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Photophysical,optical,and photocatalytic hydrogen production properties of layered-type BaNb_(2-x)Ta_(x)P_(2)O_(11)(x=0,0.5,1.0,1.5,and 2.0)compounds

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Journal of Materials Science & Technology 2022年第3期98卷 26-32页

作者： Min Je Kang Gill sang han In Sun Cho Department of Materials Science and Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Layered-type metal phosphates of BaNb_(2-x)Ta_(x)P_(2)O_(11)(x=0,0.5,1.0,1.5,and 2.0)were synthesized using a solid-state reaction *** photophysical,optical,and photocatalytic hydrogen production properties of the resulting powders were investigated for the first ***-pure and homogeneous powders with irregular morphologies were obtained at a calcination temperature of 1200℃.As the Ta content increased,the interlayer distance along the c-axis increased by up to 0.14%.Additionally,the optical bandgap values increased from 3.32 to 3.59 *** energy band positions were estimated from the Mott–Schottky ***_(2)P_(2)O_(11)(x=0)exhibited the lowest conduction band edge position(-0.14 V *** normal hydrogen electrode,NHE),which is located above the water reduction potential(0.0 V ***).In comparison,BaTa_(2)P_(2)O_(11)(x=2.0)exhibited the highest conduction band edge position(-0.29 V ***),comparable to that of TiO_(2).The photocatalytic activity for hydrogen produced from splitting water was measured under ultraviolet light ***,BaTa_(2)P_(2)O_(11)exhibited the highest activity(7.3μmol/h),which was 15 and 10 times larger than BaNb_(2)P_(2)O_(11)(0.5μmol/h)and nano-TiO_(2)(0.7μmol/h),*** activity of BaTa_(2)P_(2)O_(11)increased to 24.4μmol/h after deposition of the NiO_(x)co-catalyst(1 wt.%),which remained stable during continuous operation(~35 h).

关键词： BaNb_(2)P_(2)O_(11) BaTa_(2)P_(2)O_(11) Layered crystal structure Bandgap Band edge positions Photocatalytic hydrogen production

Perspectives of laparoscopic surgery for gastric cancer

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Chinese Journal of Cancer Research 2022年第5期34卷 533-538页

作者： Jeong Ho Song sang-Uk han Department of Surgery Ajou University School of MedicineSuwon 16499Republic of Korea

Gastrectomy is the main treatment option for gastric cancer patients. Laparoscopic approach has become popular as an alternative to open method during the last decades, and clinical trials have revealed safety and feasibility in the short-and long-term outcomes of laparoscopic gastrectomy. The aim of this review is to summarize the results of prospective clinical trials and propose future perspectives for laparoscopic gastrectomy.

关键词： Gastric cancer laparoscopic gastrectomy minimally-invasive surgery

Fabrication and Mechanical Properties of Sm2O3 Doped CeO2 Reinforced Ti3AlC2 Nano Composite

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Journal of Rare Earths 2004年第Z2期22卷 85-88页

作者： Jae Ho han sang Whan Park Young Do Kim Division of Materials Science & Engineering Hanyang UniversitySeoul133-791Korea Korea Institute of Science and TechnologyMulti-Functional Ceramics Research CenterSeoul136-791Korea Division of Materials Science & EngineeringHanyang UniversitySeoul133-791Korea

The fabrication process of Sm2O3 doped CeO2 reinforced Ti3AlC2 nano composites including the nano particle dispersion process by a hetero-coagulation process was developed using in-situ synthesis and densification process of Ti3AlC2. The effects of Sm2O2 doped CeO2 nano particles on mechanical properties of Ti3AlC2 were investigated. It was found that the presence of 20SDC nano particles in Ti3AlC2 was very effective to improve the mechanical properties of Ti3AlC2 without spoiling the unique characteristics of Ti3AlC2temary carbide.

关键词： nano ceramic composite Ti3AlC2 CeO2 fabrication rare earths

Improvement in tensile strength of extruded Mg-5Bi alloy through addition of Sn and its underlying strengthening mechanisms

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Journal of Magnesium and Alloys 2022年第11期10卷 3100-3112页

作者： sang-Cheol Jin Jae Won Cha Jeong Hun Lee Taekyung Lee sang-Ho han Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Ulsan Regional Division Korea Institute of Industrial TechnologyUlsan 44413Republic of Korea School of Mechanical Engineering Pusan National UniversityBusan 46241Republic of Korea Department of Materials Analysis Korea Institute of Materials ScienceChangwon 51508Republic of Korea

Through an investigation of the microstructure and mechanical properties of extruded Mg–5Bi–x Sn(BT5x, x = 0, 2, 4, and 6 wt%) alloys,this study demonstrates that the addition of Sn to an Mg–5Bi binary alloy significantly improves the tensile strength of the extruded *** the extruded alloys exhibit a typical basal fiber texture and a partially dynamically recrystallized(DRXed) microstructure consisting of fine DRXed grains and coarse un DRXed grains. As the Sn content increases from 0 wt% to 6 wt%, the average size of the DRXed grains decreases from 4.2 to 2.8 μm owing to the increase in the amount of precipitates via their grain-boundary pinning effect. The extruded B5 and BT52 alloys contain numerous Mg_(3)Bi_(2) precipitates, but their size and number density are smaller and higher, respectively, in the latter *** Mg_(2)Sn precipitates as well as Mg_(3)Bi_(2)precipitates are present in the extruded BT54 and BT56 alloys, and the number density of the Mg_(2)Sn precipitates is higher in the latter alloy because of its higher Sn content. The addition of 2 wt% Sn to the B5 alloy significantly improves the yield strength(YS) and ultimate tensile strength(UTS) of the extruded alloy—by 76 and 57 MPa, respectively. This drastic improvement is the combined outcome of enhanced grain-boundary hardening, precipitation hardening, and solid-solution hardening effects induced by the refined DRXed grains, numerous precipitates, and Sn solute atoms, respectively. The further addition of 2 wt% or 4 wt% Sn to the BT52 alloy leads to moderate increments in the YS and UTS of the extruded alloy. Specifically, each addition of 2 wt% Sn increases the YS and UTS by ~26 and ~20 MPa, respectively, which is attributed mainly to the additional precipitation hardening effect induced by the Mg_(2)Sn precipitates.

关键词： Mg-Bi-Sn alloy Extrusion Precipitation Microstructure Tensile property

Controlled oxidation of Ni for stress-free hole transport layer of large-scale perovskite solar cells

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Nano Research 2019年第12期12卷 3089-3094页

作者： Seongha Lee Hee-Suk Roh Gill sang han Jung-Kun Lee Department of Mechanical Engineering and Materials Science University of PittsburghPennsylvania 15261USA School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

The effect of the residual thermal stress of NiO films on the performance of an inverted type perovskite solar cell was *** this study,NiO films were grown on fluorine dopedtin oxide(FTO)substrates of different surface roughness by thermally oxidizing Ni film and weretested as a hole transport layer for large-scale perovskite solar *** and simulation results show that it is very important tosuppress the appearance of the residual stress at the NiO-FTO in terface during the oxidation of the Ni film for effective hole extracti *** Ni oxidation on the flat FTO film produced in-plane compressive stress in the NiO film due to the Ni film volume *** led to theformation of defects including small *** residual stress and defects in creased leakage curre nt through the NiO film,preve ntingholes from being selectively collected at the NiO-perovskite ***,when Ni was deposited and oxidized on the rough surface,the residual stress of the NiO film was negligible and its inhere nt high resistance was ***-free NiO film is an excelle nt holetransport layer that stops the photogenerated electrons of the perovskite layer from moving to *** improvements in the structural andelectrical qualities of the NiO film by engirteering the residual stress reduce the carrier recombination and increase the power conversi onefficiency of the perovskite solar cells to 16.37%.

关键词： nickel oxidation surface roughness residual stress perovskite solar cells large scale processing

Splenic infarction associated with sorafenib use in a hepatocellular carcinoma patient

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World Journal of Gastroenterology 2011年第2期17卷 267-270页

作者： sang Ock Kim sang Young han Yang Hyun Baek Sung Wook Lee Ji Sun han Byung Geun Kim Jin han Cho Kyung Jin Nam Department of Gastroenterology and Hepatology Dong-A University HospitalDongdaesin-dong Seo-gu Busan 602-103 South Korea Dong-A University Collegeof Medicine 3-ga Dongdaesing-dong Seo-gu Busan 602-103South Korea Department of Radiology Dong-AUniversity Hospital Dongdaesin-dong Seo-gu Busan 602-103South Korea

Sorafenib,a multitargeted tyrosine kinase inhibitor,has been shown to improve survival in patients with advanced hepatocellular carcinoma(HCC).As the clinical use of sorafenib increases,many adverse effects have been reported,such as hand-foot skin reaction,diarrhea,anorexia,asthenia,alopecia,weight loss,hypertension and arterial ***,there are no prior reports of splenic infarction as an adverse effect of ***,a case of splenic infarction in a patient with HCC who was treated with sorafenib is reported. The patient had no other predisposing factors to explain the splenic infarction except for the administration of *** splenic infarction improved after sorafenib was discontinued;however,the HCC progressed.

关键词： Hepatocellular carcinoma Sorafenib Tyrosine kinase inhibitor Adverse effects Splenic infarction

Homotypic Vacuole Fusion Requires VTI11 and Is Regulated by Phosphoinositides

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Molecular Plant 2014年第6期7卷 1026-1040页

作者： sang Won han Maria Fernanda Rodriguez-Welsh Marcela Rojas-Pierce Department of Plant and Microbial Biology North Carolina State University Raleigh NC 27695 USA

Most plant cells contain a large central vacuole that is essential to maintain cellular turgor. We report a new mutant allele of VTI11 that implicates the SNARE protein VTI11 in homotypic fusion of protein storage and lytic vacuoles. Fusion of the multiple vacuoles present in vtill mutants could be induced by treatment with Wortmannin and LY294002, which are inhibitors of Phosphatidylinositol 3-Kinase （PI3K）. We provide evidence that Phosphatidylinositol 3-Phosphate （Ptdlns（3）P） regulates vacuole fusion in vtill mutants, and that fusion of these vacuoles requires intact microtubules and actin filaments. Finally, we show that Wortmannin also induced the fusion of guard cell vacuoles in fava beans, where vacuoles are naturally fragmented after ABA-induced stomata closure. These results suggest a ubiquitous role of phosphoinositides in vacuole fusion, both during the development of the large central vacuole and during the dynamic vacuole remodeling that occurs as part of stomata movements.

关键词： vacuole SNARE phosphoinositides membrane fusion Wortmannin.

Gastric ischemia after epinephrine injection in a patient with liver cirrhosis

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World Journal of Gastroenterology 2013年第3期19卷 411-414页

作者： Su Young Kim Seung-Hee han Kyung han Kim sang Ock Kim sang-Young han Sung-Wook Lee Yang Hyun Baek Department of Internal Medicine Dong-A University College of MedicineBusan 602-715South Korea

Endoscopic epinephrine injection is relatively easy,quick and ***,it has a low rate of com-plications,and it is widely used for the management of nonvariceal upper gastrointestinal *** have been several case reports of gastric ischemia after en-doscopic injection *** intra-arterial in-jection may result in either spasm or thrombosis,leading to subsequent tissue ischemia or necrosis,although the stomach has a rich vascular supply and the vascular reserve of the intramural *** addition to endoscopic injection therapy,smoking,hypertension and atherosclerosis are risk factors of gastric ischemia. We report a case of gastric ischemia after submucosal epinephrine injection in a 51-year-old woman with hy-pertension and liver cirrhosis.

关键词： Hematemesis Epinephrine Gastric ischemia Liver cirrhosis Hypertension

Managing the lifecycle of perovskite solar cells: Addressing stability and environmental concerns from utilization to end-of-life

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eScience 2024年第2期4卷 1-27页

作者： Hee Jung Kim Gill sang han Hyun Suk Jung School of Advanced Materials Science&Engineering Sungkyunkwan University2066Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea Division of Advanced Materials Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwon 16419Republic of Korea

Perovskite solar cells(PSCs)have shown remarkable advancements and achieved impressive power conversion efficiencies since their initial introduction in ***,challenges regarding stability,quality,and sustainability must be addressed for their successful commercial *** review analyses the recent studies and challenges related to the operating life and end-of-life utilization of *** to enhance the stability and mitigate the toxic Pb leakage in operational and recycling approaches of discarded PSCs post their end-of-life are examined to establish a viable and sustainable PSC ***,future research directions are proposed for the advancements in the PSC *** goal is to ensure high efficiency as well as economic and environmental sustainability throughout the lifecycle of PSCs.

关键词： Levelized cost of electricity Metal electrode Pb leakage Perovskite Power conversion efficiency Solar cell life cycle