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基于分形径向谱的位场向下延拓截止波数自动确定方法

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地球物理学进展 2024年第1期39卷 403-411页

作者：曾小牛刘天佑谭笑枫张云李夕海火箭军工程大学核工程学院西安710025 海洋油气勘探国家工程研究中心北京100028

向下延拓是重磁位场数据处理与解释的一项重要技术,并因其固有的不稳定性而成为研究的热点.为获得稳定向下延拓结果,波数域向下延拓一般通过附加低通滤波器或改造向下延拓因子来完成.由此,滤波器或改造因子的截止波数则是精确向下延拓... 详细信息

向下延拓是重磁位场数据处理与解释的一项重要技术,并因其固有的不稳定性而成为研究的热点.为获得稳定向下延拓结果,波数域向下延拓一般通过附加低通滤波器或改造向下延拓因子来完成.由此,滤波器或改造因子的截止波数则是精确向下延拓的关键.本文基于分形修正径向平均功率谱的物理特性,提出一种位场向下延拓截止波数的自动确定方法.基于理论重力模型和航磁实测数据的向下延拓对比实验结果表明:(1)本文所提出的自动确定方法物理意义明确,能快速有效地确定截止波数并进而获得向下延拓正则参数;(2)基于本文方法的正则化向下延拓结果优于改进导数迭代法的向下延拓结果.

关键词：位场向下延拓径向平均功率谱截止波数分形

超声引导下置管引流联合腹腔镜阑尾切除术在化脓性阑尾炎中的应用效果

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临床医学研究与实践 2024年第18期9卷 45-48页

作者：刘天友贺克平杨林淮安市第二人民医院/徐州医科大学附属淮安医院超声医学科江苏淮安223002 淮安市第五人民医院超声科江苏淮安223300 淮安市第二人民医院/徐州医科大学附属淮安医院胃肠外科江苏淮安223002

目的探讨超声引导下置管引流联合腹腔镜阑尾切除术(LA)在化脓性阑尾炎中的应用价值。方法回顾性分析2019年1月至2023年7月徐州医科大学附属淮安医院收治的37例化脓性阑尾炎患者的临床资料,均先行超声引导下置管引流,待脓腔消失、急性炎... 详细信息

目的探讨超声引导下置管引流联合腹腔镜阑尾切除术(LA)在化脓性阑尾炎中的应用价值。方法回顾性分析2019年1月至2023年7月徐州医科大学附属淮安医院收治的37例化脓性阑尾炎患者的临床资料,均先行超声引导下置管引流,待脓腔消失、急性炎症缓解后行LA。结果37例患者均成功行超声引导下置管引流术,脓腔消失时间(2.95±0.82)d,腹痛消失时间(5.30±0.52)d,体温恢复至正常时间(4.25±1.20)d,白细胞计数恢复至正常时间(7.24±0.43)d,带管时间(7.27±0.96)d,带管期间总引流量(96.76±21.06)mL,LA手术时间(45.54±6.10)min,出血量(23.68±6.66)mL。3例患者因阑尾周围粘连严重而中转为开腹手术,所有患者未出现大出血、肠道损伤等严重并发症。结论超声引导下置管引流联合LA治疗化脓性阑尾炎具有创伤小、安全系数高、并发症少等优点,值得临床推广应用。

关键词：化脓性阑尾炎超声引导下置管引流腹腔镜阑尾切除术

Contribution to the Investigation of Structure and Origin of the East African Graben by Gravi metry

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Geo-Spatial Information Science 2005年第4期8卷 291-296页

作者： Tondozi Keto liu tianyou Faculty of Geophysics China University of Geosciences 1 Lumo Road Wuhan 430074 China 不详

For our investigation we have 235 measurements done in the east part of Democratic Republic of Congo by *** during a magnetic survey including the graben region from the parallel joining Goma city and Mahagi city, the region between Albert and Aka lakes, and the route from Aba to Kinsagani. During the surveys the density of recording points has been selected according to the importance of anomalies. In this way, the offset was 1 km where the disturbance was high in Goma city and 20 km have been sufficient along the route from Aba to Kinsagani. For the topographic and isostatic reductions only one cartographic document has been chosen that was the international map of the scale 1/1 000 000 which presents a certain characteristic of homogeneity.

关键词：东非国家重力测量重力异常测量方法

HUNK inhibits cargo uptake and lysosomal traffic in the caveolar pathway via the AGAP3/ARF6

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Science Bulletin 2024年第2期69卷 173-178页

作者： Siyuan Jiang Xiaoqi Han Tihui liu Ying He Zidong Zhao Tongfeng liu Shuwen Cheng Jihang Zhang Liqiang Duan Yajuan liu tianyou Cheng Yong liu Qinong Ye Shan Gao Zhongda Hospital Medical SchoolAdvanced Institute for Life and HealthSoutheast UniversityNanjing 20096China Medical School of Guizhou University Guiyang 550025China Shanxi Academy of Advanced Research and Innovation Taiyuan 030032China Zhongda Hospital School of Life Sciences and TechnologyAdvanced Institute for Life and HealthSoutheast UniversityNanjing 210096China Nanjing University Medical School Nanjing 210046China Hubei Key Laboratory of Cell Homeostasis College of Life SciencesTaiKang Center for Life and Medical SciencesWuhan UniversityWuhan 430072China Department of Medical Molecular Biology Beijing Institute of BiotechnologyCollaborative Innovation Center for Cancer MedicineBeijing 100850China

Endocytosis is a crucial cellular process that takes up cargos by enclosing them in membrane-bound vesicles,and transports cargos to different parts of the cell,such as the lysosomes[1].Endocytosis is classified into several mechanistically and morphologically pathways,including clathrin-mediated endocytosis(CME)and caveolae-mediated endocytosis(CavME)[1,2].

关键词： endocytosis cargo uptake

Review of production status of heavysteel castings and key technologies for their manufacture in China

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China Foundry 2008年第1期5卷 1-6页

作者： Kang Jinwu Huang tianyou liu Baicheng Key Laboratory for Advanced Materials Processing Technology Ministry of Education R R. China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

This paper expatiates on domestic status of heavy steel casting production, with a special focus on hydraulicturbine castings for Three Gorges Project. In China, there is magnificent demand for heavy castings with the rapidgrowth of the national economy in recent years and the expected high growth in the coming 10 to 20 years. Someheavy and large castings such as mill housing and hydraulic turbine runner crown, blade and band for Three GorgesProject have been successfully made. However, the domestic production capability is still far from meeting the giganticrequirements. The domestic capability still lags behind the world class level, and a lot of heavy castings still dependon import. The paper also gives a particular introduction of the key technologies in the manufacturing of heavy steelcastings like metal melting, foundry technology, heat treatment technology and numerical simulation technique, *** addition, several case studies on the application of numerical simulation in the production of heavy steel castingsare presented.

关键词：重型钢件铸造数值模拟铸造技术中国

Recent advances in two-dimensional photovoltaic devices

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Journal of Semiconductors 2024年第5期45卷 26-40页

作者： Haoyun Wang Xingyu Song Zexin Li Dongyan Li Xiang Xu Yunxin Chen Pengbin liu Xing Zhou tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518057China Optics Valley Laboratory Wuhan 430074China

Two-dimensional(2D)materials have attracted tremendous interest in view of the outstanding optoelectronic properties,showing new possibilities for future photovoltaic devices toward high performance,high specific power and *** recent years,substantial works have focused on 2D photovoltaic devices,and great progress has been ***,we present the review of recent advances in 2D photovoltaic devices,focusing on 2D-material-based Schottky junctions,homojunctions,2D−2D heterojunctions,2D−3D heterojunctions,and bulk photovoltaic effect ***,advanced strategies for improving the photovoltaic performances are demonstrated in ***,conclusions and outlooks are delivered,providing a guideline for the further development of 2D photovoltaic devices.

关键词： two-dimensional materials photovoltaic devices photodetectors solar cells heterostructures

Denoising of seismic data via multi-scale ridgelet transform

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Earthquake Science 2009年第5期22卷 493-498页

作者： Henglei Zhang tianyou liu Yuncui Zhang Institute of Geophysics and Geomatics China University of Geosciences Wuhan 430074 China Key Laboratory of Tectonics andPetroleum Resources (China University of Geosciences) Ministry of Education Wuhan 430074 China The 5th Geophysical Prospecting Brigade Zhongnan Petroleum Bureau Xiangtan 411104 China

Noise has traditionally been suppressed or eliminated in seismic data sets by the use of Fourier filters and, to a lesser degree, nonlinear statistical filters. Although these methods are quite useful under specific conditions, they may produce undesirable effects for the low signal to noise ratio data. In this paper, a new method, multi-scale ridgelet transform, is used in the light of the theory of ridgelet transform. We employ wavelet transform to do sub-band decomposition for the signals and then use non-linear thresholding in ridgelet domain for every block. In other words, it is based on the idea of partition, at sufficiently fine scale, a curving singularity looks straight, and so ridgelet transform can work well in such cases. Applications on both synthetic data and actual seismic data from Sichuan basin, South China, show that the new method eliminates the noise portion of the signal more efficiently and retains a greater amount of geologic data than other methods, the quality and consecutiveness of seismic event are improved obviously as well as the quality of section is improved.

关键词： ridgelet transform multi-scale random noise sub-band decomposition complex Morlet wavelet

Interpretation of the west segment of the coastal fault zone in the coastal region of South China based on the gravity data

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Geodesy and Geodynamics 2018年第2期9卷 142-150页

作者： Lisi Bi Zhenhuan Ren Xiuwei Ye tianyou liu Jihua Qiao Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Administration Guangdong Provincial Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Projects China University of Geosciences Development Research Center of China Geological Survey

By systemic processing, comprehensive analysis, and interpretation of gravity data, we confirmed the existence of the west segment of the coastal fault zone(west of Yangjiang to Beibu Bay) in the coastal region of South China. This showed an apparent high gravity gradient in the NEE direction, and worse linearity and less compactness than that in the Pearl River month. This also revealed a relatively large curvature and a complicated gravity structure. In the finding images processed by the gravity data system, each fault was well reflected and primarily characterized by isolines or thick black stripes with a cutting depth greater than 30 km. Though mutually cut by NW-trending and NE-trending faults, the apparent NEE stripe-shaped structure of the west segment of the coastal fault zone remained unchanged,with good continuity and an activity strength higher than that of NW and NE-trending faults. Moreover,we determined that the west segment of the coastal fault zone is the major seismogenic structure responsible for strong earthquakes in the coastal region in the border area of Guangdong, Guangxi, and Hainan.

关键词： Coastal region of South China West segment of the coastal fault zone Gravity data Seismogenic structure

Geophysical Characteristics of Songliao,Bohaiwan and Jianghan Basins,East China

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Journal of Earth Science 1997年第1期16卷 21-24页

作者： liu tianyou Shi XuemingDepartment of Geophysics, China University of Geosciences, Wuhan 430074

ongliao, Bohaiwan and Jianghan basins are typical rift basins in East China, whose geophysical characteristics are described as follows: (1) The trends of the regional gravity and magnetic field are dominantly NNE, which indicates that the fault network of the basement is NNE and NE. (2) The deep gravity anomalies are mirror reflection of the depression areas associating with high heat flow, which can be explained by the uplift of Moho surface in these basins. (3) The crust has twolayer structure consisting of granite and basalt rocks, and there exist highconductivity and lowvelocity layers in the crust and in the upper mantle. (4) The oil and gas enrichments are distinctly related to the degree of the asthenosphere upwelling and crust thinning and high heat flow.

关键词： geophysical characteristics riftdepression basin East China.