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551 results on '"Kamada S"'

1. A Remote-operated System to Map Radiation Dose in the Fukushima Daiichi Primary Containment Vessel

Author

Nancekievill M., Jones A. R., Joyce M. J., Lennox B., Watson S., Katakura J., Okumura K., Kamada S., Katoh M., and Nishimura K.

Subjects
Fukushima Daiichi, Gamma-ray detection, Radiation monitoring, Nuclear Decommissioning, Physics, QC1-999
Abstract

This paper describes the development of a submersible system based on a remote-operated vehicle coupled with radiation detectors to map the interior of the reactors at the Fukushima Daiichi nuclear power station. It has the aim oflocating fuel debris. The AVEXIS submersible vehicle used in this study has been designed as a low-cost, potentially disposable, inspection platform that is the smallest of its class and is capable of being deployed through a 150 mm diameter access pipe. To map the gamma-ray environment, a cerium bromide scintillator detector with a small form factor has been incorporated into the AVEXIS to identify radioactive isotopes via gamma-ray spectroscopy. This provides the combined system with the potential to map gamma-ray spectra and particle locations throughout submerged, contaminated facilities, such as Units 1, 2 and 3 of the Fukushima Daiichi nuclear power plant. The hypothesis of this research is to determine the sensitivity of the combined system in a submerged environment that replicates the combination of gamma radiation and water submersion but at lower dose rates.

Published
2018
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2. An unknotting index for virtual knots

Author

Kaur, K., Kamada, S., Kawauchi, A., and Prabhakar, M.

Subjects
Mathematics - Geometric Topology, 57M25 (Primary), 57M27 (Secondary)
Abstract

In this paper we introduce the notion of an unknotting index for virtual knots. We give some examples of computation by using writhe invariants, and discuss a relationship between the unknotting index and the virtual knot module. In particular, we show that for any non-negative integer $n$ there exists a virtual knot whose unknotting index is $(1,n)$.

Published
2017

4. Self-shielding effect of a single phase liquid xenon detector for direct dark matter search

Author

Minamino, A., Abe, K., Ashie, Y., Hosaka, J., Ishihara, K., Kobayashi, K., Koshio, Y., Mitsuda, C., Moriyama, S., Nakahata, M., Nakajima, Y., Namba, T., Ogawa, H., Sekiya, H., Shiozawa, M., Suzuki, Y., Takeda, A., Takeuchi, Y., Taki, K., Ueshima, K., Ebizuka, Y., Ota, A., Suzuki, S., Hagiwara, H., Hashimoto, Y., Kamada, S., Kikuchi, M., Kobayashi, N., Nagase, T., Nakamura, S., Tomita, K., Uchida, Y., Fukuda, Y., Sato, T., Nishijima, K., Maruyama, T., Motoki, D., Itow, Y., Kim, Y. D., Lee, J. I., Moon, S. H., Lim, K. E., Cravens, J. P, and Smy, M. B.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Liquid xenon is a suitable material for a dark matter search. For future large scale experiments, single phase detectors are attractive due to their simple configuration and scalability. However, in order to reduce backgrounds, they need to fully rely on liquid xenon's self-shielding property. A prototype detector was developed at Kamioka Observatory to establish vertex and energy reconstruction methods and to demonstrate the self-shielding power against gamma rays from outside of the detector. Sufficient self-shielding power for future experiments was obtained., Comment: 8 pages, 8 figures

Published
2009
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5. Compensation of the Crossing Angle with Crab Cavities at KEKB

Author

Abe, T., Akai, K., Akemoto, M., Akiyama, A., Arinaga, M., Ebihara, K., Egawa, K., Enomoto, A., Flanagan, J., Fukuda, S., Fukuma, H., Funakoshi, Y., Furukawa, K., Furuya, T., Hara, K., Higo, T., Hiramatsu, S., Hisamatsu, H., Honma, H., Honma, T., Hosoyama, K., Ieiri, T., Iida, N., Ikeda, H., Ikeda, M., Inagaki, S., Isagawa, S., Ishii, H., Kabe, A., Kadokura, E., Kageyama, T., Kakihara, K., Kako, E., Kamada, S., Kamitani, T., Kanazawa, K., Katagiri, H., Kato, S., Kawamoto, T., Kazakov, S., Kikuchi, M., Kikutani, E., Kitagawa, K., Koiso, H., Kojima, Y., Komada, I., Kubo, T., Kudo, K., Kudo, N., Marutsuka, K., Masuzawa, M., Matsumoto, S., Matsumoto, T., Michizono, S., Mikawa, K., Mimashi, T., Mitsunobu, S., Mori, K., Morita, A., Morita, Y., Nakai, H., Nakajima, H., Nakamura, T. T., Nakanishi, H., Nakanishi, K., Nakao, K., Ninomiya, S., Ogawa, Y., Ohmi, K., Ohsawa, S., Ohsawa, Y., Ohnishi, Y., Ohuchi, N., Oide, K., Ono, M., Ozaki, T., Saito, K., Sakai, H., Sakamoto, Y., Sato, M., Satoh, M., Shibata, K., Shidara, T., Shirai, M., Shirakawa, A., Sueno, T., Suetake, M., Suetsugu, Y., Sugahara, R., Sugimura, T., Suwada, T., Tajima, O., Takano, S., Takasaki, S., Takenaka, T., Takeuchi, Y., Tawada, M., Tejima, M., Tobiyama, M., Tokuda, N., Uehara, S., Uno, S., Yamamoto, Y., Yano, Y., Yokoyama, K., Yoshida, Ma., Yoshida, Mi., Yoshimoto, S., Yoshino, K., KEK, Oho, Tsukuba, Perevedentsev, E., Shatilov, D. N., and BINP

Subjects
Physics - Instrumentation and Detectors
Abstract

Crab cavities have been installed in the KEKB B--Factory rings to compensate the crossing angle at the collision point and thus increase luminosity. The beam operation with crab crossing has been done since February 2007. This is the first experience with such cavities in colliders or storage rings. The crab cavities have been working without serious issues. While higher specific luminosity than the geometrical gain has been achieved, further study is necessary and under way to reach the prediction of simulation., Comment: Submitted to Particle Accelerator Conference 2007, MOZAKI01, Albuquerque

Published
2007

6. Studies of uniformity of 50 [formula omitted]m low-gain avalanche detectors at the Fermilab test beam

Author

Apresyan, A., Xie, S., Pena, C., Arcidiacono, R., Cartiglia, N., Carulla, M., Derylo, G., Ferrero, M., Flores, D., Freeman, P., Galloway, Z., Ghassemi, A., Al Ghoul, H., Gray, L., Hidalgo, S., Kamada, S., Los, S., Mandurrino, M., Merlos, A., Minafra, N., Pellegrini, G., Quirion, D., Ronzhin, A., Royon, C., Sadrozinski, H., Seiden, A., Sola, V., Spiropulu, M., Staiano, A., Uplegger, L., Yamamoto, K., and Yamamura, K.

Published
2018
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10. Study of the beam-beam limit in e+e- circular colliders

Author

Ohmi, K., Tawada, M., Cai, Y., Kamada, S., Oide, K., and Qiang, J.

Subjects
Particle accelerators, beam-beam limit electron circular colliders luminosity limit B factory
Abstract

Beam-beam effects limit the luminosity of circular colliders. Once the bunch population exceeds a threshold, the luminosity increases at a slower rate. This phenominon is called the beam-beam limit. Onset of the beam-beam limit has been analyzed with various simulation methods based on the weak-strong and strong-strong models. We have observed that an incoherent phenomenon is mainly concerned in the beam-beam limit. The simulation have shown that equilibrium distributions of the two colliding beams are distorted from Gaussians when the luminosity is limited. The beam-beam limit is estimated to be (xi)~; 0.1 for a B factory with dampint time of several thousand turns.

Published
2004

11. Study of the beam-beam limit in e{sup +}e{sup -} circular colliders

Author

Ohmi, K., Tawada, M., Cai, Y., Kamada, S., Oide, K., and Qiang, J.

Subjects
beam-beam limit electron circular colliders luminosity limit B factory
Abstract

Beam-beam effects limit the luminosity of circular colliders. Once the bunch population exceeds a threshold, the luminosity increases at a slower rate. This phenominon is called the beam-beam limit. Onset of the beam-beam limit has been analyzed with various simulation methods based on the weak-strong and strong-strong models. We have observed that an incoherent phenomenon is mainly concerned in the beam-beam limit. The simulation have shown that equilibrium distributions of the two colliding beams are distorted from Gaussians when the luminosity is limited. The beam-beam limit is estimated to be (xi)~ 0.1 for a B factory with dampint time of several thousand turns.

Published
2004

12. Embedded pitch adapters: A high-yield interconnection solution for strip sensors

Author

Ullán, M., Allport, P.P., Baca, M., Broughton, J., Chisholm, A., Nikolopoulos, K., Pyatt, S., Thomas, J.P., Wilson, J.A., Kierstead, J., Kuczewski, P., Lynn, D., Hommels, L.B.A., Fleta, C., Fernandez-Tejero, J., Quirion, D., Bloch, I., Díez, S., Gregor, I.M., Lohwasser, K., Poley, L., Tackmann, K., Hauser, M., Jakobs, K., Kuehn, S., Mahboubi, K., Mori, R., Parzefall, U., Clark, A., Ferrere, D., Gonzalez Sevilla, S., Ashby, J., Blue, A., Bates, R., Buttar, C., Doherty, F., McMullen, T., McEwan, F., O'Shea, V., Kamada, S., Yamamura, K., Ikegami, Y., Nakamura, K., Takubo, Y., Unno, Y., Takashima, R., Chilingarov, A., Fox, H., Affolder, A.A., Casse, G., Dervan, P., Forshaw, D., Greenall, A., Wonsak, S., Wormald, M., Cindro, V., Kramberger, G., Mandić, I., Mikuž, M., Gorelov, I., Hoeferkamp, M., Palni, P., Seidel, S., Taylor, A., Toms, K., Wang, R., Hessey, N.P., Valencic, N., Hanagaki, K., Dolezal, Z., Kodys, P., Bohm, J., Mikestikova, M., Bevan, A., Beck, G., Milke, C., Domingo, M., Fadeyev, V., Galloway, Z., Hibbard-Lubow, D., Liang, Z., Sadrozinski, H.F.-W., Seiden, A., To, K., French, R., Hodgson, P., Marin-Reyes, H., Parker, K., Jinnouchi, O., Hara, K., Bernabeu, J., Civera, J.V., Garcia, C., Lacasta, C., Marti i Garcia, S., Rodriguez, D., Santoyo, D., Solaz, C., and Soldevila, U.

Published
2016
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13. Evaluation of the performance of irradiated silicon strip sensors for the forward detector of the ATLAS Inner Tracker Upgrade

Author

Mori, R., Allport, P.P., Baca, M., Broughton, J., Chisholm, A., Nikolopoulos, K., Pyatt, S., Thomas, J.P., Wilson, J.A., Kierstead, J., Kuczewski, P., Lynn, D., Arratia-Munoz, M.I., Hommels, L.B.A., Ullan, M., Fleta, C., Fernandez-Tejero, J., Bloch, I., Gregor, I.M., Lohwasser, K., Poley, L., Tackmann, K., Trofimov, A., Yildirim, E., Hauser, M., Jakobs, K., Kuehn, S., Mahboubi, K., Parzefall, U., Clark, A., Ferrere, D., Sevilla, S. Gonzalez, Ashby, J., Blue, A., Bates, R., Buttar, C., Doherty, F., McMullen, T., McEwan, F., O'Shea, V., Kamada, S., Yamamura, K., Ikegami, Y., Nakamura, K., Takubo, Y., Unno, Y., Takashima, R., Chilingarov, A., Fox, H., Affolder, A.A., Casse, G., Dervan, P., Forshaw, D., Greenall, A., Wonsak, S., Wormald, M., Cindro, V., Kramberger, G., Mandić, I., Mikuž, M., Gorelov, I., Hoeferkamp, M., Palni, P., Seidel, S., Taylor, A., Toms, K., Wang, R., Hessey, N.P., Valencic, N., Hanagaki, K., Dolezal, Z., Kodys, P., Bohm, J., Stastny, J., Mikestikova, M., Bevan, A., Beck, G., Milke, C., Domingo, M., Fadeyev, V., Galloway, Z., Hibbard-Lubow, D., Liang, Z., Sadrozinski, H.F.-W., Seiden, A., To, K., French, R., Hodgson, P., Marin-Reyes, H., Parker, K., Jinnouchi, O., Hara, K., Sato, K., Hagihara, M., Iwabuchi, S., Bernabeu, J., Civera, J.V., Garcia, C., Lacasta, C., Garcia, S. Marti i, Rodriguez, D., Santoyo, D., Solaz, C., and Soldevila, U.

Published
2016
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14. Charge collection and field profile studies of heavily irradiated strip sensors for the ATLAS inner tracker upgrade

Author

Hara, K., Allport, P.P., Baca, M., Broughton, J., Chisholm, A., Nikolopoulos, K., Pyatt, S., Thomas, J.P., Wilson, J.A., Kierstead, J., Kuczewski, P., Lynn, D., Arratia, M., Hommels, L.B.A., Ullan, M., Bloch, I., Gregor, I.M., Tackmann, K., Trofimov, A., Yildirim, E., Hauser, M., Jakobs, K., Kuehn, S., Mahboubi, K., Mori, R., Parzefall, U., Clark, A., Ferrere, D., Gonzalez Sevilla, S., Ashby, J., Blue, A., Bates, R., Buttar, C., Doherty, F., McMullen, T., McEwan, F., O'Shea, V., Kamada, S., Yamamura, K., Ikegami, Y., Nakamura, K., Takubo, Y., Unno, Y., Takashima, R., Chilingarov, A., Fox, H., Affolder, A.A., Casse, G., Dervan, P., Forshaw, D., Greenall, A., Wonsak, S., Wormald, M., Cindro, V., Kramberger, G., Mandić, I., Mikuž, M., Gorelov, I., Hoeferkamp, M., Palni, P., Seidel, S., Taylor, A., Toms, K., Wang, R., Hessey, N.P., Valencic, N., Hanagaki, K., Dolezal, Z., Kodys, P., Bohm, J., Mikestikova, M., Bevan, A., Beck, G., Milke, C., Domingo, M., Fadeyev, V., Galloway, Z., Hibbard-Lubow, D., Liang, Z., Sadrozinski, H.F.-W., Seiden, A., To, K., French, R., Hodgson, P., Marin-Reyes, H., Parker, K., Jinnouchi, O., Sato, K., Hagihara, M., Iwabuchi, S., Bernabeu, J., Civera, J.V., Garcia, C., Lacasta, C., Marti i. Garcia, S., Rodriguez, D., Santoyo, D., Solaz, C., and Soldevila, U.

Published
2016
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15. Development of n+-in-p planar pixel sensors for extremely high radiation environments, designed to retain high efficiency after irradiation

Author

Unno, Y., Kamada, S., Yamamura, K., Ikegami, Y., Nakamura, K., Takubo, Y., Takashima, R., Tojo, J., Kono, T., Hanagaki, K., Yajima, K., Yamauchi, Y., Hirose, M., Homma, Y., Jinnouchi, O., Kimura, K., Motohashi, K., Sato, S., Sawai, H., Todome, K., Yamaguchi, D., Hara, K., Sato, Kz., Sato, Kj., Hagihara, M., and Iwabuchi, S.

Published
2016
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16. Test beam evaluation of newly developed n-in-p planar pixel sensors for use in a high radiation environment

Author

Kimura, K., Yamaguchi, D., Motohashi, K., Nakamura, K., Unno, Y., Jinnouchi, O., Altenheiner, S., Blue, A., Bomben, M., Butter, A., Cervelli, A., Crawley, S., Ducourthial, A., Gisen, A., Hagihara, M., Hanagaki, K., Hara, K., Hirose, M., Homma, Y., Ikegami, Y., Kamada, S., Kono, T., Macchiolo, A., Marchiori, G., Meloni, F., Milovanovic, M., Morton, A., Mullier, G., Munoz, F.J., Nellist, C., Paschen, B., Quadt, A., Rashid, T., Rieger, J., Rummler, A., Sato, K., Savic, N., Sawai, H., Sexton, K., Stramaglia, M.E., Swiatlowski, M., Takashima, R., Takubo, Y., Terzo, S., Todome, K., Tojo, J., Houten, K. Van, Weingarten, J., Wonsak, S., Wraight, K., and Yamamura, K.

Published
2016
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17. Detailed studies of full-size ATLAS12 sensors

Author

Hommels, L.B.A., Allport, P.P., Baca, M., Broughton, J., Chisholm, A., Nikolopoulos, K., Pyatt, S., Thomas, J.P., Wilson, J.A., Kierstead, J., Kuczewski, P., Lynn, D., Arratia, M., Klein, C.T., Ullan, M., Fleta, C., Fernandez-Tejero, J., Bloch, I., Gregor, I.M., Lohwasser, K., Poley, L., Tackmann, K., Trofimov, A., Yildirim, E., Hauser, M., Jakobs, K., Kuehn, S., Mahboubi, K., Mori, R., Parzefall, U., Clark, A., Ferrere, D., Gonzalez Sevilla, S., Ashby, J., Blue, A., Bates, R., Buttar, C., Doherty, F., McMullen, T., McEwan, F., O׳Shea, V., Kamada, S., Yamamura, K., Ikegami, Y., Nakamura, K., Takubo, Y., Unno, Y., Takashima, R., Chilingarov, A., Fox, H., Affolder, A.A., Casse, G., Dervan, P., Forshaw, D., Greenall, A., Wonsak, S., Wormald, M., Cindro, V., Kramberger, G., Mandić, I., Mikuž, M., Gorelov, I., Hoeferkamp, M., Palni, P., Seidel, S., Taylor, A., Toms, K., Wang, R., Hessey, N.P., Valencic, N., Hanagaki, K., Dolezal, Z., Kodys, P., Bohm, J., Stastny, J., Mikestikova, M., Bevan, A., Beck, G., Milke, C., Domingo, M., Fadeyev, V., Galloway, Z., Hibbard-Lubow, D., Liang, Z., Sadrozinski, H.F.-W., Seiden, A., To, K., French, R., Hodgson, P., Marin-Reyes, H., Parker, K., Jinnouchi, O., Hara, K., Sato, K., Hagihara, M., Iwabuchi, S., Bernabeu, J., Civera, J.V., Garcia, C., Lacasta, C., Marti i Garcia, S., Rodriguez, D., Santoyo, D., Solaz, C., and Soldevila, U.

Published
2016
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18. Study of surface properties of ATLAS12 strip sensors and their radiation resistance

Author

Mikestikova, M., Allport, P.P., Baca, M., Broughton, J., Chisholm, A., Nikolopoulos, K., Pyatt, S., Thomas, J.P., Wilson, J.A., Kierstead, J., Kuczewski, P., Lynn, D., Hommels, L.B.A., Ullan, M., Bloch, I., Gregor, I.M., Tackmann, K., Hauser, M., Jakobs, K., Kuehn, S., Mahboubi, K., Mori, R., Parzefall, U., Clark, A., Ferrere, D., Sevilla, S. Gonzalez, Ashby, J., Blue, A., Bates, R., Buttar, C., Doherty, F., McMullen, T., McEwan, F., O’Shea, V., Kamada, S., Yamamura, K., Ikegami, Y., Nakamura, K., Takubo, Y., Unno, Y., Takashima, R., Chilingarov, A., Fox, H., Affolder, A.A., Casse, G., Dervan, P., Forshaw, D., Greenall, A., Wonsak, S., Wormald, M., Cindro, V., Kramberger, G., Mandić, I., Mikuž, M., Gorelov, I., Hoeferkamp, M., Palni, P., Seidel, S., Taylor, A., Toms, K., Wang, R., Hessey, N.P., Valencic, N., Hanagaki, K., Dolezal, Z., Kodys, P., Bohm, J., Stastny, J., Bevan, A., Beck, G., Milke, C., Domingo, M., Fadeyev, V., Galloway, Z., Hibbard-Lubow, D., Liang, Z., Sadrozinski, H.F.-W., Seiden, A., To, K., French, R., Hodgson, P., Marin-Reyes, H., Parker, K., Jinnouchi, O., Hara, K., Sato, K., Hagihara, M., Iwabuchi, S., Bernabeu, J., Civera, J.V., Garcia, C., Lacasta, C., Marti i Garcia, S., Rodriguez, D., Santoyo, D., Solaz, C., and Soldevila, U.

Published
2016
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20. Development of n+-in-p large-area silicon microstrip sensors for very high radiation environments – ATLAS12 design and initial results

Author

Unno, Y., Edwards, S.O., Pyatt, S., Thomas, J.P., Wilson, J.A., Kierstead, J., Lynn, D., Carter, J.R., Hommels, L.B.A., Robinson, D., Bloch, I., Gregor, I.M., Tackmann, K., Betancourt, C., Jakobs, K., Kuehn, S., Mori, R., Parzefall, U., Wiik-Fucks, L., Clark, A., Ferrere, D., Gonzalez Sevilla, S., Ashby, J., Blue, A., Bates, R., Buttar, C., Doherty, F., Eklund, L., McMullen, T., McEwan, F., O׳Shea, V., Kamada, S., Yamamura, K., Ikegami, Y., Nakamura, K., Takubo, Y., Nishimura, R., Takashima, R., Chilingarov, A., Fox, H., Affolder, A.A., Allport, P.P., Casse, G., Dervan, P., Forshaw, D., Greenall, A., Wonsak, S., Wormald, M., Cindro, V., Kramberger, G., Mandic, I., Mikuz, M., Gorelov, I., Hoeferkamp, M., Palni, P., Seidel, S., Taylor, A., Toms, K., Wang, R., Hessey, N.P., Valencic, N., Arai, Y., Hanagaki, K., Dolezal, Z., Kodys, P., Bohm, J., Mikestikova, M., Bevan, A., Beck, G., Ely, S., Fadeyev, V., Galloway, Z., Grillo, A.A., Martinez-McKinney, F., Ngo, J., Parker, C., Sadrozinski, H.F.-W., Schumacher, D., Seiden, A., French, R., Hodgson, P., Marin-Reyes, H., Parker, K., Paganis, S., Jinnouchi, O., Motohashi, K., Todome, K., Yamaguchi, D., Hara, K., Hagihara, M., Garcia, C., Jimenez, J., Lacasta, C., Marti i Garcia, S., and Soldevila, U.

Published
2014
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21. Self-shielding effect of a single phase liquid xenon detector for direct dark matter search

Author

Minamino, A., Abe, K., Ashie, Y., Hosaka, J., Ishihara, K., Kobayashi, K., Koshio, Y., Mitsuda, C., Moriyama, S., Nakahata, M., Nakajima, Y., Namba, T., Ogawa, H., Sekiya, H., Shiozawa, M., Suzuki, Y., Takeda, A., Takeuchi, Y., Taki, K., Ueshima, K., Ebizuka, Y., Ota, A., Suzuki, S., Hagiwara, H., Hashimoto, Y., Kamada, S., Kikuchi, M., Kobayashi, N., Nagase, T., Nakamura, S., Tomita, K., Uchida, Y., Fukuda, Y., Sato, T., Nishijima, K., Maruyama, T., Motoki, D., Itow, Y., Kim, Y.D., Lee, J.I., Moon, S.H., Lim, K.E., Cravens, J.P., and Smy, M.B.

Published
2012
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25. Development of n-on-p silicon sensors for very high radiation environments

Author

Unno, Y., Affolder, A.A., Allport, P.P., Bates, R., Betancourt, C., Bohm, J., Brown, H., Buttar, C., Carter, J.R., Casse, G., Chen, H., Chilingarov, A., Cindro, V., Clark, A., Dawson, N., DeWilde, B., Dolezal, Z., Eklund, L., Fadeyev, V., Ferrere, D., Fox, H., French, R., Garcia, C., Gerling, M., Gonzalez Sevilla, S., Gorelov, I., Greenall, A., Grillo, A.A., Hamasaki, N., Hara, K., Hatano, H., Hoeferkamp, M., Hommels, L.B.A., Ikegami, Y., Jakobs, K., Kamada, S., Kierstead, J., Kodys, P., Kohler, M., Kohriki, T., Kramberger, G., Lacasta, C., Li, Z., Lindgren, S., Lynn, D., Mikestikova, M., Maddock, P., Mandic, I., Marti i Garcia, S., Martinez-McKinney, F., Maunu, R., McCarthy, R., Metcalfe, J., Mikuz, M., Minano, M., Mitsui, S., O'Shea, V., Paganis, S., Parzefall, U., Puldon, D., Robinson, D., Sadrozinski, H.F.-W., Sattari, S., Schamberger, D., Seidel, S., Seiden, A., Terada, S., Toms, K., Tsionou, D., Von Wilpert, J., Wormald, M., Wright, J., Yamada, M., and Yamamura, K.

Published
2011
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35. Cross-cultural prevalence of sleep quality and psychological distress in healthcare workers during COVID-19 pandemic

Author

Khan, H. R., Ashraf, F., Ullah, I., Tahir, M. J., Dominari, A., Shoib, S., Naeem, H., Reddy, G., Mukherjee, P., Akram, I., Kamada, S., Memon, R. R., Khan, M. M. Y., Raut, S., Shalaby, M. M. M., Anwar, R. U., Farooq, M., Soparia, K. K., Ramalho, R., Lin, C. -Y, Pakpour, Amir H., Khan, H. R., Ashraf, F., Ullah, I., Tahir, M. J., Dominari, A., Shoib, S., Naeem, H., Reddy, G., Mukherjee, P., Akram, I., Kamada, S., Memon, R. R., Khan, M. M. Y., Raut, S., Shalaby, M. M. M., Anwar, R. U., Farooq, M., Soparia, K. K., Ramalho, R., Lin, C. -Y, and Pakpour, Amir H.

Abstract

Background: Poor quality sleep and emotional disturbances are expected in times of crisis. COVID-19 has severely impacted healthcare worldwide and with that comes the concern about its effects on healthcare workers. The purpose of the present study was to assess sleep quality and psychological distress in healthcare workers during the COVID-19 pandemic. Methods: The present work is a multi-centric cross-sectional study targeting healthcare workers from India, Pakistan, and Nepal. It used an online version of the Pittsburg Sleep Quality Index and the General Health Questionnaire, and data were analyzed using SPSS V.24. Results: A total of 1790 participants completed the questionnaire. Of the 1790 participants, 57% reported poor sleep quality, and 10% reported a high level of psychological distress. A cross-cultural comparison found some differences between the different groups of participants. The details of the differences were further explored in the article. Conclusion: The present study highlights that a significant proportion of healthcare workers are affected by poor sleep quality and psychological distress during the COVID-19 pandemic. It also emphasizes the imperative to provide them with psychosocial support to avoid potential short- and long-term psychological consequences of these troubling times.

Published
2021
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41. Detection of simulated fukushima daichii fuel debris using a remotely operated vehicle at the naraha test facility

Author

Nancekievill, M., Espinosa, J., Watson, S., Lennox, B., Jones, A., Joyce, M.J., Katakura, J.-I., Okumura, K., Kamada, S., Katoh, M., Nishimura, K., Nancekievill, M., Espinosa, J., Watson, S., Lennox, B., Jones, A., Joyce, M.J., Katakura, J.-I., Okumura, K., Kamada, S., Katoh, M., and Nishimura, K.

Abstract

The use of robotics in harsh environments, such as nuclear decommissioning, has increased in recent years. Environments such as the Fukushima Daiichi accident site from 2011 and the Sellafield legacy ponds highlight the need for robotic systems capable of deployment in hazardous environments unsafe for human workers. To characterise these environments, it is important to develop robust and accurate localization systems that can be combined with mapping techniques to create 3D reconstructions of the unknown environment. This paper describes the development and experimental verification of a localization system for an underwater robot, which enabled the collection of sonar data to create 3D images of submerged simulated fuel debris. The system was demonstrated at the Naraha test facility, Fukushima prefecture, Japan. Using a camera with a bird’s-eye view of the simulated primary containment vessel, the 3D position and attitude of the robot was obtained using coloured LED markers (active markers) on the robot, landmarks on the test-rig (passive markers), and a depth sensor on the robot. The successful reconstruction of a 3D image has been created through use of a robot operating system (ROS) node in real-time.

Published
2019

42. Effect of post-annealing on superconducting properties and microstructures of Bi(2212)/Ag tapes

Author

Nagata, A., Yamauchi, S., Kamada, S., Sugawara, K., Takahashi, C., Nagano, M., Wakiya, Y., and Hanada, S.

Subjects
Recrystallization (Metallurgy) -- Analysis, Superconductors -- Thermal properties, Business, Electronics, Electronics and electrical industries
Abstract

The influence of post-annealing procedures on the superconducting properties and microstructure of Bi(2212)/Ag tapes fabricated via the melt-growth method is studied at various cooling rates in air and Bi atmospheres. The tapes' critical current density, grain boundaries and critical temperature are measured during the experiments by scanning electron microscopy and a four-probe method. Results show that the post annealing improves the tapes' superconductivity, although it does not correct misoriented grains.

Published
1995

44. Commissioning of KEKB

Author

Akai, K., Akasaka, N., Enomoto, A., Flanagan, J., Fukuma, H., Funakoshi, Y., Furukawa, K., Furuya, T., Haba, J., Hiramatsu, S., Hosoyama, K., Ieiri, T., Iida, N., Ikeda, H., Kamada, S., Kamitani, T., Kato, S., Kikuchi, M., Kikutani, E., Koiso, H., Kurokawa, S., Masuzawa, M., Matsumoto, T., Mimashi, T., Mitsuhashi, T., Nakamura, T.T., Ogawa, Y., Ohmi, K., Ohnishi, Y., Ohsawa, S., Ohuchi, N., Oide, K., Perevedentsev, E., Satoh, K., Suetake, M., Suetsugu, Y., Suwada, T., Tawada, M., Tejima, M., Tobiyama, M., Uno, S., Wu, Y., Yamamoto, N., Yoshida, M., Yoshioka, M., Yoshimoto, S., and Zimmermann, F.

Published
2003
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49. Development of a Radiological Characterization Submersible ROV for Use at Fukushima Daiichi

Author

Nancekievill, M., Jones, A. R., Joyce, M. J., Lennox, B., Watson, S., Katakura, J., Okumura, K., Kamada, S., Katoh, M., Nishimura, K., Nancekievill, M., Jones, A. R., Joyce, M. J., Lennox, B., Watson, S., Katakura, J., Okumura, K., Kamada, S., Katoh, M., and Nishimura, K.

Abstract

To decommission the Fukushima nuclear power plant after the accident caused by a tsunami in 2011, characterization of the fuel debris is required. The precise location and radiological composition of the fuel debris are currently unknown, and the area is submerged making it difficult to investigate the primary containment vessel. An integrated system that includes both radiation detectors and sonar will allow the full localization and characterization of the fuel debris. This paper describes research completed toward the development of a complete system, on-board a low-cost, small form-factor, submersible remotely operated vehicle. A cerium bromide (CeBr3) scintillator detector for dose-rate monitoring and gamma-ray spectrometry has been integrated and validated experimentally with a 137Cs source, both in the laboratory and while submerged. The addition of an Imagenex 831L sonar has enabled technical demonstrations to take place at the National Maritime Research Institute's facility in Japan, where the system was able to characterize the shape and size of synthetic core debris. The combination of geometrical and radiological measurements allows the real-time localization of fuel debris and isotope identification, leading to an invaluable source of information to the workers at Fukushima that will enable increased efficiency and reduce risk during the decommissioning of the site.

Published
2018

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