快速城市化背景下,城市绿色空间为人与自然的接触提供了宝贵机会。生物多样性作为绿色空间的基本要素,是连接人与自然的重要纽带。关于绿色空间生物多样性感知的既有研究多关注于单一对象或主题,尚缺少系统性梳理,厘清该领域研究脉络,...快速城市化背景下,城市绿色空间为人与自然的接触提供了宝贵机会。生物多样性作为绿色空间的基本要素,是连接人与自然的重要纽带。关于绿色空间生物多样性感知的既有研究多关注于单一对象或主题,尚缺少系统性梳理,厘清该领域研究脉络,将为从生物多样性感知方面开展城市绿色空间设计提供参考。文章以中国知网及Web of Science数据库为基础,对相关文献进行检索和统计分析,结果发现:1)当前研究热点为生物多样性感知偏好与影响因素,基于生物多样性感知的健康恢复效益与生态系统文化服务,以及各尺度生物多样性感知差异等;2)常用研究方法为现场实验、控制实验、模型模拟和网络数据分析4大类。基于研究结果,提出未来研究趋势包括:1)生物多样性感知研究新方向探索,如不同气候的影响、与生物多样性保护协调、感知行为研究等;2)通过综合现有方法、引入新兴技术、结合多感官等,探索感知研究的新方法。3)探索生物多样性感知与城市绿色空间设计结合的新方式。展开更多
This work describes the discharge characteristics and acetone degradation with plasma under different electric fields based on a coaxial cylindrical dielectric barrier discharge(DBD)device energized by pulsed power.It...This work describes the discharge characteristics and acetone degradation with plasma under different electric fields based on a coaxial cylindrical dielectric barrier discharge(DBD)device energized by pulsed power.It is found that the segmented electrodes with appropriate spacing in coaxial cylindrical DBD are beneficial to the plasma ionization.In this work,the plasma distribution,discharge thermal effect,ionization of reactive species,and acetone degradation performance in coaxial cylindrical DBD with different segmented electrodes are systematically investigated.The experimental results show that segmented electrodes with a certain distance can cause additional ionization in the non-electrode-covered region between adjacent electrodes,thus enlarging the plasma region compared with a single electrode with equivalent total electrode length.The additional ionization involved the inner volume discharge between the quartz tubes and the outer surface discharge along the surface of the external quartz tube.The spatial distributions of the inner volume discharge and external surface discharge were predominantly governed by the radial and axial components of the inter-electrode electric field,respectively.The external surface discharge exhibited significant suppression when the electrode spacing was<1.5 mm,and it reached its maximum length at 3 mm spacing.When the electrode distance increased to 7-9 mm,a weak ionizing region appeared in the middle of the adjacent electrodes,which could be attributed to the gradual attenuation of the radial component with the increasing electrode spacing.A higher thermal effect and better oxidation of acetone to CO_(x)(CO and CO_(2))were achieved with the segmented electrode;the dual-segment configuration(3 mm per electrode)achieved a reactor temperature of 63.4℃,representing a 10℃enhancement over comparable single-electrode systems.Similarly,the CO_(2)and CO concentration reached 328.8 mg/m3and 105.7 mg/m3,respectively,in two 3 mm long segmented electrodes,which was an increase of 12.2%and 25.6%,respectively,compared with the single electrode.Notably,considering the equivalent ionization of the inner discharge with different electrodes,the enhanced thermal effects and CO_(x)conversion efficiency directly correlate with the expanded plasma zone induced by electrode segmentation.This work provides critical insights into optimizing electrode configurations for efficient plasma-assisted volatile organic compound degradation systems.展开更多
文摘快速城市化背景下,城市绿色空间为人与自然的接触提供了宝贵机会。生物多样性作为绿色空间的基本要素,是连接人与自然的重要纽带。关于绿色空间生物多样性感知的既有研究多关注于单一对象或主题,尚缺少系统性梳理,厘清该领域研究脉络,将为从生物多样性感知方面开展城市绿色空间设计提供参考。文章以中国知网及Web of Science数据库为基础,对相关文献进行检索和统计分析,结果发现:1)当前研究热点为生物多样性感知偏好与影响因素,基于生物多样性感知的健康恢复效益与生态系统文化服务,以及各尺度生物多样性感知差异等;2)常用研究方法为现场实验、控制实验、模型模拟和网络数据分析4大类。基于研究结果,提出未来研究趋势包括:1)生物多样性感知研究新方向探索,如不同气候的影响、与生物多样性保护协调、感知行为研究等;2)通过综合现有方法、引入新兴技术、结合多感官等,探索感知研究的新方法。3)探索生物多样性感知与城市绿色空间设计结合的新方式。
文摘This work describes the discharge characteristics and acetone degradation with plasma under different electric fields based on a coaxial cylindrical dielectric barrier discharge(DBD)device energized by pulsed power.It is found that the segmented electrodes with appropriate spacing in coaxial cylindrical DBD are beneficial to the plasma ionization.In this work,the plasma distribution,discharge thermal effect,ionization of reactive species,and acetone degradation performance in coaxial cylindrical DBD with different segmented electrodes are systematically investigated.The experimental results show that segmented electrodes with a certain distance can cause additional ionization in the non-electrode-covered region between adjacent electrodes,thus enlarging the plasma region compared with a single electrode with equivalent total electrode length.The additional ionization involved the inner volume discharge between the quartz tubes and the outer surface discharge along the surface of the external quartz tube.The spatial distributions of the inner volume discharge and external surface discharge were predominantly governed by the radial and axial components of the inter-electrode electric field,respectively.The external surface discharge exhibited significant suppression when the electrode spacing was<1.5 mm,and it reached its maximum length at 3 mm spacing.When the electrode distance increased to 7-9 mm,a weak ionizing region appeared in the middle of the adjacent electrodes,which could be attributed to the gradual attenuation of the radial component with the increasing electrode spacing.A higher thermal effect and better oxidation of acetone to CO_(x)(CO and CO_(2))were achieved with the segmented electrode;the dual-segment configuration(3 mm per electrode)achieved a reactor temperature of 63.4℃,representing a 10℃enhancement over comparable single-electrode systems.Similarly,the CO_(2)and CO concentration reached 328.8 mg/m3and 105.7 mg/m3,respectively,in two 3 mm long segmented electrodes,which was an increase of 12.2%and 25.6%,respectively,compared with the single electrode.Notably,considering the equivalent ionization of the inner discharge with different electrodes,the enhanced thermal effects and CO_(x)conversion efficiency directly correlate with the expanded plasma zone induced by electrode segmentation.This work provides critical insights into optimizing electrode configurations for efficient plasma-assisted volatile organic compound degradation systems.
