Due to the unique physicochemical properties of fluorine atom,the introduction of fluorine or polyfluoroalkyl group has emerged as a pivotal strategy in pharmaceutical and agrochemical design.Radical fluoroalkylation ...Due to the unique physicochemical properties of fluorine atom,the introduction of fluorine or polyfluoroalkyl group has emerged as a pivotal strategy in pharmaceutical and agrochemical design.Radical fluoroalkylation reactions stand out as a particularly efficient and innovative synthetic platform,enabling the construction of a vast array of valuable organofluorine compounds.However,a major synthetic challenge persists─the development of a unified.展开更多
Fiber-optics daylighting system(FODS)demonstrates significant potential for enhancing natural light utilization efficiency while enabling a more continuous visible spectrum illumination to support circadian rhythm reg...Fiber-optics daylighting system(FODS)demonstrates significant potential for enhancing natural light utilization efficiency while enabling a more continuous visible spectrum illumination to support circadian rhythm regulation.It offers a promising solution for both building energy efficiency and indoor light environment comfort improvement.However,conventional FODS face critical limitations,including low coupling efficiency at the collector-fiber interface and uneven illumination distribution,which impede its practical application.Recent advancements in optical technology present new opportunities for performance optimization of the FODS.Departing from traditional homogenization approaches reliant on optical homogenizers,this study introduces a freeform-caustics-based collector design with discretized energy distribution across the receiving plane.This innovative freeform fiber-optics daylighting system(FFODS)simultaneously addresses localized thermal accumulation and improves coupling efficiency.Furthermore,diffuse transmission materials and a freeform lens are integrated as a dual-functional diffuser to reshaping emitted light and precisely manipulate optical wave fronts,thereby achieving stable and uniform illumination in the targeted area.On this basis,a systematically simulation analysis on the thermal characteristics and photometric performance of the system was conducted.The results validate that the FFODS achieves a 98.5%coupling efficiency with a 126 times reduction in geometric concentration ratio compared to Fresnel lens collector.The diffuser maintains illumination uniformity above 0.8 under bending and adjustment conditions,while realizing 91.5%workspace illumination efficiency in the targeted area.Overall,this novel FFODS provides a transformative technique for advancing conventional FODS with high efficiency and illumination uniformity.展开更多
基金the National Natural Science Foundation of China(22471187)the Zhejiang Provincial Education Funds(Y202455377).
文摘Due to the unique physicochemical properties of fluorine atom,the introduction of fluorine or polyfluoroalkyl group has emerged as a pivotal strategy in pharmaceutical and agrochemical design.Radical fluoroalkylation reactions stand out as a particularly efficient and innovative synthetic platform,enabling the construction of a vast array of valuable organofluorine compounds.However,a major synthetic challenge persists─the development of a unified.
基金supported by the National Natural Science Foundation of China(Grant No.52478100,No.52425801,No.52130803,No.52408102)the Natural Science Foundation of Sichuan Province(2024NSFSC0916)the Natural Science Foundation of Jiangsu Province(BK20241348).
文摘Fiber-optics daylighting system(FODS)demonstrates significant potential for enhancing natural light utilization efficiency while enabling a more continuous visible spectrum illumination to support circadian rhythm regulation.It offers a promising solution for both building energy efficiency and indoor light environment comfort improvement.However,conventional FODS face critical limitations,including low coupling efficiency at the collector-fiber interface and uneven illumination distribution,which impede its practical application.Recent advancements in optical technology present new opportunities for performance optimization of the FODS.Departing from traditional homogenization approaches reliant on optical homogenizers,this study introduces a freeform-caustics-based collector design with discretized energy distribution across the receiving plane.This innovative freeform fiber-optics daylighting system(FFODS)simultaneously addresses localized thermal accumulation and improves coupling efficiency.Furthermore,diffuse transmission materials and a freeform lens are integrated as a dual-functional diffuser to reshaping emitted light and precisely manipulate optical wave fronts,thereby achieving stable and uniform illumination in the targeted area.On this basis,a systematically simulation analysis on the thermal characteristics and photometric performance of the system was conducted.The results validate that the FFODS achieves a 98.5%coupling efficiency with a 126 times reduction in geometric concentration ratio compared to Fresnel lens collector.The diffuser maintains illumination uniformity above 0.8 under bending and adjustment conditions,while realizing 91.5%workspace illumination efficiency in the targeted area.Overall,this novel FFODS provides a transformative technique for advancing conventional FODS with high efficiency and illumination uniformity.
