借助Web of Science文献数据库,以Packaging Technology and Science 2007—2014年间刊载的论文作为基础数据,利用Cite Space III软件绘制包装科学知识图谱,并据此研究包装科学知识的演进与发展规律。研究结果表明:PTS载文量整体呈现上...借助Web of Science文献数据库,以Packaging Technology and Science 2007—2014年间刊载的论文作为基础数据,利用Cite Space III软件绘制包装科学知识图谱,并据此研究包装科学知识的演进与发展规律。研究结果表明:PTS载文量整体呈现上升趋势;在国家/机构分布上,美国发文量居首位,荷兰中心性最大;关键词分析体现了PTS的办刊宗旨及研究范畴;从发文研究趋势和前沿分析来看,包装膜、包装储存、包装质量、活性包装、模型、阻隔性能、瓦楞纸板等形成了包装科学的研究热点,而包装材料、包装设计以及包装技术等成为包装科学的主要研究领域。展开更多
Detecting traffic anomalies is essential for diagnosing attacks. HighSp eed Backbone Net works （HSBN） require Traffic Anomaly Detection Systems （TADS） which are accurate （high detec tion and low false positive ra...Detecting traffic anomalies is essential for diagnosing attacks. HighSp eed Backbone Net works （HSBN） require Traffic Anomaly Detection Systems （TADS） which are accurate （high detec tion and low false positive rates） and efficient. The proposed approach utilizes entropy as traffic distributions metric over some traffic dimensions. An efficient algorithm, having low computational and space complexity, is used to estimate entro py. Entropy values over all dimensions are展开更多
The aftershock activity of the May 12, 2008 Wenchuan Ms8.0 Earthquake Sequence shows an obvious segmented feature. Most of the large aftershocks were distributed in the north and south parts of the aftershock zone. Th...The aftershock activity of the May 12, 2008 Wenchuan Ms8.0 Earthquake Sequence shows an obvious segmented feature. Most of the large aftershocks were distributed in the north and south parts of the aftershock zone. Thrusting was dominant with a small amount of strike-slip component in the south part. The aftershock activity decayed gradually, presenting the sequence features of a mainshock-aftershock pattern. The north part was the ending area of the malnshock fracture where strike-slipping was dominant, showing an obvious swarm feature. Therefore it became the major area for large aftershocks. The modulation of the earth tide on aftershock activity is remarkable; most large aftershocks occur during the period of flood and neap tide. The time period around 16：00 was the dominant occurring time for large aftershocks. The p-value, a parameter of modified Omori formula, increases gradually with time, and reaches about 1 at the end. Based on previous study, the sequence patterns, magnitude of maximum aftershock, as well as the duration of aftershock activity has been discussed. The primary results also show that the magnitude difference between the maiushock and the maximum aftershock is proportional to the rupture size of the maiushock for huge earthquakes of about Ms8.0. This means that when the magnitudes of the earthquakes are nearly the same, large rupture size corresponds to sufficient energy release.展开更多
文摘借助Web of Science文献数据库,以Packaging Technology and Science 2007—2014年间刊载的论文作为基础数据,利用Cite Space III软件绘制包装科学知识图谱,并据此研究包装科学知识的演进与发展规律。研究结果表明:PTS载文量整体呈现上升趋势;在国家/机构分布上,美国发文量居首位,荷兰中心性最大;关键词分析体现了PTS的办刊宗旨及研究范畴;从发文研究趋势和前沿分析来看,包装膜、包装储存、包装质量、活性包装、模型、阻隔性能、瓦楞纸板等形成了包装科学的研究热点,而包装材料、包装设计以及包装技术等成为包装科学的主要研究领域。
基金supported by the National High-Tech Research and Development Plan of China under Grant No.2011AA010702
文摘Detecting traffic anomalies is essential for diagnosing attacks. HighSp eed Backbone Net works （HSBN） require Traffic Anomaly Detection Systems （TADS） which are accurate （high detec tion and low false positive rates） and efficient. The proposed approach utilizes entropy as traffic distributions metric over some traffic dimensions. An efficient algorithm, having low computational and space complexity, is used to estimate entro py. Entropy values over all dimensions are
基金sponsored jointly by the Earthquake Scientific Research Program(200708020)the State Scientific and Technologic Support Programof the tenth"Five-Year Plan"(200704032006BAC01B030202)
文摘The aftershock activity of the May 12, 2008 Wenchuan Ms8.0 Earthquake Sequence shows an obvious segmented feature. Most of the large aftershocks were distributed in the north and south parts of the aftershock zone. Thrusting was dominant with a small amount of strike-slip component in the south part. The aftershock activity decayed gradually, presenting the sequence features of a mainshock-aftershock pattern. The north part was the ending area of the malnshock fracture where strike-slipping was dominant, showing an obvious swarm feature. Therefore it became the major area for large aftershocks. The modulation of the earth tide on aftershock activity is remarkable; most large aftershocks occur during the period of flood and neap tide. The time period around 16：00 was the dominant occurring time for large aftershocks. The p-value, a parameter of modified Omori formula, increases gradually with time, and reaches about 1 at the end. Based on previous study, the sequence patterns, magnitude of maximum aftershock, as well as the duration of aftershock activity has been discussed. The primary results also show that the magnitude difference between the maiushock and the maximum aftershock is proportional to the rupture size of the maiushock for huge earthquakes of about Ms8.0. This means that when the magnitudes of the earthquakes are nearly the same, large rupture size corresponds to sufficient energy release.
