Results 31 to 40 of about 8,141 (130)
Guangtongxin yanjiu, 1999 本文采用在ＩＴＵ－ＴＧ．８０５建议中定义的传送网通用功能结构模型，建立了ＰＤＨ传送网功能结构模型；在这一传送网功能结构模型的基础上，结合ＰＤＨ光传输系统的网管要求，建立了网元观点的ＰＤＨ光传输系统信息模型。
王志峰, 常世强
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Methods in Ecology and Evolution, Volume 17, Issue 4, Page 1143-1160, April 2026.Abstract DNA barcode‐based species identification has become pivotal in biodiversity research. Current barcoding‐based deep learning methods have advantages in species identification but exhibit significant limitations. By using COI barcoding alone, previous studies were unable to fully capture species identification features. Prior methods showed that
Bin Ye +4 more
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Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Measuring area‐based conservation outcomes in tropical forests is challenging due to cryptic human disturbances (e.g., hunting). As a result, comparative studies of management strategies providing quantitative outcomes remain scarce, especially in the Neotropics.
Lucy Perera‐Romero +5 more
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Food and Energy Security, Volume 15, Issue 2, March/April 2026.ABSTRACT Net photosynthetic rate (Pn) serves as a key indicator for evaluating plant growth and yield. In order to explore an effective method for monitoring winter rapeseed Pn using unmanned aerial vehicle (UAV) multispectral technology, the winter rapeseed was taken as the research object and the multispectral images were obtained through UAVs in ...
ChengYang Ni +7 more
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Study on aseismic and shock absorption of folded plate latticed shell(折板式网壳结构的抗震及减震研究)
Zhejiang Daxue xuebao. Lixue ban, 2002 采用振型分解反应谱法对折板式网壳结构的动内力作了分析,计算了结构厚度、坡度等参数对动内力的影响,另外对用振型分解反应谱法和时程分析法计算的结构动内力作了比较.最后,探讨了采用粘弹性支座对四肢腿折板式网壳结构的减震效果.
GAOBo-qing(高博青) +1 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Developing Cu‐based composites that simultaneously achieve ultra‐high strength, ductility, and electrical conductivity remains critical for advanced electrical contact applications. In this work, multiphase AlCrCuFeNi2.5 high‐entropy alloy (HEA) reinforcements are incorporated into CuCrZr matrix via spark plasma sintering (SPS) and annealing ...
Tao Hong +8 more
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Risk, Hazards &Crisis in Public Policy, Volume 17, Issue 1, March 2026.ABSTRACT Hybrid crisis governance – combining hierarchical control with networked collaboration – has gained increasing attention in the public policy and crisis management literatures. Yet, the concept of hybridity remains crude and underdefined, limiting its analytical utility.
Svante Aasbjerg Thygesen +2 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2011 在正放四角锥网架结构抗火性能研究的基础上,进一步分析了两向正交正放网架、斜放四角锥网架和正放抽空四角锥网架在大空间建筑火灾中的热力耦合反应。基于有限元程序ANSYS建立了网架结构上弦压杆应力比一致的结构分析模型,按温度增量加载的方法,对不同支座布置、温度场及荷载条件下的网架结构全过程反应进行了分析。结果表明,温度场非均匀性是导致网架结构杆件相互约束的主要因素,随着温度场非均匀性系数η的减小,各型网架结构的临界温度呈下降的趋势;在相同的温度场和支座布置条件下,随着荷载比的减小各型网架结构临界温度呈升高趋势;
蒋舒, 杜咏, 胡夏闽
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Disaster Cross‐Sector Collaboration Networks: Evidence from Four Historical Disasters
Risk, Hazards &Crisis in Public Policy, Volume 17, Issue 1, March 2026.ABSTRACT By conducting content analysis and social network analysis of media coverage of four historical disasters (i.e., the 2011 Joplin Tornado, 2013 Moore Tornado, 2017 Hurricane Harvey, and the 2023 Maui wildfire), this study uncovered characteristics of cross‐sector disaster collaboration networks.
Xiaochen Angela Zhang, Jonathan Borden
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Jianzhu Gangjiegou Jinzhan, 2010 针对5种典型单层球面网壳结构型式（联方型、施威德勒型、凯威特型、三向格子型和短程线型）,本文采用基于离散变量的序列两级截面优化算法对一百个不同跨度（30m60m）、不同矢高（1/31/7）的网壳进行截面优化设计,在截面优化设计结果中提取选型所需的优秀样本,一个优秀样本由3部分组成:跨度,矢跨比和该跨度、矢跨比下用钢量最少的网壳结构类型;然后利用BP人工神经网络对复杂非线性映射关系的模拟能力建立网壳跨度、矢跨比与用钢量最少的网壳型式之间的映射关系,避免了结构选型优化的多维、多重非线性模型的求解困难 ...
陈世英, 郭玉霞, 鹿晓阳
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