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Emerging material engineering strategies for amplifying photothermal heterogeneous CO_(2)catalysis

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Journal of Energy Chemistry 2021年第8期30卷 108-125,I0004页

作者： Bingqiao Xie Emma Lovell Tze Hao Tan Salina Jantarang Mengying Yu Jason Scott Rose Amal Particles and Catalysis Research Group School of Chemical EngineeringThe University of New South Wales2052 SydneyAustralia Department of Chemistry Faculty of Science Kyushu UniversityMoto-oka744 Nishi-ku819-0395 FukuokaJapan

Closing the carbon loop,through CO_(2)capture and utilization,is a promising route to mitigate climate *** energy is a sustainable energy source which can be exploited to drive catalytic reactions for utilizing CO_(2),including converting the CO_(2)into useful *** energy can be harnessed through a range of different pathways to valorize CO_(2).Whilst using solar energy to drive CO_(2)reduction has vast potential to promote catalytic CO_(2)conversions,the progress is limited due to the lack of understanding of property-performance relations as well as feasible material engineering ***,we outline the various driving forces involved in photothermal CO_(2)*** heat from solar energy can be utilized to induce CO_(2)catalytic reduction reactions via the photothermal ***,solar energy can act to modify reaction pathways through light-matter ***-induced chemical functions have demonstrated the ability to regulate intermediary reaction steps,and thus control the reaction *** catalyst structures and specific catalyst design strategies are discussed in this *** review provides a comprehensive understanding of the heat-light synergy and guidance for rational photothermal catalyst design for CO_(2)utilization.

关键词： CO_(2)reduction Photothermal catalysis Material engineering strategies Plasmonic photocatalysis

Effect of FeO concentration in sinter iron ore on reduction behavior in a hydrogen-enriched blast furnace

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International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1820-1829页

作者： Ko-ichiro Ohno Takayuki Maeda Kazuya kunitomo Masashi Hara Department of Materials Faculty of EngineeringKyushu University744 MotookaNishi-kuFukuoka 819-0395Japan Kashima Area East Nippon WorksNippon Steel Corporation3 HikariKashima CityIbaraki 314-0014Japan

Japan started the national project“COURSE 50”for CO_(2) reduction in the *** project aimed to establish novel technologies to reduce CO_(2) emissions with partially utilization of hydrogen in blast furnace-based ironmaking by 30%by around 2030 and use it for practical applications by *** idea is that instead of coke,hydrogen is used as the reducing agent,leading to lower fossil fuel consumption in the *** has been reported that the reduction behavior of hematite,magnetite,calcium ferrite,and slag in the sinter is different,and it is also considerably influenced by the sinter *** study aimed to investigate the reduction behavior of sinters in hydrogen enriched blast furnace with different mineral morphologies in CO-CO_(2)-H2 mixed *** an experimental sample,two sinter samples with significantly different hematite and magnetite ratios were prepared to compare their reduction *** reduction of wustite to iron was carried out at 1000,900,and 800℃ in a CO-CO_(2)-H2 atmosphere for the mineral morphology-controlled sinter,and the following findings were *** reduction rate of smaller amount of FeO led to faster increase of the reduction rate curve at the initial stage of ***-observations of reduced samples showed that the reaction proceeded from the outer periphery of the sample toward the inside,and a reaction interface was observed where reduced iron and wustite ***-observations revealed three layers,namely,wustite single phase in the center zone of the sample,iron single phase in the outer periphery zone of the sample,and iron oxide-derived wustite FeO and iron,or calcium ferritederived wustite'FeO'and iron in the reaction interface zone.A two-interface unreacted core model was successfully applied for the kinetic analysis of the reduction reaction,and obtained temperature dependent expressions of the chemical reaction coefficients from each mineral phases.

关键词： hydrogen reduction wustite hematite magnetite calcium ferrite two-interface unreacted core model COURSE50

Design of Electrohydrodynamic Devices with Consideration of Electrostatic Energy

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Cyborg and Bionic Systems 2021年第1期2021卷 32-39页

作者： Tasuku Sato Shinya Sakuma Masato Hijikuro Shingo Maeda Masayuki Anyoji Yoko Yamanishi Kyushu University 744 MotookaNishi-kuFukuoka 819-0395Japan Kyushu University 6-1 Kasuga KoenKasuga-shiFukuoka 816-8580Japan Shibaura Institute of Technology 3-7-5 ToyosuKoto-kuTokyo 135-8548Japan

The importance of actuators that can be integrated with flexible robot structures and mechanisms has increased in recent years with the advance of soft *** particular,electrohydrodynamic(EHD)actuators,which have expandable integrability to adapt to the flexible motion of soft robots,have received much attention in the field of soft *** have deepened the understanding of steady states of EHD phenomena but nonsteady states are not well *** herein observe the development process of fluid in a microchannel adopting a Schlieren technique with the aid of a high-speed *** addition,we analyze the behavior of fluid flow in a microchannel that is designed to have pairs of parallel plate electrodes adopting a computational fluid dynamics *** indicate the importance of considering flow generated by electrostatic energy,which tends to be ignored in constructing and evaluating EHD devices,and by the body force generated by the ion-drag *** considering these effects,we estimate the development process of EHD flow and confirm the importance of considering the generation of vortices and their interactions inside the microchannel during the development of EHD devices.

关键词： EHD flow electrostatic

Copper-ceria solid solution with improved catalytic activity for hydrogenation of CO to CHOH

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Chinese Journal of Catalysis 2020年第9期41卷 1348-1359页

作者： Bin Yang Wei Deng Limin Guo Tatsumi Ishihara School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074HubeiChina International Institute for Carbon-Neutral Energy Research Kyushu University744 MotookaNishi-kuFukuoka 8190395Japan Department of Applied Chemistry Faculty of EngineeringKyushu University744 MotookaNishi-kuFukuoka 8190395Japan

A copper-ceria solid solution and ceria-supported copper catalysts were prepared and used for the catalytic hydrogenation of CO2 to *** to site-specific classification and quantitative analyses(X-ray diffraction,Raman spectroscopy,X-ray photoelectron spectroscopy,H2 temperature-programmed reduction,and CO adsorption),the interfaces of the prepared catalysts were classified as Cu incorporated into ceria(Cu-Ov-Cex),dispersed Cu O(D-Cu O-Ce O2),and bulk Cu O(B-Cu O-Ce O2)over the Ce O2 *** results,together with those of activity tests,showed that the Cu-Ov-Cex species was closely related to the CO2 hydrogenation activity and resulted in a much higher turnover frequency of CH3OH production than that observed with the D-Cu O-Ce O2 and B-Cu O-Ce O2 ***,the copper-ceria solid solution exhibited improved activity due to the higher Cu-Ov-Cex fraction.

关键词： Copper-ceria Solid solution CO2 hydrogenation Methanol Active site

Eddy Current Analyses by Domain Decomposition Method Using Double-Double Precision

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Computer Modeling in Engineering & Sciences 2018年第9期116卷 349-363页

作者： Mizuma Takehito Takei Amane University of Miyazaki 1-1Gakuen Kibanadai-nishiMiyazaki-shiMiyazakiJapan

A matrix equation solved in an eddy current analysis,??-??method based on a domain decomposition method becomes a complex symmetric *** general,iterative method is used as the *** of iterative method in an interface problem is improved by increasing an accuracy of a solution of an iterative method of a subdomain ***,it is difficult to improve the convergence by using a small convergence criterion in the subdomain ***,authors propose a method to introduce double-double precision into the interface problem and the subdomain *** proposed method improves the convergence of the interface *** this paper,first,we describe proposed ***,we confirm validity of the method by using Team Workshop Problem 7,standard model for eddy current ***,we show effectiveness of the method from two numerical results.

关键词： Double-double precision domain decomposition method eddy current analysis parallel finite element method

Utilization of cross-regional interconnector and pumped hydro energy storage for further introduction of solar PV in Japan

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Global Energy Interconnection 2020年第1期3卷 69-76页

作者： Shota Ichimura Renewable Energy Institute 1-13-1 nishi-Shimbashi Minato-kuTokyoJapan

The amount of solar PV installed capacity has steadily increased to 44.5 GW at the end of FY2017,since the introduction of the Feed in Tariff(FiT)to Japan in *** the other hand,since the first curtailment of solar PV was conducted on October 13th,2018 in the Kyushu area,the curtailment has been frequently executed including wind power after *** this study,cross-regional interconnector and pumped hydro energy storage(PHES)are focused on mitigating *** Japan,there are 9 electric power areas which connected each other by cross-regional *** to the historical operation,cross-regional interconnectors were secured as emergency flexible measures,but after the implicit auction was started from October 2018,it is used on merit *** a PHES in Japan,they have been built with nuclear power plants for several *** the output of nuclear power generation is constant,so the PHES is used to absorb the surplus at nighttime when the demand *** nuclear power plants in Japan have been shut down after the accident at the Fukushima Daiichi Nuclear Power Plant following the Great East Japan Earthquake that occurred on March 11th,*** are several nuclear power plants that have been restarted(9 reactors,as of August 2019).In this study,the amount of curtailment for solar PV in the Kyushu area is sent to the Chugoku area using the cross-regional interconnector(Kanmon line).Then,the PHES in the Chugoku area is pumping with low *** the spot price in the market is low when the curtailment is *** that,the PHES is generating at night with high price when the solar PV is not *** makes a profit by the deference for the cost of pumping and the revenue of generating by the *** a calculation result,for one week from May 2nd to 8th,2019,a profit becomes 152.2 million JPY(about 1.22 million EUR).For this purpose,it is necessary to raise the operation capacity of the cross-regional interconnecto

关键词： Solar PV Cross-regional interconnector Pumped hydro energy storage(PHES) Curtailment

First-principles calculation of phase equilibria and phase separation of the Fe-Ni alloy system

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Rare Metals 2006年第5期25卷 437-440页

作者： Ying Chen Shuichi Iwata Tetsuo Mohri Department of Quantum Engineering and System Science School of Engineering The University of Tokyo Hongo 7-3-1 Bunkyo-ku Tokyo113-8656 Japan Graduate School of Frontier Sciences The University of Tokyo Hongo 7-3-1 Bunkyo-ku Tokyo 113-8656 Japan Division of Materials Science and Engineering Graduate School of Engineering Hokkaido University Kita-13 Nishi-8 Kita-ku Sapporo060-8628 Japan

Theoretical investigation of the phase equilibria of the Fe-Ni alloy has been performed by combining the FLAPW total energy calculations and the Cluster Variation Method through the Cluster Expansion Method. The calculations have proved the stabilization of the LIE phase at 1：3 stoichiometry, which is in agreement with the experimental result, and predicted the existence of L1 0 as a stable phase below 550 K; this L1 0 phase has been missing in the conventional phase diagram. The calculations are extended to the Fe-rich region that is characterized by a wide range phase separation and has drawn considerable attention because of the intriguing Invar property associated with a Fe concentration of 65%. To reveal the origin of the phase separation, a P-V curve in an entire concentration range is derived by the second derivative of free energy functional of the disordered phase with respect to the volume. The calculation confirmed that the phase separation is caused by the breakdown of the mechanical-stability criterion. The newly calculated phase separation line combined with the L1 0 and L12Eorder-disordered phase boundaries provides phase equilibria in the wider concentration range of the system. Furthermore, a coefficient of thermal expansion （CTE） is attempted by incorporating the thermal vibration effect through harmonic approximation of the Debye-Gruneisen model. The Invar behavior has been reproduced, and the origin of this anomalous volume change has been discussed.

关键词： Fe-Ni alloy system order-disorder separation magnetism first-principles calculations cluster variation method cluster expansion method Debye-Gruneisen model

Three cases of retroperitoneal schwannoma diagnosed by EUS-FNA

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World Journal of Gastroenterology 2011年第29期17卷 3459-3464页

作者： Taiki kudo Hiroshi Kawakami Masaki kuwatani Nobuyuki Ehira Hiroaki Yamato Kazunori Eto Kanako kubota Masahiro Asaka Department of Gastroenterology Hokkaido University Graduate School of MedicineKita 15Nishi 7Kita-kuSapporo060-8638Japan Department of Surgical pathology Hokkaido University HospitalKita 14Nishi 5Kita-kuSapporo060-8638Japan

Schwannomas are peripheral nerve tumors that are typically solitary and *** diagnosis is largely based on surgically resected ***,a number of case reports have indicated that retroperitoneal schwannomas could be diagnosed with endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA).We report the diagnosis of three cases of schwannoma using *** were two males and one female,ages 22,40,and 46 years,respectively,all of whom were *** findings showed well-circumscribed round ***,as the tumors could not be diagnosed using these findings alone,EUS-FNA was ***-eosin staining of the resulting tissue fragments revealed bland spindle cells with nuclear *** was no disparity in nuclear *** revealed S-100 protein positivity and all cases were diagnosed as ***-67 indexes were 3%-15%,2%-3%,and 3%,*** case showed any signs of *** most schwannomas are benign tumors and seldom become malignant,we observed these patients without *** tumors demonstrated no enlargement and no change in *** are almost always benign and can be observed following diagnosis by EUS-FNA.

关键词： Schwannoma Endoscopic ultrasonography Fine-needle aspiration Retroperitoneal tumor S100 proteins Ki-67 index

High-Resolution Spectroscopy of Winds Associated with T Tauri Stars

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Research in Astronomy and Astrophysics 2016年第2期16卷 89-96页

作者： Naoto Iguchi Yoichi Itoh Graduate School of Science Kobe University1-1 Rokkodai-choNada-kuKobeHyogo 657-8501Japan nishi-Harima Astronomical Observatory Center for AstronomyUniversity of Hyogo407-2NishigaichiSayoHyogo 679-5313Japan

We carried out optical high-resolution spectroscopy of T Tauri stars using the Subaru Telescope. Using archived data from the Keck Telescope and the Very Large Telescope, we detected forbidden lines of [S II] at 4069A, in addition to those of [O I] at 5577 A and 6300A, for 13 T Tauri stars. We consider that low-velocity components of these forbidden lines emanate from the wind associated with T Tauri stars. Using two flux ratios of the three lines, we simultaneously determined the hydrogen density and temperature of the winds. The winds ofT Tauri stars have a hydrogen density of 2.5 × 106 cm^-3 - 2.5 × 10^9 cm^-3 and a temperature of 10 800 -18 000 K. The mass loss rates by the wind are estimated to lie in the range from 2.0 × 10^-10 M⊙ yr-1 to 1.4× 10^-9 M⊙ yr-1. The mass loss rates are found to increase with increasing mass accretion rates. The ratio of the mass loss rate to the mass accretion rate is 0.001-0.1 for classical T Tauri stars and 0.1-1 for transitional disk objects.

关键词： stars pre-main sequence -- stars emission lines