Results 171 to 180 of about 586,100 (219)

Land use overrides climatic controls on soil organic nitrogen transformations: Contrasting responsiveness between forest and cropland ecosystems

open access: yesFunctional Ecology, Volume 40, Issue 7, Page 2128-2142, July 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Soil organic nitrogen (SON) transformation is critical for global nutrient cycling and ecosystem productivity, yet how its responsiveness to climate change differs across diverse land use types remains poorly resolved.
Xinyi Yang   +10 more
wiley   +1 more source

Complete elliptic Fourier descriptor normalization and its application in quantitative morphological analysis

open access: yesMethods in Ecology and Evolution, Volume 17, Issue 7, Page 2123-2134, July 2026.
Abstract Elliptic Fourier analysis (EFA) is often employed in geometric morphometrics (GM), but the normalization of elliptic Fourier descriptor (EFD) has persistently posed challenges for obtaining unique and comparable results, especially in the application of outline‐based GM methods, which limits the implementation in automated analysis of numerous,
Hui Wu   +6 more
wiley   +1 more source

负弯矩作用下全宽预应力预制桥面板组合梁力学性能研究

open access: yesJianzhu Gangjiegou Jinzhan
横向全宽预应力预制桥面板与分块预制桥面板相比,整体性更好,施工更快捷,在装配式组合梁桥中具有较好的应用前景。负弯矩作用下预制桥面板的湿接缝连接是受力的关键部位,为此对负弯矩作用下的全宽预应力预制桥面板组合梁的力学性能进行研究,明确了横向预应力筋数量、预应力筋布置方式、剪力连接程度、接缝处材料对结构破坏模式、开裂荷载、抗弯承载力、荷载-位移曲线等力学特性的影响规律,揭示了预制板接缝处的应力分布规律;针对完全剪力连接的预制桥面板组合梁,提出了负弯矩作用下挠度计算的改进有效惯性矩叠加法 ...
陈娟   +4 more
doaj  

[Research progress of electroactivity graphene-based materials in bone repair]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Kang R, Yuan W, Zhu Y.
europepmc   +1 more source

反应动力学

open access: yes, 1980
陶愉生译, M.J.皮林著
core  

Simultaneous Generation of Topographic Models and Manning Roughness Coefficient Maps From Tri‐Stereoscopic Satellite Images: Application to the Huarmey River, Peru

open access: yesThe Photogrammetric Record, Volume 41, Issue 195, July/September 2026.
Tri‐stereoscopic PeruSat‐1 imagery enables the simultaneous generation of 0.70 m‐resolution topography and spatially distributed Manning roughness maps, achieving 0.434 m vertical accuracy. Integrated into HEC‐RAS, these products provide consistent, high‐resolution inputs that improve hydraulic modelling and flood risk assessment in data‐scarce river ...
Jorge L. Miranda‐Pita   +3 more
wiley   +1 more source

Analysis of Several Design Issues for Unbonded Continuously Reinforced Concrete Overlays Based on Current Specifications

open access: yes工程科学与技术
旧水泥路面板上分离式加铺连续配筋水泥混凝土(CRC)层是一种旧水泥路面延寿加铺形式,但在现行规范中相关结构设计方法存在一定不足。基于加铺结构的特点建立ABAQUS三维有限元模型,开展加铺结构温度及荷载应力响应分析,探讨现行设计方法在力学模型处理、应力分析及极限状态校核等方面的适用性与局限性,提出相应的解决方法与思路。结果表明:计算CRC板荷载应力时将半刚性基层与旧水泥板复合,计算旧水泥板荷载应力时将半刚性基层并入地基的形式最好,推荐隔离层厚度取5~6 cm,对应刚度系数450 MPa/m ...
李盛   +4 more
doaj  

[Price effects of global vaccine pooled procurement]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Huang Y, Yu X, Xu M.
europepmc   +1 more source

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