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海南城市更新项目的设计特色与传播效能研究

鞋类工艺与设计 2024年第15期4卷 139-141页

作者：徐纪枫海口经济学院海南海口571132

城市更新背景下,我国海南省展现出巨大城市发展潜力,体现出多元城市更新设计特色,具有极佳研究价值。本文基于城市更新视角,深层剖析现代城市更新理念,细分城市更新发展阶段,基于此,将目光聚焦于我国海南省,分析我国海南城市更新项目设... 详细信息

城市更新背景下,我国海南省展现出巨大城市发展潜力,体现出多元城市更新设计特色,具有极佳研究价值。本文基于城市更新视角,深层剖析现代城市更新理念,细分城市更新发展阶段,基于此,将目光聚焦于我国海南省,分析我国海南城市更新项目设计特色,即弹性建设、支撑夯实和生态规划,明确海南城市更新传播效能。

关键词：海南发展城市更新项目设计设计特色传播效能

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海南自贸港对外传播效能及城市形象设计

鞋类工艺与设计 2024年第14期4卷 37-39页

作者：徐纪枫海口经济学院海南海口571132

近些年,我国开放程度持续提升,国内外的互动逐步深入,迫切需要促进中外有效沟通,传播中国城市形象。海南自贸港也需顺应对外开放发展格局,加强城市形象设计,探索切实可行的对外传播路径,不断提升对外传播效能。基于此,本文对海南自贸港... 详细信息

近些年,我国开放程度持续提升,国内外的互动逐步深入,迫切需要促进中外有效沟通,传播中国城市形象。海南自贸港也需顺应对外开放发展格局,加强城市形象设计,探索切实可行的对外传播路径,不断提升对外传播效能。基于此,本文对海南自贸港对外传播面临的困境进行探讨,提出海南自贸港城市形象设计及对外传播效能提升的路径,以供参考。

关键词：海南自贸港城市形象设计对外传播效能提升路径

Dupal Anomaly and Identification using Nd-Hf Isotopes

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 416-429页

作者： TIAN Ye xu jifeng LIU Xijun School of Earth Science and Resources and State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijing 100083China Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration College of Earth SciencesGuilin University of TechnologyGuilinGuangxi 541004China

The Dupal anomaly has attracted widespread attention since being discovered and is regarded as the most direct manifestation of mantle inhomogeneity at present. From the initially defined anomalies limited to the southern hemisphere to the global scale, the criteria for identifying anomalies defined by Pb isotopes have also been adjusted, providing an important method and reference for the study of the mantle evolution. Pearce and Peate(1995) proposed the method of NdHf isotope and element ratio to identify the Dupal anomaly. The Nd-Hf method also offers a possible way to discriminate the mantle region of arc magmatism through the correction of Nd in the subduction process. This paper introduces the concepts and determination methods of the Dupal anomaly, and reports new Hf isotopic data of MORB-type rocks with Dupal signature in the several Tethys ophiolites. Our results of Nd-Hf method are in good agreement with those of previous Pb isotope identification. Moreover, origins and their controversy of Dupal anomaly are reviewed, and possible internal connections between Dupal anomalies and the two Large Low Shear Velocity Provinces(LLSVPs) in the lower mantle are discussed in depth. Further studies on origin and evolution of the Dupal anomaly are suggested, especially using integrated approach of Hf-Nd and Pb isotopes.

关键词： Dupal anomaly LLSVPs Pb isotope Nd-Hf isotope mantle heterogeneity

Origin of the DUPAL anomaly in the Tethyan mantle domain and its geodynamic significance

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Science China Earth Sciences 2023年第12期66卷 2712-2727页

作者： Xijun LIU jifeng xu Wenjiao XIAO Pengde LIU Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration&Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi College of Earth SciencesGuilin University of TechnologyGuilin 541004China School of Earth Sciences and Resources China University of GeosciencesBejing 100083China National Key Laboratory of Arid Area Ecological Security and Sustainable Development State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 83001lChina

Mantle heterogeneity has revealed systematic differences in Pb isotopic compositions between the Indian OceanSouth Atlantic mantle in the Southern Hemisphere and the Pacific Ocean-North Atlantic mantle in the Northern *** large-scale difference in mantle isotopes in the Southern Hemisphere is known as the DUPAL anomaly,but its origin remains *** on a systematic review of the Nd-Pb isotopic evolution of the Tethyan mantle domain,this study identified the long-term presence of the DUPAL anomaly in this domain since the early Paleozoic,characterized by long-term and high mantle thorium/uranium(Th/U)*** comparing the Nd-Pb isotopic compositions of the Tethyan mantle domain with the Panthalassic-Pacific mantle domain(the Paleo-Asian,Paleo-Pacific,and modern Pacific oceans),it is shown that the mantle initially had low Th/U features due to early Earth crust-mantle differentiation,with the crust having high Th/U *** such,the mantle initially had uniformly low Th/U ratios that were inherited throughout the Panthalassic-Pacific mantle ***,the plate tectonics and continental collisions in the Tethyan domain affected its characteristics,leading to the long-term and large-scale DUPAL *** the opening of and subduction in the Tethys Ocean,Gondwanaland fragmentation and frequent continent-continent collisions led to long-term and extensive crust-mantle interactions and the continuous input of highTh/U mantle sources,which thus modified the *** process formed not only the unique DUPAL anomaly in the Tethyan mantle domain,but also the Tethyan tectonic domain dominated by continental ***,the high DUPAL anomaly in the Proto-and Paleo-Tethyan mantle domains records the effects of mantle plumes,which might have occurred primarily during the formation of the Proto-and Paleo-Tethys oceans during the early evolution of the Tethyan ***,the inherent coupling of mantle domain properties and plat

关键词： Tethyan domain DUPAL anomaly Large low-shear-velocity provinces(LLSVPs) Ophiolite Geodynamics

湿热环境对T800S/M21碳纤维复合材料基体主导力学性能的影响研究

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复合材料科学与工程 2024年第5期 100-106页

作者：陈程李晨王岩高丽敏徐吉峰中国商飞北京民用飞机技术研究中心民用飞机结构与复合材料北京市重点实验室北京102200

以T800S/M21碳纤维复合材料为研究对象,在三种吸湿调控与两种试验温度的湿热环境组合下,开展90°拉伸、±45°拉伸以及Ⅰ型与Ⅱ型层间断裂等基体主导力学性能影响试验。研究了湿热环境对基体拉伸及面内剪切模量与强度的影响,获得了湿热... 详细信息

以T800S/M21碳纤维复合材料为研究对象,在三种吸湿调控与两种试验温度的湿热环境组合下,开展90°拉伸、±45°拉伸以及Ⅰ型与Ⅱ型层间断裂等基体主导力学性能影响试验。研究了湿热环境对基体拉伸及面内剪切模量与强度的影响,获得了湿热环境对层间性能G_(Ⅰc)与G_(Ⅱc)的影响。基于±45°拉伸与裂纹观察试验,获得了剪切刚度退化与厚度面裂纹数量演化规律,并分析了吸湿调控对引起剪切刚度退化的损伤机理影响。结果表明:湿热环境对T800S/M21复合材料基体主导的拉伸与剪切性能产生显著的折减影响,也对层间性能产生退化影响。湿热环境对面内剪切非线性特征产生一定弱化影响,吸湿加速了宏观裂纹产生与剪切刚度退化进程,导致宏观裂纹产生了比微观裂纹更加显著的刚度折减贡献。

关键词：碳纤维复合材料面内剪切性能湿热环境损伤机理

Nonlocal thermo-elastic constitutive relation of fibre-reinforced composites

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Acta Mechanica Sinica 2020年第1期36卷 176-187页

作者： Linjuan Wang jifeng xu Jianxiang Wang Bhushan LKarihaloo State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing100871China CAPT-HEDPS and IFSA Collaborative Innovation Center of MoECollege of EngineeringPeking UniversityBeijing100871China Beijing Aeronautical Science and Technology Research Institute Beijing100083China School of Engineering Cardiff UniversityCardiffCF243AAUK

The effective properties of composite materials have been predicted by various micromechanical *** composite materials of constituents which are described by the classical governing equations of the local form,the conventional micromechanical schemes usually give effective properties of the local ***,it is recognized that under general loading conditions,spatiotemporal nonlocal constitutive equations may better depict the macroscopic behavior of these *** this paper,we derive the thermo-elastic dynamic effective governing equations of a fibre-reinforced composite in a coupled spatiotemporal integral *** coupled equations reduce to the spatial nonlocal peridynamic formulation when the microstructural inertial effects are *** static deformation and steady-state heat conduction,we show that the integral formulation is superior at capturing the variations of the average displacement and temperature in regions of high gradients than the conventional micromechanical *** approach can be applied to analogous multi-field coupled problems of composites.

关键词： Nonlocal theory Thermoelasticity Composite materials Constitutive equations

针栓结构参数对液氧/甲烷发动机跨临界燃烧效率的影响

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航空动力学报 2024年第9期39卷 416-427页

作者：谭天军张斌李志强向纪鑫徐吉峰任和郑晓霞太原理工大学机械与运载工程学院太原030024 中国人民解放军空军装备部太原军事代表处太原030000 太原理工大学航空航天学院太原030600 中国商用飞机有限责任公司北京民用飞机技术研究中心北京102211 中国商用飞机有限责任公司营销中心上海200126

为了研究跨临界燃烧下针栓结构参数对燃烧效率的影响,采用标准k-ε湍流模型、非绝热稳态扩散火焰面模型,同时考虑流体真实物性,对液氧/甲烷针栓式发动机跨临界燃烧进行数值研究。分析不同物性计算方法对推力室内流场影响,并分析针栓喷... 详细信息

为了研究跨临界燃烧下针栓结构参数对燃烧效率的影响,采用标准k-ε湍流模型、非绝热稳态扩散火焰面模型,同时考虑流体真实物性,对液氧/甲烷针栓式发动机跨临界燃烧进行数值研究。分析不同物性计算方法对推力室内流场影响,并分析针栓喷注器径向环缝宽度、轴向环缝宽度对发动机燃烧效率的影响。结果表明:考虑跨临界效应时,形成的中心回流区和高温区域均较小。在一定范围内,径向环缝增大,燃烧效率先减小后增大,轴向环缝宽度增大,燃烧效率降低,轴向环缝宽度取较小值而径向环缝宽度取较大值时,可获得较高的燃烧效率。动量比小于1时,增大轴向动量可有效改善混合;动量比大于1时,增大轴向动量对改善混合的作用减弱。燃烧效率随动量比增大而降低,当不同工况的动量比值接近时,总动量较大工况的燃烧效率更高。

关键词：液氧/甲烷火箭发动机针栓式喷注器跨临界燃烧结构参数燃烧效率

低温等离子技术在耳内镜鼓膜修补术中的应用效果

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中华耳科学杂志 2024年第4期22卷 603-607页

作者：王浩赵泽祺徐继峰丁锐肖朝球李巍徐州医科大学第一临床医学院徐州221000 徐州医科大学附属医院耳鼻咽喉头颈外科

目的探讨低温等离子技术在耳内镜鼓膜修补术中的应用效果。方法选取2021年7月至2022年2月在徐州医科大学附属医院耳鼻咽喉头颈外科行耳内镜鼓膜修补术的慢性化脓性中耳炎患者60例,按照随机数表法分为观察组和对照组,每组30例。观察组采... 详细信息

目的探讨低温等离子技术在耳内镜鼓膜修补术中的应用效果。方法选取2021年7月至2022年2月在徐州医科大学附属医院耳鼻咽喉头颈外科行耳内镜鼓膜修补术的慢性化脓性中耳炎患者60例,按照随机数表法分为观察组和对照组,每组30例。观察组采用低温等离子刀行耳道内切口,对照组采用耳道皮瓣刀行耳道内切口,比较两组患者术中及术后情况。结果观察组手术时间短于对照组,差异有统计学意义(P0.05)。术后2个月,观察组和对照组气导听阈平均值及气骨导差值均显著低于术前,差异有统计学意义(P0.05)。结论在耳内镜鼓膜修补术中应用低温等离子技术能及时止血,维持清晰的术野,缩短了手术时间,适合在耳内镜鼓膜修补手术中推广应用。

关键词：耳内镜鼓膜修补术低温等离子

Geochemistry of the Eocene Felsic Porphyric Rocks and High-Mg Potassic Rocks along JARSZ:Implication for the Tectonic Evolution in Eastern Tibet

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Acta Geologica Sinica(English Edition) 2010年第6期84卷 1448-1460页

作者： CHEN Jianlin xu jifeng WANG Baodi KANG Zhiqiang Key Laboratory oflsotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Chengdu Institute of Geology and Mineral Resources Chengdu 610081 China Guilin University of Technology Guilin 541004 China

Eocene felsic porphyric rocks and the high-Mg potassic volcanic rocks（HMPR） occur along the Jinshajiang-Ailao Shan-Red River shear zone（JARSZ） in eastern *** with the HMPR,which are generally believed to be sourced from an enriched mantle,the felsic porphyric rocks show similar K_2O contents,enrichment in LREE and LILE,particularly radiogenic isotope（*** and Nd） features much similar to the former,implying generation of the felsic porphyric rocks most likely related to the HMPR,although they both have clearly different major and trace element compositions. The close relationship in spatial-temporal distribution and similar Sr-Nd characteristics between the felsic porphyric rocks and HMPR in eastern Tibet indicate that both of them were possibly formed by a similar tectonic process（event）.Combining the basic dikes in southern and eastern Tibet,we suggest that the break-off of north-dipping Neo-Tethyan slab in southern Tibet during 50-40 Ma,triggered formation of high-Mg potassic *** led to developing felsic porphyric magma production by partial melting of underplating HMPR in the lower crust,or fractionation crystallization of the high-Mg potassic *** break-off of slab in the Eocene may also have contributed to the abundant ore-forming material related to earlier subduction events,resulting in formation of the porphyric deposits along JARSZ in eastern Tibet.

关键词： Eocene felsic porphyric rocks HMPR break-off eastern Tibet