目的探讨脐静脉置管在超低、极低出生体重儿中的应用价值。方法选取2022年10月~2023年12月哈尔滨医科大学附属第一医院新生儿科收治的超低、极低出生体重早产儿56例,随机分为观察组、对照组,各28例,观察组使用脐静脉置管,对照组采用传...目的探讨脐静脉置管在超低、极低出生体重儿中的应用价值。方法选取2022年10月~2023年12月哈尔滨医科大学附属第一医院新生儿科收治的超低、极低出生体重早产儿56例,随机分为观察组、对照组,各28例,观察组使用脐静脉置管,对照组采用传统外周静脉穿刺,比较两组早产儿达到足量喂养时间、恢复出生体重时间、出院时体重、每日平均体重增长、住院天数、住院费用、新生儿坏死性小肠结肠炎(necrotizing enterocolitis of the newborn,NEC)并发症情况。结果观察组早产儿在达到足量喂养时间、恢复出生体重时间、出院时体重、每日平均体重增长方面均优于对照组,同时观察组早产儿住院天数、住院费用均少于对照组,差异有统计学意义(P<0.05);两组NEC发生率无明显统计学差异(P>0.05)。结论超低、极低出生体重早产儿使用脐静脉置管,有助更早达到足量喂养、恢复出生体重,在出院时获得更优体重、每日平均体重增长更快,同时有助缩短住院天数,减少住院费用,具有临床应用价值。展开更多
Microwave-to-optical phase synchronization techniques have attracted growing research interests in recent years. Here, we demonstrate tight, real-time phase synchronization of an optical frequency comb to a rubidium a...Microwave-to-optical phase synchronization techniques have attracted growing research interests in recent years. Here, we demonstrate tight, real-time phase synchronization of an optical frequency comb to a rubidium atomic clock. A detailed mathematical model of the phase locking system is developed to optimize its built-in parameters. Based on the model, we fabricate a phase locking circuit with high integration. Once synchronized, the fractional frequency instability of the repetition rate agrees to 6.35×10^(-12) at 1 s and the standard deviation is 1.5 mHz, which indicates the phase synchronization system can implement high-precision stabilization. This integrated stable laser comb should enable a wide range of applications beyond the laboratory.展开更多
文摘目的探讨脐静脉置管在超低、极低出生体重儿中的应用价值。方法选取2022年10月~2023年12月哈尔滨医科大学附属第一医院新生儿科收治的超低、极低出生体重早产儿56例,随机分为观察组、对照组,各28例,观察组使用脐静脉置管,对照组采用传统外周静脉穿刺,比较两组早产儿达到足量喂养时间、恢复出生体重时间、出院时体重、每日平均体重增长、住院天数、住院费用、新生儿坏死性小肠结肠炎(necrotizing enterocolitis of the newborn,NEC)并发症情况。结果观察组早产儿在达到足量喂养时间、恢复出生体重时间、出院时体重、每日平均体重增长方面均优于对照组,同时观察组早产儿住院天数、住院费用均少于对照组,差异有统计学意义(P<0.05);两组NEC发生率无明显统计学差异(P>0.05)。结论超低、极低出生体重早产儿使用脐静脉置管,有助更早达到足量喂养、恢复出生体重,在出院时获得更优体重、每日平均体重增长更快,同时有助缩短住院天数,减少住院费用,具有临床应用价值。
基金This work has been supported by the National Natural Science Foundation of China(Nos.61571244 and 61871239)the Tianjin Research Program of Application Foundation and Advanced Technology(No.18YFZCGX00480)。
文摘Microwave-to-optical phase synchronization techniques have attracted growing research interests in recent years. Here, we demonstrate tight, real-time phase synchronization of an optical frequency comb to a rubidium atomic clock. A detailed mathematical model of the phase locking system is developed to optimize its built-in parameters. Based on the model, we fabricate a phase locking circuit with high integration. Once synchronized, the fractional frequency instability of the repetition rate agrees to 6.35×10^(-12) at 1 s and the standard deviation is 1.5 mHz, which indicates the phase synchronization system can implement high-precision stabilization. This integrated stable laser comb should enable a wide range of applications beyond the laboratory.
