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Distributio. o. heavy metals in so.ls o. Po.t Harco.rt and its enviro.s, Niger Delta, Nigeria

Chinese Jo.rnal o. Geo.hemistry 2011年第4期30卷 415-421页

作者： Minapuye I o.igi Lucky o. Ukren Hycienth o. Nwankwo.la Department o. Geo.o.y University of Port Harcourt

Geo.hemical evaluatio. o. the distributio. o. heavy metals in so.ls o. Po.t Harco.rt and its enviro.s in the Niger Delta regio. is presented in respect o. anthro.o.enic facto. and index o. geo.ccumulatio.. Sixteen (16) so.l samples were co.lected fro. two.ho.izo.s (0-10 cm and 100 cm) fro. the vario.s grids and analyzed. The geo.chemical analyses sho.ed the vertical and ho.izo.tal distributio.s o. heavy metals. The results sho.ed the ranges o. the metals determined as fo.lo.s: Pb (6.86-2.49)×10-6, with an average o. 4.63×10-6; Cd (0.05-0.00)×10-6, with an average o. 0.02×10-6, As (0.01-0.00)×10-6, with an average o. 0.00×10-6. Cu (15.36-10.80) ×10-6, with an average o. 13.36×10-6, and V (1.36-0.20)×10-6, with an average o. 0.94×10-6. Quantificatio. o. the degree o. po.lutio. was carried o.t using anthro.o.enic facto. (AF) and index o. geo.ccumulatio. (Igeo.. The Igeo.values o. 0.06, 0.02 and 0.00 fo. Pb, Cd and As, respectively indicate lo.-level co.taminatio. while Zn (1.14) and V (1.40) sho. me-dium-level co.taminatio.. The so.rces o. co.taminatio. are attributed to.urbanized anthro.o.enic activities. The majo.ity o. the samples analyzed sho. that the AF values are less than 1 with the exceptio. o. vanadium (V) who.e AF values range fro. 2.73 to.13.60×10-6. Vanadium is mo.e enriched than As, Cd, Pb, and Cu. The o.der o. degrees o. anthro.o.enic co.taminatio. and index o. geo.ccumulatio. in the so.l is V >Zn >Pb >Cu >Cd >AS. Metals were retained near the to. so.l and their co.centratio.s in the deepest ho.izo.s were lo.er and no.mal fo. unco.taminated so.ls. Metal co.centratio.s in the to. so.l ho.izo.s were significantly related to.distance fro. the industrial and hu-man activities.

关键词：三角洲地区重金属尼日尔土壤周围地区尼日利亚地积累指数污染程度

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Co.structing Restricted Patterso. Measures fo. Geo.etrically Infinite Kleinian Gro.ps

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Acta Mathematica Sinica,English Series 2006年第2期22卷 431-446页

作者： Kurt FALK Bernd o. STRATMANN Mathematical Institute University of Bern Mathematical Institute University of St Andrews North Haugh St Andrews KY16 9SS Scotland UK

In this paper, we study exhaustio.s, referred to.as p-restrictio.s, o. arbitrary no.elementary Kleinian gro.ps with at mo.t finitely many bo.nded parabo.ic elements. Special emphasis is put o. the geo.etrically infinite case, where we o.tain that the limit set o. each o. these Kleinian gro.ps co.tains an infinite family o. clo.ed subsets, referred to.as p-restricted limit sets, such that there is a Po.ncaré series and hence an expo.ent o. co.vergence δp, cano.ically asso.iated with every element in this family. Generalizing co.cepts which are well kno.n in the geo.etrically finite case, we then intro.uce the no.io. o. p-restricted Patterso. measure, and sho. that these measures are no.-ato.ic, δp-harmo.ic, δp-subco.fo.mal o. special sets and δp-co.fo.mal o. very special sets. Furthermo.e, we o.tain the results that each p-restrictio. o. o.r Kleinian gro.p is o. δp-divergence type and that the Hausdo.ff dimensio. o. the p-restricted limit set is equal to.δp.

关键词： Kleinian gro.p Patterso. measure Hausdo.ff dimensio.

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To.l geo.etry based predictio. o. critical thrust fo.ce while drilling carbo. fiber reinfo.ced po.ymers

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Advances in Manufacturing 2015年第4期3卷 300-308页

作者： Y. Karpat o. Bahtiyar Department o. Industrial Engineering Bilkent UniversityAnkara 06800 Turkey Turkish Aero.pace Industries Inc. Ankara 06980 Turkey

Carbo. fiber reinfo.ced po.ymers （CFRPs） are kno.n to.be difficult to.cut due to.the abrasive nature o. carbo. fibers and the lo. thermal co.ductivity o. the po.ymer matrix. Po.ycrystalline diamo.d （PCD） drills are co.mo.ly emplo.ed in CFRP drilling to.satisfy ho.e quality co.ditio.s with an acceptable to.l life. Drill geo.etry is kno.n to.be influential o. the ho.e quality and pro.uctivity o. the pro.ess. Co.sidering the variety o. CFRP laminates and available PCD drills o. the market, selecting the suitable drill design and pro.ess parameters fo. the CFRP material being machined is usually per- fo.med thro.gh trial and erro., In this study, machining perfo.mances o. fo.r different PCD drills are investigated. A mechanistic mo.el o. drilling is used to.reveal trade-o.fs in drill designs and it is sho.n that it can be used to.select suitable feed rate fo. a given CFRP drilling pro.ess.

关键词： Machining Drilling - Carbo. fiber reinfo.ced po.ymer (CFRP) Po.ycrystalline diamo.d (PCD) Delaminatio.

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Evaluatio. o. Transmutatio. o. ^137Cs（γ, n） 136Cs Using Ultra-Intense Lasers in So.id Targets

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Chinese Physics Letters 2006年第6期23卷 1434-1436页

作者： R. Sadighi-Bo.abi o. Ko.abee Department o. Physics Sharif University of Technology 11365-9161 Tehran Iran Department o. Mechanical Engineering Sharif University of Technology 11365-9567 Tehran Iran Bo.ab Research Centre 56515-196 Bonab Azerbaijan province Iran

Relativistic electro.s pro.uced in ultra-intense laser-so.id interactio. generate highly co.limated γ-ray beams thro.gh Bremsstrahlung that can be used to.induce pho.o.uclear reactio.s. Pho.o.uclear transmutatio. （o. （% n） type） o. ^137 Cs, o.e o. the hazardo.s nuclear wastes with half-life o. 30.17 years which canno. be transmuted practically with neutro. bo.bardment due to.its very lo. neutro. capture cro.s sectio., has been co.sidered. Nuclear activity o. pro.uced 136Cs with half-life o. 13.16 days has been evaluated analytically using available experimental data. With irradiating a ^137Cs sample by p-po.arized laser light o. 10^20 Wcm^-2 and the repetitio. rate o. 10Hz fo. 30min, the activity o. 0.24 Bq is o.tained. It is fo.nd that intensity has a large effect in yield aro.nd 10^21 Wcm^-2. Fo. similar laser with intensity o. 5 ×10^21 Wcm^-2, the activity increases with a facto. o. 10^5.

关键词： Transmutatio. 137Cs(γ,n) So.id Targets

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o.tical materials and metamaterials fro. nano.tructured so.t matter

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Nano.Research 2019年第9期12卷 2172-2183页

作者： Uri R. Gabinet Chinedum o. o.uji Chemical and Bio.o.ecular Engineering University of PennsylvaniaPhiladelphiaPA 19104USA

So.t materials such as blo.k co.o.ymers,liquid crystals and co.lo.dal assemblies are excellent candidates fo. use in o.tical applicatio.s due to.their ability to.spo.taneo.sly self-assemble into.o.dered structures o. o.tically-relevant length *** o. these applicatio.s rely o. o.tical pro.erties that are intrinsic to.the structure and chemical co.po.itio. o. the so.t material itself,while o.hers are reliant o. the presence o. ino.ganic nano.aterials within the so.t material to.pro.uce the pro.erties o. ***,so.t materials can be used to.*** pheno.ena that o.iginate no. just fro. the intrinsic pro.erties o. the nano.aterials,but fro. their spatial o.ganizatio. as *** the latter case,exo.ic o.tical pheno.ena such as light fo.using beyo.d the diffractio. limit,negative index o. refractio. and no.linear pho.o.ics *** pro.erties o.iginate fro. the co.lective respo.se o. multiple nano.tructures o.ganized to.pro.uce an o.dered *** materials,being an excellent medium to.co.vey o.der o. the nano.cale,can be utilized in next generatio. o.tical applicatio.s to.create this kind o. ***,we survey ho. so.t matter can be leveraged in o.tical applicatio.s by explo.ting self-assembly and directed self-assembly as metho.s to.pro.uce o.dered structures with desirable *** highlight applicatio.s where the so.t material is the o.tically active co.po.ent,and o.hers where it's used in tandem with ***,we fo.us o. ho. so.t materials can be used to.spatially o.ganize ino.ganic nano.aterials fo. use in o.tical applicatio.s where the co.tro.led assembly o. such nano.aterials is crucial.

关键词： so.t matter metamaterials blo.k co.o.ymers o.tical pro.erties pho.o.ic band gaps

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Thermo.ynamic analysis fo. a third grade fluid thro.gh a vertical channel with internal heat generatio.

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Jo.rnal o. Hydro.ynamics 2015年第2期27卷 264-272页

作者： ADESANYA Samuel o. MAKINDE o.uwo.e D. Department o. Mathematical Sciences Redeemer's University Faculty o. Military Science Stellenbosch University

This paper makes the thermo.ynamic analysis in fo.ced co.vective flo. o. a third grade fluid thro.gh a vertical channel. Due to.the reactive nature o. the fluid, the effect o. internal heat generatio. is co.sidered and assumed to.be a linear functio. o. temperature. The co.pled no.linear dimensio.less o.dinary differential equatio.s go.erning the fluid flo. are so.ved by using the Ado.ian deco.po.itio. metho.（ADM）. The effects o. vario.s physical parameters such as third grade material parameter, buo.ancy parameter and heat generatio. parameter o. the thermal structure o. flo. are presented and discussed.

关键词： energy co.servatio. vertical channel third grade fluid internal heat generatio. Ado.ian deco.po.itio. metho.(ADM)

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Impacts o. heavy metals o. 1,2-dichlo.o.thane bio.egradatio. in co.co.taminated so.l

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Jo.rnal o. Enviro.mental Sciences 2009年第5期21卷 661-666页

作者： Ademo.a o. o.aniran Adhika Balgo.ind Balakrishna Pillay Discipline o. Micro.io.o.y School of Biochemistry Genetics Microbiology and Plant Pathology Faculty of Science and Agriculture University of KwaZulu-Natal (Westville Campus) Private Bag X54001 Durban 4000 Republic of South Africa

1,2-Dichlo.o.thane （DCA）, a po.ential mutagen and carcino.en, is co.mo.ly intro.uced into.the enviro.ment thro.gh its industrial and agricultural use. In this study, the impact o. lead and mercury o. DCA degradatio. in so.l was investigated, o.ing to.the co.plex co.co.taminatio. pro.lem frequently enco.ntered in mo.t sites. 1,2-Dichlo.o.thane was degraded readily in bo.h co.taminated lo.m and clay so.ls with the degradatio. rate co.stants ranging between 0.370-0.536 week-1 and 0.309-0.417 week-1, respectively. The presence o. heavy metals have a negative impact o. DCA degradatio. in bo.h so.l types, resulting in up to.24.11% reductio. in DCA degradatio. within o.e week. Bo.h bio.timulatio. and treatment additives increased DCA degradatio., with the best degradatio. o.served upo. additio. o. gluco.e and a co.binatio. o. dipho.phate salt and so.ium chlo.ide, leading to.abo.t 17.91% and 43.50% increase in DCA degradatio., respectively. The results have pro.ising po.ential fo. effective remediatio. o. so.ls co.co.taminated with chlo.inated o.ganics and heavy metals. Ho.ever, the best bio.emediatio. strategy will depend o. the so.l types, micro.ial po.ulatio. present in the so.l matrices, nutrients availability and metal fo.ms.

关键词： bio.egradatio. bio.timulatio. co.co.taminatio. heavy metals treatment additives

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Co.firming no.thermal plasmo.ic effects enhance Co. methanatio. o. Rh/Tio. catalysts

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Nano.Research 2019年第8期12卷 1906-1911页

作者： Xueqian Li Henry o. Everitt Jie Liu Department o. Chemistry Duke UniversityDurhamNC 27708USA Army Co.bat Capabilities Develo.ment Co.mand Aviation & Missile CenterRedstone ArsenalAL 35898USA Department o. Physics Duke UniversityDurhamNC 27708USA

In so.e cases, illuminatio. o. traditio.al thermal catalysts and tailo.ed plasmo.ic pho.o.atalysts may synergistically co.bine thermal and no.thermal mechanisms to.enhance reactio. rates and impro.e pro.uct selectivity at reduced temperatures. To.understand ho. these attributes are achieved in plasmo.-driven catalysis, these intertwined thermal and no.thermal effects must be untangled. Here, we sho. ho. a no.el indirect illuminatio. technique, in co.junctio. with precisely mo.ito.ed thermal pro.iles o. the catalyst, can co.firm and clarify the ro.e o. no.thermal effects in plasmo.-enhanced carbo. dio.ide methanatio. o. a Rh/Tio. pho.o.atalyst. We find that the extracted no.thermal methane pro.uctio. rate has a linear dependence o. the to. surface temperature, distinctly different fro. an expo.ential dependence fo. thermal catalysis. We also.find that the apparent quantum efficiency fro. the no.thermal co.tributio. has no.dependence o. light intensity but maintains a linear dependence o. to. surface temperatures between 200 and 350℃. The clear expo.itio. o. no.thermal effects in the Rh/Tio. plasmo.ic pho.o.atalyst illustrates ho. this metho.o.o.y may be applied fo. the quantitative evaluatio. o. thermal and no.thermal light effects in o.her plasmo.-enhanced catalytic reactio.s.

关键词： carbo. dio.ide reductio. plasmo.ic pho.o.atalysis ho. carriers pho.o.hermal heating rho.ium nano.articles

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Dynamic stress co.centratio. in an infinitely lo.g cylindrical cavity due to.a po.nt spherical so.rce embedded within a fluid-saturated po.o.lastic fo.matio. o. infinite extent

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Applied Mathematics and Mechanics(English Editio.) 2025年第01期 139-156页

作者： H.Ho.SEINI o.BALILASHAKI Department o. Mechanical Engineering Faculty of EngineeringGolestan University

The effects o. a harmo.ically exciting mo.o.o.e so.rce o. an infinitely lo.g cylindrical cavity embedded entirely within a fluid-saturated po.o.lastic fo.matio. o. infinite extent are examined theo.etically. It is assumed that the so.rce is lo.ated o.tside the cavity at a specified distance fro. the bo.eho.e axis. The magnitudes o. the ho.p and radial stresses beside the po.e pressures exerted o. the interface and inside the po.o.s medium surro.nding the bo.eho.e are calculated and discussed. Bio.'s po.o.lastic mo.eling alo.g with three types o. bo.ndary co.ditio.s fo. the cylindrical interface including the ideal fluid, empty bo.eho.e, and rigid inclusio. with a hard bo.ndary is emplo.ed fo. the analysis. Utilizing a pro.er translatio.al additio. theo.em fo. expressing the incident spherical wave in terms o. cylindrical wave expansio.s, the pro.o.ed bo.ndary co.ditio.s at the interface are satisfied. Stresses are fo.mulated by means o. wave po.ential functio.s in a three-dimensio.al(3D) manner. The effects o. the frequency and the radial distance between the so.rce and bo.eho.e o. the induced stresses are examined fo. the first cylindrical mo.es o.er frequency spectra. Two.permeability co.ditio.s fo. the interface and three types o. so.ls fo. the po.o.s fo.matio. are co.sidered thro.gho.t the analysis. To.give an o.erall o.tline o. the study, a numerical example is presented. The results clearly indicate that the distance is a key parameter and has co.siderable effects o. the induced stress values. In additio., the interface permeability co.ditio. and so.l characteristics play an impo.tant ro.e in determining the dynamic respo.se o. the bo.eho.e. Finally,the o.tained results are co.pared with the relevant analyses existing in the literature fo. so.e limit cases, and go.d agreement is achieved.

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Electro.Hydro.ynamics and Kinetic Mo.eling o. Dry and Humid Air Flo.s Activated by Co.o.a Discharges

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Plasma Science and Techno.o.y 2016年第5期18卷 469-472页

作者： J. P. SARRETTE o. EICHWALD F. MARCHAL o. DUCASSE M. Yo.SFI CNRS LAPLACE Toulouse F-31062 France Universite de To.lo.se UPS INPTLAPLXCE (Laboratoire Plasma et Conversion d'Energie) Toulouse Cedex 9 F-31062 France

The present wo.k is devo.ed to.the 2D simulatio. o. a po.nt-to.plane Atmo.pheric Co.o.a Discharge Reacto. （ACDR） po.ered by a DC high vo.tage supply. The co.o.a reacto. is perio.ically cro.sed by thin mo.o.filamentary streamers with a natural repetitio. frequency o. so.e tens o. kHz. The study co.pares the results o.tained in dry air and in air mixed with a small amo.nt o. water vapo.r （humid air）. The simulatio. invo.ves the electro.dynamics~ chemical kinetics and neutral gas hydro.ynamics pheno.ena that influence the kinetics o. the chemical species transfo.matio.. Each discharge lasts abo.t o.e hundred o. a nano.eco.d while the po.t- discharge o.curring between two.successive discharges lasts o.e hundred o. a micro.eco.d. The ACDR is cro.sed by a lateral dry o. humid air flo. initially po.luted with 400 ppm o. No. After 5 ms, the time co.respo.ding to.the o.currence o. 50 successive discharge/po.t-discharge phases, a higher No.remo.al rate and a lo.er o.o.e pro.uctio. rate are fo.nd in humid air. This change is due to.the presence o. the Ho. species fo.med fro. the H primary radical in the discharge zo.e.

关键词： DC co.o.a discharge humid air chemistry plasma simulatio. No.treatment

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