检索结果-南通市图书馆

Journal of Rare Earths 2024年第1期42卷 46-56,I0002页

作者： L.Vijayalakshmi K.Naveen Kumar jong dae baek Department of Automotive Engineering Yeungnam UniversityGyeongsanGyeongbuk38541Republic of Korea Department of Mechanical Engineering Yeungnam UniversityGyeongsan38541Republic of Korea

A set of co-doped(Tb^(3+)/Dy^(3+))lithium zinc borate(LZB)glasses were developed by melt *** structural evaluation was performed for synthesized glassy *** Dy^(3+)and Tb^(3+)individually doped glasses exhibit intense yellow and green luminescence bands at 575 nm(^(4)F_(9/2)→^(6)H_(13/2))and543 nm(^(5)D_(4)→^(7)F_(5)),*** sensitization effect of Dy^(3+)on Tb^(3+)was analyzed by increasing the Tb^(3+)content with respect to the optimum Dy^(3+)content(0.5 mol%)in Dy^(3+)/Tb^(3+).The spectral overlay of Dy^(3+)luminescence and Tb^(3+)absorption profiles,Dy^(3+)/Tb^(3+)PL spectra under different excitations 352,362,376,and 385 nm,shortening decay lifetimes of Dy^(3+)in Dy^(3+)/Tb^(3+)co-activated glasses,energy transfer(ET)parameters,chromaticity coordinates and their corresponding correlated temperatures all help to explain ET from Dy^(3+)to Tb^(3+).At 385 nm of Dy^(3+)excitation,the optimized co-activated(0.5Dy^(3+)+1.0Tb^(3+)):LZB glass displays cool white light *** non-radiative ET from Dy^(3+)to Tb^(3+)is dominated by electric dipole-dipole interaction and its ET efficiency was calculated to be 63%.At the same time,reverse ET from Tb^(3+)to Dy^(3+)was also *** shift in color coordinates from dominant yellow to greenish-yellow,green and white light emission suggests that Dy^(3+)/Tb^(3+)coactivated LZB glasses can be a potential candidate for UV converted multicolor and white light emitting devices.

关键词： Rare earths Photoluminescence Energy transfer Spectral overlap Decay lifetime Multicolor emitting LEDs

A Solvent-Free Covalent Organic Framework Single-Ion Conductor Based on Ion-Dipole Interaction for All-Solid-State Lithium Organic Batteries

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第12期16卷 189-200页

作者： Zhongping Li Kyeong-Seok Oh Jeong-Min Seo Wenliang Qin Soohyoung Lee Lipeng Zhai Changqing Li jong-Beom baek Sang-Young Lee Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-RoSeodaemun-GuSeoul 03722Republic of Korea School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)50 UNIST-GilEonyang-EupUlju-GunUlsan 44919Republic of Korea Henan Key Laboratory of Functional Salt Materials Center for Advanced Materials ResearchZhongyuan University of TechnologyZhengzhou 450007People’s Republic of China Department of Battery Conflation Engineering Yonsei University50Yonsei-RoSeodaemun-GuSeoul 03772Republic of Korea Department of Battery Engineering Yonsei University50Yonsei-RoSeodaemun-GuSeoul 03772Republic of Korea

Single-ion conductors based on covalent organic frameworks(COFs)have garnered attention as a potential alternative to currently prevalent inorganic ion conductors owing to their structural uniqueness and chemical ***,the sluggish Li+conduction has hindered their practical ***,we present a class of solvent-free COF single-ion conductors(Li-COF@P)based on weak ion-dipole interaction as opposed to traditional strong ion-ion *** ion(Li+from the COF)-dipole(oxygen from poly(ethylene glycol)diacrylate embedded in the COF pores)interaction in the Li-COF@P promotes ion dissociation and Li+migration via directional ionic *** by this single-ion transport behavior,the Li-COF@P enables reversible Li plating/stripping on Li-metal electrodes and stable cycling performance(88.3%after 2000 cycles)in organic batteries(Li metal anode||5,5’-dimethyl-2,2’-bis-p-benzoquinone(Me2BBQ)cathode)under ambient operating conditions,highlighting the electrochemical viability of the Li-COF@P for all-solid-state organic batteries.

关键词： Solid organic single-ion conductors Solvent-free covalent organic frameworks All-solid-state Li organic batteries Ion-dipole interaction Pore functionalization

Real-Time Tunable Gas Sensing Platform Based on SnO_(2) Nanoparticles Activated by Blue Micro-Light-Emitting Diodes

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第12期16卷 103-119页

作者： Gi baek Nam Jung-El Ryu Tae Hoon Eom Seung Ju Kim Jun Min Suh Seungmin Lee Sungkyun Choi Cheon Woo Moon Seon Ju Park Soo Min Lee Byungsoo Kim Sung Hyuk Park Jin Wook Yang Sangjin Min Sohyeon Park Sung Hwan Cho Hyuk Jin Kim Sang Eon Jun Tae Hyung Lee Yeong Jae Kim Jae Young Kim Young Joon Hong jong-In Shim Hyung-Gi Byun Yongjo Park Inkyu Park Sang-Wan Ryu Ho Won Jang Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Research Laboratory of Electronics Department of Mechanical EngineeringMassachusetts Institute of TechnologyCambridgeMA 02139USA Ming Hsieh Department of Electrical and Computer Engineering University of Southern CaliforniaLos AngelesCA 90089USA Department of Display Materials Engineering Soonchunhyang UniversityAsan 31538Republic of Korea Department of Photonics and Nanoelectronics BK21 FOUR ERICA-ACE CenterHanyang University ERICAAnsan 15588Republic of Korea Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Republic of Korea Department of Electronics Information and Communication EngineeringKangwon National UniversitySamcheok 25913Republic of Korea Advance Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Physics Chonnam National UniversityGwangju 500-757Republic of Korea

Micro-light-emitting diodes(μLEDs)have gained significant interest as an activation source for gas sensors owing to their advantages,including room temperature operation and low power ***,despite these benefits,challenges still exist such as a limited range of detectable gases and slow *** this study,we present a blueμLED-integrated light-activated gas sensor array based on SnO_(2)nanoparticles(NPs)that exhibit excellent sensitivity,tunable selectivity,and rapid detection with micro-watt level power *** optimal power forμLED is observed at the highest gas response,supported by finite-difference time-domain ***,we first report the visible light-activated selective detection of reducing gases using noble metal-decorated SnO_(2)*** noble metals induce catalytic interaction with reducing gases,clearly distinguishing NH3,H2,and ***-time gas monitoring based on a fully hardwareimplemented light-activated sensing array was demonstrated,opening up new avenues for advancements in light-activated electronic nose technologies.

关键词： Micro-LED Gas sensor array Low power consumption Metal decoration Real-time detection

Effect of Squeeze Cast Process Parameters on Fluidity of Hypereutectic Al-Si Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2008年第1期24卷 7-11页

作者： jong-Kyu baek Hae-Wook Kwon School of Materials Science and Engineering Yeungnam University Gyeongsan 712-749 Korea

The effects of processing variables on the fluidity of hypereutectic Al-Si alloy melt during squeeze casting were *** maximum fluidity of Al-16.0%Si alloy during squeeze casting was obtained under the applied pressure of 30 *** fluidity increased with *** fluidity increased with silicon content in the range from 12.0% to 20.0%.That was decreased respectively by eutectic modification and primary silicon refinement.

关键词： Squeeze casting Al-alloy Fluidity Melt treatment

Wavelet Estimation in Heteroscedastic Model Under Censored Samples

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第12期23卷 2253-2268页

作者： Han Ying LIANG jong IL baek Department of Mathematics Tongji University Shanghai 200092 P. R. China School of Mathematics & Informational Statistics and Institute of Basic Natural Science Wonkwang University Ik-San 570-749 South Korea

Consider the heteroscedastic regression model Yi = g（xi）＋ σiei, 1 ≤ i ≤ n, where σi^2 = f（ui）, here （xi, ui） being fixed design points, g and f being unknown functions defined on [0, 1], ei being independent random errors with mean zero. Assuming that Yi are censored randomly and the censored distribution function is known or unknown, we discuss the rates of strong uniformly convergence for wavelet estimators of g and f, respectively. Also, the asymptotic normality for the wavelet estimators of g is investigated.

关键词： censored sample heteroscedastic regression model wavelet estimator strong unform convergence rate asymptotic normality

A thorough analysis of the effect of surfactant/s on the solubility and pharmacokinetics of (S)-zaltoprofen

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Pharmaceutical Sciences 2019年第4期14卷 435-444页

作者： Cuong Viet Pham jong-Suep baek jong-Hun Park Sang-Hun Jung jong-Seong Kang Cheong-Weon Cho College of Pharmacy and Institute of Drug Research and Development Chungnam National UniversityDaejeon 34134Republic of Korea Department of Herbology College of Korean MedicineDongguk UniversityGyeongju 38066Republic of Korea

Until now, there are no publications about the preformulation studies on(S)-zaltoprofen((S)-ZPF). Hence, we first investigated the solubility of(S)-ZPF, screened solubilizers and performed the pharmacokinetic study of(S)-ZPF in the presence of the solubilizers. The measurement of the solubility of(S)-ZPF in 26 different solvents was carried out, including d-alpha tocopheryl polyethylene glycol 1000 succinate(TPGS), 2-hydroxypropyl-β-cyclodextrin(HPCD), and mixtures of individual solvent. The plasma concentration of(S)-ZPF and the amount of(S)-ZPF retained in stomach were determined after oral(35.0 mg/kg) and intravenous(5.0 mg/kg) administration. The solubility of(S)-ZPF showed an increase of 484-fold in TPGS compared to its aqueous solubility. There was a significant increase of AUC 0-24 h for pure(S)-ZPF in the TPGS group(813.59 ± 64.17 μg h/ml) in comparison with AUC 0-24 h in the HPCD group(595.57 ± 71.76 μg h/ml) and water group(465.57 ± 90.89 μg h/ml). In addition, the T max of(S)-ZPF in the TPGS group was 2 h, much faster than that in the HPCD or water groups(5.50 or 5.67 h, respectively). This suggested that TPGS played a significant role in the increase of solubility and bioavailability of(S)-ZPF.

关键词： (S)-zaltoprofen Solubility Bioavailability D-alpha tocopheryl polyethylene glycol 1000 succinate 2-hydroxypropyl-β-cyclodextrin

Serum amyloid A induces WISH cell apoptosis

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第1期28卷 73-80页

作者： Seong-ho JO Jeanho YUN jong-min KIM Suk-hwan baek Yoe-sik BAE Medical Research Center for Cancer Molecular Therapy College of MedicineDong-A University Busan 602714 Korea Departments of Biochemistry and Cell Biology College of MedicineDong-A UniversityBusan 602714Korea Departments of Biochemistry and Cell Biology College of MedicineDong-A UniversityBusan 602714Korea Departments of Anatomy and Cell Biology College of MedicineDong-A UniversityBusan 602714Korea Department of Biochemistry and Molecular Biology College of MedicneYeungnam UniversityDaegu 705717Korea Departments of 3 Biochemistry and Cell Biology College of MedicineDong-A UniversityBusan 602714Korea

Aim:Serum amyloid A(SAA)is an important mammalian acute ***,weaim to investigate the effect of SAA on apoptosis and its mechanism of action inhuman amniotic WISH ***:The expression of formyl peptide receptor(FPRL1),which is reported as a SAA receptor,was tested using RT-PCR andligand binding assay with radio-labeled FPRL1 *** effect of SAA onproliferating cell population was evaluated by thymidine incorporation *** protein phosphorylation levels and caspase-3 activity were detected by West-ern blot ***:SAA inhibits thymidine incorporation in human amnioticWISH cells.A SAA-induced decrease of proliferating cell population was accom-panied with nuclear condensation and caspase-3 activation in WISH cells,sug-gesting that SAA induces WISH cell *** FPRL1 has been reportedas a SAA receptor,we investigated the effects of several FRPL1 agonists on aproliferating cell population in WISH *** the tested FPRL1 agonists,only SAA induced a decrease of proliferating cell population in WISH *** downstream signaling of SAA,we found that SAA stimulated extracellularsignal-regulated kinase and p38 kinase,which were not inhibited by pertussistoxin(PTX),ruling out the role of PTX-sensitive *** a SAA-induced decrease of proliferating cell population was not affected by PTX,sug-gesting that SAA inhibits WISH cell apoptosis in a PTX-sensitive G-protein-independent manner.A SAA-induced decrease of a proliferating cell populationwas completely blocked by PD98059 and SB203580,suggesting that mitogen-activated protein kinase activities are essentially required for the ***:SAA is a novel inducer for WISH cell apoptosis,and the PTX-insen-sitive pathway is involved in the process.

关键词： serum amyloid A apoptosis caspase-3 ex tracellular signal regulated protein kinase p38 kinase

Active Site Engineering in Transition Metal Based Electrocatalysts for Green Energy Applications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Accounts of Materials Research 2021年第3期2卷 147-158页

作者： Feng Li Gao-Feng Han jong-Beom baek School of Energy and Chemical Engineering/Center for Dimension-Controllable Organic Frameworks Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919South Korea

CONSPECTUS:Hydrogen is widely considered an ideal green energy carrier and a leading candidate to replace nonrenewable fossil fuels and address serious global energy and environmental pollution *** worldwide are engaged in developing various technologies related to hydrogen energy exploitation and conversion,such as photocatalytic/electrocatalytic water splitting,fuel cells,and so *** water splitting using electric energy can produce clean and pure hydrogen from water on a large scale,which can be further directly converted into electric energy by fuel *** environmentally friendly system relies on a series of important reactions,especially the hydrogen evolution reaction(HER)and oxygen reduction reaction(ORR),which both require high efficiency and durable *** the tremendous efforts of the scientific community,electrocatalysts with satisfactory performance are still *** the heart of electrocatalysts,active sites are key to catalytic *** site engineering,by tuning the nature of the active sites in the electrocatalysts,offers an important opportunity to improve the performance of ***,the strategies for active site engineering involve(1)tailoring the environment around the active sites and(2)engineering the structure of the active *** approaches can be used to optimize the electronic properties of the active sites,balance the binding energies between the active sites and the reactants/intermediates/products,and thus accelerate the overall reaction *** this Account,we summarize the recent progress made in our laboratory on active site engineering in transition metal based electrocatalysts for green energy *** start with metal nanoparticle electrocatalysts,engineering Ru nanoparticles on different supports,to achieve more efficient electrocatalytic HER ***,after we theoretically predicted that the hydrogen adsorption/desorption o

关键词： Transition replace arrangement

Long-term performance of fiber-grid-reinforced asphalt overlay pavements: A case study of Korean national highways

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2019年第4期6卷 366-382页

作者： jong-Hoon Lee Seung-Beom baek Kang-Hoon Lee Jo-Soon Kim Jin-Hoon Jeong Department of Civil Engineering Inha UniversityIncheon 22212South Korea Civil&Environmental BG Doosan Engineering&ConstructionSeoul 06057South Korea Department of Infrastructure Safety Research Korea Institute of Civil Engineering and Building TechnologyGoyang-si 10223South Korea SN Construction Co. LtdDaejeon 34573South Korea

The objective of this study was to verify the effect of fiber grid reinforcement on the longterm performance of asphalt overlay pavements by performing field investigation, laboratory test, and finite element analysis. Crack, rutting, roughness, and other miscellaneous distresses of fiber-grid-reinforced overlay sections and ordinary overlay sections were compared. Pavement conditions of fiber grid overlay sections before and after the overlay were also compared. Cores were obtained from the fiber-grid-reinforced and ordinary sections to measure bonding shear strength between the intermediate and overlay *** energy, displacement after yield, and shear stiffness of the cores were also obtained by analyzing the test results. Finite element analysis was performed by using the test results to validate the effect of the fiber grid reinforcement on the long-term performance of asphalt overlay pavements. Rutting and fatigue cracking were predicted for three cases: 1) fiber grid was not used;2) glass fiber grid was used;and 3) carbon fiber grid was used. The cracking ratio of fiber-grid-reinforced sections was much smaller than that of ordinary sections. The results of field investigation, laboratory test, and finite element analysis showed that the fiber grid reinforcement improved the long-term performance of asphalt overlay pavements.

关键词： Asphalt pavement Fiber grid reinforcement Overlay pavement Finite element analysis Bonding shear strength

Kinetics modeling for the mixed reforming of methane over Ni-CeO_2/MgAl_2O_4 catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2011年第1期20卷 9-17页

作者： Hye Jin Jun Myung-June Park Seung-Chan baek jong Wook Bae Kyoung-Su Ha Ki-Won Jun Department of Chemical Engineering Ajou University Petroleum Displacement Technology Research Center Korea Research Institute of Chemical Technology (KRICT)

Kinetics model was developed for the mixed （steam and dry） reforming of methane, which is useful for the control of H2/CO ratio. The equilibrium constants of reaction rate were determined using the experimental equilibrium data at different reaction temperatures, while the forward reaction rate constants were estimated using the experimental data under non-equilibrium （high inert fraction and high space velocity） conditions. The comparison between calculated and experimental data clearly showed that the developed model described satisfactorily, and further analysis using the parametric sensitivity determined the wall temperature and CO2 fraction in the feed gas as effective parameters for the manipulation of CH4 conversion and H2/CO ratio of synthesis gas under the equilibrium condition. Meanwhile, the inert fraction, rather than the residence time, was selected as additional parameter under non-equilibrium condition.

关键词： mixed reforming nickel-based catalyst kinetics modeling parameter estimation parametric sensitivity