Results 21 to 30 of about 16,027 (131)
Dizhen xuebao近年来，分布式声波传感技术（DAS）以其低成本、高密度、可实时观测等优势在地震学等多个学科领域迅速发展并得到了广泛应用。光纤作为DAS观测系统中重要的传感元件，其本身结构可直接影响数据采集质量，进而影响数据分析结果；同时光纤的物理特性还会影响野外观测成本和观测难度。然而，如何在地球物理观测中选择合适的光纤依然缺乏定量参考。为此，本文根据地震数据的关键特征定义了一套评价指标，用来定量评估DAS观测数据的质量；然后，针对地表浅埋布设DAS设备和垂直井中布设DAS设备两种主要的地震观测系统，设计了对比试验方案，
Bao Deng +4 more
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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
doaj
Clarity of a Philosophy of Data Analysis During the Age of Big Data [PDF]
, 2014 本文在剖析了国内外大数据研究和应用现状的基础上,提出了“大数据时代“的定义,并从统计学的角度界定了“大数据“概念。同时,根据大数据的特点,本文重新审视了在大数据时代统计研究工作过程及统计思维所面临的挑战,明确了统计工作和统计研究转变的基本思路。This paper sets forth background of the age of big data and proposes the definition of big data based on background of the age of ...
刘晓葳, 朱建平, 章贵军
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International Journal of Applied Linguistics, Volume 35, Issue 4, Page 1897-1911, November 2025.ABSTRACT Despite artificial intelligence (AI) emerging as a key driver of innovation and transformation in language education, how to enhance language teachers’ AI literacy and understand their emotional experiences in AI‐mediated teaching remains largely unexplored.
Xiao Xie +3 more
wiley +1 more source
Pharmacophore model construction of glycogen synthase kinase-3 inhibitors(GSK-3抑制剂药效团模型的构建)
Zhejiang Daxue xuebao. Lixue ban, 2012 选择活性跨越0.08〜100 000 nmol • L-1的8类共30个GSK-3竞争性抑制剂小分子作为训练集，其余490个不同结构和活性的小分子作为测试集.采用Accelrys Discovery Stutio Client 2. 5软件，筛选得到由1个氢键受体、1个氢键供体、1个疏水中心、1个环芳香性和1个排除体积组成的最佳模型（Correl=0. 900，Config=13. 962，Δcost=90.
LÜYang(吕杨) +4 more
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Veterinary Dermatology, Volume 36, Issue 5, Page 552-565, October 2025.Abstract Background Canine pyoderma is one of the most common presentations in small animal practice, frequently leading to antimicrobial prescribing. Objectives To provide clinicians with antimicrobial treatment guidelines for staphylococcal pyoderma, including those involving meticillin‐resistant staphylococci.
Anette Loeffler +9 more
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Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 1, Page 41-50, July 2025.ABSTRACT Objectives Monochorionic diamniotic (MCDA) twins with selective fetal growth restriction (sFGR) and either continuous (cAREDF) or intermittent (iAREDF) absent or reversed end‐diastolic flow in the umbilical artery face significant fetal and neonatal risks.
A. T. R. Noll +19 more
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Environmental racism and air pollution: Pre and post the COVID‐19 economic shutdown
Review of Policy Research, Volume 42, Issue 4, Page 949-981, July 2025.Abstract Decades of research demonstrates that minoritized groups are disproportionately affected by swathes of harmful pollutants, including air pollution, even controlling for low income. Would significantly reducing individual car traffic help reduce the EJ gap?
Heather E. Campbell +3 more
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, 2022 耕地和草地分别约占地球上无冰土地的12%和26%，是地球上占比最大的两种典型土地利用类型之一，也是我国重要的两种农用地类型。维护耕地和草地土壤质量和健康对我国农牧业绿色可持续性发展、推进生态文明建设具有重要意义。长久以来，施肥是保障和提高耕地和草地生产力的主要农艺措施，但目前关于全面体现施肥对土壤质量和健康变化影响的系统性研究还很有限，对于长期施肥后的土壤质量和健康的整体评价、土壤健康变化的原因与后果等方面的研究仍存在不足。本研究分别基于中国科学院鹰潭红壤生态试验站内（位于亚热带江西省内的丘陵旱作耕地 ...
司绍诚
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Integrative Conservation, Volume 4, Issue 2, Page 246-253, June 2025.After the great Chinese poet Qu Yuan (屈原) was exiled to Xupu (溆浦) county in Hu' nan province, he described the forest there as follows: “mysterious is the deep forest, the place where Yuán yòu dwell (深林杳以冥冥兮,乃猿狖之所居).” What is the referent of the name Yuán yòu in this sentence?
Kefeng Niu
wiley +1 more source