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荒漠草原区土壤水分ELM-ESTARFM遥感反演模型构建与应用

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干旱地区农业研究 2024年第3期42卷 236-244页

作者：王欢李瑞平王福强赵建伟苗存立籍晓婧内蒙古农业大学水利与土木建筑工程学院内蒙古呼和浩特010018 赤峰市克什克腾旗自然资源局内蒙古赤峰025350 内蒙古自治区测绘地理信息中心内蒙古呼和浩特010018

土壤水分的高时空分辨率和高精度评估对干旱监测具有重要意义。为探究我国内蒙古荒漠草原区土壤水分遥感反演最优模型,基于Landsat和MODIS数据进行改进型自适应反射率时空融合(Enhanced Spatial and Temporal Adaptive Reflectance Fusi... 详细信息

土壤水分的高时空分辨率和高精度评估对干旱监测具有重要意义。为探究我国内蒙古荒漠草原区土壤水分遥感反演最优模型,基于Landsat和MODIS数据进行改进型自适应反射率时空融合(Enhanced Spatial and Temporal Adaptive Reflectance Fusion Model,ESTARFM),结合下垫面因子、地形因子、气象因子、植被因子等多要素环境因子,通过极限学习机(Extreme learning machine,ELM)和随机森林(Random forest,RF)两种方法构建土壤含水率反演模型,并与Landsat(未进行融合)构建的土壤含水率反演模型进行对比,最终筛选得到最优土壤含水率反演模型,并对研究区不同土地利用类型土壤含水率分布特征进行应用分析。结果表明:归一化植被指数是土壤含水率环境因子相关分析中最重要的预测因子(0~10、10~20、20~30 cm土壤深度处R^(2)=0.85、0.82、0.79),其次为降水量(R^(2)=0.73、0.68、0.71)、高程(R^(2)=0.71、0.70、0.71)、水体指数(R^(2)=0.69、0.69、0.68)、归一化盐分指数(R^(2)=0.68、0.67、0.65)。与未进行时空融合所构建的模型相比,利用ESTARFM时空融合所构建的模型精度均有所提升,考虑ESTARFM时空融合时,ELM模型的R^(2)、RMSE、MAE分别为0.89、6.58%、3.93%,RF模型的R^(2)、RMSE、MAE分别为0.78、7.25%、4.95%;未考虑ESTARFM时空融合时,ELM模型的R^(2)、RMSE、MAE分别为0.75、7.37%、5.24%,RF模型的R^(2)、RMSE、MAE分别为0.71、7.48%、5.30%。表明ELM模型比RF模型的土壤含水率反演效果更好,且ELM-ESTARFM为土壤含水率反演最优模型。在此基础上,运用改进后的ELM-ESTARFM遥感反演模型监测了乌审旗全域土壤含水率,发现研究区北部和西北部的土壤含水率较高,南部地区的土壤含水率较低;对于不同土壤深度,土壤含水率由大到小依次为耕地、林地、草地、沙地,耕地区域0~10、10~20、20~30 cm土层含水率分别为18.92%、19.34%、21.84%,林地为11.80%、11.87%、12.40%,草地为10.97%、11.02%、12.22%,沙地为5.07%、5.35%、5.67%。

关键词：土壤水分环境因子极限学习机随机森林

The influence of lipid-extraction on theδ^(13)C of mesopelagic and demersal fish in the South China Sea:modification and application of lipid normalization models

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Acta Oceanologica Sinica 2023年第1期42卷 35-43页

作者： Linyu wang fuqiang wang Zuozhi Chen Ying Wu State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai200241China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao266237China South China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhou100141China

Mesopelagic fish,the most important daily vertically migrating community in the oceans,are characterized by high lipid content which may obscure the interpretation of stable isotopes *** fish,which are important consumers in the food web dominated by mesopelagic fish,also have a high lipid *** we collected 127 fish samples from the South China Sea and evaluated the effect of lipid contents on△δ^(13)C of mesopelagic and demersal *** lipid-extracted mesopelagic fish,the C/N content ratio(<5.5)shows a clear correlation withΔδ^(13)C(the offset of bulk and lipid-extractedδ^(13)C values),especially in non-migratory and semi-migratory species;these values were less correlation in demersal *** on our results,we suggest that mesopelagic and demersal fish in different regions of the South China Sea should be studied separately using appropriate correction models and less fit for the traditional ***,the C/N content ratio should be used cautiously for establishing the lipid normalization model,especially for the fish in migratory mesopelagic fish and demersal *** results also reveal that mesopelagic fish across nearby regions could be analyzed *** new models described here can be applied in future studies of mesopelagic and demersal fish in the South China Sea.

关键词： mesopelagic fish demersal fish lipid normalization model C/N content ratio lipid content δ13C South China Sea

问题与路向:精准思政赋能高校思政课课堂教学

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西安文理学院学报（社会科学版） 2024年第1期27卷 15-21页

作者：王富强刘皓然河北工业大学马克思主义学院天津300401

精准思政是思想政治教育发展的必然结果,也是思想政治教育精细化的必然选择。精准思政以精准思维为指引,以立德树人为根本目标,具有实事求是、问题导向同目标导向相结合和供需平衡三个基本特征。在精准思政视角下,高校思政课面临课堂教... 详细信息

精准思政是思想政治教育发展的必然结果,也是思想政治教育精细化的必然选择。精准思政以精准思维为指引,以立德树人为根本目标,具有实事求是、问题导向同目标导向相结合和供需平衡三个基本特征。在精准思政视角下,高校思政课面临课堂教学供给与学生需求存在一定的偏失、课堂教学内容与课程教学目标存在一定的偏离、课堂教学效果与党和人民的期待存在一定的偏差等现实困境。精准思政旨在以精准思维提升高校思政课育人效能,破除高校思政课所面临的现实困境,建设有料、有趣、有情、有高度、有深度、有效度的“六有课堂”。

关键词：精准思政思政课思想政治教育教学方法

Numerical study on the thermal performance of packed-bed latent heat thermal energy storage system with biomimetic alveoli structure capsule

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Science China(Technological Sciences) 2021年第7期64卷 1544-1554页

作者： wang fuqiang DONG Yan LI Yang XU Jie ZHANG GuoLiang School of Physics Harbin Institute of TechnologyHarbin150001China School of New Energy Harbin Institute of TechnologyWeihai264209China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin150001China College of Petroleum Engineering Liaoning Shihua UniversityFushun113001China

Bionics provides a positive and beneficial impact on the development of various materials and systems, which has been widely used in energy storage, heat transfer enhancement, and solar thermochemical reactions. In this paper, the idea of heat storage unit with biomimetic alveoli structure is proposed and introduced to increase the heat transfer area and improve the thermal performance of the packed-bed latent heat thermal energy storage(LHTES) system. The effects of heat storage unit structure on temperature distribution, liquid fraction, thermal storage capacity, and other performance indexes of the conventional model and biomimetic model are analyzed. The numerical results indicate that the biomimetic alveoli structure can improve the thermal response of heat storage unit, increase the specific surface area, and achieve a faster heat storage process of the packed-bed compared with the conventional structure. Among various existing models, the double-cell model has a significant *** with the conventional model, the maximum increase of liquid fraction and charging efficiency are 9.8% and 6.4%,respectively. This study can provide references to optimize packed-bed LHTES and improve its thermal performance under practical conditions.

关键词： solar energy thermal energy storage packed bed biomimetic alveoli phase change material

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

Thermal Performance Analysis of PCM Capsules Packed-Bed System with Biomimetic Leaf Hierarchical Porous Structure

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Journal of Thermal Science 2021年第5期30卷 1559-1571页

作者： DONG Yan wang fuqiang YANG Luwei SHI Xuhang ZHANG Guoliang SHUAI Yong School of New Energy Harbin Institute of Technology at WeihaiWeihai 264209China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China

As an efficient natural selection nutrient transport system,biomimetic leaf hierarchical porous structure has unique advantages in material transportation and energy *** leaf hierarchical porous structure has been widely used in solar thermochemical reactions,photocatalysis,and energy *** improve the thermal efficiency and reduce the power consumption,the authors introduce the idea of bionic leaf hierarchical porous structure packed-bed latent heat thermal energy storage(LHTES)*** the same porosity,the diameter of the PCM capsules is designed to change along the flow direction to optimize the thermal *** effects of velocity on temperature distribution,pressure drop,liquid fraction,and thermal storage capacity of the conventional uniform model and bionic leaf hierarchical porous model are *** results show that the bionic leaf hierarchical porous structure can thin the thickness of the thermocline,reduce the pressure drop,increase the heat transfer area,and improve the thermal response of the packed-bed compared with the conventional uniform *** maximum increases of liquid fraction and completion rate are 36.6%and 20.3%with pressure drop reduction of 25 Pa,*** maximum decrease of the above-melting point(MP)thermocline is 51.7%as *** results provide suggestions to optimize the packed-bed LHTES system and improve its thermal performance under practical conditions.

关键词： solar energy thermal energy storage packed bed biomimetic phase change hierarchical porous structure

Model Free Adaptive Predictive Control of Desulfurization Slurry pH Based on CPS Framework

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Journal of Beijing Institute of Technology 2020年第4期29卷 544-555页

作者： Jian Liu Xiaoli Li Kang wang fuqiang wang Guimei Cui Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Ministry of EducationBeijing 100124China Beijing Advanced Innovation Center for Future Internet Technology Beijing University of TechnologyBeijing 100124China Technology Research Center Shenhua Guohua(Beijing)Electric Power Research Institute CorporationBeijing 100025China School of Information Engineering Inner Mongolia University of Science and TechnologyBaotou 014010China

In order to improve the slurry pH control accuracy of the absorption tower in the wet flue gas desulfurization process,a model free adaptive predictive control algorithm for the desulfurization slurry pH which is based on a cyber physical systems framework is ***,aiming to address system characteristics of non-linearity and pure hysteresis in slurry pH change process,a model free adaptive predictive control algorithm based on compact form dynamic linearization is proposed by combining model free adaptive control algorithm with model predictive control ***,by integrating information resources with the physical resources in the absorption tower slurry pH control process,an absorption tower slurry pH optimization control system based on cyber physical systems is *** is turned out that the model free adaptive predictive control algorithm under the framework of the cyber physical systems can effectively realize the high-precision tracking control of the slurry pH of the absorption tower,and it has strong robustness.

关键词： wet flue gas desulfurization slurry pH cyber physical systems model free adaptive predictive control tracking control

Double-directional control bolt support technology and engineering application at large span Y-type intersections in deep coal mines

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Mining Science and Technology 2010年第2期20卷 254-259页

作者： GUO, Zhibiao SHI, Jianjun wang, Jiong CAI, Feng wang, fuqiang state key laboratory of geomechanics and deep underground engineering beijing 100083china institute of geotechnical engineering china university of mining & technologybeijing 100083china safety engineering college north china university of science & technologybeijing 101601china

Under deep and complex geological conditions,severe deformation occurs at intersection points of Y-type roadways with large cross sections during engineering projects in coal mines,especially at junction *** on in-situ investigations and theoretical studies,we have summarized typical forms of destruction and identified high stress and unrestricted support at both sides of junction arch as its main *** this study,we also presented double-directional control bolt support technology for a large Y-type span intersection,applied to deep intersection engineering in the Jiahe Coal Mine,which has proved effective.

关键词： Y-type intersection double-directional control bolt support deep coal mines

Water permeability in MXene membranes: Process matters

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Chinese Chemical Letters 2020年第6期31卷 1665-1669页

作者： Hang Zhou Yuwei wang fuqiang wang Hao Deng Yongchen Song Changping Li Zheng Ling Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy&Power EngineeringDalian University of TechnologyDalian 116024China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China

Recent studies have shown impressive transport behaviors of water and ions within lamellar MXene membranes,which endows great promise in developing advanced separation application based high performance MXene ***,most of the researches focused on modification of MXene nanoflakes and optimizing interlayer distance,leaving the impact of membrane fabrication process *** this work,we studied the water flux of membranes made by vacuum filtration using delaminated MXene nanoflakes as the *** results show that the water permeability is extremely sensitive to the process,especially at the drying process,loading and deposit rate of nanoflakes(the feeding concentration).We find that the voids from less ordered stack rather than in-plane defects and interlayer galleries contribute to the large water *** voids can be effectively avoided via deposition of MXene nanoflakes at a slow *** the stack of MXene nanoflakes during vacuum filtration and drying are critical for development of MXene membranes with desired performance for water permeation.

关键词： Exfoliation MXene Two-dimensional materials Water permeability Water treatment