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Characteristics of gravity anomalies and tectonic analysis of Enderby Land in East Antarctica and its adjacent areas

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Acta Oceanologica Sinica 2023年第2期42卷 94-103页

作者： Long Ma Chenguang Liu An Yang Baohua Liu chenglong xia First Institute of Oceanography Ministry of Natural ResourcesQingdao266061China Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao266071China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China National Deep Sea Center Ministry of Natural ResourcesQingdao266237China Naval Research Institute Tianjin300061China

Enderby Land in East Antarctica and its adjacent areas,which are closely related to the Indian Plate in their geological evolution,have become one of the key zones for studies on how the Antarctic continent *** on the isostasy and flexure theories of the lithosphere and using the CRUST1.0 model as the depth constraint,this paper uses the gravity field model EIGEN-6C4 and topographic data to calculate the isostatic gravity anomalies of Enderby Land and its adjacent ***,the crustal thickness of the study area is calculated,and three comprehensive geophysical interpretation profiles that vertically span the study area are *** results show that the flexural isostatic gravity anomalies in Enderby Land and its adjacent areas are closely related to the regional tectonic setting,and the anomalies in different regions differ substantially,ranging from−50×10^(−5)m/s^(2)to 85×10^(−5)m/s^(2).A zone of high isostatic gravity anomalies(30×10^(−5)−80×10^(−5)m/s^(2))is distributed outside the Cooperation Sea and Queen Maud Land,which may be plate remnants generated by early *** for the Kerguelen Plateau,which was formed by a hotspot and has a crustal thickness of 15 km,the thickness of the oceanic crust in other parts of the study area changes slightly by approximately 4–9 km,with the thinnest part being in Enderby *** thickness of the inland crust along the coastline increases with the elevation,with the maximum thickness reaching 34 *** isostatic gravity anomalies corresponding to the zone of high magnetic anomalies along the continental margin of Queen Maud Land are negative and small,with an isostatic adjustment trend indicating Moho surface uplift,and those on the edge of central Enderby Land are near zero,approaching the isostatic state,which may be caused by the magmatism at the early stage of *** continental-oceanic boundary should be close to the contour line of the crustal thickness 10–12 km on the outer edge of the coa

关键词： Enderby Land and its adjacent areas flexural isostatic gravity anomalies crustal structure isostatic adjustment

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Acoustofluidic scanning fluorescence nanoscopy with a large field of view

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Microsystems & Nanoengineering 2024年第3期10卷 159-167页

作者： Geonsoo Jin Neil Upreti Joseph Rich Jianping xia chenglong Zhao Tony Jun Huang Thomas Lord Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA Department of Biomedical Engineering Duke UniversityDurhamNC 27708USA The MITRE Corporation McLeanVA 22102USA

Large-field nanoscale fluorescence imaging is invaluable for many applications,such as imaging subcellular structures,visualizing protein interactions,and high-resolution tissue ***,conventional fluorescence microscopy requires a trade-off between resolution and field of view due to the nature of the optics used to form the *** overcome this barrier,we developed an acoustofluidic scanning fluorescence nanoscope that simultaneously achieves superior resolution,a large field of view,and strong fluorescent *** acoustofluidic scanning fluorescence nanoscope utilizes the superresolution capabilities of microspheres that are controlled by a programmable acoustofluidic device for rapid fluorescence enhancement and *** acoustofluidic scanning fluorescence nanoscope resolves structures that cannot be resolved with conventional fluorescence microscopes with the same objective lens and enhances the fluorescent signal by a factor of~5 without altering the field of view of the *** improved resolution realized with enhanced fluorescent signals and the large field of view achieved via acoustofluidic scanning fluorescence nanoscopy provides a powerful tool for versatile nanoscale fluorescence imaging for researchers in the fields of medicine,biology,biophysics,and biomedical engineering.

关键词： field resolution utilize

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Ultrastructural analysis of neuronal synapses using state-of-the-art nano-imaging techniques

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Neuroscience Bulletin 2012年第4期28卷 321-332页

作者： Changlu Tao chenglong xia xiaobing Chen Z. Hong Zhou Guoqiang Bi Center for Integrative Imaging Hefei National Laboratory for Physical Sciences at the Microscale & School of LifeSciences University of Science and Technology of China Hefei 230027 China Laboratory of Neurobiology National Institute of Neurological Disorders and Stroke National Institutes of HealthBethesda 20892 USA Department of Microbiology Immunology & Molecular Genetics University of California Los Angeles Los Angeles CA90095-7364 USA

Neuronal synapses are functional nodes in neural *** organization and activity define an individual＇s level of intelligence,emotional state and mental *** in the structure and efficacy of synapses are the biological basis of learning and ***,investigation of the molecular architecture of synapses has been impeded by the lack of efficient techniques with sufficient *** developments in state-of-the-art nano-imaging techniques have opened up a new window for dissecting the molecular organization of neuronal synapses with unprecedented ***,we review recent technological advances in nano-imaging techniques as well as their applications to the study of synapses,emphasizing super-resolution light microscopy and 3-dimensional electron tomography.

关键词： synaptic architecture nano-imaging super-resolution imaging STED microscopy STORM PALM cryoET

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Tectonic implications of the subduction of the Kyushu-Palau Ridge beneath the Kyushu,southwest Japan

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Acta Oceanologica Sinica 2021年第3期40卷 70-83页

作者： chenglong xia Yanpeng Zheng Baohua Liu Qingfeng Hua Long Ma xianfeng Li Qiuhong Xie College of Marine Geosciences Ocean University of ChinaQingdao 266100China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China National Deep Sea Center Qingdao 266237China Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China

The Kyushu-Palau Ridge(KPR),a remnant arc on the Philippine Sea Plate(PSP),is subducting beneath the Kyushu,southwest *** by the subducting KPR,the Kyushu subduction zone corresponding to the KPR is significantly different from Shikoku subduction zone in terms of gravity anomalies,seismicity,the stress state,and the subducting slab *** negative free-air and Bouguer gravity anomalies are observed in a prolonged area of KPR,southeast of the Miyazaki Plain,indicating that this is where KPR overlaps the overriding *** gravity anomaly in this area is much lower than that in other areas where the inferred KPR extends,suggesting that the subduction of the buoyant KPR may cause the lower mantle density to *** earthquakes have occurred in Hyuga-nada region where the KPR subducts than in Shikoku forearc and other areas in the Kyushu forearc,indicating that the subduction of the KPR enhances the local coupling between the subducting and overriding *** centroid moment tensor(CMT)mechanism of earthquakes shows that stress is concentrated in the accumulated crust beneath the Kyushu forearc corresponding to the KPR,and the shallow thrusting events in the obducting plate are caused by the KPR *** buoyant KPR,with a large volume of low-density sediments,was responsible for the differences of the subduction depth and dip angle of the subducting Philippine Sea(PS)slab between northern Kyushu and *** seismic gaps and the sudden change of the dipping angle of the subducting PS slab indicate that slab tear may have occurred along the west side of the KPR beneath southwest Kyushu.A two-tear model was proposed,and the subduction of the buoyant KPR was believed to play an important role in the slab tear.

关键词： Kyushu-Palau Ridge gravity anomaly seismicity slab morphology slab tear

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Double random number encryption blind watermarking technique based on DWT-DCT domain

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Optoelectronics Letters 2024年第10期 614-622页

作者： WANG chenglong MA Yi WANG xia National Engineering Research Center for Technology and Equipment of Environmental Deposition Lanzhou Jiaotong University Key Laboratory of Opto-Technology and Intelligent Control Ministry of Education Lanzhou Jiaotong University

Blind watermarking plays a significant role in copyright protection and information hiding. To enhance the security of watermark image information, a dual encryption method is proposed, which combines block shuffling with Logistic chaos encryption using two sets of random numbers as keys. This dual encryption technique is applied to blind watermark images, utilizing a combination of discrete wavelet transform(DWT) and discrete cosine transform(DCT) as the embedding method. First, the watermark image is divided into small blocks, which are shuffled and rearranged using one set of random numbers as the key, while recording the shuffling sequence of block positions. Subsequently, the shuffled blocks are reassembled into an image, and another set of random numbers is used as the key for Logistic chaos encryption, rendering the watermark image chaotically invisible. Then, a double DWT is applied to the carrier image, followed by a DCT, allowing the encrypted watermark image to be embedded. This achieves the concealment of the blind watermark. Experimental results demonstrate that this method exhibits robustness, excellent invisibility, and secrecy.

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“体育促进发展”理念及其实践对我国新时代体育强国建设的启示

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北京体育大学学报 2022年第2期45卷 52-63页

作者：夏成龙熊欢华南师范大学体育科学学院广东广州510631 云南大学体育学院云南昆明650000 上海体育学院上海200438

“体育促进发展”(SFD)是近年来国际主流社会密切关注并大力推行的理念和体育实践,将体育作为一种“催化剂”与其他非体育活动项目结合以实现社会整体的发展目标。运用文献资料、逻辑分析等方法,考察“SFD”理念提出的背景依据,剖析其... 详细信息

“体育促进发展”(SFD)是近年来国际主流社会密切关注并大力推行的理念和体育实践,将体育作为一种“催化剂”与其他非体育活动项目结合以实现社会整体的发展目标。运用文献资料、逻辑分析等方法,考察“SFD”理念提出的背景依据,剖析其理论内涵和实践框架,归纳“SFD”的研究议题与发展趋势。学界主要从教育、残疾、性别平等、生计、健康、社区发展、发展与和平7个议题展开了理论和实践应用的研究,关注儿童、青少年及残疾人等弱势群体的积极发展,通过体育和体育赛事促进社区的可持续发展,并为身体活动不足或高风险人群提供一个健康促进的发展平台,探索体育对提高企业的社会责任意识及其可持续发展的潜力,讨论体育活动对促进跨文化交流的影响,强调体育促进不同区域和国家的外交合作等方面发挥的积极作用。在此基础上,讨论“SFD”理念可为我国体育强国建设带来的启示,认为“SFD”理念为我国体育发展方式的转变提供了理论参照,为我国体育政策的制定和项目规划提供了基本依据,为推动体育国际话语理论体系建设及体育学术创新提供理论素材。

关键词：社会发展体育改革体育促进发展项目全球体育治理体育强国

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我国“体医融合”复合型人才培养研究

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中国公共卫生管理 2023年第5期39卷 643-645页

作者：夏成龙云南大学体育学院云南昆明650500 华南师范大学体育科学学院

新冠疫情期间,健身运动在健康促进和慢性病的预防与康复等方面发挥着积极的作用,“体医融合”的社会氛围也正在形成。在此背景下,呼吁高校弥合公共卫生与运动科学之间的教育裂痕,推动“体医融合”复合型人才培养尤为必要。采用文献资料... 详细信息

新冠疫情期间,健身运动在健康促进和慢性病的预防与康复等方面发挥着积极的作用,“体医融合”的社会氛围也正在形成。在此背景下,呼吁高校弥合公共卫生与运动科学之间的教育裂痕,推动“体医融合”复合型人才培养尤为必要。采用文献资料、专家访谈和比较分析等研究方法,在对体育锻炼不足引发的公共健康危机进行梳理的基础上,从外部环境、运作平台和实施要素3个方面分析我国高等院校“体医融合”人才培养的现状和存在的障碍,在此基础上,从强化制度支持体系、完善体制机制和建立人才培养的理论模型与操作样式3个方面给出针对性的建议。

关键词：健康中国公共卫生运动科学体医融合人才培养

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单个铝颗粒及铝颗粒群点火燃烧研究进展

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固体火箭技术 2022年第6期45卷 929-941页

作者：张家瑞夏智勋马立坤冯运超王建宏夏成龙国防科技大学空天科学学院长沙410073 国防科技大学长沙410073 火箭军装备部驻长沙地区军事代表室长沙410073

以铝为代表的金属颗粒燃料具有燃烧热值高、存储稳定性好、产物无毒等优点,在军用和民用领域具有广阔的应用前景。从单个铝颗粒点火燃烧和铝颗粒群点火燃烧两方面综述相关领域的研究进展,梳理了单个铝颗粒燃烧的理论研究和数值模拟方法... 详细信息

以铝为代表的金属颗粒燃料具有燃烧热值高、存储稳定性好、产物无毒等优点,在军用和民用领域具有广阔的应用前景。从单个铝颗粒点火燃烧和铝颗粒群点火燃烧两方面综述相关领域的研究进展,梳理了单个铝颗粒燃烧的理论研究和数值模拟方法发展历程和发展动态。从实验研究、理论模型和数值模拟三方面重点介绍了铝颗粒群燃烧的研究现状,指出建立能兼顾计算精度和计算成本的铝颗粒点火燃烧子模型是提高含铝颗粒燃烧室优化设计的关键。论文第三部分介绍了基于化学建表的固体颗粒燃料燃烧数值模拟方法及该方法在铝颗粒燃烧中的最新应用。最后,指出铝颗粒群燃烧研究中亟待解决的问题。

关键词：铝颗粒储能载体气固两相流点火燃烧

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基于泰勒级数展开的低纬度磁异常化极方法研究

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海洋测绘 2023年第5期43卷 1-6页

作者：张连伟夏成龙郭灿文孙毅马永国家海洋信息中心天津300171 海军研究院天津300061

为有效解决低纬度地区磁异常资料化极处理过程中存在沿垂直于磁偏角方向放大、拉伸高频干扰等问题,进而提高磁资料解释的精度,在总结前人提出的低纬度磁异常化极方法原理的基础上,对化极转换因子进行改造,提出基于泰勒级数展开的低纬度... 详细信息

为有效解决低纬度地区磁异常资料化极处理过程中存在沿垂直于磁偏角方向放大、拉伸高频干扰等问题,进而提高磁资料解释的精度,在总结前人提出的低纬度磁异常化极方法原理的基础上,对化极转换因子进行改造,提出基于泰勒级数展开的低纬度化极法。经单模型、多模型正演数据验证和实测数据应用分析,该方法在低纬度区域化极结果准确、可靠、精度更高,有效消除磁异常沿垂直于磁偏角方向拉伸的现象。本文提出的方法明显改善了低纬度地区磁异常化极效果。

关键词：磁异常低纬度化极法频率域振幅谱泰勒级数

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基于深度强化学习的智能干扰方法研究

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电声技术 2022年第5期46卷 144-149页

作者：夏成龙李祥刘辰烨杨旸中国人民解放军陆军工程大学通信工程学院江苏南京210007

随着人工智能技术的发展,智能终端已经可以通过频谱感知、通信效果检测分析等方式智能地改变通信手段,进而实现高效率抗干扰,这给传统干扰带来了巨大挑战。而深度强化学习在复杂场景中的探索效率高,面对高难度任务的能力强大,在军事干... 详细信息

随着人工智能技术的发展,智能终端已经可以通过频谱感知、通信效果检测分析等方式智能地改变通信手段,进而实现高效率抗干扰,这给传统干扰带来了巨大挑战。而深度强化学习在复杂场景中的探索效率高,面对高难度任务的能力强大,在军事干扰领域应用前景广阔。基于此,介绍深度强化学习、智能干扰方法这两个基本问题的研究现状和存在的难点问题,总结并提出未来基于深度强化学习的智能干扰方法的研究前景和技术展望。

关键词：数字通信深度强化学习智能干扰决策

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