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International Journal of Mining Science and Technology 2024年第6期34卷 855-866页

作者： Lingyun Liu Chuilei Kong Hongyu Zhao fangqin lu Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining Huainan 232001China Department of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232001China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

This study delves into the intricate relationship between iron(Fe)content in kaolinite and its impact on the adsorption behavior of sodium *** effects of different iron concentrations on adsorption energy,hydrogen bond kinetics and adsorption efficiency were studied through simulation and experimental *** results show that the presence of iron in the kaolinite structure significantly improves the adsorption capacity of sodium *** samples with high iron content have better adsorption properties,lower adsorption energy levels and shorter and stronger hydrogen bonds than pure *** optimal concentration of oleic acid ions for achieving maximum adsorption efficiency was identified as 1.2 mmol/L across different kaolinite *** this concentration,the adsorption rates and capacities reach their peak,with Fe-enriched kaolinite samples exhibiting notably higher flotation recovery *** optimal concentration represents a balance between sufficient oleic acid ion availability for surface interactions and the prevention of self-aggregation phenomena that could hinder *** study offers promising avenues for optimizing the flotation process in mineral processing applications.

关键词： Iron Influence Sodium Oleate Adsorption Kaolinite Surfaces Molecular Interaction Analysis Flotation Efficiency Optimization

Technical alternatives for coke oven gas utilization in China: A comparative analysis of environment-economic-strategic perspectives

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Environmental Science and Ecotechnology 2024年第5期21卷 168-177页

作者： Zichen Di Feixia Lei Jiankai Jing Hao Peng Xi lu fangqin Cheng Institute of Resources and Environmental Engineering Shanxi UniversityTaiyuan030006PR China School of Environment State Key Joint Laboratory of Environment Simulation and Pollution ControlTsinghua UniversityBeijing100084PR China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084PR China

China is the largest coke producer and *** is a pressing need to address the high emissions of air pollutants and carbon dioxide associated with traditional coking *** the nation pursues a transition towards carbon neutrality,expanding supply chains for coking plants to produce hydrogen,methanol,and other green alternatives has garnered significant ***,the relative advantages of these strategies have remained *** this study,we integrate a life cycle assessmenteconomic analysis-scenario analysis model to evaluate various coke oven gas(COG)utilization routes(COGtM:COG-to-methanol,COGtLNG:COG-to-liquefied natural gas,COGtSA:COG-to-synthetic ammonia,and COGtH:COG-to-hydrogen).The results indicate that COGtSA emerges as the preferred option for balancing environmental and economic ***,COGtM demonstrates economic viability but is associated with higher environmental *** being recognized as a significant strategic direction under carbon neutrality initiatives,COGtH faces economic feasibility and risk resilience *** encounters both financial and environmental challenges,necessitating strategic development from an energy security *** projected coking capacity is anticipated to experience a slight increase in the mid-term yet a significant decline in the long term,influenced by steel production *** potential future markets,COGtM is estimated to potentially capture a maximum market share of 16e34%in the methanol ***,against the backdrop of continuously expanding potential demand for hydrogen,COGtH holds advantages as a transitional solution,but in the long run,it can only meet a small portion of the *** can meet 7e14%of market demand and emerges as the most viable pathway from the viewpoint of balancing environmental and economic aspects and covering future markets.

关键词： Coke oven gas Life cycle assessment Economic analysis Comprehensive benefits Transformation strategy

Efficacy of mild moxibustion combined with surgery for meniscal injury and its effect on TGF-β1 and PDGF levels in the fluid of knee joint

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Journal of Acupuncture and Tuina Science 2022年第5期20卷 406-411页

作者： lu fangqin MAO Zhijuan CHEN Lijuan CHEN Xuexian KONG Xiehe Nantong Hospital of Traditional Chinese Medicine Jiangsu ProvinceNantong 226001China 不详

Objective To observe the efficacy of mild moxibustion combined with arthroscopic meniscal repair in the treatment of meniscal injury and to explore its action *** Ninety-eight patients with meniscal injury were divided into a surgery group and a moxibustion plus surgery group by the random number table method,with 49 cases in each *** groups received arthroscopic meniscal repair,and the moxibustion plus surgery group was treated with add-on mild *** Lysholm score,visual analog scale(VAS)score,and mobility of the affected knee were measured before and after treatment,and transforming growth factor(TGF)-β1 and platelet-derived growth factor(PDGF)levels were measured in the fluid of the affected knee *** healing of the meniscus was recorded at a follow-up visit 3 months after the *** After treatment,the Lysholm score increased,the VAS score decreased in both groups,and the intra-group differences in both groups were statistically significant(Plus surgery group than in the surgery group,and the VAS score was lower in the moxibustion plus surgery group than in the surgery *** differences between groups in both scores were statistically significant(Plus surgery group than in the surgery group(Pluid of the knee joint increased in both groups(Pluid of the affected knee joint were higher in the moxibustion plus surgery group than in the surgery group(Plus surgery group was significantly better than that in the surgery group at the follow-up visit 3 months after the surgery(Plusion The effect of mild moxibustion combined with arthroscopic meniscal repair is be

关键词： Moxibustion Therapy Moxa Stick Moxibustion Arthroscopic Surgery Meniscus Injuries Pain Measurement Visual Analog Scale Transforming Growth Factor Beta1 Platelet-derived Growth Factor

中概股企业私有化退市决策模型:基于价值低估假说

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系统管理学报 2020年第5期29卷 915-923页

作者：谭庆美耿佩璇卢防勤天津大学管理与经济学部天津300072

基于中概股企业私有化退市背景,建立继续海外上市与私有化退市两种情形下的企业价值模型,模拟控股股东私有化退市决策的权衡过程。结果表明:存在一个净现金流临界值,当中概股企业的净现金流大于该临界值时,继续海外上市时的企业价值更大... 详细信息

基于中概股企业私有化退市背景,建立继续海外上市与私有化退市两种情形下的企业价值模型,模拟控股股东私有化退市决策的权衡过程。结果表明:存在一个净现金流临界值,当中概股企业的净现金流大于该临界值时,继续海外上市时的企业价值更大,控股股东应选择继续海外上市;反之应选择私有化退市。中概股企业继续海外上市的资本成本率和上市维持成本越高、获取净现金流的能力越弱,净现金流临界值越高。私有化退市后的资本成本率越低以及获取净现金流的能力越强,净现金流临界值越高。最后,利用Matlab进行仿真分析并以智联招聘私有化退市为对象进行案例分析,验证了理论模型所得结论的合理性与可行性。

关键词：中概股私有化退市价值低估假说净现金流临界值智联招聘

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pH值对微细高岭石颗粒聚团特性的影响机理

中国矿业大学学报 2016年第5期45卷 1022-1029页

作者：李伟荣刘令云闵凡飞陆芳琴安徽理工大学材料科学与工程学院安徽淮南232001

为掌握pH值对不同粒度微细高岭石颗粒聚团沉降特性的影响机理,对不同pH值溶液化学环境下的微细高岭石颗粒表面电动电位、官能团和聚团形态进行了测试分析及聚团沉降实验.结果表明:当pH6时,D5011.78μm颗粒聚团行为受pH值和粒度影响较小... 详细信息

为掌握pH值对不同粒度微细高岭石颗粒聚团沉降特性的影响机理,对不同pH值溶液化学环境下的微细高岭石颗粒表面电动电位、官能团和聚团形态进行了测试分析及聚团沉降实验.结果表明:当pH6时,D5011.78μm颗粒聚团行为受pH值和粒度影响较小.溶液pH值和粒度的改变导致高岭石颗粒表面荷电特性、表面官能团、水化特性、解离特性和聚团形式变化是其聚团与分散的微观机理,从而对其聚团沉降效果产生较明显影响.

关键词：高岭石 pH值粒度沉降

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微细高岭石颗粒表面水化作用机理研究

中国矿业大学学报 2016年第4期45卷 814-820页

作者：刘令云陆芳琴闵凡飞张明旭安徽理工大学材料科学与工程学院安徽淮南232001

为掌握微细高岭石颗粒表面水化作用机理,利用流变仪测定了微细高岭石在不同离子溶液中分散体系的黏度.基于爱因斯坦黏度方程,建立了矿物颗粒表面水化度测定方法,分析了Na+,K+,Ca2+,Mg2+等离子对高岭石颗粒表面水化度的影响规律.结果表明... 详细信息

为掌握微细高岭石颗粒表面水化作用机理,利用流变仪测定了微细高岭石在不同离子溶液中分散体系的黏度.基于爱因斯坦黏度方程,建立了矿物颗粒表面水化度测定方法,分析了Na+,K+,Ca2+,Mg2+等离子对高岭石颗粒表面水化度的影响规律.结果表明:高岭石颗粒表面水化度在去离子水中为131.895,在浓度为0.001,0.010,0.100mol/L不同离子溶液中分别为NaCl溶液中的160.714,123.397,109.834,KCl溶液中的141.761,106.171,93.071,CaCl_2溶液中的118.854,93.141,86.800和MgCl2溶液中的95.195,82.764,57.234,水化度随溶液中离子浓度的增加而逐渐减小,浓度较低时Na^+,K^+离子有利于水化膜的形成,颗粒表面水化度最高;煤泥水中常见阳离子对高岭石颗粒表面水化膜的弱化能力依次为:Na^+

关键词：高岭石水化机理离子溶液水化度

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破碎解理方式对高岭石颗粒电动特性的影响

中国矿业大学学报 2014年第4期43卷 689-694页

作者：刘令云闵凡飞张明旭宋少先陆芳琴安徽理工大学材料科学与工程学院安徽淮南232001 武汉理工大学资源与环境工程学院湖北武汉430070

为了掌握不同粒度高岭石颗粒的电动特性,利用ZetaProbe分析仪测定了其在溶液中的表面ζ电位,分析了不同解理方式对颗粒各面面积的影响,研究了破碎解理方式对高岭石颗粒在溶液中电动特性的影响规律.结果表明:D_(50)分别为0.30,4.65和7.95... 详细信息

为了掌握不同粒度高岭石颗粒的电动特性,利用ZetaProbe分析仪测定了其在溶液中的表面ζ电位,分析了不同解理方式对颗粒各面面积的影响,研究了破碎解理方式对高岭石颗粒在溶液中电动特性的影响规律.结果表明:D_(50)分别为0.30,4.65和7.95 mm 3种高岭石颗粒的等电点(IEP)随粒度的增加呈先降后增的趋势;3.00

关键词：高岭石电动特性破碎解理粒度酸碱响应系数

不同价态Fe在煤系高岭石中晶格取代的DFT研究

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中国矿业大学学报 2019年第4期48卷 903-910页

作者：刘令云闵凡飞陈军张明旭陆芳琴安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室安徽淮南232001 安徽理工大学材料科学与工程学院安徽淮南232001

为探索不同价态Fe在高岭石中晶格取代的形式及其对高岭石界面结构性质的影响,采用密度泛函理论(DFT)方法对不同价态Fe在高岭石晶体中的晶格取代进行了模拟计算,通过晶格取代能计算分析Fe元素的3种晶格取代的难易程度,并通过计算能带结... 详细信息

为探索不同价态Fe在高岭石中晶格取代的形式及其对高岭石界面结构性质的影响,采用密度泛函理论(DFT)方法对不同价态Fe在高岭石晶体中的晶格取代进行了模拟计算,通过晶格取代能计算分析Fe元素的3种晶格取代的难易程度,并通过计算能带结构和前线轨道,分析了Fe元素的3种晶格取代对高岭石界面结构性质的影响.结果表明:不同价态Fe在高岭石晶体中的晶格取代形式主要有Fe2+取代铝氧八面体中的Al^3+(Fe^2+→Al^3+)、Fe^3+取代铝氧八面体中的Al^3+(Fe^3+→Al^3+)及Fe^3+取代硅氧四面体中的Si^4+(Fe^3+→Si^4+)3种,其取代程度由易到难为:Fe^2+→Al^3+> Fe^3+→Si^4+> Fe^3+→Al^3+;高岭石经过不同价态Fe元素取代后,将导致高岭石晶格的能带带隙减小,最高占有分子轨道(HOMO)和最低占有分子轨道(luMO)的反应活性发生改变.通过穆斯堡尔(Mossbauer)谱仪对淮北矿区煤系高岭石中的铁占位进行了分析,淮北矿区煤系高岭石中的Fe占位主要为六配位Fe^2+和四配位Fe^3+,及极少量的六配位Fe^3+,3种Fe的含量从大到小为:六配位Fe^2+>四配位Fe^3+>六配位Fe^3+;同时,Mossbauer谱测试结果进一步验证了DFT计算的正确性.

关键词：煤系高岭石 Fe元素穆斯堡尔谱晶格取代密度泛函理论

十二胺在Fe^(2+)掺杂高岭石层面吸附的密度泛函研究

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中国矿业大学学报 2023年第3期52卷 596-606页

作者：凌云嘉陈军孙宇储鑫霞陆芳琴闵凡飞安徽理工大学材料科学与工程学院安徽淮南232001

为探究Fe^(2+)掺杂对十二胺分子(DDA)及其阳离子(DDA+)在高岭石层面吸附的微观影响机制,对DDA和DDA+在Fe^(2+)掺杂高岭石(001)及(■)面的吸附进行了密度泛函理论(DFT)计算.结果表明:DDA和DDA+在Fe^(2+)掺杂高岭石层面的吸附机理为氢键... 详细信息

为探究Fe^(2+)掺杂对十二胺分子(DDA)及其阳离子(DDA+)在高岭石层面吸附的微观影响机制,对DDA和DDA+在Fe^(2+)掺杂高岭石(001)及(■)面的吸附进行了密度泛函理论(DFT)计算.结果表明:DDA和DDA+在Fe^(2+)掺杂高岭石层面的吸附机理为氢键和范德华静电引力共同作用.DDA在Fe^(2+)掺杂高岭石层面吸附以氢键作用为主,范德华静电引力作用为辅;DDA+在Fe^(2+)掺杂高岭石层面吸附以范德华静电引力作用为主,氢键作用为辅.Fe^(2+)的杂质缺陷增强了高岭石(001)面的表面活性,对(■)面的表面活性影响较小.研究结果可为进一步研究煤泥水中黏土颗粒表面的真实吸附状态及煤泥水高效处理药剂的设计提供理论依据.

关键词：高岭石密度泛函理论十二胺 Fe^(2+)掺杂杂质缺陷

High-efficiency prediction method for helicopter global/ground noise based on near-field acoustic holography

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Chinese Journal of Aeronautics 2024年第7期37卷 271-284页

作者： Mengxue SHAO Yang lu Xice XU Jiaxin lu National Key Laboratory of Helicopter Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Noise reduction program design is an effective approach that relies on efficient noise prediction for reducing ground noise during *** existing noise prediction methods have the limitations of being computationally expensive or only applicable to *** this paper,a High-Efficiency Prediction Method(HEPM)for helicopter global/ground noise based on near-field acoustic holography is *** HEPM can predict the global noise based on acoustic modal analysis and has the advantages of high prediction accuracy and low time *** process is given as follows:firstly,the rotor noise on the holographic surface in the specified flight is obtained by simulations or ***,the global noise model,which maps time-domain noise to acoustic modes,is established based on near-field acoustic holography and Fourier acoustic analysis ***,combined with acoustic modal amplitude,the model established enables efficiently predicting the global/ground noise in the corresponding flight *** verify the accuracy of the prediction method,a simulation study is conducted in hovering and forward flight states using a model helicopter with a 2-meter rotor and Rotor Body Interaction(ROBIN)*** comparison of HEPM with numerical results shows that the average prediction errors of the global and ground noise are less than 0.3 dB and 0.2 dB,*** a region containing 100000 observers,the computation time of the HEPM is only one-fifth of that of the acoustic hemisphere method,demonstrating the rapidity of the proposed method.

关键词： Helicopter Rotor noise prediction Noise abatement procedure design Acoustic modal analysis Near-field acoustic holography