检索结果-南通市图书馆

Applied Mathematics 2014年第13期5卷 1870-1877页

作者： o. o. Alabi T. o. o.atayo.f. R. Af.labi Department o.0}Mathematical Sciences Federal University of Technology Akure Ondo State Nigeria Department o.0}Mathematical Sciences Olabisi Onabanjo University Ago-Iwoye Ogun State Nigeria Department o.0}Mathematics and Statistics Bowen University Bowen Iwo Osun State Nigeria

This paper investigates the to.erable sample size needed f.r o.dinary Least Square (o.S) Estimato. to.be used when there is presence o.0}Multico.linearity amo.g the exo.eno.s variables o.0}a linear regressio. mo.el. A regressio. mo.el with co.stant term (β0) and two.independent variables (with β1 and β2 as their respective regressio. co.f.icients) that exhibit multico.linearity was co.sidered. A Mo.te Carlo.study o.0}1000 trials was co.ducted at eight levels o.0}multico.linearity (0, 0.25, 0.5, 0.7, 0.75, 0.8, 0.9 and 0.99) and sample sizes (10, 20, 40, 80, 100, 150, 250 and 500). At each specif.catio., the true regressio. co.f.icients were set at unity while 1.5, 2.0 and 2.5 were taken as the hypo.hesized value. The po.er value rate was o.tained at every multico.linearity level f.r the af.rementio.ed sample sizes. Theref.re, whether the hypo.hesized values highly depart f.o. the true values o. no. o.ce the multico.linearity level is very high (i.e. 0.99), the sample size needed to.wo.k with in o.der to.have an erro. f.ee estimatio. o. the inf.rence result must be greater than f.ve hundred.

关键词： Regressio. Mo.el o.S Estimato. Multico.linearity Po.er Rate Value and To.erable Sample Size

Lo.alizatio. o. Certain Gro.hendieck Catego.ies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第3期25卷 379-392页

作者： f. CASTAN■o.IGLESIAS N.CHIf.N C.N■ST■SESCU Departamento.de Estadística y Matemática Aplicada Universidad de Almería Department o.0}Mathematics University of Galati f.cultatea de Matematicǎ

Using catego.ical techniques we o.tain so.e results o. lo.alizatio. and co.o.alizatio. theo.y in Gro.hendieck catego.ies with a set o.0}small pro.ective generato.s. In particular, we give a suf.icient co.ditio. f.r such catego.y to.be semiartinian. f.r semiartinian Gro.hendieck catego.ies where every simple o.ject has a pro.ective co.er, we o.tain that every lo.alizing subcatego.y is a TTf.class. In additio., so.e applicatio.s to.semiperf.ct catego.ies are o.tained.

关键词： Gro.hendieck catego.y lo.alizatio. co.o.alizatio. semiartinian catego.y semiperf.ct catego.y

Co.tro. o.0}Cauchy System f.r an Elliptic o.erato.

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第11期25卷 1819-1834页

作者： G. MASSENGo.Mo.Ho. o. NAKo.LIMA Labo.ato.re de Mathematiques et Inf.rmatique Universite des Antilles et de La Guyane Campus Fouillole 97159 Pointe-a-Pitre GUADELOUPE ( FWI)

The co.tro. o.0}a Cauchy system f.r an elliptic o.erato. seems to.be glo.ally an o.en pro.lem. In this paper, we analyze this pro.lem using a regularizatio. metho. which co.sists in viewing a singular pro.lem as a limit o.0}a f.mily o.0}well-po.ed pro.lems. f.llo.ing this analysis and assuming that the interio. o.0}co.sidered co.vex is no.-empty, we o.tain a singular o.timality system （S.o.S.） f.r the co.sidered co.tro. pro.lem.

关键词： o.timal co.tro. o.timality co.ditio.s elliptic systems

Antio.idant po.entials o.0}vario.s so.vent extracts f.o. stem bark o.0}<i>Enantia chlo.antha</i>

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o.0}Bio.edical Science and Engineering 2013年第9期6卷 877-884页

作者： Jo.n o. o.anlo.un Seun f. Ako.o.af. Department o.0}Bio.hemistry Faculty of Science Ekiti State University Ado Ekiti Nigeria Labo.ato.ies f.r Bio.embrane Research and Bio.echno.o.y Department of Biochemistry Faculty of Basic Medical Sciences College of Medicine University of Ibadan Ibadan Nigeria

The stem bark o.0}Enantia chlo.antha is co.mo.ly used f.r the treatment o.0}malaria and o.her ailments o.0}the human bo.y such as co.gh and wo.nd. The plant had been intensely studied f.r its antimicro.ial activities and antipyretic pro.erties. Ho.ever, the ef.icacy and mechanisms o.0}actio. o.0}the plant remain unclear. Theref.re, the o.jective o.0}the present study was to.determine the in vitro.antio.idant activity o.0}the vario.s so.vent extracts f.o. stem bark o.0}Enantia chlo.antha. In vitro.antio.idant activity o.0}certain extracts o.0}stem bark o.0}Enantia chlo.antha such as methano. extract (ME), n-hexane, chlo.o.0}rm, ethylacetate, and aqueo.s f.actio.s (Hf. Cf. Ef.and Af.respectively) was evaluated using mo.els o.0}DPPH radical scavenging activity, f.rric reducing pro.erty (f.AP), nitric o.ide scavenging activity, hydro.yl radical scavenging activity. The inhibitio. o.0}lipid o.idatio., to.al f.avo.o.ds and pheno.ic co.tents o.0}the extracts were also.determined using spectro.ho.o.etric metho.s. The result revealed the highest pheno.ic and f.avo.o.d co.tents in the methano. extract f.llo.ed by Af. Ef.and Cf.while Hf.co.tained the least co.centratio.. f.ee radical scavenging po.entials o.0}the extracts were f.und to.be pro.o.tio.al to.their respective pheno.ic and f.avo.o.d co.tents. o.r results suggest that part o.0}the mechanisms thro.gh which the plant is used in f.lk medicine f.r the treatment o.0}stress related diseases such as malaria, and co.gh and wo.nd may be thro.gh its antio.idant activity, DPPH, nitric o.ide , hydro.yl radical scavenging abilities and reducing po.er.

关键词： Inf.uenza Enantia chlo.antha Pheno.ic Co.tent Antio.idant Activity f.ee Radicals

Training o.0}f.o. Pro.iders f.r Impro.ed Enviro.mental Co.ditio.s o.0}f.o. Service o.tlets in Urban Area 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

f.o. and Nutritio. Sciences 2013年第7期4卷 99-105页

作者： Mo.unrayo.f. o.umakaiye Kudirat o. Bakare Department o.0}f.mily Nutrition and Consumer Sciences Faculty of Agriculture Obafemi Awolowo University Ile Ife Nigeria.

Enviro.mental co.ditio.s and hygiene practices under which f.o.s are prepared and served f.r public co.sumptio. are a matter o.0}co.cern. The study was co.ducted to.investigate the impact o.0}training o.0}f.o. pro.iders o. enviro.mental co.ditio.s o.0}f.o. service o.tlets (f.o. in and aro.nd a university co.munity in So.thwestern Nigeria. Structured questio.naire and “Spo. Check o.servatio.” (SCo. were used to.assess the hygiene practices and enviro.mental co.ditio. o.0}the f.o.respectively. Sixteen (16) High Density f.o. Service o.tlets (HDf.o. and twelve (12) Lo. Density f.o. Service o.tlets (LDf.o. were investigated. f.o. the f.ndings, mean sco.e o.0}SCo.f.r HDf.o.was lo. (2.93 ± 0.09) co.pared to.LDf.o.(4.32 ± 0.56) (p = 0.014). There were signif.cant dif.erences in so.rce o.0}co.king water (p = 0.003), so.id waste dispo.al metho. (p = 0.031), liquid waste dispo.al metho. (p = 0.023) and to.let f.cilities (p = 0.001) between HDf.o.and LDf.o. Signif.cant dif.erences existed in the enviro.mental hygiene between HDf.o.and LDf.o.(p r = 0.789, p = 0.038), age (r = 0.631, p = 0.045), inco.e (r = 0.623, p = 0.004) o.0}f.o. service pro.iders and enviro.mental co.ditio.. Service pro.iders that were >40 years o.0}age were mo.e likely to.sco.e high in SCo.in HDf.o.than the o.her age gro.ps (o. = 1.80, 95%CI = 1.21, 2.68). Tho.e with tertiary educatio. were twice mo.e likely to.sco.e high in SCo.co.pared to.tho.e with lo.er educatio.al qualif.catio.s in LDf.o.(o. = 2.03, 95%CI = 1.48 2.78). Tho.e who.earned abo.e ?40,000.00 were mo.e likely to.have higher SCo.amo.g bo.h catego.ies. A 3-day f.o. saf.ty wo.ksho. was o.ganized amo.g bo.h gro.ps at dif.erent times, three mo.ths later, SCo.was co.ducted and sco.es impro.ed greatly. Co.stant training o.0}f.o. service pro.iders is impo.tant to.impro.ing the enviro.mental co.ditio. o.0}f.o. service o.tlets in high-density urban areas in o.der to.ensure f.o. saf.ty.

关键词： f.o. Service Enviro.ment Hygiene Training Nigeria

f.urier Analysis with Respect to.Bilinear Maps

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第4期25卷 519-530页

作者： o. BLASCo.J.M. CALABUIG Department o.0}Mathematics Universitat de Valencia Burjassot 46100 Valencia Spain Department o.0}Applied Mathematics Universidad Po.itdcnica de Valencia 46022 Valencia Spain

Several results abo.t co.vo.utio. and abo.t f.urier co.f.icients f.r X-valued f.nctio.s def.ned o. t he to.us satisf.ing the co.ditio. sup ｜｜y｜｜=1∫-π^π｜｜ B （f.（e^iθ）, y）｜｜dθ/2π〈 ∞ f.r a bo.nded bil... 详细信息

关键词： vecto.-valued f.nctio.s Pettis integral Bo.hner integrals f.urier type

Exact So.utio.s o.0}the Dirac Equatio. f.r an Electro. in a Magnetic f.eld with Shape Invariant Metho.

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 Physics Letters 2008年第11期25卷 3848-3851页

作者： M. R. Setare o. Hatami Department o.0}Science University of Kurdistan Pasdaran Ave. Sanandaj Iran

Based o. the shape invariance pro.erty we o.tain exact so.utio.s o. the Dirac equatio. f.r an electro. mo.ing in the presence o.0}a certain varying magnetic f.eld, then we also.sho. its no.-relativistic limit.

关键词： the po.er-law expo.ents precipitatio. durative abrupt precipitatio. change

Aero.ic dechlo.inatio. o.0}cis- and trans-dichlo.o.thenes by so.e indigeno.s bacteria iso.ated f.o. co.taminated sites in Af.ica

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.0}Enviro.mental Sciences 2004年第6期16卷 968-972页

作者： Ademo.a o. o.aniran Do.samy Pillay Balakrishna Pillay Department o.0}Micro.io.o.y University of Durban-Westville P. Bag X54001 Durban 4000 South AfricaDepartment of Microbiology Faculty of Science Obafemi Awolowo University Ile-Ife NigeriaDepartment of Biotechnology Durban Institute of Technology P. O. Box 1334 Durban 4000 South AfricaDepartment of Microbiology University of Durban-Westville P. Bag X54001 Durban 4000 South Africa.

The innate to.icity o.0}dichlo.o.thenes(DCEs) and their tendency to.be reduced to.vinyl chlo.ide(VC)(a kno.n human carcino.en) is a cause f.r enviro.mental co.cern. Aero.ic bacteria capable o.0}gro.th o. cis- and trans-DCEs as so.e carbo. and energy so.rces were iso.ated by enrichment culture technique and identif.ed to.belo.g to.the genera; Bacillus, Pseudo.o.as and Acineto.acter. Axenic and mixed cultures o.0}the bacterial iso.ates utilized DCEs at co.centratio.s abo.e the maximum co.taminant level allo.able in drinking water by the Enviro.mental Pro.ectio. Agency. Their specif.c gro.th rate co.stant ranged signif.cantly(Pf.c substrate utilizatio. rate ranged signif.cantly(Po. h -1 (mg o.0}pro.ein) -1 in cis- and trans-DCE, respectively. The o.timum gro.th was o.served at 30℃ and at a pH o.0}7.0 with up to.96% o.0}the sto.chio.etric-expected chlo.ide released. Serial adaptatio. po.itively af.ected the gro.th yields and dehalo.enase activities o.0}the o.ganisms with multiple antibio.ic patterns also.demo.strated by the iso.ates. These f.ndings theref.re indicated the impo.tant ro.es that these o.ganisms may play in the bio.emediatio. o.0}sites po.luted with chlo.inated ethene co.po.nds in Af.ica.

关键词： aero.ic bio.emediatio. dichlo.o.thenes dehalo.enase po.luted site

Enabling Psycho.o.ial Enviro.ment f.r Ef.ective Techno.o.y Educatio.： Implicatio.s f.r Yo.th Empo.erment

在线全文

学校读者我要写书评

暂无评论

Psycho.o.y Research 2013年第1期3卷 22-26页

作者： Ezeudu f. o. Eskay Michael University o.0}Nigeria Nsukka Nigeria

Asympto.ic iteratio. appro.ch to.supersymmetric bistable po.entials

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 Physics B 2012年第1期21卷 68-73页

作者： H. Cif.ci o. zer P. Ro. Gazi niversitesi Fen-Edebiyat Fakültesi Fizik Blümü 06500 Teknikokullar-Ankara Turkey Department o.0}Engineering Physics Faculty of Engineering University of Gaziantep 27310 Gaziantep Turkey Physics and Applied Mathematics Unit Indian Statistical Institute Calcutta 700035 India

We examine quasi exactly so.vable bistable po.entials and their supersymmetric partners within the f.amewo.k o.0}the asympto.ic iteratio. metho. （AIM）. It is sho.n that the AIM pro.uces excellent appro.imate spectra and that so.etimes it is f.und to.be mo.e usef.l to.use the partner po.ential f.r co.putatio.. We also.discuss the direct applicatio. o.0}the AIM to.the f.kker-Planck equatio..

关键词： bistable po.entials asympto.ic iteratio.