Results 41 to 50 of about 14,312 (131)
Gaoya dianqi, 2021 变压器油中溶解气体在线监测是对油浸式变压器绝缘状况进行实时监测的有效技术手段。对油中溶解气体在线监测装置进行运行质量评价,对装置选型、供应商评价和保障变压器运行可靠性具有重要意义。现有的变电在线监测装置运行质量评价研究存在数据规模小和评价指标有限等问题。为提高评价水平,文中统计分析了大型数据集中在线监测装置的厂家分布、运行年限分布、数据质量等重要信息,然后建立了油中溶解气体在线监测装置运行质量的模糊层次综合评价模型;最后对数据集进行评价结果分析统计,证明了该评价体系反映各厂家监测装置实际应用情况的准确性。
刘慧鑫 +4 more
doaj
Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 5, Page 635-650, November 2024.ABSTRACT Objectives To reach an international expert consensus on the diagnosis, prognosis and management of fetal lower urinary tract obstruction (LUTO) by means of a Delphi procedure, and to use this to define a core outcome set (COS). Methods A three‐round Delphi procedure was conducted among an international panel of experts in fetal LUTO.
H. J. Mustafa +90 more
wiley +1 more source
Gaoya dianqi, 2020 电力系统中高压断路器普遍采用液压操动机构,其机械寿命是考核断路器可靠性和稳定性的基础,文中提出运用数据驱动方法建立退化过程与特征参量之间的数学映射关系,实现高压断路器液压操动机构的机械寿命预测。基于Hadoop+Spark大数据平台及其生态组件,将采集的数据存储在Hadoop分布式文件系统中,利用Spark运算框架处理数据,结合Spark ML机器学习库中的回归算法,训练模型并进行验证评估,从评估结果来看:文中创建的广义线性回归算法模型的均方根误差为52.96,R-平方系数为0.92 ...
段雄英 +4 more
doaj
Insect Conservation and Diversity, Volume 17, Issue 6, Page 1046-1071, November 2024.We quantified previously unstudied tritrophic gall communities on Fagaceae in Sichuan, China, testing for ‘bottom‐up’ effects of host plant diversity on plant–herbivore and plant–parasitoid interactions. We sampled 176 cynipid gall morphotypes from 23 host plant species, yielding 64 parasitoid morphospecies.
Zhiqiang Fang +18 more
wiley +1 more source
Zhendong Ceshi yu Zhenduan针对密集模态情况下难以有效识别结构阻尼比的问题，提出了一种基于特征系统实现算法（eigensystem realization algorithm，简称ERA）和Gabor最优分解的结构阻尼比识别方法。首先，采用结构自由振动响应，利用特征系统实现算法对结构频率进行识别，得到结构各阶频率的最小差异，并根据Gabor分解的时频分辨率确定Gabor分解的参数取值范围；其次，根据Gabor分解幅值曲线的线性拟合残差标准值，提出基于残差标准值最小化的Gabor形状参数确定原则 ...
doaj +1 more source
Shuitu Baochi Xuebao, 2020 根据渭河流域水文站点分布特征，将流域划分为15个子流域，结合1961—2015年输沙资料和气象站日降雨量资料，采用Mann—Kendall检验、双累积曲线、相关性分析及偏最小二乘回归等方法，定量分析渭河流域输沙时空变化特征及其主控因子。结果表明：渭河流域1961—2015年输沙量呈显著减少趋势，渭河干流咸阳站、北洛河状头站和泾河张家山站年输沙量分别以0.039 0，0.017 4，0.041 4亿t/a的速率减少。15个水文站中，北洛河的张村驿站年输沙量呈显著增加趋势 ...
白云鹏 +5 more
doaj
A practical approach to meeting national obligations for sustainable trade under CITES
Conservation Biology, Volume 38, Issue 5, October 2024.Abstract Reconciling conservation goals with sustainable resource use requires adaptive management strategies. The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) regulates global trade for species listed on Appendix II, partly by requiring member countries (parties) to ensure exports do not damage wild ...
Tanvi Vaidyanathan +3 more
wiley +1 more source
道路头盔和车辆目标检测的最小数据集。完整版可访问地址：https://universe.roboflow.com/helmetdetection-beozr/helmet-detection-wwlwvhttps://universe.roboflow.com/yolov3-zkcgl/daylight ...
Minjie Fang (18456417)
core +1 more source
Conservation Biology, Volume 38, Issue 5, October 2024.Abstract Unsustainable wildlife consumption and illegal wildlife trade (IWT) threaten biodiversity worldwide. Although publicly accessible data sets are increasingly used to generate insights into IWT, little is known about their potential bias. We compared three typical and temporally corresponding data sets (4204 court verdicts, 926 seizure news ...
Sifan Hu +6 more
wiley +1 more source
Integrative Conservation, Volume 3, Issue 2, Page 112-126, June 2024.Integrating data collected by citizen scientists with data from traditional surveys improves our knowledge of reptile species distribution and richness. Data contributed by citizen scientist can inform reptile species abundance and rarity patterns in Brazil.
Lucas Rodriguez Forti +3 more
wiley +1 more source