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RISS 인기검색어
- 검색키워드
- 저자 : Mei-Hwa Tai (검색결과 2 건)
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Synthesis of Spherical Zirconia by Reverse Emulsion Precipitation : Effects of Surfactant Type
Lee, Mei Hwa,Tai, Clifford L .,Lu, Chung Hsin 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6
Spherical ZrO₂ microparticles were prepared in a three-phase reactor by mixing two water-in-oil emulsions with normal heptane as oil phase and aqueous solutions of zirconium oxyacetate and ammonia as water phases, respectively. The principal factors that influenced the stability of emulsion were investigated, including the surfactant type, the volume of w/o, and the concentration of zirconium ion. In this work, four anion surfactants were tested, including Span 85, Arlacel 83, Span 80 and Span 40. The most stable reverse emulsions were obtained with the surfactant Span 40. When w/o volume ratio was kept 1/100 using Span 40 or Span 80 as a surfactant, the ZrO₂ microparticles with spherical morphology were successfully prepared in the reverse emulsions at various Zr^(4+) concentrations (from 0.5M to 3M). The particle sizes of ZrO₂ are smaller for Span 40 as compared with Span 80 on the same Zr^(4+) concentrations. The crystalline phase of the ZrO₂ powders after calcination at 750℃ for 2h was tetragonal.
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Yu-Sen Huang,Hsao-Hsun Hsu,Jo-Yu Chen,Mei-Hwa Tai,Fu-Shan Jaw,Yeun-Chung Chang 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.6
Objective: This study strived to evaluate the relationship between degree of pulmonary emphysema and cardiac ventricular function in chronic obstructive pulmonary disease (COPD) patients with pulmonary hypertension (PH) using electrocardiographic-gated multidetector computed tomography (CT). Materials and Methods: Lung transplantation candidates with the diagnosis of COPD and PH were chosen for the study population, and a total of 15 patients were included. The extent of emphysema is defined as the percentage of voxels below -910 Hounsfield units in the lung windows in whole lung CT without intravenous contrast. Heart function parameters were measured by electrocardiographic-gated CT angiography. Linear regression analysis was conducted to examine the associations between percent emphysema and heart function indicators. Results: Significant correlations were found between percent emphysema and right ventricular (RV) measurements, including RV end-diastolic volume (R2 = 0.340, p = 0.023), RV stroke volume (R2 = 0.406, p = 0.011), and RV cardiac output (R2 = 0.382, p = 0.014); the correlations between percent emphysema and left ventricular function indicators were not observed. Conclusion: The study revealed that percent emphysema is correlated with RV dysfunction among COPD patients with PH. Based on our findings, percent emphysema can be considered for use as an indicator to predict the severity of right ventricular dysfunction among COPD patients.
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