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impa.t of the penetra.ion of distributed genera.ion on optima. rea.tive power dispa.ch

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Protection a.d Control of Modern Power Systems 2020年第1期5卷 352-377页

作者： Ta.ma. das Ra.jit Roy kamal k.ishna.Ma.da. Depa.tment of Power Engineering Jadavpur UniversityKolkataIndia Depa.tment of Electrica. Engineering Chaibasa Engineering CollegeChaibasaJharkhandIndia

Optima. rea.tive power dispa.ch(ORPD)is a.complex a.d non-linea. problem,a.d is one of the sub-problems of optima. power flow(OPF)in a.power *** is formula.ed a. a.single-objective problem to minimize the a.tive power loss in a.tra.smission *** this work.power from distributed genera.ion(DG)is integra.ed into a.conventiona. power system a.d the ORPD problem is solved to minimize tra.smission line power *** proves tha. the a.plica.ion of DG not only contributes to power loss minimiza.ion a.d improvement of system sta.ility but a.so reduces energy consumption from the conventiona. sources.a.recently proposed meta.heuristic a.gorithm k.own a. the Ja.a.a.gorithm is a.plied to the sta.da.d iEEE 14,30,57 a.d 118 bus systems to solve the newly developed ORPD problem with the incorpora.ion of *** simula.ion results prove the superiority of the Ja.a.a.gorithm over *** respective optima. va.ues of DG power tha. should be injected into the four iEEE test systems to obta.n the minimum tra.smission line power losses a.e a.so provided.

关键词： a.tive power loss Distributed genera.ion DG penetra.ion Ja.a.a.gorithm Optimiza.ion problem ORPD Pa.ticle swa.m optimiza.ion Va.ia.ts of PSO Tra.smission line losses

Fa.rica.ion of cost effective iron ore slime cera.ic membra.e for the recovery of orga.ic solvent used in cok. production

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interna.iona. Journa. of Coa. Science & Technology 2016年第2期3卷 226-234页

作者： V. Singh N. k. Meena.a. k. Golder C. das Depa.tment of Chemica. Engineering Indian Institute ofTechnology Guwahati Guwahati Assam 781039 India

improvement of cok.ng properties of sub-bituminous coa. （a. a.d bituminous coa. （B） wa. done using blended orga.ic solvents, na.ely, n-methyl-2-pyrrolidinone （NMP） a.d ethylenedia.ine （EDa.. Va.ious solvent blends were employed for the coa. extra.tion under the tota. reflux condition. a.low-cost cera.ic membra.e wa. fa.rica.ed using industria. wa.te iron ore slime of M/s Ta.a.steel R＆D, Ja.shedpur （india. to sepa.a.e out the dissolved cok.ng fra.tion from the solvent-coa. mixture. Membra.e sepa.a.ions were ca.ried out in a.ba.ch cell, a.d a.ound 75 % recovered NMP wa. reused. The fra.tiona.ed coa. properties were determined using proxima.e a.d ultima.e a.a.yses. in the ca.e of bituminous coa., the a.h a.d sulfur contents were decrea.ed by 99.3 % a.d 79.2 %, respectively, wherea., the ca.bon content wa. increa.ed by 23.9 % in the sepa.a.ed coa. fra.tion. Three different clea.ing a.ents, na.ely deionized wa.er, sodium dodecyl sulpha.e a.d NMP were used to rega.n the origina. membra.e permea.ility for the reusing.

关键词： iron ore slime Solvent recovery Proxima.e a.a.ysis Ultima.e a.a.ysis Membra.e clea.ing

Effects of irregula.ity a.d initia. stresses on the dyna.ic response of viscoela.tic ha.f-spa.e due to a.moving loa.

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a.ta.Mecha.ica.Solida.Sinica 2017年第3期30卷 306-317页

作者： a.k. Singh a. das a. La.shma. a. Negi a. Cha.topa.hya. Depa.tment of a.plied Ma.hema.ics Indian Institute of Technology (Indian School of Mines) Dhanbad 826004 Jharkhand India

The present a.ticle dea.s with the stresses developed in a. initia.ly stressed irregula. viscoela.tic ha.f-spa.e clue to a.loa. moving with a.consta.t velocity a. a.rough free surfa.e. Expressions for norma. a.d shea. stresses a.e obta.ned in closed form. The substa.tia. effects of influence pa.a.eters, viz., depth （from the free surfa.e）, irregula.ity fa.tor, ma.imum depth of irregula.ity, viscoela.tic pa.a.eter, horizonta. a.d vertica. initia. stresses, a.d frictiona. coefficient, on norma. a.d shea. stresses a.e investiga.ed. Moreover, compa.a.ive study is ca.ried out for three different ca.es of irregula.ity, viz., recta.gula. irregula.ity, pa.a.olic irregula.iW a.d no irregula.ity, which is ma.ifested through gra.hs.

关键词： Viscoela.tic irregula.ity Moving loa. Frictiona. coefficient Stresses

Simulta.eous pole-pla.ement/sta.iliza.ion of pa.rs of linea. time-inva.ia.t pla.ts using a.continuous-time periodic controller

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控制理论与应用（英文版） 2011年第4期9卷 493-499页

作者： Ja.a.i DEY Sa.it k. das Depa.tment of Electrica. Engineering Na.iona. institute of Technology Depa.tment of Electrica. Engineering india. institute of Technology

Given a.pa.r of single input single output （SiSO）, linea. time-inva.ia.t （LTi）, a.d strictly proper pla.ts of rela.ive order r, this pa.er employs a.continuous-time periodic controller to a.hieve 1） simulta.eous pole-pla.ement for r = 1 a.d 2） gua.a.teed simulta.eous sta.iliza.ion for r = 2, 3, a.d 4, which jobs LTi controllers ca.not, in genera., do. The controller a.so ensures insignifica.t output ripples. The a.a.ysis is ba.ed on a.era.ing principle. The computa.iona. steps for controller synthesis a.e linea. a.gebra.c in na.ure. a. exa.ple illustra.es the design procedure.

关键词： Periodic controller Simulta.eous pole-pla.ement/sta.iliza.ion

Effect of pouring tempera.ure on cooling slope ca.ting of semi-solid a.-Si-Mg a.loy

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a.ta.Meta.lurgica.Sinica.English Letters) 2012年第5期25卷 329-339页

作者： Prosenjit das Sudip k. Sa.a.ta.Hima.ri Cha.topa.hya. Pra.ip Dutta Foundry Group CSIR-Central Mechanical Engineering Research Institute Durgapur-713209 India Depa.tment of Mecha.ica. Engineering Jadavpur University Kolkata-70032 India Depa.tment of Mecha.ica. Engineering Indian Institute of Science Bangalore-560012 India

Present trend of semi-solid processing is directed towa.ds rheoca.ting route which a.lows ma.ufa.turing of nea.-net-sha.e ca.t components directly from the prepa.ed semi-solid slurry. Genera.ion of globula. equi-a.ed gra.ns during solidifica.ion of rheoca.t components, compa.ed to the columna. dendritic structure of conventiona. ca.ting routes, fa.ilita.es the ma.ufa.turing of components with improved mecha.ica. properties a.d structura. integrity. in the present investiga.ion, a.cooling slope ha. been designed a.d indigenously fa.rica.ed to produce semi solid slurry of a.-Si-Mg （a.56） a.loy a.d successively ca.t in a.meta.lic mould. The scope of the present work.discusses a.out development of a.numerica. model to simula.e the liquid meta. flow through cooling slope using Euleria. two-pha.e flow a.proa.h a.d to investiga.e the effect of pouring tempera.ure on cooling slope semi-solid slurry genera.ion process. The two pha.es considered in the present model a.e liquid meta. a.d a.r. Solid fra.tion evolution of the solidifying melt is tra.k.d a. different loca.ions of the cooling slope, following Schiel＇s equa.ion. The continuity equa.ion, momentum equa.ion a.d energy equa.ion a.e solved considering thin wa.l bounda.y condition a.proa.h. During solidifica.ion of the liquid meta., a.modified tempera.ure recovery scheme ha. been employed ta.ing ca.e of the la.ent hea. relea.e a.d cha.ge of fra.tion of liquid. The results obta.ned from simula.ions a.e compa.ed with experimenta. findings a.d good a.reement ha. been found.

关键词： Rheoca.ting Semi-solid slurry Cooling slope a.56 a.loy Numerica. simula.ion

a.survey on sensor loca.iza.ion

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控制理论与应用（英文版） 2010年第1期8卷 2-11页

作者： Jing Wa.G R. k. GHOSH Sa.a. k. das Center for Resea.ch in Wireless Mobility a.d Network.ng (CReWMa.) Department of Computer Science and Engineering University of Texas at Arlington Arlington TX 76019 USA Depa.tment of Computer Science a.d Engineering Indian Institute of Technology Kanpur India 208016

Loca.iza.ion is one of the funda.enta. problems in wireless sensor network. （WSNs）, since loca.ions of the sensor nodes a.e critica. to both network.opera.ions a.d most a.plica.ion level ta.k.. a.though the GPS ba.ed loca.iza.ion schemes ca. be used to determine node loca.ions within a.few meters, the cost of GPS devices a.d non-a.a.la.ility of GPS signa.s in confined environments prevent their use in la.ge sca.e sensor network.. There exists a. extensive body of resea.ch tha. a.ms a. obta.ning loca.ions a. well a. spa.ia. rela.ions of nodes in WSNs without requiring specia.ized ha.dwa.e a.d/or employing only a.limited number of a.chors tha. a.e a.a.e of their own loca.ions. in this pa.er, we present a.comprehensive survey on sensor loca.iza.ion in WSNs covering motiva.ions, problem formula.ions, solution a.proa.hes a.d performa.ce summa.y. Future resea.ch issues will a.so be discussed.

关键词： Sensor loca.iza.ion Wireless sensor network. Ra.ge mea.urements a.chors Mobile sensor Proba.bilistic loca.iza.ion

Einstein Energy-Momentum Complex for a.Pha.tom Bla.k.Hole Metric

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Chinese Physics Letters 2015年第2期32卷 19-22页

作者： P. k. Sa.oo k. L. Ma.a.ta.D. Goit a. k. Sinha.S. S. Xulu U. R. das a. Pra.a. R. Pra.a. Depa.tment of Ma.hema.ics Birla Institute of Technology and Science-Pilani Hyderabad Campus Hyderabad 500078 India Depa.tment of Ma.hema.ics C. V. Raman College of Engineering Bhubaneswar 752054 India Depa.tment of Physics B.S. College Patna 800012 India Depa.tment of Physics College of Commerce Patna 800020 India Depa.tment of Computer Science University of Zululand Kwa-Dlangezwa 3886 South Africa Depa.tment of Physics D.N. College Patna 804452 India Depa.tment of Physics L.S. College Muzaffarpur 842001 India

We ca.cula.e the energy distribution a.socia.ed with a.sta.ic spherica.ly symmetric non-singula. pha.tom bla.k.hole metric in Einstein＇s prescription in genera. rela.ivity. a. required for the Einstein energy-momentum complex, we perform the ca.cula.ions in qua.i-Ca.tesia. coordina.es. We a.so ca.cula.e the momentum components a.d obta.n a.zero va.ue, a. expected from the geometry of the metric.

关键词： Einstein Energy-Momentum Complex for a.Pha.tom Bla.k.Hole Metric FRW

impa.t of reducing a.d ca.ping a.ents on ca.bohydra.es for the growth of a. a.d Cu na.ostructures a.d their a.tiba.teria. a.tivities

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Pa.ticuology 2019年第2期17卷 219-226页

作者： Ra.ees a.ma. Ra.her Ra.a.deep k. Sa.wa.a.Nira.ja. das Bona.a.i Pa. School of Chemistry a.d Biochemistry Thapar Institute of Engineering and Technology Patiala 147004 Punjab India Depa.tment of Biotechnology Thapar Institute of Engineering and Technology Patiala 147004 Punjab India

This study presents a.via.le green synthesis a.proa.h to produce a. a.d Cu na.opa.ticles (MNPs) by using ca.bohydra.es such a. glucose, fructose, sucrose, a.d sta.ch a. reducing a.ents a.d describes theira.timicrobia. a.tivities a.a.nst Escherichia.coli DH5a. Optica. a.d diffused light sca.tering a.a.yses showed the a. NPs ra.ged from 20 to 75 nm a.d the Cu NPs va.ied from 20 to 160 nm, which supports the differences in their a.sorption ba.ds (400-434 nm for a. a.d 458-641 nm for Cu). The reducing suga.s intera.ted differently with a.^+ a.d Cu^2+ ba.ed on their size a.d hydrolysis by Na.H resulting in effective sta.iliza.ion of a.^0 a.d Cu^0 a.d va.ia.ion in the ba.tericida. a.tivities of the MNPs. The a.tiba.teria. effects of the MNPs were eva.ua.ed by mea.uring the inhibition zones using E. coli DH5a.a. a.test orga.ism. No growth wa. observed by restrea.ing different pa.ts of the clea.ly inhibited zones into new culture pla.es indica.ing the ba.tericida. effica.y of the a. a.d Cu MNPs. The a. NPs were found to be more effective in terms of the size of their in hibition zones (1.21-1.82 cm) compa.ed with those of the Cu NPs (0.0-1.2 cm). This study provides a.promising ba.is for the formula.ion of a.new gen era.ion of ba.tericida. a.ents.

关键词： Green synthesis a. a.d Cu na.opa.ticles Ca.bohydra.e reducing a.ents a.tiba.teria. a.tivities

a.ctic sea.ice extent: No record minimum in 2023 or recent yea.s

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a.mospheric a.d Ocea.ic Science Letters 2025年第1期18卷 52-55页

作者： Ola.M.Joha.nessen Tor i.Ola.ssen Na.sen Scientific Society BergenNorway Na.sen Environmenta. a.d Remote Sensing Center BergenNorway

a.ctic sea.ice extent rea.hes its minimum ea.h yea. in September. On 11 September 2023 the minimum wa. 4.969 million squa.e k.lometers(***^(2)). This wa. not a.record low, which occurred in 2012, when the minimum wa. 4.175 ***^(2), 0.794 ***^(2) less tha. the minimum in 2023. However, the ice extent ha. decrea.ed by 0.432 ***^(2) compa.ed with 2022. Nevertheless, the summer melting in 2023 wa. rema.k.0}ly less tha. expected when considering the strong hea. wa.es in the a.mosphere a.d ocea., with record tempera.ures set a.ound the world. in genera., there is a.high correla.ion between the long-term decrea.e in sea.ice extent a.d the increa.ing CO_(2) in the a.mosphere, where the increa.e of CO_(2) in recent deca.es expla.ns a.out 80% of the decrea.e in sea.ice in September, while the rema.nder is ca.sed by na.ura. va.ia.ility.

关键词： Sea.ice a.ctic Minimum ice Clima.e