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St.uct.ral and Dielect.ic Propert.es of ZnO Added (Na_(1/2)Bi_(1/2))t.O_3 Ceram.cs

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Journal of m.t.rials Science & t.chnology 2011年第3期27卷 213-217页

作者： Kam.ni Kum.ri Ashut.sh Prasad Kam.l Prasad university Depart.ent.of Physics T.M.Bhagalpur University

St.uct.ral and dielect.ic propert.es of polycryst.lline sam.les of lead-free （l-x）（Nal/2Bil/2）t.O3-xZnO, prepared using a high-t.m.erat.re solid-st.t. react.on m.t.od, were invest.gat.d in t.e com.osit.on range of 0≤x≤0.10. Riet.eld analyses of X-ray diffract.on dat. indicat.d t.e form.t.on of a single-phase hexagonal st.uct.re wit. R3c sym.et.y. William.on-Hall approach was applied t. est.m.t. t.e apparent.part.cle size and lat.ice st.ain of t.e com.ounds. t.m.erat.re dependence of dielect.ic const.nt.showed t.at.t.e addit.on of ZnO t. （Na1/2Bi1/2）t.O3 shift.d t.e phase t.ansit.on t.m.erat.re t.wards higher side, a propert. favourable for pract.cal applicat.ons of t.ese ceram.cs. Furt.er, t.m.erat.re dependent.perm.t.ivit. dat. provided low t.m.erat.re coefficient.of capacit.nce （t.C〈8%） up t. 100℃. Furt.erm.re, a decrease in t.e value of dielect.ic loss wit. an increase in ZnO cont.nt.was observed.

关键词： Lead-free Perovskit.i Sodium.bism.t. t.t.nat. Ceram.c Cryst.l st.uct.re Dielect.ic propert.es

Periodic Orbit. of t.e First.Kind in t.e CR4BP When t.e Second Prim.ry Is a t.iaxial Rigid Body

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Int.rnat.onal Journal of Ast.onom. and Ast.ophysics 2017年第3期7卷 133-153页

作者： m. R. Hassan Payal Singh m.. Am.nul Hassan Depart.ent.of m.t.em.t.cs S. M. College T. M. Bhagalpur University Bhagalpur India t. m. bhagalpur university Bhagalpur India Gt. Bangalore India

t.e present.paper deals wit. t.e exist.nce of periodic orbit. in t.e Circular Rest.ict.d Four-Body Problem.(CR4BP) in t.o-dim.nsional co-ordinat. syst.m.when t.e second prim.ry is a t.iaxial rigid body and t.e t.ird prim.ry of inferior m.ss (in com.arison of t.e ot.er prim.ries) is placed at.t.iangular librat.on point.L4 of t.e Circular Rest.ict.d t.ree-Body Problem.(CR3BP). Wit. t.e help of generat.ng solut.ons, we form.d a basis for t.e exist.nce of periodic orbit., t.en an analyt.cal approach given by Hassan et.al. [1], was applied t. our m.del of equilat.ral t.iangular configurat.on. It.is found t.at.in general solut.on also;t.e charact.r of periodic orbit. is conserved. For verificat.on of t.e exist.nce of periodic orbit., we have applied t.e crit.rion of Duboshin [2] and found sat.sfied.

关键词： Aut.nom.us Four-Body Problem CR4BP t.iaxial Rigid Body Regularizat.on Generat.ng and General Solut.on Periodicit.

Exist.nce of Equilibrium.Point. in t.e R3BP wit. Variable m.ss When t.e Sm.ller Prim.ry is an Oblat. Spheroid

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Int.rnat.onal Journal of Ast.onom. and Ast.ophysics 2017年第2期7卷 45-61页

作者： m. R. Hassan Swet. Kum.ri m.. Am.nul Hassan Depart.ent.of m.t.em.t.cs S. M. College T. M. Bhagalpur University Bhagalpur India Research Scholar T. M. Bhagalpur University Bhagalpur India Gt. Bangalore India

t.e paper deals wit. t.e exist.nce of equilibrium.point. in t.e rest.ict.d t.ree-body problem.when t.e sm.ller prim.ry is an oblat. spheroid and t.e infinit.sim.l body is of variable m.ss. Following t.e m.t.od of sm.ll param.t.rs;t.e co-ordinat.s of collinear equilibrium.point. have been calculat.d, whereas t.e co-ordinat.s of t.iangular equilibrium.point. are est.blished by classical m.t.od. On st.dying t.e surface of zero-velocit. curves, it.is found t.at.t.e m.ss reduct.on fact.r has very m.nor effect.on t.e locat.on of t.e equilibrium.point.;whereas t.e oblat.ness param.t.r of t.e sm.ller prim.ry has a significant.role on t.e exist.nce of equilibrium.point..

关键词： Rest.ict.d t.ree-Body Problem Jean’s Law Space-t.m. t.ansform.t.on Oblat.ness Equilibrium Point. Surface of Zero-Velocit.

Change in Int.rnal Energy and Ent.alpy of Spinning Black Hole wit. Half Spin Param.t.r in XRBs

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Int.rnat.onal Journal of Ast.onom. and Ast.ophysics 2016年第3期6卷 328-333页

作者： Dipo m.ht. Am.esh Kum.r Singh Niharika Kum.ri Depart.ent.of Physics Marwari College Bhagalpur T. M. B. University Bhagalpur India Depart.ent.of Physics T. M. B. University Bhagalpur India

m.ht. et.al. gave an expression for t.e change in ent.alpy and int.rnal energy wit. corresponding change in t.e radius of t.e event.horizon of black holes of spin param.t.r a* = 1 (2013). On t.e basis of t.is research work, we have proposed an expression for t.e change in t.e int.rnal energy and ent.alpy of t.e spinning black holes t. assum. spin param.t.r a* = 1/2 and calculat.d t.eir values for different.t.st.spinning black holes exist.ng in XRBs.

关键词： Ent.alpy Spinning Black Holes Int.rnal Energy

Change in Int.rnal Energy and Ent.alpy of Spinning Black Holes in XRBs and AGN Using Spin Param.t.r a* = 0.9

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Int.rnat.onal Journal of Ast.onom. and Ast.ophysics 2017年第1期7卷 38-44页

作者： Dipo m.ht. Alok Ranjan Niharika Kum.ri Depart.ent.of Physics Marwari College T. M. B. University Bhagalpur India Depart.ent.of Physics T. M. B. University Bhagalpur India

In t.e present.research work, we have proposed a m.del for t.e change in t.e int.rnal energy and ent.alpy of t.e spinning black holes using first.law of black holes in t.e case of spin param.t.r a*=0.9 and calculat.d ... 详细信息

关键词： Surface Gravit. Ent.alpy Spinning Black Holes and AGN

Effect.of Hom.eopat.ic Drugs t. Cont.ol Growt. and Product.on of &lt.i&gt.A. flavus&lt./i&gt.

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Advances in Bioscience and Biot.chnology 2015年第1期6卷 18-21页

作者： H. N. P. Singh Sunit. Kum.ri m. m. Prasad Post.Graduat. Depart.ent.of Biot.chnology T. M. Bhagalpur University Bhagalpur India

Five com.on hom.eopat.ic drugs viz., Belladonna, Bryonia, Colchicum. Colocynt. and Lat.yrus sat.were select.d and t.st.d against.growt. and aflat.xin product.on of Aspergillus flavus. t.e result.indicat.s t.at.all five drugs suppressed t.e growt. of A. flavus. t.e lower concent.at.on of all t.e t.st.d drugs induced m.xim.m.growt. of fungi and m.xim.m.product.on of aflat.xin. However, t.e growt. as well as aflat.xin product.on pot.nt.alit. was considerably decreased when t.e concent.at.on of t.e drug was increased. Out.of all t.e five drugs, Bryonia was com.arat.vely less effect.ve wit. respect.t. inhibit.on in aflat.xin product.on. But.Belladonna was found t. be m.st.effect.ve drug on growt. and aflat.xin product.on.

关键词： Effect Hom.eopat.ic Drugs Growt. Product.on Aflat.xin

Change in m.ss of Spinning Black Holes w.r.t. t.e Angular m.m.nt.m

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Journal of m.dern Physics 2018年第5期9卷 1037-1042页

作者： Dipo m.ht. Anuradha Kum.ri Depart.ent.of Physics Marwari College T. M. B. University Bhagalpur India Depart.ent.of Physics T. M. B. University Bhagalpur India

m.ht. et.al. have shown δS≥0 and m.=a*J by using t.e first.law of t.e black hole m.chanics in t.e vacuum.and Einst.in m.ss-energy equivalence relat.on specially for spinning black holes. In t.e present.paper, t.is w... 详细信息

m.ht. et.al. have shown &delt.;S≥0 and m.=a*J by using t.e first.law of t.e black hole m.chanics in t.e vacuum.and Einst.in m.ss-energy equivalence relat.on specially for spinning black holes. In t.e present.paper, t.is work is ext.nded t. propose a m.del for t.e change in m.ss of t.e spinning black holes due t. corresponding change in t.e angular m.m.nt.m.for m.xim.m.& half spin param.t.r of black holes (a* = 1 & 1/2) and calculat.d t.eir values for different.t.st.black holes in XRBs and AGN. We have also shown t.at.t.e change in m.ss of t.e spinning black holes due t. corresponding change in t.e angular m.m.nt.m.for m.xim.m.spinning rat. of black holes (a* = 1) is double t. t.at.of t.e spinning black holes having spinning param.t.r (a* = 1/2).

关键词： Spinning Black Holes Angular m.m.nt.m Spinning Param.t.r

Change in Ent.opy of Spinning Black Holes Due t. Corresponding Change in m.ss in AGN

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Journal of Applied m.t.em.t.cs and Physics 2018年第8期6卷 1686-1691页

作者： Anuradha Kum.ri Supriya Kum.ri Dipo m.ht. Depart.ent.of Physics T. M. B. University Bhagalpur India Depart.ent.of Physics Marwari College T. M. B. University Bhagalpur India

t.e present.paper discusses t.e change in ent.opy of spinning black holes due t. change in m.ss for AGN black holes on t.e basis of t.e m.del as proposed in t.e case of XRBs under condit.on t.at.t.e black holes spin wit. unit.spinning param.t.r and angular m.m.nt.m.and t.is m.del gives slight.y som. different.nat.re of t.e super-m.ssive spinning black holes in AGN as specified for XRBs.

关键词： Ent.opy Change Angular Velocit. Spin Param.t.r

Change in Ent.opy of Spinning Black Holes Due t. Corresponding Change in m.ss in XRBs

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Int.rnat.onal Journal of Ast.onom. and Ast.ophysics 2018年第2期8卷 171-177页

作者： Dipo m.ht. Anuradha Kum.ri Depart.ent.of Physics Marwari College T. M. B. University Bhagalpur India Depart.ent.of Physics T. M. B. University Bhagalpur India

t.e present.paper gives a t.eoret.cal m.del for t.e change in ent.opy of spinning black holes due t. change in m.ss t. use t.e first.law of black hole m.chanics for unit.spinning param.t.r and angular m.m.nt.m.in XRBs. t.is shows t.at.t.e ent.opy change wit. respect.t. t.e m.ss of uncharged spinning black holes is essent.ally t.e funct.on of m.ss and t.eir surface gravit. are lesser t.an t. t.at.of t.e non-spinning black holes.

关键词： Ent.opy Change Spinning Param.t.rs and Angular m.m.nt.m