Results 41 to 50 of about 15,044 (198)

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.
Brief summary: 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.
Mylange Dona Kasundi Mekhala Gunasena   +2 more
wiley   +1 more source

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

组合椭圆介质波导的高阶有限元分析

open access: yesGuangtongxin yanjiu, 1988
本文应用二次有限单元法分析计算了椭圆边界组合介质波导的色散特性,编制了相应的有限元程序,并与已有的结果作了比较。
蒲国胜, 廖承恩
doaj  

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

齿轮可靠度计算的概率有限元法(第Ⅱ部分:齿面接触疲劳强度的计算)

open access: yesJixie chuandong, 1993
本文将概率有限元法用于齿轮接触疲劳强度可靠度的计算。以功率、转速和疲劳极限为随机变量,在求解接触问题的有限元—线性规划法基础上,建立了相应的概率有限元基本方程及求解方法。该方法不仅可用于齿轮接触疲劳的可靠度计算,也可用于其他弹性体接触问题的可靠度计算。
吴立言, 刘更, 王步瀛
doaj  

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

嵌体修复下领第一磨牙残冠的三维有限元模型的建立

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2005
【目的】建立带桩嵌体修复下颌第一磨牙残冠的三维有限元模型。【方法】制成第一磨牙残冠的制锁式带桩嵌体修复体的模型,将该模型置于水杯中,利用螺旋CT扫描,通过图像合成软件建立三维数字模型,结合大型有限元软件ANSYS进行建模。【结果】建成后三维有限元模型与实体组织具有良好的几何相似性。【结论】将牙体修复模型置于水中,经螺旋CT扫描并与有限元方法结合起来,可以建立复杂的牙模型,且能真实地模拟实际情况,使用性好。
连克乾   +4 more
doaj  

地震波动谱元法数值模拟研究进展

open access: yesDizhen xuebao
基于谱元法的地震波动数值模拟已被广泛用于地震震源破裂、大规模地震波传播、区域复杂场地及工程结构(群)地震反应、地震层析成像等重要问题的研究及应用当中,是目前地震工程学、地震学和地球物理学等地震科技领域共同关注的前沿热点技术。早期发展的切比雪夫谱元法(CSEM)和勒让德谱元法(LSEM)更接近谱方法的域分解思路,其形式相对复杂且计算效率较低。目前广泛使用的是一种形式简洁的LSEM,其实施步骤和主要公式已经与有限元法完全一致,仅通过内置的高斯-洛巴托-勒让德(GLL)高精度数值积分保留着与谱方法之间的联系 ...
Haojie Xing, Hongjing Li, Ruirui Nan
doaj   +1 more source

特高压用大容量优比特性电容器内熔丝熔断特性试验研究

open access: yesGaoya dianqi, 2021
对于交流特高压工程中使用的并联电容器单元,一般有多台电容器单元并联连接,当其中一台电容器单元内部元件击穿时,与其并联的电容器单元将有部分能量注入,会对内熔丝的熔断产生一定的影响。为了验证电容器单元在多台并联连接的情况下内熔丝熔断特性,文中采用型号为BAM7.88-668-1W的并联电容器单元,通过增加并联陪试品的方法来模拟实际运行工况。对试品进行人为的机械穿刺来模拟元件击穿,试验结果表明,在有陪试并联电容器单元存在的情况下,熔丝隔离试验的电压下降程度会大幅度减小。测试结果中 ...
国江   +5 more
doaj  

Deconstructing Policy Evaluation in the Global South: Historical, Political, and Transnational Influences

open access: yesPolitics &Policy, Volume 53, Issue 5, October 2025.
ABSTRACT Policy evaluation is crucial for effective governance and development in the Global South, yet its institutionalization is shaped by a complex interplay of historical, political, and transnational factors. This study examines how colonial legacies, domestic political dynamics, and external influences converge to influence policy evaluation ...
Anis Ben Brik
wiley   +1 more source

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