In this paper, we are concerned with output feedback stabilization for a one-dimensional anti-stable wave equation with disturbance. First, we design a disturbance estimator for the original system. Then, we propose a...In this paper, we are concerned with output feedback stabilization for a one-dimensional anti-stable wave equation with disturbance. First, we design a disturbance estimator for the original system. Then, we propose an output feedback controller for the original system. By calculation, the closed-loop of original system is proved to be exponentially stable and well-posed. Finally, this paper is summarized.展开更多
This paper has studied the output feedback regulation problem for 1-D anti-stable wave equation with distributed disturbance and a given reference signal generated by a finite-dimensional exosystem. We first design an...This paper has studied the output feedback regulation problem for 1-D anti-stable wave equation with distributed disturbance and a given reference signal generated by a finite-dimensional exosystem. We first design an observer for both exosystem and auxiliary PDE system to recover the state. Then we show the well-posedness of the regulator equations and propose an observer-based feedback control law to regulate the tracking error to zero exponentially and keep all the states bounded.展开更多
The effect of Tremella fuciformis polysaccharide(TFP)on the retrogradation property and aroma profile changes of tteok during storage was investigated.Results indicated that addition of TFP significantly increased the...The effect of Tremella fuciformis polysaccharide(TFP)on the retrogradation property and aroma profile changes of tteok during storage was investigated.Results indicated that addition of TFP significantly increased the stability to thermal and mechanical shearing of starch,decreased short-term retrogradation,the hardness and the retrogradation enthalpy(ΔH)of tteok during storage,but had no significant effect on the amylopectin chain length of tteok.The possible mechanism for the retarding staling effect of TFP is related to the interaction between TFP and starch chains that interferes with the alignment of starch chains.Electronic nose and g as chromatography-mass spectrum(GC-MS)analysis results showed that the difference in the concentrations of volatile compounds and fatty acids of tteoks at different storage time gradually increased with the advancement of storage period.The addition of TFP to tteok inhibited the development of unpleasant volatile compounds,probably by delaying the oxidation and decomposition of lipids and preserving the antioxidant phenolic compounds in tteok,thus slowing down the flavor deterioration of tteok and contributing to flavor maintainace.Overall,this study could help food manufacturers to choose a high-effective and natural polysaccharide to control the retrogradation rate and flavor loss of tteok.展开更多
常规的窃电检测方法大多数采用卷积神经网络-长短期记忆(Convolutional Neural Networks-Long Short Term Memory,CNN-LSTM)混合模型原理设计而成,在反间歇性窃电检测工作中,检测准确性与时效性均存在不足。基于此,引入载波通信技术,开...常规的窃电检测方法大多数采用卷积神经网络-长短期记忆(Convolutional Neural Networks-Long Short Term Memory,CNN-LSTM)混合模型原理设计而成,在反间歇性窃电检测工作中,检测准确性与时效性均存在不足。基于此,引入载波通信技术,开展了基于载波通信技术的反间歇性窃电检测方法研究。首先,构建异常用电检测模型,采集并挖掘电力负荷数据,获取到不同类型的用户异常用电数据集。其次,降维处理异常用电负荷数据,将高维的数据向量组转化为低维的数据向量组,弱化用电负荷数据相互之间的关系。在此基础上,利用载波通信技术,实时监控用户的用电工况,检测用电工况是否存在异常,进而全方位检测反间歇性窃电行为。分析实验结果可知,按照提出方法监测反间歇性窃电后,检测的平均准确率较高,能够在海量用电用户中快速准确地检测出存在异常的窃电行为。展开更多
文摘In this paper, we are concerned with output feedback stabilization for a one-dimensional anti-stable wave equation with disturbance. First, we design a disturbance estimator for the original system. Then, we propose an output feedback controller for the original system. By calculation, the closed-loop of original system is proved to be exponentially stable and well-posed. Finally, this paper is summarized.
文摘This paper has studied the output feedback regulation problem for 1-D anti-stable wave equation with distributed disturbance and a given reference signal generated by a finite-dimensional exosystem. We first design an observer for both exosystem and auxiliary PDE system to recover the state. Then we show the well-posedness of the regulator equations and propose an observer-based feedback control law to regulate the tracking error to zero exponentially and keep all the states bounded.
基金financially supported by the Key Projects of the National Research and Development Program of China (2018YFD0400103-6)
文摘The effect of Tremella fuciformis polysaccharide(TFP)on the retrogradation property and aroma profile changes of tteok during storage was investigated.Results indicated that addition of TFP significantly increased the stability to thermal and mechanical shearing of starch,decreased short-term retrogradation,the hardness and the retrogradation enthalpy(ΔH)of tteok during storage,but had no significant effect on the amylopectin chain length of tteok.The possible mechanism for the retarding staling effect of TFP is related to the interaction between TFP and starch chains that interferes with the alignment of starch chains.Electronic nose and g as chromatography-mass spectrum(GC-MS)analysis results showed that the difference in the concentrations of volatile compounds and fatty acids of tteoks at different storage time gradually increased with the advancement of storage period.The addition of TFP to tteok inhibited the development of unpleasant volatile compounds,probably by delaying the oxidation and decomposition of lipids and preserving the antioxidant phenolic compounds in tteok,thus slowing down the flavor deterioration of tteok and contributing to flavor maintainace.Overall,this study could help food manufacturers to choose a high-effective and natural polysaccharide to control the retrogradation rate and flavor loss of tteok.
文摘常规的窃电检测方法大多数采用卷积神经网络-长短期记忆(Convolutional Neural Networks-Long Short Term Memory,CNN-LSTM)混合模型原理设计而成,在反间歇性窃电检测工作中,检测准确性与时效性均存在不足。基于此,引入载波通信技术,开展了基于载波通信技术的反间歇性窃电检测方法研究。首先,构建异常用电检测模型,采集并挖掘电力负荷数据,获取到不同类型的用户异常用电数据集。其次,降维处理异常用电负荷数据,将高维的数据向量组转化为低维的数据向量组,弱化用电负荷数据相互之间的关系。在此基础上,利用载波通信技术,实时监控用户的用电工况,检测用电工况是否存在异常,进而全方位检测反间歇性窃电行为。分析实验结果可知,按照提出方法监测反间歇性窃电后,检测的平均准确率较高,能够在海量用电用户中快速准确地检测出存在异常的窃电行为。
