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Your search keyword '"Glowacki, B."' showing total 340 results
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340 results on '"Glowacki, B."'

52. The synergistic effect of cobalt oxide and Gd-CeO2 dual infiltration in LSCF/CGO cathodes.

Author

Tomov, R. I., Mitchel-Williams, T. B., Maher, R., Kerherve, G., Cohen, L., Payne, D. J., Kumar, R. V., and Glowacki, B. A.

Abstract

La0.6Sr0.4Co0.2Fe0.8O3−δ/Ce0.9Gd0.1O1.9 composite cathodes were nano-engineered via“dual” inkjet printing infiltration of nitrate salt solutions in a single step procedure. After calcination in air at 700 °C the cathodes were decorated with Ce0.9Gd0.1O1.9 and CoxOy nanoparticles (∼20 nm in size). The effects of the as-created nano-decoration on the electrochemical activity and the performance stability in the intermediate temperature range (500–700 °C) were investigated. The nano-engineered microstructure was found to extend the active three-phase boundary and to promote adsorption–dissociation–surface exchange reactions. Electrochemical impedance tests conducted on symmetric cells showed a reduction in the polarisation resistance of between 1.5 and 7.0 times depending on temperature (500–700 °C). High-resolution X-ray photoelectron spectroscopy and in situ high temperature Raman spectroscopy were used to study aging and thermal cycling effects on the cathodes' surface chemistry. Aging tests of the infiltrated electrodes up to 100 hours in air revealed an enhanced stability of the decorated electrodes ascribed to the suppression of SrO surface segregation. This work demonstrated that the sequence of infiltration of both inks introduces noticeable differences in the oxygen reduction reaction. [ABSTRACT FROM AUTHOR]

Published
2018
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53. A Numerical Study To Investigate Magnetization, Current Density And Trapped Field Properties Of Doped-Sm123 Bulk Superconductor Under Different Magnetic Fields

Author

Ozturk, K., Patel, A., and Glowacki, B. A.

Subjects
Condensed Matter::Superconductivity
Abstract

In this study, an FEM code based on a critical state model is used to further understand the electromagnetic behaviour of Yb211-doped Sm123 bulk superconductor by calculating the current and magnetic field distributions in doped samples both in uniform and non-uniform external field conditions. The results of magnetization loops from the numerical modelling have been compared with experimental results and they show a good match. In the numerical calculation result, the highest trapped field value, B-z, is 0.49 T for x = 0.25. In addition, the value of Bz trapped field in a non-uniform applied field is calculated as 18% larger than in uniform applied field and the current density of samples as a function of radius increase particularly at the sample edge with a non-uniform applied field for the x = 0.25 sample. It can be said that this numerical method will be a useful candidate to get an easy solution to many electromagnetic problems of doped-superconductor with complex geometries and in different field conditions as the performed numerical study is successful in clarifying magnetization, trapped field and pinning properties of Yb211-doped Sm123 superconductor. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Published
2012

63. Inkjet printing infiltration of Ni-Gd:CeO2 anodes for low temperature solid oxide fuel cells.

Author

Wang, C., Tomov, R., Mitchell-Williams, T., Kumar, R., and Glowacki, B.

Subjects
ANODES, POLYELECTROLYTES, FUEL cells, GAS dynamics, ISOTHERMAL processes
Abstract

The effect of inkjet printing infiltration of Gd0.1Ce0.9O2-x in NiO-Gd0.1Ce0.9O2-x anodes on the performance of symmetrical and button cells was investigated. The anodes were fabricated by inkjet printing of suspension and sol inks. Symmetrical cells were produced from composite suspension inks on Gd0.1Ce0.9O2-x electrolyte. As-prepared scaffolds were infiltrated with Gd0.1 Ce0.9O2 ink. Increasing the number of infiltration steps led to formation of ‘‘nano-decoration’’ on pre-sintered anodes. High resolution SEM analysis was employed for microstructural characterization revealing formation of fine anode sub-structure with nanoparticle size varying in the range of 50–200 nm. EIS tests were conducted on symmetrical cells in 4% hydrogen/argon gas flow. The measurements showed substantial reduction of the activation polarization as a function of the number of infiltrations. The effect was assigned to the extension of the triple phase boundary. The i–V testing of a reference (NiO-8 mol% Y2O3 stabilized ZrO2/NiO-Gd0.1Ce0.9O2-x/Gd0.1Ce0.9O2-x/Gd0.1Ce0.9O2-x-La0.6Sr0.4Co0.2Fe0.8O3-δ) cell and an identical cell with infiltrated anode revealed ~2.5 times improvement in the maximum output power at 600 °C which corresponded with the reduction of the polarization resistance of the symmetrical cells at the same temperature (2.8 times). This study demonstrated the potential of inkjet printing technology as an infiltration tool for cost effective commercial SOFC processing. [ABSTRACT FROM AUTHOR]

Published
2017
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66. Inkjet printing of multifilamentary YBCO for low AC loss coated conductors

Author

Hopkins, S C, primary, Joseph, D, additional, Mitchell-Williams, T B, additional, Calleja, A, additional, Vlad, V R, additional, Vilardell, M, additional, Ricart, S, additional, Granados, X, additional, Puig, T, additional, Obradors, X, additional, Usoskin, A, additional, Falter, M, additional, Bäcker, M, additional, and Glowacki, B A, additional

Published
2014
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70. Transport AC Losses in Striated YBCO Coated Conductors (Postprint)

Author

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/POWER DIV/MECHANICAL ENERGY CONVERSION BRANCH, Levin, G A, Barnes, P N, Majoros, M, Glowacki, B A, Campbell, A M, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/POWER DIV/MECHANICAL ENERGY CONVERSION BRANCH, Levin, G A, Barnes, P N, Majoros, M, Glowacki, B A, and Campbell, A M

Abstract

DC current-voltage characteristics and transport ac losses of striated and non-striated Y1Ba2Cu3O7-delta (YBCO) coated conductors have been measured. Transport ac loss measurements have been performed in frequencies from 40 Hz up to 2 kHz at 77.4 K. Degradation in the critical current of about 40% due to the laser striation process has been found. The striated sample was much more thermally stable than the non-striated one. Transport ac losses were weakly frequency dependent up to 2 kHz, and mainly determined by the losses in the substrate and Ni layer up to currents of about 50% of the critical current. Striation had no effect on normalized transport ac losses, which are basically hysteretic. Comparison of transport ac losses with in-field losses showed that the dominant loss contribution is the in-field loss., Conference paper published in the Proceedings of the 7th European Conference on Applied Superconductivity in the Journal of Physics: Conference Series, v43, 2006. Sponsored in part by AFOSR Contract no. FA8655-04-1-3033.

Published
2012

77. Pinning Improvement of A15 Applied Superconducting Materials.

Author

GLOWACKI, B. A.

Subjects
*ELECTRON-phonon interactions, *SUPERCONDUCTORS, *CRYOMAGNETISM, *FLUX pinning, *HYDROGEN
Abstract

Electron-phonon coupling is one of the most common interaction in superconducting materials ranging from Nb3Sn, MgB2, iron-based superconductors and high temperature cuprates such as YBa2Cu3O7-δ and HgBa2Ca2Cu3O8+δ. However an importance of the electron-phonon coupling constant, λep, should not be underestimated for characterisation of the electronic properties of superconducting materials, but it is important that the enhanced flux pinning mechanism can be hold responsible for the applicability of the A15 superconducting materials in emerging hydrogen cryomagnetic technology where temperature of the liquid H2 can be as low as 14 K. [ABSTRACT FROM AUTHOR]

Published
2016
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79. Effect of heating rates on superconducting properties of pure MgB2, carbon nanotube- and nano-SiC-doped in situ MgB2/Fe wires

Author

Chen, S. K., Tan, K. S., Glowacki, B. A., Yeoh, W. K., Soltanian, Saeid, Horvat, J., Dou, S. X., Chen, S. K., Tan, K. S., Glowacki, B. A., Yeoh, W. K., Soltanian, Saeid, Horvat, J., and Dou, S. X.

Abstract

The influence of heating rates and annealing temperatures on the transition temperatures (Tc) and critical current densities (Jc) of pure MgB2, carbon nanotube- and nano-SiC-doped in situ monofilamentary MgB2/Fe wires was investigated. It was found that higher Jc was obtained for pure MgB2 samples when heat treated with slower heating rates. SiC-doped samples also have higher Jc with slower heating rates, but the Jc is less sensitive to annealing temperatures. However, the Jc of the carbon nanotube-doped wire was found to be insensitive to heating rates. The variation in Tc and Jc with heating rate, and the different behaviors of differently doped MgB2/Fe wires, make it essential to carefully select the optimum heating rates for heat treatment.

Published
2005

84. Extension to AC Loss Minimisation in High Temperature Superconductors

Author

CAMBRIDGE UNIV (UNITED KINGDOM) INTERDISCIPLINARY RESEARCH CENTRE IN SUPER CONDUCTIVITY, Campbell, Archie M., Majoros, M., Glowacki, B. A., CAMBRIDGE UNIV (UNITED KINGDOM) INTERDISCIPLINARY RESEARCH CENTRE IN SUPER CONDUCTIVITY, Campbell, Archie M., Majoros, M., and Glowacki, B. A.

Abstract

This report results from a contract tasking University of Cambridge as follows: The contractor will investigate: (a) Measure the AC losses of appropriate Yttrium Barium Copper Oxide (YBCO) samples with strong potential for minimizing losses at high frequencies and magnetic fields with the existing equipment. (b) Design apparatus which will reproduce the conditions met in lightweight generators and motors in variable temperatures. (c) Extend the critical state model for superconductors to include the dependence of critical current density on magnetic field. (d) Model AC losses of multi-filamentary tapes with filaments connected at their ends by their current leads and determine the effects of filament transposition and/or twisting. (e) Measure and assess the percolation of electrical superconducting currents through the narrow YBCO filaments required for minimizing AC loss. (f) Establish a superconductor processing methodology to minimize AC loss in long lengths of YBCO conductor and model the behavior of the superconductor as part of a complete machine.

Published
2004

86. Ink Jet Printing for Functional Ceramic Coatings

Author

Vilardell, M., primary, Cobas, R., additional, Arjona, M., additional, Puig, T., additional, Obradors, X., additional, Hopkins, S., additional, Glowacki, B., additional, Bennewitz, J., additional, Falter, M., additional, Bäcker, M., additional, Granados, X., additional, and Ricart, S., additional

Published
2011
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89. AC Loss Minimization in High Temperature Superconductors - U.K.

Author

CAMBRIDGE UNIV (UNITED KINGDOM), Campbell, Archie M., Majoros, M., Glowacki, B. A., CAMBRIDGE UNIV (UNITED KINGDOM), Campbell, Archie M., Majoros, M., and Glowacki, B. A.

Abstract

This report results from a contract tasking University of Cambridge as follows: The contractor will investigate yttrium-barium-copper oxide (YBCO) coatings divided into filaments with various widths and separations. AC loss measurements as well as magnetization measurements will be conducted. Experimental results will then be compared with the theoretical models and predictions. Finally, the experimental and theoretical results will be compared with the Slovakian research group results (SPC 014027).

Published
2003

94. Ink-jet printing for ceramic functional coating

Author

Granados, X., primary, Ricart, S., additional, Cobas, R., additional, Vilardell, M., additional, Arjona, M., additional, Puig, T., additional, Obradors, X., additional, Hopkins, S., additional, and Glowacki, B., additional

Published
2010
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95. Extension to AC Loss Minimization in High Temperature Superconductors

Author

CAMBRIDGE UNIV (UNITED KINGDOM) INTERDISCIPLINARY RESEARCH CENTRE IN SUPER CONDUCTIVITY, Campbell, A. M., Majoros, M., Glowacki, B. A., CAMBRIDGE UNIV (UNITED KINGDOM) INTERDISCIPLINARY RESEARCH CENTRE IN SUPER CONDUCTIVITY, Campbell, A. M., Majoros, M., and Glowacki, B. A.

Abstract

In this period of research we concentrated our efforts on AC loss measurements of YBCO coated conductors on textured metallic substrates made in Cambridge. Several samples were prepared by pulsed laser deposition on two different substrates: NiFe and the recently developed NiCrW. The samples differed in sintering conditions and in buffer structures. The two best samples - with the highest critical temperature - on two different substrates were chosen for the AC loss study. The onset critical temperature of both the samples was 85 K, however zero resistance was at about 20 K, i.e., the transitions were very broad. For this reason we decided to perform loss measurements at 5 K using a SQUID magnetometer, since the high frequency equipment will not go down to this temperature., The original document contains color images.

Published
2002

100. HTS magnet for 7.3 kJ SMES system

Author

Wojtasiewicz, G, primary, Janowski, T, additional, Kozak, S, additional, Kondratowicz-Kucewicz, B, additional, Kozak, J, additional, Surdacki, P, additional, and Glowacki, B A, additional

Published
2006
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