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Wenhan Song,Shuzhong Wang,Donghai Xu,Yang Guo,Chuang Yang,Jiandong Zhang,Yanhui Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
Hydrothermal liquefaction (HTL) of seven algae was conducted at both 280 and 350 oC with a reaction time of 30min and a mass ratio of 1/4 of algae to water to evaluate the utilization potential of bio-oil production and nutrient recycling in the aqueous by-product and solid residue particles. Chlorella and Nannochloropsis sp. exhibited the highest bio-oil yields at 280 oC (36.5% from Nannochloropsis sp.) and 350 oC (38.1% from Chlorella). Additionally, temperature had little effect on the energy recovery from Chlorella, Nannochloropsis sp., Spirulina, Cyanophyta and Euglena. The carbohydrates and lipids in the algae were primarily related to monoaromatic and single-ring heterocyclic compound generation in bio-oil. In addition, carbohydrates and proteins significantly affected oxygenated compound production. The sizable total carbon, ammonia nitrogen, total nitrogen and phosphate contents in the aqueous byproducts showed great potential as nutrient sources for algal cultivation and the production of value-added chemicals through recycling. Higher temperatures increased the percentage of ammonia nitrogen in the total nitrogen and reduced the phosphate concentration in the aqueous by-product. According to potential evaluation factors, Chlorella, Nannochloropsis sp., Spirulina, Cyanophyta and Euglena totally showed higher potential in terms of bio-oil production and aqueous nutrient recycling than Dunaliella salina and Enteromorpha prolifera, in which Nannochloropsis sp. exhibited the greatest utilization potential at investigated conditions.
Leipo Liu,Xiangyang Cao,Zhumu Fu,Shuzhong Song,Hao Xing 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
This paper is concerned with the input-output finite-time control of uncertain positive impulsive switched systems(UPISS) with time-varying and distributed delays. Firstly, the definition of input-output finite-time stability is extended to UPISS, and the proof of the positivity of UPISS is also given. Then, by constructing multiple linear copositive Lyapunov functions and using the mode-dependent average dwell time(MDADT) approach, a state feedback controller is designed, and sufficient conditions are derived to guarantee that the corresponding closedloop system is input-output finite-time stable(IO-FTS). Such conditions can be easily solved by linear programming. Finally, two examples are given to demonstrate the effectiveness of the proposed method.
Asynchronously Input-output Finite-time Control of Positive Impulsive Switched Systems
Leipo Liu,Hao Xing,Yifan Di,Zhumu Fu,Shuzhong Song 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.7
This paper considers asynchronously input-output finite-time control of positive impulsive switched systems(PISS). Firstly, the definition of input-output finite-time stability(IO-FTS) is introduced. By using the Lyapunov functional and average dwell time(ADT) approach, a state feedback controller is designed and new sufficient conditions are obtained to guarantee the corresponding closed-loop system is IO-FTS under asynchronous switching. Such conditions can be solved by linear programming. Finally, a practical example is provided to show the effectiveness of the proposed method.