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基于预训练模型TD3的干扰目标分配方法

电子信息对抗技术 2024年第4期39卷 1-7页

作者：余晨唐建强杨益川李昊中国电子科技集团公司第二十九研究所成都610036

干扰机有效压制雷达目标探测范围对突防任务至关重要,针对多对多干扰目标分配场景中传统优化算法存在的干扰目标分配求解缓慢的问题,提出一种基于预训练模型TD3(Twin Delayed Deep Deterministic policy gradient algorithm)的干扰目标... 详细信息

干扰机有效压制雷达目标探测范围对突防任务至关重要,针对多对多干扰目标分配场景中传统优化算法存在的干扰目标分配求解缓慢的问题,提出一种基于预训练模型TD3(Twin Delayed Deep Deterministic policy gradient algorithm)的干扰目标分配方法。该方法利用预训练的深度神经网络初始化TD3算法中的动作网络和评价网络,以提高TD3算法与环境的交互训练效率,使完成训练之后的TD3算法能够根据战场态势输出干扰目标分配方案。仿真验证表明,在多对多干扰目标分配场景中,该方法可实现秒量级以下的干扰目标分配方案有效决策。

关键词：干扰目标分配突防任务深度神经网络 TD3

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低熔点合金相变热沉设计与散热性能研究

电子机械工程 2024年第4期40卷 22-27页

作者：陈显才黄官正古智祥西南电子设备研究所四川成都610036

为了解决电子设备在无风无液环境下短时动态大功率工作时的散热问题,提出了一种带导热翅片结构的低熔点合金相变热沉,同时建立了考虑合金液固相变时体积收缩影响的热仿真模型,并对低熔点合金相变热沉的散热性能进行了仿真和试验研究。... 详细信息

为了解决电子设备在无风无液环境下短时动态大功率工作时的散热问题,提出了一种带导热翅片结构的低熔点合金相变热沉,同时建立了考虑合金液固相变时体积收缩影响的热仿真模型,并对低熔点合金相变热沉的散热性能进行了仿真和试验研究。结果表明,低熔点合金相变热沉的散热性能明显优于烷烃类相变热沉。在相同工况下,低熔点合金相变热沉相较于相同体积或质量的烷烃类相变热沉,发热片的最高温度分别降低了71.9℃和32.7℃。另外,发热功率、安装姿态等因素对该类相变热沉的散热性能也有较大影响,与正放时相比,反放和立放时发热片的最高温度分别升高了15℃和12.9℃。

关键词：低熔点合金相变热沉散热性能

Secure analysis over generalized-K channels

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Science China(Information Sciences) 2020年第4期63卷 242-244页

作者： Luyao ZHANG Hui ZHAO Gaofeng PAN Liang YANG Jiawei chen School of Mathematics and Statistics Southwest University Computer Electrical and Mathematical Science and Engineering DivisionKing Abdullah University of Science and Technology School of Information and electronics Beijing Institute of Technology College of Computer Science and electronic Engineering Hunan University

Dear editor,The secrecy outage probability (SOP) is used to estimate the secrecy outage performance when the transmitter has no state information about potential wiretap channels [1], i.e., silent eavesdropping. Most previous work, such as [2, 3], has focused on the SOP defined in [1], which we call the conventional SOP in this study, where both un-

关键词： SOP Secure analysis over generalized-K channels

Identification of surface nanobubbles and resolving their size-dependent stiffness

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Science China(Physics,Mechanics & Astronomy) 2020年第9期63卷 66-76页

作者： YouQuan Jia BinYu Zhao Abbasali Abouei Mehrizi Chuan Wang Yi Xu LongQuan chen School of Mechanics and Engineering Southwest Jiaotong UniversityChengdu 610031China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Leibniz institute of Polymer Research Dresden Dresden 01069Germany

We report a comparative investigation of the topographic features and nanomechanical responses of surface nanobubbles,polymeric nanodrops,and solid microparticles submerged in water and probed by atomic force microscopy in different operating *** show that these microscopic objects exhibit similar topographies,either hemispherical or hemiellipsoidal,in the standard tapping mode,and thus are difficult to ***,distinct differences,caused not only by their different mechanical properties but also by different cantilever tip-sample mechanical interactions that are affected by tip wettability,were observed in successive topographic imaging with controlled scanning forces and the nanoindentation tests,allowing for the identification of surface *** on the indentation force-distance curves,we further extrapolated the stiffness of surface nanobubbles spanning a wide range of sizes and then developed a simple theoretical model to explain this size *** also demonstrate how size-dependent stiffness can be used to determine the surface tension of nanobubbles,which was found to be much lower than the bulk value of water.

关键词： surface nanobubble size-dependent stiffness nanomechanical measurement atomic force microscopy

基于多尺度卷积自编码器的地震噪声智能压制方法及应用

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石油物探 2024年第1期63卷 79-90页

作者：谢晨徐天吉钱忠平沈杰刘胜唐建明文雪康电子科技大学资源与环境学院四川成都611731 电子科技大学长三角研究院(湖州) 浙江湖州313000 油气勘探计算机软件国家工程研究中心东方地球物理公司北京100088 中石化西南油气分公司勘探开发研究院四川成都610041 中石化石油工程地球物理有限公司南方分公司四川成都610041 中国石化西南油气分公司四川成都610041 中国石化西南油气分公司工程监督中心四川德阳618000

针对传统地震噪声压制方法存在的泛化性不足、主观性强以及实际无噪声数据稀缺等问题,利用深度学习方法的泛化特性,在保护有效信号的基础上,建立了一种地震噪声智能压制方法。基于有效利用少量实际无噪声数据的原则,首先通过正演数值模... 详细信息

针对传统地震噪声压制方法存在的泛化性不足、主观性强以及实际无噪声数据稀缺等问题,利用深度学习方法的泛化特性,在保护有效信号的基础上,建立了一种地震噪声智能压制方法。基于有效利用少量实际无噪声数据的原则,首先通过正演数值模拟地震数据构建数据集,再搭建基于InceptionV4卷积模块和注意力机制的卷积自编码器网络,并利用正演数据对网络预训练。该过程首先依靠数据驱动方法和网络强大的特征提取能力初步获取地震数据的有效特征表达,通过正演数值模拟数据试验分析发现,该方法既能有效压制绝大部分随机噪声和相干噪声,还能比DnCNN网络更大程度地避免损伤有效信号;然后,再采用迁移学习的策略和少量实际地震数据继续训练网络,最终获得实际地震数据噪声压制模型。将该方法应用于实际地震数据噪声压制试验,并从压制效果、保幅性等方面评价方法效果,结果表明该方法对于随机噪声、面波等噪声干扰具有一定的压制能力,准确地恢复了有效信号,且具有处理成本低、效率高等优势。

关键词：地震勘探噪声压制卷积自编码器迁移学习注意力机制

Research on Quartz Ceramic Crucible Wastes Applied in Jewelry Casting

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Research on Quartz Ceramic Crucible Wastes Applied in Jewelr...

Hexagonal boron nitride nanosheet for effective ambient N2 fixation to NH3

2011 IEEE International Conference on Waste Recycling,Ecology and Environment(ICWREE 2011)

作者： Zhifan XU1 Yongheng ZHOU1* Shaoxing chen2 Keya SHEN2 Chang CHAN2 1 School of Photo electronic Science and Technology South China Normal University Guangzhou China 2 Jewelry institute of Guangzhou Panyu Polytechnic Guangzhou China

The method of production of cristobalite was based on the use of quartz ceramic crucible wastes as the basic raw material. The gypsum casting material was prepared by mixing cristobalite powder, gypsum and silica powder. Calorific properties were tested and the results showed that when the content of cristobalite was more than 50% , the gypsum casting material showed obvious cracks, which was removed into the air from resistance furnace at 600℃ after the baking process was over. The gypsum casting material showed better therma crack resistance, when 0.3 g glass fiber were added into per 100 g mixed powder, with the content of cristobalite controlled between 40%-30%. In 300-600℃, about 0.4% thermal expansion occurred which effectively compensated for the cooling contraction of jewelry alloy making the casting sample meet production needs.

关键词： quartz ceramic crucible cristobalite therma expansion jewelry casting

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Nano Research 2019年第4期12卷 919-924页

作者： Ya Zhang Huitong Du Yongjun Ma Lei Ji Haoran Guo Ziqi Tian Hongyu chen Hong Huang Guanwei Cui Abdullah M. Asiri Fengli Qu Liang chen Xuping Sun institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China College of Chemistry and Chemical Engineering Qufu Normal University Qufu 273165 China Analytical and Test Center Southwest University of Science and Technology Mianyang 621010 China Ningbo institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China College of Chemistry Chemical Engineering and Materials Science Shandong Normal University Jinan 250014 China Chemistry Department Faculty of Science & Center of Excellence for Advanced Materials Research King Abdulaziz University P.O. Box 80203 Jeddah 21589 Saudi Arabia

Industrial production of NH3 from N2 and H2 significantly relies on Haber-Bosch process,which suffers from high energy consume and CO2 *** a sustainable and environmentally-benign alternative process,electrochemical artificial N2 fixation at ambient conditions,however,is highly required efficient *** this study,we demonstrate that hexagonal boron nitride nanosheet (h-BNNS) is able to electrochemically catalyze N2 to *** acidic solution,h-BNNS catalyst attains a high NH3 formation rate of 22.4 μg·h-1·*** a high Faradic efficiency of 4.7% at-0.75 V *** hydrogen electrode,with excellent stability and *** functional theory calculations reveal that unsaturated boron at the edge site can activate inert N2 molecule and significantly reduce the energy barrier for NH3 fonmation.

关键词： boron nitride nanosheet N2 reduction reaction NH3 electrosynthesis ambient conditions density functional theory

Typical universal entanglers

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Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 1913-1917页

作者： WANG Feng LUO MingXing chen XiuBo YANG YiXian WANG XiaoJun College of mathematical sciences Dezhou University Information Security and National Computing Grid Laboratory Southwest Jiaotong University State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications School of electronic Engineering Dublin City University

A universal entangler is a very powerful fault-tolerant entangling device for generating quantum entanglements from any joint states. Our paper aims to address the construction of universal entanglers. We prove that universal entanglers may be obtained from random unitary gates according to the Harr measure. The success probability is close to 1 for large system spaces. This result represents the typical density of entanglement subspaces in large state spaces. It also partially solves an open problem of universal bipartite entanglers and is explained by some experiment simulations.

关键词： universal bipartite entangler random unitary gate entanglement

Light-Induced Dynamic Stability of Oxygen Vacancies in BiSbO_(4) for Efficient Photocatalytic Formaldehyde Degradation

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Energy & Environmental Materials 2022年第1期5卷 305-312页

作者： Maoxi Ran Wen Cui Kanglu Li Lvcun chen Yuxin Zhang Fan Dong Yanjuan Sun Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China School of Resources and Environment Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China The Center of New Energy Materials and Technology School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China State Centre for International Cooperation on Designer Low-carbon and Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Defect engineering has been regarded as a versatile strategy to maneuver the photocatalytic ***,there are a few studies concerning how to maintain the stability of defects,which is important to ensure sustainable photocatalytic ***,a novel strategy to modulate the structural properties of BiSbO_(4)using light-induced dynamic oxygen vacancies is reported by us for efficient and stable photocatalytic oxidation of ***,the continuous consumption and replenishment of vacancies(namely dynamic vacancies)ensure the dynamic stability of oxygen vacancies,thus guaranteeing the excellent photocatalytic *** oxygen vacancies could also accelerate the electron migration,inhibit the photogenerated electron/hole recombination,widen the light absorption spectra,and thus improve the photocatalytic formaldehyde removal *** with the results of in situ DRIFTS,the reaction mechanism for each step of formaldehyde oxidation is *** supported by DFT calculation of Gibbs free energy,the introduction of oxygen vacancies into BiSbO_(4)can promote spontaneous process of formaldehyde *** work highlights a promising approach for stabilizing the defects and proposes the photocatalytic reaction mechanism in combination with the thermodynamic functions.

关键词： dynamic stability formaldehyde degradation oxygen vacancy photocatalysis reaction mechanism