http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Mechanical Behavior of Directionally Solidified (Y2O3)ZrO2/Al2O3 Eutectic Fibers
박덕용,Jenn-Ming Yang 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.1
The microstructural features and mechanical behavior of directionally solidified (Y2O3)ZrO2/Al2O3 eutectic fibers after extended heat treatment in oxidizing environment were investigated. The fiber was grown continuously by an edge-defined film-fed growth (EFG) technique. The microstructure was characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microstructure of the fiber in the as-fabricated state consists of highly oriented colony and fine lamellar microstructure along the fiber axis. Tensile strength of the (Y2O3)ZrO2/Al2O3 eutectic fiber remained unchanged with heat treatment at temperatures between 1200C and 1500C up to 300hrs. The Weibull’s modulus remained fairly constant after extended thermal exposure. The fracture toughness and crack propagation behavior were investigated. The fracture toughness (K1C) of the (Y2O3)ZrO2/Al2O3 eutectic fiber in the as-fabricated state were measured to be 3.60.5 MPam1/2 by an indentation technique and 2.20.2 MPam1/2 by assuming elliptical flaw of a semi-infinite solid, respectively. The (Y2O3)ZrO2/Al2O3 eutectic fiber showed a radial (Palmqvist) crack type and exhibited an orthotropic crack growth behavior under 100g load.
Deng-Ho Yang,Deh-Ming Chang,Jenn-Haung Lai,Fu-Huang Lin,Chen-Hung Chen 연세대학교의과대학 2010 Yonsei medical journal Vol.51 No.6
Purpose: To distinguish lupus flare-up from infection in systemic lupus erythematosus (SLE), we analyze the expression of circulating CD27 high plasma cells in SLE patients with and without infection, in comparison to non-SLE patients with infection. Materials and Methods: The percentage of circulating CD27 high plasma cells was measured by flow cytometry in the following four groups: 36 SLE patients without infection, 23 SLE patients with infection, eight non-SLE patients with infection, and 26 healthy controls. Results: The frequency of CD27high plasma cells had a correlation with the SLE disease activity index (SLEDAI) (r = 0.866, p < 0.05), level of anti-dsDNA (r = 0.886, p < 0.05), C3 (r = - 0.392, p < 0.05), and C4(r = - 0.337, p < 0.05) in SLE patients without infection, but there was no correlation with disease activity in SLE patients with infection. Among three groups in particular-SLE without infection, SLE with infection, and non-SLE with infection-the percentages of CD27 high plasma cells were elevated. The percentage of CD27high plasma cells was higher in SLE patients with infection, when compared to SLE patients without infection. Conclusion: The percentage of CD27high plasma cells is a biomarker for disease activity of SLE without infection, under correlation with SLEDAI, anti-dsDNA, and C3 and C4 level. However, when the SLE patients have an infection, the percentage of CD27 high plasma cells is not an adequate biomarker for the survey of disease activity. The percentage of CD27 high plasma cells may serve as a potential parameter to distinguish a lupus flare-up from infection.
Park, Deok-Yong,Yang, Jenn-Ming The Korean Ceramic Society 2004 한국세라믹학회지 Vol.41 No.1
The microstructural features and mechanical behavior of directionally solidified $(Y_2O_3)ZrO_2/Al_2O_3$ eutectic fibers after extended beat treatment in oxidizing environment were investigated. The fiber was grown continuously by an Edge-defined Film-fed Growth (EFG) technique. The microstructure was characterized using X-Ray Diffraction (XRD) and Scanning Electron Microscopy(SEM). The microstructure of the fiber in the as-fabricated state consists of highly oriented colonv and fine lamellar microstructure along the fiber axis. Tensile strength of the $(Y_2O_3)ZrO_2/Al_2O_3$ eutectic fiber remained unchanged with heat treatment at temperatures between $1200^{\circ}C$ and $1500^{\circ}C$ up to 300h. The weibulls modulus remained fairly constant after extended thermal exposure. The fracture toughness and crack propagation behavior were investigated. The fracture toughness ($K_{1C}$) of the $(Y_2O_3)ZrO_2/Al_2O_3$ eutectic fiber in the as-fabricated state were measured to be 3.6 ${\pm}$ 0.5 MPa${\cdot}m^{1/2}$ by an indentation technique and 2.2 ${\pm}$ 0.2 MPa${\cdot}m^{1/2}$ by assuming elliptical flaw of a semi-infinite solid, respectively. The $(Y_2O_3)ZrO_2/Al_2O_3$ eutectic fiber showed a radial (Palmqvist) crack type and exhibited an orthotropic crack growth behavior under 100 g load.