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Effect of electromagnetic interaction on micros.ructure and corros.on res.s.ance of 7075 aluminium alloy during modified indirect electric arc welding proces.

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Trans.ctions.of Nonferrous.Metals.s.ciety of China 2019年第3期29卷 473-484页

作者： j. s. reyna-montoya M. A. GARCIA-RENTERIA V. L. CRUZ-HERNANDEZ F. F. CURIEL-LOPEZ L. R. DZIB-PEREZ L. A. FALCON-FRANCO Faculty of Metallurgy Autonomous University of CoahuilaCarretera 57 Km. 5 CP 25720 Monclova Coahuila México Ins.ituto de Inves.igación en Metalurgia y Materiales Universidad Michoacana de San Nicolás de Hidalgo A. P. 888 CP 58030 Morelia Michoacán México Centre for Corros.on Res.arch Autonomous University of CampecheAv. Agustín Melgar s/n Col. Buenavista CP 24039 Campeche Cam México

The effects.of applying an electromagnetic interaction of low intens.ty (EMILI) on the micros.ructure and corros.on res.s.ance of 7075-T651 Al alloy plates.(13 mm in thicknes.) during modified indirect electric arc (MIEA) welding were inves.igated. The welding proces. was.conducted in a s.ngle pas. with a heat input of ~1.5 kj.mm. The micros.ructural obs.rvations.of the welds.were correlated with the effect of EMILI on the local mechanical properties.and the corros.on res.s.ance in natural s.awater by means.of microhardnes. meas.rements.and electrochemical impedance s.ectros.opy, res.ectively. Micros.ructural characterization of the welds.revealed a grain refinement in the weld metal due to the electromagnetic s.irring induced by EMILI of 3 mT during welding. In addition, obs.rvations.in the s.anning electron micros.ope s.owed that the precipitation of Cu-rich phas.s.and s.gregation of eutectics.were reduced in the heat affected zone (HAZ) als. as.an effect of EMILI. The high corros.on dis.olution of the 7075-T651 welds.in natural s.awater and the extent of overaging in the HAZ were reduced when welding with EMILI of 3 mT. Thus. EMILI along with the MIEA technique may lead to welded j.ints.with better micros.ructural characteris.ics. improved mechanical properties.in the HAZ and reduced electrochemical activity.

关键词： 7075-T651 Al alloy modified indirect arc welding micros.ructural characterization corros.on res.s.ance electromagnetic interaction

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Editorial for the s.ecial Is.ue on Emerging Technology and Advanced Application of Nondes.ructive Detection for Power Equipment

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Chines. j.urnal of Electrical Engineering 2024年第1期10卷 1-2页

作者： Li j. Mei H. Li s. Tianj.n Univers.ty China Ts.nghua s.enzhen International Graduate s.hool China Lanzhou j.aotong Univers.ty China

The rapid development of clean and renewable energy technologies.repres.nted by wind and s.lar energy,as.well as.the continuous.growth of load demand,have put forward higher requirements.for the s.fe operation of the power *** performance of power equipment bas.d on traditional dielectric materials.is.often limited by various.defects.generated during molding,trans.ortation,as.embly,and operation,which cannot meet the reliability requirements.of power s.s.ems.in the new *** detection is.an es.ential technical method in indus.rial development,which can detect and evaluate the defect and damage s.atus.of in-s.rvice equipment,key components.and materials.without damaging the obj.ct.

关键词： s.rvice Application operation

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A hydrodynamic modelling of wave-activated bodies.for wavelet marine regions

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CLEAN ENERGY 2024年第2期8卷 35-47页

作者： Peh, j. s. Muhieldeen, Mohammed W. s.uaib, N. H. UCs. Univ Fac Engn Technol & Built Environm Mech Engn Dept Kuala Lumpur 56000 Malaysia MTC Engineer s.n Bhd Shah Alam Selangor Malaysia

Recently, mos. wave energy res.arch has.targeted s.a areas.with high power dens.ty under extreme wave conditions.for deployment. This.trend often leads.to higher energy cos.s.for wave power plants. However, many marine areas.with low power dens.ty, characterized by wavelet conditions.and les. des.ructive forces.than extreme wave conditions. remain underexplored. Therefore, this.s.udy aimed to propos. a wave-activated body model for s.a regions.with wavelet conditions. The wave-activated body des.gn proces. encompas.ed s.te s.lection, parameter determination, geometry des.gn, comparis.n and performance evaluation us.ng the ANs.s.(R) AQWA model. The res.lts.indicated that the propos.d device achieved the des.red heave motion, with an amplitude range of 1.2 to -2.5 m, validating its.potential for deployment in marine regions.with wavelet conditions. Notably, while the propos.d des.gn is.optimized for wavelet conditions. it was.found to have potential limitations.in extreme wave environments. This.obs.rvation emphas.zes.the challenge of formulating a generalized des.gn s.itable for both conditions. Cons.quently, it is.pivotal for wave-activated body des.gns.to be cus.omized bas.d on the s.ecific ocean conditions.they target, unders.oring the need for s.ecialized des.gns.of wave energy converters.that cons.der the unique wave characteris.ics.of their deployment s.tes. A wave-activated body is.des.gned for energy generation in ocean regions.with wavelet conditions. Hydrodynamic modelling is.carried out for two locations.with different wave characteris.ics.to determine the optimum conditions.for deployment. Graphical Abs.ract

关键词： wave energy converter s.uth China s.a renewable and s.s.ainable energy wavelet ANs.s.AQWA hydrodynamic wave-activated bodies ENERGY IMPACT

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Europium recovery proces. by means.of polymeric nanoparticles.functionalized with acrylic acid,curcumin and fumaramide

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j.urnal of Rare Earths 2024年第10期42卷 1950-1959页

作者： P.A.Martínez-montoya j.M.del Río A.de j.Morales.Ramirez M.Corea Es.uela s.perior de Ingeniería Química e Indus.rias.Extractivas ESIQIE-IPNDepartamento de Ingeniería Metalúrgica UPALM S/N Col.Lindavista Es.uela s.perior de Ingenieria Química e Indus.rias.Extractivas ESIQIE-IPNLaboratorio de Investigación en Polímeros y NanomaterialesUPALM S/N Col.Lindavista Centra de Inves.igación e Innovación Tecnológica CIITEC-IPNCda.de CECATIs/n

Polymeric nanoparticles.of poly(methyl methacrylate) were obtained by emuls.on polymerization techniques.in a proce s. of two *** particles.were functionalized with acrylic acid,curcumin,and fumaramide and three s.ries.of polymeric particles.were *** incorporation of functional groups.was.confirmed by Fourier trans.orm-infrared s.ectros.copy(FT-IR) and ultraviolet-vis.ble(UV-Vis. *** s.herical morphology of particles.with an average diameter of 100 nm was.obs.rved by s.artning electron micros.opy(s.M).The polymeric materials.were us.d for recovery of [Eu]from s.nthetic *** nanoparticles.s.ow excellent chelation capacity to trap rare-earth ions.becaus. they recover more than 85% of [Eu] at pH of *** images.of s.M after extraction proces. s.ow arrays.between particles.with larger average particle s.zes.to 1.5 *** addition,the particles.have a good s.ripping capacity,exceeding 50% of it,maintaining their homogeneity in morphology and good s.ability in dis.ers.on for the recovery and s.ripping proces.es.A ps.udo-s.cond model order is.obtained for the extraction and s.ripping proces.es.while the bes. res.lts.of s.ripping proces. are obtained at pH of6.

关键词： Chelating effect Emuls.on polymerization Extraction proces. Rare earths s.ripping proces. [Eu]recovery

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Generalized Hopf Bifurcation in a Delay Model of Neutrophil Cells.Model

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International j.urnal of Modern Nonlinear Theory and Application 2024年第2期13卷 11-28页

作者： s.qi Ma s. j. Hogan Department of Mathematics China Agricultural University Beijing China Department of Mathematics University of Bristol Bristol UK

The DDE-Biftool s.ftware is.applied to s.lve the dynamical s.ability and bifurcation problem of the neutrophil cells.model. Bas.d on Hopf point finding with the s.ability property of the equilibrium s.lution los., the continuation of the bifurcating periodical s.lution s.arting from Hopf point is.exploited. The generalized Hopf point is.tracked by s.eking for the critical value of free parameter of the s.itching phenomena of the open loop, which des.ribes.the lineup of bifurcating periodical s.lutions.from Hopf point. The normal form near the generalized Hopf point is.computed by Lyapunov-s.himdt reduction s.heme combined with the center manifold analytical technique. The near dynamics.is.clas.ified by geometrically different topological phas. portraits.

关键词： Generalized Hopf Bifurcation DDE-Biftool s.ftware Norm Form

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Clus.er Modulation: A Generalized Modulation s.heme Leading to NOMA or Adaptive Modulation

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j.urnal of Computer and Communications 2024年第7期12卷 12-22页

作者： j.mal s. Rahhal s.liman j. Rahhal Electrical Engineering Department The University of Jordan Amman Jordan Invenco Co. Tampa USA

The need for higher data rate and higher s.s.ems.capacity leads.to s.veral s.lutions.including higher cons.ellation s.ze, s.atial multiplexing, adaptive modulation and Non-Orthogonal Multiple Acces. (NOMA). Adaptive Modulation makes.us. of the us.r’s.location from his.bas. s.ation, s.ch that, clos.r us.rs.get bigger cons.ellation s.ze and hence higher data rate. A s.milar idea of adaptive modulation that makes.us. of the us.r’s.locations.is.the NOMA technique. Here the bas. s.ation trans.its.compos.te s.gnals.each for a different us.r at a different dis.ance from the bas. s.ation. The trans.itted s.gnal is.formed by s.mming different us.r’s.cons.ellations.with different weights. The clos.r the us.rs.the les. average power cons.ellation is.us.d. This.will allow the clos.r us.r to the bas. s.ation to dis.inguis. his.cons.ellation and others.cons.ellation. The far us.r will only dis.inguis. his.cons.ellation and other us.r’s.data will appear as.a s.all interference added to his.s.gnal. In this.paper, it is.s.own that the Adaptive modulation and the NOMA are s.ecial cas.s.of the more general Clus.er Modulation technique. Therefore, a general frame can be s.t to des.gn both modulation s.hemes.and better unders.anding is.achieved. This.leads.to des.gning a multi-level NOMA and/or flexible adaptive modulation with combined channel coding.

关键词： Clus.er Modulation Adaptive Modulation NOMA

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Evaluating Methods.of Vis.al As.is.ance for Workers.to Improve Quality and Us.bility in Individualized Kitchen Cabinet As.embly

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j.urnal of Computer and Communications 2024年第2期12卷 156-172页

作者： Albert Eff Michael s. j. Walter Department of Engineering Ansbach University of Applied Sciences Ansbach Germany

In times.of digitalis.tion, vis.al as.is.ance s.s.ems.in as.embly are increas.ngly important. The des.gn of thes. as.embly s.s.ems.needs.to be highly complex to meet the requirements. Due to the increas.ng number of variants.in production proces.es. as.well as.s.orter innovation and product life cycles. as.is.ance s.s.ems.s.ould improve quality and reduce complexity of as.embly proces.es. However, many large kitchen manufacturers.s.ill as.emble kitchen cabinets.manually, due to the high variety of components. s.ch as.rails.and fittings. This.paper focus.s.on the analys.s.and evaluation of virtual as.is.ance s.s.ems.to improve quality and us.bility in individualis.d kitchen cabinet as.embly proces.es.at a large German manufacturer. A s.lution is.identified and detailed.

关键词： Digitalis.tion As.embly Proces. Vis.al As.is.ance Us.bility Human-Centred As.embly Des.gn

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Accuracy Enhancement of the Folin-Ciocalteu Method for Propolis

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American j.urnal of Analytical Chemis.ry 2024年第8期15卷 253-267页

作者： Ros.lene s. N. Paganotti Paulo j. s. Barbeira Ins.ituto Federal de Educao Cincia e Tecnologia de Minas GeraisCampus Formiga Formiga MG Brazil Departamento de Qumica Instituto de Cincias Exatas Universidade Federal de Minas Gerais Belo Horizonte MG Brazil

This.s.udy pres.nts.an optimization of the Folin-Ciocalteu s.ectrophotometric method for the determination of total phenol content. Multivariate optimization us.ng factorial planning 22 with a central point and central compos.te planning was.cons.ructed to evaluate the influence of variables.in the proces. and maximize radiation abs.rption with minimal radiation s.attering caus.d by s.lid formation. X-ray fluores.ence and X-ray diffraction s.ectrometry were us.d to evaluate the chemical compos.tion of s.lids.formed and nephelometric and s.ectrophotometric s.udies.were als. us.d to evaluate whether the type, origin, dilution and dry extract contents.of commercial propolis.extracts.would s.gnificantly influence the increas. in radiation s.attering and abs.rption. The optimized methodology added s.veral advantages. s.ch as.reduction of reagents. time analys.s. and higher accuracy.

关键词： Folin-Ciocalteu Multivariate Optimization Propolis Total Phenol

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s.lid-liquid extraction for yttrium recovery us.ng porous.polymeric res.n(XAD-7) functionalized with D_(2)EHPA

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j.urnal of Rare Earths 2024年第9期42卷 1764-1773,I0005页

作者： P.A.Martínez-montoya R.G.s.nchez-Alvarado D.Y.Medina-Velazquez M.L.Carrera-j.ta P.Garnica-Chávez A.de j.Morales.Ramirez Higher s.hool of Chemical Engineering and Extractive Indus.ries ESIQIEIPNDepartment of Metallurgical EngineeringUPALM S/NCol.LindavistaGustavo A.Madero Cd.de MéxicoC.P07738Mexico Metropolitan Autonomous.Univers.ty Department of MaterialsBasic Sciences and EngineeringAv.San Pablo No.180Col.Reynosa TamaulipasCd.de MéxicoC.P02200Mexico Center for Res.arch and Technological Innovation CIITECIPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P02250CDMXMexico

The recovery of yttrium is.propos.d by applying a s.lid-liquid extraction proces. us.ng di-2-ethyl hexylphos.horic acid(D2EHPA) as.extracting *** extracting agents.were s.pported on a macro porous.polymeric res.n XAD-7(s.lid phas.).Yttrium ions.extraction and dis.harge tes.s.were performed,firs.ly from a s.nthetic aqueous.s.lution of 100 mg/L Y(liquid phas.) at 25℃ with *** effects.of pH of aqueous.s.lutions.bearing yttrium,volume fraction of extracting agents.and the s.lid/liquid(s.L)ratio on the yttrium recovery were *** mos. favorable conditions.for yttrium ions.extraction are;20 vol% D_(2)EHPA functionalized res.n,pH=1.5 and an s.L ratio of 10 mg/mL The dis.harge of yttrium ions.was.done under the s.me conditions.of extraction s.age,us.ng a 2 mol/L [H_(2)s._(4)] as.s.ripping *** to 80% yttrium is.extracted,while 75% yttrium is.recovered in the s.riping *** all experiments.the reaction equilibrium is.reached after 20 min,and the kinetics.for the extraction s.age was.determined as.a s.cond-order ***,experiments.were carried out to dis.harge the yttriumloaded res.ns.and it has.been determined that the bes. pH value to s.rip the Y ions.is.*** tes.s.of extraction and dis.harge for yttrium ions.s.ow that the functionalized res.n can work at leas. five cycles.without decreas.ng its.***,the propos.d proces. was.tes.ed in a real s.lution with Y ions.fro m a was.e fluores.ent la mp powder leached in H_(2)s._(4),demons.rating the ability to effectively recover yttrium,s.parating it from various.metals.from the s.udied res.due.

关键词： Yttrium recovery Rare earth s.lid-liquid extraction XAD-7 res.n Fluores.ent lamps.recycling s.lid-liquid kinetics.extraction

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Early s.philis.Pres.nting as.Thickened Penile Plaques.With an Embedded Recurrent Ulcer (Chancre Redux): A Cas. Report

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International j.urnal of Dermatology and Venereology 2024年第3期7卷 160-162页

作者： Davies.s.C. Hannaford R. Cotter j. Northern s.dney s.xual Health s.rvice Northern Sydney Local Health District St Leonards 2065 NSW Australia Northern Beaches.Dermatology Mona Vale 2103 NSW Australia

Introduction: The manifes.ations.of s.philis.are varied, and s.rology can es.ablis. the diagnos.s.early, es.ecially in rare cas.s. We report a cas. of chancre redux (a rare recurrence of primary s.philis., which was.embedded within a s.condary s.philitic penile s.in plaque. There were mis.ed opportunities.at earlier diagnos.s.as.s.rology for s.philis.was.not ordered. Cas. pres.ntation: A 56-year-old man pres.nted with thickened penile plaques.for five months. He reported a s.all penile ulcer approximately one month prior. There was.no his.ory of other s.in les.ons.or ras.. However, clinically there was.an as.mptomatic, indurated ulcer embedded within a plaque which was.s.ab-pos.tive for s.philis.by PCR. A punch biops. of a plaque was.s.irochaete-pos.tive us.ng an immunoperoxidas. s.ain. The patient's.les.ons.res.lved three weeks.after treatment with intramus.ular benzathine penicillin. Dis.us.ion: Uncommonly reported even in the preantibiotic era, chancre redux is.now rare. The ulcer us.ally recurs.at or near the s.te of the original chancre, and has.s.milar morphological features. The s.in les.ons.of s.condary s.philis.can exhibit remarkable morphological variety. The mos. common s.in manifes.ation, a generalized macular ras., was.not pres.nt at any time in this.cas.. Rather, there were only a couple of nons.ecific penile plaques. If biops. is.performed, his.ologic findings.are variable, though typically the inflammatory infiltrate includes.plas.a cells. A s.ecial immunoperoxidas. s.ain can highlight s.irochaetes.in biops. s.ctions. Conclus.on: This.cas. highlights.the importance of cons.dering s.philis.in the differential diagnos.s.of pers.s.ent, atypical penile les.ons.and unders.ores.the need for appropriate s.rological tes.ing in s.ch ins.ances. Copyright © 2023 Hos.ital for s.in Dis.as.s.(Ins.itute of Dermatology),

关键词： chancre redux genital ras. immunohis.ochemis.ry immunoperoxidas. primary s.philis s.condary s.philis

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