变质量物体的运动微分方程的研究

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2020-07-08

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©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(2003)04-0016-031,2,3,1(1.,130026;2.,130026;3.,130022):,,,,,,:;;;:0414111:A:2003204215:(1969-),,,,,,,()1tm,v,(vnc),mu,t+tm,v+vmmF,,(m+m)(v+v)-mv-mu=Ft,mv,t,t0,mdvdt+vdmdt-udmdt=F,(1)mdvdt=F-(v-u)dmdt,(2)d(mv)dt=F+udmdt,(3)u()dm,(1)()(2)mdvdt,()(3),;,,()()udmdt,2(1)dm(dm,dm),(2)(2):)Fmdm(,dm,))F-(v-u)dmdt:dt,13420038JOURNALOFCHANGCHUNUNIVERSITYVol113No14Aug.2003©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(v+dv)-dmu,,dmdmdt(v-u),dmdt(v-u)=f(e)-fm,f(e)dm(mdmdm,F),fm,(2)F-(v-u)dmdt=F-f(e)-fm,F-f(e),-fmdm,F-(v-u)dmdt(mdmm)dmmf(e),-(v-u)dmdtdmvu,,dmm,(dm0)(dm0)(v-u)dm0,(v-u)0,,;(v-u)0,dm0,(v-u)0,,;(v-u)0,,(3),m,dm1,dm2,u1u2dm1dm2,tmv+dm1u1,t+dt[m+dm1+(-|dm2|)](v+dv)||dm2|u2,dm2,(m+dm1+dm2)(v+dv)-dm2u2,(m+dm1+dm2)(v+dv)-dm2u2-mv-dm1u1=Fdt,,mdvdt+(v-u1)dm1dt+(v-u2)dm2dt=F,mdvdt=F-(v-u1)dm1dt-(v-u2)dm2dt.,dm1dm2dmn,mdvdt=F-(v-u1)dm1dt-(v-u2)dm2dt--(v-un)dmndt.:200m/s,50kg/s400m/s,,(dvdt=0),,,dm1dt=50kg/s,,u1=0dm2dt=52kg/s,,|u2-v|=400m/s,mdvdt=F-(v-u1)dm1dt-(v-u2)dm2dt,dvdt=0,F-(v-u1)dm1dt-(v-u2)dm2dt=0,,,,F,F=(v-u1)dm1dt+(v-u2)dm2dt,vu1u2F,,F=vdm1dt+(v-u2)dm2dt=-10800(N).,,,10800N,4:17©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:[1].()[M].:,137.Aninvestigationofmovingequationofchange2qualitybodyGUOXin1,ZHANGShuang2,SONGLi2jun3,WANGZhi2jun1(1.PhysicalScienceCollege,JilinUniversity,Changchun130026,China;2.ElectronicScienceandEngineeringCollege,JilinUniversity,Changchun130026,China;3.DeanpsOffice,ChangchunUniversity,Changchun130022,China)Abstract:Inphysicsofuniversity,introducingNewtonpslawofmotion,themotionoftheunchange2qualitybodyismainlyinvolvedandtheoneofthechange2qualitybodyislessinformed.Thearticlestartsfromthemomentumtheoremtodeducethethreeexpressionsofthemomen2tumequationofthechange2qualitybodyandthenmakesadetaileddiscussiononeachofthem.Finally,theconcreteexamplesaregiventohaveanexhaustivestudy.Keywords:change2quality;merged2quality;disintegrate2quality;mainstay(8),GIS,GroupId(),,GIS,,:[1]GBT579129315000;110000[S].[2]GBT156002199515000;110000;125000;150000;1100000[S].[3]GBT1451229311000000[S].[4]GB8566288[S].AnapplicationofGIStomanagementsysteminthepolicestationCHUYe2feng,CHENGYu2mei(VocationalandTechnologicalCollege,ChangchunUniversity,Changchun130022,China)Abstract:ThearticlegivesabriefintroductionoftheGIStechniqueanddiscussesthemaintechnicalcontentandthebasicprincipleusedinthemanagementsysteminthepolicestation.Itexpoundsthebasicfunctionofthesystem,thetechniqueofdifficultyandkey,andtheinno2vativepoint.Italsogivesoutthefunctionalstructureofthesystemandtheflow2processdesign.Thecriterionadoptedbytheprojectisintro2ducedintheend.Keywords:geographicinformationsystem;spatialdatabasecontrol;information;computercomplexmanagementsystemofgeneralmanage2mentsystemofcomputer1813