检索结果-南通市图书馆

Integr.tive Zoology 2018年第6期13卷 761-768页

作者： Yue CHEN r.ber. lewis J.Thomas CUr.IS Depar.ment of Phar.acology and Physiology Oklahoma State University Center for Health SciencesTulsaOklahomaUK

Mer.ur. chlor.de exposur. thr.ugh dr.nking water.in adult male pr.ir.e voles(Micr.tus ochr.gaster.has been shown to alter.their.social ***,we examined the potential disr.ption of adult social behavior.in pr.ir.e voles that wer. exposed to 60 ppm mer.ur. dur.ng ear.y *** used a cr.ss-foster.ng appr.ach to test the effects of mer.ur. exposur.:(1)fr.m conception until bir.h;(ii)fr.m bir.h until weaning;and(iii)fr.m conception until weaning,on adult affiliative *** and mer.ur.-tr.ated voles wer. given the option of r.maining in an empty cage or.affiliating with a same-sex conspecific in a 3-h choice *** found that ear.y developmental mer.ur. exposur. had little if any effect on the r.pr.ductive success of br.eder.pair. or.on affiliative behavior.by either.sex when subjects wer. tested as *** r.sults suggest that,at least in the context of the behavior.tested,the effects of ear.y developmental exposur. to mer.ur. do not per.anently alter.adult pr.ir.e vole affiliative behavior.or.do so in a way that is too subtle to be detected using the cur.ent testing par.digm.

关键词： behavior.l testing metals toxicity social behavior pr.ir.e vole

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

“瓣”随心动

环球科学 2024年第7期 16-17页

作者：塔尼娅·刘易斯安君(译) 不详

患有先天性心脏瓣膜缺损的孩子通常需要接受移植手术,以置换来自捐献者的瓣膜。由于经过冻融的瓣膜组织已经死亡,无法继续生长,接受移植的孩子不得不定期接受手术,置换更大的瓣膜,这增加了预后不良的风险。但是一项新的手术方法或许能... 详细信息

患有先天性心脏瓣膜缺损的孩子通常需要接受移植手术,以置换来自捐献者的瓣膜。由于经过冻融的瓣膜组织已经死亡,无法继续生长,接受移植的孩子不得不定期接受手术,置换更大的瓣膜,这增加了预后不良的风险。但是一项新的手术方法或许能让移植的瓣膜随儿童的成长发育一起生长——同时移植部分心脏、具有生理活性的瓣膜及部分血管。

关键词：捐献者预后不良移植手术先天性心脏生理活性瓣膜置换

Exper.mental Investigation of the r.il Pr.ssur. Fluctuations Cor.elated with Fuel Pr.per.ies and Injection Settings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Automotive Innovation 2021年第2期4卷 215-226页

作者： Car.o Cor.tella lewis Par.y Yanfei Li Hongming Xu School of Mechanical Engineer.ng University of BirminghamEdgbastonBirmingham B152TTUK State Key Labor.tor. of Automotive Safety and Ener.y Tsinghua UniversityBeijingChina

Injection-induced r.il pr.ssur. fluctuations ar. pr.ven to cause nonunifor. spr.y *** fluctuations ar. also r.sponsible for.gener.ting lower.injection pr.ssur.s,to the detr.ment of jet penetr.tion length and br.ak-up *** the vast liter.tur. dealing with such issues,sever.l aspects of r.il pr.ssur. fluctuations r.main ***,the need for.compliance with the emission legislation has shed light on the potential of alter.ative fuels,which r.pr.sent a pathway for.sustainable *** scenar.o has motivated the pr.sent study dealing with the assessment of the time histor. of r.il pr.ssur. cor.elated with fuel *** have been per.or.ed using a last-gener.tion common r.il injection equipment under.var.ous injection settings,employing diesel and 2-methylfur.n-diesel *** paper.descr.bes the r.sear.h activity and aims to pr.vide new insights into the cor.elation of r.il pr.ssur. fluctuations with fuel pr.per.ies.

关键词： r.il pr.ssur. fluctuations Wave pr.pagation Viscosity Bulk modulus 2-Methylfur.n Fuel blend

r.sponses of Tr.e Species to Climate War.ing at Differ.nt Spatial Scales

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Geogr.phical Science 2011年第4期21卷 427-436页

作者： LIANG Yu HE Hong S lewis Ber.ar. L State Key Labor.tor. of For.st and Soil Ecology Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China School of Natur.l r.sour.es University of Missouri-Columbia203m Anheuser-Busch Natural Resources BuildingColumbiaMissouri 65211-7270USA Gr.duate Univer.ity of Chinese Academy of Sciences Beijing 100049China

Tr.e species r.spond to climate change at multiple scales,such as species physiological r.sponse at fine scale and species distr.bution (quantified by per.ent ar.a) at br.ader.spatial *** a given spatial scale,species physiological r.sponse and distr.bution can be cor.elated positively or.*** consistency of such cor.elation r.lationships at differ.nt spatial scales deter.ines whether.species r.sponses der.ved fr.m local scales can be extr.po-lated to br.ader.spatial *** this study,we used a coupled modeling appr.ach that coupled a plot-level ecosystem pr.cess model (LINKAGES) with a spatially explicit landscape model (LANDIS).We investigated species physio-logical r.sponses and distr.bution r.sponses to climate war.ing at the local,zonal and landscape scales r.spectively,and examined how species physiological r.sponse and distr.bution cor.elated at each cor.esponding scale and whether.the cor.elations wer. consistent among these *** r.sults indicate that for.zonal and war.ing-sensitive species,the cor.elations between species physiological r.sponse and distr.bution ar. consistent at these spatial scales,and ther.for. the r.sear.h r.sults of vegetation r.sponse to climate war.ing at the local scale can be extr.polated to the zonal and landscape *** contr.st,for.zonal and war.ing-insensitive species the cor.elations among differ.nt spatial scales ar. consistent at some spatial scales but at other.*** r.sults also suggest that the r.sults of azonal species at the local scale near.their.distr.bution boundar.es can not be extr.polated simply to br.ader.scales due to str.nger.r.sponses to climate war.ing in those boundar. r.gions.

关键词： climate war.ing vegetation r.sponse local scale zonal scale landscape scale LANDIS Changbai Mountains

Metabolic checkpoints in neur.degener.tive T helper.17（TH17） and neur.r.gener.tive r.gulator. T(Tr.g) cells as new ther.peutic tar.ets for.multiple scler.sis

在线全文

学校读者我要写书评

暂无评论

Neur.l r.gener.tion r.sear.h 2020年第2期15卷 267-269页

作者： Hongxing Shen James A. Bonner.lewis Zhichang Shi Depar.ment of r.diation Oncology The University of Alabama at BirminghamBirminghamALUSA O'Neal Compr.hensive Cancer.Center The University of Alabama at BirminghamBirminghamALUSA Depar.ment of Micr.biology The University of Alabama at BirminghamBirminghamALUSAProgram in ImmunologyThe University of Alabama at BirminghamBirminghamALUSA

The centr.l ner.ous system (CNS) is an immune-pr.vileged site with tightly-r.gulated immune r.sponses, a concept pr.posed by Nobel Laur.ate Sir.Peter.Medawar.in 1960. Under.physiological conditions, only a few T lymph... 详细信息

关键词： Metabolic checkpoints multiple scler.sis CNS

Stochastic DoS Attack Allocation Against Collabor.tive Estimation in Sensor.Networ.s

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Jour.al of Automatica Sinica 2020年第5期7卷 1225-1234页

作者： Ya Zhang Lishuang Du Fr.nk L.lewis School of Automation Southeast Universityand also with the Key Laboratory of Measurement and Control of Complex Systems of EngineeringMinistry of EducationNanjing 210096China Univer.ity of Texas at Ar.ington r.sear.h Institute Fort WorthTX 76118 USA IEEE

In this paper.denial of ser.ice(DoS)attack management for.destr.ying the collabor.tive estimation in sensor.networ.s and minimizing attack ener.y fr.m the attacker.per.pective is *** the communication channels between sensor. and a r.mote estimator.the attacker.chooses some channels to r.ndomly jam DoS attacks to make their.packets r.ndomly dr.pped.A stochastic power.allocation appr.ach composed of thr.e steps is ***,the minimum number.of channels and the channel set to be attacked ar. ***,a necessar. condition and a sufficient condition on the packet loss pr.babilities of the channels in the attack set ar. pr.vided for.gener.l and special systems,***,by conver.ing the or.ginal coupling nonlinear.pr.gr.mming pr.blem to a linear.pr.gr.mming pr.blem,a method of sear.hing attack pr.babilities and power.to minimize the attack ener.y is *** effectiveness of the pr.posed scheme is ver.fied by simulation examples.

关键词： Attack allocation denial of ser.ice(DoS)attack packet loss r.mote estimation sensor.networ.s

In-ser.ice per.or.ance of emer.ency shutdown valves and dependent oper.tional r.lationships in the offshor. oil and gas industr.

在线全文

学校读者我要写书评

暂无评论

Petr.leum 2023年第4期9卷 613-620页

作者： Keith Camer.n Andr.w lewis Diogo Montalvao Mohammad r.za Her.atmanesh School of Physics Engineering and Computer ScienceUniversity of HertfordshireUnited Kingdom Depar.ment of Design and Engineer.ng Faculty of Science and TechnologyBournemouth UniversityUnited Kingdom

Industr.al pr.cess plants use emer.ency shutdown valves(ESDVs)as safety bar.ier. to pr.tect against hazar.ous events,br.nging the plant to a safe state when potential danger.is *** ESDVs ar. used extensively in offshor. oil and gas pr.cessing plants and have been mandated in the design of such systems fr.m national and inter.ational standar.s and *** paper.has used actual ESDV oper.ting data fr.m four.mid/late life oil and gas pr.duction platfor.s in the Nor.h Sea to r.sear.h oper.tional r.lationships that ar. of inter.st to those r.sponsible for.the technical management and oper.tion of *** fir.t of the two r.lationships is between the closur. time(CT)of the ESDV and the time it r.mains in the open position,pr.or.to the close *** has been hypothesised that the CT of the ESDV is affected by the length of time that it has been open pr.or.to being closed(Time since the last str.ke).In addition to the gener.l analysis of the data ser.es,two sub-categor.es wer. cr.ated to fur.her.investigate this possible r.lationship for.CT and these ar.“above mean”and“below mean”.The cor.elations(Pear.on's based)r.sulting fr.m this analysis ar. in the“weak”and“ver. weak”*** second r.lationship investigated was the effect of ver. fr.quent closur.s to assess if this impr.ves the *** oper.tional r.cor.s for.six subjects wer. analysed to find closur.s that occur.ed within a 24 h per.od of each ***,no discr.minating tr.nd was appar.nt wher. CT was impacted positively or.negatively by the fr.quent closur. *** was concluded that the var.ance of ESDV closur. time cannot be influenced by the technical management of the ESDV in ter.s of scheduling the oper.tion of the ESDV.

关键词： Emer.ency Shutdown Valve Safety instr.mented systems Closur. time IEC-61511

Neur.l networ. solution for.finite-hor.zon H-infinity constr.ined optimal contr.l of nonlinear.systems

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2007年第1期5卷 1-11页

作者： Fr.nk L.lewis Automation and r.botics r.sear.h Institute University of TexasArlington TX 76118USA

In this paper. neur.l networ.s ar. used to appr.ximately solve the finite-hor.zon constr.ined input H-infinity state feedback contr.l pr.blem. The method is based on solving a r.lated Hamilton-Jacobi-Isaacs equation of the cor.esponding finite-hor.zon zer.-sum game. The game value function is appr.ximated by a neur.l networ. with time- var.ing weights. It is shown that the neur.l networ. appr.ximation conver.es unifor.ly to the game-value function and the r.sulting almost optimal constr.ined feedback contr.ller.pr.vides closed-loop stability and bounded L2 gain. The r.sult is an almost optimal H-infinity feedback contr.ller.with time-var.ing coefficients that is solved a pr.or. off-line. The effectiveness of the method is shown on the r.tational/Tr.nslational Actuator.benchmar. nonlinear.contr.l pr.blem.

关键词： Constr.ined input system Hamilton-Jacobi-Isaacs H-infinity contr.l Finite-hor.zon zer.-sum games Neur.l networ. contr.l

Mitigating and Monitor.ng Smar. City Using Inter.et of Things

在线全文

学校读者我要写书评

暂无评论

Computer., Mater.als & Continua 2020年第11期65卷 1059-1079页

作者： Sudan Jha lewis Nkenyer.ye Gyanendr. Pr.sad Joshi Eunmok Yang School of Computer.Science and Engineer.ng Lovely Professional UniversityPunjab144411India Depar.ment of Computer.and Infor.ation Secur.ty Sejong UniversitySeoul05006Korea Depar.ment of Computer.Science and Engineer.ng Sejong UniversitySeoul05006Korea Depar.ment of Computer.Engineer.ng Kongju National UniversityGongju32588Korea

The pr.sent tr.nds in smar. wor.d r.flects the extensive use of limited r.sour.es thr.ugh infor.ation and communication *** limited r.sour.es like space,mobility,ener.y,etc.,have been consumed r.gor.usly towar.s cr.ating optimized but smar. ***,a new concept of IoT integr.ted smar. city vision is yet to be pr.posed which includes a combination of systems like noise and air.loss monitor.ng,web monitor.ng and fir. detection systems,smar. waste bin systems,etc.,that have not been clear.y addr.ssed in the pr.vious *** paper.focuses on developing an effective system for.possible monitor.ng of losses,tr.ffic management,thus innovating smar. city at lar.e with digitalized and integr.ted systems and softwar. for.fast and effective *** our.pr.posed system,a r.al time data analysis is *** data ar. collected by var.ous sensor. to analyze differ.nt factor. that ar. r.sponsible for.such *** pr.posed wor. is validated on a r.al case study.

关键词： Inter.et of Things smar. city envir.nmental impair.ents pollution temper.tur.

Backstepping appr.ach for.design of PID contr.ller.with guar.nteed per.or.ance for.micr.-air.UAV

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Contr.l Theor. and Technology 2020年第1期18卷 19-33页

作者： Yusuf KAr.AL Patr.k KOLAr.C Victor.LOPEZ Atilla DOGAN Fr.nk lewis Univer.ity of Texas at Ar.ington r.sear.h Institute Forth Worth 76118TXU.S.A. ZDepar.ment of Mechanical and Aer.space Engineer.ng University of Texas at ArlingtonTKU.S.A.

Flight contr.ller. for.micr.-air.UAVs ar. gener.lly designed using pr.por.ional-integr.l-der.vative(PID)methods,wher. the tuning of gains is difficult and time-consuming,and per.or.ance is not *** this paper.we develop a r.gor.us method based on the sliding mode analysis and nonlinear.backstepping to design a PID contr.ller.with guar.nteed *** technique pr.vides the str.ctur. and gains for.the PID contr.ller.such that a r.bust and fast r.sponse of the UAV(unmanned aer.al vehicle)for.tr.jector. tr.cking is ***,the second-or.er.sliding var.able er.or. ar. used in a r.gor.us nonlinear.backstepping design to obtain guar.nteed per.or.ance for.the nonlinear.UAV ***,using a small angle appr.ximation and r.gor.us geometr.c manipulations,this nonlinear.design is conver.ed into a PID contr.ller.whose str.ctur. is natur.lly deter.ined thr.ugh the backstepping *** gains that guar.ntee r.bust UAV per.or.ance ar. finally computed fr.m the sliding mode gains and fr.m stabilizing gains for.tr.cking er.or.*** pr.ve that the desir.d Euler.angles of the inner.attitude contr.ller.loop ar. r.lated to the dynamics of the outer.backstepping tr.cker.loop by inver.e kinematics,which pr.vides a seamless connection with existing built-in UAV attitude *** implement the pr.posed method on actual UAV,and exper.mental flight tests pr.ve the validity of these *** is seen that our.PID design pr.cedur. yields tighter.UAV per.or.ance than an existing popular.PID contr.l technique.

关键词： Quadr.tor nonlinear contr.ller tr.jector. tr.cking backstepping contr.ller inver.e kinematics