巻号一覧
45 巻 (2018)
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45 巻, 1 号
選択された号の論文の8件中1～8を表示しています
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巻頭言
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齋藤 一弥2018 年 45 巻 1 号 p. 1
発行日: 2018/01/30
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (595K)
論文
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河口 宗道, 宮原 信哉, 宇埜 正美2018 年 45 巻 1 号 p. 2-8
発行日: 2018/01/25
公開日: 2022/11/20
ジャーナル フリーSodium (Na) has been used as the coolant of fast reactors for the various merits. On the other hand, it is postulated that steel liner may fail and lead to sodium-concrete reaction (SCR) during the Na-leak accident. Because of release of hydrogen gas due to the chemical reactions between Na and concrete components, SCR is one of the important phenomena in the Na-leak accident.
In this study, fundamental experiments related to SCR were performed using Na and concrete powder. The used concrete powder is milled siliceous concrete which is used as the structural concrete in Japanese nuclear power plants. The obvious temperature changes around 100, 300 and 500 ºC were observed for Na-melt, NaOH-SiO2 and Na-H2O-SiO2 reaction, respectively. Especially, the violent reaction around 500 ºC caused the temperature peak to 836∼853 ºC, and the reaction heat of 0.15 ∼ 0.23 kW g-1 was estimated under the Na-concrete mixing ratio such as Na concentration, γ ≈ 0.32.
After the experiments, main components and thermophysical properties of the reaction products were measured. The main component was identified as Na2SiO3 with X-ray diffraction technique. The measured thermophysical properties of melting point, density, specific heat, thermal conductivity and viscosity were similar to those of xNa2O-(1−x)SiO2 (x ≤ 0.5).抄録全体を表示PDF形式でダウンロード (1736K)
2017年度日本熱測定学会学会賞
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森川 淳子2018 年 45 巻 1 号 p. 9-15
発行日: 2018/01/25
公開日: 2022/11/20
ジャーナル フリーThe thermal diffusivity, thermal effusivity, and thermal conductivity are the heat transport properties responsible for the thermal management in major technological developments. Understanding and controlling the thermal properties of materials provides opportunities to radiate, insulate, store, and transform the heat efficiently. Here I review the basic principles and the development of temperature wave analysis and thermal imaging methods in thermal analysis that make use of thermally modulated stimulation to be detected by the contact and the non-contact temperature sensors in accordance with the linear response theory. The anisotropic heat transfer properties in liquid crystals, phase change materials, femtosecond-laser fabricated polymer films, and bio-materials are presented in the multi-dimensional approaches with the developed techniques. It is demonstrated that the molecular model is valid for the qualitative prediction of the effect of the molecular length on the magnitude of the thermal conductivity of liquid crystals. More recent topics on the development of the thermo-spectroscopy is presented with the thermal and the spectroscopic imaging of phase transition of n-alkane and the radical polymerization of styrene in microfluidics.
Advances in such measuring techniques provide the accurate data of thermal properties to be linked to the materials informatics and the information technology that will become more important in the future industry.抄録全体を表示PDF形式でダウンロード (2041K)
特集－ナノ構造体－
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小林 研介2018 年 45 巻 1 号 p. 16-22
発行日: 2018/01/25
公開日: 2022/11/20
ジャーナル フリーIn this review, we describe what we can learn from noise in mesoscopic systems. We first introduce noise in electric circuits. Historical importance of noise (or equivalently fluctuation) is stressed especially in terms of the study on the Brownian motion and the fluctuation-dissipation relations. Second we introduce mesoscopic systems, which are very small, typically micrometer- or nanometer- sized, electric circuits made of metals or semiconductors by using nanofabrication technique. The biggest advantage of studying them lies in the fact that we can conduct precise experiments in a scale where quantum physics plays a key role. Finally, we discuss two examples of our noise research in mesoscopic systems, namely the experimental test of the fluctuation theorem and the shot noise in a strongly-correlated system. Our attempts will shed new light on the research field of mesoscopic quantum statistical physics and non-equilibrium quantum many-body physics.抄録全体を表示PDF形式でダウンロード (1047K) -
筒井 真楠, 村山 さなえ, 森川 高典, 横田 一道, 谷口 正輝2018 年 45 巻 1 号 p. 23-27
発行日: 2018/01/25
公開日: 2022/11/20
ジャーナル フリーSingle-molecule connected to two electrodes comprises a nanostructure with quantum transport properties promising for thermoelectric applications. Here we describe a nanosensor strategy for measuring thermoelectric transport in single-molecule junctions. Our device consists of a Au nanobridge and a microheater embedded at the micrometer vicinity on a bending beam. It can be used to create molecular junctions via a mechanically-controllable break junction (MCBJ) technique and also to impose a temperature difference at a molecule by electrical heating the heater. In this way, whereby enabling thermoelectric voltage measurements at the single-molecule level. We also discuss the future prospects for thermal conductance measurements of single-molecule junctions.抄録全体を表示PDF形式でダウンロード (1495K) -
川路 均, 気谷 卓2018 年 45 巻 1 号 p. 28-34
発行日: 2018/01/25
公開日: 2022/11/20
ジャーナル フリーMetal-Organic Frameworks (MOF) are the materials that have a three-dimensionally connected and ordered pore structure constructed by the self-organization of the metal ions and cross-linked organic ligands, and a large amount of various gases and organic molecules can be adsorbed in the crystal structure. The studies of gas storage properties of MOF have been researched actively. However, the physical properties of the guest molecules adsorbed in the micropores are not yet resolved. In this paper, the phase transition properties of some organic substances absorbed in IRMOF-1 was reviewed. The heat capacity measurements and X-ray diffraction studies for benzene absorbed IRMOF-1 are described. The results of DSC measurements carried out on the various organic molecules absorbed in IRMOF-1 (dichloromethane, chloroform, carbon tetrachloride, benzene, cyclohexane, chlorobenzene, toluene, n-hexane) with changing the amount of absorbed molecules are also discussed. The melting was observed at a temperature different from the melting point of the bulk. In the case of most organic molecules (dichloromethane, chloroform, benzene, chlorobenzene, toluene, n-hexane), the phase transition was observed at the lower temperature of the bulk melting point. On the other hand, the melting temperature was observed at the higher temperature of the bulk melting point for carbon tetrachloride and cyclohexane. The phase transition mechanism of the substances absorbed in the micropores of HKUST-1 are discussed.抄録全体を表示PDF形式でダウンロード (1722K)
フロギストン
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2018 年 45 巻 1 号 p. 35-36
発行日: 2018/01/25
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (616K)
熱測定応用研究のページ
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細井 宜伸2018 年 45 巻 1 号 p. 37-38
発行日: 2018/01/25
公開日: 2022/11/20
ジャーナル フリーPDF形式でダウンロード (877K)
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