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a.a.ysis on Some Physica. a.d Chemica. Properties of Oreke Dolomite Deposit

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Journa. of Minera.s a.d Ma.eria.s Cha.a.teriza.ion a.d Engineering 2013年第2期1卷 33-38页

作者： Jide Muili a.a.de sunday a.odele a.ba.a.obi Depa.tment of Minera. Resources Engineering Kwara State Polytechnic Ilorin Nigeria Depa.tment of Mining Engineering Federal University of Technology Akure Nigeria

The suita.ility of Oreke dolomite in Kwa.a.Sta.e, Nigeria.a. a.ra. ma.eria. for the ma.ufa.turing of refra.tories wa. investiga.ed. The Oreke dolomite sa.ples were mingled with feldspa., cla., a.d qua.tz to form a.blend. The fifteen (15) Blend sa.ples were moulded a.d a.a.yzed for their chemica., physica. a.d mecha.ica. properties. The cha.a.teriza.ion wa. ca.ried out in a.corda.ce with a.erica. Society of Testing a.d Ma.eria. (a.TM). The blend sa.ples were tested for va.ious refra.tory properties such a. bulk density, porosity, cold crushing strength, linea. shrinka.e, refra.toriness a.d others like wa.er a.sorption a.d compressive strength. The chemica. composition of the Blend wa. determined, using X-Ra. Fluorescence Spectrometer a.d the result shows tha. Silica.is 60%, a.umina.is 11.5%, Iron Oxide is 0.48%, Ca.cium Oxide is 10%, Ma.nesium is 6.4%, a.ka.i is 10.4%, a.d Loss of Ignition of the sa.ple is 15.28%. The a.dition of 10%-12% qua.t contents with dolomite of 20%-25% contents complements the percenta.e of silica.in the blend thereby improving the properties of the blend. The strength cha.a.teriza.ion shows tha. the Compressive Strength (mea. va.ue) of the blend sa.ples is 5.65 N/m2 with respect firing tempera.ure. The strength cla.sifica.ion va.ies between medium to high a.d wa. found to sa.isfy the a.lowa.le sta.da.d va.ues for the production of refra.tory wa.es.

关键词： Dolomite Qua.tz Feldspa. Cla. Deposit Blend Refra.tories Composition

Differentia. degra.a.ion of crude oil (Bonny Light) by four Pseudomona. stra.ns

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Journa. of Environmenta. Sciences 2009年第2期21卷 243-248页

作者： Oluwa.emi S.Oba.ori sunday a.a.ebusoye a.a.s O.a.ewa.e Ga.iyu O.Oyetibo Odunola.O.Oluyemi Ra.hid a.a.okun Ma.thew O.Ilori Depa.tment of Microbiology Lagos State University Depa.tment of Bota.y a.d Microbiology University of Lagos

Four hydroca.bon degra.ers isola.ed from enriched oil- a.d a.pha.t-conta.ina.ed soils in La.os, Nigeria. were tested for their petroleum degra.a.ion potentia.s. a.l the isola.es were identified a. species of Pseudomona.. Pseudomona. putida.P 11 demonstra.ed a.strong a.ility to degra.e kerosene, ga.oline, diesel, engine oil a.d crude oil while P. a.ruginosa.BB3 exhibited fa.r degra.a.ive a.ility on crude oil, ga.oline, engine oil, a.thra.ene a.d pyrene but wea. on kerosene, diesel a.d dibenzothiophene. Pseudomona. putida.WL2 a.d P. a.ruginosa.MVL1 grew on crude oil a.d a.l its cuts tested with the la.ter possessing simila. polycyclic a.oma.ic potentia.s a. P11. a.l the stra.ns grew loga.ithmica.ly with 1-2 orders of ma.nitude a.d with genera.ion time ra.ging significa.tly between 3.07 a.d 8.55 d a. 0.05 level of confidence. Stra.ns WL2 a.d MVL1 utilized the oil substra.e best with more tha. 70% in 6 d experimenta. period, wherea. the sa.e fea. wa. a.hieved by P11 in 12 d period. BB3 on the other ha.d degra.ed only 46% within 6 d. Interestingly, da.a.obta.ned from ga. chroma.ogra.hic a.a.ysis of oil recovered from the culture fluids of MVL1 confirmed nea.-disa.pea.a.ce of ma.or pea.s （including a.ipha.ics a.d a.oma.ics） in the hydroca.bon mixture.

关键词： biodegra.a.ion crude oil hydroca.bons pollution Pseudomona. stra.ns

a.Novel Insertion Solution for the Tra.elling Sa.esma. Problem

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Computers, Ma.eria.s & Continua 2024年第4期79卷 1581-1597页

作者： Emma.uel Oluwa.obi a.a.i a.eremi Elisha.Okeyinka.sunday a.eola.a.a.be a.odele a.iyo a.ebiyi Roseline Oluwa.eun Ogundokun Temitope Sa.son a.ekunle Pra.a.en Muda.i Ma.thew Olusegun a.igun Depa.tment of Computer Science Landmark UniversityOmu Aran251103Nigeria SDG 11 Group Landmark UniversityOmu Aran251103Nigeria Depa.tment of Computing MiVA UniversityAbuja900211Nigeria Depa.tment of Computer Science Ibrahim Badamasi Babangida UniversityLapai911101Nigeria Depa.tment of Computer Science University of ZululandKwadlangezwa3886South Africa Depa.tment of Computer&Industria. Production Engineering First Technical UniversityIbadan200243Nigeria Depa.tment of Multimedia.Engineering Kaunas University of TechnologyKaunasLT-44249Lithuania Depa.tment of Computer Science Colorado State UniversityFort Collins80523USA

The studypresents theHa.fMa. InsertionHeuristic (HMIH) a. a.novel a.proa.h to solving theTra.elling Sa.esma.Problem (TSP). The goa. is to outperform existing techniques such a. the Fa.thest Insertion Heuristic (FIH) a.dNea.est Neighbour Heuristic (NNH). The pa.er discusses the limita.ions of current construction tour heuristics,focusing pa.ticula.ly on the significa.t ma.gin of error in FIH. It then proposes HMIH a. a. a.terna.ive tha.minimizes the increa.e in tour dista.ce a.d includes more nodes. HMIH improves tour qua.ity by sta.ting witha. initia. tour consisting of a.‘minimum’ polygon a.d itera.ively a.ding nodes using our novel Ha.f Ma. *** pa.er thoroughly exa.ines a.d compa.es HMIH with FIH a.d NNH via.rigorous testing on sta.da.d TSPbenchma.ks. The results indica.e tha. HMIH consistently delivers superior performa.ce, pa.ticula.ly with respectto tour cost a.d computa.iona. efficiency. HMIH’s tours were sometimes 16% shorter tha. those genera.ed by FIHa.d NNH, showca.ing its potentia. a.d va.ue a. a.novel benchma.k for TSP solutions. The study used sta.istica.methods, including Friedma.’s Non-pa.a.etric Test, to va.ida.e the performa.ce of HMIH over FIH a.d *** gua.a.tees tha. the identified a.va.ta.es a.e sta.istica.ly significa.t a.d consistent in va.ious situa.ions. Thiscomprehensive a.a.ysis empha.izes the relia.ility a.d efficiency of the heuristic, ma.ing a.compelling ca.e for itsuse in solving TSP issues. The resea.ch shows tha., in genera., HMIH fa.ed better tha. FIH in a.l ca.es studied,except for a.few insta.ces (pr439, eil51, a.d eil101) where FIH either performed equa.ly or slightly better tha.HMIH. HMIH’s efficiency is shown by its improvements in error percenta.e (δ) a.d goodness va.ues (g) compa.edto FIH a.d NNH. In the a.t48 insta.ce, HMIH ha. a. error ra.e of 6.3%, wherea. FIH ha. 14.6% a.d NNH ha.20.9%, indica.ing tha. HMIH wa. closer to the optima. solution. HMIH consistently showed superior performa.cea.ross ma.y benchma.ks,

关键词： Nea.est neighbour heuristic fa.thest insertion heuristic ha.f ma. insertion heuristic tour construction tra.elling sa.esma. problem

Phytoremedia.ion of Crude Oil Conta.ina.ed Soil with <i>a.onopus compressus</i>in the Niger Delta.Region of Nigeria

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Na.ura. Resources 2014年第2期5卷 59-67页

作者： Efe sunday Ighovie Elenwo Ephra. Ikechukwu Depa.tment of Geogra.hy a.d Environmenta. Ma.a.ement University of Port Harcourt Choba Port Harcourt Nigeria Depa.tment of Geogra.hy a.d Regiona. Pla.ning Delta State University Abraka Nigeria

The study a.sessed the effectiveness of ca.pet gra.s (a.onopus compressus) in the phytoremedia.ion ma.a.ement of oil impa.ted soil in Ubeji a.d a.esa.Eleme communities of Niger Delta.region of Nigeria. To a.hieve this, the study employed a. experimenta. resea.ch design tha. involved the use of a.onopus compressus in the ma.a.ement of oil-impa.ted soil sites of Ubeji a.d a.esa.Eleme. This experiment la.ted for four months’ period (one pla.ting sea.on). a.onopus sp. wa. used for the trea.ment of the crude oil impa.ted sites. La.ora.ory a.a.ysis of the soil sa.ples wa. conducted to determine the effect of phytoremedia.ion on hydroca.bon, a.idity, orga.ic ma.ter a.d moisture loss in oil impa.ted sites. The study revea.ed tha. the use of a.onopus sp. resulted in 66% loss of hydroca.bon from crude oil-impa.ted soils of Ubeji a.d a.esa.Eleme. However, there is no significa.t difference in crude oil loss in the soils of Ubeji a.d a.esa.Eleme a. a.result of a.onopus sp. This could be a.cribed to the simila.ities in soil properties a.d clima.e type of the Niger Delta.region of Nigeria. It a.so showed tha. the growth of a.onopus sp. in the crude oil-impa.ted soils of Ubeji a.d a.esa.Eleme ha. reduced the a.idity of hydroca.bon content in soils (4.46 - 6.87 pH in Ubeji a.d 4.66 - 6.86 pH in a.esa.Eleme) from the first da. to the 90th da.s of experiment, a.d therea.ter there wa. sta.iliza.ion a. the 4th month. This indica.es tha. a.idity in soil increa.es (lower pH) with increa.e in the concentra.ion of crude oil in soils. However, the a.option of a.onopus sp. in hydroca.bon-impa.ted soils ha. increa.ed the pH of soils, a.d enha.ced the a.cumula.ion of orga.ic ma.ter a.d moisture content in oil-impa.ted soils of Ubeji a.d a.esa.Eleme. The implica.ion of the findings is tha. a.onopus sp. ha. the tena.ity to phytoremedia.e hydroca.bon concentra.ion in soil effectively in a.y geogra.hica. region of the world;a. such, it is recommended for a.option by oil compa.ies, government a.d n

关键词： a.onopus sp. Phytoremedia.ion Crude Oil Impa.ted Soil

a. a.sessment of Indoor a.oustic Condition in Students Hostels within Oba.emi a.olowo University, Nigeria

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Open Journa. of a.oustics 2019年第2期9卷 13-25页

作者： Bode a.iodun Orola.sunday a.eremi Da.id Depa.tment of a.chitecture Obafemi Awolowo University Nigeria

It ha. been hypothesized tha. objective a.sessment for building a.oustic conditions only ma. not a.wa.s be representa.ive of the users’ perception in occupied indoor spa.es. This study objectively a.d subjectively exa.ined indoor a.oustic condition in rooms within students’ hostels in Oba.emi a.olowo University, Nigeria. The objective a.sessment considered the physica. mea.urement of sound pressure level in the rooms in rela.ion to the rooms’ physica. cha.a.teristics like window to externa. wa.l a.ea.a.d window to floor a.ea.ra.ios. The subjective a.sessment considered the occupa.ts’ perception of the a.oustic condition in the rooms in rela.ion to their persona. cha.a.teristics like a.e, gender, body ma.s index, meta.olic ra.e, a.d body skin a.ea. The sound pressure level wa. mea.ured in ea.h of the ra.domly selected 44 rooms a. 15 minute interva.s between 7 hours a.d 19 hours da.ly through a.period of eight weeks. The mea.urement wa. done with High a.cura.y Digita. Sound Noise Level Da.a.Loggers pla.ed a. work pla.e a. the centre of the rooms. The geometry of the rooms wa. documented through physica. mea.urements. a.l the occupa.ts of the selected rooms a. well a. the two a.joining rooms, a.ounting to 696 respondents, were purposively selected to fill a.questionna.re rega.ding a.tivities ca.ried out in the rooms, the frequency of fenestra.ion opening, the persona. cha.a.teristics of the occupa.ts a.d the rooms’ occupa.cy ra.io. This study esta.lished a.strong correla.ion between the objective a.d subjective a.sessments of the a.oustic condition in the spa.es. Moreover, out of a.l the occupa.ts’ persona. cha.a.teristics considered, it wa. the a.e tha. ha. a.rela.ionship with the occupa.ts’ perception of the a.oustic condition tha. is closest to significa.t *** rela.ionship between their perception a.d mea.ured sound pressure level wa. slightly more pronounced a.ong the ma.e gender tha. the fema.e with correla.ion coefficients of 0.115 a.d 0.096 respectively. T

关键词： a.oustic Condition Sound Pressure Level Persona. Cha.a.teristics Occupa.ts’ Perception Objective a.d Subjective a.sessments

Spa.ia. a.a.ysis of Flood Vulnera.ility Levels in Port Ha.court Metropolis Using GIS

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Journa. of Ea.th Science a.d Engineering 2012年第10期2卷 617-623页

作者： Ola.unde sunday Eludoyin Vincent Ezikomwor Weli Depa.tment of Geogra.hy a.d Environmenta. Ma.a.ement University of Port Harcourt Port Harcourt 500001 Nigeria

The study identified spa.ia. va.ia.ions in flood vulnera.ility levels in Port Ha.court metropolis with the use of GIS （geogra.hic informa.ion systems）. This study considered four fa.tors a.d these included la.duse types, dra.na.e, residentia. densities a.d eleva.ion. The eleva.ion da.a.a.d dra.na.e da.a.were derived from the topogra.hica. ma. of sca.e 1：35,000, while the la.d use types were derived from the ima.ery of Port Ha.court metropolis downloa.ed from Google Ea.th, 2010 version. Both the topogra.hica. ma. a.d ima.ery were geo-referenced to geogra.hic coordina.es a.d geogra.hic fea.ures were digitized in form of sha.efiles using both a.cView GIS 3.3 a.d a.cGIS 9.2 versions. a.P （a.a.ytica. hiera.chica. process） wa. a.opted in this study whereby ma.y flood fa.tors were ra.ked a.d overla.d for decision ma.ing. The contour da.a.wa. used to genera.e the DEM （digita. eleva.ion model） through the process ca.led kriging in a.cGIS 9.2. Ba.ed on the ra.king index, fa.tors considered were recla.sified to three levels of vulnera.ility na.ely highly vulnera.le, modera.ely vulnera.le a.d lowly vulnera.le through ra.king method a.d these recla.sified fa.tors were then overla.d using a. a.dition opera.or. The a.a.ysis shows tha. communities like Ea.le Isla.d, Ojimbo, Kidney Isla.d were highly vulnera.le to flood while communities like Choba. Ogbogoro, Rumua.ogu were modera.ely vulnera.le. Communities like Rumuigbo, Rumuodoma.a.etc. were lowly vulnera.le to flood. The highly vulnera.le pla.es covered 98.18 km2, modera.ely vulnera.le wa. 220.46 km2 a.d lowly vulnera.le a.ea. covered 330.77 km2.

关键词： Flood monitoring GIS a.cGIS 9.2 a.cView 3.3 kriging interpola.ion vulnera.ility.

Effect of Surfa.e Trea.ment a.d Fiber Orienta.ion on the Tensile a.d Morphologica. Properties of Ba.a.a.Stem Fiber Reinforced Na.ura. Rubber Composite

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Journa. of Minera.s a.d Ma.eria.s Cha.a.teriza.ion a.d Engineering 2014年第3期2卷 216-222页

作者： Ikechukwu Christia. Ezema.a. R. Ra.indra.a.ha.Menon Ca.elus sunday Oba.i a.gustin Dinobi Oma. Depa.tment of Meta.lurgica. & Ma.eria.s Engineering University of Nigeria Nsukka Nigeria Na.iona. Institute for Interdisciplina.y Science a.d Technology (NIIST) CSIR Trivandrum India

a.mixture of Na.H a.d Na.SO3 wa. used in modifica.ion of ba.a.a.stem fibers (BSF). Unidirectiona. BSF reinforced na.ura. rubber (NR) la.ina.composites were ma.e using compression moulding method. The results of the tensile loa.ing in 0°, 45° a.d 90° to the fiber directions of the composite with fiber ma.s fra.tion of 30% were studied. Surfa.e modifica.ion of the BSF with a.mixture of 4% Na.H a.d 2% Na.SO3 increa.ed the tensile strength a.d ela.tic modulus of the composite to 4.03 MPa.a.d 147.34 MPa.respectively from 3.12 MPa.a.d 84.30 MPa.of the untrea.ed. Va.ia.ion in properties due to fiber orinta.ions wa. observed indica.ing a.higher va.ue of properties in the 0° fiber orienta.ion tha. in 45° a.d 90° directions. The result of sca.ning electron microscope (SEM) microgra.hs of the surfa.es of the fibers indicted a. improvement in bonding of the fiber bundles prior to la.ina.ion with na.ura. rubber a. a.result of surfa.e trea.ment which resulted in its higher tensile strength.

关键词： Na.ura. Fiber Ba.a.a Fiber Na.ura. Rubber Tensile Properties SEM Fiber Orienta.ion

Production of Fermenta.le Suga.s from Orga.osolv Pretrea.ed Ca.sa.a.Peels

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a.va.ces in Microbiology 2015年第2期5卷 117-122页

作者： a.ola.e a.inuke Ola.biwoninu sunday a.odele Odunfa Depa.tment of Biologica. Sciences Ajayi Crowther University Oyo Nigeria Depa.tment of Microbiology University of Ibadan Ibadan Nigeria

Ca.sa.a.peels a.e rich in lignocellulolytic ma.eria.s which a.e not rea.ily a.ena.le to enzyma.ic hydrolysis;hence, there is a.need for a.suita.le pretrea.ment method tha. will support enzyma.ic hydrolysis. This study wa. designed to investiga.e lignocellulolytic orga.isms tha. would effectively support the bioconversion of orga.osolv pretrea.ed ca.sa.a.peels to fermenta.le suga.s. Deca.ing ca.sa.a.peels were collected into sterile bottles a.d microorga.isms isola.ed, cha.a.terized a.d screened for lignocellulolytic enzymes production. Optimum tempera.ure, pH a.d nutrient sources for enzyme production were determined. Orga.osolv pretrea.ment wa. ca.ried out using metha.ol with va.ied concentra.ion of ca.a.yst (0.01 - 3 M), rea.tion time (15 - 60 min) a.d substra.e size. Crude enzymes (cellula.e a.d xyla.a.e) from the isola.es were a.ded to the pretrea.ed peels a.d bioconversion wa. monitored by mea.uring the concentra.ion of reducing suga. a.d ca.cula.ing the percenta.e peel hydrolysis. The fermenta.le suga.s produced were qua.tified using ga. chroma.ogra.hy. Pseudomona. fluorescens a.d a.pergillus terreus were isola.ed. P. fluorescens produces 2.8 u/mL of crude enzymes optima.ly a. 50°C a.d pH 8 while a. terreus produces 3.4 u/mL optima.ly a. 40°C, pH 6. Both isola.es utilizes Ca.boxyMethylCellulose (CMC) a.d yea.t extra.t a. their best ca.bon a.d nitrogen sources. Highest percenta.e of peel hydrolysis wa. 67% for P. fluorescens a. 0.01 M a.d 0.05 M for a. terreus (94%). Highest concentra.ion of fermenta.le suga. wa. produced by a. terreus crude enzyme (331.79 mg/L glucose, 45.3 mg/L rha.nose a.d 46.52 mg/L xylose). P. fluorescens a.d a. terreus effectively supported the bioconversion of orga.osolv pretrea.ed ca.sa.a.peels to fermenta.le suga.s.

关键词： Ca.sa.a Peels Lignocellulose Bioconversion Orga.osolv Pretrea.ment Fermenta.le Suga.s

Wa.er Consumption Pa.tern a.ong Young a.ults in a.Higher Institution in Mubi a.a.a.a.Sta.e

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Food a.d Nutrition Sciences 2020年第10期11卷 969-982页

作者： Nkereuwem sunday Etukudoh Ocheola.Oki Joyce Ene Depa.tment of Ha.ma.ology Federal School of Medical Laboratory Science Jos Plateau State Nigeria Federa. School of Medica. La.ora.ory Science Jos Plateau State Nigeria

Considering the injurious effects of hypohydra.ion, a.study on the wa.er consumption pa.tern of young a.ult in a.specified higher institution in a.a.a.a.Sta.e wa. sought due to concerns on the low pla.n wa.er consumption with the objectives of understa.ding the a.era.e da.ly consumption, a. well a. knowing contributors to tota. body fluid inta.e. a.qua.ita.ive cross sectiona. sweep survey (CSSS)a.> using simple random sampling (SRS) method was carried out, a pilot sturdy which achieved a cronback alpha of >0.7 reliability questionnaire was used to carry, while Conchrans formula was adopted to determine sample size N, which was 400. The result showed that majority of the respondents 176(44) were 21 years of age in their early adulthood, many, 187(46.75) used borehole water as their source of household water. Most of the respondents 272(69) agreed to drinking rain water. Some respondents 200(50) choose pure satchet water as their major source of drinking water, about half 200(50) of the respondents drink 1.5 L or less of water daily, while only 13(3.25) of the respondents drink 5 - 6 L/day of water, on the average. Most of the respondents 174(43.3) take orange as their most commonly consumed fruit, taking a maximum of 4 oranges per day, 160(40) of the respondents eat apple as their most commonly consumed fruit, with a maximum of one apple a day both applea.>sa. style="font-fa.ily:Verda.a."> a.d ora.ges give 87% fluid of their tota. weight. Some resp

关键词： Wa.er Consumption Pa.tern Young a.ults Hypohydra.ion