The near-seabed multichannel seismic exploration systems have yielded remarkable successes in marine geological disaster assessment,marine gas hydrate investigation,and deep-sea mineral exploration owing to their high...The near-seabed multichannel seismic exploration systems have yielded remarkable successes in marine geological disaster assessment,marine gas hydrate investigation,and deep-sea mineral exploration owing to their high vertical and horizontal resolution.However,the quality of deep-towed seismic imaging hinges on accurate source-receiver positioning information.In light of existing technical problems,we propose a novel array geometry inversion method tailored for high-resolution deep-towed multichannel seismic exploration systems.This method is independent of the attitude and depth sensors along a deep-towed seismic streamer,accounting for variations in seawater velocity and seabed slope angle.Our approach decomposes the towed line array into multiline segments and characterizes its geometric shape using the line segment distance and pitch angle.Introducing optimization parameters for seawater velocity and seabed slope angle,we establish an objective function based on the model,yielding results that align with objective reality.Employing the particle swarm optimization algorithm enables synchronous acquisition of optimized inversion results for array geometry and seawater velocity.Experimental validation using theoretical models and practical data verifies that our approach effectively enhances source and receiver positioning inversion accuracy.The algorithm exhibits robust stability and reliability,addressing uncertainties in seismic traveltime picking and complex seabed topography conditions.展开更多
以Web of Science核心合集和中国知网收录的592篇反兴奋剂研究主题的文献为研究对象,借助CiteSpace软件对国内外反兴奋剂研究发文趋势、作者、机构、研究热点及趋势进行分析。结果显示:体育领域反兴奋剂研究起于20世纪90年代,呈现缓慢...以Web of Science核心合集和中国知网收录的592篇反兴奋剂研究主题的文献为研究对象,借助CiteSpace软件对国内外反兴奋剂研究发文趋势、作者、机构、研究热点及趋势进行分析。结果显示:体育领域反兴奋剂研究起于20世纪90年代,呈现缓慢起步、波浪式发展的研究趋势,研究高峰多集中于奥运会前后;国内杨彬龄是该领域的核心作者,但学者间尚未形成稳定的合作关系;国外没有突出的核心研究者,大多较为均衡,且合作关系较为密集;国内研究机构以北京体育大学和湘潭大学为核心,但各机构之间缺乏合作,多以独立研究为主;国外以哥本哈根大学为核心,且较多机构合作紧密;我国学者在反兴奋剂的社会文化学、法理学等层面有着丰富的学术理论探讨,国外更注重于兴奋剂检测技术的开发与实践。建议国内学者、机构之间加强合作,进一步提高高产作者和高产机构的数量,鼓励研究人员从不同角度对反兴奋剂问题进行关注与研究,聚焦于高水平运动员的调查、检测技术的实证研究、社会心理学调研等前沿问题。展开更多
基金supported by the special funds of Laoshan Laboratory(No.LSKJ202203604)the National Key Research and Development Program of China(No.2016 YFC0303901).
文摘The near-seabed multichannel seismic exploration systems have yielded remarkable successes in marine geological disaster assessment,marine gas hydrate investigation,and deep-sea mineral exploration owing to their high vertical and horizontal resolution.However,the quality of deep-towed seismic imaging hinges on accurate source-receiver positioning information.In light of existing technical problems,we propose a novel array geometry inversion method tailored for high-resolution deep-towed multichannel seismic exploration systems.This method is independent of the attitude and depth sensors along a deep-towed seismic streamer,accounting for variations in seawater velocity and seabed slope angle.Our approach decomposes the towed line array into multiline segments and characterizes its geometric shape using the line segment distance and pitch angle.Introducing optimization parameters for seawater velocity and seabed slope angle,we establish an objective function based on the model,yielding results that align with objective reality.Employing the particle swarm optimization algorithm enables synchronous acquisition of optimized inversion results for array geometry and seawater velocity.Experimental validation using theoretical models and practical data verifies that our approach effectively enhances source and receiver positioning inversion accuracy.The algorithm exhibits robust stability and reliability,addressing uncertainties in seismic traveltime picking and complex seabed topography conditions.
文摘以Web of Science核心合集和中国知网收录的592篇反兴奋剂研究主题的文献为研究对象,借助CiteSpace软件对国内外反兴奋剂研究发文趋势、作者、机构、研究热点及趋势进行分析。结果显示:体育领域反兴奋剂研究起于20世纪90年代,呈现缓慢起步、波浪式发展的研究趋势,研究高峰多集中于奥运会前后;国内杨彬龄是该领域的核心作者,但学者间尚未形成稳定的合作关系;国外没有突出的核心研究者,大多较为均衡,且合作关系较为密集;国内研究机构以北京体育大学和湘潭大学为核心,但各机构之间缺乏合作,多以独立研究为主;国外以哥本哈根大学为核心,且较多机构合作紧密;我国学者在反兴奋剂的社会文化学、法理学等层面有着丰富的学术理论探讨,国外更注重于兴奋剂检测技术的开发与实践。建议国内学者、机构之间加强合作,进一步提高高产作者和高产机构的数量,鼓励研究人员从不同角度对反兴奋剂问题进行关注与研究,聚焦于高水平运动员的调查、检测技术的实证研究、社会心理学调研等前沿问题。