检索结果-南通市图书馆

Construction of 2D/2D Ti_(3)C_(2)T_(x)MXene/CdS heterojunction with photothermal effect for efficient photocatalytic hydrog.n production

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technolog. 2024年第4期171卷 1-9页

作者： T.Y.Huang.z.yang S.Y.yang z.H.Dai Y.J.Liu J.H.Liao g.Y.z.ong.z.J.Xie Y.P.Fang.S.S.z.ang Key Laboratory for Biobased Materials and Energ. of Ministry of Education Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China School of Chemical Eng.neering.and Energ. Technolog. Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

The insensitivity of semiconductors to visible and infrared lig.t is a key constraint on the utiliz.tion of lig.t energ. in photocatalytic *** photocatalysts with full-spectrum absorption throug. surface eng.neering.is an effective approach to fully harnessing.lig.t energ. in semiconductor ***,a novel stable Ti_(3)C_(2)T_(x)MXene/CdS heterojunction catalyst is obtained by in-situ epitaxial g.owth of two-dimensional(2D)CdS nanosheets on 2D MXene interface via a solvothermal *** exceptional lig.t absorption properties of MXene confer outstanding.full-spectrum driven photocat-alytic hydrog.n evolution capability upon the heterog.neous *** unique 2D/2D structure effectively mitig.ted the recombination of photog.nerated carriers,enhancing.the photocatalytic performance of the ***,the composite catalyst exhibits a sig.ificantly hig.er surface temperature of 80.4℃under visible lig.t irradiation at an intensity of 0.1 W/cm^(2),which is 1.84 times hig.er than that of *** irradiation of visible and near infrared lig.t,the composite catalyst with photothermal ef-fect demonstrates a remarkable hydrog.n evolution rate of 65.4 mmol g.(-1)h^(-1),which is 7.2 times hig.er than that of CdS *** study introduces a novel approach for constructing.full-spectrum absorption catalysts and expands the application of the photothermal effect in photocatalytic hydrog.n evolution research.

关键词： Two-dimensional structure Heterostructure Photothermal effect Photocatalyst Hydrog.n evolution

Precipitation of multi-type nano-quasicrystals in a Mg.z.-Y alloy

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 Mag.esium and Alloys 2024年第3期12卷 997-1008页

作者： W.z.Wang.X.z.z.ou L.F.z.ang.H.Q.Ye z.Q.yang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji Hua Laboratory Foshan 528251China Foshan University Foshan 528231China

Mg.6z.-1Y(at.%)ribbons with streng.hening.precipitates of multi-type nanoquasicrystals were prepared by melt-spinning.followed by ag.ng.*** evolution of the rapidly solidified ribbons during.isothermal ag.ng.was comprehensively studied using.various electron microscopy *** new kinds of decag.nal quasicrystals were formed in ag.d ribbons,in addition to precipitation of nanometer icosahedral ***-resolution observations reveal that both decag.nal quasicrystals can be modeled by quasiperiodic tiling.with decag.nal clusters of 2.5 nm in diameter,but overlap of neig.boring.clusters in both decag.nal quasicrystals is different from the g.mmelt model observed in other quasicrystals.A shell composed of complex Laves Mg.z. domains was formed surrounding.each decag.nal quasicrystal precipitate upon prolong.d *** addition,all kinds of nanoprecipitates exhibit excellent structure and siz. stability at 573 *** finding. may have implications for not only fundamental studies about quasicrystals,but also microstructural manipulation of hig.-performance Mg.alloys.

关键词： Quasicrystal Mg.alloys Rapid solidification Scanning.transmission electron microscopy.

Nitrog.n mineraliz.tion in the oldest climax communities in the eastern Mediterranean reg.on

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第1期35卷 213-228页

作者： Fatma Selcen Sakar g.rcan g.leryüz Department of Biolog. Section Ecology GörükleGraduate School of Natural and Applied ScienceUniversity of Bursa Uludağ16059 NilüferBursaTurkey Department of Biolog. Section Ecology GörükleFaculty of Science and ArtsUniversity of Bursa Uludağ16059 NilüferBursaTurkey

In this study,we investig.ted how tree species affect N mineraliz.tion in connection to some soil properties and seconder metabolite levels of litter,in the soil of the old-est native forest *** the oldest pure communi-ties of Pinus nig.a(PN),Fag.s orientalis(FO),and Abies bornmuelleriana(AB)in the mountain rang. of Mount Uludağ,Bursa,Turkey,annual net yield and N mineraliz.-tion in the 0-5-and 5-20-cm soil layers were determined in a field incubation study over 1 *** locations were chosen from 1300 to 1600 m a.s.l.,and moisture content(%),pH,water-holding.capacity(%),org.nic C,total N,and C/N ratio,and annual net mineral N yield of the soil and hydro-lyz.d tannic acid and total phenolic compounds in litter were compared for these forest *** had the hig.est annual net Nmin yield(43.9±4.8 kg.ha^(-1) a^(-1)),*** the lowest(30.5±4.2 kg.ha^(-1) a^(-1)).Our finding. show that in the oldest forest ecosystems,the seasonal soil moisture content and tree species play an essential role in N cycling.and that hydrolyz.d tannic acids and total phenolic compounds effectively control N *** acid and total phenolics in the litter were found to inhibit nitrification,but total phenolics were found to stimulate ammonification.

关键词： Oldest forest communities Nitrog.n mineraliz.tion Nitrification Tannic acid Total phenolic Litter

Numerical Study of Flow Features Around Submerg.d Circular and Square Piles at Flat and Scoured Beds Using.OpenFOAM

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第4期23卷 897-914页

作者： WANg.Chaolin WU g.oxiang.WANg.Dianhe DU Sheng.ao z.ANg.z.iyong.JIN Heng.z.U David z. LIANg.Bing.hen Dong.ai Academy School of Civil&Environmental Engineering and Geography ScienceNingbo UniversityNingbo 315211China Key Laboratory of Estuary and Coast of z.ejiang.Province and Zhejiang Institute of Hydraulics and EstuaryHangzhou 310020China Shandong.Provincial Key Laboratory of Ocean Eng.neering and College of EngineeringOcean University of ChinaQingdao 266100China Shandong.Water Conservancy Vocational Colleg. Rizhao 276826China School of Mechanical and Energ. Eng.neering Ningbotech UniversityNingbo 315211China

Elucidating.the flow features around piles in local scouring.processes is crucial for studies of local scouring.mechanisms and scour depth *** study details the flow turbulence characteristics of two submerg.d piles that are determined by solving.the Navier-Stokes equations with the improved delayed detached eddy simulation *** model is verified by comparing.experimental and numerical results for hydrodynamic parameters with the literature for both square-crossing.piles(SCPs)and circular-crossing.piles(CCPs).Orig.nal topog.aphies of flat and scoured beds(i.e.,the initial and equilibrium scouring.stag.s)are based on experimental results obtained by the authors in the present *** and CCP flow features in the scouring.process are *** results indicate that during.the scouring.process,the time-averag.d drag.coefficient and root mean square(rms)of the lift coefficient increase linearly in the CCP test,while the rms of the lift coefficient in the SCP test decreases ***,the minimum pressure coefficient is always located in the upstream corners in the SCP case but moves from 72.5°to 79.5°when the scour hole is completely developed in the CCP *** flow behind the pile,which is g.nerated by separated boundary layers above the top face of the pile,can reach the sand bed and turn the separated shear layers into patches of small vortices in the near-wake ***,the hig. shear stress z.nes are mainly at the scour edg.s under scoured-bed conditions.

关键词： flat bed scoured bed local scour OpenFOAM bed shear stress

Esophag.al inserted subclavian catheter:a rare complication

在线全文

学校读者我要写书评

暂无评论

World Journal of Emerg.ncy Medicine 2024年第3期15卷 243-245页

作者： DilberÜçöz.Kocaşaban Sertaçg.ler Emerg.ncy Medicine Clinic Health Sciences University Ankara Training and Research HospitalAnkara 06930Turkey

Central venous catheteriz.tion(CVC) is an invasive procedure for administering.fluids,nutrients,and drug.;monitoring.central venous pressure;performing.pulmonary artery catheteriz.tion;and placing.transvenous pacemakers in intensive care units and all specialties,from anesthesia to emerg.ncy medicine,for the treatment of trauma and hemodynamically unstable pediatric and adult patients.[1,2]Complications have been observed in more than 15% of patients who underwent ***,infectious,and thrombotic complications have been reported in 5%–19%,5%–26%,and 2%–26% of patients,respectively.[3] Malposition,on the other hand,is common in subclavian catheter insertion and is usually associated with an initially misplaced g.idewire.[4]

关键词： unstable insertion initially

Structural basis for polyuridine tract recog.ition by SARS-CoV-2 Nsp15

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2024年第7期15卷 547-552页

作者： Fumiaki Ito Hanjing.yang z.Hong.z.ou Xiaojiang.S.Chen Molecular and Computational Biolog. Department of Biological SciencesUniversity of Southern CaliforniaLos AngelesCA 90089United States Department of Microbiolog. Immunology and Molecular GeneticsUniversity of CaliforniaLos AngelesCA 90095United States California NanoSystems Institute University of CaliforniaLos AngelesCA90095United States g.netic Molecular and Cellular Biology ProgramKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCA 90089United States Norris Comprehensive Cancer Center University of Southern CaliforniaLos AngelesCA 90089United States Center of Excellence in NanoBiophysics University of Southern CaliforniaLos AngelesCA 90089United States

Dear Editor,Coronaviruses have evolved a wide array of tactics to evade host antiviral *** host cells detect invading.foreig. nucleic acids including.viral g.nome and viral replication intermediates,they activate interferon(IFN)sig.aling.via cytoplasmic pattern recog.ition receptors(Kang.et al.,2002;Kato et al.,2006).Remarkable stealth activities exhibited by coronaviruses are facilitated by a series of non-structural proteins(Nsps),such as Nsp15(Deng.and Baker,2018;Deng.et al.,2019;Hackbart et al.,2020),which is a uridine-specific endoribonuclease that mediates evasion of host detection of viral double-stranded RNA(dsRNA)(Bhardwaj et al.,2004;Deng.et al.,2017;Fraz.er et al.,2021;Ivanov et al.,2004).Nsp15 targ.ts a polyuridine[poly(U)]tract on the coronavirus neg.tive strand RNA(Hackbart et al.,2020).Nsp15 limits the abundance and leng.h of poly(U)within the neg.tive strand RNA 5ʹ-extension by trimming.down the initially synthesiz.d poly(U)lead sequence to the optimal leng.h that can suppress dsRNA formation but still serves as a template for poly(A)tail of the positive strand g.nome of the coronaviruses(Hofmann and Brian,1991).

关键词： p15 interferon template

Stability Investig.tion and Improvement for DC Cascade Systems with Simplified Impedance-based Stability Criterion

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energ. Systems 2024年第3期10卷 1044-1052页

作者： Junbin Fang.z.ikang.Shuai yang Li z.ibing.Wang.Xiang.0} Wu Xia Shen z.John Shen Colleg. of Electrical and Information Eng.neering Hunan UniversityChangsha 410082China Renewable Energ. Department of China Electric Power Research Institute Beijing 100192China Department of Electrical and Computer Eng.neering Illinois Institute of TechnologyChicagoIL 60616USA IEEE

In DC distributed power systems(DPSs),the complex impedance interactions possibly lead to DC bus voltag. oscillation or *** previous research,the stability analysis of DPSs is implemented based on mathematical analysis in control *** specific mechanisms of the instability of the cascade system have not been intuitively *** this paper,the stability analysis of DPSs based on the traditional Nyquist criterion is simplified to the resonance analysis of the seriesconnected port impedance(z.R+jX)of source and load *** reveals that the essential reason for impedance instability of a DC cascade system is that the neg.tive damping.characteristic(Rz.ro-crossing.*** simplified stability criterion for DC cascade systems can be concluded as:in the neg.tive damping.frequency rang.s(Rz.ro-crossing.point of the reactance component(i.e.,X=0).According.to the proposed stability criterion,the oscillation modes of cascade systems are classified.A typical one is the internal impedance instability excited by the neg.tive damping.and the other one is that the external disturbance amplified by neg.tivity in a low stability ***,the impedance reshaping.method for stability improvement of the system can be further *** validity of the simplified criterion is verified theoretically and experimentally by a positive damping.reshaping.method.

关键词： DC cascaded system,impedance model impedance reconstruction stability criterion

Transient Characteristics and Accommodative Current Limiting.Strateg. for Bidirectional Interlinking.Converters in Hybrid AC/DC Microg.ids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energ. Systems 2024年第4期10卷 1575-1588页

作者： Xia Shen z.ikang.Shuai Wen Huang.Chao Shen yang Shen z.John Shen Colleg. of Electrical and Information Eng.neering Hunan UniversityChangsha 410082China Department of Electrical and Computer Eng.neering Illinois Institute of TechnologyChicagoIL 60616 USA

Bidirectional interlinking.converter(BIC)is the core equipment in a hybrid AC/DC microg.id connected between AC and DC ***,the variety of control modes and flexible bidirectional power flow complicate the influence of AC faults on BIC itself and on DC sub-g.id,which potentially threaten both converter safety and system *** study first investig.tes AC fault influence on the BIC and DC bus voltag. under different BIC control modes and different pre-fault operation states,by developing.a mathematical model and equivalent sequence ***,based on the analysis results,a g.neral accommodative current limiting.strateg. is proposed for BIC without limitations to specific mode or operation *** amplitude is predicted and constrained according.to the critical requirements to protect the BIC and relieving.the AC fault influence on the DC bus *** with conventional methods,potential current limit failure and distortions under asymmetric faults can also be ***,experiments verify feasibility of the proposed method.

关键词： Bidirectional interlinking.converter current limiting fault characteristic hybrid AC/DC microg.id variation/oscillation of DC bus voltag.

Climate Chang.s and Sustainability

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Ecolog. 2024年第1期14卷 17-53页

作者： Kholoud z. g.anem Department of Biolog.cal Science College of Science & Humanities Shaqra University Riyadh Saudi Arabia

Climate chang. is the phrase used to describe long.term chang.s in temperatures and weather patterns. Chang.s in the atmosphere and their interactions with diverse g.olog.c, chemical, biolog.cal, and g.og.aphic variables are the main contributors to this cyclical adjustment of the Earth’s climate. Such chang.s may be induced purposefully, because of burning.fossil fuels, clearing.forests, and raising.animals, or they may be natural, broug.t on by sig.ificant volcanic eruptions or variations in the sun’s activity. By sig.ificantly increasing.the amount of g.eenhouse g.ses already in the atmosphere, this heig.tens the g.eenhouse effect and contributes to g.obal warming. This work includes several additional theoretical and practical explanations of sustainable development. The theoretical work encompasses hundreds of researches that identify requirements for how development routes mig.t satisfy sustainable development (SD) criteria using.economic theory, complex systems approach, ecolog.cal science, and other techniques. The ag.eements made by the Parties in various nations across the world will consider a wide rang. of perspectives about what would be considered undesirable effects on the environment, the climate system, sustainability, economic g.owth, or food production.

关键词： Earth System Ancient Climatic Chang.s Causes of Climatic Chang.s Ecolog.cal Risk Assessment Ecosystem Abrupt Climate Chang. of Earth Sustainability