Results 11 to 20 of about 6,166 (164)
Research progress in microstructure and service performance of high-strength and corrosion-resistant ODS−FeCrAl alloy [PDF]
, 2022 The demand for cleaner and more efficient new generation reactors has become increasingly urgent to solve the world’s energy supply and environmental issues such as carbon emissions. The Fukushima nuclear power plant disaster in 2011 prompted researchers
Hao-dong JIA, Zhang-jian ZHOU
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Kongjian kexue xuebao, 2023 统计研究漠河、北京、武汉流星雷达观测到的2012－2018年80~100 km高度的风场数据，比较在地磁平静期（$ Kp\le 2 $）和地磁扰动期（$ Kp\ge 4 $）的日平均风场数据，得到在地磁活动期风场的变化特征。研究结果表明，在地磁扰动时风场变化具有季节差异和纬度差异。地磁扰动期间，纬向风在较高纬度地区倾向于中间层西风增强，低热层东风增强，纬度较低地区倾向于东风增强。春季，地磁活动对纬向风的影响没有纬度差异，在夏冬季随着纬度的降低中间层东风增强明显。地磁活动对经向风的影响具有季节差异 ...
刘 晋芳 +3 more
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Kongjian kexue xuebao, 2023 对2001－2021年SOHO卫星的极紫外辐射测量数据，以及CHAMP，GRACE-A和SWARM-C卫星资料推导出的高分辨率大气密度数据进行统计分析，发现大气密度与极紫外测量值的相关系数大于密度与F10.7指数的相关系数，证实极紫外辐射在不同地方时的影响程度存在显著差异，从而驱动大气密度的周日变化。利用三颗卫星的高度差异揭示极紫外辐射对大气密度的加热效应在350～500 km范围随着高度增加而减弱。统计得到极紫外辐射影响在地方时和纬度上的空间差异：对夏季半球的影响大于冬季半球；在白天 ...
汪 宏波, 张 明江, 熊 建宁
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Research status and progress of hydrogen embrittlement of hydrogen pipelines [PDF]
, 2023 Hydrogen transportation through pipelines has extremely high economic value in realizing the development of the hydrogen energy industry and promoting efficient energy utilization.
Hongliang MING, Jianqiu WANG, Jianwei DU
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Taxonomic and functional diversity of urban bees of the world
Conservation Biology, EarlyView.Abstract Bees play a pivotal role in terrestrial environments. Urbanization can affect these organisms and the ecosystem services they provide. However, knowledge of the global diversity of urban bees is limited. Thus, we summarized data on urban bee species identities and occurrences; compared distributions of all bees with those found in urban ...
João C. F. Cardoso +10 more
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基于GIS的干热河谷植被恢复分区研究——以攀枝花城市视野区为例
Shuitu Baochi Xuebao, 2003 以攀枝花视野区为例,研究了基于GIS的干热河谷区植被恢复适宜性评价及分区方法.在干热河谷植被恢复适宜性评价及分区中,主要考虑对植被类型及植物生长影响较大的海拔高度、坡向、坡度、岩土类型、土层厚度等因素,并采用专家评分法给各影响因子权重和适宜性评价赋值.经过GIS的数据处理、空间分析、模型建立及运算,得到植被恢复适应性评价图,再经过分类、合并,将攀枝花市视野区划分为适宜区、较适宜区、较不适宜区、不适宜区、极不适宜区,得到植被恢复分区图.
何锦峰, 杨忠, 冯明义, 张信宝
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Zhejiang Daxue xuebao. Lixue ban, 2014 热带印度洋是最强最稳定的江淮持续性暴雨中期海温信号区.在此基础上，利用28年气候逐候资料，根据该信号区海温与后期OLR(Outgoing Longwave Radiation)场和环流场的相关分析以及典型持续性暴雨过程的合成分析，初步探究了其对江淮持续性暴雨形成的中期影响机制.研究结果表明，前期信号区海温异常可通过以下3 种途径对江淮持续性暴雨过程的发生产生影响.过程发生前5候至前4候热带印度洋偏高的海温及其引起的热带对流异常，导致热带偏北印度洋至热带西太平洋上异常的准纬向环流形成 ...
LIUHuijun(刘会军) +1 more
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Laser interaction with materials and its applications in precision engineering [PDF]
, 2017 本文主要介绍了激光与物质的相互作用及其在精密工程中的应用.为了更深入地研究激光与物质的相互作用过程,在了解激光特点与原理的基础上,分析激光与物质; 相互作用的动态过程及其机理,通过对激光合成纳米材料的研究,探索激光加工的具体过程和特点并加以广泛应用.本文通过对4个应用实例的介绍,简述了激光在; 精密工程中的具体应用,包括激光超快直写、激光微阵列印刷、超衍射极限的纳米光学加工以及利用激光加工微纳尺寸杂化结构等技术,展现激光加工技术在当今科; 研与实际应用中的巨大潜力 ...
周锐, 李峰平, 洪明辉
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Evaluation of residual stress and its influence on fracture performance of Q690 thick plate butt welded joint [PDF]
ObjectiveThis study aims to investigate the complex welding residual stress of high-strength steel thick plate with multi-pass welding, and examines the influence of such stress on the fracture behavior of welded joints.
Hongquan ZHAO +6 more
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Estimating the total mortality of seabirds following a marine heat wave
Conservation Biology, EarlyView.Abstract Marine heat waves detrimentally affect a range of marine species, including seabirds, and are increasing in frequency and severity. When thousands of dead seabirds wash up on beaches, the public becomes concerned. However, the number of dead birds recorded on beaches is only a fraction of the total mortality; most birds perish at sea.
Jennifer L. Lavers +3 more
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