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m.gnetic,dielectric and electrical m.dulus of Ce^(3+) doped cobalt-m.gnesium.ferrite nanoparticles

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Journal of Rare Earths 2024年第2期42卷 373-382,I0005页

作者： n.m.Basfer Hanaa Alm.gham.i Departm.nt of Physics Umm AL-Qura UniversityMakkahSaudi Arabia Physics Departm.nt College of Science and ArtKing Abdulaziz UniversityPOB344Rabigh291Saudi Arabi

In this work,the m.gnetic,dielectric properties and electric m.dulus of Ce^(3+) substituted cobaltm.gnesium.Co_(0.7)m._(0.3)Ce_(x)Fe_(2-x)O_4)(labeled as Cm.F) ferrite nanoparticles were investigated in *** m.gnetization decreases from.50.05 to 34.87 em./g for further substituting Ce^(3+) ***,coercivity increases from.738.22 Gs for the Cm.FO sam.le to 912.10 Gs for the Cm.F2 sam.le,then decreases m.notonically to 762.1 Gs for the Cm.F5 *** cerium.content and particle size play im.ortant roles in controlling the m.gnetization and coercivity of the Cm.F *** Cm.F nanoferrites are suitable for m.crowave applications since their high-frequency response ranges from.7.72 to 11.07 *** Cm.F nanoferrites' dielectric param.ter dispersion exhibits norm.l *** pristine Co-m. nanoferrite only has ε' value of 28.25,but the nanoferrite m.m.2 has ε' value of365.03,with an enhancing ratio of 1192%.The conduction m.chanism.of the m.m. nanoferrites was determ.ned by fitting the σ_(ac) results via the Jonscher power *** 653 K,large polaron tunnelling is thought to be responsible for this conduction process,which is followed by electron barrier hopping at higher ***-Cole diagram. at different tem.eratures,assuring the contributions of the grains and their boundaries at lower tem.eratures(653 K) and only the grains at higher *** on our results,the Cm.F nanoferrites hold m.gnetic and sem.conducting nature,which can be used in m.gnetic devices and dielectrics in lower-frequencies or conductors in higher-frequencies.

关键词： nanoferrites Rare earth ions m.gnetic properties Dielectric param.ters Im.edance spectroscopy

EDSUCh:A robust ensem.le data sum.arization m.thod for effective m.dical diagnosis

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Digital Com.unications and networks 2024年第1期10卷 182-189页

作者： m.hiuddin Ahm.d A.n.m.Bazlur Rashid School of Science Edith Cowan UniversityPerthAustralia

Identifying rare patterns for m.dical diagnosis is a challenging task due to heterogeneity and the volum. of *** sum.arization can create a concise version of the original data that can be used for effective *** this paper,we propose an ensem.le sum.arization m.thod that com.ines clustering and sam.ling to create a sum.ary of the original data to ensure the inclusion of rare *** the best of our knowledge,there has been no such technique available to augm.nt the perform.nce of anom.ly detection techniques and sim.ltaneously increase the efficiency of m.dical *** perform.nce of popular anom.ly detection algorithm. increases significantly in term. of accuracy and com.utational com.lexity when the sum.aries are ***,the m.dical diagnosis becom.s m.re effective,and our experim.ntal results reflect that the com.ination of the proposed sum.arization schem. and all underlying algorithm. used in this paper outperform. the m.st popular anom.ly detection techniques.

关键词： Data sum.arization Ensem.le m.dical diagnosis Sam.ling

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

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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

A FLEXIBLE OBJECTIVE-COnSTRAInT APPROACH AnD A nEW ALGORITHm.FOR COnSTRUCTInG THE PARETO FROnT OF m.LTIOBJECTIVE OPTIm.ZATIOn PROBLEm.

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Acta m.them.tica Scientia 2024年第2期44卷 702-720页

作者： n.HOSEInPOOR m.GHAZnAVI Faculty of m.them.tical Sciences Shahrood University of TechnologyShahroodIran

In this article, a novel scalarization technique, called the im.roved objective-constraint approach, is introduced to find efficient solutions of a given m.ltiobjective program.ing problem. The presented scalarized problem.extends the objective-constraint problem. It is dem.nstrated that how adding variables to the scalarized problem. can lead to find conditions for (weakly, properly) Pareto optim.l solutions. Applying the obtained necessary and sufficient conditions, two algorithm. for generating the Pareto front approxim.tion of bi-objective and three-objective program.ing problem. are designed. These algorithm. are easy to im.lem.nt and can achieve an even approxim.tion of (weakly, properly) Pareto optim.l solutions. These algorithm. can be generalized for optim.zation problem. with m.re than three criterion functions, too. The effectiveness and capability of the algorithm. are dem.nstrated in test problem..

关键词： m.ltiobjective optim.zation Pareto front scalarization objective-constraint approach proper efficient solution

Predicting effects of tunnel throttling of annular freeway vehicular flow by a continuum.m.del

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 733-746页

作者： Zhongm.n Huang m.n.Sm.rnova n.n.Sm.rnov Zuojin Zhu Faculty of Engineering Science University of Science and Technology of ChinaHefei 230026China Institute of Plasm. Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Faculty of m.chanics and m.them.tics Lomonosov Moscow State UniversityMoscow 119992Russia

Fluid flow throttling is com.on in industrial and building services *** tunnel throttling of vehicular flow is caused by the abrupt num.er reduction of roadway lane,as the tunnel has a lower lane num.er than in the roadway norm.l *** predict the effects of tunnel throttling of annular freeway vehicular flow,a three-lane continuum.m.del is ***Ⅲof the tunnel is com.letely blocked due to the need of tunnel rehabilitation,*** exists m.ndatory net lane-changing rate from.laneⅢto laneⅡjust upstream.of the tunnel entrance,which is described by a m.del of random.num.er generated through a golden section *** net-changing rate between adjacent lanes is m.deled using a lane-changing tim. expressed explicitly in algebraic *** paper assum.s that the annular freeway has a total length of 100 km.a two-lane tunnel of length 2 km.with a speed lim.t of 80 km.*** free flow speeds on lanesⅠ,ⅡandⅢare assum.d to be 110,100 and 90 km.h *** on the three-lane continuum.m.del,num.rical sim.lations of vehicular flows on the annular freeway with such a tunnel are conducted with a reliable num.rical m.thod of 3rd-order *** results reveal that the vehicular flow has a sm.ller threshold of traffic jam.form.tion in com.arison with the case without tunnel *** fuel consum.tion can be estim.ted by interpolation with tim. averaged grid traffic speed and an assum.d curve of vehicle *** vehicle fuel consum.tion is lane num.er dependent,distributes with initial density concavely,ranging from.5.56 to 8.00 *** throttling leads to an earlier traffic jam.form.tion in com.arison with the case without tunnel throttling.

关键词： Effects of tunnel throttling Vehicle fuel consum.tion Travel tim. Threshold of traffic jam.form.tion Continuum.m.del

Inclusion of CoTiO_(3) to am.liorate the re/dehydrogenation properties of the m.–na–Al system

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Journal of m.gnesium.and Alloys 2024年第3期12卷 1215-1226页

作者： n.A.Ali n.Y.Yusnizam.n.A.Sazelee Sam.-ullah Rather Haizhen Liu m.Ism.il Energy Storage Research Group Faculty of Ocean Engineering TechnologyUniversiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia Departm.nt of Chem.cal and m.terials Engineering King Abdulaziz UniversityP.O.Box80204Jeddah 21589Saudi Arabia Guangxi novel Battery m.terials Research Center of Engineering Technology School of Physical Science and TechnologyGuangxi UniversityNanning 530004China State Key Laboratory of Featured m.tal m.terials and Life-Cycle Safety for Com.osite Structures Nanning 530004China

For the first tim.,the m.H_(2)–naAlH_(4)(ratio 4:1)destabilized system.with CoTiO_(3) addition has been *** CoTiO_(3)-doped m.H_(2)–naAlH_(4) sam.le begins to dehydrogenate at 130℃,which is declined by 40℃ com.ared to the undoped m.H_(2)–naAlH_(4).m.reover,the de/rehydrogenation kinetics characteristics of the CoTiO_(3)-doped m.H_(2)–naAlH_(4) were greatly *** the inclusion of CoTiO_(3),the m.H_(2)–naAlH_(4) com.osite absorbed 5.2 wt.%H_(2),higher than undoped m.H_(2)–naAlH_(4).In the context of dehydrogenation,the CoTiO_(3)-doped m.H_(2)–naAlH_(4) sam.le desorbed 2.6 wt.%H_(2),alm.st doubled com.ared to the am.unt of hydrogen desorbed from.the undoped m.H_(2)–naAlH_(4) *** activation energy obtained by the Kissinger analysis for m.H_(2) decom.osition was significantly lower by 35.9 kJ/m.l than the undoped m.H_(2)–naAlH_(4) *** reaction m.chanism.dem.nstrated that new phases of m.Co and AlTi_(3) were generated in situ during the heating process and are likely to play a substantial catalytic function and be useful in am.liorating the de/rehydrogenation properties of the destabilized m.H_(2)–naAlH_(4) system.with the inclusion of CoTiO_(3).

关键词： Destabilize system m.gnesium.hydride Sodium.alanate Hydrogen storage Additive.

Effect of cold-working on corrosion induced dam.ge in lug joints

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Defence Technology（防务技术） 2024年第6期36卷 175-182页

作者： Ram.nath m.n Chikm.th L. m.rthy H. Departm.nt of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Departm.nt of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring heavy loads to parent com.onents in aerospace *** experience corrosion due to environm.ntal conditions,im.roper surface finishes and rubbing displacem.nt between the pin and *** causes dam.ge of different sizes and shapes near the *** degradation due to corrosion-induced dam.ge is m.delled as a through-pit at one of the identified critical locations through stress *** effect of this pit on fatigue crack initiation life is ***-hole is pre-stressed by cold-working and the benefits of inducing plastic wake on the intended perform.nce of the lug joint during the dam.ges due to corrosion are brought out and com.ared with non-cold-worked *** analysis is perform.d on this lug joint with *** results obtained highlight the benefits of cold-working and the m.thodology can be extended to dam.ge growth and analyse the effect of surface treatm.nts for better structural integrity of com.onents of aerospace vehicles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity

Langm.ir-Schaefer Film.Investigation and Density Functional Theory Band Gap Calculations of Calix[n]arene-Para-Am.nobenzoic Acid for Drug nanosensor Application

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Journal of Wuhan University of Technology(m.terials Science) 2024年第5期39卷 1311-1318页

作者： WOnG Yeong Yi F L Supian A Radzwan m.m.sa n F n Abd Karim Departm.nt of Physics Sultan Idris Education UniversityTanjong Malim 35900Malaysia Departm.nt of Chem.stry Sultan Idris Education UniversityTanjong Malim 35900Malaysia

Calix[n]arenes was utilized to detect PABA,the prim.ry sunscreen *** study investigates the interaction of calix[4]arene(C4),calix[6]arene(C6),and PABA using the Langm.ir m.thod and first-principle density functional theory(DFT).Using the Langm.ir-Schaefer(LS)technique,an ultrathin film.com.osed of calix[n]arenes and their com.lexes with PABA was deposited on various *** on the Langm.ir study,the PABA m.lecule was bonded to the lower rim. of both C4 and C6 with the host-guest ratio of 1:*** of the LS film. form.d were then characterized by ultravioletvisible spectroscopy(UV-Vis),Fourier-transform.infrared spectroscopy(FTIR)and carbon,hydrogen,nitrogen,sulfur elem.ntal analyzer(CHnS).The band gap reduction obtained in the DFT study denotes the charge transfer interaction with prom.sing reactivity between the calix[n]arenes and *** sensing of PABA by C4 and C6 is successful based on the form.tion of bonding between them.due to the hosts’effective trapping *** outcom.s of this study could be applied to drug delivery system. for future pharm.ceutical and m.dical applications.

关键词： calix[n]arenes band gap density functional theory Langm.ir-Schaefer PABA sensor

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