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A largely ignored stress contribution is the difference in coefficient of hygroscopic expansion between the coating and substrate.
The difference in coefficient of thermal expansion, together with thermal and thermal mechanical loading are the main driving forces for interfacial delamination.
The thermal stress mismatch instigated through the difference in coefficient of thermal expansion (CTE) between discrete YSZ and LaMgAl11O19 layers led to the failure of the as-sprayed DC-TBC.
The change in the regression coefficients was evaluated by using the difference in coefficient method, as proposed by Freedman et al (27).
Gene BTS2 was differentially expressed but did not show significant difference in coefficient of the ODE between tumor and normal samples.
Very close correlations were demonstrated with both the high-CVP group (>12 mm Hg; n = 13, r = 0.94, P < 0.01) and the low-CVP group (≤12 mm Hg; n = 17, r = 0.89, P < 0.01), with no statistical difference in coefficient of correlation (P = 0.12).
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In the formal sector, this difference in coefficients (unexplained part) exists neither for experience nor for any other variable.
We show both OLS and FE results since Hausman tests point out a systematic difference in coefficients in all the regressions.
Running Hausman specification tests showed that there is no significant systematic difference in coefficients as a result of exclusion of these variables.
Table 11 Hausman test for random versus fixed effects Chi2 p value Balance 17.050 0.148 Revenues 28.350 0.005 Expenses 53.780 0.000 H0: Difference in coefficients not systematic.
We note that, despite the smallness of difference in coefficients illustrated by Fig. 8, a few small scale anomalies may reach a notable amplitude.
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