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Actively tuning anisotropic light-matter interaction in biaxial hyperbolic materialα-MoO_(3) using phase change material VO_(2) and graphene

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Chinese Physics B 2024年第4期33卷 631-638页

作者：周昆胡杨吴必园仲晓星吴小虎 School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Gas and Fire Control for Coal Mines China University of Mining and TechnologyXuzhou 221116China Shandong Institute of Advanced Technology Jinan 250100China School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China

Anisotropic hyperbolic phonon polaritons(PhPs)in natural biaxial hyperbolic materialα-MoO_(3) has opened up new avenues for mid-infrared nanophotonics,while active tunability ofα-MoO_(3) PhPs is still an urgent problem necessarily to be solved.In this study,we present a theoretical demonstration of actively tuningα-MoO_(3) PhPs using phase change material VO_(2) and graphene.It is observed thatα-MoO_(3) PhPs are greatly dependent on the propagation plane angle of PhPs.The insulator-to-metal phase transition of VO_(2) has a significant effect on the hybridization PhPs of theα-MoO_(3)/VO_(2) structure and allows to obtain actively tunableα-MoO_(3) PhPs,which is especially obvious when the propagation plane angle of PhPs is 900.Moreover,when graphene surface plasmon sources are placed at the top or bottom ofα-MoO_(3) inα-MoO_(3)/VO_(2)structure,tunable coupled hyperbolic plasmon-phonon polaritons inside its Reststrahlen bands(RB s)and surface plasmonphonon polaritons outside its RBs can be achieved.In addition,the above-mentionedα-MoO_(3)-based structures also lead to actively tunable anisotropic spontaneous emission(SE)enhancement.This study may be beneficial for realization of active tunability of both PhPs and SE ofα-MoO_(3),and facilitate a deeper understanding of the mechanisms of anisotropic light-matter interaction inα-MoO_(3) using functional materials.

关键词： light-matter interaction hyperbolic material phase change material graphene

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Self-reaction of initial active groups in coal

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International Journal of Mining Science and Technology 2012年第2期22卷 169-175页

作者： Qi Xuyao Wang Deming James A Milke zhong xiaoxing State Key Laboratory of Coal Resources and Mine Safety School of Safety EngineeringChina University of Mining&TechnologyXuzhou 221008China Department of Fire Protection Engineering University of Maryland.College ParkMD 20742USA

For further understanding of self-heating of coal,we tested the reactions of seven different ranks of coal under inert atmosphere.In the test,50-gram of coal sample ranged from 0.18 mm to 0.38 mm was put into a special designed copper reaction vessel and let pure nitrogen to flow into the coal sample from the bottom at a rate of 100 mL/min.The programmed temperature enclosure was run at a programmed rate of 0.8 °C/min.The concentration of the carbon oxides and the coal temperature were tested.The results show that the coal reactions under inert atmosphere can generate CO and CO2.The reactions under inert atmosphere are affected by coal ranks,initial pore structure of coal and sulfur content.For low ranks of coal,the productions of carbon oxides are piecewise.The coal temperature is lower than the surrounding temperature throughout the reactions under inert atmosphere,but it rises quickly and reaches a crossing point temperature in the later stage under dry-air atmosphere.Based on the analysis,it indicates the self-reaction of initial active groups exists in the self-heating of coal besides the reactions in the two parallel reactions model.Spontaneous combustion of coal is due to both the oxidation heat accumulation and the chain reaction.A new reaction model of self-heating of coal was proposed.

关键词：反应容器活性基团煤样惰性气氛环境温度碳氧化物反应模型特殊设计

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承压破碎煤体应变和孔渗演化机制与模型研究

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煤田地质与勘探 2024年第5期52卷 37-45页

作者：李磊卢守青褚廷湘仲晓星刘重阳 REN Ting 华北科技学院矿山安全学院北京101601 青岛理工大学机械与汽车工程学院山东青岛266520 中国矿业大学安全工程学院江苏徐州221116 济南热电集团山东济宣能源有限公司山东济南250108 澳大利亚伍伦贡大学土木采矿与环境工程学院新南威尔士伍伦贡2522

采空区垮落带遗煤区域作为煤、氧低温反应的主要场所,其应变、孔隙率和渗透率演化模型的研究对深入认识煤自燃发展过程与规律有重要意义。基于团队自主研发的承压破碎煤体气体渗流实验装置,开展了单一粒径与混合粒径煤体承压渗流过程应... 详细信息

采空区垮落带遗煤区域作为煤、氧低温反应的主要场所,其应变、孔隙率和渗透率演化模型的研究对深入认识煤自燃发展过程与规律有重要意义。基于团队自主研发的承压破碎煤体气体渗流实验装置,开展了单一粒径与混合粒径煤体承压渗流过程应变、孔隙率和渗透率演化规律研究。对不同粒径下的应变、孔隙率和渗透率随应力变化情况进行分析,结果显示:相关变化过程可以分为2个阶段,即轴向应力≤6MPa时的线性变化阶段与>6MPa时的指数函数变化阶段,初步表明破碎煤体的变形、孔隙率和渗透率的变化机制一致、同粒径无关,轴向应力=6MPa时的状态属于关键节点状态,其对应的应变、孔隙率和渗透率分别承接着各自上下2种不同的变化机制;轴向应力≤6MPa和>6MPa条件下三者变化的主要原因分别是颗粒的压缩作用和滑移填充作用;轴向应力=6MPa时不同粒径破碎煤体承压过程中的应变、孔隙率和渗透率分别同各自的应变、孔隙率、渗透率变化路径有一一映射关系,据此建立了相应的应力-应变、应力-孔隙率和应力-渗透率关系的模型;模型对比、验证结果表明,所建模型虽源于多种粒径破碎煤体实验,但摆脱了粒径因素的影响,同实验结果有着良好的匹配性,达到了较为理想的效果。相关研究成果可为采空区煤自燃早期预防与控制提供科学依据。

关键词：破碎煤体承压气体渗流应变孔隙率渗透率

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海藻酸钠改性垃圾焚烧底灰-矿渣基胶凝堵漏材料研究

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煤炭学报 2024年第3期49卷 1475-1487页

作者：窦国兰简赫达仲晓星秦波涛刘根张恬中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室江苏徐州221116 中国矿业大学安全工程学院江苏徐州221116

针对传统矿用水泥基堵漏材料存在的收缩开裂、高能耗及高碳排放的问题,探索采用海藻酸钠(SA)交联金属离子,制备SA改性垃圾焚烧底灰(MSWI-BA)-粒化高炉矿渣(GBFS)基胶凝堵漏材料(SWM)。通过抗压强度和凝结时间的测试,确定了最佳水固比为... 详细信息

针对传统矿用水泥基堵漏材料存在的收缩开裂、高能耗及高碳排放的问题,探索采用海藻酸钠(SA)交联金属离子,制备SA改性垃圾焚烧底灰(MSWI-BA)-粒化高炉矿渣(GBFS)基胶凝堵漏材料(SWM)。通过抗压强度和凝结时间的测试,确定了最佳水固比为0.4。通过胶凝材料在不同温度下的抗压强度、收缩率及裂缝形貌的分析,探究了SA改性对胶凝材料的耐高温性能的影响,结果表明SA改性后,胶凝材料的耐高温性得到了改善,受热后改性胶凝材料表面裂缝明显减少,收缩率较改性前最大降低了26.5%,在400℃受热后,剩余抗压强度仍高达17.25 MPa。结合微观形貌、孔结构性能和热分析实验,探究了SA改性胶凝材料的形成机理,结果表明,SA改性MSWI-BA-GBFS基胶凝堵漏材料通过SA与底物中的Ca^(2+)/Al^(3+)的配位交联与碱激发底物形成的硅铝酸盐共价网络协同作用,细化孔径,减小孔容,在受热后保持基体结构的完整性,从而改善胶凝材料的抗收缩开裂性。堵漏风模拟实验结果表明,水固比0.4的SA改性MSWI-BA-GBFS基胶凝堵漏材料的堵漏性能优于矿用水泥基材料,表现出较好的堵漏性能。SA改性MSWI-BA-GBFS基胶凝堵漏材料的研制不仅为城市垃圾焚烧底灰的资源化利用提供了有效途径,还提供了一种抗压强度高、抗收缩开裂且耐高温的可以完全替代传统矿用水泥基堵漏材料的环保防灭火材料。

关键词：海藻酸钠垃圾焚烧底灰胶凝材料堵漏风防灭火

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Prevention and control of coalfield fire technology:A case study in the Antaibao Open Pit Mine goaf burning area,China

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International Journal of Mining Science and Technology 2012年第5期22卷 657-663页

作者： Cao Kai zhong xiaoxing Wang Deming Shi Guoqing Wang Yanming Shao Zhenlu School of Safety Engineering China University of Mining & Technology Xuzhou 221008 China state Key Laboratory of Coal Resources and Mine Safety China University of Mining & Technology Xuzhou 221008 China

It is very difficult to clearly detect the location of a burning area in a coal mine since it is hidden underground.So we conducted research on the distribution of the burning area before controlling it.Firstly,the original drilling technique was used to analyze and determine the loose and scope of caving of burning area through field test,and then obtained the gases and the temperature data in this area were according to the borehole data.By analyzing these data,we found out that the location of burning area concentrated in the loose and caving area;and finally,the location and development of the burning area within the tested area were accurately determined.Based on this theory,we used the ground penetrating radar(GPR) to find out the loose and caving scale in the burning area during the control process of the burning area,and then located the fire-extinguishing boreholes within target which we used to control burning fire in the section.A mobile comprehensive fire prevention and extinguishing system based on the three-phase foam fire prevention and control technique was then adopted and conducted in the burning area which took only 9 months to extinguish the 227,000 m 2 of burning area of 9# coal.This control technology and experience will provide a very important reference to the control of other coalfield fire and hillock fire in the future.

关键词：控制过程燃烧区钻井技术面积分煤田预防采空区露天矿

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Characteristics of oxygen consumption of coal at programmed temperatures

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Mining Science and Technology 2010年第3期20卷 372-377页

作者： QI Xuyao WANG Deming zhong xiaoxing GU Junjie XU Tao State Key Laboratory of Coal Resources and Safe Mining School of Safety EngineeringChina University of Mining&TechnologyXuzhou 221008China

Oxygen consumption is an important index of coal oxidation.In order to explore the coal-oxygen reaction,we developed an experimental system of coal spontaneous combustion and tested oxygen consumption of differently ranked coals at programmed temperatures.The size of coal samples ranged from 0.18~0.42 mm and the system heat-rate was 0.8℃/min.The results show that, for high ranked coals,oxygen consumption rises with coal temperature as a piecewise non-linear process.The critical coal temperature is about 50℃.Below this temperature,oxygen consumption decreases with rising coal temperatures and reached a minimum at 50℃,approximately.Subsequently,it begins to increase and the rate of growth clearly increased with temperature.For low ranked coals,this characteristic is inconspicuous or even non-existent.The difference in oxygen consumption at the same temperatures varies for differently ranked coals.The results show the difference in oxygen consumption of the coals tested in our study reached 78.6%at 100℃.Based on the theory of coal-oxygen reaction,these phenomena were analyzed from the point of view of physical and chemical characteristics,as well as the appearance of the coal-oxygen complex.From theoretical analyses and our experiments,we conclude that the oxygen consumption at programmed temperatures reflects the oxidation ability of coals perfectly.

关键词： oxygen consumption differently ranked coals programmed temperatures piecewise non-linear process oxidation ability

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Metabolic and proteostatic differences in quiescent and active neural stem cells

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Neural Regeneration Research 2024年第1期19卷 43-48页

作者： Jiacheng Yu Gang Chen Hua Zhu Yi zhong Zhenxing Yang Zhihong Jian xiaoxing Xiong Department of Neurosurgery Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Adult neural stem cells are neurogenesis progenitor cells that play an important role in neurogenesis.Therefore,neural regeneration may be a promising target for treatment of many neurological illnesses.The regenerative capacity of adult neural stem cells can be chara cterized by two states:quiescent and active.Quiescent adult neural stem cells are more stable and guarantee the quantity and quality of the adult neural stem cell pool.Active adult neural stem cells are chara cterized by rapid proliferation and differentiation into neurons which allow for integration into neural circuits.This review focuses on diffe rences between quiescent and active adult neural stem cells in nutrition metabolism and protein homeostasis.Furthermore,we discuss the physiological significance and underlying advantages of these diffe rences.Due to the limited number of adult neural stem cells studies,we refe rred to studies of embryonic adult neural stem cells or non-mammalian adult neural stem cells to evaluate specific mechanisms.

关键词： adult neurogenesis cell metabolic pathway cellular proliferation neural stem cell niches neural stem cells neuronal differentiation nutrient sensing pathway proteostasis

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Crossing point temperature of coal

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Mining Science and Technology 2011年第2期21卷 255-260页

作者： Qi xuyao Deming Wang James A. Milke xiaoxing zhong State Key Laboratory of Coal Resources and Safe Mining Faculty of Safety Engineering China University of Mining ＆ Technology Xuzhou 221008 China Department of Fire Protection Enguneering University of Maryland College Park MD20742 USA

进一步的理解煤自我加热被调查煤的不同等级的交叉的点温度(CPT ) 获得。测试为煤用一个自我设计的试验性的系统被执行自我加热。50 g (???

关键词：煤炭自燃反应温度交叉点水分含量实验条件空气流速温度记录仪彩色显像管

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充填浆液的产气测试及对CO传感器监测的影响

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中国安全科学学报 2023年第10期33卷 176-182页

作者：周昆孙希贤马豪悦刘施恩魏林海仲晓星中国矿业大学安全工程学院江苏徐州221116 中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室江苏徐州221116 山东丰源远航煤业有限公司北徐楼煤矿山东枣庄277300

针对采空区充填浆液因发生物化反应后产生干扰气体,引起矿用电化学CO传感器误报警的问题,基于浆液的氧化周期、产气特性、反应后成分的X射线衍射(XRD)及充填产生气体对矿用电化学CO传感器的交叉干扰等测试,研究煤矸石、粉煤灰、普通硅... 详细信息

针对采空区充填浆液因发生物化反应后产生干扰气体,引起矿用电化学CO传感器误报警的问题,基于浆液的氧化周期、产气特性、反应后成分的X射线衍射(XRD)及充填产生气体对矿用电化学CO传感器的交叉干扰等测试,研究煤矸石、粉煤灰、普通硅酸盐水泥和矿井水以65.5∶4.5∶10∶20比例配置成的充填浆液的产气特性,探究充填产生气体对矿用电化学CO传感器的影响特征。结果表明:采空区充填浆液在物化反应过程中会消耗O 2和CO 2,且会产生H 2、CO和CH 4;其中O 2和CO的体积分数变化与煤矸石氧化有关,CH 4的体积分数变化与煤矸石中甲烷解吸有关,CaO和CO 2的反应会导致CO 2体积分数的降低,粉煤灰中的铝粉在碱性环境中反应会产生H 2,且H 2是造成矿用电化学CO传感器误报警的主要因素,并对矿用电化学CO传感器检测结果呈正交叉干扰。

关键词：充填浆液产气特性电化学CO传感器误报警干扰因子

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煤矿热动力重大灾害的不确定性风险特性研究

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采矿与安全工程学报 2023年第4期40卷 826-837页

作者：王德明张伟王和堂仲晓星邵振鲁王晨光中国矿业大学安全工程学院江苏徐州1221116 中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室江苏徐州221116

煤炭井工开采面临着地质构造和作业环境多变、灾害类型多样等复杂问题,导致以热动力灾害为主的煤矿重特大事故时有发生,已有研究和防控体系主要针对热动力灾害的确定性问题,对不确定性风险则认识不足。为此,本文统计分析了2000年以来发... 详细信息

煤炭井工开采面临着地质构造和作业环境多变、灾害类型多样等复杂问题,导致以热动力灾害为主的煤矿重特大事故时有发生,已有研究和防控体系主要针对热动力灾害的确定性问题,对不确定性风险则认识不足。为此,本文统计分析了2000年以来发生的煤矿重特大事故特点,重点研究热动力重大灾害的不确定性风险类型和特性。分析认为,煤矿热动力灾害不确定性风险涵盖已知和未知两种。通过对国内外煤矿热动力重大事故的系统总结,并依据火灾(爆炸)三要素,将热动力重大灾害的不确定性分为3类:一是可燃物的来源与变化,如瓦斯来源异常和涌出量变化,瓦斯与煤(含煤尘)复合可燃物的相互作用,违规使用的矿用自燃材料等;二是未知的点火源特性与类型,如采掘装备与岩石间的摩擦撞击和各类电器、机械、带静电材料的放电点火特性不明,采掘过程中顶板压力变化造成引燃含瓦斯空气的点火源类型未知等;三是不合理的通风与控风,如通风不合理造成瓦斯超限或灾变时期的风流紊乱,控风不当造成二次爆炸等。剖析近年来我国八宝煤业、美国UBB煤矿、土耳其索玛煤矿发生的国内外最严重的热动力灾害事故,阐明这些事故的不确定性风险特性,并提出防控不确定性风险的相关对策。

关键词：热动力灾害瓦斯爆炸矿井火灾点火源通风可燃物不确定性风险

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