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Fabrication of Ceramic-Polymer Piezo-Composites with Triply Periodic Minimal Interfaces via Digital Light Processing

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第4期2卷 3-12页

作者： Kai Liu Junchao He Tianyang Li Jiaming Hu yanying Du Yusheng Shi chunzhe yan Zhangwei Chen Shangyu Huang Huajun Sun State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China School of Logistics Engineering Wuhan University of TechnologyWuhan430070China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan430074China Additive Manufacturing Institute Shenzhen UniversityShenzhen518060China

The geometry of the phase interface in co-continuous piezoelectric composites is critical in improving their piezo-electric ***,conventional co-continuous piezoelectric composites are mostly simple structures such as wood stacks or honeycombs,which are prone to stress concentrations at the joints,thus reducing the fatigue service performance and force-electric conversion efficiency of piezoelectric *** simple structures limit further improvements in the overall performance of co-continuous piezoelectric *** this study,based on the digital light processing 3D printing method,we investigated the influence of three dif-ferent structures-the gyroid,diamond,and woodpile interfaces-on the piezoelectric and mechanical properties of co-continuous ceramic/polymer piezoelectric *** findings demonstrate that the gyroid and di-amond interfaces outperformed the ceramic skeleton of the woodpile interface in terms of both mechanical and electrical *** the ceramic volume percentage was 50%,the piezo-composite of the gyroid surface exhibited the greatest hydrostatic figure of merit(HFOM),reaching 4.23×10^(−12) Pa^(−1),and its piezoelectric coeffi-cient(d_(33))and relative dielectric constant(εr)reached 115 pC/N and 748,*** research results lay the foundation for the application of co-continuous piezoelectric composites in underwater communication and detection.

关键词： Additive manufacturing Digital light processing BaTiO_(3) Triply periodic minimal surface Piezoelectric composite

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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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Science China(Technological Sciences) 2024年第10期67卷 3182-3189页

作者： WANG FuQiang LI chunzhe yanG ZhenNing XIE WeiXin LI Xiang XU ZengHui yan YuYing CHENG ZiMing School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China China Construction Eco-Environmental Protection Technology Co. Ltd.Suzhou 215123China Faculty of Engineering University of NottinghamNottingham NG72RDUK

Passive daytime radiative cooling(PDRC)technology has great potential in reducing cooling energy *** 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 *** 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) *** 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”*** 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%,*** tests showed that the PDRC coating achieved a temperature decrease of up to 7.1℃ under direct sunlight at noon *** addition,the PDRC coating had excellent weather resistance,water resistance,and other basic *** article opens up a new idea and provides methodological guidance for the design of double-layer PDRC coatings.

关键词： double-layer radiative cooling coating spectral modulation interlayer refractive index solar energy radiative transfer

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Bio-inspired micropatterned thermochromic hydrogel for concurrent smart solar transmission and rapid visible-light stealth at all-working temperatures

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Light(Science & Applications) 2024年第10期13卷 2201-2211页

作者： Huaxu Liang Xinping Zhang Fuqiang Wang chunzhe Li Weizhe Yuan Weifeng Meng Ziming Cheng yan Dong Xuhang Shi Yuying yan Hongliang Yi Yong Shuai Yi Long School of Energy Science and Engineering Harbin Institute of Technology92 West Dazhi StreetHarbin 150001China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Faculty of Engineering University of NottinghamNottingham NG72RDUK Department of Environmental Engineering Technical University of DenmarkMiljøvej 113KgsLyngby 2800Denmark Department of Electronic Engineering the Chinese University of Hong KongNew TerritoriesHong Kong SARChina

Thermochromic hydrogels exhibit a smart capacity for regulating solar spectrum transmission,enabling automatically change their transmissivity in response to the ambient temperature *** has great importance for energy conservation *** and civilian emergency thermochromic applications require rapid visible-light stealth(VLS);however,concurrent smart solar transmission and rapid VLS is yet to be *** by squid-skin,we propose a micropatterned thermochromic hydrogel(MTH)to realize the concurrent control of smart solar transmittance and rapid VLS at all-working *** MTH possesses two optical regulation mechanisms:optical property regulation and optical scattering,controlled by temperature and pressure,*** introduced surface micropattern strategy can arbitrarily switch between normal and diffuse transmission,and the VLS response time is within 1 s compared with previous~180 *** MTH also has a high solar-transmission regulation range of 61%.Further,the MTH preparation method is scalable and *** novel regulation mechanism opens a new pathway towards applications with multifunctional optical requirements.

关键词： visible hydrogel ambient

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EPON无源光网络在配电自动化系统中的应用

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内蒙古电力技术 2015年第1S期33卷 42-45页

作者：闫润怀唐春喆张瑜内蒙古电力集团有限责任公司呼和浩特010020 包头供电局九原供电分局内蒙古包头014060

介绍了包头市九原电力有限责任公司配电自动化系统中EPON无源光网络的配置情况。对EPON无源光网络结构、组网模式及技术特点进行了分析。分析认为，EPON技术实现简单，成本低廉，组网灵活，运行稳定，安全可靠，将EPON以太网无源光网络... 详细信息

介绍了包头市九原电力有限责任公司配电自动化系统中EPON无源光网络的配置情况。对EPON无源光网络结构、组网模式及技术特点进行了分析。分析认为，EPON技术实现简单，成本低廉，组网灵活，运行稳定，安全可靠，将EPON以太网无源光网络技术引入配电自动化系统，能够为配电自动化提供可靠的通信保障，提高企业的供电能力和供电可靠性，具有推广应用价值。

关键词： EPON技术配电网配电自动化系统组网模式

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小儿支原体肺炎血Th17/Treg细胞失衡与心肌损害发生的相关性

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西部医学 2023年第12期35卷 1822-1825页

作者：国春柘成芳薛乔孙世心赵英免南艳安红邢台市人民医院儿科河北邢台054000 河北大学附属医院结核科河北保定071000

目的探讨小儿支原体肺炎血Th17/调节性T细胞(Treg)失衡与心肌损害发生的相关性。方法选择2020年3月—2022年3月于邢台市人民医院就诊的支原体肺炎患儿137例作为观察对象,通过肌酸激酶同工酶(CK-MB)水平,影像学检查及心电图表现等判定心... 详细信息

目的探讨小儿支原体肺炎血Th17/调节性T细胞(Treg)失衡与心肌损害发生的相关性。方法选择2020年3月—2022年3月于邢台市人民医院就诊的支原体肺炎患儿137例作为观察对象,通过肌酸激酶同工酶(CK-MB)水平,影像学检查及心电图表现等判定心肌损害,并根据是否发生心肌损害将患儿分为心肌损害组和无心肌损害组。另选择同期健康体检儿童96例作为对照组。采用流式细胞仪测定Th17细胞和Treg细胞占CD4^(+)T细胞比例;采用全自动生化分析仪测定乳酸脱氢酶(LDH)、肌酸激酶(CK)和CK-MB水平。比较各组Th17细胞占CD4^(+)T细胞比例、Treg细胞占CD4^(+)T细胞比例、Th17/Treg和心肌酶水平变化。采用Pearson相关性分析Th17/Treg与心肌酶相关性。结果137例支原体肺炎患儿中,发生心肌损害72例(52.55%)。心肌损害组血清LDH、CK和CK-MB水平高于无心肌损害组和对照组,且无心肌损害组血清LDH、CK和CK-MB水平高于对照组(P<0.05)。心肌损害组Th17细胞占CD4^(+)T细胞比例和Th17/Treg高于无心肌损害组和对照组,且Treg细胞占CD4^(+)T细胞比例低于无心肌损害组和对照组(P<0.05)。Pearson相关性分析结果显示,Th17/Treg与LDH、CK和CK-MB呈正相关(P<0.05)。结论小儿支原体肺炎并发心肌损害患儿心肌酶谱LDH、CK和CK-MB水平明显升高,Th17/Treg细胞比例失衡,且Th17/Treg与LDH、CK和CK-MB呈正相关。

关键词：小儿支原体肺炎 Th17/Treg细胞失衡心肌损害

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