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Research progress on the characterization and repair of graphene defects

International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1179-1190页

作者： Bo-yu Ju wen-shu yang Qiang Zhang Murid Hussain Zi-yang Xiu Jing Qiao Gao-hui Wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Department of Chemical Engineering COMSATS University IslamabadLahore CampusDefence RoadOff Raiwind RoadLahore 54000Pakistan State Key Laboratory of Advanced Welding and Jointing Harbin Institute of TechnologyHarbin 150001China

Graphene has excellent theoretical properties and a wide range of applications in metal-based composites. However, because of defects on the graphene surface, the actual performance of the material is far below theoretical expectations. In addition, graphene containing defects could easily react with a matrix alloy, such as Al, to generate brittle and hydrolyzed phases that could further reduce the performance of the resulting composite. Therefore, defect repair is an important area of graphene research. The repair methods reported in the present paper include chemical vapor deposition, doping, liquid-phase repair, external energy graphitization, and alloying. Detailed analyses and comparisons of these methods are carried out, and the characterization methods of graphene are introduced. The mechanism, research value, and future outlook of graphene repair are also discussed at length. Graphene defect repair mainly relies on the spontaneous movement of C atoms or heteroatoms to the pore defects under the condition of applied energy. The repair degree and mechanism of graphene repair are also different according to different preparations. The current research on graphene defect repair is still in its infancy, and it is believed that the problem of defect evolution will be explained in more depth in the future.

关键词： graphene metal matrix composites defect repair characterization repair mechanism

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Microstructural evolution and thermal conductivity of diamond/Al composites during thermal cycling

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1821-1827页

作者： Ping-ping Wang Guo-qin Chen wen-jun Li Hui Li Bo-yu Ju Murid Hussain wen-shu yang Gao-hui Wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Qiqihar Xiangke New Material Co. Ltd.Qiqihar 161005China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology School of Material Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Beijing Institute of Spacecraft System Engineering Beijing 100094China Department of Chemical Engineering COMSATS University IslamabadLahore CampusDefence RoadOff Raiwind RoadLahore 54000Pakistan

The microstructural evolution and performance of diamond/Al composites during thermal cycling has rarely been *** the present work,the thermal stability of diamond/Al composites during thermal cycling for up to 200 cycles was ***,the thermal conductivity(λ)of the composites was measured and scanning electron microscopy of specific areas in the same samples was carried out to achieve quasi-in situ *** interface between the(100)plane of diamond and the Al matrix was well bonded with a zigzag morphology and abundant needle-like Al4C3 *** contrast,the interface between the(111)plane of diamond and the Al matrix showed weak bonding and debonded during thermal *** debonding length increased rapidly over the first 100 thermal cycles and then increased slowly in the following 100 ***λof the diamond/Al composites decreased abruptly over the initial 20 cycles,increased afterward,and then decreased monotonously once more with increasing number of thermal *** in theλof the Al matrix and the corresponding stress concentration at the diamond/Al interface caused by thermal mismatch,rather than interfacial debonding,may be the main factors influencing the decrease inλof the diamond/Al composites,especially in the initial stages of thermal cycling.

关键词： metal-matrix composites diamond stability thermal mismatch stress

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Efficient aerobic oxidative desulfurization via three-dimensional ordered macroporous tungsten-titanium oxides

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Petroleum Science 2022年第1期19卷 345-353页

作者： Ming Zhang Yu-Jie Fu Chao Wang Yan-Chen Wei Yong-Kang Gao wen-shu yang Lei Fan wen-shuai Zhu Hua-Ming Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013PR China Institute of Environmental Health and Ecological Security School of the Environment and Safety EngineeringJiangsu UniversityZhenjiang212013PR China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou225002PR China

A series of three-dimensional ordered macroporous(3 DOM)W-TiO_(2)catalysts have been prepared through a facile colloidal crystal template *** prepared materials characterized in detail exhibited enhanced catalytic activity in aerobic oxidative desulfurization *** experimental results indicated that the as-prepared materials possessed excellent 3 DOM structure,which is beneficial for the catalytic *** sample 3 DOM W-TiO_(2)-20 exhibited the highest activity in ODS process,and the sulfur removal can reach 98%in 6 ***,the oxidative product was also analyzed in the reaction process.

关键词： Tungsten doped Three-dimensional ordered microporous material Titanium oxide Aerobic oxidative desulfurization Sulfur compounds

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Electrical Discharge Machining of Al2024-65 vol%SiC Composites

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Acta Metallurgica Sinica(English Letters) 2017年第5期30卷 447-455页

作者： wen-shu yang Guo-Qin Chen Ping Wu Murid Hussain Jia-Bing Song Rong-Hua Dong Gao-Hui Wu Department of Materials Science and Engineering HarbinInstitute of TechnologyHarbin 150001China Northwest Institute of Nuclear Technology Xi'an 710024China Department of Chemical Engineering COMSATS Instituteof Information TechnologyM.A.Jinnah BuildingDefenceRoadOff Raiwind RoadLahore 54000Pakistan Beijing Institute of Aerospace Control Devices Beijing 100039China

In the present work, the wire electrical discharge machining（WEDM） process of the 65 vol% SiCp/2024 Al composite prepared by pressure infiltration methods has been investigated. The microstructure of the machined composite was characterized by scanning electron microscope, the average surface roughness（Ra）, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy（TEM） techniques. Three zones from the surface to the interior（melting zone, heat affected zone and un-affected zone） were found in the machined composites, while the face of SiC particles on the surface toward the outside was ‘‘cut＇＇ to be flat. Increase in Al and Si but decrease in C and O were observed in the core areas of the removed particles. Si phase, which was generated due to the decomposition of SiC, was detected after the WEDM process. The irregular and spherical particles were further observed by TEM. Based on the microstructure observation, it is suggested that the machining mechanism of 65 vol% SiCp/2024 Al composite was the combination of the melting of Al matrix and the decomposition of SiC particles.

关键词： Metal matrix composites SiCp/Al composite Metal infiltration Wire electrical discharge machining(WEDM) SiC decomposition Machining mechanism

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Behaviors of Zn2GeO4 under high pressure and high temperature

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Chinese Physics B 2016年第7期25卷 310-315页

作者：杨淑雯彭放李文涛胡启威晏小智雷力李晓东贺端威 Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

The structural stability of Zn2GeO4 was investigated by in-situ synchrotron radiation angle dispersive x-ray diffraction. The pressure-induced amorphization is observed up to 10 GPa at room temperature. The high-pressure and hightemperature sintering experiments and the Raman spectrum measurement firstly were performed to suggest that the amorphization is caused by insufficient thermal energy and tilting Zn–O–Ge and Ge–O–Ge bond angles with increasing pressure,respectively. The calculated bulk modulus of Zn2GeO4 is 117.8 GPa from the pressure-volume data. In general, insights into the mechanical behavior and structure evolution of Zn2GeO4 will shed light on the micro-mechanism of the materials variation under high pressure and high temperature.

关键词： pressure-induced amorphization high pressure and high temperature phase transition x-ray diffraction

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ANALYSIS ON SPATIAL DIFFERENCE OF LAND USECHANGE BASED ON PHYSICAL AND CULTURALLANDSCAPE ATTRIBUTES──A Case Study at Mongolian AutonomousCounty of Qian Gorlos, Jilin Province

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Chinese Geographical Science 2001年第1期11卷 50-56页

作者： HUANG Fang, LIU Xiang-nan, XU Hong-mei, ZHANG shu-wen, ZHANG yang-zhen (Changchun Institute of Geography, the Chinese Academy of Sciences, Changchun 130021, P. R. China School of Urban and Environmental Science, Northeast Normal University, Changchun 13 Changchun Institute of Geography the Chinese Academy of Sciences Changchun P. R. China School of Urban and Environmental Science Northeast Normal University Changchun P. R. China Institute of Resources Science Beijing Normal University Beijing P. R. China

Land use changes are regarded as landscape pattern change driven by many interactive natural and social-economic factors. Different combination of physical geographical elements induced the difference of spatio-temporal pattern of land use change. There are four physical geographical regions in Mongolian Autonomou County of Qian Gorlos of Jilin Province. Based on spatial analysis and statistical analysis, we conclude that the primary pattern of land use and the tendency of land use changes are all different in four physical geographical regions. During 1987 – 1996, the dominant land use change processes were from grassland or forest to arableland, from unused land to paddy and grassland to unused land. Though land use change is mainly affected by social and economic condition in short period, the composite characters of physical geographical elements controls land use dynamic process. The relationship between land use dynamic process and the character of physical geographical units differ in different regions. Possible human impacts on land use change are explored with application of buffer areas of series distance along main roads and radius around main settlements. A few models are built to describe the relationship between land use spatial change rates and distance to road and settlements. According to our result, the relationship with the proximity to roads was a negative liner function, with the change rate decreasing rapidly when moving away from roads. Within a distance of less 7.5km from main traffic lines, land use changes occur red more. The bulk of grassland was apt to be opened up for cultivation around the settlements and the transformation from dryland to paddy occurred within the distance of 1km away from settlements.

关键词： land use change physical geographic region land use dynamic process effective coefficient cultural landscape variable

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基于实物期权的碳税政策对CCS项目投资决策影响研究

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中国人口·资源与环境 2015年第9期25卷 13-20页

作者：林则夫文书洋宋斌中央财经大学管理科学与工程学院北京100081 西南财经大学中国金融研究中心四川成都610074

全球变暖对人类的生存和发展造成了巨大的威胁。作为一个崛起中的大国,节能减排、保护环境是中国不可避免的责任更是可持续发展的要求。碳捕集与封存(CCS)技术可以实现短期大量减排,受到各国重视。CCS项目具有不确定性,投资者在投资过... 详细信息

全球变暖对人类的生存和发展造成了巨大的威胁。作为一个崛起中的大国,节能减排、保护环境是中国不可避免的责任更是可持续发展的要求。碳捕集与封存(CCS)技术可以实现短期大量减排,受到各国重视。CCS项目具有不确定性,投资者在投资过程中具有较高的决策灵活性。本文在考虑CCS投资特点的基础上,建立了基于实物期权CCS项目投资决策模型。大量研究表明碳排放政策是影响投资者决策的重要因素,本文设定税率为政策变量,给出了包含推迟期权价值的CCS项目价值函数。假设使得CCS项目价值为正的最低税率是最佳的税率。以项目价值函数等于零为临界条件求解模型得到临界税率与其他技术经济变量的隐函数。最后,本文结合案例用数值仿真的方法研究了各技术经济变量对临界税率的影响。发现税收政策的有效性主要受到碳交易价格、无风险利率以及CCS项目的投资额的影响。最后根据研究发现提出了政策建议。

关键词：碳捕集与封存实物期权碳排放税投资决策

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绿色金融与经济增长质量:带有资源环境约束的一般均衡模型构建与实证检验

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中国管理科学 2022年第3期30卷 55-65页

作者：文书洋林则夫刘锡良西南财经大学中国金融研究中心四川成都610031 中央财经大学管理科学与工程学院北京100089

深入认识绿色金融对经济发展质量的影响机制、实证检验二者的关系,是科学引导绿色金融体系构建、助力高质量发展的基础,但该领域的理论研究和实证证据都十分有限。本文从绿色金融研究的理论脉络入手,构建了带有资源环境约束和金融部门... 详细信息

深入认识绿色金融对经济发展质量的影响机制、实证检验二者的关系,是科学引导绿色金融体系构建、助力高质量发展的基础,但该领域的理论研究和实证证据都十分有限。本文从绿色金融研究的理论脉络入手,构建了带有资源环境约束和金融部门的一般均衡模型。在模型中,自然资源的“公共物品问题”导致经济增长路径偏离最优水平,而绿色金融机构能够通过优化资本配置,改善经济增长路径,降低稳态中的环境损害水平,提高经济增长的质量。基于理论模型,本文使用2005年至2017年的省级面板数据检验了绿色金融活动与经济增长质量之间的关系,实证证据有力地支持了理论模型的推论。据此,本文指出,发展绿色金融的核心是“绿化”金融机构的运营理念和投资决策,从改善经济体的资源配置状况入手,促进经济的绿色发展。此外,本文的理论模型将绿色金融的研究与经济增长理论结合起来,也为绿色金融的理论体系构建提供了参考。

关键词：绿色金融经济增长质量带有资源环境约束的一般均衡模型面板数据模型

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中国金融业利润过高了吗--基于马克思生息资本理论的分析与实证证据

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经济学家 2020年第6期 95-106页

作者：文书洋牟爽刘锡良西南财经大学中国金融研究中心

在新的历史时期,增强金融服务实体经济的能力是实现经济高质量发展的"必修课"。近年来,关于金融业高利润的争论颇多,中国金融业的利润是否过高?学界尚无评价标准。本文从文献和经济现象出发,提出判断金融业利润是否过高的关键是其对经... 详细信息

在新的历史时期,增强金融服务实体经济的能力是实现经济高质量发展的"必修课"。近年来,关于金融业高利润的争论颇多,中国金融业的利润是否过高?学界尚无评价标准。本文从文献和经济现象出发,提出判断金融业利润是否过高的关键是其对经济发展的影响。在利润平均化的过程中,金融资本在各行业间的择优投资行为,以及资本的不完全流动,共同导致了金融业的高利润。金融业参与实体产业的价值创造活动,帮助实体产业提高价值创造效率,并分享利润,但如果分享的份额过高,则会影响产业资本积累,阻碍经济发展。2007年至2018年的省级面板数据表明,中国金融业的利润占比与经济增长速度呈显著负相关,金融业分享的利润过高,已经达到了损害经济增长的程度。健全金融行业内部的竞争机制、引导金融机构关注产业发展、重视长远利益,是增强金融服务实体经济能力的有效手段。

关键词：金融业利润经济发展过度金融化

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一般均衡理论视角下绿色金融的减排效应研究:从模型构建到实证检验

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中国管理科学 2022年第12期30卷 173-184页

作者：文书洋史皓铭郭健西南财经大学中国金融研究中心四川成都610031 西南财经大学金融学院四川成都610031 中央财经大学管理科学与工程学院北京100089 中国石油大学(北京)克拉玛依校区工商管理学院新疆维吾尔自治区克拉玛依834000

绿色金融是否能够有效促进碳减排?其内在机制是什么?在碳达峰与碳中和的时代目标下,科学、严谨地回答这一问题意义重大。本文将经典理论与最新前沿相结合,提出绿色金融能够通过促进绿色技术进步帮助碳减排的理论假说。构建带有碳排放约... 详细信息

绿色金融是否能够有效促进碳减排?其内在机制是什么?在碳达峰与碳中和的时代目标下,科学、严谨地回答这一问题意义重大。本文将经典理论与最新前沿相结合,提出绿色金融能够通过促进绿色技术进步帮助碳减排的理论假说。构建带有碳排放约束并内生减排技术进步的一般均衡模型,解释了绿色金融通过支持技术进步实现碳减排的内在机制,并提供了基于中国省级面板数据的实证证据。本文的研究从理论和实证两个维度论证了绿色金融对碳减排的影响,指出支持技术创新是绿色金融发挥减排效应的重要机制。因而在发展绿色金融的过程中,注重金融资源的实际用途,有效支持减排技术更新,比单纯限制高排放行业的金融资源获取更加有效。同时,理论分析表明,绿色金融并非越多越好,而是存在最优规模。在积极推动绿色金融发展的同时,依然需要注重统筹规划,避免金融“过绿”带来不必要的损失。

关键词：绿色金融碳排放一般均衡模型

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