Results 21 to 30 of about 12,381 (169)
Experimental study of flap on controlling wake vortex [PDF]
, 2015 飞机尾流是现代民航机飞行过程中产生的一种大尺度、高能量的漩涡，是飞机在产生升力的同时不可避免的结果。它的存在严重威胁着后续飞机的飞行安全。为了避免后续飞机遭遇尾流发生事故，国际民航组织(ICAO)设置了最小尾流间隔标准，但长时间未消散的尾流限制了机场飞机的起降频率，造成很多大型机场拥挤不堪。针对如何使尾流快速消散的问题，国内外学者进行了深入的研究，现在比较受认可的尾流控制方式是主动在主翼涡周围引入一个扰动来诱发翼尖涡的不稳定性使其快速消散。 本文所有工作均在厦门大学流体 ...
傅向向
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A Multifunctional Reducing Molecular Dopant for 16% Efficient Tin Perovskite Solar Cells
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Although lead‐based photovoltaics have seen remarkable progress, tin‐based perovskite solar cells (Sn‐PSCs) continue to face challenges due to their limited power conversion efficiency and insufficient operational stability. The primary cause of this performance gap is the susceptibility of Sn2+ to oxidation, which promotes rapid defect ...
Xianyong Zhou +12 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Chemically self‐charging aqueous zinc‐ion batteries (AZIBs) have emerged as promising candidates for energy storage technologies owing to their environmental autonomy and structural simplicity. Nonetheless, the self‐charging performance is significantly compromised by the limited potential difference between cathodes and oxygen, as well as the
Yan Wang +5 more
wiley +1 more source
Structure, Magnetic and Electronic Transport Properties of New-Type Magnetic Nanocluster Assembled Thin Films [PDF]
, 2015 纳米粒子以及由它们构成的纳米结构材料由于具有尺寸效应、量子限域效应和界面效应，通常显示出许多不同于常规块体材料的磁、光、电等特性，在现代工业、国防和高新技术发展中充当着重要的角色。纳米粒子复合薄膜材料由于其兼有复合材料和纳米材料两者的优点，引起了越来越多的关注，并成为一个重要的前沿研究领域。 本论文的研究工作包括两个方面：1）利用纳米粒子束流复合薄膜沉积系统将由等离子体溅射惰性气体冷凝法制备的Fe65Co35合金纳米粒子原位封装到由常规磁控溅射制备的Ni0.5Zn0.5Fe2O4薄膜中 ...
王俊宝
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Governance of Climate‐Induced Relocation in the US: An Exploration of Institutional Complexity
Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT Climate change has and will continue to have a profound effect on both individuals and the communities in which they reside. A pressing question is how communities forced to confront climate‐induced catastrophe—including both rapid and slow‐onset hazards—undertake the decision of how and when to relocate, particularly given the multiple scales
Christopher S. Galik, Brad A. Johnson
wiley +1 more source
Development and Application of the Online Photochemical Vapor Generation Technique Coupled with ICPMS [PDF]
, 2015 光化学蒸气发生技术（PCVG）应用于痕量元素分析方面具有诸多优势：由于它是一种气体进样技术，其样品传输效率几乎接近100%；实现了分析物与样品基体的分离，从而减少基体对检测过程的干扰；挥发性产物经气液分离后被引入检测器，避免了液体进样时原子化器/离子源温度降低，进而影响方法性能的情况；添加的小分子有机试剂还原性较弱，过程中产生的氢气量较少，有利于后续检测仪器的稳定；试剂最终光解为H2O、CO2等小分子，对环境十分友好。正因为这些优点，PCVG受到越来越多分析工作者的关注，并开展了大量的元素分析、形态分析、
段华玲
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Developing low‐energy‐input electrocatalytic systems for efficient hydrogen production is crucial for advancing sustainable energy technologies. The overall hydrazine splitting (OHzS) has emerged as a promising strategy to reduce the overall energy consumption by replacing the sluggish oxygen evolution reaction.
Haozhou Chen +13 more
wiley +1 more source
Applicability and Structure Optimization of Cyclone Separator Based on Numerical Simulation [PDF]
, 2015 旋风分离器是一种利用气-固两相流体的涡旋运动使固体颗粒在离心力的作用下从气流中分离出来的设备，它具有结构简单、操作维护简便、制造安装价格低等优点，被广泛应用于石油、化工、冶金等领域。由于其内部流场具有强旋流湍流特征，气流和颗粒的运动十分复杂，传统的实验方法很难深入研究其内部流场规律和分离机理，随着计算流体动力学的发展，数值仿真分析成为研究旋风分离器的主要手段。 旋风分离器的工况和结构参数会对其性能产生决定性影响。对于一个给定的旋风分离器，其工况参数包括颗粒半径、颗粒密度和入口速度 ...
吕智
core
World Water Policy, Volume 12, Issue 1, February 2026.ABSTRACT Water security in tropical regions faces escalating pressures from climate change, land‐use shifts, and population growth. We conducted a bibliometric review of 1146 peer‐reviewed articles (1964–2023) on tropical water security. Latent Dirichlet Allocation identified 13 thematic topics and their evolution. Publications rose sharply after 2012,
Karling Fernanda Schuster +3 more
wiley +1 more source
Shiyou jixie, 2015 涡流工具排液是一种新型气井排水采气工艺。目前国内外针对井下涡流工具的室内及现场试验，仅获得部分宏观工作特性，缺乏深入的理论研究，具体排液机理不够清晰，限制了该工艺的推广应用。鉴于此，采用有限元分析方法建立涡流工具气液两相螺旋流动的数值模型，并借助CFD软件对其流动过程进行仿真。通过流动规律的预测及分析，确定出井下涡流工具排水采气机理。研究结果表明，涡流工具可形成螺旋上升的管壁液膜流和快速上升的中心气核流动；引发的高速螺旋涡流，有效降低了气液流动阻力，提升了采气速度，同时增强了气流的携液能力 ...
杨旭东, 李丽, 张军, 卫亚明
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