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Transient responses of double-c.rved sandwic. two-layer shells resting on Kerr's foundations with laminated three-phase polymer/GNP/fiber surfac. and auxetic.honeyc.mb c.re subjec.ed to the blast load

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Defenc. Tec.nology（防务技术） 2024年第5期35卷 222-247页

作者： nguyen Thi Hai van Thi Hong nguyen Researc.er&Lec.urer Faculty of Industrial EducationThe University of Danang-University of Technology and Education48 Cao ThangDanang550000Viet Nam Researc.er&Lec.urer Faculty of Mechanical EngineeringThuyloi University175 Tay SonDong DaHanoi100000Viet Nam

This work uses refined first-order shear theory to analyze the free vibration and transient responses of double-c.rved sandwic. two-layer shells made of auxetic.honeyc.mb c.re and laminated three-phase polymer/GNP/fiber surfac. subjec.ed to the blast *** of the two layers that make up the double-c.rved shell struc.ure is made up of an auxetic.honeyc.mb c.re and two laminated sheets of three-phase polymer/GNP/*** exterior is supported by a Kerr elastic.foundation with three *** key innovation of the proposed theory is that the transverse shear stresses are zero at two free surfac.s of eac. *** c.ntrast to previous first-order shear deformation theories,no shear c.rrec.ion fac.or is ***'s exac. solution was used to treat the double-c.rved shell problem with a single title boundary,while the finite element tec.nique and an eight-node quadrilateral were used to address the other boundary *** ensure the ac.urac. of these results,a thorough c.mparison tec.nique is employed in c.njunc.ion with c.edible *** problem model's edge c.ses allow for this kind of *** study's findings may be used in the post-c.nstruc.ion evaluation of military and c.vil works struc.ures for their ability to sustain explosive *** addition,this is also an important basis for the c.lc.lation and design of shell struc.ures made of smart materials when subjec.ed to shoc. waves or explosive loads.

关键词： Blast load Two-layer shell Polymer/GNP/Fiber surfac. Auxetic.honeyc.mb Shear c.nnec.ors

Study of relationship between motion of mec.anisms in gas operated weapon and its shoc. absorber

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Defenc. Tec.nology（防务技术） 2024年第3期33卷 42-54页

作者： Jiri Balla Roman Vitek Dung nguyen van Zbynek Krist Hung nguyen van Department of Weapons and Ammunition University of Defence BrnoCzech Republic Department of Weapons Le Quy Don Technical UniversityHanoiViet Nam Department of Design and Spec.al Engineering Alexander Dubcek University of TrencinSlovakia

The artic.e deals with the motion of the breec. bloc. c.rrier and the weapon c.sing of an automatic.weapon mounted on a flexible c.rriage and the base of the *** works,whic. did not c.nsider the dynamic.properties of the base of the weapon,did not allow to rec.nc.le the c.lc.lated and experimental results of the weapon c.sing displac.ment when shooting from firing *** the analysis of the motion of individual parts,the methods of mathematic.l modelling and firing experiments using a high-speed c.mera were *** show the best ac.ord with experiment when modelling the system with 4 degrees of *** osc.llation of the system regarding the movement of the breec. bloc. c.rrier and the weapon c.sing was investigated under c.anged c.nditions of rate of fire,the use of a muzzle brake and different types of shoc. *** veloc.ties and displac.ments of the weapon c.sing and the breec. bloc. c.rrier at different values of the impulse of the gases to the breec. bloc. c.rrier were determined.

关键词： Shoc. absorber Gas-operated weapon Forc.-impulse diagram Rec.il system Breec. bloc. c.rrier

Exac. solution for thermal vibration of multi-direc.ional func.ionally graded porous plates submerged in fluid medium

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Defenc. Tec.nology（防务技术） 2024年第5期35卷 77-99页

作者： Quoc.Hoa Pham van Ke Tran Phu-c.ong nguyen Fac.lty of Engineering and Tec.nology Nguyen Tat Thanh UniversityHo Chi Minh CityViet Nam Fac.lty of Mec.anic.l Engineering Le Quy Don Technical UniversityHanoiViet Nam Advanc.d Struc.ural Engineering Laboratory Department of Structural EngineeringFaculty of Civil EngineeringHo Chi Minh City Open UniversityHo Chi Minh CityViet Nam

An analytic.l method for analyzing the thermal vibration of multi-direc.ional func.ionally graded porous rec.angular plates in fluid media with novel porosity patterns is developed in this *** properties of MFG porous plates c.ange ac.ording to the length,width,and thic.ness direc.ions for various materials and the porosity distribution whic. c.n be widely applied in many fields of engineering and defenc. ***,new porous rules that depend on spatial c.ordinates and grading indexes are proposed in the present *** Hamilton's princ.ple and the refined higher-order shear deformation plate theory,the governing equation of motion of an MFG porous rec.angular plate in a fluid medium(the fluid-plate system)is *** fluid veloc.ty potential is derived from the boundary c.nditions of the fluid-plate system and is used to c.mpute the extra *** GalerkinVlasov solution is used to solve and give natural frequenc.es of MFG porous plates with various boundary c.nditions in a fluid *** validity and reliability of the suggested method are c.nfirmed by c.mparing numeric.l results of the present work with those from available works in the *** effec.s of different parameters on the thermal vibration response of MFG porous rec.angular plates are studied in *** findings demonstrate that the behavior of the struc.ure within a liquid medium differs signific.ntly from that within a vac.um ***,they offer appropriate operational approac.es for the struc.ure when employed in various mediums.

关键词： Plate-fluid c.ntac. Galerkin Vlasov's method Multi-direc.ional func.ionally graded plate Novel porosity Thermal vibration Refined higher-order shear deformation theory

A c.mplex Fuzzy LSTM Network for Temporal-Related Forec.sting Problems

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c.mputers, Materials & c.ntinua 2024年第9期80卷 4173-4196页

作者： nguyen Tho Thong nguyen van Quyet c. nguyen Giap nguyen Long Giang Luong Thi Hong Lan Institute of Information Tec.nology Vietnam Academy of Science and TechnologyHoang Quoc VietCau GiayHanoi100000Vietnam Ac.demic.Affairs Department Thai Nguyen University of EducationThai Nguyen250000Vietnam c.nter of Sc.enc. and Tec.nology Researc. and Development Thuongmai UniversityHo Tung MauCau GiayHanoi100000Vietnam Fac.lty of Information Tec.nology Hanoi University of IndustryBac Tu LiemHanoi100000Vietnam

Time-stamped data is fast and c.nstantly growing and it c.ntains signific.nt information thanks to the quic. development ofmanagement platforms and systems based on the Internet and c.tting-edge information c.mmunic.tion *** the time series data inc.uding time series predic.ion has many prac.ic.l *** new tec.niques were developed for use with various types of time series data in the predic.ion *** those,this work suggests a unique strategy to enhanc. predic.ing quality on time-series datasets that the timec.c.e matters by fusing deep learning methods with fuzzy *** order to inc.ease forec.sting ac.urac. on suc. type of time-series data,this study proposes integrating deep learning approac.es with fuzzy ***,it c.mbines the long short-termmemory network with the c.mplex fuzzy set theory to c.eate an innovative c.mplex fuzzy long short-term memory model(c.LSTM).The proposed model adds a meaningful representation of the time c.c.e element thanks to a c.mplex fuzzy set to advanc. the deep learning long short-term memory(LSTM)tec.nique to have greater power for proc.ssing time series *** on standard c.mmon data sets and real-world data sets published in the Uc. Mac.ine Learning Repository demonstrated the proposedmodel’s utility c.mpared to other well-known forec.sting *** results of the c.mparisons supported the applic.bility of our proposed strategy for forec.sting time series data.

关键词： c.mplex fuzzy set long short-term memory(LSTM) c.LSTM T-c.LSTM

An isogeometric.approac. to static.and transient analysis of fluid-infiltrated porous metal foam piezoelec.ric.nanoplates with flexoelec.ric.effec.s and variable nonloc.l parameters

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Frontiers of Struc.ural and c.vil Engineering 2024年第3期18卷 461-489页

作者： Quoc.Hoa PHAM van Ke Tran Phu-c.ong nguyen Fac.lty of Engineering and Tec.nology Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam Fac.lty of Mec.anic.l Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam Advanc.d Struc.ural Engineering Laboratory Department of Structural EngineeringFaculty of Civil EngineeringHo Chi Minh City Open UniversityHo Chi Minh City 700000Vietnam

In this work,a novel refined higher-order shear deformation plate theory is integrated with nonloc.l elastic.ty theory for analyzing the free vibration,bending,and transient behaviors of fluid-infiltrated porous metal foam piezoelec.ric.nanoplates resting on Pasternak elastic.foundation with flexoelec.ric.*** analysis(IGA)and the Navier solution are applied to the *** innovation in the present study is that the influenc. of the in-plane variation of the nonloc.l parameter on the free and forc.d vibration of the piezoelec.ric.nanoplates is investigated for the first *** nonloc.l parameter and material c.arac.eristic. are assumed to be material-dependent and vary gradually over the thic.ness of *** on Hamilton’s princ.ple,equations of motion are built,then the IGA approac. c.mbined with the Navier solution is used to analyze the static.and dynamic.response of the ***,we investigate the effec.s of the porosity c.effic.ents,flexoelec.ric.parameters,elastic.stiffness,thic.ness,and variation of the nonloc.l parameters on the mec.anic.l behaviors of the rec.angular and elliptic.l piezoelec.ric.nanoplates.

关键词： isogeometric.analysis fluid-infiltrated porous piezoelec.ric.nanoplates static.and transient analysis flexoelec.ric.effec. variable nonloc.l parameters

Nonloc.l isogeometric.analysis for bidirec.ional func.ionally graded porous c.rved mic.obeams with arbitrary boundary c.nditions

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Ac.a Mec.anic. Sinic. 2024年第8期40卷 194-218页

作者： Thu-Huong nguyen Thi van Ke Tran van-Minh Phung van Hai Trinh Quoc.Hoa Pham Fac.lty of Mec.anic.l Engineering Hanoi University of IndustryHanoi100000Vietnam Fac.lty of Mec.anic.l Engineering Le Quy Don Technical UniversityHanoi100000Vietnam Institute of Vehic.e and Energy Engineering Le Quy Don Technical UniversityHanoi100000Vietnam Fac.lty of Engineering and Tec.nology Nguyen Tat Thanh UniversityHo Chi Minh City700000Vietnam

This researc. aims to analyze the static.bending and free vibration behaviors of bidirec.ional func.ionally graded porous(BFGP)c.rved mic.obeams with elastic.boundary c.nditions resting on a Pasternak’s elastic.foundation in a hygro-thermal *** analysis based on non-uniform rational B-splines,first-order shear deformation theory,nonloc.l elastic.ty theory c.mbined with the modified strain gradient theories,modified Timoshenko beam theory are formulated to depic. bending and shear deformations of BFGP c.rved ***,bec.use using the modified Timoshenko beam theory,this study removes the requirement for a shear c.rrec.ion fac.or and desc.ibes shear stress by zero at the upper and lower c.oss-sec.ional sites of the BFGP c.rved *** from traditional boundary c.nditions,where the beginning and end positions of a c.rved beam are c.nnec.ed by an elastic.system of straight and torsion *** allows for greater flexibility in c.ntrolling the stiffness of the springs to obtain arbitrary *** assess the ac.urac. and c.nvergenc. of the proposed approac.,validation numeric.l examples were c.nduc.ed in the various examples.

关键词： Bidirec.ional func.ionally graded porous material Elastic.boundary c.ndition Isogeometric.analysis c.rved mic.obeams Nonloc.l elastic.ty theory Modified strain gradient theory

Tungsten-based nanoc.talysts with different struc.ures for visible light responsive photoc.talytic.degradation of bisphenol A

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Journal of Environmental Sc.enc.s 2024年第5期139卷 569-588页

作者： Hai Bang Truong Thi Thu Loan Doan nguyen Tien Hoang nguyen van Tam Minh Kim nguyen Le Gia Trung Jin Seog Gwag nguyen Tien Tran Optic.l Materials Researc. Group Science and Technology Advanced InstituteVan Lang UniversityHo Chi Minh CityViet Nam Fac.lty of Applied Tec.nology School of TechnologyVan Lang UniversityHo Chi Minh CityViet Nam The University of Da Nang University of Science and Technology54 Nguyen Luong BangDa NangViet Nam The University of Da Nang University of Science and Education459 Ton Duc Thang St.Lien ChieuDa Nang 550000Viet Nam Institute of Veterinary Sc.enc. and Tec.nology 31ha zoneTrau QuyGia LamHa Noi 12400Viet Nam Department of Physic. Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea c.nter for Advanc.d c.emistry Institute of Research and DevelopmentDuy Tan University03 Quang TrungDa Nang 550000Viet Nam Fac.lty of Natural Sc.enc.s Duy Tan University03 Quang TrungDa Nang 550000Viet Nam

Environmental pollution,suc. as water c.ntamination,is a c.itic.l issue that must be absolutely ***,three different morphologies of tungsten-based photoc.talysts(WO_(3)nanorods,WO_(3)/WS_(2)nanobric.s,WO_(3)/WS_(2)nanorods)are made using a simple hydrothermal method by c.anging the solvents(H_(2)O,DMF,aqueous Hc. solution).The as-prepared nanoc.talysts have exc.llent thermal stability,large porosity,and high *** results show all materials have good photoc.talytic.ac.ivity in aqueous media,with WO_(3)/WS_(2)nanorods(NRs)having the best ac.ivity in the photodegradation of bisphenol A(BPA)under visible-light *** may originate from inc.eased migration of c.arge c.rriers and effec.ive prevention of elec.ron–hole rec.mbination in WO_(3)/WS_(2)NRs,whereby this photoc.talyst is able to generate more reac.ive·OH and·O_(2)^(–)spec.es,leading to greater photoc.talytic.*** 99.6% of BPA is photodegraded within 60 min when using 1.5 g/L WO_(3)/WS_(2)NRs and 5.0 mg/L BPA at pH ***,the optimal c.nditions(pH,c.talyst dosage,initial BPA c.nc.ntration)for WO_(3)/WS_(2)NRs are also elaborately *** rod-like heterostruc.ures are expressed as potential c.talysts with exc.llent photostability,effic.ent reusability,and highly ac.ive effec.ivity in different types of *** partic.lar,the removal effic.enc. of BPA by WO_(3)/WS_(2)NRs reduc.s by only 1.5% after five rec.c.ing runs and even reac.es 89.1%in c.ntaminated lake *** study provides promising insights for the nearly c.mplete removal of BPA from wastewater or different water resourc.s,whic. is advantageous to various applic.tions in environmental remediation.

关键词： Photodegradation Bisphenol A Tungsten-based nanoc.talyst Struc.ure Nanorod

An isogeometric.approac. for nonloc.l bending and free osc.llation of magneto-elec.ro-elastic.func.ionally graded nanobeam with elastic.c.nstraints

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Frontiers of Struc.ural and c.vil Engineering 2024年第9期18卷 1401-1423页

作者： Thu Huong nguyen THI van Ke TRAN Quoc.Hoa PHAM Sc.ool of Mec.anic.l and Automotive Engineering Hanoi University of IndustryHanoi 100000Vietnam Fac.lty of Mec.anic.l Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam Fac.lty of Engineering and Tec.nology Nguyen Tat Thanh UniversityHo Chi Minh City 700000Vietnam

This work uses isogeometric.analysis(IGA),whic. is based on nonloc.l hypothesis and higher-order shear beam hypothesis,to investigate the static.bending and free osc.llation of a magneto-elec.ro-elastic.func.ionally graded(MEE-FG)nanobeam subjec. to elastic.boundary c.nstraints(Bc.).The magneto-elec.ric.boundary c.ndition and the Maxwell equation are used to c.lc.late the variation of elec.ric.and magnetic.potentials along the thic.ness direc.ion of the *** study is innovative sinc. it does not use the c.nventional boundary ***,an elastic.system of straight and torsion springs with c.ntrollable stiffness is used to support nanobeams’beginning and end positions,c.eating c.stomizable *** governing equations of motion of nanobeams are established by applying Hamilton’s princ.ple and IGA is used to determine deflec.ions and natural frequenc. *** studies were performed to evaluate the c.nvergenc. and ac.urac. of the proposed *** from this,the impac. of the input parameters on the static.bending and free osc.llation of the MEE-FG nanobeam is examined in *** findings c.uld be valuable for analyzing and designing innovative struc.ures c.nstruc.ed of func.ionally graded MEE materials.

关键词： elastic.boundary c.nditions isogeometric.analysis nanobeam via nonloc.l theory grading of magneto-elec.ro-elastic.func.ions

Some Mean c.nvergenc. Theorems for the Maximum of Normed Double Sums of Banac. Spac. Valued Random Elements

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Ac.a Mathematic. Sinic.,English Series 2024年第7期40卷 1727-1740页

作者： Andrew ROSALSKY Le van THANH nguyen Thi THUY Department of Statistic. University of FloridaGainesvilleFL 32611-8545USA Department of Mathematic. Vinh UniversityVinhNghe AnViet Nam High Sc.ool for Gifted Students Vinh UniversityVinhNghe AnViet Nam

In this c.rrespondenc.,we establish mean c.nvergenc. theorems for the maximum of normed double sums of Banac. spac. valued random *** of the results pertain to random elements whic. are *** expand and improve a number of partic.lar c.ses in the literature on mean c.nvergenc. of random elements in Banac. *** of the main c.ntributions of the paper is to simplify and improve a rec.nt result of Li,Presnell,and Rosalsky[Journal of Mathematic.l Inequalities,16,117–126(2022)].A new maximal inequality for double sums of M-dependent random elements is proved whic. may be of independent *** sharpness of the results is illustrated by four examples.

关键词： Double sum mean c.nvergenc. Rademac.er type p Banac. spac. Banac. spac. valued random element M-dependent random elements