Considering the temperature difference of displacement cooking characterized by severe non-linearity, large time delay, and real-time control, a cascade PID adaptive control strategy composed of a single neuron is pro...Considering the temperature difference of displacement cooking characterized by severe non-linearity, large time delay, and real-time control, a cascade PID adaptive control strategy composed of a single neuron is proposed to ensure cooking temperature uniformity. The control strategy introduces expert experiences to adjust the single neuron gain K, while a single neuron PID self-learning and adaptive ability, as well as cascade advantage can be combined to realize the real-time and fast temperature difference control. In the Simulink, the s-function of this control strategy is used to carry out a dynamic simulation experiment with temperature difference characteristics and verify the robustness and response to model mismatch. Compared to conventional temperature difference-flow PID cascade control and single neuron PID cascade control, this control strategy has better robustness and stronger adaptability. The results of real-time control on the THJSK-1 experiment platform indicate this control strategy is feasible.展开更多
Basil(Ocimum basilicum),an edible and medicinal plant with high nutritional value and therapeutic efficacy,was used as a potential source of total flavonoids in this study.Heat reflux extractions were performed using ...Basil(Ocimum basilicum),an edible and medicinal plant with high nutritional value and therapeutic efficacy,was used as a potential source of total flavonoids in this study.Heat reflux extractions were performed using aqueous ethanol.The optimized extraction conditions of total flavonoids from O.basilicum were determined by Box-Behnken design with response surface methodology.Response surface plots showed that the optional four independent variables significantly influenced the extraction yield of total flavonoids.The extraction parameters for the highest total flavonoids yield were optimized as:extraction temperature of 79.74℃,ethanol concentration of 77.63%,ratio of liquid to material of 29.72:1(mL/g),and extraction time of 2.06 h.The average yield of total flavonoids under above optimum parameters was 42.61 mg of rutin equivalents per g of extract dry matter,which was in good agreement with the predicted value of 40.23 mg/g.These optimized conditions could be useful for the extraction of flavonoids from O.basilicum.展开更多
文摘Considering the temperature difference of displacement cooking characterized by severe non-linearity, large time delay, and real-time control, a cascade PID adaptive control strategy composed of a single neuron is proposed to ensure cooking temperature uniformity. The control strategy introduces expert experiences to adjust the single neuron gain K, while a single neuron PID self-learning and adaptive ability, as well as cascade advantage can be combined to realize the real-time and fast temperature difference control. In the Simulink, the s-function of this control strategy is used to carry out a dynamic simulation experiment with temperature difference characteristics and verify the robustness and response to model mismatch. Compared to conventional temperature difference-flow PID cascade control and single neuron PID cascade control, this control strategy has better robustness and stronger adaptability. The results of real-time control on the THJSK-1 experiment platform indicate this control strategy is feasible.
基金This project was financially supported by National Natural Science Foundation of China(31260400)the foundations of Jiangsu Province Biomass Energy and Materials Laboratory in Institute of Chemical Industry of Forest Products,CAF(JSBEM201601)+2 种基金State Key Laboratory of Pulp&Paper Engineering(201611,201503)Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology,Nanjing Forestry University(201531)P.R.China,Natural Science Foundation of Tianjin City(16JCQNJC05900)for financial support。
文摘Basil(Ocimum basilicum),an edible and medicinal plant with high nutritional value and therapeutic efficacy,was used as a potential source of total flavonoids in this study.Heat reflux extractions were performed using aqueous ethanol.The optimized extraction conditions of total flavonoids from O.basilicum were determined by Box-Behnken design with response surface methodology.Response surface plots showed that the optional four independent variables significantly influenced the extraction yield of total flavonoids.The extraction parameters for the highest total flavonoids yield were optimized as:extraction temperature of 79.74℃,ethanol concentration of 77.63%,ratio of liquid to material of 29.72:1(mL/g),and extraction time of 2.06 h.The average yield of total flavonoids under above optimum parameters was 42.61 mg of rutin equivalents per g of extract dry matter,which was in good agreement with the predicted value of 40.23 mg/g.These optimized conditions could be useful for the extraction of flavonoids from O.basilicum.
