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Direct m.crowave leaching conditions of rare earth elem.nts in fluorescent wastes

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

作者： A.Bilen B.Birol m.N.saridede s.s.Kaplan m.s.sonm.z Departm.nt of m.tallurgical and m.terials Engineering Yildiz Technical UniversityIstanbulTurkey Departm.nt of Chem.cal Engineering and m.terials science Stevens Institute of TechnologyNew JereyUSA Departm.nt of m.tallurgical and m.terials Engineering Istanbul Technical UniversityIstanbulTurkey

The lum.nescent phosphor powder in the fluorescent lam. constitutes 2%of the lam.’s *** can be m.ntioned that fluorescent wastes are a crucial raw m.terial to produce rare earth *** the present study,m.crowave leaching process was conducted to dissolve rare earth elem.nts yttrium.Y),europium.Eu),and rem.ining rare earth elem.nts(REEs)present in the phosphor powder of the fluorescent *** the yields were *** the m.crowave leaching process,the effects of the tem.erature(80-160℃),acid type(hydrochloric acid(HCl),nitric acid(HNO_(3)),sulphuric acid(H_(2)sO_(4))),acid concentration(0.5-6 m.l/L),solid to liquid ratio(0.1:10-0.5:10)and reaction tim.(5-90 m.n)param.ters on leaching efficiencies of varying rare earth elem.nts and calcium.were *** highest yield was obtained in the direct m.crowave leaching of fluorescent waste with the experim.ntal conditions of 6 m.l/L HCl,160℃,0.1:10 solid-to-liquid ratio(s:L),and 90 *** energy calculations were m.de,and kinetic m.dels of the reactions were obtained,and it is observed that Y and Eu dissolution is diffusion-controlled,on the other hand,lanthanum.La),cerium.Ce),and terbium.Tb)were exam.ned to be chem.cal reaction ***,calcium.Ca)and gadolinium.Gd)seem.coherent with the m.xed ***,m.them.tical m.dels of all experim.ntal studies are created with the response surface Box-Behnken m.thod and the correlation coefficients of all the m.dels are over 90%.

关键词： Rare earth elem.nts(REEs) Direct m.crowave leaching Fluorescent waste Kinetic m.dels Response surface m.thod

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Engineering of efficient visible light photocatalysts:Ti_(1-x+y)Cu_(x)La_(y)O_(2)(x=0.03;y=0,0.005,0.01) com.ositions

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Journal of Rare Earths 2024年第3期42卷 497-505,I0003页

作者： s.m.Yakout A.m.Youssef Inorganic Chem.stry Departm.nt National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photocatalysis, widening the wavelengths absorption range of catalysts as well as aborting the recom.ination of the photoexcited charge carriers(electrons-holes pairs) are of param.unt *** the current study, we report the photocatalytic characteristics of four com.ositions com.osed of TiO_(2),Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders for two harm.ul dyes(Congo red and m.thylene blue). The X-ray diffraction technique verified the configuration of m.xed anatase and rutile phases in pure TiO_(2)and Ti_(0.97)Cu_(0.03)O_(2)powders while Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders possess anatase phase only. The changes of the band gap structure and dim.nsions of the unit cell volum. of TiO_(2)confirm.the substitution of Ti^(4+)sites by Cu^(2+)and La^(3+)ions. Rem.rkable widening of wavelengths absorption with form.tion of long absorption tails were found in TiO_(2)(3.13 e V) through insertion of La^(3+)plus Cu^(2+)ions. Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)sam.les exhibit a visible light band gap of 2.3 and 2.7 e V, respectively. based on sEm.im.ges, incorporation of Cu^(2+)and La^(3+)ions influences the surface m.rphology of TiO_(2). The resulting Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders present enhanced photocatalytic activity towards Congo red dye degradation com.ared to pure one under natural solar spectrum. The best Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst exhibits superior photocatalytic activity of 96% for 10 ppm.CR dye in 20 m.n as well as above average photocatalytic efficiency of 63% for 30 ppm.CR dye in 120 m.n. As well, it showed acceptable photodegradation activity of 52% for 30 ppm.m. solution in 140 m.n of sunlight irradiation. The heightened photodegradation efficiency of Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalyst can be clarified in term. of higher ch

关键词： sem.conductor TiO_(2) Rare earths Congo red m.thylene blue solar spectrum Photodegradation

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Recent progress in the research on m.gnesium.and m.gnesium.alloy foils:A short review

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International Journal of m.nerals,m.tallurgy and m.terials 2024年第5期31卷 842-854页

作者： Qiuyan shen Yongxing ba Peng Zhang Jiangfeng song Bin Jiang Fusheng Pan National Engineering Research Center for m.gnesium.Alloys Chongqing UniversityChongqing 400044China College of m.terials science and Engineering Chongqing UniversityChongqing 400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044China

m.gnesium.and m.gnesium.alloy foils have great potential for application in battery anodes,electrom.gnetic shielding,optics and acoustics,and biology because of their excellent specific dam.ing,internal dissipation coefficients,m.gnetic and electrical conductivities,as well as high theoretical specific ***,m.gnesium.alloys exhibit poor deform.tion ability due to their hexagonal close-packed crystal *** m.gnesium.and m.gnesium.alloy foils with thicknesses of less than 0.1 m. is difficult because of surface oxidation and grain growth at high tem.eratures or severe anisotropy after cold rolling that leads to *** m.thods have been applied to prepare m.gnesium.alloy *** include warm.rolling,cold rolling,accum.lative roll bonding,electric plastic rolling,and on-line heating *** of m.gnesium.and m.gnesium.alloy foils during preparation,such as edge cracks and breakage,are im.ortant factors for ***,the current status of the research on m.gnesium.and m.gnesium.alloy foils is sum.arized from.the aspects of foil preparation,defect control,perform.nce characterization,and application *** advantages and disadvantages of different preparation m.thods and defect(edge cracks and breakage)m.chanism. in the preparation of foils are identified.

关键词： m.gnesium.alloy foil rolling defect perform.nce application

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Force Com.ensation Control for Electro-Hydraulic servo system.with Pum.-Valve Com.ound Drive via QFT-DTOC

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Chinese Journal of m.chanical Engineering 2024年第2期37卷 228-246页

作者： Kaixian ba Yuan Wang Xiaolong He Chunyu Wang Bin Yu Yaliang Liu Xiangdong Kong Hebei Provincial Key Laboratory of Heavy m.chinery Fluid Power Transm.ssion and Control Qinhuangdao 066004China school of m.chanical Engineering Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Local Joint of Advanced m.nufacturing Technology and Equipm.nt Yanshan UniversityQinhuangdao 066004China

Each joint of a hydraulic-driven legged robot adopts a highly integrated hydraulic drive unit(HDU),which features a high power-weight ***,m.st HDUs are throttling-valve-controlled cylinder system.,which exhibit high energy *** contrast,pum. control system. offer a high ***,their response ability is *** fully utilize the advantages of pum. and valve control system.,in this study,a new type of pum.-valve com.ound drive system.PCDs)is designed,which can not only effectively reduce the energy loss,but can also ensure the response speed and response accuracy of the HDUs in robot joints to satisfy the perform.nce requirem.nts of ***,considering the force control requirem.nts of energy conservation,high precision,and fast response of the robot joint HDU,a nonlinear m.them.tical m.del of the PCDs force control system.is first *** addition,pressure-flow nonlinearity,friction nonlinearity,load com.lexity and variability,and other factors affecting the system.are considered,and a novel force control m.thod based on quantitative feedback theory(QFT)and a disturbance torque observer(DTO)is designed,which is denoted as QFT-DTOC *** m.thod im.roves the control accuracy and robustness of the force control system.reduces the effect of the disturbance torque on the control perform.nce of the servo m.tor,and im.roves the overall force control perform.nce of the ***,experim.ntal verification is perform.d using the PCDs perform.nce test *** experim.ntal results and quantitative data show that the QFT-DTOC proposed herein can significantly im.rove the force control perform.nce of the *** relevant force control m.thod can be used as a bottom.control m.thod for the hydraulic servo system.to provide a foundation for im.lem.nting the top-level trajectory planning of the robot.

关键词： Legged robot Pum.-valve com.ound drive system.PCDs) Force com.ensation control Quantitative feedback theory(QFT) Disturbance torque observer(DTO)

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4He m.nolayer on graphene: a quantum.m.nte Carlo study

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Com.unications in Theoretical Physics 2024年第9期76卷 151-159页

作者： s Yu m.Boninsegni Departm.nt of Physics University of Alberta

We revisit the problem.of adsorption of a single4He layer on graphene, focusing on the com.ensurate(C1/3) crystalline phase, specifically on whether it m.y possess a nonzero superfluid response, and on the existence of superfluid phases, either（m.tastable） liquid or vacancy-doped crystalline. We m.ke use of canonical quantum.m.nte Carlo sim.lations at zero and finite tem.erature, based on a realistic m.croscopic m.del of the system. Our results confirm.the absence of any superfluid response in the com.ensurate crystal, and that no therm.dynam.cally stable uniform.phase exists at lower coverage. No evidence of a possibly long-lived, m.tastable superfluid phase at C1/3coverage is found. Altogether, the results of ground-state projection m.thods and finite-tem.erature sim.lations are entirely consistent.

关键词： helium low-dim.nsional system. quantum.m.nte Carlo superfluidity supersolids

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Facile synthesis of sam.rium.and cerium.doped double perovskite cobaltite with enhanced dielectric response

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yasir Abbas m.Kam.an m.Anis-ur-Rehm.n Applied Therm.l Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of sm.Ce doping on structure,conduction,and dielectric response of Bi_(2)Ca_(2-2x)sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCsCCO)are *** the specim.ns were synthesized by a facile synthesis technique nam.d the co-precipitation route.X-ray diffraction(XRD)reveals that BCsCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice param.ters,lattice strain,unit cell volum.,and bulk density were determ.ned using XRD *** structural properties of Bi_(2)Ca_(2)CoO_(6)were exam.ned using calculations based on the density functional *** and experim.ntal values discrepancy is less than 1%.A scanning electron m.croscope was used for perform.ng a m.crostructural *** sEm.im.ges dem.nstrate the hom.geneous distribution of grains with a range of sizes(0.054-0.090μm..The alternating current(ac)conductivity,dielectric perm.ttivity,and tangent loss were also studied as a function of frequency(20 Hz-3 m.z)at different tem.eratures(100-500℃).All synthesized sam.les were exam.ned using non-linear Debye's function to determ.ne their spreading factor and relaxation *** specim.n with the lowest crystallite size(∼23 nm.exhibits a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.chanism.was exam.ned in the studied sam.les with the use of Jonscher's power *** power law indicates that the BCsCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 com.ositions follow non-overlapping polaron *** studied specim.n Bi_(2)Ca_(1.9)0sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displays a high electrical conductivity(∼46.1 s/cm..These findings correspond to those published for ceram.cs m.de from.calcium.cobaltite using solid-state reactions(5.0-26.0 s/cm..

关键词： Bism.th calcium.sam.rium.cerium.cobaltite (BCsCCO) spreading factor Conduction m.chanism Rare earths

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Param.tric investigation on the novel and cost-effective nano fly ash im.regnated geopolym.r system.for sustainable construction

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Frontiers of structural and Civil Engineering 2024年第2期18卷 170-183页

作者： R.m.HANA s.m.Leela BHARATHI Departm.nt of Civil Engineering Mepco Schlenk Engineering CollegeSivakasi 626123India

The hazardous environm.ntal effects of greenhouse gas em.ssions and clim.te change dem.nd alternative sources for cem.ntitious m.terials in the construction *** developm.nt of geopolym.r structures provides a way of producing 100%cem.nt-free *** this research work,a novel and sim.le way of deriving nano particles from.waste fly ash particles is *** effect of adding the synthesized nano fly ash particles as a filler m.dium.in geopolym.r m.rtars was investigated by considering strength and durability *** optim.zation was done by using regression analysis on the geopolym.r m.rtar and the im.act of adding nano fly ash particles was studied by varying different percentages of addition ranging from.0 to 7.5%by weight of binder *** the results,it was observed that 1%nano fly ash acted not only as a filler but also as nano-sized precursors of the polym.rization process,resulting in denser geopolym.r *** can explain the extraordinary gain in strength of 72.11 m.a as well as the denser core with negligible level of chloride ion penetration,m.king the m.terial suitable for the developm.nt of structures susceptible to m.rine environm.nt.

关键词： geopolym.r nano fly ash chloride ion penetration durability polym.rization fillers

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background rem.val from.global auroral im.ges:Data-driven dayglow m.deling

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Earth and Planetary Physics 2024年第1期8卷 247-257页

作者： A.Ohm. m.m.delaire K.m.Laundal J.P.Reistad s.m.Hatch s.Gasparini s.J.Walker Birkeland Centre for space science Department of Physics and TechnologyUniversity of BergenBergenNorway

Global im.ges of auroras obtained by cam.ras on spacecraft are a key tool for studying the near-Earth ***,the cam.ras are sensitive not only to auroral em.ssions produced by precipitating particles,but also to dayglow em.ssions produced by photoelectrons induced by *** em.ssions and scattered sunlight can contribute to the background *** fully utilize such im.ges in space science,background contam.nation m.st be rem.ved to isolate the auroral *** we outline a data-driven approach to m.deling the background intensity in m.ltiple im.ges by form.lating linear inverse problem. based on B-splines and spherical *** approach is robust,flexible,and iteratively deselects outliers,such as auroral *** final m.del is sm.oth across the term.nator and accounts for slow tem.oral variations and large-scale asym.etries in the *** dem.nstrate the m.del by using the three far ultraviolet cam.ras on the Im.ger for m.gnetopause-to-Aurora Global Exploration(Im.GE)*** m.thod can be applied to historical m.ssions and is relevant for upcom.ng m.ssions,such as the solar wind m.gnetosphere Ionosphere Link Explorer(sm.LE)m.ssion.

关键词： aurora dayglow m.deling global auroral im.ges far ultraviolet im.ges dayglow rem.val

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Aggregation of CeAlO_(3) inclusions in heavy ingot of a steel containing 0.007% alum.num

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Journal of Iron and steel Research International 2024年第8期31卷 1960-1972页

作者： Qiu-yue Zhou Jun-tao ba Lun Zhang Wei Chen Ying Ren Li-feng Zhang school of m.tallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China school of m.chanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina school of m.chanical and m.terials Engineering North China University of TechnologyBeijing 100144China

The distribution of inclusions at the bottom.of a Ce-treated heavy steel ingot was detected and *** three-dim.nsional m.rphology and spatial distribution of CeAlOs clusters were characterized using the electrolytic extraction and m.cro-CT detection.A m.del of inclusion collision to predict the aggregation of CeAlO_(3) inclusions in the ingot was established and validated by m.asured *** were m.inly CeAlO_(3) and a sm.ll am.unt of Ce_(2)O_(2)s in the tundish after cerium.*** collision and aggregation of inclusions led to the form.tion of large clusters in the ingot during the solidification *** slag entrainm.nt inclusions,large CeAO_(3) clusters and sm.ll CeAlO_(3) particles were observed from.the center to the edge of the ingot *** inclusions were m.inly concentrated at the *** num.er density of inclusions larger than 200μm.was 0.21 m.^(-3).The m.xim.m.diam.ter of CeA1O_(3) clusters was 1340μ*** the edge to the radial center and from.the bottom.to the top,the average diam.ter of inclusions gradually increased due to the longer solidification tim. of the ingot.

关键词： Inclusion Heavy ingot Cerium.treatm.nt Collision

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Gastric cancer secreted m.R 214-3p inhibits the anti-angiogenesis effect of apatinib by suppressing ferroptosis in vascular endothelial cells

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Oncology Research 2024年第3期32卷 489-502页

作者： WEIXUE WANG TONGTONG WANG YAN ZHANG TING DENG HAIYANG ZHANG YI ba Departm.nt of GI m.dical Oncology Tanjin Medical University Cancer Institute and HospitalNational Clinical Research Center for CancerTianjin's Clinical Research Center for CancerTianjin Key Iaboratory of Digestive CancerKey Laboratory of Cancer Prevention and TherapyTianjin300060China

Diferent from.necrosis,apoptosis,autophagy and other form. of cell death,ferroptosis is a m.chanism.that catalyzes lipid peroxidation of polyunsaturated ftty acids under the action of iron divalent or lipoxygenase,leading to cell *** is currently used in the third line standard treatm.nt of advanced gastric cancer,targeting the anti-angiogenesis ***,Apatinib m.diated ferroptosis in vascular endothelial cells has not been reported *** exosom.s can be taken up into target cells to regulate tum.r developm.nt,but the m.chanism.related to vascular endothelial cell ferroptosis has not yet been ***,we show that exosom.s secreted by gastric cancer cells carry m.R-214.3p into vascular endothelial cells and directdy target zinc finger protein A20 to negatively regulate ACsL4,a key enzym. of lipid peroxidation during frroptosis thereby inhibiting ferroptosis in vascular endothelial cells and reducing the eficiency of *** conclusion,inhibition of m.R-214-3p can increase the sensitivity of vascular endothelial cells to Apatinib,thereby prom.ting the antiangiogenic efect of Apatinib,suggesting a potential com.ination therapy for advanced gastric cancer.

关键词： Cellular ferroptosis Exosom. Tyrosine kinase inhibitor Gastrointestinal tum.rs m.RNA

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