Negative air ions(NAIs)in indoor environments have been suggested to positively impact human health by effectively reducing particulate contamination and gaseous pollutants,as well as inhibiting the growth of microorg...Negative air ions(NAIs)in indoor environments have been suggested to positively impact human health by effectively reducing particulate contamination and gaseous pollutants,as well as inhibiting the growth of microorganisms,bacteria and viruses.This study investigates the common ionizers with different module types,and the mechanism of NAIs for enhancing indoor air quality,as well as the positive and negative impacts on human health.The association between NAI concentrations and human health outcomes is examined,and alternative measures to balance beneficial and unavailing effects are investigated.While NAIs demonstrate efficacy in removing particulate pollutants,alleviating depression,enhancing cognitive function and even stimulating sympathetic activity,it is pertinent to acknowledge the presence of contradictory findings concerning their effects on cardiac autonomic function and respiratory physiology.To address this complexity,it is imperative to consider alternative measures that strike a balance between the beneficial and unavailing effects of NAIs.These measures can encompass a general assessment of the characteristics of particulate pollutants,a strategic selection of ionizer technologies,and adherence to the recommended optimal concentration thresholds of NAIs.展开更多
CLC谐振型感应电能传输系统较传统的LC谐振型系统具有更大的谐振容量和更小的频率漂移,但由于系统的高阶及多周期点特性,对CLC型系统的控制更为困难。为实现CLC谐振型系统的输出鲁棒控制,将系统状态变量及非线性开关函数进行频域线性化...CLC谐振型感应电能传输系统较传统的LC谐振型系统具有更大的谐振容量和更小的频率漂移,但由于系统的高阶及多周期点特性,对CLC型系统的控制更为困难。为实现CLC谐振型系统的输出鲁棒控制,将系统状态变量及非线性开关函数进行频域线性化,通过平衡点变换,得到平衡点附近的广义状态空间平均(generalized state space averaging,GSSA)扰动模型。建立了系统的H∞控制系统结构,提出GSSA模型误差扰动有界定理并给出了证明。给出了相应的H∞扰动控制律,并通过仿真及实验结果验证了该模型及控制方法的有效性。展开更多
以3-[N,N-二甲基-[2-（2-甲基丙-2-烯酰氧基）乙基]铵]丙烷-1-磺酸内盐（SPE）为功能单体,季戊四醇三丙烯酸酯（PETA）为交联剂,环己醇和乙二醇（EG）为致孔剂,通过原位聚合法制备磺酸甜菜碱型两性离子亲水毛细管整体柱。优化单体、交...以3-[N,N-二甲基-[2-（2-甲基丙-2-烯酰氧基）乙基]铵]丙烷-1-磺酸内盐（SPE）为功能单体,季戊四醇三丙烯酸酯（PETA）为交联剂,环己醇和乙二醇（EG）为致孔剂,通过原位聚合法制备磺酸甜菜碱型两性离子亲水毛细管整体柱。优化单体、交联剂和致孔剂的比例等因素,考察了不同SPE含量对整体柱性能和选择性的影响。在最优制备条件下,以苯酚类化合物、烷基苯类化合物和苯甲酸类化合物为分离对象,评价该整体柱的色谱性能以及分离机理。在不同的色谱条件下,该整体柱具有亲水、疏水以及离子交换作用。此整体柱在0.05 m L/min的流速下（线速度为0.265 mm/s）分离烷基苯类化合物时,柱效高达41000-56000 plates/m,该整体柱重现性良好,连续运行的重现性（RSD）低于1.2%。在亲水/离子交换色谱模式下,该整体柱可应用于核苷和碱基的高效分离。展开更多
基金Research Project of Marine Design and Research Institute of China。
文摘Negative air ions(NAIs)in indoor environments have been suggested to positively impact human health by effectively reducing particulate contamination and gaseous pollutants,as well as inhibiting the growth of microorganisms,bacteria and viruses.This study investigates the common ionizers with different module types,and the mechanism of NAIs for enhancing indoor air quality,as well as the positive and negative impacts on human health.The association between NAI concentrations and human health outcomes is examined,and alternative measures to balance beneficial and unavailing effects are investigated.While NAIs demonstrate efficacy in removing particulate pollutants,alleviating depression,enhancing cognitive function and even stimulating sympathetic activity,it is pertinent to acknowledge the presence of contradictory findings concerning their effects on cardiac autonomic function and respiratory physiology.To address this complexity,it is imperative to consider alternative measures that strike a balance between the beneficial and unavailing effects of NAIs.These measures can encompass a general assessment of the characteristics of particulate pollutants,a strategic selection of ionizer technologies,and adherence to the recommended optimal concentration thresholds of NAIs.
文摘CLC谐振型感应电能传输系统较传统的LC谐振型系统具有更大的谐振容量和更小的频率漂移,但由于系统的高阶及多周期点特性,对CLC型系统的控制更为困难。为实现CLC谐振型系统的输出鲁棒控制,将系统状态变量及非线性开关函数进行频域线性化,通过平衡点变换,得到平衡点附近的广义状态空间平均(generalized state space averaging,GSSA)扰动模型。建立了系统的H∞控制系统结构,提出GSSA模型误差扰动有界定理并给出了证明。给出了相应的H∞扰动控制律,并通过仿真及实验结果验证了该模型及控制方法的有效性。
文摘以3-[N,N-二甲基-[2-（2-甲基丙-2-烯酰氧基）乙基]铵]丙烷-1-磺酸内盐（SPE）为功能单体,季戊四醇三丙烯酸酯（PETA）为交联剂,环己醇和乙二醇（EG）为致孔剂,通过原位聚合法制备磺酸甜菜碱型两性离子亲水毛细管整体柱。优化单体、交联剂和致孔剂的比例等因素,考察了不同SPE含量对整体柱性能和选择性的影响。在最优制备条件下,以苯酚类化合物、烷基苯类化合物和苯甲酸类化合物为分离对象,评价该整体柱的色谱性能以及分离机理。在不同的色谱条件下,该整体柱具有亲水、疏水以及离子交换作用。此整体柱在0.05 m L/min的流速下（线速度为0.265 mm/s）分离烷基苯类化合物时,柱效高达41000-56000 plates/m,该整体柱重现性良好,连续运行的重现性（RSD）低于1.2%。在亲水/离子交换色谱模式下,该整体柱可应用于核苷和碱基的高效分离。
