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12 results on '"Wiik K"'

2. A study of cosmic ray secondaries induced by the Mir space station using AMS-01

Author

Aguilar, M., Alcaraz, J., Allaby, J., Alpat, B., Ambrosi, G., Anderhub, H., Ao, L., Arefiev, A., Azzarello, P., Babucci, E., Baldini, L., Basile, M., Barancourt, D., Barao, F., Barbier, G., Barreira, G., Battiston, R., Becker, R., Becker, U., Bellagamba, L., Béné, P., Berdugo, J., Berges, P., Bertucci, B., Biland, A., Bizzaglia, S., Blasko, S., Boella, G., Boschini, M., Bourquin, M., Brocco, L., Bruni, G., Buénerd, M., Burger, J.D., Burger, W.J., Cai, X.D., Camps, C., Cannarsa, P., Capell, M., Carosi, G., Casadei, D., Casaus, J., Castellini, G., Cecchi, C., Chang, Y.H., Chen, H.F., Chen, H.S., Chen, Z.G., Chernoplekov, N.A., Chiueh, T.H., Cho, K., Choi, M.J., Choi, Y.Y., Chuang, Y.L., Cindolo, F., Commichau, V., Contin, A., Cortina-Gil, E., Cristinziani, M., da Cunha, J.P., Dai, T.S., Delgado, C., Demirköz, B., Deus, J.D., Dinu, N., Djambazov, L., D’Antone, I., Dong, Z.R., Emonet, P., Engelberg, J., Eppling, F.J., Eronen, T., Esposito, G., Extermann, P., Favier, J., Fiandrini, E., Fisher, P.H., Fluegge, G., Fouque, N., Galaktionov, Yu., Gervasi, M., Giusti, P., Grandi, D., Grimm, O., Gu, W.Q., Hangarter, K., Hasan, A., Henning, R., Hermel, V., Hofer, H., Huang, M.A., Hungerford, W., Ionica, M., Ionica, R., Jongmanns, M., Karlamaa, K., Karpinski, W., Kenney, G., Kenny, J., Kim, D.H., Kim, G.N., Kim, K.S., Kim, M.Y., Klimentov, A., Kossakowski, R., Koutsenko, V., Kraeber, M., Laborie, G., Laitinen, T., Lamanna, G., Lanciotti, E., Laurenti, G., Lebedev, A., Lechanoine-Leluc, C., Lee, M.W., Lee, S.C., Levi, G., Levtchenko, P., Liu, C.L., Liu, H.T., Lopes, I., Lu, G., Lu, Y.S., Lübelsmeyer, K., Luckey, D., Lustermann, W., Maña, C., Margotti, A., Mayet, F., McNeil, R.R., Meillon, B., Menichelli, M., Mihul, A., Monreal, B., Mourao, A., Mujunen, A., Palmonari, F., Papi, A., Park, H.B., Park, W.H., Pauluzzi, M., Pauss, F., Perrin, E., Pesci, A., Pevsner, A., Pimenta, M., Plyaskin, V., Pojidaev, V., Pohl, M., Postolache, V., Produit, N., Rancoita, P.G., Rapin, D., Raupach, F., Ren, D., Ren, Z., Ribordy, M., Richeux, J.P., Riihonen, E., Ritakari, J., Ro, S., Roeser, U., Rossin, C., Sagdeev, R., Santos, D., Sartorelli, G., Sbarra, C., Schael, S., Schultz von Dratzig, A., Schwering, G., Scolieri, G., Seo, E.S., Shin, J.W., Shoumilov, E., Shoutko, V., Siedling, R., Son, D., Song, T., Steuer, M., Sun, G.S., Suter, H., Tang, X.W., Ting, Samuel C.C., Ting, S.M., Tornikoski, M., Torsti, J., Trümper, J., Ulbricht, J., Urpo, S., Valtonen, E., Vandenhirtz, J., Velcea, F., Velikhov, E., Verlaat, B., Vetlitsky, I., Vezzu, F., Vialle, J.P., Viertel, G., Vité, D., Von Gunten, H., Waldmeier Wicki, S., Wallraff, W., Wang, B.C., Wang, J.Z., Wang, Y.H., Wiik, K., Williams, C., Wu, S.X., Xia, P.C., Yan, J.L., Yan, L.G., Yang, C.G., Yang, J., Yang, M., Ye, S.W., Yeh, P., Xu, Z.Z., Zhang, H.Y., Zhang, Z.P., Zhao, D.X., Zhu, G.Y., Zhu, W.Z., Zhuang, H.L., Zichichi, A., Zimmermann, B., and Zuccon, P.

Published
2005
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3. The Alpha Magnetic Spectrometer (AMS)

Author

Alcaraz, J., Alpat, B., Ambrosi, G., Anderhub, H., Ao, L., Arefiev, A., Azzarello, P., Babucci, E., Baldini, L., Basile, M., Barancourt, D., Barao, F., Barbier, G., Barreira, G., Battiston, R., Becker, R., Becker, U., Bellagamba, L., Bene, P., Berdugo, J., Berges, P., Bertucci, B., Biland, A., Bizzaglia, S., Blasko, S., Boella, G., Boschini, M., Bourquin, M., Brocco, L., Bruni, G., Buenerd, M., Burger, J.D., Burger, W.J., Cai, X.D., Camps, C., Cannarsa, P., Capell, M., Casadei, D., Casaus, J., Castellini, G., Cecchi, C., Chang, Y.H., Chen, H.F., Chen, H.S., Chen, Z.G., Chernoplekov, N.A., Chiueh, T.H., Chuang, Y.L., Cindolo, F., Commichau, V., Contin, A., Crespo, P., Cristinziani, M., da Cunha, J.P., Dai, T.S., Deus, J.D., Dinu, N., Djambazov, L., DAntone, I., Dong, Z.R., Emonet, P., Engelberg, J., Eppling, F.J., Eronen, T., Esposito, G., Extermann, P., Favier, J., Fiandrini, E., Fisher, P.H., Fluegge, G., Fouque, N., Galaktionov, Yu., Gervasi, M., Giusti, P., Grandi, D., Grimm, O., Gu, W.Q., Hangarter, K., Hasan, A., Hermel, V., Hofer, H., Huang, M.A., Hungerford, W., Ionica, M., Ionica, R., Jongmanns, M., Karlamaa, K., Karpinski, W., Kenney, G., Kenny, J., Kim, W., Klimentov, A., Kossakowski, R., Koutsenko, V., Kraeber, M., Laborie, G., Laitinen, T., Lamanna, G., Laurenti, G., Lebedev, A., Lee, S.C., Levi, G., Levtchenko, P., Liu, C.L., Liu, H.T., Lopes, I., Lu, G., Lu, Y.S., Lübelsmeyer, K., Luckey, D., Lustermann, W., Maña, C., Margotti, A., Mayet, F., McNeil, R.R., Meillon, B., Menichelli, M., Mihul, A., Mourao, A., Mujunen, A., Palmonari, F., Papi, A., Park, I.H., Pauluzzi, M., Pauss, F., Perrin, E., Pesci, A., Pevsner, A., Pimenta, M., Plyaskin, V., Pojidaev, V., Postolache, V., Produit, N., Rancoita, P.G., Rapin, D., Raupach, F., Ren, D., Ren, Z., Ribordy, M., Richeux, J.P., Riihonen, E., Ritakari, J., Roeser, U., Roissin, C., Sagdeev, R., Sartorelli, G., Schultz von Dratzig, A., Schwering, G., Scolieri, G., Seo, E.S., Shoutko, V., Shoumilov, E., Siedling, R., Son, D., Song, T., Steuer, M., Sun, G.S., Suter, H., Tang, X.W., Ting, Samuel C.C., Ting, S.M., Tornikoski, M., Torsti, J., Tr umper, J., Ulbricht, J., Urpo, S., Usoskin, I., Valtonen, E., Vandenhirtz, J., Velcea, F., Velikhov, E., Verlaat, B., Vetlitsky, I., Vezzu, F., Vialle, J.P., Viertel, G., Vite, D., Gunten, H.Von, Wicki, S.Waldmeier, Wallraff, W., Wang, B.C., Wang, J.Z., Wang, Y.H., Wiik, K., Williams, C., Wu, S.X., Xia, P.C., Yan, J.L., Yan, L.G., Yang, C.G., Yang, M., Ye, S.W., Yeh, P., Xu, Z.Z., Zhang, H.Y., Zhang, Z.P., Zhao, D.X., Zhu, G.Y., Zhu, W.Z., Zhuang, H.L., Zichichi, A., and Zimmermann, B.

Published
2002
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7. Cosmic protons

Author

Alcaraz, J, Alpat, B, Ambrosi, G, Anderhub, H, Ao, L, Arefiev, A, Azzarello, P, Babucci, E, Baldini, L, Basile, M, Barancourt, D, Barao, F, Barbier, G, Barreira, G, Battiston, R, Becker, R, Becker, U, Bellagamba, L, Béné, P, Berdugo, J, Berges, P, Bertucci, B, Biland, A, Bizzaglia, S, Blasko, S, Boella, G, Boschini, M, Bourquin, M, Brocco, L, Bruni, G, Buenerd, M, Burger, J, Burger, W, Cai, X, Camps, C, Cannarsa, P, Capell, M, Casadei, D, Casaus, J, Castellini, G, Cecchi, C, Chang, Y, Chen, H, Chen, Z, Chernoplekov, N, Chiueh, T, Chuang, Y, Cindolo, F, Commichau, V, Contin, A, Crespo, P, Cristinziani, M, Cunha, J, Dai, T, Deus, J, Dinu, N, Djambazov, L, D'Antone, I, Dong, Z, Emonet, P, Engelberg, J, Eppling, F, Eronen, T, Esposito, G, Extermann, P, Favier, J, Fiandrini, E, Fisher, P, Fluegge, G, Fouque, N, Galaktionov, Y, Gervasi, M, Giusti, P, Grandi, D, Grimm, O, Gu, W, Hangarter, K, Hasan, A, Hermel, V, Hofer, H, Huang, M, Hungerford, W, Ionica, M, Ionica, R, Jongmanns, M, Karlamaa, K, Karpinski, W, Kenney, G, Kenny, J, Kim, W, Klimentov, A, Kossakowski, R, Koutsenko, V, Kraeber, M, Laborie, G, Laitinen, T, Lamanna, G, Laurenti, G, Lebedev, A, Lee, S, Levi, G, Levtchenko, P, Liu, C, Liu, H, Lopes, I, Lu, G, Lu, Y, Lübelsmeyer, K, Luckey, D, Lustermann, W, Maña, C, Margotti, A, Mayet, F, Mcneil, R, Meillon, B, Menichelli, M, Mihul, A, Mourao, A, Mujunen, A, Palmonari, F, Papi, A, Park, I, Pauluzzi, M, Pauss, F, Perrin, E, Pesci, A, Pevsner, A, Pimenta, M, Plyaskin, V, Pojidaev, V, Pohl, M, Postolache, V, Produit, N, Rancoita, P, Rapin, D, Raupach, F, Ren, D, Ren, Z, Ribordy, M, Richeux, J, Riihonen, E, Ritakari, J, Roeser, U, Roissin, C, Sagdeev, R, Sartorelli, G, Dratzig, A, Schwering, G, Scolieri, G, Seo, E, Shoutko, V, Shoumilov, E, Siedling, R, Son, D, Song, T, Steuer, M, Sun, G, Suter, H, Tang, X, Ting, S, Tornikoski, M, Torsti, J, Trümper, J, Ulbricht, J, Urpo, S, Usoskin, I, Valtonen, E, Vandenhirtz, J, Velcea, F, Velikhov, E, Verlaat, B, Vetlitsky, I, Vezzu, F, Vialle, J, Viertel, G, Vité, D, Gunten, H, Wicki, S, Wallraff, W, Wang, B, Wang, J, Wang, Y, Wiik, K, Williams, C, Wu, S, Xia, P, Yan, J, Yan, L, Yang, C, Yang, M, Ye, S, Yeh, P, Xu, Z, Zhang, H, Zhang, Z, Zhao, D, Zhu, G, Zhu, W, Zhuang, H, Zichichi, A, Zimmermann, B, BOELLA, GIULIANO FILIPPO, GERVASI, MASSIMO, McNeil, R, Zimmermann, B., Alcaraz, J, Alpat, B, Ambrosi, G, Anderhub, H, Ao, L, Arefiev, A, Azzarello, P, Babucci, E, Baldini, L, Basile, M, Barancourt, D, Barao, F, Barbier, G, Barreira, G, Battiston, R, Becker, R, Becker, U, Bellagamba, L, Béné, P, Berdugo, J, Berges, P, Bertucci, B, Biland, A, Bizzaglia, S, Blasko, S, Boella, G, Boschini, M, Bourquin, M, Brocco, L, Bruni, G, Buenerd, M, Burger, J, Burger, W, Cai, X, Camps, C, Cannarsa, P, Capell, M, Casadei, D, Casaus, J, Castellini, G, Cecchi, C, Chang, Y, Chen, H, Chen, Z, Chernoplekov, N, Chiueh, T, Chuang, Y, Cindolo, F, Commichau, V, Contin, A, Crespo, P, Cristinziani, M, Cunha, J, Dai, T, Deus, J, Dinu, N, Djambazov, L, D'Antone, I, Dong, Z, Emonet, P, Engelberg, J, Eppling, F, Eronen, T, Esposito, G, Extermann, P, Favier, J, Fiandrini, E, Fisher, P, Fluegge, G, Fouque, N, Galaktionov, Y, Gervasi, M, Giusti, P, Grandi, D, Grimm, O, Gu, W, Hangarter, K, Hasan, A, Hermel, V, Hofer, H, Huang, M, Hungerford, W, Ionica, M, Ionica, R, Jongmanns, M, Karlamaa, K, Karpinski, W, Kenney, G, Kenny, J, Kim, W, Klimentov, A, Kossakowski, R, Koutsenko, V, Kraeber, M, Laborie, G, Laitinen, T, Lamanna, G, Laurenti, G, Lebedev, A, Lee, S, Levi, G, Levtchenko, P, Liu, C, Liu, H, Lopes, I, Lu, G, Lu, Y, Lübelsmeyer, K, Luckey, D, Lustermann, W, Maña, C, Margotti, A, Mayet, F, Mcneil, R, Meillon, B, Menichelli, M, Mihul, A, Mourao, A, Mujunen, A, Palmonari, F, Papi, A, Park, I, Pauluzzi, M, Pauss, F, Perrin, E, Pesci, A, Pevsner, A, Pimenta, M, Plyaskin, V, Pojidaev, V, Pohl, M, Postolache, V, Produit, N, Rancoita, P, Rapin, D, Raupach, F, Ren, D, Ren, Z, Ribordy, M, Richeux, J, Riihonen, E, Ritakari, J, Roeser, U, Roissin, C, Sagdeev, R, Sartorelli, G, Dratzig, A, Schwering, G, Scolieri, G, Seo, E, Shoutko, V, Shoumilov, E, Siedling, R, Son, D, Song, T, Steuer, M, Sun, G, Suter, H, Tang, X, Ting, S, Tornikoski, M, Torsti, J, Trümper, J, Ulbricht, J, Urpo, S, Usoskin, I, Valtonen, E, Vandenhirtz, J, Velcea, F, Velikhov, E, Verlaat, B, Vetlitsky, I, Vezzu, F, Vialle, J, Viertel, G, Vité, D, Gunten, H, Wicki, S, Wallraff, W, Wang, B, Wang, J, Wang, Y, Wiik, K, Williams, C, Wu, S, Xia, P, Yan, J, Yan, L, Yang, C, Yang, M, Ye, S, Yeh, P, Xu, Z, Zhang, H, Zhang, Z, Zhao, D, Zhu, G, Zhu, W, Zhuang, H, Zichichi, A, Zimmermann, B, BOELLA, GIULIANO FILIPPO, GERVASI, MASSIMO, McNeil, R, and Zimmermann, B.

Abstract

The primary proton spectrum in the kinetic energy range 0.2 to 200 GeV was measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS–91 at an altitude of 380 km. The complete data set combining three shuttle attitudes and including all known systematic effects is presented

Published
2000

8. Oxygen permeation in the system SrFeO3−x–SrCoO3−y.

Author

Wiik, K., Aasland, S., Hansen, H.L., Tangen, I.L., and Ødegård, R.

Subjects
*STRONTIUM compounds, *DIFFUSION
Abstract

Oxygen flux through dense membranes with composition SrFeO3−δ, SrFe0.67Co0.33O3−δ and Sr0.97Fe0.33Co0.67O3−δ (0, 33% and 67% Co) have been measured primarily at 1000 °C as a function of membrane thickness with synthetic air on the primary side and He on the secondary side. Maximum flux rate was found to increase with cobalt content with an observed maximum for a membrane with composition 67% cobalt and thickness 0.5 mm corresponding to 3.8×10−6 mol/cm2 s. Based on experimental data, the critical thickness has been estimated to decrease from 2.0 mm for SrFeO3−δ to 0.7 mm for a compound with 67% cobalt added. A severe oxygen flux reduction is observed below approx. 900 °C for membrane samples with composition Sr0.97Fe0.33Co0.67O3−δ, corresponding to a transition from a cubic perovskite with disordered oxygen vacancies to a rhombohedral brownmillerite structure with ordered oxygen vacancies. [Copyright &y& Elsevier]

Published
2002
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9. Shaping of advanced asymmetric structures of proton conducting ceramic materials for SOFC and membrane-based process applications

Author

Fontaine, M.L., Larring, Y., Smith, J.B., Raeder, H., Andersen, Ø.S., Einarsrud, M.-A., Wiik, K., and Bredesen, R.

Subjects
*CERAMICS, *SOLID oxide fuel cells, *ELECTROLYTES, *PROTON exchange membrane fuel cells, *MANUFACTURING processes, *PYROLYSIS
Abstract

Abstract: A versatile fabrication process combining three techniques easy to scale up was successfully developed to prepare advanced multilayered structures integrating proton conducting ceramic materials. This enables the production of novel solid oxide fuel cells with proton conducting electrolytes (PCFCs) and asymmetric membranes designed as thin dense layers coated on thick porous mechanical supports. The manufacturing process makes use of ceramic powders synthesized by spray-pyrolysis using water-based solutions. Porous supports of membranes and anodes of PCFCs were prepared by tape-casting and their porosity was tuned by addition of corn starch filler. Membrane and electrolyte layers were prepared by spin-coating colloidal ceramic suspensions. A single coating-sintering step was carried out to produce gas tight layers with thickness ranging from 4 to 26μm. Cathodes of PCFCs were screen-printed using commercial Pt ink. This paper describes the successful preparation of SrCe0.95Yb0.05O3−δ asymmetric membranes and novel concepts of PCFCs integrating BaZr0.9Y0.1O3−δ and La0.995Sr0.005NbO4+δ electrolytes. [Copyright &y& Elsevier]

Published
2009
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10. Novel high temperature proton conducting fuel cells: Production of La0.995Sr0.005NbO4−δ electrolyte thin films and compatible cathode architectures

Author

Fontaine, M.-L., Larring, Y., Haugsrud, R., Norby, T., Wiik, K., and Bredesen, R.

Subjects
*FUEL cells, *PROTONS, *ELECTROLYTES, *CATHODES, *SOLID oxide fuel cells, *NIOBATES, *MECHANICAL behavior of materials
Abstract

Abstract: For breakthrough development in solid oxide fuel cells, novel cell architectures integrating better performing materials and cost-effective manufacturing processes with potential for mass production must be realised. The present work addresses this on the basis of the recent discovery of acceptor doped rare-earth ortho-niobate proton conductors and the development of a versatile fabrication process. La0.995Sr0.005NbO4−δ /NiO anodes are produced by tape-casting and co-lamination of green layers. Their porosity is finely tuned by using a pyrolyzable pore former. La0.995Sr0.005NbO4−δ electrolytes are spin-coated using ceramic-based suspensions. Fully dense electrolytes with thickness ranging from 9μm to 26μm are obtained after sintering in air at 1350°C. The cathode layers are then screen-printed. To match thermal expansion and to avoid chemical reaction between the functional layers, special attention is paid to the design of cathode architectures. CaTi0.9Fe0.1O3−δ , La2NiO4+δ and La4Ni3O10 mixed oxygen ion and electron conducting oxides are investigated as either monophase or La0.995Sr0.005NbO4−δ -based composite electrodes. The latter gives the whole cell an innovative “semi-monolithic” concept, which can take advantage of the chemical and mechanical stability of La0.995Sr0.005NbO4−δ , as well as of inherent material integration. Most promising cell architectures are finally selected based on thermo-mechanical and chemical compatibility of all functional layers. [Copyright &y& Elsevier]

Published
2009
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11. Densification and properties of zirconia prepared by three different sintering techniques

Author

Dahl, P., Kaus, I., Zhao, Z., Johnsson, M., Nygren, M., Wiik, K., Grande, T., and Einarsrud, M.-A.

Subjects
*SINTERING, *ZIRCONIUM oxide, *CRYSTALS, *METAL powders, *GLYCINE, *NITRATES, *COMBUSTION
Abstract

Abstract: Densification of nanocrystalline yttria stabilized zirconia (YSZ) powder with 8mol% Y2O3, prepared by a glycine/nitrate smoldering combustion method, was investigated by spark plasma sintering, hot pressing and conventional sintering. The spark plasma sintering technique was shown to be superior to the other methods giving dense materials (≥96%) with uniform morphology at lower temperatures and shorter sintering time. The grain size of the materials was 0.21, 0.37 and 12μm after spark plasma sintering, hot pressing and conventional sintering, respectively. Total electrical conductivity of the materials showed no clear correlation with the grain size, but the activation energy for spark plasma sintered materials was slightly higher than for materials prepared by the two other densification methods. The hardness, measured by the Vickers indentation method, was found to be independent on grain size while fracture toughness, derived by the indentation method, was slightly decreasing with increasing grain size. [Copyright &y& Elsevier]

Published
2007
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12. High temperature transport kinetics in heteroepitaxial LaFeO3 thin films

Author

Hole, I., Tybell, T., Grepstad, J.K., Wærnhus, I., Grande, T., and Wiik, K.

Subjects
*LANTHANUM compounds, *EPITAXY, *CRYSTAL growth, *MAGNETRONS
Abstract

Heteroepitaxial LaFeO3(1 1 0) thin films with a thickness of 150 nm were grown on LaAlO3(0 0 1) by reactive sputtering in an inverted cylindrical magnetron geometry. Equilibrium conductivity was measured as a function of partial pressure of oxygen at T=1000 °C, and logσ plotted vs. logP(O2) showed a minimum in conductivity for P(O2)=10−11 atm and a linear response between 10−10 and 1 atm. This linear response makes thin films of LaFeO3 a promising material for oxygen sensor applications. We have also measured the time response of the film conductivity upon an abrupt change in the partial pressure of ambient oxygen from 10−2 to 10−3 atm, which was determined at 60 s for T=700 °C and <3.5 s at T=1000 °C. [Copyright &y& Elsevier]

Published
2003
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