【摘 要】
：
Dear editor,Small target groups (STG), such as insect/bird [1]flocks and drone groups [2], have become new threats to civil aviation and urban security [3].With the advantages of long range and alltim
【出 处】
：
Science China(Information Sciences)
论文部分内容阅读
Dear editor,Small target groups (STG), such as insect/bird [1]flocks and drone groups [2], have become new threats to civil aviation and urban security [3].With the advantages of long range and alltime/all-weather operation capability, radar is one of
其他文献
Many plants can regenerate a new,complete plant from a cut twig or a detached leaf.But its underlying mechanism related to wound signaling remained elusive until a recent report appeared in Nature Pla
The early morning of August 31st witnessed the successful launching of a satellite for experiments under microgravity from Jiuquan Satellite Launching Center in northwestern China.Named"Taiji-1",this
为实现油菜作物模型的可视化研究,给油菜作物的数字化管理提供数据基础,以感染虫害的苗期油菜为研究对象,采用MVS序列图像技术,搭建MVS技术的序列图像采集平台。根据SFM和PMVS算法获得虫害油菜的稀疏点云数据和稠密点云数据,同时,探索序列图像数量对于特征点匹配的影响。对MVS序列图像技术获得的虫害油菜三维点云数据,采用滤波、精简、Alpha-Shape曲面重建等处理,得到虫害油菜的三维形态曲面模型
Because of highly intensive farming practices, crop plants could suffer relatively long terms of ammonium(NH_4~+) excess stress introduced by overdose application of nitrogen fertilizers. However, the
Soil water and nutrient status are both of major importance for plant appearance and growth performance.The objective of this study was to understand the effect of biochar(1.5%)and a biochar-compost m
提出一种多焦距图像融合方法,在该算法中构造用于焦点检测的全卷积网络(fully convolutional network for focus detection,FD-FCN)。为获得更精确的焦点检测图谱,在该网络中添加跳层,从而在生成图谱过程中同时提供详细和抽象的视觉信息。基于数据集CIFAR-10,为该网络构建一个新的训练数据集。运用FD-FCN的图像融合算法包含3个步骤:使用FD-FCN获
NASA于6月24日宣布,由于地面支持设备存在污染隐患,该局"毅力号"火星车的发射时间已被推迟到不早于7月22日。"毅力号"此前定于7月20日发射,但在将探测器封入宇宙神5火箭整流罩过程中出现了问题。NASA称,相关队伍需要有更多的时间来解决有效载荷危险勤务设施(PHSF)内地面支持管路存在的污染隐患。这是毅力号发射时间两周内第二次被推迟。发射原定7月17日进行,
在2020年"中国航天日"启动仪式上,国家航天局正式宣布我国首次火星探测任务被命名为"天问一号",同时公布的还有首次火星探测任务标识"揽星九天"。在"天问一号"任务开展之前,其他国家曾开展过大量火星探测任务。其中,作为航天大国,苏联/俄罗斯就曾开展过很多火星探测任务,有成功也有失败,苏俄火星探测的历史对今天的中国火星探测计划有着一定的借鉴意义。
地震是一种破坏性极大的突发性自然灾害。毁灭性的大地震是一种极可怕的天灾,往往造成建筑倒塌、设施损毁、交通堵塞、堤坝决口坍塌、人员伤亡,给人民生命财产和国家经济建设造成巨大的损失。地震应急演练工作已引起各级政府和有关部门的普遍重视,只有加大地震应急预案的培训和演练,才有可能对地震灾害快速精准地做出科学的应急决策。
Computer vision researchers prefer to estimate age from face images because facial features provide useful information. However, estimating age from face images becomes challenging when people are dis