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废旧发泡混凝土定型相变材料制备及热性能研究

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综合智慧能源 2024年第3期46卷 29-34页

作者：孟强田曦熊亚选中国人民解放军63933部队北京100091 北京建筑大学供热供燃气通风及空调工程北京市重点实验室北京100044

为规模化消纳城市固体废弃物,降低废旧发泡混凝土大量堆积对城市生态环境的破坏。提出以废旧发泡混凝土作为骨架材料,对其进行预烧结处理,以Na_(2)CO_(3)为相变材料制备定型相变材料。结果表明:废旧发泡混凝土可以负载质量分数为45%的Na... 详细信息

为规模化消纳城市固体废弃物,降低废旧发泡混凝土大量堆积对城市生态环境的破坏。提出以废旧发泡混凝土作为骨架材料,对其进行预烧结处理,以Na_(2)CO_(3)为相变材料制备定型相变材料。结果表明:废旧发泡混凝土可以负载质量分数为45%的Na_(2)CO_(3);差示扫描量热法(DSC)测得该定型相变材料的熔化潜热为126.7 J/g;X射线衍射法(XRD)和傅里叶变换红外法(FT-IR)表明,骨架材料和相变材料之间有良好的化学相容性;激光导热分析法(LFA)测得该定型相变材料的导热系数最大为0.24 W/(m·K)。

关键词：蓄热固体废弃物定型相变材料发泡混凝土骨架材料性能

The Fulde-Ferrell-Larkin-Ovchinnikov states in s and d-wave superconductor with spin-dependent bandwidth imbalance on square lattice

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Science China(Physics,Mechanics & Astronomy) 2016年第1期59卷 92-97页

作者： Yong-Hui Wang Qing-qiang meng Yan Chen Department of Physics and State Key Laboratory of Surface Physics Fudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

We study numerically the phase diagram for s and d-wave fermionic superftuidity/superconductivity with spin-dependent band- width imbalance on a two-dimensional square-lattice. We also investigate the spontaneous space symmetry breaking states at low temperatures by solving the Bogoliubov-de Gennes equations. It is found that, the spatial configuration of the order parameter, both the uni-directional Fulde-Ferrell-Larkin-Ovchinnikov （FFLO） states and the two-dimensional FFLO state may show up in the presence of finite spin-dependent bandwidth imbalance. Moreover, we calculate the spectra of local density of states, and the experimental proposals of observing such FFLO states are therefore suggested.

关键词： FFLO state superconductivity superfluidity

The roles of MXenes in developing advanced lithium metal anodes

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Journal of Energy Chemistry 2022年第6期31卷 132-149,I0005页

作者： Nicolas Lucero Dayannara Vilcarino Dibakar Datta meng-qiang Zhao Department of Chemical and Materials Engineering Newark College of EngineeringNew Jersey Institute of TechnologyNewarkNJ 07103USA Jose Marti Stem Academy Union CityNJ 07087USA Department of Mechanical and Industrial Engineering Newark College of EngineeringNew Jersey Institute of TechnologyNewarkNJ 07103USA

Lithium(Li) metal has emerged as the most promising anode for rechargeable Li batteries owing to its high theoretical specific capacities, low negative electrochemical potential, and superior electrical conductivity. Replacing the conventional graphite anodes with Li metal anodes(LMAs) provides great potential to exceed the theoretical limitations of current commercial Li-ion batteries, leading to nextgeneration high-energy–density rechargeable Li metal batteries(LMBs). However, further development of LMAs is hindered by several inherent issues, such as dangerous dendrite growth, infinite volume change, low Coulombic efficiency, and interfacial side reactions. MXenes, a family of two-dimensional(2 D) transition metal carbides and/or nitrides, have recently attracted much attention to address these issues due to their 2D structure, lithiophilic surface terminations, excellent electrical and ionic conductivity, and superior mechanical properties. Herein, an overview of recent advances in the roles of MXenes for stabilizing LMAs is presented. In particular, strategies of utilizing MXenes as the Li hosts, artificial protection layers, electrolyte additives, and for separator modifications to develop stable and dendrite-free LMAs are discussed. Moreover, a perspective on the current challenges and potential outlooks on MXenes for advanced LMAs is provided.

关键词： MXenes 2D materials Lithium dendrites Lithium metal anodes Stability

Devitrification of Al-Ce Amorphous Ribbon Investigated Using In situ High Energy X-ray Diffraction

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 157-162页

作者： Ying-Xi Li Fan-qiang meng Rui Yuan Guo-qiang Huang Dong-Bai Sun Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai519082China School of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou510275China

Metastable phases formed during vitrification or devitrification open an avenue to study the intrinsic structural hierarchy in amorphous *** phase transformation sequence of Al89Ce11 amorphous ribbon was investigated using diff erential scanning calorimetry,in situ high energy X-ray diffraction(HEXRD)and ex situ high-resolution scanning transmission electron *** results reveal the devitrification pathway following the reaction:amorphous→ε-Al_(60)Ce_(11)+fcc-Al→η-Al_(41)Ce_(5)+fcc-Al→Al_(11)Ce_(3)+*** has been found that bothε-Al_(60)Ce_(11)andη-Al_(41)Ce_(5)metastable phases have same Ce-centered 1-6-6-6-1 motif,suggesting that the structural motif can be *** of metastable phase with large unit cell is related to the short-range orders developed during *** heredity provides a new method to tailor the microstructure and properties of Al-based alloys based on genetic mechanism.

关键词： Synchrotron radiation Amorphous alloys Crystallization Phase transformation

无人机倾斜摄影测量在农村房屋不动产测绘中的应用

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测绘与空间地理信息 2024年第5期47卷 151-153页

作者：王玉柱孔娟孟强河南省地质局矿产资源勘查中心河南郑州450053 黄河勘测规划设计研究院有限公司河南郑州450003

简要介绍了倾斜摄影测量技术的基本原理,并论述了该技术在农村房屋不动产权籍调查测绘中的应用。通过实际应用、质量检测、数据分析,明确了该技术在农村房屋不动产测绘中应用的可靠性,为今后在各个行业的广泛应用提供了一定的参考。

关键词：无人机倾斜摄影测量农村房屋不动产测量权籍调查

考虑梁端碰撞和动水压力作用对波形钢腹板连续刚构桥抗震性能影响分析

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工程抗震与加固改造 2024年第2期46卷 77-86页

作者：屈俊童补孟强王卓崔茂俊刘茜雷真云南大学建筑与规划学院云南昆明650504

以西南片区某库区的深水高墩大跨波形钢腹板连续刚构桥为工程背景,考虑梁端碰撞作用、动水压力以及二者同时作用的影响,采用OpenSees代码平台进行建模,并分别建立混凝土腹板连续刚构桥模型进行对比分析。分析天然地震动与人工地震动下... 详细信息

以西南片区某库区的深水高墩大跨波形钢腹板连续刚构桥为工程背景,考虑梁端碰撞作用、动水压力以及二者同时作用的影响,采用OpenSees代码平台进行建模,并分别建立混凝土腹板连续刚构桥模型进行对比分析。分析天然地震动与人工地震动下各个模型的地震响应,对比响应结果以探究梁端碰撞和动水压力对波形钢腹板桥的抗震性能影响。结果表明:动水压力对于桥梁自振特性影响主要在第十阶振型之后,梁端碰撞主要影响桥梁第四阶~七阶振型;动水压力会明显增加桥梁动力响应峰值;梁端碰撞作用会降低桥梁纵桥向位移响应,但会增大墩底弯矩;两者共同作用时会降低桥墩的位移与剪力,但会增加墩底的弯矩。

关键词：波形钢腹板桥 OpenSees 梁端碰撞动水压力动力响应

EVA/MPE/DK-HNTs复合材料的制备及其性能

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合成树脂及塑料 2024年第1期41卷 18-23页

作者：李薇常子衡刘子涵朱硕楠孟强杜敬亮杜永刚石家庄铁道大学材料科学与工程学院河北石家庄050043 河北尚华新材料股份有限公司河北石家庄050043 河北省交通工程与环境协同发展新材料重点实验室河北石家庄050043

以9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)、硅烷偶联剂KH570为原料合成了DOPOKH570,并接枝于埃洛石纳米管表面,制备了端基含DOPO的埃洛石纳米管(DK-HNTs)。通过傅里叶变换红外光谱和X射线光电子能谱表征了DK-HNTs的化学组成及结... 详细信息

以9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)、硅烷偶联剂KH570为原料合成了DOPOKH570,并接枝于埃洛石纳米管表面,制备了端基含DOPO的埃洛石纳米管(DK-HNTs)。通过傅里叶变换红外光谱和X射线光电子能谱表征了DK-HNTs的化学组成及结构。采用熔融共混法制备了乙烯-乙酸乙烯酯共聚物/茂金属聚乙烯/DK-HNTs复合材料,考察了DK-HNTs用量对复合材料性能的影响。结果表明:少量DK-HNTs在复合材料中可以均匀分散;当DK-HNTs用量为5%(w)时,复合材料拉伸强度、拉伸断裂标称应变、残炭量分别为21.08 MPa,735%,4.20%(w)。此外,DK-HNTs的加入使复合材料的加工流动性略有下降。

关键词：乙烯-乙酸乙烯酯共聚物埃洛石纳米管复合材料力学性能

Effect of Substrate Bias on Microstructure and Properties of Tetrahedral Amorphous Carbon Films

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Journal of Materials Science & Technology 2003年第Z1期19卷 109-111页

作者： Jiaqi ZHU Jiecai HAN Songhe meng qiang LI Manlin TAN Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China Center of Composite Materials Harbin Institute of Technology Harbin 150001 China

The microstructure and properties of tetrahedral amorphous carbon (ta-C) films deposited by the filtered cathodic vacuum arc technology has been investigated by visible Raman spectroscopy, AFM and Nano-indentor. The Raman spectra have been fitted with a single skewed Lorentzian lineshape described by BWF function defining coupling coefficient, which characterizes the degree of asymmetry and is correlated with the sp3 content. When the substrate bias is -80 V, the sp3 content is the most and simultaneously the coupling coefficient is the least, following with the minimum root mean square surface roughness (Rq=0.23 nm) and the highest hardness (51.49 GPa), Young′s modulus (512.39 GPa), and critical scratching load (11.72 mN). As the substrate bias is increased or decreased, the sp3 content and other properties lower correspondingly.

关键词： Tetrahedral amorphous carbon, Filtered cathodic vacuum arc, Substrate bias

ADP/A-SEP复配体系对EVA/MPE线缆复合材料的改性研究

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塑料工业 2024年第1期52卷 147-153页

作者：常子衡李薇刘志成陈彪孟强杜敬亮杜永刚石家庄铁道大学材料科学与工程学院河北石家庄050043 河北尚华塑料科技有限公司河北石家庄051130 河北省交通工程与环境协同发展新材料重点实验室河北石家庄050043

采用乙烯基三乙氧基硅烷(A151)对海泡石(SEP)进行表面处理制得A-SEP,并同二乙基次磷酸铝(ADP)复配用作乙烯-醋酸乙烯共聚物(EVA)/茂金属聚乙烯(MPE)线缆复合材料的阻燃改性剂。考察了ADP/A-SEP复配体系组成对EVA/MPE线缆复合材料拉伸性... 详细信息

采用乙烯基三乙氧基硅烷(A151)对海泡石(SEP)进行表面处理制得A-SEP,并同二乙基次磷酸铝(ADP)复配用作乙烯-醋酸乙烯共聚物(EVA)/茂金属聚乙烯(MPE)线缆复合材料的阻燃改性剂。考察了ADP/A-SEP复配体系组成对EVA/MPE线缆复合材料拉伸性能、阻燃性能和加工流动性的影响。结果表明,ADP虽能明显改善EVA/MPE线缆复合材料的阻燃性能,但对拉伸性能负面影响较大。A-SEP同ADP具有较好的协效阻燃效果,且能够同时改善EVA/MPE线缆复合材料的拉伸性能。当ADP添加量为25%、A-SEP添加量为3%时,EVA/MPE线缆复合材料的拉伸强度与断裂伸长率分别为11.43 MPa和689%;极限氧指数(LOI)达到32%,初始热降解温度和残炭率分别为352.89℃和5.75%,体积电阻率为2.63×10^(13)Ω·cm。此外A-SEP添加量不超过3%时,其对EVA/MPE/线缆复合材料的加工流动性影响不大。

关键词：乙烯-醋酸乙烯共聚物二乙基次磷酸铝海泡石阻燃性能拉伸性能加工性能