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Photonics Research 2021年第8期9卷 1550-1558页

作者： BOZHANG DONG JIANAN DUAN HEMING HUANG JUSTIN CNORMAN kenichi nishi KEIZO TAKEMASA MITSURU SUGAWARA JOHN EBOWERS FRéDéRIC GRILLOT LTCI Telecom ParisInstitut Polytechnique de Paris19 Place Marguerite Perey91120 PalaiseauFrance Institute for Energy Efficiency University of CaliforniaSanta BarbaraCalifornia 93106USA Materials Department University of CaliforniaSanta BarbaraCalifornia 93106USA QD Laser Inc.KawasakiKanagawa 210-0855Japan Department of Electrical and Computer Engineering University of CaliforniaSanta BarbaraCalifornia 93106USA Center for High Technology Materials University of New-MexicoAlbuquerqueNew Mexico 87106USA Current address:State Key Laboratory on Tunable Laser Technology School of Electronic and Information EngineeringHarbin Institute of TechnologyShenzhen 518055China

This work reports on a high-efficiency In As/Ga As distributed feedback quantum dot *** large optical wavelength detuning at room temperature between the lasing peak and the gain peak causes the static,dynamic,and nonlinear intrinsic properties to all improve with temperature,including the lasing efficiency,the modulation dynamics,the linewidth enhancement factor,and consequently the reflection *** reported show an optimum operating temperature at 75°C,highlighting the potential of the large optical mismatch assisted single-frequency laser for the development of uncooled and isolator-free high-speed photonic integrated circuits.

关键词： mismatch optical tuning

Quantum dot mode-locked frequency comb with ultra-stable 25.5 GHz spacing between 20℃ and 120℃

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Photonics Research 2020年第12期8卷 1937-1942页

作者： SHUJIE PAN JIANOU HUANG ZICHUAN ZHOU ZHIXIN LIU LALITHA PONNAMPALAMZIZHUO LIU MINGCHU TANG MU-CHIEH LO ZIZHENG CAO kenichi nishi KEIZO TAKEMASA MITSURU SUGAWARA RICHARD PENTY IAN WHITE ALWYN SEEDS HUIYUN LIU SIMING CHEN Department of Electronic and Electrical Engineering University College LondonTorrington PlaceLondonWC1E 7JEUnited Kingdom Institute of Photonic Integration Eindhoven University of TechnologyEindhoven 5600 MBThe Netherlands QD Laser Inc.Kawasaki 210-0855Japan Centre for Photonics Systems Department of EngineeringUniversity of CambridgeCambridge CB3 OFAUnited Kingdom

Semiconductor mode-locked lasers(MLLs)are promising frequency comb sources for dense wavelength-divisionmultiplexing(DWDM)data *** data communication requires a frequency-stable comb source in a temperature-varying environment and a minimum tone spacing of 25 GHz to support high-speed DWDM *** the best of our knowledge,however,to date,there have been no demonstrations of comb sources that simultaneously offer a high repetition rate and stable mode spacing over an ultrawide temperature ***,we report a frequency comb source based on a quantum dot(QD)MLL that generates a frequency comb with stable mode spacing over an ultrabroad temperature range of 20–120℃.The two-section passively mode-locked In As QD MLL comb source produces an ultra-stable fundamental repetition rate of 25.5 GHz(corresponding to a 25.5 GHz spacing between adjacent tones in the frequency domain)with a variation of 0.07 GHz in the tone spacing over the tested temperature *** keeping the saturable absorber reversely biased at-2 V,stable mode-locking over the whole temperature range can be achieved by tuning the current of the gain section only,providing easy control of the *** an elevated temperature of 100℃,the device shows a 6 d B comb bandwidth of 4.81 nm and 31 tones with>36 d B optical signal-to-noise *** corresponding relative intensity noise,averaged between 0.5 GHz and 10 GHz,is-146 d Bc∕*** results show the viability of the In As QD MLLs as ultra-stable,uncooled frequency comb sources for low-cost,large-bandwidth,and low-energy-consumption optical data communications.

关键词： DWDM mode noise

SPERA Hydrogen System^(TM)by LOHC-MCH Method for Massive Hydrogen Storage and Transportation

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Journal of Environmental Science and Engineering(A) 2024年第2期13卷 50-60页

作者： Yoshimi Okada Kaji Naohiro Osamu Ikeda kenichi Imagawa Hironori Kawai Masashi Nagai Yasuhiro Inoue Frontier Business Division Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan Hydrogen Business Department Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan R&D Center Chiyoda Corporation3-13 Moriya-cho Kanagawa-kuYokohama 2208765Japan Technology Development Department Chiyoda Corporation4-6-2 Minatomirai Nishi-kuYokohama 2208765Japan

Expanding the hydrogen energy utilization is essential for decarbonization,and the commercialization of hydrogen energy carrier systems that can“store”and“transport”hydrogen in a large scale is *** organic chemical hydride method incorporates hydrogen atoms into the molecular structure of a LOHC(Liquid Organic Hydrogen Carrier)to store and transport hydrogen in a liquid state under normal temperature and pressure,and is a highly safe method with low business *** has been developing the technology since 2002,completed a pilot demonstration in 2014 and named it the SPERA Hydrogen^(TM) System,and successfully completed an international supply chain demonstration that transports hydrogen from Brunei to Japan in a large scale in 2020,moving to the commercialization ***,Chiyoda is conducting feasibility studies with a number of domestic and foreign companies with the aim of commercializing the system as soon as *** this paper,outline,features,development status and our efforts in commercialization of SPERA HydrogenTM System are introduced.

关键词： Hydrogen carrier LOHC Methylcyclohexane MCH toluene

Low temperature surface oxygen activation in crystalline MnO_(2) triggered by lattice confined Pd single atoms

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Journal of Energy Chemistry 2021年第11期30卷 136-144,I0003页

作者： Xuemei Liao Yonghui Zhao Changwen Liu Xiaopeng Li Yu Sund kenichi Kato Miho Yamauchi Zheng Jiang College of Food and Biological Engineering Xihua UniversityChengdu 610039SichuanChina CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research Institute(SARI)Chinese Academy of Sciences(CAS)No.100Haike RoadPudong New DistrictShanghai 201210China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityNo.2999 North Renmin RoadSongjiang DistrictShanghai 201620China Institute for the Advancement of Higher Education Hokkaido UniversitySapporo 060-0817Japan Department of Chemistry Faculty of ScienceHokkaido UniversityN10W8Kita-kuSapporoHokkaido 060-0810Japan RIKEN SPring-8 Center1-1-1 KoutoSayo-choSayo-gunHyogo 679-5148Japan International Institute for Carbon-Neutral Energy Research(WPI-I2CNER) Kyushu UniversityMotooka 744Nishi-kuFukuoka 819-0395Japan Advanced Institute for Materials Research(AIMR) Tohoku University2-1-1 KatahiraAoba-kuSendai 980-8577Japan Shanghai Synchrotron Radiation Facility Zhangjiang LabShanghai Advanced Research Institute(SARI)Chinese Academy of Sciences(CAS)No.239 Zhangheng RoadPudong New DistrictShanghai 201203China Shanghai Institute of Applied Physics Chinese Academy of ScienceNo.2019 Jia Luo RoadJiading DistrictShanghai 201800China

Tuning the coordination environment is the research axis of single atom catalysts (SACs). SACs are commonly stabilized by various defects from support. Here, we report a lattice confined Pd SAC using MnO_(2) as support. Compared with the Pd clusters anchored on the surface, the lattice confined Pd single atoms allows spontaneous exaction of surrounding lattice oxygen at room temperature when employed in CO oxidation. The MnO_(2) supported Pd SAC exhibited a high turnover frequency of 0.203 s^(−1) at low reaction temperature, which is higher than that of recently reported Pd SACs. Theoretical calculations also confirmed the confined monatomic Pd activate lattice oxygen with an ultralow energy barrier. Our results illustrate that the unique coordination environment of single atom provided by lattice confinement is promising to boost the activity of SACs.

关键词： Single atom catalysts(SACs) Lattice confinement Oxygen activation Manganese oxide nanofiber

Laparoscopic partial resection for hemangioma in the third portion of the duodenum

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World Journal of Gastroenterology 2014年第34期20卷 12341-12345页

作者： Shingo Kanaji Tetsu Nakamura Masayasu nishi Masashi Yamamoto Kiyonori Kanemitu Kimihiro Yamashiita Tatsuya Imanishi Yasuo Sumi Satoshi Suzuki kenichi Tanaka Yoshihiro Kakeji Department of Gastrointestinal Surgery Faculty of MedicineHyogo 650-0017Japan

Benign duodenal tumors are rare and less commonthan malignant ***,vascular lesionsof the duodenum,including hemangiomas,are rarecauses of gastrointestinal *** report describes a case with bleeding hemangiomas in the thirdportion of the duodenum and jejunum and their successful treatment using a laparoscopic *** no report of totally laparoscopic resection for tumorin the third portion of *** performinga laparoscopic Kocher maneuver,the location of theduodenal hemangioma was confirmed by endoscopicand laparoscopic *** lesion was excisedusing ultrasonic coagulating shears and the defect inthe duodenal wall was sutured *** of the jejunum was treated extracorporeally through a 3.0 cm umbilical *** operatingtime was 241 min and blood loss was *** course was *** benign duodenal tumors in the third portion,if endoscopic resection is not adapted,this less invasive technique may be a standard treatment.

关键词： Hemangioma Third portion Duodenum Total laparoscop

A Role of Vaporization of Metal Oxide in Formation of SiO2 Scale on Metal Disilicides

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A Role of Vaporization of Metal Oxide in Formation of SiO2 S...

Spatial variability of chemical tracers in surface snow along the traverse route from the coast to 1000 km inland at east Dronning Maud Land, Antarctica

The Fourth International Conference on Physical and Numerical Simulation of Materials (ICPNS’2004)

作者： Kazuya Kurokawa kenichi Ohsasa Kiyotaka Matsuura Center for Advance Research of Energy Conversion Materials Hokkaido University Kita 13 Nishi 8 Kita-ku Sapporo 060-8628 Japan. Division of Molecular Chemistry Graduate School of Engineering Hokkaido University Kita 13 Nishi 8 Kita-ku Sapporo 060-8628. Japan. Materials Science and Engineering Graduate School of Engineering Hokkaido University Kita 13 Nishi 8 Kita-ku. Sapporo 060-8628 Japan.

It is well known that some metal disilicides, for example MoSi2 and WSi2, show excellent oxidation resistance at high temperatures. Therefore, these disilicides are being considered as promising materials for applications in oxidizing environments at ultra-high *** excellent oxidation resistance of the disilicides is due to the formation of a protective SiO2 scale. When a metal oxide formed as an oxidation product possesses a high vapor pressure, the vaporization often plays an important role in the formation of a protective SiO2 scale. That is to say, as a consequent of simultaneous formation of metal and silicon oxides at an early stage of oxidation and subsequent evaporation of the metal oxide, only SiO2 may remain on the disilicide substrate. The vapor pressures of MoO3, V2O5, WO3, and Re2O7 are very high, and the high vapor pressure must be advantageous for forming a SiO2 *** the present study, oxidation tests of some disilicides, MoSi2, WSi2, VSi2, and ReSi1.75, were carried out in air at temperatures ranging from 773 to 1773 K. Based on the results, a relationship between vapor pressure of metal oxide and formation of SiO2 scale was clarified. Namely, when the vapor pressure of metal oxide reaches 10 Pa, a SiO2 scale forms on the disilicides. The vapor pressure of 10 Pa corresponds to about 473 K in Re2O7, 1073 K in MoO3. 1173 K in V2O5. and 1673 K in WO3.

关键词： Metal oxide SiO2 Vaporization

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Chinese Journal of Polar Science 2003年第1期14卷 48-56页

作者： Toshitaka Suzuki Yoshinori Iizuka Teruo Furukawa kenichi Matsuoka Kokichi Kamiyama Okitsugu Watanabe Yamagata University Kojirakawa cho 1-chomeNational Institute of Polar ResearchKaga 1-chomeNational Institute of Polar ResearchKaga 1-chomeInstitute of Low Temperature Science Hokkaido UniversityNational Institute of Polar ResearchKaga 1-chomeNational Institute of Polar ResearchKaga 1-chome Yamagata 990-8560 Itabashi kuTokyo 173-8515 Itabashi kuTokyo 173-8515 Kita-19 Nishi-8 Kita-ku Sapporo 060-0819Itabashi kuTokyo 173-8515 Itabashi kuTokyo 173-8515

We measured the spatial variability of Cl -, Na +, SO 2- 4, NO - 3 and 7Be concentrations in snow cover along the traverse route from S16 to Dome Fuji station in east Dronning Maud Land, Antarctica. The concentrations of Cl - and Na + at the coast exponentially decreased with distance from the coast up to 200 km inland. Between 200 1000 km inland, the concentrations of Na + were nearly constant. On the other hand, the concentrations of Cl - increased with distance beyond 750 km inland. Furthermore, the contribution factors between Cl - and Na + decreased and the Cl -/Na + ratio and the nssCl -/Cl - ratio increased toward the interior of the continent. These results indicate that sea salt aerosols are transported from the coastal region toward the inland region of the Antarctic continent, and that a source of Cl - other than sea salt exists in the inland plateau of Antarctica. The concentrations of SO 2- 4, NO - 3 and 7Be in snow were relatively high in the coastal region and the inland plateau region compared with those in the katabatic wind region.

关键词： Antarctica snow chemistry spatial variability atmospheric transport.

A Method to Evaluate Abrasion of Shoe-Sole Using 3D Scanning Technique

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Journal of Sports Science 2016年第5期4卷 279-286页

作者： Glen Lim Chun Yee Yeo Joon Hock Tsuyoshi nishiwaki Kenta Moriyasu kenichi Harano Nanyang Technological University~School of Mechanical & Aerospace Engineering 50 Nanyang Avenue Singapore 639798Singapore ASICS Institute of Sport Science ASICS Corporation 2-1 Takatsukadai 6-chome Nishi-ku Kobe 651-2271 Japan