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IEEE International Conference on Communications in China (ICCC)

作者： Naiyu Zhang Yabin Zhang Congan Xu Wei Zhang Haoran Zha Yu Han Qiao Tian Zeyu Tang Advanced Technology Research Institute Beijing Institute of Technology Jinan China College of Information and Communication Engineering Harbin Engineering University Harbin China Naval Aeronautical University Yantai China National Key Laboratory of Electromagnetic Space Security Chengdu Sichuan China College of computer science Harbin Engineering University Harbin China

ISBN: (数字)9798350378412

ISBN: (纸本)9798350378429

Specific emitter identification (SEI), pivotal in military communication reconnaissance and electronic warfare, also plays a crucial role in civilian spectrum management. Traditional deep neural network methodologies for radiation source recognition face challenges including extended training durations, substantial energy demands, and minimal computational sparsity. In response, this study introduces an advanced deep spiking complex neural network model, leveraging the intrinsic properties of complex data for enhanced expressive power. This model incorporates a binary spike neural layer, significantly optimizing computational efficiency and reducing hardware resource requirements. The efficacy of this model is verified through the application to a real-world ADS-B signal dataset, where it demonstrates superior recognition accuracy of 89%, surpassing conventional lightweight frameworks such as ShuffleNet and MobileNet in parameter efficiency and inference speed.

关键词： Accuracy Computational modeling Biological system modeling Face recognition Neurons Transfer learning Artificial neural networks

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Synthesis and properties of benzoxazole-terminated mesogenic compounds containing tolane with high birefringence and large dielectric anisotropy

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Liquid Crystals 2021年第14期48卷 1978-1991页

作者： Xie, Ning Du, Shenghua Chen, Ran Liu, Guoqing Chen, Pei Weng, Qiang Wang, Jie Gao, Aiai Chen, Xinbing An, Zhongwei Key Laboratory of Applied Surface and Colloid Chemistry (MOE) School of Materials Science and Engineering Shaanxi Normal University Xi’an China Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and Engineering Shaanxi Normal University Xi’an China Shaanxi Engineering Laboratory for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an China Xi’an Caijing Opto-Electrical Science & Technology Co. Ltd Xi’an China

New benzoxazole-terminated mesogenic compounds containing tolane moiety with high birefringence and large dielectric anisotropy, namely, 2-[4-[2-[4-alkoxyphenyl]ethynyl]-2,6-difluoro-phenyl]-benzoxazole derivatives (nPEDFPBx), were synthesised and investigated. Among them, the ones bearing methyl and nitro substituents at 5-position of benzoxazole moiety exhibit stable mesophase ranges of 30–71°C and 55–81°C during heating and cooling processes, respectively, while the non-substituted compounds exhibit no mesophase except the ones with long terminal alkoxy chain (n = 10, 12). Birefringence of nPEDFPBx is obtained from DFT theoretical calculation (0.446–0.583) and experimental measurement (0.395–0.499), respectively, where high birefringence is ascribed to their large π-conjugated molecule composed of benzene ring, acetylene linkage and benzoxazole moiety. Meanwhile, it is found that nPEDFPBx displays large dielectric anisotropy because of their high dipole moment. As an example, the compound 5PEDFPBM is doped into the liquid crystalline mixture as an additive, the properties of the resulting mixture, such as birefringence, dielectric anisotropy, clearing point and response time, are improved obviously, indicating high potential application for liquid crystalline mixture. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Benzoxazole-terminated compounds birefringence dielectric anisotropy liquid crystalline mixture tolane

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In sight of K-deficient layered K_(x)MnO_(2) cathode for potassium-ions batteries

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Journal of Energy Chemistry 2022年第1期31卷 335-343,I0009页

作者： Tiezhong Liu Shuang Hou Youpeng Li Shoufeng Xue Junhua Hu Haikuo Fu Chenghao Yang Lingzhi Zhao Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials Institute of Semiconductor Science and TechnologySouth China Normal UniversityGuangzhou 510631GuangdongChina Guangzhou Key Laboratory for Surface Chemistry of Energy Materials New Energy Research InstituteSchool of Environment and EnergySouth China University of Technology Guangzhou 510631GuangdongChina Institute of Science and Technology Innovation South China Normal UniversityQingyuan 511517GuangdongChina SCNU Qingyuan Institute of Science and Technology In novation Co. Ltd.Qingyuan 511517GuangdongChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina(Qingyuan Jiazhi New Materials Research Institute Co.Ltd.Qingyuan 511517GuangdongChina

Potassium-ions batteries(PIBs)are attracting increasing attention as up-and-coming youngster in largescale grid-level energy storage benefiting from its low-cost and high energy ***,enough researches regarding indispensable cathode materials for PIBs are badly ***,we synthesize K-deficient layered manganese-based oxides(P2-K_(0.21)MnO_(2) and P3-K_(0.23)MnO_(2))and investigate them as cathode of PIBs for the first *** the newcomer of potassium-containing layered manganese-based oxides(K_(x)MnO_(2))group,P2-K_(0.21)MnO_(2) delivers high discharge capacity of 99.3 mAh g^(-1) and P3-K_(0.23)MnO_(2) exhibits remarkable capacity retention rate of 75.5%.Besides,in-situ XRD and ex-situ XRD measurements reveal the reversible phase transition of P2-K_(0.21)MnO_(2) and P3-K_(0.23)MnO_(2) with the potassium-ions extraction and reinsertion,*** work contributes to a better understanding for the potassium storage in K-deficient layered K_(x)MnO_(2)(x≤0.23),possessing an important basic scientific significance for the exploitation and application of layered K_(x)MnO_(2) in PIBs.

关键词： Potassium-ions battery Cathode Layered K_(x)MnO_(2) P2/P3-type structure Low potassium content

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Fabrication of nanoporous Ni and NiO via a dealloying strategy for water oxidation catalysis

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Journal of Energy Chemistry 2020年第11期29卷 125-134页

作者： Xiangrong Ren Yiyue Zhai Qi Zhou Junqing Yan Shengzhong Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina Materials Science and Engineering College Lanzhou University of TechnologyLanzhou 730050GansuChina

Nickel oxides and(oxy)hydroxides are promising replacements for noble-metal-based catalysts owing to their high activity and good long-term stability for the oxygen evolution reaction(OER). Herein, we developed nanoporous Ni by a method of combined rapid solidification and chemical dealloying. Subsequently,nanoporous Ni O was obtained via heating treatment, the macropore and skeleton sizes of the NiO originated from Ni10Al90 alloy are 100–300 nm and 80–200 nm, respectively. Benefiting from the multi-stage nanoporous structure and high specific surface area, the nanoporous NiO demonstrates an outstanding OER, reaching 20 mA cm-2 at an overpotential of 356 mV in 1 M KOH. The corresponding Tafel slope and apparent activation energy are measured to be 76.73 mV dec-1 and 29.0 kJ mol-1, respectively. Moreover,kinetic analysis indicates that the Ni O catalyst shows pseudocapacitive characteristics, and the improved current is attributed to the high-rate pseudocapacitive behavior that efficiently maintains increased nickel redox cycling to accelerate the reaction rates. After 1000 cycles of voltammetry, the overpotential of the NiO decreases by 22 mV(j = 10 mA cm-2), exhibiting excellent stability and durability.

关键词： Rapid solidification Dealloying Nanoporous Ni Electrocatalyst OER

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Effect of Sm2O3 On Microstructure and Wear Resistance Of Cocrfenitinb High Entropy Alloy Coatings By Laser Cladding

SSRN

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SSRN 2024年

作者： Ding, Lin Wang, Hongxin Xiumin, Quan School of Mechanical and Automotive Engineering West Anhui University Anhui 237012 China School of Automobile and Mechanical and Electrical Engineering Lu'an Vocation Technology College Lu'An237158 China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Anhui University of Technology Ministry of Education Maanshan243002 China

CoCrFeNiTiNb high entropy alloys (HEAs) coatings doped with different Sm2O3 addition were fabricated by laser cladding. The effect of Sm2O3 addition on the microstructure and wear resistance of the HEAs coatings was investigated. The results indicated that adding Sm2O3 promoted the formation of BCC phase, retarded the formation of FCC phase. The diffraction peaks of FCC phase shifted to smaller angle as Sm2O3 addition was gradually increased. The microstructure of the HEAs coatings was finer and more uniform after adding Sm2O3, the amounts of the pores was also obviously decreased. The microhardness of CoCrFeNiTiNb HEAs coatings was gradually improved and then decreased after adding Sm2O3, the mass loss and fraction coefficient were also firstly increased and then decreased. The microhardness was improved by 10.1% for 2.0 wt.% Sm2O3 addition, the mass loss was reduced by 12.1%, and the fraction coefficient was the lowest. The wear mechanism of the HEAs coatings was transformed from primary abrasive wear, accompanied by the adhesive wear and oxidative wear to the abrasive wear as Sm2O3 addition was gradually increased. © 2024, The Authors. All rights reserved.

关键词： Laser cladding

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Coexisting Triferroic and Multiple Types of Valley Polarization by Structural Phase Transition in Two-Dimensional Materials

arXiv

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arXiv 2025年

作者： Wu, Chao Sun, Hanbo Dong, Pengqiang Wu, Yin-Zhong Li, Ping State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310027 China State Key Laboratory for Surface Physics Department of Physics Fudan University Shanghai200433 China

The multiferroic materials, which coexist magnetism, ferroelectric, and ferrovalley, have broad practical application prospects in promoting the miniaturization and integration of spintronic and valleytronic devices. However, it is rare that there are triferroic orders and multiple types of valley polarization in a real material. Here, we propose a mechanism to realize triferroic order coexistence and multiple types of valley polarization by structural phase transition in two-dimensional (2D) materials. The 1T and 2H phase OsBr2 monolayers exhibit non-magnetic semiconductor and ferromagnetic semiconductor with valley polarization up to 175.49 meV, respectively. Interestingly, the 1T phase OsBr2 bilayer shows the tri-state valley polarization due to lattice symmetry breaking, while the valley polarization of 2H phase bilayer originates from the combined effect of time-reversal symmetry breaking and spin-orbit coupling. Furthermore, the valley polarization and ferroelectric polarization of 1T phase AB stackings and 2H phase AA stackings can be manipulated via interlayer sliding. Importantly, we have verified that the 2H phase can be transformed to 1T phase by Li+ ion intercalation, while the 2H phase can occur the structural phase transition into the 1T phase by infrared laser induction. Our work provides a feasible strategy for manipulating valley polarization and a design idea for nano-devices with nonvolatile multiferroic properties. © 2025, CC BY.

关键词： Infrared lasers

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Effects of small polarons on the high-temperature thermal radiation shielding properties of La2(Zr0.7Ce0.3)2O7/LaMnO3 composite ceramics

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Ceramics International 2025年

作者： Xu, Jiayu Xie, Min Zhang, Yonghe Song, Xiwen Wang, Zhigang Mu, Rende School of Materials Science and Engineering Inner Mongolia University of Science and Technology Inner Mongolia Baotou014010 China Inner Mongolia Key Laboratory of Advanced Ceramic Material and Devices Baotou014010 China Ministry of Education Baotou014010 China AECC Beijing Institute of Aeronautical Materials Beijing100095 China

Rare-earth zirconate ceramic materials have a high melting point, high-temperature phase stability and good application prospects in thermal barrier coatings. However, owing to the continuous improvement in the working temperature, rare-earth zirconate ceramic materials are nearly transparent to thermal radiation at high temperatures, and an increase in their thermal conductivity considerably impairs their insulation performance. In this study, considering the poor shielding effects of rare-earth zirconate ceramic materials on thermal radiation at high temperatures, LaMnO3 with small polarons was added to La2(Zr0.7Ce0.3)2O7 as an absorptive second phase to prepare La2(Zr0.7Ce0.3)2O7/LaMnO3 composite ceramics. The crystal structure, microstructure and infrared emissivity of La2(Zr0.7Ce0.3)2O7/LaMnO3 were evaluated, and the effects of La2(Zr0.7Ce0.3)2O7/LaMnO3 on the thermal conductivity of high-temperature photons were studied. The La2(Zr0.7Ce0.3)2O7/LaMnO3 composite ceramics possessed a dual-phase structure comprising pyrochlore and perovskite, demonstrating uniform grain distribution and clear grain boundaries. At high temperatures, with a gradual increase in the second-phase (LaMnO3) content, the average infrared emissivity of La2(Zr0.7Ce0.3)2O7/LaMnO3 in the wavelength range of 3–5 μm increased from 0.71 to 0.92, which reduced the impact of photon thermal conductivity on the overall thermal conductivity. To understand the high-absorption mechanism of the La2(Zr0.7Ce0.3)2O7/LaMnO3 composite ceramic materials, a LaMnO3 small-polaron-hopping model was established. A linear relationship between temperature and conductivity of LaMnO3 was established, which proved that LaMnO3 exhibited the light absorption effect of small polarons and high absorption performance for near-infrared radiations at high temperatures. © 2025

关键词： Perovskite

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Ferroelectric tuning of the valley polarized metal-semiconductor transition in Mn2P2S3Se3/Sc2CO2 van der Waals heterostructures and application to nonlinear Hall effect devices

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Physical Review Applied 2025年第3期23卷 034032-034032页

作者： Hanbo Sun Yewei Ren Chao Wu Pengqiang Dong Weixi Zhang Yin-Zhong Wu Ping Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 People’s Republic of China Department of Physics and Electronic Engineering Tongren University Tongren 554300 People’s Republic of China School of Physical Science and Technology Suzhou University of Science and Technology Suzhou 215009 People’s Republic of China State Key Laboratory for Surface Physics and Department of Physics Fudan University Shanghai 200433 People’s Republic of China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou 310027 People’s Republic of China

To promote the development of the next generation of nanospintronic devices, it is of great significance to tune the valley degree of freedom in two-dimensional (2D) materials. Here, we propose a mechanism for manipulating the valley and nonlinear Hall effect using a 2D ferroelectric substrate. Monolayer Mn2P2S3Se3 is a robust antiferromagnetic, valley polarized semiconductor. Importantly, the valley polarized metal-semiconductor phase transition of Mn2P2S3Se3 can be effectively tuned by switching the ferroelectric polarization of Sc2CO2. We reveal the microscopic mechanism of the phase transition, which originates from charge transfer and band alignment. Additionally, we find that the reversed polarization direction of Sc2CO2 can flexibly manipulate the Berry curvature dipole. Based on this discovery, we present the detection of the valley polarized metal-semiconductor transition using nonlinear Hall effect devices. These findings not only offer a scheme to tune the valley degree of freedom but also provide a promising platform for designing nonlinear Hall effect devices.

关键词： Van der Waals forces

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Hierarchical Dandelion-Like Cos2 Hollow Microspheres: Self-Assembly and Controllable Microwave Absorption Performance

SSRN

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SSRN 2023年

作者： Xu, Dongwei Zhang, Feifan Guo, Huanhuan Liu, Sitong Xiong, Xuhai Guo, Xiaoqin Chen, Ping School of Material Science and Engineering Henan Key Laboratory of Aeronautical Materials and Application Technology Zhengzhou University of Aeronautics Henan Zhengzhou450046 China Liaoning Key Laboratory of Advanced Polymer Matrix Composites Shenyang Aerospace University Shenyang110136 China State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian116024 China

The emerging electromagnetic radiation and interference problems have promoted the rapid development of microwave absorption materials (MAMs). However, it remains a severe challenge to construct high-performance microwave absorption materials with wide bandwidth, light weight and corrosion resistance. Herein, hierarchical dandelion-like CoS2 hollow microspheres are reasonably constructed via a solvothermal-hydrothermal etching-in situ vulcanization process. The structure morphology, composition and electromagnetic performance of all samples have been detailed tested. The research results demonstrate that the structure morphology of the prepared samples with a volume ratio of 1:1 between ethanol and H2O remains intact without serious damage. As MAMs,the minimum reflection loss (RLmin) value reached -47.3 dB at 3.3 mm and the maximum effective absorption bandwidth (EAB) was 9 GHz at 3.2 mm. The unparalleled multiple features including hierarchical hollow structure, tunable complex permittivity as well as the enhanced impedance matching endows CoS2 great promise as high-performance microwave absorbers for solving the problem of electromagnetic pollution. © 2023, The Authors. All rights reserved.

关键词： Self assembly

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Pa-C10: A Novel Carbon Allotrope with Distinct Two-Dimensional Conductivity and Outstanding Stretchability

SSRN

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SSRN 2024年

作者： Liu, Lingyu Ma, Mengdong Ying, Pan Hu, Meng Li, Yueqing He, Julong Zhang, Qinyong Key Laboratory of Materials and Surface Technology Ministry of Education School of Materials Science and Engineering Xihua University Sichuan Chengdu610039 China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and Technology Nanjing210094 China School of Mechanical Engineering Jiangsu University Zhenjiang212013 China Department of Mathematics and Physics Shijiazhuang Tiedao University Shijiazhuang050043 China Center for High Pressure Science State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China South China University of Technology China

Recent advancements in high-tech components have placed increasingly stringent demands on materials, often requiring them to exhibit a combination of diverse properties. Here we propose a novel layered carbon allotrope named Pa-C10. This structure consists of two graphite-like segments seamlessly stitched into a single layer via zigzag atomic chains. The stability of Pa-C10 has been rigorously validated through analyses of cohesive energy, phonon spectra, and Born criteria. Pa-C10 displays metallic characteristics, with unique two-dimensional conductive channels forming along its layers. Its distinctive crystal structure not only imparts significant strength but also endows the material with remarkable strain capacity within the plane. The ultimate tensile strains in the [100] and [010] directions are 56% and 46%, respectively, a feat achieved through the precise adjustment of the positions of the upper and lower graphite segments during deformation. These outstanding natures make Pa-C10 potential for practical applications in flexible electronic, stretchable devices, and strain-sensitive sensors. © 2024, The Authors. All rights reserved.

关键词： Graphite

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