子力学会2017年秋の大会, 15 Sep. 2017, 日本原子力学会

ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (5)5mass%B4C-SS共晶溶融物の粘度測定　　　　　　　　　　　　　　　
日本原子力学会2017年秋の大会, 15 Sep. 2017, 日本原子力学会

ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究,(1)プロジェクト全体概要　　　　　　　　　　　　　　　
山野秀将; 高井俊英; 古川智弘; 江村優軌; 倉田正輝; 東 英生; 福山博之; 西 剛史; 劉 暁星; 古谷正裕
日本原子力学会2017年秋の大会, 15 Sep. 2017, 日本原子力学会

ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究,(5)5mass%B4C-SS共晶溶融物の粘度測定　　　　　　　　　　　　　　　
日本原子力学会2017年秋の大会, 15 Sep. 2017, 日本原子力学会

溶融Sn-Ag-Cu はんだの粘性率- 温度・Ag 添加量依存性の検討　　　　　　　　　　　　　　　
橋本康孝; 太田弘道; 西 剛史
日本金属学会2017年秋期(第161回)講演大会, 07 Sep. 2017, 日本金属学会

THERMAL DIFFUSIVITY MEASUREMENT FOR METALIC AND OXIDE GLASSES USING A LASER FLASH METHOD　　　　　　　　　　　　　　　
H. Shibata; S. Sukenaga; T. Nishi; H. Ohta
European Conference on Thermophysical Properties,21st 2017, 03 Sep. 2017

多元系硼珪酸塩融体の熱伝導率　　　　　　　　　　　　　　　
田中健登; 太田弘道; 西 剛史; 大沼克也; 助永壮平; 柴田浩幸
日本鉄鋼協会第173回春季講演大会シンポジウム, 16 Mar. 2017, 日本鉄鋼協会

DSCを用いた鋳造用スリーブの発熱量評価　　　　　　　　　　　　　　　
西 剛史; 大場康太郎; 菱沼洋平; 太田弘道
日本金属学会2017年秋期（第160回）講演大会, 15 Mar. 2017, 東京

電子デバイス用放熱用ＴＩＭシートの熱拡散率分布測定　　　　　　　　　　　　　　　
笹川大揮; 西 剛史; 太田弘道; 篠原貴洸; 羽鳥仁人
日本金属学会2017年春期(第160回)講演大会, 15 Mar. 2017, 日本金属学会

二元系硼珪酸塩融体の熱伝導率の組成依存性の検討　　　　　　　　　　　　　　　
大沼克也; 太田弘道; 西 剛史; 田中健登; 柴田浩幸; 助永壮平; 柿原敏明; 川島英典; 内山 翠
日本金属学会2017年春期(第160回)講演大会, 15 Mar. 2017, 日本金属学会

鋳造用発熱スリーブの発熱量測定手法の開発　　　　　　　　　　　　　　　
勝又淳友; 太田弘道; 西 剛史
日本金属学会2017年春期(第160回)講演大会, 15 Mar. 2017, 日本金属学会

サーモウェブアナライザを用いた複合材料の熱拡散率異方性に関する検討　　　　　　　　　　　　　　　
篠原貴洸; 太田弘道; 西 剛史; 羽鳥仁人; 野口秀則; 粟野孝昭; 神田昌枝; 西 義武
第37回日本熱物性シンポジウム, 30 Nov. 2016

冷やし金の熱拡散率とスリーブ材発量測定　　　　　　　　　　　　　　　
菱沼洋平; 田中健登; 西 剛史; 太田弘道
第37回日本熱物性シンポジウム, 28 Nov. 2016

熱物性顕微鏡を用いた界面抵抗測定のアプローチ　　　　　　　　　　　　　　　
大川萌里; 西 剛史; 太田弘道; 羽鳥仁人
第37回日本熱物性シンポジウム, 28 Nov. 2016

熱物性顕微鏡を用いたPb30Sb10Ag10Te50熱電材料の局所熱浸透率測定　　　　　　　　　　　　　　　
西 剛史; 池田 輝之; 太田 弘道; 山本 俊; 大川 萌里; 羽鳥 仁人
日本金属学会2016年秋期講演大会, 22 Sep. 2016

溶融Sn-Ag-Cu合金の粘度測定システムの開発　　　　　　　　　　　　　　　
日本金属学会2016年秋期講演大会, 21 Sep. 2016

鋳鉄用冷やし金の熱拡散率分布測定　　　　　　　　　　　　　　　
田中 健登; 菱沼 洋平; 太田 弘道; 西 剛史
日本金属学会2016年秋期講演大会, 21 Sep. 2016

THERMAL CONDUCTIVITY OF BOROSILICATE MELT　　　　　　　　　　　　　　　
Molten 2016, 24 May 2016

B2O3-CaO-SiO2融体の熱伝導率　　　　　　　　　　　　　　　
小嶋純平; 西 剛史; 太田 弘道; 助永 壮平; 柴田 浩幸; 川島 英典; 柿原 敏明
日本原子力学会2016年春の年会, 28 Mar. 2016, 日本原子力学会

熱物性顕微鏡を用いた複合材料界面の熱抵抗測定　　　　　　　　　　　　　　　
大川萌里; 山本 俊; 西 剛史; 太田弘道; 羽鳥仁人
日本金属学会2016年春期講演大会, 23 Mar. 2016, 日本金属学会

サーモウエーブアナライザを用いた複合材料の熱拡散率測定　　　　　　　　　　　　　　　
篠原貴洸; 太田弘道; 西 剛史; 羽鳥仁人; 野口秀則; 粟野孝昭; 神田昌枝; 西 義武
日本金属学会2016年春期講演大会, 23 Mar. 2016, 日本金属学会

鉛フリーはんだの粘性測定システムの開発　　　　　　　　　　　　　　　
橋本康孝; 太田弘道; 西 剛史
日本金属学会2016年春期講演大会, 23 Mar. 2016, 日本金属学会

高温におけるアクチノイド化合物の熱物性測定　　　　　　　　　　　　　　　
西 剛史; 太田弘道
H27年度第2回 日本鉄鋼協会高温物性値フォーラム・ 日本熱物性学会研究分科会「高温融体物性と材料プロセス」研究会, 15 Dec. 2015, 日本鉄鋼協会、日本熱物性学会

熱物性顕微鏡を用いたハイスループットな手法への挑戦　　　　　　　　　　　　　　　
西 剛史; 山本 俊; 大川萌里; 太田弘道
日本機械学会第7回マイクロ・ナノ工学シンポジウム, 30 Oct. 2015, 日本機械学会

熱物性顕微鏡によるコンビナトリアル熱電変換材料の熱浸透率測定　　　　　　　　　　　　　　　
山本 俊; 大川萌里; 西 剛史; 池田輝之; 太田弘道; 羽鳥仁人
第36回日本熱物性シンポジウム, 21 Oct. 2015, 日本熱物性学会

局所周期加熱法による熱拡散率測定における熱損失の影響評価　　　　　　　　　　　　　　　
佐藤優友; 太田弘道; 西 剛史; 粟野孝昭; 野口秀則; 羽鳥仁人
第36回日本熱物性シンポジウム, 21 Oct. 2015, 日本熱物性学会

溶融SUS316の垂直分光放射率、熱容量、熱伝導率測定　　　　　　　　　　　　　　　
東 英生; 福山博之; 西 剛史; 山野秀将
第36回日本熱物性シンポジウム, 19 Oct. 2015, 日本熱物性学会

硼珪酸塩融体の熱伝導率　　　　　　　　　　　　　　　
小嶋純平; 黒田佳孝; 西 剛史; 助永 壮平; 柴田 浩幸; 太田 弘道
第36回日本熱物性シンポジウム, 19 Oct. 2015, 日本熱物性学会

周期加熱放射測温法による熱拡散率分布測定法の開発　　　　　　　　　　　　　　　
羽鳥仁人; 粟野孝昭; 野口秀則; 篠原貴洸; 西 剛史; 太田弘道
第36回日本熱物性シンポジウム, 19 Oct. 2015, 日本熱物性学会

物性予測を目指したアクチノイド酸化物のXAFS研究　　　　　　　　　　　　　　　
西 剛史
日本鉄鋼協会ミニシンポジウム（材料のX線・電子線を用いた状態評価と特性の研究）, 03 Aug. 2015

Thermal conductivity of U-20wt.%Pu-2wt.%Am-10wt.%Zr alloy　　　　　　　　　　　　　　　
T. Nishi; K. Nakajima; M. Takano; M. Kurata; Y. Arita
Nuclear Materials 2014 (NuMat2014), 2014, Elsevier

Development of TRU nitride database for designing ADS fuel　　　　　　　　　　　　　　　
T. Nishi; Y. Arai; M. Takano; H. Hayashi; M. Kurata
International Symposium on Nuclear Back-end Issues and the Role of Nuclear Transmutation Technology after the accident of TEPCO's Fukushima Daiichi Nuclear Power Stations, 2013

Thermal conductivity of (Np0.20Pu0.50Am0.25Cm0.05)O2-x solid solutions　　　　　　　　　　　　　　　
T. Nishi; M. Takano; M. Akabori; Y. Arai
Nuclear Materials 2012 (NuMat2012), 2012, Elsevier

XAFS study on americium dioxide, americium sesquioxide and uranium-americium mixed oxide solid solution　　　　　　　　　　　　　　　
T. Nishi; M. Nakada; C. Suzuki; H. Shibata; Y. Okamoto; M. Akabori; M. Hirata
6th Workshop on Speciation, Techniques, and Facilities for Radioactive Materials at Synchrotron Light Sources and Other Quantum Beam Sources (Actinide XAS 2011), 2011

Thermal Conductivities of (ZrxPu(1-x)/2Am(1-x)/2)N Solid Solutions　　　　　　　　　　　　　　　
T. Nishi; M. Takano; M. Akabori; Y. Arai
International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011), 2011

Heat capacities and thermal conductivities of AmO1.5 and AmO2　　　　　　　　　　　　　　　
T. Nishi; A. Itoh; K. Ichise; Y. Arai
Nuclear Materials 2010 (NuMat2010), 2010, Elsevier

Thermal conductivities of (Np,Am)N and (Pu,Am)N solid solutions　　　　　　　　　　　　　　　
Actinide 2009, 2009

Thermal conductivities of transuranium nitride solid solutions　　　　　　　　　　　　　　　
T. Nishi; M. Takano; A. Itoh; M. Akabori; Y. Arai; K. Minato
IP-EUROTRANS International Training Course (ITC-9) on Accelerator-driven Transmutation System for European and Asian Young Scientists and Engineers, 2009

Thermal conductivities of neptunium and americium mononitrides　　　　　　　　　　　　　　　
10th OECD /NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation, 2008

Thermal conductivities of minor actinide oxides for advanced fuel　　　　　　　　　　　　　　　
3rd International ATALANTE Conference (ATALANTE 2008), 2008

XAFS study of americium dioxide　　　　　　　　　　　　　　　
Materials Models and Simulations for Nuclear Fuels (MMSNF-6), 2007

Apr. 2024 - Present

Apr. 2023 - Present

2023 - Present

Apr. 2021 - Present

Apr. 2021 - Present
茨城大学工学部物質科学工学科

Apr. 2019 - Present

2019 - Present
茨城大学工学部物質科学工学科

2018 - Present
茨城大学工学部

2016 - Present
茨城大学大学院理工学研究科量子線科学専攻

2016 - Present
茨城大学工学部

2016 - 2020
茨城大学工学部マテリアル工学科

2019 - 2019
茨城大学工学部マテリアル工学科

2016 - 2019
茨城大学工学部マテリアル工学科

2017 - 2017
茨城大学工学部マテリアル工学科

2016 - 2017
茨城大学大学院理工学研究科量子線科学専攻

2018, 日本実験力学会

2018, 日本鉄鋼協会

2013, Japan Society of Thermophysical Properties

2004, Atomic Energy Society of Japan

1999, The Japan Institute of Metals and Materials

Evaluation of thermal conductivity of U-Zr-O melt by cyclic heating method using gas levitation method
Grant-in-Aid for Scientific Research (B)
Osaka University
Apr. 2024 - Mar. 2027

酸化スケールの熱伝導率決定のため固体用表面加熱・表面検出レーザフラッシュ装置の開発　　　　　　　　　　　　　　　
Oct. 2023 - Mar. 2027

改良原料ガラスの熱物性測定　　　　　　　　　　　　　　　
Sep. 2023 - Mar. 2025

放射性廃棄物固化用ガラスの熱物性測定の高精度化－熱物性予測システム構築を目指して　　　　　　　　　　　　　　　
科学研究費助成事業：基盤研究（B）
Apr. 2021 - Mar. 2025

溶融Snの粘度測定に関する指導　　　　　　　　　　　　　　　
Oct. 2023 - Sep. 2024

異材界面における熱物性測定　　　　　　　　　　　　　　　
Apr. 2023 - Mar. 2024

粘度測定装置の新規開発　　　　　　　　　　　　　　　
Feb. 2023 - Mar. 2024

光学ガラスの熱伝導率測定　　　　　　　　　　　　　　　
Sep. 2023 - Feb. 2024

溶融塩炉設計検討のための多元系塩化物物性値に関する研究　　　　　　　　　　　　　　　
Jun. 2023 - Jan. 2024

溶融ステンレス鋼－B4Cの粘度に関する研究　　　　　　　　　　　　　　　
Jun. 2023 - Jan. 2024

改良減量ガラス熱物性測定　　　　　　　　　　　　　　　
Apr. 2022 - Mar. 2023

溶融酸化物の熱伝導度計測高度化に関する研究　　　　　　　　　　　　　　　
Apr. 2022 - Mar. 2023

異材界面における熱浸透率の整合性に関する共同研究　　　　　　　　　　　　　　　
Apr. 2022 - Mar. 2023

粘度測定装置の新規開発に関する指導　　　　　　　　　　　　　　　
Feb. 2022 - Jan. 2023

溶融塩炉設計検討のための塩化鉛物性値に関する研究　　　　　　　　　　　　　　　
Jun. 2021 - Jan. 2023

改良原料ガラスの熱浸透率測定(2021年度)　　　　　　　　　　　　　　　
Jun. 2021 - Mar. 2022

科学技術ｲﾉﾍﾞｰｼｮﾝ創出に向けた大学ﾌｫﾛｰｼｯﾌﾟ創備事業　　　　　　　　　　　　　　　
Apr. 2021 - Mar. 2022

急速加熱条件に対応した簡易断熱型熱量計の開発　　　　　　　　　　　　　　　
Sep. 2021 - Feb. 2022

高温融体物性測定技術に関する基礎研究　　　　　　　　　　　　　　　
Apr. 2021 - Jan. 2022

安定生産プロセスを目指した鉛フリーはんだの材料設計システムの構築　　　　　　　　　　　　　　　
01 Apr. 2016 - 31 Mar. 2020

安定生産プロセスを目指した鉛フリーはんだの材料設計システムの構築　　　　　　　　　　　　　　　
Apr. 2016 - Mar. 2019

鉛フリーはんだの大量生産に向けた共軸二重円筒回転粘度計による粘度測定に関する研究　　　　　　　　　　　　　　　
科学研究費助成事業：基盤研究（C）
Apr. 2016 - Mar. 2019

金属融体および酸化物融体の熱物性測定に対する研究助成　　　　　　　　　　　　　　　
Mar. 2019 - Mar. 2023

鋳造シミュレーションに資する物性データ取得による技術者の人材育成　　　　　　　　　　　　　　　
Aug. 2015 - Mar. 2016

「ヘリウムガスが供給不足 県内でも影響」　　　　　　　　　　　　　　
appearance
NHK, いば６、茨城ニュース８４５, 01 Apr. 2022