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Sökning: WFRF:(Li M) > Högskolan Väst

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1.
  • Li, C., et al. (författare)
  • Precise strain profile measurement as a function of depth in thermal barrier coatings using high energy synchrotron X-rays
  • 2016
  • Ingår i: Scripta Materialia. - : Elsevier BV. - 1359-6462 .- 1872-8456. ; 113, s. 122-126
  • Tidskriftsartikel (refereegranskat)abstract
    • We have developed a method of directly measuring the strain gradient as a function of depth in plasma sprayed Thermal Barrier Coatings (TBCs). A 92.8 keV monochromatic synchrotron X-ray beam was used to penetrate the 10 × 10 × 8 mm samples in transmission geometry. The samples had been heated to 1150 °C and held at that temperature for 190 h. The diffraction patterns were collected using a DECTRIS pilatus3 X CdTe 300 K area detector. The patterns were analyzed by partial circular integration followed by full Rietveld refinement to obtain the lattice parameters of the TBC top coat at 25 μm intervals as function of depth. The coatings surviving the heat treatment process without significant damage were found to exhibit a variable compressive stress state inside the top coat. This was found to be about − 600 MPa at the bond coat interface decreasing in a non-linear fashion towards the surface. By refinement of the data collected from sectors of whole Debye Scherrer rings we were able to estimate both the in-plane and out-of-plane strain.
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2.
  • Huang, Li, et al. (författare)
  • Measurement invariance of discipline in different cultural contexts
  • 2012
  • Ingår i: Family Science. - 1942-4620 .- 1942-4639. ; 2:3, s. 212-219
  • Tidskriftsartikel (refereegranskat)abstract
    • The measurement invariance of mother-reported use of 18 discipline strategies was examined in samples from 13 different ethnic/cultural groups in nine countries (China, Colombia, Italy, Jordan, Kenya, the Philippines, Sweden, Thailand, and the United States). Participants included approximately 100–120 mothers and their children aged seven to 10 years from each group. The results of exploratory factor analyses and multi-group categorical confirmatory factor analyses (MCCFA) indicated that a seven-factor solution was feasible across the cultural groups, as shown by marginally sufficient evidence for configural and metric invariance for the mother-reported frequency on the discipline interview. This study makes a contribution on measurement invariance to the parenting literature, and establishes the mother-report aspect of the discipline interview as an instrument for use in further cross-cultural research on discipline.
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