Results 21 to 30 of about 11,946 (173)

Fostering Children's Self‐Efficacy Through Nature Education: Insights From a Wildlife Education Program in Rural China 通过自然教育培养儿童的自我效能感:中国乡村自然课项目的启示

open access: yesIntegrative Conservation, Volume 4, Issue 2, Page 154-164, June 2025.
This study identified self‐efficacy as a crucial outcome of nature education, with the potential for achieving long‐term conservation goals. Using a mixed‐methods design, we evaluated the effect of a wildlife course implemented in ten rural elementary schools in China, which significantly increased students' self‐efficacy, and also contributed to pro ...
Zhijian Liang   +6 more
wiley   +1 more source

Agricultural Lands as Important Wintering Habitats for the Critically Endangered Yellow‐Breasted Bunting in Nepal 尼泊尔农业用地作为极危黄胸鹀的重要越冬栖息地

open access: yesIntegrative Conservation, Volume 4, Issue 2, Page 134-142, June 2025.
Our study addresses the significant knowledge gap regarding the wintering population and habitat utilization of the Yellow‐breasted Bunting (Emberiza aureola) in Nepal, providing crucial insights that can aid in the conservation of this critically endangered species in wintering grounds.
Hem Bahadur Katuwal   +6 more
wiley   +1 more source

高密度脂蛋白与 C反应蛋白比值对非透析慢性肾脏病进展的预测作用

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2022
目的探讨高密度脂蛋白(HDL)与C反应蛋白(CRP)比值(HDL/CRP)对非透析慢性肾脏病(CKD)患者肾功能恶化的预测作用。方法纳入2015年至2019年就诊于中山大学附属第三医院(天河院区、岭南院区),有至少2次随访数据的非透析慢性肾脏病患者。通过电子病案系统录入患者基线人口特点及生化检查结果。根据Ln(HDL/CRP) 四分位间距分组,正态分布连续性变量通过one-way ANOVA方差分析、非正态连续性变量通过Kruskal-Wallis秩和检验、分类变量通过卡方分析对患者人口数据 ...
汤磊乐   +5 more
doaj  

Effects of snake fungal disease (ophidiomycosis) on the skin microbiome across two major experimental scales

open access: yesConservation Biology, Volume 39, Issue 2, April 2025.
Abstract Emerging infectious diseases are increasingly recognized as a significant threat to global biodiversity conservation. Elucidating the relationship between pathogens and the host microbiome could lead to novel approaches for mitigating disease impacts.
Alexander S. Romer   +25 more
wiley   +1 more source

柱面Kelvin多面体空间网壳的承载力和稳定性能研究

open access: yesJianzhu Gangjiegou Jinzhan, 2019
Kelvin多面体空间刚架是一种新型的空间结构形式。首先采用弯曲起拱方式建立了柱面Kelvin多面体网壳模型;接着研究了切割面位置、边界条件、旋转角度和荷载分布对网壳静力承载力的影响;最后分别采用几何非线性和双非线性方法,研究了不同工况下网壳的稳定承载性能。结果表明:相同工况下,旋转60°时网壳相比未旋转时的轴力减小、弯矩变化不大,两侧边支承时网壳相比四角点支承时的轴力增大、弯矩较小;柱面Kelvin网壳以局部屈曲模态为主,几何非线性分析时的荷载-位移曲线基本呈线性增长,双非线性分析时在最大竖向位移为0.
庞崇安, 王震
doaj  

Social science integration at state and federal fish and wildlife organizations in the United States

open access: yesConservation Biology, Volume 39, Issue 2, April 2025.
Abstract Increasingly, conservation professionals and scholars recognize the need for more holistic integration of social science in fish and wildlife management. This call is often framed around the complexity of 21st century conservation challenges and changing societal values toward fish and wildlife and its management.
Michael R. Quartuch   +7 more
wiley   +1 more source

薄壳非线性稳定理论的最新发展

open access: yesJianzhu Gangjiegou Jinzhan, 2006
本文回顾了近代非线性薄壳稳定理论的发展历史,认为薄壳稳定理论的研究大体经历了三个阶段:第一阶段为针对完善结构的线性弹性理论;第二阶段为考虑结构几何缺陷的非线性弹性理论;第三阶段为考虑实际材料性能的非线性弹塑性理论。目前正在进入第四阶段,即开始考虑结构物理缺陷的影响。最新的三个主要研究方向是:1)非线性薄壳有限元分析方法;2)材料局部损伤过程对薄壳稳定性的影响;3)带裂纹薄壳的稳定性分析。文中分别就这三个方向的研究现状进行了调查分析,并对今后的研究趋势进行了展望。
周利, 黄义
doaj  

Routine 36‐week scan: diagnosis and outcome of abnormal fetal presentation

open access: yesUltrasound in Obstetrics &Gynecology, Volume 65, Issue 2, Page 154-162, February 2025.
ABSTRACT Objectives First, to report the incidence of non‐cephalic presentation at a routine 36‐week ultrasound scan, the uptake and success of external cephalic version (ECV) and the incidence of spontaneous rotation from non‐cephalic to cephalic presentation.
M. Fitiri   +5 more
wiley   +1 more source

基于直接分析法的钢结构非线性施工过程分析

open access: yesJianzhu Gangjiegou Jinzhan
对于大型复杂空间钢结构,可靠的施工过程分析对保障施工安全性和钢结构安装质量具有重要意义。在传统施工过程分析与钢结构直接分析的基础上,提出一种考虑构件和安装模块初始缺陷以及变形累积的钢结构非线性施工过程分析方法。利用NIDA软件将该方法应用于成都某大悬挑钢桁架结构的施工过程分析中,确保了施工方案的可行性。同时,对比分析了非线性施工过程分析、一次成型分析和线性施工过程分析3种分析工况下结构关键节点位移及构件应力情况,并与施工实测值进行了比对。结果表明,一次成型分析与线性施工过程分析的位移较实测值偏小 ...
刘宏伟   +5 more
doaj   +2 more sources

高非线性光子晶体光纤非线性系数的分析

open access: yesGuangtongxin yanjiu, 2007
文章采用全矢量有限元法(FVFEM)对不同结构参数的光子晶体光纤(PCF)进行数值分析,得出了基模模场分布,进而计算出高非线性PCF非线性特性的两个重要的基本物理量:有效面积Aeff和非线性系数γ,并分析了Aeff和γ与PCF的结构参数空气孔直径d和空气孔间距Λ之间的关系。
吴铭, 刘海荣, 黄德修
doaj  

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