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A double-layer radiative cooling coating that utilizes the refractive index difference between layers to achieve extremely high solar reflectivity
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作者 WANG FuQiang li chunzhe +5 位作者 YANG ZhenNing XIE WeiXin li Xiang XU ZengHui YAN YuYing CHENG ZiMing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第10期3182-3189,共8页
Passive daytime radiative cooling(PDRC)technology has great potential in reducing cooling energy consumption.In order to further improve the spectral performance of PDRC coatings,current researchers mostly focus on th... Passive daytime radiative cooling(PDRC)technology has great potential in reducing cooling energy consumption.In order to further improve the spectral performance of PDRC coatings,current researchers mostly focus on the selection and size design of functional particles,while ignoring the optical properties enhancement effect caused by the interlayer binder.In this study,based on the principle that the refractive index difference between layers enhanced the backscattering performance of the solar spectrum,we proposed and manufactured a double-layer PDRC coating with polyvinylidene difluoride(PVDF)as the filmforming material in the upper layer and polydimethylsiloxane(PDMS)as the film-forming material in the lower layer,both filled with Al_(2)O_(3) and SiO_(2) particles.The double-layer PDRC coating exhibited excellent spectral performance that a high solar reflectivity of 98%and an emissivity of 0.95 at the“atmospheric window”band.In comparison,the solar spectrum reflectivity of the single-layer PDRC coatings based on PVDF and PDMS of the same thickness was 95%and 94.7%,respectively.Outdoor tests showed that the PDRC coating achieved a temperature decrease of up to 7.1℃ under direct sunlight at noon time.In addition,the PDRC coating had excellent weather resistance,water resistance,and other basic properties.This article opens up a new idea and provides methodological guidance for the design of double-layer PDRC coatings. 展开更多
关键词 double-layer radiative cooling coating spectral modulation interlayer refractive index solar energy radiative transfer
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基于身份认证和聚合加密的智能电表数据隐私保护方案 被引量:6
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作者 吴云 吕伟东 +1 位作者 李春哲 滕晓红 《东北电力大学学报》 2018年第5期91-96,共6页
智能电表的使用虽然为供用电双方都提供了诸多便利,但由于存在较频繁的信息流传输,也给智能电网中对用户家庭用电数据的隐私保护工作带来了巨大挑战.为了保证即使数据被窃取,不法者依然无法通过数据对用户的行为信息作出判断,提出了一... 智能电表的使用虽然为供用电双方都提供了诸多便利,但由于存在较频繁的信息流传输,也给智能电网中对用户家庭用电数据的隐私保护工作带来了巨大挑战.为了保证即使数据被窃取,不法者依然无法通过数据对用户的行为信息作出判断,提出了一个基于身份认证和聚合加密的智能电表数据隐私保护方案.方案中对数据的保护分为两个阶段,即数据的读取阶段和聚合加密阶段.读取阶段采用盲签名的方式,保证数据读取过程的安全性;聚合加密阶段采用匿名化处理和Paillier同态加密的方式,实现数据的匿名传输,在提高隐私保护安全强度的同时也大大降低了计算和传输开销.方案实现了在保护用户用电数据不被泄露的同时也避免了因海量数据汇聚而造成的系统拥塞问题. 展开更多
关键词 智能电表 隐私保护 同态加密
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