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91.
Rui-Jing Lu~ 《中国天文和天体物理学报》2006,(1)
We investigate the relationship between the rise width and the full width of gamma-ray burst pulses.Theoretical analysis shows that either width is proportional to Γ~(-2)Δ_(Тθ),FWHM(RRc)/c(Γ the Lorentz factor of the bulk motion,Δ_(Тθ),FWHM a local pulse's width,R_c the radius of fireballs and c the velocity of light).We study the relationship for four samples of observed pulses.We find:(1)merely the curvature effect could reproduce the relationship between the rise and full widths with the same slope as derived from the model of Qin et al.;(2)gamma-ray burst pulses,selected from both the short and long GRBs,follow the same sequence in the rise width vs. full width diagram,with the shorter pulses at one end;(3)all GRBs may intrinsically result from local Gaussian pulses.These features place constraints on the physical mechanism(s)for producing long and short GRBs. 相似文献
92.
1 IntroductionThroughoutthegeologicalhistory ,almostallthetectonicplateactivities,suchasearthquakes,volcaniceruption ,andmountainbuilding ,takeplaceatactiveplateboundaries.Forexample,approxi mately 90 percentoftheearthquakesoccuratactiveplateboundaries[1 - 4 ] ,andthehighestmountainsofTibetandAndesresultfromthecontinualcollisionbetweenIndiaandAsia ,NazcaandSouthAmericaplates,respectively .Aplateboundaryisafracturethatseparatesaplatefromanother;theneighboringplatesmoverelativetooneanotherin… 相似文献
93.
1 IntroductionTherefractionoflight electronicsignalpropa gatinginatmospherehasbeenstudiedbymanysci entistsandsomemodelofatmosphericrefractioncorreetionhaveheenestablished ,includingHopfieldSaastamoinen,DavisandMarinimodels[1 ] .Butthesemodelscanbeusedonlytocalculatethecorrec tionfortherefractionduetoatmosphericdensityvariation ,whilethecorrectionfortherefractionduetothesignalpathflexurecannotbecalculated .Hop fieldhasestimatedsignalpathflexureerrorbythemethodofraytracing[2 ] ,butastrictcorr… 相似文献
94.
1 IntroductionTomonitorthecurrentcrustalmotionandearthquakehazardsinNorthChinaarea,theFirstCrustalMonitoringandApplicationCenter (FC MAC)oftheChinaEarthquakeAdministration(CEA)hasestablishedaGlobalPositioningSystem(GPS)monitoringnetworkinNorthChinaandtheCapital(Beijing)Circlearea .TheobservedstationsaremainlydistributedinthenorthernpartofNorthChinaandCapitalCirclearea (Fig .1 ) .Theregionisbetween 1 0 7°Eand 1 2 2°E (about 1 40 0km) ,andbetween 33°Nand 42°N (about 80 0km) .… 相似文献
95.
Zhang Jingxiang 《中国地理科学(英文版)》1996,(4)
CHINA’S URBAN RESIDENTIAL COMMUNITY IN THE COURSE OF TRANSFER OF SOCIAL PATTERNCHINA’SURBANRESIDENTIALCOMMUNITYINTHECOURSEOFT... 相似文献
96.
CHEN Guo-jie 《中国地理科学(英文版)》2001,11(4):289-293
ISUSTAINABLE DEVELOPMENT IS UNDER UN-guiding human forward.he author pointed out manyCEASINGCHALLENGES times that sustainable developmentwas a correctstrategic selectlonforhumanfuture and It representedaThe Zlst Century has come,people have many newdevelopmentoutlook,strategic vie呷olntandvalueforecasts and long for a wonde山lprospect.The 21st(CHEN,1997;200a;200b).Century lsa bio-sclentmc era,an economic global-The authoralso pointed out th… 相似文献
97.
1INTRODUCTIONWiththeaccelerationoftheeconomicglobaliza-tionthegradualshapingofthenewinternationaldivi-sionoflaborandthedevelopmentofthetransnationalcorporationstheworldurbansystemshavebegunanewroundofintegration.Ononehandthecitiesallovertheglobeare… 相似文献
98.
1 INTRODUCTIONIn the previous paper (on et al. 1999, hereafter Paper I), we investigated the wavelength-dependence of four colltribution functions (CFs) derived from dmerent formal solutions andreferring to different emergellt quantities in the unpolarized case. Because one cannot generallyassign a single formation region to the whole line band in a real stellar atmosphere, e.g., the solaratmosphere, instead, the line formation region can be defined as the layers deviating farthestfrom t… 相似文献
99.
1 INTRODUCTIONSolar microwave bursts are usually produced by dtherellt radiation mechanisxns: gyroresonance absorption, Coulomb brernsstrahlung of the thermal baCkground plasma, as well asgyrosynchrotron radiation of the nonihermal electrons (Hildebrandt et al. 1998). Meanwhile,cyclotron or synchrotron maser instabilities may be responsible for microwave spaaes, blips, andtype ill bursts (Wu 1985; Huang 1987; Huang et al. 1996; Huang 1998), which are usuajly superposed on the ambient mi… 相似文献
100.
EFFECTS OF AGRICULTURE RECLAMATION ON THE HYDROLOGIC CHARACTERISTICS IN THE SANJIANG PLAIN, CHINA 总被引:1,自引:1,他引:0
1 THE NATURAL ENVIRONMENTAL CHARACTERISTICS The Sanjiang Plain is located in the northeast of Heilongjiang Province, China. Russia borders this region in the north and east. Its total area is 1.088×107ha. The area of plain occupies 61.21%of the total land area and that of hill and mountain amounts to 38.79%of the total land area. It is not only one of the most important regions with large area of fresh water wetlands and with varieties of rare migratory waterfowls, but a… 相似文献