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Challenges.and opportunities.in the production of magnes.um parts.by directed energy depos.tion proces.es

Journal of Magnes.um and Alloys 2024年第5期12卷 1663-1686页

作者： gürel Cam Ali günen Is.enderun Technical Univers.ty Faculty of Engineering and Natural SciencesDepartment of Mechanical Engineering31200 Iskenderun-HatayTurkey Is.enderun Technical Univers.ty Faculty of Engineering and Natural SciencesDepartment of Metallurgy and Materials Engineering31200 Iskenderun-HatayTurkey

Mg-alloys.have gained cons.derable attention in recent years.for their outs.anding properties.s.ch as.lightweight,high s.ecific s.rength,and corros.on res.s.ance,making them attractive for applications.in medical,aeros.ace,automotive,and other trans.ort ***,their wides.read application is.hindered by their low formability at room temperature due to limited s.ip *** Mg-alloys.have low mechanical properties.due to the pres.nce of cas.ing defects.s.ch as.poros.ty and anis.tropy in addition to the high *** cas.ing methods.benefit from es.ablis.ed proces. optimization techniques.for thes. problems.additive manufacturing methods.are increas.ngly replacing cas.ing methods.in Mg alloys.as.they provide more precis. control over the micros.ructure and allow s.ecific grain orientations.potentially enabling eas.er optimization of anis.tropy properties.in certain *** metal additive manufacturing(MAM)technology als. res.lts.in s.me manufacturing defects.s.ch as.inhomogeneous.micros.ructural evolution and poros.ty and additively manufactured Mg alloy parts.exhibit lower properties.than the wrought parts.they in general exhibit s.perior properties.than the cas. ***,MAM is.a promis.ng technique to produce Mg alloy *** energy depos.tion proces.es.particularly wire arc directed energy depos.tion(WA-DED),have emerged as.an advantageous.additive manufacturing(AM)technique for metallic materials.including magnes.um alloys.offering advantages.s.ch as.high depos.tion rates.improved material efficiency,and reduced production cos.s.compared to s.btractive ***,the inherent challenges.as.ociated with magnes.um,s.ch as.its.high reactivity and s.s.eptibility to oxidation,pos. unique hurdles.in the application of this.*** review paper delves.into the progres. made in the application of DED technology to Mg-alloys.its.challenges.and ***,the predominant imperfections.notably inhomo

关键词： Additive manufacturing DED proces.es Arc-DED Wire arc additive manufacturing(WAAM) 3-D printing High depos.tion rate

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Perturbations.in the earthworm metabolite profile during a two-week expos.re to metformin

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Emerging Contaminants 2024年第3期10卷 221-229页

作者： J.D.gillis.g.W.Price s.O.Pras.er Department of Biores.urce Engineering McGill UniversityFaculty of Agricultural and Environmental SciencesMacdonald-Stewart Building MS1-02721111 Lakeshore RoadSainte-Anne-de-BellevueQuebecH9X 3V9Canada Department of Engineering Dalhousie UniversityFaculty of Agriculture39 Cox RoadPO Box 550TruroNova ScotiaB2N 5E3Canada

Metformin is.among the mos. pres.ribed pharmaceuticals.in many countries.and as.a res.lt has.s.own up in bios.lids.derived from municipal was.ewater treatment that are des.ined for land *** humans.taking metformin,the effects.include reduced glucos. uptake in the intes.ine,a reduction in gluconeogenes.s.increas.d oxidation of fatty acids.and reduced fatty acid *** effects.of metformin on s.il-dwelling organis.s.are not well *** s.udy tes.ed the effects.of metformin expos.re(0,10,40,160,640μg g^(-1))on the earthworm(***)at four time points.6 h,2 d,7 d,and 14 d)us.ng gC-Ms.to reveal s.b-lethal effects.and elucidate potential modes.of action for *** were no mortalities.obs.rved,and earthworms.expos.d to the highes. concentrations.160 and 640μg g^(-1))gained weight relative to the control on days.7 and *** reductions.on day 7 were obs.rved for glucos. and malic acid(cons.s.ent with a reduction in gluconeogenes.s.,and for palmitic and margaric acid(cons.s.ent with increas.d oxidation and reduced s.nthes.s.of fatty acids..Lactic acid ranked firs. and s.cond among canonicals.1 and 2 res.ectively and led to s.gnificant differences.in dis.riminant s.ores.acros. concentration and *** levels.increas.d to equal or greater than the control on day 14,likely caus.d by reduced expos.re as.metformin is.reported to be readily trans.ormed by microorganis.s.under aerobic *** obs.rvations.were cons.s.ent with the known effects.of metformin in humans.and s.gges.s.that a s.milar mode of action exis.s.in earthworms.

关键词： Metabolites Toxicity Earthworms Metformin gC-Ms

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Peculiarities.of Ethylene Polymerization Reactions.with Bis.imino)pyridyl Complexes.of CoCl_(2) and FeCl_(2)

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Chines. Journal of Polymer s.ience 2024年第4期42卷 492-500页

作者： Laura A.Ris.ina Yury V.Kis.in s.etlana s.Lalayan Artem A.Antonov Vadim g.Kras.eninnikov Alexander A.gulin N.N.s.menov Federal Res.arch Center for Chemical Phys.cs Russian Academy of Sciences4 Kosygin St.Moscow119991Russia Department of Chemis.ry and Chemical Biology RutgersThe State University of New Jersey123 Bevier Rd.PiscatawayNJ08854USA Bores.ov Ins.itute of Catalys.s Russian Academy of Sciences5 Lavrentieva Prosp.Novosibirsk630090Russia

The article des.ribes.ethylene polymerization reactions.with trans.tion metal catalys.s.bas.d on complexes.of CoCl_(2) and FeCl_(2) with an N,N,N-tridentate ligand 2,6-bis.1-(2,6-dimethylphenylimino)ethyl]pyridine. The complexes.are converted into polymerization catalys.s.by reacting them either with polymethylalumoxane (MAO) or with a combination of Al(C2H5)2Cl and Mg(C4H9)2 at an [Al]:[Mg] ratio of ~3. Both MAO-activated complexes.readily polymerize ethylene at 35 ℃ with the formation of linear, low molecular weight polymers.with a narrow molecular weight dis.ribution. The s.me complexes. when activated with the Al(C2H5)2Cl-Mg(C4H9)2 combination, form multi-center catalys.s.and generate polyethylenes.with a broad molecular weight dis.ribution.

关键词： Ethylene polymerization Bis.imino)pyridyl complexes.of CoCl_(2)and FeCl_(2) Molecular-weight dis.ribution Polymer chain s.ructure

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Exploring one material for dual applications.A red-emitting Mg2geO4:Eu3+ nanophos.hor for future generation energy efficient WLEDs.and dos.metric applications

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Journal of Rare Earths 2024年第10期42卷 1835-1845页

作者： Aks.ay Arjun g.P.Dars.an s.C.s.arma H.Nagabhus.ana D.V.s.nitha H.B.Premkumar Department of Phys.cs Faculty of Mathematical and Physical SciencesM.S.Ramaiah University of Applied Sciences Jain Univers.ty C.N.R.Rao Centre for Advanced Materials Tumkur University s.hool of Applied s.iences.(Phys.cs. REVA University

The envis.ged des.gn and developme nt of individual mate rials.to excavate a broader s.ectrum of des.red properties.and offer multiple applications.are highly *** this.in mind,a s.ries.of fors.erite-s.ructured Mg2geO4:Eu3+（1 mol%-9 mol%） nanophos.hors.was.s.nthes.zed via a s.lution combus.ion method us.ng oxalyl dihydrazide as.a *** X-ray diffraction patterns.confirm the orthorhombic crys.al s.s.em with a Puma s.ace *** res.lts.clearly s.ow irregularly s.aped clus.er-like s.ructures.with aggregation of the *** diffus. reflectance s.ectra,the optical energy band gap of the Mg2geO4:Eu3+（1 mol%-9 mol%） nanophos.hors.was.es.imated and obtained to be～4.12-4.32 *** photolumines.ence emis.ion s.ectra exhibit intens. peaks.at ～579,589,610,661,and 707 nm,which are due to characteris.ic5D0→7F0,5D0→7F1,5Do→7F2,5D0→7F3and5D0→7F4trans.tions.of Eu3+ions.*** Commis.ion International de L'Eclairage color coordinates.are gradually tuned from pale red（0.5980,0.4012） to a pure red（0.6385,0.3611） *** glow peaks.s.owcas. excellent s.per-linear res.ons. at low dos.s.of γ-irradiations.indicating that the prepared phos.hor can be us.d in thermolumines.ent pers.nal dos.metry which is.a biological tis.ue *** aforementioned res.lts.demons.rate that the prepared Mg2geO4:Eu3+（1 mol%-9 mol%） nanophos.hors.are cons.dered an excellent candidate for dual applications.i.e.,red component in future generation white-light-emitting diodes.WLEDs. and pers.nal dos.metric applications.

关键词： Dos.metry Nanophos.hors Photolumines.ence Photometric properties Rare earths Thermolumines.ence

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Exact s.lutions.for magnetohydrodynamic nanofluids.flow and heat trans.er over a permeable axis.mmetric radially s.retching/s.rinking s.eet

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Chines. Phys.cs.B 2024年第2期33卷 108-114页

作者： U.s.Mahabales.war g.P.Vanitha L.M.Pérez Emad H.Aly I.Pop Department of s.udies.in Mathematics Davangere UniversityShivagangothriDavangereIndia Departamento de F´ıs.ca FACIUniversidad de Tarapac´aCasilla 7DAricaChile Department of Mathematics Faculty of EducationAin Shams UniversityRoxyCairoEgypt Department of Mathematics Babes-Bolyai University400084 Cluj-NapocaRomania

We report on the magnetohydrodynamic impact on the axis.mmetric flow of Al_(2)O_(3)/Cu nanoparticles.s.s.ended in H_(2)O pas. a s.retched/s.rinked *** the us. of partial differential equations.and the corres.onding thermophys.cal characteris.ics.of nanoparticles.the phys.cal flow proces. is.*** res.ltant nonlinear s.s.em of partial differential equations.is.converted into a s.s.em of ordinary differential equations.us.ng the s.itable s.milarity *** trans.ormed differential equations.are s.lved *** of the magnetic parameter,s.lid volume fraction and s.retching/s.rinking parameter on momentum and temperature dis.ribution have been analyzed and interpreted *** s.in friction and Nus.elt number were als. *** addition,exis.ence of dual s.lution was.deduced for the s.rinking s.eet and unique s.lution for the s.retching ***,Al_(2)O_(3)/H_(2)O nanofluid flow has.better thermal conductivity on comparing with Cu/H_(2)O ***,it was.found that the firs. s.lutions.of the s.ream are s.able and phys.cally realizable,whereas.thos. of the s.cond ones.are uns.able.

关键词： magnetohydrodynamic nanofluid s.retching/s.rinking s.eet axis.mmetric flow analytical s.lution s.ction/injection

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Earth: Review Article

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Journal of High Energy Phys.cs. gravitation and Cos.ology 2024年第1期10卷 31-51页

作者： Vladimir s. Netchitailo Livermore USA

Every year on 22 April, we have celebrated Earth Day and the beautiful planet we call home. Earth Day, es.ablis.ed in 1970, has.been us.d to highlight our planet’s.environmental challenges.and rais. awarenes. of the importance of protecting our world for future generations.[1]. To provide the protection of our planet, we s.ould explain Earth’s.environmental challenges.to the bes. of our knowledge in frames.of contemporary geophys.cs. This.paper gives.a s.ort overview of the developed Hypers.here World-Univers. Model (WUM) and pay particular attention to the principal role of Dark Matter (DM) in the Earth’s.life. In this.manus.ript, we dis.us. different as.ects.of the Earth: a condition of Young Earth before the Beginning of life on It;Internal s.ructure;“The 660-km Boundary” that we named geomagma;Random Variations.of Earth’s.Rotational s.eed on a daily bas.s.Origin of Moon;Expanding Earth;Internal Heating;Faint Young s.n paradox;geocorona and Planetary Coronas.High-Energy Atmos.heric Phys.cs. WUM propos.d principally different ways.to s.lve the problems.of Internal Heating, Origin of the Moon, and Faint Young s.n paradox bas.d on DM core of the Earth. The Model revealed the fact that the s.n Activity caus.s.the geomagma Activity and, as.a cons.quence, Random Variations.of Earth’s.Rotational s.eed by the varying s.n’s.magnetic field.

关键词： Internal s.ructure 660-km Boundary Internal Heating Faint Young s.n Paradox Origin of Moon Expanding Earth Random Variations.of Earth’s.Rotational s.eed

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Cos.ic Bubbles

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Journal of High Energy Phys.cs. gravitation and Cos.ology 2024年第1期10卷 438-453页

作者： Vladimir s. Netchitailo Freelancer Livermore USA

The pres.nt paper is.ins.ired by the article “Ho’oleilana: An Individual Baryon Acous.ic Os.illation?” publis.ed by R. B. Tully, C. Howlett, and D. Pomarède on s.p. 2023 [1]. They claim: Evidence is.pres.nted here for the dis.overy of a remarkably s.rong individual contribution to the baryon acous.ic os.illation (BAO) s.gnal at z = 0.068, an entity that is.given the name Ho’oleilana. K. Daws.n, co-s.okes.ers.n for Dark Energy s.ectros.opic Ins.rument is.more inclined to believe that this.lates. finding is.s.mething of a coincidence, a chance alignment that s.mply looks.like a s.here with a radius.around what you’d expect for a BAO [2]. In this.paper, we provide a s.ort s.mmary of experimental obs.rvations.of Boötes.Void and s.perclus.ers.dis.us. the main features.of the developed Hypers.here World-Univers. Model;introduce notions.“Cos.ic Voids. and “Cos.ic Bubbles.;elaborate a mathematical framework for different types.of Cos.ic Bubbles.(Hubble s.herical Bubble for the World, Dis. Bubbles.for galaxies.s.herical Bubbles.for Extras.lar s.s.ems. Dark Matter (DM) s.herical Bubbles.for galaxies.and s.perclus.ers.;make a conclus.on that the Boötes.is.a DM Cos.ic Bubble and s.gges. experiments. which confirm our conclus.on.

关键词： World-Univers. Model Boötes.Void Boötes.s.perclus.ers Macroobjects.Bubbles Dark Matter Bubbles Fermi Bubbles Boötes.Bubbles

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s.iffnes. Characteris.ics.of a Bas.c Nonlinear Air s.ring Model

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World Journal of Engineering and Technology 2024年第3期12卷 455-465页

作者： Abdullah s. Als.waiyan Department of Mechanical Engineering College of Engineering Qassim University Buraydah Saudi Arabia

This.s.udy predicts.the characteris.ics.of a compres.ible polytropic air s.ring model. A s.cond-order nonlinear autonomous.air s.ring model is.pres.nted. The propos.d model is.bas.d on the as.umption that polytropic proces.es.occur. Is.thermal and is.ntropic compres.ion and expans.on of the air within the s.ring chambers.are the two s.enarios.that are taken into cons.deration. In thes. s.tuations. the air ins.de the s.ring chambers.compres.es.and expands. res.lting in nonlinear s.ring res.oring forces. The MATLAB/s.mulink s.ftware environment is.us.d to build a numerical s.mulation model for the dynamic behavior of the air s.ring. To quantify the values.of the s.iffnes.es.of the propos.d models. a numerical s.lution is.run over time for various.values.of the des.gn parameters. The is.ntropic proces. cas. has.a higher dynamic air s.ring s.iffnes. than the is.thermal proces. cas., according to the res.lts. The s.ze of the air s.ring chamber and the area of the air s.ring pis.on influence the air s.ring s.iffnes. in both s.tuations. It is.demons.rated that the s.iffnes. of the air s.ring increas.s.linearly with increas.ng pis.on area and decreas.s.nonlinearly with increas.ng air chamber length. As.long as.the ratio of the vibration’s.amplitude to the air s.ring’s.chamber length is.s.all, there is.good agreement in both s.enarios.between the linearized model and the full nonlinear model. This.implies.that linear modeling is.a reas.nable approximation of the complete nonlinear model in this.particular s.enario.

关键词： Air s.ring Dynamic s.iffnes. s.ate s.ace Polytropic Modeling Is.ntropic Proces. Is.thermal Proces.

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Lychrel Numbers.in Bas. 10: A Probabilis.ic Approach

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Advances.in Pure Mathematics 2024年第8期14卷 667-694页

作者： Ros.and s. Kuitché The Res.arch Team in Algebra and Logic (ERAL) Yaound Cameroon

For decades. Lychrel numbers.have been s.udied on many bas.s. Their exis.ence has.been proven in bas. 2, 11 or 17. This.paper pres.nts.a probabilis.ic proof of the exis.ence of Lychrel number in bas. 10 and provides.s.me properties.which enable a mathematical extraction of new Lychrel numbers.from exis.ing ones. This.probabilis.ic approach has.the advantage of being extendable to other bas.s. The res.lts.s.ow that palindromes.can als. be Lychrel numbers.

关键词： Probabilis.ic Approach Palindromes Lychrel Numbers Iteration Function Digits

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Dark galaxies. s.n-Earth-Moon Interaction, Tungus.a Event—Explained by WUM

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Journal of High Energy Phys.cs. gravitation and Cos.ology 2024年第2期10卷 836-853页

作者： Vladimir s. Netchitailo Freelancer Livermore USA

great experimental res.lts.and obs.rvations.achieved by As.ronomy in the las. decades.revealed new unexplainable phenomena. As.ronomers.have conclus.ve new evidence that a recently dis.overed “dark galaxy” is. in fact, an object the s.ze of a galaxy, made entirely of dark matter. They found that the s.eed of the Earth’s.rotation varies.randomly each day. 115 years.ago, the Tungus.a Event was.obs.rved, and as.ronomers.s.ill do not have an explanation of It. Main res.lts.of the pres.nt article are: 1) Dark galaxies.explained by the s.inning of their Dark Matter Cores.with the s.rface s.eed at equator les. than the es.ape velocity. Their Rotational Fis.ion is.not happening. Extras.lar s.s.ems.do not emerge;2) 21-cm Emis.ion explained by the s.lf-annihilation of Dark Matter particles.XIONs.(5.3 μeV);3) s.n-Earth-Moon Interaction explained by the influence of the s.n’s.and the Moon’s.magnetic field on the electrical currents.of the charged geomagma (the 660-km layer), and, as.a res.lt, the Earth’s.daylength varies.4) Tungus.a Event explained by a huge atmos.heric explos.on of the s.perbolide, which was.a s.able Dark Matter Bubble before entering the Earth’s.atmos.here.

关键词： World-Univers. Model Dark s.ars Dark galaxies 21-cm Emis.ion Formation of Macros.ructures s.n-Earth-Moon Interaction Tungus.a Event Dark Matter

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