Both clustering and optimization enabled better representation of tooth color as compared with an existing dental shade guide. Optimization outperformed clustering and is therefore recommended as a method of choice for representation of tooth color and designing of dental shade guides.

Within the limitations of this study, both main effects of threshold type (perceptibility and acceptability) and primary color (light and dark) on 50:50% color-difference thresholds of colored maxillofacial elastomers were found significant for both color-difference formulae used (CIELAB, CIEDE2000). In addition, significant interaction between the two main effects was found, indicating a stronger effect of skin type on acceptability than perceptibility thresholds. Primary specimen color (light vs. dark) was found to be the only significant main effect on the AUC of ROC curves constructed from logistic regression.

The critical current and structural properties of (Gd,Y)BaCuO tapes made by metal organic chemical vapor deposition (MOCVD) with Zr addition levels up to 30 at.% have been investigated. The reduction in critical current beyond the previously optimized Zr addition level of 7.5 at.% was found to be due to structural deterioration of the (Gd,Y)Ba 2 Cu 3 O x film. By a modified MOCVD process, enhanced critical current densities have been achieved with high levels of Zr addition, including 3.83 MA cm −2 in 15 at.% Zr-added 1.1 µm thick film at 77 K in zero magnetic field. Critical currents as high as 1072 A/12 mm have been reached in (Gd,Y)BaCuO tapes with 15 at.% Zr addition at 30 K in a field of 3 T applied perpendicular to the tape, corresponding to a pinning force value of 268 GN m −3 . The enhanced critical currents achievable with a high density of nanoscale defects by employing high levels of second-phase additions enable the performance targets needed for the use of HTS tapes in coil applications involving high magnetic fields at temperatures below 50 K to be met.

Engineering current density over 5 kA mm −2 at 4.2 K, 14 T in thick film REBCO tapes To cite this article: Goran Majkic et al 2018 Supercond. Sci. Technol. 31 10LT01 View the article online for updates and enhancements. Related content Critical current density above 15 MA cm2 at 30 K, 3 T in 2.2 m thick heavily-doped (Gd,Y)Ba2Cu3Ox superconductor tapes V Selvamanickam, M Heydari Gharahcheshmeh, A Xu et al.-Sample and length-dependent variability of 77 and 4.2 K properties in nominally identical RE123 coated conductors L Rossi, X Hu, F Kametani et al.-Requirements to achieve high in-field critical current density at 30 K in heavilydoped (Gd,Y)Ba2Cu3Ox superconductor tapes V Selvamanickam, M Heydari Gharahcheshmeh, A Xu et al.-Recent citations Goran Majkic-Correlation of In-Field Performance of Thick REBCO Films Between 0-14 T and 4.2-77 K Goran Majkic et al-Effect of Deposition Temperature on Microstructure and Critical Current Properties of Zr-Doped GdYBCO Superconducting Tapes Made by MOCVD Ziming Fan et al