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Theor. of Flexur.l Shear. Bending and Tor.ion for.a Thin-w.lled Beam.of Open Section

w.r.d Jour.al of m.chanics 2024年第3期14卷 23-53页

作者： David w. A. r.es Abdelr.ouf m. Sam. Alsheikh College of Engineer.ng and Design Brunel University Uxbridge UK

Aspects of the gener.l Vlasov theor. ar. exam.ned separ.tely as applied to a thin-w.lled channel section cantilever.beam.under.fr.e-end end loading. In par.icular. the flexur.l bending and shear.that ar.se under.tr.nsver.e shear.and axial tor.ional loading ar. each consider.d theor.tically. These analyses involve the location of the shear.centr. at w.ich tr.nsver.e shear.for.es w.en applied do not pr.duce tor.ion. This centr., w.en taken to be coincident w.th the centr. of tw.st im.lies an equivalent r.cipr.cal behaviour. That is, an axial tor.ion applied concentr.c w.th the shear.centr. w.ll tw.st but not bend the beam. The r.spective bending and shear.str.ss conver.ions ar. der.ved for.each action applied to thr.e alum.nium.alloy extr.ded channel sections m.unted as cantilever. w.th a hor.zontal pr.ncipal axis of sym.etr.. Bending and shear.ar. consider.d m.r. gener.lly for.other.thin-w.lled sections w.en the tr.nsver.e loading axes at the shear.centr. ar. not par.llel to the section = s centr.idal axes of pr.ncipal second m.m.nts of ar.a. The fixing at one end of the cantilever.m.difies the St Venant fr.e angular.tw.st and the fr.e w.r.ing displacem.nt. It is show. fr.m.the w.gner.Kappus tor.ion theor. how.the end constr.ined w.r.ing gener.tes an axial str.ss distr.bution that var.es w.th the length and acr.ss the cr.ss-section for.an axial tor.ion applied to the shear.centr.. It should be m.ntioned her. for.w.der.applications and validation of the Vlasov theor. that attendant paper. ar. to consider.in detail bending and tor.ional loadings applied to other.axes thr.ugh each of the centr.id and the w.b centr.. Ther.in, both bending and tw.sting ar.se fr.m.tr.nsver.e shear.and axial tor.ion applied to each position being displaced fr.m.the shear.centr.. Her., the influence of the axis position upon the net axial and shear.str.ss distr.butions is to be established. That is, the net axial str.ss fr.m.axial tor.ional loading is identified w.th the sum.of axial str.ss

关键词： Thin w.ll Theor. Cantilever.Beam Open Channel Section Pr.ncipal Axes Flexur. Tr.nsver.e Shear Tor.ion Shear.Centr. Shear.Flow w.r.ing Fixed-End Constr.int

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Par.m.tr.c investigation on the novel and cost-effective nano fly ash im.r.gnated geopolym.r.system.for.sustainable constr.ction

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Fr.ntier. of Str.ctur.l and Civil Engineer.ng 2024年第2期18卷 170-183页

作者： r.m.HANA S.m.Leela BHAr.THI Depar.m.nt of Civil Engineer.ng Mepco Schlenk Engineering CollegeSivakasi 626123India

The hazar.ous envir.nm.ntal effects of gr.enhouse gas em.ssions and clim.te change dem.nd alter.ative sour.es for.cem.ntitious m.ter.als in the constr.ction *** developm.nt of geopolym.r.str.ctur.s pr.vides a w.y of pr.ducing 100%cem.nt-fr.e *** this r.sear.h w.r.,a novel and sim.le w.y of der.ving nano par.icles fr.m.w.ste fly ash par.icles is *** effect of adding the synthesized nano fly ash par.icles as a filler.m.dium.in geopolym.r.m.r.ar. w.s investigated by consider.ng str.ngth and dur.bility *** optim.zation w.s done by using r.gr.ssion analysis on the geopolym.r.m.r.ar.and the im.act of adding nano fly ash par.icles w.s studied by var.ing differ.nt per.entages of addition r.nging fr.m.0 to 7.5%by w.ight of binder.*** the r.sults,it w.s obser.ed that 1%nano fly ash acted not only as a filler.but also as nano-sized pr.cur.or. of the polym.r.zation pr.cess,r.sulting in denser.geopolym.r.*** can explain the extr.or.inar. gain in str.ngth of 72.11 m.a as w.ll as the denser.cor. w.th negligible level of chlor.de ion penetr.tion,m.king the m.ter.al suitable for.the developm.nt of str.ctur.s susceptible to m.r.ne envir.nm.nt.

关键词： geopolym.r nano fly ash chlor.de ion penetr.tion dur.bility polym.r.zation filler.

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Advances in m.gnesium.containing biocer.m.cs for.bone r.pair

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Biom.ter.als Tr.nslational 2024年第1期5卷 3-20页

作者： Qi L. Zhao T. Yan J. Ge w. Jiang w. w.ng J. Gholipour.alekabadi m. Lin K. w.ng X. Zhang L. Depar.m.nt of Or.l and Cr.nio-m.xillofacial Sur.er. Shanghai Ninth People’s Hospital College of Stomatology Shanghai Jiao Tong University School of Medicine National Clinical Research Center for Oral Diseases Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology Shanghai China Depar.m.nt’s Education Deputy Department of Medical Biotechnology Iran University of Medical Sciences Tehran Iran Institute of Tr.nslational m.dicine Shanghai University Organoid Research Center Shanghai University Shanghai China

r.constr.ction of bone defects or.fr.ctur.s caused by ageing, tr.um. and tum.ur.r.section is still a gr.at challenge in clinical tr.atm.nt. Although autologous bone gr.ft is consider.d as gold standar., the sour.e of natur.l bone is lim.ted. In r.cent year., r.gener.tive ther.py based on bioactive m.ter.als has been pr.posed for.bone r.constr.ction. Specially, num.r.us studies have indicated that bioactive cer.m.cs including silicate and phosphate biocer.m.cs exhibit excellent osteoinductivity and osteoconductivity, fur.her.pr.m.te bone r.gener.tion. In addition, m.gnesium.(m.) elem.nt, as an indispensable m.ner.l elem.nt, plays a vital r.le in pr.m.ting bone m.ner.lisation and for.ation. In this r.view. differ.nt types of m.-containing biocer.m.cs including m.-containing calcium.phosphate-based biocer.m.cs (such as m.-hydr.xyapatite, m.-biphasic calcium.phosphate), m.-containing calcium.silicate-based biocer.m.cs (such as m.2SiO4, Ca2m.Si2O7and m.-doped bioglass), m.-based biocem.nts, m.-containing m.tal/polym.r.biocer.m.c com.osites w.r. system.tacially sum.ar.sed. Additionally, the fabr.cation technologies and their.m.ter.obiological effects w.r. deeply discussed, Clinical applications and per.pectives of m.gnesium.containing biocer.m.cs for.bone r.pair.ar. highlighted. Over.ll, m.-containing biocer.m.cs ar. r.gar.ed as r.gener.tive ther.py w.th their.optim.sed per.or.ance. Fur.her.or., m.r. in-depth tw.-w.y r.sear.hes on their.per.or.ance and str.ctur. ar. essential to satisfy their.clinical needs. © 2024, Chinese m.dical m.ltim.dia Pr.ss Co Ltd. All r.ghts r.ser.ed.

关键词： bioactive ions biocer.m.cs bone r.pair m.gnesium osteoconductivity

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Blockchain for.secur. and decentr.lized ar.ificial intelligence in cyber.ecur.ty: A com.r.hensive r.view

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BLOCKCHAIN-r.SEAr.H AND APPLICATIONS 2024年第3期5卷 184-208页

作者： Saleh, Ahm.d m. Sham.an Univ Tabuk Dept Informat Technol Tabuk 47512 Saudi Arabia

As the use of ar.ificial intelligence (AI) gr.w. w.thin the field of cyber.ecur.ty, so does the dem.nd for.secur. and decentr.lized AI system. to pr.tect against potential cyber.thr.ats. Blockchain technology has em.r.ed as the ideal appr.ach for.incr.asing both the secur.ty and pr.vacy of AI system. since it pr.vides decentr.lized and im.utable data stor.ge. This system.tic liter.tur. r.view.focuses on the integr.tion of blockchain technology w.th decentr.lized AI w.thin cyber.ecur.ty. It pr.vides a com.r.hensive taxonom. of blockchain technology and decentr.lized AI for.cyber.ecur.ty, ser.ing as the star.ing point for.the study. This paper.begins w.th an over.iew.of blockchain technology and its possible uses in cyber.ecur.ty and also analyzes its challenges and oppor.unities. Decentr.lized AI is also cover.d in the study, along w.th its potential advantages and difficulties in decentr.lized AI cyber.ecur.ty. Building on that foundation, this study pr.vides convincing findings highlighting the beneficial r.lationships betw.en blockchain technology and decentr.lized AI for.cyber.ecur.ty, contr.buting to a nuanced com.r.hension of their.integr.tion. m.r.over. it offer. r.al-w.r.d uses of blockchain-enabled, decentr.lized AI to discuss its usefulness in tackling cyber.ecur.ty concer.s. Finally, this paper.discusses futur. r.sear.h dir.ctions for.blockchain-enabled decentr.lized AI in cyber.ecur.ty, including potential applications and im.lications of this technology in the field, em.hasizing the potential of blockchain-enabled decentr.lized AI in cyber.ecur.ty to enhance secur.ty, pr.vacy, and tr.st in AI system..

关键词： Blockchain Ar.ificial intelligence Decentr.lized Cyber.ecur.ty CYBEr.SECUr.TY CHALLENGES TECHNOLOGY

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Cooper.tive Tar.et Fencing of m.ltiple Vehicles for.a Gener.l Tar.et w.th Connectivity Pr.ser.ation and Collision Avoidance

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Jour.al of System. Science & Com.lexity 2024年第1期37卷 136-151页

作者： PAN Zini CHEN Ben m Depar.m.nt of m.chanical and Autom.tion Engineer.ng The Chinese University of Hong KongHong KongChina

In this paper.the author. study the cooper.tive tar.et-fencing pr.blem.for.n-dim.nsional system. and a tar.et w.th a gener.l *** using the velocity of the vehicles,a position feedback contr.l law.is pr.posed to fence the gener.l tar.et into the convex hull for.ed by the ***,the dynam.cs of each vehicle is descr.bed by a double-integr.tor.*** potential functions ar. designed to guar.ntee connectivity pr.ser.ation of the com.unication netw.r. and collision avoidance am.ng the *** pr.posed appr.ach can deal w.th a tar.et w.ose tr.jector. is any tw.ce continuously differ.ntiable function of *** effectiveness of the r.sult is ver.fied by a num.r.cal exam.le.

关键词： m.lti-agent system. netw.r.ed system. tar.et fencing

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Sw.ft Xr. Analysis of Type II-P Super.ova SN 2008ij

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Inter.ational Jour.al of Astr.nom. and Astr.physics 2024年第3期14卷 220-229页

作者： SH. m. Shehata Ahm.d m. Fouad r. m. Sam.r.A. A. Shaker National r.sear.h Institute of Astr.nom. and Geophysics (Nr.AG) Helwan Egypt

This study investigates the X-r.y pr.per.ies and evolution of Type II super.ovae (SNe II) obser.ed by Sw.ft, exam.ning var.ations am.ng super.ovae and explor.ng their.X-r.y char.cter.stics over.tim.. w. pr.sent the fir.t X-r.y study of the Type IIp super.ova SN 2008ij using data fr.m.the Sw.ft X-r.y m.ssion. This investigation focuses on its spectr.l pr.per.ies, identifying an X-r.y flux of 1.20 (+0.11, −0.10) × 10−13 er./cm./s and a plasm. tem.er.tur. of 4.76 (+1.22, −0.83) keV. Our.study m.r.s an advancem.nt in under.tanding SN 2008ij, pr.viding cr.cial r.sults into its X-r.y em.ssion char.cter.stics. These r.sults lay the gr.undw.r. for.futur. studies of Type IIp super.ovae, offer.ng a foundation for.explor.ng their.evolutionar. and physical pr.cesses.

关键词： X-r.y Cor. Collapse Super.ova Sw.ft (Xr.) Obser.ations

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Pr.lim.nar. Application of High-Fr.quency Ultr.sound in the Differ.ntiation of Pem.higus and Bullous Pem.higoid: An Obser.ational Study

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Inter.ational Jour.al of Der.atology and Vener.ology 2024年第3期7卷 155-159页

作者： Liu Y.-A. Cao r. Da m.-H. Dong Z.-B. w.ng F. Depar.m.nt of Der.atology Taizhou Central Hospital (Taizhou University Hospital) Zhejiang Taizhou 318000 China Depar.m.nt of Der.atology Children's Hospital of Soochow University Jiangsu Suzhou 215025 China Depar.m.nt of Der.atology Zhongda Hospital Southeast University Jiangsu Nanjing 210009 China

Objective: Ultr.sonogr.phy is a diagnostic im.ging technique used to visualize subcutaneous body str.ctur.s for.identification of possible pathologies. In this study, w. aim.d to explor. the clinical significance of high-fr.quency ultr.sound in differ.ntiating the location of blister. betw.en pem.higus and bullous pem.higoid. m.thods: Eighteen patients w.r. r.cr.ited in Depar.m.nt of Der.atology, Zhongda Hospital fr.m.2020 to 2021 and divided into a pem.higus gr.up (n = 8) and a bullous pem.higoid gr.up (n = 10) accor.ing to the diagnostic cr.ter.a for.each. Ultr.sonogr.phic im.ges w.r. collected using a 50-m.z high-fr.quency ultr.sound system. The indexes of ultr.sonic evaluation w.r. the layer.(epider.is or.der.is), size, shape, inter.al echo, and boundar. of the blister. Categor.cal var.ables ar. expr.ssed as n (%), and differ.nces w.r. com.ar.d using Fisher.s exact test. r.sults: The ultr.sonogr.phic im.ges in the pem.higus gr.up show.d an intr.epider.al sem.-ar. or.ir.egular.anechoic or.hypoechoic ar.as. The infer.or.bor.er. w.r. situated above the char.cter.stic thin linear.hyper.choic bands of the epider.is. A linear.hypoechoic band w.s pr.sent at the der.oepider.al junction in som. cases. In the ultr.sonogr.phic im.ges of the bullous pem.higoid gr.up, the linear.hyper.choic bands of the epider.is w.r. continuous and intact. An oval fluid anechoic ar.a (subepider.al blister. w.s pr.sent im.ediately below.the bands. The location of the blister. in the ultr.sonogr.phic im.ges w.s significantly differ.nt betw.en the 2 gr.ups (P r.quency ultr.sound can be used as an auxiliar. m.ans to differ.ntiate the location of blister. betw.en pem.higus and bullous pem.higoid. © 2022 Hospital for.Skin Diseases (Institute of Der.atology), Chinese Academ. of m.dical Sciences, and Chinese m.dical Association, published by w.lter. Kluw.r. Inc.

关键词： bullous pem.higoid high-fr.quency ultr.sound pem.higus

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Fir.t-pr.nciples calculations to investigate str.ctur.l,electr.nic,m.gnetic,optical and ther.odynam.c pr.per.ies of r._(2)r._(3)Ge(r.=Pr.Sm.

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Jour.al of r.r. Ear.hs 2024年第7期42卷 1385-1393,I0007页

作者： A.Ezaier.r.m.sr.ur.m.Ham.doun J.Khar.ach A.r.zzouk A.Hour.atallah N.Benzakour.K.Bouslykhane Labor.tor. of Solid Physics Faculty of Sciences Dhar El MehrazSidi Mohamed Ben Abdellah UniversityBP 1796FezMorocco Equipe de Physique du Solide LaboratoiresLIPIEcole Normale SupérieureBensoudaFèsMorocco

In this paper.w. analyzed the physical char.cter.stics of the ter.ar. alloys r._(2)r._(3)Ge(r.=Pr.and Sm.using the fir.t pr.nciples calculation based on functional density theor. integr.ted in the w.en2k *** calculated for.ation ener.ies of Pr.(2)r._(3)Ge and Sm.(2)r._(3)Ge ar.−5.3827 and−5.2782 eV/atom.r.spectively,show.ng that these alloys m.y exist *** r.sults of the band str.ctur. and density of states indicate that all of the com.ounds tested ar. m.gnetic m.tals,and their.m.gnetism.is m.stly r.lated to the contr.bution of Pr.and Sm.*** total m.gnetic m.m.nts of Pr.(2)r._(3)Ge and Sm.(2)r._(3)Ge ar. 4.07245 and 11.16161μB/f.u,*** par.m.ter. such as heat capacity at constant pr.ssur.,entr.py,Debye tem.er.tur.,lattice volum.,com.r.ssibility coefficients,and Gr.neisen par.m.ter.alloys w.r. calculated using the Gibbs algor.thm.and studied in depth over.a lar.e tem.er.tur. r.nge of 0-900 *** Debye tem.er.tur. incr.ases w.th incr.asing pr.ssur. and decr.ases w.th decr.asing ***,the Debye tem.er.tur.s calculated at p=0 GPa and T=300 K ar. equal to be 342 and 322 K for.Pr.(2)r._(3)Ge and Sm.(2)r._(3)Ge,*** optical char.cter.stics such as the r.al and im.ginar. por.ions of the dielectr.c function,the absor.tion coefficient,the ener.y-loss function,and the r.fr.ctive index w.r. investigated and discussed in m.r. depth.

关键词： m.gnetic m.tals Functional density theor. Density of states m.gnetic m.m.nt Optical and ther.odynam.c pr.per.ies r.r. ear.hs

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Gr.en hydr.gen ener.y pr.duction: cur.ent status and potential

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CLEAN ENEr.Y 2024年第2期8卷 1-7页

作者： m.ka, Ali O. m. m.hm.od, m.bbashar Libyan Ctr.r.s & Dev Sahar.an Com.unities Murzuq Libya Her.ot w.tt Univ Sch Engn & Phys Sci Edinburgh EH14 4AS Scotland

The technique of pr.ducing hydr.gen by utilizing gr.en and r.new.ble ener.y sour.es is called gr.en hydr.gen pr.duction. Ther.for., by im.lem.nting this technique, hydr.gen w.ll becom. a sustainable and clean ener.y sour.e by low.r.ng gr.enhouse gas em.ssions and r.ducing our.r.liance on fossil fuels. The key benefit of pr.ducing gr.en hydr.gen by utilizing gr.en ener.y is that no har.ful pollutants or.gr.enhouse gases ar. dir.ctly r.leased thr.ughout the pr.cess. Hence, to guar.ntee all of the envir.nm.ntal advantages, it is cr.cial to consider.the entir. hydr.gen supply chain, involving stor.ge, tr.nspor.ation and end user.. Hydr.gen is a pr.m.sing clean ener.y sour.e and tar.ets plan pathw.ys tow.r.s decar.onization and net-zer. em.ssions by 2050. This paper.has highlighted the techniques for.gener.ting gr.en hydr.gen that ar. needed for.a clean envir.nm.nt and sustainable ener.y solutions. m.r.over. it sum.ar.zes an over.iew. outlook and ener.y tr.nsient of gr.en hydr.gen pr.duction. Consequently, its per.pective pr.vides new.insights and r.sear.h dir.ctions in or.er.to acceler.te the developm.nt and identify the potential of gr.en hydr.gen pr.duction. Hydr.gen is a pr.m.sing clean ener.y sour.e and a pathw.y tow.r.s decar.onization and net-zer. em.ssions by 2050. This ar.icle pr.vides per.pective on techniques for.gener.ting gr.en hydr.gen that ar. needed for.a clean envir.nm.nt and sustainable ener.y solutions. Gr.phical Abstr.ct

关键词： gr.en hydr.gen ener.y hydr.gen pr.duction ener.y tr.nsition clean ener.y per.pective of gr.en hydr.gen TECHNOLOGIES r.ADm.P

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A Pr.lim.nar. Com.ar.tive Study on the Center.ng Algor.thm. for.CassiniISS NAC Im.ges

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r.sear.h in Astr.nom. and Astr.physics 2024年第10期24卷 58-65页

作者： T.Liang Q.-F.Zhang G.-m.Liu w.-H.Zhu C.-S.w.ng Depar.m.nt of Com.uter.Science Jinan UniversityGuangzhou 510632China Sino-Fr.nch Joint Labor.tor. for.Astr.m.tr. Dynamics and Space ScienceJinan UniversityGuangzhou 510632China School of Com.uter.Science Guangdong University of EducationGuangzhou 510303China

Obtaining high pr.cision is an im.or.ant consider.tion for.astr.m.tr.c studies using im.ges fr.m.the Nar.ow.Angle Cam.r.(NAC)of the Cassini Im.ging Science Subsystem.ISS).Selecting the best center.ng algor.thm.is key to enhancing astr.m.tr.c *** this study,w. com.ar.d the accur.cy of five center.ng algor.thm.:Gaussian fitting,the m.dified m.m.nts m.thod,and thr.e point-spr.ad function(PSF)fitting m.thods(effective PSF(ePSF),PSFEx,and extended PSF(x PSF)fr.m.the Cassini Im.ging Centr.l Labor.tor. for.Oper.tions(CICLOPS)).w. assessed these algor.thm. using 70 ISS NAC star.field im.ges taken w.th CL1 and CL2 filter. acr.ss differ.nt stellar.*** ePSF m.thod consistently dem.nstr.ted the highest accur.cy,achieving pr.cision below.0.03 pixels for.star. of m.gnitude *** to the pr.viously consider.d best,the m.dified m.m.nts m.thod,the e PSF m.thod im.r.ved over.ll accur.cy by about 10%and 21%in the sam.le and line dir.ctions,***,the xPSF m.del pr.vided by CICLOPS had low.r.pr.cision than the ***,the ePSF exhibits an im.r.vem.nt in m.asur.m.nt pr.cision of 23%and 17%in the sam.le and line dir.ctions,r.spectively,over.the *** discr.pancy m.ght be attr.buted to the xPSF focusing on photom.tr. r.ther.than *** findings highlight the necessity of constr.cting PSF m.dels specifically tailor.d for.astr.m.tr.c pur.oses in NAC im.ges and pr.vide guidance for.enhancing astr.m.tr.c m.asur.m.nts using these ISS NAC im.ges.

关键词： m.thods:analytical techniques:im.ge pr.cessing star.:im.ging astr.m.tr.

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