We report a new system of organic materials for photon-gated persistent spectral hole burning by donor-acceptor electron transfer:a tetrabenzoporphyrin derivative as donor and one of several aromatic cyanides as an ac...We report a new system of organic materials for photon-gated persistent spectral hole burning by donor-acceptor electron transfer:a tetrabenzoporphyrin derivative as donor and one of several aromatic cyanides as an acceptor in a poly(methyl methacrylate)(FMMA)host matrix.Up to 50C%deep spectral holes in transmission were burnt and appeared very high hole burning efficiency.展开更多
Conceived as countering market outcomes,British planning focuses on the development and design of land use and the built environment,with a close relationship with the economy.The public and politicians in the UK ofte...Conceived as countering market outcomes,British planning focuses on the development and design of land use and the built environment,with a close relationship with the economy.The public and politicians in the UK often associate planning with rigorous regulations that prevent economic growth,and many stakeholders complain about the restrictions that planning puts on their autonomous activities.To explore this,this essay focuses on the definition and the nature of ‘inhibit’,‘regulate’,‘guide’ and ‘initiate’ features through the plan-making process and management in England,finding out a more proactive role for planning as guiding and initiating development.展开更多
基金Supported by the National Advanced Materials Committee of China(NAMCC).
文摘We report a new system of organic materials for photon-gated persistent spectral hole burning by donor-acceptor electron transfer:a tetrabenzoporphyrin derivative as donor and one of several aromatic cyanides as an acceptor in a poly(methyl methacrylate)(FMMA)host matrix.Up to 50C%deep spectral holes in transmission were burnt and appeared very high hole burning efficiency.
文摘Conceived as countering market outcomes,British planning focuses on the development and design of land use and the built environment,with a close relationship with the economy.The public and politicians in the UK often associate planning with rigorous regulations that prevent economic growth,and many stakeholders complain about the restrictions that planning puts on their autonomous activities.To explore this,this essay focuses on the definition and the nature of ‘inhibit’,‘regulate’,‘guide’ and ‘initiate’ features through the plan-making process and management in England,finding out a more proactive role for planning as guiding and initiating development.