Results 41 to 50 of about 15,595 (167)
DIAGNOSIS of FLOW CONTROL VALVE USING WAVELET PACKET [PDF]
, 2011 提出了一种利用小波包检测调速阀故障信号的方法。通过小波的小波包分析将信号按一定的尺度进行划分,不同频率的信号被划分到不同的频段中。由经过预处理的信号经过小波包分解与重构后,可以得到小波包重构图,由图中可以获得故障产生的时间点和频率,再对故障的严重程度进行了量化分析。实验结果表明用小波包理论进行故障检测是可行的。We propose the method of flow control valve fault diagnosis employing wavelet packet analysis.We ...
吴为民, 吴文兵
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Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 1, Page 27-33, January 2026.ABSTRACT Objective To assess the effectiveness of the first‐trimester anomaly scan (FTAS) performed as part of a centrally steered national screening program in The Netherlands by investigating false‐negative cases with a fetal structural anomaly that was not detected at the FTAS.
K. Bronsgeest +18 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2019 对民族服饰图案进行自动分割以提取图案纹样元素，是民族服饰图案素材库构建急需解决的难题。通过融合形态学连通域标记和CV 模型（MCC-CV），提出了一种民族服饰图案自动分割方法，首先对民族服饰图案进行预处理，然后采用形态学连通域标记算法获得待分割目标的位置和大致轮廓信息，对CV 模型进行初始化，最后通过CV 模型对不同分割目标进行边缘追踪，以实现民族服饰图案纹样元素的自动分割。实验表明，融合形态学连通域和CV 模型的民族服饰图案纹样元素自动分割方法在边界召回率（BR） 为0.5 时，分割准确率为 60 ...
HOUXiaogang(侯小刚) +2 more
doaj +1 more source
The Genome of Phoebe zhennan (Lauraceae) and Comparative Genomics of Phoebe 楠木(樟科)基因组与楠属植物比较基因组学研究
Integrative Conservation, Volume 4, Issue 4, Page 584-599, December 2025.Phoebe zhennan is a Chinese endemic and valuable timber species of Phoebe (Lauraceae). We present a chromosome‐level genome assembly of P. zhennan. Our research provides novel insights into the genome evolution of Phoebe, including whole‐genome duplication, phylogenetic relationships of magnoliids, and key MYB regulatory genes involved in lignin ...
Mao Yameng +3 more
wiley +1 more source
Remote Sensing Image Enhancement Based on Orthogonal Wavelet Transformation and Pseudo-color Image Processing [PDF]
, 2010 针对基于正交小波分析的图像增强技术一般只适用于黑白图像;而伪彩色处理技术不能够充分处理图像中某些细节信息的缺陷,提出了基于正交小波分析和伪彩色的遥感图像增强处理方法;实验结果表明,增强后的遥感图像无论在视觉效果上还是在噪声特性上都有了很大的改善;该方法简便易行且计算量小,在应用中有较大的灵活性;该方法还具有运算速度快和可操作性强等特点,在遥感图像增强研究方面具有广泛的应用前景。Image enhancement technique based on wavelet analysis is only ...
刘美珍, 周健, 李绍滋, 王智文
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Poverty &Public Policy, Volume 17, Issue 4, December 2025.ABSTRACT With most unemployed youth residing in rural areas of South Africa, incentivising youth participation in smallholder farming can help address the increasing youth unemployment crisis. The study integrated the theory of planned behavior and the sustainable livelihood framework to investigate the factors influencing rural youth participation in ...
Humbulani Portia Rambuda +2 more
wiley +1 more source
Relization of Malti-Doc/Malti-View in GIS based on MFC(一种基于MFC的GIS多文档多视图技术实现)
Zhejiang Daxue xuebao. Lixue ban, 2005 针对GIS中数据分析与管理的多图层需要，在深入研究MFC类库框架结构、分析Windows应用程序开发流程的基础上提出了一种基于MFC的多文档多视图框架结构的解决方案，该方案不仅与MFC有着良好的继承、扩展和兼容性，可以快速地实现应用程序开发，而且又很好地实现了 GIS中图层管理的多文档多视图特点，满足了多源数据分析与管理的要求，实践表明这是一种可行的技术方案，
GUOXian-jie(郭宪杰) +3 more
doaj +1 more source
Pure ti-based mixed oxides prepared from the thermal decompositions of molecular precursors of peroxo complexes coordinated with tris(hydroxycarbonylmethyl)amine trivalent anion titanate(IV) [PDF]
, 2004 Different peroxo titanate (IV) complexes coordinated with tris(hydroxycarbonylmethyl) amine trivalent anion including ammonium, potassium, strontium and barium salts (NH4)(4)[Ti2O(O-2)(2)(ta)(2)]-4H(2)0 (1), K-4[Ti2O(O-2)(2)(ta)(2)]-6H(2)O (2), Sr-2[Ti2O(
DENG, Yuan-Fu +5 more
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Evaluating protected areas’ coverage of threats to terrestrial biodiversity
Conservation Biology, Volume 39, Issue 6, December 2025.Abstract Protected areas (PAs) are vital for biodiversity conservation and have expanded globally. However, increasing pressures on biodiversity make it difficult to achieve conservation goals. Using threat probability maps based on the International Union for Conservation of Nature Red List and the World Database of Protected Areas, we analyzed the ...
Katherine Pulido‐Chadid +2 more
wiley +1 more source