Developments in Ceramic Materials Research

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22 Leslie G. Cecil Table 3. Mahalanobis Distance Calculation for the Clay Samples Projected against the Non-Ash Paste Group Clay Samples Probability of Membership in Non-ash Paste group LGC110 0.047 LGC111 0.000 LGC112 0.002 LGC113 2.867 LGC114 0.025 LGC115 0.453 LGC116 0.313 LGC117 0.764 LGC119 0.000 Figure 9. Plot of chromium and barium base-10 logged concentrations demonstrating the possible membership of the white clay samples (identified by sample number) in the two basic Clemencia Cream Paste ware compositional groups (ash tempered and non-ash tempered). Samples were analyzed by INAA. Ellipses represent 90% confidence intervals for group membership. The clay samples consistently plot within the ellipse (90% confidence interval) that represents pottery from Ch’ich’ (Figure 10). Unfortunately, the small sample size of the pottery does not allow for statistical testing; however, because the clay samples always plot within this sherd group, I am confident that they represent the clays used for some sherds manufactured at Ch’ich’. None of the collected gray clay samples correspond to the Snail- Inclusion Paste ware sherds.
Postclassic Maya Ceramic Advances 23 Figure 10. Plot of chromium and cerium base-10 logged concentrations demonstrating the possible membership of the orange-red clay samples (identified as +) within the non-ash paste Vitzil Orange- Red ware compositional group. Samples were analyzed by INAA. Ellipses represent 90% confidence intervals for group membership. In addition to ceramic paste analyses, understanding the differences in exterior slips and the various pigments used for the painted decoration of the Postclassic slipped pottery is important to this study and could only be achieved through chemical analysis. Petrographic analysis did include an examination of the slips; however, no obvious differences in the kinds of slips being used for different types of pottery were detectable. Clemencia Cream Paste ware exterior slips divide into three different chemical compositional groups. One of the exterior slip groups corresponds to the Clemencia Cream Paste ware volcanic ash tempered group. The other two slip groups correspond to pottery excavated from Zacpetén and Tipuj (Cecil and Neff 2006:1487) and the slips excavated from Tipuj are thinner and of a poorer quality (fireclouding and matte finish) than those excavated from structures at Zacpetén. Exterior slips of the Vitzil Orange-Red ceramic group form two main groups with some outlierers (Figure 11). The two slip groups correspond to archaeological sites from the western lakes region (Ch’ich’ and Ixlú) and those from the eastern lakes region (Red Slip Group B—Zacpetén and Tipuj). The outliers represent decorated sherds from the eastern lakes. The slips from the western lakes region are thicker, have a glossy finish, and the sherds are generally not decorated. These slips correspond to the paste group discussed above from Ch’ich’ further suggesting that there was a manufacturing zone for Vitzil Orange-Red pottery at or near the archaeological site of Ch’ich’. Snail-Inclusion Paste ware exterior slips as a whole (pink, red, and black) do not form any statistically significant compositional groups; however, the Trapeche “pink” exterior slips separate into two chemical compositional groups that are statistically significant (Figure 12) (Cecil and Neff 2006:1487-1488). Group 1 is composed primarily of pink double-slipped pottery from Zacpetén and Group 2 contains the same kind of slipped pottery primarily from
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Page 9 and 10: PREFACE Ceramics are refractory, in
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Page 16 and 17: 2 Leslie G. Cecil comprehensive dat
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78 k, cm -1 20 18 16 14 12 10 8 6 4
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84 Fluorescence, a.u. I transfer ,
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86 ln(I transfer (t)) -4.2 -4.4 -4.
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IACC ( τ ) = t2 ∫ The Use of Cer
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D50 0.8 0.7 0.6 0.5 0.4 0.3 The Use
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Definition (D50) 1 0.95 0.9 0.85 0.
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212 R. Ramesh, H. Kara, Ron Stevens
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242 Development of Display Technolo
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244 Li Chen technology moved to the
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246 Li Chen The continuing evolutio
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248 Li Chen the back contact cathod
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250 Li Chen Figure 3. Vertical side
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252 Li Chen Figure 6. Molybdenum mi
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254 Li Chen Figure 8(a). I-V curve
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256 Li Chen Figure 9. Life time tes
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258 Figure 11(a). Plasma generated
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260 Li Chen [13] C.A. Spindt, K.R.
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262 S. Ardizzone, C. L. Bianchi, G.
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A absorption spectra, 66, 67, 77, 7
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correlation function, 156 corrosion
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group membership, 13, 20, 21, 22, 2
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microstructure(s), x, xi, 73, 74, 2
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time, vii, ix, 1, 3, 7, 8, 11, 26,
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