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RISS 인기검색어
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- 저자 : Yung-Hsu Hsieh (검색결과 5 건)
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Chang, Yung-Shan,Choi, Mingi,Baek, Minki,Hsieh, Ping-Yen,Yong, Kijung,Hsu, Yung-Jung Elsevier 2018 Applied Catalysis B Vol.225 No.-
<P><B>Abstract</B></P> <P>In this study, we have synthesized CdS/CdSe co-sensitized brookite TiO<SUB>2</SUB> nanostructures with hydrogen doping (H:TiO<SUB>2</SUB>/CdS/CdSe) in a facile solution reaction and studied their PEC performances. Compared to undoped brookite TiO<SUB>2</SUB>, the H:TiO<SUB>2</SUB>/CdS/CdSe composites exhibit much enhanced photocurrent generation, which originates from the improved charge transfer kinetics endowed by hydrogen doping and sensitization. Time-resolved photoluminescence (PL) and electrochemical impendence spectroscopy (EIS) are employed to explore the charge transfer dynamics between sensitizers and TiO<SUB>2</SUB> and charge carrier kinetics at the semiconductor/electrolyte interface. According to the analytical results, sensitizations of TiO<SUB>2</SUB> are found to enhance the charge separation efficiency. Besides, the hydrogen doping into TiO<SUB>2</SUB> generates oxygen vacancy states, providing additional charge transfer pathway and prohibiting charge recombination, beneficial for enhancing the PEC performances as well. Based on the charge dynamics data, we further develop charge transfer models for TiO<SUB>2</SUB>/CdS/CdSe and H:TiO<SUB>2</SUB>/CdS/CdSe. The findings from this work can help understanding the charge transfer dynamics in brookite TiO<SUB>2</SUB>-based composite systems as well as designing versatile photoelectrodes for solar energy conversion.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CdS/CdSe co-sensitized brookite H:TiO<SUB>2</SUB> exhibit much enhanced photoactivity. </LI> <LI> Superiority of H:TiO<SUB>2</SUB>/CdS/CdSe results from the improved charge transfer. </LI> <LI> Practical use for photoelectrochemical hydrogen production was demonstrated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Wei-Chou Chang,Chang-Hsien Liu,Hsian-He Hsu,Guo-Shu Huang,Ho-Jui Tung,Tsai-Yuan Hsieh,Shih-Hung Tsai,Chung-Bao Hsieh,Chih-Yung Yu 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.5
Objective: To determine whether treatment outcome is associated with visualization of contrast extravasation in patients with acute massive gastrointestinal bleeding after endoscopic failure. Materials and Methods: From January 2007 to December 2009, patients that experienced a first attack of acute gastrointestinal bleeding after failure of initial endoscopy were referred to our interventional department for intra-arterial treatment. We enrolled 79 patients and divided them into two groups: positive and negative extravasation. For positive extravasation, patients were treated by coil embolization; and in negative extravasation, patients were treated with intra-arterial vasopressin infusion. The two groups were compared for clinical parameters, hemodynamics, laboratory findings, endoscopic characteristics, and mortality rates. Results: Forty-eight patients had detectable contrast extravasation (positive extravasation), while 31 patients did not (negative extravasation). Fifty-six patients survived from this bleeding episode (overall clinical success rate, 71%). An elevation of hemoglobin level was observed in the both two groups; significantly greater in the positive extravasation group compared to the negative extravasation group. Although these patients were all at high risk of dying, the 90-day mortality rate was significantly lower in the positive extravasation than in the negative extravasation (20% versus 42%, p < 0.05). A multivariate analysis suggested that successful hemostasis (odds ratio [OR] = 28.66) is the most important predictor affecting the mortality in the two groups of patients. Conclusion: Visualization of contrast extravasation on angiography usually can target the bleeding artery directly, resulting in a higher success rate to control of hemorrhage. Objective: To determine whether treatment outcome is associated with visualization of contrast extravasation in patients with acute massive gastrointestinal bleeding after endoscopic failure. Materials and Methods: From January 2007 to December 2009, patients that experienced a first attack of acute gastrointestinal bleeding after failure of initial endoscopy were referred to our interventional department for intra-arterial treatment. We enrolled 79 patients and divided them into two groups: positive and negative extravasation. For positive extravasation, patients were treated by coil embolization; and in negative extravasation, patients were treated with intra-arterial vasopressin infusion. The two groups were compared for clinical parameters, hemodynamics, laboratory findings, endoscopic characteristics, and mortality rates. Results: Forty-eight patients had detectable contrast extravasation (positive extravasation), while 31 patients did not (negative extravasation). Fifty-six patients survived from this bleeding episode (overall clinical success rate, 71%). An elevation of hemoglobin level was observed in the both two groups; significantly greater in the positive extravasation group compared to the negative extravasation group. Although these patients were all at high risk of dying, the 90-day mortality rate was significantly lower in the positive extravasation than in the negative extravasation (20% versus 42%, p < 0.05). A multivariate analysis suggested that successful hemostasis (odds ratio [OR] = 28.66) is the most important predictor affecting the mortality in the two groups of patients. Conclusion: Visualization of contrast extravasation on angiography usually can target the bleeding artery directly, resulting in a higher success rate to control of hemorrhage.
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