In this paper,we presented the 23.3 yr of pulsar timing results of PSR J1456-6413 based on the observations of Parkes 64 m radio telescope.We detected two new glitches at MJD 57093(3)and 59060(12)and confirmed its fir...In this paper,we presented the 23.3 yr of pulsar timing results of PSR J1456-6413 based on the observations of Parkes 64 m radio telescope.We detected two new glitches at MJD 57093(3)and 59060(12)and confirmed its first glitch at MJD 54554(10).The relative sizes(Δν/ν)of these two new glitches are 0.9×10^(-9)and 1.16×10^(-9),respectively.Using the“Cholesky”timing analysis method,we have determined its position,proper motion,and two-dimensional transverse velocities from the data segments before and after the second glitch,respectively.Furthermore,we detected exponential recovery behavior after the first glitch,with a recovery timescale of approximately 200 days and a corresponding exponential recovery factor Q of approximately 0.15(2),while no exponential recovery was detected for the other two glitches.More interestingly,we found that the leading component of the integral pulse profile after the second glitch became stronger,while the main component became weaker.Our results will expand the sample of pulsars with magnetosphere fluctuation triggered by the glitch event.展开更多
BACKGROUND With the increasing trend of vaginal birth after caesarean delivery(VBAC),evaluation of the feasibility and safety of a second VBAC with grand multiparity is worth considering.Intrapartum uterine rupture is...BACKGROUND With the increasing trend of vaginal birth after caesarean delivery(VBAC),evaluation of the feasibility and safety of a second VBAC with grand multiparity is worth considering.Intrapartum uterine rupture is diagnosed in approximately one-fifth of all VBAC cases following successful vaginal delivery.To our knowledge,no report is available on the application of laparoscopy to repair postpartum uterine rupture after a successful second VBAC in China.CASE SUMMARY A 31-year-old woman(gravida 5,para 2)at 39 wk and 5 d of gestation was admitted to the hospital in labour.After a successful VBAC and observation for approximately 13 h,the patient complained of progressive abdominal pain.Given the symptoms,signs,and auxiliary examination results,intraperitoneal bleeding was considered.Because the patient was stable and ultrasound imaging was the only method available to assess the possibility of rupture,we recommended laparoscopy to clarify the diagnosis and for prompt laparoscopic uterine repair or exploratory laparotomy if necessary.Operative findings included transverse uterine scar rupture at the lower uterine segment of approximately 5.0 cm in length and 800 mL of intraoperative pelvic haemoperitoneum.Finally,she successfully underwent laparoscopic repair of uterine rupture and recovered very well according to three-dimensional magnetic resonance imaging at 42 d postpartum.CONCLUSION Routine postpartum intrauterine exploration is not beneficial to the mother and may even increase the risk of rupture.This case highlights a laparoscopic approach for repairing uterine rupture in the immediate postpartum period.展开更多
基金supported by the National SKA Program of China(Nos.2022SKA0130100,2020SKA0120100 and 2022SKA0130104)Guizhou Province Science and Technology Foundation(No.ZK[2022]304)+9 种基金the Major Science and Technology Program of Xinjiang Uygur Autonomous Region(Nos.2022A03013-2 and 2022A03013-4)the Scientific Research Project of the Guizhou Provincial Education(Nos.KY[2022]132,KY[2022]123 and KY[2022]137)the National Natural Science Foundation of China(Nos.11873080,U1731238,11565010,12103013,U1838109,U1831120,12273008 and 12103013)the Joint Research Fund in Astronomy under cooperative agreement between the National Natural Science Foundation of China and Chinese Academy of Sciences(No.U1931101)the Foundation of Guizhou Provincial Education Department(Nos.KY(2020)003 and KY(2021)303)the Guizhou Province Science and Technology Support Program(No.[2023]General 333)the 2021 project Xinjiang Uygur autonomous region of China for Tianshan elites,the Key Laboratory of Xinjiang Uygur Autonomous Region No.2020D04049the Academic New Seeding Fund Project of Guizhou Normal University(No.[2022]B18)the CAS Jianzhihua projectThe Parkes radio telescope is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO。
文摘In this paper,we presented the 23.3 yr of pulsar timing results of PSR J1456-6413 based on the observations of Parkes 64 m radio telescope.We detected two new glitches at MJD 57093(3)and 59060(12)and confirmed its first glitch at MJD 54554(10).The relative sizes(Δν/ν)of these two new glitches are 0.9×10^(-9)and 1.16×10^(-9),respectively.Using the“Cholesky”timing analysis method,we have determined its position,proper motion,and two-dimensional transverse velocities from the data segments before and after the second glitch,respectively.Furthermore,we detected exponential recovery behavior after the first glitch,with a recovery timescale of approximately 200 days and a corresponding exponential recovery factor Q of approximately 0.15(2),while no exponential recovery was detected for the other two glitches.More interestingly,we found that the leading component of the integral pulse profile after the second glitch became stronger,while the main component became weaker.Our results will expand the sample of pulsars with magnetosphere fluctuation triggered by the glitch event.
基金Supported by International Peace Maternal and Child Health Institute Clinical Research Program,No.YN201910Translational Medicine Cross Fund from Shanghai Jiao Tong University,No.YG2017QN38.
文摘BACKGROUND With the increasing trend of vaginal birth after caesarean delivery(VBAC),evaluation of the feasibility and safety of a second VBAC with grand multiparity is worth considering.Intrapartum uterine rupture is diagnosed in approximately one-fifth of all VBAC cases following successful vaginal delivery.To our knowledge,no report is available on the application of laparoscopy to repair postpartum uterine rupture after a successful second VBAC in China.CASE SUMMARY A 31-year-old woman(gravida 5,para 2)at 39 wk and 5 d of gestation was admitted to the hospital in labour.After a successful VBAC and observation for approximately 13 h,the patient complained of progressive abdominal pain.Given the symptoms,signs,and auxiliary examination results,intraperitoneal bleeding was considered.Because the patient was stable and ultrasound imaging was the only method available to assess the possibility of rupture,we recommended laparoscopy to clarify the diagnosis and for prompt laparoscopic uterine repair or exploratory laparotomy if necessary.Operative findings included transverse uterine scar rupture at the lower uterine segment of approximately 5.0 cm in length and 800 mL of intraoperative pelvic haemoperitoneum.Finally,she successfully underwent laparoscopic repair of uterine rupture and recovered very well according to three-dimensional magnetic resonance imaging at 42 d postpartum.CONCLUSION Routine postpartum intrauterine exploration is not beneficial to the mother and may even increase the risk of rupture.This case highlights a laparoscopic approach for repairing uterine rupture in the immediate postpartum period.