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a.plied m.them.tics a.d m.cha.ics(English Edition) 2012年第6期33卷 731-748页

作者： m.a.HRa. S.a.GHa. m.a.hossain Depa.tm.nt of m.them.tics COMSATS Institute of Information Technology Depa.tm.nt of m.them.tics King Abdulaziz University Depa.tm.nt of m.them.tics University of Dhaka

The com.uta.iona. study of the com.ined effects of ra.ia.ion a.d hydro- m.gnetics on the na.ura. convection flow of a.viscous, incom.ressible, a.d electrica.ly conducting fluid pa.t a.m.gnetized perm.a.le vertica. pla.e is presented. The governing non-sim.la. equa.ions a.e num.rica.ly solved by using a.finite difference m.thod for a.l va.ues of the suction pa.a.0}ter a.d the a.ym.totic solution for sm.ll a.d la.ge va.ues of ~. The effects of va.ying the Pra.dtl num.er Pr, the m.gnetic Pra.dtl num.er Prm. the m.gnetic force pa.a.0}ter S, the ra.ia.ion pa.a.0}ter Rd, a.d the surfa.e tem.era.ure Ow on the coefficients of the skin friction, the ra.e of hea. tra.sfer, a.d the current density a.e shown gra.hica.ly a.d in ta.les. a. a.tem.t is m.de to exa.0}ne the effects of the a.ove m.ntioned physica. pa.a.0}ters on the velocity profile, the tem.era.ure distribution, a.d the tra.sverse com.onent of the m.gnetic field.

关键词： hydrom.gnetic fluctua.ing na.ura. convection m.gnetized pla.e currentdensity hea. tra.sfer

Num.rica. Investiga.ion of a.m.dified Ka.ina.cycle system.for high-tem.era.ure a.plica.ion a.d genetic a.gorithm.ba.ed optim.za.ion of the m.lti-pha.e expa.der’s inlet condition

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能源与人工智能(英文) 2021年第4期6卷 71-87页

作者： m.ha.0}a. m.srur hossain m.Sa.ib hossain Niya. a.na. a.m.d m.m.njurul Ehsa. Depa.tm.nt of m.cha.ica. a.d Production Engineering Islamic University of TechnologyBoard BazarGazipur 1704Bangladesh

a. a. a.terna.ive to the conventiona. stea.0}Ra.kine Cycle,Ka.ina.Cycle ha. witnessed a.growing interest over the pa.t yea.s for high-tem.era.ure a.plica.ions(a.working fluid tem.era.ure of 500◦C a. the turbine inlet).However,the possibility of im.lem.nting a. a.ditiona. m.lti-pha.e expa.der on the wea. a.0}onia.wa.er solution loop of the Ka.ina.cycle wa. ha.dly a.a.yzed in the a.a.la.le *** this resea.ch,two novel Ka.ina.cycles(Ka.ina.cycle-12a.a.d Ka.ina.cycle-12B)ha.e been presented by integra.ing a.m.lti-pha.e expa.der in a.dition to the turbine insta.led downstrea.0}of the Ka.ina.*** Ka.ina.cycle-12a.this a.ditiona. m.lti-pha.e expa.der is positioned downstrea.0}of the Ka.ina.sepa.a.or a.d on the wea. a.0}onia.wa.er solution loop for Ka.ina.Cycle-12B.a.deta.led m.them.tica. m.del ba.ed on the therm.dyna.0}c la.s ha. been developed to solve a.d optim.ze the Ka.ina.*** influence of critica. decision pa.a.0}ters,specifica.ly the a.0}onia.concentra.ion on working fluid a.d eva.ora.ion pressure,were *** optim.za.ion wa. perform.d ba.ed on the objective to m.xim.ze the net power output from.the m.lti-pha.e expa.der under stea.y-sta.e opera.ing *** the perform.nce of the proposed Ka.ina.cycles wa. com.a.ed with the conventiona. Ka.ina.Cycle-12,both of them.dem.nstra.ed superior perform.nce,i.e.,net power output a.d pea. therm.l efficiency increa.ed by a.m.xim.m.va.ue of 3.23%for the proposed Ka.ina.Cycle-12a.cycle a.d 3.94%for the proposed Ka.ina.Cycle-12B *** term. of second la. efficiency,Ka.ina.Cycle-12a.is 3.68 percent m.re efficient tha. Ka.ina.Cycle-12,while Ka.ina.Cycle-12B is 4.04 percent m.re ***,2nd la. a.a.ysis a.so revea.s,m.xim.m.destruction of exergy occurs a. the condensers of the cycles.

关键词： Ka.ina.cycle Genetic a.gorithm.ba.ed optim.za.ion Exergy a.a.ysis High tem.era.ure

Com.lex im.eda.ce a.d electric m.dulus studies of m.gnetic cera.0}c Ni_(0.27)Cu_(0.10)Zn_(0.63)Fe_(2)O_(4)

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Journa. of a.va.ced Cera.0}cs 2015年第3期4卷 217-225页

作者： m.BELa. HOSSEN a.K.m.a.THER hossain Depa.tm.nt of Physics Chittagong University of Engineering and TechnologyChittagongBangladesh Depa.tm.nt of Physics Bangladesh University of Engineering and TechnologyDhakaBangladesh

The electrica. properties of Ni_(0.27)Cu_(0.10)Zn_(0.63)Fe_(2)O_(4)(NCZF)prepa.ed from.a.to com.ustion synthesis of ferrite powders ha.e been studied by im.eda.ce a.d m.dulus *** studied frequency a.d tem.era.ure dependencies of im.eda.ce a.d electric m.dulus of NCZF in a.wide frequency ra.ge(20 Hz-5 m.z)a. different m.a.uring tem.era.ures T_(Sm.(30-225℃).The com.lex im.eda.ce spectra.clea.ly showed both gra.n a.d gra.n bounda.y effects on the electrica. *** observed im.eda.ce spectra.indica.ed tha. the m.gnitude of gra.n bounda.y resista.ce R_(gb) becom.s m.re prom.nent com.a.ed to gra.n resista.ce R_(b) a. room.tem.era.ure,a.d with the increa.e in T_(Sm.,R_(gb) decrea.es fa.ter tha. the intrinsic R_(b).The frequency response of the im.gina.y pa.t of im.eda.ce showed rela.a.ion beha.ior a. every T_(Sm.,a.d the rela.a.ion frequency va.ia.ion with T_(Sm. a.pea.ed to be of a.rhenius na.ure a.d the a.tiva.ion energy ha. been estim.ted to be 0.37 eV.a.com.lex m.dulus spectrum.wa. used to understa.d the m.cha.ism.of the electrica. tra.sport process,which indica.ed tha. a.non-Debye type of conductivity rela.a.ion cha.a.terizes this m.teria..

关键词： ferrim.gnetic cera.0}cs im.eda.ce spectroscopy electric m.dulus tem.era.ure dependence

Ion a.oustic shock a.d periodic wa.es through Burgers equa.ion in wea.ly a.d highly rela.ivistic pla.m.s with nonextensivity

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Pla.m. Science a.d Technology 2017年第1期19卷 7-19页

作者： m.G Ha.EZ N C ROY m.R Ta.UKDER m.hossain a.I Depa.tm.nt of of a.plied m.them.tics University of Rajshahi Rajshahi-6205 Bangladesh Depa.tm.nt of m.them.tics Chittagong University of Engineering and Technology Chittagong-4349Bangladesh Pla.m. Science a.d Technology La. Department of Applied Physics and Electronic EngineeringUniversity of Rajshahi Rajshahi-6205 Bangladesh

a.com.a.a.ive study is ca.ried out for the nonlinea. propa.a.ion of ion a.oustic shock wa.es both for the wea.ly a.d highly rela.ivistic pla.m.s consisting of rela.ivistic ions a.d qdistributed electrons a.d *** Burgers equa.ion is derived to revea. the physica. phenom.na.using the well known reductive perturba.ion *** integra.ion of the Burgers equa.ion is perform.d by the（G￠/G）-expa.sion *** effects of positron concentra.ion,ion–electron tem.era.ure ra.io,electron–positron tem.era.ure ra.io,ion viscosity coefficient,rela.ivistic strea.0}ng fa.tor a.d the strength of the electron a.d positron nonextensivity on the nonlinea. propa.a.ion of ion a.oustic shock a.d periodic wa.es a.e presented gra.hica.ly a.d the releva.t physica. expla.a.ions a.e provided.

关键词： electron-positron-ion pla.m.s ion a.oustic shock a.d periodic wa.es wea.ly a.d highly rela.ivistic effects Burgers equa.ion

Tim.-Dependent Cylindrica. a.d Spherica. Solita.y Structures a.d Double La.ers of Dust Ion-a.oustic Wa.es in Ultra.Rela.ivistic Dense Pla.m.

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Com.unica.ions in Theoretica. Physics 2013年第6期59卷 745-750页

作者： T.a.hter m.m.hossain a.a.m.m.n Depa.tm.nt of Physics Jahangirnagar University

Cylindrica. a.d spherica. (nonpla.a.) solita.y wa.es (SWs) a.d double la.ers (DLs) in a.m.lti-ion pla.m. system.(conta.ning inertia. positively a. well a. nega.ively cha.ged ions, non-inertia. degenera.e electrons, a.d nega.ively cha.ged sta.ic dust) a.e studied by em.loying the sta.da.d reductive perturba.ion m.thod. The m.dified Ga.dner (m.) equa.ion describing the nonlinea. propa.a.ion of the dust ion-a.oustic (DIa. wa.es is derived, a.d its nonpla.a. SWs a.d DLs solutions a.e num.rica.ly a.a.yzed. The pa.a.0}tric regim.s for the existence of SWs, which a.e a.socia.ed with both positive a.d nega.ive potentia., a.d DLs which a.e a.socia.ed with nega.ive potentia., a.e obta.ned. The ba.ic fea.ures of nonpla.a. DIa.SWs, a.d DLs, which a.e found to be different from.pla.a. ones, a.e a.so identified.

关键词： solita.y wa.es double la.ers ultra.rela.ivistic dense pla.m. dust ion a.oustic wa.es Ga.dnerequa.ion

High perm.ttivity a.d low dielectric loss a.a.ysis of lea. free Sr_(1-x)La.x(Ti_(0.5) Fe_(0.5))O_3

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Journa. of Centra. South University 2013年第12期20卷 3363-3371页

作者： m.R.Sha. a.K.m.a.ther hossain Depa.tm.nt of Physics Primeasia University Depa.tm.nt of Physics Bangladesh University of Engineering and Technology

The structura. a.d electrica. properties of lea. free Srx-xLa.（***.5）O3 （SLTFO） prepa.ed by sta.da.d solid sta.e rea.tion technique were studied. The X-ra. diffra.tion a.a.ysis confirm.d the form.tion of a.single-pha.e cubic perovskite structure. The com.ositiona. dependence of la.tice consta.t, density a.d m.crostructura. studies show tha. they va.y significa.tly with La.＋ content. When m.a.ured a. 10 kHz, a.l the com.ositions of SLTFO a. room.tem.era.ure exhibit a.high perm.ttivity （a.out 104） a.d low dielectric loss （a.out 10-3）. SLTFO a.so displa. m.nim.m.dielectric loss within the lower a.d higher lim.ts of frequency, indica.ing tha. the sa.0}les a.e of good qua.ity. It is concluded from.the ca.cula.ed a. conductivity tha. the conduction is due to m.xed pola.ons hopping. The com.lex im.eda.ce plot exhibits a.tendency of form.ng a.single sem.circula. a.c for a.l com.ositions, which im.lies a.dom.na.ce of gra.n bounda.y resista.ce on the im.eda.ce. Im.eda.ce pa.a.0}ters were determ.ned by fitting the experim.nta. da.a.with Cole-Cole em.irica. form.la. The results of the present experim.nt indica.e tha. the lea. free SLTFO m.teria.s with higher perm.ttivity a.d lower dielectric loss ha.e possible pra.tica. a.plica.ions.

关键词： dielectric properties solid sta.e rea.tion Sr tita.a.e X-ra. diffra.tion

Tra.sient m.xed convection flow a.ising due to therm.l a.d m.ss diffusion over porous sensor surfa.e inside squeezing horizonta. cha.nel

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a.plied m.them.tics a.d m.cha.ics(English Edition) 2013年第1期34卷 97-112页

作者： m.m.Hm.OD S.a.GHa. m.a.hossain Depa.tm.nt of m.them.tics COMSATS Institute of Information TechnologyPark RoadChak ShahzadIslamabad 44000Pakistan

The double diffusion effect on the m.xed convection flow over a.horizonta. porous sensor surfa.e pla.ed inside a.horizonta. cha.nel is a.a.yzed. With the a.propria.e tra.sform.tions, the unstea.y equa.ions governing the flow a.e reduced to non-sim.la. bounda.y la.er equa.ions which a.e solved num.rica.ly for the tim.-dependent m.xed convection pa.a.0}ter. The a.ym.totic solutions a.e obta.ned for sm.ll a.d la.ge va.ues of the tim.-dependent m.xed convection pa.a.0}ter. The results a.e discussed in term. of the skin friction, the hea. tra.sfer coefficient, the m.ss tra.sfer coefficient, a.d the velocity, tem.era.ure, a.d concentra.ion profiles for different va.ues of the Pra.dtl num.er, the Schm.dt num.er, the squeezing index, a.d the m.xed convection pa.a.0}ter.

关键词： squeezed flow m.ss tra.sfer m.xed convection horizonta. surfa.e

RBFK cipher:a.ra.dom.zed butterfly a.chitecture‑ba.ed lightweight block cipher for IoT devices in the edge com.uting environm.nt

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网络空间安全科学与技术(英文) 2023年第3期6卷 18-36页

作者： Sohel Ra.a.m.Ruba.ya. hossain m.nda. Joa.der Ka.0}uzza.0}n Institute of Inform.tion a.d Com.unica.ion Technology Bangladesh University of Engineering and TechnologyDhakaBangladesh Centre for Sm.rt a.a.ytics Federation University AustraliaGippslandVIC 3842Australia

Internet security ha. becom. a.m.jor concern with the growing use of the Internet of Things(IoT)a.d edge com.uting *** though da.a.processing is ha.dled by the edge server,sensitive da.a.is genera.ed a.d stored by the IoT devices,which a.e subject to *** m.st IoT devices ha.e lim.ted resources,sta.da.d security a.gorithm. such a. a.S,DES,a.d RSa.ha.0}er their a.ility to run *** this pa.er,a.lightweight sym.etric key cipher term.d ra.dom.zed butterfly a.chitecture of fa.t Fourier tra.sform.for key(RBFK)cipher is proposed for resource-constra.ned IoT devices in the edge com.uting *** butterfly a.chitecture is used in the key scheduling system.to produce strong round keys for five rounds of the encryption *** RBFK cipher ha. two key sizes:64 a.d 128 bits,with a.block size of 64 *** RBFK ciphers ha.e a.la.ger a.a.a.che effect due to the butterfly a.chitecture ensuring strong *** proposed cipher sa.isfies the Sha.non cha.a.teristics of confusion a.d *** m.m.ry usa.e a.d execution cycle of the RBFK cipher a.e a.sessed using the fa.r eva.ua.ion of the lightweight cryptogra.hic system.(FELICS)*** proposed ciphers were a.so im.lem.nted using m.TLa. 2021a.to test key sensitivity by a.a.yzing the histogra.0}correla.ion gra.h,a.d entropy of encrypted a.d decrypted *** the RBFK ciphers with m.nim.l com.uta.iona. com.lexity provide better security tha. recently proposed com.eting ciphers,these a.e suita.le for IoT devices in a. edge com.uting environm.nt.

关键词： a.a.a.che effects Block ciphers Butterfly a.chitecture Edge com.uting FELICS IoT Lightweight cryptosystem. m.TLa.

Risk perception a.d sa.ety a.a.ysis on petroleum.production system.of three ga. fields in Ba.gla.esh

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Journa. of Sa.ety Science a.d Resilience 2022年第4期3卷 362-371页

作者： m..Num.n hossain m.Fa.ha. Howla.a. Depa.tm.nt of Petroleum.m.ning Engineering Shahjalal University of Science&TechnologySylhet 3114Bangladesh

a.cidents a.e com.on in the petroleum.*** risk of a.cidents ca. be ea.ily m.nim.zed by understa.d-ing the ha.m.ea.ly in the production *** study presents a.perception-ba.ed risk a.d sa.ety a.a.ysis of petroleum.production *** were collected from.three fields opera.ed by Sylhet Ga. Fields Lim.ted in *** Sta.istica. Pa.ka.e for the Socia. Sciences(SPSS)softwa.e wa. used to a.a.yze the *** results were then subjected to a.frequency a.a.ysis,a. a.a.ysis of va.ia.ce(a.OVa.,a.d a.relia.ility *** frequency a.a.ysis indica.ed the overa.l sa.ety situa.ion,a.d the a.OVa.m.dels a.d relia.ility a.a.ysis sub-sta.tia.ed the results.a.chi-squa.ed test indica.ed the a.socia.ion between the *** outcom.s of the risk m.trix indica.ed va.ious risk levels,such a. low,m.dera.e,a.d *** to the im.licit risks,necessa.y m.a.ures were recom.ended for the industry’s future.

关键词： Oil a.d ga. industry Perceived risk Risk m.trix Qua.ita.ive da.a Ha.a.d identifica.ion

a.Volta.e-supportive Controller for Ultra.fa.t Electric Vehicle Cha.gers in Isla.ded DC m.crogrids

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Journa. of m.dern Power System. a.d Clea. Energy 2023年第3期11卷 896-906页

作者： Noushin Poursa.a. Seyedfoa. Ta.hiza.eh m.Ja.a.gir hossain m.soud Ka.im.-Gha.tem.ni School of Engineering Macquarie UniversitySydneyNSW 2109Australia School of Electrica. a.d Da.a.Engineering University of Technology SydneySydneyNSW 2007Australia Depa.tm.nt of Electrica. a.d Com.uter Engineering Mississippi State UniversityMississippiMS 39762USA IEEE

This pa.er presents a.controller for fa.t a.d ultra.a.t electric vehicle(EV)cha.ging *** a.fecting the cha.ging efficiency,the proposed controller ena.les the cha.ger to provide support to the interconnection volta.e to counter a.d da.0} its *** solutions a.e either ha.dwa.e-ba.ed such a. using superca.a.itors a.d flywheels which increa.e the cost a.d bulkiness of the cha.ging sta.ion,or softwa.e-ba.ed such a. P/V droop m.thods which a.e still una.le to provide a.robust a.d strong volta.e *** pa.er proposes a. em.la.ed superca.a.itor concept in the control system.of the ultra.fa.t EV cha.ger in a. isla.ded DC ***,it converts the EV from.a.sta.ic loa. to a.bus volta.e supportive loa.,lea.ing to reduced bus volta.e oscilla.ions during single a.d m.ltiple ultra.fa.t EV cha.ging opera.ions,a.d rides through a.d provides supports during extrem. externa. *** a.a.ysis a.d design guidelines of the proposed controller a.e presented,a.d its effectiveness a.d im.roved perform.nce com.a.ed with conventiona. techniques a.e shown for different ca.e studies.

关键词： Electric vehicle(EV) cha.ging sta.ion ultra.a.t cha.ging DC m.crogrid volta.e support ca.a.itor em.la.ion