The water treatment effect of a protein skimmer with different ozone concentrations for recirculation system of industrial fish farming was studied in this paper.Foam separation principle and ammonia nitrogen removing...The water treatment effect of a protein skimmer with different ozone concentrations for recirculation system of industrial fish farming was studied in this paper.Foam separation principle and ammonia nitrogen removing theory of the protein skimmer was described.A protein skimmer with a discharge of 50 m3·h-1 was designed.The skimmer was used in a recirculation system,and relative water quality parameters: protein,ammonia nitrogen,nitrite,nitrate,organic nitrogen,suspended solid,dissolved oxygen,were tested.The results showed that the egesta of the fish reared and the feedstuff residual could be removed efficiently.The removal efficiency of ammonia nitrogen and protein in the recirculation system was very high by entering ozone into the protein skimmer.The removal rate of protein,ammonia nitrogen,nitrite,nitrate,organic nitrogen,suspended solid were various along with the different ozone concentrations.And the dissolved oxygen was greatly increased.展开更多
Recent years have witnessed a booming of the industry of civil Unmanned Aircraft System(UAS).As an emerging industry,the UAS industry has been attracting great attention from governments of all countries and the aviat...Recent years have witnessed a booming of the industry of civil Unmanned Aircraft System(UAS).As an emerging industry,the UAS industry has been attracting great attention from governments of all countries and the aviation industry.UAS are highly digitalized,informationized,and intelligent;therefore,their integration into the national airspace system has become an important trend in the development of civil aviation.However,the complexity of UAS operation poses great challenges to the traditional aviation regulatory system and technical means.How to prevent collisions between UASs and between UAS and manned aircraft to achieve safe and efficient operation in the integrated operating airspace has become a common challenge for industry and academia around the world.In recent years,the international community has carried out a great amount of work and experiments in the air traffic management of UAS and some of the key technologies.This paper attempts to make a review of the UAS separation management and key technologies in collision avoidance in the integrated airspace,mainly focusing on the current situation of UAS Traffic Management(UTM),safety separation standards,detection system,collision risk prediction,collision avoidance,safety risk assessment,etc.,as well as an analysis of the bottlenecks that the current researches encountered and their development trends,so as to provide some insights and references for further research in this regard.Finally,this paper makes a further summary of some of the research highlights and challenges.展开更多
文摘The water treatment effect of a protein skimmer with different ozone concentrations for recirculation system of industrial fish farming was studied in this paper.Foam separation principle and ammonia nitrogen removing theory of the protein skimmer was described.A protein skimmer with a discharge of 50 m3·h-1 was designed.The skimmer was used in a recirculation system,and relative water quality parameters: protein,ammonia nitrogen,nitrite,nitrate,organic nitrogen,suspended solid,dissolved oxygen,were tested.The results showed that the egesta of the fish reared and the feedstuff residual could be removed efficiently.The removal efficiency of ammonia nitrogen and protein in the recirculation system was very high by entering ozone into the protein skimmer.The removal rate of protein,ammonia nitrogen,nitrite,nitrate,organic nitrogen,suspended solid were various along with the different ozone concentrations.And the dissolved oxygen was greatly increased.
基金co-supported by the National Natural Science Foundation of China(Nos.U1933130,U1533119 and 71731001)the Major Project of Technological Innovation,China(No.2018AAA0100800)。
文摘Recent years have witnessed a booming of the industry of civil Unmanned Aircraft System(UAS).As an emerging industry,the UAS industry has been attracting great attention from governments of all countries and the aviation industry.UAS are highly digitalized,informationized,and intelligent;therefore,their integration into the national airspace system has become an important trend in the development of civil aviation.However,the complexity of UAS operation poses great challenges to the traditional aviation regulatory system and technical means.How to prevent collisions between UASs and between UAS and manned aircraft to achieve safe and efficient operation in the integrated operating airspace has become a common challenge for industry and academia around the world.In recent years,the international community has carried out a great amount of work and experiments in the air traffic management of UAS and some of the key technologies.This paper attempts to make a review of the UAS separation management and key technologies in collision avoidance in the integrated airspace,mainly focusing on the current situation of UAS Traffic Management(UTM),safety separation standards,detection system,collision risk prediction,collision avoidance,safety risk assessment,etc.,as well as an analysis of the bottlenecks that the current researches encountered and their development trends,so as to provide some insights and references for further research in this regard.Finally,this paper makes a further summary of some of the research highlights and challenges.
