Results 51 to 60 of about 13,648 (162)
, 2020 Plant phenomics is under rapid development in recent years, a research field that is progressing towards integration, scalability, multi-perceptivity and high-throughput analysis.
Guohui, Ding +6 more
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Zhongguo shiyan zhenduanxue, 2009 目的探讨结核患者短期化疗所引起的肝损伤情况。方法516例结核患者检测其肝功能以及各型肝炎标志物。结果肝损害的发生率为16.3%,有基础性肝病与无肝炎病史的患者相比较,肝损害的发生率显著增高（χ2=22.73,P0.05）。60岁以上的老人化疗后肝损害的发生率明显高于60岁以下的人群（χ2=6.05 ...
侯远沛 +4 more
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Analytical Model of Eddy-current Coil Impedance Based on Second Order Vector Potential [PDF]
, 2016 涡流线圈作为电磁换能器的重要组成，在各类电磁无损检测中均有广泛应用。涡流线圈的阻抗解析建模，可以为换能器的设计、及涡流检测的正、逆问题求解提供理论指导与参考。 国内外学者针对该问题的研究主要集中在解析模型的改进与创新、缺陷的反演以及解析模型适用性的扩展，包括被测导电体的特性、涡流线圈与被测导电体的相对位置关系及涡流线圈的类型、参数等。 目前，对任意形状涡流线圈的解析建模工作，主要通过忽略线宽降低求解问题的维度，或对具有一定截面的简单线圈进行叠加，并忽略线圈相互叠加时的细节问题 ...
黄一民
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Research Progress on the Application of Hyperspectral Technology for Non-destructive Testing of Grape Quality [PDF]
Grape production is an important part of the agricultural economy, which has economic and widespread social benefits. Monitoring and evaluation of grape berries during growth is an important guarantee for the production of high-quality grape berries ...
WEN Jing, MA Wen, ZHANG Ang, JIN Gang, XU Guoqian
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Gaoya dianqi, 2009 准确提取基波电压和电流信号是检测介质损耗因素的关键。提出了一种新的介质损耗因数检测算法,采用希尔波特-黄变换（HHT）对试品电压和电流信号进行检测,通过经验模态分解法（EMD）提取信号的固有模态函数（IMF）,再进行Hilbert变换,得到各自的瞬时频率,由瞬时频率进行介质损耗因数的准确检测。该算法无需同步采样,可以实时提取测量电压、电流信号的基波成分。仿真结果表明,HHT受采样数据长度、频率跟踪误差的影响较小,在非同步采样的情况下,具有良好的应用特性,能有效提高介质损耗因数检测的准确度。
易琛, 李泽文
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Nondestructive detection of chilled mutton pH value using hyperspectral imaging technique [PDF]
ObjectiveTo detect the pH value of chilled mutton quickly and non-destructively.MethodsVisible/near-infrared hyperspectral (400~1 000 nm) imaging technology was used to collect scattering images on the surface of chilled mutton, and the reflectance ...
JIANG Xinhua +4 more
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Dianci bileiqi, 2013 通过采用劣化绝缘子电场法检测理论分析和对伞裙良好绝缘子和伞裙损坏严重的绝缘子的电场分布情况进行对比试验研究,得出结论:通过试验采用电场法检测手段无法判别绝缘子伞裙损坏造成的现象。
陈智勇, 蒋学军, 李婧
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Dianci bileiqi, 2022 针对现有输电线路无人机巡检使用的目标检测算法速度较慢且模型文件较大的问题,提出了一种改进的YOLOv4目标检测算法。使用轻量型的MobileNetv2网络作为模型的主干特征提取网络,并将模型后续的标准卷积运算变为深度可分离卷积,减少了运算参数。使用K-means聚类得到了9种绝缘子及掉片故障锚框尺寸的先验知识。使用h-swish函数作为模型颈部网络的激活函数,减少了特征反复提取过程的信息损失。通过与主流算法进行实验对比,改进后的算法检测速度可达到10.51 FPS,相较SSD算法快了18.7 ...
党宏社, 薛萌, 郭琴
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A Portable Non-destructive Detector for Kabocha Squash Quality Based on Visible and Near-Infrared Spectroscopy [PDF]
A portable visible and near-infrared (VIS-NIR) spectroscopy-based device with a micro-spectrometer as the core component was built for rapid and non-destructive quality detection of kabocha squash.
WANG Jialong, MA Kun, GAO Peng, ZHU Jinfang, ZHANG Ping, HUANG Fan
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Dianci bileiqi, 1989 介绍了超声波探伤、方波容量筛选等技术在氧化锌阀片生产中无损检测的情况.并将阀片中的缺陷区分为有危害和无危害的两种.试验表明,用超声波可检测出φ0.3mm当量甚至更小的气孔缺陷.该项技术已能投入生产使用.
徐秉雁
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