以双管法合成2-^(18)F-2-脱氧-β-D-葡萄糖(^(18)F-FDG)为例,系统分析了影响^(18)F-FDG合成效率的各因素。结果表明,合成体系中的含水量是影响^(18)F-FDG合成效率的主要因素;不纯的回收H_2^(18)O也是合成效率下降的原因之一;前体的用量...以双管法合成2-^(18)F-2-脱氧-β-D-葡萄糖(^(18)F-FDG)为例,系统分析了影响^(18)F-FDG合成效率的各因素。结果表明,合成体系中的含水量是影响^(18)F-FDG合成效率的主要因素;不纯的回收H_2^(18)O也是合成效率下降的原因之一;前体的用量不低于15mg即可满足要求,缩短合成时间有利于提高合成的效率(End of Synthe-sis,EOS)。通过降低体系中水的含量,合成时间从55min缩短到44min,校正效率(End of Bombardment,EOB)从50％提高到65％。展开更多
Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand,...Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand, and low Power Factor （PF） for industrial plants, starting with walk through surveys, data analysis, providing advices to insure personnel involvement, and suggestions of practical circuits to attain the target. Elements of effective energy management program can be configured of management commitment, audit, analysis and implementation. Energy management opportunities can he operational and maintenance strategies, retrofit or modification strategies and new design strategies. The new technique of Power Factor Correction （PFC） that has been designed was the High Active Boost Power Factor Correction Pre-regulator Circuit, which was resulted in single / three phase PFC of about unity, in hand with a regulated output single phase voltage of about 220 VAC.展开更多
文摘以双管法合成2-^(18)F-2-脱氧-β-D-葡萄糖(^(18)F-FDG)为例,系统分析了影响^(18)F-FDG合成效率的各因素。结果表明,合成体系中的含水量是影响^(18)F-FDG合成效率的主要因素;不纯的回收H_2^(18)O也是合成效率下降的原因之一;前体的用量不低于15mg即可满足要求,缩短合成时间有利于提高合成的效率(End of Synthe-sis,EOS)。通过降低体系中水的含量,合成时间从55min缩短到44min,校正效率(End of Bombardment,EOB)从50％提高到65％。
文摘Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand, and low Power Factor （PF） for industrial plants, starting with walk through surveys, data analysis, providing advices to insure personnel involvement, and suggestions of practical circuits to attain the target. Elements of effective energy management program can be configured of management commitment, audit, analysis and implementation. Energy management opportunities can he operational and maintenance strategies, retrofit or modification strategies and new design strategies. The new technique of Power Factor Correction （PFC） that has been designed was the High Active Boost Power Factor Correction Pre-regulator Circuit, which was resulted in single / three phase PFC of about unity, in hand with a regulated output single phase voltage of about 220 VAC.
