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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1379-1387页

作者： Qiu-wei xing Jiang Ma Yong Zhang Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory of Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China

High-entropy alloys(HEAs)generally possess complex component combinations and abnormal *** traditional methods of investigating these alloys are becoming increasingly inefficient because of the unpredictable phase transformation and the combination of many *** development of compositionally complex materials such as HEAs requires high-throughput experimental methods,which involves preparing many samples in a short *** we apply the high-throughput method to investigate the phase evolution and mechanical properties of novel HEA film with the compositional gradient of(Cr,Fe,V)-(Ta,W).First,we deposited the compositional gradient film by ***,the mechanical properties and thermal stability of the(Cr0.33Fe0.33V0.33)x(Ta0.5W0.5)100−x(x=13-82)multiplebased-elemental(MBE)alloys were *** the deposited wafer was annealed at 600℃for 0.5 h,the initial amorphous phase was transformed into a body-centered cubic(bcc)structure phase when x=*** were observed on the film surface when x was 72 and ***,the highest hardness of as-deposited films was found when x=18,and the maximum hardness of annealed films was found when x=33.

关键词： high-throughput fabrication hard coating thermal resistance mechanical property phase stability high-entropy alloys

Aerial refueling scheduling of multi-receiver and multi-tanker under spatial-temporal constraints for forest firefighting

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Chinese Journal of Aeronautics 2024年第5期37卷 71-91,I0001页

作者： Jing HUANG Jiaqi xing Jinrui ren Quan QUAN Youmin ZHANG Department of Information and Control Engineering Xi’an University of TechnologyXi’an 710048China Jiujiang Measuring Test Technology Research Institute Jiujiang 332000China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China School of Automation Xi’an University of Posts&TelecommunicationsShaanxiXi’an 710121China Department of Mechanical Industrial and Aerospace EngineeringConcordia UniversityMontreal H3G 1M8Canada

Forest fires pose a significant threat to human life and property,so the utilization of unmanned aircraft systems provides new ways for forest *** the constrained load capacities of these aircraft,aerial refueling becomes crucial to extend their operational time and *** order to address the complexities of firefighting missions involving multi-receiver and multi-tanker deployed from various airports,first,a fuel consumption calculation model for aerial refueling scheduling is established based on the receiver ***,two distinct methods,including an integrated one and a decomposed one,are designed to address the challenges of establishing refueling airspace and allocating tasks for *** methods aim to optimize total fuel consumption of the receivers and tankers within the aerial refueling scheduling *** optimization problem is established as nonlinear optimization models along with *** integrated method seamlessly combines refueling rendezvous point scheduling and tanker task allocation into unified *** has a complete solution space and excels in optimizing total fuel *** decomposed method,through the separation of rendezvous point scheduling and task allocation,achieves a reduced computational ***,this comes at the cost of sacrificing optimality by excluding specific feasible ***,numerical simulations are carried out to verify the feasibility and effectiveness of the proposed *** simulations yield insights crucial for the practical engineering application of both the integrated and decomposed methods in real-world *** comprehensive approach aims to enhance the efficiency of forest firefighting operations,mitigating the risks posed by forest fires to human life and property.

关键词： Aerial refueling Scheduling Planning Spatial-temporal constraint Firefighting

Boosting stability of inverted perovskite solar cells with magnetron-sputtered molybdenum rear electrodes

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Rare Metals 2023年第11期42卷 3741-3754页

作者： Zhao-Yi Jiang Ming Pan Fu-Meng ren Rui Chen Zhen-xing Sun Zhi-Chun Yang Zong-Hao Liu wei Chen Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China Optics Valley Laboratory Hubei430074China C Innovation Laboratory Contemporary Amperex Technology Ltd.Ningde352100China State Key Lab of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China

Perovskite solar cells(PSCs)have attracted widespread attention because of their remarkable efficiency,low cost,and ease of ***,the operational stability of the PSCs still suffers from the corrosion of metal electrodes induced by metal-halide ***,we propose a feasible strategy for improving the stability of inverted PSCs by using magnetron-sputtered Mo rear *** with a bismuth(Bi)buffer layer prepared by thermal evaporation,the damage from the magnetron sputtering process toward the underlayers can be effectively ***,based on the Bi+Mo bilayer electrode,the inverted PSCs with a NiMgLiO hole transport layer exhibited a power conversion efficiency(PCE)of 18.82%.In addition to their excellent stability at high temperatures,compact Mo films can inhibit the decomposition of Perovskite(Pvk)films in the *** PSCs with the Bi/Mo bilayer electrode maintained 97.9%of its initial efficiency,showing better stability than PSCs with the traditional Ag electrode after aging for 3000 h under continuous light illumination.

关键词： Perovskite solar cells(PSCs) Magnetron sputtering Rear electrodes Molybdenum Stability

Effect of microscopic pore structures on ultrasonic velocity in tight sandstone with different fluid saturation

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Petroleum Science 2022年第6期19卷 2683-2694页

作者： Jian-Yong Xie Jun-Jie Zhang wei Xiang Yan-Ping Fang Ya-Juan Xue Jun-xing Cao ren-Fei Tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology(CDUT)Geophysical InstituteChengduSichuan610059China Oilfield Technology Division China National Offshore Oilfield Services Co.ZhanjiangGuangdong524000China School of Communication Engineering Chengdu University of Information TechnologyChengduSichuan610225China State Key Laboratory of Natural Gas Hydrate Beijing100028China

Microcosmic details of pore structure are the essential factors affecting the elastic properties of tight sandstone reservoirs,while the relationships in between are still incompletely clear due to the fact that quantitative or semi-quantitative experiments are hard to ***,three sets of tight sandstone samples from the Junggar Basin are selected elaborately based on casting thin sections,XRD detection,and petro-physical measurement,and each set is characterized by a single varied microcosmic factor(pore connectedness,pore type,and grain size)of the pore *** ultrasonic pulse transmission technique is conducted to study the response of elastic properties to the varied microcosmic details of pore structure in the situation of different pore fluid(gas,brine,and oil)saturation and confining *** show samples with less connectedness,inter-granular dominant pores,and smaller grain size showed greater velocities in normal *** more sensitive to the variations of pore type,while Vsis more sensitive to the variations of grain *** with better connectedness at fluid saturation(oil or brine)show greater sensitivity to the confining pressure than those with gas saturation with a growth rate of 6.9%-11.9%,and the sensitivity is more likely controlled by *** pore types(inter-granular or intra-granular)can be distinguished by the sensitivity of velocities to the variation of pore fluid at high confining pressure(>60 MPa).The samples with small grain sizes tend to be more sensitive to the variations of confining *** this knowledge,we can semi-quantitatively distinguish the complex pore structures with different fluids by the variation of elastic properties,which can help improve the precision of seismic reservoir prediction for tight sandstone reservoirs.

关键词： Tight sandstone Pore structure Casting thin section Ultrasonic measurement

A Comparison Study on Corrosion Resistance of 430 Stainless Steel Surfaces Modified by Alkylsilane and Fluoroalkylsilane SAMs

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Journal of Iron and Steel Research International 2013年第12期20卷 75-81页

作者： WANG Hai-ren XIAO Zhen QU Jun-e YANG Hong-wei CAO Zhi-yong GUO xing-peng School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Faculty of Materials Science and Engineering Hubei University Wuhan Branch Company SINOPEC

The self-assembly monolayers （SAMs） of n-dodecyltriethoxysilane （DTES） and 1 H, 1 H, 2H, 2H-perflu- orodecyltriethoxysilane （PFDS） on the surface of the 430 stainless steel （430SS） were prepared and their corrosion protection performance was investigated by potentiodynamic polarization, Fourier transform infrared spectroscopy （FTIR） -attenuated total reflection （ATR）, static contact angle and atomic force microscopy （AFM）. The results showed that the alkali pretreatment and the water added into the self-assembly solution could generate more hydrox- yls on the 430SS surface, and then enhanced the adsorption of the SAMs. A suitable temperature of the self-assem- bly solution is important for the formation of the SAMs. The silane SAMs were chemically adsorbed on the 430SS substrates by Fe-O-Si bonds. In all cases tested, PFDS has a better inhibition effect compared with DTES, and the difference in inhibition effect is most marked at the lowest concentration of 1 mmol/L.

关键词： 430 stainless steel (430SS) self-assembly monolayer (SAM) silane corrosion protection

Causality Analysis of Futures Sugar Prices in Zhengzhou Based on Graphical Models for Multivariate Time Series

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Acta Mathematicae Applicatae Sinica 2016年第1期32卷 129-136页

作者： Jing XU xing-wei TONG School of Statistics University of International Business and Economics School of Statistics Beijing Normal University

This paper presents a method of constructing a mixed graph which can be used to analyze the causality for multivariate time *** construct a partial correlation graph at first which is an undirected *** every undirected edge in the partial correlation graph,the measures of linear feedback between two time series can help us decide its direction,then we obtain the mixed *** this method,we construct a mixed graph for futures sugar prices in Zhengzhou（ZF）,spot sugar prices in Zhengzhou（ZS） and futures sugar prices in New York（NF）.The result shows that there is a bi-directional causality between ZF and ZS,an unidirectional causality from NF to ZF,but no causality between NF and ZS.

关键词： causality partial spectral coherence partial correlation graph linear feedback mixed graph

Historical experience in the elimination of visceral leishmaniasis in the plain region of Eastern and Central China

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Infectious Diseases of Poverty 2014年第1期3卷 81-91,80页

作者： Li-ren Guan Zhong-xing Wu National Institute of Parasitic Diseases Chinese Center for Disease Control and PreventionShanghai 200025PR China Jiangsu Institute of Parasitic Diseases Wuxi 214064China

Visceral leishmaniasis(VL)(kala-azar)was most seriously prevalent in the plain regions of eight provinces/municipalities in the eastern and central parts of *** the early 1950s,the number of counties/cities endemic for VL and the number of cases in the plain regions accounted for 60%and 80%,respectively,of the total numbers in the entire *** implementing comprehensive control measures,including treatment of patients for eliminating the source of infection and spraying insecticide in endemic villages to kill sandflies,VL transmission has been brought under control in this region by the early 1960s,and no new infected cases have been found since 1983,achieving the goal of eliminating VL.

关键词： Visceral leishmaniasis Elimination Plain region Eastern and Central China

Antitermitic effect of the Lantana camara plant on subterranean termites （Isoptera： Rhinotermitidae）

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Insect Science 2010年第5期17卷 427-433页

作者： wei Ding xing Ping Hu College of Plant Protection Southwest University Chongqing China Department of Entomology and Plant Pathology Auburn University Auburn USA

The insecticidal effects of Lantana camara L. （flowers, leaves, stems and roots） and the soil where lantana had been growing, on foraging activity and survival of the subterranean termites Coptotermes formosanus and Reticulitermes flavipes were examined in a 3-week experiment. The soil in which lantana had been growing had no effect on termite tunneling and survival. Incorporation of chipped fresh lantana leaves and stems into soil had no effect on mortality but caused significant reduction in tunneling. The 5-cm wide barrier of soil with lantana tissue incorporated effectively repelled groups of both species from penetrating the barrier and thus prevented infestation of a piece of wood on the other side of the barrier. C. formosanus was more sensitive in avoiding the barrier than R. flavipes. Leaves, stems and flowers were more repellent than roots. These results provide preliminary evidence that fresh-cut lantana leaves, stems and flowers may have use as additives to garden mulches against termites.

关键词： Coptotermesformosanus Lantana camara L. mulch nonchemical control,repellents Reticulitermesflavipes subterranean termites

High Order Finite Difference Hermite WENO Fixed-Point Fast Sweeping Method for Static Hamilton-Jacobi Equations

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Communications in Computational Physics 2022年第1期31卷 154-187页

作者： Yupeng ren Yulong xing Jianxian Qiu School of Mathematical Sciences Xiamen UniversityXiamenFujian 361005P.R.China Department of Mathematics The Ohio State UniversityColumbusOH 43210USA School of Mathematical Sciences and Fujian Provincial Key Laboratory of Mathematical Modeling and High-Performance Scientific Computing Xiamen UniversityXiamenFujian 361005P.R.China

In this paper, we combine the nonlinear HWENO reconstruction in [43] andthe fixed-point iteration with Gauss-Seidel fast sweeping strategy, to solve the staticHamilton-Jacobi equations in a novel HWENO framework recently developed in [22].The proposed HWENO frameworks enjoys several advantages. First, compared withthe traditional HWENO framework, the proposed methods do not need to introduceadditional auxiliary equations to update the derivatives of the unknown function φ.They are now computed from the current value of φ and the previous spatial derivatives of φ. This approach saves the computational storage and CPU time, which greatlyimproves the computational efficiency of the traditional HWENO scheme. In addition,compared with the traditional WENO method, reconstruction stencil of the HWENOmethods becomes more compact, their boundary treatment is simpler, and the numerical errors are smaller on the same mesh. Second, the fixed-point fast sweeping methodis used to update the numerical approximation. It is an explicit method and doesnot involve the inverse operation of nonlinear Hamiltonian, therefore any HamiltonJacobi equations with complex Hamiltonian can be solved easily. It also resolves someknown issues, including that the iterative number is very sensitive to the parameterε used in the nonlinear weights, as observed in previous studies. Finally, to furtherreduce the computational cost, a hybrid strategy is also presented. Extensive numerical experiments are performed on two-dimensional problems, which demonstrate thegood performance of the proposed fixed-point fast sweeping HWENO methods.

关键词： Hermite method weighted Essentially Non-Oscillatory(WENO)method fixedpoint iteration Hamilton-Jacobi equation hybrid strategy

Controlling the Balance of Photoluminescence and Photothermal Effect in Cyanostilbene-Based Luminescent Liquid Crystals

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Chinese Journal of Chemistry 2022年第8期40卷 902-910页

作者： Xiang-Jian Cao wei Li Jiahua Li Lin Zou xing-Wang Liu Xiang-Kui ren Zhen-Qiang Yu School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300350China College of Chemistry and Environmental Engineering Institute of Low-dimensional Materials Genome InitiativeShenzhen UniversityShenzhenGuangdong 518071China

Molecular motions of the luminescent liquid crystals(LLCs)show a significant effect on fluorescent emission and heat *** this article,a series of cyanostilbene-based LLCs(CSs:CS1-6,CS1-12,CS2-6 and CS2-12)are synthesized to investigate how the pho-toluminescence and photothermal effect *** these materials,the mesogens peripheried by single alkyl chains formed enantiotropic nematic(CS1-6)or smectic C(CS1-12)phase with different alkyl tail *** the single aliphatic chain is re-placed by mini-dendrons,room temperature(RT)monotropic hexagonal columnar phase(CS2-12)or molecular liquid(CS2-6)is *** results revealed that all these materials exhibited high efficiency emission with the highest quantum yield reaching 59.0%.The photoluminescence and photothermal effect can be effectively tuned by dispersing CSs into a commercially available RT liquid crystal matrix 8CB,which output significantly improved photothermal conversion efficiency of 63.2%.Furthermore,the pho-tothermal can rapidly trigger the Smectic A-Nematic-Isotropic sequence transitions of 8CB doped with *** work paves a way of adjusting the balance of photoluminescence and photothermal properties of the LLC materials.

关键词： Aggregation-induced emission Liquid crystals Molecular motions Photothermal effect Phase transitions