研究了顺序资源共享分配系统的建模模型S4PR(Systems of sequential systems with shared resources)网的活性问题.已有的研究成果表明,一个S4PR网在所有信标都满足max,max或max-controlled时能保持活性,但现有的活性条件对信标的限制...研究了顺序资源共享分配系统的建模模型S4PR(Systems of sequential systems with shared resources)网的活性问题.已有的研究成果表明,一个S4PR网在所有信标都满足max,max或max-controlled时能保持活性,但现有的活性条件对信标的限制严格且不适用于某些网系统,本文提出了一类名为max*-controlled的改进型条件,并证明了当一个S4PR网的所有信标都满足max*-controlled条件时,网系统能保持活性.与现有的其他条件相比,新的活性条件更加宽松,为设计更高允许度的死锁预防或者活性保持监控器提供了理论支撑.展开更多
The preparation of activated carbon from Chinese fir sawdust by zinc chloride activation under both nitrogen atmosphere and vacuum conditions was carded out in a self-manufactured vacuum pyrolysis reactor. The effects...The preparation of activated carbon from Chinese fir sawdust by zinc chloride activation under both nitrogen atmosphere and vacuum conditions was carded out in a self-manufactured vacuum pyrolysis reactor. The effects of the system pressure and the activation condition （nitrogen or vacuum） on pore development were investigated. The results show that both high quality activated carbon and high added-value bio-oil can be obtained simultaneously via vacuum chemical activation. The characteristics of the activated carbons produced under vacuum conditions are better than those prepared under nitrogen atmosphere. The performance parameters of the activated carbon obtained under vacuum conditions are as follows： the pore size distribution is mainly microporous, the Brunauer-Emmett-Teller （BET） surface area is 1 070.59 m^2/g, the microporous volume is 0.502 4 cm^3/g, the average pore size is 2.085 nm, and the iodine adsorption value and the methylene blue adsorption value are 1 142.92 and 131.34 mg/g, respectively. The activated carbon from vacuum chemical activation has developed micropores, and the N2 adsorption equilibrium constant of the corresponding activated carbon gradually increases with the decrease of reaction system pressure.展开更多
The technology that waste activated carbon after extracting gold is regenerated with steam under microwave heating was studied. The influence of the activation temperature, activation duration and steam flow rate on i...The technology that waste activated carbon after extracting gold is regenerated with steam under microwave heating was studied. The influence of the activation temperature, activation duration and steam flow rate on iodine adsorption value and regeneration yield of activated carbon was investigated. The response surface methodology （RSM） technique was utilized to optimize the process conditions. The optimum conditions for the preparation of activated carbon are identified to be activation temperature of 831 ℃, activation duration of 40 min and steam flow rate of 2.67 mL/min. The optimum conditions result in an activated carbon with an iodine number of 1048 mg/g and a yield of 40%, and the BET surface area evaluated using nitrogen adsorption isotherm is 1493 m2/g, with total pore volume of 1.242 cm3/g. And the pore structure of activated carbon regenerated is mainly composed of micropores and a small amount of mesopores.展开更多
文摘研究了顺序资源共享分配系统的建模模型S4PR(Systems of sequential systems with shared resources)网的活性问题.已有的研究成果表明,一个S4PR网在所有信标都满足max,max或max-controlled时能保持活性,但现有的活性条件对信标的限制严格且不适用于某些网系统,本文提出了一类名为max*-controlled的改进型条件,并证明了当一个S4PR网的所有信标都满足max*-controlled条件时,网系统能保持活性.与现有的其他条件相比,新的活性条件更加宽松,为设计更高允许度的死锁预防或者活性保持监控器提供了理论支撑.
文摘The preparation of activated carbon from Chinese fir sawdust by zinc chloride activation under both nitrogen atmosphere and vacuum conditions was carded out in a self-manufactured vacuum pyrolysis reactor. The effects of the system pressure and the activation condition （nitrogen or vacuum） on pore development were investigated. The results show that both high quality activated carbon and high added-value bio-oil can be obtained simultaneously via vacuum chemical activation. The characteristics of the activated carbons produced under vacuum conditions are better than those prepared under nitrogen atmosphere. The performance parameters of the activated carbon obtained under vacuum conditions are as follows： the pore size distribution is mainly microporous, the Brunauer-Emmett-Teller （BET） surface area is 1 070.59 m^2/g, the microporous volume is 0.502 4 cm^3/g, the average pore size is 2.085 nm, and the iodine adsorption value and the methylene blue adsorption value are 1 142.92 and 131.34 mg/g, respectively. The activated carbon from vacuum chemical activation has developed micropores, and the N2 adsorption equilibrium constant of the corresponding activated carbon gradually increases with the decrease of reaction system pressure.
基金Project(2013AA064003)supported by the National High Technology Research and Development Program of ChinaProject(2012HB008)supported by Young and Middle-aged Academic Technology Leader Backup Talent Cultivation Program in Yunnan Province,China
文摘The technology that waste activated carbon after extracting gold is regenerated with steam under microwave heating was studied. The influence of the activation temperature, activation duration and steam flow rate on iodine adsorption value and regeneration yield of activated carbon was investigated. The response surface methodology （RSM） technique was utilized to optimize the process conditions. The optimum conditions for the preparation of activated carbon are identified to be activation temperature of 831 ℃, activation duration of 40 min and steam flow rate of 2.67 mL/min. The optimum conditions result in an activated carbon with an iodine number of 1048 mg/g and a yield of 40%, and the BET surface area evaluated using nitrogen adsorption isotherm is 1493 m2/g, with total pore volume of 1.242 cm3/g. And the pore structure of activated carbon regenerated is mainly composed of micropores and a small amount of mesopores.
