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An image segmentation method of pulverized coal for particle size analysis

International Journal of Mining Science and Technology 2023年第9期33卷 1181-1192页

作者： Xin Li Shiyin Li Liang Dong Shuxian Su Xiaojuan Hu Zhaolin Lu Affiliated Hospital of China University of Mining and Technology Xuzhou 221002China School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering&Technology China University of Mining and TechnologyXuzhou 221116China Advanced analysis and Computation Center China University of Mining and TechnologyXuzhou 221116China

An important index to evaluate the process efficiency of coal preparation is the mineral liberation degree of pulverized coal,which is greatly influenced by the particle size and shape distribution acquired by image ***,the agglomeration effect of fine powders and the edge effect of granular images caused by scanning electron microscopy greatly affect the precision of particle image *** this study,we propose a novel image segmentation method derived from mask regional convolutional neural network based on deep learning for recognizing fine coal ***,an atrous convolution is introduced into our network to learn the image feature of multi-sized powders,which can reduce the missing segmentation of small-sized agglomerated ***,a new mask loss function combing focal loss and dice coefficient is used to overcome the false segmentation caused by the edge *** final comparative experimental results show that our method achieves the best results of 94.43%and 91.44%on AP50 and AP75 respectively among the comparison *** addition,in order to provide an effective method for particle size analysis of coal particles,we study the particle size distribution of coal powders based on the proposed image segmentation method and obtain a good curve relationship between cumulative mass fraction and particle size.

关键词： Pulverized coal Image segmentation Deep learning particle size analysis

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Determination of the suspension competence of debris flows based on particle size analysis

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International Journal of Sediment Research 2014年第1期29卷 73-81页

作者： Hong-juan YANG Fang-qiang WEI Kai-heng HU Chuan-chang WANG Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences

The determination of the critical particle size between solid and fluid phases,i.e.,the suspension competence,is fundamental for debris flow.A method for determining suspension competence based on particle size analysis is presented in this *** competence of static experimental water-debris mixtures prepared with the sediment of Jiangjia Gully is-0.025 mm if the bulk density is less than 1,800 kg m;and it increases with bulk density of more concentrated *** competence of natural debris flows in Jiangjia Gully increases exponentially with the bulk *** two data sets are compared in order to understand the suspension *** is concluded that turbulence may play a leading role in particle suspension in non-viscous and sub-viscous debris flows,while in viscous debris flows both matrix strength and excess pore water pressure play important roles.

关键词： Debris flow Suspension competence particle size analysis Critical particle size particle suspension mechanism

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Electrochemical performance of a nickel-rich LiNi0.6Co0.2Mn0.2O2 cathode material for lithium-ion batteries under different cut-off voltages

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International Journal of Minerals,Metallurgy and Materials 2017年第3期24卷 342-351页

作者： Kai-lin Cheng Dao-bin Mu Bo-rong Wu Lei Wang Ying Jiang Rui Wang Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081 China

A spherical-like Ni0.6Co0.2Mn0.2(OH)2precursor was tuned homogeneously to synthesize LiNi0.6Co0.2Mn0.2O2as a cathode material for lithium-ion batteries. The effects of calcination temperature on the crystal structure, morphology, and the electrochemical performance of the as-prepared LiNi0.6Co0.2Mn0.2O2were investigated in detail. The as-prepared material was characterized by X-ray diffraction, scanning electron microscopy, laser particle size analysis, charge–discharge tests, and cyclic voltammetry measurements. The results show that the spherical-like LiNi0.6Co0.2Mn0.2O2material obtained by calcination at 900°C displayed the most significant layered structure among samples calcined at various temperatures, with a particle size of approximately 10 μm. It delivered an initial discharge capacity of 189.2 mAh•g−1at 0.2C with a capacity retention of 94.0% after 100 cycles between 2.7 and 4.3 V. The as-prepared cathode material also exhibited good rate performance, with a discharge capacity of 119.6 mAh•g−1at 5C. Furthermore, within the cut-off voltage ranges from 2.7 to 4.3, 4.4, and 4.5 V, the initial discharge capacities of the calcined samples were 170.7, 180.9, and 192.8 mAh•g−1, respectively, at a rate of 1C. The corresponding retentions were 86.8%, 80.3%, and 74.4% after 200 cycles, respectively. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Calcination Cathodes Cobalt Crystal structure Cyclic voltammetry Electric batteries Electric discharges Electrochemical properties Electrodes Ions Lithium Lithium alloys Lithium compounds Manganese Nickel particle size particle size analysis Scanning electron microscopy Secondary batteries X ray diffraction

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Optimization of regularization parameter of inversion in particle sizing using light extinction method

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China Particuology 2007年第4期5卷 295-299页

作者： Mingxu Su Feng Xu Xiaoshu Cai Kuanfang Ren Jianqi Shen Institute of particle and Two Phase Flow Measurement Technology University of Shanghai .for Science and Technology Shanghai 200093 China LESP UMR6614/CORIA CNRS-Universite France INSA de Rouen 76801 France

In particle sizing by light extinction method, the regularization parameter plays an important role in applying regularization to find the solution to ill-posed inverse problems. We combine the generalized cross-validation （GCV） and L-curve criteria with the Twomey-NNLS algorithm in parameter optimization. Numerical simulation and experimental validation show that the resistance of the newly developed algorithms to measurement errors can be improved leading to stable inversion results for unimodal particle size distribution.

关键词： particle size analysis Light extinction Inversion algorithm Regularization parameter

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Grain Crush and Its Evolution in Granular Material： a Two-Dimensional Distinct Element Model Approach

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Chinese Physics Letters 2004年第8期21卷 1651-1654页

作者：王宝善施行觉陈颙葛洪魁黄庭芳 SchoolofEarthandSpaceScience UniversityofScienceandTechnologyofChinaHefei230026 InstituteofGeophysics ChinaEarthquakeAdministrationBeijing100081 DepartmentofGeosciences StateUniversityofNewYorkatStonyBrookStonyBrookNY11794-2100USA

A crush criterion and a simplified post-crush process for spherical grains are introduced into the traditional distinct element model (DEM). The crush criterion is based on Hertzian contact, and it indicates a negative relation between critical force Fcr and radius R via Fcr∝R−3/2. Effects of grain crush on deformation pattern and statistical features of crush evolution for samples under uniaxial strain load are intensively investigated. Influences of maximum crush times and particle size distribution (PSD) are also discussed. It is found that: (1) Grain crush will blur the localization of deformation. (2) Crush is prone to occur in larger grains, due to force concentration and lower critical force Fcr for larger grains. (3) Grain crush only temporarily reduces contact force, which results in the most rapid increase of the number of grains with maximum crush time.

关键词： particle size analysis

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Application of multi-phase particle swarm optimization technique to retrieve the particle size distribution

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Chinese Optics Letters 2008年第5期6卷 346-349页

作者：齐宏阮立明王圣刚史萌赵辉 School of Energy Science and Engineering Harbin Institute of Technology

The multi-phase particle swarm optimization （MPPSO） technique is applied to retrieve the particle size distribution （PSD） under dependent model. Based on the Mie theory and the Lambert-Beer theory, three PSDs, i.e., the Rosin-Rammer （R-R） distribution, the normal distribution, and the logarithmic normal distribution, are estimated by MPPSO algorithm. The results confirm the potential of the proposed approach and show its effectiveness. It may provide a new technique to improve the accuracy and reliability of the PSD inverse calculation.

关键词： Beverages Grain size and shape Optimization particle size particle size analysis Power spectral density Pulse shaping circuits size distribution

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Study on the System for Separating Sulfurfrom Flue Gas and Dust

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Journal of Systems Engineering and Electronics 2000年第4期11卷 73-79页

作者： Guo Jinji Zhan Sheng Chen Hai Xie Xushi Dept. of Applied Mechanics and Engineering Zhongshan UniversityGuangzhou 510275 P. R. China

This paper describes the structure of the system for separating sulfur from flue gas and dust. In the paper, the velocities of turbulent flow and laminar flow inside the tower, the total of liquid membrance, and the additional flow of rotation fogged fluid are calculated, and the separation of rotation air-solid affected by tower is analyzed. The velocity distribution in quasi free vortex area is obtained from experiment. The minimum separated particle diameter is computed. The paper also studies the chemical reactions of flue gas containing sulfide with the dynamic fogged sulfur separating agent and discusses the main factors related to the effect of separating sulfur and dust. At last, the applications of separating sulfur in industrial stove and collecting dust in environmental engineering are introduced.

关键词： Dust Flue gases Laminar flow Liquid membranes particle size analysis Separation Turbulent flow

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Synthesis and optical properties of PbMoO_4 nanoplates

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Chinese Optics Letters 2010年第12期8卷 1152-1155页

作者：贾润萍张英强 School of Materials Science and Engineering Shanghai Institute of Technology

Nanometer sized lead molybdate （PbMoO4） plates are prepared through conventional hydrothermal together with sonochemical methods. The plates are then characterized using field-emission scanning electron microscopy, X-ray diffractometry, Fourier transform infrared （FTIR） spectrometry, photoluminescence spectrometry, and ultraviolet-visible （UV-VIS） spectrometry. The results indicate that the nanoplates have a characteristically narrow particle size distribution and their tetragonal scheelite-type structure is confirmed by both X-ray diffractometry and FTIR spectrometry. When the nanoplates are compared with the corresponding bulk crystals, blue shifts in their photoluminescence peaks, wider optical band gaps, and the broadening of the X-ray diffractometer peaks are observed. These can be ascribed to the decrease in crystal size.

关键词： Diffraction Fourier transforms Nanostructures particle size analysis Photoluminescence Plates (structural components) Scanning electron microscopy Spectrometry Tungstate minerals X ray diffraction analysis X rays

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New algorithm and system for measuring size distribution of blood cells

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Chinese Optics Letters 2004年第6期2卷 343-346页

作者：姚翠萍李政张镇西 Key Laboratory of Biomedical Information Engineering of Ministry of Education P. R. China and Institute of Biomedical Engineering School of Life Science and Technology Xi'an Jiaotong University Xi'an 710049 Key Laboratory of Biomedical Information Engineering of Ministry of Education P. R. China and Institute of Biomedical Engineering School of Life Science and Technology Xi'an Jiaotong University Xi'an 710049n optical scattering particle sizing a numerical transform is sought so that a particle size distribution can be determined from angular measurements of near forward scattering which has been adopted in the measurement of blood cells. In this paper a new method of counting and classification of blood cell laser light scattering method from stationary suspensions is presented. The genetic algorithm combined with nonnegative least squared algorithm is employed to inverse the size distribution of blood cells. Numerical tests show that these techniques can be successfully applied to measuring size distribution of blood cell with high stability.

In optical scattering particle sizing, a numerical transform is sought so that a particle size distribution can be determined from angular measurements of near forward scattering, which has been adopted in the measurement of blood cells. In this paper a new method of counting and classification of blood cell, laser light scattering method from stationary suspensions, is presented. The genetic algorithm combined with nonnegative least squared algorithm is employed to inverse the size distribution of blood cells. Numerical tests show that these techniques can be successfully applied to measuring size distribution of blood cell with high stability.

关键词： Genetic algorithms Least squares approximations Light scattering Numerical methods particle size analysis

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Determining particle size distribution and refractive index in a two-layer tissue phantom by linearly polarized light

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Chinese Optics Letters 2006年第1期4卷 45-48页

作者：邓勇鲁强骆清铭 Key Laboratory of Biomedical Photonics of Ministry of Education Huazhong University of Science and TechnologyWuhan430074

We report a new method for measuring particle size distribution （PSD） and refractive index of the top layer ill a two-layer tissue phantom simulated epithelium tissue by varying the azimuth angle of incident linearly polarized light. The polarization gating technique is used to decouple the single and multiple scattering components in the returned signal. The theoretical model based on Mie theory is presented and a nonlinear inversion method -floating genetic algorithm - is applied to inverting the azimuth dependence of component of polarization light baekscattered. The experiment results demonstrate that the size distribution and refractive index of the scatters of the top layer can be determined by measuring and analyzing the differential signal of the parallel and perpendicular components from a two-layer tissue phantom. The method implies to detect precancerous changes in human epithelial tissue.

关键词： Backscattering Genetic algorithms Mathematical models particle size analysis Refractive index

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