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61.
Tatsuya Kitazawa Koichiro Yaji Kosuke Shimozawa Hiroshi Kondo Takayoshi Yamanaka Hiroshi Yaguchi Yukiaki Ishida Kenta Kuroda Ayumi Harasawa Takashi Iwahashi Yukio Ouchi Fumio Komori Shik Shin Kaname Kanai 《Advanced Materials Interfaces》2020,7(14)
Topological insulators (TIs) are expected to realize new spintronic devices with low dissipative electrical transport. Organic molecule/TI interfaces have been investigated to explore the potential of multifunctional organic molecules for TI devices. However, there is no unified understanding of the interfacial electronic structure. The electronic structure of the molecular side must be examined to fully understand the phenomena at the interface. Thus, this paper reports the investigation of the interface between the electron‐donating organic molecule tetrathianaphthacene (TTN) and prototypical TI Bi2Se3 by ultraviolet photoemission spectroscopy (UPS), X‐ray photoemission spectroscopy (XPS), and angle‐resolved photoemission spectroscopy (ARPES). The deformation of the Fermi surface of the topological surface states as well as the formation of a 2D electron gas state (2DEG) at the interface occurs upon TTN deposition onto Bi2Se3. Confinement of the 2DEG into the surface arises from band‐bending accompanied by electron donation from TTNs to Bi2Se3 according to XPS and UPS. The knowledge obtained in this work shed new light on the understanding of the electronic structure of organic molecules/TI interfaces and open the door to the TI applications via modification by electronic functional organic molecules. 相似文献
62.
Yuma Yokota Takashi Akihiro Surina Boerzhijin Takeshi Yamada Yoshio Makino 《Food Science & Nutrition》2019,7(2):773-778
Harvested tomatoes were stored under atmospheres that were normoxic, anoxic, or modified (altered O2 and CO2 concentrations). Each atmosphere was created by storing the tomatoes at 25°C for up to 8 days in different kinds of pouches. During storage, metabolites of the tomatoes were measured using metabolomics. We obtained score plots of the metabolites on eighth day of storage by principal component analysis. There was a tendency for groups to be divided on the basis of score plot according to the composition of each gas. PC1 and PC2 seemed to correspond to the influence of O2 and CO2 concentrations, respectively, and the total contribution rate of the two axes was 72%, so that we concluded that the metabolites were affected mainly by O2 and CO2 concentrations. The results indicate that metabolomics may be an effective tool to reveal the relationship between metabolic state of harvested fruits and the atmosphere. 相似文献
63.
Daobin Yang Takeshi Sano Yuma Yaguchi He Sun Hisahiro Sasabe Junji Kido 《Advanced functional materials》2019,29(12)
Low‐temperature‐processed inverted perovskite solar cells (PVSCs) attract increasing attention because they can be fabricated on both rigid and flexible substrates. For these devices, hole‐transporting layers (HTLs) play an important role in achieving efficient and stable inverted PVSCs by adjusting the anodic work function, hole extraction, and interfacial charge recombination. Here, the use of a low‐temperature (≤150 °C) solution‐processed ultrathin film of poly[(9,9‐dioctyl‐fluorenyl‐2,7‐diyl)‐co‐(4,4′‐(N‐(4‐secbutylphenyl) diphenylamine)] (TFB) is reported as an HTL in one‐step‐processed CH3NH3PbI3 (MAPbI3)‐based inverted PVSCs. The fabricated device exhibits power conversion efficiency (PCE) as high as 20.2% when measured under AM 1.5 G illumination. This PCE makes them one of the MAPbI3‐based inverted PVSCs that have the highest efficiency reported to date. Moreover, this inverted PVSC also shows good stability, which can retain 90% of its original efficiency after 30 days of storage in ambient air. 相似文献
64.
Takeshi Nakai Haruhiko Kurino Tomoki Yaguchi Naoki Kano 《JAPAN ARCHITECTURAL REVIEW》2019,2(3):269-286
We developed a large tuned mass damper (TMD) for counteracting the effects of long‐period earthquakes in existing high‐rise buildings. The TMD consists of a suspended weight and oil dampers with stroke control functions. The damper increases its damping coefficient when the TMD weight velocity reaches a predetermined value, preventing overstroke during large earthquakes. The system controls the TMD stroke with minimum impact on its response control performance. This paper describes the development and application of the TMD and verification of the response control performance using observation records. First, we examine the requirements for this type of TMD using a simple analytical model and determine the influence of the stroke control on the response control performance. Next, an example application is outlined. The components required for realization of the TMD are addressed, and a project for the seismic upgrade of an existing high‐rise building is described. To evaluate the response control performance, we developed accurate simulation models for the building and TMD, and we analytically confirmed the response control performance. Finally, this paper presents observation records obtained during an earthquake and strong wind. The control effect of the TMD was verified through comparison of the observation records and analytical results. 相似文献
65.
Yuji Sasaki Ryo Yoshimitsu Syouhei Nishihama Yuma Shimbori Hidenobu Shiroishi 《分离科学与技术》2017,52(7):1186-1192
A new extractant biuret(C8) is synthesized and tested for solvent extraction of hard acid metals, for example, actinides, and soft acid metals. This compound has a central frame similar to that of malonamide but with an additional amino functional group introduced into the central framework; in this case, both the amidic oxygen atoms and the amino nitrogen atom may bond with metals. We found that both hard and soft acid metals can be extracted from nitric or perchloric acids to n-dodecane using biuret(C8). It is clear that D(Pd, Pu, U) values of approximately 100 can be obtained using 0.1 M biuret(C8)/n-dodecane. 相似文献
66.
Youichi Tsuchiya Yuma Ishikawa Chihaya Adachi Jean‐Luc Brédas 《Advanced materials (Deerfield Beach, Fla.)》2017,29(46)
In the traditional molecular design of thermally activated delayed fluorescence (TADF) emitters composed of electron‐donor and electron‐acceptor moieties, achieving a small singlet–triplet energy gap (ΔEST) in strongly twisted structures usually translates into a small fluorescence oscillator strength, which can significantly decrease the emission quantum yield and limit efficiency in organic light‐emitting diode devices. Here, based on the results of quantum‐chemical calculations on TADF emitters composed of carbazole donor and 2,4,6‐triphenyl‐1,3,5‐triazine acceptor moieties, a new strategy is proposed for the molecular design of efficient TADF emitters that combine a small ΔEST with a large fluorescence oscillator strength. Since this strategy goes beyond the traditional framework of structurally twisted, charge‐transfer type emitters, importantly, it opens the way for coplanar molecules to be efficient TADF emitters. Here, a new emitter, composed of azatriangulene and diphenyltriazine moieties, is theoretically designed, which is coplanar due to intramolecular H‐bonding interactions. The synthesis of this hexamethylazatriangulene‐triazine (HMAT‐TRZ) emitter and its preliminary photophysical characterizations point to HMAT‐TRZ as a potential efficient TADF emitter. 相似文献
67.
68.
Dr. Fumika Karaki Tomoya Oki Yuma Sakao Noriko Sato Dr. Shigeto Hirayama Dr. Kanako Miyano Prof. Yasuhito Uezono Prof. Hideaki Fujii 《ChemMedChem》2021,16(22):3463-3476
Ghrelin is a pleiotropic feeding hormone which also has a pivotal role in the central nervous system. Upon the activation of its receptor, growth hormone secretagogue receptor (GHSR), the Gαq/11-mediated and the β-arrestin-mediated signaling pathways are activated. As the β-arrestin pathway is a potential drug target, there is a strong need for β-arrestin-biased GHSR modulators. Activation of the β-arrestin pathway should inhibit the Gαq/11-mediated calcium flux through internalization of the receptor. Hence, we used the antagonistic activity in the calcium assay as the first screening for the β-arrestin activation. By conducting the second screening assay for the β-arrestin activation based on extracellular signal regulated kinase (ERK) 1/2 phosphorylation, we discovered a putative β-arrestin-biased superagonist. The activity of the compound was not completely blocked with the competitive antagonist, which implies that the effect is mediated, at least partly, by allosteric binding of the compound. 相似文献
69.
Dr. Yuma Ikeda Mariko Orioka Dr. Takahiro Nomoto Dr. Yuki Hiruta Prof. Nobuhiro Nishiyama Prof. Daniel Citterio 《Chembiochem : a European journal of chemical biology》2021,22(21):3067-3074
Replacing an N,N-dimethylamino group in a classical fluorophore with a four membered azetidine ring provides an improved luminescence quantum yield. Herein, we extended this strategy to bioluminescent firefly luciferin analogues and evaluated its general validity. For this purpose, four types of luciferin cores were employed, and a total of eight analogues were evaluated. Among these analogues, unexpectedly, only the benzothiazole core analogue benefited from an azetidine substitution and showed enhanced bioluminescence. In addition, fluorescence measurements revealed that an azetidine substitution improved the fluorescence quantum yield by 2.3-times compared to a N,N-dimethylamino group. These findings clarify the differential effects of azetidine substituents in luciferins and present one possible strategy for enhancing photon output in benzothiazole type luciferins through a synthetic approach. 相似文献
70.