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Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method

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Journal of Renewable Materials 2022年第5期10卷 1439-1458页

作者： Guanfeng Chang Xinzhu Hua Xiao Liu Chen Li Enqian Wang Bingjun Sun state key laboratory of mining Response and Disaster Prevention and control in Deep Coal Mines Anhui University of Science and TechnologyHuainan232001China

The filling mining method is important in realizing the green mining of mineral *** at the problems of land resource occupation,environmental pollution,and rational utilization of coal-based solid wastes such as coal gangue,fly ash,and desulfurization gypsum,a new paste filling material was developed with coal gangue,fly ash,and desulfurization gypsum as raw *** microstructure of the raw materials was analyzed by XRD and *** with the Box-Behnken experimental design,the effect of each component on the fluidity of the filling slurry was analyzed through the response surface *** significance of each component on its bleeding and fluidity was determined,and the optimal ratio of the filling slurry was *** results show that the microcosmic morphology of coal gangue,desulfurization gypsum,and gasification slag presents an irregular block and rough particle surface;the microcosmic morphology of fly ash and bottom slag presents first out spherical or quasi spherical ***,obvious sintering traces exist on the surface of the bottom *** main crystal mineral of coal gangue and fly ash is SiO_(2),the desulfurization gypsum is composed of Ca(SO_(4))(H_(2)O)and Ca(CO_(3))crystal minerals,the gasification slag is composed of carbon and nitrogen compounds,and the main crystal mineral components in the bottom slag sample are SiO_(2) and Al_(x)Si_(y)O_(z) *** order of significance of each key factor on slurry fluidity is as follows:C(desulfurization gypsum)>D(gasification slag and bottom slag 1:1)>A(coal gangue)>B(fly ash).The order of the significance of each key factor on slurry bleeding is as follows:B(fly ash)>C(desulfurization gypsum)>D(gasification slag and bottom slag 1:1)>A(coal gangue).Considering the material preparation,field application,and other conditions,the mass percentage of each factor content of the new paste filling material is as follows:49.5%coal gangue,8.3%fly ash,4.1%desulfur

关键词： Coal-based solid waste filling slurry flowability proportion optimization response surface method

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Application of foam technology for dust control in underground coal mine

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International Journal of mining Science and Technology 2014年第1期24卷 13-16页

作者： Ren Wanxing Wang Deming Guo Qing Zuo Bingzhao state key laboratory of Coal Resources and Safe mining China University of Mining & Technology key laboratory of Gas and Fire control for Coal Mines China University of Mining & TechnologyMinistry of Education School of Safety Engineering China University of Mining & Technology

In order to effectively control the dust in the underground coal mine,this study proposes and develops a new technology for dust control by foam,and briefly demonstrates the advantage of the foam technology for dust control,such as the good isolation performance,large contact area,high wetting ability,strong adhesion and so ***,the details of the technology are introduced,including the foam agent,foam generator,and foam production *** the paper studies the relationship between the foaming agent concentration and liquid surface tension,and explains the principle of the foam *** technology is applied in heading *** application results show that the foam has a remarkable effect on dust control in underground coal mines.

关键词： Coal dust Dust control Foaming agent Foam generator

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Research on the "three shells" cooperative support technology of large-section chambers in deep mines

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International Journal of mining Science and Technology 2021年第4期31卷 665-680页

作者： Cheng Zhu Yong Yuan Wenmiao Wang Zhongshun Chen Shengzhi Wang Huiwei Zhong key laboratory of Deep Coal Resources mining Ministry of Education of ChinaChina University of Mining and TechnologyXuzhou 221116China School of Mines State Key Laboratory of Coal Resources&Safe MiningChina University of Mining and TechnologyXuzhou 221116China

The"three shells"cooperative support technology was proposed herein according to both the large deformation of the rock surrounding large-section chambers in deep mines and the precarious stability of the support structures *** development range of the plastic zone in the surrounding rock was controlled by a stress shell to reduce the difficulty of controlling the surrounding ***,the residual strength of the rock mass in the plastic zone and the self-bearing capacity of the surrounding rock were improved by a reinforced load-bearing ***,a passive load-bearing shell could restore the triaxial stress state of the surrounding rock on the free surface,reduce the influence of the external environment on the surrounding rock,and reinforce the surrounding rock with the strength of the *** layouts of large-section chambers were determined by analyzing the control effect of the stress shell on the surrounding rock under three kinds of in situ stress *** orthogonal test method was applied to reveal the influences of different support parameters in the reinforced loadbearing shell and passive load-bearing shell on the surrounding rock *** surrounding rock control effect of the"three shells"collaborative support technology was analyzed through numerical simulation and field *** results show that the maximum displacement between the roof and floor of the coal preparation chamber in the Xinjulong coal mine was approximately 48 mm,and the maximum displacement between its two sides was approximately 65 mm,indicating that the technology proposed herein could meet the long-term control requirements of the surrounding rock stability for large-section chambers in deep mines.

关键词： Deep mining Large-section chamber "Three shells"cooperative support Reasonable layout Surrounding rock control

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Response of cellular stoichiometry and phosphorus storage of the cyanobacteria A phanizomenon flos-aquae to smallscale turbulence

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Chinese Journal of Oceanology and Limnology 2017年第6期35卷 1409-1416页

作者：李哲肖艳杨吉祥李超高遐郭劲松 CAS key laboratory on Reservoir Water Environment Chongqing Institute of Green and Intelligent TechnologyChinese Academy of Sciences state key laboratory of Bioreactor Engineering College of BiotechnologyEast China University of Science and Technology

Turbulent mixing, in particular on a small scale, aff ects the growth of microalgae by changing diff usive sublayers and regulating nutrient fluxes of cells. We tested the nutrient flux hypothesis by evaluating the cellular stoichiometry and phosphorus storage of microalgae under dif ferent turbulent mixing conditions. A phanizomenon flos-aquae were cultivated in dif ferent stirring batch reactors with turbulent dissipation rates ranging from 0.001 51 m2/s 3 to 0.050 58 m 2/s 3, the latter being the highest range observed in natural aquatic systems. Samples were taken in the exponential growth phase and compared with samples taken when the reactor was completely stagnant. Results indicate that, within a certain range, turbulent mixing stimulates the growth of A. flos-aquae. An inhibitory ef fect on growth rate was observed at the higher range. Photosynthesis activity, in terms of maximum ef fective quantum yield of PSII(the ratio of F v/F m) and cellular chlorophyll a, did not change significantly in response to turbulence. However, Chl a/C mass ratio and C/N molar ratio, showed a unimodal response under a gradient of turbulent mixing, similar to growth rate. Moreover, we found that increases in turbulent mixing might stimulate respiration rates, which might lead to the use of polyphosphate for the synthesis of cellular constituents. More research is required to test and verify the hypothesis that turbulent mixing changes the dif fusive sublayer, regulating the nutrient flux of cells.

关键词： Aphanizomenon flos-aquae cellular stoichiometry photosynthesis polyphosphate turbulent dissipation rate

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Tomography of the dynamic stress coefficient for stress wave prediction in sedimentary rock layer under the mining additional stress

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International Journal of mining Science and Technology 2021年第4期31卷 653-663页

作者： Wenlong Shen Guocang Shi Yungang Wang Jianbiao Bai Ruifeng Zhang Xiangyu Wang Henan key laboratory for green and Efficient mining&Comprehensive Utilization of Mineral Resources School of Energy Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000China key laboratory of Deep Coal Resource mining Ministry of Education State Key Laboratory of Coal Resources and Safe MiningChina University of Mining and TechnologyXuzhou 221116China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization Jiaozuo 454000China

In this study,the tomography of dynamic stress coefficient(TDSC)was established based on a mechanical model of stress wave propagation in bedding planes and a mathematical model of the stress wave attenuation in rock *** reliability of the TDSC was verified by a linear bedding plane model and field ***,the TDSC in the dynamic stress propagation of bedding planes increases with the following conditions:(1)the increase of the normal stiffness of the bedding plane,(2)the increase of the incident angle of the stress wave,(3)the decrease of the incident frequency of the stress wave,or(4)the growth of three ratios(the ratios of rock densities,elastic moduli,and the Poisson’s ratios)of rocks on either side of bedding *** additional stress weakens TDSC linearly and slowly during the stress wave propagation in bedding planes,and the weakening effect increases with the growth of the three ***,the TDSC decreases exponentially in the rock mass as propagation distance *** a field case,the TDSC decreases significantly as vertical and horizontal distances increase and its wave range increases as vertical distance increases in the sedimentary rock layers.

关键词： Tomography of the dynamic stress coefficient Stress wave attenuation mining additional stress Sedimentary rock layer

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Floor heave characteristics and control technology of the roadway driven in deep inclined-strata

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International Journal of mining Science and Technology 2015年第2期25卷 267-273页

作者： Wang Meng Guo Guanlong Wang Xiangyu Guo Yu Dao Vietdoan state key laboratory of Coal Resources and Safety mining School of MinesChina University of Mining & Technology Hanoi University of mining and Geology

Based on in-mine instrumentation and theoretical analysis of the unsymmetrical large-deformation that occurred in the roadway after excavation,Differential Floor Heave(DFH)was found to be the main reason for roadway *** needs to be pointed out that the specific roadway was driven in inclined rock *** addition,the factors that contribute to the occurrence of DFH are discussed in *** is believed that DFH is triggered by the unsymmetrical stress distribution in the floor and the different rock types encountered near the two floor ***,DFH control should be focused on the left floor corner where shearing failure occurs initially and the left floor surface where tensile failure is more *** proposed DFH control strategies include unsymmetrical grouting for the whole roadway,re-design of the roof and ribs support,reinforcement of the weak zones,and release of the concentrated stress in the earlier ***,it is recommended that in the later stage,both bolts and cable bolts with higher strength and the backfilling technique using the coal measure rocks and concrete should be employed in the reversed-arch *** field instrumentation results,after using the proposed control strategies,indicate that large deformation in a DFH roadway has been successfully controlled.

关键词： Deep roadway Inclined strata Differential Floor Heave (DFH)Unsymmetrical deformation Two stage control strategies

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Pore-scale modeling of pore structure properties and wettability effect on permeability of low-rank coal

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International Journal of mining Science and Technology 2023年第5期33卷 573-584页

作者： Xiangjie Qin Jianchao Cai Gang Wang state key laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China state key laboratory of mining Disaster Prevention and control Cofounded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

Permeability is a key parameter for coalbed methane *** the absolute permeability of coal has been extensively studied,wettability and pore structure properties continue to challenge the microscopic description of water-gas flow in *** this purpose,we reconstructed the microstructures of low-rank coal using micro-computed tomography(micro-CT)*** geometry and pore-throat parameters are introduced to establish a relationship with absolute permeability.A dual-porosity pore network model is developed to study water-gas displacement under different wetting and pore structure *** show that absolute permeability is significantly affected by pore geometry and can be described using a binary quadratic function of porosity and fractal ***-gas relative permeability varies significantly and the residual gas saturation is lower;the crossover saturation first decreased and then increased with increasing porosity under hydrophobic *** the water relative permeability is lower and a certain amount of gas is trapped in complex pore-throat networks;the crossover saturation is higher under hydrophilic *** with large percolating porosity and well-developed pore networks have high displacement efficiency due to low capillary resistance and avoidance of *** work provides a systematic description of absolute permeability and water-gas relative permeability in coal microstructure for enhanced gas recovery.

关键词： Micro-CT Permeability Wetting condition Pore structure properties Water-gas flow

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Solvent-free mechanochemical mild oxidation method to enhance adsorption properties of chitosan

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 353-366页

作者： Mohammadtaghi Vakili Wen Qiu Giovanni Cagnetta Jun Huang Gang Yu green Intelligence Environmental School Yangtze Normal UniversityChongqing 408100China state key Joint laboratory of Environment Simulation and Pollution control(SKJLESPC) Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)School of EnvironmentTsinghua UniversityBeijing 100084China

Oxidation has been profitably utilized to improve some properties of ***,only solventbased oxidation procedures have been proposed so far,which are hardly feasible at industrial scale in an economic way because of product recovery *** this study,a solvent-free,rapid,and effective oxidation method is *** is based on direct solid-state reaction between chitosan and oxidant powder in a mechanochemical *** prove that by short high energy ball milling(<3 h)it is possible to achieve diverse physicochemical modifications employing different *** from polysaccharidic chain shortening,persulfate provokes high amorphization and induces formation of ketonic groups;percarbonate heightens deacetylation degree,preserving in part crystallinity;calcium peroxide merely deprotonates amino groups and increases amorphization *** tests with the azo-dye reactive red 2 show that adsorption capacity of chitosan co-milled with persulfate(974 mg/g milled product),which is the best performing adsorbent,is twice that of pristine chitosan,while adsorption rate is outstandingly boosted(125 times).

关键词： Chitosan High energy ball milling Mechanochemistry Oxidation

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Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth

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International Journal of mining Science and Technology 2023年第11期33卷 1339-1350页

作者： Hongwei Zhou Mingyuan Lu Heping Xie Wenhao Jia Ruidong Peng Yimeng Wang Bocen Chen Pengfei Jing School of Energy and mining Engineering China University of Mining and Technology-BeijingBeijing 100083China state key laboratory of Coal Resources and Safe mining China University of Mining and Technology-BeijingBeijing 100083China state key laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Guangdong Provincial key laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Shenzhen key laboratory of Deep Underground Engineering Sciences and green Energy Shenzhen UniversityShenzhen 518060China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock *** investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and reconstruction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and nonuniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ *** results are compared with existing experimental data to validate the models and calibrate the numerical *** extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are *** influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is *** results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruction methods on the elastic modulus of conventional cores at different *** in-situ pore pressurepreserved test exhibits lower peak stress and peak strain compared to the other three tests,and sandstone subjected to non-uniform pore pressure is more prone to plastic damage and ***,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth.

关键词： In-situ pore pressure-preserved environment Numerical simulation approach Deep in-situ rock mechanics In-situ stress restoration and reconstruction

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The Ca^(2+)/CaN/ACC and cAMP/PKA/HK signal pathways are required for PBAN-mediated sex pheromone biosynthesis in Conogethes punctiferalis

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Journal of Integrative Agriculture 2024年第8期23卷 2735-2751页

作者： Yao Zhang Zelong She Ruolan He Shuangyan Yao Xiang Li Xiaoguang Liu Xinming Yin Jizhen Wei Mengfang Du Shiheng An state key laboratory of Wheat and Maize Crop Science/Henan International laboratory for green Pest control/College of Plant Protection Henan Agricultural UniversityZhengzhou 450046China

Conogethes punctiferalis is a crop and fruit pest that has caused serious economic losses to agricultural *** pest relies heavily on its sex pheromone to ensure sexual encounters and subsequent mating ***,the molecular mechanism underlying sex pheromone biosynthesis in this species remains *** present study investigated the detailed mechanism underlying PBAN-regulated sex pheromone biosynthesis in *** by transcriptome sequencing of the *** pheromone glands(PGs)and subsequent functional identification of the target *** results showed that female mating started from the first scotophase,and peaked at the second to fifth scotophases in accordance with the release of sex *** regulated sex pheromone biosynthesis by employing Ca^(2+)and cAMP as secondary messengers,as demonstrated by RNA interference(RNAi),pharmacological inhibitors,and behavioral *** investigation revealed that calcineurin(CaN)and acetyl-CoA carboxylase(ACC)were activated by PBAN/Ca^(2+)signaling,and the RNAimediated knockdown of CaN and ACC transcripts significantly reduced sex pheromone production,ultimately leading to a significantly reduced ability of females to attract ***,hexokinase(HK)was found to regulate sex pheromone biosynthesis in response to the PBAN/cAMP/PKA signaling pathway,as demonstrated by RNAi,enzyme activity,and pharmacological inhibitor ***,Far2 and Desaturase1 were found to participate in PBAN-regulated sex pheromone ***,our findings revealed that PBAN regulates sex pheromone biosynthesis through the PBANR/Ca^(2+)/CaN/ACC and PBANR/cAMP/PKA/HK pathways in ***,which enriches our comprehension of the details of sex pheromone biosynthesis in moths.

关键词： Conogethes punctiferalis sex pheromone cAMP/PKA calcineurin acetyl-CoA carboxylase hexokinase

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