Results 111 to 120 of about 33,013 (177)

单调荷载作用下Q355冷弯薄壁型钢平板和角部材料延性断裂性能研究

open access: yesJianzhu Gangjiegou Jinzhan
采用试验研究与数值模拟相结合的方法,研究了Q355冷弯薄壁型钢平板和角部材料的延性断裂性能。共完成了58个材料取样试件的单调加载试验,并选取代表性试件开展金相观察。结合精细化有限元模拟,得到了各试件的断裂应变与应力状态。基于数值结果,校准了5种断裂模型的材料参数,包括两参数Rice-Tracey模型(RT2)、三参数Rice-Tracey模型(RT3)、最大剪应力模型(MSS)、CrashFEM(CF)及VNISFM,并编写Usdfld子程序完成模型验证。结果表明:狗骨试件的断裂应变随冷弯程度增大而增大,
张汉文, 任重, 戴柳丝, 闫伸
doaj  

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

[Exploration of Different Methods for Constructing Animal Models of Melasma in Plateau Regions]. [PDF]

open access: yesSichuan Da Xue Xue Bao Yi Xue Ban
Danzengdeqiong   +8 more
europepmc   +1 more source

Governing Cybersecurity in the Digital Age: Mapping Comprehensive Policy Mixes With the Nodality‐Authority‐Treasure‐Organization Lens

open access: yesReview of Policy Research, Volume 43, Issue 4, July 2026.
ABSTRACT The accelerated digitalisation of society has amplified cybersecurity threats and revealed their cross‐sectoral nature. Yet, the policy instruments used to address these challenges remain insufficiently examined. This study conducts a scoping review of 980 academic articles (2007–2024) and applies Hood's NATO framework (Nodality, Authority ...
Benedetta Cotta, Maria Stella Righettini
wiley   +1 more source

基于留一交叉验证法的支持向量机负荷建模参数辨识方法

open access: yesGaoya dianqi
负荷建模在电力系统的运行和控制方面扮演着至关重要的角色,找到一种有效、可靠的负荷建模参数辨识优化方法具有重要的实际意义。文中利用支持向量机(support vector machine,SVM)方法对电力系统负荷进行建模研究,通过高斯径向基函数作为核函数,选择支持向量机模型的基础结构。在模型辨识过程中,以PMU实测电流、电压以及相角数据作为输入变量,以有功功率和无功功率作为输出变量。基于测量的负荷建模方法使用留一交叉验证法(leave-one-out cross-validation,LOOCV ...
邢超, 王朋林, 何鑫, 邓灿
doaj  

[Research on a muscle fatigue quantification based on an improved critical power model]. [PDF]

open access: yesSheng Wu Yi Xue Gong Cheng Xue Za Zhi
Wu X, Shang J, Niu X, Lin H, Du Y.
europepmc   +1 more source

[A Transformer-based model using laboratory indicators efficiently differentiates ovarian cancer]. [PDF]

open access: yesNan Fang Yi Ke Da Xue Xue Bao
Tan S   +6 more
europepmc   +1 more source

[Establishment and evaluation of rat and mouse models with addictive behaviors]. [PDF]

open access: yesZhong Nan Da Xue Xue Bao Yi Xue Ban
Lu M, An B, Ding Q, Zhang X.
europepmc   +1 more source

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