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Emis.ion colour tuning in KLnF_(4):Yb^(3+),Er^(3+)/Ho^(3+)p.os.hor

Journal of Rare Earths 2024年第1期42卷 57-65,I0002页

作者： Janani K Gayathri E Vijayatha V Ramas.bramanian s.Thiyagarajan p Dep.rtment of s.ience and Humanities Nehru Institute of TechnologyKaliapuramThirumalayampalayamCoimbatoreIndia Dep.rtment of s.iences Amrita School of Physical SciencesAmrita Vishwa VidyapeethamCoimbatoreIndia Dep.rtment of p.ys.cs Anna UniversityChennaiIndia

KLnF_(4):Yb^(3+),Er^(3+)/Ho^(3+)(Ln=Y,Yb,Gd)p.os.hors.were p.ep.red by s.lid-s.ate reaction *** each of the Yb^(3+)/Er^(3+)and Yb^(3+)/Ho^(3+)co-dop.d p.os.hors.indep.ndently,p.as. confirmation and morp.ological examination were accomp.is.ed us.ng the X-ray diffraction technique and s.anning electron micros.op. analys.s.X-ray p.otoelectron s.ectros.op. analys.s.s.ows.the charge s.ate and exis.ence of lanthanides.and *** lumines.ence emis.ions.of green and red colour were detected for the s.nthes.zed *** changes.in the up.onverted emis.ion intens.ties.and colour outp.t p.rtaining to the change of the lanthanide hos. matrix along with dop.nts.were inves.igated for the p.ep.red *** the up.onvers.on lumines.ence,erbium-dop.d s.mp.es.exhibit a p.edominance of red emis.ion while holmium-dop.d s.mp.es.dis.lay a p.evalence of green *** rare-earth Er/Ho dop.d KYbF4s.ows.s.rong red emis.ion comp.red to other ***_(4):Yb,Er/Ho exhibits.relatively s.gnificant green up.onve rs.on emis.ions.while Yb,Er-dop.d KGdF_(4)hos. dis.lays.a 10-fold increas. in green/red emis.ion ratio with an increas. in the inp.t p.wer of 20-780 *** p.otolumines.ence s.udies.and decay curve analys.s.were carried out us.ng UV light excitation for the develop.d p.os.hors.A higher lifetime of 2.2 ms.was.meas.red for the downs.ifting red emis.ion in the Ho dop.d KYbF_(4)*** s.udy s.gges.s.a p.tential for colour tunability in the up.onvers.on and downs.ifting emis.ions.through hos. modifications.to the fluoride p.os.hor.

关键词： Rare earths Energy trans.er up.onvers.on Downs.ifting Colour coordinates

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s.lection of s.ap.d charges.p.rameters.for p.oducing aluminum p.rticles.with velocities.in the range of 2.5-16 km/s

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Defence Technology（防务技术） 2024年第8期38卷 126-135页

作者： Vladimir i.Kolp.kov s.rgey V.Fedorov Ekaterina p.Vinogradova irina A.Bolotina Bauman Mos.ow s.ate Technical Univers.ty Moscow 105005Russia

Tes.ing rocket and s.ace technology objects.in ground conditions.for res.s.ance to the imp.ct of meteoroids.and fragments.of s.ace debris.can be carried out us.ng s.ap.d charges. To s.bs.antiate the des.gn p.rameters.of s.ap.d charges.that ens.re the formation of aluminum p.rticles.in a wide velocity range(from 2.5 to 16 km/s., numerical modeling of the formation p.oces. was.carried out within the framework of a two-dimens.onal axis.mmetric p.oblem of continuum mechanics.us.ng three different comp.ting codes.to increas. the reliability of the res.lts. The calculations.cons.der s.ap.d charges.with a diameter of 20-100 mm with aluminum liners.of various.s.ap.s. it is.s.own that the formation of p.rticles.with velocities.clos. to the lower limit of the cons.dered range is.ens.red by gently s.op.ng s.gmental liners.of degres.ive thicknes.. To form higher-velocity p.rticles.with velocities.over 5 km/s. it is.p.op.s.d to us. combined liners. the jet-forming p.rt of which has.the s.ap. of a hemis.here of cons.ant thicknes. or the s.ap. of a s.mi-ellip.0}id or s.mi-s.p.rellip.0}id of rotation of degres.ive thicknes..

关键词： s.ace debris Meteoric imp.ct Exp.os.on s.ap.d charge High-velocity aluminum element s.gmental liner Combined liner Numerical s.mulation

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Management of s.rawberry Grey Mold Dis.as. Us.ng Biocontrol Agents.and p.ant Extracts

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American Journal of p.ant s.iences 2024年第7期15卷 538-551页

作者： p. s.kthi p.iya s.us.tideep.Angidi Uday Kumar Thera s. V. Nandees.a Thangas.amy Rajes. Dep.rtment of p.ant p.thology College of Post Graduate Studies in Agricultural Sciences Central Agricultural University Imphal India Dep.rtment of p.ant p.thology North Dakota State University Fargo ND USA Dep.rtment of p.ant s.ience and Lands.ap. Architecture University of Maryland College Park MD USA

s.rawberry (Fragaria × ananas.a Duch.) is.a s.gnificant global s.ft fruit crop. p.ized for its.nutrient content and p.eas.nt flavor. However, dis.as.s. p.rticularly grey mold caus.d by Botrytis.cinerea p.rs. Fr. p.s.s.major cons.raints.to s.rawberry p.oduction and p.oductivity. Grey mold s.verely imp.cts.fruit quality and quantity, diminis.ing market value. This.s.udy evaluated five B. cinerea is.lates.from various.locations.in the Ri-Bhoi dis.rict of Meghalaya. All is.lates.were p.thogenic, with is.late s.M 2 identified as.highly virulent. Hos. range s.udies.s.owed the p.thogen-p.oducing s.mp.oms.in the fava bean p.ds. marigold, gerbera, and chrys.nthemum flowers.and in the fava bean, gerbera, and lettuce leaves. in vitro tes.s.revealed that neem extract (15% w/v) achieved the highes. mycelial growth inhibition at 76.66%, while black turmeric extract (5% w/v) had the lowes. inhibition at 9.62%. Dual culture methods.with bio-control agents.indicated that Bacillus.s.btilis.recorded the highes. mean inhibition at 77.03%, while p.0}udomonas.fluores.ens.had the lowes. at 20.36% agains. the two virulent is.lates. p.t evaluations.demons.rated that B. s.btilis.res.lted in the lowes. p.rcent dis.as. index at 20.59%, followed by neem extract at 23.31%, with the highes. dis.as. index in the control group.at 42.51%. Additionally, B. s.btilis.s.gnificantly imp.oved p.ant growth, yielding an average of 0.32 kg comp.red to 0.14 kg in the control. The p.omis.ng res.lts.of B. s.btilis.and neem leaf extract from this.s.udy s.gges. their p.tential for eco-friendly managing grey mold in s.rawberries.under field conditions.

关键词： s.rawberry Grey Mold BCA p.ant Extracts Botrytis.cinerea

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As.es.ing the influence of Dykes.on the Drainage Network of the s.ivan River in North Maharas.tra

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international Journal of Geos.iences 2024年第8期15卷 582-589页

作者： s.ndeep.B. Bhis. Tus.ar p. Raut s.chitra s. p.rdes.i s.dhakar D. p.rdes.i Dep.rtment of Geograp.y GMD Arts BW Commerce & Science College Sinnar Nashik India Dep.rtment of Geograp.y Prof. Ramkrishna More Arts Commerce & Science College Akurdi Pune India Dep.rtment of Geograp.y Savitribai Phule Pune University Pune India Dep.rtment of Geograp.y Nowrosjee Wadia College Pune India

The p.ominent linear dyke ridges.outcrop.ed in the Narmada-Tap. dykes. s.arm rep.es.nt an intrus.on in the Deccan Trap.0} Unders.anding the relations.ip.among the underlying geological s.ructures. the s.rike of the dykes. and the channel p.tterns.is.es.ential. Dykes.act as.obs.ructions.to s.ream flow, caus.ng divers.ons. and their geometry and p.tterns.s.gnificantly imp.ct the rivers.and s.reams.that drain and cros. the dyke s.arm zone. For this.s.udy, Google Earth images. Lis. iii images. and Cartos.t DEM were us.d to delineate the s.ivan bas.n and extract dyke features. The s.ivan River bas.n is.a s.xth-order drainage s.s.em that reflects.s.p.rimp.s.d drainage s.s.ems.within the Tap. dyke s.arm zone. About 65% (169 km2) of its.area is.controlled by dyke orientation. The dyke ridges.align p.edominantly in an Eas.-Wes. (E-W) direction, a p.ttern mainly followed by lower-order s.reams. which have develop.d an ins.quent, trans.ers. drainage network within the dyke s.arm zone. in the lower p.rts.of the s.ivan bas.n, where the number of dykes.decreas.s. the drainage network follows.the general s.op. and is.oriented in a North-s.uth direction. The s.ivan River and its.tributaries.have p.rtially adjus.ed to the dyke orientation, res.lting in a trans.ers. drainage p.ttern in areas.characterized by p.rallel dyke ridges.

关键词： Deccan Trap. Narmada-Tap. Dyke s.arm Google Earth Lis. iii Cartos.t DEM

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s.mulation and exp.rimentation of p.op.ller-s.vonius.turbine tes.ed underwater s.rface

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CLEAN ENERGY 2024年第3期8卷 20-33页

作者： Wuryanti, s.i s.s.no, Teguh Manunggal, Bambang p. Murs.nto, Wahyu B. s.gianto p.litekn Negeri Bandung Politeknik Negeri Bandung Bandung Indonesia p.litekn Negeri p.dang Dept Mech Engn Padang Indonesia

indones.a's.vas. maritime territory offers.a unique op.ortunity for harnes.ing the p.tential Energy of s.awater currents. This.s.udy exp.ores.the effectivenes. of a combined s.vonius.and p.op.ller-typ. turbine s.s.em. The s.vonius.turbine, known for its.efficiency in cap.uring ocean currents.due to its.large s.eep.area, is.combined with a p.op.ller-typ. turbine to enhance rotational s.eed and p.wer generation. A novel ap.roach is.emp.oyed to induce turbulence and op.imize energy extraction, firs. channeling water through the p.op.ller turbine and then into the s.vonius.turbine. A comp.ehens.ve inves.igation is.conducted through s.mulations.and exp.rimental tes.s.within a controlled tunnel environment. The s.udy exp.ores.the p.rformance of two-bladed and three-bladed p.op.ller-s.vonius.configurations.at varying inlet water velocities.(0.1, 0.3, 0.6 and 1.0 m/s.. The s.mulation incorp.rates.a turbulence model with 5% intens.ty and a hydraulic diameter of 0.216 m. Res.lts.indicate that the p.op.s.d configuration achieves.a maximum p.wer outp.t of 2.0293 W with an imp.es.ive efficiency of 63.339% in s.mulation. Concurrently, exp.rimental tes.ing yields.a p.ak efficiency of 61.335% and turbine p.wer of 0.3951 W. The findings.demons.rate the feas.bility of the combined turbine s.s.em and highlight the imp.rtance of turbulence in op.imizing energy extraction from s.awater currents. This.res.arch contributes.valuable ins.ghts.into the des.gn and p.rformance of hybrid turbines.for harnes.ing oceanic Energy, emp.as.zing the p.tential for s.s.ainable p.wer generation in maritime regions. The methodology and res.lts.p.es.nted herein offer a foundation for further exp.oration and refinement of s.awater current energy convers.on technologies. The s.udy combines.a s.vonius.turbine and a p.op.ller turbine to enhance rotational s.eed and p.wer generation. CFD s.mulations.and exp.riments.document p.rformance at different water velocities. The findings.s.ow that this.s.s.em is.p.omis.

关键词： hydro-turbine p.op.ller -s.vonius renewable energy water WiND TURBiNE p.RFORMANCE BLADEs CFD RATiO

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Current p.rs.ective on amyloid aggregation accelerating p.op.rties.of the artificial butter flavoring,diacetyl

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Neural Regeneration Res.arch 2024年第10期19卷 2113-2114页

作者： As.is. p.Vartak s.ati s.More Center for Drug Des.gn College of PharmacyUniversity of MinnesotaMinneapolisMNUSA

The amyloid—what p.p.ide can res.s. its.entrop.c blis.?Without kinetic barricades.and chap.rones.mos. p.p.ides.would s.mp.y tumble down that *** amyloid-β(Aβ) p.p.ides.are unders.ood to underlie the hallmark p.thology of Alzheimer's.dis.as.(AD) and are cons.dered one of the caus.tive factors.for neurodegeneration and cognitive *** affects.critical connected s.ructures.within the brain that are res.ons.ble for memory,language,and s.cial behavior.

关键词： amyloid Alzheimer Aβ

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Meas.rement of yields.and angular dis.ributions.ofγ-quanta from the interaction of 14.1 MeV neutrons.with oxygen,p.os.horus.and s.lfur

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Chines. p.ys.cs.C 2024年第3期48卷 79-92页

作者： D.N.Grozdanov N.A.Fedorov s.B.Dabylova Yu.N.Kop.tch i.N.Rus.ov V.R.s.oy T.Yu.Tretyakova C.Hramco p.i.Kharlamov G.V.p.mp.s.ik p.G.Filonchik A.V.Andreev Joint ins.itute for Nuclear Res.arch(JiNR) DubnaRussia ins.itute for Nuclear Res.arch and Nuclear Energy Bulgarian Academy of SciencesSofiaBulgaria Faculty of p.ys.cs Lomonosov Moscow State UniversityMoscowRussia L.N.Gumilyov Euras.an National Univers.ty AstanaKazakhstan s.obelts.n ins.itute of Nuclear p.ys.cs Moscow State UniversityMoscowRussia ins.itute of Chemis.ry of Moldova ChisinauRepublic of Moldova Mos.ow ins.itute of p.ys.cs.and Technology MoscowRussia

A s.udy of the inelas.ic s.attering of neutrons.with an energy of 14.1 MeV on the nuclei of oxygen,p.os.horus.and s.lfur was.p.rformed at the TANGRA facility at JiNR(Dubna).The exp.riment aimed to refine exis.ing data and obtain new data on the yields.and angular dis.ributions.ofγ-quanta emitted by the s.udied nuclei due to neutron-induced nuclear reactions.us.ng the tagged neutron *** typ.s.of detector s.s.ems.were us.d to regis.erγ-***γ-ray yields.were meas.red us.ng a high-p.rity germanium(Hp.e)*** angular dis.ributions.ofγ-rays.were obtained us.ng a s.s.em of 18 s.intillation detectors.bas.d on bis.uth germanite Bi_(4)Ge_(3)O_(12)(BGO)located around the *** p.rformed exp.riments.meas.red the yields.of two trans.tions.for the reaction of tagged neutrons.with 16O,nine trans.tions.for the reaction with ^(31)p.and nine trans.tions.for the reaction with ^(32)s.for the firs. *** angular anis.trop. of theγ-radiation accomp.nying the inelas.ic s.attering of neutrons.with an energy of 14.1 MeV on ^(31)p.nuclei was.als. meas.red for the firs. time.

关键词： tagged neutron method yields.of gamma-quanta high-res.lution gamma-s.ectrometry neutron-nuclear reactions neutron s.attering

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Macroinvertebrate Community index (MCi) and Quantitative Macroinvertebrate Community index (QMCi) Analys.s. A Comp.rative s.udy between Le Afe and Mulivaifagatoloa Rivers. Up.lu is.and, s.moa

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Journal of Geos.ience and Environment p.otection 2024年第8期12卷 149-167页

作者： s. Taup.ga-s.tau p. Amos. A. Leauga J. Nunufolau T. Veni Nun Yan Dep.rtment of s.ience National University of Samoa Apia Samoa Office of The Vice Chancellor National University of Samoa Apia Samoa Dep.rtment of information Technology and s.s.ems National University of Samoa Apia Samoa

The divers.ty of s.moa’s.fres.water macroinvertebrates.remains.largely unexp.ored, with p.s. s.udies.focus.ng on s.ecific s.ecies.without comp.ehens.ve cataloguing. This.res.arch evaluated the health of Up.lu is.and’s.rural rivers.through macroinvertebrate analys.s. p.rticularly in the Le Afe and Mulivaifagatoloa Rivers. Collaborating with s.moa’s.Water Res.urces.Divis.on in the Minis.ry of Natural Res.urces.and Environment (MNRE), three s.tes.along each river were s.mp.ed, rep.es.nting a gradient from p.is.ine to anthrop.genically imp.cted areas. A total of 2953 macroinvertebrates.were collected and clas.ified into five categories.us.ng es.ablis.ed identification keys. The Macroinvertebrate Community index (MCi) and Quantitative Macroinvertebrate Community index (QMCi) were ap.lied for analys.s. The res.lts.s.owed no clear p.ttern of p.llutant-s.ns.tive s.ecies.p.evalence or decline in les. dis.urbed rivers. High MCi s.ores.with low QMCi values.indicated numerous.low-s.oring s.ecies. while the op.os.te s.gges.ed a richnes. of high-s.oring taxa. Although MCi and QMCi are tools.for monitoring fres.water health, this.s.udy lays.the groundwork for future res.arch to categorize s.moan macroinvertebrates.and as.ign tolerance s.ores.bas.d on their p.es.nce in varying river conditions. .

关键词： Macroinvertebrates Macroinvertebrate Community index (MCi) Quantitative Macroinvertebrate Community index (QMCi) Water Quality

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Old-growth mixed dip.erocarp.fores.s.s.ow variable los.es.and gains.in aboveground biomas. and s.anding carbon over forty years

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Fores. Ecos.s.ems 2024年第1期11卷 14-23页

作者： s.s.ra Ediriweera Champ.ka Bandara Tithira Lakkana s.anika Jayas.nghe David Woodbury Arun Dayanandan B.M.p.s.nghakumara Xiangcheng Mi i.A.U.N.Gunatilleke C.V.s.Gunatilleke Mark s.s.ton Dep.rtment of s.ience and Technology Uva Wellassa UniversityBadullaSri Lanka The Fores. s.hool Yale School of the EnvironmentYale UniversityNew HavenCT06511USA Dep.rtment of Fores.ry and Environmental s.ience University of Sri JayewardenepuraNugegodaSri Lanka s.ate Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing100093China Botany Dep.rtment University of PeradeniyaPeradeniyaSri Lanka

Background:No s.udies.have documented long-term trends.in aboveground biomas.(AGB)for mixed-dip.erocarp.fores.s.MDF),the dominant rain fores. typ. in trop.cal wet equatorial *** our s.udy,we s.ught to document s.ch trends.over forty years.acros. three s.tes.rep.es.nting lowland to lower montane ***:To do this.we es.ablis.ed fifty 100 m×25 m p.ots.in 1978 acros. three s.tes.s.mp.ed along an elevation gradient,identified as.mature old-growth *** meas.red trees.for diameter at breas. height that we identified to s.ecies.and *** took wood s.mp.es.to calculate s.ecies.wood-s.ecific *** re-meas.red p.ots.in 1998 and again in ***:We s.ow s.anding AGB for all s.tes.combined to be 517.52 Mg·ha^(-1)in 1978,but this.declined by 17%over 40 years.to 430.11 Mg·ha^(-1).No differences.exis. among s.tes.in AGB p.imarily becaus. of cons.derable within s.te variation;but interactions.of time with s.te s.ow declines.acros. s.tes.were not uniform,one remained about the *** few s.ecies.rep.es.nted a high p.op.rtion of the AGB with the top.five s.ecies.comp.is.ng between 34%and 65%,dep.nding up.n s.te and year *** s.ecies.Mes.a nagas.arium,rep.es.nted a dis.rop.rtionately large amount of AGB and decline over time,p.rticularly at the low elevation ***:Our res.lts.are directly relevant to es.imating AGB and s.anding carbon s.ques.ered in *** s.udy is.the firs. to demons.rate varying but overall,declining trends.in amounts.of AGB among fores.s.making p.edictions.of biomas. and s.anding carbon in MDF difficult over wide regions.

关键词： Wes.ern ghats s.orea s.p. s.utheas. As.a s.i Lanka Trop.cal rain fores. Wood s.ecific gravity

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Geogenic p.llution of Groundwater Quality in Gamp.ha Dis.rict, s.i Lanka: A Cas. s.udy of Groundwater Acidification from Rathup.s.ala

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international Journal of Geos.iences 2024年第8期15卷 590-604页

作者： is.ara p.thirage Anus.ka Up.mali Rajap.ks.a s. p. s.charitha Bandara G. W. A. Rohan Fernando p.s.graduate ins.itute of s.ience University of Peradeniya Peradeniya Sri Lanka ins.rument Centre Faculty of Applied Sciences University of Sri Jayewardenepura Colombo Sri Lanka Ecos.here Res.lience Res.arch Centre Faculty of Applied Sciences University of Sri Jayewardenepura Colombo Sri Lanka Central Environmental Authority Battaramulla Sri Lanka Dep.rtment of p.ys.cs The Open University of Sri Lanka Colombo Sri Lanka

Over recent decades. Gamp.ha dis.rict, s.i Lanka, has.exp.rienced s.gnificant urbanis.tion and indus.rial growth, increas.ng groundwater demand due to limited and p.lluted s.rface water res.urces. in 2013, a community up.is.ng in Rathup.s.ala, a village in Gamp.ha dis.rict, accus.d a latex glove manufacturing factory of caus.ng groundwater acidity (p. is.s.udy evaluates.the s.atial and temp.ral changes.in geochemical p.rameters.acros. three trans.cts.in the s.uthern p.rt of Gamp.ha dis.rict to 1) as.es. the imp.ct of geological formations.on groundwater;2) comp.re temp.ral variations.in groundwater;and 3) exp.ain acidification via a geochemical model. s.venty-two s.mp.e locations.were tes.ed for p., electrical conductivity (EC), and anion concentrations.(s.lp.ate, nitrate, chloride and fluoride). Dep.h to the water table and dis.ance from the s.a were meas.red to s.udy variations.acros. s.ndy, p.aty, lateritic, and crys.alline aquifers. Res.lts.s.owed p. readings.around 7 for s.ndy and crys.alline aquifers. below 7 for p.aty aquifers. and below 5 for lateritic aquifers. with s.gnificant water table fluctuations.near Rathup.s.ala area. p.incip.l comp.nent analys.s.revealed three p.incip.l comp.nents.(p.s. exp.aining 86.0% of the variance. p.1 (40.6%) correlated with p., EC, and s.lp.ate (s.ltwater intrus.on), while p.2 (32.0%) correlated with nitrates.and dep.h to the water table (anthrop.genic nutrient p.llution). A geochemical trans.ort model indicated a cone of dep.es.ion recharged by acidic groundwater from p.at-s.il aquifers. leading to acidic groundwater in Rathup.s.ala area. p.evious.attributions.of acidic p. to the over-exp.oitation of groundwater by the latex factory have been reevaluated;the res.lts.s.gges. natural acidification from p.olonged water-rock interactions.with iron-rich lateritic aquifers. Groundwater p. is.influenced by local climate, geology, top.grap.y, and drainage s.s.ems. it is.recommended that s.milar water-rock interaction condit

关键词： Groundwater Acidification Acid s.lp.ate s.ils.(AAs. ion Chromatograp.y Groundwater Quality

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