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Determina.ion of Different Tra.e Hea.y Meta.s in Children’s Pla.tic Toys Imported to the West Ba.k/Pa.estine by ICP/MS-Environmenta. a.d Hea.th a.pects

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Journa. of Environmenta. Protection 2014年第12期5卷 1104-1110页

作者： Muta. a.-qutob ahmad a.a.ra.Tha.wa. Na.ha.hibi ahmad a. qutob Depa.tment of Ea.th a.d Environmenta. Studies Faculty of Science and Technology Al-Quds University Jerusalem a.ua.ic a.d a.ua.ulture Resea.ch La.ora.ory Al-Quds University Jerusalem Depa.tment of Electronic Engineering Faculty of Engineering Al-Quds University Jerusalem

The ma.n a.m of this study is to a.sess the qua.ity of inexpensive pla.tic toys imported to Pa.estinia. Ma.kets. The content of hea.y meta.s (Pb, Cd, Cr, Hg, a., Se, Ba. a.d Zn) wa. a.a.yzed in 50 pla.tic toys purcha.ed from loca. ma.kets in Pa.estine a.d 17 pla.tic toys purcha.ed from Isra.li ma.kets for compa.ison. a.ter the digestion of sa.ples with concentra.ed nitric a.ids a.d hydrogen peroxide using a.microwa.e digester, the concentra.ions of the selected hea.y meta.s were determined by ICP-MS a.ilent 7500 in a.-Quds University. Results revea.ed tha. 40% of the Pa.estinia. toy sa.ples ha. high concentra.ion (a.ove interna.iona. limits) of Pb, 30% of Cd, 34% of Cr, 6% of Hg, 42% of a., 32% of Se, 20% of Ba. a.d 40% of Zn. On the other ha.d, 95% of the Isra.li sa.ples were sa.e, a.d their concentra.ions were less tha. the ma.imum interna.iona.ly a.lowa.le limits. In the sa.e context, ten toy sa.ples (2.5 gm ea.h) ha. been crushed a.d dipped for 8 hours in a.solution of a.tificia. sa.iva. The solution wa. a.idified a.d tested for hea.y meta. concentra.ions, but none of the migra.ion concentra.ions exceeded the interna.iona. ma.imum a.lowa.le limit. High levels of hea.y meta. concentra.ions, found in the pla.tic toys from the Pa.estinia. ma.kets could form a.hea.th ha.a.d to children a.d put their lives a. risk. It could be a.so a. indirect source for environmenta. pollution.

关键词： Pla.tic Toys Hea.y Meta.s Content Pa.estinia. Ma.kets Isra.li Ma.kets

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Production of Spirulina.pla.ensis Using Inexpensive Loca. Resources in Pa.estine

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Journa. of Environmenta. Protection 2024年第3期15卷 357-377页

作者： Ima. a.-Ja.a.i ahmad qutob Ma.moud a.kha.ib Muta. qutob Depa.tment of Environment a.d Ea.th Studies Al-Quds University Jerusalem Palestine Depa.tment of Electrica. Engineering Faculty of Engineering Al-Quds University Jerusalem Palestine Depa.tment of Chemistry a.d Chemica. Technology Al-Quds University Jerusalem Palestine

Spirulina.pla.ensis is a.specia. a.d unique cya.oba.teria.tha. is produced worldwide with a.va.ied cost of cultiva.ion media. In this study, five ma.n experiments with different trea.ments were performed to eva.ua.e the possibility of using chea. a.ua.ulture wa.er for Spirulina.production, to test if solutions ma.e by pla.t a.h (Pa.) could be used for Spirulina.production, to determine if bra.kish wa.er (BW) a.d mining wa.er ha.e a.good impa.t on Spirulina.production, to crea.e a.medium composed of chea. chemica.s a.d fertilizers to be used for Spirulina.cultiva.ion, a.d to test if a.mixture ma.e from loca. components could be used to produce Spirulina. a.l experiments were performed via.growth a.d dry weight mea.urements, including determina.ion of chemica. a.d physica. cha.a.teristics of the sa.ples with a.compa.ison with Za.rouk medium (ZM) a. a.reference for ea.h experiment, a.d a.l experiments were performed for 21 da.s to determine the best media.type tha. la.ts longer for commercia. purposes. In a.l experiments, pH va.ues were between 8 a.d 11, a.d EC wa. between 9.8 a.d 30 ms/cm, while tempera.ure wa. a. 30°C a.d 35°C, a.d light wa. a. 1500 a.d 5000 Lux for 16 h light a.d 8 h da.k. Spirulina.ca. grow in (FW). It ca. a.so grow in FW diluted with BW. a.so a.3% Pa. ca. be used a. a.source to cultiva.e Spirulina.a. a.very low price compa.ed to ZM. The chemica. fertilizer formula.wa. one of the best types a.ong a.l trea.ments with a.good price. a.mixture of these loca. resources could be a.very good chea. a.terna.ive source. The ma.n result tha. wa. obta.ned from a.l experiments in this study is the a.ility of Spirulina.to grow within a.wide ra.ge of chemica. pa.a.eters a. a.lower price.

关键词： Spirulina.pla.ensis Tila.ia Bra.kish Wa.er Za.rouk Medium

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Rota.ing effects on the thermophysica. properties of a.two-dimensiona. Ga.s qua.tum ring

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Communica.ions in Theoretica. Physics 2024年第6期76卷 165-173页

作者： ahmad Gha.ba.i Depa.tment of Physics College of ScienceYasouj UniversityYasoujIran

In this work,we ha.e investiga.ed the rota.ing effect on the thermodyna.ic properties of a.2D qua.tum ***,we ha.e considered the ra.ia. potentia. of a.2D qua.tum ring a.d solved the Schrödinger equa.ion in the presence of the a.a.onov-Bohm effect a.d a.uniform ma.netic field for the considered *** to the solution of the equa.ion,we ca.cula.ed the eigenva.ues a.d eigenfunctions of the considered *** the ca.cula.ed energy spectrum,we obta.ned the pa.tition function a.d thermodyna.ic properties of the system,such a. the mea. energy,specific hea.,entropy a.d free *** results show tha. the rota.ing effect ha. a.significa.t influence on the thermophysica. properties of a.2D qua.tum *** a.so study other effects of the rota.ing term:(1)the effect of different va.ues of rota.ing pa.a.eters,a.d(2)the effect of nega.ive rota.ion on the thermodyna.ic properties of the *** results a.e discussed in deta.l.

关键词： Schrodinger equa.ion qua.tum ring rota.ion effect thermophysica. properties

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Finite element model upda.ing for structura. da.a.e detection using tra.smissibility da.a

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Ea.thqua.e Engineering a.d Engineering Vibra.ion 2024年第1期23卷 87-101页

作者： ahmad Iza.i a.ba. Esfa.dia.i Depa.tment of Ma.itime Engineering Amirkabir University of TechnologyTehran 15875-4413Iran

This pa.er presents a.new finite element model upda.ing method for estima.ing structura. pa.a.eters a.d detecting structura. da.a.e loca.ion a.d severity ba.ed on the structura. responses(output-only da.a..The method uses the sensitivity rela.ion of tra.smissibility da.a.through a.lea.t-squa.es a.gorithm a.d a.propria.e norma.iza.ion of the extra.ted *** proposed tra.smissibility-ba.ed sensitivity equa.ion produces a.more significa.t number of equa.ions tha. the sensitivity equa.ions ba.ed on the frequency response function(FRF),which ca. estima.e the structura. pa.a.eters with higher *** a.ilities of the proposed method a.e a.sessed by using numerica. da.a.of a.two-story two-ba. fra.e model a.d a.pla.e structure *** eva.ua.ing different da.a.e ca.es,the number,loca.ion,a.d stiffness reduction of the da.a.ed elements a.d the severity of the simula.ed da.a.e ha.e been a.cura.ely *** relia.ility a.d sta.ility of the presented method a.a.nst mea.urement a.d modeling errors a.e exa.ined using error-conta.ina.ed *** pa.a.eter estima.ion results prove the method’s ca.a.ilities a. a. a.cura.e model upda.ing a.gorithm.

关键词： da.a.e detection model upda.ing output-only tra.smissibility sensitivity equa.ion

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Correla.ion between structura. pha.e tra.sition a.d physica. properties of Co^(2+)/Gd^(3+)co-substituted copper ferrite

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Journa. of Ra.e Ea.ths 2024年第7期42卷 1344-1353,I0006页

作者： Mohsen Choupa.i ahmad Gholiza.eh School of Physics Damghan UniversityDamghan36716-45667Iran

The doping of the spinel ferrites with selective ca.ions usua.ly improves the properties of the pa.ent *** effect of Co^(2+)/Gd^(3+)co-substitution on the microstructure,optica.,a.d ma.netic properties of Cu1-xCoxFe2-xGdxO4 prepa.ed by the citra.e-nitra.e a.to-combustion synthesis wa. *** of the sa.ples wa. performed with powder X-ra. diffra.tion(XRD),Ra.a. a.d Fouriertra.sform infra.ed(FTIR)spectroscopy,field-emission sca.ning electron microscopy,X-ra. energydispersive spectroscopy,UV-Vis spectroscopy,a.d a.vibra.ing sa.ple *** results of XRD,Ra.a.,a.d FTIR a.a.ysis show a.gra.ua. structura. pha.e tra.sition from a.tetra.ona.(I41/a.d)structure to a.cubic(Fd3m)*** ba.dga. energy of the studied sa.ples is in a.ra.ge of 1.57-1.75 eV with a.minimum in sa.ple x=0.06 a.d then *** investiga.ions show tha. the presence of Co^(2+)/Gd^(3+)ca.ions in a. octa.edra. site of the copper ferrite structure could increa.e sa.ura.ion ma.netiza.ion a.d coercive field from 567.9 Oe a.d 23.62 emu/g to 929.4 Oe a.d 28.27 emu/g,respectively.

关键词： Spinel copper ferrite Citra.e-nitra.e method Structure pha.e tra.sition Microstructure properties Ma.netic properties Ra.e ea.ths

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Eva.ua.ion of soil loss severity a.d ecologica. restora.ion a.proa.h for susta.na.le a.riculture in the Hindu Kush, Ka.a.ora. a.d Hima.a.a.region

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Journa. of Mounta.n Science 2024年第5期21卷 1509-1521页

作者： a.sha. a.HRa. Imra. ahmad Clima.e Energy and Water Research InstituteNational Agricultural Research Centre(NARC)Islamabad 44000Pakistan

Soil erosion ha. resulted in remova. of the topsoils conta.ning fine soil pa.ticles a.d pla.t nutrients, ca.sing decrea.e in soil fertility in the Hindu Kush, Ka.a.ora. a.d Hima.a.a.HKH) region. The existing production of cerea. crop gra.ns ha. been reduced to one third of the potentia. crop gra.ns production owing to la.d degra.a.ion a.d poor fa.ming pra.tices. It is necessa.y to a.sess risk of soil loss a.d identify a.propria.e controlling mea.ures to a.dress issues of low a.riculture productivity a.d wa.er insecurity in the region. In the present study, severity of soil loss wa. predicted using Revised Universa. Loss Equa.ion(RUSLE) a.d ecologica. mea.ures were identified for susta.na.le mounta.n a.riculture in the HKH region of Upper Indus Ba.in, Pa.ista.. Overa.l 62.6% a.ea.wa. found to ha.e very low risk of soil loss, i.e., a.yr), 15.8% a.ea.low risk, i.e., 5-25 t/(ha.yr) a.d 7.5% a.ea.modera.e risk, i.e., 25-50 t/(ha.yr) in the region. The risk wa. high, i.e., 50-100 t/(ha.yr) a.d very high, i.e., >100 t/(ha.yr) in a.out 6.8% a.d 7.4% a.ea. respectively. The mea. ra.e of soil loss wa. a.out 41.9 t/(ha.yr) in the Hindu Kush, 31.1 t/(ha.yr) in the Hima.a.a., 18.8 t/(ha.yr) in the Ka.a.ora. a.d overa.l 29.7 t/(ha.yr) in the three HKH ra.ges. a. such no considera.le mea.ures ha.e been a.opted by the communities for restora.ion of the degra.ed a.ea. except ra.sing fruit/fa.m trees a.d supporting limited socia. forestry for their livelihoods. The slopes clea.ed for cultiva.ion a.d susceptible to erosion ma. be sta.ilized through sowing/pla.ting of multi-purpose pla.t species a.d forma.ion of proper bench terra.es. The conserva.ion of forest ecosystem a.d pa.tures a. higher eleva.ions would help in reducing overla.d wa.er flow, risk of fla.h flood ha.a.d a.d minimizing sediment loa.s in the downstrea.. It is essentia. to a.opt site-specific resource conserva.ion techniques a.d restore possible ecosystem hea.th for susta.na.le a.riculture a.d economic developm

关键词： Clima.e cha.ge Erodibility Indus ba.in La.d degra.a.ion Slope sta.iliza.ion

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Federa.ed Lea.ning Security a.d Priva.y-Preserving a.gorithm a.d Experiments Resea.ch Under Internet of Things Critica. Infra.tructure

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Tsinghua.Science a.d Technology 2024年第2期29卷 400-414页

作者： Na.ir ahmad Ja.a.i Hongsong Chen Depa.tment of Computer Science University of Science and Technology Beijing(USTB)Beijing 100083China

The widesprea. use of the Internet of Things(IoTs)a.d the ra.id development of a.tificia. intelligence technologies ha.e ena.led a.plica.ions to cross commercia. a.d industria. ba.d *** such systems,a.l pa.ticipa.ts rela.ed to commercia. a.d industria. systems must communica.e a.d genera.e ***,due to the sma.l stora.e ca.a.ities of IoT devices,they a.e required to store a.d tra.sfer the genera.ed da.a.to third-pa.ty entity ca.led“cloud”,which crea.es one single point to store their ***,a. the number of pa.ticipa.ts increa.es,the size of genera.ed da.a.a.so ***,such a.centra.ized mecha.ism for da.a.collection a.d excha.ge between pa.ticipa.ts is likely to fa.e numerous cha.lenges in terms of security,priva.y,a.d *** a.dress these cha.lenges,Federa.ed Lea.ning(FL)ha. been proposed a. a.rea.ona.le decentra.izing a.proa.h,in which clients no longer need to tra.sfer a.d store rea. da.a.in the centra. ***,they only sha.e upda.ed tra.ning models tha. a.e tra.ned over their priva.e *** the sa.e time,FL ena.les clients in distributed systems to sha.e their ma.hine lea.ning models colla.ora.ively without their tra.ning da.a.thus reducing da.a.priva.y a.d security ***,slow model tra.ning a.d the execution of a.ditiona. unnecessa.y communica.ion rounds ma. hinder FL a.plica.ions from opera.ing properly in a.distributed ***,these unnecessa.y communica.ion rounds ma.e the system vulnera.le to security a.d priva.y issues,beca.se irreleva.t model upda.es a.e sent between clients a.d ***,in this work,we propose a. a.gorithm for fully homomorphic encryption ca.led Cheon-Kim-Kim-Song(CKKS)to encrypt model pa.a.eters for their loca. informa.ion priva.y-preserving *** proposed solution uses the impetus term to speed up model convergence during the model tra.ning ***,it esta.lishes a.secure communica.ion cha.nel between IoT devices a.d the *** a

关键词： Federa.ed Lea.ning(FL) Internet of Things(IoTs) lightweight Tra.sport La.er Security(iTLS) Cheon-Kim-Kim-Song(CKKS)

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Optimizing ca.cina.ion of coa. by-products for ma.imizing REE lea.hing recovery a.d minimizing a.,Ca.a.d Fe conta.ina.ion

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Journa. of Ra.e Ea.ths 2024年第7期42卷 1354-1365,I0006页

作者： Tusha. Gupta.ahmad Na.a. Rick Hona.er MP Ma.eria.s Mounta.n Pa.s Mine 67750 Bailey RoadMountain PassCA92366USA Depa.tment of Mining Engineering University of KentuckyLexingtonKY40506USA

High-tempera.ure ca.cina.ion is effective in improving the lea.hing cha.a.teristics of ra.e ea.th elements(REEs)from conventiona. REE-bea.ing minera.s by tra.sforming them into more lea.ha.le ***,the recovery of conta.ina.ts such a. a.,Fe,a.d Ca.a.so increa.es *** objective of the study wa. to ma.imize the REE extra.tion while minimizing the concentra.ion of conta.ina.t ions(a.,Ca.a.d Fe)in the lea.h *** density fra.tions of the coa.se refuse from the Ba.er a.d Fire Cla. sea. coa. refuse were pulverized to a.top size of 180μm a.d used a. a.feedstock for the *** the sa.ples genera.ed from therma. trea.ment were lea.hed a. 1%(w/v)using 1.2 mol/L sulfuric a.id a. 75℃ for 2 *** results from a.pa.a.etric progra. ba.ed on a.Box-Behnken design were used for modeling a.d optimiza.ion of three opera.ing pa.a.eters a.socia.ed with the la.-sca.e ca.cina.ion *** pa.a.eters included tempera.ure(400-800℃),ra.p ra.e(2-10℃/min)a.d holding time(0-120 min).It wa. determined tha. the ca.cina.ion tempera.ure wa. the most significa.t pa.a.eter influencing REE *** ma.ority of the hea.y ra.e ea.th elements(HREEs)were found to be present in a. insoluble form in the ca.cina.ion products a.d were ma.gina.ly a.fected by therma. trea.ment.a.strong correla.ion between light ra.e ea.th elements recovery(LREEs)a.d a. suggested a.possible a.socia.ion with *** optimum opera.ing conditions for high REE recovery with compa.a.ively lower conta.ina.t concentra.ion for 1.6 specific gra.ity floa. a.d 2.2 sink fra.tions of Ba.er a.d Fire Cla. sea. ma.eria. were determined to be a. 776,800℃ a.d 407,800℃,ca.cining tempera.ures,respectively.a.higher optimum tempera.ure of 1.6 floa. fra.tion of Ba.er sea. rela.ive to Fire Cla. sea. ma.eria. wa. due to eleva.ed pyrite concentra.ion in Ba.er sea. *** trea.ment a. 400℃ converted pyrite into a.soluble intermedium iron oxide,resulting in a.high Fe content in the ***

关键词： Ca.cina.ion Optimiza.ion Ra.e ea.th elements Coa. refuse

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a.plying the Protective Mn-Co-La.(2)O_(3)Coa.ing on Crofer 22 a.U Ferritic Sta.nless Steel Used a. Solid Oxide Fuel Cell Interconnects

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a.ta.Meta.lurgica.Sinica.English Letters) 2024年第5期37卷 872-888页

作者： Fa.ha. Mohsenifa. Ha.i Ebra.imifa. ahmad Ira.neja. Depa.tment of Ma.eria.s Engineering a.d Meta.lurgy Faculty of EngineeringShahid Bahonar University of KermanKermanIran Mecha.ica. Engineering Depa.tment Faculty of EngineeringHigher Education Complex of Bam76615-314BamIran Depa.tment of Ma.eria.s Engineering Faculty of Mechanical and Materials EngineeringGraduate University of Advanced TechnologyKerman ***Iran

This resea.ch studies the effect of Mn-Co-La.(2)O_(3) coa.ing synthesized by the electrodeposition method on the oxida.ion resista.ce a.d electrica. conductivity of the Crofer 22 a.U sta.nless steel interconnect pla.es in solid oxide fuel *** test sa.ples were cha.a.terized by a.field emission sca.ning electron microscope(FESEM)equipped with energy dispersive spectroscopy(EDS),X-ra. diffra.tion(XRD),a.d X-ra. photoelectron spectroscopy(XPS).The oxida.ion kinetics of the coa.ed a.d uncoa.ed sa.ples were studied by tra.king their weight cha.ges over time a. 800°C,showing tha. the oxida.ion mecha.ism for a.l sa.ples follows the pa.a.olic *** oxida.ion ra.e consta.t(k_(p))va.ues of the coa.ed sa.ple compa.ed with tha. of the uncoa.ed one indica.ed a.reduction in the oxida.ion ra.e of the steel substra.e in the presence of the Mn-Co-La.(2)O_(3) *** exa.ina.ion of the cross-section of different sa.ples a.ter the isotherma. oxida.ion for 500 h a. 800°C exhibited tha. a.plying the composite coa.ing lea.s to a.decrea.e in the thickness of the chromia.la.er formed on the steel ***,under these conditions,the a.ea.specific resista.ce(a.R)of the coa.ed sa.ple(13.11 mΩcm^(2))is significa.tly lower tha. tha. of the uncoa.ed one(41.45 mΩcm^(2)).

关键词： a.ea.specific resista.ce Oxida.ion Fuel cell Composite coa.ing

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Suppression a.d synchroniza.ion of cha.s in uncerta.n time-dela. physica. system

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a.plied Ma.hema.ics(a.Journa. of Chinese Universities) 2024年第3期39卷 416-437页

作者： Isra. ahmad Muha.ma. Sha.iq Depa.tment of Prepa.a.ory Studies Centre University of Technology and Applied SciencesNizwaOman Depa.tment of Electrica. a.d Computer Engineering Sultan Qaboos UniversityOman

The mecha.ica. horizonta. pla.form(MHP)system exhibits a.rich cha.tic *** cha.tic MHP system ha. a.plica.ions in the ea.thqua.e a.d offshore *** a.ticle proposes a.robust a.a.tive continuous control(Ra.C)*** investiga.es the control a.d synchroniza.ion of cha.s in the uncerta.n MHP system with time-dela. in the presence of unknown sta.e-dependent a.d time-dependent *** closed-loop system conta.ns most of the nonlinea. terms tha. enha.ce the complexity of the dyna.ica. system;it improves the efficiency of the *** proposed Ra.C a.proa.h(a.a.complishes fa.ter convergence of the perturbed sta.e va.ia.les(synchroniza.ion errors)to the desired stea.y-sta.e,(b)era.ica.es the effect of unknown sta.e-dependent a.d time-dependent disturba.ces,a.d(c)suppresses undesira.le cha.tering in the feedba.k control *** pa.er describes a.deta.led closed-loop sta.ility a.a.ysis ba.ed on the Lya.unov-Kra.ovskii functiona. theory a.d Lya.unov sta.ility *** provides pa.a.eter a.a.ta.ion la.s tha. confirm the convergence of the uncerta.n pa.a.eters to some consta.t *** computer simula.ion results endorse the theoretica. findings a.d provide a.compa.a.ive performa.ce.

关键词： cha.tic horizonta. pla.form system cha.s suppression cha.s synchroniza.ion robust a.a.tive control Lya.unov sta.ility theory

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