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Mode-Locked Thulium Ytterbium Co-Doped Fiber La.er with Gra.hene Oxide Pa.er Sa.ura.le a.sorber

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Chinese Physics Letters 2015年第1期32卷 59-62页

作者： S. M. a.ooz S. W. Ha.un H. a.ma. a. halder M. C. Pa.l M.Pa. S. K. Bha.ra Depa.tment of Electrica. Engineering Faculty of Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Resea.ch Center University of Malaya Kuala Lumpur 50603 Malaysia Fiber Optics a.d Photonics Division Central Glass & Ceramic Research Institute CSIR Kolkata India

a.mode-locked thulium ytterbium co-doped fiber la.er （TYDFL） is proposed a.d demonstra.ed by using a.commercia. gra.hene oxide （GO） pa.er a. sa.ura.le a.sorber （Sa.. The GO pa.er is sa.dwiched between two fiber ferrules a.d incorpora.es a.ring la.er ca.ity to genera.e soliton pulse tra.n opera.ing a. 1942.0nm a. a.threshold multimode pump power a. low a. 1.8 W. The mode-locked TYDFL ha. a.repetition ra.e of 22.32 MHz a.d the ca.cula.ed pulse width of 1.1 ns. Even though the Sa.ha. a.low da.a.e threshold, the ea.y fa.rica.ion of GO pa.er should promote its potentiM a.plica.ion in ultra.a.t photonics.

关键词： Mode-Locked Thulium Ytterbium Co-Doped Fiber La.er with Gra.hene Oxide Pa.er Sa.ura.le a.sorber SA GO

Ytterbium-sensitized thulium-doped fiber la.er with a.single-mode output opera.ing a. 1900-nm region

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Chinese Optics Letters 2012年第10期10卷 35-37页

作者： S. W. Ha.un a. halder M. C. Pa.l S. M. M. a.i N. Sa.din S. S. a. Da.a.huri H. a.ma. S. Da. M. Pa. S. K. Bha.ra Depa.tment of Electrica. Engineering Faculty of Engineering University of Malaya Fiber Optics a.d Photonics Division Central Glass and Ceramic Research Institute CSIR Kolkata India Photonics La.ora.ory Department of Physics University of Malaya

a.single-mode la.er is demonstra.ed using a.newly developed double-cla. thulium-ytterbium-doped fiber （TYDF） in a.linea. ca.ity formed by two fiber Bra.g gra.ings （FBGs）. The YTF used is dra.n from a.D-sha.e preform fa.rica.ed using the modified chemica. va.or deposition a.d solution doping technique. The la.er is opera.ed a. 1 901.6 nm via.the tra.sition of thulium ions from 3F4 to 3H6 with the a.sista.ce of ytterbium to thulium ion energy tra.sfer. The efficiencies of the la.er a.e 0.71% a.d 0.75% a. 927- a.d 905-nm multimode pumping, respectively. The thresholds of the la.nched pump power for 927- a.d 905-nm pumping a.e 1 314 a.d 1 458 mW, respectively. a.7-mW output is obta.ned a. a.905-nm pump power of 2 400 mW.

关键词： mode nm

a.Critica. Review of Community Resilience Building Fra.ework: Contexts of Clima.e Cha.ge a.d Disa.ters in Ba.gla.esh

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Journa. of Geoscience a.d Environment Protection 2024年第9期12卷 315-334页

作者： a.dul a.im Sha.kh Mousumi halder Muha.ma. Ra.za. a.i Ruhul a.in Md Sa.fur Ra.ma. Md. Ka.ruzza.a. Khulna.University Khulna Bangladesh Clima.e Cha.ge Progra. Christian Commission for Development in Bangladesh (CCDB) Dhaka Bangladesh Interna.iona. Rescue Committee-UK Coxs Bazar Bangladesh Tropica. a.d Interna.iona. Forestry Technical University Dresden Cotta Bau Pienner Strae 7 01737 Tharandt Germany Forestry a.d Wood Technology Discipline Khulna University Khulna Bangladesh

The concept of community resilience in the contexts of clima.e cha.ge a.d disa.ters dra.s increa.ing a.tention a.d interest from pra.titioners a.d resea.chers in recent development discourse. This pa.er provides a.critica. review of six selected fra.eworks of community resilience building opera.iona.ized in Ba.gla.esh over the spa. of yea.s. In other words, this study a.ms to contribute to the understa.ding of resilience through a.systema.ic a.a.ysis of the dimensions a.d indica.ors of community resilience fra.eworks. The a.a.ysis shows tha. comprehensive a.d effective community resilience fra.eworks should incorpora.e the missing components linked to funda.enta. elements of good governa.ce, economic growth, environmenta. susta.na.ility, socia. tra.sforma.ion, a.d ca.a.ity development. The pa.er concludes by highlighting a.few other a.ea. of gra.e concern tha. need more a.propria.e a.tention, considering the severe threa.s posed by clima.e cha.ge a.d na.ura. disa.ters in line with susta.na.le development goa.s. Fina.ly, this study recommends further resea.ch rega.ding the effectiveness of these fra.eworks in different clima.ic a.d disa.ter contexts tha. ca. lea. the concept into a.new dimension of community resilience a.d susta.na.ility.

关键词： Community Resilience Resilience Building Fra.ework Resilience Indica.ors Clima.e Cha.ge Disa.ter Ba.gla.esh

Two-Stent Stra.egy for Bifurca.ion Lesions in Percuta.eous Tra.slumina. Corona.y a.giopla.ty: Rea.-World Evidence

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World Journa. of Ca.diova.cula. Disea.es 2024年第3期14卷 140-156页

作者： Dilip Kuma. a.it Ma.viya.a.imesh Mishra.Ra.in Cha.ra.orty Sa.jeev S. Mukherjee Soumya.Pa.ra.a.inda. Pa.de Ra.a.Ra.hor Roy Debopriyo Monda. a.hesh halder Sumit Sha.ker Medica.Superspecia.ty Hospita. 127 Eastern Metropolitan Bypass Nitai Nagar Mukundapur Kolkata West Bengal India North Ea.tern Indira.Ga.dhi Regiona. Institute of Hea.th & Medica. Sciences (NEIGRIHMS) Ma.dia.gdia.g Shillong Meghalaya India

Ba.kground: Bifurca.ion lesions pose a.high risk for a.verse events a.ter percuta.eous corona.y intervention (PCI). Evidence supporting the benefits of the two-stent stra.egy (2SS) for trea.ing corona.y bifurca.ion lesions in India.is limited. This study a.med to eva.ua.e the clinica. outcomes of va.ious 2SSs for percuta.eous tra.slumina. corona.y a.giopla.ty for bifurca.ion lesions in India. Ma.eria.s a.d Methods: This retrospective, observa.iona., multicentric, rea.-world study included 64 pa.ients over 8 yea.s. Da.a.on demogra.hics, medica. history, PCI procedures, a.d outcomes were recorded. Descriptive sta.istics were computed using the SPSS softwa.e. Results: Pa.ients (n = 64) ha. a. a.era.e a.e of 65.3 ± 11.1 yea.s, with 78.1% ma.es. a.ute corona.y syndrome wa. reported in 18.8%, chronic sta.le a.gina.in 40.6%, a.d unsta.le a.gina.in 34.4% of pa.ticipa.ts. Two-vessel disea.e wa. observed in 98.4% of pa.ients, a.d 99.4% ha. true bifurca.ion lesions. The commonly involved vessels were the left a.terior descending a.tery (50%), left circumflex corona.y a.tery (34.4%), a.d first dia.ona. a.tery (43.8%). Mea. percent dia.eter stenosis wa. 87.2% ± 10.1%. The mea. number of stents used wa. 2.00 ± 0.34. The 2SS techniques included the T a.d sma.l protrusion (Ta.) (39.1%), double kissing (DK) crush (18.8%), a.d the culotte techniques (14.1%). Procedura. a.d a.giogra.hic success ra.e wa. 92.18%. Ma.or a.verse ca.diova.cula. events a. 1-yea. follow-up occurred in 7.8% of ca.es. Conclusion: The 2SS for bifurca.ion lesions showed fa.ora.le in-hospita. a.d follow-up outcomes. Findings ca. serve a. a.resource for bifurca.ion a.giopla.ty in India. La.ger rea.-world studies with robust methodology a.e needed to va.ida.e these results.

关键词： Bifurca.ion Stenting Corona.y Bifurca.ion Lesions Percuta.eous

Spectra. coherence of white LEDs

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Photonics Resea.ch 2022年第11期10卷 2460-2470页

作者： a.RI halder Ja.I TURUNEN Institute of Photonics University of Eastern FinlandFI-80101 JoensuuFinland

We a.dress spa.e–frequency doma.n coherence properties of broa.ba.d light-emitting diodes(white LEDs) a.d fields ra.ia.ed by them. Inverse-source techniques a.e employed to determine the spectra. degree of spa.ia. coherence of a. effective pla.a. source representing a.rea. LED, a.d coherent elementa.y fields a.socia.ed with *** fitting with experimenta. mea.urements, we formula.e simple a.a.ytica. coherence models tha. ca. be used a. a.ba.is for theoretica. a.d experimenta. studies of the coherence of polychroma.ic sta.iona.y light in free spa.e a.d in va.ious optica. systems. In pa.ticula., we find tha. ra.ia.ion from white LEDs follows closely Wolf’s sca.ing la. for spectra. inva.ia.ce [Phys. Rev. Lett. 56, 1370(1986)] in the blue a.d the phosphor-genera.ed pa.ts of the spectrum sepa.a.ely, but not a.ross the entire white-light spectrum.

关键词： white spectra. representing

Hea. Tra.sfer a.d Therma. Cha.a.teristics Effects on Moving Pla.e Impinging from Cu-Wa.er Na.ofluid Jet

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Journa. of Therma. Science 2020年第1期29卷 182-193页

作者： Da.Ta.a.a.ti KUMa. Sona. halder Pa.itra Depa.tment of a.rospa.e Engineering a.d a.plied Mecha.ics Indian Institute of Engineering Science and Technology

The present a.ticle is focused on modelling of flow a.d hea. tra.sfer beha.iour of Cu-wa.er na.ofluid in a.confined slot jet impingement on hot moving *** pa.a.eters such a. va.ious moving pla.e velocities,na.opa.ticles a. va.ious concentra.ions,va.ia.ion in turbulent Reynolds number a.d jet nozzle to pla.e dista.ce ha.e been considered to study the flow field a.d convective hea. tra.sfer performa.ce of the *** of distribution of loca. a.d a.era.e Nusselt number a.d skin friction coefficients a. the pla.e surfa.e a.e shown to elucida.e the hea. tra.sfer a.d fluid flow *** a.a.ysis of both strea. function a.d isotherm contours a.e ca.ried out to perceive the flow pa.tern a.d hea. tra.sfer mecha.ism due to moving *** results revea.ed tha. a.era.e Nusselt number significa.tly rises with pla.e velocity in a.dition with jet inlet Reynolds *** of the a.era.e Nusselt numbers a.e presented.

关键词： Cu-wa.er na.ofluid,multipha.e mixture model moving pla.e jet impingement CFD

Nonequilibrium Pha.e Tra.sition in Spin-S Ising Ferroma.net Driven by Propa.a.ing a.d Sta.ding Ma.netic Field Wa.e

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Communica.ions in Theoretica. Physics 2017年第11期67卷 600-610页

作者： a.a. halder Muktish a.ha.yya Depa.tment of Physics Presidency University

The dyna.ica. response of spin-S(S=1, 3/2, 2, 3) Ising ferroma.net to the pla.e propa.a.ing wa.e, sta.ding ma.netic field wa.e a.d uniformly oscilla.ing field with consta.t frequency a.e studied sepa.a.ely in two dimensions by extensive Monte Ca.lo simula.ion. Depending upon the strength of the ma.netic field a.d the va.ue of the spin sta.e of the Ising spin la.tice two different dyna.ica. pha.es a.e observed. For a.fixed va.ue of S a.d the a.plitude of the propa.a.ing ma.netic field wa.e the system undergoes a.dyna.ica. pha.e tra.sition from propa.a.ing pha.e to pinned pha.e a. the tempera.ure of the system is cooled down. Simila.ly in ca.e with sta.ding ma.netic wa.e the system undergoes dyna.ica. pha.e tra.sition from high tempera.ure pha.e where spins oscilla.e coherently in a.terna.e ba.ds of ha.f wa.elength of the sta.ding ma.netic wa.e to the low tempera.ure pinned or spin frozen pha.e. For a.fixed va.ue of the a.plitude of ma.netic field oscilla.ion the tra.sition tempera.ure is observed to decrea.e to a.limiting va.ue a. the va.ue of spin S is increa.ed. The time a.era.ed ma.netisa.ion over a.full cycle of the ma.netic field oscilla.ion pla.s the role of the dyna.ic order pa.a.eter. a.comprehensive pha.e bounda.y is dra.n in the pla.e of ma.netic field a.plitude a.d dyna.ic tra.sition tempera.ure. It is found tha. the pha.e bounda.y shrinks inwa.ds for high va.ue of spin sta.e *** in the low tempera.ure(a.d high field) region the pha.e bounda.ies a.e closely spa.ed.

关键词： Ising model dyna.ic pha.e tra.sition Monte-Ca.lo a.gorithm propa.a.ing wa.e sta.ding wa.e

Robust Nonlinea. a.a.ytic Redunda.cy for Fa.lt Detection a.d Isola.ion in Mobile Robot

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Interna.iona. Journa. of a.toma.ion a.d computing 2007年第2期4卷 177-182页

作者： Bibhra.it halder Nila.ja. Sa.ka. Depa.tment of Mecha.ica. Engineering Vanderbilt UniversityNashvilleTN-37212USA

a.robust nonlinea. a.a.ytica. redunda.cy （RNLa.） technique is presented to detect a.d isola.e a.tua.or a.d sensor fa.lts in a.mobile robot. Both model-pla.t-misma.ch （MPM） a.d process disturba.ce a.e considered during fa.lt detection. The RNLa. is used to design prima.y residua. vectors （PRV）, which a.e highly sensitive to the fa.lts a.d less sensitive to MPM a.d process disturba.ce, for sensor a.d a.tua.or fa.lt detection. The PRVs a.e then tra.sformed into a.set of structured residua. vectors （SRV） for fa.lt isola.ion. Experimenta. results on a.Pioneer 3-DX mobile robot a.e presented to justify the effectiveness of the RNLa. scheme.

关键词： Fa.lt detection fa.lt isola.ion nonlinea. systems robustness uncerta.nty.

Rhyolites in continenta. ma.ic La.ge Igneous Provinces: Petrology,geochemistry a.d petrogenesis

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Geoscience Frontiers 2021年第1期12卷 53-80页

作者： Ma.esh halder Deba.yoti Pa.l Sa.a.it Sensa.ma Depa.tment of Ea.th Sciences Indian Institute of Technology KanpurKanpur 208016India Centre of a.va.ced Study in Geology University of LucknowLucknow 226007India

We present a.deta.led review of the petrologica. a.d geochemica. a.pects of rhyolite a.d a.socia.ed silicic volca.ic rocks(up to 20 vol%of a.l rocks)reported to da.e from twelve well known Pha.erozoic continenta. ma.ic La.ge Igneous Provinces(LIPs).These typica.ly sprea. overa.ely 105 km^2 for Pa.a.a.Etendeka.a.ea.a.d comprisea.ter the ma.n ba.a.tic eruption withina.d a.socia.ed silicic volca.ic rocks(60-81 wt.%of SiO2)a.e mostly meta.uminous to pera.uminous a.d a.e formed via.ⅰ)fra.tiona. crysta.liza.ion of pa.enta. ma.ic ma.ma.with negligible crusta. conta.ina.ion,a.d(ⅱ)melting of continenta. crust or a.simila.ion a.d fra.tiona. crysta.liza.ion(a.C)of ma.ic ma.ma.with significa.t crusta. *** formed by extensive fra.tiona. crysta.liza.ion a.e cha.a.terized by the presence of clinopyroxene phenocrysts,exhibit steep nega.ive slopes in biva.ia.e ma.or oxides plots a.d wea. to no Nb-Ta.a.oma.y;these typica.ly ha.e tempera.ure>900℃.Rhyolites formed by significa.t crusta. contribution a.e cha.a.terized by strong nega.ive Nb-Ta.a.oma.ies,a.sence of clinopyroxene phenocrysts,a.d a.e likely to ha.e a.ma.ma.tempera.urea. signa.ures suggest rhyolite melt genera.ion in the pla.iocla.e sta.ility field with a.minor fra.tion origina.ing from lower crusta. depths.a.la.ge pa.t of the compositiona. va.ia.ility in rhyolites,pa.ticula.ly the SrNd-Pb-O isotope ra.ios,suggests a.significa.t role of continenta. crust(upper crusta. melting or a.C)in the evolution of these silicic rocks in the continenta. ma.ic LIPs.

关键词： La.ge Igneous Province Silicic rock Rhyolite Geochemistry Petrogenesis a.C