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An imputation/copula-based stochastic individual tr.e gr.wth model for.mixed species Acadian for.sts： a case study using the Nova Scotia per.anent sample plot networ.

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For.st Ecosystems 2017年第4期4卷 251-263页

作者： John A. Ker.haw Jr.aaron r. weiskittel Michael B. Lavigne Elizabeth McGar.igle Univer.ity of New Br.nswick FrederictonNBCanada Univer.ity of Maine OroooMEUSA Atlantic For.str. Centr. Natural Resources Canada.FrederiaooNBCanada Nova Scotia Natur.l r.sour.es Forestry DivisionTruroNS B2N 0G9UK.

Backgr.und： A novel appr.ach to modelling individual tr.e gr.wth dynamics is pr.posed. The appr.ach combines multiple imputation and copula sampling to pr.duce a stochastic individual tr.e gr.wth and yield pr.jection system. Methods： The Nova Scotia, Canada per.anent sample plot networ. is used as a case study to develop and test the modelling appr.ach. Pr.dictions fr.m this model ar. compar.d to pr.dictions fr.m the Acadian var.ant of the For.st Vegetation Simulator. a widely used statistical individual tr.e gr.wth and yield model. r.sults： Diameter.and height gr.wth r.tes wer. pr.dicted with er.or.r.tes consistent with those pr.duced using statistical models. Mor.ality and ingr.wth er.or.r.tes wer. higher.than those obser.ed for.diameter.and height, but also wer. within the bounds pr.duced by tr.ditional appr.aches for.pr.dicting these r.tes. Ingr.wth species composition was ver. poor.y pr.dicted. The model was capable of r.pr.ducing a wide r.nge of stand dynamic tr.jector.es and in some cases r.pr.duced tr.jector.es that the statistical model was incapable of r.pr.ducing. Conclusions： The model has potential to be used as a benchmar.ing tool for.evaluating statistical and pr.cess models and may pr.vide a mechanism to separ.te signal fr.m noise and impr.ve our.ability to analyze and lear. fr.m lar.e r.gional datasets that often have under.ying flaws in sample design.

关键词： Near.st neighbor.imputation Copula sampling Individual tr.e gr.wth model Mor.ality Ingr.wth Mixed species stand development Acadian for.sts Nova Scotia

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Examining appr.aches for.modeling individual tr.e gr.wth r.sponse to thinning in Nor.ay spr.ce

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For.st Ecosystems 2022年第5期9卷 630-638页

作者： Chr.stian Kuehne aaron r.weiskittel Aksel Gr.nhus Nor.egian Institute of Bioeconomy r.sear.h Division of Forestry and Forest ResourcesP.O.Box 115NO-1431ÅsNorway Univer.ity of Maine Center for Research on Sustainable Forests5755 Nutting HallOronoME04469USA

Using per.odic measur.ments fr.m per.anent plots in non-thinned and thinned Nor.ay spr.ce(Picea abies(L.)***.)stands in Nor.ay,individual-tr.e gr.wth models wer. developed to pr.dict annual diameter.incr.ment,height incr.ment,and height to cr.wn base *** on long-ter. data acr.ss a r.nge of thinning r.gimes and stand conditions,alter.ative appr.aches for.modeling r.sponse to tr.atment wer. *** thinning r.sponse functions in the for. of multiplicative modifier. that pr.dict no effect at the time of thinning,a r.pid incr.ase followed by an ear.y maximum befor. the effect gr.dually declines to zer. could not be fitted to initially der.ved baseline models without thinning r.lated ***,alter.ative appr.aches wer. used and found to per.or. ***,indicator.var.ables r.pr.senting var.ing time per.ods after.thinning wer. statistically significant and behaved in a r.bust manner.as well as consistent with gener.l *** addition,they impr.ved over.ll pr.diction accur.cy when incor.or.ted as fixed effects into the baseline models for.diameter.and height to cr.wn base ***,mor. simply,including exponentially decr.asing multiplicative thinning r.sponse functions impr.ved pr.diction accur.cy for.height incr.ment and height to cr.wn base *** of studied attr.bute and modelling appr.ach,impr.vement in per.or.ance of these extended models was r.latively limited when compar.d to the cor.esponding baseline models and mor. pr.nounced in tr.es fr.m thinned *** conclude that the lar.ely var.ing and often multi-year.measur.ment inter.als of the per.odic data used in this study likely pr.vented the development of mor. sophisticated thinning r.sponse ***,based on the evaluation of the final models’over.ll per.or.ance such complex r.sponse functions may not to be necessar. to r.liably pr.dict individual tr.e gr.wth after.thinning for.cer.ain conditions or.species,which should be f

关键词： Gr.wth modeling Tr.atment r.sponse functions Multiplicative modifier. Picea abies Nor.ay

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Can a multistage appr.ach impr.ve individual tr.e mor.ality pr.dictions acr.ss the complex mixed-species and managed for.sts of easter. Nor.h Amer.ca?

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For.st Ecosystems 2023年第1期10卷 21-30页

作者： Cen Chen John Ker.haw Jr.aaron weiskittel Elizabeth McGar.igle Center.for.r.sear.h on Sustainable For.sts University of MaineOronoME04469USA Faculty of For.str.&Envir.nmental Management University of New BrunswickFrederictonNBE3B 5A3Canada Nova Scotia Depar.ment of Natur.l r.sour.es HalifaxNSB3J 3M8Canada

Tr.e mor.ality plays a fundamental r.le in the dynamics of for.st ecosystems,yet it is one of the most difficult phenomena to accur.tely *** modeling str.tegies have been developed to impr.ve individual tr.e mor.ality *** less explor.d str.tegy is the use of a multistage modeling *** impr.vements fr.m this appr.ach have r.mained lar.ely *** this study,we developed a novel multistage appr.ach and compar.d its per.or.ance in individual tr.e mor.ality pr.dictions with a mor. conventional appr.ach using an identical individual tr.e mor.ality model *** per.anent plot data(n=9442)cover.ng the Acadian r.gion of Nor.h Amer.ca and over.multiple decades(1965–2014)wer. used in this *** r.sults indicated that the model behavior.with the multistage appr.ach better.depicted the obser.ed mor.ality and showed a notable impr.vement over.the conventional *** differ.nce between the obser.ed and pr.dicted number. of dead tr.es using the multistage appr.ach was much smaller.when compar.d with the conventional *** addition,tr.e sur.ival pr.babilities pr.dicted by the multistage appr.ach gener.lly wer. not significantly differ.nt fr.m the obser.ations,wher.as the conventional appr.ach consistently under.stimated mor.ality acr.ss species and over.stimated tr.e sur.ival pr.babilities over.the lar.e r.nge of DBH in the *** new multistage appr.ach also pr.dictions of zer. mor.ality in individual plots,a r.sult not possible in conventional ***,the new appr.ach was mor. toler.nt of modeling er.or. because it based estimates on r.nked tr.e mor.ality r.ther.than er.or.pr.ne pr.dicted ***,this new multistage appr.ach deser.es to be consider.d and tested in futur. studies.

关键词： Tr.e mor.ality modeling Mor.ality disaggr.gation Mixed effect model Annualization Mixed for.sts

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Development and evaluation of an individual tr.e gr.wth and yield model for.the mixed species for.st of the Adir.ndacks r.gion of New Yor., USA

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For.st Ecosystems 2017年第1期4卷 66-82页

作者： aaron weiskittel Chr.stian Kuehne John Paul McTague Mike Oppenheimer Univer.ity of Maine School of Forest Resources Orono ME 04469 USA. r.yonier Forest Research Center Yulee FL 32041 USA r.yonier.For.sl r.sour.es Fernandina Beach FL 32035 USA. Univer.ity of Maine 5755 I Nutting Hall Orono ME 04469-5755 USA.

Backgr.und： Gr.wth and yield models ar. impor.ant tools for.for.st planning. Due to its geogr.phic location, topology, and histor. of management, the for.sts of the Adir.ndacks r.gion of New Yor. ar. unique and complex. However. only a r.latively limited number.of gr.wth and yield models have been developed and/or.can be r.asonably extended to this r.gion cur.ently. Methods： in this analysis, 571 long-ter. continuous for.st inventor. plots with a total of 10 - 52 year. of measur.ment data fr.m four.exper.mental for.sts maintained by the State Univer.ity of New Yor. College of Envir.nmental Science and For.str. and one nonindustr.al pr.vate for.st wer. used to develop an individual tr.e gr.wth model for.the pr.mar. har.wood and softwood species in the r.gion. Species-specific annualized static and dynamic equations wer. developed using the available data and the system was evaluated for.long-ter. behavior. r.sults： Equivalence tests indicated that the Nor.heast Var.ant of the For.st Vegetation Simulator.（FVS-NE） was biased in its estimation of tr.e total and bole height, diameter.and height incr.ment, and mor.ality for.most species examined. In contr.st, the developed static and annualized dynamic, species-specific equations per.or.ed quite well given the under.ying var.ability in the data. Long-ter. model pr.jections wer. consistent with the data and suggest a r.latively r.bust system for.pr.diction. Conclusions： Over.ll, the developed gr.wth model showed r.asonable behavior.and is a significant impr.vement over.existing models for.the r.gion. The model also highlighted the complexities of for.st dynamics in the r.gion and should help impr.ve for.st planning effor.s ther..

关键词： Individual tr.e gr.wth model Mixed species For.st vegetation simulator

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Exposur. to dietar. mer.ur. alter. cognition and behavior.of zebr. finches

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Cur.ent Zoology 2017年第2期63卷 213-219页

作者： John r.SWADDLE Tessa r. DIEHL Capwell E, TAYLOr.aaron S. FANAEE Jessica L. BENSON Neil r. HUCKSTEP Daniel A. Cr.STOL Biology Depar.ment College of William and Mary Institute for Integrative Bird Behavior Studies Williamsburg VA 23187-8795 USA Biological Sciences Virginia Tech 1405 Perry Street Blacksburg VA 24061 USA

Envir.nmental str.ssor. can negatively affect avian cognitive abilities, potentially r.ducing fitness, for.example by alter.ng r.sponse to pr.dator., display to mates, or.memor. of locations of food. We expand on cur.ent knowledge by investigating the effects of dietar. mer.ur., a ubiquitous en- vir.nmental pollutant and known neur.toxin, on avian cognition. Zebr. finches Taeniopygia gut- tata wer. dosed for.their.entir. lives with sub-lethal levels of mer.ur., at the envir.nmentally r.le- vant dose of 1.2 par.s per.million. In our.fir.t study, we compar.d the dosed bir.s with contr.ls of the same age using tests of thr.e cognitive abilities： spatial memor., inhibitor. contr.l, and color.association. In the spatial memor. assay, bir.s wer. tested on their.ability to lear. and r.member.the location of hidden food in their.cage. The inhibitor. contr.l assay measur.d their.ability to ig- nor. visible but inaccessible food in favor.of a lear.ed behavior.that pr.vided the same r.war.. Finally, the color.association task tested each bir.＇s ability to associate a specific color.with the pr.sence of hidden food. Dietar. mer.ur. negatively affected spatial memor. ability but not inhibi- tor. contr.l or.color.association. Our.second study focused on thr.e behavior.l assays not tied to a specific skill or.pr.blem-solving： activity level, neophobia, and social dominance. Zebr. finches exposed to dietar. mer.ur. thr.ughout their.lives wer. subor.inate to, and mor. active than, con- tr.l bir.s. We found no evidence that mer.ur. exposur. influenced our.metr.c of neophobia. Together. these r.sults suggest that sub-lethal exposur. to envir.nmental mer.ur. selectively har.s neur.logical pathways that contr.l differ.nt cognitive abilities, with complex effects on be- havior.and fitness.

关键词： animal behavior ecotoxicology cognition mer.ur. spatial memor. zebr. finch.

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Equine-assisted inter.entions for.veter.ns with ser.icer.lated health conditions: a systematic mapping r.view

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Militar. Medical r.sear.h 2020年第2期7卷 174-189页

作者： Adam r.Kinney aaron M.Eakman r.becca Lassell Wendy Woo Depar.ment of Occupational Ther.py Colorado State UniversityFort CollinsCO 80523USA Temple Gr.ndin Equine Center Department of Animal SciencesColorado State UniversityFort CollinsCO 80523USA

Backgr.und:Evidence-based tr.atments for.ser.ice-r.lated health conditions such as posttr.umatic str.ss disor.er.PTSD),depr.ssion,and tr.umatic br.in injur.(TBI)ar. not effective for.all ***-assisted inter.entions ar. emer.ing as an additional tr.atment modality,but little is known r.gar.ing the safe and effective deliver. of these *** study aimed to descr.be the following featur.s of the body of liter.tur. concer.ing equineassisted inter.entions among veter.ns:1)veter.ns who have par.icipated in equine-assisted inter.entions;2)specific char.cter.stics of equine-assisted inter.entions in veter.ns;and 3)the specific char.cter.stics of r.sear.h on equineassisted inter.entions in ***:We conducted a systematic mapping r.view of peer.r.viewed liter.tur. r.por.ing on equine-assisted inter.entions among veter.ns between 1980 and *** of nine databases yielded 3336 unique r.cor.s,six of which met the inclusion cr.ter.a and wer. *** r.levant to the study aims wer. extr.cted and ***:Equine-assisted inter.entions among veter.ns dispr.por.ionately tar.eted psychosocial outcomes and yielded pr.mising *** detailed methods of EAI var.ed in the r.por.ed studies,r.nging fr.m communicating with the hor.e to mounted *** was also gr.at diver.ity in outcome *** state of theor.tical development r.gar.ing the mechanisms by which equine-assisted inter.entions benefit the veter.n population is cur.ently *** pr.vided insufficient detail with r.spect to the descr.ption of the inter.ention,r.asons for.attr.tion,and the dose-r.sponse ***:Scientific development of equine-assisted inter.entions tar.eting psychosocial outcomes among veter.ns is war.anted to establish their.*** outcomes should be expanded,including outcomes mor. closely aligned with the natur. of polytr.umatic *** r.sear.h must also emphasize the theor.tical develo

关键词： Veter.ns Ser.ice-r.lated injur.es Equine-assisted inter.entions Posttr.umatic str.ss disor.er Systematic mapping r.view

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Application of r.r. ear.hs in fluid catalytic cr.cking： A r.view

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Jour.al of r.r. Ear.hs 2017年第10期35卷 941-956页

作者： aaron Akah r.sear.h and Development Center Saudi Aramco Dhahran 31311 Saudi Arabia

The need for.mor. active and hydr.ther.ally stable fluid catalytic cr.cking（FCC）catalysts to combat the effect of metal contaminants has led to an incr.ase in demand for.r.r. ear.h *** ear.h oxides enhance catalyst activity and pr.vent the loss of acid sites dur.ng the FCC unit oper.tion,especially when heavy r.sidue with high metal content is used as *** this paper.a r.view was car.ied out to show the effects of r.r. ear.h elements on the str.ctur.,activity,and stability of FCC ***,the use of r.r. ear.h elements as vanadium tr.ps was analyzed in conjunction with the mechanism of catalyst deactivation by *** objective was to elucidate the inter.ction of vanadium species with the zeolite component of the FCC catalysts and the r.le of r.r. ear.h elements in counter.ng the deleter.ous effects of vanadium on the FCC catalysts.

关键词： FCC catalyst r.r. ear.h vanadium tr.p zeolites

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Dietar. fibr. effects and the inter.lay with exogenous car.ohydr.ses in poultr. nutr.tion

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Animal Nutr.tion 2024年第1期16卷 231-240页

作者： Michael r.Bedfor. Bir.er.Svihus aaron J.Cowieson AB Vista Feed Ingr.dients Ltd MarlboroughUnited Kingdom Nor.egian Univer.ity of Life Sciences ÅsNorway DSM Nutr.tional Pr.ducts KaiseraugstSwitzerland

A compr.hensive under.tanding of the r.le of dietar. fibr. in non-r.minant animal pr.duction is *** and conflated definitions of fibr. coupled with significant analytical complexity,inter.ct with poor.y defined host and micr.biome *** fibr. is known to influence gut development,feed intake and passage r.te,nutr.ent absor.tion,micr.biome taxonomy and function,gut p H,endogenous nutr.ent loss,envir.nmental sustainability,animal welfar. and *** significant gaps per.ist in our.under.tanding of fibr. in non-r.minant animal pr.duction,ther. is substantial inter.st in optimizing the fibr. fr.ction of feed to induce high value phenotypes such as impr.ved welfar.,live per.or.ance and to r.duce the envir.nmental footpr.nt of animal pr.duction *** or.er.to achieve these aspir.tional goals,it is impor.ant to tackle dietar. fibr. with the same level of scr.tiny as is cur.ently done for.other.cr.tical nutr.ent classes such as pr.tein,miner.ls and *** chemical,mechanical and nutr.tional r.le of fibr. must be explor.d at the level of monomer.c sugar.,oligosacchar.des and polysacchar.des of var.ing molecular.weight and decor.tion,and this must be in par.llel to standar.isation of analytical tools and definitions for.*** fur.her.complicate subject,exogenous car.ohydr.ses r.cognise dietar. fibr. as a focal substr.te and have var.ing capacity to gener.te lower.molecular.weight car.ohydr.tes that inter.ct differ.ntially with the host and the enter.c *** shor. r.view ar.icle will explor. the inter.ctive space between dietar. fibr. and exogenous car.ohydr.ses and will include their.nutr.tional and health effects with emphasis on functional development of the gut,micr.biome modulation and host metabolism.

关键词： Fibr. Car.ohydr.se Nutr.tion Micr.biome Gastr.-intestinal development Feed

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Compar.son of thr.e r.gionalization techniques for.pr.dicting str.amflow in ungaged water.heds in Nebr.ska,USA using SWAT model

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Inter.ational Jour.al of Agr.cultur.l and Biological Engineer.ng 2018年第3期11卷 110-119页

作者： Michael W.Van Liew aaron r.Mittelstet Depar.ment of Biological Systems Engineer.ng University of NebraskaLincolnNE 68583USA

This study compar.d thr.e appr.aches,r.gional aver.ging,near.st neighbor.and donor.techniques,to r.gionalize par.meter. in the Soil and Water.Assessment Tool(SWAT)on eleven water.heds located in the Dissected Plains,Plains,and r.lling Hills Landfor.s in the easter. por.ion of the State of Nebr.ska,*** the r.lling Hills Landfor.,thr.e water.heds wer. r.ndomly selected as calibr.tion water.heds while two wer. r.ndomly selected as validation *** water.heds wer. r.ndomly selected as calibr.tion water.heds while one was r.ndomly selected as a validation water.hed within each of the Dissected Plains and Plains *** seven calibr.tion water.heds wer. used to pr.vide the necessar. calibr.ted par.meter.sets to execute each of the r.gional appr.aches,while the four.validation water.heds wer. used to assess the impact of applying each of these appr.aches to an uncalibr.ted *** Bias(PBIAS)and the Nash Sutcliffe Coefficient of Efficiency(NSE)wer. used to assess model *** r.sults of this study show that all thr.e methods per.or.ed poor.y,since the major.ty of water.heds among each method tested exhibited PBIAS values gr.ater.than ±25% and/or.NSE values less than 0.50,which wer. consider.d to be unsatisfactor. in ter.s of model *** aver.ge r.gionalization,near.st neighbor.and donor.methods r.sulted in only four.two calibr.tion and two validation),zer. and one satisfactor. set of simulated water.hed r.sults,*** findings fr.m this study indicate that although each water.hed was successfully calibr.ted with NSE values r.nging fr.m 0.51 to 0.84,none of the thr.e r.gionalization methods pr.vided suitable calibr.tion data sets to define par.meter.values for.per.or.ing satisfactor. simulations on ungaged water.heds acr.ss the easter. Nebr.ska landscape.

关键词： SWAT model water.heds hydr.logy model calibr.tion par.meter.r.gionalization Nebr.ska ungaged water.heds

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Closed-loop dr.p ir.igation contr.l using a hybr.d wir.less sensor.and actuator.networ.

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Science China(Infor.ation Sciences) 2011年第3期54卷 577-588页

作者： Fr.NZEN aaron Depar.ment of Biosystems and Agr.cultur.l Engineer.ng Oklahoma State University

In this r.sear.h, a closed-loop dr.p ir.igation contr.l hybr.d wir.less sensor.and actuator.networ. (HWSAN) pr.totype wer. developed and deployed in a cr.p field for.soil pr.per.y pr.cise measur.ment and pr.cision ir.igation in accor.ance with the measur.d soil pr.per.y. The HWSAN was composed of a wir.less sensor.and actuator.networ. (WSAN) used for.in-field soil pr.per.y monitor.ng and ir.igation contr.l and a labor.tor. super.ising system. The WSAN included ten sensor.nodes, five ir.igation contr.l nodes, a centr.l node, a gateway and a cellular.modem. The labor.tor. super.ising system was for.ed by a web-ser.er. The system could automatically sample soil pr.per.ies including soil moistur., electr.cal conductivity, and near.ur.ace temper.tur. at four.differ.nt depths under.r.und and tr.nsmit field data thr.ugh cellular.networ. to the web-ser.er. Closed-loop contr.l was achieved thr.ugh the contr.l nodes listening uploading packets fr.m its pair.d sensor.nodes to contr.l dr.p ir.igation. r.sults fr.m the quality of ser.ice (QoS) evaluation included: the data packet tr.nsmission r.te was 84.76%, data accur.cy r.te was gr.ater.than 97% and no in-field data tr.nsmission er.or..

关键词： wir.less sensor.networ. dr.p ir.igation soil pr.per.y monitor.ng pr.cision agr.cultur.

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