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Emerging probing perspective of two-dimensional materials physics:terahertz emission spectroscopy

Light(Science & Applications) 2024年第7期13卷 1278-1298页

作者： Yifei Wu Yuqi wang Di Bao Xiaonan Deng Simian Zhang Lin Yu-chun Shengxian Ke Jianing Liu Yingjie Liu zeli wang Pingren Ham Andrew Hanna Jiaming Pan Xinyue Hu Zhengcao Li Ji Zhou Chen wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua University100084 BeijingChina Beijing Advanced Innovation Center for Integrated Circuits 100084 BeijingChina

Terahertz(THz)emission spectroscopy(TES)has emerged as a highly effective and versatile technique for investigating the photoelectric properties of diverse materials and nonlinear physical processes in the past few ***,research on two-dimensional(2D)materials has experienced substantial growth due to their atomically thin structures,exceptional mechanical and optoelectronic properties,and the potential for applications in flexible electronics,sensing,and ***,these materials offer advantages such as tunable bandgap,high carrier mobility,wideband optical absorption,and relatively short carrier *** applying TES to investigate the 2D materials,their interfaces and heterostructures,rich information about the interplay among photons,charges,phonons and spins can be unfolded,which provides fundamental understanding for future *** it is timely to review the nonlinear processes underlying THz emission in 2D materials including optical rectification,photon-drag,high-order harmonic generation and spin-to-charge conversion,showcasing the rich diversity of the TES employed to unravel the complex nature of these *** applications based on THz emissions,such as THz lasers,ultrafast imaging and biosensors,are also *** further,we analyzed the unique advantages of spintronic terahertz emitters and the future technological advancements in the development of new THz generation mechanisms leading to advanced THz sources characterized by wide bandwidth,high power and integration,suitable for industrial and commercial *** continuous advancement and integration of TES with the study of 2D materials and heterostructures promise to revolutionize research in different areas,including basic materials physics,novel optoelectronic devices,and chips for post-Moore’s era.

关键词： optoelectronic versatile exceptional

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有机肥对渭北旱塬烟区烤烟产质量的影响

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中国农学通报 2024年第8期40卷 38-46页

作者：张世杰杨波王宾刚刘云张喜峰王文丽王泽理李山陕西省烟草公司宝鸡市公司陕西宝鸡721004 甘肃省农业科学院土壤肥料与节水农业研究所兰州730070 甘肃烟草工业有限责任公司兰州730050

研究有机肥对烤烟产量和品质的影响,可为陕西渭北旱塬烤烟产区有机肥替代部分化肥应用提供理论依据。通过田间试验、室内化学分析及感官评价相结合的方法,研究有机肥部分替代化肥对烤烟生长发育、产量、化学成分、感官评吸质量及经济效... 详细信息

研究有机肥对烤烟产量和品质的影响,可为陕西渭北旱塬烤烟产区有机肥替代部分化肥应用提供理论依据。通过田间试验、室内化学分析及感官评价相结合的方法,研究有机肥部分替代化肥对烤烟生长发育、产量、化学成分、感官评吸质量及经济效益的影响。结果表明:有机肥替代20%~40%的化肥有利于烤烟提早成熟,在烤烟成熟期,可使烤烟倒四叶叶片的SPAD值降低5.63%~6.83%,有机肥替代20%~40%的化肥处理与常规施肥相比,中上等烟叶的占比率提升19.94%~29.76%,总产值和净产值分别提升4.70%~6.96%和8.12%~20.26%,其评吸综合分值显著高于常规施肥和有机肥替代10%的化肥处理。利用主成分分析对代表烤烟产质量的11项指标进行综合评价,有机肥替代30%的化肥处理综合得分最高,其次是有机肥替代20%的化肥处理,再次是有机肥替代40%的化肥处理。在陕西渭北旱塬烟区,有机肥替代20%~40%的化肥有利于烟叶化学成分内在的协调性,能显著促进烟叶成熟,增加烤烟中上等烟叶的占比率,提高烤烟的经济效益。

关键词：有机肥烤烟产量品质主成分分析

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Parallel computing strategy for the simulation of particulate flows with immersed boundary method

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Science China(Technological Sciences) 2008年第8期51卷 1169-1176页

作者： wang zeli FAN JianRen LUO Kun State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China

A parallel computing strategy for the simulation of particulate flows with immersed boundary technique is proposed. This strategy can deal with the coupling between fluid and particle easily when particle crosses the boundaries of sub-domains which are decomposed from original computational domain. And a two- dimen- sional circular particle settling in a closed rectangular domain is simulated with the parallel technique and immersed boundary method to validate the parallel effi- ciency.

关键词： parallel computing immersed boundary method particulate flows

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Record of Early-Stage Rodingitization from the Purang Ophiolite Complex,Western Tibet

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Journal of Earth Science 2019年第6期30卷 1108-1124页

作者： Songjie wang Xu-Ping Li Wenyong Duan Fanmei Kong zeli wang Shandong Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and Technology

Rodingitization,commonly coupled with serpentinization of ultramafic rocks,bears significant information for fluid-rock interactions and element transfer from sea-floor to subduction zone *** outcrops of rodingites are exposed along the Yarlung Zangbo suture zone(YZSZ)of southern Tibet,providing us an excellent opportunity to probe the petrogenetic processes,and unravel their implications for regional tectonic *** studies have been performed on rodingites from the eastern to central portions of the YZSZ,whereas limited work has ever been conducted on rodingitized rocks from the western segment of the YZSZ,precluding a comprehensive understanding of this lithological *** this paper,we present detailed studies of petrology,mineral,whole-rock geochemistry and phase equilibrium modeling on a suite of newly recognized rodingites within the Purang ophiolite massif in the southwestern part of the *** rodingites have a major metasomatic mineral association of chlorite,clinozoisite,amphibole and minor amounts of plagioclase,representing products of an early-stage *** generally present compositions of low SiO2(48.89 wt.%–53.57 wt.%),Fe2O3^T(3.77 wt.%–5.56 wt.%),Na2O(1.31 wt.%–1.93 wt.%),Al2O3(4.78 wt.%–8.84 wt.%),moderate CaO(9.69 wt.%–11.23 wt.%),and high MgO(24.11 wt.%–26.08 wt.%)concentrations with extremely high Mg^# values[Mg^#=100×Mg/(Mg+Fe^2+)molar]of 89–***-rock recalculation reveals that the rodingites have a protolith of mantle-derived olivine gabbro or *** have low rare earth element compositions(∑REE=2.4 ppm–6.5 ppm)and are characterized by flat LREE and slightly enriched HREE patterns with positive Eu anomalies;they also exhibit positive anomalies in Sr,U and Pb and negative anomalies in high-field strength elements,including Nb,P and Ti,suggesting for a subduction-zone *** equilibrium modeling shows that the rodingitization did take place at P<2 kbar and T=~350–400℃,consiste

关键词： Purang ophiolite complex early-stage rodingitization geochemistry phase equilibrium modeling western Tibet

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Ethereum smart contract security research:survey and future research opportunities

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Frontiers of Computer Science 2021年第2期15卷 143-160页

作者： zeli wang Hai JIN Weiqi DAI Kim-Kwang Raymond CHOO Deqing ZOU National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabClusters and Grid Computing LabHubei Engineering Research Center on Big Data SecurityWuhan430074China School of Computer Science and Technology Huazhong University of Science and TechnologyWuhan430074China School of Cyber Science and Engineering Huazhong University of Science and TechnologyWuhan430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen518057China Department of Information Systems and Cyber Security University of Texas at San AntonioSan AntonioTX78249-0631USA

Blockchain has recently emerged as a research trend,with potential applications in a broad range of industries and *** particular successful Blockchain technology is smart contract,which is widely used in commercial settings(e.g.,high value financial transactions).This,however,has security implications due to the potential to financially benefit from a security incident(e.g.,identification and exploitation of a vulnerability in the smart contract or its implementation).Among,Ethereum is the most active and ***,in this paper,we systematically review existing research efforts on Ethereum smart contract security,published between 2015 and ***,we focus on how smart contracts can be maliciously exploited and targeted,such as security issues of contract program model,vulnerabilities in the program and safety consideration introduced by program execution *** also identify potential research opportunities and future research agenda.

关键词： smart contract security blockchain vulnerability unreliable data

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Metamorphic Petrology of Clinopyroxene Amphibolite from the Xigaze Ophiolite,Southern Tibet: P-T Constraints and Phase Equilibrium Modeling

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Journal of Earth Science 2019年第3期30卷 549-562页

作者： Yancheng Zhang Xu-Ping Li Guangming Sun zeli wang Wenyong Duan Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals College of Earth Science & EngineeringShandong University of Science and Technology

The clinopyroxene amphibolite from the Bailang terrane is located in the central section of the Yarlung Zangbo suture zone(YZSZ),southern *** study of it is expected to provide important clues for the subduction of the Neo-Tethyan Ocean below the Asian Plate and thus for better understanding of the development of the India-Asia collision *** on integrated textural,mineral compositional,metamorphic reaction history and geothermobarometric studies of the clinopyroxene amphibolite within a serpentinite mélange,four overprinted metamorphic stages are *** are the first metamorphic record of M1 stage indicated by a relict assemblage of plagioclase+clinopyroxene+amphibole,an early M2 stage characterized by an assemblage of medium-grained clinopyroxene+amphibole+plagioclase+quartz as well as rutile inclusion in titanite,which is formed during burial process,an isobaric cooling M3 stage which is characterized by an assemblage of clinopyroxene+amphibole+plagioclase+titanite,and a decomposing retrograde stage M4,which is represented by the amphibolite+plagioclase symplectite+titanite+rutile+*** applying the THERMOCALC(versions 6.2 and 6.3)technique in the NCFMASHTO system,the P-T conditions estimated from M1 to M4 stages are ca.8.6 kbar/880℃,10.8–13.4 kbar/800–840℃,12.7–13.2 kbar/650–660℃ and<11.2 kbar/640℃,*** mineral assemblages and their P-T conditions define a counterclockwise P-T path for the clinopyroxene amphibolite of the Xigaze ophiolite,suggesting that the rocks underwent a cooling process during burial from magmatic protolith,and a decompressing stage after the pressure peak metamorphic conditions,which implies that the Bailang terrane of the Xigaze ophiolite may have experienced subduction/collision-related tectonic *** peak metamorphism reaches to the transitional P-T conditions among amphibolite facies,granulite facies and eclogite facies with a burial depth of 30–40 *** exhumation of the ophiolitic unit

关键词： clinopyroxene amphibolite thermodynamic modeling P-T conditions counterclock P-T path Bailang terrane Xigaze ophiolite Tibet

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Redefinition and Formation Age of the Tanjianshan Group in Xitieshan Region, Qinghai

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Acta Geologica Sinica(English Edition) 2014年第2期88卷 394-409页

作者： LIANG Xinquan FU Jiangang wang Ce JIANG Ying ZHOU Yun YANG Yongqiang wang zeli PAN Chuanchu State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences University of Chinese Academy of Sciences China University of Geosciences Shandong University of Science and Technology Changsha Deposit Survey Centre Guangzhou Institute of GeochemistryChinese Academy of Sciences

The Tanjianshan Group,which was previously divided into a,b,c and d formations,has been controversial for a long *** mainly distributes in the northern margin of Qaidam Basin and is an important early Paleozoic greenschist facies metamorphic volcanic sedimentary rock *** field investigation and zircon LA-ICPMS U-Pb dating of the key strata suggest that the original lower part of a Formation （a-1） versus the original middle upper of d Formation （d-3 and d-4）,the original upper part of a Formation （a-2） and b Formation versus the original lower part of d Formation （d-1 and d-2） of Tanjianshan Group are contemporaneous heterotopic facies volcanicclasolite deposit,*** former formations formed during the middle-late Ordovician （463-458 Ma）,while the latter ones formed in the late Ordovician （about 445 Ma）.The original c formation of Tanjianshan Group,which formed after 430 Ma,is similar to the Maoniushan Formation of Kunlun Mountains and north Qaidam *** to the rules of stratigraphic division and naming,new stratum formations of Tanjianshan Group are re-built and divided into Duancenggou （O1-2td）,Zhongjiangou （O2-3tz） and Xitieshan （O3tx） *** original c Formation is separated from Tanjianshan Group and is renamed as the Wuminggou Formation （S3-D1W）,which shows a discordant contact with underlying Tanjianshan Group and overlying Amunike Formation （D3a）.The zircon U-Pb age frequency spectrogram of Tanjianshan Group indicates three prominent peaks of 430 Ma,460 Ma and 908 Ma,which is consistent with the metamorphic and magmatic crystallization ages obtained from para-and orthogneisses in north Qaidam HP-UHP metamorphic belt,implying that strong Caledonian and Jinningian tectonic and magmatic events have ever happened in North Qaidam.

关键词： LA-ICPMS zircon U-Pb age Tanjianshan Group stratigraphic sequence Xitieshan

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Metamorphic Characteristics and Tectonic Implications of the Kadui Blueschist in the Central Yarlung Zangbo Suture Zone,Southern Tibet

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Journal of Earth Science 2018年第5期29卷 1026-1039页

作者： Guangming Sun Xu-Ping Li WenYong Duan Shuang Chen zeli wang Lingquan Zhao Qingda Feng Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266590China Institut fur Geologie Mineralogie und GeophysikRuhr-UniversitatBochum 44780Germany Center of Hydrogeology and Environmental Geology Survey China Geological SurveyBaoding 071051China

The Kadui blueschist is located in the central section of Yarlung Zangbo suture zone （YZSZ）, southern Tibet, and has been subjected to the subduction of the Neo-Tethyan Ocean below the Asian Plate and provides important clues for better understanding the evolution of the India-Asia convergence zone. In this paper, the systematical petrographic and mineral chemical studies were carried out on the Kadui blueschist, which reveal a mineral assemblage of sodic amphibole, chlorite, epidote, albite and quartz with accessory minerals of titanite, calcite and zircon. Electron microprobe analyses demonstrate that amphibole shows zoned from actinolite core to ferrowinchite/riebeckite rim composition indicating that the sodic amphibole has formed during a prograde metamorphic event. The protolith of the blueschist is an intermediate-basic pyroclastic rock. The calculated pseudosection indicates a clockwise P-T path and constrains peak metamorphic conditions of about 5.9 kbar at 345 ℃. This condition is transitional between pumpellyite-actinolite, greenschist and blueschist facies with a burial depth of 20-22 km and a thermal gradient of 15-16 ℃/km. This thermal gradient belongs to high pressure intermediate P/T facies series and is possibly related to a warm subduction setting of young oceanic slabs. Our new findings indicate that the Kadui blueschist in the central part of YZSZ experienced a rapid subduction and exhumation process as a response to a northward subduction of the Neo-Tethyan oceanic lithosphere during the initial India-Asia collision stage.

关键词： Kadui blueschist metamorphism P-T conditions accretionary complex southern Tibet.

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尖角磁场极性对双钨极氩弧焊电弧形态和焊缝特征的影响

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焊接学报 2023年第3期44卷 37-43,I0005页

作者：刘润涛朱言利王泽力刘黎明大连理工大学辽宁省先进连接技术重点实验室大连116024

针对双钨极氩弧焊(T-TIG)存在的电弧压力小、焊缝熔深浅等问题,引入不同极性的外加尖角磁场辅助T-TIG焊方法.分别采用高速摄像机和红外摄像仪研究不同极性的尖角磁场对电弧形态和焊缝特征的影响规律,并构建物理模型以揭示尖角磁场与电... 详细信息

针对双钨极氩弧焊(T-TIG)存在的电弧压力小、焊缝熔深浅等问题,引入不同极性的外加尖角磁场辅助T-TIG焊方法.分别采用高速摄像机和红外摄像仪研究不同极性的尖角磁场对电弧形态和焊缝特征的影响规律,并构建物理模型以揭示尖角磁场与电弧等离子体间的相互作用机制.结果表明,外加尖角磁场影响着T-TIG电弧形态和焊缝温度场,两种极性的尖角磁场都对其热影响区组织有细化作用.其中,在正极性的尖角磁场作用下,T-TIG电弧形态变化程度更大,焊缝温度场更加集中,焊缝熔深比未加磁场时增加37.1%,同时能量利用效率提高31.6%.

关键词： T-TIG焊尖角磁场不同极性电弧形态焊缝特征

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不同极性下的三丝间接电弧中厚板焊接研究

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机械工程学报 2022年第22期58卷 219-226页

作者：徐国敏刁国宁王泽力刘黎明大连理工大学材料科学与工程学院大连116024

三丝间接电弧焊是一种新型电弧焊技术,电弧放电通道形成于三个电极之间,电极极性的连接方式会对焊接过程产生重要影响。为揭示不同极性连接方式的三丝气体间接电弧中厚板焊接过程工艺特点,采用主丝接正和主丝接负的连接方式分别对8 mm Q... 详细信息

三丝间接电弧焊是一种新型电弧焊技术,电弧放电通道形成于三个电极之间,电极极性的连接方式会对焊接过程产生重要影响。为揭示不同极性连接方式的三丝气体间接电弧中厚板焊接过程工艺特点,采用主丝接正和主丝接负的连接方式分别对8 mm Q345低碳钢板进行了对接焊试验。结果表明,在两种极性连接方式的三丝间接电弧中厚板焊接过程中,由于电弧形态以及熔滴过渡路径的差异,主丝接正时的稳定性不受电弧所处阶段的影响;而主丝接负时,熔滴在焊接阶段容易发生短路爆炸造成焊接稳定性下降,这是焊缝表面气孔以及接头局部未熔合缺陷产生的主要原因;随着焊接电流的增大,两种极性下的电弧弧柱区宽度均增大,且主丝接正时的弧柱区的电子温度均大于主丝接负时的。

关键词：中厚板间接电弧电子温度焊接稳定性

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