Results 21 to 30 of about 106,323 (223)

IMC-PID Controller Design for Linear Systems with Parametric Uncertainties [PDF]

open access: yes, 2015
控制系统控制品质的好坏直接决定了生产品质和效益,而工业过程控制中 百分之九十以上的控制器仍是PID控制器。于是,PID控制器参数整定一直以 来是工程应用和理论研究的核心问题之一。众多PID整定法中,IMC-PID控制 器参数整定方法脱颖而出,越来越广受工业控制过程的青睐。原因在于,基 于IMC的PID控制器对模型要求较低,甚至在高阶低阶、不稳定或非线性等情 况下,它都能获得有效的控制品质。而且IMC-PID仅有一个整定参数,该参数 调整与系统动态品质和鲁棒性的关系比较明确,从而无需繁杂的整定就可以使 ...
章垚
core  

Conservation Funding at the Local Level 地方层面的保护资金

open access: yesWildlife Letters, EarlyView.
Direct conservation fund transfer to local communities ensures the involvement of these communities in decision‐making and fund utilisation, which will ultimately lead to effective biodiversity conservation. A Cakchiquel family in the hamlet of Patzutzun, Guatemala, 1993. Credits: John Issac. Source: UNEP‐WCMC Internal Resources.
Jithu K Jose
wiley   +1 more source

基于非线性模型的参数估计的验算

open access: yes地矿测绘, 2019
本文首先分析了测量上的函数误差模型,针对常用的非线性模型,研究了其常用的参数估计方法,并采用实例验算,论证了模型参数估计的正确性。
素贞 陈
semanticscholar   +1 more source

Discrete-Time PID Controller Parameters Tuning Based on Minimum Variance Performance [PDF]

open access: yes, 2015
在实际工业过程中,PID控制器仍然是目前应用最广泛的控制器。在实际的控制回路中,超过95%的控制器仍是PID控制器。PID控制器参数整定直接关系到控制系统性能的好坏。目前国内外学者多是在控制对象标称模型下对PID控制器进行优化整定的。然而对于实际工业过程,由于各种扰动、非线性的影响,控制对象参数不确定性是客观存在的,此外实际控制系统还存在各种物的、硬件的约束。而控制系统的方差性能与系统经济效益直接相关。因此 ...
黄少民
core  

Multi‐barcoding‐based species identification using a hierarchical attention network with staged curriculum learning

open access: yesMethods in Ecology and Evolution, EarlyView.
Abstract DNA barcode‐based species identification has become pivotal in biodiversity research. Current barcoding‐based deep learning methods have advantages in species identification but exhibit significant limitations. By using COI barcoding alone, previous studies were unable to fully capture species identification features. Prior methods showed that
Bin Ye   +4 more
wiley   +1 more source

相对局部区域震源参数随机不确定性经验关系研究

open access: yesDizhen xuebao, 2021
在进行未来破坏性地震的强地面运动数值模拟时,震源参数选取的准确性对地震动预测的结果影响很大。震源参数的确定存在很多不确定性因素,既包含随机的不确定性因素,又包含认知的不确定性因素。本文在大量地震事件及文献调研的基础上,运用统计学方法对具备随机不确定性特征的震源参数进行统计研究,以震源参数经验公式的形态建立解释其随机性和不确定性的数学模型。为了研究局部地区震源参数的定标关系特征,获得更加适用于局部地震密集区域,尤其是包含中国大陆地区在内的局部区域的震源参数的经验关系,本文从GCMT地震目录中选取了1 ...
Zongchao Li   +4 more
doaj   +1 more source

管我们是因为爱我们 To Guan Us Is to Love Us: Understanding Guan Through Adolescent Perceptions

open access: yesChildren &Society, EarlyView.
ABSTRACT This paper investigates how children interpret the practice of guan (Chinese parenting) within the home and its relationship to family language policy (FLP). The study involved nine adolescent participants from six families. Using a written reflective task, the study explores the attitudes of adolescents towards the practice of guan and its ...
Angie Baily   +1 more
wiley   +1 more source

Testing the QNSE scheme with the modified coefficients of turbulent mixing length scale: Three summer and autumn coastal gale cases study in China(用调整边界层湍流系数的QNSE方案模拟夏秋季沿海大风的应用研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2018
利用WRF模式,采用YSU、QNSE边界层参数化方案以及调整参数后的QNSE边界层参数化方案(MQNSE),对2009年7月梅雨个例、2015年苏迪罗台风以及2013年10月的近海大风进行了模拟试验,并对模拟结果进行对比检验,着重检验参数调整后的QNSE方案模拟沿海大风效果.研究结果如下:参数调整后的QNSE 边界层参数化方法改进了对沿海风场的模拟效果,尤其是当风速小幅脉动时,参数调整后的QNSE方案较接近于实况风速的波动.通过登陆台风个例模拟试验和对沿海10个岛屿观测站的490个样本统计检验表明 ...
CHENYouli(陈有利)   +4 more
doaj   +1 more source

Study on Algorithms of Radar Signal Identification and Parameters Estimation [PDF]

open access: yes, 2016
在现代军事电子侦察与电子对抗作战中,通过对截获到的雷达信号进行调制方式识别与参数估计,以识别的结果和具体参数值为依据,按照某种规则和算法及查询信号特征数据库,判断出发射该信号的敌方雷达平台的用途或类型,为我方制定作战预案提供参考,做到先发制敌,取得战场的主动权。 近年来出现的很多雷达信号调制方式识别算法中,神经网络理论与脉内分析算法应用较为广泛,但它们各自都有自己的不足,单一的方法无法满足日益复杂调制方式信号的识别与参数估计需要。本文将神经网络理论与脉内分析相结合应用于雷达信号的调制方式识别和参数估计中,
陈金城
core  

Diagnosing scaling bottlenecks in 10 community conservation initiatives in southern and eastern Africa

open access: yesConservation Biology, EarlyView.
Scaling area‐based conservation, including initiatives led or comanaged by Indigenous Peoples and local communities, is a flagship goal of the Kunming‐Montreal Global Biodiversity Framework. Conservationists often aspire to scale initiatives, but this is rarely achieved in practice. Identifying and addressing factors that limit initiative adoption (i.e.
Thomas Pienkowski   +39 more
wiley   +1 more source

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