1,491 research outputs found
Letter from Sojiro Nishimura to Mr. S. Okine, November 26, 1946 [in Japanese]
No full textA letter from Sojiro Nishimura to his uncle, Seiichi Okine. He writes about his visit in the Okines' place in California and appreciation for their courtesy and generosity. He also notes that he has found the monetary gift of 15 dollars included in a gift from the Okines but would like to take only 5 dollars and return the rest to Seiichi.The Okine Collection contains materials collected by Seiichi and Tomeyo Okine who were Issei flower growers in Whittier, California. It includes correspondence, photographs, financial documents, and a photo album. A large portion of the collection consists of family correspondence with Seiichi and Tomeyo Okine, including letters from their Nisei children, Masao and Makoto Okine, both soldiers overseas during World War II, to their Issei parents incarcerated in the Rohwer incarceration camp in McGehee, Arkansas. The correspondence also includes letters from their relatives and friends who are former incarcerees in the camps during the war and have “resettled” in Chicago, Illinois as well as letters from the Okines’ family members in Hiroshima, Japan during the Allied occupation of Japan. In addition, the collection includes a family photo album compiled by Dorothy Ai Aoki, a Nisei daughter to the Okines
Letter from Shizuka Nishimura to Mr. and Mrs. S. Okine, October 30, [1947?] [in Japanese]
No full textA letter from Shizuka Nishimura in San Juan Bautista, California, to her uncle and aunt, Seiichi Okine. She thanks them for chrysanthemum flowers which they sent to her. She receives letters from her family members in Japan and learns that Fumiko Yamanaka is planning to return from Japan to the U.S. soon and that Jogi sent Fumiko money to prepare for the trip.The Okine Collection contains materials collected by Seiichi and Tomeyo Okine who were Issei flower growers in Whittier, California. It includes correspondence, photographs, financial documents, and a photo album. A large portion of the collection consists of family correspondence with Seiichi and Tomeyo Okine, including letters from their Nisei children, Masao and Makoto Okine, both soldiers overseas during World War II, to their Issei parents incarcerated in the Rohwer incarceration camp in McGehee, Arkansas. The correspondence also includes letters from their relatives and friends who are former incarcerees in the camps during the war and have “resettled” in Chicago, Illinois as well as letters from the Okines’ family members in Hiroshima, Japan during the Allied occupation of Japan. In addition, the collection includes a family photo album compiled by Dorothy Ai Aoki, a Nisei daughter to the Okines
Letter from Sojiro Nishimura to Mr. and Mrs. Okine, December 24, [1945] [in Japanese]
No full textA greeting letter from Munejiro Nishimura in Gardena, California to Seiichi and Tomeyo Okine in Hawthorne, California. In the letter, he thanks them for a Christmas gift and informs that he and his family has been staying in a house provided by a Caucasian friend who is supportive to the Japanese. The arrival date and place of the letter are recorded: December 22, 1945, Hawthorne.The Okine Collection contains materials collected by Seiichi and Tomeyo Okine who were Issei flower growers in Whittier, California. It includes correspondence, photographs, financial documents, and a photo album. A large portion of the collection consists of family correspondence with Seiichi and Tomeyo Okine, including letters from their Nisei children, Masao and Makoto Okine, both soldiers overseas during World War II, to their Issei parents incarcerated in the Rohwer incarceration camp in McGehee, Arkansas. The correspondence also includes letters from their relatives and friends who are former incarcerees in the camps during the war and have “resettled” in Chicago, Illinois as well as letters from the Okines’ family members in Hiroshima, Japan during the Allied occupation of Japan. In addition, the collection includes a family photo album compiled by Dorothy Ai Aoki, a Nisei daughter to the Okines
Development of high precision timing counter based on plastic scintillator with SiPM readout
No full textHigh-time-resolution counters based on plastic scintillator with silicon photomultiplier (SiPM) readout have been developed for applications to high energy physics experiments for which relatively large-sized counters are required.We have studied counter sizes up to 120 × 40 × 5 mm3 with series connection of multiple SiPMs to increase the sensitive area and thus achieve better time resolution. A readout scheme with analog shaping and digital waveform analysis is optimized to achieve the highest time resolution. The timing performance is measured using electrons from a 90Sr radioactive source, comparing different scintillators, counter dimensions, and types of near-ultraviolet sensitive SiPMs. As a result, a resolution of σ = 42±2 ps at 1MeV energy deposition is obtained for counter size 60 × 30 × 5 mm3 with three SiPMs ( 3 × 3 mm2 each) at each end of the scintillator. The time resolution improves with the number of photons detected by the SiPMs. The SiPMs from Hamamatsu Photonics give the best time resolution because of their high photon detection efficiency in the near-ultraviolet region. Further improvement is possible by increasing the number of SiPMs attached to the scintillator
On the extremely low polarization in Comet C/2023 P1 (Nishimura)
No full textOn September 6 and 7 of 2023, we measured the degree of linear polarization of Comet C/2023 P1 (Nishimura) with the R filter. Our observations reveal an extremely low amplitude of positive polarization. Our modelling suggests Mg-rich silicate dust particles are the dominant species in the coma; whereas, an alternative explanation is that such low positive polarization in comets is attributed to the depolarizing effect of their gaseous emission. These two alternative explanations predict dramatically different polarimetric responses at small phase angle that can be discriminated in future polarimetric observations of Comet C/2023 P1 (Nishimura). © 2023 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.11Nscopu
The development and characterization of an all-purpose bolus for radiotherapy
No full text主査：石井 一成 教授
学内授与番号：医第1415号Kenji Nakamura, Hajime Monzen, Kazuki Kubo, Hiroyuki Kosaka, Takaaki Ito, Yusuke Sakai, Yuya Yanagi, Yasumasa Nishimura "The development and characterization of an allpurpose bolus for radiotherapy" Physics in Medicine & Biology, Vol.68, No.10, p.105007
DOI：10.1088/1361-6560/acc7e0 掲
The development and characterization of an all-purpose bolus for radiotherapy
No full text近畿大学Kindai University博士（医学）主査：石井 一成 教授
学内授与番号：医第1415号Kenji Nakamura, Hajime Monzen, Kazuki Kubo, Hiroyuki Kosaka, Takaaki Ito, Yusuke Sakai, Yuya Yanagi, Yasumasa Nishimura "The development and characterization of an allpurpose bolus for radiotherapy" Physics in Medicine & Biology, Vol.68, No.10, p.105007
DOI：10.1088/1361-6560/acc7e0 掲載doctoral thesi
AEROELASTIC INSTABILITY OF SQUARE PRISMATIC HIGH-RISE BUILDING
No full textTo consider aeroelastic instabilities of prismatic high-rise buildings in strong winds, I. E., vortex induced oscillation or galloping, unsteady aerodynamic forces must be investigated as the external forces acting on building. From this point of view, wind tunnel experiments were performed to obtain information of the fluctuating pressure on side face of buildings, which are subjected to the forced harmonic oscillation with a fundamental linear mode in a boundary layer. This paper presents the characteristics of fluctuating pressures on the side face of the oscillating square prism. The phase angle between fluctuating pressure and the displacement of the prism appeared positive value near the resonant velocity. The total work done by unsteady aerodynamic pressures suddenly jumped up from negative to positive near the resonant velocity. Mainly, the pressure on the lower part of building contribute to the immediate change of the work.To consider aeroelastic instabilities of prismatic high-rise buildings in strong winds, I. E., vortex induced oscillation or galloping, unsteady aerodynamic forces must be investigated as the external forces acting on building. From this point of view, wind tunnel experiments were performed to obtain information of the fluctuating pressure on side face of buildings, which are subjected to the forced harmonic oscillation with a fundamental linear mode in a boundary layer. This paper presents the characteristics of fluctuating pressures on the side face of the oscillating square prism. The phase angle between fluctuating pressure and the displacement of the prism appeared positive value near the resonant velocity. The total work done by unsteady aerodynamic pressures suddenly jumped up from negative to positive near the resonant velocity. Mainly, the pressure on the lower part of building contribute to the immediate change of the work
UNSTEADY AERODYNAMIC PRESSURE ON RECTANGULAR HIGH-RISE BUILDING
No full textTo consider aeroelastic instabilities of prismatic high-rise buildings in strong winds, I.e., vortex induced oscillation or galloping, unsteady aerodynamic forces must be investigated as the external forces acting on building. From this point of view, wind tunnel experiments were performed to obtain information of the fluctuating pressure on side face of buildings, which are subjected to the forced harmonic oscillation with a fundamental linear mode in a boundary layer. In the previous paper we presented about the case of the oscillating square prism. This paper presents the characteristics of fluctuating pressures of other two type rectangular prisms. One type prism has the depth-breadth ratio equal to 2 which is the model of flow reattachment. Other type prism has the depth-breadth ratio equal to 0.5 which is the model of perfect separation. And the comparison of 3type prism (spuare and 2type rectangular prism) is discribed.To consider aeroelastic instabilities of prismatic high-rise buildings in strong winds, I.e., vortex induced oscillation or galloping, unsteady aerodynamic forces must be investigated as the external forces acting on building. From this point of view, wind tunnel experiments were performed to obtain information of the fluctuating pressure on side face of buildings, which are subjected to the forced harmonic oscillation with a fundamental linear mode in a boundary layer. In the previous paper we presented about the case of the oscillating square prism. This paper presents the characteristics of fluctuating pressures of other two type rectangular prisms. One type prism has the depth-breadth ratio equal to 2 which is the model of flow reattachment. Other type prism has the depth-breadth ratio equal to 0.5 which is the model of perfect separation. And the comparison of 3type prism (spuare and 2type rectangular prism) is discribed
Pixelated positron timing counter with SiPM-readout scintillator for MEG II experiment
No full textIn this paper, we introduce the positron timing counter (TC) for the MEG II experiment as an application of Silicon PhotoMultipliers (SiPM) to high-resolution timing measurement. MEG II will search for the μ → eγ decay and needs a precise measurement of the positron timing. The TC is segmented in 512 counters, composed of a scintillator plate readout by SiPMs, to obtain multiple hit positron timing simultaneously such to achieve an excellent overall timing resolution of ∼30 ps. We performed single counter R&D to optimize the choice of the SiPM manufacturer, the number of the SiPMs, and their connection. To obtain the best resolution, we decided to employ AdvanSiD SiPMs, six of which are attached at both ends connected in series. Moreover we carried out beam tests with 8-9 counters prototypes, where we proved that positron multiple hits improve the resolution according to expectation. The desgin phase of the TC is almost finished and is under construction
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