在对欧空局火星快车探测器搭载的MARSIS雷达的浅表层探测数据进行校准过程中,获得了火星电离层的总电子含量(total electron content,TEC)观测数据。利用该数据,计算火星低纬度地区电离层的峰值电子密度和标高;并对其进行统计分析发现,...在对欧空局火星快车探测器搭载的MARSIS雷达的浅表层探测数据进行校准过程中,获得了火星电离层的总电子含量(total electron content,TEC)观测数据。利用该数据,计算火星低纬度地区电离层的峰值电子密度和标高;并对其进行统计分析发现,在低纬度地区,火星冬季电离层的标高和峰值电子密度均较夏季高,即冬季电离层较夏季更显著,且春季电离层的电子密度梯度最大。展开更多
目的:探讨老年病人医用胶粘剂相关性皮肤损伤(medical adhesive related skin injury,MARSI)的危险因素,为临床预防提供参考依据。方法:计算机检索PubMed、Cochrane Library、Web of Science、EMbase、中国生物医学文献数据库(CBM)、中...目的:探讨老年病人医用胶粘剂相关性皮肤损伤(medical adhesive related skin injury,MARSI)的危险因素,为临床预防提供参考依据。方法:计算机检索PubMed、Cochrane Library、Web of Science、EMbase、中国生物医学文献数据库(CBM)、中国知网、万方及维普数据库,检索时限从建库至2020年6月。纳入队列研究、病例对照研究及横断面研究,采用定性分析的方法归纳老年病人医用胶粘剂相关性皮肤损伤的危险因素。结果:共纳入7项研究,结果显示MARSI的危险因素分为5个方面,包括人口学特征、皮肤因素、自理能力、胶粘剂因素、使用药物。结论:MARSI发生率较高,相关因素涉及多个方面,医务人员应根据其危险因素,结合临床证据,制订预防措施,降低MARSI的发生率。展开更多
The Mars Advanced Radar for Subsurface and Ionosphere Sounding(MARSIS) onboard the Mars Express(MEX) spacecraft started to collect data of the Martian topside ionosphere from May,2005.By now a large amount of ionogram...The Mars Advanced Radar for Subsurface and Ionosphere Sounding(MARSIS) onboard the Mars Express(MEX) spacecraft started to collect data of the Martian topside ionosphere from May,2005.By now a large amount of ionograms has been obtained.It is important to extract vertical ionospheric information effectively from the ionograms for further study.In this paper a new method,Object Tracking Method(OTM),is proposed to automatically extract the ionospheric electron density profiles by computer.This method is based on three algorithms,namely the Hough transform,region growing segmentation algorithm and moving objects detection method from video sequences.In processing ionosphere echoes are treated as moving objects.The identification ratio of OTM for the MARSIS ionograms is estimated to be around 90%.展开更多
文摘在对欧空局火星快车探测器搭载的MARSIS雷达的浅表层探测数据进行校准过程中,获得了火星电离层的总电子含量(total electron content,TEC)观测数据。利用该数据,计算火星低纬度地区电离层的峰值电子密度和标高;并对其进行统计分析发现,在低纬度地区,火星冬季电离层的标高和峰值电子密度均较夏季高,即冬季电离层较夏季更显著,且春季电离层的电子密度梯度最大。
文摘目的:探讨老年病人医用胶粘剂相关性皮肤损伤(medical adhesive related skin injury,MARSI)的危险因素,为临床预防提供参考依据。方法:计算机检索PubMed、Cochrane Library、Web of Science、EMbase、中国生物医学文献数据库(CBM)、中国知网、万方及维普数据库,检索时限从建库至2020年6月。纳入队列研究、病例对照研究及横断面研究,采用定性分析的方法归纳老年病人医用胶粘剂相关性皮肤损伤的危险因素。结果:共纳入7项研究,结果显示MARSI的危险因素分为5个方面,包括人口学特征、皮肤因素、自理能力、胶粘剂因素、使用药物。结论:MARSI发生率较高,相关因素涉及多个方面,医务人员应根据其危险因素,结合临床证据,制订预防措施,降低MARSI的发生率。
基金supported by the National Natural Science Foundation of China(Grant Nos. 10973031,2008AA12A210 and 2010AA122206)
文摘The Mars Advanced Radar for Subsurface and Ionosphere Sounding(MARSIS) onboard the Mars Express(MEX) spacecraft started to collect data of the Martian topside ionosphere from May,2005.By now a large amount of ionograms has been obtained.It is important to extract vertical ionospheric information effectively from the ionograms for further study.In this paper a new method,Object Tracking Method(OTM),is proposed to automatically extract the ionospheric electron density profiles by computer.This method is based on three algorithms,namely the Hough transform,region growing segmentation algorithm and moving objects detection method from video sequences.In processing ionosphere echoes are treated as moving objects.The identification ratio of OTM for the MARSIS ionograms is estimated to be around 90%.
