在可再生能源与储能技术发展的同时,多通道DC/DC变换器拓扑,由于其本身的优点,最近也受到广泛关注。本文提出了一款带高频变压器的双向四重(由四部分组成的)有源桥式(QAB)DC/DC变换器。采用了全桥结构的功率变换器,相位移的调制则用于研...在可再生能源与储能技术发展的同时,多通道DC/DC变换器拓扑,由于其本身的优点,最近也受到广泛关注。本文提出了一款带高频变压器的双向四重(由四部分组成的)有源桥式(QAB)DC/DC变换器。采用了全桥结构的功率变换器,相位移的调制则用于研究QAB变换器的功率转换。应用这一调制方式,在改变或总计Q A B变换器输出和接收的功率时,将受到相位移的影响。由(1)多输入单输出(平衡的电压源);(2)多输入单输出(不平衡的电压源):(3)多输入多输出(平衡的电压源);及(4)单输入多输出(不平衡的负载);对QAB的多重结构进行了评估。通过MATLAB模拟链分析了2.5kw系统的模拟结果。利用这一模拟也讨论了功率和效率,从而发现,在90°相位移下能达到最大的功率。展开更多
The novel quaternary ammonium bromide (QAB)-containing oligomers were synthesized and applied for developing an antibacterial resin composite. Compressive strength (CS) and S. mutans (an oral bacteria strain) viabilit...The novel quaternary ammonium bromide (QAB)-containing oligomers were synthesized and applied for developing an antibacterial resin composite. Compressive strength (CS) and S. mutans (an oral bacteria strain) viability were used to evaluate the mechanical strength and antibacterial activity of the formed composites. All the QAB-modified resin composites showed significant antibacterial activity and mechanical strength reduction. Increasing chain length and loading significantly enhanced the antibacterial activity but dramatically reduced the CS as well. The 30-day aging study showed that the incorporation of the QAB accelerated the degradation of the composite, suggesting that the QAB may not be well suitable for development of antibacterial dental resin composites or at least the QAB loading should be well controlled, unlike its use in dental glass-ionomer cements. The work in this study is beneficial and valuable to those who are interested in studying antibacterial dental resin composites.展开更多
文摘在可再生能源与储能技术发展的同时,多通道DC/DC变换器拓扑,由于其本身的优点,最近也受到广泛关注。本文提出了一款带高频变压器的双向四重(由四部分组成的)有源桥式(QAB)DC/DC变换器。采用了全桥结构的功率变换器,相位移的调制则用于研究QAB变换器的功率转换。应用这一调制方式,在改变或总计Q A B变换器输出和接收的功率时,将受到相位移的影响。由(1)多输入单输出(平衡的电压源);(2)多输入单输出(不平衡的电压源):(3)多输入多输出(平衡的电压源);及(4)单输入多输出(不平衡的负载);对QAB的多重结构进行了评估。通过MATLAB模拟链分析了2.5kw系统的模拟结果。利用这一模拟也讨论了功率和效率,从而发现,在90°相位移下能达到最大的功率。
文摘The novel quaternary ammonium bromide (QAB)-containing oligomers were synthesized and applied for developing an antibacterial resin composite. Compressive strength (CS) and S. mutans (an oral bacteria strain) viability were used to evaluate the mechanical strength and antibacterial activity of the formed composites. All the QAB-modified resin composites showed significant antibacterial activity and mechanical strength reduction. Increasing chain length and loading significantly enhanced the antibacterial activity but dramatically reduced the CS as well. The 30-day aging study showed that the incorporation of the QAB accelerated the degradation of the composite, suggesting that the QAB may not be well suitable for development of antibacterial dental resin composites or at least the QAB loading should be well controlled, unlike its use in dental glass-ionomer cements. The work in this study is beneficial and valuable to those who are interested in studying antibacterial dental resin composites.
