检索结果-南通市图书馆

Irreversibility analysis o. unsteady co.ette flo. with variable visco.ity

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o. Hydro.ynamics 2015年第2期27卷 304-310页

作者： EEGUNJo.I A.S. MAKINDE o.D. TSHEHLA M.S. FRANKS o. Department o. Mathematics and Statistics Namibia University of Science and Technology Faculty o. Military Science Stellenbosch University Faculty o. Engineering Built Enviro.ment and Info.matio. Techno.o.y Nelson Mandela Metropolitan University Faculty o. Military Science Stellenbosch University

This paper investigates numerically the inherent irreversibility in unsteady generalized Co.ette flo. between two.parallel plates with variable visco.ity. The no.linear go.erning equatio.s are derived fro. the Navier-Sto.es equatio.s and so.ved numerically using a semi-discretizatio. finite difference metho. to.ether with the Runge-Kutta-Fehlberg integratio. scheme. The pro.iles o. velo.ity and the temperature o.tained are used to.co.pute the entro.y generatio. number, Bejan number, skin frictio. and Nusselt number. The effects o. embedded parameters o. entire flo. structure are presented graphically and discussed quantitatively.

关键词： parallel plates variable visco.ity heat transfer Co.ette flo. entro.y generatio.

Characterizatio. o. refracto.y behavio.r o. co.plex go.d/silver o.e by diagno.tic leaching

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第3期19卷 707-713页

作者： o. CELEP . ALP H. DEVEC M. VICIL Mining Engineering Department Karadeniz Technical University Geo.o.y Engineering Department Karadeniz Technical University

The amenability o. a refracto.y o.e to.the extractio. o. go.d and silver by cyanide leaching was investigated. Diagno.tic leaching tests were also.perfo.med to.shed light o. the refracto.y characteristics o. o.e. The leaching tests sho. that the extractio. o. go.d and silver is co.sistently lo., i.e. ≤47% and ≤19.2%, respectively, o.er a leaching perio. o. 24 h. Even fine grinding (e.g. o.s no. impro.e the reco.ery o. go.d and silver. Diagno.tic leaching appro.ch pro.ides info.matio. into.the cause o. the refracto.iness o. the o.e. The findings suggest that the refracto.iness is induced by the disseminatio. and encapsulatio. o. the very fine go.d and silver particles largely in the carbo.ates, o.ides and sulfides and, to.a small extent, with silicates present in the o.e matrix. These findings highlight the practical impo.tance o. diagno.tic leaching fo. the understanding o. the refracto.y characteristic o. such an o.e and fo. the identificatio. o. po.sible pretreatment o.tio.s to.o.erco.e its refracto.iness prio. to.cyanide leaching.

关键词：氰化浸出银矿石黄金诊断行为表征浸出试验硅酸盐矿石

Discrete Simulatio. o. Flexible Plate Structure Using State-Space Fo.mulatio.

在线全文

学校读者我要写书评

暂无评论

系统仿真学报 2008年第19期20卷 5141-5146页

作者： S. Md. Salleh M. o. To.hi Department o. Auto.atic Co.tro. and System Engineering The University of Sheffield Sheffield S3 1JD U. Kingdom Faeulty o. Mechanical and Manufacturing Engineering University of Tun Hussein Onn Malaysia 86400 Johor Malaysia

This paper presents the develo.ment o. dynamic simulatio. o. a flexible plate structure with vario.s bo.ndary co.ditio.s. A flexible square plate is co.sidered. A finite-difference metho. is used to.discretise the go.erning partial differential equatio. fo.mulatio. describing its dynamic behavio.r. The mo.el thus develo.ed has been validated against characteristic parameters o. the plate. The mo.el thus develo.ed is further fo.mulated using discrete state-space representatio., to.allo. easy and fast implementatio. fo. simulating the dynamic behavio.r o. the plate with vario.s bo.ndary co.ditio.s. The simulatio. algo.ithm thus develo.ed is validated, and accurate results with representatio. o. the first five mo.es o. vibratio. o. the plate have been achieved. The algo.ithm thus develo.ed is used in subsequent research wo.k as a platfo.m fo. develo.ment and verificatio. o. suitable co.tro. strategies fo. vibratio. suppressio. o. flexible plate structures.

关键词：复杂系统模拟技术平面结构分析方法系统结构

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

Earthquake engineering research needs in light o. lesso.s learned fro. the 2011 To.o.u earthquake

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibratio. 2014年第S1期13卷 141-149页

作者： Masayo.hi Nakashima oren.Lavan Masahiro.Kurata Yunbiao.Luo Disaster Preventio. Research Institute (DPRI) Kyoto University Pro.esso. Disaster Preventio. Research Institute (DPRI) Kyoto UniversityGokashoUjiKyotoJapan Faculty o. Civil and Enviro.mental Engineering Technion–Israel Institute of TechnologyHaifaIsrael Assistant Pro.esso. Po.t Do.to.al Fello.

Earthquake engineering research and develo.ment have received much attentio. since the first half o. the twentieth century. This valuable research presented a huge step fo.ward in understanding earthquake hazard mitigatio.,which resulted in appreciable reductio. o. the effects o. past earthquakes. Nevertheless,the 2011 To.o.u earthquake and the subsequent tsunami resulted in majo. damage. This paper presents the timeline o. earthquake mitigatio. and reco.ery,as seen by the autho.s. Po.sible research directio.s where the autho.s think that many o.en questio.s still remain are identified. These are primarily based o. the impo.tant lesso.s learned fro. the 2011 To.o.u earthquake.

关键词： research needs earthquake engineering quick reco.ery 2011 To.o.u earthquake

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

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

维普期刊数据库评论

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

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

维普期刊数据库评论

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.ifluoren. (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.ifluoren. (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.