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Improved cell performance and sulphur tolerance using A-site substituted Sr_(2)Fe_(1.4)Ni_(0.1)Mo_(0.5)O_(6-δ)anodes for solid-oxide fuel cells

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Clean Energy 2023年第1期7卷 70-83页

作者： Haixia Li Wanhua Wang Jie Lin Ka-young park Taehee Lee Andreas Heyden Dong Ding Fanglin Chen Department of Mechanical Engineering University of South CarolinaColumbiaSC29208USA Department of Chemical Engineering University of South CarolinaColumbiaSC29208USA Energy&Environmental Science and Technology Idaho National LaboratoryIdaho FallsID83401USA

Solid-oxide fuel cells(SOFCs)offer great promise for producing electricity using a wide variety of fuels such as natural gas,coal gas and gasified carbonaceous solids;however,conventional nickel-based anodes face great challenges due to contaminants in readily available fuels,especially sulphur-containing ***,the development of new anode materials that can suppress sulphur poisoning is crucial to the realization of fuel-flexible and cost-effective *** this work,La_(0.1)Sr_(1.9)Fe_(1.4)Ni_(0.1)Mo_(0.5)O_(6-δ)(LSFNM)and Pr_(0.1)Sr_(1.9)Fe_(1.4)Ni_(0.1)Mo_(0.5)O_(6-δ)(PSFNM)materials have been synthesized using a sol-gel method in air and investigated as anode mater-ials for *** nanoparticle-decorated ceramic anodes were obtained by the reduction of LSFNM and PSFNM in H_(2)at 850℃,forming a Ruddlesden-Popper oxide with exsolved FeNi3 bimetallic *** electrochemical performance of the Sr_(2)Fe_(1.4)Ni_(0.1)Mo_(0.5)O_(6-δ)ceramic anode was greatly enhanced by La doping of A-sites,resulting in a 44%decrease in the polarization resistance in reducing *** maximum power densities of Sr-and Mg-doped LaGaO_(3)(LSGM)(300μm)electrolyte-supported single cells with LSFNM as the anode reached 1.371 W cm^(-2)in H_(2)and 1.306 W cm^(-2)in 50 ppm H_(2)S-H_(2)at 850℃.Meanwhile,PSFNM showed improved sulphur tolerance,which could be fully recovered after six cycles from H_(2)to 50 ppm H_(2)S-H_(2)*** study indicates that LSFNM and PSFNM are promising high-performance anodes for SOFCs.

关键词： A-site doping perovskite Ruddlesden-Popper structure alloy nanoparticles polarization resistance solid oxide fuel cells

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The longitudinal effect of parental support during adolescence on the trajectory of sport participation from adolescence through young adulthood

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Journal of Sport and Health Science 2018年第1期7卷 70-76页

作者： Chung gun Lee Seiyeong park Seunghyun Yoo Department of Physical Education Seoul National University Graduate School of Public Health Seoul National University

Background: One efficient way to increase physical activity is through sport participation because participation in sport activities inherently includes many enjoyable aspects, such as social interaction, competition, personal challenge, and goal achievement. The main purpose of this study was to investigate the longitudinal effect of parental support during adolescence on the trajectory of sport participation from adolescence through young ***: The data used in this study came from the National Longitudinal Study of Adolescent to Adult Health(Add Health). It is a 4-wave longitudinal study that followed up a nationally representative sample of middle and high school students in the US. A series of multilevel logistic regression models were used to examine the effect of parental support at Wave 1 on the trajectory of sport participation from Wave 1 to Wave ***: The effect of parental support during adolescence on participants' sport participation lasted until they become young adults(Wave 3)(p young adulthood(Wave 3) becomes insignificant when adjusting for self-esteem and depression. Among the female participants, parental support at Wave 1 was a significant predictor for sport participation at Waves 1, 2, and 3(p young adulthood(Wave 3) over and above the effects of depression and self-esteem in female ***: The results of this study contributed to the literature by providing important information on the longitudinal effect of parental support durin

关键词：青春期运动父母生活成人轨道相互作用回归建模

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Anti-neuro-inflammatory effects of Nardostachys chinensis in lipopolysaccharide-and lipoteichoic acid-stimulated microglial cells

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Chinese Journal of Natural Medicines 2016年第5期14卷 343-353页

作者： Sun young park young Hun Kim Geuntae park Bio-IT Fusion Technology Research Institute Pusan National University Department of Nanomaterials Engineering Pusan National University

Excessive microglial cell activation is related to the progression of chronic neuro-inflammatory disorders. Heme oxygenase-1(HO-1) expression mediated by the NFE2-related factor(Nrf-2) pathway is a key regulator of neuro-inflammation. Nardostachys chinensis is used as an anti-malarial, anti-nociceptive, and neurotrophic treatment in traditional Asian medicines. In the present study, we examined the effects of an ethyl acetate extract of N. chinensis(EN) on the anti-neuro-inflammatory effects mediated by HO-1 up-regulation in Salmonella lipopolysaccharide(LPS)- or Staphylococcus aureus lipoteichoic acid(LTA)-stimulated BV2 microglial cells. Our results indicated that EN suppressed pro-inflammatory cytokine production and induced HO-1 transcription and translation through Nrf-2/antioxidant response element(ARE) signaling. EN markedly inhibited LPS- and LTA-induced activation of nuclear factor-kappa B(NF-?B) as well as phosphorylation of mitogen-activated protein kinases(MAPKs) and signal transducer and activator of transcription(STAT). Furthermore, EN protected hippocampal HT22 cells from indirect neuronal toxicity mediated by LPS- and LTA-treated microglial cells. These results suggested that EN impairs LPS- and LTA-induced neuro-inflammatory responses in microglial cells and confers protection against indirect neuronal damage to HT22 cells. In conclusion, our findings indicate that EN could be used as a natural anti-neuro-inflammatory and neuroprotective agent.

关键词： Nardostachys chinensis Anti-inflammation Lipopolysaccharide Lipoteichoic acid Heme oxygenase-1

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Small sphincterotomy combined with endoscopic papillary large balloon dilation versus sphincterotomy

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World Journal of Gastroenterology 2009年第34期15卷 4298-4304页

作者： Hyun gun Kim young Koog Cheon young Deok Cho Jong Ho Moon Do Hyun park Tae Hoon Lee Hyun Jong Choi Sang-Heum park Joon Seong Lee Moon Sung Lee Institute for Digestive Research Digestive Disease Center Soonchunhyang University College of Medicine

AIM:To compare small sphincterotomy combined with endoscopic papillary large balloon dilation(SES+ ELBD)and endoscopic sphincterotomy(EST)for large bile duct stones. METHODS:We compared prospectively SES+ELBD (group A,n=27)with conventional EST(group B, n=28)for the treatment of large bile duct stones(≥ 15 mm).When the stone could not be removed with a normal basket,mechanical lithotripsy was performed. We compared the rates of complete stone removal with one session and application of mechanical lithotripsy. RESULTS:No significant differences were observed in the mean largest stone size(A:20.8 mm,B:21.3 mm), bile duct diameter(A:21.4 mm,B:20.5 mm),number of stones(A:2.2,B:2.3),or procedure time(A:18 min, B:19 min)between the two *** rates of complete stone removal with one session was 85%in group A and 86%in group B(P=0.473).Mechanical lithotripsy was required for stone removal in nine of 27 patients(33%)in group A and nine of 28 patients (32%,P=0.527)in group ***:SES+ELBD did not show significant benefits compared to conventional EST,especially for the removal of large(≥15 mm)bile duct stones.

关键词：括约肌乳头球囊胆管 EST 结石局长经济

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Silent advanced large cell neuroendocrine carcinoma with synchronous adenocarcinoma of the colon:A case report

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World Journal of Gastrointestinal Oncology 2022年第11期14卷 2266-2272页

作者： Hyeon Seok Baek Sang Wook Kim Soo Teik Lee Ho Sung park Seung young Seo Department of Internal Medicine Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University HospitalJeonju-si 56445Jeollabuk-doSouth Korea Department of Pathology Jeonbuk National University Medical SchoolJeonjusi 56445Jeollabuk-doSouth Korea

BACKGROUND Large cell neuroendocrine carcinoma(LCNEC)accounts for about 0.25%of colorectal cancer ***,synchronous LCNEC and adenocarcinoma coexistence in the colon is very *** are usually aggressive and have a poor ***,colorectal LCNEC patients complain of abdominal symptoms such as pain,diarrhea or hematochezia because it is often diagnosed as an advanced disease that accompanies metastatic *** SUMMARY We describe a case of relatively asymptomatic synchronous LCNEC and colon adenocarcinoma.A 62-year-old male patient visited our hospital due to anemia detected by a local health *** did not complain of melena,hematochezia or abdominal *** examination was unremarkable and his abdomen was soft,nontender and nondistended with no palpable *** tests revealed anemia with hemoglobin 5.1 g/*** revealed an ulcerofungating lesion in the ascending colon and about a 1.5 cm-sized large sessile polyp in the sigmoid *** biopsy of the ascending colon lesion revealed the ulcerofungating mass that was LCNEC and endoscopic mucosal resection at the sigmoid colon lesion showed a large polypoid lesion that was *** liver,lung,bone and lymph nodes metastasis was found on chest/abdominal computed tomography and positron emission *** patient was diagnosed with advanced colorectal LCNEC with liver,lung,bone and lymph node metastasis(stage IV)and synchronous colonic adenocarcinoma *** this case,no specific symptom except anemia was observed despite the multiple *** patient refused systemic chemotherapy and was discharged after *** We report a case of silent LCNEC of the colon despite the advanced state and synchronous adenocarcinoma.

关键词： Large cell neuroendocrine carcinoma Colon Synchronous Adenocarcinoma Case report

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Liquid crystal between two distributed Bragg reflectors enables multispectral small-pitch spatial light modulator

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Light(Science & Applications) 2022年第8期11卷 1643-1645页

作者： Junghyun park Kanghee Won young Kim Advanced Sensor Lab Device Research CenterSamsung Advanced Institute of TechnologySuwonRepublic of Korea

The ability of controlling the phase of light at the subwavelength scale can be a game-changer due to its extraordinally wide angle-range in the wavefront shaping. By combining two conventional material and configurat... 详细信息

关键词： crystal enable light

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Glucocorticoid pulse therapy in an elderly patient with post-COVID-19 organizing pneumonia:A case report

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World Journal of Clinical Cases 2023年第17期11卷 4152-4158页

作者： Shinhee park youngeun Jang So-My Koo Bo Da Nam Hee-young Yoon Division of Allergy and Pulmonary Medicine Department of Internal MedicineSoonchunhyang University Bucheon HospitalBucheon 14584South Korea Division of Allergy and Respiratory Diseases Department of Internal MedicineSoonchunhyang University Seoul HospitalSeoul 04401South Korea Department of Radiology Soonchunhyang University Seoul HospitalSeoul 04401South Korea

BACKGROUND Pulmonary fibrosis often occurs as a sequel of coronavirus disease 2019(COVID-19);however,in some cases,it can rapidly progress,similar to the acute exacerbation of interstitial lung *** are the standard treatment for severe COVID-19 pneumonia requiring oxygen supply;however,the post-COVID-19 efficacy of high-dose steroid therapy remains ***,we presented a case of an 81-year-old man who developed acute respiratory failure after COVID-19 and was treated with glucocorticoid pulse *** SUMMARY An 81-year-old man with no respiratory symptoms was admitted due to a diabetic *** had been previously treated for COVID-19 pneumonia six weeks ***,upon admission,he suddenly complained of dyspnea and required a high-flow oxygen *** simple chest radiography and computed tomography(CT)revealed diffuse ground-glass opacities and consolidation in both ***,repeated sputum tests did not identify any infectious pathogens,and initial broad-spectrum antibiotic therapy did not result in any clinical improvement with the patient having an increasing oxygen *** patient was diagnosed with post-COVID-19 organizing ***,we initiated glucocorticoid pulse therapy of 500 mg for three days followed by a tapered dose on hospital day(HD)*** three days of pulse treatment,the patient's oxygen demand *** patient was subsequently discharged on HD 41,and chest radiography and CT scans have almost normalized nine months after *** Glucocorticoid pulse therapy may be considered when the usual glucocorticoid dose is ineffective for patients with COVID-19 sequelae.

关键词： Coronavirus Glucocorticoid Lung disease Interstitial Organizing pneumonia Case report

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Characterizing and Mitigating Chemomechanical Degradation in High-Energy Lithium-Ion Battery Cathode Materials

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Accounts of Materials Research 2022年第5期3卷 511-524页

作者： Norman S.Luu Kyu-young park Mark C.Hersam Department of Materials Science and Engineering Northwestern UniversityEvanstonIllinois 60208United States Graduate Institute of Ferrous and Energy Materials Technology Pohang University of Science and TechnologyPohangKyungbuk 37673Republic of Korea Department of Chemistry and Department of Electrical and Computer Engineering Northwestern UniversityEvanstonIllinois 60208United

Lithium-ion batteries(LIBs)are nearly ubiquitous energy storage solutions,powering devices ranging from consumer electronics to electric *** advance these applications,current LIB research efforts are directed toward improving energy and power densities,cyclic lifetimes,charging speeds,and *** parameters are intrinsically tied to properties of the active electrode materials,such as the redox mechanism,chemical composition,and crystal *** particularly challenging issue is that the active electrode materials that possess higher theoretical energy densities are generally more susceptible to degradation during cycling.A notable example is the family of layered multicomponent transition metal oxides,which is the incumbent class of active LIB cathode materials for electric *** increase their theoretical capacities,the transition metal fraction in these materials is trending toward higher Ni ***,Ni-rich chemistries suffer from electrochemical,crystallographic,and mechanical degradation that increase in severity with increasing Ni ***,alternative high-energy cathode materials,including overlithiated layered oxides and disordered rock salt materials,present additional stability challenges that must be overcome before they can be realistically incorporated into LIB *** chemomechanical degradation in high-energy LIB cathode materials occurs at multiple length *** defects,such as antisite defects or vacancies,are commonly generated during electrochemical cycling and can contribute to the loss of cyclable active *** both the primary and secondary particle level,electrochemical cycling also induces significant volumetric changes and state-of-charge heterogeneity,generating regions of high stress and strain that are precursors to mechanical ***,at the electrode level,nonuniform charge transfer reactions throughout the electrode can lead to locally overcharged regions that become

关键词： Battery electrode cycling

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Flash‑Induced High‑Throughput Porous Graphene via Synergistic Photo‑Effects for Electromagnetic Interference Shielding

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纳微快报:英文版 2023年第11期15卷 1-18页

作者： Jin Soo Lee Jeong‑Wook Kim Jae Hee Lee Yong Koo Son young Bin Kim Kyoohee Woo Chanhee Lee Il‑Doo Kim Jae young Seok Jong Won Yu Jung Hwan park Keon Jae Lee Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑roYuseong‑guDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑roYuseong‑guDaejeon 34141Republic of Korea Department of Printed Electronics Nano‑Convergence Manufacturing Systems Research DivisionKorea Institute of Machinery and Materials(KIMM)156 Gajeongbuk‑RoYuseong‑GuDaejeon 34103Republic of Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology232 Gongneung‑roNowon‑guSeoul 01811Republic of Korea Department of Mechanical Engineering(Department of Aeronautics Mechanical and Electronic Convergence Engineering)Kumoh National Institute of Technology61 Daehak‑roGumiGyeongbuk 39177Republic of Korea

Porous 2D materials with high conductivity and large surface area have been proposed for potential electromagnetic interference(EMI)shielding materials in future mobility and wearable applications to prevent signal noise,transmission inaccuracy,system malfunction,and health ***,we report on the synthesis of lightweight and flexible flash-induced porous graphene(FPG)with excellent EMI shielding *** broad spectrum of pulsed flashlight induces photo-chemical and photo-thermal reactions in polyimide films,forming 5×10 cm^(2)-size porous graphene with a hollow pillar structure in a few *** resulting material demonstrated low density(0.0354 g cm^(−3))and outstanding absolute EMI shielding effectiveness of 1.12×10^(5) dB cm^(2) g^(−1).The FPG was characterized via thorough material analyses,and its mechanical durability and flexibility were confirmed by a bending cycle ***,the FPG was utilized in drone and wearable applications,showing effective EMI shielding performance for internal/external EMI in a drone radar system and reducing the specific absorption rate in the human body.

关键词： Porous graphene Flash lamp Photo-pyrolysis High-throughput Electromagnetic interference shielding

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Optimally arranged TiO_(2)@MoS_(2) heterostructures with effectively induced built-in electric field for high-performance lithium-sulfur batteries

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能源化学:英文版 2023年第8期83卷 496-508,I0012页

作者： Jeongyoub Lee Changhoon Choi Jung Been park Seungho Yu Jinho Ha Hyungsoo Lee Gyumin Jang young Sun park Juwon Yun Hayoung Im Subin Moon Soobin Lee Jung-Il Choi Dong-Wan Kim Jooho Moon Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea School of Civil Environmental and Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea Energy Storage Research Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea School of Mathematics and Computing(Computational Science and Engineering) Yonsei UniversitySeoul 03722Republic of Korea

To overcome the serious technological issues affecting lithium-sulfur(Li-S) batteries,such as sluggish sulfur redox kinetics and the detrimental shuttle effect,heterostructure engineering has been investigated as a strategy to effectively capture soluble lithium polysulfide intermediates and promote their conversion reaction by integrating highly polar metal oxides with catalytically active metals ***,to fully exploit the outstanding properties of heterostructure-based composites,their detailed structure and interfacial contacts should be designed ***,optimally arranged TiO_(2)and MoS_(2)-based heterostructures(TiO_(2)@MoS_(2)) are fabricated on carbon cloth as a multifunctional interlayer to efficiently trap polysulfide intermediates and accelerate their redox *** to the synergistic effects between TiO_(2)and MoS_(2)and the uniform heterointerface distribution that induces the ideally oriented built-in electric field,Li-S batteries with TiO_(2)@MoS_(2)interlayers exhibit high rate capability(601 mA h g^(-1)at 5 C),good cycling stability(capacity-fade rate of 0.067% per cycle over 500 cycles at2 C),and satisfactory areal capacity(5.2 mA h cm^(-2)) under an increased sulfur loading of 5.2 mg cm^(-2).Moreover,by comparing with a MoS_(2)@TiO_(2)interlayer composed of reversely arranged heterostructures,the effect of the built-in electric field’s direction on the electrocatalytic reactions of polysulfide intermediates is thoroughly investigated for the first *** superior electrocatalytic activities of the rationally arranged TiO_(2)@MoS_(2)interlayer demonstrate the importance of optimizing the built-in electric field of heterostructures for producing high-performance Li-S batteries.

关键词： Lithium-sulfur batteries Shuttle effect TiO_(2)-MoS_(2)heterostructure engineering Built-in electric field Multifunctional interlayers

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