In the archive of the Ground Wide Angle Camera(GWAC),we found 43 white light flares from 43 stars,among which,three are sympathetic or homologous flares,and one of them also has a quasi-periodic pulsation with a perio...In the archive of the Ground Wide Angle Camera(GWAC),we found 43 white light flares from 43 stars,among which,three are sympathetic or homologous flares,and one of them also has a quasi-periodic pulsation with a period of 13.0±1.5 minutes.Among these 43 flare stars,there are 19 new active stars and 41 stars that have available TESS and/or K2 light curves,from which we found 931 stellar flares.We also obtained rotational or orbital periods of 34 GWAC flare stars,of which 33 are less than 5.4 days,and ephemerides of three eclipsing binaries from these light curves.Combining with low resolution spectra from LAMOST and the Xinglong 2.16 m telescope,we found that L_(Hα)/L_(bol) are in the saturation region in the rotation-activity diagram.From the LAMOST medium-resolution spectrum,we found that Star#3(HAT 178-02667)has double Hαemissions which imply it is a binary,and two components are both active stars.Thirteen stars have flare frequency distributions(FFDs)from TESS and/or K2 light curves.These FFDs show that the flares detected by GWAC can occur at a frequency of 0.5to 9.5 yr^(-1).The impact of flares on habitable planets was also studied based on these FFDs,and flares from some GWAC flare stars may produce enough energetic flares to destroy ozone layers,but none can trigger prebiotic chemistry on their habitable planets.展开更多
目的探索临床路径在成人急性阑尾炎手术中的应用,是否在经济和安全上获益。方法我们研究110例16岁以上病理诊断为急性阑尾炎的病例,分为2组:应用临床路径组(C1inical Pathway Group简称CP组,n=55)和对照组(Historical Control Prepathwa...目的探索临床路径在成人急性阑尾炎手术中的应用,是否在经济和安全上获益。方法我们研究110例16岁以上病理诊断为急性阑尾炎的病例,分为2组:应用临床路径组(C1inical Pathway Group简称CP组,n=55)和对照组(Historical Control Prepathway Group简称HC组n=55)。CP组采用急性阑尾炎手术临床路径进行管理,HC组则采用传统方式进行诊断治疗。对年龄、性别、病理类型,住院时间、住院费用、抗生素使用、并发症的发生率进行比较。结果二组在年龄(P=0.98)、性别(P=0.41)、病理类型(P=0.91)均无显著差异,主要并发症的发生例数下降(1比3),但无显著差异(P=0.09)。抗生素使用天数下降(3.69比4.05),有显著差异(P=0.03);平均住院时间明显缩短(4.20对4.78)(P=0.006);住院费用下降(2761.45元对3000.34元)(P=0.126)。结论在急性阑尾炎手术的管理中,临床路径的应用有效而安全,它不仅降低住院时间、住院费用,还能降低应用抗生素的使用天数,而且不增加主要并发症的发生率。展开更多
基金supported by the National Natural Science Foundation of China(NSFC)with grant No.12073038supported by the Joint Research Fund in Astronomy U1931133 under cooperative agreement between the National Natural Science Foundation of China(NSFC)and Chinese Academy of Sciences(CAS)+1 种基金the NSFC with grant No.61941121the Beijing Natural Science Foundation,No.1222029。
文摘In the archive of the Ground Wide Angle Camera(GWAC),we found 43 white light flares from 43 stars,among which,three are sympathetic or homologous flares,and one of them also has a quasi-periodic pulsation with a period of 13.0±1.5 minutes.Among these 43 flare stars,there are 19 new active stars and 41 stars that have available TESS and/or K2 light curves,from which we found 931 stellar flares.We also obtained rotational or orbital periods of 34 GWAC flare stars,of which 33 are less than 5.4 days,and ephemerides of three eclipsing binaries from these light curves.Combining with low resolution spectra from LAMOST and the Xinglong 2.16 m telescope,we found that L_(Hα)/L_(bol) are in the saturation region in the rotation-activity diagram.From the LAMOST medium-resolution spectrum,we found that Star#3(HAT 178-02667)has double Hαemissions which imply it is a binary,and two components are both active stars.Thirteen stars have flare frequency distributions(FFDs)from TESS and/or K2 light curves.These FFDs show that the flares detected by GWAC can occur at a frequency of 0.5to 9.5 yr^(-1).The impact of flares on habitable planets was also studied based on these FFDs,and flares from some GWAC flare stars may produce enough energetic flares to destroy ozone layers,but none can trigger prebiotic chemistry on their habitable planets.
