Results 31 to 40 of about 12,453 (164)

Application of Complex Three-Order Cumulants to Fault Diagnosis of Hydraulic Valve [PDF]

open access: yes, 2013
为了提高故障诊断正确率,提出了一种基于复数三阶累积量的机械故障诊断方法.三阶累积量的不同定义的复数形式包含了信号间不同的耦合信息,利用这些信息进行了故障诊断.在溢流阀故障诊断实验中,利用这些不同的耦合信息,通过二维小波在不同的方向上对故障信号和正常信号进行特征提取,然后将这些特征值输入支持向量机进行故障判别.实验结果表明,上述方法可以提高故障诊断正确率.同时还对实数三阶累积量也进行了相同的实验,这些实验所取得的诊断效果证明了采用本文方法的有效性.In order to improve the ...
吴文兵, 周桃庚, 杨淑群
core  

Dissolution‐Controlled Phase Separation of Cs+/Rb+ in High‐Salinity Brines via All‐Inorganic Prussian Blue Analogs

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT The similar physicochemical properties of alkali metal elements make the co‐enrichment and precise separation of Cs+ and Rb+ in complex brine systems highly challenging. Here, an all‐inorganic strategy is proposed, which achieves efficient enrichment and precise separation of Cs+ and Rb+ in high‐salt systems by constructing Sr2+/Ba2+‐based ...
Kang Li, Ruixin Ma, Shina Li
wiley   +1 more source

高压断路器分合闸线圈电流信号特征提取与故障判别方法研究

open access: yesGaoya dianqi, 2015
高压断路器分合闸线圈电流信号特征提取在故障识别、检测及诊断方面都有重要的意义。文中提出采用小波分析与时域求极值点相结合的方法来获取高压断路器分合闸线圈电流信号特征值,并根据该特征值对断路器的故障判别方法做了探索性研究。实验结果表明,电流信号特征值提取方法是有效的,故障识别方法正确。
孙银山   +4 more
doaj  

浅谈三种分类方法的优劣 [PDF]

open access: yes, 2013
本文针对DNA序列的分类问题,通过使用SPSS和Matlab软件,运用Fisher判别法、BP人工神经网络模型和支持向量机方法,由已知AB类样本分别对未知类型的20个DNA序列进行分类,并通过三个统计分类方法的结果同时综合考虑误差及原理分析对三个统计分类方法进行比较 ...
俞童慧, 杨旷怡, 王馨敏
core  

The Role of Uncertainty in the Policy Process: An Extension to the Multiple Streams Framework

open access: yesReview of Policy Research, Volume 43, Issue 1, January 2026.
ABSTRACT A core assumption of the Multiple Streams Framework proposes that agenda and policy change is more probable when a policy proposal worked out as a viable alternative in the policy stream is coupled with the political and/or problem stream in an open policy window.
Sebastian Hemesath, Georg Wenzelburger
wiley   +1 more source

冷链物流企业采纳产业园区金融服务研究 [PDF]

open access: yes, 2019
: 冷链物流主要是指食品在生产到消费者食用前始终处于适宜的温度环境,以保障食品品质、降低流通过程中的损耗。冷链物流相比于传统物流而言是一项更复杂的系统性工程,受到政策和市场需求的影响呈现迅猛发展态势。但是,冷链物流企业长期以来因规模小、固定资产少、服务范围窄、服务规范性弱而发展困难重重,核心问题是资金的问题。政府引导和鼓励打造冷链物流产业园,推动产业园投资和建设主体打造平台,实现对园区内冷链企业的聚集效应并通过金融服务解决企业发展的资金问题。通过产融结合助力冷链物流企业发展 ...

core  

Strategies in Ericaceae to acquire phosphorus in phosphorus‐impoverished habitats in the southwest Australian biodiversity hotspot

open access: yesFunctional Ecology, Volume 39, Issue 10, Page 2889-2904, October 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract In the Southwest Australian Biodiversity Hotspot, the greatest plant species diversity tends to occur on the most phosphorus (P)‐impoverished soils. Many plant species in this P‐impoverished environment release root carboxylates that mobilise soil P which is a more ...
Xue Meng Zhou   +5 more
wiley   +1 more source

基于生成对抗网络的多特征融合去雾技术

open access: yes大数据
为提高图像清晰度,解决传统图像在去雾过程中存在的特征提取困难、去雾不彻底等问题,提出一种基于生成对抗网络的多特征融合端到端去雾网络。该网络由生成器和判别器组成,生成器采用编解码结构,通过多特征提取融合(MFEF)块提取多种感受野下的高维表征信息。判别器使用一系列卷积计算对生成图像和清晰图像进行特征差异分析,引导生成器输出更加真实的去雾图像。实验结果表明,该算法在有效消除雾霾干扰的同时,能够最大限度地保留图像的原始色调。与现有方法相比,该算法在峰值信噪比、结构相似性客观评价指标上分别提升了2.588 dB、
司亚中, 张旭龙, 杨帆, 王健宗, 程宁, 肖京
doaj   +1 more source

农民增收:地权稳定抑或土地流转?——基于对漳浦县农地细碎化和农业投入的产出弹性分析 [PDF]

open access: yes, 2012
本文根据对漳浦县的调研计量分析了农地细碎化对农业产出的影响。研究发现,不同于传统认识,一定程度的农地细碎化对南方沿海地区农民收入反而有正向影响。其原因在于我国现有的加工贸易型工业化、滚动型城市化使农民的非农化采取了特殊的形式。现有的工业化、城市化模式并没有形成农业土地规模经营的必要前提,因此,要推进农村土地流转,农地规模经营,必须从调整现有的工业化、城市化模式入手。目前情况下,加强农村地权稳定性,尊重农民在农村土地流转中的自主权,对于维护农民基本利益具有重要作用,与此同时 ...
卢盛荣, 易明子, 李文溥
core  

Construction of Quality Evaluation Systems for Coffee Beans and Their Application to Chinese Coffee Beans [PDF]

open access: yes
In order to explore quality evaluation methods for Chinese coffee beans for freshly ground coffee and instant coffee and to select evaluation indicators, the major quality indicators were selected from the basic quality indicators through the Delphi ...
ZHAO Xi, MIAO Yue, JI Shengyang, YAN Lin, LI Ye, ZHANG Fang, GONG Jiashun, LU Baiyi
core   +1 more source

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