As an emerging class of crystalline porous materials,covalent organic frameworks(COFs)have been widely used as catalysts or catalyst supports.Flexible regulation of the pores and easy introduction of functional active...As an emerging class of crystalline porous materials,covalent organic frameworks(COFs)have been widely used as catalysts or catalyst supports.Flexible regulation of the pores and easy introduction of functional active sites onto the skeleton of COFs make them promising platforms for many catalysis applications.However,only a single function is generally observed in these COFs.Herein,we synthesized a negatively charged ionic COF(I-COF)and successfully incorporated functionalized counter ions,that is,metallic Mn2+and a coordination complex of manganese(Ⅱ)bipyridine complexes([Mn(bpy)2]2+),via a simple ion exchange process.The resulting I-COFs can act as effective heterogeneous catalysts for epoxidation reactions.We envisage that with this type of ionic architecture,a variety of other functional cations could be exchanged into the frameworks,thus making the COF a versatile platform for different applications.展开更多
The architecture of project management of distributed concurrent product design in a virtual enterprise is put forward. T he process of project management and its functions are presented. Product design process coo...The architecture of project management of distributed concurrent product design in a virtual enterprise is put forward. T he process of project management and its functions are presented. Product design process coordination is also discussed. First, based on the analysis of traditi onal project management, project management and coordination of distributed coop erative product design in the virtual enterprise is put forward. Then, aiming at the characteristics of a distributed concurrent product design process, the inh erent rules and complex interrelations in product development are studied. Accor dingly, the architecture of project management of distributed cooperative produc t design in a virtual enterprise is presented to adapt to distributed concurrent development of complex products. The main advantages of the architecture are al so discussed. Finally, the emphasis is placed on the project management process. Its main functions are set forth, such as project definition, task decompositio n and distribution, resource constraints and dynamic resource scheduling, proces s fusion, task scheduling and monitoring, project plan, cost and quality evaluat ion, etc.展开更多
文摘As an emerging class of crystalline porous materials,covalent organic frameworks(COFs)have been widely used as catalysts or catalyst supports.Flexible regulation of the pores and easy introduction of functional active sites onto the skeleton of COFs make them promising platforms for many catalysis applications.However,only a single function is generally observed in these COFs.Herein,we synthesized a negatively charged ionic COF(I-COF)and successfully incorporated functionalized counter ions,that is,metallic Mn2+and a coordination complex of manganese(Ⅱ)bipyridine complexes([Mn(bpy)2]2+),via a simple ion exchange process.The resulting I-COFs can act as effective heterogeneous catalysts for epoxidation reactions.We envisage that with this type of ionic architecture,a variety of other functional cations could be exchanged into the frameworks,thus making the COF a versatile platform for different applications.
文摘The architecture of project management of distributed concurrent product design in a virtual enterprise is put forward. T he process of project management and its functions are presented. Product design process coordination is also discussed. First, based on the analysis of traditi onal project management, project management and coordination of distributed coop erative product design in the virtual enterprise is put forward. Then, aiming at the characteristics of a distributed concurrent product design process, the inh erent rules and complex interrelations in product development are studied. Accor dingly, the architecture of project management of distributed cooperative produc t design in a virtual enterprise is presented to adapt to distributed concurrent development of complex products. The main advantages of the architecture are al so discussed. Finally, the emphasis is placed on the project management process. Its main functions are set forth, such as project definition, task decompositio n and distribution, resource constraints and dynamic resource scheduling, proces s fusion, task scheduling and monitoring, project plan, cost and quality evaluat ion, etc.
