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Field-dependent spin waves in high-aspect-r.tio singlecr.stal fer.omagnetic nanowir.s

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Nano r.sear.h 2016年第5期9卷 1426-1433页

作者： Semanti pal Susmita Saha M. Venkata Kamalakar.Anjan Bar.an Depar.ment of Condensed Matter.Physics and Mater.al Sciences S. N. Bose National Centre for Basic Sciences Block JD Sector Ⅲ Salt Lake Kolkata 700 098 India Depar.ment of Physics and Astr.nomy Uppsala University Box 516 75120 Uppsala Sweden

We investigate the spin wave （SW） modes in high-aspect-r.tio single-cr.stal fer.omagnetic nanowir.s （FMNWs） using an all-optical time-r.solved magnetooptical Ker. effect （Tr.MOKE） micr.scope. The pr.cessional magnetization dynamics in such FMNWs unveil the pr.sence of unifor. and quantized SW modes that can be tuned by var.ing the bias magnetic field （H）. The fr.quencies of the modes ar. obser.ed to decr.ase systematically with a decr.asing magnetic field, and the number.of modes in the spectr.m is r.duced fr.m four.to thr.e for.H 〈 0.7 kOe. To under.tand these r.sults, we per.or. micr.magnetic simulations that r.veal the pr.sence of edge, standing wave, and unifor. SW modes in the nanowir.s （NWs）. Our.simulations clear.y show how the standing wave and unifor. SW modes coalesce to for. a single mode with unifor. pr.cession over.the entir. NW for.H 〈 0.7 kOe, r.pr.ducing the exper.mentally obser.ed r.duction in modes. Our.study elucidates the possibility of manipulating the SW modes in magnetic nanostr.ctur.s, which is useful for.applications in magnonic and spintr.nic devices.

关键词： Spin Wave Bias Field Fer.omagnetic r.sonance Magnetization Dynamic Unifor. Mode

Thickness Dependent Physical Pr.per.ies of Ther.ally Evapor.ted Nanocr.stalline CdSe Thin Films

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Acta Metallur.ica Sinica(English Letter.) 2015年第10期28卷 1299-1304页

作者： Anur.dha Pur.hit Subhash Chander.Satya pal Nehr. Mahendr. Singh Dhaka Depar.ment of Physics Mohanlal Sukhadia University Centr. of Excellence for.Ener.y and Envir.nmental Studies Deenbandhu Chhotu Ram University of Science and Technology Micr.electr.nics r.sear.h Center Iowa State University of Science and Technology

This paper.pr.sents a study on thickness dependent physical pr.per.ies of cadmium selenide thin films. The films of thickness 445, 631 and 810 nm wer. deposited employing ther.al evapor.tion technique on glass and ITO-coated glass substr.tes followed by ther.al annealing in air.atmospher. at 200 °C. These films wer. subjected to X-r.y diffr.ctometer. UV-Vis spectr.photometer. scanning electr.n micr.scopy（SEM） and electr.meter.for.str.ctur.l, optical,sur.ace mor.hological and electr.cal analysis r.spectively. The str.ctur.l analysis r.veals that the films ar. nanocr.stalline in natur. with cubic phase and pr.fer.ed or.entation（111）. The cr.stallogr.phic par.meter. such as lattice constant, inter.lanar.spacing, gr.in size, inter.al str.in, dislocation density, number.of cr.stallites per.unit ar.a and textur. coefficient ar. calculated and discussed. The optical band gap is found in the r.nge 1.75-1.92 e V and obser.ed to incr.ase with *** SEM study shows that the annealed films ar. unifor., fully cover.d and well defined. The electr.cal analysis shows that the conductivity is var.ed with film thickness and found within the or.er.of semiconductor.behavior.

关键词： Thin films X-r.y diffr.ction Optical pr.per.ies Electr.cal pr.per.ies Evapor.tion

All-optical adder.subtr.ctor.based on ter.her.z optical asymmetr.c demultiplexer

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Chinese Optics Letter. 2009年第6期7卷 530-533页

作者： Dilip Kumar.Gayen r.jat Kumar.pal Jitendr. Nath r.y Depar.ment of Computer.Science College of Engineering and Management Depar.ment of Computer.Science and Engineer.ng Calcutta University Depar.ment of Physics College of Engineering and ManagementKolaghat KTPP Township

An all-optical adder.subtr.ctor.（A/S） unit with the （TOAD） is pr.posed. The all-optical A/S unit with help of ter.her.z optical asymmetr.c demultiplexer.a set of all-optical full-adder. and optical exclusive- Or. （XOr.）, can be used to per.or. a fast centr.l pr.cessor.unit using optical har.war. components. We tr. to exploit the advantages of TOAD-based optical switch to design an integr.ted all-optical cir.uit which can per.or. binar. addition and subtr.ction. With computer.simulation r.sults confir.ing the descr.bed methods, conclusions ar. given.

关键词： EDFA XOr All-optical adder.subtr.ctor.based on ter.her.z optical asymmetr.c demultiplexer mode

Or.anic far.ing in India: a vision towar.s a healthy nation

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Food Quality and Safety 2020年第2期4卷 69-76页

作者： Sur.atapa Das Annalakshmi Chatter.ee Tapan Kumar.pal Depar.ment of Food and Nutr.tion Maharani Kasiswari CollegeUniversity of CalcuttaKolkataIndia Depar.ment of Home Science University of CalcuttaKolkataIndia Depar.ment of Biotechnology Bengal Institute of TechnologyKolkataIndia

Food quality and safety ar. the two impor.ant factor. that have gained ever.incr.asing attention in gener.l *** gr.wn foods have immense adver.e health effects due to the pr.sence of higher.pesticide r.sidue,mor. nitr.te,heavy metals,hor.ones,antibiotic r.sidue,and also genetically modified ***,conventionally gr.wn foods ar. less nutr.tious and contain lesser.amounts of pr.tective *** the quest for.safer.food,the demand for.or.anically gr.wn foods has incr.ased dur.ng the last decades due to their.pr.bable health benefits and food safety *** food pr.duction is defined as cultivation without the application of chemical fer.ilizer. and synthetic pesticides or.genetically modified or.anisms,gr.wth hor.ones,and *** popular.ty of or.anically gr.wn foods is incr.asing day by day owing to their.nutr.tional and health *** far.ing also pr.tects the envir.nment and has a gr.ater.socio-economic impact on a *** is a countr. that is bestowed with indigenous skills and potentiality for.gr.wth in or.anic *** India was far.behind in the adoption of or.anic far.ing due to sever.l r.asons,pr.sently it has achieved r.pid gr.wth in or.anic agr.cultur. and now becomes one of the lar.est or.anic pr.ducer. in the ***,or.anic far.ing has a gr.at impact on the health of a nation like India by ensur.ng sustainable development.

关键词： food safety or.anic food biodiver.ity sustainable far.ing conventional far.ing

Adsor.tion of Cationic Laser.Dye onto Polymer.Sur.actant Complex Film

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Chinese Jour.al of Chemical Physics 2011年第3期24卷 348-352,I0004页

作者： Pabitr. Kuiilar.Paul Syed Ar.had Hussain Debajyoti Bhattachar.ee Mr.nal pal 印度贾达沃普尔大学物理系尔各答-700032 印度特里普拉邦大学物理系 Suryamaninagar-799130 印度中央机械工程研究所杜尔加布尔-713209

Fabr.cation of complex molecular.films of or.anic mater.als is one of the most impor.ant issues in moder. nanoscience and nanotechnology. Soft mater.als with flexible pr.per.ies have been given much attention and can be obtained thr.ugh bottom up pr.cessing fr.m functional molecules, wher. self-assembly based on supr.molecular.chemistr. and designed assembly have become cr.cial pr.cesses and technologies. In this wor., we r.por. the successful incor.or.tion of cationic laser.dye r.odamine 6G abbr.viated as r.G into the pr.-assembled polyelectr.lyte/sur.actant complex film onto quar.z substr.te by electr.static adsor.tion technique. Poly（allylamine hydr.chlor.de）（PAH） was used as polycation and sodium dodecyl sulphate （SDS） was used as anionic sur.actant. UV-Vis absor.tion spectr.scopic char.cter.zation r.veals the for.ation of only H-type aggr.gates of r.G in their.aqueous solution and both H- and J-type aggr.gates in PAH/SDS/r.G complex layer.bylayber.films as well as the adsor.tion kinetics of r.G onto the complex films. The r.tio of the absor.ance intensity of two aggr.gated bands in PAH/SDS/r.G complex fihns is mer.ly independent of the concentr.tion r.nge of the SDS solution used to fabr.cate PAH/SDS complex self-assembled films. Atomic for.e micr.scopy r.veals the for.ation of r.G aggr.gates in PAH/SDS/r.G complex films.

关键词： Layer.by-layer.self assembly Cationic dye Electr.static adsor.tion UV-Vis absor.tion spectr.scopy

Load fr.quency contr.l in der.gulated power.system with wind integr.ted system using fuzzy contr.ller

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Fr.ntier. in Ener.y 2013年第2期7卷 245-254页

作者： Yajvender.pal VEr.A Ashwani KUMAr Depar.ment of Electr.cal & Electr.nics Engineer.ng UIET PanjabUniversity Chandigarh 160014 India Depar.ment of Electr.cal Engineer.ng National Institute of TechnologyKurukshetra Haryana 132119 India

This paper.pr.sents the analysis of load fr.quency contr.l （LFC） of a der.gulated two-ar.a hydr.-ther.al power.system using fuzzy logic contr.ller. with doubly fed induction gener.tor. （DFIGs） integr.ted into both the contr.l ar.as. The der.gulation of power.sector.has led to the for.ation of new companies for.gener.tion, tr.nsmission and distr.bution of power. The conventional two-ar.a power.system is modified to study the effects of the bilater.l contr.cts of companies on the system dynamics. Der.gulation cr.ates highly competitive and distr.buted contr.l envir.nment, and the LFC becomes even mor. challenging when wind gener.tor. ar. also integr.ted into the system. The over.ll iner.ia of the system r.duces, as the wind unit does not pr.vide iner.ia and isolates fr.m the gr.d dur.ng distur.ances. The DFIGs integr.ted pr.vide iner.ial suppor. to the system thr.ugh modified iner.ial contr.l scheme, and ar.ests the initial fall in fr.quency after.distur.ance. The iner.ial contr.l r.sponds to fr.quency deviations, which takes out the kinetic ener.y of the wind tur.ine for.impr.ving the fr.quency r.sponse of the system. To enhance the par.icipation of the doubly fed induction gener.tor.（DFIG） in the fr.quency contr.l, optimal values of the speed contr.l par.meter. of the DFIG-based wind tur.ine have been obtained using integr.l squar. er.or.（ISE） technique. The dynamics of the system have been obtained for.a small load per.ur.ation, and for.contr.ct violation using fuzzy contr.ller.

关键词： fr.quency r.gulation fuzzy contr.ller der.gulated power.system doubly fed induction gener.tor.DFIG) bilater.l contr.ct

Effect of E × B electr.n dr.ft and plasma dischar.e in dc magnetr.n sputter.ng plasma

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Chinese Physics B 2011年第1期20卷 435-443页

作者： Sankar.Moni Bor.h Ar.p r.tan pal Her.mba Bailung Joyanti Chutia Plasma Physics Labor.tor. Material Sciences DivisionInstitute of Advanced Study in Science and TechnologyPaschim BoragaonGuwahati - 781035AssamIndia

Study of electr.n dr.ft velocity caused by E ×B motion is done with the help of a Mach pr.be in a dc cylindr.cal magnetr.n sputter.ng system at differ.nt plasma dischar.e par.meter. like dischar.e voltage, gas pr.ssur. and applied magnetic field str.ngth. The inter.lay of the electr.n dr.ft with the differ.nt dischar.e par.meter. has been investi- gated. Str.ng r.dial var.ation of the electr.n dr.ft velocity is obser.ed and is found to be maximum near.the cathode and it decr.ases slowly with the incr.ase of r.dial distance fr.m the cathode. The sheath electr.c field, E measur.d exper.mentally fr.m potential pr.file cur.e using an emissive pr.be is contr.buted to the obser.ed r.dial var.ation of the electr.n dr.ft velocity. The measur.d values of the dr.ft velocities ar. also compar.d with the values fr.m the con- ventionM theor. using the exper.mental values of electr.c and magnetic fields. This study of the dr.ft velocity var.ation is helpful in pr.viding a useful insight for.deter.ining the dischar.e conditions and par.meter. for.sputter.deposition of thin film.

关键词： electr.n dr.ft velocity Mach pr.be cylindr.cal magnetr.n sputter.ng

Per.or.ance Assessment of Par.ially Pr.-fused Synthetic Flux in Basic Oxygen Steel Making

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Jour.al of Ir.n and Steel r.sear.h Inter.ational 2015年第10期22卷 916-923页

作者： Jagannath pal Satadal GHOr.I Debajyoti BANDYOPADHYAY Sukomal GHOSH CSIr.National Metallur.ical Labor.tor.

Lump lime as the most common flux and ir.n or. as a coolant ar. used in basic oxygen steel making. However. high melting point, poor.dissolution pr.per.y, fines gener.tion tendency and hygr.scopic natur. of lump lime often cr.ate pr.blems in oper.tion. As the combination of both ir.n oxide （Fe2O3） and CaO shows eutectic at 1 230 ℃, a combined mass of ir.n oxide and lime melts at lower.temper.tur. and dissolves faster.in a molten bath. A par.ially pr.-fused synthetic flux （PSF） was pr.par.d thr.ugh an innovative way in combination of ir.n oxide fines viz. Linz Donawitz conver.er.sludge and blast fur.ace flue dust and lime fines by micr.-pelletization of the mix followed by coke br.eze fr.e sinter.ng. The developed PSF shows good cold handling str.ngth, low melting point （1 180 ℃）, good ther.al shock r.sistance, etc. As a low melting synthetic flux, its per.or.ance was assessed thr.ugh dissolution/melting study in hot metal bath and r.fining of hot metal in a simulated bottom blown conver.er.using （i） PSF, （ii） only lump lime and （iii） lump lime with ir.n or. when keeping other.conditions identical. Ver. fast dissolution （27 80 s for.1-3 g lumps）, enhanced r.moval of C and P （11-12 min）, contr.lled slag foaming, and r.duced oxygen consumption was obtained for.using PSF.

关键词： synthetic flux melting r.fining basic oxygen conver.er

SiO2-coated pur. anatase TiO2 catalysts for.enhanced photo-oxidation of naphthalene and anthr.cene

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Par.icuology 2017年第5期15卷 156-161页

作者： Inder.r.et Singh Gr.ver.r.op Chand Pr.japat Satnam Singh Bonamali pal Depar.ment of Chemistr. Public College Samana 147101 Punjab India School of Chemistr. and Biochemistr. Thapar University Putiala 147004 Punjab India

Our.cur.ent effor.s r.veal the pr.par.tion of SiO2@TiO2 nanocomposites having differ.nt thicknesses of silica shell and the r.lationship to photocatalytic activity （PCA） for.the photo-oxidation of naph-thalene and anthr.cene. The pr.sence of SiO2 coating over.TiO2 sur.ace was demonstr.ted by FT-Ir.analysis, with peaks cor.esponding to Si-O-Si （1081 cm 1） and Si-O-Ti （950 cm-1） bonds obser.ed. High-r.solution tr.nsmission electr.n micr.scopy analysis confir.ed the pr.sence of SiO2 in the as- pr.par.d nanocomposites and the amount of Si, Ti, and O was deter.ined by ener.y disper.ive X-r.y spectr.scopy analysis. Incr.asing the Si02 shell thickness incr.ases the sur.ace ar.a of the nanocompos- ites （69-235 m2/g）, which enhances naphthalene/anthr.cene adsor.tion. However. the obser.ed PCA tr.nd pr.sents an inver.e cor.elation to the adsor.tion studies, wher. the as-pr.par.d samples possess- ing the highest sur.ace ar.as exhibited the least PCA, while catalysts having lower.sur.ace ar.as （among silica coated samples） displayed the highest PCA in the degr.dation of naphthalene and anthr.cene to CO2. Despite complete degr.dation of naphthalene and anthr.cene, incomplete miner.lization occur.ed, ascr.bed to the for.ation of var.ous inter.ediates, identified by GC-MS analysis.

关键词： Silica coating Naphthalene Anthr.cene Photo-oxidation TiO2 nanopar.icles