Results 31 to 40 of about 7,363 (169)

Integrating Plant Tissue Culture and DNA Barcoding: Cutting‐Edge Technologies for Plant Conservation in Sri Lanka 整合植物组织培养与dna条形码技术:斯里兰卡植物保护的前沿技术

open access: yesIntegrative 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

RBFEM在电场快速优化设计中的应用

open access: yesGaoya 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  

Studies on optical properties of tip-enhanced Raman/fluorescence system [PDF]

open access: yes, 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  

Prospects and perils in the geospatial turn of conservation

open access: yesConservation Biology, Volume 39, Issue 6, December 2025.
Abstract Conservation has embraced advances in big data and related digital technologies as key to preventing biodiversity loss, especially in the identification of areas of conservation priority based on spatial data, which we call the big geospatial data turn.
Jocelyne Shimin Sze, Laura Aileen Sauls
wiley   +1 more source

Understanding Student Preparedness to Handle L2 Writing Curriculum Transitions: A Hidden Curriculum Perspective

open access: yesInternational Journal of Applied Linguistics, Volume 35, Issue 4, Page 2063-2077, November 2025.
ABSTRACT Despite the efforts devoted to improving L2 writing pedagogy to promote student writing development, students’ dissatisfactory writing development and outcomes are still reported. Investigating student learning preparedness to navigate L2 writing curriculum transitions may generate new understandings and provide an alternative explanation for ...
Yu Zhou, Shulin Yu
wiley   +1 more source

高压电气支柱法兰胶装结点等效弯曲模量研究

open access: yesDianci 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  

Design of Indoor Base-Station Antennas [PDF]

open access: yes, 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  

Using online reports of seahorse seizures to track their illegal trade

open access: yesConservation 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

Efficient Quadrature-Based Superconvergent Isogeometric Analysis with Macro-Integration Cells and Applications [PDF]

open access: yes, 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  

Exploring Characteristics of Emerging Nature Education Practices in China: Content Analysis of Lesson Plans 《探索中国新兴自然教育实践的特征:课程计划的内容分析》

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 322-333, September 2025.
A content analysis of 154 nature education lesson plans from China showed that educators designed diverse programs tailored to age‐specific developmental and social needs. Most focused on personal growth, such as cognitive development, mental well‐being, and family bonding, but few explicitly addressed environmental conservation goals.
Yue Li, Danning Lu, Xin Yu, Chuan Liao
wiley   +1 more source

Home - About - Disclaimer - Privacy