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Nonvola.ile wa.eguide tra.sm.ssion tuning with electrica.ly-driven ultra.sm.ll GST pha.e-cha.ge m.teria.

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Science Bulletin 2019年第11期64卷 782-789页

作者： Ha.yu Zha.g Linjie Zhou Jia. Xu Ningning Wa.g Ha. Hu Lia.gjun Lu B. m. a. rahman Jia.ping Chen Sta.e Key La.ora.ory of a.va.ced Optica. Com.unica.ion System. a.d Networks Shanghai Key Laboratory of Navigation and Location ServicesShanghai Institute for Advanced Communication and Data ScienceDepartment of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Depa.tm.nt of Electrica. a.d Electronic Engineering CityUniversity of LondonLondon EC IV OHBUK

Low-power reconfigura.le optica. circuits a.e highly dem.nded to sa.isfy a.va.iety of different a.plica.ions. Conventiona. electro-optic a.d therm.-optic refra.tive index tuning m.thods in silicon photonics a.e not suita.le for reconfigura.ion of optica. circuits due to their high sta.ic power consum.tion a.d vola.ility. We propose a.d dem.nstra.e a.nonvola.ile tuning m.thod by utilizing the reversible pha.e cha.ge property of GST integra.ed on top of the silicon wa.eguide. The pha.e cha.ge is ena.led by a.plying electrica. pulses to the lm.sized GST a.tive region in a.sa.dwich structure. The experim.nta. results show tha. the optica. tra.sm.ssion of the silicon wa.eguide ca. be tuned by controlling the pha.e sta.e of GST.

关键词： Pha.e cha.ge m.teria. Nonvola.ile optica. switch Integra.ed optics devices Cha.cogenide Ge2Sb2Te5

Determ.na.ion of the m.ta.ta.le Zone Width, Nuclea.ion Kinetics, Structura. a.d Optica. Properties of KCl Doped Ka. Crysta.

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Journa. of Crysta.liza.ion Process a.d Technology 2015年第2期5卷 31-42页

作者： m. a. rahman m. m. rahman Depa.tm.nt of Ba.ic Sciences a.d Hum.nities (Physics) University of Asia Pacific Dhaka Bangladesh Depa.tm.nt of physics Dhaka University Dhaka Bangladesh

Slow eva.ora.ion m.thod wa. used to grow pure a.d KCl (10 m.l%) doped Ka. single crysta.. The solubility a.d m.ta.ta.le zone width of a.ueous solutions of pure a.d KCl (10 m.l%) doped Ka. crysta. were eva.ua.ed to a.a.yze the crysta.liza.ion process. m.a.uring the induction period τ, the critica. nuclea.ion pa.a.0}ters like interfa.ia. energy (σ), energy of form.tion of the critica. nucleus (ΔG*) were determ.ned using the cla.sica. theory of nuclea.ion. The structura. properties a.d optica. consta.ts of the grown crysta.s ha.e been put to test a.d observed tha. the a.dition of KCl results in a. enha.cem.nt of properties of the crysta.. Grown crysta.s were cha.a.terized by powder X-ra. diffra.tion. FTIR spectra.confirm.d the presence of KCl in pure Ka. crysta.. UV- Visible spectroscopic studies revea.ed tha. a.dition of KCl in pure Ka. crysta. increa.ed tra.spa.ency from.75% to 80%. The a.a.ysis of the optica. a.sorption da.a.revea.ed the presence of both indirect a.d direct tra.sitions a.d both of these ba.d ga.s increa.ed with the a.dition of KCl. The tra.sm.tta.ce da.a.wa. a.a.yzed to ca.cula.e the refra.tive index, oscilla.or energy, dispersion energy, electric susceptibility, zero-frequency dielectric consta.t a.d both the rea. a.d im.gina.y pa.ts of the dielectric perm.ttivity a. a.function of photon energy. The m.m.nts of ε(E) were a.so determ.ned. The dispersion i.e. spectra. dependence of the refra.tive index wa. discussed a.cording to the single-effective oscilla.or m.del proposed by Wem.le a.d DiDom.nico.

关键词： Single Crysta. Growth from Solution m.ta.ta.le Zone Width FTIR UV-Visible Spectroscopy Optica. Consta.ts

a.Novel a.proa.h of Dyeing Jute Fiber with Rea.tive Dye a.ter Trea.ing with Chitosa.

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Open Journa. of Orga.ic Polym.r m.teria.s 2013年第4期3卷 87-91页

作者： m. a. rahman Bhuiya. a.u Sha.d m. m. Ba.ha. P. Ha.ue m. a. Ha.na. Depa.tm.nt of a.plied Chem.stry a.d Chem.ca. Engineering University of Dhaka Dhaka Bangladesh Depa.tm.nt of Textile Engineering Dhaka University of Engineering and Technology Gazipur Bangladesh Depa.tm.nt of Textile Engineering Dhaka University of Engineering and Technology Gazipur Bangladesh Depa.tm.nt of a.plied Chem.stry a.d Chem.ca. Engineering University of Dhaka Dhaka Bangladesh Depa.tm.nt of Textile Engineering Mawlana Bhashani Science and Technology University Tangail Bangladesh

Jute is genera.ly not dyed with rea.tive dye though it is a.cellulosic fiber. Rea.tive dye is extensively used to dye cotton, viscose a.d other cellulosic fibers wherea. jute is dyed with ba.ic dye. This pa.er presents a.novel a.proa.h to dye the jute fiber with rea.tive dye a.ter trea.ing with chitosa.. Jute fa.ric wa. trea.ed with chitosa. solution a. different con- centra.ions (0.5%, 1%, 2%, 3% a.d 4%) a.d then dyed with rea.tive dye. The depth a.d fa.tness of sha.e of dyed fa.ric were a.a.yzed by com.a.ing the chitosa. trea.ed sa.0}les with untrea.ed dyed fa.ric sa.0}les. It ha. been found tha., the dyeba.h exha.stion is increa.ed with the increm.nt of chitosa. concentra.ions. The exha.stion percenta.es ha.e found 36.79%, 41.59%, 48.33%, 54.46% a.d 58.75% for the fa.ric trea.ed with 0.5%, 1%, 2%, 3% a.d 4% chitosa. solution respectively, while the exha.stion of dyeba.h is only 23.15% for untrea.ed fa.ric. The K/S va.ues (a. λm.x = 540 nm. of dyed sa.0}les ha.e found 4.93, 6.77, 10.5, 14.07, 15.57 a.d 2.37 for 0.5%, 1%, 2%, 3%, 4% a.d untrea.ed fa.ric respectively. The color fa.tness to wa.hing a.d rubbing of the dyed fa.rics wa. a.so eva.ua.ed. In ca.e of dry rubbing, both types of fa.ric ha.e shown a.m.st sim.la. fa.tness ra.ings. However, chitosa. trea.ed fa.rics ha.e shown inferior fa.tness ra.ing in ca.e of wet rubbing a.d wa.hing, pa.ticula.ly for the fa.rics a. higher chitosa. concentra.ions.

关键词： Chitosa. Dyeing Jute Fiber Rea.tive Dye

Im.ge Noise a.a.ysis of a.La.ge Ring PET Sca.ner

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Interna.iona. Journa. of m.dica. Physics, Clinica. Engineering a.d Ra.ia.ion Oncology 2017年第2期6卷 208-215页

作者： m. m. a.a.a. S. a.ter R. Kha.un m. F. Uddin a. N. m.nika.m. a. rahman m. N. Kha.a. Institute of Nuclea. m.dica. Physics AERE Savar Bangladesh m.dica. Physics Division Atomic Energy Centre Dhaka Bangladesh Infertility Unit Department of Gynae & Obs BSMMU Dhaka Bangladesh

Im.ge noise a.a.ysis of a.la.ge ring PET sca.ner “m.cro PET” perform.d using two different pha.tom., na.0}ly a.Ja.zcza. SPECT pha.tom.a.d a.uniform.cylindrica. pha.tom. In the present work, sim.le 2D filtered ba.k projection wa. used to reconstruct a.l the im.ges, a.d in a.m.st a.l the ca.es a.Ha.0}ing filter of cutoff frequency 0.4 a.d a.256 by 256 m.trix with zoom.fa.tors from.1 to 4 were used in order to investiga.e the im.ging ca.a.ilities of the new sca.ner a.d the influence of filter a.d cut-off frequency on the filtered ba.k projected im.ges. Results indica.e tha. 11.1 m. cold rod in the Ja.zcza. pha.tom.im.ges ca. consistently be seen. The Coefficient of va.ia.ion (CV) results for Ha.n a.d Ha.0}ing filters a.e very sim.la. a.d increa.e a.proxim.tely in linea. fa.hion with higher cutoff frequency. The va.ue of CV for the Pa.sen filter is lower tha. the va.ue for Ha.n a.d Ha.0}ing filters. It concludes tha. a.l filters with low cut off-frequency (0.6) would suppress im.ge noise but decrea.e contra.t.

关键词： PET Sinogra. Filter & CV

Study of Im.ge Contra.t Recovery Coefficient (CRC) of a.La.ge Ring PET Sca.ner

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Interna.iona. Journa. of m.dica. Physics, Clinica. Engineering a.d Ra.ia.ion Oncology 2019年第1期8卷 46-56页

作者： m. m. a.a.a. S. a.ter R. Kha.un m.F. Uddin m. R. Isla.0}H. m. Ja.0}l a. N. m.nika.m. a. rahman R. P. Da. m. m. rahman R. a. Sha.m.n m. N. Kha.a. Institute of Nuclea. m.dica. Physics AERE Bangladesh Atomic Energy Commission Dhaka Bangladesh a.om.c Energy Centre Bangladesh Atomic Energy Commission Dhaka Bangladesh Infertility Unit Department of Gynaecology & Obstetrics Bangabandhu Sheikh Mujib Medical University Dhaka Bangladesh

Im.ge contra.t recovery coefficient (CRC) of a.la.ge ring PET sca.ner “m.croPET” wa. studied with septa.a.d without septa.configura.ion by a.-quiring da.a.from.a.la.ora.ory m.de 35.7 cm.squa.e pha.tom.filled with 18-F. Im.ges were reconstructed with sim.le 2D filtered ba.k projection using Ha.n, Ha.0}ing a.d Pa.sen filters with different cut-off frequencies a.m.ng to investiga.e the influence of filter a.d cut-off frequency on im.ge contra.t with septa.a.d without septa.m.de. Results indica.e tha. the CRC, for both hot a.d cold lesions, is excellent for dia.0}ters ≥ 3 cm.using cut-off frequencies > 0.4. For a.2 cm.hot lesion CRC is a.ound 0.8 to 0.9. CRC for 1 cm.hot a.d cold lesions is ~0.3, a. expected. There is surprisingly little difference between results with a.d without septa. For hot lesions, septa.a.pea. to im.rove CRC slightly, but for cold lesions CRC is slightly poorer using septa.

关键词： PET Filter Septa & CRC

Perform.nce Eva.ua.ion of a.DS-CDm. System.in a.Ra.leigh Fa.ing Environm.nt

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World Journa. of Engineering a.d Technology 2016年第1期4卷 1-9页

作者： m. a. rahman m. m. a.a.1}m.. Kha.id Hossa.n m.. Kha.rul Isla.1}Kha. m. Na.ir Uddin m.. Sha.inuzza.1}n Depa.tm.nt of a.plied Physics Electronics & Communication Engineering Islamic University Kushtia Bangladesh Institute of Electronics Atomic Energy Research Establishment Savar Bangladesh

This work represents the perform.nce eva.ua.ion of DS-CDm. in a.Ra.leigh fa.ing environm.nt. Perform.nce a.a.ysis wa. ca.ried out for a.DS-CDm. system.to eva.ua.e the signa.-to-noise ra.io (SNR), signa.-to-interference ra.io (SIR) a.d bit error ra.e (BER) for different m.dula.ion schem.s like a.K, PSK a.d FSK. Results were eva.ua.ed a. different da.a.ra.es a.d were presented in term. of SNR, SIR a.d BER. Com.uter sim.la.ion wa. a.so ca.ried out by using m.tla. to eva.ua.e the signa. wa.eform. with a.d without a.dition white Ga.ssia. noise (a.GN). Butterworth filtered wa.eform.wa. given to get better signa. qua.ity. Decoded output wa.eform. were a.so eva.ua.ed to confirm.the sim.la.ion.

关键词： DS-CDm. Ra.leigh Fa.ing Perform.nce a.a.ysis SNR BER a.K PSK FSK m.TLa. a.GN

Effect of Ethylene Ca.bona.e (EC) Pla.ticizer on Poly (Vinyl Chloride)-Liquid 50% Epoxidised Na.ura. Rubber (LENR50) Ba.ed Polym.r Electrolyte

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m.teria.s Sciences a.d a.plica.ions 2011年第7期2卷 817-825页

作者： m. Y. a. rahman a. a.m.d T. K. Lee Y. Fa.ina.H. m. Da.la. 不详

In this resea.ch, new thin film.of a.free sta.ding electrolyte film.conta.ning poly(vinyl) chloride (PVC), 50% liquid epoxidized na.ura. rubber (LENR50), Ethylene ca.bona.e (EC) blends a. a.host for the electrolyte which wa. doped with lithium.perchlora.e (LiClO4) a. the dopa.t sa.t wa. successfully prepa.ed with solution ca.ting technique. The polym.r electrolyte of PVC-LENR50-EC-LiClO4 wa. cha.a.terized using im.eda.ce spectroscopy (EIS), sca.ning electron m.croscopy (SEm. a.d Fourier tra.sform.infra.ed (a.R-FTIR). From.the EIS results shows tha. electrolyte exhibited the highest ionic conductivity of 2.1 × 10–7 S●cm.1 a. the 30 wt.% of LiClO4. The ionic conductivity result wa. supported by the m.rphologica. studies which revea.ed the good hom.geneity of the PVC-LENR50-EC blends a. no pha.e sepa.a.ion wa. observed. The sm.oth surfa.e ca. ea.e the m.bility of ions in the system.com.lexes. In a.dition, the form.tion of m.cro-pores by introducing lithium.sa.ts to the electrolyte a.so im.roved the tra.sporta.ion properties of L+ ions in the electrolyte system.a.d hence im.roving its ionic conductivity. The fea.ures of com.lexa.ion of the electrolytes were studied by a.R-FTIR.

关键词： PVC LENR50 LiClO4 Ionic Conductivity Polym.rs Electrolyte EC

Effects of surfa.e finish a.d trea.m.nt on the fa.igue beha.iour of vibra.ing cylinder block using frequency response a.proa.h

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Journa. of Zhejia.g University-Science a.a.plied Physics & Engineering) 2006年第3期7卷 352-360页

作者： rahman m. m. a.IFFIN a. K. Com.uta.iona. a.d Experim.nta. m.cha.ics Group Department of Mechanical and Materials Engineering Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor DE Malaysia

This pa.er presents the effects of surfa.e finish a.d trea.m.nt on the high cycle fa.igue beha.iour of vibra.ing cylinder block of a.new two-stroke free piston engine a. com.lex va.ia.le a.0}litude loa.ing conditions using frequency response a.proa.h. Finite elem.nt m.delling a.d frequency response a.a.ysis wa. conducted using finite elem.nt a.a.ysis softwa.e Pa.ka.e ***/*** a.d fa.igue life prediction wa. ca.ded out using *** softwa.e. Ba.ed on the finite elem.nt results, different frequency response a.proa.h wa. a.plied to predict the cylinder block fa.igue life. Results for different loa. histories a.d m.teria. com.ina.ions a.e a.so discussed. Results indica.ed grea. effects for a.l surfa.e finish a.d trea.m.nt. It is concluded tha. polished a.d ca.t surfa.e finish conditions give the highest a.d lowest cylinder block lives, respectively; a.d tha. Nitrided trea.m.nt lea.s to longest cylinder block life. The results were used to dra. contour plots of fa.igue life a.d da.0}ge in the worst or m.st da.0}ging ca.e.

关键词： Finite elem.nt m.thod Fa.igue life Surfa.e finish Surfa.e trea.m.nt Frequency response a.proa.h

Cyber-Physica.-Socia. System.Between a.Hum.noid Robot a.d a.Virtua. Hum.n Through a.Sha.ed Pla.form.for a.a.tive a.ent Ecology

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IEEE/Ca. Journa. of a.tom.tica.Sinica 2018年第1期5卷 190-203页

作者： S. m. m.za.oor rahman Depa.tm.nt of m.cha.ica. Engineering College of Engineering and Sciences Clemson University SC 29634 USA IEEE

Two a.tificia. a.ents(a.hum.noid robot a.d a.virtua. hum.n) a.e enriched with va.ious sim.la. intelligence,a.tonom., functiona.ities a.d intera.tion m.da.ities. The a.ents a.e integra.ed in the form.of a.cyber-physica.-socia. system.CPSS) through a.sha.ed com.unica.ion pla.form.to crea.e a.socia. ecology. In the ecology, the a.ents colla.ora.e(a.sist ea.h other) to perform.a.rea.-world ta.k(sea.ch for a.hidden object)for the benefits of hum.ns. a.robot-virtua. hum.n bila.era. trust m.del is derived a.d a.rea.-tim. trust m.a.urem.nt m.thod is developed. The role of ta.ing initia.ive in the colla.ora.ion is switched between the a.ents following a.finite sta.e m.chine m.del triggered by bila.era. trust, which results in a.m.xedinitia.ive colla.ora.ion. a.schem. is developed to eva.ua.e the perform.nce of the a.ents in the ecology through the *** results show tha. the robot a.d the virtua. hum.n perform.sa.isfa.torily in the colla.ora.ion through the CPSS. The results thus prove the effectiveness of the rea.-world ecology between a.tificia. a.ents of heterogeneous rea.ities through a.sha.ed pla.form.ba.ed on trust-triggered m.xed-initia.ives. The results ca. help develop a.a.tive socia. ecology com.rising intelligent a.ents of heterogeneous rea.ities to a.sist hum.ns in va.ious ta.ks through colla.ora.ion between the a.ents in the form.of a.CPSS.

关键词： a.a.tive a.ent ecology a.sisted living cyberphysica.-socia. system.CPSS) hum.noid robot(HR) sm.rt hom.s socia. intera.tion virtua. hum.n(VH) sha.ed pla.form trust