http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
New Nanosilver/Ceria Catalyst for Atmospheric Pollution Treatment
S. Benaissa,L. Cherif-Aouali,S. Siffert,A. Aboukais,R. Cousin,A. Bengueddach 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
Mesoporous CeO2 was synthesized by the nanocasting pathway using the mesoporous SBA-15 silica as structure template and cerium nitrate as the CeO2 precursor via a solid–liquid route. Ag/CeO2 catalysts were prepared by three different methods: wetness impregnation (WI), deposition–precipitation with urea (DPU) and impregnation–reduction with citrate (IRC), with a loading of silver of 4 wt.%. They were characterized by elemental analysis, H2-TPR, X-ray powder diffraction (XRD), Brunauer, Emmett and Teller (BET) surface area, diffuse reflectance and ultraviolet visible spectroscopy (DR/UV-Vis). Ag/CeO2 catalysts retain the physical properties of mesoporous ceria and its hexagonal order. Catalytic oxidation of propylene and catalytic reduction of NO with propylene as a reducing agent were investigated on Ag/mesoporous ceria catalysts. The silver/mesoporous ceria system toward the deep oxidation of propylene and the catalytic reduction of NO depends on the catalyst preparation method. Ag/CeO2 (IRC) can be ascribed to higher surface lattice oxygen mobility over this catalyst and also to the strong interaction between silver and mesoporous ceria.
( Antonio Carlos Da Silva Moraes ),( Glycia De Freitas Moraes ),( Antonio Luis Eiras De Araujo ),( Ronir Raggio Luiz ),( Celeste Elia ),( Antonio Jose Carneiro ),( Heitor Siffert Pereira De Souza ) 대한장연구학회 2019 Intestinal Research Vol.17 No.2
Background/Aims: Consistently defining disease activity remains a critical challenge in the follow-up of patients with Crohn’s disease (CD). We investigated the potential applicability of abdominal ultrasonography with color Doppler (USCD) analysis for the detection of morphological alterations and inflammatory activity in CD. Methods: Forty-three patients with CD ileitis/ileocolitis were evaluated using USCD analysis with measurements obtained on the terminal ileum and right colon. Sonographic parameters included wall thickening, stricture, hyperemia, presence of intra-abdominal mass, and fistulas. Patients were evaluated for the clinical activity (Harvey-Bradshaw Index [HBI]), fecal calprotectin (FC) and C-reactive protein (CRP). The USCD performance was assessed using magnetic resonance enterography (MRE) as a criterion standard. Results: Most measurements obtained with USCD matched the data generated with MRE; however, the agreement improved in clinically active patients where sensitivity, positive predictive value, and accuracy were >80%, considering wall thickening and hyperemia. Complications such as intestinal wall thickening, stricture formation, and hyperemia, were detected in the USCD analysis with moderate agreement with MRE. The best agreement with the USCD analysis was obtained in regard to FC, where the sensitivity, positive predictive value, and accuracy were >70%. The overall performance of USCD was superior to that of HBI, FC and CRP levels, particularly when considering thickening, stricture, and hyperemia parameters. Conclusions: USCD represents a practical noninvasive and low-cost tool for evaluating patients with ileal or ileocolonic disease, particularly in clinically active CD. Therefore, USCD might become a useful asset in the follow-up of patients with CD. (Intest Res 2019;17:227-236.)