This paper presents the design,calibration,and survey strategy of the Fast Radio Burst(FRB)digital backend and its real-time data processing pipeline employed in the Tianlai Cylinder Pathfinder Array.The array,consist...This paper presents the design,calibration,and survey strategy of the Fast Radio Burst(FRB)digital backend and its real-time data processing pipeline employed in the Tianlai Cylinder Pathfinder Array.The array,consisting of three parallel cylindrical reflectors and equipped with 96 dual-polarization feeds,is a radio interferometer array designed for conducting drift scans of the northern celestial semi-sphere.The FRB digital backend enables the formation of 96 digital beams,effectively covering an area of approximately 40 square degrees with the 3 dB beam.Our pipeline demonstrates the capability to conduct an automatic search of FRBs,detecting at quasi-realtime and classifying FRB candidates automatically.The current FRB searching pipeline has an overall recall rate of88%.During the commissioning phase,we successfully detected signals emitted by four well-known pulsars:PSR B0329+54,B2021+51,B0823+26,and B2020+28.We report the first discovery of an FRB by our array,designated as FRB 20220414A.We also investigate the optimal arrangement for the digitally formed beams to achieve maximum detection rate by numerical simulation.展开更多
目的评估3D个体化打印椎弓根螺钉导向置入在强直性脊柱炎患者胸腰椎骨折中的应用效果。方法回顾性选取2019年1月—2022年10月在西南医科大学附属医院治疗的104例强直性脊柱炎合并胸腰椎骨折患者的临床资料。根据不同置钉方式分为观察组...目的评估3D个体化打印椎弓根螺钉导向置入在强直性脊柱炎患者胸腰椎骨折中的应用效果。方法回顾性选取2019年1月—2022年10月在西南医科大学附属医院治疗的104例强直性脊柱炎合并胸腰椎骨折患者的临床资料。根据不同置钉方式分为观察组和对照组,分别有53、51例。观察组进行3D打印椎弓根导板辅助置钉;对照组采用传统X射线辅助徒手置钉。比较两组患者围手术期指标、术后1 d的应激指标[血清促肾上腺皮质激素(ACTH)、皮质醇(Cor)],并对比术前和术后12个月的视觉模拟评分法(VAS)、日本骨科协会腰椎功能评分(JOA)、骨代谢指标[骨钙素、骨碱性磷酸酶(BALP)]、脊柱三维运动范围、伤椎Cobb角、伤椎前缘高度和后缘高度。结果观察组手术时间、置钉时间、切口长度短于对照组(P<0.05),术中出血量低于对照组(P<0.05),螺钉调整次数少于对照组(P<0.05)。观察组术后1 d ACTH、Cor水平均低于对照组(P<0.05)。观察组手术前后ACTH、Cor的差值均低于观察组(P<0.05)。观察组术后12个月VAS评分均低于对照组(P<0.05),JOA评分、骨钙素、BALP均高于对照组(P<0.05)。观察组患者手术前后VAS评分、JOA评分、骨钙素、BALP的差值均高于观察组(P<0.05)。观察组术后12个月脊柱前屈、后伸、侧屈和旋转范围均大于对照组(P<0.05)。观察组手术前后脊柱前屈、后伸、侧屈和旋转范围的差值均高于观察组(P<0.05)。观察组术后12个月的伤椎前缘高度、后缘高度均高于对照组(P<0.05),伤椎Cobb角低于对照组(P<0.05)。观察组手术前后伤椎Cobb角、伤椎前缘高度和后缘高度的差值均高于观察组(P<0.05)。结论3D个体化打印导向器引导的椎弓根置入有助于强直性脊柱炎患者胸腰椎骨折后的恢复。展开更多
基金support of the National SKA program of China(Nos.2022SKA0110100 and 2022SKA0110101)the National Natural Science Foundation of China(NSFC,Grant Nos.1236114814,12203061,12273070,and 12303004)。
文摘This paper presents the design,calibration,and survey strategy of the Fast Radio Burst(FRB)digital backend and its real-time data processing pipeline employed in the Tianlai Cylinder Pathfinder Array.The array,consisting of three parallel cylindrical reflectors and equipped with 96 dual-polarization feeds,is a radio interferometer array designed for conducting drift scans of the northern celestial semi-sphere.The FRB digital backend enables the formation of 96 digital beams,effectively covering an area of approximately 40 square degrees with the 3 dB beam.Our pipeline demonstrates the capability to conduct an automatic search of FRBs,detecting at quasi-realtime and classifying FRB candidates automatically.The current FRB searching pipeline has an overall recall rate of88%.During the commissioning phase,we successfully detected signals emitted by four well-known pulsars:PSR B0329+54,B2021+51,B0823+26,and B2020+28.We report the first discovery of an FRB by our array,designated as FRB 20220414A.We also investigate the optimal arrangement for the digitally formed beams to achieve maximum detection rate by numerical simulation.
文摘目的评估3D个体化打印椎弓根螺钉导向置入在强直性脊柱炎患者胸腰椎骨折中的应用效果。方法回顾性选取2019年1月—2022年10月在西南医科大学附属医院治疗的104例强直性脊柱炎合并胸腰椎骨折患者的临床资料。根据不同置钉方式分为观察组和对照组,分别有53、51例。观察组进行3D打印椎弓根导板辅助置钉;对照组采用传统X射线辅助徒手置钉。比较两组患者围手术期指标、术后1 d的应激指标[血清促肾上腺皮质激素(ACTH)、皮质醇(Cor)],并对比术前和术后12个月的视觉模拟评分法(VAS)、日本骨科协会腰椎功能评分(JOA)、骨代谢指标[骨钙素、骨碱性磷酸酶(BALP)]、脊柱三维运动范围、伤椎Cobb角、伤椎前缘高度和后缘高度。结果观察组手术时间、置钉时间、切口长度短于对照组(P<0.05),术中出血量低于对照组(P<0.05),螺钉调整次数少于对照组(P<0.05)。观察组术后1 d ACTH、Cor水平均低于对照组(P<0.05)。观察组手术前后ACTH、Cor的差值均低于观察组(P<0.05)。观察组术后12个月VAS评分均低于对照组(P<0.05),JOA评分、骨钙素、BALP均高于对照组(P<0.05)。观察组患者手术前后VAS评分、JOA评分、骨钙素、BALP的差值均高于观察组(P<0.05)。观察组术后12个月脊柱前屈、后伸、侧屈和旋转范围均大于对照组(P<0.05)。观察组手术前后脊柱前屈、后伸、侧屈和旋转范围的差值均高于观察组(P<0.05)。观察组术后12个月的伤椎前缘高度、后缘高度均高于对照组(P<0.05),伤椎Cobb角低于对照组(P<0.05)。观察组手术前后伤椎Cobb角、伤椎前缘高度和后缘高度的差值均高于观察组(P<0.05)。结论3D个体化打印导向器引导的椎弓根置入有助于强直性脊柱炎患者胸腰椎骨折后的恢复。
