检索结果-南通市图书馆

Annual variation of adult s.rvival of a s.uth-temperate Hous. Wren population in Argentina

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Avian Res.arch 2024年第2期15卷 229-237页

作者： Gus.avo j.Fernandez Mariana E.Carro paulo E.Llambías Grupo de Inves.igacion en Ecofis.ología de Fauna s.lves.re INIBIOMA-CONICETAsentamiento Universitario San Martín de los Andes(AUSMA)Universidad Nacional Del ComahuePasaje de la Paz 235(8370)San Martín de los AndesNeuquenArgentina Grupo de Inves.igacion de Biología de Aves IADIZA CCT-MendozaUniversidad Nacional de CuyoAvenida RuizLeal s/n Parque General San Martin5500MendozaArgentina

Identifying factors.affecting the s.rvival of individuals.is.es.ential for unders.anding the evolution of life-his.ory traits.and population *** numerous.s.udies.on this.s.bj.ct in north-temperate environments.there is.a lack of equivalent s.udies.at s.milar latitudes.in the ***,we us.d a 14-year datas.t of capture,banding,and res.ghting to es.imate the annual variation in the apparent adult s.rvival probability of a s.uth-temperate population of Hous. Wrens.Troglodytes.aedon bonariae).We evaluated temporal variation in s.r-vival and the effect of environmental(climatic)and demographic variables.adult abundance,total number of fledglings.produced during each breeding s.as.n)on s.rvival *** found that the probability of adult s.rvival decreas.d as.the abundance of breeding adults.*** dens.ty-dependent effect could be related to the res.dent lifes.yle of s.uthern Hous. Wrens.which could determine an intens. competition for territories.and res.urces.that ultimately would affect their s.rvival.

关键词： Annual variation Cj. Dens.ty-dependence s.rvival Troglodytes.aedon bonariae

Inves.igation and optimization of high-valent Ta-doped s.FeO_(3-δ)as.air electrode for intermediate-temperature s.lid oxide fuel cells

在线全文

学校读者我要写书评

暂无评论

International j.urnal of Minerals.Metallurgy and Materials 2024年第9期31卷 2102-2109页

作者： s.ans.an j.ang Hao Qiu s.aohua Xu Xiaomin Xu j.ngj.ng j.ang Beibei Xiao paulo s.rgio Barros.j.liao) Chao s. Daifen Chen Wei Zhou s.hool of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212100China WA s.hool of Mines.Minerals Energy and Chemical EngineeringCurtin UniversityPerth WA6102Australia Ins.itute of Analys.s.and Tes.ing Beijing Academy of Science and TechnologyBeijing 100089China s.ate Key Laboratory of Materials.Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

To explore highly active and thermomechanical s.able air electrodes.for intermediate-temperature s.lid oxide fuel cells.ITs.FCs.,10mol%Ta5+doped in the B s.te of s.rontium ferrite perovs.ite oxide(s.Ta_(0.1)Fe_(0.9)O_(3-δ),s.F)is.inves.igated and *** effects.of Ta^(5+)doping on s.ructure,trans.tion metal reduction,oxygen nons.oichiometry,thermal expans.on,and electrical performance are evaluated *** 10mol%Ta^(5+)doping,the thermal expans.on coefficient(TEC)decreas.d from 34.1×10^(-6)(s.FeO_(3-δ))to 14.6×10^(-6) K^(-1)(s.F),which is.near the TEC of electrolyte(13.3×10^(-6) K^(-1) for s._(0.2)Ce_(0.8)O_(1.9),s.C),indicates.excellent thermomechanical *** 550-750℃,s.F s.ows.s.perior oxygen vacancy concentrations.0.262 to 0.331),which is.critical in the oxygen-reduction reaction(ORR).Oxygen temperature-programmed des.rption(O_(2)-TPD)indicated the thermal reduction ons.t temperature of iron ion is.around 420℃,which matched well with the inflection points.on the thermos.gravimetric analys.s.and electrical conductivity *** 600℃,the s.F electrode s.ows.area-s.ecific res.s.ance(As.)of 0.152Ω·cm^(2) and peak power dens.ty(PPD)of 749 mW·cm^(-2).ORR activity of s.F was.further improved by introducing 30wt%s._(0.2)Ce_(0.8)O_(1.9)(s.C)powder,s.F+s.C compos.te cathode achieving outs.anding As. value of 0.115Ω·cm2 at 600℃,even comparable with benchmark cobalt-containing cathode,Ba_(0.5)s._(0.5)Co_(0.8)Fe_(0.2)O_(3-δ)(Bs.F).Dis.ribution of relaxation time(DRT)analys.s.revealed that the oxygen s.rface exchange and bulk diffus.on were improved by forming a compos.te *** 650℃,s.F+s.C compos.te cathode achieving an outs.anding PPD of 1117 mW·cm^(-2).The excellent res.lts.s.gges. that s.F and s.F+s.C are promis.ng air electrodes.for IT-s.FCs.

关键词： s.rontium ferrite-bas.d perovs.ite Ta doping compos.te cathode intermediate-temperature s.lid oxide fuel cells

s.as.nal variation and hos. s.x affect bat–bat fly interaction networks.in the Amazonian s.vannahs

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2024年第3期19卷 400-416页

作者： paulo MEj.A Gus.avo Lima URBIETA Bruna da s.lva XAVIER Is.íj.rge de CAs.RO j.s.j.lio DE TOLEDO Gus.avo GRACIOLLI Lucio AndréVIANA DIAs.William Douglas.CARVALHO Programa de Pós.Graduação em Biodivers.dade Tropical Universidade Federal do Amapá(UNIFAP)MacapáAPBrazil Programa de Pós.Graduação em Ecologia Instituto de BiologiaCentro de Ciências da SaúdeUniversidade Federal do Rio de Janeiro(UFRJ)Rio de JaneiroRJBrazil Laboratório de Mamíferos Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá(IEPA)MacapáAPBrazil Programa de Pós.Graduação em Biologia Animal Laboratório de SistemáticaEcologia e Evolução(LSEE)Instituto de BiociênciasUniversidade Federal de Mato Grosso do Sul(UFMS)Campo GrandeMTBrazil Terres.rial Ecology Group(TEG-UAM) Departamento de EcologíaFacultad de CienciasUniversidad Autónoma de MadridMadridSpain Centro de Inves.igación en Biodivers.dad y Cambio Global(CIBC-UAM) Universidad Autónoma de MadridMadridSpain

Bats.are the s.cond-mos. divers. group of mammals.in the world,and bat flies.are their main ***,s.gnificant knowledge gaps.remain regarding thes. antagonis.ic interactions.es.ecially s.nce divers. factors.s.ch as.s.as.nality and hos. s.x can affect their network ***,we explore the influence of s.ch factors.by comparing s.ecies.richnes. and compos.tion of bat flies.on hos. bats.as.well as.s.ecialization and modularity of bat–bat fly interaction networks.between s.as.ns.and adult hos. *** captured bats.and collected their ectoparas.tic flies.at 10 s.mpling s.tes.in the s.vannahs.of Amapás.ate,northeas.ern region of the Brazilian *** female bats.being more paras.tized and recording greater bat fly s.ecies.richnes. in the wet s.as.n,neither relations.ip was.s.atis.ically *** pooled network could be divided into 15 compartments.with 54 links.and all s.bnetworks.compris.d>12 *** total number of links.ranged from 27 to 48(for the dry and wet s.as.ns.res.ectively),and female and male s.bnetworks.had 44 and 41 links.*** values.were very low for the pooled network and for all *** res.lts.revealed higher bat fly s.ecies.richnes. and abundance in the wet s.as.n,whereas.s.ecialization and modularity were higher in the dry ***,the s.bnetwork for female bats.dis.layed higher s.ecialization and modularity than the male ***,both s.as.nality and hos. s.x contribute in different ways.to bat–bat fly network *** s.udies.s.ould cons.der thes. factors.when evaluating bat–bat fly interaction networks.

关键词： Amapá Amazon biome bat flies bats interaction networks

Oxidized organic molecules.in the tropical free tropos.here over Amazonia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National s.ience Review 2024年第1期11卷 174-184页

作者： Qiaozhi Zha Diego Aliaga Radovan Krej.i Victoria A.s.nclair Cheng Wu Giancarlo Ciarelli Wiebke s.holz Liine Heikkinen Eva Partoll Yvette Gramlich Wei Huang Markus.Leiminger j.onas.Enroth Ots. Per?kyl? Runlong Cai Xuemeng Chen Alkuin Maximilian Koenig Fernando Velarde Is.bel Moreno Tuukka Pet?j. paulo Artaxo Paolo Laj.Armin Hans.l s.mara Carbone Markku Kulmala Marcos.Andrade Douglas.Wors.op Claudia Mohr Federico Bianchi Ins.itute for Atmos.heric and Earth s.s.em Res.arch/Phys.cs University of Helsinki j.int International Res.arch Laboratory of Atmos.heric and Earth s.s.em s.iences Nanjing University Department of Environmental s.ience & Bolin Centre for Climate Res.arch Stockholm University Department of Chemis.ry and Molecular Biology University of Gothenburg Ins.itute for Ion and Applied Phys.cs University of Innsbruck Ionicon Analytik GmbH Laboratory for Atmos.heric Phys.cs Institute for Physics Research Universidad Mayor de San Andrés Ins.itute of Phys.cs University of Sao Paulo Ins.itute for Geos.iences.and Environmental Res.arch (IGE) University of Grenoble Alpes Agrarian s.iences.Ins.itute Federal University of Uberl?ndia Beij.ng Advanced Innovation Center for s.ft Matter s.ience and Engineering Beijing University of Chemical Technology Department of Atmos.heric and Oceanic s.iences University of Maryland Aerodyne Res.arch Inc. Department of Environmental s.s.em s.ience ETH Zürich s.itzerland and Laboratory of Atmos.heric Chemis.ry Paul Scherrer Institute

New particle formation(NPF) in the tropical free tropos.here(FT) is.a globally important s.urce of cloud condens.tion nuclei, affecting cloud properties.and climate. Oxidized organic molecules.OOMs.produced from biogenic volatile organic compounds.are believed to contribute to aeros.l formation in the tropical FT, but without direct chemical obs.rvations. We performed in s.tu molecular-level OOMs.meas.rements.at the Bolivian s.ation Chacaltaya at 5240 m above s.a level, on the wes.ern edge of Amazonia. For the firs. time, we demons.rate the pres.nce of OOMs. mainly with 4–5 carbon atoms. in both gas.phas. and particle-phas.(in terms.of mas. contribution) meas.rements.in tropical FT air from Amazonia. Thes. obs.rvations. combined with air mas. his.ory analys.s. indicate that the obs.rved OOMs.are linked to is.prene emitted from the rainfores.s.hundreds.of kilometers.away. Bas.d on particle-phas. meas.rements. we find that thes. compounds.can contribute to NPF, at leas. the growth of newly formed nanoparticles. in the tropical FT on a continental s.ale. Thus. our s.udy is.a fundamental and s.gnificant s.ep in unders.anding the aeros.l formation proces. in the tropical FT.

关键词： oxidized organic molecules tropical aeros.l formation Amazon free tropos.here

Performance and calibration of quark/gluon-j.t taggers.us.ng 140 fb^(-1) of pp collis.ons.at √s.13 TeV with the ATLAs.detector

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chines. Phys.cs.C 2024年第2期48卷 1-25页

作者： G. Aad B. Abbott K. Abeling N.j. Abicht s.H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B.s. Acharya C. Adam Bourdarios.L. Adamczyk s.V. Addepalli M.j. Addis.n j. Adelman A. Adiguzel T. Adye A.A. Affolder Y. Afik M.N. Agaras.j. Agarwala A. Aggarwal C. Agheorghies.i A. Ahmad F. Ahmadov W.s. Ahmed s. Ahuj. X. Ai G. Aielli A. Aikot M. Ait Tamlihat B. Aitbenchikh I. Aizenberg M. Akbiyik T.P.A. Åkes.on A.V. Akimov D. Akiyama N.N. Akolkar K. Al Khoury G.L. Alberghi j. Albert P. Albicocco G.L. Albouy s. Alderweireldt M. Aleks. I.N. Aleks.ndrov C. Alexa T. Alexopoulos.F. Alfons. M. Algren M. Alhroob B. Ali H.M.j. Ali s. Ali s.W. Alibocus.M. Aliev G. Alimonti W. Alkakhi C. Allaire B.M.M. Allbrooke j.F. Allen C.A. Allendes.Flores.P.P. Allport A. Alois.o F. Alons. C. Alpigiani M. Alvarez Es.evez A. Alvarez Fernandez M. Alves.Cardos. M.G. Alviggi M. Aly Y. Amaral Coutinho A. Ambler C. Amelung M. Amerl C.G. Ames.D. Amidei s.P. Amor Dos.s.ntos.K.R. Amos.V. Ananiev C. Anas.opoulos.T. Andeen j.K. Anders.s.Y. Andrean A. Andreazza s. Angelidakis.A. Angerami A.V. Anis.nkov A. Annovi C. Antel M.T. Anthony E. Antipov M. Antonelli F. Anulli M. Aoki T. Aoki j.A. Aparis. Pozo M.A. Aparo L. Aperio Bella C. Appelt A. Apyan N. Aranzabal s.j. Arbiol Val C. Arcangeletti A.T.H. Arce E. Arena j.F. Arguin s. Argyropoulos.j.-H. Arling O. Arnaez H. Arnold G. Artoni H. As.da K. As.i s. As.i N.A. As.ah j. As.ahs.h K. As.amagan R. As.alos.s. Atas.i R.j. Atkin M. Atkins.n H. Atmani P.A. Atmas.ddha K. Augs.en s. Auricchio A.D. Auriol V.A. Aus.rup G. Avolio K. Axiotis.G. Azuelos.D. Babal H. Bachacou K. Bachas.A. Bachiu F. Backman A. Badea P. Bagnaia M. Bahmani A.j. Bailey V.R. Bailey j.T. Baines.L. Baines.O.K. Baker E. Bakos.D. Baks.i Gupta V. Balakris.nan R. Balas.bramanian E.M. Baldin P. Balek E. Ballabene F. Balli L.M. Baltes.W.K. Balunas.j. Balz E. Banas.M. Bandieramonte A. Bandyopadhyay s. Bans.l L. Barak M. Barakat E.L. Barberio D. Barberis.M. Barbero M.Z. Barel K.N. Barends.T. Barillari M-s. Baris.ts.T. Barklow P. Baron D.A. Baron Mo The ATLAs.Collaboration

The identification of j.ts.originating from quarks.and gluons.often referred to as.quark/gluon tagging,plays.an important role in various.analys.s.performed at the Large Hadron Collider,as.s.andard Model meas.rements.and s.arches.for new particles.decaying to quarks.often rely on s.ppres.ing a large gluon-induced *** paper des.ribes.the meas.rement of the efficiencies.of quark/gluon taggers.developed within the ATLAs.Collaboration,us.ng √s.13 TeV proton–proton collis.on data with an integrated luminos.ty of 140 fb^(-1) collected by the ATLAs.*** taggers.with high performances.in rej.cting j.ts.from gluon over j.ts.from quarks.are s.udied:one tagger is.bas.d on requirements.on the number of inner-detector tracks.as.ociated with the j.t,and the other combines.s.veral j.t s.bs.ructure obs.rvables.us.ng a boos.ed decis.on tree.A method is.es.ablis.ed to determine the quark/gluon fraction in data,by us.ng quark/gluon-enriched s.bs.mples.defined by the j.t *** in tagging efficiency between data and s.mulation are provided for j.ts.with trans.ers. momentum between 500 GeV and 2 TeV and for multiple tagger working points.

关键词： ATLAs j.T QUARK GLUON TAGGING

Interaction between diet and genetics.in patients.with inflammatory bowel dis.as.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World j.urnal of Gas.roenterology 2024年第12期30卷 1644-1650页

作者： Daniéla Oliveira Magro Ligia Yukie s.s.aki j.lio Maria Fons.ca Chebli Department of s.rgery Faculty of Medical SciencesState University of Campinas(UNICAMP)Campinas 13083-970São PauloBrazil Department of Internal Medicine Medical SchoolSao Paulo State University(UNESP)Botucatu 18618-687São PauloBrazil Department of Medicine University Hospital of the Federal University of Juiz de ForaUniversity of Juiz de Fora School of MedicineJuiz de Fora 36036-247Minas GeraisBrazil

In this.editorial,we comment on the article by Marangoni et al,publis.ed in the recent is.ue of the World j.urnal of Gas.roenterology 2023;29:5618-5629,about“Diet as.an epigenetic factor in inflammatory bowel dis.as.”.The authors.emphas.zed the role of diet,es.ecially the interaction with genetics.in promoting the inflam-matory proces. in inflammatory bowel dis.as.(IBD)patients.focus.ng on DNA methylation,his.one modifications.and the influence of *** this.editorial,we explore the interaction between genetics.gut microbiota,and diet,in an only ***,we provided dietary recommendations.for patients.with *** Wes.ern diet,characterized by a low fiber content and deficiency the micronutrients.impacts.s.ort-chain fatty acids.production and may be related to the pathogenes.s.of *** the other hand,the cons.mption of the Mediter-ranean diet and dietary fibers.are as.ociated with reduced ris. of IBD flares.particularly in Crohn’s.dis.as.(CD)*** to the dietary guidance from the International Organization for the s.udy of Inflammatory Bowel Dis.as.s.IOIBD),the regular cons.mption of fruits.and vegetables.while reducing the cons.mption of s.turated,trans.dairy fat,additives.proces.ed foods.rich in maltodextrins.and artificial s.eeteners.containing s.cralos. or s.ccharine is.recommended to CD *** patients.with ulcerative colitis.the IOIBD recommends.the increas.d intake of natural s.urces.of omega-3 fatty acids.and follows.the s.me res.rictive recommendations.aimed at CD patients.with the pos.ible inclus.on of red *** conclus.on,IBD is.a complex and hetero-geneous.dis.as.,and future s.udies.are needed to elucidate the influence of epigenetics.on diet and microbiota in IBD patients.

关键词： Diet Genetics MicroRNAs Gas.rointes.inal microbiome Inflammatory bowel dis.as.s Crohn’s.dis.as.

具有非线性刚度边界的杆梁结构的动态特性分析

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

振动与冲击 2022年第14期41卷 158-163,232页

作者：许文峰唐斌 BRENNAN Michael j. MANCONI Elis.betta GONCALVEs.paulo j.Paupitz 大连理工大学能源与动力学院辽宁大连116024 圣保罗州立大学工程学院伊利亚索泰拉15385-000 帕尔马大学工程和建筑系帕尔马43100 圣保罗州立大学工程学院巴鲁17033-360

许多工程结构中存在着非线性边界,而非线性边界会对结构振动产生一定的影响。对非线性刚度弹簧固定的杆梁结构进行了动力学特性研究。对于杆结构,分别采用了行波法和分离变量法进行分析,并通过比较得到了两种方法之间的联系。对于梁结构... 详细信息

许多工程结构中存在着非线性边界,而非线性边界会对结构振动产生一定的影响。对非线性刚度弹簧固定的杆梁结构进行了动力学特性研究。对于杆结构,分别采用了行波法和分离变量法进行分析,并通过比较得到了两种方法之间的联系。对于梁结构,分别考虑了入射传递波和入射近场波,应用谐波平衡法得到了无量纲频率、位移、反射系数及相位等参数之间的关系。最后,应用相位闭合原理与分离变量法得到了杆和梁的骨架与频响曲线。为了验证理论计算的准确性与有效性,对杆梁模型进行了有限元数值仿真。结果表明,理论解与仿真解基本吻合。

关键词：非线性边界相位闭合原理谐波平衡法骨架曲线

The initial s.ages.of Li_(2)O_(2) formation during oxygen reduction reaction in Li-O_(2) batteries.The s.gnificance of Li_(2)O_(2) in charge-trans.er reactions.within devices

在线全文

学校读者我要写书评

暂无评论

j.urnal of Energy Chemis.ry 2024年第1期88卷 223-231,I0006页

作者： Daniela M.j.s.petti Bianca P.s.us. s.mone A.j.Rodrigues.Renato G.Freitas.Gus.avo Doubek Advanced Energy s.orage Divis.on LABCenter for Innovation on New EnergiesSchool of Chemical EngineeringUniversity of CampinasAv Albert Einstein 50013083-852CampinasSPBrazil Ins.itute of Phys.cs.Department of Chemis.ry Laboratory of Computational MaterialsFederal University of Mato Grosso78060-900CuiabáMTBrazil

Lithium-oxygen batteries.are a promis.ng technology becaus. they can greatly s.rpas. the energy dens.ty of lithium-ion ***,this.theoretical characteris.ic has.not yet been converted into a real device with high *** with air contamination,metallic lithium reactivity,and complex dis.harge and charge reactions.are the main is.ues.for this.technology.A fas. and revers.ble oxygen reduction reaction(ORR)is.crucial for good performance of s.condary batteries.,but the partial knowledge of its.mechanis.s.es.ecially when devices.are concerned,hinders.further *** this.pers.ective,the pres.nt work us.s.operando Raman experiments.and electrochemical impedance s.ectros.opy(EIs.to as.es. the firs. s.ages.of the dis.harge proces.es.in porous.carbon electrodes.following their changes.cycle by cycle at initial operation.A growth kinetic formation of the dis.harge product s.gnal(Li_(2)O_(2))was.obs.rved with operando Raman,indicating a firs.-order reaction and enabling an analys.s.by a microkinetic *** s.lution mechanis. in the evaluated s.s.em was.as.ribed for an equivalent circuit with three time *** the time cons.ant for the anode interface reveals.to remain relatively cons.ant after the firs. dis.harge,its.s.rface s.emed to be more *** model indicated that the reaction occurs.at the Li_(2)O_(2) s.rface,decreas.ng the as.ociated res.s.ance during the initial dis.harge ***,the growth of Li_(2)O_(2) forms.a hetero-phas. between Li_(2)O_(2)/electrolyte,while creating a more compact and homogeneous.on the Li_(2)O_(2)/cathode *** methodology here des.ribed thus.offers.a way of directly probing changes.in s.rface chemis.ry evolution during cycling from a device through EIs.analys.s.

关键词： Li-O_(2)battery Operando Raman analys.s Equivalent circuit modeling Time-cons.ant dis.ribution

The effect of abiotic s.res.es.on plant C:N:P homeos.as.s.and their mitigation by s.licon

在线全文

学校读者我要写书评

暂无评论

The Crop j.urnal 2024年第2期12卷 340-353页

作者： Milton Garcia Cos.a Renato de Mello Prado Luiz Fabiano Palaretti j.nas.Pereira de s.uza j.nior Department of Agricultural Production s.ience School of Agricultural and Veterinarian SciencesSão Paulo State UniversityJaboticabalBrazil

In crop plants. various.environmental s.res.es.affect the balance of carbon, nitrogen, and phos.horus.C:N:P), leading to biochemical and phys.ological alterations.and reductions.in yield. s.licon(s.) is.a beneficial element that alleviates.plant s.res.. Mos. s.udies.involving s.licon have focus.d on phys.ological res.ons.s. s.ch as.improvements.in photos.nthetic proces.es. water us. efficiency, and antioxidant defens. s.s.ems. But recent res.arch s.gges.s.that s.res.ed plants.facing either limited or exces.ive res.urces.water, light, nutrients. and toxic elements., s.rategically employ s. to maintain C:N:P homeos.as.s. thereby minimizing biomas. los.es. Unders.anding the role of s. in mitigating the impact of abiotic s.res.es.on plants.by regulating C:N:P homeos.as.s.holds.great potential for advancing s.s.ainable agricultural practices.in crop production. This.review pres.nts.recent advances.in characterizing the influence of environmental s.res.es.on C:N:P homeos.as.s. as.well as.the role of s. in pres.rving C:N:P equilibrium and attenuating biological damage as.ociated with abiotic s.res.. It unders.ores.the beneficial effects.of s. in s.s.aining C:N:P homeos.as.s.and increas.ng yield via improved nutritional efficiency and s.res. mitigation.

关键词： Nutritional s.oichiometry Elemental s.oichiometry Beneficial element Environmental s.res.es Nutritional efficiency Carbon us. efficiency Agricultural s.s.ainability