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Electrochemical performance of a symmetric supercapacitor device designed using laser-induced multilayered graphene

新型炭材料(中英文) 2024年

作者： Gargi Dhiman Kavita Kumari bon-Heun Koo Faheem Ahmed Nagih M.Shaalan Saurabh Dalela Parvez A.Alvi ranjeet Kumar Brajpuriya Shalendra Kumar Department of Physics School of Advanced EngineeringUPES Industrial Technology Research Institute Changwon National University Changwon Department of Applied Sciences and Humanities Faculty of Engineering and Technology Jamia Millia Islamia Department of Physics College of Science King Faisal University Physics Department Faculty of Science Assiut University Department of Pure & Applied Physics University of Kota Department of Physical Science

This study demonstrates a facile and economical approach for fabricating laser-induced graphene（lIG）, which results in improved electrochemical performance. Polyimide polymer was used as a starting material for lIG synthesis and irradiated under ambient conditions using a CO2laser. The prepared lIG samples were characterized by raman spectroscopy and FTIR, which validated the formation of multilayered graphene containing sp2 hybridized C=C bonds. The FE-SEM revealed three-dimensional sheetlike structures, while HR-TEM images displayed lattice planes with an interplanar spacing of approximately 0.33 nm, corresponding to the（002） plane of graphene. The electrochemical performance of the as-prepared lIG samples demonstrated a remarkable areal specific capacitance（CA） of 51 mF cm-2(170 F g-1) at 1 mA cm-2(3.3 A g-1) in a three-electrode configuration with 1M KOH as the aqueous electrolyte. The lIG electrodes produced an energy density of ～3.5 μWh cm-2and a power density of ～350 μW cm-2,demonstrating significant energy storage capabilities. Additionally, the electrodes exhibited excellent cyclic stability, retaining 87%of their specific capacitance after 3 000 cycles at 1 mA/cm2. The symmetric supercapacitor fabricated with lIG electrodes and the tested 1M KOH electrolyte showed a specific capacitance of 23 mF cm-2and maintained excellent retention after 10,000 cycles,showing lIG's potential for supercapacitor applications.

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SARS-CoV-2 aberrantly elevates mitochondrial bioenergetics to induce robust virus propagation

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Signal Transduction and Targeted Therapy 2024年第6期9卷 2702-2715页

作者： Hye Jin Shin Wooseong lee Keun bon Ku Gun Young Yoon Hyun-Woo Moon Chonsaeng Kim Mi-Hwa Kim Yoon-Sun Yi Sangmi Jun Bum-Tae Kim Jong-Won Oh Aleem Siddiqui Seong-Jun Kim Department of Convergent Research of Emerging Virus Infection Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea Gyeongnam Biohealth Research Center Gyeongnam Branch InstituteKorea Institute of ToxicologyJinju 52834Republic of Korea Center for Research Equipment Korea Basic Science InstituteCheongjuChungcheongbuk-do 28119Republic of Korea Department of Biotechnology Yonsei UniversitySeoul 03722Republic of Korea Division of Infectious Diseases School of MedicineUniversity of CaliforniaSan DiegoLa JollaCA 92093USA Present address:Department of Microbiology Chungnam National University School of MedicineDaejeon 35015Republic of Korea

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)is a‘highly transmissible respiratory pathogen,leading to severe multiorgan ***,knowledge regarding SARS-CoV-2-induced cellular alterations is *** this study,we report that SARSCoV-2 aberrantly elevates mitochondrial bioenergetics and activates the EGFR-mediated cell survival signal cascade during the early stage of viral ***-CoV-2 causes an increase in mitochondrial transmembrane potential via the SARS-CoV-2 RNAnucleocapsid cluster,thereby abnormally promoting mitochondrial elongation and the OXPHOS process,followed by enhancing ATP ***,SARS-CoV-2 activates the EGFR signal cascade and subsequently induces mitochondrial EGFR trafficking,contributing to abnormal OXPHOS process and viral *** EGFR inhibitors remarkably reduce SARS-CoV-2 propagation,among which vandetanib exhibits the highest antiviral *** of SARS-CoV-2-infected cells with vandetanib decreases SARS-CoV-2-induced EGFR trafficking to the mitochondria and restores SARS-CoV-2-induced aberrant elevation in OXPHOS process and ATP generation,thereby resulting in the reduction of SARS-CoV-2 ***,oral administration of vandetanib to SARS-CoV-2-infected hACE2 transgenic mice reduces SARS-CoV-2 propagation in lung tissue and mitigates SARS-CoV-2-induced lung *** also exhibits potent antiviral activity against various SARS-CoV-2 variants of concern,including alpha,beta,delta and omicron,in in vitro cell culture *** together,our findings provide novel insight into SARS-CoV-2-induced alterations in mitochondrial dynamics and EGFR trafficking during the early stage of viral infection and their roles in robust SARS-CoV-2 propagation,suggesting that EGFR is an attractive host target for combating COVID-19.

关键词： alterations aberrant thereby

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Contribution of Satellite Observations in the Optical and Microphysical Characterization of Aerosols in Burkina Faso, West Africa

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Atmospheric and Climate Sciences 2024年第1期14卷 154-171页

作者： Nébon Bado Serge Dimitri Bazyomo Germain Wende Pouiré Ouedraogo Bruno Korgo Mamadou Simina Dramé Florent P. Kieno Sié Kam laboratoire d’Energies Thermiques Renouvelables (l.E.T.RE) Université Joseph KI ZERBO Ouaga Burkina Faso laboratoire de Physique de l’Atmosphère et de l’Océan Siméon-Fongang Université Cheikh Anta DIOP Dakar-Fann Sénégal Institute of Mathematics and Physical Sciences University of Abomey-Calavi Porto-Novo Benin

In this work, we proceed to an optical and microphysical analysis of the observations reversed by the MODIS, SeaWiFS, MISR and OMI sensors with the aim of proposing the best-adapted airborne sensor for better monitoring of aerosols in Burkina Faso. To this end, a comparison of AOD between satellite observations and in situ measurements at the Ouagadougou site reveals an underestimation of AERONET AOD except for OMI which overestimates them. Also, an inter-comparison done based on the linear regression line representation shows the correlation between the aerosol models incorporated in the airborne sensor inversion algorithms and the aerosol population probed. This can be seen through the correlation coefficients R which are 0.84, 0.64, 0.55 and 0.054 for MODIS, SeaWiFS, MISR and OMI respectively. Furthermore, an optical analysis of aerosols in Burkina Faso by the MODIS sensor from 2001 to 2016 indicates a large spatial and temporal variability of particles strongly dominated by desert dust. This is corroborated by the annual and seasonal cycles of the AOD at 550 nm and the Angström coefficient measured in the spectral range between 412 nm and 470 nm. A zoom on a few sites chosen according to the three climatic zones confirms the majority presence of mineral aerosols in Burkina Faso, whose maxima are observed in spring and summer.

关键词： AERONET Airborne Sensors Aerosol Optical and Microphysical Properties

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Financial development and the cost of equity capital:Evidence from China

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China Journal of Accounting Research 2015年第4期8卷 243-277页

作者： Jeong-bon Kim Mary l.Z.Ma Haiping Wang College of Business Administration City University of Hong Kong School of Administrative Studies York University

This study examines the relation between province-level financial development and the cost of equity in *** main findings are that(1)stock market development reduces the cost of equity in general,but the effect diminishes significantly in state-owned enterprises(SOEs)and firms with high growth potential or innovation intensity and(2)banking development only marginally lowers the cost of equity,but the effect is stronger in *** analysis reveals that stock market development substitutes for such institutional factors as accounting quality,law enforcement,stock market integration and the split-share structure reform in lowering the cost of *** also find that lack of banking competition and banking marketization and under-development of the non-state economy partially account for the weak effect of banking development on the cost of equity.

关键词： Financial development Cost of equity capital law a

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Design of a long range nano-scale resolution mechanism

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第4期11卷 250-254页

作者： Shuo Hung CHANG Jen bon.lEE Department of Mechanical Engineering National Taiwan University

This paper presents the development of a coarse-fine dual precision positioning stage to achieve long travel range and high *** fine stage is arranged in series with a coarse *** key in the fine stage design is the choice of a toggle mechanism for a tight mechanical loop with high stiffness and *** designed the toggle mechanism for reduction of the displacement to suppress signal *** performance of the coarse and fine stages was verified with an optical encoder and capacitive sensor,*** measurement results show that the dual mechanism has a travel range of 1 mm and resolution of 30 nm.

关键词： Coarse-fine dual stage Nano-scale resolution Piezoelectric (PZT) actuator

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Effects of Ag Seed on Synthesis of FeCo Nano-Particles Prepared via the Polyol Method

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Journal of Materials Science & Technology 2010年第7期26卷 660-664页

作者： Uk-rae Cho Geun-Woo Kim bon-Heun Koo School of Nano and Advanced Materials Engineering Changwon National UniversityChangwonGyeongnam641-773Korea

Nano-particles have several interesting properties which are not shown in bulk materials because of their high ratio of surface area to volume. FeCo alloy nano-particles with soft magnetic properties are demanded for various applications such as optics, eletronics and magnetics. Through the polyol method, highly purified particles with mono-dispersibility in various sizes can be produced and used as high-tech functional materials. In this study, the magnetic characteristics of FeCo alloy with Ag seed added in the production process of mono-dispersed nano-particles through the polyol method were investigated.

关键词： Polyol method FeCo Ag Seed

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Pharmaceutical Statistics: Practical and Clinical Applications, Fifth Edition (Drugs and the Pharmaceutical Sciences) 5

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2010年

作者： Bolton Sanford Charles bon

来源：畅想之星图书光盘版（南... 评论

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Endoscopic shielding technique, a new method in therapeutic endoscopy

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World Journal of Gastroenterology 2017年第21期23卷 3761-3764页

作者： Ignacio bon ramon Bartolí Vicente lorenzo-Zúniga Institut Investigació en Ciències de la Salut Germans Trias i Pujol Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas Endoscopy Unit Department of GastroenterologyHospital Universitari Germans Trias i Pujol

Prevention of late complications after large endoscopic resection is inefficient with current *** shielding,as a simple and safe technique,has been proposed to improve the incidence of these *** methods,sheets or hydrogels,have showed proven efficacy in the prevention of late bleeding and perforation,as well as the improvement of tissue repair,in experimental models and in clinical practice.

关键词： Endoscopic shielding technique late complication Therapeutic endoscopy

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Arsenic Accumulation in Rice:Sources,Human Health Impact and Probable Mitigation Approaches

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Rice science 2022年第4期29卷 309-327页

作者： Md ROKONUZZAMAN lI Wai Chin MAN Yu bon TSANG Yiu Fai YE Zhihong Department of Science and Environmental Studies the Education University of Hong KongHong Kong 999077China School of life Sciences Sun Yat-Sen UniversityGuangzhou 510006China

The human body loading with arsenic(As)through rice consumption is a global health *** is a crucial need to limit As build-up in rice,either by remediating As accumulation in soils or reducing As levels in irrigation *** conventional approaches have been utilized to alleviate the As accumulation in ***,except for some irrigation practices,those approaches success and the adoption rate are not *** review presents human health risks posed due to consumption of As contaminated rice,evaluates different biomarkers for tracing As loading in the human body,and discusses the latest advancement in As reducing technologies emphasizing the application of seed priming,nanotechnology,and biochar application for limiting As loading in rice *** also evaluate different irrigation techniques to reduce As accumulation in *** water management regimes significantly reduces grain As ***-and nano-priming of rice seeds improve germination and minimize As translocation in rice tissues by protecting cell membrane,building pool around seed coat,methylation and volatilization,or quenching harmful effects of reactive oxygen *** application in the form of nano-adsorbents or nano-fertilizers facilitates nano-remediation of As through the formation of Fe plaque or sorption or oxidation *** biochar in the rice fields significantly reduces As through immobilization,physical adsorption,or surface *** conclusion,As content in cooked rice depends on irrigation source and raw rice As level.

关键词： arsenic rice scalp hair irrigation management seed priming nanotechnology biochar human health

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(EDTA)^(4-) supplements as superior modifier of the in-vitro-degradation properties of the magnesium alloy coated through discharge-assisted process

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Journal of Magnesium and Alloys 2023年第3期11卷 945-957页

作者： Zeeshan Ur rahman Maqsood Ali Ye-Tang Pan David G.Churchill bon Heun Koo College of Mechatronic Engineering Changwon National UniversityChangwonGyeongsangnam-doRepublic of Korea Department of Regenerative Medicines College of MedicinesSoonChunhyang UniversityCheonanRepublic of Korea National Engineering Technology Research Center of Flame Retardant Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijingPR China Department of Chemistry Molecular Logic Gate LaboratoryKorea Advanced Institute of Science and Technology(KAIST)Republic of Korea

The(EDTA)^(4-)organic substituents were supplemented with alkaline silicates electrolyte,however in varying concentration to explore the microstructure,chemical composition and subsequent effects on the biodegradation of the PEO coated Mg AZ91 *** surface analysis-,carried out through SEM,samples with zero-(EDTA)^(4-)were found-,lacking pancake structural features;however,supplementing electrolyte with(EDTA)^(4-),bulky and layered pancakes were obtained with minimum cracks and minimum porosity for *** the phase and inner layer analysis,it was found that EDTA can significantly alter the surface layers composition and could act as a passivation agent-;however,individual polycrystalline phases were not found to *** hardness value obtained for EDT-1 was~909.69 HV,the highest value found here which occurs with the shallowest indents found in this ***-vitro degradation analysis was carried out using potentiodynamic polarization at room temperature,cyclic polarization at RT and high fever conditions(HFT~40°C).The corrosion potential for coated AZ91 was obtained as a positive value of~0.1 V,for the first time in the PEO research;however,the results were not supported by the cyclic polarization tests at room temperature and at *** post corrosion microstructural analysis confirmed the effective role of EDTA up to 1.0 g·l^(-1)and revealed the formation of thin films during the forward polarization at HFT.

关键词： EDTA Soft plasma Magnesium Biodegradation Corrosion SBF

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