Search Results 1-20 of 132

  • Ultrafast optical modulation of Dirac electrons in gated single-layer graphene

    Ikufumi Katayama , Kei-ichi Inoue , Yusuke Arashida , Yang Wu , Hyunsoo Yang , Taiki Inoue , Shohei Chiashi , Shigeo Maruyama , Tadaaki Nagao , Masahiro Kitajima , Jun Takeda

    … From the analysis of the pump-pulse-induced optical conductivity change, we find that the bias-induced blocking of the relaxation pathways and the pump-induced change of the electronic temperature and the Fermi level significantly contribute to the observed ultrafast optical modulation. …

    PHYSICAL REVIEW B 101(24), 245408-1-245408-6, 2020-06-05

    IR 

  • Future Directions of Therapeutic Vaccines for Chronic Diseases

    Nakamaru Ryo , Nakagami Hironori , Rakugi Hiromi , Morishita Ryuichi

    … Importantly, regarding the development of vaccines against self-antigens (i.e., angiotensin II), the vaccine should efficiently induce a blocking antibody response against the self-antigen without provoking cytotoxic T cells. … Therefore, to address the safety and efficiency of therapeutic vaccines, we have developed an original B-cell vaccine to induce antibody production and used carrier proteins, which include exogenous T-cell epitopes through the major histocompatibility complex. …

    Circulation Journal 84(11), 1895-1902, 2020

    J-STAGE 

  • Packet Processing Architecture with Off-Chip Last Level Cache Using Interleaved 3D-Stacked DRAM

    KORIKAWA Tomohiro , KAWABATA Akio , HE Fujun , OKI Eiji

    … Also, multiple types of applications and complex applications are executed in the same system simultaneously in carrier network systems, which require adequate cache memory capacities as well. … The evaluation results show that the proposed architecture reduces the memory access latency by 57 %, and increases the throughput by 100 % while reducing the blocking probability but about 10 % compared to the architecture with shared on-chip LLC. …

    IEICE Transactions on Communications, 2020

    J-STAGE 

  • Development of Long Lifetime and High Performance Organic Light Emitting Diode Display with Wide Temperature Range

    Mizusaki Masanobu , Shibasaki Masakazu , Tsukamoto Yuto , Umeda Tokiyoshi , Tsuchiya Hiroshi , Shimada Shinji

    … We clarified that charge-carrier balance between hole and electron inside the emission layer (EML) affects the lifetime of OLEDs, especially for blue-OLED. … A prototype 12.3 inch flexible OLED display was fabricated with using the new electron-blocking layer, hole-blocking layer, and hole-transport layer materials. …

    Journal of Photopolymer Science and Technology 33(4), 387-392, 2020

    J-STAGE 

  • Determination of Carrier Diffusion Length Using Transient Electron Photoemission Microscopy in the GaAs/InSe Heterojunction

    Emilio J. Juarez‐Perez , Yabing Qi

    … Carrier diffusion length and lifetime parameters for electron transport at nanoscale semiconductor slabs have been fitted using a 1D model and the decay data extracted from transient photoemission electron microscopy. … Meanwhile, a conventional photoluminescence quenching measurement needs two separate samples with an active material between blocking and quenching layers to characterize the carrier transport properties. …

    physica status solidi (b) 256(10), 1900126, 2019-05-20

    IR 

  • Electronic and Magnetic Phase Diagram of Mixed Anion Layered Compound Sr<sub>2</sub>CrFeAsO<sub>3−<i>δ</i></sub>

    Yamaguchi M. , Fujioka H. , Otsuka T. , Seto M. , Kitao S. , Matoba M. , Kamihara Y.

    … is composed by a carrier conducting FeAs layer and carrier blocking Sr<sub>2</sub>CrO<sub>3−<i>δ</i></sub> …

    Transaction of the Magnetics Society of Japan Special Issues 3(1), 28-33, 2019

    J-STAGE 

  • Bias-induced modulation of ultrafast carrier dynamics in metallic single-walled carbon nanotubes

    Maekawa Keisuke , Yanagi Kazuhiro , Minami Yasuo , Kitajima Masahiro , Katayama Ikufumi , Takeda Jun

    … Because optical dipole transitions between the Dirac bands are forbidden in MCNTs, the observed dynamics were attributed to carrier relaxation from the E11 band to the Dirac band. … Using a model that considers the suppression of electron-electron scattering (impact ionization) due to Pauli blocking, we could qualitatively explain the obtained bias dependence of the relaxation time. …

    Physical Review B 97(7), 075435-1-075435-6, 2018-02-22

    IR 

  • Fundermental Study on harmonics in a circulating current of a Modular Multilevel Converter (MMC) at 500Hz operation  [in Japanese]

    Takigawa Hirokazu , Tomioka Takuya , Okagaki Takuya , Ito Yoshimichi , Iyoda Isao

    … The effect of time step range and carrier frequency of PWM controller and harmonics suppression by the insertion of blocking filter are studied in this paper. …

    Journal of the Japan Institute of Power Electronics 44(0), 97-103, 2018

    J-STAGE 

  • Development of a Nano DDS for Cancer Immunotherapy Based on Llipid Nanoparticles  [in Japanese]

    Nakamura Takashi

    … Carrier type drug delivery systems based on nanobiotechnology (nano DDS) represent a potentially useful technology for efficiently achieving both: enhancement of the activity of immune cells and blocking immune suppression. …

    YAKUGAKU ZASSHI 138(12), 1443-1449, 2018

    J-STAGE  Ichushi Web 

  • Experimental and Numerical Simulation Analysis of the Blocking Layer in an Electromagnetic Induction-Controlled Automated Steel Teeming System

    Shi Chunyang , He Jicheng

    … <p>Improving the efficiency of electromagnetic steel teeming systems have included methods to accelerate the heating process, wherein the most convenient and effective is to adjust the position of the blocking layer. … Herein, numerical simulation is used to initially optimize the physical parameters (material type, shape and particle size) of the Fe-C alloy to identify the most effective induction heating area for the blocking layer. …

    MATERIALS TRANSACTIONS 59(1), 39-46, 2018

    J-STAGE 

  • Recombination Suppression in PbS Quantum Dot Heterojunction Solar Cells by Energy-Level Alignment in the Quantum Dot Active Layers

    Ding Chao , Zhang Yaohong , Liu Feng , Nakazawa Naoki , Huang Qingxun , Hayase Shuzi , Ogomi Yuhei , Toyoda Taro , Wang Ruixiang , Shen Qing

    … Using spatial energy-level gradient engineering with quantum dots (QDs) of different sizes to increase the generated carrier collection at the junction of a QD heterojunction solar cell (QDHSC) is a hopeful route for improving the energy-conversion efficiency. …

    ACS Applied Materials & Interfaces 10(31), 26142-26152, 2017-09-01

    IR 

  • Creation of High Performance Si-based Thermoelectric Conversion Material using Surface Coated Particles  [in Japanese]

    KATSUYAMA Shigeru

    … 直接変換する熱電変換材料の高性能化には材料のゼーベック係数<i>S</i>および電気伝導率<i>σ</i>を大きく，熱伝導率<i>κ</i>を小さくする必要がある．その設計指針としてPBET（Phonon Blocking Electron Transmitting）的特性を示す材料の実現が提案されている．本研究では酸化亜鉛ZnO系熱電変換材料について，キャリアの変調ドープを行った粉末から成る複合焼結体を作製し，PBET的特性の実現によりその …

    Hosokawa Powder Technology Foundation ANNUAL REPORT 25(0), 42-47, 2017

    J-STAGE 

  • Optimization of Experimental Parameters for the Performance of Solid-state Dye-sensitized Solar Cells

    YAMAGUCHI Miki , NISIMURA Taisei , SOHN Woon Yong , SHEN Qing , KUWAHARA Shota , KATAYAMA Kenji

    … The effects of various sample parameters for solid-state dye sensitized solar cells were studied with carrier dynamics measurements and electrochemical measurements. … We studied the effect of the generally utilized materials and processing such as the blocking layer, titanium oxide thickness, surface treatment, and the selection of dyes and hole transfer materials. …

    Analytical Sciences 33(9), 1041-1046, 2017

    J-STAGE 

  • Promise and Challenges of High-Voltage SiC Bipolar Power Devices

    Kimoto Tsunenobu , Yamada Kyosuke , Niwa Hiroki , Suda Jun

    … Although various silicon carbide (SiC) power devices with very high blocking voltages over 10 kV have been demonstrated, basic issues associated with the device operation are still not well understood. … In this paper, the promise and limitations of high-voltage SiC bipolar devices are presented, taking account of the injection-level dependence of carrier lifetimes. …

    Energies 9(11), 2016-11-03

    IR 

  • Role of Nanoscale Precipitates for Enhancement of Thermoelectric Properties of Heavily P-Doped Si-Ge Alloys

    Yusufu Aikebaier , Kurosaki Ken , Miyazaki Yoshinobu , Ishimaru Manabu , Kosuga Atsuko , Ohishi Yuji , Muta Hiroaki , Yamanaka Shinsuke

    … Here, we experimentally demonstrate effective phonon blocking without carrier mobility deterioration in bulk Si-Ge alloys containing phosphorous-rich nanoscale precipitates connected coherently or semi-coherently with the matrix phase. …

    MATERIALS TRANSACTIONS 57(7), 1070-1075, 2016

    J-STAGE 

  • Blocking Effect for Carrier Transfer to Triiodide in Alkyl-Functionalized Dyes in Dye-Sensitized Solar Cell

    Omata Keita , Kuwahara Shota , Hosokawa Ryo , Nishimura Taisei , Shen Qing , Toyoda Taro , Katayama Kenji

    … A blocking effect on the approach of electron acceptors into a dye/TiO<sub>2</sub> …

    Bulletin of the Chemical Society of Japan 88(9), 1308-1313, 2015

    J-STAGE 

  • 1C11 RADIO COMMUNICATION NETWORK FOR TRAIN CONTROL OF SPARCS(Safety-Infrastructure)

    KURITA Akira

    … SPARCS (Simple-structure and high-Performance ATC by Radio Communication System) is a train control system based on radio technology independently developed by Nippon Signal Co., Ltd. The system allows movement blocking operation and single line bidirectional operation suitable for high density carrier transportation which is required in urban traffic lines. …

    The Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH 2015(0), _1C11-1_-_1C11-6_, 2015

    J-STAGE 

  • The effects of polarization charges to carrier transport in nitride-based LEDs  [in Japanese]

    KATSUNO Syouta , HAYASHI Kento , YASUDA Toshiki , IWAYA Motoaki , TAKEUCHI Tetsuya , KAMIYAMA Satoshi , AKASAKI Isamu , AMANO Hiroshi

    窒化物半導体LEDにおけるキャリアオーバーフローの一因として、ヘテロ界面に誘起する分極電荷の影響が報告されている。本報告では、この分極電荷によるキャリア輸送への影響を検証し、その影響を抑制するために、バリア層/電子ブロック層界面に誘起する正の分極電荷の補償を試みた。シミュレーションにより、分極電荷によるキャリア輸送への影響を検証した結果、p層内に存在する正の分極電荷は、イオン化アクセプタだけが補償 …

    Technical report of IEICE. SDM 114(58), 75-80, 2014-05-28

  • The effects of polarization charges to carrier transport in nitride-based LEDs  [in Japanese]

    KATSUNO Syouta , HAYASHI Kento , YASUDA Toshiki , IWAYA Motoaki , TAKEUCHI Tetsuya , KAMIYAMA Satoshi , AKASAKI Isamu , AMANO Hiroshi

    窒化物半導体LEDにおけるキャリアオーバーフローの一因として、ヘテロ界面に誘起する分極電荷の影響が報告されている。本報告では、この分極電荷によるキャリア輸送への影響を検証し、その影響を抑制するために、バリア層/電子ブロック層界面に誘起する正の分極電荷の補償を試みた。シミュレーションにより、分極電荷によるキャリア輸送への影響を検証した結果、p層内に存在する正の分極電荷は、イオン化アクセプタだけが補償 …

    IEICE technical report. Electron devices 114(56), 75-80, 2014-05-28

  • The effects of polarization charges to carrier transport in nitride-based LEDs  [in Japanese]

    KATSUNO Syouta , HAYASHI Kento , YASUDA Toshiki , IWAYA Motoaki , TAKEUCHI Tetsuya , KAMIYAMA Satoshi , AKASAKI Isamu , AMANO Hiroshi

    窒化物半導体LEDにおけるキャリアオーバーフローの一因として、ヘテロ界面に誘起する分極電荷の影響が報告されている。本報告では、この分極電荷によるキャリア輸送への影響を検証し、その影響を抑制するために、バリア層/電子ブロック層界面に誘起する正の分極電荷の補償を試みた。シミュレーションにより、分極電荷によるキャリア輸送への影響を検証した結果、p層内に存在する正の分極電荷は、イオン化アクセプタだけが補償 …

    IEICE technical report. Component parts and materials 114(57), 75-80, 2014-05-28

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