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Nano Research 2021年第10期14卷 3386-3394页

作者： Su You Li zhang qing Yang Hefei National Laboratory of Physical Sciences at the Microscale(HFNL) Department of ChemistryLaboratory of Nanomaterials for Energy Conversion(LNEC)University of Science and Technology of ChinaHefei 230026China

Broadband optoelectronic devices intrigue enormous interests on account of their promising potential in optical communications,sensors and environmental *** nanocrystals are promising candidates for the construction of next-generation photodetectors due to their fascinating intrinsic properties and solution-processed compatibility with varied ***,we report the fabrication of a broadband photodetector on the basis of high-quality solution-processed PbSe nanorods in rock-salt phase grown along unconventionally anisotropic growth direction ofzone *** rock-salt PbSe nanorods are synthesized in solution phase over the catalysis of Ag2Se with relatively high-temperature body-centered cubic phase via a solution-solid-solid growth regime using oleylamine and oleic acid as solvents and stabilizer surfactants,from which the PbSe nanorods with the unconventionally anisotropic growth direction are controllably grown in size and shape in the synthetic procedure typically with about 17 nm in diameter and 58 nm in length on ***,the PbSe nanorods-based photodetector exhibits a broadband response from 405 to 1,064 nm with a high responsivity of 0.78 A·W^(-1)and a fast response time of 17.5μ*** response time is much faster in comparison with most of the PbSe-based photodetectors with response time in millisecond level.

关键词： PbSe nanorod solution-solid-solid(SSS)growth regime superionic conductor catalysis unconventionally anisotropic growth direction near-infrared photodetector broadband photodetection

Vertical Diffusion Coefficient with Stratification Effect for Silty Sediment Suspension Under Waves

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China Ocean Engineering 2023年第2期37卷 323-332页

作者： YANG Guang-yao zhang qing-he State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

To analyze previous experimental data of suspended sediment concentration for silty sediment with different sediment particle sizes due to waves, a new stratification correction coefficient is presented. The suspended sediment concentration gradient and sediment particle diameter are selected as parameters. Furthermore, a diffusion coefficient model with a stratification effect over the whole water depth for silty sediment suspension under waves is developed. The comparison between the suspended sediment concentration calculated by the presented model and several groups of experimental data shows that the model can reasonably reflect the vertical distribution of silty sediment *** stratification effect calculated by the present model decreases with an increase in the sediment particle diameter,which indicates that the model can be extended to describe the suspended sediment concentration of fine to medium sand when the near-bottom sediment concentration is not very high. Although the original model needs to be iteratively solved, the approximate method without iteration is recommended for applications when the near bottom sediment concentration is between 10 and 20 kg/m~3 due to the small difference between the non-iterative and iterative solution for near bed layer suspended sediment concentration, which plays a major role in sediment transport.

关键词： stratification silty sediment suspension diffusion coefficient wave

Systematic diesel molecular performance evaluation based on quantitative structure-property relationship model

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Petroleum Science 2022年第2期19卷 809-818页

作者： Guang-qing Cai Lin-Zhou zhang State Key Laboratory of Heavy Oil Processing Petroleum Molecular Engineering Center(PMEC)China University of PetroleumBeijing 102249China

The production and separation of optimal molecules in diesel fuels require a systematic property evaluation for the containing *** paper evaluates the diesel molecules based on four key quality indicators:low-temperature fluidity,cleanliness,ignition,and power *** established the corresponding quantitative structure-property relationship models for corresponding properties,which are freezing point,yield sooting index,cetane number,and combustion *** models were applied for the screening of the high-performance molecules that is suitable for *** molecular performance distribution of the conventional diesel and biodiesel were also ***,we analyzed the effect of different transformation paths on molecular properties,giving guidance on the conversion process design.

关键词： Diesel Optimal molecules QSPR Molecular screening

Optimal Grouping of Heterogeneous Components in Series and Parallel Systems Under Archimedean Copula Dependence

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Journal of Systems Science & Complexity 2022年第3期35卷 1030-1051页

作者： FANG Longxiang zhang Xinsheng JIN qing Department of Mathematics and Statistics Anhui Normal UniversityWuhu 241000China Department of Statistics Fudan UniversityShanghai 200433China

This paper considers series and parallel systems comprising n components drawn from a heterogeneous population consisting of m different *** components within each subpopulation are assumed to be dependent,while the subpopulations are independent of each *** authors also assume that the subpopulations have different Archimedean copulas for their *** this setup,the authors discuss the series and parallel systems reliability for three different cases,*** authors use the theory of stochastic orders and majorization to establish the main results,and finally present some numerical examples to illustrate all the results established here.

关键词： Archimedean copula majorization parallel system reliability Schur-convex/concave function series system stochastic orders

Weldability of 1000 MPa Grade Ultra-low Carbon Bainitic Steel

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Journal of Iron and Steel Research International 2016年第7期23卷 705-710页

作者： qing-mei JIANG Xiao-qiang zhang Li-qing CHEN Pipeline Department of China Petroleum Pipeline Engineering Corporation Langfang 065000 Hebei China State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 Liaoning China

Maximum hardness test in weld heat-affected zone（HAZ）,oblique Y-groove cracking test and mechanical property test of welding joint of 1 000 MPa grade ultra-low carbon bainitic steel were carried out,so as to research the weldability of the *** results show that the steel has lower cold cracking sensitivity,and preheating temperature of 100 ℃ can help completely eliminate cold cracks,generating good process *** increase of preheating temperature can reduce the hardening degree of heat-affected *** strength of welding joint decreases and hardness reduces when heat inputs increase,and excellent mechanical properties can be obtained when low welding heat inputs are *** lath bainites of different orientations combined with a few granular bainites that effectively split the original coarse austenite grains are the foundation of good properties.

关键词： ultra-low carbon bainitic steel weldability cold cracking microstructure mechanical property

The electromagnetic response of composition-regulated honeycomb structural materials used for broadband microwave absorption

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Journal of Materials Science & Technology 2021年第29期88卷 203-214页

作者： Huifang Pang Yuping Duan Xuhao Dai Lingxi Huang Xuan Yang tuo zhang Xiaoji Liu Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116085China

The undesirable absorption bandwidth is the main limitation for the application of microwave absorbing *** that the design of structure and composition of absorbing coating allows it to obtain a satisfying absorption bandwidth and to avoid weight increasing,honeycomb and its sandwich structures coated by various absorbant have been developed and measured using an arch measurement system over2-18 *** further understand the absorption mechanisms of honeycomb structural materials,simulation based on finite element method and transmission line theory is performed to analyze the different responses to the applied microwave between honeycomb structural materials and uniform-medium slab *** proper composition design allows control over the microwave loss mechanisms,which optimize the coating to possess both of the dielectric and magnetic *** the honeycomb structural materials,the magnetic resonation is found for the first time,which is resulting from the periodic honeycomb walls on both sides of the dielectric cavity(consisting of the aramid paper interlayer and vacuum hexagonal prisms).In addition,the conversion of structure from solid to honeycomb brings about changes in impedance,propagating path,effective wavelength,effective attenuation area,microwave phases,and inductive coupling effect,etc.,which result in a better microwave absorbing *** honeycomb sandwich structure coated by CIP/CB/EP with the weight ratio of 4:0.03:1 shows the absorption bandwidth of~9.8 GHz for reflection loss(RL)lower than-10 dB which covers part of the S and C bands and almost the whole X and Ku bands.

关键词： Microwave absorption Structural materials Honeycomb Electromagnetic response

Resilient and Safe Platooning Control of Connected Automated Vehicles Against Intermittent Denial-of-Service Attacks

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1234-1251页

作者： Xiaohua Ge qing-Long Han qing Wu Xian-Ming zhang the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourne VIC 3122Australia the School of Engineering and Technology Central Queensland UniversityRockhampton QLD 4701Australia

Connected automated vehicles(CAVs)serve as a promising enabler for future intelligent transportation systems because of their capabilities in improving traffic efficiency and driving safety,and reducing fuel consumption and vehicle emissions.A fundamental issue in CAVs is platooning control that empowers a convoy of CAVs to be cooperatively maneuvered with desired longitudinal spacings and identical velocities on *** paper addresses the issue of resilient and safe platooning control of CAVs subject to intermittent denial-of-service(DoS)attacks that disrupt vehicle-to-vehicle ***,a heterogeneous and uncertain vehicle longitudinal dynamic model is presented to accommodate a variety of uncertainties,including diverse vehicle masses and engine inertial delays,unknown and nonlinear resistance forces,and a dynamic platoon ***,a resilient and safe distributed longitudinal platooning control law is constructed with an aim to preserve simultaneous individual vehicle stability,attack resilience,platoon safety and ***,a numerically efficient offline design algorithm for determining the desired platoon control law is developed,under which the platoon resilience against DoS attacks can be maximized but the anticipated stability,safety and scalability requirements remain ***,extensive numerical experiments are provided to substantiate the efficacy of the proposed platooning method.

关键词： Connected automated vehicles(CAVs) cooperative adaptive cruise control denial-of-service(DoS)attacks resilient control vehicle platooning vehicle-to-vehicle communication

On Proximinality of Convex Sets in Superspaces

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Acta Mathematica Sinica,English Series 2016年第6期32卷 633-642页

作者： Li Xin CHENG Zheng Hua LUO Wen zhang Ben tuo ZHENG School of Mathematical Sciences Xiamen University School of Mathematical Sciences Huaqiao University Department of Mathematical Sciences the University of Memphis

Abstract In this paper, we show that a closed convex subset C of a Banach space is strongly proximinal （proximinal, resp.） in every Banach space isometrically containing it if and only if C is locally （weakly, resp.） compact. As a consequence, it is proved that local compactness of C is also equivalent to that for every Banach space Y isometrically containing it, the metric projection from Y to C is nonempty set-valued and upper semi-continuous.

关键词： Proximinality convex set local compactness Banach space

A macro-meso constitutive law for concrete having imperfect interface and nonlinear matrix

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Science China(Technological Sciences) 2009年第3期52卷 634-640页

作者： qing zhang XiaoZhou Xia Department of Engineering Mechanics Hohai University Nanjing 210098 China Institute of Construct Guangdong University of Technology Guangzhou 510006 China

The overall behavior of concrete depends on its meso structures such as aggregate shape, interface status, and mortar matrix property. The two key meso structure characters of concrete, bond status of interface and nonlinear property of matrix, are considered in focus. The variational structure principle is adopted to establish the macro-meso constitutive law of concrete. Specially, a linear reference composite material is selected to make its effective behavior approach the nonlinear overall behavior of concrete. And the overall property of linear reference composite can be estimated by classical estimation method such as self-consistent estimates method and Mori-Tanaka method. This variational structure method involves an optimum problem ultimately. Finally, the macro-meso constitutive law of concrete is established by optimizing the shear modulus of matrix of the linear reference composite. By analyzing the constitutive relation of concrete established, we find that the brittleness of concrete stems from the imperfect interface and the shear dilation property of concrete comes from the micro holes contained in concrete.

关键词： imperfect interface matrix nonlinear property variational structure principle macro-meso constitutive law concrete

An IP mobility management scheme with dual location areas for IP/LEO satellite network

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第5期13卷 355-364页

作者： Zhu zhang qing GUO Communication Research Center Harbin Institute of TechnologyHarbin 150001China

One of the issues of mobility management in a low Earth orbit (LEO) satellite network is the high-frequency location binding update initiated by mobile nodes (MNs).To solve this problem,we propose a location management scheme based on dual location area (LA) in an IP/LEO satellite *** proposed scheme uses two kinds of LA,the fixed Earth station LA and satellite LA,to manage the location of the MNs *** operate the binding update procedures only when they are moving out of both of the two LAs last *** location information of MN is used in the binding update procedures,so that the network can page the idle MNs near their last registered location first,to enhance the probability of paging success.A detailed description of the implementation of the scheme is *** analysis shows that the proposed scheme reduces the location management cost and minimizes the influences of the distance between MN and its home *** cost is also reduced by introducing geographical location information in the binding update procedures.

关键词： Location management IP/LEO satellite network Mobile IP (MIP) GPS