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Surface manipulation of a triple-conducting cathode for protonic ceramic fuel cells to enhance oxygen reduction activity and CO_(2) tolerance

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Journal of Energy Chemistry 2023年第12期87卷 450-459,I0012页

作者： Wenwen Zhang Hiroki Muroyama Yuichi Mikami toshiaki Matsui Koichi Eguchi Department of Energy and Hydrocarbon Chemistry Graduate School of EngineeringKyoto UniversityNishikyo-kuKyoto 615-8510Japan Technology Division Panasonic Holdings Corporation3-1-1 Yagumo-naka-machiMoriguchi CityOsaka 570-8501Japan

One of the main obstacles limiting the performance of protonic ceramic fuel cells(PCFCs) is the sluggish kinetics of the oxygen reduction reaction(ORR) at reduced ***,the surface manipulation of a triple-conducting cathode BaCe_(0.5)Pr_(0.3)Y_(0.2)O_(3-δ)(BCPY) by an efficient catalyst coating PrNi_(0.5)Co_(0.5)O_(3-δ)(PNC) to enhance the ORR activity and CO_(2) tolerance is *** developed PNC-coated BCPY cathode achieves the polarization resistance of 0.25 and 1.00 Ω cm^(2) at 600 and 500 ℃,respectively,approximately 1/5 of that for the pristine BCPY cathode(0.99 and 4.79 Ω cm^(2)),while maintaining an excellent CO_(2) *** single cell on a BaZr_(0.8)Yb_(0.2)O_(3-δ) electrolyte also exhibits a high peak power density of 0.79 W cm^(-2)at 700 ℃ and a stable operation for 200 h at 600 ℃.Such high ORR activity is mainly attributed to the synergistic effect of BCPY support and PNC ***,BCPY provides a tripleconducting path(mainly protons),and PNC nanoparticles facilitates surface oxygen exchange and steam adsorption/desorption processes due to the enriched surface oxygen *** study will provide a new design strategy for developing high-performance PCFCs cathode.

关键词： Triple-conducting cathode Surface manipulation Oxygen reduction reaction CO_(2)tolerance Protonic ceramicfuel cells

Study of Spiral Flow Generated through an Annular Slit

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Journal of Thermal Science 2005年第2期14卷 97-102页

作者： Tae Hun KIM Shigeru MATSUO toshiaki SETOGUCHI Heuy-Dong KIM Graduate school of Science and Technology Saga University 1Honjo-machiSaga shiSaga 840-8502JapanDepartment of Mechanical Engineering Saga University1Honjo-machiSaga shiSaga 840-8502JapanDepartment of Mechanical Engineering Saga University1Honjo-machiSaga shiSaga 840-8502JapanSchool of Mechanical Engineering College of Natural ScienceAndong National University388Song Cheon DongAndongKyung PookKorea

The effect of pressurized air inlets in the reservoir upstream of the annular slit on characteristics of the axial and tangential velocity components is investigated numerically, and the mechanism of occurrence of spiral nozzle flow is clarified. In simulations, Unified Platform for Aerospace Computational Simulation (UPACS) is used. The governing equations under consideration are the unsteady compressible Navier - Stokes. A second-order finite volume scheme with MUSCL (Roe scheme) is used to discretize the spatial derivatives, and a second order-central difference scheme for the viscous terms, and a MFGS (Matrix Free Gauss Seidel) is employed for time integration. Spalart-Allmaras model was used as a turbulence model. The results obtained are compared with velocity distributions in the experiment measured by the two-component fiber optic laser Doppler velocimeter system. The existence of discrete pressurized air inlets that leads to the occurrence of asymmetrical characteristics is a very important factor for the formation of spiral flow.

关键词： spiral nozzle flow Coanda effect convergent nozzle annular slit simulation.

Unsteady Operation of New Type Turbofan Engine with Aerodynamic Torque Converter Reducing Front Fan Speed

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Journal of Thermal Science 2005年第3期14卷 206-210页

作者： toshiaki KANEMOTO Seita SEKI Kazunori IDENO Ahmed Mohamed GALAL Kyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 Japan ProfessorKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 JapanKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 JapanKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 Japan

It is desired to increase the rotational speed of the core engine of the turbofan so as to get the best efficiency for the next leap of engine technology. The conventional mechanism in which the front fan is directly connected to the output shaft of a core engine, have a limit of increasing the spool speed, because the fan diameter is very large. The authors have proposed a new driving system in which the front fan is driven through the aerodynamic torque converter. The front fan can work at the best performance at slower speed while the core engine runs more efficiently at higher speed. Continuously, this paper discusses the response of the front fan in the unsteady operation of the core engine, accompanying with the internal flow. The system has the acceptable responsibility in the unsteady operation which is very important for the aircrafts.

关键词： turbofan engine front fan torque converter rotational speed

Petrology,geochemistry,and zircon U-Pb geochronology of the Zambezi Belt in Zimbabwe:Implications for terrane assembly in southern Africa

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Geoscience Frontiers 2019年第6期10卷 2021-2044页

作者： Yusuke Kuribara toshiaki Tsunogae Yusuke Takamura Yukiyasu Tsutsumi Graduate School of Life and Environmental Sciences University of TsukubaIbaraki 305-8572Japan Department of Geology University of JohannesburgAuckland Park 2006South Africa Department of Geology and Paleontology National Museum of Nature and ScienceIbaraki 305-0005Japan

The Zambezi Belt in southern Africa has been regarded as a part of the 570-530 Ma Kuunga Orogen formed by a series of collision of Archean cratons and Proterozoic orogenic ***,we report new petrological,geochemical,and zircon U-Pb geochronological data of various metamorphic rocks(felsic to mafic orthogneiss,pelitic schist,and felsic paragneiss)from the Zambezi Belt in northeastern Zimbabwe,and evaluate the timing and P-T conditions of the collisional event as well as protolith *** data of felsic orthogneiss indicate within-plate granite signature,whereas those of mafic orthogneiss suggest MORB,ocean-island,or within-plate *** P-Testimates for orthogneisses indicate significant P-T variation within the study area(700-780 C/6.7-7.2 kbar to 800-875 C/10-11 kbar)suggesting that the Zambezi Belt might correspond to a suture zone with several discrete crustal *** cores from felsic orthogneisses yielded two magmatic ages:2655±21 Ma and 813士5 Ma,which suggests Neoarchean and Early Neoproterozoic crustal growth related to within-plate *** zircons from metasediments display various ages from Neoarchean to Neoproterozoic(ca.2700-750 Ma).The Neoarchean(ca.2700-2630 Ma)and Paleoproterozoic(ca.2200-1700 Ma)zircons could have been derived from the adjacent Kalahari Craton and the Magondi Belt in Zimbabwe,*** Choma-Kalomo Block and the Lufilian Belt in Zambia might be proximal sources of the Meso-to Neoproterozoic(ca.1500-950 Ma)and early Neoproterozoic(ca.900-750 Ma)detrital zircons,*** detrital zircons from adjacent terranes possibly deposited during late Neoproterozoic(744-670 Ma),and subsequently underwent highgrade metamorphism at 557-555 Ma possibly related to the collision of the Congo and Kalahari Cratons during the latest Neoproterozoic to *** contrast,670-627 Ma metamorphic ages obtained from metasediments are slightly older than previous reports,but consistent with^68

关键词： Geothermobarometry Detrital zircon Neoproterozoic Congo Craton Kalahari Craton Gondwana

Effect of Rotational Speed on the Stability of Two Rotating Side-by-side Circular Cylinders at Low Reynolds Number

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Journal of Thermal Science 2018年第2期27卷 125-134页

作者： DOU Huashu ZHANG Shuo YANG Hui SETOGUCHI toshiaki KINOUE Yoichi Key Laboratory of Fluid Transmission Technology of Zhejiang Province Zhejiang Sci-Tech University Department of Mechanical Engineering Saga University

Flow around two rotating side-by-side circular cylinders of equal diameter D is numerically studied at the Rey- nolds number 40〈 Re 〈200 and various rotation rate 8i. The incoming flow is assumed to be two-dimensional laminar flow. The governing equations are the incompressible Navier-Stokes equations and solved by the finite volume method （FVM）. The ratio of the center-to-center spacing to the cylinder diameter is T/D=2. The objective of the present work is to investigate the effect of rotational speed and Reynolds number on the stability of the flow. The simulation results are compared with the experimental data and a good agreement is achieved. The stability of the flow is analyzed by using the energy gradient theory, which produces the energy gradient function K to identify the region where the flow is the most prone to be destabilized and the degree of the destabilization. Numerical results reveal that K is the most significant at the separated shear layers of the cylinder pair. With Re in- creases, the length of the wake is shorter and the vortex shedding generally exhibits a symmetrical distribution for θi〈θcrit. It is also shown that the unsteady vortex shedding can be suppressed by rotating the cylinders in the counter-rotating mode.

关键词： numerical simulation rotating circular cylinders stability vortex interactions energy gradient theory

Pharmacogenetics of irinotecan:An ethnicity-based prediction of irinotecan adverse events

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World Journal of Gastrointestinal Surgery 2010年第1期2卷 14-21页

作者： Shouji shimoyama Gastrointestinal Unit Settlement Clinic4-20-7TowaAdachi-kuTokyo 120-0003Japan

Irinotecan is now regarded as the most active drug for the treatment of colorectal ***,one of the most difficult issues oncologists face is deciding the optimal dose for an individual patient,as each individual shows different outcomes even at the same dose with regard to treatment related adverse events,ranging from no toxicity to a lethal *** genetic polymorphism of a single gene or multiple genes(haplotype or linkage disequilibrium) involved in SN-38 glucuronidation,a predominant route of irinotecan detoxification,is now recognized as a significant factor that can alter the incidence of side *** to explore such inherited genetic variability have been focused on elucidating interindividual as well as interethnic *** studies in relation to adverse events in an individual or in a group of similar ethnicity should contribute to establishing individualoriented or ethnicity-oriented irinotecan treatment *** review highlights current single-or multi-tired approaches for the elucidation of genetic predispositions of patients to severe toxicities,especially among *** purpose of this is to contribute to minimizing toxicity by dose modifications,with the consequent aim of maximizing dose intensity and efficacy,an ultimate goal of irinotecan-individualized therapy.

关键词： Irinotecan Pharmacogenetics Polymorphism Ethnicity Colorectal cancer Chemotherapy Adverse events Uridine diphosphate glucuronosyltransferase

Passive Control of Condensation Shock Wave in Prandtl-Meyer Expansion Flow

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Journal of Thermal Science 2003年第1期12卷 20-26页

作者： Shigeru Matsuo Masanori Tanaka toshiaki Setoguchi Heuy-Dong Kim Department of Mechanical Engineering Saga UniversityDepartment of Mechanical Engineering Saga UniversityDepartment of Mechanical Engineering Saga UniversitySchool of Mechanical Engineering College of Natural Science Andong National University 388 1 Honjo-machi Saga-shi Saga 840-8502 Japan1 Honjo-machi Saga-shi Saga 840-8502 Japan 1 Honjo-machi Saga-shi Saga 840-8502 Japan Song-Cheon Dong Andong Kyung-Pook Korea

In this paper, the effects of the passive technique by using the slotted wall on the characteristics of a condensation shock wave generated in a Prandtl-Meyer flow were investigated experimentally. Furthermore, in order to clarify the variation of condensation properties in the flow field, Navier-Stokes equations were solved numerically using a 3rd-order MUSCL type TVD finite-difference scheme with a second-order fractional-step for time integration. Baldwin-Lomax model was used as a turbulence model in the computations. From experimental results, it was found that the shock strength on the slotted wall became weak in comparison with no passive case (solid wall), and the present passive technique was the most effective when a foot of the condensation shock wave was located at the middle of slotted wall. Furthermore, it was confirmed numerically that the passive technique was also effective for the unsteady condensation shock wave.

关键词： compressible flow Prandtl-Meyer flow condensation shock wave numerical simulation.

Influence of Coanda surface curvature on performance of bladeless fan

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Journal of Thermal Science 2014年第5期23卷 422-431页

作者： LI Guoqi HU Yongjun JIN Yingzi toshiaki Setoguchi Heuy Dong Kim Zhejiang Province Key Laboratory of Fluid Transmission Technology Zhejiang Sci-Tech University Department of Mechanical Engineering Saga University Honjo-machiSaga840-8502Japan School of Mechanical Engineering Andong National UniversitySeongcheon-Dong1375Gyeongdong-RDAndongGyeongsangnuk-DO760-749Korea

The unique Coanda surface has a great influence on the performance of bladeless ***,there is few studies to explain the relationship between the performance and Coanda surface curvature at *** order to gain a qualitative understanding of effect of the curvature on the performance of bladeless fan,numerical studies are performed in this ***,three-dimensional numerical simulation is done by Fluent *** the purpose to obtain detailed information of the flow field around the Coanda surface,two-dimensional numerical simulation is also *** types of Coanda surfaces with different curvature are designed,and the flow behaviour and the performance of them are analyzed and compared with those of the *** analysis indicates that the curvature of Coanda surface is strongly related to blowing performance,It is found that there is an optimal curvature of Coanda surfaces among the studied *** result shows that there is a special low pressure *** increasing curvature in Y direction,several low pressure regions gradually enlarged,then begin to merge slowly,and finally form a large area of low *** the analyses of streamlines and velocity angle,it is found that the magnitude of the curvature affects the flow direction and reasonable curvature can induce fluid flow close to the ***,it leads to that the curvature of the streamlines is consistent with that of Coanda ***,it also causes the fluid movement towards the most suitable *** study will provide useful information to performance improvements of bladeless fans.

关键词： bladeless fan Coanda surface velocity low pressure region curvature.

Detrital zircon geochronology of the Lutzow-Holm Complex,East Antarctica:Implications for Antarctica-Sri Lanka correlation

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Geoscience Frontiers 2018年第2期9卷 355-375页

作者： Yusuke Takamura toshiaki Tsunogae M.Santosh Yukiyasu Tsutsumi Graduate School of Life and Environmental Sciences University of TsukubaIbaraki 305-8572Japan Department of Geology University of JohannesburgAuckland Park 2006South Africa School of Earth Sciences and Resources China University of Geosciences Beijing29 Xueyuan RoadBeijing 100083China Centre for Tectonics Resources and Exploration Department of Earth SciencesUniversity of AdelaideSA 5005Australia Department of Geology and Paleontology National Museum of Nature and ScienceIbaraki 305-0005Japan

The Lützow-Holm Complex(LHC) of East Antarctica has been regarded as a collage of Neoarchean(ca.2.5 Ga), Paleoproterozoic(ca. 1.8 Ga), and Neoproterozoic(ca. 1.0 Ga) magmatic arcs which were amalgamated through the latest Neoproterozoic collisional events during the assembly of Gondwana supercontinent. Here, we report new geochronological data on detrital zircons in metasediments associated with the magmatic rocks from the LHC, and compare the age spectra with those in the adjacent terranes for evaluating the tectonic correlation of East Antarctica and Sri Lanka. Cores of detrital zircon grains with high Th/U ratio in eight metasediment samples can be subdivided into two dominant groups:(1) late Meso-to Neoproterozoic(1.1-0.63 Ga) zircons from the northeastern part of the LHC in Prince Olav Coast and northern Soya Coast areas, and(2) dominantly Neoarchean to Paleoproterozoic(2.8-2.4 Ga) zircons from the southwestern part of the LHC in southern Lutzow-Holm Bay area. The ca.1.0 Ga and ca. 2.5 Ga magmatic suites in the LHC could be proximal provenances of the detrital zircons in the northeastern and southwestern LHC, respectively. Subordinate middle to late Mesoproterozoic(1.3-1.2 Ga) detrital zircons obtained from Akarui Point and Langhovde could have been derived from adjacent Gondwana fragments(e.g., Rayner Complex, Eastern Ghats Belt). Meso-to Neoproterozoic domains such as Vijayan and Wanni Complexes of Sri Lanka, the southern Madurai Block of southern India, and the central-western Madagascar could be alternative distal sources of the late Meso-to Neoproterozoic zircons. Paleo-to Mesoarchean domains in India, Africa, and Antarctica might also be distal sources for the minor ~2.8 Ga detrital zircons from Skallevikshalsen. The detrital zircons from the Highland Complex of Sri Lanka show similar Neoarchean to Paleoproterozoic(ca. 2.5 Ga) and Neoproterozoic(ca. 1.0 Ga) ages, which are comparable with those of the LHC, suggesting that the two complexes might have form

关键词： The northern Lützow-Holm-Vijayan Complex Zircon U-Pb geochronology Crustal evolution Tectonic correlations Gondwana supercontinent