Results 21 to 30 of about 7,920 (167)

A new method for broad‐scale modeling and projection of plant assemblages under climatic, biotic, and environmental cofiltering

open access: yesConservation Biology, Volume 36, Issue 2, April 2022., 2022
Abstract There is increasing interestin broad‐scale analysis, modeling, and prediction of the distribution and composition of plant species assemblages under climatic, environmental, and biotic change, particularly for conservation purposes. We devised a method to reliably predict the impact of climate change on large assemblages of plant communities ...
Alessandro Ferrarini   +3 more
wiley   +1 more source

Research progress in Li-ion battery pack inconsistency control [PDF]

open access: yes, 2017
总结电池均衡、成组方式和热管理的研究方法及问题。电池均衡技术主要有电池均衡电路、电池均衡控制策略;电池成组方式主要有电池串并联方式、电池连接阻抗;电池热管理主要有电池生热特性 ...
冯自平, 吕杰, 宋文吉, 罗卫
core   +1 more source

Participation Disenchants: How Online Political Participation Decreases Online Political Efficacy in China

open access: yesRegulation &Governance, Volume 20, Issue 1, Page 35-63, January 2026.
ABSTRACT Existing literature largely agrees that authoritarian regimes establish channels for political participation to gather valuable information on citizens' anti‐regime sentiments and policy preferences and to supervise lower‐level bureaucrats and firms.
Anton Bogs
wiley   +1 more source

The study of Mitochondrial DNA Gene Rearrangement in 4 species of birds(Aves: Falconiformes) [PDF]

open access: yes, 2016
线粒体控制区由于进化速率快,被作为分子标记广泛应用于种群遗传学和保护生物学等领域的研究。但最近在许多鸟类的线粒体中都发现控制区存在重复拷贝,并且2个控制区拷贝之间的碱基相似度较高。因此在扩增其中一个控制区基因时可能受到另一个控制区的干扰,而对研究结果产生影响。本研究主要针对隼形目鸟类线粒体DNA(mtDNA)基因组中控制区重复及由此产生的基因重排现象进行研究,初步探讨控制区重复和基因重排产生的过程和机制。 本次实验首次对鹰科中的白头鹞(Circusaeruginosus)、日本松雀鹰 ...
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core  

Interpregnancy interval and risk of recurrence following tubal ectopic pregnancy: retrospective cohort study from UK tertiary center

open access: yesUltrasound in Obstetrics &Gynecology, Volume 66, Issue 1, Page 89-95, July 2025.
ABSTRACT Objective To assess the effect of interpregnancy interval on the odds of recurrence of tubal ectopic pregnancy (TEP) following expectant or surgical management. Methods This was a retrospective cohort study conducted at a tertiary early pregnancy unit (EPU) in London, UK.
W. M. Dooley   +6 more
wiley   +1 more source

基于VMD与优化SVM的变压器绕组松动缺陷振动信号诊断方法

open access: yesGaoya dianqi, 2023
随着电力系统中变压器容量的不断增加,变压器绕组松动缺陷引起的影响也愈发严重,故需进行故障诊断。针对利用振动信号进行变压器绕组松动缺陷诊断问题,提出基于变分模态分解(VMD)排列熵(PE)的变压器振动信号特征提取方法与天牛须搜索(BAS)优化支持向量机(SVM)的变压器绕组松动缺陷诊断方法。首先对一台实际110 kV变压器设置不同松动状态,采集绕组正常与不同松动程度状态下振动信号;其次,采用变分模态分解结合排列熵进行变压器绕组松动缺陷特征提取;再次,采用天牛须搜索优化支持向量机算法进行绕组松动状态模式识别。
顾仲翔   +4 more
doaj  

750 kV/330 kV混压同塔四回输电线路“100 Hz”纯声分布规律研究

open access: yesGaoya dianqi, 2021
为了获取750 kV/330 kV混压同塔四回输电线路产生的"100 Hz"纯声分布规律,文中基于美国EPRI提出的大雨条件下单位长度导线纯声激发量计算公式,建立了750 kV/330 kV混压同塔四回输电线路纯声传播模型,并与宽频带噪声A计权声级进行对比分析,得到不同导线排列方式下、不同高度处以及考虑时间和空间的"100 Hz"纯声分布规律。结果表明:在混压同塔架设方式下,"100 Hz"纯声驻波关于中心线不对称;随着到中心线的距离增加,纯声驻波振荡衰减,且相邻波峰间的距离越来越大;同一位置处 ...
张建功   +5 more
doaj  

非纵弯线气枪震源陆地反射资料叠加成像

open access: yesDizhen xuebao, 2020
为探索大容量气枪震源在深部地震探测中的应用,2015年10月在安徽铜陵段开展气枪流动激发试验。该试验采用沿长江航道激发、岸边固定排列接收的工作方式,因受长江航道及江岸地形的影响,加上原始记录中干扰波发育、静校正问题突出等,基于常规的共中心点叠加的数据处理方法已不再适用。为此,开展了针对性的数据处理方法研究。本文采用初至波层析静校正、叠前多域多道集去噪以及非纵弯线共反射面元叠加等一系列处理技术,结果显示所获测线经过区域的深部构造叠加剖面较清晰。
Jingjing Qin   +6 more
doaj   +1 more source

Using life history traits to assess climate change vulnerability in understudied species 利用生活史特征评估研究不足物种的气候变化脆弱性

open access: yesIntegrative Conservation, Volume 3, Issue 4, Page 368-381, December 2024.
Lack of species information complicates understanding climate change vulnerability, but life history traits can be proxies for missing information. In the north‐central United States, useful traits for discriminating vulnerability of amphibians include range size, clutch size, diel activity patterns, and habitat breadth.
Ross K. Hinderer   +2 more
wiley   +1 more source

Velocity Analysis of a Flow Passing over a Vegetated Slope [PDF]

open access: yes, 2014
A sheet flow or overland flow is simulated by the theory of laminar flow passing over a grassed slope with wood. The flow region is divided into two layers (vegetation layer & soil layer) or three layers (wood layer, vegetation layer & soil layer ...
Ching-Ya Tang   +3 more
core  

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