[目的]探讨改良Z-Track肌内注射法在体外受精-胚胎移植(IVF-ET)病人黄体酮注射中的应用效果。[方法]采用前瞻性随机对照研究方法,将纳入研究的122例IVF-ET病人按照随机数字表法分为观察组和对照组各61例。对照组采用常规肌内注射法,观...[目的]探讨改良Z-Track肌内注射法在体外受精-胚胎移植(IVF-ET)病人黄体酮注射中的应用效果。[方法]采用前瞻性随机对照研究方法,将纳入研究的122例IVF-ET病人按照随机数字表法分为观察组和对照组各61例。对照组采用常规肌内注射法,观察组根据病人不同体质指数,采用改良Z-Track肌内注射法。比较两组给药7 d内注射部位不良反应发生情况。[结果]观察组局部硬结发生率显著低于对照组,组间比较差异有统计学意义(χ 2=6.917, P <0.05);观察组疼痛程度显著低于对照组,组间比较差异有统计学意义( Z =6.622, P <0.05)。[结论]根据病人不同体质指数,采用改良Z-Track肌内注射法进行黄体酮臀部肌内注射,可有效减少局部不良反应,确保用药安全。展开更多
This paper considers the tracking performance problem of a model reference robust control (MRRC) for plants with relative degree greater than one. A new algorithm is proposed based on the earlier research. It is shown...This paper considers the tracking performance problem of a model reference robust control (MRRC) for plants with relative degree greater than one. A new algorithm is proposed based on the earlier research. It is shown that by applying a special transformation to the tracking system,the L∞ bound of the tracking error can be achieved even when the high frequency gain is unknown,and both the tracking performance and the control effort can be improved significantly. Furthermore,the strictly positive real (SPR) condition, which is an essential assumption of the earlier design, can be removed.展开更多
联合甚长基线干涉测量(very long baseline interferometry,VLBI)时延数据与转发式(orbit determination by transfer tracking,ODTT)测距数据能够有效提高地球静止轨道(geostationary earth orbit,GEO)卫星定轨精度。参照位置精度衰减...联合甚长基线干涉测量(very long baseline interferometry,VLBI)时延数据与转发式(orbit determination by transfer tracking,ODTT)测距数据能够有效提高地球静止轨道(geostationary earth orbit,GEO)卫星定轨精度。参照位置精度衰减因子(position dilution of precision,PDOP)的改变,研究不同VLBI基线时延数据与转发式测距数据的联合对GEO卫星定轨精度的改善,可为特定条件下联合观测时VLBI基线的最优选择提供参考。基于中国科学院国家授时中心宽带VLBI系统和转发式测轨系统的实测数据,开展中星12号GEO卫星的定轨试验。试验结果表明定轨精度的提高与PDOP的降低成正相关。相比于转发式单独定轨,联合VLBI系统中的喀什—三亚基线,PDOP降低了3.00,定轨精度提高了11.48%;联合VLBI系统中的吉林—喀什基线,PDOP降低了3.38,定轨精度提高了14.73%;联合VLBI系统中的吉林—三亚基线,PDOP降低了6.90,定轨精度提高了19.75%;联合VLBI系统中的吉林—三亚和吉林—喀什两条基线,PDOP降低了9.94,定轨精度提高了27.23%。展开更多
文摘[目的]探讨改良Z-Track肌内注射法在体外受精-胚胎移植(IVF-ET)病人黄体酮注射中的应用效果。[方法]采用前瞻性随机对照研究方法,将纳入研究的122例IVF-ET病人按照随机数字表法分为观察组和对照组各61例。对照组采用常规肌内注射法,观察组根据病人不同体质指数,采用改良Z-Track肌内注射法。比较两组给药7 d内注射部位不良反应发生情况。[结果]观察组局部硬结发生率显著低于对照组,组间比较差异有统计学意义(χ 2=6.917, P <0.05);观察组疼痛程度显著低于对照组,组间比较差异有统计学意义( Z =6.622, P <0.05)。[结论]根据病人不同体质指数,采用改良Z-Track肌内注射法进行黄体酮臀部肌内注射,可有效减少局部不良反应,确保用药安全。
基金Supported by Natural Science Foundation of P. R. China (60174001)Natural Science Foundation of Beijing (4022007)
文摘This paper considers the tracking performance problem of a model reference robust control (MRRC) for plants with relative degree greater than one. A new algorithm is proposed based on the earlier research. It is shown that by applying a special transformation to the tracking system,the L∞ bound of the tracking error can be achieved even when the high frequency gain is unknown,and both the tracking performance and the control effort can be improved significantly. Furthermore,the strictly positive real (SPR) condition, which is an essential assumption of the earlier design, can be removed.
文摘联合甚长基线干涉测量(very long baseline interferometry,VLBI)时延数据与转发式(orbit determination by transfer tracking,ODTT)测距数据能够有效提高地球静止轨道(geostationary earth orbit,GEO)卫星定轨精度。参照位置精度衰减因子(position dilution of precision,PDOP)的改变,研究不同VLBI基线时延数据与转发式测距数据的联合对GEO卫星定轨精度的改善,可为特定条件下联合观测时VLBI基线的最优选择提供参考。基于中国科学院国家授时中心宽带VLBI系统和转发式测轨系统的实测数据,开展中星12号GEO卫星的定轨试验。试验结果表明定轨精度的提高与PDOP的降低成正相关。相比于转发式单独定轨,联合VLBI系统中的喀什—三亚基线,PDOP降低了3.00,定轨精度提高了11.48%;联合VLBI系统中的吉林—喀什基线,PDOP降低了3.38,定轨精度提高了14.73%;联合VLBI系统中的吉林—三亚基线,PDOP降低了6.90,定轨精度提高了19.75%;联合VLBI系统中的吉林—三亚和吉林—喀什两条基线,PDOP降低了9.94,定轨精度提高了27.23%。
