Results 21 to 30 of about 4,083 (137)

Identifying potentially suitable and accessible refugia to mitigate impacts of an emerging disease on a rare tree

open access: yesConservation Biology, Volume 39, Issue 6, December 2025.
Abstract Identifying refugia from emerging threats is vital to ensure the persistence of rare and threatened species, but modeling habitat distribution for these species is challenging and the role of people in refuge management is rarely considered. Myrtle rust is an emerging infectious disease that represents a grave threat to the rare wetland tree ...
Sarah M. Herbert   +7 more
wiley   +1 more source

基于我国强震动数据的地震动持时预测方程

open access: yesDizhen xuebao, 2018
基于2007—2015年间我国数字强震动观测台网记录到的MW5.0—6.6地震事件中的强震动记录,综合考虑震源、传播路径及场地的影响,采用随机效应回归分析方法建立了适用于中国大陆地区的地震动显著持时预测方程,并与其它地区的预测方程进行了对比分析。结果显示:显著持时随震级和距离的增大而增大,硬土场地的地震动持时整体上略小于软土场地,而且本文给出的地震动显著持时随预测变量的变化趋势与其它研究地区具有一定的相似性。
Peibin Xu, Ruizhi Wen
doaj   +1 more source

Study on Key Technologies of Human Motion Synthesis [PDF]

open access: yes, 2012
随着计算机图形学技术及硬件设备的快速发展,计算机动画技术成为一种重要的数字媒体技术,并已逐渐渗入到人们生活的各个领域。近年来,随着光学运动捕捉设备的普及和运动捕捉技术的发展并逐步成熟,基于运动捕捉的计算机动画技术成为三维计算机动画的主流方法,同时不断产生大规模海量的三维人体运动数据库。高效地复用现有的运动数据库能提高计算机动画制作的效率,降低制作成本。运动合成技术是一种常用的复用技术,它能在已有的运动数据基础上合成满足用户需求的动作,对计算机动画制作具有十分重要的意义 ...
林玲
core  

Importance of connectivity for carnivore richness and occupancy in fragmented biodiversity hotspots

open access: yesConservation Biology, Volume 39, Issue 6, December 2025.
Abstract Structural connectivity affects wildlife movement between habitat patches, contributing to the persistence of wildlife populations and their resilience to human‐induced and environmental changes. However, its importance to wildlife population persistence remains unclear, particularly in fragmented landscapes, where there are additional co ...
Cindy M. Hurtado   +12 more
wiley   +1 more source

Method of fundamental solutions based on geodesic distance for in homogeneous inverse heat conduction problems in anisotropic medium(基于测地距离的基本解方法求解非齐次各向异性IHCP问题)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2009
提出了一种求解非齐次各向异性热传导方程一类反问题IHCP(inverse heat conduction problem)的无网格方法,该方法通过借助基于测地距离的Multiquadric(MQ)作为基函数得到整个时间空间区域上的一个近似特解,然后用基于测地距离的基本解方法直接在整个时间空间区域上对相应的齐次问题进行求解.用截断奇异值分解(TSVD)法求解所得病态线性方程组,用L-曲线准则确定正则化参数.用数值例子验证了该方法的有效性,并分析了数值解的精度与参数T、c的关系.
WANGJin-yu(王金玉)   +1 more
doaj   +1 more source

Changing fish invasion patterns associated with community fish species turnover in 15 Chinese plateau lakes

open access: yesFunctional Ecology, Volume 39, Issue 10, Page 2743-2757, October 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Biological invasions threaten both biodiversity and ecosystem functioning, yet the role of functional and phylogenetic relationships between invaders and the recipient community in invasion success remains controversial.
Songhao Ji   +7 more
wiley   +1 more source

通渭地震台井下地电阻率观测及其影响系数分析

open access: yesDizhen xuebao
通渭地震台因受宝兰高铁运行的显著干扰(距最近电极仅600 m),其地表地电阻率观测数据可靠性下降,遂于 2021 年建成井下地电阻率观测系统,以保障观测的连续性。应用现有的电位解析表达式及程序,基于通渭台电测深反演数据,对通渭台井下地电阻率观测影响系数随埋深和供电极距的变化进行了分析。结果表明:① 通渭台在供电极距一定时,各层影响系数与电极埋深之间呈现出复杂的变化关系;② 在电极埋深固定时,浅层介质的影响系数通常先上升后下降,深部介质的影响系数随着极距的增加而上升。在此基础上,以通渭台具体观测参数 ...
Jie Zhao   +8 more
doaj   +1 more source

Image retargeting through fusion of contour and region information [PDF]

open access: yes, 2012
图像显示适应面临展示面积受限、长宽比不固定等问题,已经成为多媒体领域的研究热点之一。关键是收缩后能够凸显图像重要区域,保持连续,避免扭曲。提出了一种基于区域轮廓能量的图像显示适应算法,通过对图像的视觉显著度分析,得到符合人类视觉的图像区域轮廓能量分布图。这样,在缩放过程中,删除或复制表示非敏感内容的低能量线,并且在显示图像内容的同时突出图像中的显著区域。实验结果表明,该方法保持了图像中显著目标的原始比例,具有很好的抗畸变性能。Image retargeting techniques aim to ...
杜晓凤, 陈诚, 马金素
core  

A global indicator of species recovery

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Monitoring progress toward meeting global biodiversity goals involves several indicators, including, at the species level, the International Union for Conservation of Nature (IUCN) Red List Index (RLI) and the Living Planet Index (LPI). However, at present, there is no indicator specifically for tracking species recovery, despite this being ...
H. Resit Akçakaya   +4 more
wiley   +1 more source

Next‐Generation Sequencing of Fecal DNA: A Novel Insight Into the Mitogenome Phylogeography of the Snow Leopard (Panthera Uncia) 粪便dna的二代测序:对雪豹线粒体组谱系地理结构的新洞察

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 277-286, September 2025.
This study provides an innovation to address the challenge in accessibility to samples and genetic markers in Snow leopard conservation genetic studies. We performed next‐generation sequencing (NGS) on 19 fecal samples obtained from the eastern Qinghai‐Tibet Plateau, and successfully assembled 17 complete mitogenome sequences (~16,720 bp) and ...
Chen Cheng   +7 more
wiley   +1 more source

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