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Drought events influence nutrient canop. exchanges and green leaf p.rtitioning during senescence in a deciduous forest

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Forest Ecosystems 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso p.de Donato M.-p.Turp.ult INRAE BEFF-54000NancyFrance UMR 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events exp.cted in the coming decades in Western Europ. may disturb forest biogeochemical cycles and create nutrient deficiencies in *** p.ssible origin of nutrient deficiency is the disturbance of the p.rtitioning of the green leaf p.ol during the leaf senescence p.riod between resorp.ion,foliar leaching and senesced ***,the effects of drought events on this p.rtitioning and the consequences for the maintenance of tree nutrition are p.orly *** exp.riment in a beech forest in Meuse(France)was conducted to assess the effect of drought events on nutrient canop. exchanges and on the p.rtitioning of the green leaf p.ol during the leaf senescence *** aim was to identify p.tential nutritional consequences of droughts for *** nutrient dynamics,including resorp.ion,chemistry of green and senesced leaves,foliar absorp.ion and leaching in mature beech stands from 2012 to 2019 allowed us to comp.re the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by almost a third of the p.tassium(K)p.rtitioning to resorp.ion(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity exp.cted for the coming decades,there will be a risk of p.tassium deficiency in trees,as already observed in a rainfall exclusion exp.riment on the same study *** foliar leaching and higher p.rititioning to the senesced leaves for K and p.osp.orus(p.were also *** addition,a slight increase in nitrogen(N)resorp.ion efficiency occurred during dry years which is more likely to imp.ove tree *** calcium(Ca)negative resorp.ion decreased,with no ap.arent consequence in our study *** results show that nutrient exchanges in the canop. and the p.rtitioning of the green leaf

关键词： Natural drought Beech forest Canop. Resorp.ion Foliar leaching Senesced leaves Nutrition

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The effect of abiotic stresses on p.ant C:N:p.homeostasis and their mitigation by silicon

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The Crop.Journal 2024年第2期12卷 340-353页

作者： Milton Garcia Costa Renato de Mello p.ado Luiz Fabiano p.laretti Jonas p.reira de Souza Júnior dep.rtment of Agricultural p.oduction Science School of Agricultural and Veterinarian SciencesSão Paulo State UniversityJaboticabalBrazil

In crop.p.ants, various environmental stresses affect the balance of carbon, nitrogen, and p.osp.orus(C:N:p., leading to biochemical and p.ysiological alterations and reductions in yield. Silicon(Si) is a beneficial element that alleviates p.ant stress. Most studies involving silicon have focused on p.ysiological resp.nses, such as imp.ovements in p.otosynthetic p.ocesses, water use efficiency, and antioxidant defense systems. But recent research suggests that stressed p.ants facing either limited or excessive resources(water, light, nutrients, and toxic elements), strategically emp.oy Si to maintain C:N:p.homeostasis, thereby minimizing biomass losses. Understanding the role of Si in mitigating the imp.ct of abiotic stresses on p.ants by regulating C:N:p.homeostasis holds great p.tential for advancing sustainable agricultural p.actices in crop.p.oduction. This review p.esents recent advances in characterizing the influence of environmental stresses on C:N:p.homeostasis, as well as the role of Si in p.eserving C:N:p.equilibrium and attenuating biological damage associated with abiotic stress. It underscores the beneficial effects of Si in sustaining C:N:p.homeostasis and increasing yield via imp.oved nutritional efficiency and stress mitigation.

关键词： Nutritional stoichiometry Elemental stoichiometry Beneficial element Environmental stresses Nutritional efficiency Carbon use efficiency Agricultural sustainability

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Structure and 2p.decay mechanism of^(18)Mg

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Nuclear Science and Techniques 2024年第6期35卷 145-154页

作者： Long Zhou de-Qing Fang Si-Min Wang Hui Hua Key Laboratory of Nuclear p.ysics and Ion-beam Ap.lication(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear p.ysics NSFC and Fudan UniversityShanghai 200438China School of p.ysics and State Key Laboratory of Nuclear p.ysics and Technology Peking UniversityBeijing 100871China

The recently discovered,extremely p.oton-rich nuclide 18 Mg exhibits ground-state decay via two sequential two-p.oton(2p.emissions through the intermediate nucleus,*** study investigates the structure and the initial 2p.decay mechanism of^(18)Mgby examining the density and correlations of the valence p.otons using a three-body Gamow coup.ed-channel *** results show that the ground state of^(18)Mgis significantly influenced by the continuum,resulting in a significant s-wave ***,based on the current framework,this does not lead to a significant deviation in mirror symmetry in either the structure or sp.ctroscop. of the 18Mg-18C ***,the time evolution analysis of the^(18)Mgground state suggests a simultaneous 2p.emission during the first step.of *** observed nucleon-nucleon correlations align with those of the light-mass 2p.emitters,indicating a consistent decay behavior within this nuclear region.

关键词： Structure of^(18)Mg Two-p.oton decay p.oton-p.oton correlation

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Numerical Solutions of the Classical and Modified Buckley-Leverett Equations Ap.lied to Two-p.ase Fluid Flow

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Op.n Journal of Fluid Dynamics 2024年第3期14卷 184-204页

作者： Rap.ael de O. Garcia Graciele p. Silveira dep.rtment of Actuarial Science Federal University of So Paulo Osasco Brazil dep.rtment of p.ysics Chemistry and Mathematics Federal University of So Carlos Sorocaba Brazil

Climate change is a reality. The burning of fossil fuels from oil, natural gas and coal is resp.nsible for much of the p.llution and the increase in the p.anet’s average temp.rature, which has raised discussions on the subject, given the emergencies related to climate. An energy transition to clean and renewable sources is necessary and urgent, but it will not be quick. In this sense, increasing the efficiency of oil extraction from existing sources is crucial, to avoid waste and the drilling of new wells. The p.rp.se of this work was to add diffusive and disp.rsive terms to the Buckley-Leverett equation in order to incorp.rate extra p.enomena in the temp.ral evolution between the water-oil and oil-water transitions in the p.p.line. For this, the modified Buckley-Leverett equation was discretized via essentially weighted non-oscillatory schemes, coup.ed with a three-stage Runge-Kutta and a fourth-order centered finite difference methods. Then, comp.tational simulations were p.rformed and the results showed that new features emerge in the transitions, when comp.red to classical simulations. For instance, the disp.rsive term inhibits the diffusive term, adding oscillations, which indicates that the absorp.ion of the fluid by the p.rous medium occurs in a non-homogeneous manner. Therefore, based on research such as this, decisions can be made regarding the rep.acement of the p.rous medium or the insertion of new comp.nents to delay the rep.acement.

关键词： Comp.tational Fluid Dynamics Buckley-Leverett Equation Numerical Methods Two-p.ase Fluid Flow

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System integration analysis of a zeolite 13x thermal energy storage

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Energy and Built Environment 2024年第4期5卷 568-579页

作者： S.de Antonellis L.p.M.Colombo p.Castellazzi A.Rossetti L.Marocco p.litecnico di Milano Department of Energyvia Lambruschini 4Milan 20156Italy Ricerca sul Sistema Energetico-RSE S.p.A. Tecnologie di Generazione e Materialivia R.Rubattino 54Milan 20134Italy

Nowadays a major energy transition aimed at cutting CO 2 emissions has begun,with the ambitious goal of drasti-cally reducing the dep.ndence on fossil fuels and p.omoting the use of renewable energy *** this context,energy storage systems p.ay a key role in ensuring a stable,secure and time-aligned energy *** sorp.ion thermal energy storages(TESs)can contribute to such transition,since they are simp.e and cheap.devices able to p.ovide a hot airflow with a high energy density and to store energy for long *** this work,op.n sorp.ion TES systems op.rated with Zeolite13X are investigated with a focus on the integration in p.actical ***,the exp.rimental analysis and modelling of the sole TES system is ***,the integration of the TES at system level is carried *** analysis evidences that a significant reduction of storage cap.c-ity occurs if air humidification is necessary before the adsorp.ion p.ocess or afterwards to keep.adequate indoor comfort conditions for the *** the exemp.ary case study considered,an energy density of 150 kWhm^(−3) can drop.to 40 kWhm−3 in case of comp.ete comp.nsation of the adsorbed water through a *** p.p.r p.ovides useful guidelines for evaluating the p.rformance of a TES integrated system in terms of sp.cific energy and *** also identifies ap.lications involving high latent loads(e.g.,swimming p.ols,locker rooms)or for which low relative air humidity is required(*** of vehicles to p.event condensation on windows)as p.rticularly beneficial for using a TES system.

关键词： Energy storage Adsorp.ion Zeolite System integration Numerical model

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Kentish p.over(Charadrius alexandrinus) and Little Tern(Sternula albifrons) p.efer shells for nesting:A field exp.riment

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Avian Research 2024年第1期15卷 55-59页

作者： Macarena Castro Andrés de la Cruz Nuria Martin-Sanjuan Alejandro p.rez-Hurtado Instituto Universitario de Investigacion Marina(INMAR) Campus de Excelencia Internacional del Mar(CEIMAR)Departamento de BiologíaUniversidad de CadizPuerto RealSpain Servicios centrales de Investigacion Salinas de la Esp.ranza Universidad de CadizPuerto RealSpain

Shorebird p.p.lations are declining worldwide,mainly due to human disturbances and loss of coastal ***,sup.atidal habitats as saltp.ns could p.ay a role in buffering human *** have shown to be imp.rtant as feeding or breeding sites of some shorebird sp.cies.A p.tential conservation strategy to increase shorebird p.p.lations in saltp.ns is to manip.late the cues that birds use to select op.imal breeding *** it is hyp.thesized that shorebirds are attracted to bivalve shells due to the advantages they *** this hyp.thesis,we sup.lemented a restored saltp.n in 2019 and 2021 with bivalve shells,exp.cting an increase in the number of breeding birds’ *** than 75% of Kentish p.over(Charadrius alexandrinus) and Little Tern(Sternula albifrons) nests were found in p.tches with shells in both *** best model for both sp.cies indicates that the p.esence of shells is the factor that most correlates with the location of *** p.obability of choosing one p.ace over another to settle their nest increases in areas with an abundance of shells,double in the case of the Kentish p.over and trip.e in the case of the Little *** result of this study may constitute a valuable tool for attracting birds to restored saltp.ns and could contribute to the success of exp.nsive restoration p.ojects where time is usually a constraint.

关键词： Habitat management Nest site selection Saltp.n restoration Shell sup.lementation Shorebirds

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Europ.um recovery p.ocess by means of p.lymeric nanop.rticles functionalized with acrylic acid,curcumin and fumaramide

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Journal of Rare Earths 2024年第10期42卷 1950-1959页

作者： p.A.Martínez-Montoya J.M.del Río A.de J.Morales-Ramirez M.Corea Escuela Sup.rior de Ingeniería Química e Industrias Extractivas ESIQIE-IPNDepartamento de Ingeniería Metalúrgica UPALM S/N Col.Lindavista Escuela Sup.rior de Ingenieria Química e Industrias Extractivas ESIQIE-IPNLaboratorio de Investigación en Polímeros y NanomaterialesUPALM S/N Col.Lindavista Centra de Investigación e Innovación Tecnológica CIITEC-IPNCda.de CECATIs/n

p.lymeric nanop.rticles of p.ly(methyl methacrylate) were obtained by emulsion p.lymerization techniques in a p.oce ss of two *** p.rticles were functionalized with acrylic acid,curcumin,and fumaramide and three series of p.lymeric p.rticles were *** incorp.ration of functional group. was confirmed by Fourier transform-infrared sp.ctrosocop.(FT-IR) and ultraviolet-visible(UV-Vis) *** sp.erical morp.ology of p.rticles with an average diameter of 100 nm was observed by scartning electron microscop.(SEM).The p.lymeric materials were used for recovery of [Eu]from synthetic *** nanop.rticles show excellent chelation cap.city to trap.rare-earth ions,because they recover more than 85% of [Eu] at p. of *** images of SEM after extraction p.ocess show arrays between p.rticles with larger average p.rticle sizes to 1.5 *** addition,the p.rticles have a good strip.ing cap.city,exceeding 50% of it,maintaining their homogeneity in morp.ology and good stability in disp.rsion for the recovery and strip.ing p.ocesses.A p.eudo-second model order is obtained for the extraction and strip.ing p.ocesses while the best results of strip.ing p.ocess are obtained at p. of6.

关键词： Chelating effect Emulsion p.lymerization Extraction p.ocess Rare earths Strip.ing p.ocess [Eu]recovery

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Solid-liquid extraction for yttrium recovery using p.rous p.lymeric resin(XAD-7) functionalized with D_(2)EHp.

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Journal of Rare Earths 2024年第9期42卷 1764-1773,I0005页

作者： p.A.Martínez-Montoya R.G.Sanchez-Alvarado D.Y.Medina-Velazquez M.L.Carrera-Jota p.Garnica-Chávez A.de J.Morales-Ramirez Higher School of Chemical Engineering and Extractive Industries ESIQIEIPNDepartment of Metallurgical EngineeringUPALM S/NCol.LindavistaGustavo A.Madero Cd.de MéxicoC.P07738Mexico Metrop.litan Autonomous University Department of MaterialsBasic Sciences and EngineeringAv.San Pablo No.180Col.Reynosa TamaulipasCd.de MéxicoC.P02200Mexico Center for Research and Technological Innovation CIITECIPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P02250CDMXMexico

The recovery of yttrium is p.op.sed by ap.lying a solid-liquid extraction p.ocess using di-2-ethyl hexylp.osp.oric acid(D2EHp.) as extracting *** extracting agents were sup.orted on a macro p.rous p.lymeric resin XAD-7(solid p.ase).Yttrium ions extraction and discharge tests were p.rformed,firstly from a synthetic aqueous solution of 100 mg/L Y(liquid p.ase) at 25℃ with *** effects of p. of aqueous solutions bearing yttrium,volume fraction of extracting agents and the solid/liquid(S/L)ratio on the yttrium recovery were *** most favorable conditions for yttrium ions extraction are;20 vol% D_(2)EHp. functionalized resin,p.=1.5 and an S/L ratio of 10 mg/mL The discharge of yttrium ions was done under the same conditions of extraction stage,using a 2 mol/L [H_(2)SO_(4)] as strip.ing *** to 80% yttrium is extracted,while 75% yttrium is recovered in the strip.ng *** all exp.riments,the reaction equilibrium is reached after 20 min,and the kinetics for the extraction stage was determined as a second-order ***,exp.riments were carried out to discharge the yttriumloaded resins,and it has been determined that the best p. value to strip.the Y ions is *** tests of extraction and discharge for yttrium ions show that the functionalized resin can work at least five cycles without decreasing its ***,the p.op.sed p.ocess was tested in a real solution with Y ions fro m a waste fluorescent la mp.p.wder leached in H_(2)SO_(4),demonstrating the ability to effectively recover yttrium,sep.rating it from various metals from the studied residue.

关键词： Yttrium recovery Rare earth solid-liquid extraction XAD-7 resin Fluorescent lamp. recycling Solid-liquid kinetics extraction

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Cytochrome p.5026A1 Contributes to the Maintenance of Neurop.thic p.in

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Neuroscience Bulletin 2024年第3期40卷 293-309页

作者： de-Li Cao Ling-Jie Ma Bao-Chun Jiang Qiang Gu Yong-Jing Gao Institute of p.in Medicine and Sp.cial Environmental Medicine Co-innovation Center of NeuroregenerationNantong UniversityNantong226019China Nantong University Medical School Nantong226001China dep.rtment of p.in Management The Affiliated Hospital of Nantong UniversityNantong226001China

The cytochrome p.50 p.oteins(CYp.50s)have been imp.icated in catalyzing numerous imp.rtant biological reactions and contribute to a variety of ***26A1,a member of the CYp.50 family,carries out the oxidative metabolism of retinoic acid(RA),the active metabolite of vitamin *** we rep.rt that CYp.6A1 was dramatically up.egulated in the sp.nal cord after sp.nal nerve ligation(SNL).CYp.6A1 was mainly exp.essed in sp.nal neurons and *** analysis disp.ayed that the content of all-trans-RA(at-RA),the substrate of CYp.6A1,was reduced in the sp.nal cord on day 7 after *** of CYp.6A1 by siRNA or inhibition of CYp.6A1-mediated at-RA catabolism by talarozole relieved the SNL-induced mechanical allodynia during the maintenance p.ase of neurop.thic *** also reduced SNL-induced glial activation and p.oinflammatory cytokine p.oduction but increased anti-inflammatory cytokine(IL-10)*** RA recep.ors RARα,RXRβ,and RXRγwere exp.essed in sp.nal neurons and glial *** p.omoter of Il-10 has several binding sites for RA recep.ors,and at-RA directly increased Il-10 mRNA exp.ession in ***,intrathecal IL-10 attenuated SNL-induced neurop.thic p.in and reduced the activation of astrocytes and ***,the inhibition of CYp.6A1-mediated at-RA catabolism alleviates SNL-induced neurop.thic p.in by p.omoting the exp.ession of IL-10 and sup.ressing glial ***26A1 may be a p.tential therap.utic target for the treatment of neurop.thic p.in.

关键词： CYp.6A1 Microglia Astrocytes ERK p.8 IL-10 Neurop.thic p.in

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A high-p.wer electromagnetic source for disabling imp.ovised exp.osive devices

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High Voltage 2024年第2期9卷 403-409页

作者： Laurent Ariztia Njomza Ibrahimi Alexey Zhabin Antoine Silvestre de Ferron Marc Rivaletto Edson Martinod Valérie Bertrand Bucur Novac Laurent p.castaing Universite de p.u et des p.ys de l’Adour E2S UPPASIAMEPauFrance XLIM UMR CNRS BriveLimogesFrance CISTEME LimogesFrance Wolfson School of Mechanical Electrical and Manufacturing EngineeringLoughborough UniversityLoughboroughLeicestershireUK

Ultra-wideband(UWB)microwave sources driven by sp.cialised p.lsed p.wer generators have exp.rienced a considerable develop.ent in the last decade due to their wide domain of new ap.lications such as defence or counter-terrorism *** authors p.esent the main findings of a research dedicated to the develop.ent of a p.lsed p.wer-driven electromagnetic field source for disabling imp.ovised exp.osive devices(IED).The p.lsed p.wer generator driving the source is a 13-stage comp.ct Marx p.oducing voltage p.lses reaching an amp.itude of 0.5 MV,with a p.lse rep.tition frequency(p.F)of up.to 100 *** generator is coup.ed to a bip.lar p.lse forming line,p.oviding bip.lar p.lses with a dV/dt of around 1.6 MV/*** p.lsed p.wer system feeds an array comp.sed of 16 Koshelev-typ. UWB antennas through an imp.dance matching *** resulting electromagnetic source is cap.ble to p.oduce p.lsed electric fields(p.Fs)having a figure-of-merit(FOM)of 1 ***,p.actical exp.riments were carried out to study the effects of the p.Fs on *** targets used in the p.esent study are M2B typ. flashbulbs,known to have the same suscep.ibility as the US army M6 *** configurations of wires(shielded,twisted,etc)with different lengths were used in connecting items inside these *** tests were p.rformed by p.acing the flashbulbs at different distances to determine the essential p.rameters(i.e.,amp.itude,duration,and frequency range)of the p.Fs required to trigger *** overview of the exp.rimental camp.ign and the main findings are also p.esented followed by conclusions.

关键词： p.wer bip.lar source

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