Results 31 to 40 of about 6,814 (169)
Using online reports of seahorse seizures to track their illegal trade
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract Illegal wildlife trade (IWT) is a persistent and extensive threat to global biodiversity. Hundreds of marine fish species are subject to regulation under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), but it is unclear how much protection species gain from CITES because information on marine fish ...
Sarah J. Foster +3 more
wiley +1 more source
Gaoya dianqi, 2010 针对高压电器设备电场优化设计常用有限元法（FEM）结合非线性规划法,设计变量改变后需要不断重复FEM的一系列计算过程,存在着大量的重复计算,从而引起计算量大大增加。为此,笔者引入了缩减基有限元法（RBFEM）,推导了基于缩减基法的有限元方程。RBFEM通过计算维数大大减小的缩减基矩阵,使得整个优化过程的计算量大大减小。利用该算法,对500 kV电力变压器设备的绝缘结构进行了优化设计,每计算一次有限元方程,缩减基法需要的时间是FEM的1/4,可大大提高优化效率 ...
马爱清, 江秀臣, 贾一凡
doaj
Sexuality, Gender &Policy, Volume 8, Issue 3, August 2025.ABSTRACT Spanish universities are currently applying different protocols designed to facilitate name and/or gender changes in the documentation of trans, nonbinary, and intersex individuals in their education communities in compliance with the legislation in force. These policies aim to address the discrimination experienced by these people in everyday
Lucas Platero +3 more
wiley +1 more source
Efficient Quadrature-Based Superconvergent Isogeometric Analysis with Macro-Integration Cells and Applications [PDF]
, 2017 摘要 等几何分析采用计算机辅助几何设计中的非均匀有理B样条(NURBS)基函 数进行几何建模和计算分析，实现了几何建模和有限元分析的无缝衔接。由于 NURBS基函数具有高阶连续性和非负性等性质，在进行动力分析时具有突出优 势，例如基于高阶质量矩阵的超收敛等几何频率分析方法。但是，高阶质量矩阵 虽然能够实现频率超收敛计算，但具有波动方向依赖性，即在进行多维波动问题 分析时不能同时提高各阶频率的收敛率，同时多维情况下其数值实现也不够便捷。 本文基于二次等几何基函数 ...
梁庆文
core
Towards a global understanding of tree mortality
New Phytologist, Volume 245, Issue 6, Page 2377-2392, March 2025.Summary Rates of tree mortality are increasing globally, with implications for forests and climate. Yet, how and why these trends vary globally remain unknown. Developing a comprehensive assessment of global tree mortality will require systematically integrating data from ground‐based long‐term forest monitoring with large‐scale remote sensing.
International Tree Mortality Network +114 more
wiley +1 more source
Dianci bileiqi, 2016 结合我国电力设施抗震设计规范（GB 50260—2013）,试验数据及有限元模型,对高压电气设备法兰胶装节点弯曲刚度进行研究。采用有限元方法对500kV氧化锌避雷器建立三种不同模型,计算对比三种模型,研究法兰节点弯曲刚度。提出法兰节点刚度EI的修正系数,提供一种新的建立法兰胶装节点有限元模型的方法。
陈巍, 范荣全, 曹枚根, 卓越
doaj
Studies on optical properties of tip-enhanced Raman/fluorescence system [PDF]
, 2015 针尖增强拉曼光谱（Tip-enhancedRamanspectroscopy，TERS）和针尖增强荧光（Tip-enhancedfluorescence，TEF）具有极高的检测灵敏度和空间分辨率，已经成为表面科学研究中强大的表征手段。尽管TERS及TEF在近年取得了重大的进步，但依然存在许多重大的科学问题尚待解决。如TERS实验中实现的亚纳米空间分辨理论机制已不能用常规的局域电场增强理论来加以解释;进展迅速的STM-TERS技术受到样品和基底导电的严重限制而急需发展普适性更广泛的针尖增强拉曼体系 ...
孟令雁
core
International Journal of Applied Linguistics, Volume 35, Issue 1, Page 274-290, February 2025.Abstract Metacognitive regulation refers to learners’ ability to use a repertoire of metacognitive strategies to guide, observe, and manage thoughts, actions, and emotions in learning activities. It has been widely acknowledged as a significant predictor of language learning success, including writing.
Wandong Xu, Xinhua Zhu
wiley +1 more source
Design of Indoor Base-Station Antennas [PDF]
, 2015 随着无线通信的飞速发展，天线的作用越来越重要，根据应用场景的要求，选择合适的天线类型和结构。当前，无论是基站系统还是移动终端设备，小型化、多功能化、高性能等已成为其基本的技术目标，因此小型化、宽频或多频化、智能化等成为其天线选择和设计的主要内容。对此，微带结构天线是一种较佳的选择，它较易满足此类性能要求。 微带天线的出现将天线的加工成本大大降低，另外微带天线重量轻、体积小可以加工成各种形状，使微带天线在无线通信系统应用中具有优势。微带天线的带宽一般比较窄。怎样提高天线的带宽，同时保持或者降低天线的尺寸 ...
孟阳
core
Equine Veterinary Journal, Volume 57, Issue 1, Page 87-100, January 2025.Abstract Background Radiological findings in the proximal sesamoid bones (sesamoids) are a persistent source of controversy at Thoroughbred sales, due to inconsistent classification and conflicting assignment of potential clinical importance. Objectives To define the prevalence of sesamoid findings on sales repository radiographs in yearling and 2‐year‐
Frances J. Peat +5 more
wiley +1 more source