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Chinese Chemical Letters 2024年第7期35卷 100-106页

作者： Qiang Fu Shouhong Sun Kangzhi Lu Ning Li Zhanhua dong College of Engineering Qufu Normal UniversityRizhao 276826China

Due to their superior fluorescence,phosphorescence,and catalytic capabilities,carbon dots(CDs),an emerging class of fluorescent carbon nanomaterials,have a wide range of potential *** properties of CDs have recently been controlled extensively by heteroatom *** atoms have been effectively doped into the structure of CDs due to their similar size to carbon atoms and excellent electron-absorbing ability to further improve the performance of *** this review,we summarize the research progress of boron-doped CDs in recent years from the aspects of doping strategies,effects of boron doping on different performances of CDs and *** from the two aspects of single boron doping and boron and other atom co-doping,from different precursor materials to different synthesis methods,the doping strategies of boron-doped CDs are reviewed in ***,the effects of boron doping on the fluorescence,phosphorescence and catalytic performance of CDs and applications of boron-doped CDs in optical sensors,information encryption and anti-counterfeiting are ***,we further provide a prospect towards the future development of boron-doped CDs.

关键词： Carbon dots Boron-doped Luminescent material Doping strategies Performance effects

Influence of contact layer on the sulphur corrosion of copper conductors in power transformers

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High Voltage 2022年第1期7卷 176-184页

作者： Lijun Yang dong Ding Yuan Yuan Sihang Gao Yuncai Lu State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqingChina College of Material Science and Engineering Chongqing UniversityChongqingChina Key Laboratory of Industrial Internet of Things and Networked Control Ministry of EducationChongqing University of Posts and TelecommunicationsChongqingChina State Grid Jiangsu Electric Power Co. Ltd.Electric Power Research InstituteNanjingChina

Owing to the corrosive sulphides in the mineral insulating oil such as dibenzyl disul-phide(DBDS),copper windings in oil‐immersed transformers may suffer sulphur *** study investigates the influence of different contact conditions on the corrosion of copper conductors in ***‐immersed accelerated corrosion experiment was conducted on copper conductors with various contact materials and different layers of insulating *** surface micromorphology,deposition compo-nent and the potentiodynamic polarization characteristics of copper conductors were *** results show that copper with different contact materials suffer sulphur corrosion;conversely,bare copper rarely *** was also verified that the existence of a particular gap between copper and contact layer is a significant factor in sulphur corrosion by the formation of a concentration cell on the copper *** insu-lating paper wrapped around copper conductors does not increase the corrosion ten-dency of copper;however,it contributes to the formation of a region concentrated with DBDS,Cu^(2+),H^(+)by adsorption and impediment,which plays a key role in facilitating the sulphur corrosion of copper ***,sulphur corrosion can also occur on other metal parts in transformers when there is a particular gap on surfaces other than copper.

关键词： corrosion copper sulphur

Theoretical and Experimental Study of A Coaxial Double-Buoy Wave Energy Converter

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China Ocean Engineering 2021年第3期35卷 454-464页

作者： LI De-min dong Xiao-chen SHI Hong-da LI Yan-ni Department of Ocean Engineering College of EngineeringOcean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Ocean University of ChinaQingdao 266100China Pilot National Laboratory for Marine Science and Technology(QingDao) Qingdao 266200China

The double-body heave wave energy converter(WEC)is one of the most conducive devices to absorb the wave energy from relative motion while the law of which is not well *** paper makes an in-depth study on this wave energy converter,by means of the combination of theoretical analysis and physical model *** hydrodynamic characteristics and energy capture of the double-buoy under constant and linear Power Take-Off(PTO)damping are *** of absolute mass and mass ratio are discussed in the theoretical *** displacement amplitude and average power output are tested in the experiment to analyze the effect of the wave period and outer buoy’s mass,while the capture width ratio(CWR)is also *** show that the wave period and mass of the buoys have a significant effect on the *** forms of PTO damping have no influence on the optimal wave period and mass ratio of this *** is recommended to select the double-buoy converter with a mass ratio of 0.80 and to place it in an area with the frequent wave period close to the natural period of the outer buoy to achieve the optimal energy capture.

关键词： coaxial double-buoy wave energy converter hydrodynamic characteristics model test power take-off

Optimal reduction and equilibrium carbon allowance price for the thermal power industry under China’s peak carbon emissions target

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Financial Innovation 2023年第1期9卷 344-370页

作者： Jiaojiao Sun Feng dong School of Economics and Management China University of Mining and TechnologyXuzhou 221116People’s Republic of China

As the largest source of carbon emissions in China,the thermal power industry is the only emission-controlled industry in the first national carbon market compliance *** conversion to clean-energy generation technologies is also an important means of reducing CO_(2)emissions and achieving the carbon peak and carbon neutral *** study used fractional Brownian motion to describe the energy-switching cost and constructed a stochastic optimization model on carbon allowance(CA)trading volume and emission-reduction strategy during compliance period with the Hurst exponent and volatility coefficient in the model *** defined the optimal compliance cost of thermal power enterprises as the form of the unique solution of the Hamilton–Jacobi–Bellman equation by combining the dynamic optimization principle and the fractional It?’s *** this manner,we obtained the models for optimal emission reduction and equilibrium CA *** numerical analysis revealed that,within a compliance period of 2021–2030,the optimal reductions and desired equilibrium prices of CAs changed concurrently,with an increasing trend annually in different peak-year ***,sensitivity analysis revealed that the energy price indirectly affected the equilibrium CA price by influencing the Hurst exponent,the depreciation rate positively impacted the CA price,and increasing the initial CA reduced the optimal reduction and the CA *** findings can be used to develop optimal emission-reduction strategies for thermal power enterprises and carbon pricing in the carbon market.

关键词： Carbon peak Fractional Brownian motion Optimal control Carbon allowance price

Preparation of submicrocrystal Al-Ti-B master alloy and its influence on microstructure and properties of AZ91D

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China Foundry 2017年第6期14卷 513-518页

作者： Tian-shun dong Xiao-dong Zheng Xiao-bing Li Guo-lu Li Tuo Wang Chun-xiang Cui School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China Key Lab. for New Type of Functional Materials of Hebei Province Hebei University of Technology Tianjin 300130 China

To improve the mechanical properties of AZ91D magnesium alloy,the submicrocrystal Al-Ti-B master alloy was prepared with copper mold inject casting method,and the influence of submicrocrystal Al-Ti-B master alloy on the microstructure and mechanical properties of AZ91D was *** show that,the distribution of Ti B_2 phase in submicrocrystal Al-Ti-B alloy is even and disperse,and the average size of Ti Al_3 phase is reduced from 10-30μm to～1μ*** properties of AZ91D refined with submicrocrystal Al-Ti-B master alloy are better than that with coarse-grained Al-Ti-B master alloy without copper mold inject *** tensile strength,elongation and Brinell hardness of AZ91D are increased by 10.6%,25%and 18.1%,***,refinement of AZ91D with submicrocrystal Al-Ti-B that is obtained by copper mold inject casting is an effective method to improve its mechanical properties.

关键词： copper mold inject casting submicrocrystal Al-Ti-B refinement AZ91D

Dynamic Backup Sharing Scheme of Service Function Chains in NFV

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China Communications 2022年第5期19卷 178-190页

作者： dong Zhang Zhifan Zheng Xiang Lin Xiang Chen Chunming Wu College of Computer and Data Science Fuzhou UniversityFuzhou 350108China College of Computer Science and Technology Zhejiang UniversityHangzhou 310058China

Service function chains(SFC)mapping takes the responsibility for managing virtual network functions(VNFs).In SFC mapping,existing solutions duplicate VNFs with redundant instances to provide high availability in response to ***,as a compromise,these solutions result in high resource consumption due to device *** this paper,we propose a novel method named dynamic backup sharing(DBS)that allows SFCs to dynamically share backups to reduce resource *** formulates the problem of sharing backups among different VNFs as an integer linear programming(ILP).Thereafter,we design a novel online algorithm based on dynamic programming to solve the *** experimental results indicate that DBS outperforms state-ofthe-art works by reducing resource consumption and improving the number of accepted requests.

关键词： network function virtualization service function chain mapping reliability backup sharing

Identification and quantification of lead source in sediment in the northern East China Sea using stable lead isotopes

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Journal of Oceanology and Limnology 2021年第5期39卷 1887-1900页

作者： Yu YU Yingxia LI Bing LI Yichao REN Xiaoyu dong School of Marine Science and Engineering Qingdao Agricultural UniversityQingdao 266237China

Stable Pb isotopes in surface and core sediments were determined to identify the sources of Pb contaminants in the northern East China Sea(ECS).The Bayesian stable isotope mixing model was used to quantify the contributions of Pb *** results show that since the late 1980 s,ratios of^(207)Pb/^(206)Pb and^(208)Pb/^(206)Pb increased in the top 34-cm sediment shown in the coastal core samples,reflecting elevated anthropogenic Pb input in coastal *** increase of^(207)Pb/^(206)Pb and^(208)Pb/^(206)Pb ratios in surface sediments reveals that anthropogenic Pb came mainly via atmospheric transmission into the *** sources accounted for 12.0%-21.1%of the total Pb in sediments after the 1990 *** combustion was the largest anthropogenic contributor(47.5%±18.8%),and Pb mining and smelting,cement production,and vehicle exhaust/gasoline contributed 23.2%±7.1%,19.0%±13.0%,and 10.3%±6.9%,*** proportions of the anthropogenic sources gradually increased while geogenic source(riverine sediment)decreased from the coast to the outer *** study demonstrated that the significant influence of atmospheric input of Pb contaminants into the ECS,and also the urgent need to control coal combustion and Pb discharge from industrial dust and fume emission in *** also highlights the promising application of the Simmr model to quantify the proportions of multiple sources of trace elements in an environment.

关键词： lead contamination Bayesian stable isotope mixing model source quantification surface sediment core Changjiang River estuary

Metadynamic recrystallization behaviors of SA508Gr.4N reactor pressure vessel steel during hot compressive deformation

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Journal of Iron and Steel Research International 2021年第1期28卷 46-57页

作者： Shi-bin Qiao Zheng-dong Liu Xi-kou He Chang-sheng Xie Institute for Special Steels Central Iron and Steel Research InstituteBeijing 100081China Collaborative Innovation Centre of Steel Technology University of Science and Technology BeijingBeijing 100083China

The metadynamic recrystallization(MDRX)model is established,and the coefficients determined by multiple linear regression analysis are used to describe the microstructure evolution of SA508Gr.4N *** effects of compression temperature of 950–1150℃,strain rate of 0.001–0.1 s^(-1),pre-strain of 0.3–0.6,initial austenite grain size(IAGS)of 136–552 lm,and interval time of 1–300 s on the MDRX kinetics and microstructure evolution were analyzed,using twopass compression test method on Gleeble thermo-mechanical *** results show that MDRX kinetics and austenite grain size are strongly dependent on compression temperature and strain rate,MDRX volume fraction increases with increasing compression temperature and strain rate,and the grain size decreases with increasing strain rate and decreasing compression temperature,while less affected by the pre-strain and ***,the values predicted using MDRX model and the ones calculated from experiment are compared,and the results show that the proposed model can give a reasonable estimate of MDRX behavior for SA508Gr.4N steel.

关键词： SA508Gr.4N steel Metadynamic recrystallization Kinetic model Grain size model

Bacterial communities and enzyme activities during litter decomposition of Elymus nutans leaf on the Qinghai-Tibet Plateau

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Journal of Mountain Science 2024年第10期21卷 3249-3262页

作者： ZHANG Zhiyang JIAO Yi dong Xiaogang MA Yinshan ZHANG Shiting State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems College of EcologyLanzhou UniversityLanzhou 730000China Center for Volatile Interactions(VOLT)and Terrestrial Ecology Section Department of BiologyUniversity of CopenhagenCopenhagen DK-2100Denmark College of Agriculture and Ecological Engineering Hexi UniversityZhangye 734000China

The dominant plant litter plays a crucial role in carbon(C)and nutrients cycling as well as ecosystem functions maintenance on the Qinghai-Tibet Plateau(QTP).The impact of litter decomposition of dominant plants on edaphic parameters and grassland productivity has been extensively studied,while its decomposition processes and relevant mechanisms in this area remain poorly *** conducted a three-year litter decomposition experiment in the Gansu Gannan Grassland Ecosystem National Observation and Research Station,an alpine meadow ecosystem on the QTP,to investigate changes in litter enzyme activities and bacterial and fungal communities,and clarify how these critical factors regulated the decomposition of dominant plant Elymus nutans(***)*** results showed that cellulose and hemicellulose,which accounted for 95%of the initial lignocellulose content,were the main components in *** litter *** litter enzyme activities ofβ-1,4-glucosidase(BG),β-1,4-xylosidase(BX),andβ-D-cellobiosidase(CBH)decreased with decomposition while acid phosphatase,leucine aminopeptidase,and phenol oxidase increased with *** found that both litter bacterial and fungal communities changed significantly with ***,bacterial communities shifted from copiotrophic-dominated to oligotrophic-dominated in the late stage of litter *** least squares path model revealed that the decomposition of *** litter was mainly driven by bacterial communities and their secreted *** and Proteobacteria were important producers of enzymes BG,BX,and CBH,and their relative abundances were tightly positively related to the content of cellulose and hemicellulose,indicating that Bacteroidota and Proteobacteria are the main bacterial taxa of the decomposition of *** *** conclusion,this study demonstrates that bacterial communities are the main driving forces behind the decomposition of *** litter,high

关键词： Litter decomposition Lignocellulose matrix Bacterial community Litter enzyme activity Elymus nutans Qinghai-Tibet Plateau