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Stability analysis of longwall top-coal caving face in extra-thick coal seams based on an innovative numerical hydraulic support model

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International Journal of Mining Science and Technology 2024年第4期34卷 491-505页

作者： Jun Guo Wenbo Huang Guorui Feng Jinwen Bai Lirong Li Zi Wang Luyang Yu Xiaoze Wen Jie Zhang Wenming Feng College of Mining engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of shanxi Province for Mine Rock Strata Control and Disaster Prevention Taiyuan University of TechnologyTaiyuan 030024China shanxi Coking Coal Group Co. Ltd.Taiyuan 030024China shanxi-zheda institute of advanced materials and chemical engineering Taiyuan 030024China

The relationship between support and surrounding rock is of great significance to the control of surrounding rock in mining *** view of the fact that most of the existing numerical simulation methods construct virtual elements and stress servo control to approximately replace the hydraulic support problem,this paper establishes a new numerical model of hydraulic support with the same working characteristics as the actual hydraulic support by integrating numerical simulation software Rhino,Griddle and FLAC3D,which can realize the simulation of different working *** on this model,the influence mechanism of the supporting strength of hydraulic support on surrounding rock stress regulation and coal stability in front of the top coal caving face in extra thick coal seam were ***,under different support intensity,the abutment pressure of the bearing coal and the coal in front of it presents the “three-stage”evolution *** influence range of support intensity is 15%–30%.Secondly,1.5 MPa is the upper limit of impact that the support strength can have on the front coal failure ***,within a displacement range of 2.76 m from the coal wall,a support strength of1.5 MPa provides optimal control of the horizontal displacement of the coal.

关键词： Extremely thick coal seam Fully mechanized top coal caving Support strength Support-surrounding rock interaction

酸性矿井水环境中矸石胶结充填体的强度演化及劣化规律

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Journal of Central South University 2024年第5期31卷 1560-1573页

作者：赵永辉郭育霞冯国瑞 College of Mining engineering Taiyuan University of TechnologyTaiyuan 030024China shanxi Province Research Centre of Green Mining engineering.Technology Taiyuan 030024China shanxi Province Coal-based Resources Green and High-efficiency Development engineering.Center Taiyuan 030024China shanxi-zheda institute of advanced materials and chemical engineering Taiyuan 030024China

矸石胶结充填开采是一种重要的充填开采方法,然而,酸性矿井水会严重影响矸石胶结充填体的强度。在本研究中,将矸石胶结充填体试件分别置于不同环境(空气、水、硫酸溶液、硫酸与荷载耦合)中,测试了不同龄期试件的抗压强度、电阻率及超声... 详细信息

矸石胶结充填开采是一种重要的充填开采方法,然而,酸性矿井水会严重影响矸石胶结充填体的强度。在本研究中,将矸石胶结充填体试件分别置于不同环境(空气、水、硫酸溶液、硫酸与荷载耦合)中,测试了不同龄期试件的抗压强度、电阻率及超声波波速,监测了加载过程中试件的声发射能量数值,同时结合扫描电镜和X衍射分析不同龄期充填体的微观结构。结果表明,1)空气中与水中养护的充填体抗压强度的增长趋势随龄期的增加而逐渐减缓。硫酸溶液中的充填体强度在前90天大于空气及水中养护的充填体强度。硫酸溶液与荷载耦合作用下充填体的强度随龄期的下降速率比单一硫酸溶液作用的较为缓慢;2)不同龄期矸石胶结充填体电阻率与超声波波速与强度有较好的对应关系。受侵蚀后矸石胶结充填体的破坏形式较为多样,且在加载不同阶段表现出不同的声发射能量特征,可以将声发射能量激增作为充填体的破坏前兆;3)侵蚀产物前期填充充填体内部孔隙,提高了其强度,后期会导致充填体膨胀开裂,强度降低。施加40%应力强度比的荷载会抵抗硫酸溶液的侵蚀。本文研究结果可以为充填体的耐侵蚀设计提供参考。

关键词：酸性矿井水矸石胶结充填体劣化规律电阻率超声波波速声发射能量微观结构

基于蒽和三苯胺基D-π-A结构的蓝色荧光材料在有机发光和紫外探测集成器件中的应用

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Science China materials 2024年第1期67卷 197-204页

作者：董文健白雲水王雅婷赵松许慧侠苗艳勤罗巧王华于军胜 Key Laboratory of Interface Science and engineering.in advanced materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054China

有机集成化光电子器件兼具了小型化和多功能性的优势,如集成了有机发光和紫外探测的有机发光紫外探测器件(OLED-UVOPDs).这种器件中的有机光电材料的设计仍然面临重大的挑战.在本文中,以蒽为π桥,腈基苯为受体,三苯胺(TPA)和二甲基三苯... 详细信息

有机集成化光电子器件兼具了小型化和多功能性的优势,如集成了有机发光和紫外探测的有机发光紫外探测器件(OLED-UVOPDs).这种器件中的有机光电材料的设计仍然面临重大的挑战.在本文中,以蒽为π桥,腈基苯为受体,三苯胺(TPA)和二甲基三苯胺(2mTPA)分别为给体,设计并合成了两种可用于OLED-UVOPD器件的蓝色发光分子,TPA-AN和2mTPA-AN.它们的发光峰分别位于474和488 nm处,荧光量子产率为51.1%和46.6%.通过单载流子器件计算得到其电子迁移率分别为3.96×10^(-5)和6.63×10^(-7)cm^(2)V^(-1)s^(-1).基于TPA-AN的OLED器件表现出强的蓝光发射,最大亮度为43,110 cd m^(-2),最大外量子效率(EQE)为8.1%.它们在OLED-UVOPD集成器件中表现出优异的性能,紫外探测率分别为7.18×10^(11)和2.85×10^(12)Jones,最大EQE分别为8.7%和5.9%.

关键词：紫外探测集成器件有机光电材料电子迁移率光电子器件最大亮度蓝色发光 OLED

超韧PLA/m-POE/P(BF-PBAD)复合材料的制备与性能

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材料科学与工程学报 2024年第3期42卷 351-361页

作者：李智陈锋邱碧薇上官勇刚郑强材料与化学学院上海理工大学上海200093 高分子合成与功能化教育部重点实验室浙江大学高分子科学与工程系浙江杭州310027

采用自制的生物基聚酯弹性体P(BF-PBAD)成功制备了一种新型超韧聚乳酸/甲基丙烯酸缩水甘油酯改性聚烯烃弹性体/生物基聚酯弹性体(PLA/m-POE/P(BF-PBAD))复合材料,并对其性能及增韧机制进行了研究。当P(BF-PBAD)含量仅为3份时,复合材料... 详细信息

采用自制的生物基聚酯弹性体P(BF-PBAD)成功制备了一种新型超韧聚乳酸/甲基丙烯酸缩水甘油酯改性聚烯烃弹性体/生物基聚酯弹性体(PLA/m-POE/P(BF-PBAD))复合材料,并对其性能及增韧机制进行了研究。当P(BF-PBAD)含量仅为3份时,复合材料的冲击强度达到42 kJ/m^(2),相比纯PLA提高了14倍,呈现出良好的增韧效果。此外,复合材料还具有优异的机械性能,拉伸强度、断裂伸长率、弯曲强度及弯曲模量分别达到40 MPa、120%、50 MPa和1800 MPa。与纯PLA相比,该复合材料表现出好的热稳定性,玻璃化转变温度和熔融温度均得到提升。P(BF-PBAD)的引入使得复合材料在二次升温过程中的冷结晶行为增强。基于对复合材料相形貌、动态力学等结果的分析,发现PLA/m-POE/P(BF-PBAD)复合材料的增韧主要缘于聚合物界面相容性的提高。

关键词： PLA复合材料界面增容冲击韧性

GaN based ultraviolet laser diodes

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Journal of Semiconductors 2024年第1期45卷 6-15页

作者： Jing Yang Degang Zhao Zongshun Liu Yujie Huang Baibin Wang Xiaowei Wang Yuheng Zhang Zhenzhuo Zhang Feng Liang Lihong Duan Hai Wang Yongsheng Shi State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China

In the past few years,many groups have focused on the research and development of GaN-based ultraviolet laser diodes(UV LDs).Great progresses have been achieved even though many challenges *** this article,we analyze the challenges of developing GaN-based ultraviolet laser diodes,and the approaches to improve the performance of ultraviolet laser diode are *** these techniques,room temperature(RT)pulsed oscillation of AlGaN UVA(ultraviolet A)LD has been realized,with a lasing wavelength of 357.9 *** with the suppression of thermal effect,the high output power of 3.8 W UV LD with a lasing wavelength of 386.5 nm was also fabricated.

关键词： diodes laser GaN

Controllable construction of ionic frameworks for multi-site synergetic enhancement of CO_(2) capture

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Frontiers of chemical Science and engineering 2024年第1期18卷 37-49页

作者： Yuke Zhang Hongxue Xu Haonan Wu Lijuan Shi Jiancheng Wang Qun Yi State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024China School of chemical engineering.and Pharmacy Wuhan Institute of TechnologyWuhan 430205China shanxi-zheda institute of advanced materials and chemical engineering Taiyuan 030024China

CO_(2) capture is one of the key technologies for dealing with the global warming and implementing lowcarbon development *** emergence of ionic metal-organic frameworks(I-MOFs)has diversified the field of porous materials,which have been extensively applied for gas adsorption and *** this work,amino-functionalized imidazolium ionic liquid as organic monodentate ligand was used for one step synthesis microporous Cu based *** tuning of the adsorption properties was obtained by incorporating aromatic anions,such as phenoxy,benzene carboxyl,and benzene sulfonic acid group into the I-MOFs via a facile ion exchange *** new I-MOFs showed high thermal stability and high capacity of 5.4 mmol·g^(-1) under atmospheric conditions for selective adsorption of CO_(2).The active sites of microporous Cu-MOF are the ion basic center and unsaturated metal,and electrostatic attraction and hydroxyl bonding between CO_(2) and modified functional sulfonic groups are responsible for the *** work provides a feasible strategy for the design of I-MOF for functional gas capture.

关键词： carbon dioxide capture micropores ionic liquids multi-site synergism ionic metal-organic frameworks

Strain Softening of Styrene-Isoprene-Styrene Copolymers under Large Amplitude Oscillatory Shear for Clarifying Payne Effect in Rubbers and Their Nanocomposites

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Chinese Journal of Polymer Science 2023年第1期41卷 153-165页

作者： Xin-Peng Fan Yi-Hu Song Qiang Zheng Wan-Jie Wang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027China shanxi-zheda institute of New materials and chemical engineering Taiyuan030000China College of materials Science and engineering Henan Key Laboratory of Advanced Nylon Materials and ApplicationZhengzhou UniversityZhengzhou450001China

To illustrate mechanisms of Payne effect in rubbers and their nanocomposites experiencing large amplitude oscillatory shear(LAOS),comparison studies were performed in styrene-isoprene-styrene(SIS)copolymers and their selectively crosslinked materials at temperatures below and above glass transition temperature of the polystyrene(PS)*** was found that under periodic dynamic shear,the strain softening is reversible when the polyisoprene(PI)phase,either crosslinked or not,is restricted by hard PS domains but it shows hysteresis once the PS domains *** strain softening can happen at the time scale of intrinsic Rouse relaxation of elastically active network *** stress of strain softening scales with number density of elastically active network strands,a simple relation being verified not only in the selectively crosslinked SIS copolymers but also in PI gum vulcanizates and carbon black filled PI *** effect is traditionally used to term strain softening of highly filled rubber vulcanizates under LAOS deformation while evidenced herein is that the Payne effect of highly filled rubber vulcanizates shares the mechanism being common to the strain softening of SIS copolymers.

关键词： Large amplitude oscillatory shear SIS Rubber nanocomposites Strain softening

Assessing quinoline removal performances of an aerobic continuous moving bed biofilm reactor(MBBR) bioaugmented with Pseudomonas citronellolis LV1

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Chinese Journal of chemical engineering 2023年第5期57卷 132-140页

作者： Hu Chen Ying Wang Puyu Wang Yongkang Lv Innovation institute of Environmental Industry College of Environmental Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China The State Key Laboratory of Clean and Efficient Utilization of Coal-Based Energy Taiyuan University of TechnologyTaiyuan 030024China China institute for Radiation Protection Taiyuan 030006China shanxi-zheda institute of advanced materials and chemical engineering Taiyuan 030024China

This study evaluated the bioaugmentation potential of a quinoline-degrading strain Pseudomonas citronellolis LV1 inoculation into activated sludge for treating quinoline wastewater, and results indicated the inoculation of LV1 in aerobic continuous MBBR could substantially improve the quinoline removal performance with an improved removal efficiency of 34% averagely when quinoline was used as the sole carbon and nitrogen source. Additionally, efficient removal of quinoline in enhanced MBBR occurred at the influent p H of 7.0–8.0, hydraulic retention time(HRT) of 24–28 h and influent quinoline concentration of 100–700 mg·L^(-1). High-throughput sequencing analysis indicated that bioaugmentation could increase microbial diversity and shape the microbial community structure. Although the inoculant LV1 did not remain its dominance in stage Ⅲ, bioaugmentation indeed induced the formation of effective microbial community, and the indigenous microbes including Flavobacterium, Pseudoxanthomonas,Pseudomonas, Vermamoeba, Dyadobacter and Sphingomonas might play the key role in quinoline *** to the PICRUSt, the enhanced genes encoding aromatic ring-cleavage enzyme, especially for Nheterocyclic ring-cleavage enzymes, could lead to the improved removal performance of quinoline in bioaugmentation stage. Moreover, the enhanced MBBR treated well actual coking wastewater, as indicated by high removal performance of quinoline, phenol and COD.

关键词： Aerobic quinoline degradation Pseudomonas citronellolis LV1 Bioaugmentation Microbial community Coking wastewater

Sulfur-deficient CoNi_(2)S_(4)nanoparticles-anchored porous carbon nanofibers as bifunctional electrocatalyst for overall water splitting

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Frontiers of chemical Science and engineering 2023年第11期17卷 1707-1717页

作者： Gaohui Du Yi Fan Lina Jia Yunting Wang Yawen Hao Wenqi Zhao Qingmei Su Bingshe Xu shanxi-zheda institute of advanced materials and chemical engineering Taiyuan 030000China materials institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi’an 710021China

Water electrolysis technology is considered to be one of the most promising means to produce ***,aiming at the problems of high overpotential and slow kinetics in water splitting,N-doped porous carbon nanofibers-coupled CoNi_(2)S_(4)nanoparticles are prepared as bifunctional *** the strategy,NaCl is used as the template to prepare porous carbon nanofibers with a large surface area,and sulfur vacancies are created to modulate the electronic structure of CoNi_(2)S_(4).Electron spin resonance confirms the formation of abundant sulfur vacancies,which largely reduce the bandgap of CoNi_(2)S_(4)from 1.68 to 0.52 *** narrowed bandgap is conducive to the migration of valence electrons and decreases the charge transfer resistance for electrocatalytic ***,the uniform distribution of CoNi_(2)S_(4)nanoparticles on carbon nanofibers can prevent the aggregation and facilitate the exposure of electrochemical active ***,the composite catalyst exhibits low overpotentials of 340 mV@100 mA·cm^(-2)for oxygen evolution reaction and 380 mV@100 mA·cm^(-2)for hydrogen evolution *** assembled electrolyzer requires 1.64 V to achieve 10 mA·cm^(-2)for overall water-splitting with good long-term *** excellent performance results from the synergistic effect of porous structures,sulfur deficiency,nitrogen doping,and the well-dispersed active component.

关键词： nanoparticle sulfur vacancy porous carbon nanofiber transition metal sulfides electrolysis