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19,338 results on '"Takao, T"'

262. Isolation of bioactive compounds from Helix aspersa nerve tissue and the effect of pqpplpryamide on heart, esophagus and central neurons of H. aspersa and rectum of Anodonta woodiana

Author

Ohtani, M., primary, Muneoka, Y., additional, Matsushima, O., additional, Takao, T., additional, Shimonishi, Y., additional, White, A.R., additional, Pedder, S., additional, Sharma, R., additional, Lennon, M.A., additional, Katugampola, S., additional, and Walker, R.J., additional

Published
1997
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289. Effect of transient TCDD exposure on immortalized human trophoblast-derived cell lines.

Author

Fukushima, K, Tsukimori, K, Li, D, Takao, T, Morokuma, S, Kato, K, Seki, H, Takeda, S, Matsumura, S, and Wake, N

Subjects
PHYSIOLOGICAL effects of dioxins, TETRACHLORODIBENZODIOXIN, TROPHOBLAST, GROWTH factors, CELL proliferation
Abstract

Low level, antenatal exposure to dioxins is associated with low birth weight, which in turn is associated with long-term sequelae. We exposed the human extravillous cytotrophoblast (EVT) lines HTR-8/SV40 and TCL1 to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and assessed cell growth, invasion, and differentiation. TCDD had no effect on cell proliferation, invasion, or tube formation in Matrigel. The EVT-derived cells expressed a functional aryl hydrocarbon receptor protein; however, TCDD exposure did not alter expression levels of proteins involved in EVT differentiation in early pregnancy, including hypoxia-inducible factor 1A (HIF1A), vascular endothelial growth factor (VEGF), Integrin A1, A6, and AVB3. These results suggest that the reduction in fetal weight induced by dioxin is not the result of vascular remodeling via EVT dysfunction. [ABSTRACT FROM AUTHOR]

Published
2012
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290. Development of Nb3Al Rutherford Cable for High-Field Accelerator Magnet Applications.

Author

Tsuchiya, K., Kikuchi, A., Takeuchi, T., Banno, N., Iijima, Y., Nimori, S., Takigawa, H., Terashima, A., Nakamoto, T., Kuroda, Y., Maruyama, M., Yoshida, M., Takao, T., Nakagawa, K., Barzi, E., Yamada, R., and Zlobin, A.

Subjects
ACCELERATOR magnets, LARGE Hadron Collider, LUMINOSITY, CABLES
Abstract

We have been developing Nb3Al high-field accelerator magnets with the aim of upgrading the luminosity of the Large Hadron Collider. In this program, four kinds of Ta-matrix Nb3Al strands with slightly different cross-sectional structures (K1, K2, K3 and K4 strands) were designed and fabricated. The non-copper Jc values of these strands were 700–800 A/mm^2 at 15 T and 4.2 K. The cabling work of these strands was performed at Fermilab, and the superconducting properties of the cables were studied using the extracted strands from the cables. In this paper, we report on the fabrication experience for the strands and cables. The results obtained from this study are also presented. [ABSTRACT FROM PUBLISHER]

Published
2012
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292. Development of Ta-matrix Nb3Al Strand and Cable for High-Field Accelerator Magnet.

Author

Tsuchiya, K., Kikuchi, A., Takeuchi, T., Banno, N., Iijima, Y., Nimori, S., Takigawa, H., Terashima, A., Nakamoto, T., Kuroda, Y., Maruyama, M., Takao, T., Tanaka, K., Nakagawa, K., Barzi, E., Yamada, R., Zlobin, A., and Ghosh, A.

Subjects
SUPERCONDUCTING magnets, NIOBIUM compounds, MECHANICAL behavior of materials, SUPERCONDUCTIVITY, COPPER, MAGNETIZATION, CRITICAL currents, WIRE, SUPERCONDUCTORS
Abstract

Research and development of Nb3Al strands and cables for a high field accelerator magnet is ongoing under the framework of the CERN-KEK collaboration. In this program, new Ta-matrix Nb3Al strands were developed and their mechanical properties and superconducting properties were studied. The non-Cu Jc values of these strands were 750\sim 800\ \A/mm^2 at 15 T and 4.2 K. Using these strands, test fabrication of 27-strand Rutherford cable was carried out in collaboration with NIMS and Fermilab. The properties of the strands extracted from the cable were examined and it was found that there was no degradation of the superconducting properties of the strands. In this paper, we report the fabrication of the strands and the cable in brief and present some of the results obtained by studying their properties. [ABSTRACT FROM AUTHOR]

Published
2011
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293. Study of Nb3Al Wires for High-Field Accelerator Magnet Applications.

Author

Tsuchiya, K., Takeuchi, T., Banno, N., Kikuchi, A., Iijima, Y., Nimori, S., Takigawa, H., Terashima, A., Yamamoto, A., Kuroda, Y., Takao, T., Tagawa, K., Tanaka, K., and Nakagawa, K.

Subjects
NIOBIUM compounds, MAGNETS, CRITICAL currents, WIRE, HARDNESS, SUPERCONDUCTIVITY
Abstract

Rapid heating, quenching and transformation (RHQT)-processed Nb3Al wires possess better strain tolerance than Nb3Sn wires. However, RHQT-processed Nb3Al wires so far developed show lower non-copper critical current density (Jc) than recently developed high-(Jc) Nb3Sn wires in the field range of 12-15 T. Therefore, the development of Nb3Al wires having enhancing Jc in this field range is a major concern for accelerator magnet designers. Among a number of fabrication parameters that might affect properties, we analysed the effect of thickness of Al and Nb foils in the jelly-roll-shaped filaments embedded in the precursor wires. Mechanical and superconducting properties of these wires with various Al-foil thicknesses in the filaments were investigated. [ABSTRACT FROM AUTHOR]

Published
2010
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297. Towards beyond 1GHz NMR: Mechanism of the long-term drift of screening current-induced magnetic field in a Bi-2223 coil

Author

Koyama, Y., Takao, T., Yanagisawa, Y., Nakagome, H., Hamada, M., Kiyoshi, T., Takahashi, M., and Maeda, H.

Subjects
*MAGNETIC fields, *NUCLEAR magnetic resonance spectroscopy, *SUPERCONDUCTORS, *ELECTRIC coils, *HYSTERESIS, *COMPUTER simulation
Abstract

Abstract: The screening current-induced magnetic field in the (Bi,Pb)2Sr2Ca2Cu3O x (Bi-2223) insert coil proposed for a beyond 1GHz nuclear magnetic resonance (NMR) spectrometer may generate a long-term field drift, resulting in a loss of field-frequency lock operation and an inability to make high resolution NMR measurements. The measured screening current-induced magnetic field of a Bi-2223 double-pancake coil exhibits a hysteresis effect at 4.2K that is reproduced by a numerical simulation based on a finite thickness rectangular superconductor bar model. The screening current-induced field at the coil center is of opposite polarity to that generated by the coil current, and thus the apparent field intensity shows a positive drift with time. On the contrary, the field at a coil end is of the same polarity as the coil field, and the apparent field intensity decreases with time. If we wait for ∼1000h after coil excitation, the field drift rate approaches the field decay rate of the persistent current of 10−8 h−1, suitable for a long-term NMR measurement in a beyond 1GHz NMR spectrometer. [Copyright &y& Elsevier]

Published
2009
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