To optimize the production process of occidium vaccine and provide the basis and methods for the production of live vaccine,this experiment uses the collected liquid with different centrifugal forces and centrifugatio...To optimize the production process of occidium vaccine and provide the basis and methods for the production of live vaccine,this experiment uses the collected liquid with different centrifugal forces and centrifugation time,to measure and compare the recovery,purity,collection time and costs of coccidian oocyst,for the purpose of exploring the impact of washing conditions on coccidian oocyst collection in chicken manure.The results show that for the centrifugal machine with the radius of 17.2 cm,the best washing centrifugal rotational speed is 2500 rpm /min,that is,the best washing centrifugal force RCF = 1201.85 g,and the centrifugation time is 12 min.展开更多
Down-hole tubular string buckling is the most classic and complex part of tubular string mechanics in well engineering. Studies of down-hole tubular string buckling not only have theoretical significance in revealing ...Down-hole tubular string buckling is the most classic and complex part of tubular string mechanics in well engineering. Studies of down-hole tubular string buckling not only have theoretical significance in revealing the buckling mechanism but also have prominent practical value in design and control of tubular strings. In this review, the basic principles and applicable scope of three classic research methods （the beam-column model, buck- ling differential equation, and energy method） are intro- duced. The critical buckling loads and the post-buckling behavior under different buckling modes in vertical, inclined, horizontal, and curved wellbores from different researchers are presented and compared. The current understanding of the effects of torque, boundary condi- tions, friction force, and connectors on down-hole tubular string buckling is illustrated. Meanwhile, some unsolved problems and controversial conclusions are discussed. Future research should be focused on sophisticated description of buckling behavior and the coupling effect of multiple factors. In addition, active control of down-hole tubular string buckling behavior needs some attention urgently.展开更多
In the present paper the concept and properties of the residual functional in Sobolev space are investigated.The weak compactness,force condition,lower semi-continuity and convex of the residual functional are proved....In the present paper the concept and properties of the residual functional in Sobolev space are investigated.The weak compactness,force condition,lower semi-continuity and convex of the residual functional are proved.In Sobolev space,the minimum principle of the residual functional is proposed.The minimum existence theoreomfor J(u)=0 is given by the modern critical point theory.And the equivalence theorem or five equivalence forms for the residual functional equation are also proved.展开更多
文摘To optimize the production process of occidium vaccine and provide the basis and methods for the production of live vaccine,this experiment uses the collected liquid with different centrifugal forces and centrifugation time,to measure and compare the recovery,purity,collection time and costs of coccidian oocyst,for the purpose of exploring the impact of washing conditions on coccidian oocyst collection in chicken manure.The results show that for the centrifugal machine with the radius of 17.2 cm,the best washing centrifugal rotational speed is 2500 rpm /min,that is,the best washing centrifugal force RCF = 1201.85 g,and the centrifugation time is 12 min.
基金the financial support from the Natural Science Foundation of China (NSFC,51221003,U1262201)the Science Foundation of China University of Petroleum,Beijing (No.00000)supported by other projects (Grant Numbers:2014A-4214,2013AA064803,2011ZX05009-005)
文摘Down-hole tubular string buckling is the most classic and complex part of tubular string mechanics in well engineering. Studies of down-hole tubular string buckling not only have theoretical significance in revealing the buckling mechanism but also have prominent practical value in design and control of tubular strings. In this review, the basic principles and applicable scope of three classic research methods （the beam-column model, buck- ling differential equation, and energy method） are intro- duced. The critical buckling loads and the post-buckling behavior under different buckling modes in vertical, inclined, horizontal, and curved wellbores from different researchers are presented and compared. The current understanding of the effects of torque, boundary condi- tions, friction force, and connectors on down-hole tubular string buckling is illustrated. Meanwhile, some unsolved problems and controversial conclusions are discussed. Future research should be focused on sophisticated description of buckling behavior and the coupling effect of multiple factors. In addition, active control of down-hole tubular string buckling behavior needs some attention urgently.
文摘In the present paper the concept and properties of the residual functional in Sobolev space are investigated.The weak compactness,force condition,lower semi-continuity and convex of the residual functional are proved.In Sobolev space,the minimum principle of the residual functional is proposed.The minimum existence theoreomfor J(u)=0 is given by the modern critical point theory.And the equivalence theorem or five equivalence forms for the residual functional equation are also proved.
