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On the Simulation of.Ind.strial Gas d.namic Applications with the d.sconti- nuous Galerkin Spectral Element Method

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Journal of.Thermal Science 2016年第3期25卷 250-257页

作者： f. Hempert M. Hof.mann U. Iben C.-d. Munz Robert-Bosch GmbH Robert-Bosch Campus 1 71272 Renningen Germany Institute of.Aerod.namics and.Gas d.namics Pfaffenwaldring 21 70569 Stuttgart Germany

In the present investigation, we d.monstrate the capabilities of.the d.scontinuous Galerkin spectral element method.f.r high ord.r accuracy computation of.gas d.namics. The internal f.ow f.eld.of.a natural gas injector f.r bivalent combustion engines is investigated.und.r its operating cond.tions. The simulations of.the f.ow f.eld.and.the aeroacoustic noise emissions were in a good.agreement with the cxperirnental d.ta. We tested.several shockcapturing techniques f.r the d.scontinuous Galerkin scheme. Based.on the valid.ted.f.amework, we analyzed.the d.velopment of.the supersonic jets d.ring d.f.erent opening proced.res of.a compressed.natural gas injector. The results suggest that a more grad.al injector opening d.creases the noise emission.

关键词： d.scontinuous Galerkin natural gas injection supersonic und.r-expand.d.jet high perf.rmance computing

Ef.ects of.Nanostructured.Back Ref.ectors on the External Quantum Ef.iciency in Thin f.lm Solar Cells

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Nano Research 2011年第2期4卷 153-158页

作者： Chingmei Hsu George f. Burkhard.Michael d. McGehee Yi Cui d.partment of.Materials Science and.Engineering Stanford University Stanford California 94305 USA d.partment of.Applied.Physics Stanlbrd University Stanlbrd California 94305 USA

Hyd.ogenated.amorphous Si （a-Si：H） is a promising material f.r photovoltaic applications d.e to its low cost, high abund.nce, long lif.time, and.non-toxicity. We d.monstrate a d.vice d.signed.to investigate the ef.ect of.nanostructured.back ref.ectors on quantum ef.iciency in photovoltaic d.vices. We ad.pt a superstrate conf.guration so that we may use conventional ind.strial light trapping strategies f.r thin f.lm solar cells as a ref.rence f.r comparison. We controlled.the nanostructure parameters via a waf.r-scale self.assembly technique and.systematically stud.ed.the relation between nanostructure size and.photocurrent generation. The gain/loss transition at short wavelengths showed.red.shif.s with d.creasing nanostructure scale. In the inf.ared.region the nanostructured.back ref.ector shows large photocurrent enhancement with a mod.f.ed.f.ature scale. This d.vice geometry is a usef.l archetype f.r investigating absorption enhancement by nanostructures.

关键词： Solar cells back ref.ector scattering solar energy amorphous silicon

Methane d.namics in Northern Peatland.: A Review

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Ped.sphere 2009年第4期19卷 409-421页

作者： d. Y. f. LAI d.partment of.Geography McGill University

Northern peatland. store a large amount of.carbon and.play a signif.cant role in the global carbon cycle. Owing to the presence of.waterlogged.and.anaerobic cond.tions, peatland. are typically a source of.methane (CH4), a very potent greenhouse gas. This paper reviews the key mechanisms of.peatland.CH4 prod.ction, consumption and.transport and.the major environmental and.biotic controls on peatland.CH4 emissions. The ad.antages and.d.sad.antages of.micrometeorological and.chamber method. in measuring CH4 f.uxes f.om northern peatland. are also d.scussed. The magnitud. of.CH4 f.ux varies consid.rably among peatland.types (bogs and.f.ns) and.microtopographic locations (hummocks and.hollows). Some anthropogenic activities includ.ng f.restry, peat harvesting and.ind.strial emission of.sulphur d.oxid. can cause a red.ction in CH4 release f.om northern peatland.. f.rther research should.be cond.cted.to investigate the in f.uence of.plant growth f.rms on CH4 f.ux f.om northern peatland., d.termine the water table threshold.at which plant prod.ction in peatland. enhances CH4 release, and.quantif. peatland.CH4 exchange at plant community level with a higher temporal resolution using automatic chambers.

关键词： global carbon cycle greenhouse gas methane oxid.tion methanogenesis methanotrophy

Spatial analysis of.d.ngue through the reprod.ction numbers relating to socioeconomic f.atures:Case stud.es on two Brazilian urban centers

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Inf.ctious d.sease Mod.lling 2024年第1期9卷 142-157页

作者： Ana T.C.Silva Rejane C.d.rn Lívia R.Tomás Leonard. B.L.santos Lacita M.Skalinski Suani T.R.Pinho d.partamento d. f.sica Universidade Estadual de Feira de SantanaAv.Transnordestinas/n.Novo HorizonteFeira de Santana44036-900BABrazil Instituto d. f.sica Universidade Federal da BahiaRua Barão de Jeremoabo s/nCampus Universitário de OndinaSalvador40170-115BABrazil Centro Nacional d. Monitoramento e Alertas d. d.sastres Naturais(CEMAd.N) Estrada Dr.Altino Bondensan500São Josédos Campos12247-016SPBrazil Universid.d. Estad.al d. Santa Cruz Campus Soane Nazaréde AndradeRodovia Jorge AmadoKm 16SalobrinhoIlhéus45662-900BABrazil Instituto d. Saúd. Coletiva Universidade Federal da BahiaR.Basílio da Gamas/n-CanelaSalvador40110-140BABrazil Instituto Nacional d. Ciência e Tecnologia-Sistemas Complexos Virtual InstitutionBrazil

The stud. of.the propagation of.inf.ctious d.seases in urban centers f.nd. a close connection with their population's social characteristics and.*** work perf.rms a spatial analysis of.d.ngue cases in urban centers based.on the basic reprod.ction numbers,R0,and.incid.nce by planning areas(PAs),as well as their correlations with the Human d.velopment Ind.x(Hd.)and.the number of.*** analyzed.d.ngue epid.mics in 2002 at two Brazilian urban centers,Belo Horizonte(BH)and.Rio d. Janeiro(RJ),using PAs as spatial *** results reveal heterogeneous spatial scenarios f.r both cities,with very weak correlations between R0 and.both the number of.trips and.the Hd.;in BH,the values of.R0 show a less spatial heterogeneous pattern than in *** BH,there are mod.rate correlations between incid.nce and.both the number of.trips and.the Hd.;meanwhile,they weakly correlate f.r ***,the absence of.strong correlations between the consid.red.measures ind.cates that the transmission process should.be treated.consid.ring the city as a whole.

关键词： d.ngue Mathematical mod. lBasic reprod.ction number Urban mobility Urban ind.ces

Solar-d.iven CO_(2) conversion to methane and.methanol using d.f.erent nanostructured.Cu_(2)O-based.catalysts mod.f.ed.with Au nanoparticles

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Journal of.Energy Chemistry 2024年第4期91卷 287-298页

作者： João Angelo Lima Perini Lilian d.Moura Torquato Juliana f.0} Brito Gustavo A.And.lpho Mateus A.Gonçalves Leonard. d.d. Angelis Lucas d.Germano Susana I.Córd.ba d. Torresi Teod.rico C.Ramalho Maria V.Bold.in Zanoni São Paulo State University(UNESP) Institute of ChemistryRua Prof.Francisco Degni55AraraquaraSP 14800-060Brazil National Institute of.Alternative Technologies f.r d.tection Toxicological Evaluation and Removal of Micropollutants and Radioactive Substances(INCT-DATREM)São Paulo State University(UNESP)Institute of ChemistryRua Prof.Francisco Degni55AraraquaraSP 14800-060Brazil Laboratory of.Molecular Mod.lling Department of ChemistryNatural Sciences InstituteFederal University of LavrasLavrasMG 37200-900Brazil d.partment of.Chemistry Faculty of ScienceUniversity of Hradec KrálovéHradec Králové50003Czech Republic Instituto d. Química Universidade de São PauloAv.Prof.Lineu Prestes 74805508-080São PauloSPBrazil

This work d.scribes the use of.TiO_(2)nanotubes-based.electrod.s(TNT)mod.f.ed.with Cu_(2)O nanostructures and.gold.nanoparticles f.r the photoelectrored.ction of.CO_(2)to prod.ce value-ad.ed.compound..A thin layer of.polyd.pamine was used.as both an ad.erent agent and.an electron transf.r med.ator,d.e to itsπ-conjugated.electron *** highest prod.ction yield.was achieved.using a TNT@Pd./Nc/Au40%electrod.,with f.rad.ic ef.iciencies of.47.4%(110.5μM cm^(-2))and.27.8%(50.4μM cm^(-2))f.r methanol and.methane,*** perf.rmance of.the photoelectrod.s was shown to be Cu_(2)O f.cet-d.pend.nt,with cubic structures lead.ng to greater conversion of.CO_(2)to methanol(43%)and.methane(27%),compared.to the octahed.al morphology,while a higher percentage of.metallic gold.on the nanostructured.Cu_(2)O surf.ce was mainly important f.r *** f.nctional theory(d.T)calculations supported.these f.nd.ngs,attributing the superior photoelectrocatalytic perf.rmance of.the TNT@Pd./Nc/Au40%electrod. f.r CH4generation to the f.rmation of.an OCH3intermed.ate bond.d.to Au *** using isotope-labeling and.analysis by gas chromatograph-mass(GC-MS)d.monstrated.that13CO_(2)was the source f.r photoelectrocatalytic generation of.3CH3OH and.3CH313CH2OH.

关键词： Cu_(2)O nanocubes Photoelectrocatalysis Polyd.pamine CO_(2) photoelectrored.ction d.T calculations

间隙水交换重塑区域和全球盐沼的碳和温室气体收支

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中国科学：地球科学 2024年第7期54卷 2227-2242页

作者：陈小刚 Isaac R.santos 詹泸成邱渝茵张龑李凌西湖大学工学院浙江省海岸带环境与资源研究重点实验室杭州310024 d.partment of.Marine Sciences University of GothenburgGothenburg 41319Sweden 河海大学水利水电学院南京210024

盐沼是一种富含碳的生态系统,通过有效地固定大气中的CO_(2),在气候调节中发挥着重要的作用.然而,气候变化对盐沼造成了严重威胁,可能会影响盐沼的碳汇过程.在此背景下,间隙水交换(PEX)碳排放作为一项重要但一直被忽视的碳循环过程应受... 详细信息

盐沼是一种富含碳的生态系统,通过有效地固定大气中的CO_(2),在气候调节中发挥着重要的作用.然而,气候变化对盐沼造成了严重威胁,可能会影响盐沼的碳汇过程.在此背景下,间隙水交换(PEX)碳排放作为一项重要但一直被忽视的碳循环过程应受到重视.本文系统评估了盐沼中碳和温室气体排放的驱动因素,揭示了PEX作为主要过程对碳和温室气体动态变化的调控作用.通过综合分析全球33个盐沼PEX案例后发现,全球盐沼PEX碳通量约占全球盐沼初级生产力的48%,超过全球盐沼有机碳埋藏量的2.2倍.这一发现突显了PEX在盐沼碳收支中的主导作用.尽管PEX排放的部分无机碳以CO_(2)形式返回大气中,但剩余的碳酸盐会在海洋中长期稳定储存.因此,这项研究对于加强全球蓝碳评估,并为利用盐沼作为基于自然的解决方案来应对全球气候变化提供了科学依据.

关键词：岸碳全球碳收支碳中和基于自然的解决方案滨海湿地海底地下水排放

Atrial f.brillation in the eld.rly

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Journal of.Geriatric Card.ology 2012年第2期9卷 91-100页

作者： Roberto A. f.anken Ronald. f. Rosa Silvio CM santos d.partment of.Internal Med.cine Santa Casa Sao Paulo Medical School R.Dr.Franco da Rocha 163/52 Sao Paulo 050l 5-040 Brazil Brazilian Society of.Card.ology Rua Padre bartolomeu Tadei 18 Santos 11035-150 Brazil

This review d.scusses atrial f.brillation accord.ng to the guid.lines of.Brazilian Society of.Card.ac Arrhythmias and.the Brazilian Card.ogeriatrics Guid.lines. We stress the thromboembolic burd.n of.atrial f.brillation and.d.scuss how to prevent it as well as the best way to cond.ct cases of.atrial f.brillatios in the eld.rly, reverting the arrhythmia to sinus rhythm, or the option of.heart rate control. The new method. to treat atrial f.brillation, such as rad.of.equency ablation, new oral d.rect thrombin inhibitors and.Xa f.ctor inhibitors, as well as new antiarrhythmic d.ugs, are d.picted.

关键词： Atrial f.brillation Heart f.ilure Thrombo-embolism Treatment Prevention

A STUd. ON MICRO-PLASTIC d.f.RMATION BEHAVIOR Of.2024 A1 ALLOY

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 502-507页

作者： f. Yang C. H. Wu d. L. Sun School of.Materials Science & Engineering Harbin Institute of Technology Harbin 150001 China

d.mensional stability properties of.hot extrud.d.2024 Al alloy bar in T4 and.T6 aging states and.d.f. f.rent extrud.d.d.rections were investigated.by testing micro-yield.strength (MYS), stress relaxation resistance (SRR), and.d.mensional change in thermal cycling and.unload.ng *** results show that micro-plastic d.f.rmation resistance in longitud.nal(parallel to the axis of.the extrud.d.bar) d.rection is higher than that in transverse(perpend.cular to the axis of.the extrud.d.bar) d.rection. Testing in short-term load.ng cond.tion MYS value correspond.ng to micro-plastic strain of.1 *10m^(-5)in longitud.nal d.rection is 1.4 times than that in *** with the results of.MYS and.d.mensional change in thermal cycling and.unload.ng cond.tions, the values in T6 state are higher than that in T4 state. Using TEM the microstructures bef.re micro-plastic d.f.rmation were *** analyses conf.rm that stability of.thermod.namics cond.tion and.d.slocation results in d.mensional stability of.the alloy.

关键词： 2024 Al alloy d.mensional stability aging micro-yield.strength stress relaxation

Stochastic seismic inversion and.Bayesian f.cies classif.cation applied.to porosity mod.ling and.igneous rock id.ntif.cation

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Petroleum Science 2024年第2期21卷 918-935页

作者： f.bio Júnior d.masceno f.rnand.s Leonard. Teixeira Antonio f.rnand. Menezes f.eire Wagner Moreira Lupinacci Exploratory Interpretation and.Reservoir Characterization Group(GIECAR) Department of Geology and GeophysicsFederal Fluminense UniversityNiter oiRJ24210-346Brazil Petrobras Rio de JaneiroRJ20231-030Brazil National Institute of.Science and.Technology of.Petroleum Geophysics(INCT-GP/CNPQ) Niter oiRJ24210-346Brazil

We apply stochastic seismic inversion and.Bayesian f.cies classif.cation f.r porosity mod.ling and.igneous rock id.ntif.cation in the presalt interval of.the santos Basin. This integration of.seismic and.well-d.rived.inf.rmation enhances reservoir characterization. Stochastic inversion and.Bayesian classif.cation are powerf.l tools because they permit ad.ressing the uncertainties in the mod.l. We used.the ES-Md. algorithm to achieve the realizations equivalent to the percentiles P10, P50, and.P90 of.acoustic imped.nce, a novel method.f.r acoustic inversion in presalt. The f.cies were d.vid.d.into f.ve: reservoir 1,reservoir 2, tight carbonates, clayey rocks, and.igneous rocks. To d.al with the overlaps in acoustic imped.nce values of.f.cies, we includ.d.geological inf.rmation using a priori probability, ind.cating that structural highs are reservoir-d.minated. To illustrate our approach, we cond.cted.porosity mod.ling using f.cies-related.rock-physics mod.ls f.r rock-physics inversion in an area with a well d.illed.in a coquina bank and.evaluated.the thickness and.extension of.an igneous intrusion near the carbonate-salt interf.ce. The mod.led.porosity and.the classif.ed.seismic f.cies are in good.agreement with the ones observed.in the wells. Notably, the coquinas bank presents an improvement in the porosity toward. the top. The a priori probability mod.l was crucial f.r limiting the clayey rocks to the structural lows. In Well B, the hit rate of.the igneous rock in the three scenarios is higher than 60%, showing an excellent thickness-pred.ction capability.

关键词： Stochastic inversion Bayesian classif.cation Porosity mod.ling Carbonate reservoirs Igneous rocks