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Lightweight and robust rGO/sugarcane derived hybrid carbon foams with outstanding EMI shielding performance

Journal of Materials Science & Technology 2020年第17期52卷 119-126页

作者： Lei Wang Xuetao shi Junliang Zhang Yali Zhang Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School ofChemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China

Increasingly severe electromagnetic pollution is now in urgent need of materials with lightweight,excellent flame retardancy,and outstanding electromagnetic interference shielding effectiveness(EMI SE).Renewable source-derived carbon foams and graphene have attracted extensive attention due to their 3D porous structure and remarkable electrical conductivity().In this work,annealed sugarcane(ASC)was prepared by removal of lignin from sugarcane via hydrothermal reaction,followed by annealing *** graphene oxide(GO)was filled by vacuum-assisted impregnation process and thermally annealed to obtain the ASC/reduced graphene oxide(rGO)hybrid *** the loading of rGO is 17 wt.%,the ASC/rGO hybrid foam(density,of 0.047 g/cm^3)exhibits the optimal of 6.0 S/cm,EMI SE of 53 dB,specific SE(SSE=SE/)/thickness(t)of 3830 dB·cm^2/g,and compressive strength of 1.33 MPa,which is 76%,36%,13%and 6%higher than those of ASC,***,ASC/rGO presents excellent flame retardancy,thermal stability,and heat insulation,which remains constant under burning on an alcohol lamp and presents low thermal conductivity of 115.19 mW(m·K),close to the requirement for heat *** effect of ASC and rGO not only significantly increase of ASC/rGO,but fully utilizes the capability of ASC and rGO to attenuate electromagnetic waves by virtue of unique porous structures and abundant *** kind of lightweight EMI materials with excellent mechanical property,shielding performance,flame retardancy,and heat insulation is expected to tackle the key scientific and technical bottleneck problems of EMI materials,and will greatly expand the application of carbon nanomaterials in the field of aerospace industry.

关键词： Electromagnetic interference Annealed sugarcane/rGO Porous structure Carbon nanomaterials

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UAV cooperative air combat maneuver decision based on multi-agent reinforcement learning

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Journal of Systems Engineering and Electronics 2021年第6期32卷 1421-1438页

作者： ZHANG jiandong YANG Qiming shi Guoqing LU Yi WU Yong School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Shenyang Aircraft Design Institute Shenyang 110035China

In order to improve the autonomous ability of unmanned aerial vehicles(UAV)to implement air combat mission,many artificial intelligence-based autonomous air combat maneuver decision-making studies have been carried out,but these studies are often aimed at individual decision-making in 1 v1 scenarios which rarely happen in actual air *** on the research of the 1 v1 autonomous air combat maneuver decision,this paper builds a multi-UAV cooperative air combat maneuver decision model based on multi-agent reinforcement ***,a bidirectional recurrent neural network(BRNN)is used to achieve communication between UAV individuals,and the multi-UAV cooperative air combat maneuver decision model under the actor-critic architecture is ***,through combining with target allocation and air combat situation assessment,the tactical goal of the formation is merged with the reinforcement learning goal of every UAV,and a cooperative tactical maneuver policy is *** simulation results prove that the multi-UAV cooperative air combat maneuver decision model established in this paper can obtain the cooperative maneuver policy through reinforcement learning,the cooperative maneuver policy can guide UAVs to obtain the overall situational advantage and defeat the opponents under tactical cooperation.

关键词： decision-making air combat maneuver cooperative air combat reinforcement learning recurrent neural network

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Human-Like Decision-Making of Autonomous Vehicles in Dynamic Traffic Scenarios

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IEEE/CAA Journal of Automatica Sinica 2023年第10期10卷 1905-1917页

作者： Tangyike Zhang Junxiang Zhan jiamin shi Jingmin Xin nanning Zheng National Key Laboratory of Human-Machine Hybrid Augmented Intelligence National Engineering Research Center for Visual Information and ApplicationsXi’an 710049 Institute of Artificial Intelligence and Robotics Xi’an Jiaotong UniversityXi’an 710049China Momenta Shanghai 201804China

With the maturation of autonomous driving technology, the use of autonomous vehicles in a socially acceptable manner has become a growing demand of the public. Human-like autonomous driving is expected due to the impact of the differences between autonomous vehicles and human drivers on *** human-like decision-making has become a research hotspot, a unified theory has not yet been formed, and there are significant differences in the implementation and performance of existing methods. This paper provides a comprehensive overview of human-like decision-making for autonomous vehicles. The following issues are discussed: 1) The intelligence level of most autonomous driving decision-making algorithms;2) The driving datasets and simulation platforms for testing and verifying human-like decision-making;3) The evaluation metrics of human-likeness;personalized driving;the application of decisionmaking in real traffic scenarios;and 4) The potential research direction of human-like driving. These research results are significant for creating interpretable human-like driving models and applying them in dynamic traffic scenarios. In the future, the combination of intuitive logical reasoning and hierarchical structure will be an important topic for further research. It is expected to meet the needs of human-like driving.

关键词： Autonomous vehicles decision-making driving behavior human-like driving

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Interplay between geometric and electronic structures of Pt entities over TiO_(2) for CO oxidation

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Science China Chemistry 2024年第2期67卷 705-714页

作者： Xixiong Zhang Wen shi Shaobo Han Yong Li Wenjie Shen School of Chemistry Dalian University of TechnologyDalian116024China State Key Laboratory of Catalysis Dalian Institution of Chemical PhysicsChinese Academy of SciencesDalian116023China

Monodispersed Pt colloids with a mean size of 2 nm were deposited uniformly on the {110} facets of a rod-shaped rutile TiO_(2),forming a well-defined Pt/TiO_(2) *** treatment of this precursor at elevated temperatures re-dispersed the Pt particles into clusters and ***-calcination at 673 K partially oxidized the Pt particle surface,while calcination at 773 K yielded Pt Oxclusters of 1.6 nm in 7–8 atomic *** calcination at 873 K formed a mixture of raft-like PtO_(x) clusters(1.6 nm,1–2 atomic layers) and cationic *** tested for CO oxidation at 373 K,the Pt particles showed a higher activity than the Pt Oxclusters,whereas the cationic single-atoms were much less *** H_(2)-reduction at 473 K converted the partially oxidized Pt particles into the metallic species,but they were encapsulated by TiO_(2)–xoverlayers because of the strong metal–support interactions,which decreased the activity dramatically.H_(2)-reduction of the PtO_(x) clusters at473 K enhanced the fraction of metallic Pt species without changing the size and geometry,and promoted the activity substantially.H_(2)-treatment of Pt single-atoms at 473 K increased the activity only moderately because most Pt species still kept at cationic *** results straightforwardly differentiated the catalytic behavior of Pt particles,clusters and single-atoms at the same metal loading and over the same TiO_(2) support,and further demonstrated that the electronic structures of Pt entities played a decisive role in the catalytic oxidation,in addition to the specified sizes.

关键词： Pt/TiO_(2)catalyst size effect Pt clusters active sites electronic structures CO oxidation

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Heat Recuperation for the Self-Condensing CO_(2)Transcritical Power Cycle

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Journal of Thermal Science 2024年第5期33卷 1630-1641页

作者： PAN Lisheng shi Weixiu SUN Yin SUN Yiwei WEI Xiaolin State Key Laboratory of High-temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Environment and Energy Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China

The supercritical CO_(2)Brayton cycle has potential to be used in electricity generation occasions with its advantages of high efficiency and compact *** on a so-called self-condensing CO_(2)transcritical power cycle,a model was established and four different layouts of heat recuperation process were analyzed,a without-recuperation cycle,a post-recuperation cycle,a pre-recuperation cycle and a re-recuperation *** results showed that the internal normal cycle's share of the whole cycle increases with increasing the cooling pressure and decreasing the final cooled *** load in the supercritical heater decreases with increasing the cooling *** perspective of performance,the re-recuperation cycle and the pre-recuperation cycle have similar thermal efficiency which is much higher than other two *** thermal efficiency and net power output have a maximum value with the cooling pressure,except in the condition with the final cooled temperature of 31℃.Considering both the complexity and the economy,the pre-recuperation cycle is more applicable than the other *** 35℃of the final cooled temperature,the thermal efficiency of the pre-recuperation cycle reaches the peak 0.34 with the cooling pressure of 8.4 MPa and the maximum net power output is 2355.24 kW at 8.2 MPa of the cooling pressure.

关键词： CO_(2)transcritical power cycle heat recuperation process self-condensing

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Cryospheric functions and services

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Advances in Climate Change Research 2019年第2期10卷 69-70页

作者： KANG shi-Chang WANG Xiaoming State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences (CAS) Lanzhou 730000 China CAS Centre for Excellence in Tibetan Plateau Earth Sciences Beijing 100101 China University of Chinese Academy of Sciencesy Beijing 100049 China

The cryosphere is the sphere around the Earth that has a certain thickness, existing at a temperature below 0 ℃, and it comprises components mainly including glaciers, ice sheets, snow cover, permafrost, lake and river ice, sea ice, and ice shelves. It is regarded as one of spheres in the climate system, and well known for its sensitivity to climate change. Cryospheric science is an interdisciplinary subject related to all cryospheric components and is also linked to other earth sciences, including studies of the atmosphere, hydrosphere, biosphere, lithosphere, and anthroposphere (Qin et al., 2017).

关键词： sphere Earth temperature

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Quantifying the effects of long-term news on stock markets on the basis of the multikernel Hawkes process

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Science China(Information Sciences) 2021年第9期64卷 44-56页

作者： Xiao DING Jihao shi Junwen DUAN Bing QIN Ting LIU Research Center for Social Computing and Information Retrieval

Recent studies have revealed that long-term financial news can affect stock markets. However,previous research mainly focuses on modeling the short-term effects of financial news and suffers from the weak ability of quantifying the time-decaying influence of financial news. To fill this gap, this study introduces the Hawkes process to estimate the time-decaying influence of long-term financial news. However, the performance of the conventional Hawkes process is sensitive to the choice of kernel functions. Hence, we propose a novel multikernel-powered Hawkes process framework, which uses multiple kernels to model different time-decaying rates, thus alleviating the instability of our proposed Hawkes process based prediction *** results show that the proposed framework yields state-of-the-art stock market prediction accuracies on 515 listed companies and gains more profits in market trading simulation compared with baseline methods. News-based stock prediction can complement studies on price-volume-based stock prediction.

关键词： Hawkes process multikernel function stock market prediction long-term news effects

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Not vegetation itself but mis-revegetation reduces water resources

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Science China Earth Sciences 2021年第3期64卷 404-411页

作者： Guoyi ZHOU Jun XIA Ping ZHOU Tingting shi Lin LI Institute of Ecology and School of Applied Meteorology Nanjing University of Information Science&TechnologyNanjing210044China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China Research Center of Water Resources Chinese Academy of SciencesBeijing100101China Guangdong Open Laboratory of Geospatial Information Technology and Application Guangzhou Institute of GeographyGuangdong Academy of SciencesGuangzhou510070China

Increasing greening of planet Earth to slow down the rise of atmospheric CO_(2) concentrations is certainly desirable;however,its consequences on water resources are less affirmative and thus are a matter of wide ***,as the largest and most successful country of the world in terms of artificial revegetation,is naturally the focus of the concerns and *** on previous studies,we analyzed the mechanism for the effects of climate and watershed characteristics on water resources,explained various hydrological results and phenomena,and considered the ways in which water consumption by artificial revegetation projects can be ***,some guidelines are suggested for artificial revegetation at watershed scale with consideration of water resource *** findings of this study highlight the need for more top-down approaches when studying the mechanism of"forest and water".

关键词： Greening Climate Revegetation Water resources Top-down approaches

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Detection of Resistance and Cross-resistance to Four ALS-inhibiting Herbicides of Scirpus juncoides Roxb. in Paddy Field in Heilongjiang Province

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Journal of Northeast Agricultural University(English Edition) 2019年第2期26卷 1-14页

作者： Liu Ya-guang Zhang Zheng-nan shi Hui Zhu Jin-wen Wu Hui-peng College of Agriculture Northeast Agricultural UniversityHarbin 150030China College of Agricultural Science and Biotechnology Zhejiang UniversityKey Laboratory of Molecular Biology of Crop and PestMinistry of AgricultureHangzhou 310029China

The resistance and cross-resistance of Scirpus juncoides *** ALS-inhibiting herbicides were tested to provide theoretical basis for effectively control Scirpus juncoides *** rational use of *** identify the resistance and crossresistance of 19 populations from nine areas in Heilongjiang Province to four ALS-inhibiting herbicides by agar method and the whole-plant *** results are as the followings,the two bioassay methods had good correlation,the resistance indexes in the same area were different by two means,but resistant level was the same,similarity up to 89.5%.The resistant rates to pyrazosulfuronethyl,bensulfuron-methyl,penoxsulam and pyribenzoxim were 26.3%,36.8%,36.1%and 21.1%,*** populations evolved the highest level of resistance to pyrazosulfuron-methyl with a resistance index of ***,Tonghe,Fangzheng and Jixi populations showed cross-resistance to four ALS-inhibiting herbicides,accounting for 26.3%.The resistance of Scirpus juncoides *** four ALS-inhibiting herbicides in Heilongjiang paddy field was low to moderate,five populations showed cross-resistance to four ALS-inhibiting herbicides.

关键词： Scirpus juncoides Roxb. ALS-inhibiting herbicide resistance cross-resistance

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Electrocatalytic water splitting:Mechanism and electrocatalyst design

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nano Research 2023年第7期16卷 9142-9157页

作者： Han Wu Qiaoxian Huang Yuanyuan shi jiangwei Chang Siyu Lu Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China

Hydrogen energy,a new type of clean and efficient energy,has assumed precedence in decarbonizing and building a sustainable carbon-neutral ***,hydrogen production from water splitting has seen considerable advancements owing to its advantages such as zero carbon emissions,safety,and high product *** overcome the large energy barrier and high cost of water splitting,numerous efficient electrocatalysts have been designed and ***,various difficulties in promoting the industrialization of electrocatalytic water splitting ***,as high-performance electrocatalysts that satisfy industrial requirements are urgently needed,a better understanding of water-splitting systems is *** this paper,the latest progress in water electrolysis is reviewed,and experimental evidence from in situ/operando spectroscopic surveys and computational analyses is summarized to present a mechanistic understanding of hydrogen and oxygen evolution ***,some promising strategies,including alloying,morphological engineering,interface construction,defect engineering,and strain engineering for designing and synthesizing electrocatalysts are *** believe that this review will provide a knowledge-guided design in fundamental science and further inspire technical engineering developments for constructing efficient electrocatalysts for water splitting.

关键词： water splitting mechanism operando spectroscopy design strategy

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