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106 results on '"Fujii, Go"'

3. Toward Practical-Scale Quantum Annealing Machine for Prime Factoring

Author

Maezawa, Masaaki, Fujii, Go, Hidaka, Mutsuo, Imafuku, Kentaro, Kikuchi, Katsuya, Koike, Hanpei, Makise, Kazumasa, Nagasawa, Shuichi, Nakagawa, Hiroshi, Ukibe, Masahiro, and Kawabata, Shiro

Subjects
Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity, Physics - Applied Physics
Abstract

We propose a prime factorizer operated in a framework of quantum annealing (QA). The idea is inverse operation of a multiplier implemented with QA-based Boolean logic circuits. We designed the QA machine on an application-specific-annealing-computing architecture which efficiently increases available hardware budgets at the cost of restricted functionality. The invertible operation of QA logic gates consisting of superconducting flux qubits was confirmed by circuit simulation with classical noise sources. The circuits were implemented and fabricated by using superconducting integrated circuit technologies with Nb/AlOx/Nb Josephson junctions. We also propose a 2.5Dimensional packaging scheme of a qubit-chip/interpose /package-substrate structure for realizing practically large-scale QA systems., Comment: 17 pages, 11 figures

Published
2018
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4. Development FD-SOI MOSFET amplifiers for integrated read-out circuit of superconducting-tunnel-junction single-photon-detectors

Author

Kiuchi, Kenji, Kim, Shinhong, Takeuchi, Yuji, Takemasa, Kenichi, Nagata, Kazuki, Kasahara, Kota, Moriuchi, Koya, Senzaki, Ren, Yagi, Shunsuke, Ikeda, Hirokazu, Matsuura, Shuji, Wada, Takehiko, Ishino, Hirokazu, Kibayashi, Atsuko, Sato, Hiromi, Mima, Satoru, Yoshida, Takuo, Hirose, Ryuta, Kato, Yukihiro, Hazumi, Masasi, Arai, Yasuo, Kurachi, Ikuo, Ramgerg, Erik, Kozlovsky, Mark, Rubinov, Paul, Sergatskov, Dmitri, Kim, Soo-Bong, Shiki, Shigetomo, Ukibe, Masahiro, Fujii, Go, and Okubo, Masataka

Subjects
Physics - Instrumentation and Detectors
Abstract

We proposed a new high resolution single photon infrared spectrometer for search for radiative decay of cosmic neutrino background(C$\nu$B). The superconducting-tunnel-junctions(STJs) are used as a single photoncounting device. Each STJ consists of Nb/Al/Al${}_{\mathrm{x}}$O${}_{\mathrm{y}}$/Al/Nb layers and their thicknesses are optimized for the operation temperature at 370 mK cooled by a ${}^{3}$He sorption refrigerator. Our STJs achieved the leak current 250 pA and the measured data implies that a smaller area STJ fulfills our requirement. FD-SOI MOSFETs are employed to amplify the STJ signal current in order to increase signal-to-noise ratio(S/N). FD-SOI MOSFETs can be operated at cryogenic temperature of 370 mK, which reduces the noise of the signal amplification system. FD-SOI MOSFET characteristics are measured at cryogenic temperature. The Id-Vgs curve shows a sharper turn on with a higher threshold voltage and the Id-Vds curve shows a non linear shape in linear region at cryogenic temperature. Taking into account these effects, FD-SOI MOSFETs are available for read-out circuit of STJ detectors. The bias voltage for STJ detectors are 0.4 mV and it must be well stabilized to deliver high performance. We proposed an FD-SOI MOSFET based charge integrated amplifier design as a read-out circuit of STJ detectors. The requirements for an operational amplifier used in the amplifier is estimated using SPICE simulation. The op-amp required to have a fast response(GBW$\geq$100 MHz) and it must have low power dissipation as compared to the cooling power of refrigerator., Comment: Proceedings of International Workshop on SOI Pixel Detector (SOIPIX2015), Tohoku University, Sendai, Japan, 3-6, June, 2015. C15-06-03

Published
2015

7. Development of Superconducting Tunnel Junction Detector Using Hafnium for COBAND Experiment

Author

Takemasa, Kenichi, Kim, Shinhong, Takeuchi, Yuji, Nagata, Kazuki, Kasahara, Kota, Yagi, Shunsuke, Wakasa, Rena, Asano, Chisa, Ootuka, Youiti, Mima, Satoru, Kiuchi, Kenji, Arai, Yasuo, Kurachi, Ikuo, Hazumi, Masashi, Ishino, Hirokazu, Kibayashi, Atsuko, Yoshida, Takuo, Sakai, Makoto, Nakamura, Takahiro, Kato, Yukihiro, Matsuura, Shuji, Kawahito, Shoji, Ikeda, Hirokazu, Wada, Takehiko, Nagase, Koichi, Baba, Shunsuke, Shiki, Shigetomo, Ukibe, Masahiro, Fujii, Go, Ohkubo, Masataka, Ramberg, Erik, Kozlovsky, Mark, Rubinov, Paul, Yoo, Jonghee, Sergatskov, Domitri A., Kim, Soo-Bong, and Liu, Zhen-An, editor

Published
2018
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13. Lessons from 10 years of experiences after the Fukushima nuclear accident -From the dialogue between young victims and researchers

Author

Hirata, Shuzo, Kim, Jihye, Kamoshita, Matsuki, Fujii, Go, Kikuchi, Syota, Abe, Yurika, Sakurada, Koki, Harada, Kota, Kato, Yumi, Takamura, Yuzuna, Unuma, Hana, Koshinuma, Ami, Tanaka, Shodai, Tomitsuka, Yuri, Endo, Ryosuke, Kojima, Takaya, Masuda, Kazutaka, Katsuragawa, Taisuke, Kumano, Hiroaki, Hidaka, Tomoo, Ogihara, Atsushi, and Tsujiuchi, Takuya

Published
2022

14. 宇宙背景ニュートリノ崩壊探索COBAND実験

Author

RAMBERG, Erik, RUBINOV, Paul, SERGATSKOV, Dmitri, KIM, SooBong, KIM, Yong Hamb, LEE, Hyejin, KIM, Shin-Hong, TAKEUCHI, Yuji, IIDA, Takashi, ASANO, Chisa, WAKASA, Rena, YAMANE, Ryota, MORIYA, Yukihisa, KASHIWAGI, Ryuki, MATSUURA, Shuji, WADA, Takehiko, NAGASE, Koichi, YOSHIDA, Takuo, FURUYA, Takashi, NAKAYAMA, Kazuya, KIUCHI, Kenji, KATO, Yukihiro, ARAI, Yasuo, KURACHI, Ikuo, HAZUMI, Masashi, OHKUBO, Masataka, UKIBE, Masahiro, SHIKI, Shigetomo, FUJII, Go, ISHINO, Hirokazu, KIBAYASHI, Atsuko, KAWAHITO, Shoji, and MIMA, Satoru

Abstract

第5回観測ロケットシンポジウム(2023年2月28日-3月1日. オンライン開催), 5th Sounding Rocket Symposium(February 28-March 1, 2023. Online Meeting), 著者人数: 35名, 資料番号: SA6000185010, レポート番号: Ⅱ-1

Published
2023

22. Evaporation of Three-Dimensional Wavy Liquid Film Entrained by Turbulent Gas Flow

Author

Inoue, Takuya, Inoue, Chihiro, Fujii, Go, Daimon, Yu, Inoue, Takuya, Inoue, Chihiro, Fujii, Go, and Daimon, Yu

Abstract

A film cooling technique using a liquid film subjected to a hot gas flow in a turbulent condition is theoretically investigated. We successfully incorporate the two essential factors for the evaporating liquid film, droplet entrainment and three-dimensional film architecture, allowing for the physically-consistent straightforward formulation. The validity of the present model is convinced by reproducing combustion test results conducted for two types flightmodel bipropellant thrusters, in which the film length or dryout point shortens approximately inversely proportional to the combustion pressure. The underlying scenario to determine the film length is revealed. The gas flow initiates the originally smooth liquid film to be destabilized by Kelvin-Helmholtz instability in the axial direction and accelerates the wave crests leading to Rayleigh-Taylor instability in the transverse direction. Superposing the two types of waves produces three-dimensional cusps on the film as roots of entrained droplets. The convective heat transfer evaporating the liquid film is enhanced by the entrainment, reducing the net film flow rate, and by the cusp structure, enlarging the area of liquid/gas interface along the transverse direction in particular.

Published
2022

24. 宇宙背景ニュートリノ崩壊探索COBAND 実験

Author

ERIK, Ramberg, PAUL, Rubinov, DMITRI, Sergatskov, SOO-BONG, Kim, YONG-HAMB, Kim, HYEJIN, Lee, KIM, Shin-Hong, TAKEUCHI, Yuji, IIDA, Takashi, TAKEMASA, Kei-ichi, ASANO, Chisa, WAKASA, Rena, KASAJIMA, Akihiro, MAEKAWA, Gun, NAKAHARA, Saeko, YAMANE, Ryota, MORIYA, Yukihisa, KASHIWAGI, Ryuki, WADA, Takehiko, NAGASE, Koichi, MATSUURA, Shuji, YOSHIDA, Takuo, MIMA, Satoru, KIUCHI, Kenji, KATO, Yukihiro, ARAI, Yasuo, KURACHI, Ikuo, HAZUMI, Masashi, OHKUBO, Masataka, UKIBE, Masahiro, SHIKI, Shigetomo, FUJII, Go, ISHINO, Hirokazu, KIBAYASHI, Atsuko, and KAWAHITO, Shoji

Abstract

第4回観測ロケットシンポジウム（2022年3月14-15日. ハイブリッド開催（JAXA相模原キャンパス& オンライン）), 4th Sounding Rocket Symposium(March 14-15, 2022. Hybrid(in-person & online) Conference (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 著者人数: 39名, 資料番号: SA6000175009, レポート番号: Ⅱ-4

Published
2022

26. Modelling of Electrical Pump-Fed Propulsion Systems for Trade-Off Assessments

Author

GAISER, Nina, GERNOTH, Andreas, PERIGO, David, and FUJII, Go

Subjects
Engineering, Bipropellant, business.industry, Diaphragm, Mechanical engineering, MON-3, Diaphragm (mechanical device), PMD, MMH, Propulsion, business
Abstract

形態: カラー図版あり, Physical characteristics: Original contains color illustrations, Accepted: 2020-01-16, 資料番号: PA2010056000

Published
2020
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28. 宇宙背景ニュートリノ崩壊探索COBAND実験

Author

RAMBERG, Erik, RUBINOV, Paul, SERGATSKOV, Dmitri, KIM, Soo-Bong, KIM, Yong-Hamb, LEE, Hyejin, KIM, Shin-Hong, TAKEUCHI, Yuji, IIDA, Takashi, TAKEMASA, Kei-ichi, ASANO, Chisa, KASAJIMA, Akihiro, MAEKAWA, Gun, WADA, Takehiko, NAGASE, Koichi, MATSUURA, Shuji, YOSHIDA, Takuo, MIMA, Satoru, KIUCHI, Kenji, KATO, Yukihiro, ARAI, Yasuo, KURACHI, Ikuo, HAZUMI, Masashi, OKUBO, Masataka, UKIBE, Masahiro, SHIKI, Shigetomo, FUJII, Go, ISHINO, Hirokazu, KIBAYASHI, Atsuko, and KAWAHITO, Shoji

Abstract

第3回観測ロケットシンポジウム（2021年3月24-25日. オンライン開催), 3rd Sounding Rocket Symposium (March 24-25, 2021. Online Meeting), 著者人数: 36名PDF再処理の為、2023年3月17日に差替, 資料番号: SA6000162011, レポート番号: Ⅲ-4

Published
2021

36. 宇宙背景ニュートリノ崩壊探索 COBAND 実験

Author

Erik, Ramberg, Rubinov, Paul, Sergatskov, Dmitri, Soo-Bong, Kim, Kim, Yong-Hamb, Lee, Hyejin, Kim, Shin-Hong, Takeuchi, Yuji, Iida, Takashi, Takemasa, Ken-Ichi, Wakasa, Rena, Asano, Chisa, Kasajima, Akihiro, Ikeda, Hirokazu, Wada, Takehiko, Nagase, Koichi, Matsuura, Shuji, Yoshida, Takuo, Sakai, Makoto, Nakamura, Takahiro, Nishimura, Wataru, Mima, Satoru, Kiuchi, Kenji, Kato, Yukihiro, Arai, Yasuo, Kurachi, Ikuo, Hazumi, Masashi, Ohkubo, Masataka, Ukibe, Masahiro, Shiki, Shigetomo, Fujii, Go, Ishino, Hirokazu, Kibayashi, Atsuko, and Kawahito, Shoji

Abstract

第2回観測ロケットシンポジウム（2019年8月5日-6日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, 2nd Sounding Rocket Symposium (August 5-6, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 著者人数: 34名, 資料番号: SA6000142006, レポート番号: Ⅱ-1

Published
2019

42. 宇宙背景ニュートリノ崩壊探索COBAND実験

Author

Ramberg, Erik, Rubinov, Paul, Sergatskov, Dmitri, Kim, Soo-Bong, Kim, Shin-Hong, Takeuchi, Yuji, Takemasa, Ken-Ichi, Nagata, Kazuki, Yagi, Shunsuke, Wakasa, Rena, Asano, Chisa, Iida, Takashi, Kasajima, Akihiro, Ikeda, Hirokazu, Wada, Takehiko, Nagase, Koichi, Matsuura, Shuji, Yoshida, Takuo, Sakai, Makoto, Nakamura, Takahiro, Nishimura, Wataru, Mima, Satoru, Kiuchi, Kenji, Kato, Yukihiro, Arai, Yasuo, Kurachi, Ikuo, Hazumi, Masashi, Ohkubo, Masataka, Ukibe, Masahiro, Shiki, Shigetomo, Fujii, Go, Ishino, Hirokazu, Kibayashi, Atsuko, and Kawahito, Shoji

Abstract

第1回観測ロケットシンポジウム（2018年7月17日-18日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, 1st Sounding Rocket Symposium (July 17-18, 2018. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 著者人数: 34名, 資料番号: SA6000127012, レポート番号: Ⅳ-2

Published
2018

47. Degradation of Quality Factor of Superconducting Resonators by Remaining Metallic Film and Improved Fabrication Process Using Caldera Planarization

Author

Irimatsugawa, Tomoya, primary, Yamamori, Hirotake, additional, Hirayama, Fuminori, additional, Nagasawa, Shuichi, additional, Fujii, Go, additional, Kohjiro, Satoshi, additional, Sato, Akira, additional, Fukuda, Daiji, additional, Hidaka, Mutsuo, additional, Sato, Yasushi, additional, Ohno, Masashi, additional, and Takahashi, Hiroyuki, additional

Published
2019
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49. Toward Practical-Scale Quantum Annealing Machine for Prime Factoring

Author

Maezawa, Masaaki, primary, Fujii, Go, additional, Hidaka, Mutsuo, additional, Imafuku, Kentaro, additional, Kikuchi, Katsuya, additional, Koike, Hanpei, additional, Makise, Kazumasa, additional, Nagasawa, Shuichi, additional, Nakagawa, Hiroshi, additional, Ukibe, Masahiro, additional, and Kawabata, Shiro, additional

Published
2019
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