Microreaction technology is one of the most innovative and rapid developing fields in chemical engineering, synthesis and process technology. Many expectations toward enhanced product selectivity, yield and purity, im...Microreaction technology is one of the most innovative and rapid developing fields in chemical engineering, synthesis and process technology. Many expectations toward enhanced product selectivity, yield and purity, improved safety, and access to new products and processes are directed to the microreaction technology. Microfluidic mixer is the most important component in microfluidic devices. Based on various principles, active and passive micromixers have been designed and investigated. This review is focused on the recent developments in microfluidic mixers. An overview of the flow phenomena and mixing characteristics in active and passive micromixers is presented, including the types of physical phenomena and their utilization in micromixers. Due to the simple fabrication technology and the easy implementation in a complex microfluidic system, T-micromixer is highlighted as an example to illustrate the effect of design and operating parameters on mixing efficiency and fuid flow inside microfluidic mixers.展开更多
The extensive existence of microplastics in the marine environment and the various definite and indefinite harm to the living creatures have been paid much attention.In this paper,the definition,source and pollution o...The extensive existence of microplastics in the marine environment and the various definite and indefinite harm to the living creatures have been paid much attention.In this paper,the definition,source and pollution of micro(Nano)plastics in marine environment are reviewed.The related literatures are retrieved by using big data platform,the distribution characteristics of micro(Nano)plastics in the marine environment,control measures and so on,and the characteristics of key words making,resource distribution and contribution rate of research institutions are comprehensively analyzed.It provides the technical support for the scientific management of micro(Nano)plastics in the future.展开更多
In this paper,the fixed_point theorem is used to estimated an asymptotic solution of initial value problems for a class of third nonlinear differential equations which has double initial_layer properties. We obtain th...In this paper,the fixed_point theorem is used to estimated an asymptotic solution of initial value problems for a class of third nonlinear differential equations which has double initial_layer properties. We obtain the uniformly valid asymptotic expansion of any orders including boundary layers.展开更多
We study the Cauchy problem for a nonlinear evolution system with singularintegral differential terms.By means of some a priori estimates of the solution and theLeray-Schauder's fixed point theorem, we prove the e...We study the Cauchy problem for a nonlinear evolution system with singularintegral differential terms.By means of some a priori estimates of the solution and theLeray-Schauder's fixed point theorem, we prove the existence and the uniqueness theoremsof the generalized global solution of the mentioned problem.展开更多
基金the National High Technology Research and Development Program of China(2006AA030202,2006AA05Z316)
文摘Microreaction technology is one of the most innovative and rapid developing fields in chemical engineering, synthesis and process technology. Many expectations toward enhanced product selectivity, yield and purity, improved safety, and access to new products and processes are directed to the microreaction technology. Microfluidic mixer is the most important component in microfluidic devices. Based on various principles, active and passive micromixers have been designed and investigated. This review is focused on the recent developments in microfluidic mixers. An overview of the flow phenomena and mixing characteristics in active and passive micromixers is presented, including the types of physical phenomena and their utilization in micromixers. Due to the simple fabrication technology and the easy implementation in a complex microfluidic system, T-micromixer is highlighted as an example to illustrate the effect of design and operating parameters on mixing efficiency and fuid flow inside microfluidic mixers.
基金supported by the Opening Foundation of Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria(2019-04)the Science and Technology Innovation Project for Youth of Tianjin Agricultural Development Service Center(19KY11).
文摘The extensive existence of microplastics in the marine environment and the various definite and indefinite harm to the living creatures have been paid much attention.In this paper,the definition,source and pollution of micro(Nano)plastics in marine environment are reviewed.The related literatures are retrieved by using big data platform,the distribution characteristics of micro(Nano)plastics in the marine environment,control measures and so on,and the characteristics of key words making,resource distribution and contribution rate of research institutions are comprehensively analyzed.It provides the technical support for the scientific management of micro(Nano)plastics in the future.
文摘In this paper,the fixed_point theorem is used to estimated an asymptotic solution of initial value problems for a class of third nonlinear differential equations which has double initial_layer properties. We obtain the uniformly valid asymptotic expansion of any orders including boundary layers.
文摘We study the Cauchy problem for a nonlinear evolution system with singularintegral differential terms.By means of some a priori estimates of the solution and theLeray-Schauder's fixed point theorem, we prove the existence and the uniqueness theoremsof the generalized global solution of the mentioned problem.
