The antarctic sea ice was investigated upon five occasions between January 4 and February 15, 2003. The investigations included: (1) estimation of sea ice distribution by ship-based observations between the middle Wed...The antarctic sea ice was investigated upon five occasions between January 4 and February 15, 2003. The investigations included: (1) estimation of sea ice distribution by ship-based observations between the middle Weddell Sea and the Prydz Bay; (2) estimation of sea ice distribution by aerial photography in the Prydz Bay; (3) direct measurements of fast ice thickness and snow cover, as well as ice core sampling in Nella Fjord; (4) estimation of melting sea ice distribution near the Zhongshan Station; and (5) observation of sea ice early freeze near the Zhongshan Station. On average, sea ice covered 14.4% of the study area. The highest sea ice concentration (80%) was observed in the Weddell Sea. First-year ice was dominant (99.7%~99.8%). Sea ice distributions in the Prydz Bay were more variable due to complex inshore topography, proximity of the Larsemann Hills, and/or grounded icebergs. The average thickness of landfast ice in Nella Fjord was 169.5 cm. Wind-blown snow redistribution plays an important role in affecting the ice thickness in Nella Fjord. Preliminary freezing of sea ice near the Zhongshan Station follows the first two phases of the pancake cycle.展开更多
目的对儿童颅底及颈部进行数字化三维重建,创建三维可视化模型。方法通过冷冻数控铣切及数字摄影技术获取1例中国6岁男童连续高精度超薄断层标本数字解剖图像数据集,选取从颅底至T_(1)上缘之间的横断面,利用PhotoShop.2021逐张进行手动...目的对儿童颅底及颈部进行数字化三维重建,创建三维可视化模型。方法通过冷冻数控铣切及数字摄影技术获取1例中国6岁男童连续高精度超薄断层标本数字解剖图像数据集,选取从颅底至T_(1)上缘之间的横断面,利用PhotoShop.2021逐张进行手动分割,使用三维重建软件Digihuman Reconstruction System将手动分割的结构重建,再导入3-matic Research 13.0软件进行调整和修改。结果成功建立首例中国男童的颅底及颈部三维可视化模型,多方位多角度清晰再现所分割结构三维形态及空间位置关系,完成对颅底及颈部椎骨、血管、神经及肌肉的详细观察,对颈部动静脉神经及椎体相关数据测量,分析解剖结构特点及手术注意事项。结论利用数字儿童颅底及颈部三维可视化模型,可多方位立体直观地显示详细解剖结构及毗邻关系,结合对颈部血管神经及椎体结构数据测量,为儿科临床诊治、虚拟手术、医学教学提供重要参考依据。展开更多
基金supported by the National Commonweal Research Project of China under contract No.2001DIA50040-03the National Natural Science Foundation of China under contract No.40271026.
文摘The antarctic sea ice was investigated upon five occasions between January 4 and February 15, 2003. The investigations included: (1) estimation of sea ice distribution by ship-based observations between the middle Weddell Sea and the Prydz Bay; (2) estimation of sea ice distribution by aerial photography in the Prydz Bay; (3) direct measurements of fast ice thickness and snow cover, as well as ice core sampling in Nella Fjord; (4) estimation of melting sea ice distribution near the Zhongshan Station; and (5) observation of sea ice early freeze near the Zhongshan Station. On average, sea ice covered 14.4% of the study area. The highest sea ice concentration (80%) was observed in the Weddell Sea. First-year ice was dominant (99.7%~99.8%). Sea ice distributions in the Prydz Bay were more variable due to complex inshore topography, proximity of the Larsemann Hills, and/or grounded icebergs. The average thickness of landfast ice in Nella Fjord was 169.5 cm. Wind-blown snow redistribution plays an important role in affecting the ice thickness in Nella Fjord. Preliminary freezing of sea ice near the Zhongshan Station follows the first two phases of the pancake cycle.
文摘目的对儿童颅底及颈部进行数字化三维重建,创建三维可视化模型。方法通过冷冻数控铣切及数字摄影技术获取1例中国6岁男童连续高精度超薄断层标本数字解剖图像数据集,选取从颅底至T_(1)上缘之间的横断面,利用PhotoShop.2021逐张进行手动分割,使用三维重建软件Digihuman Reconstruction System将手动分割的结构重建,再导入3-matic Research 13.0软件进行调整和修改。结果成功建立首例中国男童的颅底及颈部三维可视化模型,多方位多角度清晰再现所分割结构三维形态及空间位置关系,完成对颅底及颈部椎骨、血管、神经及肌肉的详细观察,对颈部动静脉神经及椎体相关数据测量,分析解剖结构特点及手术注意事项。结论利用数字儿童颅底及颈部三维可视化模型,可多方位立体直观地显示详细解剖结构及毗邻关系,结合对颈部血管神经及椎体结构数据测量,为儿科临床诊治、虚拟手术、医学教学提供重要参考依据。
