Results 11 to 20 of about 13,988 (180)
European Policy Analysis, EarlyView.ABSTRACT Policy process research has excelled in explaining structural policy change within national settings, but extensions and applications to the EU level have long proven challenging for scholars. Given that the EU is currently experiencing its longest period of Treaty stability since the 1980s—having evolved into a sui generis political system ...
Vassilis Karokis‐Mavrikos
wiley +1 more source
Growing Demand and Uneven Supply: Eight Years of Nature Education in China 需求增长与供给不均:中国自然教育八年发展回顾
Integrative Conservation, EarlyView.ABSTRACT This study examines the role of nature education in advancing conservation and sustainability in China between 2014 and 2023. Drawing on national survey reports and historical–comparative methods, it analyses the dynamics of public demand, institutional supply, and practitioner capacity.
Qi Yunxi, Lyu Xiang, Huang Yu
wiley +1 more source
A systematic approach in analyzing sustained oscillations in an NF-kB signal transduction pathway system [PDF]
, 2010 Oscillation phenomenon is very common in biological systems. It is crucial to study oscillatory behaviors to understand gene regulation functions.
Lu, B. +2 more
core
Integrative Conservation, EarlyView.This research reveals the functional stability of mixed species foraging flocks (MSF) and their foraging height change with different taxonomic differences along the elevational gradient at Knuckles Montane Reserve, Sri Lanka. This offers new insights into how MSFs sustain with the elevational gradients supporting the altitudinal shifting species ...
Vimukthi. R. Gunasekeara +3 more
wiley +1 more source
Stability Analysis of Deep Foundation Pit of Hechang Trade Center in Quanzhou [PDF]
, 2017 基坑力学特性与变形机理复杂，且具有较强地域性，在进行基坑支护设计及施工时多采用工程经验类比法，为确保基坑的稳定性，需要对基坑稳定性进行较为详细的分析验证。本文针对泉州和昌贸易中心大型深基坑工程，在总结基坑稳定性分析基本原理及验算公式的基础上，进行整体、抗隆起、抗倾覆及抗冲剪稳定性分析验算，得到基坑四种稳定性安全系数，以验证此基坑的稳定性，在此基础上，深入探讨了土层粘聚力、内摩擦角及重度和桩入土深度等因素与基坑四种稳定性安全系数的相互关系，对于基坑工程的稳定性分析具有一定参考意义。本文主要研究结论包括： （
潘志平
core
Rare Metals, EarlyView.ABSTRACT Rare earth elements (REEs) play an irreplaceable role in modern technology and industry. However, due to the highly similar physicochemical properties among REEs, their separation remains a significant challenge. Additionally, REEs often exist in low‐concentration solutions, making efficient REE recovery an urgent task.
Miao‐Miao Huang +6 more
wiley +1 more source
Preparation and Characterization of Anion Exchange Membranes based on Poly(arylene ether)s for Fuel Cells [PDF]
, 2016 燃料电池是一种能够直接把燃料的化学能转化为电能的能量转换装置，具有转化效率高、能量密度高、环境友好等优点。在各种燃料电池中，碱性阴离子交换膜燃料电池(AlkalineAnionExchangeMembraneFuelCells，AAEMFCs)因具有反应动力学快、可使用非贵金属催化剂、燃料渗透率低等优点而受到越来越多的关注。阴离子交换膜(AnionExchangeMembranes，AEMs)作为AAEMFCs的关键组成部分，起到阻隔燃料和氧化剂以及传递OH−离子的作用 ...
赖傲楠
core
Rare Metals, EarlyView.ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi +5 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2023 利用ABAQUS有限元软件对薄壁不锈钢圆管轴压柱的轴压稳定性能进行了数值模拟，并考察了材料性能参数、材料各向异性、初始几何缺陷、径厚比、长细比等因素的影响。分析结果表明：材料各向异性和初始局部缺陷的取值对构件轴压稳定性能影响较小，可以忽略；初始整体缺陷取值对构件轴压稳定性能影响较大，有限元模型中取构件长度的1/2 000可较为准确地模拟试验结果；材料性能参数、径厚比和长细比对构件轴压稳定性能影响较大。通过对不同径厚比构件的分析，提出了防止构件发生局部屈曲的容许径厚比建议公式 ...
朱浩川, 许友武, 姚谏
doaj
Realization of Pan Jiazheng′s extremum principle with optimization methods [PDF]
, 2017 2007-2008 > Academic research: refereed > Publication in refereed journalVersion of ...
Cheng, YM, Wang, JA, Zhao, ZH
core