As a new favorite in the field of smart materials,smart windows,with visual stimulus sensing functions,have attracted extensive attention for their high transparency,sensitive response to environmental stimulus,and re...As a new favorite in the field of smart materials,smart windows,with visual stimulus sensing functions,have attracted extensive attention for their high transparency,sensitive response to environmental stimulus,and reversible changes in light transmittance.In this paper,the PVA-coPE nanofiber film,which was completely opaque like paper,was used as filling phase and reacted with water-soluble N-vinyl-2-pyrrolidone(NVP)by photopolymerization to produce a flexible transparency polyvinyl pyrrolidone/spraying PVA-co-PE nanofiber films(PVP/SPNFs)composite film.Among them,the small size effect of PVA-coPE nanofibers played a pivotal role in improving the film's transparency.Nevertheless,the PVP's reversible adsorption-desorption behavior of water molecules made its refractive index change dynamically and reversibly,which led to the visual transition of composite film from transparent to opaque just like that of electronic smart windows.Additionally,the reversible transition rate of film's transparency can be effectively regulated by the nanofiber stack structure.This new design of transparency visualization transforms composite film in response to humidity,innovates the electrically controlled smart windows on energy and realizes the effective utilization of natural resources such as water and humidity,which has a great application prospect in the field of flexible optoelectronic devices,intelligent buildings,and smart writing.展开更多
线性系统化为Luenberger能控规范型后可以很方便地进行极点配置.本文证明,在完全能控的情况下,MIMO系统能否化为Luenberger能控规范型与系统的最大能控性指数和最小能控性指数之差有关.如果两者之差大于1,就可能在控制矩阵B中除第l行(l=...线性系统化为Luenberger能控规范型后可以很方便地进行极点配置.本文证明,在完全能控的情况下,MIMO系统能否化为Luenberger能控规范型与系统的最大能控性指数和最小能控性指数之差有关.如果两者之差大于1,就可能在控制矩阵B中除第l行(l=sum from i=1 to m μi,1≤m≤r)以外的位置上出现非零元.结果表明,用Luenberger能控规范型方法进行极点配置有一定的局限性.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51873166 and 51873165)Science and Technology Innovation Major Projects of Hubei Province(No.2019AAA035)+2 种基金Central Guidance for Local Science and Technology Development Projects(No.2018ZYYD057)Science and Technology Program of Wuhan Technology Bureau(No.2017060201010165)National Key Research and Development Program of China(No.2016YFC0206101).
文摘As a new favorite in the field of smart materials,smart windows,with visual stimulus sensing functions,have attracted extensive attention for their high transparency,sensitive response to environmental stimulus,and reversible changes in light transmittance.In this paper,the PVA-coPE nanofiber film,which was completely opaque like paper,was used as filling phase and reacted with water-soluble N-vinyl-2-pyrrolidone(NVP)by photopolymerization to produce a flexible transparency polyvinyl pyrrolidone/spraying PVA-co-PE nanofiber films(PVP/SPNFs)composite film.Among them,the small size effect of PVA-coPE nanofibers played a pivotal role in improving the film's transparency.Nevertheless,the PVP's reversible adsorption-desorption behavior of water molecules made its refractive index change dynamically and reversibly,which led to the visual transition of composite film from transparent to opaque just like that of electronic smart windows.Additionally,the reversible transition rate of film's transparency can be effectively regulated by the nanofiber stack structure.This new design of transparency visualization transforms composite film in response to humidity,innovates the electrically controlled smart windows on energy and realizes the effective utilization of natural resources such as water and humidity,which has a great application prospect in the field of flexible optoelectronic devices,intelligent buildings,and smart writing.
文摘线性系统化为Luenberger能控规范型后可以很方便地进行极点配置.本文证明,在完全能控的情况下,MIMO系统能否化为Luenberger能控规范型与系统的最大能控性指数和最小能控性指数之差有关.如果两者之差大于1,就可能在控制矩阵B中除第l行(l=sum from i=1 to m μi,1≤m≤r)以外的位置上出现非零元.结果表明,用Luenberger能控规范型方法进行极点配置有一定的局限性.
