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Multiple Nanoparticles Coupling Strategy for Enhancing Optical Filter Performance of Spectral Splitter Used in Photovoltaic/Thermal System

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Journal of Thermal Science 2024年第1期33卷 368-382页

作者： LIANG Huaxu HUANG Xin WANG Fuqiang cheng ziming DONG Yan School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

Selective absorptive nanofluid can pre-absorb certain sunlight wavelength that cannot be used by PV and transmits remaining sunlight to the surface of PV,which can decouple PV from the thermal receiver *** order to improve the harvesting of electricity and high-temperature thermal nanofluid,it is important to design an optimal optical filter window(transmit sunlight with wavelengths of 732-1067 nm to the surface of the photovoltaic cell and absorb the remaining sunlight).However,designing optimal optical filter is facing following challenges:(1) inherently narrow selective absorptivity property of single nanoparticle;(2) simplified numerical calculation method calculating transmittance;(3) ignoring the shape of the *** this study,the idea of using multiple nanoparticles coupling effect to design an optical filter is proposed,which can superimpose the narrow absorption bandwidth of different nanoparticles to obtain a wide absorption bandwidth of the whole *** addition,an improved transmission method considering light-matter interaction at air/vessel and liquid/vessel interfaces is adopted to compute the *** results calculated by improved transmission method are more accurate than widely used traditional Lambert-Beer law,which is verified by experimental ***,the effect of nanoparticle shape on spectral transmittance is also investigated,which shows that spiny Ag can approximately extend absorbance from 400 nm to 600 nm compared to nanosphere ***,the results show that optical filter efficiency of nanofluids with multiple nanoparticles coupling(Ag,spiny Ag,ZnO,ITO) can reached up to 35%.

关键词： solar energy PV/T nanofluid optimal optical filter radiative transfer spectral splitting

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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 Technology School of New Energy Harbin Institute of Technology at Weihai China Construction Eco-Environmental Protection Technology Co. Ltd. Faculty of Engineering University of Nottingham

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 Al2O3and SiO2particles. 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.

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

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AGM隔板的装配压力对阀控式铅酸蓄电池性能的影响

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蓄电池 2024年第3期61卷 142-146页

作者：成梓铭沈阳蓄电池研究所有限责任公司沈阳辽宁110178

研究了AGM隔板的注液量、注液种类、纤维直径、增强隔板以及初始压力等因素对装配压力的影响。实验证明,注液量为饱和吸液量的90%,装配压力控制在60 kPa左右,可以明显改善阀控式铅酸蓄电池的循环寿命。

关键词：阀控式铅酸蓄电池饱和吸酸量 AGM 隔板注液量注液种类纤维直径初始压力回弹性装配压力

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姜黄素脂质包裹纳米粒的制备及药动学研究

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中国医药工业杂志 2024年第6期55卷 837-843页

作者：程子明薛雪同方药业集团有限公司北京102100 悦康药业集团股份有限公司北京100176

制备了基于脂质包裹中空介孔二氧化硅纳米粒的姜黄素递药系统(CUR-HMSN@lip),对其处方工艺参数进行优化,并考察了在大鼠体内的药动学行为。采用TEM、PXRD、ζ电位和热重分析法对CUR-HMSN@lip进行表征,结果说明负载姜黄素的中空介孔二氧... 详细信息

制备了基于脂质包裹中空介孔二氧化硅纳米粒的姜黄素递药系统(CUR-HMSN@lip),对其处方工艺参数进行优化,并考察了在大鼠体内的药动学行为。采用TEM、PXRD、ζ电位和热重分析法对CUR-HMSN@lip进行表征,结果说明负载姜黄素的中空介孔二氧化硅纳米粒(CUR-HMSN)成功被磷脂包裹。口服给予大鼠CUR-HMSN@lip后,tmax为(1.83±0.41)h,AUClast为(570.82±48.07)h·ng·mL–1,MRTlast为(5.68±1.21)h;与CUR-HMSN处理组相比,CUR-HMSN@lip处理组的药-时曲线未出现双峰现象;CUR-HMSN@lip的相对生物利用度为203.8%。该研究表明,CUR-HMSN@lip递药系统能提高姜黄素的生物利用度,改善CUR-HMSN的突释现象。

关键词：磷脂中空介孔二氧化硅纳米粒姜黄素递药系统突释生物利用度

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铅酸蓄电池用排管电阻的测量不确定度评定

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蓄电池 2024年第4期61卷 188-190页

作者：成梓铭栾云东杨峰沈阳蓄电池研究所有限责任公司辽宁沈阳110178

介绍了排管电阻的测量不确定度评定方法。通过分析排管电阻的测试过程,建立了电阻测量的数学模型,确定了测量不确定度的来源。采用A、B类评定方法对各因素引起的不确定度分量、合成标准不确定度和扩展不确定度进行评定,并给出评定结果。

关键词：铅酸蓄电池排管电阻标准不确定度扩展不确定度重复测量

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Optical properties and cooling performance analyses of single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles

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Science China(Technological Sciences) 2021年第5期64卷 1017-1029页

作者： cheng ziming SHUAI Yong GONG DaYang WANG FuQiang LIANG HuaXu LI GuiQiang School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China Key Laboratory of Aerospace Thermophysics Ministry of Industry and Information TechnologyHarbin 150001China School of Engineering University of HullHull HU67RXUK

Radiative cooling can achieve cooling effect without consuming any energy by delivering energy into outer space(3K) through"atmospheric window"(8–13 μm). Conventional radiative cooling coating with multi-layer structure was severely restricted during application due to its complex preparation process and high cost. In this study, a single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles was proposed. The algorithm for calculating the radiative properties of the multi-particle system was developed. Monte Carlo ray-tracing method combined with that algorithm was used to solve the radiative transfer equation(RTE) of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) *** effects of particle diameter, volume fraction and coating thickness on radiative cooling performance were analyzed to obtain the best radiative cooling performance. The numerical results indicated that the average reflectivity of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles in the solar spectrum can reach 95.6%, while and the average emissivity in the "atmospheric window" spectrum can reach 94.9% without additional silver-reflectance layer. The average reflectivity in the solar spectrum and average emissivity in the "atmospheric window" spectrum of the single-layer radiative cooling coating with mixture of TiO_(2) particles and SiO_(2) particles can increase 4.6% and 4.8% compared to the double-layer radiative cooling coating. This numerical research results can provide a theoretical guidance for design and optimization of single-layer radiative cooling coatings containing mixed nanoparticles.

关键词： radiative cooling optical property multi-particles cooling performance radiative transfer atmospheric window

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Compressed Least Squares Algorithm of Continuous-Time Linear Stochastic Regression Model Using Sampling Data

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Journal of Systems Science & Complexity 2024年第4期37卷 1488-1506页

作者： XIE Siyu ZHANG Shujun WANG ziming GAN Die School of Aeronautics and Astronautics University of Electronic Science and Technology of ChinaChengdu 611731China China Academy of Aerospace Science and Innovation Beijing 100176China Zhongguancun Laboratory Beijing 100094China

In this paper,the authors consider a sparse parameter estimation problem in continuoustime linear stochastic regression models using sampling *** on the compressed sensing(CS)method,the authors propose a compressed least squares(LS) algorithm to deal with the challenges of parameter *** each sampling time instant,the proposed compressed LS algorithm first compresses the original high-dimensional regressor using a sensing matrix and obtains a low-dimensional LS estimate for the compressed unknown ***,the original high-dimensional sparse unknown parameter is recovered by a reconstruction *** introducing a compressed excitation assumption and employing stochastic Lyapunov function and martingale estimate methods,the authors establish the performance analysis of the compressed LS algorithm under the condition on the sampling time interval without using independence or stationarity conditions on the system *** last,a simulation example is provided to verify the theoretical results by comparing the standard and the compressed LS algorithms for estimating a high-dimensional sparse unknown parameter.

关键词： Compressed excitation condition compressed sensing continuous-time model least squares linear stochastic regression parameter identification sampling data

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一种顾及视觉层次的电子地图自适应节能显示方法

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测绘学报 2023年第11期52卷 1983-1993页

作者：吴明光成梓铭南京师范大学地理科学学院江苏南京210023 南京师范大学虚拟地理环境教育部重点实验室江苏南京210023 江苏省地理信息资源开发与利用协同创新中心江苏南京210023

电子地图显示能耗过高是当前地图设计与应用领域亟须解决的问题之一。针对现有电子地图节能显示方法难以保持视觉层次的问题,本文归纳了地图颜色的3种视觉层次结构,设计了视觉层次的定量表达模型,提出了一种电子地图自适应节能显示优化... 详细信息

电子地图显示能耗过高是当前地图设计与应用领域亟须解决的问题之一。针对现有电子地图节能显示方法难以保持视觉层次的问题,本文归纳了地图颜色的3种视觉层次结构,设计了视觉层次的定量表达模型,提出了一种电子地图自适应节能显示优化方法。本文方法同时考虑视觉层次质量和地图能耗,将地图节能问题定义为一个“质量-能耗”双目标优化问题,利用启发式搜索算法寻找节能配色方案,在轻微改变地图外观的情况下显著降低显示能耗。将本文方法与语义约束的颜色调整方法进行对比,采用不同比例尺的电子地图设计读图试验。结果表明,本文方法在有效性、效率、颜色一致性方面均优于对比方法,可广泛应用于电子地图、移动导航地图的节能显示,提高设备的续航能力。

关键词：视觉层次颜色能量消耗电子地图视觉层次质量

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The FAST all sky HI survey(FASHI):The first release of catalog

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 112-133页

作者： Chuan-Peng Zhang Ming Zhu Peng Jiang cheng cheng Jing Wang Jie Wang Jin-Long Xu Xiao-Lan Liu Nai-Ping Yu Lei Qian Haiyang Yu Mei Ai Yingjie Jing Chen Xu ziming Liu Xin Guan Chun Sun Qingliang Yang Menglin Huang Qiaoli Hao FAST Collaboration Guizhou Radio Astronomical Observatory Guizhou UniversityGuiyang 550000China National Astronomical Observatories Chinese Academy of Sciences(CAS)Beijing 100101China Chinese Academy of Sciences South America Center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

The FAST All Sky HI survey(FASHI)was designed to cover the entire sky observable by the Five-hundred-meter Aperture Spherical radio Telescope(FAST),spanning approximately 22000 square degrees of declination between-14°and+66°,and in the frequency range of 1050-1450 MHz,with the expectation of eventually detecting more than 100000 HI *** August 2020 and June 2023,FASHI had covered more than 7600 square degrees,which is approximately 35%of the total sky observable by *** has a median detection sensitivity of around 0.76 m Jy beam-1and a spectral line velocity resolution of~6.4 km s-1at a frequency of~1.4 *** of now,a total of 41741 extragalactic HI sources have been detected in the frequency range 1305.5-1419.5 MHz,corresponding to a redshift limit of z■*** cross-matching FASHI sources with the Siena Galaxy Atlas(SGA)and the Sloan Digital Sky Survey(SDSS)catalogs,we found that 16972(40.7%)sources have spectroscopic redshifts and 10975(26.3%)sources have only photometric *** of the remaining 13794(33.0%)HI sources are located in the direction of the Galactic plane,making their optical counterparts difficult to identify due to high extinction or high contamination of Galactic stellar *** on current survey results,the FASHI survey is an unprecedented blind extragalactic H I *** has higher spectral and spatial resolution and broader coverage than the Arecibo Legacy Fast ALFA Survey(ALFALFA).When completed,FASHI will provide the largest extragalactic HI catalog and an objective view of HI content and large-scale structure in the local universe.

关键词： surveys redshifts galaxies telescope radio lines HI line

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焦化粗苯蒸馏工段加热工艺改进工程实践

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煤化工 2021年第4期49卷 67-69页

作者：程子明河钢集团邯钢公司邯宝焦化厂河北邯郸056015

针对焦化厂粗苯蒸馏工段管式炉加热工艺存在的外排烟气SO_(2)超标问题,采用干熄焦副产中压过热蒸汽为热源替代管式炉工艺对富油进行加热改造。介绍了改造前后粗苯蒸馏工艺流程,比较了两种工艺的运行费用,分析了改造后运行效果。两种工... 详细信息

针对焦化厂粗苯蒸馏工段管式炉加热工艺存在的外排烟气SO_(2)超标问题,采用干熄焦副产中压过热蒸汽为热源替代管式炉工艺对富油进行加热改造。介绍了改造前后粗苯蒸馏工艺流程,比较了两种工艺的运行费用,分析了改造后运行效果。两种工艺运行费用相当,改造解决了粗苯工段管式炉烟气排放超标问题,同时可稳定粗苯系统操作,降低洗油消耗,提高生产安全性。生产运行实践表明,改造后年可减排SO_(2)17.08 t,节约洗油消耗333 t,降低生产成本164.84万元。

关键词：粗苯蒸馏富油管式炉干熄焦过热蒸汽烟气二氧化硫

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