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Observation of~100%valley-coherent excitons in monolayer MoS_(2) through giant enhancement of valley coherence time

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Light(Science & Applications) 2023年第8期12卷 1644-1650页

作者： Garima Gupta Kenji Watanabe takashi Taniguchi Kausik Majumdar Department of Electrical Communication Engineering Indian Institute of ScienceBangaloreIndia Research Center for Functional Materials National Institute for Materials ScienceTsukubaJapan international Center for Materials Nanoarchitectonics National Institute for Materials ScienceTsukubaJapan

In monolayer transition metal dichalcogenide semiconductors,valley coherence degrades rapidly due to a combination of fast scattering and inter-valley exchange *** leads to a sub-picosecond valley coherence time,making coherent manipulation of exciton a highly challenging task Using monolayer MoS_(2) sandwiched between top and bottom graphene,here we demonstrate fully valley-coherent excitons by observing~100%degree of linear polarization in steady state *** is achieved in this unique design through a combined effect of(a)suppression in exchange interaction due to enhanced dielectric screening,(b)reduction in exciton lifetime due to a fast inter-layer transfer to graphene,and(c)operating in the motional narrowing *** disentangle the role of the key parameters affecting valley coherence by using a combination of calculation(solutions of Bethe-Salpeter and Maiallle-Silva-Sham equations)and a careful choice of design of experiments using four different stacks with systematic variation of screening and exciton *** the best of our knowledge,this is the first report in which the excitons are found to be valley coherent in the entire lifetime in monolayer semiconductors,allowing optical readout of valley coherence possible.

关键词： coherent monolayer lifetime

Limb Stiffness Improvement of the Robot WAREC-1R for a Faster and Stable New Ladder Climbing Gait

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Journal of Bionic Engineering 2023年第1期20卷 57-68页

作者： Xiao Sun Akira Ito takashi Matsuzawa Atsuo Takanishi Department of Mechatronics University of YamanashiYamanashi400-8511Japan Faculty of Science and Engineering Waseda UniversityTokyo162-8480Japan

Ladder climbing is a relatively new but practical locomotion style for robots. Unfortunately, due to their size and weight, ladder climbing by human-sized robots developed so far is struggling with the speedup of ladder climbing motion itself. Therefore, in this paper, a new ladder climbing gait for the robot WAREC-1R is proposed by the authors, which is both faster than the former ones and stable. However, to realize such a gait, a point that has to be taken into consideration is the deformation caused by the self-weight of the robot. To deal with this issue, extra hardware (sensor) and software (position and force control) systems and extra time for sensing and calculation were required. For a complete solution without any complicated systems and time only for deformation compensation, limb stiffness improvement plan by the minimal design change of mechanical parts of the robot is also proposed by the authors, with a thorough study about deformation distribution in the robot. With redesigned parts, ladder climbing experiments by WAREC-1R proved that both the new ladder climbing gait and the limb stiffness improvement are successful, and the reduced deformation is very close to the estimated value as well.

关键词： Ladder climbing Legged robot Bionic robot Gait.Stiffness improvement Finite element analysis

The effect of interface roughness on the perpendicular exchange bias of NiO/CoPt/Pt stacking structure

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Science China(Technological Sciences) 2021年第3期64卷 605-610页

作者： GAO Ying HARUMOTO takashi NAKAMURA Yoshio SHI Ji Department of Materials Science and Engineering Tokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

An orthogonal coupling structure of NiO/CoPt/Pt/glass with perpendicular exchange bias effect has been *** exchange bias is found to be strongly dependent on the interface roughness between NiO and CoPt *** conventional inverse proportionality of the exchange bias field with the ferromagnetic thickness is not applicable to this top-pinned stacking ***,an anomalous ferromagnetic thickness dependence of blocking temperature is also observed.A simulation on the basis of a spin configuration model with defects at the interface agrees well with the experimental *** findings suggest considerable contribution of the interface roughness to the perpendicular exchange bias.

关键词： perpendicular exchange bias interface roughness FM thickness blocking temperature

BIOLOGICAL TREATING TECHNOLOGY TO REMOVE PHENOLS IN FCCU EFFLUENT

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石油学报（石油加工） 2001年第1期17卷 81-84页

作者： Takahashi, takashi Nippon Mitsubishi Oil Corp. Tech. G. Overseas Business Dept. Minato-ku Tokyo 108-0074 18-10 2-Chome Takanaua Japan

Baesd on the survey in 1997 fiscal year, we have been making a further survey and study together with 中国石油(Petro China) at Liaohe Refinery since 1998 fiscal year, aiming at the transfer of Japanese waste water treating technologies to China.　　Scope is as follows:　　（1） Demonstration of a new waste water treating technology, a kind of biological treating methods (Fluidized bed biological treatment), to eliminate phenols in FCCU effluent.　　（2） Recommendation of eliminating pollutant and reducing total effluent by improving the operation.　　1　Fluidized bed biological treatment1.1　What is fluidized bed biological treatment　　Fluidized bed biological treatment is the process to treat waste water as follows:　　(1) To put biologically inert granular matters (fluidized carrier) into an aeration tank;　　(2) Homogeneously and entirely to fluidize the particles in the tank to form highly active biofilm on the surface of each particle;　　(3) To contact organic substances with these microorganisms to purify the waste water.　　The surface area of the particle per unit volume is about ten times as large as that in conventional biofilm treatment process. In addition, no blockade of the filler (carrier) may be caused. Accordingly, volumetric loading of the aeration tank can be improved to attain highly efficient treatment.

关键词：流化床生态实验 FCCU 炼油工艺

The effect of basic fibroblast growth factor on regeneration in a surgical wound model of rat submandibular glands

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International Journal of Oral Science 2016年第1期8卷 16-23页

作者： Fumitaka Kobayashi Kenichi Matsuzaka takashi Inoue Department of Clinical Pathophysiology Tokyo Dental CollegeTokyoJapan

This study developed an animal model of surgically wounded submandibular glands （SMGs） and investigated the effects of collagen gel with basic fibroblast growth factor （bFGF） on tissue regeneration of surgically wounded SMGs in vivo. The animal model was produced by creating a surgical wound using a 3-mm diameter biopsy punch in SMGs. The wound was filled with collagen gel with bFGF （bFGF group） or without bFGF （control group）. In the animal model of surgically wounded SMGs, salivary glands without scar tissue around the wound area were observed with smaller areas of collagen gel. Small round and spindle-shape cells invaded the collagen gel in both groups after operation day （AOD） 5, and this invasion dramatically increased at AOD 7. Host tissue completely replaced the collagen gel at AOD 21. The invading immune cells in the group treated with collagen gel with bFGF were positive for vimentin, g-smooth muscle actin （αSMA）, CD49f, c-kit and AQP5 at AOD 7. Similarly, the mRNA expression of vimentin, αSMA, CD49f, keratin 19 and AQP5 was also increased. This study suggests that the use of collagen gels with bFGF improves salivary gland regeneration.

关键词： animal model basic fibroblast growth factor collagen immunohistochemistry salivary gland wound healing

Importance of early detection of esophageal cancer before the tumor progresses too much for effective treatment

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World Journal of Gastrointestinal Oncology 2024年第8期16卷 3382-3385页

作者： takashi Ono Radiation Oncology Faculty of MedicineYamagata UniversityYamagata 990-9585Japan

This editorial comments on an article by Qu et al published in the World Journal of Gastrointestinal *** focuses on the importance of early detection of esophageal cancer,including recurrence or secondary malignancy after chemoradiotherapy(CRT).Endoscopic resection is the first choice for treatment for esophageal cancer remaining within the mucous membrane,while surgery or radical CRT are treatment options for advanced stages depending on the patient’s general condition and *** these treatments are potentially curative,they are more invasive than endoscopic ***-stage esophageal cancer is often asymptomatic and difficult to *** periodic endoscopy is *** less burdensome tests exist,including liquid biopsy and urinary biomarkers,these have not yet been widely used in clinical *** detection is important after radical CRT because the local recurrence rate is higher than that after ***,endoscopic resection or photodynamic therapy is indicated if detected in the early stages,and positive results have been *** detection of esophageal cancer is *** is the main diagnostic method;however,new and less burdensome methods should be established to ensure early treatment for patients with esophageal cancer.

关键词： Esophageal neoplasms Screening Endoscopy Prognosis Endoscopic mucosal resection Endoscopic submucosal dissection Photodynamic therapy

Light Front Fermion Model Propagation

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Communications in Theoretical Physics 2013年第7期60卷 55-68页

作者： Jorge Henrique Sales Alfredo takashi Suzukil Universidade Estadual de Santa Cruz km 16 Rodovia Jorge Amado-45662-900-Ilhéus BA Brazi Physics and Engineering Department Southern Adventist University 4881 Taylor Circle-Collegedale TN 37315 USA Instituto de Física Terica UNESP-Universidade Estadual Paulista Rua Dr. Bento Teobaldo Ferraz 271-Bloco II Barra Funda 01140-070 So Paulo So Paulo Brazil

In this work we consider the propagation of two fermion fields interacting with each other by the exchange of intermediate scalar bosons in the light front. We obtain the corrections up to fourth order in the coupling... 详细信息

关键词： light front Fermions propagations

Light Front Boson Model Propagation

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Communications in Theoretical Physics 2011年第6期55卷 1029-1040页

作者： Jorge Henrique Sales Alfredo takashi Suzuki Universidade Estadual de Santa Cruz km 16 Rodovia Ilheus-Itabuna-45662-900-IlheusBABrazil Instituto de Fisica Teorica UNESP-Universidade Estadual PaulistaRua Dr.Bento Teobaldo Ferraz 271-Bl.ⅡBarra Funda01140-070Sao PauloSao PauloBrazil

The scope and aim of this work is to describe the two-body interaction mediated by a particle （either the scalar or the gauge boson） within the light-front formulation. To do this, first of all we point out the importance of propagators and Green functions in Quantum Mechanics. Then we project the covariant quantum propagator onto the light front time to get the propagator for scalar particles in these coordinates. This operator propagates the wave function from x＋ = 0 to x＋〉 0. It corresponds to the definition of the time ordering operation in the light front time x＋. We calculate the light-front Green＇s function for 2 interacting bosons propagating forward in x＋. We also show how to write down the light front Green＇s function from the Feynman propagator and finally make a generalization to N bosons.

关键词： insert light-front bosons propagation

Energetics of dioxygen binding into graphene patches with various sizes and shapes

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Science China Chemistry 2012年第5期55卷 787-795页

作者： YUMURA takashi KOBAYASHI Hisayoshi YAMABE Tokio Department of Chemistry and Materials Technology Kyoto Institute of Technology Matsugasaki Sakyo-ku Kyoto 606-8585 Japan Nagasaki Institute of Applied Science 536 Aba-machi Nagasaki 851-0193 Japan

Density functional theory (DFT) calculations were employed to investigate the electronic properties of an H-atom terminated graphene patch (hydrographene) smaller than a rhombic C96H26 structure with zigzag edges. Depending on shapes and sizes of hydrographenes, some hydrographenes have the triplet ground state where unpaired electrons are localized on their zigzag edges. The stability of the triplet spin state is diminished, decreasing the hydrographene sizes. The existence of the localized spin densities allows triplet dioxgen to bind into a hydrographene. According to the DFT calculations, the energetics of the dioxygen bindings is negatively influenced by downsizing hydrographenes, as well as depends on their shapes. The size-and shape-dependences of the dioxygen bindings reflect from the stability of the triplet state of a hydrographene, because its localized unpaired electrons can be utilized to be attached to an unpaired electron of triplet dioxygen.

关键词： graphene size effect edge structure density functional theory calculation PACS number(s): 73.22.-f 73.22.Pr