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- 저자 : Huijuan Qiu (검색결과 3 건)
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Huijuan Qiu,Hongkang Wei,Shifeng Ren,Lingjun Sun,Jia Li,Zihan Wang,Lin Zhao,Chang-an Wang,Zhipeng Xie 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
Titanium carbide powders were synthesized under an argon atmosphere using titanium dioxide and pyrolysis carbon derivedfrom pyrolyzed phenolic resin as raw materials. The effects of synthesis temperature, holding time, and C/Ti molar ratio onthe phase composition and morphology of the synthesized powders were investigated. The results show that the pyrolyzedphenolic resin at 1000 ℃ is a carbon source composed of amorphous and crystalline carbon. Increasing the C/Ti molar ratio ofthe mixed powder can reduce the content of titanium oxide impurity, indicating the improvement in the purity of TiC powder. In addition, the C/Ti molar ratio can also significantly affect the morphology of the synthesized TiC powders. SEM and EDSresults exhibit that the atomic content on the surface of TiC particles is closely correlated with the atomic distribution on thesurface of the particles. TiC powder with a median particle size of 384 nm could be synthesized at 1500 ℃ for 30 min at the C/Ti molar ratio of 2.3:1. In addition, the sinterability of the synthesized TiC powder was preliminarily discussed. The hardnessand fracture toughness of the TiC ceramic sintered at 2000 ℃ under 40 MPa with a dwell time of 2 h are 15.92 GPa and 3.22MPa·m1/2, respectively.
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Haozhan Lia,Hongkang Wei,Huijuan Qiu,Yukang Wanga,Chang-an Wang,Zhipeng Xie 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
Sub-micron boron carbide powders were synthesized through a gas-solid reaction process using ZIF-8-derived nanoporouscarbon and boron oxide as raw materials. The effects of calcination temperature and atmosphere, amount of boron oxide, andgas-solid reaction apparatus on phase composition and morphology of the synthesized boron carbide powders were studied. The results show that, even with sufficient boron oxide addition, it is not feasible to obtain boron carbide powder of high purityin argon environment. Although vacuum environment can significantly improve the purity of the synthesized boron carbidepowder, there are a large number of large particles of step morphology in the synthesized boron carbide powder. The improvedgas-solid reaction apparatus can effectively impede the formation of boron carbide particles of step morphology. Nearlyspherical submicron boron carbide particles with a median particle size of 480 nm and good particle size consistency couldbe synthesized at 1600 °C with 0.3 g nanoporous carbon and 10 g B2O3 under vacuum by using the improved apparatus
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Mu Danni,Fang Jiadan,Yu Songlin,Ma Yichen,Cheng Jin,Hu Yingying,Song Ailing,Zhao Fang,Zhang Qi,Qi Zhihong,Zhang Kui,Xia Liangyu,Qiu Ling,Zhu Huijuan,Cheng Xinqi 대한진단검사의학회 2024 Annals of Laboratory Medicine Vol.44 No.1
Background: Twenty-four-hour urinary free cortisol (UFC) measurement is the initial diagnostic test for Cushing’s syndrome (CS). We compared UFC determination by both direct and extraction immunoassays using Abbott Architect, Siemens Atellica Solution, and Beckman DxI800 with liquid chromatography-tandem mass spectrometry (LC-MS/MS). In addition, we evaluated the value of 24-hr UFC measured by six methods for diagnosing CS. Methods: Residual 24-hr urine samples of 94 CS and 246 non-CS patients were collected. A laboratory-developed LC-MS/MS method was used as reference. UFC was measured by direct assays (D) using Abbott, Siemens, and Beckman platforms and by extraction assays (E) using Siemens and Beckman platforms. Method was compared using Passing–Bablok regression and Bland–Altman plot analyses. Cut-off values for the six assays and corresponding sensitivities and specificities were calculated by ROC analysis. Results: Abbott-D, Beckman-E, Siemens-E, and Siemens-D showed strong correlations with LC-MS/MS (Spearman coefficient r=0.965, 0.922, 0.922, and 0.897, respectively), while Beckman-D showed weaker correlation (r=0.755). All immunoassays showed proportionally positive bias. The areas under the curve were 0.975 for Abbott-D, 0.972 for LC-MS/MS, 0.966 for Siemens-E, 0.948 for Siemens-D, 0.955 for Beckman-E, and 0.877 for Beckman-D. The cut-off values varied significantly (154.8–1,321.5 nmol/24 hrs). Assay sensitivity and specificity ranged from 76.1% to 93.2% and from 93.0% to 97.1%, respectively. Conclusions: Commercially available immunoassays for measuring UFC show different levels of analytical consistency compared to LC-MS/MS. Abbott-D, Siemens-E, and Beckman-E have high diagnostic accuracy for CS.
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