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Object Counting Using a Refinement Network

Tsinghua Science and Technology 2022年第5期27卷 869-879页

作者： Lehan Sun Junjie Ma Liping Jing School of Science Beijing Jiaotong UniversityBeijing 100044China Department of Computer Science and Technology and Beijing National Research Center for Information Science and Technology(BNRist)Tsinghua UniversityBeijing 100084China School of Computer and Information Technology Beijing Jiaotong UniversityBeijing 100044China

To address the scale variance and uneven distribution of objects in scenarios of object-counting tasks,an algorithm called Refinement Network(RefNet) is *** proposed top-down scheme sequentially aggregates multiscale features,which are laterally connected with low-level *** by a multiresolution density regression loss,a set of intermediate-density maps are estimated on each scale in a multiscale feature pyramid,and the detailed information of the density map is gradually added through coarse-to-fine granular refinement progress to predict the final density *** evaluate our RefNet on three crowd-counting benchmark datasets,namely,ShanghaiTech,UCFC0,and UCSD,and our method achieves competitive performances on the mean absolute error and root mean squared error compared to the state-of-the-art *** further extend our RefNet to cell counting,illustrating its effectiveness on relative counting tasks.

关键词： object counting Refinement Network(RefNet) scale variation uneven distribution

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Readsorption of rare earth elements during leaching process of ion-adsorption-type rare earth ore

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Rare Metals 2023年第6期42卷 2113-2120页

作者： Li Wang Chao Wang Liu Li You-Ming Yang School of Metallurgy and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou341000China

A leaching experiment on simulated rare earth ore pillars with uneven grade distribution was conducted because of the readsorption of rare earth elements in the in situ leaching process of ion-adsorption-type rare earth *** show that the readsorption of rare earth elements in the barren layer is the main reason for the decrease in rare earth concentration in the leachate,decrease in rare earth recovery and extension of the leaching *** limitation could be affected by the concentration of rare earth of the influent flow passing through the barren ore layer,and pH value of leaching agents shows minimal effect during *** magnesium sulfate leaching process requires higher liquid-tosolid ratio than the ammonium sulfate leaching *** former also has lower peak value of rare earth concentration and more significant tailing in the leaching *** readsorption of rare earth elements in the barren layer is more severe in magnesium sulfate leaching than in ammonium sulfate ***,areas without ore belts should be avoided when magnesium sulfate is used for leaching.

关键词： Ion-adsorption-type rare earth ore Readsorption Leaching process uneven distribution

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