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Fast and reversible hydrogen storage in channel cages of hydroquinone clathrate
Han, K.W.,Lee, Y.J.,Jang, J.S.,Jeon, T.I.,Park, J.,Kawamura, T.,Yamamoto, Y.,Sugahara, T.,Vogt, T.,Lee, J.W.,Lee, Y.,Yoon, J.H. North Holland ; Elsevier Science Ltd 2012 Chemical physics letters Vol.546 No.-
Guest-free hydroquinone (HQ) clathrate was synthesized by the gas-phase reaction between host HQ and guest CO<SUB>2</SUB> molecules, followed by removal of the CO<SUB>2</SUB> guests by controlled heating process. The H<SUB>2</SUB> storage capacity of the guest-free HQ clathrate is highly sensitive to the loading pressure; at 298K, it was found to be 0.19 wt.% at 10MPa and 0.38 wt.% at 35MPa. In particular, the guest-free HQ clathrate also exhibits an extremely fast uptake and release of H<SUB>2</SUB> in a time scale of a few seconds.
Radwaste management aspects of the test blanket systems in ITER
van der Laan, J.G.,Canas, D.,Chaudhari, V.,Iseli, M.,Kawamura, Y.,Lee, D.W.,Petit, P.,Pitcher, C.S.,Torcy, D.,Ugolini, D.,Zhang, H. North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.109 No.1
Test Blanket Systems (TBS) will be operated in ITER in order to prepare the next steps towards fusion power generation. After the initial operation in H/He plasmas, the introduction of D and T in ITER will mark the transition to nuclear operation. The significant fusion neutron production will give rise to nuclear heating and tritium breeding in the in-vessel part of the TBS. The management of the activated and tritiated structures of the TBS from operation in ITER is described. The TBS specific features like tritium breeding and power conversion at elevated temperatures, and the use of novel materials require a dedicated approach, which could be different to that needed for the other ITER equipment.
Bui, N.T.,Kawamura, A.,Kim, K.W.,Prathumratana, L.,Kim, T.H.,Yoon, S.H.,Jang, M.,Amaguchi, H.,Bui, D.D.,Truong, N.T. Butterworth Scientific, [etc.] 2017 Resources policy Vol.52 No.-
The mining sector faces some of the most difficult sustainability challenges of any industrial sector. The mining sector is remarkably significant to the development of the Asia-Pacific Economic Cooperation (APEC) region, because the majority of global trade and investment in this region depends on this sector. Therefore, the assessment of mining sector sustainability at national and global scales in APEC economies is an important task. So far, however, mining sector sustainability assessment frameworks have only been developed at small scales, such as companies and cities. In this study, therefore, it is proposed an indicator-based sustainability assessment framework (iSAF) to assess mining sector sustainability at national and global scales. In this framework, fuzzy logic was utilized to adequately deal with the uncertainty and vagueness of human expressions. The conventional fuzzy scales were suitably modified in the proposed framework to facilitate confident decision-making by the relevant stakeholders. In order to avoid repeatedly conducting the judgment until the acceptable consistency was obtained, iSAF implemented an innovative theory to deal with unacceptable consistencies in judgment. The proposed iSAF was applied to the mining sector of APEC economies using data from the APEC 2010 Project. As for the results, three important criteria including economic, environmental, and social criteria and twenty significant indicators were appropriately selected to cover the actual situation in the sector. The results showed that iSAF was a suitable framework for preventing uncertainty and vagueness in decision-making. iSAF was found to provide crucial support to decision-makers, not only in identifying and structuring the main components contributing to sustainability, but also in pointing out the factors in which significant investment should be made to effectively improve sustainability.
H. Obara,M. Katayama,A. Kawamura,J. Xu,N. Shimosato,S. Inoue 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
DC power supplies for a battery testing are becoming significantly important for developments of electrical vehicles (EVs), mobile devices, and renewable energy generations. In the recent decade, modular multi-level converters (MMC) have been actively studied and started to use on some practical applications such as high- or mediumvoltage DC-AC or AC-DC power converters. However, the widely used MMC topology has a significant issue to extend to a DC-DC converter, because it cannot achieve capacitor voltage balancing of each cell unlike the case of the DC-AC and AC-DC conversions. Therefore, most of the MMC-based DC-DC converters are realized by combining the DC-AC converter, isolation transformer or inductor, and AC-DC converter. In this study, the DC-DC operation in the MMC and its problem are analyzed and clarified. This paper proposes a circuit topology and control method of the MMCbased DC-DC converter with cell voltage balancing and fast dynamic response while the DC-AC and AC-DC converters are not used. Simulation results verify the validity of the capacitor voltage balancing control. Finally, an experimental result in a prototype converter with 6-cells using SiCMOSFETs shows the performances of the voltage balancing control and fast dynamic response.
Displacive Character of the Cubic-Tetragonal Transition in CH$_3$NH$_3$PbX$_3$
H. Mashiyama,E. Magome,Y. Kawamura,Y. Kubota 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
The cubic-tetragonal phase transition in CH3NH3PbBr3 is investigated from the detailed structural analysis. The powder diraction proles, obtained with using a Debye-Scherrer camera installed at SPring-8, are analyzed by a Rietveld pattern tting program. The lattice parameters change as if a second order transition takes place, with accompanying superlattice re ections. In the cubic phase, the structure could be rened either by the displacive model or by the orderdisorder model. But the latter model is not fully consistent throughout the transition. The former model gives the rotating angle of the PbBr6 octhedron, which increases monotonically with decreasing temperature. The angle is considered to be an order parameter, and the displacive character of the phase transition is concluded in CH3NH3PbBr3 and CH3NH3PbI3.