Results 41 to 50 of about 6,166 (164)
Hydrogen embrittlement susceptibility of the X70 pipeline steel substrate and weld in simulated coal gas containing hydrogen environment [PDF]
, 2017 The diffusion and accumulation behaviour of hydrogen in X70 pipeline steel were investigated via hydrogen permeation test, hydrogen diffusion simulation, and hydrogen content test technology in a simulated coal gas environment (4 MPa total pressure, 0.2 ...
GUAN Hong-peng +6 more
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World Water Policy, Volume 12, Issue 1, February 2026.ABSTRACT Urban expansion significantly impacts flood risk, particularly in rapidly growing areas where impervious surfaces exacerbate surface runoff. This study examines spatial patterns of urban growth and their effects on flood exposure in Mecklenburg County, North Carolina, from 2011 to 2021.
Pegah Madadi, Azad Sadeghi
wiley +1 more source
Research and Design of the Water Jet Guided Laser Processing System [PDF]
, 2010 随着激光加工技术在工业加工领域的深入应用，新的激光加工技术和加工方法不断涌现。其中，水导引激光技术因其突破了传统激光加工技术的诸多限制而得到了国内外激光研究领域的广泛关注。水导引激光技术作为新型的激光加工技术是一种将激光加工同水射流结合起来的新型加工技术。相比传统激光加工，水导引激光加工通过激光与水射流的精密的耦合形成水导引激光，具有有效加工距离长和无热区影响等优点。 本课题从研究水导引激光加工机理出发，研究了激光同水射流的耦合条件和耦合效率的决定性因素 ...
沈阳
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Conservation Biology, Volume 40, Issue 1, February 2026.Abstract Spatial segregation in at‐sea distribution is frequently observed in seabirds and can have important implications for conservation and management. Globally, many albatross and petrel populations are declining due to bycatch in fisheries. In South Georgia, the decrease in wandering albatrosses (Diomedea exulans) differs among breeding sites ...
V. Warwick‐Evans +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2022 流溪河水库流域是亚热带典型的山地河源区,研究此流域的碳氮营养盐浓度时空变化特征及其影响因素对揭示亚热带流域生物地球化学循环与保障水资源供给具有重要意义。基于地形、气象、土地利用、土壤和实地采样获得的水质数据,采用相关分析及Elastic Net回归分析法,探讨了流溪河水库流域溪流碳氮营养盐浓度的时空变化特征及其影响因素。结果表明:(1)从时间上看,枯水期各采样点溪流碳氮营养盐浓度总体变化不大,但空间差异明显,其中NO3-与NH4+浓度具有强相关性。(2 ...
牛香豫 +4 more
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Novel Coupling System of Water-jet Guided Laser [PDF]
, 2009 由于现有水导引激光系统存在对激光焦点和喷嘴口中心点的耦合要求高的缺点,利用轴棱锥产生的无衍射光束具有中心光斑直径小且传播距离远的特性,设计了一种用轴棱锥替代聚焦透镜的新型水导引激光耦合.该系统是基于现有的水导引激光原理,利用无衍射光束的特性,扩大了激光与水束的耦合区域,降低了耦合精密度要求.同时,具有加工距离长、无热影响区等优点,该系统的研究也扩展了无衍射光束应用领域.Due to the existing water-jet guided laser have strict coupling ...
叶瑞芳, 沈阳, 王磊, 黄元庆
core
Evolution of research on global amphibian declines
Conservation Biology, Volume 40, Issue 1, February 2026.Abstract In the late 1980s, the scientific community became aware of severe, enigmatic amphibian population declines. These declines triggered a wave of research focused on quantifying their extent and identifying key drivers. We used text‐analysis techniques, including topic modeling and geoparsing, to examine the evolution of research focused on ...
Jordann Crawford‐Ash +6 more
wiley +1 more source
Weldment Corrosion of 316 Stainless Steel in Nuclear Power Plant Studied by Electrochemical and Surface Analysis Techniques [PDF]
, 2011 316不锈钢以其优良的耐蚀性能、加工性能和高温抗氧化性能而被广泛应用 于核电、石油、化工等领域。316不锈钢在应用施工过程中需要通过焊接成型， 然而在焊接过程必然导致焊接区域出现化学成分、组织形态和相关性能的改变， 使得不锈钢在焊缝和焊接接头处优先发生腐蚀，严重影响不锈钢设备的使用寿命 和安全性能。因此，研究不锈钢焊接后的组织、成分变化与焊缝腐蚀的关系，发 展不锈钢焊缝腐蚀原位实时检测技术，对如何采取有效途径预防316不锈钢焊缝 腐蚀，保证材料设备使用安全等方面具有重大的现实意义。 近年来 ...
杨旺火
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Integrative Conservation, Volume 4, Issue 4, Page 555-568, December 2025.Sri Lanka's biodiversity is threatened by habitat loss, climate change, and ineffective traditional conservation methods. Integrating plant tissue culture and DNA barcoding offers scalable, precise tools for conserving rare and endemic species. This review emphasizes the potential of biotechnological approaches to enhance conservation accuracy and ...
Mylange Dona Kasundi Mekhala Gunasena +2 more
wiley +1 more source
Gaoya dianqi, 2023 双层电介质广泛应用于高压电气设备绝缘系统中，由此引入的空间电荷积聚和局部电场畸变问题已得到普遍关注。为揭示界面空间电荷特性及其影响影响因素，文中以热老化处理（130℃）的双层聚酯薄膜（PET）为研究对象，采用电声脉冲法（PEA）测量技术对不同热老化程度双层介质的空间电荷特性进行研究，基于测试结果从3个方面对双层介质表面态特性进行表征，建立改进的双极性电荷输运模型（BCT），模拟空间电荷的动态演变过程，揭示了表面态对电荷特性的影响规律。试验结果表明：随着老化时间增加，界面电荷密度先增加后减小 ...
姜雄伟, 金涌涛, 韩睿, 彭庆军
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