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Characterization of Passive Films Formed on As-received and Sensitized AISI 304 Stainless Steel

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Chinese Journal of Mechanical Engineering 2019年第2期32卷 61-72页

作者： Yubo Zhang Hongyun Luo Qunpeng zhong Honghui Yu Jinlong lv Key Laboratory of Aerospace Materials and Performance (Ministry of Education) School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics The Collaborative Innovation Center for Advanced Aero-Engine (CICAAE) Beijing University of Aeronautics and Astronautics Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beijing University of Aeronautics and Astronautics China Waterborne Transport Research Institute Beijing Key Laboratory of Fine Ceramics Institute of Nuclear and New Energy Technology Tsinghua University

The current research of corrosion resistance of stainless steels mainly focuses on characterization of the passive films by point defect mode and mixed-conduction model. The corrosion resistance of the passive films formed on asreceived and sensitized AISI304 stainless steel in borate bu er solution were evaluated in this paper. The degree of sensitization and corrosion resistance of AISI304 stainless steels was evaluated by double loop electrochemical potentiodynamic reactivation and electrochemical impedance spectroscopy. The passive films formed on the stainless steels were studied by XPS technique. It was found that as-received specimen had higher pitting corrosion potential and corrosion resistance than sensitized one. The Mott-Schottky results showed that sensitized stainless steel had more defects in the passive film than as-received one. The compositions of the passive films were mainly Cr and Fe oxides according to XPS results.

关键词： 304 stainless steel Sensitization Passive films XPS Impedance

Near-infrared and Multicolor Electrochromic Device Based on Polyaniline Derivative

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Chinese Journal of Polymer Science 2014年第8期32卷 1040-1051页

作者： zhong-qiu Tong Hai-ming lv Jiu-peng Zhao 李垚 Center for Composite Materials and Structure Harbin Institute of Technology School of Chemical Engineering and Technology Harbin Institute of Technology

Electroactive conducting copolymers of aniline （ANI） and diphenylamine （DPA） are prepared on indium tin oxide （ITO） surface from 1 mol/L H2SO4 aqueous solution with different feed ratios of ANI to DPA by using a potentiostatic method. FTIR spectra and SEM measurements are used to confirm the formation of copolymers. Due to the combination of the N,N＇-diphenyl benzidine and aniline units in the molecular chain, the copolymer films exhibit improved electrochemical and electrochromic properties, compared to PANI and PDPA. The copolymer [marked as P（ANI9-co-DPA1）] film prepared at a ratio of 9：1 （ANI/DPA） exhibits novel transmittance modulation both in visible and near-infrared （NIR） region between -0.8 V and 0.8 V （52% and 67% respectively） and fast response time （3.6 s for coloration and 2.3 s for bleaching at 600 nm）. An electrochromic device （ECD） based on P（ANI9-co-DPA1） and PEDOT：PSS is also fabricated and shows a multicolor electrochromic performance, with a good optical contrast （29% in visible region and 40% in NIR region）, acceptable response time （8.3 s for coloration and 7.5 s for bleaching at 600 nm） and long-term stability. Clear color changes from transparent （-0.8 V）, bright green （0 V）, seagreen （0.4 V） to dark slate gray （0.8 V） are demonstrated.

关键词： Conjugated polymer Spectroelectrochemistry Electrochromic device Polyaniline.

Crystal structure,phase transitions,and thermodynamic properties of magnesium metavanadate(MgV_(2)O_(6))

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Journal of Magnesium and Alloys 2024年第4期12卷 1449-1460页

作者： Guishang Pei Cheng Pan Dapeng zhong Junyi Xiang Xuewei lv College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China Pangang Group Research Institute Co. Ltd.Panzhihua 617000China

As a promising anode material for magnesium ion rechargeable batteries,magnesium metavanadate(MgV_(2)O_(6))has attracted considerable research interest in recent years.A MgV_(2)O_(6)sample was synthesized via a facile solid-state reaction by multistep-firing stoichiometric mixtures of MgO and V2O5 powder under an air *** solid-state phase transition fromα-MgV_(2)O_(6)toβ-MgV_(2)O_(6)occurred at 841 K and the enthalpy change was 4.37±0.04 kJ/*** endothermic effect at 1014 K and the enthalpy change was 26.54±0.26 kJ/mol,which is related to the incongruent melting ofβ-MgV_(2)O_(6).In situ XRD was performed to investigate phase transition of the as-prepared MgV_(2)O_(6)at high *** cell parameters obtained by Rietveld refinement indicated that it crystallizes in a monoclinic system with the C2/m space group,and the lattice parameters of a=9.280 A°,b=3.501 A°,c=6.731 A°,β=111.76°.The solid-state phase transition fromα-MgV_(2)O_(6)toβ-MgV_(2)O_(6)was further studied by thermal kinetics,indicating that this process is controlled first by a fibril-like mechanism and then by a spherulitic-type mechanism with an increasing heating ***,the enthalpy change of MgV_(2)O_(6)at high temperatures was measured utilizing the drop calorimetry,heat capacity was calculated and given as:Cp=208.3+0.03583T-4809000T^(−2)(298-923 K)(J mol^(−1)K^(−1)),the high-temperature heat capacity can be used to calculate Gibbs free energy of MgV_(2)O_(6)at high temperatures.

关键词： MgV_(2)O_(6) Crystal structure Phase transitions Thermodynamic functions

Energy consumption optimization for edge computing-supported cellular networks based on optimal transport theory

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Science China(Information Sciences) 2024年第2期67卷 201-218页

作者： Xiangyu lv Xiaohu GE Yi zhong Qiang LI Yong XIAO School of Electronic Information and Communications Huazhong University of Science and Technology

With advancements in mobile communication technologies, there have been multiple user device(UD) connections to cellular networks. Because of changes in the spatial distribution of UDs and application requirements, the traditional offloading mechanism based on the nearest distance will result in heavy loads for some base stations(BSs). Because there is a high-order relationship between the energy consumption of the BS processing tasks and the number of computing tasks, the traditional offloading mechanism will result in high energy consumption, and UD’s offloading decision must be dynamically adjusted. The offloading decision of UDs is optimized based on detailed information about various parameters associated with a network from the standpoint of distribution. This information includes details regarding the spatial distribution of UDs,application requirements, and the offloading period of computing tasks. Based on optimal transport theory,an energy consumption optimization algorithm is suggested to lower the total amount of energy consumed by the offloading process of UDs’ computing tasks by reasonably planning the offloading BSs of the UDs in the networks. The simulation results show that the proposed offloading mechanism based on energy consumption optimization reduces the total energy consumption of the offloading process by 28.09% when compared to the traditional offloading mechanism, and the traffic managed by each BS is balanced.

关键词： optimal transport theory edge computing energy consumption reduction dynamic voltage frequency scaling

Traffic Signal Timing via Deep Reinforcement Learning

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IEEE/CAA Journal of Automatica Sinica 2016年第3期3卷 247-254,254+248-253页

作者： Li Li Yisheng lv Fei-yue Wang IEEE Department of Automation Tsinghua University Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences

In this paper, we propose a set of algorithms to design signal timing plans via deep reinforcement learning. The core idea of this approach is to set up a deep neural network (DNN) to learn the Q-function of reinforcement learning from the sampled traffic state/control inputs and the corresponding traffic system performance output. Based on the obtained DNN, we can find the appropriate signal timing policies by implicitly modeling the control actions and the change of system states. We explain the possible benefits and implementation tricks of this new approach. The relationships between this new approach and some existing approaches are also carefully discussed. © 2014 Chinese Association of Automation.

关键词： Algorithms Timing circuits Traffic control Traffic signals

A Novel Vascular Disrupting Agents Noncovalent Polymeric Nanomedicine:Significantly Increased Antitumor Therapeutic Efficiency

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Chinese Journal of Chemistry 2022年第12期40卷 1447-1456页

作者： Jianlin lv Yajun Xu yue Huang Haiyang Yu Zhaohui Tang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefeiAnhui 230026China Jilin Biomedical Polymers Engineering Laboratory 5625 Renmin StreetChangchunJilin 130022China

This work was supported by the National Natural Science Foundation of China(Nos.52025035,52103195).The comprehensive graphic content and graphic abstract were created with *** by coauthors.

关键词： Vascular disrupting agents Antitumor agents Self-assembly Cancer Nanoparticles

Shape-engineering of organic heterostructures via a sequential selfassembly strategy for multi-channel photon transportation

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Nano Research 2022年第4期15卷 3781-3787页

作者： yue Yu Qiang lv Yi Yuan Xue-Dong Wang Liang-Sheng Liao Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipaMacao 999078MacaoChina

The controlled self-assembly of organic heterostructures(OHSs)with precisely defined compositions,architectures,and interfaces,have largely remained a ***,we introduce an effective approach to accurately construct three types of axial branching OHSs including unilateral axial OHSs,bilateral single-branching axial OHSs and bilateral multi-branching axial OHSs through modulating hierarchical charge-transfer intermolecular interactions and sequential crystal nucleation rate on account of the two different cocrystals with the low lattice mismatching rate of~2.2%.The present work opens an avenue for rationally designing and finely synthesizing more kinds of OHSs.

关键词： sequential self-assembly axial heterostructures non-covalent interaction lattice-match multi-channel outputs

Ordered matrix representation supporting the visual analysis of associated data

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Science China(Information Sciences) 2020年第8期63卷 236-238页

作者： Yi CHEN Cheng lv yue LI Wei CHEN Kwan-Liu MA Beijing Key Laboratory of Big Data Technology for Food Safety Beijing Technology and Business University State Key Laboratory of CAD&CG Zhejiang University Department of Computer Science University of California

Associated data, which refer to sets of entities with specific relations and relational weights that can usually be expressed in a relational matrix, are found in many fields. Two typical examples are the pesticide residue dataset in food-safety, in which pesticides are associated with agricultural products [1], and E-transaction dataset, in which there is special relation between buyer and seller [2].However, on large data scales, finding the key en-

关键词： Visualization RW-Rank Ordered Matrix Associated Data Pesticide Residue Data

Methane hydrate formation in porous media:Overview and perspectives

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Journal of Energy Chemistry 2022年第11期31卷 454-480,I0012页

作者： yue Qin Liyan Shang Zhenbo lv Jianyu He Xu Yang Zhien Zhang College of Petroleum Engineering Liaoning Petrochemical UniversityFushun 113001LiaoningChina School of Environmental&Safety Engineering Liaoning Petrochemical UniversityFushun 113001LiaoningChina College of Petroleum and Chemical Engineering Liaoning Petrochemical UniversityFushun 113001LiaoningChina School of Computer Science Shenyang Aerospace UniversityShenyang 110135LiaoningChina Department of Chemical and Biomedical Engineering West Virginia UniversityMorgantownWV 26506United States

Natural gas hydrate(NGH)has recently received more attention as a cleaner alternative energy source that not only reduces carbon emissions caused by the use of conventional fossil fuels but also plays a key role in global climate ***,hydrate-based technologies,particularly hydrate-based carbon capture and storage,have enormous promise for decreasing global carbon emissions,and porous media play an important role in all hydrate-based ***,this paper reviews the recent applications of porous media in the field of methane hydrate(MH)formation and analyzes the influence of porous media systems on MH phase equilibria and formation *** is because the efficiency of hydrate-based technologies is determined mainly by the phase equilibrium and formation kinetics of *** influence of the nature of the media on MH formation in porous media systems is comprehensively summarized to understand how porous media can efficiently enhance the kinetics of hydrate *** are necessary for rapid hydrate formation,and the effect of various promoters on MH formation was also *** on the aforementioned overview and understanding,the mechanisms for MH formation in various porous media systems are ***,the future perspectives and challenges of hydrate-based technologies in tackling global climate change were *** review provides a fundamental understanding of the application and development of porous media in rapid hydrate formation,a fair evaluation of the performance of various porous media systems,and critical insights into major research foci.

关键词： Methane hydrate Porous media Phase equilibrium Kinetics Carbon neutrality