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An Efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron Nitride Nanotubes

Nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai Zhang Liping ding Liyun Wu Songfeng E Qian He Nanyang Wang Hui Zuo Zhengyang Zhou feng ding Yue Hu Jin Zhang Yagang Yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BNNTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BNNTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with N atoms to form BN *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BNNTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation Density functional theory

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A Family of Non-quasiprimitive Graphs Constructed From PSU_3(q) Where q Is Odd

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Acta Mathematica Sinica,English Series 2008年第7期24卷 1155-1162页

作者： Shi feng ding Department of Mathematics Central South University Changsha 410075 P. R. China

Let Г be a simple connected graph and let G be a group of automorphisms of Г. Г is said to be （G, 2）-arc transitive if G is transitive on the 2-arcs of Г. It has been shown that there exists a family of non-quasiprimitive （PSU3（q）, 2）-arc transitive graphs where q = 2^3m with m an odd integer. In this paper we investigate the case where q is an odd prime power.

关键词： graph 2-arc transitive PSU3(q)

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Structural and Magnetic Properties of Bi（Fe1-xMnx）O3

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Chinese Journal of Chemical Physics 2012年第2期25卷 204-208,I0004页

作者： Bin-feng ding Department of Physics and Electronic Information Langfang Teachers CollegeLangfang 065000China

Bi（Fe1-xMnx）O3 bulk ceramics with Mn concentration x up to 0.3 were prepared by rapid sintering using sol-gel derived fine powders. Structure transformation is found to depend on the Mn doping concentration by X-ray diffraction and Raman spectroscopy. Bi（Fe1-xMnx）O3 maintains the rhombohedral structure of BiFeO3 with x=0.05 and 0.1, but changes to the orthorhombic structure with x=0.3. Weak ferromagnetism is observed for Bi（Fe1-xMnx）O3 with x=0.05 and 0.1, but stronger paramagnetism is observed for Bi（Fe1-xMnx）O3 with x=0.3 indicating a magnetic phase change from antiferromagnetic to paramagnetic with the structure changing from R3c to C222. Two anomalies at 30 and 140 K are observed for Bi（Fe1-xMnx）O3 with x=0.05 and 0.1. The anomaly at 30 K is concluded to be related to the freezing of cluster spin glass from dc magnetic memory and relaxation measurements.

关键词： Multiferroic Spin glass Ferromagnetism Cluster

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Parameter estimation for multirate multi-input systems using auxiliary model and multi-innovation

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Journal of Systems Engineering and Electronics 2010年第6期21卷 1079-1083页

作者： Lili Han feng ding School of IoT Engineering Jiangnan University Wuxi 214122 E R. China

The multirate multi-input systems have different updating periods and sampling periods such that the conventional identification algorithms cannot be used to identify such multirate systems. By using the auxiliary model identification idea, the multiinnovation stochastic gradient algorithm is developed to estimate the parameters of multirate systems. Finally, an illustrative example is given to verify the effectiveness of the proposed algorithm.

关键词： parameter estimation multirate systems multiinnovation auxiliary model.

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Data-driven optimal cooperative adaptive cruise control of heterogeneous vehicle platoons with unknown dynamics

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Science China(Information Sciences) 2020年第9期63卷 109-120页

作者： Xiulan SONG feng ding feng XIAO Defeng HE College of Information Engineering Zhejiang University of Technology

This paper considers the cooperative adaptive cruise control(CACC) problem of heterogeneous vehicle platoons and proposes a data-driven optimal CACC approach for the heterogeneous platoon with unknown dynamics. To cope with the unknown dynamics of the vehicle CACC platoon system, the adaptive dynamic programming is used to design an online iteration policy for optimal CACC of the platoon. Using the predecessor-following topology, the CACC controllers are computed by employing the desired spacing errors, relative velocities, and accelerations of the vehicles. The stability of the closed-loop CACC system and the iteration algorithm are presented. Furthermore, the string stability of the platoon with the CACC system is established in terms of the acceleration transfer function between adjacent vehicles in frequent domain. Finally, the effectiveness of the proposed method is verified in two complex scenarios of varying speed cruise.

关键词： vehicle platoons cooperative adaptive cruise control optimal control data-driven control string stability

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Characterization of a ZnO Epilayer Grown on Sapphire by using Rutherford Backscattering/Channeling and X-Ray Diffraction

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Chinese Physics Letters 2012年第3期29卷 239-242页

作者： ding Bin-feng Department of Physics and Electronic Information Langfang Teachers CollegeLangfang 065000

A ZnO layer with rather good crystalline quality(Xmin=9.4%)is grown on a sapphire substrate by plasma enhanced chemical vapor deposition(PECVD).Rutherford backscattering(RBS)/channeling and high-resolution x-ray diffraction(XRD)are used to characterize the elastic strain in the ZnO *** tetragonal distortion is positive and depth *** is highest near the interface and decreases towards the sample *** combining the results of RBS and XRD,the average elastic strains in the parallel and the perpendicular directions can be calculated to be 0.50%and-0.17%,respectively.

关键词： sapphire surface layer

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Robust Centralized CFAR Detection for Multistatic Sonar Systems

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Chinese Journal of Electronics 2021年第2期30卷 322-330页

作者： LU Shuping ding feng LI Ranwei Hangzhou Applied Acoustic Research Institute

This paper proposes a novel centralized Constant false alarm ratio(CFAR) detector for multistatic sonar systems. The detector employs the idea of Variability index(VI) CFAR detection, to adaptively select the matched detection algorithm in diversified undersea environments. All the echo data from mutistatic sonar receivers are transmitted into the centralized fusion center. Firstly, the background statistics of reference cells from different nodes are analyzed. Then choose one appropriate centralized detection algorithm according to the background statistics, which refers to the centralized Cell averaging CFAR(CA-CFAR), greatest of CFAR, order statistic CFAR detection *** performance of the proposed detector is analyzed by computer simulation and measured sonar data. The results show that, compared to the centralized CA-CFAR detector, the introduced centralized detector achieves a better robustness in multiply heterogeneous undersea environments.

关键词： appropriate centralized detection algorithm order statistic CFAR detection algorithms matched detection algorithm robust centralized CFAR detection diversified undersea environments mutistatic sonar receivers measured sonar data centralized Cell averaging CFAR multiply heterogeneous undersea environments echo data centralized CA-CFAR detector signal detection radar detection reference cells introduced centralized detector radar clutter multistatic sonar systems statistical analysis Variability index CFAR detection sensor fusion background statistics Constant false alarm ratio detector centralized fusion center object detection target tracking

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An approach to estimate tree height using PolInSAR data constructed by the Sentinel-1 dual-pol SAR data and RVoG model

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Journal of Electronic Science and Technology 2024年第3期22卷 69-79页

作者： Yin Zhang ding-feng Duan School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu611731China

We estimate tree heights using polarimetric interferometric synthetic aperture radar(PolInSAR)data constructed by the dual-polarization(dual-pol)SAR data and random volume over the ground(RVoG)*** the Sentinel-1 SAR dual-pol(SVV,vertically transmitted and vertically received and SVH,vertically transmitted and horizontally received)configuration,one notes that S_(HH),the horizontally transmitted and horizontally received scattering element,is *** S_(HH)data were constructed using the SVH data,and polarimetric SAR(PolSAR)data were *** proposed approach was first verified in simulation with satisfactory *** was next applied to construct PolInSAR data by a pair of dual-pol Sentinel-1A data at Duke Forest,North Carolina,*** to local observations and forest descriptions,the range of estimated tree heights was overall *** the heights with the ICESat-2 tree heights at 23 sampling locations,relative errors of 5 points were within±30%.Errors of 8 points ranged from 30%to 40%,but errors of the remaining 10 points were>40%.The results should be encouraged as error reduction is *** instance,the construction of PolSAR data should not be limited to using SVH,and a combination of SVH and SVV should be ***,an ensemble of tree heights derived from multiple PolInSAR data can be considered since tree heights do not vary much with time frame in months or one season.

关键词： Constructed polarimetric SAR data Dual polarization Sentinel-1 SAR data Polarimetric interferometric SAR Random volume over the ground model Tree height estimation

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Stability Analysis of Distributed Parameter Systems on Temperature Measurement of Large-scale Objects

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Journal of Thermal Science 2007年第3期16卷 248-253页

作者： Zhenliang ding Li ZHONG feng YUAN Department of Electronic Engineering School of Automatic Measurement and Control Harbin Institute of Technology 150001 Harbin China

In this paper, the mechanical construction, thermal regulator design and temperature measurement system of a local area were set up for large-scale linear measurement. Numerical analysis based on temperature correlated characteristic is discussed to obtain optimal observation points for the measurements. The horizontal temperature distribution of the measured area is compared with the measurement of the variation of temperature at 15℃ and 20℃ over time, and characteristic of dynamic response is also discussed. In addition, the long-time stability of measured temperature is analyzed by means of using the standard deviation. It characterizes the temperature distribution performance of a large area and how it may impact the measurement of a large-scale object.

关键词： temperature control temperature measurement distribution parameter linear measurement.

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Mechanisms of the epitaxial growth of two-dimensional polycrystals

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npj Computational Materials 2022年第1期8卷 1016-1026页

作者： Jichen Dong Yunqi Liu feng ding Centre for Multidimensional Carbon Materials Institute for Basic ScienceUlsan44919Korea Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China School of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan44919Korea

In the epitaxial growth of two-dimensional(2D)materials on substrates,2D polycrystals with various shapes have been broadly observed,but their formation mechanisms are still highly *** we present a complete study on the formation mechanisms of various 2D *** structures of the 2D polycrystals are dependent on the symmetries of both the 2D material and the *** build four complete libraries of 2D polycrystals for(i)threefold symmetric 2D materials on two-or six-fold symmetric substrates(i.e.,family-Ⅲ/Ⅱor-Ⅲ/Ⅵ),(ii)threefold symmetric 2D materials on fourfold symmetric substrates(***-Ⅲ/Ⅳ),(iii)fourfold symmetric 2D materials on three-or six-fold symmetric substrates(i.e.,family-Ⅳ/Ⅲor-Ⅳ/Ⅵ),and(iv)sixfold symmetric 2D materials on fourfold symmetric substrates(i.e.,family-Ⅵ/Ⅳ),*** four libraries of 2D polycrystals are consistent with many existing experimental observations and can be used to guide the experimental synthesis of various 2D polycrystals.

关键词： symmetric polycrystals epitaxial

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