After launching a jet,outflows of magnetar were used to account for the achromatic plateau of afterglow and the early X-ray flux plateau known as“internal plateau”.The lack of detecting magnetic dipole emission toge...After launching a jet,outflows of magnetar were used to account for the achromatic plateau of afterglow and the early X-ray flux plateau known as“internal plateau”.The lack of detecting magnetic dipole emission together with the energy injection feature in a single observation poses confusion until the long gamma-ray burst(GRB)210610B is detected.GRB 210610B is presented with an optical bump following an early X-ray plateau during the afterglow phase.The plateau followed by a steep decline flux overlays in the steadily decaying X-ray flux with indexα_(X,1)~2.06,indicating an internal origin and that can be fitted by the spin-down luminosity law with the initial plateau luminosity log_(10)L_(X)~48.29 erg s~(-1)and the characteristic spin-down timescale T~2818 s.A subsequent bump begins at~4000 s in the R band with a rising indexα_(R,1)~-0.30 and peaks at~14125 s,after which a decay indexα_(R,2)~0.87 and finally transiting to a steep decay withα_(R,3)~1.77 achieve the closure relation of the external shock for the normal decay phase as well as the magnetar spin-down energy injection phase,provided that the average value of the photon indexΓ_γ=1.80 derived from the spectral energy distributions(SEDs)between the X-ray and optical afterglow.The closure relation also works for the late X-ray flux.Akin to the traditional picture of GRB,the outflow powers the early X-ray plateau by dissipating energy internally and collides with the leading decelerating blast burst as time goes on,which could interpret the exotic feature of GRB 210610B.We carry out a Markov Chain Monte Carlo simulation and obtain a set of best parameters:■.The artificial light curve can fit the afterglow data well.After that,we estimated the average Lorentz factor and the X-ray radiation efficiency of the later ejecta are 35%and 0.13%,respectively.展开更多
目的回顾分析结直肠息肉术后再发的相关因素,为早期预防提供策略。方法对128例结直肠息肉术后患者,进行随访,并将随访资料及影响腺瘤再发相关因素进行Logistic回归分析,寻找息肉再发的高危因素。结果本组128例,5年内再发68例,再发率53....目的回顾分析结直肠息肉术后再发的相关因素,为早期预防提供策略。方法对128例结直肠息肉术后患者,进行随访,并将随访资料及影响腺瘤再发相关因素进行Logistic回归分析,寻找息肉再发的高危因素。结果本组128例,5年内再发68例,再发率53.13%。其中数目≥3个者46例,<3个者22例;息肉直径≥0.5 cm 45例,<0.5 cm 23例;单因素性别、年龄、生活习惯、息肉大小、数目等均为再发的重要因素。结论经多因素分析,男性、高龄、酗酒、吸烟、食用过多红肉、及息肉数目、大小等是结直肠息肉术后再发的高危因素;而素食、应用降糖药、非甾体类固醇激素等可降低其再发率。展开更多
基金funded by the National Natural Science Foundation of China(Nos.12373042,U1938201,12273005 and 12133003)the Programme of Bagui Scholars Programme(WXG)support of the China Space Station Telescope(CSST)。
文摘After launching a jet,outflows of magnetar were used to account for the achromatic plateau of afterglow and the early X-ray flux plateau known as“internal plateau”.The lack of detecting magnetic dipole emission together with the energy injection feature in a single observation poses confusion until the long gamma-ray burst(GRB)210610B is detected.GRB 210610B is presented with an optical bump following an early X-ray plateau during the afterglow phase.The plateau followed by a steep decline flux overlays in the steadily decaying X-ray flux with indexα_(X,1)~2.06,indicating an internal origin and that can be fitted by the spin-down luminosity law with the initial plateau luminosity log_(10)L_(X)~48.29 erg s~(-1)and the characteristic spin-down timescale T~2818 s.A subsequent bump begins at~4000 s in the R band with a rising indexα_(R,1)~-0.30 and peaks at~14125 s,after which a decay indexα_(R,2)~0.87 and finally transiting to a steep decay withα_(R,3)~1.77 achieve the closure relation of the external shock for the normal decay phase as well as the magnetar spin-down energy injection phase,provided that the average value of the photon indexΓ_γ=1.80 derived from the spectral energy distributions(SEDs)between the X-ray and optical afterglow.The closure relation also works for the late X-ray flux.Akin to the traditional picture of GRB,the outflow powers the early X-ray plateau by dissipating energy internally and collides with the leading decelerating blast burst as time goes on,which could interpret the exotic feature of GRB 210610B.We carry out a Markov Chain Monte Carlo simulation and obtain a set of best parameters:■.The artificial light curve can fit the afterglow data well.After that,we estimated the average Lorentz factor and the X-ray radiation efficiency of the later ejecta are 35%and 0.13%,respectively.
文摘目的回顾分析结直肠息肉术后再发的相关因素,为早期预防提供策略。方法对128例结直肠息肉术后患者,进行随访,并将随访资料及影响腺瘤再发相关因素进行Logistic回归分析,寻找息肉再发的高危因素。结果本组128例,5年内再发68例,再发率53.13%。其中数目≥3个者46例,<3个者22例;息肉直径≥0.5 cm 45例,<0.5 cm 23例;单因素性别、年龄、生活习惯、息肉大小、数目等均为再发的重要因素。结论经多因素分析,男性、高龄、酗酒、吸烟、食用过多红肉、及息肉数目、大小等是结直肠息肉术后再发的高危因素;而素食、应用降糖药、非甾体类固醇激素等可降低其再发率。
