目的探讨绿道专职护士主导的急性缺血性脑卒中(acute ischemic stroke,AIS)溶栓救治模式的应用效果。方法选取2021年3月—2023年2月深圳市某三级甲等综合医院急诊科收治的124例AIS静脉溶栓治疗患者为研究对象。其中2021年3月—2022年2...目的探讨绿道专职护士主导的急性缺血性脑卒中(acute ischemic stroke,AIS)溶栓救治模式的应用效果。方法选取2021年3月—2023年2月深圳市某三级甲等综合医院急诊科收治的124例AIS静脉溶栓治疗患者为研究对象。其中2021年3月—2022年2月61例AIS患者为对照组,采用常规救治模式接诊溶栓;2022年3月—2023年2月的63例AIS患者为干预组,采用以绿道专职护士为主导的模式接诊溶栓。比较两组患者入院至完成CT所用时间、溶栓知情同意谈话时间、入院至静脉溶栓开始时间(door to needle time,DNT)、DNT 60min达标率、溶栓前后美国国立卫生院卒中量表(national institute of health stroke scale,NIHSS)评分及患者就诊满意度。结果干预组入院至完成CT检查所用时间、溶栓知情同意谈话时间、DNT均短于对照组,干预组DNT 60min达标率高于对照组,溶栓前后干预组NIHSS评分降幅较对照组大,两组比较,差异具有统计学意义(均P<0.05)。干预组患者就诊满意度高于对照组,两组比较,差异具有统计学意义(P<0.05)。结论以绿道专职护士为主导的AIS静脉溶栓救治模式可有效缩短患者入院至完成CT检查所用时间、溶栓知情同意谈话时间、DNT时间,降低患者NIHSS评分,提高DNT 60 min达标率及患者就诊满意度。展开更多
针对功率预测算法下光伏最大功率点跟踪(maximum power point tracking,MPPT)系统中存在误判情况的问题,提出一种基于拉格朗日插值法改进功率预测的光伏变步长扰动观察法。首先,通过拉格朗日插值法建立插值模型,以减少预测功率值与实际...针对功率预测算法下光伏最大功率点跟踪(maximum power point tracking,MPPT)系统中存在误判情况的问题,提出一种基于拉格朗日插值法改进功率预测的光伏变步长扰动观察法。首先,通过拉格朗日插值法建立插值模型,以减少预测功率值与实际功率值的偏差;其次,通过对反正切函数归一化的变步长追踪方法改善算法在辐照强度变化及追踪过程中变步长方法引起较大振荡的问题;最后,基于MATLAB/Simulink开展与传统扰动观察法及功率预测算法对比的试验。结果表明:改进功率预测变步长扰动观察法改善误判和失效问题的效果更好。展开更多
Formamidinium lead bromide(FAPbBr_(3))nanocrystals(NCs)have been considered to be a good optoelectronic material due to their pure green emission,excellent stability and superior carrier transport characteristics.Howe...Formamidinium lead bromide(FAPbBr_(3))nanocrystals(NCs)have been considered to be a good optoelectronic material due to their pure green emission,excellent stability and superior carrier transport characteristics.However,two-photon pumped amplified spontaneous emission(ASE)and the corresponding nonlinear optical properties of FAPbBr_(3) NCs are scarcely revealed.Herein,we synthesized colloidal FAPbBr_(3) NCs with different sizes by changing the molar ratio of FABr/PbBr_(2) in the precursor solution,using ligand assisted precipitation(LARP)technology at room temperature.Photoluminescence(PL)and time resolved photoluminescence(TRPL)spectroscopy were measured to characterize their ASE properties.And their nonlinear optical properties were studied through the Zscan technique and the two-photon excited fluorescence method.The stimulated emission properties including oneand two-photon pumped ASE have been realized from FAPbBr_(3) NCs.With large two-photon absorption coefficient(0.27 cm/GW)and high non-linear absorption cross-section(7.52×10^(5) GM),ASE with threshold as low as 9.8μJ/cm^(2) and 487μJ/cm^(2) have been obtained from colloidal FAPbBr_(3) NCs using one-and two-photon excitations.These results indicate that as a new possible green-emitting frequency-upconversion material with low thresholds,FAPbBr_(3) NCs hold great potential in the development of high-performance two-photon pump lasers.展开更多
文摘目的探讨绿道专职护士主导的急性缺血性脑卒中(acute ischemic stroke,AIS)溶栓救治模式的应用效果。方法选取2021年3月—2023年2月深圳市某三级甲等综合医院急诊科收治的124例AIS静脉溶栓治疗患者为研究对象。其中2021年3月—2022年2月61例AIS患者为对照组,采用常规救治模式接诊溶栓;2022年3月—2023年2月的63例AIS患者为干预组,采用以绿道专职护士为主导的模式接诊溶栓。比较两组患者入院至完成CT所用时间、溶栓知情同意谈话时间、入院至静脉溶栓开始时间(door to needle time,DNT)、DNT 60min达标率、溶栓前后美国国立卫生院卒中量表(national institute of health stroke scale,NIHSS)评分及患者就诊满意度。结果干预组入院至完成CT检查所用时间、溶栓知情同意谈话时间、DNT均短于对照组,干预组DNT 60min达标率高于对照组,溶栓前后干预组NIHSS评分降幅较对照组大,两组比较,差异具有统计学意义(均P<0.05)。干预组患者就诊满意度高于对照组,两组比较,差异具有统计学意义(P<0.05)。结论以绿道专职护士为主导的AIS静脉溶栓救治模式可有效缩短患者入院至完成CT检查所用时间、溶栓知情同意谈话时间、DNT时间,降低患者NIHSS评分,提高DNT 60 min达标率及患者就诊满意度。
文摘针对功率预测算法下光伏最大功率点跟踪(maximum power point tracking,MPPT)系统中存在误判情况的问题,提出一种基于拉格朗日插值法改进功率预测的光伏变步长扰动观察法。首先,通过拉格朗日插值法建立插值模型,以减少预测功率值与实际功率值的偏差;其次,通过对反正切函数归一化的变步长追踪方法改善算法在辐照强度变化及追踪过程中变步长方法引起较大振荡的问题;最后,基于MATLAB/Simulink开展与传统扰动观察法及功率预测算法对比的试验。结果表明:改进功率预测变步长扰动观察法改善误判和失效问题的效果更好。
文摘Formamidinium lead bromide(FAPbBr_(3))nanocrystals(NCs)have been considered to be a good optoelectronic material due to their pure green emission,excellent stability and superior carrier transport characteristics.However,two-photon pumped amplified spontaneous emission(ASE)and the corresponding nonlinear optical properties of FAPbBr_(3) NCs are scarcely revealed.Herein,we synthesized colloidal FAPbBr_(3) NCs with different sizes by changing the molar ratio of FABr/PbBr_(2) in the precursor solution,using ligand assisted precipitation(LARP)technology at room temperature.Photoluminescence(PL)and time resolved photoluminescence(TRPL)spectroscopy were measured to characterize their ASE properties.And their nonlinear optical properties were studied through the Zscan technique and the two-photon excited fluorescence method.The stimulated emission properties including oneand two-photon pumped ASE have been realized from FAPbBr_(3) NCs.With large two-photon absorption coefficient(0.27 cm/GW)and high non-linear absorption cross-section(7.52×10^(5) GM),ASE with threshold as low as 9.8μJ/cm^(2) and 487μJ/cm^(2) have been obtained from colloidal FAPbBr_(3) NCs using one-and two-photon excitations.These results indicate that as a new possible green-emitting frequency-upconversion material with low thresholds,FAPbBr_(3) NCs hold great potential in the development of high-performance two-photon pump lasers.
