http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Parra-Medina, Deborah (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Photo-catalysis of phenol derivatives with Fe2O3 nanoparticles dispersed on SBA-15
E. Montiel-Palacios,A. K. Medina-Mendoza,A. Sampieri,C. Angeles-Chávez,I. Hernández-Pérez,R. Suarez-Parra 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
Highly ordered hexagonal (p6mm) mesoporous silica SBA-15 was synthesized through a hydrothermal treatment under acidic conditions. Fe2O3/SBA-15 catalysts were prepared by impregnation of SBA-15 media with iron(III) acetylacetonate, iron(III) chloride or iron(II) sulfate solutions. X-ray Diffraction (XRD), X-ray fluorescence (XRF), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray (EDX) spectroscopy and nitrogen physisorption characterization were carried out for SBA-15 and Fe2O3/SBA-15 materials. After impregnation and calcination at 823 K, the iron oxide dispersion in SBA-15 was analyzed by STEM and EDX. FeCl3 provides the highest amount of Fe loading in mesoporous SBA-15. The photocatalytic properties of Fe2O3/SBA-15 samples at pH = 3 and pH = 6 were evaluated in catechol and hydroquinone photodecomposition by inducing visible radiation. The conversion of catechol and hydroquinone, at pH = 3 and pH = 6 with iron(III) acetylacetonate and FeCl3 as the precursor of iron oxide nanoparticles, were measured by UV-Vis spectroscopy, chemical oxygen demand (COD) and total organic carbon (TOC) analysis. Highly ordered hexagonal (p6mm) mesoporous silica SBA-15 was synthesized through a hydrothermal treatment under acidic conditions. Fe2O3/SBA-15 catalysts were prepared by impregnation of SBA-15 media with iron(III) acetylacetonate, iron(III) chloride or iron(II) sulfate solutions. X-ray Diffraction (XRD), X-ray fluorescence (XRF), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray (EDX) spectroscopy and nitrogen physisorption characterization were carried out for SBA-15 and Fe2O3/SBA-15 materials. After impregnation and calcination at 823 K, the iron oxide dispersion in SBA-15 was analyzed by STEM and EDX. FeCl3 provides the highest amount of Fe loading in mesoporous SBA-15. The photocatalytic properties of Fe2O3/SBA-15 samples at pH = 3 and pH = 6 were evaluated in catechol and hydroquinone photodecomposition by inducing visible radiation. The conversion of catechol and hydroquinone, at pH = 3 and pH = 6 with iron(III) acetylacetonate and FeCl3 as the precursor of iron oxide nanoparticles, were measured by UV-Vis spectroscopy, chemical oxygen demand (COD) and total organic carbon (TOC) analysis.
-
Jennifer J. Salinas,Marisol McDaniel,Deborah Parra-Medina 대한예방의학회 2018 Journal of Preventive Medicine and Public Health Vol.51 No.5
Objectives: To determine the relationships between physical activity (PA), the neighborhood environment support for PA, and social support for PA among Mexican-American women living in South Texas. The Enlace study was a randomized controlled trial that tested the effectiveness of a promotora-led PA intervention among low-income Mexican origin women (n=614) living in colonias. Methods: The dependent measures included accelerometer-measured average moderate to vigorous physical activity (MVPA) and sedentary breaks and the Community Health Activities Model Program for Seniors PA 41-item questionnaire. The independent measures included the Physical Activity and Neighborhood Environment Scale (PANES) and the 13-item Physical Activity Social Support (PASS) scale. Results: Enlace participants were on average 40.4 (standard deviation, 10.3) years old, born in Mexico (86.1%), and uninsured (83.1%). Adjusted linear regression results indicated that each 1-point increment in the PANES overall score was associated with 0.050 (p<0.001) unit increase in sedentary break and a −0.043 (p=0.001) unit decrease in sedentary break duration. Both PANES (β=0.296; p=0.002) and PASS scores (β=0.076; p<0.001) were associated with weekly average self-reported MVPA. Interaction effects were observed between PASS scores and accelerometer-measured frequency of sedentary breaks and sedentary time duration. Conclusions: The findings of this study indicate that the relationships between PA and built environment and social support are measure-dependent and suggest that reducing sedentary time in this population may require a closer assessment of social support for PA.
-
Salinas, Jennifer J.,McDaniel, Marisol,Parra-Medina, Deborah The Korean Society for Preventive Medicine 2018 예방의학회지 Vol.51 No.5
Objectives: To determine the relationships between physical activity (PA), the neighborhood environment support for PA, and social support for PA among Mexican-American women living in South Texas. The Enlace study was a randomized controlled trial that tested the effectiveness of a promotora-led PA intervention among low-income Mexican origin women (n=614) living in colonias. Methods: The dependent measures included accelerometer-measured average moderate to vigorous physical activity (MVPA) and sedentary breaks and the Community Health Activities Model Program for Seniors PA 41-item questionnaire. The independent measures included the Physical Activity and Neighborhood Environment Scale (PANES) and the 13-item Physical Activity Social Support (PASS) scale. Results: Enlace participants were on average 40.4 (standard deviation, 10.3) years old, born in Mexico (86.1%), and uninsured (83.1%). Adjusted linear regression results indicated that each 1-point increment in the PANES overall score was associated with 0.050 (p<0.001) unit increase in sedentary break and a -0.043 (p=0.001) unit decrease in sedentary break duration. Both PANES (${\beta}=0.296$; p=0.002) and PASS scores (${\beta}=0.076$; p<0.001) were associated with weekly average self-reported MVPA. Interaction effects were observed between PASS scores and accelerometer-measured frequency of sedentary breaks and sedentary time duration. Conclusions: The findings of this study indicate that the relationships between PA and built environment and social support are measure-dependent and suggest that reducing sedentary time in this population may require a closer assessment of social support for PA.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
