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Tunable and improved microwave absorption of flower-like core@shell MFe_(2)O_(4)@MoS_(2)(M=Mn,Ni and Zn)nanocomposites by defect and interface engineering

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Journal of Materials Science & Technology 2023年第8期139卷 137-146页

作者： junxiong xiao xiaosi Qi Xiu Gong Qiong Peng Yanli Chen Ren Xie Wei Zhong College of Physics Guizhou Province Key Laboratory for Photoelectrics Technology and ApplicationGuizhou UniversityGuiyang 550025China National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology Nanjing UniversityNanjing 210093China

Previous results revealed that the defect and/or interface had a great impact on the electromagnetic pa-rameters of *** order to understand the main physical mechanisms and effectively utilize these strategies,in this study,M Fe_(2)O_(4)and flower-like core@shell M Fe_(2)O_(4)@MoS_(2)(M=Mn,Ni,and Zn)sam-ples with different categories were elaborately designed and selectively produced in large scale through a simple two-step hydrothermal *** conducted the systematical investigation on their microstruc-tures,electromagnetic parameters and microwave absorption performances(MAPs).The obtained results revealed that the large radius of M^(2+)cation could effectively boost the concentration of oxygen vacancy in the M Fe_(2)O_(4)and M Fe_(2)O_(4)@MoS_(2)samples,which resulted in the improvement of dielectric loss capabil-ities and ***,the introduction of MoS_(2)nanosheets greatly improved the interfacial effect and enhanced the polarization loss capabilities,which also boosted the *** taking full advantage of the defect and interface,the designed M Fe_(2)O_(4)@MoS_(2)samples displayed tunable and excellent com-prehensive MAPs including strong absorption capability,wide absorption bandwidth and thin matching ***,the clear understanding of defect and interface engineering made these strategies well elaborately designed and applicable to improving MAPs.

关键词： Core@shell structure M Fe_(2)O_(4)@MoS_(2)(M=Mn,Ni and Zn) Defect and interface engineering Improved microwave absorption properties

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Defect and interface engineering in core@shell structure hollow carbon@MoS_(2)nanocomposites for boosted microwave absorption performance

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Nano Research 2022年第9期15卷 7778-7787页

Defect and interface engineering are efficient approaches to adjust the physical and chemical properties of *** order to effectively utilize these strategies for the improvement of microwave absorption properties(MAPs),in this study,we reported the synthesis of hollow carbon shells and hollow carbon@MoS_(2)nanocomposites by the template-etching and templateetching-hydrothermal methods,*** obtained results indicated that the degree of defect for hollow carbon shells and hollow carbon@MoS_(2)could be modulated by the thickness of hollow carbon shell,which effectively fulfilled the optimization of electromagnetic parameters and improvement of ***,the microstructure investigations revealed that the precursor of hollow carbon shells was encapsulated by the sheet-like MoS_(2)in high *** the introduction of MoS_(2)nanosheets acting as the shell effectively improved the interfacial effects and boosted the polarization loss capabilities,which resulted in the improvement of comprehensive *** elaborately designed hollow carbon@MoS_(2)samples displayed very outstanding MAPs including strong absorption capabilities,broad absorption bandwidth,and thin matching ***,this work provided a viable strategy to improve the MAPs of microwave absorbers by taking full advantage of their defect and interface engineering.

关键词： core@shell structure hollow carbon shells hollow carbon@MoS_(2) defect and interface engineering improved microwave absorption properties

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Anion regulating endows core@shell structured hollow carbon spheres@MoSxSe_(2−x)with tunable and boosted microwave absorption performance

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Nano Research 2023年第4期16卷 5756-5766页

作者： junxiong xiao xiaosi Qi Lei Wang Tao Jing Jing-Liang Yang Xiu Gong Yanli Chen Yunpeng Qu Qiong Peng Wei Zhong College of Physics Guizhou Province Key Laboratory for Photoelectrics Technology and ApplicationGuizhou UniversityGuiyang 550025China National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology Nanjing UniversityNanjing 210093China National Demonstration Center for Experimental Materials Science and Engineering Education Jiangsu University of Science and TechnologyZhenjiang 212003China College of Science Kaili UniversityKaili 556011China

Due to the good manipulation of electronic structure and defect,anion regulating should be a promising strategy to regulate the electromagnetic(EM)parameters and optimize the EM wave absorption performances(EMWAPs).In this work,we proposed a facile route for the large-scale production of core@shell structured hollow carbon spheres@MoSxSe_(2−x)(x=0.2,0.6,and 1.0)multicomponent nanocomposites(MCNCs)through a mild template method followed by hydrothermal *** obtained results revealed that the designed hollow carbon spheres@MoSxSe_(2−x)MCNCs presented the improved sulfur vacancy concentration by regulating the x value from 0.2 to *** obtained hollow carbon spheres@MoSxSe_(2−x)MCNCs displayed the extraordinary comprehensive EMWAPs because of the introduced abundant defects and excellent interfacial ***,the as-prepared hollow carbon spheres@MoSxSe_(2−x)MCNCs presented the progressively improved comprehensive EMWAPs with the x value increasing from 0.2 to 1.0,which could be explained by their boosted polarization loss abilities and impedance matching characteristics originating from the enhanced sulfur vacancy ***,our findings not only demonstrated that the anion regulating was a promising method to optimize EM parameters and EMWAPs,but also provided a facile route to design the transition metal dichalcogenides-based MCNCs as the much more attractive candidates for highperformance microwave absorbers.

关键词： anion regulating core@shell structure hollow carbon spheres@MoSxSe_(2−x) interface and defect engineering microwave absorption

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Polarization-encoded neural networks with simplified grating patch

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Science China(Technological Sciences) 2025年第2期68卷 269-277页

作者： Chengyan ZHONG Xiang WANG Lingfei LI Yuanchi CUI Lei xiao Dawei SONG junxiong GUO Wen HUANG Yufeng GUO Yu LIU College of Integrated Circuit Science and Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology Nanjing 210023China College of Integrated Circuits Hangzhou Global Scientific and Technological Innovation Centre Zhejiang UniversityHangzhou 310027China Nanjing Mumusili Technology Co. LTDNanjing 211100China School of Integrated Circuits Tsinghua UniversityBeijing 100084China Institute of Advanced Study School of Electronic Information and Electrical EngineeringChengdu UniversityChengdu 610106China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Integrated Circuit Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Optical neural networks(ONNs)offer a promising solution for high-performance,energy-efficient artificial intelligence hardware by leveraging the parallelism and speed of ***,the large-scale implementation of ONNs remains challenging due to the bulky footprint and complex control of optical *** this work,we propose and simulate a plasmonic polarized synaptic architecture that overcomes the diffraction limit and enables ultra-compact *** tuning the polarization state of incident light,the optical transmittance through each plasmonic unit can be dynamically adjusted to represent a synaptic *** plasmonic structures,with features as small as 40 nm,operate well below this limit in the visible spectrum(400-750 nm).Compared with diffraction and interference-based circuit designs,our proposed method achieves a substantial reduction in synaptic density by factors of 150000-fold and 1500-fold,***,we successfully demonstrate a proof-of-concept plasmonic ONN applied to the Canadian Institute for Advanced Research—10 classes(CIFAR-10)dataset using a Visual Geometry Group network with 16 layers(VGG16)*** training for 80 epochs,the network achieves an accuracy of 93%.The polarization-tunable plasmonics paves the way towards scalable ONNs for next-generation artificial intelligence(AI)accelerators and smart sensors.

关键词： optical neural networks polarization dependent nanophotonic ultra-compact devices diffraction limit

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基于幅度比值的低复杂度频偏估计算法

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光学学报 2015年第5期35卷 104-109页

作者：冯婕肖骏雄韩纪龙李蔚胡荣杨奇余少华华中科技大学武汉光电国家实验室湖北武汉430074 武汉邮电科学研究院光纤通信技术和网络国家重点实验室湖北武汉430074

针对在任意阶正交幅度调制(M-QAM)的相干光通信系统中发射激光器与本振激光器之间存在频率偏差的问题,提出了一种基于幅度比值的低复杂度频偏估计算法。该算法先对接收信号做快速傅里叶变换(FFT),再利用所获得的离散谱中主峰值与次峰值... 详细信息

针对在任意阶正交幅度调制(M-QAM)的相干光通信系统中发射激光器与本振激光器之间存在频率偏差的问题,提出了一种基于幅度比值的低复杂度频偏估计算法。该算法先对接收信号做快速傅里叶变换(FFT),再利用所获得的离散谱中主峰值与次峰值的关系进行频率插值,从而对频偏进行精确估计,大幅减少了运算复杂度。仿真了算法在20 Gbaud 16QAM的单偏振传输系统中的性能,并与梯度下降法(GD)和调频Z变换(CZT)的频偏估计算法进行了对比,仿真结果显示,基于幅度比值的频偏估计算法性能不随被估计信号的频率分布而产生波动,而且与3次迭代的GD算法和CZT算法精度相当,但硬件复杂度降低了约75%。

关键词：光通信载波频率估计相干检测数字信号处理正交幅度调制

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Polarization-encoded neural networks with simplified grating patch

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Science China Technological Sciences 2025年第2期 273-281页

作者： Chengyan ZHONG Xiang WANG Lingfei LI Yuanchi CUI Lei xiao Dawei SONG junxiong GUO Wen HUANG Yufeng GUO Yu LIU College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology College of Integrated Circuits Hangzhou Global Scientific and Technological Innovation Centre Zhejiang University Nanjing Mumusili Technology Co. LTD School of Integrated Circuits Tsinghua University Institute of Advanced Study School of Electronic Information and Electrical Engineering Chengdu University State Key Laboratory of Electronic Thin Films and Integrated Devices School of Integrated Circuit Science and EngineeringUniversity of Electronic Science and Technology of China

Optical neural networks(ONNs) offer a promising solution for high-performance, energy-efficient artificial intelligence hardware by leveraging the parallelism and speed of light. However, the large-scale implementation of ONNs remains challenging due to the bulky footprint and complex control of optical synapses. In this work, we propose and simulate a plasmonic polarized synaptic architecture that overcomes the diffraction limit and enables ultra-compact ONNs. By tuning the polarization state of incident light, the optical transmittance through each plasmonic unit can be dynamically adjusted to represent a synaptic weight. Our plasmonic structures, with features as small as 40 nm, operate well below this limit in the visible spectrum(400–750 nm). Compared with diffraction and interference-based circuit designs, our proposed method achieves a substantial reduction in synaptic density by factors of 150000-fold and 1500-fold, respectively. Furthermore, we successfully demonstrate a proof-of-concept plasmonic ONN applied to the Canadian Institute for Advanced Research—10classes(CIFAR-10) dataset using a Visual Geometry Group network with 16 layers(VGG16) model. After training for 80epochs, the network achieves an accuracy of 93%. The polarization-tunable plasmonics paves the way towards scalable ONNs for next-generation artificial intelligence(AI) accelerators and smart sensors.

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Microdamage study of granite under thermomechanical coupling based on the particle flow code

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Frontiers of Structural and Civil Engineering 2023年第9期17卷 1413-1427页

作者： Chong SHI Yiping ZHANG Yulong ZHANG xiao CHEN junxiong YANG Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil EngineeringNortheastern UniversityShenyang 110819China Department of Civil and Mineral Engineering University of TorontoToronto M5S1A1Canada

The thermomechanical coupling of rocks refers to the interaction between the mechanical and thermodynamic behaviors of rocks induced by temperature *** study of this coupling interaction is essential for understanding the mechanical and thermodynamic properties of the surrounding rocks in underground *** this study,an improved temperature-dependent linear parallel bond model is introduced under the framework of a particle flow simulation.A series of numerical thermomechanical coupling tests are then conducted to calibrate the micro-parameters of the proposed model by considering the mechanical behavior of the rock under different thermomechanical *** agreement between the numerical results and experimental data are obtained,particularly in terms of the compression,tension,and elastic responses of *** this improved model,the thermodynamic response and underlying cracking behavior of a deep-buried tunnel under different thermal loading conditions are investigated and discussed in detail.

关键词： thermomechanical coupling effect granite improved linear parallel bond model thermal property particle flow code

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Feature extraction of jujube fruit wrinkle based on the watershed segmentation

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International Journal of Agricultural and Biological Engineering 2017年第4期10卷 165-172页

作者： Zhang junxiong Ma Qingqing Li Wei xiao Tingting College of Engineering China Agricultural UniversityBeijing 100083China

The degree of surface wrinkles on a dried jujube fruit(Ziziphus jujuba Mill.)is an important quality grading *** aim of this research was to propose an image processing method based on the watershed segmentation to extract the wrinkle features of jujube *** images of jujube fruit taken under cyan light were transformed into grayscale *** noise in these images was then removed by morphological *** H-minima extended transformation was used to label the foreground of jujube fruit images after reconstruction,and the labeled foreground regions were segmented by a distance transform-based watershed ***,the grayscale images were filtered with a local range *** segmentation function was obtained using the minima imposition ***,a watershed segmentation was used to extract the wrinkle features of jujube *** on 304 images of jujube fruit showed that the accuracy of wrinkle-based grading obtained by the algorithm was 92.11%,which proved that this method could be used to classify jujube wrinkles.

关键词： feature extraction watershed segmentation image processing jujube fruit wrinkle quality grading

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Electrospinning Engineering Enables High‑Performance Sodium‑Ion Batteries

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Advanced Fiber Materials 2022年第1期4卷 43-65页

作者： Chuanping Li Min Qiu Ruiling Li Xuan Li Manxi Wang Jiabo He Ganggang Lin Liren xiao Qingrong Qian Qinghua Chen junxiong Wu xiaoyan Li Yiu‑Wing Mai Yuming Chen College of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350000FujianChina College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350000China State Grid Fujian Maintenance Company Fuzhou 350000FujianChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronics Engineering J07The University of SydneySydneyNSW 2006Australia

As a promising energy storage device,sodium-ion batteries(SIBs)have received continuous attention due to their low-cost and environmental ***,the sluggish kinetics of Na ion usually makes SIBs hard to realize desirable electrochemical performance when compared to lithium-ion batteries(LIBs).The key to addressing this issue is to build up nanostructured materials which enable fast Na-ion insertion/***-dimensional(1D)nanocarbons have been considered as both the anode and the matrix to support active materials for SIB electrodes owing to their high electronic conductivity and excellent mechanical *** of their large surface areas and short ion/electron difusion path,the synthesized electrodes can show good rate performance and cyclic stability during the charge/discharge *** is a simple synthetic technology,featuring inexpensiveness,easy operation and scalable production,and has been largely used to fabricate 1D nanostructured *** this review,we frst give a simple description of the electrospinning principle and its capability to construct desired nanostructures with diferent ***,we discuss recent developments of carbon-based hybrids with desired structural and compositional characteristics as the electrodes by electrospinning engineering for ***,we identify future research directions to realize more breakthroughs on electrospun electrodes for SIBs.

关键词： Sodium-ion batteries Electrospinning engineering Carbonaceous substrate Hybrid

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不同轮作措施对黔西南州烟区土壤碳/氮养分的空间变异特征

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贵州农业科学 2018年第8期46卷 55-58页

作者：胡岗秦松王文华苟久兰石俊雄肖厚军范成五张邦喜贵州省农业科学院土壤肥料研究所/农业资源与环境研究所贵州贵阳550006 贵州省烟草科学研究院贵州贵阳556000

为黔西南州烟区土壤质量维护及烤烟生产的合理施肥提供依据,采用野外布点采样,利用GIS技术分析方法定量研究烟区土壤有机碳/氮素的空间异质性及分布特征。结果表明:黔西南州烟区表层土壤有机碳平均含量为20.84～23.88g/kg,平均为22.36g/... 详细信息

为黔西南州烟区土壤质量维护及烤烟生产的合理施肥提供依据,采用野外布点采样,利用GIS技术分析方法定量研究烟区土壤有机碳/氮素的空间异质性及分布特征。结果表明:黔西南州烟区表层土壤有机碳平均含量为20.84～23.88g/kg,平均为22.36g/kg,变异系数为32.70%。全氮与速效氮分别为1.65～20.3g/kg和120.97～160.45mg/kg,平均为1.89g/kg和139.02mg/kg,变异系数为31.06%和46.26%,属中等强度的空间变异性;土壤有机碳、碳氮比指数的空间分布规律类似,空间分布总体呈较均匀趋势。全氮和pH的空间分布规律类似,表现为北低南高;速效氮的空间分布规律不明显。在生产过程中,应针对不同烟区的土壤养分状况因地制宜、分类指导,采用不同的烤烟专用复合肥配方,提高烟区土壤的养分均衡供应能力。

关键词：烟区土壤空间分布有机碳氮素碳氮比黔西南贵州

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