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Now showing items 1 - 16 of 86

  • Penetration analysis of projectile with inclined concrete target

    Kim, S.B.   Kim, H.W.   Yoo, Y.H.   Cadoni, E.  

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  • Canadian inter-laboratory organically bound tritium (OBT) analysis exercise

    Kim, S.B.   Olfert, J.   Baglan, N.   St-Amant, N.   Carter, B.   Clark, I.   Bucur, C.  

    Highlights • An inter-laboratory OBT analysis comparison was conducted. • The variations of the measured OBT activity concentrations were determined. • The current OBT analysis methods are generally acceptable. • A consensus OBT analysis methodology is required. Abstract Tritium emissions are one of the main concerns with regard to CANDU reactors and Canadian nuclear facilities. After the Fukushima accident, the Canadian Nuclear Regulatory Commission suggested that models used in risk assessment of Canadian nuclear facilities be firmly based on measured data. Procedures for measurement of tritium as HTO (tritiated water) are well established, but there are no standard methods and certified reference materials for measurement of organically bound tritium (OBT) in environmental samples. This paper describes and discusses an inter-laboratory comparison study in which OBT in three different dried environmental samples (fish, Swiss chard and potato) was measured to evaluate OBT analysis methods currently used by CANDU Owners Group (COG) members. The variations in the measured OBT activity concentrations between all laboratories were less than approximately 20%, with a total uncertainty between 11 and 17%. Based on the results using the dried samples, the current OBT analysis methods for combustion, distillation and counting are generally acceptable. However, a complete consensus OBT analysis methodology with respect to freeze-drying, rinsing, combustion, distillation and counting is required. Also, an exercise using low-level tritium samples (less than 100 Bq/L or 20 Bq/kg-fresh) would be useful in the near future to more fully evaluate the current OBT analysis methods.
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  • Study on optimization of YBCO thin film stack for compact NMR magnets

    Kim, S.B.   Kimoto, T.   Hahn, S.   Iwasa, Y.   Voccio, J.   Tomita, M.  

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  • Current understanding of organically bound tritium (OBT) in the environment

    Kim, S.B.   Baglan, N.   Davis, P.A.  

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  • OBT analysis method using polyethylene beads for limited quantities of animal tissue

    Kim, S.B.   Stuart, M.  

    Highlights • Polyethylene beads method for OBT determination in animal tissues and animal products were determined. • The method reduces process time. • The polyethylene beads method added no more than 25% uncertainty when appropriate correction factors are used. Abstract This study presents a polyethylene beads method for OBT determination in animal tissues and animal products for cases where the amount of water recovered by combustion is limited by sample size or quantity. In the method, the amount of water recovered after combustion is enhanced by adding tritium-free polyethylene beads to the sample prior to combustion in an oxygen bomb. The method reduces process time by allowing the combustion water to be easily collected with a pipette. Sufficient water recovery was achieved using the polyethylene beads method when 2 g of dry animal tissue or animal product were combusted with 2 g of polyethylene beads. Correction factors, which account for the dilution due to the combustion water of the beads, are provided for beef, chicken, pork, fish and clams, as well as egg, milk and cheese. The method was tested by comparing its OBT results with those of the conventional method using animal samples collected on the Chalk River Laboratories (CRL) site. The results determined that the polyethylene beads method added no more than 25% uncertainty when appropriate correction factors are used.
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  • Characteristics of a 3-D HTS actuator with various shaped electromagnets

    Kim, S.B.   Inoue, T.   Shimizu, A.   Joo, J.H.   Murase, S.  

    We have been investigating a three-dimensional (3-D) superconducting actuator using HTS bulk to develop the transportation device with non-contact and move in free space. Proposed superconducting actuator consists of the stator constructed by two-dimensional arranged electromagnets and HTS bulk superconductor as a mover. The 2-D arranged electromagnets were individually controlled to move the HTS bulk. It is expected that our proposed 3-D superconducting actuator will be useful as a transporter used in clean rooms where silicon wafers are manufactured. Wafers must be protected from contact with dust and other contamination. To realize the superconducting actuator with HTS bulks, the electromagnetic characteristics of HTS bulk, such as trapped field strength and patterns, should be clarified and the optimized controlling system is also required. Therefore, in this study, to construct the optimal 3-D actuator system, the fundamental characteristics of the levitation for HTS bulks with individually controlled four and eight-polarities electromagnets were investigated experimentally. And two kinds of cap cores attached the top of the core to improve the control ability of proposed actuator were fabricated and tested.
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  • Current Bypassing Properties by Thermal Switch for PCS Application on NMR/MRI HTS Magnets

    Kim, S.B.   Takahashi, M.   Saito, R.   Park, Y.J.   Lee, M.W.   Oh, Y.K.   Ann, H.S.  

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  • Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector

    Abe, K.   Abgrall, N.   Ajima, Y.   Aihara, H.   Albert, J.B.   Andreopoulos, C.   Andrieu, B.   Anerella, M.D.   Aoki, S.   Araoka, O.   Argyriades, J.   Ariga, A.   Ariga, T.   Assylbekov, S.   Autiero, D.   Badertscher, A.   Barbi, M.   Barker, G.J.   Barr, G.   Bass, M.   Batkiewicz, M.   Bay, F.   Bentham, S.   Berardi, V.   Berger, B.E.   Bertram, I.   Besnier, M.   Beucher, J.   Beznosko, D.   Bhadra, S.   Blaszczyk, F.D.M.   Blocki, J.   Blondel, A.   Bojechko, C.   Bouchez, J.   Boyd, S.B.   Bravar, A.   Bronner, C.   Brook-Roberge, D.G.   Buchanan, N.   Budd, H.   Calvet, D.   Cartwright, S.L.   Carver, A.   Castillo, R.   Catanesi, M.G.   Cazes, A.   Cervera, A.   Chavez, C.   Choi, S.   Christodoulou, G.   Coleman, J.   Collazuol, G.   Coleman, W.   Connolly, K.   Curioni, A.   Dabrowska, A.   Danko, I.   Das, R.   Davies, G.S.   Davis, S.   Day, M.   De Rosa, G.   de Andre, J.P.A.M.   de Perio, P.   Dealtry, T.   Delbart, A.   Densham, C.   Di Lodovico, F.   Di Luise, S.   Dinh Tran, P.   Dobson, J.   Dore, U.   Drapier, O.   Dufour, F.   Dumarchez, J.   Dytman, S.   Dziewiecki, M.   Dziomba, M.   Emery, S.   Ereditato, A.   Escallier, J.E.   Escudero, L.   Esposito, L.S.   Fechner, M.   Ferrero, A.   Finch, A.J.   Frank, E.   Fujii, Y.   Fukuda, Y.   Galymov, V.   Ganetis, G.L.   Gannaway, F.C.   Gaudin, A.   Gendotti, A.   George, M.   Giffin, S.   Giganti, C.   Gilje, K.   Ghosh, A.K.   Golan, T.   Goldhaber, M.   Gomez-Cadenas, J.J.   Gomi, S.   Gonin, M.   Grant, N.   Grant, A.   Gumplinger, P.   Guzowski, P.   Haesler, A.   Haigh, M.D.   Hamano, K.   Hansen, C.   Hansen, D.   Hara, T.   Harrison, P.F.   Hartfiel, B.   Hartz, M.   Haruyama, T.   Hasegawa, T.   Hastings, N.C.   Hatzikoutelis, A.   Hayashi, K.   Hayato, Y.   Hearty, C.   Helmer, R.L.   Henderson, R.   Higashi, N.   Hignight, J.   Hillairet, A.   Hirose, E.   Holeczek, J.   Horikawa, S.   Hyndman, A.   Ichikawa, A.K.   Ieki, K.   Ieva, M.   Iida, M.   Ikeda, M.   Ilic, J.   Imber, J.   Ishida, T.   Ishihara, C.   Ishii, T.   Ives, S.J.   Iwasaki, M.   Iyogi, K.   Izmaylov, A.   Jamieson, B.   Johnson, R.A.   Joo, K.K.   Jover-Manas, G.V.   Jung, C.K.   Kaji, H.   Kajita, T.   Kakuno, H.   Kameda, J.   Kaneyuki, K.   Karlen, D.   Kasami, K.   Kato, I.   Kawamuko, H.   Kearns, E.   Khabibullin, M.   Khanam, F.   Khotjantsev, A.   Kielczewska, D.   Kikawa, T.   Kim, J.   Kim, J.Y.   Kim, S.B.   Kimura, N.   Kirby, B.   Kisiel, J.   Kitching, P.   Kobayashi, T.   Kogan, G.   Koike, S.   Konaka, A.   Kormos, L.L.   Korzenev, A.   Koseki, K.   Koshio, Y.   Kouzuma, Y.   Kowalik, K.   Kravtsov, V.   Kreslo, I.   Kropp, W.   Kubo, H.   Kubota, J.   Kudenko, Y.   Kulkarni, N.   Kurimoto, Y.   Kurjata, R.   Kutter, T.   Lagoda, J.   Laihem, K.   Laveder, M.   Lee, K.P.   Le, P.T.   Levy, J.M.   Licciardi, C.   Lim, I.T.   Lindner, T.   Litchfield, R.P.   Litos, M.   Longhin, A.   Lopez, G.D.   Loverre, P.F.   Ludovici, L.   Lux, T.   Macaire, M.   Mahn, K.   Makida, Y.   Malek, M.   Manly, S.   Marchionni, A.   Marino, A.D.   Marone, A.J.   Marteau, J.   Martin, J.F.   Maruyama, T.   Maryon, T.   Marzec, J.   Masliah, P.   Mathie, E.L.   Matsumura, C.   Matsuoka, K.   Matveev, V.   Mavrokoridis, K.   Mazzucato, E.   McCauley, N.   McFarland, K.S.   McGrew, C.   McLachlan, T.   Messina, M.   Metcalf, W.   Metelko, C.   Mezzetto, M.   Mijakowski, P.   Miller, C.A.   Minamino, A.   Mineev, O.   Mine, S.   Missert, A.D.   Mituka, G.   Miura, M.   Mizouchi, K.   Monfregola, L.   Moreau, F.   Morgan, B.   Moriyama, S.   Muir, A.   Murakami, A.   Muratore, J.F.   Murdoch, M.   Murphy, S.   Myslik, J.   Nagai, N.   Nakadaira, T.   Nakahata, M.   Nakai, T.   Nakajima, K.   Nakamoto, T.   Nakamura, K.   Nakayama, S.   Nakaya, T.   Naples, D.   Navin, M.L.   Nelson, B.   Nicholls, T.C.   Nielsen, C.   Nishikawa, K.   Nishino, H.   Nitta, K.   Nobuhara, T.   Nowak, J.A.   Obayashi, Y.   Ogitsu, T.   Ohhata, H.   Okamura, T.   Okumura, K.   Okusawa, T.   Oser, S.M.   Otani, M.   Owen, R.A.   Oyama, Y.   Ozaki, T.   Pac, M.Y.   Palladino, V.   Paolone, V.   Paul, P.   Payne, D.   Pearce, G.F.   Perkin, J.D.   Pettinacci, V.   Pierre, F.   Poplawska, E.   Popov, B.   Posiadala, M.   Poutissou, J.-M.   Poutissou, R.   Przewlocki, P.   Qian, W.   Raaf, J.L.   Radicioni, E.   Ratoff, P.N.   Raufer, T.M.   Ravonel, M.   Raymond, M.   Retiere, F.   Robert, A.   Rodrigues, P.   Rondio, E.   Roney, J.M.   Rossi, B.   Roth, S.   Rubbia, A.   Ruterbories, D.   Sabouri, S.   Sacco, R.   Sakashita, K.   Sanchez, F.   Sarrat, A.   Sasaki, K.   Scholberg, K.   Schwehr, J.   Scott, M.   Scully, D.I.   Seiya, Y.   Sekiguchi, T.   Sekiya, H.   Shibata, M.   Shimizu, Y.   Shiozawa, M.   Short, S.   Siyad, M.   Smith, R.J.   Smy, M.   Sobczyk, J.T.   Sobel, H.   Sorel, M.   Stahl, A.   Stamoulis, P.   Steinmann, J.   Still, B.   Stone, J.   Stodulski, M.   Strabel, C.   Sulej, R.   Suzuki, A.   Suzuki, K.   Suzuki, S.   Suzuki, S.Y.   Suzuki, Y.   Suzuki, Y.   Swierblewski, J.   Szeglowski, T.   Szeptycka, M.   Tacik, R.   Tada, M.   Taguchi, M.   Takahashi, S.   Takeda, A.   Takenaga, Y.   Takeuchi, Y.   Tanaka, K.   Tanaka, H.A.   Tanaka, M.   Tanaka, M.M.   Tanimoto, N.   Tashiro, K.   Taylor, I.   Terashima, A.   Terhorst, D.   Terri, R.   Thompson, L.F.   Thorley, A.   Toki, W.   Tobayama, S.   Tomaru, T.   Totsuka, Y.   Touramanis, C.   Tsukamoto, T.   Tzanov, M.   Uchida, Y.   Ueno, K.   Vacheret, A.   Vagins, M.   Vasseur, G.   Wachala, T.   Walding, J.J.   Waldron, A.V.   Walter, C.W.   Wanderer, P.J.   Wang, J.   Ward, M.A.   Ward, G.P.   Wark, D.   Wascko, M.O.   Weber, A.   Wendell, R.   West, N.   Whitehead, L.H.   Wikstrom, G.   Wilkes, R.J.   Wilking, M.J.   Williamson, Z.   Wilson, J.R.   Wilson, R.J.   Wongjirad, T.   Yamada, S.   Yamada, Y.   Yamamoto, A.   Yamamoto, K.   Yamanoi, Y.   Yamaoka, H.   Yamauchi, T.   Yanagisawa, C.   Yano, T.   Yen, S.   Yershov, N.   Yokoyama, M.   Yuan, T.   Zalewska, A.   Zalipska, J.   Zambelli, L.   Zaremba, K.   Ziembicki, M.   Zimmerman, E.D.   Zito, M.   Zmuda, J.  

    Precise measurement of neutrino beam direction and intensity was achieved based on a new concept with modularized neutrino detectors. INGRID (Interactive Neutrino GRID) is an on-axis near detector for the T2K long baseline neutrino oscillation experiment. INGRID consists of 16 identical modules arranged in horizontal and vertical arrays around the beam center. The module has a sandwich structure of iron target plates and scintillator trackers. INGRID directly monitors the muon neutrino beam profile center and intensity using the number of observed neutrino events in each module. The neutrino beam direction is measured with accuracy better than 0.4mrad from the measured profile center. The normalized event rate is measured with 4% precision. [All rights reserved Elsevier].
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  • Least squares phase unwrapping in wavelet domain

    Kim, S.B.   Kim, Y.-S.  

    Two-dimensional phase unwrapping is an important processing step in some coherent imaging applications. Least squares phase unwrapping is one of the robust techniques used to solve two-dimensional phase unwrapping problems. However, owing to its sparse structure, the convergence rate is very slow, and some practical methods have been applied to improve this condition. A new method for solving the least squares two-dimensional phase unwrapping problem is presented. This technique is based on the multiresolution representation of a linear system using the discrete wavelet transform. By applying the wavelet transform, the original system is decomposed into its coarse and fine resolution levels. Fast convergence in separate coarse resolution levels makes the overall system convergence very fast
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  • Robust control for a two-axis gimbaled sensor system with multivariable feedback systems

    Kim, S.B.   Kim, S.H.   Kwak, Y.K.  

    A dynamic model for the stabilisation loop of a two-axis gimbaled sensor system is formulated and system parameters have been identified by practical experiments. The validity of the dynamic model is illustrated by the experimental and simulation result. The Lead-proportional-integral (PI) controller design using a loop-shaping method based on the frequency response for the stabilisation loop of the sensor system is realised. This practical design approach has been proven to be simple and robust in actual application. The robust Hinfin controller design approach combining model matching and mixed sensitivity problem to improve the command following and disturbance rejection performance in the presence of external disturbances and model uncertainties is implemented, which is designed within the framework of the standard Hinfin optimisation problem by combining a conventional mixed sensitivity and model matching problem with robust stability. The experimental and simulation results show that the both two proposed controllers satisfy all desired requirements for the stabilisation loop associated with the gain crossover frequency, the gain and phase margin and the body-motion decoupling performance. It is shown through performance comparison and analysis that the proposed Hinfin controller is preferable to the proposed Lead-PI controller in terms of system stability, the disturbance rejection rate and because of its fast time response characteristics. However, it is clear that the two proposed controller design procedures for the robust control of the stabilisation loop of a two-axis gimbaled sensor system can be very effective in practical applications in terms of both stability and disturbance rejection.
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  • Cap core design for high levitation force in a 3D superconducting actuator with HTS bulk

    Joo, J.H.   Kim, S.B.   Inoue, T.   Shimizu, A.   Murase, S.  

    We have been developing a 3D superconducting actuator with HTS (high temperature superconducting) bulk and two-dimensionally arranged multiple electromagnets. The application of HTS bulk enables stable levitation and suspension due to its strong pinning force. The performance of the actuator is determined mainly by the spatial distribution of the generated magnetic field of the electromagnets. For the sake of improving the levitation force, we proposed to attach a sliced iron sheet (we called this cap core) on the top surface of the core in each electromagnet. The proposed cap core was expected to lead to an intensive concentration and abrupt gradient increase of the perpendicular component in the magnetic field through the HTS bulk of the electromagnets. We experimentally confirmed and measured the effect of the cap core. For the optimized design of the cap core, we calculated the spatial distribution of the magnetic field on the surface of the electromagnet using 3D FEM analysis for several cap cores and estimated the levitation force of the HTS bulk using the calculated result.[All rights reserved Elsevier].
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  • Low-field magnetoresistance and magnetic study of Ba 2Fe 1+xMo 1-xO 6

    Lee, W.Y.   Han, H.   Kim, S.B.   Kim, C.S.   Lee, B.W.  

    We have investigated low-field magnetoresistance (MR) and magnetic properties of Ba 2Fe 1+xMo 1-xO 6 (x=0-0.2) to point out some effects of Fe-Mo disorder between the Fe and Mo ions. Polycrystalline samples have been prepared by the conventional solid-state reaction in a stream of 5% H 2-Ar gas. X-ray data indicate that the symmetry is cubic and the data are compatible with the Fm3m space group. All samples are single phase and exhibit a series of superstructure-reflection lines due to cation order of Fe and Mo. The magnitude of the negative MR is 2.9% for x=0 and 1.5% for x=0.2 at room temperature with magnetic fields of 7 kOe. Saturation magnetization is 2.8 mu B/f.u. for x=0.2 which is smaller than the value of 3.8 mu B/f.u. for x=0. This large variation of magnetization between x=0 and 0.2 arises from the disorder at the Fe and Mo sites
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  • The time of flight detector at CDF

    Grozis, C.   Kephart, R.   Stanek, R.   Kim, B.   Kim, D.H.   Kim, S.B.   Oh, Y.   Yu, I.   Carithers, W.   Kim, Y.K.   Anikeev, K.   Bauer, G.   Furic, I.K.   Korn, A.   Kravchenko, I.   Mulhearn, M.   Paus, Ch.   Pavlon, S.   Sumorok, K.   Cabrera, S.   Rodrigo, T.   Ruiz, A.   Vila, I.   Chen, C.   Jones, M.   Kononenko, W.   Kroll, J.   Mayers, G.M.   Newcomer, F.M.   Usynin, D.   Van Berg, R.   Bellettini, G.   Cerri, C.   Menzione, A.   Depedis, D.   Dionisi, C.   Giagu, S.   Rescigno, M.   Zanello, L.   Kazama, A.   Kim, S.H.   Matsunaga, H.   Motohashi, S.   Sato, K.   Takikawa, K.   Ukegawa, F.  

    A time-of-flight detector (TOF) has been incorporated into the CDF-II experiment in order to provide charged kaon identification to improve neutral B meson flavor determination. With an expected time-of-flight resolution of 100 ps, the system will be able to provide 2 standard deviation separation between K plusmn and pi plusmn for momenta p<1.6 GeV/c, complementing the specific ionization energy loss dE/dx measured with the new drift chamber
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  • Quantification of exchangeable and non-exchangeable organically bound tritium (OBT) in vegetation

    Kim, S.B.   Korolevych, V.  

    The objective of this study is to quantify the relative amounts of exchangeable organically bound tritium (OBT) and non-exchangeable OBT in various vegetables. A garden plot at Perch Lake, where tritium levels are slightly elevated due to releases of tritium from a nearby nuclear waste management area and Chalk River Laboratories (CRL) operations, was used to cultivate a variety of vegetables. Five different kinds of vegetables (lettuce, cabbage, tomato, radish and beet) were studied. Exchangeable OBT behaves like tritium in tissue free water in living organisms and, based on past measurements, accounts for about 20% of the total tritium in dehydrated organic materials. In this study, the percentage of the exchangeable OBT was determined to range from 20% to 57% and was found to depend on the type of vegetables as well as the sequence of the plants exposure to HTO. Crown Copyright (c) 2012 Published by Elsevier Ltd. All rights reserved.
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  • Magnetic-field properties of high critical current density YBCO films deposited by TFA-MOD

    Kim, S.B.   Murase, S.   Yamada, Y.   Araki, T.   Hirabayashi, I.  

    The critical current density, Jc, of metal-organic deposition process using trifluoroacetates (TFA-MOD) based YBCO films was measured between 20 K and 77 K in magnetic fields up to 9.5 T as a function of the field direction. C-axis oriented YBCO films was deposited on LaAlO 3 single crystalline substrates and also on CeO 2 buffered IBAD (YSZ/Hastelloy) substrates by TFA-MOD method. The obtained Jc values at 77 K and 0 T were 7 and 1.7 MA/cm 2 for LaAlO 3 and IBAD substrates, respectively. High Jc values over 10 5 A/cm 2 were maintained up to 4 T (B//c-axis) for the LaAlO 3 substrate and up to 3 T (B//c-axis) for the CeO 2 buffered IBAD substrate. These results imply that TFA-MOD with simple fabrication process is very promising for the practical YBCO coated conductor. And the dependences on temperature and angular of the Jc at various external magnetic fields for some different thicknesses YBCO films was reported
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  • Elucidating therapeutic molecular targets in premenopausal Asian women with recurrent breast cancers

    Yap, Y.S.   Singh, A.   Lim, J.H.C.   Ahn, J.H.   Jung, K.H.   Kim, J.   Dent, R.   Ng, R.C.H.   Kim, S.B.   Chiang, D.  

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