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Exploring the regulatory effect of stacked layers on moiréexcitons in twisted WSe_(2)/WSe_(2)/WSe_(2)homotrilayer

Nano Research 2023年第7期16卷 10573-10579页

作者： Haihong Zheng Biao Wu Chang-Tian Wang shaofei Li Jun He Zongwen Liu jian-Tao Wang ji-an Duan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518057China

Moirésuperlattices in van der Waals structures have emerged as a powerful platform for studying the novel quantum properties of two-dimensional *** periodic moirépatterns generated by these structures lead to the formation of flat mini-bands,which alter the electronic energy bands of the *** resulting flat electronic bands can greatly enhance strong correlative interactions between electrons,leading to the emergence of exotic quantum phenomena,including moiréphonons and moiré*** extensive research has been conducted on the exotic quantum phenomena in twisted bilayers of transition metal dichalcogenides(TMDs),and the regulatory effect of stacked layers on moiréexcitons remains *** this study,we report the fabrication of a twisted WSe_(2)/WSe_(2)/WSe_(2) homotrilayer with two twist angles and investigate the influence of stacked layers on moiré*** experiments reveal multiple moiréexciton splitting peaks in the twisted trilayer,with moirépotential depths of 78 and 112 meV in the bilayer and trilayer homostructures,*** also observed the splitting of the moiréexcitons at 90 K,indicating the presence of a deeper moirépotential in the twisted ***,we demonstrate that stacked layers can tune the moiréexcitons by manipulating temperature,laser power,and magnetic *** results provide a new physical model for studying moirésuperlattices and their quantum properties,which could potentially pave the way for the development of quantum optoelectronics.

关键词： materials material field

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Constraints of palaeoenvironment on organic matter of Benxi Formation shale and discussion on enrichment mechanism under different facies

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Frontiers of Earth Science 2024年第1期18卷 148-171页

作者： Qianyang HE Delu LI Qiang SUN jianwen GAO Haibin LI Xinhu LI Xiaochen ZHAO shaofei WANG Gaozhe ji College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation Xi’an University of Science and TechnologyXi’an 710054China Geological Research Institute for Coal Green Mining Xi’an University of Science and TechnologyXi’an 710054China Research Institute of Exploration and Development PetroChina Changqing Oilfield CompanyXi’an 710018China School of Civil Engineering and Architecture Shaanxi University of TechnologyHanzhong 723001China

As a hydrocarbon-rich sedimentary basin in China,the Ordos Basin has enormous potential for shale gas *** shale of the Upper Carboniferous Benxi Formation is rich in organic matter,however,its palaeoenvironment and organic matter enrichment mode are yet to be *** this study,the geochemical characteristics of the shale of the Benxi Formation in the east-central part of the Ordos Basin were analyzed to investigate its *** the same time,the organic matter enrichment modes in different sedimentary facies were compared and *** results indicate that:1)the shale of the Benxi Formation was mainly deposited on the continental margin and strong terrestrial clastic input;2)the deposition period of the Benxi Formation shale had a hot and humid climate with high palaeoproductivity and local volcanic hydrothermal fluid,and a high sedimentation rate with the strong stagnant *** bottom water was in dysoxic conditions and a semi-saline deposition environment;3)multiple factors,such as palaeoproductivity,volcanic hydrothermal,redox conditions,and palaeosalinity interact to influence the enrichment of shale organic matter in Benxi Formation;4)the organic matter enrichment modes of continental,marine-continental transitional,and marine shales can be classified into three types:“production mode”,“hybrid mode of preservation and production”,and“preservation mode”,*** study provides a reference for the organic matter enrichment mode,shale gas formation conditions,and core area evaluation in these marine-continental transitional shales,and also offers new guidance for exploration ideas for shale gas in different sedimentary facies.

关键词： Benxi Formation shale palaeoenvironment organic matter enrichment facies

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Enhanced valley polarization in WSe_(2)/YIG heterostructures via interfacial magnetic exchange effect

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Nano Research 2023年第7期16卷 10580-10586页

作者： Haihong Zheng Biao Wu Chang-Tian Wang shaofei Li Jun He Zongwen Liu jian-Tao Wang Guoqiang Yu ji-An Duan Yanping Liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518057China

Exploiting the valley degrees of freedom as information carriers provides new opportunities for the development of *** transition metal dichalcogenides(TMDs)with broken space-inversion symmetry exhibit emerging valley pseudospins,making them ideal platforms for studying valley ***,intervalley scattering of different energy valleys limits the achievable degree of valley ***,we constructed WSe_(2)/yttrium iron garnet(YIG)heterostructures and demonstrated that the interfacial magnetic exchange effect on the YIG magnetic substrate can enhance valley polarization by up to 63%,significantly higher than that of a monolayer WSe_(2)on SiO_(2)/Si(11%).Additionally,multiple sharp exciton peaks appear in the WSe_(2)/YIG heterostructures due to the strong magnetic proximity effect at the magnetic-substrate interface that enhances exciton emission ***,under the effect of external magnetic field,the magnetic direction of the magnetic substrate enhances valley polarization,further demonstrating that the magnetic proximity effect regulates valley *** results provide a new way to regulate valley polarization and demonstrate the promising application of magnetic heterojunctions in magneto-optoelectronics.

关键词： magnetic exchange effect valley polarization two-dimensional valleytronics magnetic substrate

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Boron nitride microribbons strengthened and toughened alumina composite ceramics with excellent mechanical,dielectric,and thermal conductivity properties

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Journal of Advanced Ceramics 2024年第4期13卷 496-506页

作者： jilin Wang Dongping Lu Weiping Xuan Yuchun ji Ruiqi Chen shaofei Li Wenbiao Li Wenzhuo Chen Shilin Tang Guoyuan Zheng Fei Long Guangxi Key Laboratory of Optical and Electronic Materials and Devices Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of ResourcesSchool of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education Guilin University of TechnologyGuilin 541004China School of Materials Science and Engineering Peking UniversityBeijing 100871China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina

Aluminum oxide(Al_(2)O_(3))ceramics have been widely utilized as circuit substrates owing to their exceptional *** this study,boron nitride microribbon(BNMR)/Al_(2)O_(3)composite ceramics are prepared using spark plasma sintering(SPS).This study examines the effect of varying the amount of toughened phase BNMR on the density,mechanical properties,dielectric constant,and thermal conductivity of BNMR/Al_(2)O_(3)composite ceramics while also exploring the mechanisms behind the toughening and increased thermal conductivity of the fabricated *** results showed that for a BNMR content of 5 wt%,BNMR/Al_(2)O_(3)composite ceramics displayed more enhanced characteristics than pure Al_(2)O_(3)*** particular,the relative density,hardness,fracture toughness,and bending strength were 99.95%±0.025%,34.11±1.5 GPa,5.42±0.21 MPa·m^(1/2),and 375±2.5 MPa,*** values represent increases of 0.76%,70%,35%,and 25%,respectively,compared with the corresponding values for pure Al_(2)O_(3)***,during the SPS process,BNMRs are subjected to high temperatures and pressures,resulting in the bending and deformation of the Al_(2)O_(3)matrix;this leads to the formation of special thermal pathways within *** dielectric constant of the composite ceramics decreased by 25.6%,whereas the thermal conductivity increased by 45.6%compared with that of the pure Al_(2)O_(3)*** results of this study provide valuable insights into ways of enhancing the performance of Al_(2)O_(3)-based ceramic substrates by incorporating novel BNMRs as a second *** improvements are significant for potential applications in circuit substrates and related fields that require high-performance materials with improved mechanical properties and thermal conductivities.

关键词： boron nitride microribbons/aluminum oxide(BNMRs/Al_(2)O_(3))composite ceramics boron nitride microribbon(BNMR) spark plasma sintering(SPS) strengthening and toughening thermal conductivity

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Simultaneously improving mechanical properties and oxidation resistance of Ti-bearing high-entropy superalloys at intermediate temperature via silicon addition

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Journal of Materials Science & Technology 2023年第26期157卷 30-41页

作者： shaofei Liu Weicheng Xiao Bo Xiao jiang Ju Yinghao Zhou Yilu Zhao Zengbao jiao Junhua Luan Qian Li jinxiong Hou ji-jung Kai Tao Yang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China Hong Kong Institute for Advanced Study City University of Hong KongHong Kong 999077China

Ti-bearing high-entropy superalloys(HESAs)often suffer from severe intergranular embrittlement and terrible oxidation degradation at intermediate *** we showcase that minor Si addition can effectively mitigate the intergranular embrittlement and improve the oxidation resistance of the a(Ni_(2)Co_(2)FeCr)_(92) Ti_(4)Al_(4) HESA at 700℃ *** analysis revealed that the intergranu-lar G phase induced by 2 at%Si addition can effectively suppress the inward diffusion of oxygen along grain boundaries at 700℃,thus enhancing the tensile ductility of the alloy from∼8.3%to∼13.4%.Be-sides,the 2 at%Si addition facilitated the formation of a continuous Al_(2)O_(3) layer during oxidation,con-tributing to a remarkable reduction in the growth rate of the oxide scale to a quarter of the Si-free *** results demonstrate that Si can be a favorable alloying element to design advanced HESAs with syn-ergistically improved thermal-mechanical performance.

关键词： High-entropy superalloy Mechanical property Oxidation behavior Intermediate temperature Silicon addition

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十一届全国气溶胶会议暨第十届海峡两岸气溶胶技术研讨会

作者： shaofei Kong Yaqin ji Bing Lu Xueyan Zhao Zhipeng Bai Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science and Technology College of Environmental Science and Engineering Nankai University Chinese Research Academy of Environmental Sciences

PM2.5, PM10 and TSP source profiles for road dust, soil dust and re-suspended dust were established by adopting a re-suspension chamber in a coastal oilfield city-Dongying in 11/2009-4/2010. Thirty-nine elements, nine ions, organic and elemental carbon were analyzed by multiple methods. Results indicated that Ca, Si, OC, Ca2+, Al, Fe and SO42- were the most abundant species for all the three types of dust within the three fractions. OC/TC ratios were highest for dusts in Dongying when compared with literatures which may be related to the large amounts of oil exploited and consumed. Na, Mg and Na+ in soil and road dust from Dongying also exhibited higher mass percentages than others indicating the influence of sea salt as the city was more adjacent to coastal line. Enrichment factors analysis showed that Cd, Ca, Cu, Zn, Ba, Ni, Pb, Cr, Mg and As were enriched and these elements were tended to concentrate in finer fraction. Similarities of the profiles for different size fractions and different types of dust were compared by coefficient of divergence（CD）. The profiles for different types of dust were different to each other with the CD values mostly higher than 0.30;while the profiles for different size fractions of each dust were similar to each other with the CD values mostly lower or near to 0.30.

关键词： Source profile fugitive dust size-differentiated particle oilfield city

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高超声速1MHz高频脉动压力测试技术及其应用

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空气动力学学报 2016年第5期34卷 587-591页

作者：纪锋解少飞沈清中国航天空气动力技术研究院北京100074

为了研究高超声速边界层内的高频脉动结构,特别是第二模态不稳定波,在FD-07风洞中搭建了一套1MHz量级高频脉动压力采集系统。风洞背景噪声和电磁噪声是影响高频脉动结构测量的主要原因。在风洞流场品质无法改变的前提下,对高频脉动压力... 详细信息

为了研究高超声速边界层内的高频脉动结构,特别是第二模态不稳定波,在FD-07风洞中搭建了一套1MHz量级高频脉动压力采集系统。风洞背景噪声和电磁噪声是影响高频脉动结构测量的主要原因。在风洞流场品质无法改变的前提下,对高频脉动压力采集系统的信号传输进行了改进,包括工频电源隔离、传输电缆屏蔽和采集设备接地等。通过改进措施,采集系统的抗电磁干扰和信号衰减的能力得到改善,其信噪比得以显著提升。结果表明,改进前后各频段噪声的能谱密度大幅降低(在频率400kHz以下,噪声能谱密度降低了一个量级以上)。最后,利用该测试技术成功地在FD-07高超声速风洞中进行了边界层稳定性实验,捕捉到了第二模态不稳定波,其主导频率范围与线性稳定性理论预测结果吻合。

关键词：高超声速高频脉动结构电磁噪声信号衰减第二模态不稳定波

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功能性润滑脂的开发进展

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化工学报 2015年第8期66卷 2878-2887页

作者：曾晖李少飞刘涛周嘉明莫嘉文纪红兵中山大学化学与化学工程学院广州510275 中山大学惠州研究院惠州516081 广东工业大学轻工化工学院广州510006

先进的润滑材料技术是延长工业装备寿命、减少能耗极为重要的一个因素。润滑脂作为一种高效、长寿命润滑材料被越来越多应用到工业装备上,已经得到广泛重视。本文简述了功能性半固态润滑材料——润滑脂国内外研究的进展,包括产品性能、... 详细信息

先进的润滑材料技术是延长工业装备寿命、减少能耗极为重要的一个因素。润滑脂作为一种高效、长寿命润滑材料被越来越多应用到工业装备上,已经得到广泛重视。本文简述了功能性半固态润滑材料——润滑脂国内外研究的进展,包括产品性能、结构-性能、生产过程优化、合成理论、工艺设备等方面研究的发展和现状,对润滑脂的发展做出了展望。

关键词：润滑脂摩擦吸附表面流变学

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酒糟在流化床中燃烧特性的试验研究

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动力工程学报 2013年第6期33卷 479-483页

作者：别如山黄兵宋兴飞纪晓瑜朱少飞哈尔滨工业大学能源科学与工程学院哈尔滨150001

利用X射线荧光光谱仪、灰熔点仪和热重分析仪等对酒糟的灰成分、灰熔点及着火温度进行了测试,并在小型流化床试验台上进行了酒糟燃烧试验,对不同含水率酒糟的着火特性、烧结特性和NOx排放质量浓度进行了研究.结果表明:酒糟灰中K2O和Na2... 详细信息

利用X射线荧光光谱仪、灰熔点仪和热重分析仪等对酒糟的灰成分、灰熔点及着火温度进行了测试,并在小型流化床试验台上进行了酒糟燃烧试验,对不同含水率酒糟的着火特性、烧结特性和NOx排放质量浓度进行了研究.结果表明:酒糟灰中K2O和Na2O的含量很低,只有4.936%;酒糟灰的软化温度较高,高于1 290℃;干燥酒糟的挥发分较高,高于250℃就能够着火燃烧;当石英砂的平均粒径为300μm、流化床内的流化速度大于0.36m/s时,流化状况良好;在900℃下,酒糟在石英砂流化床中燃烧不会出现烧结现象;在不同的燃烧温度下,NOx排放质量浓度均较大,且随着燃烧温度的升高而增大;酒糟可以在石英砂流化床中燃烧,且燃尽效果良好.

关键词：酒糟流化床烧结特性灰熔点流化速度 NOx 排放质量浓度

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高密度金属间化合物纳米颗粒强化型单晶高熵超合金的高温氧化行为

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Science China Materials 2023年第11期66卷 4239-4250页

作者：肖维城鞠江刘少飞肖博周英豪开执中赵怡潞杨涛 Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Hong Kong Branch of National Precious Metals Material Engineering Research Centre(NPMM) City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong Kong 999077China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China City University of Hong Kong Shenzhen Research Institute Shenzhen 518057China

本文系统研究了单晶L_(12)强化富Co高熵超合金Co_(41)Ni_(35)Al_(11.5)-Ta_(2.5)Cr_(4)Ti_(6)(at%)在空气中800,900和1000℃下的氧化行为.结果表明,该合金在800至1000℃范围内均表现出优异的抗氧化性.其中,在800℃氧化后,合金表面形成... 详细信息

本文系统研究了单晶L_(12)强化富Co高熵超合金Co_(41)Ni_(35)Al_(11.5)-Ta_(2.5)Cr_(4)Ti_(6)(at%)在空气中800,900和1000℃下的氧化行为.结果表明,该合金在800至1000℃范围内均表现出优异的抗氧化性.其中,在800℃氧化后,合金表面形成了双层氧化膜,由TiO_(2)/Al_(2)O_(3)混合层和Cr_(2)O_(3)层组成.连续但不致密的Cr_(2)O_(3)层不能有效抑制内部氧化和内部氮化.在900和1000℃时形成复杂的分级结构氧化膜,主要成分为尖晶石、Cr_(2)O_(3)、TiTaO_(4)和Al_(2)O_(3).值得注意的是,在900至1000℃的温度范围内发现抗氧化性出现了反常提高.具体来说,在1000℃下形成的更复杂和连续的五层氧化层,特别是底部的连续致密的Al_(2)O_(3)层,赋予合金在1000℃下优异的抗氧化性.

关键词： high-entropy superalloy high-temperature oxidation FIB-TEM oxide scale oxidation diffusion

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