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Coal gangue separation system based on density measurement

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Coal gangue separation system based on density measurement

Prandtl number effects in MRT lattice Boltzmann models for shocked and unshocked compressible fluids

2.12.IEEE International Conference on Computer Science and Automation Engineering（CSAE 2.12.

作者： chen Zhang School of Chemical and Environmental Engineering china University of {2. and technology beijing,china chenglian Zhang School of Chemical and Environmental Engineering china University of {2. and technology beijing,china

Coal gangue separation is an essential part of the development and utilization of coal.A method of separating gangue from coal based on the density by calculating volume and weight of the ores which is measured by the designed equipment was given in this *** working principle of the separation method was described firstly,then the system composition of the separation system was introduced,further more,the main influence factors of the separation accuracy were analyzed.

关键词： coal coal gangue separation system

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Theoretical & Applied Mechanics Letters 2011年第5期1卷 60-63页

作者： Feng chen,1 Aiguo Xu,2.Guangcai Zhang,2.and Yingjun Li 1,1) State Key Laboratory for GeoMechanics and Deep Underground Engineering,china University of {2. and technology (beijing),beijing 100083,china 2. National Key Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,P.O.Box 8009-2.,beijing 100088,china National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P. O. Box 8009-26 Beijing 100088 China

This paper constructs a new multiple relaxation time lattice Boltzmann model which is not only for the shocked compressible fluids,but also for the unshocked compressible *** make the model work for unshocked compressible fluids,a key step is to modify the collision operators of energy flux so that the viscous coefficient in momentum equation is consistent with that in energy equation even in the unshocked *** unnecessity of the modification for systems under strong shock is *** model is validated by some well-known benchmark tests,including thermal Couette flow,Riemann *** first system is unshocked and the latter is *** both systems,the Prandtl number effects are *** agreements are obtained between new model results and analytical ones.

关键词： lattice Boltzmann method compressible flows multiple-relaxation-time Prandtl number

Deep learning based water leakage detection for shield tunnel lining

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 887-898页

作者： Shichang LIU Xu XU Gwanggil JEON Junxin chen Ben-Guo HE College of Computer Science Sichuan UniversityChengdu 610065China School of Computer Science and Engineering Northeastern UniversityShenyang 110004China Department of Embedded Systems Engineering Incheon National UniversityIncheon 22012Korea School of Software Dalian University of TechnologyDalian 116621China Key Laboratory of Ministry of Education on Safe mining of Deep Metal Mines Northeastern UniversityShenyang 110819China

Shield tunnel lining is prone to water leakage,which may further bring about corrosion and structural damage to the walls,potentially leading to dangerous *** avoid tedious and inefficient manual inspection,many projects use artificial intelligence(Al)to detect cracks and water leakage.A novel method for water leakage inspection in shield tunnel lining that utilizes deep learning is introduced in this *** proposal includes a ConvNeXt-S backbone,deconvolutional-feature pyramid network(D-FPN),spatial attention module(SPAM).and a detection *** can extract representative features of leaking areas to aid inspection *** further improve the model's robustness,we innovatively use an inversed low-light enhancement method to convert normally illuminated images to low light ones and introduce them into the training *** experiments are performed,achieving the average precision(AP)score of 56.8%,which outperforms previous work by a margin of 5.7%.Visualization illustrations also support our method's practical effectiveness.

关键词： water leakage detection deep learning deconvolutional-feature pyramid spatial attention

ON JENSEN'S INEQUALITY FOR g-EXPECTATION

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Chinese Annals of Mathematics,Series B 2004年第3期25卷 401-412页

作者： JIANG LONG chen ZENGJING School of Mathematics and System Sciences, Shandong University, Jinan 2.0100, china. Department of Mathematics, china University of mining and technology, Xuzhou 2.1008, Jiangsu,china. E-mail: jianglong@*** School of Mathematics and System Sciences, Shandong University, Jinan 2.0100, china. Shandong Univ Sch Math & Syst Sci Jinan 250100 Peoples R China china Univ Min & Technol Dept Math Jiangsu 221008 Peoples R China Shandong Univ Sch Math & Syst Sci Jinan 250100 Peoples R China

Briand et al. gave a counterexample showing that given g, Jensen's inequality for g-expectation usually does not hold in general This paper proves that Jensen's inequality for g-expectation holds in general if and onl... 详细信息

关键词： Backward stochastic differential equation Jensen's inequality g-expectaation Conditional g-expectation Comparison theorem

Friction reactions induced by selective hydrogenation of textured surface under lubricant conditions

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Friction 2024年第1期12卷 174-184页

作者： Naizhou DU Xubing WEI Xiaowei LI Zan chen Shiqi LU Jiaqing DING Cunao FENG Kai chen Jianghao QIAO Dekun ZHANG Kwang-Ryeol LEE Tiancai ZHANG School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Computational Science Center Korea Institute of Science and TechnologySeoul 136-791Republic of Korea technology Development Department Shipbuilding Technology Research InstituteShanghai 200032China

The passivation of hydrogen atoms and the conformation of textured surfaces under oil-lubricated conditions are effective strategies to obtain amorphous carbon(a-C)films with extremely low *** is critical to understanding the influence mechanism of selective surface hydrogenation on the tribological behaviors of textured a-C film under oil-lubricated *** particular,the interactions of hydrogen atoms and lubricants are confusing,which is enslaved to the in situ characterization *** reactive molecular dynamics(RMD)simulations were conducted to analyze the friction response of textured a-C films with selective hydrogenation surfaces under oil-lubricated *** results indicate that the existence of hydrogen atoms on specific bump sites significantly decreases the friction coefficient(μ)of textured a-C film,which is highly dependent on the surface hydrogen *** repulsion between hydrogen atoms and lubricant molecules prompts the formation of a dense lubricant film on the surface of the mating ***,with the enhancement of the surface hydrogen content,the passivation of the friction interface and the repulsion between hydrogen atoms and lubricants play dominant roles in reducing the friction coefficient instead of hydrodynamic lubrication.

关键词： textured amorphous carbon(a-C) selective hydrogenation oil lubrication friction mechanism reactive molecular dynamics(RMD)

THE WEIGHTED FUNCTION COMPREHENSIVE METHOD FOR ANALYZING MECHANICAL STRUCTURE RELIABILITY

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THE WEIGHTED FUNCTION COMPREHENSIVE METHOD FOR ANALYZING MEC...

Dry Coal Preparation ──Can It Replace Wet Coal Preparation Widely Used For 2.0 Years

第二届中日国际机械零件会议

作者： chen Lin (technology Supervision Bureau of{2. National Petroleum Corporation beijing china 10072.) Liu Yang chen Guohua (Daqing Petroleum Institute Anda Heilongjiang china 151400) Meng Huirong (beijing Graduate School china University of mining and technology beijing china 100083)

＜正＞The jumping issue of maximum stress element during analysis of structure reliability with Monte Carlo finite element method is taken into *** using fuzzy comprehensive judgement theory,the concepts of the maximum stress set and the minimum failure set are put ***,the influence of multiple stress larger elements for structure failure and the correlativity of above elements are *** weighted function comprehensive method is presented to calculating the structure ***,the method developed in this paper is applied to the reliability analysis of a easing head *** computational results can be taken as a reference for oil field production practice and structure design.

关键词： Structure Reliability Finite element method Casing head

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china Coal 1997年第S1期 38-39页

作者： chen Qingru and Yang Yufen(china University of {2. & technology)

Study on the characterization of the surface topography of friction pairs during wear process with fractal theory

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Science china Mathematics 2001年第S1期44卷 259-262页

作者： ZHU Hua GE Shirong WANG Haihu CAO Jianwen chen Guoan 1. china University of {2. and technology, Xuzhou 2.1008, china 2. Command Institute of the Corps of Engineers, Xuzhou 2.1004, china china Univ Min & Technol Xuzhou 221008 Peoples R China Corps Engineers Command Inst Xuzhou 221004 Peoples R China

Wear of machine parts is an important problem in operating life of machines. Rationalwear and running-in procedures are able to machine parts improve in conformity, surface topog-raphy and frictional compatibility during usage, therefore improving machine reliability and pro-longing its operating life. Hence, it is necessary to study the topography characterization of thesurfaces of friction pairs and its change laws in wear or running-in process. This paper appliesfractal theory to study the characterization of the worn surface topographies of friction pairs duringthe initial stage of wear process. Experimental researches show that the fractal parameters of thesurface topographies of friction pairs will reach their steady-state values, respectively, with thewear process going on. And the variations of the fractal parameters have corresponding laws fortwo samples of friction pairs.

关键词： friction pairs wear running-in surface topography fractal

Long-term(2.13-2.2.)mapping of winter wheat in the North china Plain using Landsat data:classification with optimal zoning strategy

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Big Earth Data 2024年第3期8卷 494-521页

作者： Yifei Liu Xuehong chen Jin chen Yunze Zang Jingyi Wang Miao Lu Liang Sun Qi Dong Bingwen Qiu Xiufang Zhu State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Science and EngineeringFaculty of Geographical ScienceBeijing Normal UniversityBeijingChina beijing Engineering Research Center for Global Land Remote Sensing Products Institute of Remote Sensing Science and EngineeringFaculty of Geographical ScienceBeijing Normal UniversityBeijingChina State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural Sciences(CAAS)BeijingChina State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern china Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijingChina Key Laboratory of Spatial Data mining&Information Sharing of Ministry of Education Academy of Digital China(Fujian)Fuzhou UniversityFuzhouChina

security and formulating agricultural *** data are the only available source for long-term winter wheat mapping in the North china Plain due to the fragmented landscape in this *** various methods,such as index-based methods,curve similarity-based methods and machine learning-based methods,have been developed for winter wheat mapping based on remote sensing,the former two often require satellite data with high temporal resolution,which are unsuitable for Landsat data with sparse *** learning is an effective method for crop classification using Landsat ***,applying machine learn-ing for winter wheat mapping in the North china Plain encounters two main issues:1)the lack of adequate and accurate samples for classifier training;and 2.the difficulty of training a single classifier to accomplish the large-scale crop mapping due to the high spatial heterogeneity in this *** address these two issues,we first designed a sample selection rule to build a large sample set based on several existing crop maps derived from recent Sentinel data,with specific consideration of the confusion error between winter wheat and winter rapeseed in the available crop ***,we developed an optimal zoning method based on the quadtree region splitting algorithm with classification feature consistency criterion,which divided the study area into six subzones with uni-form classification *** each subzone,a specific random forest classifier was trained and used to generate annual winter wheat maps from 2.13 to 2.2. using Landsat 8 OLI *** sample validation confirmed the high accuracy of the produced maps,with an average overall accuracy of 91.1%and an average kappa coefficient of 0.810 across different *** derived winter wheat area also has a good correlation(R2.0.949)with census area at the provincial *** results underscore the reliability of the produced annual winter wheat *** experiments demonstrate that

关键词： Winter wheat mapping Landsat machine learning North china Plain optimal zoning