The waveguide invariant,denoted asβ,can be used to describe the slope of the intensity of a broadband acoustic signal.In deep water,the interference patterns of the areas with dominant waterborne modes and only with ...The waveguide invariant,denoted asβ,can be used to describe the slope of the intensity of a broadband acoustic signal.In deep water,the interference patterns of the areas with dominant waterborne modes and only with bottom bounce modes are greatly different.This phenomenon is illustrated by simulation and explained by the distribution ofβ.The theory shows that in the convergence zone,βapproaches infinity,which leads to the larger slope of sound intensity;on the contrary,in the shadow zone,βis close to 1,leading to smaller slopes.展开更多
In a realistic application of matched field processing for source localization,the ability to localize an acoustic source is strongly affected by the uncertainty of the environment.However,accurate environment measure...In a realistic application of matched field processing for source localization,the ability to localize an acoustic source is strongly affected by the uncertainty of the environment.However,accurate environment measurement is a difficult task in large regions of the ocean.We employ a Bayesian approach,referred to here as focalization,to overcome the mismatch by including the environment in the parameter search space.Focalization maximizes the posterior probability density over the unknown source and environmental parameters.The broadband signals recorded by a vertical line array in a Yellow Sea experiment are presented to demonstrate the feasibility of focalization.展开更多
以"Web of Science核心合集"的2759篇文献为数据源,应用科学计量工具CiteSpace绘制了中国基性岩研究的知识图谱,对该研究领域的发文特征、研究力量、知识基础、研究热点、趋势等进行了可视化分析。研究发现,中国基性岩研究可...以"Web of Science核心合集"的2759篇文献为数据源,应用科学计量工具CiteSpace绘制了中国基性岩研究的知识图谱,对该研究领域的发文特征、研究力量、知识基础、研究热点、趋势等进行了可视化分析。研究发现,中国基性岩研究可以概括为岩石类型、大地构造环境和研究区域特征三类方向,目前研究的热点包括:华北克拉通(North China Craton)、大火成岩省(large igneous province)、大陆地壳(continental crust)、中亚造山带(Central Asian Orogenic Belt)、构造演化(tectonic evolution)、岩石成因(petrogenesis)等,并且中国的研究机构已经形成了数个国际上成果突出的作者群,在该研究领域的发文量和影响力都处于领先,但是国际合作还需进一步加强。展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10974218 and 10734100and the Knowledge Innovation Program of Chinese Academy of Sciences(KZCX1-YW-12-2).
文摘The waveguide invariant,denoted asβ,can be used to describe the slope of the intensity of a broadband acoustic signal.In deep water,the interference patterns of the areas with dominant waterborne modes and only with bottom bounce modes are greatly different.This phenomenon is illustrated by simulation and explained by the distribution ofβ.The theory shows that in the convergence zone,βapproaches infinity,which leads to the larger slope of sound intensity;on the contrary,in the shadow zone,βis close to 1,leading to smaller slopes.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10974218 and 10734100the Knowledge Innovation Program of Chinese Academy of Sciences(KZCX1-YW-12-2)。
文摘In a realistic application of matched field processing for source localization,the ability to localize an acoustic source is strongly affected by the uncertainty of the environment.However,accurate environment measurement is a difficult task in large regions of the ocean.We employ a Bayesian approach,referred to here as focalization,to overcome the mismatch by including the environment in the parameter search space.Focalization maximizes the posterior probability density over the unknown source and environmental parameters.The broadband signals recorded by a vertical line array in a Yellow Sea experiment are presented to demonstrate the feasibility of focalization.
文摘以"Web of Science核心合集"的2759篇文献为数据源,应用科学计量工具CiteSpace绘制了中国基性岩研究的知识图谱,对该研究领域的发文特征、研究力量、知识基础、研究热点、趋势等进行了可视化分析。研究发现,中国基性岩研究可以概括为岩石类型、大地构造环境和研究区域特征三类方向,目前研究的热点包括:华北克拉通(North China Craton)、大火成岩省(large igneous province)、大陆地壳(continental crust)、中亚造山带(Central Asian Orogenic Belt)、构造演化(tectonic evolution)、岩石成因(petrogenesis)等,并且中国的研究机构已经形成了数个国际上成果突出的作者群,在该研究领域的发文量和影响力都处于领先,但是国际合作还需进一步加强。
