Results 11 to 20 of about 14,312 (131)
Classifier of silicon content in hot metal based on support vector machines(基于支持向量机的高炉铁水硅含量多类别分类)
Zhejiang Daxue xuebao. Lixue ban, 2007 支持向量机是基于统计学习理论发展而来的一种机器学习算法，本文介绍了非线性软间隔分类机、最小二乘分类机和加权最小二乘分类机的算法.以山东莱钢1号高炉在线采集数据作为应用案例，使用C-均值算法对[Si]做聚类分析将其分成5类，改进M-ary分类方法实现对铁水硅质量分数[Si]的多类别分类，并对各分类机的性能作出评价.
JIANLing(渐令) +2 more
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Jianzhu Gangjiegou Jinzhan, 2023 基于支持向量机的结构损伤识别方法建立在训练和测试数据同概率分布的假设上，必须对每个结构分别收集训练数据和标签并训练模型以识别损伤。损伤结构的训练数据和标签难以收集，导致支持向量机方法在结构损伤识别中难以实施。提出一种基于领域自适应支持向量机的跨域损伤识别方法，将在有损伤标签结构（源结构）上训练的支持向量机推广到无损伤标签结构（目标结构）的损伤识别中。该方法首先提取结构的多阶固有频率变化率作为损伤特征构建训练数据；然后，推导最小化边缘分布差异与最小化联合分布差异的迁移学习方法 ...
李佐强 +6 more
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Soil Quality Assessment of Five Typical Forest Stands in the Dianchi Lake Basin based on MDS [PDF]
[Objective] Soil quality is a critical indicator of ecosystem health and sustainable land management. [Methods] Key soil quality indicators (e.g., organic matter, total nitrogen, available nitrogen, capillary porosity, and pH) were identified through ...
HUANG Shuai +4 more
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Gaoya dianqi, 2020 针对真空断路器的可靠性研究问题,对12 kV永磁操动式真空断路器做了寿命试验。将采集到的试验数据用Weibull变换进行预处理,变换后的数据在普通坐标系内接近于直线,基于图形法可接受二参数Weibull分布作为拟合模型;采用最小二乘法计算确定了Weibull分布模型的具体参数;最后,在小样本试验数据的情况下,采用针对Weibull分布的Mann检验方法进行模型检验。结果表明,真空断路器的寿命数据符合二参数Weibull分布模型,并计算得到了模型的可靠性评价指标和真空断路器的平均寿命。
穆艳 +4 more
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Evaluation of the Effectiveness of Soil Improvement Measures in Apple Orchards on the Loess Plateau: A Meta-Analysis [PDF]
[Objective] Soil acidification, structure and fertility degradation and poor water-holding capacities are common problems in the apple orchard on the Loess Plateau, effective soil improvement techniques are crucial for enhancing soil quality, and ...
DUAN Shunxia +3 more
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Soil Preferential Flow Characteristics in Coal Mine Subsidence Area under Different Rainfall Duration [PDF]
[Objective] Research on the preferential flow characteristics triggered by cracks in coal mining subsidence areas can provide support for scientific and rational development of water resource management and ecological management practice in the mining ...
DAI Bin +4 more
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Extent of threats to marine fish from the online aquarium trade in the United States
Conservation Biology, Volume 40, Issue 1, February 2026.The global marine aquarium hobby is a multibillion‐dollar industry, largely driven by demand from the United States. Much of this trade occurs online. We web scraped 4 major US‐based e‐commerce platforms selling marine aquarium fish to determine the retail price and source (wild capture, aquaculture, or both) of 13 families of ray‐finned marine fish ...
Bing Lin +6 more
wiley +1 more source
International Journal of Applied Linguistics, Volume 36, Issue 1, Page 652-666, February 2026.ABSTRACT Given the importance of the linguistic landscape in language learning, the digital linguistic landscape (DLL) has emerged as an important multimodal input resource. However, few studies have been conducted to explore the antecedent and predictive effect of the DDL on L2 writing. To address this gap, the study attempted to conceptualize the DLL
Zi Yang, Lawrence Jun Zhang
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Gaoya dianqi, 2023 针对输电线路巡检的复杂场景下被遮挡以及目标较小导致的误检问题，文中提出了一种基于YOLOv5的改进算法模型。首先通过数据增强和数据扩充数据集进行预处理；其次给引入SE模块，加强对不同尺度下目标的特征融合；然后引入CBAM模块，进行进一步特征提取，使提取的特征信息更加突出。最后，对损失函数进行优化，改进小数据导致的样本不均衡现象。经实验证明，改进后的算法有效地提高了被遮挡的目标和小目标的识别率，mAP较原算法精度提高了5%,Recall提高了14.6%。与其他改进模型相比，精度、召回率都有提高 ...
游越, 伊力哈木·亚尔买买提
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