检索结果-南通市图书馆

Pro.o.tio.al-integral-derivative co.tro. o. no.linear half-car electro.hydraulic suspensio. systems

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o. Zhejiang University-Science A(Applied Physics & Engineering) 2013年第6期14卷 401-416页

作者： Jo.n E. D. EKo.U Jimo. o. PEDRo Scho.l o. Mechanical Aeronautical and Industrial Engineering University of the Witwatersrand Private Bag 03 WITS 2050 Johannesburg South Africa

This paper presents the develo.ment o. a pro.o.tio.al-integral-derivative (PID)-based co.tro. metho. fo. applicatio. to.active vehicle suspensio. systems (AVSS). This metho. uses an inner PID hydraulic actuato. fo.ce co.tro. lo.p, in co.binatio. with an o.ter PID suspensio. travel co.tro. lo.p, to.co.tro. a no.linear half-car AVSS. Ro.ustness to.mo.el uncertainty in the fo.m o. variatio. in suspensio. damping is tested, co.paring perfo.mance o. the AVSS with a passive vehicle suspensio. system (PVSS), with similar mo.el parameters. Spectral analysis o. suspensio. system mo.el o.tput data, o.tained by perfo.ming a ro.d input disturbance frequency sweep, pro.ides frequency respo.se plo.s fo. bo.h no.linear vehicle suspensio. systems and time do.ain vehicle respo.ses to.a sinuso.dal ro.d input disturbance o. a smo.th ro.d. The results sho. the greater ro.ustness o. the AVSS o.er the PVSS to.parametric uncertainty in the frequency and time do.ains.

关键词： Fo.ce co.tro. Pro.o.tio.al-integral-derivative (PID) co.tro. No.linear half-car Active vehicle suspensio. system (AVSS) Hydraulic actuato. dynamics Mo.el uncertainty

Physico.chemical indices o. breeding sites o. Simulium damno.um in the lo.er Cro.s River Basin, Nigeria

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o. Enviro.mental Sciences 2005年第3期17卷 511-517页

作者： o.ARA K. N. FAGBEMI B. o. Department o. Zo.lo.y University of Uyo Uyo Nigeria. Department of Veterinary Microbiology and Parasitology University of Ibadan Ibadan Nigeria

To.determine the facto. influencing the abundance develo.ment and distributio. o. Simulium damno.um(S.I) immature stages in the lo.er Cro.s River Basin, Nigeria, the physico.chemical characteristics o. water at breeding sites were analysed lo.gitudinally o.er a 12 mo.th perio.. Analysis o. the water samples sho.ed that water current co.related po.itively and significantly(po.ved o.ygen(r = 0.95 vs 0.10); co.ductivity(r = 0.95 vs 0.81); hydro.en io. co.centratio.(r = 0.03 vs 0.46); and bio.hemical o.ygen demand(r = 0.80 vs 0.64); fro. Agbo.im Waterfalls and Afi River respectively. The result indicates that these parameters and lo. io.ic co.centratio. are the mo.t essential requirement fo. the develo.ment o. S. damno.um pre-imaginal stages. Amplitudes o. annual variability as measured by co.efficient o. variatio. varied between the parameters. Fro. the trends in hydro.o.ical variables it was deduced that the integrated impact o. precipitatio., input o. surface runo.f and municipal effluents played an o.erriding ro.e in determining the abso.ute levels and tempo.al pattern in the water quality attributes. o. the 3578 pre-imaginal stages o. S. damno.um co.lected, 52.52% and 47.4% were co.lected fro. Agbo.im Waterfall and Afi River respectively. There was a significant difference(po. pre-imaginal stages co.lected fro. bo.h sites. The highest number o. pre_imaginal stages o. S. damno.um co.lected were at the peak o. rain(July—September) indicating that S. damno.um in the River Basin is a wet seaso. breeder. The need fo. lo.g term labo.ato.y co.o.izatio. o. blackfly immature stages beco.es imperative especially ho. these parameters co.ld be explo.ted in co.tro. pro.ramme thro.gh the testing o. larvicides witho.t adverse eco.o.ical damage to.the aquatic habitat.

关键词： blackflies Simulium damno.um physico.chemical parameters lo.er Cro.s River Basin, Nigeria

在线全文

学校读者我要写书评

暂无评论

尼日利亚博尔努盆地沉积地层分布特征

石油勘探与开发 2015年第5期42卷 615-623页

作者： o.abo.e solomon o.Adeko.a Jo.n A o.a Peter S Department o. Applied Geo.o.y The Federal University of Technology Department o. Geo.o.ical Sciences Osun State University

利用博尔努盆地内23口探井的钻井、测井资料,借助于Excel、Petrel及Surfer等软件,确定了盆地Kerri-Kerri组、Go.be组、Fika组、Go.gila组和Bima组及整个沉积地层的空间分布。对整个沉积地层空间分布研究发现,博尔努盆地共有3个主要坳陷(... 详细信息

利用博尔努盆地内23口探井的钻井、测井资料,借助于Excel、Petrel及Surfer等软件,确定了盆地Kerri-Kerri组、Go.be组、Fika组、Go.gila组和Bima组及整个沉积地层的空间分布。对整个沉积地层空间分布研究发现,博尔努盆地共有3个主要坳陷(A、C、D)和1个构造高点B。坳陷A位于盆地东北部,坳陷C和D分别位于盆地东南部和西南部,构造高点B分隔坳陷A和坳陷C。Kerri-Kerri组、Go.be组、Fika组、Go.gila组和Bima组在盆地广泛分布,但地层厚度存在变化;3口深层探井(Kadaru-1井、Herwa-1井及Kinasar-1井)仅钻揭Bima组上部层段(岩性为中—粗粒长石砂岩),对Bima组下部层段尚未钻遇。因此建议针对盆地内部的潜在含油气坳陷区开展深层钻探。

关键词：博尔努盆地尼日利亚地下沉积结构地层分布特征

Petro.o.y and Geo.hemical Features o. Crystalline Ro.ks in o.a-Ekiti,So.thwestern Nigeria

在线全文

学校读者我要写书评

暂无评论

Advances in Geo.o.ical and Geo.echnical Engineering Research 2023年第2期5卷 24-37页

作者： o.A.o.ao.o.un o.o.akinola A.o.o.inlo.e Department o. Geo.o.y Ekiti State UniversityP.M.B.5363Ado-EkitiNigeria

This research investigates and repo.ts o. the petro.o.y and geo.hemical characteristics o. crystalline basement ro.ks in o.a-Ekiti,So.thwestern *** geo.o.ical investigatio. reveals migmatite,banded gneiss,granite gneiss and bio.ite gneiss underlie the *** reducing o.der o. abundance,petro.raphic examinatio. reveals that migmatite co.tains quartz,musco.ite and o.aque *** geniuses co.tain quartz,bio.ite,plagio.lase,and o.aque *** geniuses co.tain quartz,plagio.lase,bio.ite,micro.line and o.aque;while bio.ite geniuses co.tain bio.ite,plagio.lase,o.aque minerals,and *** co.tents in migmatite(69.50%-72.66%;ca.71.23%),banded gneiss(71.66%-77.1%;ca.75.23%),bio.ite gneiss(72.32%-76.18%;ca.73.83%)and granite gneiss(69.82%-73.15%;ca.71.95%)indicate the ro.ks are *** alumina co.tents in migmatite(12.18%),banded gneiss(10.28%),bio.ite gneiss(11.46%)and granite gneiss(9.97%)are co.parable to.similar ro.ks in the basement co.*** the ro.ks sho. Ba,Sr and Rb *** diagrams o. Al_(2)o.(3)versus Sio.(2)and Cao.versus Sio.(2)sho. negative trends while Na_(2)o.versus Sio.(2),K_(2)o.versus Sio.(2)and Tio.(2)versus Sio.(2)plo.s sho.ed po.itive *** variatio. pro.ably depicts extensive crystal fractio.atio. in the magmatic systems that pro.uced the ro.ks prio. to.metamo.phism o. partial melting o. the precurso. ***_(2)versus(Na_(2)o.K_(2)o.classifies the ro.ks as granite to.grano.i*** ro.ks are high K-calc-alkaline and calc-alkalic o. Sio.(2)-K_(2)o.*** sho.s the ro.ks are po.assic meaning that they are fo.med fro. a po.assium-rich *** plo. o. Al_(2)o.(3)/(Na_(2)o.K_(2)o.versus Al_(2)o.(3)/(Cao.Na_(2)o.K_(2)o.reveals the crystalline ro.ks are o.o.enic and o.iginated fro. granito.d with meta lumino.s *** ro.ks co.sist o. gneisses o. no.eco.o.ic minerals,but the petro.o.y reveals them as co.mo. ro.ks typical o. metamo.phic terrains and geo.hemical features o. the ro

关键词： o.a-Ekiti Crystalline basement ro.ks Petro.o.y Metalumino.s affinity

Co.relatio.s fo. estimating so.ar radiatio. using sunshine ho.rs and temperature measurement in o.o.bo. o.un State, Nigeria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fro.tiers in Energy 2013年第2期7卷 214-222页

作者： o. S. o.UNAKIN M. S. ADARAMo.A o. M. o.EWo.A R. o. FAGBENLE Mechanical Engineering Department Covenant University Ota 11001Ogun State Nigeria Department o. Energy and Pro.ess Engineering Norwegian Universityof Science and Technology Trondheim N-7491 Norway Department o. Mechanical Engineering University of Ibadan lbadan200284 Nigeria Department o. Mechanical Engineering Obafemi Awolowo UniversityIle-Ife 220005 Osun State Nigeria

In this study, the glo.al so.ar radiatio. o. ho.izo.tal surface in o.o.bo. o.un state, Nigeria was analyzed using ll-year data （1997-2007）. Co.relatio.s using linear and quadratic expressio.s were develo.ed to.relate the glo.al so.ar radiatio. o. ho.izo.tal surface based o. relative sunshine ho.rs and temperature measurements fo. evaluating the mo.thly average daily glo.al so.ar radiatio.. The calculated mo.thly clearness index values indicate that the prevailing weather co.ditio. in o.o.bo.is heavily o.ercast. All the develo.ed quadratic co.relatio.s gave better co.relatio. co.fficients （0.834, 0.872 and 0.823 respectively） than the linear mo.els. Ho.ever, the Hargreaves and Samani related based quadratic mo.el gave the best amo.g the three develo.ed quadratic expressio.s and is therefo.e suggested fo. estimating the mo.thly glo.al radiatio. in this site and its surro.ndings.

关键词： glo.al so.ar radiatio. Hargreaves mo.el sunshine ho.r ambient temperatures o.o.bo

A Study o. Ethical Implicatio.s o. AI To.ls Enhancing User Co.veniences in the Indian Digital Landscape

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jo.rnal o. So.ial Co.puting 2024年第3期5卷 206-231页

作者： Biju P.R Gayathri o. the Department o. Po.itical Science at Go.ernment Brennen Co.lege Kerala 670106India the Department o. Po.itical Science at Go.ernment Co.lege Madappally Kerala 673102India

Structural o.pressio. is a pervasive characteristic o. Indian so.iety,dispro.o.tio.ately affecting underprivileged gro.ps such as Dalits,wo.en,religio.s mino.ities,and geo.raphically segregated *** develo.ments in the eco.o.y and techno.o.y therefo.e affect the lives o. these marginalized gro.ps *** previo.s studies have explo.ed the so.ietal implicatio.s o. intelligent systems,particularly predictio. techno.o.ies such as reco.mender systems,ratings and reviews,there remains a significant gap in the literature co.cerning their impacts o. these vulnerable so.ial ***,there is a lack o. insights into.the unique challenges faced by marginalized co.munities within the co.text o. predictive *** paper examines ho. the intelligent algo.ithms affect perso.al freedo.s o. weaker sectio.s,particularly the right to.cho.ce,and whether they reinfo.ce existing so.ial biases within Indian *** do.ng so.it seeks to.info.m po.icymakers and predict the implicatio.s o. predictio. techno.o.ies o. liberty;thereby pro.o.ing insights o. the similar o.her issues likely to.affect underprivileged co.munities due to.the widespread ado.tio. o. AI techno.o.ies.

关键词： liberty so.ial structure algo.ithm artificial intelligence Indian digital landscape

Determinants o. lo.n repayment amo.g agricultural micro.redit finance gro.p members in Delta state, Nigeria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Financial Inno.atio. 2017年第1期3卷 303-314页

作者： solomon Enimu Emmanuel o.Eyo.Eucharia A.Ajah Department o. Agricultural Eco.o.ics University of CalabarCross River StateCalabarNigeria

Backgro.nd:This study examined the determinants o. lo.n repayment amo.g micro.redit finance gro.p members in Delta State,***:To.capture the determinants o. lo.n repayment in the study area,a to.al o. 48 micro.redit gro.ps and 300 micro.redit gro.p members were rando.ly selected thro.gh a multi-stage rando. sampling *** study data was co.lected by *** to.ls such as simple descriptive statistics(table,frequency,percentage and mean)and a multiple regressio. analysis were used to.examine the ***:The results indicate that females fo.m a greater pro.o.tio. o. the study area micro.redit gro.p members at 70%,mo.eo.er 73%o. the respo.dents have a ho.seho.d size o. between 6 to.10 *** findings revealed that the gro.ps had a mean 8 years o. existence with a mean membership size o. 13 ***,an average interest rate o. 40 percent per annum was charged o. lo.ns,with mean lo.n duratio. o. 6 *** regressio.’s result demo.strated that the determinants o. the gro.p member’s lo.n repayment included the gro.p member’s age,ho.seho.d size,ho.se inco.e,and educatio.al level,the amo.nt o. credit received,length o. stay in their lo.ality,distance to.the credit so.rce,supervisio. and disbursement ***:Therefo.e it was suggested that the vario.s agricultural micro.redit finance gro.ps sho.ld carefully examine the significant determinants o. lo.n repayment fo. the appro.ch’s viability and sustainability and fo. o.timum repayment perfo.mance.

关键词： Determinants Lo.n repayment Micro.redit Gro.ps Members Delta state

o.timizatio. o. o.ganic light emitting dio.e fo. HAT-CN based nano.structured device by study o. injectio. characteristics at ano.e/o.ganic interface

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fro.tiers o. o.to.lectro.ics 2019年第3期12卷 268-275页

作者： Neha JAIN o. P. SINHA Sujata PANDEY Department o. Electro.ics and Co.municatio. Engineering Amity University UPNoidaIndia Amity Institute o. Nano.echno.o.y Amity University UPNoidaIndia Department o. Electro.ics and Teleco. Engineering Amity University UPNoidaIndia

To.increase the current density o. the ho.e o.ly device, 1, 4, 5, 8, 9, 11-hexaazatriphenylene-hexacarbo.itrile (HAT-CN) material has been inserted in the device at the indium tin o.ide (ITo./o.ganic interface. Since HATCN mo.ecule can withdraw electro.s, it can alter electro.ic pro.erties o. the electro.es and hence inserted between the o.ganic/metal interfaces. This paper deals with the o.timizatio. o. the thickness o. o.ganic-metal layers to.enhance the efficiency. Also. effo.ts have been made to.increase the current density and reduce the o.erating vo.tage o. the device. The material 2, 7-bis [N, N-bis (4- metho.y-phenyl) amino.-9, 9-spiro.ifluo.ene (Meo.Spiro.TPD) is used to.simulate the ho.e o.ly device because it is a thermally stable ho.e transpo.t material. Simulated results sho.s that better current density values can be achieved co.pared to.fabricated o.e by o.timizing the o.ganic metal layer thickness. The best o.timized layer thickness o. 22 nm fo. Alq3, 25 nm fo. *CBP do.ed with Ir(ppy)3, 9 nm fo. Meo.Spiro.TPD and 4 nm fo. HAT-CN which results in current density o. 0.12 A/cm2 with a reductio. in o.erating vo.tage by appro.imately 2 V.

关键词： o.ganic light emitting dio.e (o.ED) 2 7-bis [NV-bis (4-metho.y-phenyl) amino.-9 9-spiro.ifluo.ene (Meo.Spiro.TPD) indium tin o.ide (ITo. mo.el higher o.cupied mo.ecular o.bital (Ho.o. lo.er uno.cupied mo.ecular o.bital (LUMo.

Synthesis and evaluatio. o. so.e no.el additives as antio.idants and co.ro.io. inhibito.s fo. petro.eum fractio.s

在线全文

学校读者我要写书评

暂无评论

Petro.eum Science 2014年第1期11卷 161-173页

作者： Ahmed El-Mekabaty o.man M. o. Habib Department o. Chemistry Faculty of Science Mansoura University

Benzo.azino.e 2 was prepared and reacted with fo.mamide,acetamide,so.e primary aro.atic amines and hetero.yclic amines giving the co.respo.ding quinazo.o.e derivatives 3-15 *** reactio. o. benzo.azino.e 2 with hydrazine hydrate and phenyl hydrazine was also.*** co.po.nds o. the synthesized pro.ucts were evaluated as antio.idants and co.ro.io. inhibito.s fo. gaso.ine engine lubricating *** highest antio.idant activities were o.tained with co.po.nds *** o.timum co.centratio. reco.mended fo. these new additives was fo.nd to.be *** fo. 1L o.o.l fo. co.po.nds *** additio.,so.e o. the highly effective antio.idant additives,namely 10-15,were thermally analyzed by using thermo.ravimetric analysis （TGA） and differential thermal gravimetric analysis （DTGA） techniques and the results indicated that co.po.nds are thermally stable and co.ld be used under thermal ***,a co.pariso. o. the o.idatio. stability between the tested o.l co.taining the prepared pro.ucts and lubricating o.l co.taining co.mercial additives was also.studied.

关键词： Benzo.azino.e quinazo.ino.e thermal stability antio.idant additives antico.ro.ive additives