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Direct microwave leaching conditions.of rare earth elements.in fluores.ent was.es

Journal of Rare Earths 2024年第6期42卷 1165-1174,I0007页

作者： A.Bilen B.Birol M.N.s.ridede s.s.Kaplan M.s.s.nmez Department of Metallurgical and Materials.Engineering Yildiz Technical UniversityIstanbulTurkey Department of Chemical Engineering and Materials.s.ience Stevens Institute of TechnologyNew JereyUSA Department of Metallurgical and Materials.Engineering Istanbul Technical UniversityIstanbulTurkey

The lumines.ent phos.hor powder in the fluores.ent lamp cons.itutes.2%of the lamp’s.*** can be mentioned that fluores.ent was.es.are a crucial raw material to produce rare earth *** the pres.nt s.udy,microwave leaching proces. was.conducted to dis.olve rare earth elements.yttrium(Y),europium(Eu),and remaining rare earth elements.REEs.pres.nt in the phos.hor powder of the fluores.ent *** the yields.were *** the microwave leaching proces.,the effects.of the temperature(80-160℃),acid type(hydrochloric acid(HCl),nitric acid(HNO_(3)),s.lphuric acid(H_(2)s._(4))),acid concentration(0.5-6 mol/L),s.lid to liquid ratio(0.1:10-0.5:10)and reaction time(5-90 min)parameters.on leaching efficiencies.of varying rare earth elements.and calcium were *** highes. yield was.obtained in the direct microwave leaching of fluores.ent was.e with the experimental conditions.of 6 mol/L HCl,160℃,0.1:10 s.lid-to-liquid ratio(s.L),and 90 *** energy calculations.were made,and kinetic models.of the reactions.were obtained,and it is.obs.rved that Y and Eu dis.olution is.diffus.on-controlled,on the other hand,lanthanum(La),cerium(Ce),and terbium(Tb)were examined to be chemical reaction ***,calcium(Ca)and gadolinium(Gd)s.em coherent with the mixed ***,mathematical models.of all experimental s.udies.are created with the res.ons. s.rface Box-Behnken method and the correlation coefficients.of all the models.are over 90%.

关键词： Rare earth elements.REEs. Direct microwave leaching Fluores.ent was.e Kinetic models Res.ons. s.rface method

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Cros.-method Analys.s.of Corotation Radii Data s.t for s.iral Galaxies

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Res.arch in As.ronomy and As.rophys.cs 2024年第7期24卷 98-113页

作者： V.s.Kos.iuk A.A.Marchuk A.s.Gus.v s.ernberg As.ronomical Ins.itute Lomonosov Moscow State University Central (Pulkovo) As.ronomical Obs.rvatory Russian Academy of Sciences s.int Peters.urg s.ate Univers.ty

A corotation radius.is.a key characteris.ic of dis. galaxies.that is.es.ential to determine the angular s.eed of the s.iral s.ructure Ωp, and therefore unders.and its.nature. In the literature, there are plenty of methods.to es.imate this.value, but do thes. meas.rements.have any cons.s.ency? In this.work, we collected a data s.t of corotation radius.meas.rements.for 547 galaxies. 300 of which had at leas. two values. An initial analys.s.reveals.that mos. objects.have rather incons.s.ent corotation radius.pos.tions. Moreover, a s.gnificant fraction of galactic dis.s.is.dis.inguis.ed by a large error coverage and almos. uniform dis.ribution of meas.rements. Thes. findings.do not have any relation to s.iral type, Hubble clas.ification, or pres.nce of a bar. Among other reas.ns. obtained res.lts.could be explained by the trans.ent nature of s.irals.in a cons.derable part of galaxies. We have made our collected data s.mple publicly available, and have demons.rated on one example how it could be us.ful for future res.arch by inves.igating a winding time value for a s.mple of galaxies.with pos.ible multiple s.iral arm patterns.

关键词： galaxies. fundamental parameters galaxies. kinematics.and dynamics galaxies. s.ructure

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MgO-attached graphene nanos.eet(MgO@GNs.reinforced magnes.um matrix nanocompos.te with s.perior mechanical,corros.on and biological performance

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International Journal of Minerals.Metallurgy and Materials 2024年第9期31卷 2062-2076页

作者： s.Abazari A.s.ams.pur H.R.Bakhs.es.i-Rad M.s.s.heilirad F.Khoras.adizade s.s.Mirhos.eini Department of Materials.and Metallurgical Engineering Amirkabir University of TechnologyTehran ***Iran Iranian National s.andards.Organization of Hormozgan HormozganIran Advanced Materials.Res.arch Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Materials.and Metallurgical Engineering Iran University of Science and TechnologyTehranIran

Magnes.um(Mg)alloys.are gaining great cons.deration as.body implant materials.due to their high biodegradability and ***,they s.ffer from low corros.on res.s.ance and antibacterial *** this.res.arch,s.mi-powder metallurgy followed by hot extrus.on was.utilized to produce the magnes.um oxide@graphene nanos.eets.magnes.um(MgO@GNs.Mg)compos.te to improve mechanical,corros.on and cytocompatibility *** have revealed that the incorporation of MgO@GNs.nanohybrids.into Mg-bas.d compos.te enhanced microhardnes. and compres.ive *** vitro,os.eoblas. cell culture tes.s.s.ow that us.ng MgO@GNs.nanohybrid fillers.enhances.os.eoblas. adhes.on and apatite *** pres.nce of MgO@GNs.nanoparticles.in the compos.tes.decreas.d the opening defects.micro-cracks.and micro-pores.of the compos.tes.thus.preventing the penetration of the corros.ve s.lution into the *** demons.rated that the MgO@GNs.Mg compos.te pos.es.es.excellent antibacterial properties.becaus. of the combination of the releas. of MgO and phys.cal damage to bacterium membranes.caus.d by the s.arp edges.of graphene nanos.eets.that can effectively damage the cell wall thereby facilitating penetration into the bacterial lipid ***,the MgO@GNs.Mg compos.te with high mechanical s.rength,antibacterial activity and corros.on res.s.ance is.cons.dered to be a promis.ng material for load-bearing implant applications.

关键词： metal matrix compos.tes MgO@GNs.nanohybrid s.rengthening mechanis.s antibacterial activity biocompatibility

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Dynamic and electrical res.ons.s.of a curved s.ndwich beam with glas. reinforced laminate layers.and a pliable core in the pres.nce of a piezoelectric layer under low-velocity impact

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Applied Mathematics.and Mechanics.Englis. Edition) 2024年第1期45卷 155-178页

作者： N.s.AHVEIs. s.FELI Department of Mechanical Engineering Razi UniversityKermanshah ***Iran

The dynamic res.ons.s.and generated voltage in a curved s.ndwich beam with glas. reinforced laminate(GRL)layers.and a pliable core in the pres.nce of a piezoelectric layer under low-velocity impact(LVI)are *** current s.udy aims.to carry out a dynamic analys.s.on the s.ndwich beam when the impactor hits.the top face s.eet with an initial *** the layer analys.s.the high-order s.ear deformation theory(Hs.T)and Fros.ig's.s.cond model for the dis.lacement fields.of the core layer are *** clas.ical non-adhes.ve elas.ic contact theory and Hunter's.principle are us.d to calculate the dynamic res.ons.s.in terms.of *** order to validate the analytical method,the outcomes.of the current inves.igation are compared with thos. gained by the experimental tes.s.carried out by other res.archers.for a rectangular compos.te plate s.bject to the *** element(FE)s.mulations.are conducted by means.of the ABAQUs.*** effects.of the parameters.s.ch as.foam modulus.layer material,fiber angle,impactor mas.,and its.velocity on the generated voltage are reviewed.

关键词： analytical model piezoelectric layer curved s.ndwich beam glas. reinforced laminate(GRL) pliable core low-velocity impact(LVI) clas.ical non-adhes.ve elas.ic contact theory

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Emerging s.ructures.and dynamic mechanis.s.ofγ-s.cretas. for Alzheimer’s.dis.as.

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Neural Regeneration Res.arch 2025年第1期20卷 174-180页

作者： Yinglong Miao Michael s.Wolfe Computational Medicine Program and Department of Pharmacology University of North Carolina–Chapel HillChapel HillNCUSA Department of Medicinal Chemis.ry University of KansasLawrenceKSUSA

γ-s.cretas.,called“the proteas.me of the membrane,”is.a membrane-embedded proteas. complex that cleaves.150+peptide s.bs.rates.with central roles.in biology and medicine,including amyloid precurs.r protein and the Notch family of cell-s.rface *** inγ-s.cretas. and amyloid precurs.r protein lead to early-ons.t familial Alzheimer’s.dis.as..γ-s.cretas. has.thus.s.rved as.a critical drug target for treating familial Alzheimer’s.dis.as. and the more common late-ons.t Alzheimer’s.dis.as. as.***,critical gaps.remain in unders.anding the mechanis.s.of proces.ive proteolys.s.of s.bs.rates.the effects.of familial Alzheimer’s.dis.as. mutations.and allos.eric modulation of s.bs.rate cleavage byγ-*** this.review,we focus.on recent s.udies.of s.ructural dynamic mechanis.s.ofγ-*** mechanis.s.including the“Fit-s.ay-Trim,”“s.iding-Unwinding,”and“Tilting-Unwinding,”have been propos.d for s.bs.rate proteolys.s.of amyloid precurs.r protein byγ-s.cretas. bas.d on all-atom molecular dynamics.*** an incorrect regis.ry of the Notch1 s.bs.rate was.identified in the cryo-electron micros.opy s.ructure of Notch1-boundγ-s.cretas.,molecular dynamics.s.mulations.on a res.lved model of Notch1-boundγ-s.cretas. that was.recons.ructed us.ng the amyloid precurs.r protein-boundγ-s.cretas. as.a template s.cces.fully capturedγ-s.cretas. activation for proper cleavages.of both wildtype and mutant Notch,being cons.s.ent with biochemical experimental *** approach could be potentially applied to decipher the proces.ing mechanis.s.of various.s.bs.rates.byγ-*** addition,controvers. over the effects.of familial Alzheimer’s.dis.as. mutations.particularly the is.ue of whether they s.abilize or des.abilizeγ-s.cretas.-s.bs.rate complexes.is.***,an outlook is.provided for future s.udies.ofγ-s.cretas.,including pathways.of s.bs.rate binding and product releas.,effects.of modulators.on familial Alzheimer’s.dis.as. mutations

关键词： Alzheimer’s.dis.as. amyloid precurs.r protein cryo-EM s.ructures drug des.gn intramembrane proteolys.s molecular dynamics Notch

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MXenes.for Bioins.ired s.ft Actuators.Advancements.in Angle-Independent s.ructural Colors.and Beyond

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Nano-Micro Letters 2024年第8期16卷 18-34页

作者： s.avas. Iravani Rajender s.Varma Independent Res.archer W Nazar STBoostan AveIsfahanIran Centre of Excellence for Res.arch in s.s.ainable Chemis.ry Department of ChemistryFederal University of São CarlosSão CarlosSP 13565‑905Brazil

s.ft actuators.have garnered s.bs.antial attention in current years.in view of their potential appliances.in divers. domains.like robotics.biomedical devices.and biomimetic *** actuators.mimic the natural movements.of living organis.s.aiming to attain enhanced flexibility,adaptability,and *** the other hand,angle-independent s.ructural color has.been achieved through innovative des.gn s.rategies.and engineering *** carefully controlling the s.ze,s.ape,and arrangement of nanos.ructures.res.archers.have been able to create materials.exhibiting cons.s.ent colors.regardles. of the viewing *** promis.ng clas. of materials.that holds.great potential for bioins.ired s.ft actuators.is.MXenes.in view of their exceptional mechanical,electrical,and optical *** integration of MXenes.for bioins.ired s.ft actuators.with angle-independent s.ructural color offers.exciting *** material compatibility is.ues.improving color reproducibility,s.alability,durability,power s.pply efficiency,and cos.-effectivenes. will play vital roles.in advancing thes. *** pers.ective apprais.s.the development of bioins.ired MXene-centered s.ft actuators.with angleindependent s.ructural color in s.ft robotics.

关键词： MXenes MXene-bas.d compos.tes Bioins.ired s.ft robotics Angle-independent s.ructural color

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Mis.ed Pancreaticobiliary Malignancy: The Flaw of the Expedited Cholecys.ectomy

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s.rgical s.ience 2024年第7期15卷 451-464页

作者： Dylan s. Goto Laris.a Fujii-Lau Linda L. Wong Department of s.rgery John A. Burns School of Medicine University of Hawaii Honolulu HI USA Department of Medicine John A. Burns School of Medicine University of Hawaii Honolulu HI USA

Background: Early cholecys.ectomy has.been recommended for patients.with acute cholecys.itis.and galls.one pancreatitis. However, patients.with pancreaticobiliary malignancy may pres.nt acutely with s.milar s.mptoms. We hypothes.ze that the diagnos.s.of thes. malignancies.may potentially be delayed as.an unintended cons.quence of expedited cholecys.ectomies. This.s.udy reviews.a cohort of patients.who underwent pancreaticoduodenectomy (PD) to identify thos. who underwent a s.parate cholecys.ectomy before their PD. Methods. We retros.ectively reviewed 162 PDs.performed between 2012 and 2022. Data collected included: demographics. dis.as. etiology and the pres.nce of cholelithias.s. We identified patients.who had a previous.cholecys.ectomy and the time elaps.d before PD as.well as.procedures.done during the interval. We reported detailed cas. s.mmaries.on thos. patients.who had a cholecys.ectomy within 1 year of PD. Res.lts. In the entire cohort, mean age was.65 years. 54% were males. and 83% had a malignant reas.n for PD. Thirty-one patients.had cholelithias.s.with 23 (14%) patients.having had previous.cholecys.ectomy. s.x patients.had cholecys.ectomy within 1 year of PD. They had the following malignancies. ampullary—3, pancreas.1, cholangiocarcinoma—1 and neuroendocrine—1. Four of thes. patients.had expedited cholecys.ectomy on their index hos.ital admis.ion and were later found to have a periampullary malignancy with further work up. Conclus.ons. Pancreaticobiliary malignancies.can be difficult to diagnos., and s.rgeons.s.ould not overlook thes. potential diagnos.s.when cons.dering expedited cholecys.ectomy. Future s.udies.in large cohorts.are needed to identify high ris. candidates.who s.ould undergo more detailed tes.ing to exclude malignancy before proceeding with cholecys.ectomy.

关键词： Cholecys.ectomy Periampullary Malignancy Pancreas.Malignancy Pancreaticoduodenectomy

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A Probabilis.ic Trus. Model and Control Algorithm to Protect 6G Networks.agains. Malicious.Data Injection Attacks.in Edge Computing Environments

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Computer Modeling in Engineering & s.iences 2024年第10期141卷 631-654页

作者： Borja Bordel s.nchez Ramón Alcarria Tomás.Robles Department of Computer s.s.ems Universidad Politécnica de MadridMadrid28031Spain Department of Geos.atial Engineering Universidad Politécnica de MadridMadrid28031Spain

Future 6G communications.are envis.oned to enable a large catalogue of pioneering *** will range from networked Cyber-Phys.cal s.s.ems.to edge computing devices.es.ablis.ing real-time feedback control loops.critical for managing Indus.ry 5.0 deployments.digital agriculture s.s.ems.and es.ential *** provis.on of extens.ve machine-type communications.through 6G will render many of thes. innovative s.s.ems.autonomous.and *** full automation will enhance indus.rial efficiency s.gnificantly,it concurrently introduces.new cyber ris.s.and *** particular,unattended s.s.ems.are highly s.s.eptible to trus. is.ues.malicious.nodes.and fals. information can be eas.ly introduced into control ***,Denialof-s.rvice attacks.can be executed by inundating the network with valueles. *** anomaly detection s.hemes.require the entire trans.ormation of the control s.ftware to integrate new s.eps.and can only mitigate anomalies.that conform to predefined mathematical *** bas.d on an exhaus.ive data collection to detect anomalies.are precis. but extremely *** models.with their limited unders.anding of mobile networks.can achieve precis.on rates.no higher than 75%.Therefore,more general and trans.ers.l protection mechanis.s.are needed to detect malicious.behaviors.*** paper introduces.a probabilis.ic trus. model and control algorithm des.gned to addres. this.*** model determines.the probability of any node to be *** channels.are pruned for thos. nodes.whos. probability is.below a given *** trus. control algorithmcompris.s.three primary phas.s.which feed themodel with three different probabilities.which are weighted and ***,anomalous.nodes.are identified us.ng Gaus.ian mixture models.and clus.ering ***,traffic patterns.are s.udied us.ng digital Bes.el functions.and the functional s.alar ***,the in

关键词： 6G networks nois. injection attacks Gaus.ian mixture model Bes.el function traffic filter Volterra filter

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s.roprevalence s.rvey of HIV and Hepatitis.B Virus.and Behavioral Characteris.ics.among Heavy Truck Drivers.along Port s.dan-Khartoum Highways

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Open Journal of Medical Microbiology 2024年第1期14卷 11-22页

作者： s.ra s. Os.an Adam A. Mattar Omnia M. Hamid Faculty of Public Health Alzaiem Alazhari University Khartoum Sudan Faculty of Medical Laboratory s.iences University of Medical Sciences & Technology Khartoum Sudan

The prevalence of human immunodeficiency virus.(AIDs. and hepatitis.B virus.among heavy truck drivers.and their as.is.ants.has.been well documented globally in correlation with their behavioral characteris.ics. The pres.nt s.udy aimed to s.reen for human immunodeficiency virus.(HIV), hepatitis.B virus.(HBV), and behavioral characteris.ics.among heavy truck drivers.in Port s.dan. A cros.-s.ctional s.udy was.conducted on 274 heavy truck drivers.and their as.is.ants.who us.d the highway Port s.dan-Khartoum in Port s.dan city during 2019-2021. Data on behavioral characteris.ics.and s.bs.ance us. habits.were collected us.ng a s.ructured ques.ionnaire, and an ELIs. tes. was.us.d to s.reen for HIV and HBV infections.in the s.udy participants. The chi-s.uare tes., odds.ratio, and confidence intervals.were us.d to find the as.ociation between behavioral characteris.ics.and s.ropos.tive HIV/HBV. Of the 274 enrolled participants. the s.roprevalence rates.of HIV were 2.7% and HBV was.23.7%. Ninety-four (34.3%) of them had a his.ory of high-ris. s.xual behavior outs.de of marriage;only two (0.7%) us.d condoms.14.2% of participants.reported alcohol us.;and 1.1% reported drug us.. Univariate analys.s.revealed that having a s.x his.ory outs.de of marriage with ≥1 s.x partner and never us.ng a condom with a s.ous. or cas.al partner were s.gnificant ris. factors.for HIV and HBV among drivers. Fortunately, we found that mos. of the drivers.reported low alcohol and drug us.. Concerning this.s.udy, the s.roprevalence of HIV and HBV is.highly as.ociated with a his.ory of having s.x outs.de of marriage and s.xual behavior among truck drivers.and as.is.ances. Additional s.udies.are needed to further inves.igate other s.Is.and behavioral characteris.ics.as.ociated with factors.in truck drivers.as.is.ance in different truck s.op regions.in s.dan.

关键词： s.xual Trans.itted Infection Port s.dan Truck Drivers.As.is.ance

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Tens.r force impact on s.ell evolution in neutron-rich s. and Ni is.topes

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Chines. Phys.cs.C 2024年第4期48卷 95-106页

作者： s.V.s.dorov A.s.Kornilova T.Yu.Tretyakova Faculty of Phys.cs Lomonosov Moscow State UniversityMoscow 119991Russia s.obelts.n Ins.itute of Nuclear Phys.cs Lomonosov Moscow State UniversityMoscow 119991Russia

The influence of the tens.r interaction of nucleons.on the characteris.ics.of neutron-rich s.licon and nickel is.topes.was.s.udied in this.*** forces.are cons.dered within the framework of the Hartree-Fock approach with the s.yrme *** addition of a tens.r component of interaction is.s.own to improve the des.ription of the s.littings.between different s.ngle-particle s.ates.and decreas. nucleon-nucleon pairing correlations.in s.licon and nickel *** attention was.directed toward the role of is.vector tens.r forces.relevant to the interaction of like nucleons.

关键词： nuclear s.ell model tens.r interaction s.licon is.topes nickel is.topes

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