检索结果-南通市图书馆

Durable hierarchical phosphorus‐doped biphase MoS_(2)electrocatalysts with enhanced H^(*)adsorption

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第4期6卷 104-114页

作者： Yongteng Qian Jianmin yu Zhiyi Lyu Qianwen Zhang Tae hyeong Lee Huan Pang Dae Joon Kang College of Pharmacy Jinhua PolytechnicJinhuaZhejiangChina Department of Physics Sungkyunkwan UniversitySuwonGyeonggi‐doRepublic of Korea International Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhenGuangdongChina School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhouJiangsuChina

Phase engineering is an efficient strategy for enhancing the kinetics of electrocatalytic reactions.Herein,phase engineering was employed to prepare high‐performance phosphorous‐doped biphase(1T/2H)MoS_(2)(P‐BMS)nanoflakes for hydrogen evolution reaction(HER).The doping of MoS_(2)with P atoms modifies its electronic structure and optimizes its electrocatalytic reaction kinetics,which significantly enhances its electrical conductivity and structural stability,which are verified by various characterization tools,including X‐ray photoelectron spectroscopy,high‐resolution transmission electron microscopy,X‐ray absorption near‐edge spectroscopy,and extended X‐ray absorption fine structure.Moreover,the hierarchically formed flakes of P‐BMS provide numerous catalytic surface‐active sites,which remarkably enhance its HER activity.The optimized P‐BMS electrocatalysts exhibit low overpotentials(60 and 72 mV at 10 mA cm^(−2))in H_(2)SO_(4)(0.5 M)and KOH(1.0 M),respectively.The mechanism of improving the HER activity of the material was systematically studied using density functional theory calculations and various electrochemical characterization techniques.This study has shown that phase engineering is a promising strategy for enhancing the H*adsorption of metal sulfides.

关键词： 1T/2H MoS_(2) density functional theory electrocatalysts phase engineering phosphorous doping

Numerical multi-physical optimization of operating condition and current collecting setup for large-area solid oxide fuel cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2024年第3期18卷 356-368页

作者： Chengrong yu Zehua PAN Hongying ZHANG Bin CHEN Wanbing GUAN Bin MIAO Siew hwa CHAN Zheng ZHONG Yexin ZHOU School of Science Harbin Institute of TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of SciencesNingbo 315201China Energy Research Institute at NTU(ERIAN) Nanyang Technological UniversitySingapore 639798Singapore

Due to the depletion of traditional fossil fuels and the aggravation of related environmental problems,hydrogen energy is gaining more attention all over the world.Solid oxide fuel cell(SOFC)is a promising power generation technology operating on hydrogen with a high efficiency.To further boost the power output of a single cell and thus a single stack,increasing the cell area is an effective route.However,it was recently found that further increasing the effective area of an SOFC single cell with a flat-tubular structure and symmetric double-sided cathodes would result in a lower areal performance.In this work,a multi-physical model is built to study the effect of the effective area on the cell performance.The distribution of different physical fields is systematically analyzed.Optimization of the cell performance is also pursued by systematically tuning the cell operating condition and the current collection setup.An improvement of 42%is revealed by modifying the inlet gas flow rates and by enhancing the current collection.In the future,optimization of cell geometry will be performed to improve the homogeneity of different physical fields and thus to improve the stability of the cell.

关键词： solid oxide fuel cell(SOFC) large effective area flow rate discharge performance current collection

Volumetric fluid analysis of fixed monthly anti-VEGF treatment in patients with neovascular age-related macular degeneration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2023年第6期16卷 909-914页

作者： Bo Hee Kim In Boem Chang hyeong Gon yu In hwan Hong Department of Ophthalmology Kangbuk Samsung HospitalSungkyunkwan University School of MedicineSeoul 03181Republic of Korea Seoul On Eye Clinic Seoul 03355Republic of Korea Department of Ophthalmology Seoul National University College of MedicineSeoul National University HospitalSeoul 03080Republic of Korea Retina Center Sky Eye InstituteSeoul 06536Republic of Korea Department of Ophthalmology Dongtan Sacred Heart HospitalHallym University Medical CenterHwaseong-siGyeonggido 18450Republic of Korea

·AIM:To evaluate visual outcomes and changes in fluid after administering monthly anti-vascular endothelial growth factor(VEGF)injections to treat neovascular agerelated macular degeneration(n AMD)with subretinal fluid(SRF)and pigment epithelial detachment(PED).·METHODS:This prospective study included eyes with n AMD previously treated with as-needed anti-VEGF injections.The patients were treated with six monthly intravitreal injections of ranibizumab.Quantitative volumetric segmentation analyses of the SRF and PED were performed.The main outcome measures included best-corrected visual acuity(BCVA),and SRF and PED volumes.·RESULTS:Twenty eyes of 20 patients were included in this study.At the 6-month follow-up,BCVA and PED volume did not change significantly(P=0.110 and 0.999,respectively)but the mean SRF volume decreased from 0.53±0.82 mm3 at baseline to 0.08±0.23 mm3(P=0.002).The absorption rate of the SRF volume was negatively correlated with the duration of previous antiVEGF treatment(P=0.029).Seven of the 20 eyes(35%)showed a fluid-free macula and significant improvement in BCVA(P=0.036)by month 6.·CONCLUSION:Quantifying the SRF can precisely determine the patient’s responsiveness to anti-VEGF treatment of n AMD.

关键词： neovascular age-related macular degeneration anti-vascular endothelial growth factor treatment drug tolerance persistent subretinal fluid volumetric fluid analysis

Application of self-adaptive temperature recognition in cold-start of an air-cooled proton exchange membrane fuel cell stack

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

能源与人工智能(英文)

能源与人工智能(英文) 2022年第3期9卷 12-23页

作者： Xianxian yu Huawei Chang Junjie Zhao Zhengkai Tu Siew hwa Chan School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China Energy Research Institute Nanyang Technological University50 Nanyang Avenue637553 Singapore

The Self-adaptive control of the temperature can achieve the start of fuel cell at different operating temperatures, which is very important for the successful cold-start of the air-cooled PEMFC. The temperature distribution characteristics during the cold-start process were analyzed based on adaptive temperature recognition control in this paper. Preheating model and cold-start model were established and the optimal balance between the hot air flow rate and the temperature required to promote a uniform temperature distribution in the stack was explored in the preheating stage. Finally, the non-equilibrium mass transfer, as well as the temperature rise in the catalyst layer and gas diffusion layer with different current densities, were analyzed in the start-up stage. The results indicate that the air-cooled PEMFC stack can be successfully started up at -40 ◦C within 10 min by means of external gas heating. The current density and air velocity have significant impacts on the temperature of aircooled PEMFC stack. Dynamic analysis of air-cooled PEMFCs and real-time monitoring are suitable for machine learning and self-adaptive control to set the operation parameters to achieve successful cold start. Optimize the matching of load current and cathode inlet speed to achieve thermal management in low temperature environment.

关键词： Proton exchange membrane fuel cell Air-cooled stack Metallic bipolar plate Cold-start Gas heating

Visual and morphological outcomes of vitreomacular traction syndrome in retinitis pigmentosa treated by vitrectomy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2018年第8期11卷 1411-1415页

作者： Feng Yan Feng-Jie Xia Feng Jiang hyeong Gon yu Department of Ophthalmology Jinling HospitalSchool of MedicineNanjing University Medical School of Nanjing University Department of OphthalmologyJinling Hospital Department of Ophthalmology Seoul National University HospitalSeoul National University College of Medicine

Retrospective review of 13 eyes that had undergone pars plana vitrectomy（PPV） for vitreomacular traction（VMT） syndrome in retinitis pigmentosa（RP） and had a postoperative follow-up period ≥9 mo in order to evaluate whether it is necessary to treat VMT in RP by vitrectomy. The 13 RP eyes suffering from VMT were evaluated by means of best corrected visual acuity（BCVA）, anterior and posterior binocular examination, spectral-domain optical coherence tomography（SD-OCT） before and after operation. We detected that although vitrectomy could improve the macular morphology in some RP patients with VMT, visual outcomes might be limited and unpredicted most likely because of the long-standing retinal dysfunction, but the vitrectomy is necessary in order to remain or improve the central vision in some cases.

关键词： macular abnormalities spectral-domainoptical coherence tomography pars plana vitrectomy retinitispigmentosa

Accurate and generalizable quantitative scoring of liver steatosis from ultrasound images via scalable deep learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2022年第22期28卷 2494-2508页

作者： Bowen Li Dar-In Tai Ke Yan Yi-Cheng Chen Cheng-Jen Chen Shiu-Feng Huang Tse-hwa Hsu Wan-Ting yu Jing Xiao Lu Le Adam P Harrison Research and Development PAII Inc.BethesdaMD 20817United States Department of Gastroenterology and Hepatology Chang Gung Memorial HospitalLinkou Medical CenterTaoyuan 33305Taiwan Division of Molecular and Genomic Medicine National Health Research InstituteTaoyuan 33305Taiwan Research and Development Ping An Insurance GroupShenzhen 518001GuangdongChina

BACKGROUND Hepatic steatosis is a major cause of chronic liver disease.Two-dimensional(2D)ultrasound is the most widely used non-invasive tool for screening and monitoring,but associated diagnoses are highly subjective.AIM To develop a scalable deep learning(DL)algorithm for quantitative scoring of liver steatosis from 2D ultrasound images.METHODS Using multi-view ultrasound data from 3310 patients,19513 studies,and 228075 images from a retrospective cohort of patients received elastography,we trained a DL algorithm to diagnose steatosis stages(healthy,mild,moderate,or severe)from clinical ultrasound diagnoses.Performance was validated on two multiscanner unblinded and blinded(initially to DL developer)histology-proven cohorts(147 and 112 patients)with histopathology fatty cell percentage diagnoses and a subset with FibroScan diagnoses.We also quantified reliability across scanners and viewpoints.Results were evaluated using Bland-Altman and receiver operating characteristic(ROC)analysis.RESULTS The DL algorithm demonstrated repeatable measurements with a moderate number of images(three for each viewpoint)and high agreement across three premium ultrasound scanners.High diagnostic performance was observed across all viewpoints:Areas under the curve of the ROC to classify mild,moderate,and severe steatosis grades were 0.85,0.91,and 0.93,respectively.The DL algorithm outperformed or performed at least comparably to FibroScan control attenuation parameter(CAP)with statistically significant improvements for all levels on the unblinded histology-proven cohort and for“=severe”steatosis on the blinded histology-proven cohort.CONCLUSION The DL algorithm provides a reliable quantitative steatosis assessment across view and scanners on two multi-scanner cohorts.Diagnostic performance was high with comparable or better performance than the CAP.

关键词： Ultrasound Liver steatosis Deep learning Screening Computer-aided diagnosis

Influence of dynamic power dissipation on Si MRM modulation characteristics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2017年第7期15卷 42-45页

作者： Byung-Min yu Myungjin Shin Min-hyeong Kim Lars Zimmermann Woo-Young Choi Department of Electrical and Electronic Engineering Yonsei University Innovations for High Performance Microelectronics (IHP)

We experimentally observe that Si micro-ring modulator（MRM） modulation characteristics are strongly influenced by the modulation data rate and the data pattern and determine this influence is due to the temperature increase caused by dynamic power dissipation within the Si MRM device. We also quantitatively determine the amount of Si MRM resonance wavelength shift due to different modulation data rates, data patterns, and modulation voltages. Our results should be of great help for achieving reliable and optimal modulation characteristics for Si MRMs.

关键词： dissipation modulator quantitatively heating Figure thick electrically fabrication photonics buried

Characterization and Photocatalytic Efficiency of TiO_2 /Ti Beads Fabricated by Simple Heat-Treatment

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2012年第2期28卷 184-192页

作者： Altangerel Amarjargal Leonard D.Tijing Mi-hwa yu Chae-hwa Kim Chan-Hee Park Dong-Won Kim Cheol-Sang Kim Department of Bionanosystem Engineering Chonbuk National University Power Engineering School Mongolian University of Science and Technology Division of Mechanical Design Engineering Chonbuk National University Department of Industrial and Information Systems Engineering Chonbuk National University

The goal of the present study was to investigate the photocatalytic efficiency of titanium dioxide （TiO2） formed on titanium （Ti） bead substrate （referred herein as TiO2/Ti beads） by heat treatment when exposing to ultraviolet （UV） light irradiation. Escherichia coli was used as the model test organism. The results show 4-log and 7-log decrease in bacterial concentration after a test time of 15 and 120 min, respectively, using TiO2/Ti beads irradiated with UV light in a tin-foil covered beaker. This article presents the potential of TiO2 on Ti bead substrate formed by simple heat-treatment together with UV light for bacterial inactivation.

关键词： Photocatalysis Titanium dioxide Bacterial inactivation Heat treatment Escherichia coli

Effect of soy saponin on the growth of human colon cancer cells

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第27期16卷 3371-3376页

作者： Cheng-yu Tsai yue-hwa Chen Yi-Wen Chien Wen-Hsuan Huang Shyh-Hsiang Lin School of Nutrition and Health Sciences Taipei Medical University

AIM:To investigate the effect of extracted soybean saponins on the growth of human colon cancer cells.METHODS:WiDr human colon cancer cells were treated with 150,300,600 or 1200 ppm of soy saponin to determine the effect on cell growth,cell morphology,alkaline phosphatase(AP) and protein kinase C(PKC) activities,and P53 protein,c-Fos and c-Jun gene expression.RESULTS:Soy saponin decreased the number of viable cells in a dose-dependent manner and suppressed 12-Otetradecanol-phorbol-13-acetate-stimulated PKC activity(P < 0.05).Cells treated with saponins developed cytoplasmic vesicles and the cell membrane became rougher and more irregular in a dose-dependent manner,and eventually disassembled.At 600 and 1200 ppm,the activity of AP was increased(P < 0.05).However,the apoptosis markers such as c-Jun and c-Fos were not significantly affected by saponin.CONCLUSION:Soy saponin may be effective in preventing colon cancer by affecting cell morphology,cell proliferation enzymes,and cell growth.

关键词： Soy saponin Colon cancer Apoptosis Cell proliferation Cell differentiation