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Review of research progress on soil moisture sensor technology

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International Journal of Agricultural and Biological Engineering 2021年第4期14卷 32-42页

作者： Limin Yu wanlin gao Redmond R.Shamshiri Sha Tao Yanzhao Ren Yanjun Zhang Guilian Su College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China College of Information Science and Engineering Shandong Agriculture and Engineering UniversityShandong 250100China Leibniz Institute for Agricultural Engineering and Bioeconomy Potsdam-Bornim 14469Germany

Soil moisture is directly related to the amount of irrigation in agriculture and influences the yield of ***,a soil moisture sensor is an important tool for measuring soil moisture *** this study,the previous research conducted in recent 2-3 decades on soil moisture sensors was reviewed and the principles of commonly used soil moisture sensor and their various applications were ***,the advantages,disadvantages,and influencing factors of various measurement methods employed were compared and *** improvements were presented by several scholars have established the major applications and performance levels of soil moisture sensors,thereby setting the course for future *** studies indicated that soil moisture sensors in the future should be developed to achieve high-precision,low-cost,non-destructive,automated,and highly integrated ***,it was indicated that future studies should involve the development of specialized sensors for different applications and *** review research aimed to provide a certain reference for application departments and scientific researchers in the process of selecting soil moisture sensor products and measuring soil moisture.

关键词： soil moisture sensor measurement principle influencing factor improvement method development direction

Identification of damaged corn seeds using air-coupled ultrasound

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International Journal of Agricultural and Biological Engineering 2016年第1期9卷 63-70页

作者： Jin Yanyun gao wanlin Zhang Han An Dong Guo Sihan Saeed Iftikhar Ahmed Liu Yunling College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Institute of Acoustics Chinese Academy of SciencesBeijing 100190China

Corn,an important staple in many countries around the world,is subject to a very inefficient germination rate due to worm-damaged ***,air-coupled ultrasound is a rapid,safe and widely accepted method for the early detection of such *** this study,the current effectiveness and future prospects of this technique for identifying damaged seeds were *** presented procedure started with drawing a sample of 810 seed particles,consisting of 400 that were intact,400 manually damaged and 10 damaged by *** the principal component analysis(PCA)method was used to reduce the dimensions of air-coupling ultrasonic information and extract the top ten principal ***,a KNN decision tree by using SIMCA software and a Fisher recognition model by using MATLAB software were *** pattern recognition was established by using KNN,which has the most accurate recognition *** correct recognition rate of modeling for the front and back data of the intact particles was 98%and 100%,respectively;and for the manually damaged particles,99%and 97%,*** results show that the model developed by using air-coupled ultrasonic data can classify corn seed particles both with and without holes to provide a basis for the development of a seed selection system,which has a significant role in improving the clarity and the germination rate.

关键词： damaged corn seed identification air-coupled ultrasonic principal component analysis KNN

Molten salts-modified MgO-based adsorbents for intermediate-temperature CO_2 capture: A review

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Journal of Energy Chemistry 2017年第5期26卷 830-838页

作者： wanlin gao Tuantuan Zhou Yanshan gao Benoit Louis Dermot O'Hare Qiang Wang College of Environmental Science and Engineering Beijing Forestry University， Beijing 100083 China Laboratoire de Synthese Reactivite Organiques et Catalyse Institut de Chimie UMR 7177 Universite de Strasbourg1 rue Blaise Pascal 67000 StrasbourgFrance Chemistry Research Laboratory Department of Chemistry University of Oxford Mansﬁeld Road Oxford OX1 3TA United Kingdom

Carbon dioxide（CO2） capture using magnesium oxide（MgO）-based adsorbents at intermediate temperatures has been regarded as a very prospective technology for their relatively high adsorption capacity,low cost, and wide availability. During the past few years, great effort has been devoted to the fabrication of molten salts-modified MgO-based adsorbents. The extraordinary progress achieved by coating with molten salts greatly promotes the COcapture capacity of MgO-based adsorbents. Therefore, we feel it necessary to deliver a timely review on this type of COcapturing materials, which will benefit the researchers working in both academic and industrial areas. In this work, we classified the molten saltsmodified MgO adsorbents into four categories:（1） homogenous molten salt-modified MgO adsorbents,（2） molten salt-modified double salts-based MgO adsorbents,（3） mixed molten salts-modified MgO adsorbents, and（4） molten salts-modified MgO-based mixed oxides adsorbents. This contribution critically reviews the recent developments in the synthetic method, adsorption capacity, reaction kinetics, promotion mechanism, operational conditions and regenerability of the molten salts-modified MgO COadsorbents. The challenges and prospects in this promising field of molten salts-modified MgO COadsorbents in real applications are also briefly mentioned.

关键词： Global warming Magnesium oxide CO2 adsorption Molten salts Intermediate temperatures

Effects of microplastic polystyrene,simulated acid rain and arbuscular mycorrhizal fungi on Trifolium repens growth and soil microbial community composition

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Pedosphere 2024年第2期34卷 424-437页

作者： wanlin LI Yan XIAO College of Agro-grassland Science Nanjing Agricultural UniversityNanjing 210095China

Microplastic pollution is a global and ubiquitous environmental problem in the oceans as well as in the terrestrial *** examined the fate of microplastic polystyrene(MPS)beads in experimental soil in the presence and absence of symbiotic arbuscular mycorrhizal fungi(AMF)and simulated acid rain(SAR)to determine whether the combinations of these three factors altered the growth of white clover Trifolium *** found that MPS,SAR,or AMF added singly to soil did not alter *** growth or *** contrast,MPS and AMF together significantly reduced shoot biomass,while SAR and MPS together significantly reduced soil available phosphorus independent of AMF *** polystyrene,AMF,and SAR together significantly reduced soil NO_(3)^(-)-*** mycorrhizal fungi added singly also enriched the beneficial soil bacteria(genus Solirubrobacter),while MPS combined with AMF significantly enriched the potential plant pathogenic fungus *** mycorrhizal fungi inoculation with MPS increased the abundance of soil hydrocarbon degraders independent of the presence of *** addition,the abundance of soil nitrate reducers was increased by MPS,especially in the presence of AMF and ***,SAR alone increased the abundance of soil pathogens within the fungal community including antibiotic *** findings indicate that the coexistence of MPS,SAR,and AMF may exacerbate the adverse effects of MPS on soil and plant health.

关键词： acid deposition arbuscular mycorrhizal fungi symbiosis hydrocarbon degradation microbial alpha diversity microplastic pollution pathogen

凉州区南部山区国储林不同林分土壤抗蚀性研究

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防护林科技 2024年第5期 14-18页

作者：张涛高万林牟德生何彩吴雪茹刘伟张军晋敏武威市林业科学研究院甘肃武威733000 甘肃民勤连古城国家级自然保护区管护中心甘肃武威733000 国家林业局甘肃濒危动物保护中心甘肃武威733000

为揭示武威市凉州区南部山区国储林不同林分土壤的抗蚀特性,以山杏、云杉、樟子松林土壤为研究对象,开展土壤抗蚀指标的测定。结果表明:(1)山杏、樟子松、云杉林地土壤容重随着土壤深度增加而降低。(2)山杏、樟子松和云杉林表层土壤有... 详细信息

为揭示武威市凉州区南部山区国储林不同林分土壤的抗蚀特性,以山杏、云杉、樟子松林土壤为研究对象,开展土壤抗蚀指标的测定。结果表明:(1)山杏、樟子松、云杉林地土壤容重随着土壤深度增加而降低。(2)山杏、樟子松和云杉林表层土壤有机质含量分别为0.91%、1.35%和0.68%,亚层土壤有机质含量分别为1.04%、1.11%和0.76%,第3层土壤有机质含量分别为1.11%、1.54%和0.94%,不同林分土壤有机质含量随着土壤深度增加而增加,樟子松林土壤有机质含量高于山杏林和云杉林。(3)在土壤0~30 cm深度>0.25 mm干筛团聚体平均含量依次为樟子松林地(91.59%)>云杉林地(88.75%)>山杏林地(84.07%),>0.25 mm水稳性团聚体平均含量分别为樟子松林地(21.27%)>云杉林地(9.01%)>山杏林地(2.73%)。(4)3种林分在土壤不同层次结构破坏率表现为山杏林地>云杉林地>樟子松林地,林地土壤抗蚀性表现为樟子松林>云杉林>山杏林。(5)通过相关分析,土壤结构破坏率和>0.25 mm水稳性团聚体含量可作为评价土壤抗蚀性能的较好指标。

关键词：凉州区南部山区不同类型林分土壤抗蚀特性

A simple route for preparation of TRIP-assisted Si-Mn steel with excellent performance using direct strip casting

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2173-2181页

作者： Hui Xu Lejun Zhou wanlin Wang Yang Yi School of Metallurgy and Environment Central South UniversityChangsha 410083China National Center for International Research of Clean Metallurgy Central South UniversityChangsha 410083China

The complex producing procedures and high energy-consuming limit the large-scale production and application of advanced high-strength steels(AHSSs).In this study,the direct strip casting(DSC)technology with unique sub-rapid solidification characteristics and cost advantages was applied to the production of low-alloy Si-Mn steel with the help of quenching&partitioning(Q&P)concept to address these *** this method with the conventional compact strip production(CSP)process,the initial microstructure formed under different solidification conditions and the influence of heat treatment processes on the final mechanical properties were *** results show that the initial structure of the DSC sample is a dual-phase structure composed of fine lath martensite and bainite,while the initial structure of the CSP sample consists of pearlite and *** volume fraction and carbon content of retained austenite(RA)in DSC samples are usually higher than those in CSP samples after the same Q&P *** samples typically demonstrate better comprehensive mechanical properties than the CSP *** DSC sample partitioned at 300℃ for 300 s(DSC-Pt300)achieves the best comprehensive mechanical properties,with yield strength(YS)of 1282 MPa,ultimate tensile strength(UTS)of 1501 MPa,total elongation(TE)of 21.5%,and product of strength and elongation(PSE)as high as 32.3 GPa·%.These results indicate that the excellent mechanical properties in low-alloy Si-Mn steel can be obtained through a simple process(DSC-Q&P),which also demonstrates the superiority of DSC technology in manufacturing AHSSs.

关键词： direct strip casting sub-rapid solidification quenching and partitioning TRIP-assisted AHSSs microstructure

Impact of Atmospheric Transmittance and NLTE Correction on Simulation of High Spectral Infrared Atmospheric Sounder onboard FY-3E

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Journal of Meteorological Research 2024年第2期38卷 225-234页

作者： Chenggege FANG Peiming DONG Yang HAN wanlin KAN Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&TechnologyNanjing 210044 Donghai Laboratory Zhoushan 316021 State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081 CMA Earth System Modeling and Prediction Centre China Meteorological Administration(CMA)Beijing 100081 Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing Joint Institute for Atmospheric SciencesNanjing 210041

With the launch of the first civilian early-morning orbit satellite Fengyun-3E(FY-3E),higher demands are placed on the accuracy of radiative transfer simulations for hyperspectral infrared ***,several key issues are investigated in the ***,the accuracy of the fast atmospheric transmittance model implemented in the Advanced Research and Modeling System(ARMS)has been evaluated with both the line-by-line radiative transfer model(LBLRTM)and the actual satellite *** results indicate that the biases are generally less than 0.25 K when compared to the LBLRTM,while below 1.0 K for the majority of the channels when compared to the ***,during both comparisons,significant biases are observed in certain *** accuracy of Hyperspectral Infrared Atmospheric Sounder-II(HIRAS-II)onboard FY-3E is comparable to,and even superior to that of the Cross-track Infrared Sounder(CrIS)onboard ***,apodization is a crucial step in the processing of hyperspectral data in that the apodization function is utilized as the instrument channel spectral response function to produce the satellite channel-averaged *** further explore the difference between the apodized and unapodized simulations,Sinc function is adopted in the fast transmittance *** is found that the use of Sinc function can make the simulations fit the original satellite observations *** simulating with apodized observations,the use of Sinc function exhibits larger deviations compared to the Hamming ***,a correction module is applied to minimize the impact of Non-Local Thermodynamic Equilibrium(NLTE)in the shortwave infrared *** is verified that the implementation of the NLTE correction model leads to a significant reduction in the bias between the simulation and observation for this band.

关键词： high spectral infrared sounding atmospheric transmittance apodization Non-Local Thermodynamic Equilibrium Fengyun-3E(FY-3E)

Theoretical study on magnetocaloric effect and its electric-field regulation in CrI_(3)/metal heterostructure

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 134-141页

作者： Weiwei He Ziming Tang Qihua Gong Min Yi wanlin Guo State Key Laboratory of Mechanics and Control for Aerospace Structures Key Laboratory for Intelligent Nano Materials and Devices of Ministry of EducationInstitute for Frontier ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China MIIT Key Laboratory of Aerospace Information Materials and Physics College of PhysicsNanjing University of Aeronautics and AstronauticsNanjing 211106China

The extraordinary properties of a heterostructure by stacking atom-thick van der Waals(vdW)magnets have been extensively ***,the magnetocaloric effect(MCE)of heterostructures that are based on monolayer magnets remains to be ***,we deliberate MCE of vd W heterostructure composed of a monolayer CrI_(3)and metal atomic layers(Ag,Hf,Au,and Pb).It is revealed that heterostructure engineering by introducing metal substrate can improve MCE of CrI_(3),particularly boosting relative cooling power to 471.72μJ m^(-2)and adiabatic temperature change to 2.1 K at 5 T for CrI_(3)/*** improved MCE is ascribed to the enhancement of magnetic moment and intralayer exchange coupling in CrI_(3)due to the CrI_(3)/metal heterointerface induced charge *** field is further found to tune MCE of CrI_(3)in heterostructures and could shift the peak temperature by around 10 K in CrI_(3)/Hf,thus manipulating the working temperature window of *** theoretical results could enrich the research on low-dimensional magnetocaloric materials.

关键词： magnetocaloric effect heterostructure metal substrate

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基于区间小波编码的图像混沌加密技术

计算机工程 2006年第16期32卷 203-204,234页

作者：梅树立高万林中国农业大学信息与电气工程学院北京100083

针对图像小波编码混沌加密技术中出现的边界效应问题,提出了基于区间小波编码的混沌加密新技术。相对于传统的图像延拓方法,该方法在小波变换前后,不需要对图像进行特殊的延拓处理,在对图像加密的同时,压缩了图像文件规模,有效地消除了... 详细信息

针对图像小波编码混沌加密技术中出现的边界效应问题,提出了基于区间小波编码的混沌加密新技术。相对于传统的图像延拓方法,该方法在小波变换前后,不需要对图像进行特殊的延拓处理,在对图像加密的同时,压缩了图像文件规模,有效地消除了边界效应。此外,调整参数L的大小,可满足对图像恢复精度的不同要求。实验结果表明,在参数L=1时,信号恢复精度已满足要求。

关键词：区间小波混沌加密边界效应