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Design of NV color center fluorescence signal acquisition circuit based on FPGA architecture

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Optoelectronics Letters 2024年第12期20卷 721-727页

作者： ZENG sen YANG Shuqiang LIU Jingyan ZHAO Chuang shang Zhengguo HE Xianming Key Laboratory of Optoelectronic Technology and Systems Ministry of Education of ChinaChongqing UniversityChongqing 400044China College of Physics and Electronics Information Luoyang Normal UniversityLuoyang 471934China School of Electrical Engineering Chongqing University of Science and TechnologyChongqing 401331China

Nitrogen-vacancy(NV)quantum defects in diamond are sensitive detectors of magnetic *** rapid development of NV-center magnetic sensor has higher requirements for high-speed and high-precision data acquisition,weak signal detection and ***,the existing sensing technologies based on diamond NV centers rely on bulky and expensive instruments,which must be replaced by a more compact *** we combine NV quantum sensing technology with integrated circuit technology to create a compact and easy-to-operate platform,which includes microwave source module,transistor-transistor logic(TTL)modulation module,digital lock-in amplifier(DLIA)module,*** order to confirm the reliability of the experimental platform,we not only tested the performance of each individual module,but also carried out optical detection magnetic resonance(ODMR)*** this platform,we can obtain a magnetic sensitivity of 465 nT/Hz^(1/2).This experimental platform with convenient operation and low noise has the potential to become an independent magnetic measuring instrument.

关键词： center centers fir

How is Systemic Risk Amplified by Three Typical Financial Networks

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Journal of the Operations Research Society of China 2022年第3期10卷 579-598页

作者： Jia-Li Ma Shu-shang Zhu xiao-Chuan Pang College of Big Data Statistics Guizhou University of Finance and EconomicsGuiyang550025GuiZhouChina School of Business Sun Yat-Sen UniversityGuangzhou510275GuangdongChina

Financial institutions are typically tied together via inter-liability,portfolio overlapping and share *** connections among financial institutions constitute the three most common financial networks,which may lead to financial risk contagion and even systemic risk when some institutions suffer *** this paper,firstly,for a given shock,we prove the existence of the equilibrium clearing vector of the financial system characterized by these three typical financial ***,we mathematically derive an analytical form to show how these three contagion channels jointly affect and amplify the loss of the non-default institutions,and explain how the lack of liquidity of external investment assets exacerbates the loss caused by portfolio ***,the influence of the characteristics of financial network on risk contagion is verified by numerical *** results provide basis for understanding the financial systemic risk contagion in the real world.

关键词： Systemic risk Inter-liability Share cross-holding Portfolio overlapping Contagion

A UAV-Assisted V2X Network Architecture with Separated Data Transmission and Network Control

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China Communications 2023年第6期20卷 260-276页

作者： xiao Ma Liang Wang Weijia Han Xijun Wang Tingting shang School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119China School of Computer Science Shaanxi Normal UniversityXi’an 710119China School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510006China The Technical Quality Department of Hangzhou Hollysys Automation Co. Ltd.Xi’an BranchXi’an 710077China

With the explosive increasing number of connecting devices such as smart phones, vehicles,drones, and satellites in the wireless networks, how to manage and control such a huge number of networking nodes has become a great challenge. In this paper, we combine the advantages of centralized networks and distributed networks approaches for vehicular networks with the aid of Unmanned Aerial Vehicle(UAV), and propose a Center-controlled Multihop Wireless(CMW) networking scheme consisting of data transmission plane performed by vehicles and the network control plane implemented by the ***, we jointly explore the advantages of Medium Access Control(MAC) protocols in the link layer and routing schemes in the network layer to facilitate the multi-hop data transmission for the ground ***, the network control plane in the UAV can manage the whole network effectively via fully exploiting the acquired network topology information and traffic requests from each vehicle, and implements various kinds of control based on different traffic demands, which can enhance the networking flexibility and scalability significantly in vehicular *** results validate the advantages of the proposed scheme compared with existing methods.

关键词： V2X networks centralized network control network architecture UAV routing algorithm

Bayesian machine learning-based method for prediction of slope failure time

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1188-1199页

作者： Jie Zhang Zipeng Wang Jinzheng Hu Shihao xiao Wenyu shang Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education Tongji UniversityShanghai200092China Department of Geotechnical Engineering Tongji UniversityShanghai200092China Natural Science College Michigan State UniversityMI48825USA

The data-driven phenomenological models based on deformation measurements have been widely utilized to predict the slope failure time(SFT).The observational and model uncertainties could lead the predicted SFT calculated from the phenomenological models to deviate from the actual ***,very limited study has been conducted on how to evaluate the effect of such uncertainties on SFT *** this paper,a comprehensive slope failure database was compiled.A Bayesian machine learning(BML)-based method was developed to learn the model and observational uncertainties involved in SFT prediction,through which the probabilistic distribution of the SFT can be *** method was illustrated in detail with an *** studies show that the BML-based method is superior to the traditional inverse velocity method(INVM)and the maximum likelihood method for predicting *** proposed method in this study provides an effective tool for SFT prediction.

关键词： Slope failure time(SFT) Bayesian machine learning(BML) Inverse velocity method(INVM)

A forced ignition probability analysis method using kernel formation analysis with turbulent transport and Lagrangian flame particle tracking

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Chinese Journal of Aeronautics 2021年第4期34卷 403-415页

作者： Qing XIE Zhuyin REN Ke WANG Hongjun LIN Shoutang shang Wei xiao School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Institute for Aero Engine Tsinghua UniversityBeijing 100084China Aero Engine Academy of China Beijing 101300China AECC Shenyang Engine Research Institute Shenyang 110000China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412000China

A forced ignition probability analysis method is developed for turbulent combustion,in which kernel formation is analyzed with local kernel formation criteria,and flame propagation and stabilization are simulated with Lagrangian flame particle *** kernel formation,the effect of turbulent scalar transport on flammability is modelled through the incorporation of turbulenceinduced diffusion in a spherically outwardly propagating flame kernel *** dependence of flammability limits on turbulent intensities is tabulated and serves as the flammability criterion for kernel *** Lagrangian flame particle tracking,flame particles are tracked in a structured grid with flow fields being interpolated from a Computational Fluid Dynamics(CFD)*** particle velocity follows a Langevin model consisting of a linear drift and an isotropic diffusion *** Karlovitz number is employed for the extinction criterion,which compares chemical and turbulent *** integration of the above two-step analysis approach with non-reacting CFD is achieved through a general interpolation interface suitable for general unstructured CFD *** method is demonstrated for a methane/air bluff-body flame,in which flow and fuel/air mixing characteristics are extracted from a non-reacting *** show that the computed ignition probability map agrees qualitatively with experimental results.A reduction of the ignition probability in the recirculation zone and a high ignition probability on the shear layer of the recirculation zone near the mean stoichiometric surface are well *** tools can facilitate optimization of spark placement and offer insights into ignition processes.

关键词： Bluff-body stabilized flame Igniting process Ignition criterion Ignition probability Lagrangian particle tracking

One-step solution combustion synthesis of micro-nano-scale porous Cu/CeO_(2)with enhanced photocatalytic properties

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Journal of Rare Earths 2023年第2期41卷 250-258页

作者： Zhichao shang Yong Yu Hang Yang Zhongxiang Yang Yang xiao xiaohong Wang School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN47907-2100USA

The Cu/CeO_(2)nanoporous composite material was prepared via a one-step and energy-saving method of solution combustion synthesis(SCS).The phase composition,surface morphology and optical characteristics of Cu/CeO_(2)were *** results show that the SCS products are composed of cubic fluorite CeO_(2)and *** to the generation and escape of gas during the synthetic reaction,the SCS CeO_(2)shows porous structure,in which the mesopores(diameter 10-17 nm)nest in the wall of large pores(diameter80-300 nm).X-ray photoelectron spectroscopy(XPS)outcomes indicate that the oxygen vacancy concentration of CeO_(2)increases(18.97%-30.93%)with the increase of Cu *** decoration of Cu greatly enhances the catalytic activity of CeO_(2)nanomaterials.30 wt%Cu/CeO_(2)composite material shows the best photocatalytic activities for the degradation of methyl orange(MO)(95.99%),which is about 4.3times that of CeO_(2)at the same time(120 min).UV-vis diffuse reflectance spectroscopy(DRS)results show that the semiconductor band gap is reduced with the addition of metallic Cu,which leads to the enhancement of photocatalytic *** free radical trapping experiments demonstrate that·O_(2)-and h+are the main active species in the photocatalytic degradation of *** on the above results,a hypothesized mechanism for enhanced photocatalysis of Cu/CeO_(2)nanomaterials was proposed:the porous structure provides more reactive sites and channels for mass transfer,and the presence of metallic Cu improves the oxygen vacancy concentration of CeO_(2)and then promotes charge-carrier separation,which helps enhance the photocatalytic performance of Cu/CeO_(2).

关键词： Solution combustion synthesis Cu/CeO_(2) Nanoporous material Photocatalyst Rare earths

Intrinsically asymmetric atomic character regulates piezoelectricity in two-dimensional materials

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Frontiers of physics 2024年第3期19卷 153-162页

作者： Yun-Qin Li Qi-Wen He Dai-Song Tang xiao shang xiao-Chun Wang School of Physics Science and Information Technology Liaocheng UniversityLiaocheng 252000China Key Laboratory of Polar Materials and Devices Ministry of EducationDepartment of ElectronicsEast China Normal UniversityShanghai 200241China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

Decreasing of layer thickness causes the decrease of polarization until it disappears due to the existence of depolarization ***,the search for strong piezoelectric materials is highly desirable for multifunctional ultra-thin piezoelectric ***,we propose a common strategy for achieving strong piezoelectric materials through the electronic asymmetry induced by the intrinsically asymmetric atomic character of different chalcogen ***,in the tetrahedral lattice structures,for example,M4X3Y3(M=Pd/Ni,X/Y=S,Se or Te,X≠Y)monolayers are proved to display excellent out-of-plane ***4Se3Te3 possesses the largest piezoelectric coefficient d33 of 61.57 pm/V,which is much larger than that of most 2D *** the electronic asymmetry further increases the out-of-plane piezoelectricity of Janus M4X3Y3 ***,the out-of-plane piezoelectricity is positively correlated with the ratio of electronegativity difference(Red)and the electric dipole moment(P).This work provides alternative materials for energy harvesting nano-devices or self-energized wearable devices,and supplies a valuable guideline for predicting 2D materials with strong out-of-plane piezoelectricity.

关键词： piezoelectricity intrinsically asymmetric atomic character ratio of electronegativity difference electric dipole moment first-principles calculations

Defect-Tolerant Mapping of CMOL Circuit Targeting Delay Optimization

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Journal of Computer Science & Technology 2021年第5期36卷 1118-1132页

作者： xiao-Jing Zha Yin-Shui Xia shang-Luan Xie Zhu-Fei Chu Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingbo 315211China

In view of the significant number of defective nanodevices in the Cmos/nanowire/MOLecular hybrid(CMOL)circuit,defect-tolerant mapping is an essential step to achieve correct logic operations in defective CMOL ***,less effort has been made to improve circuit delay by defect-tolerant *** this paper,the factors affecting the delay of mapped circuits are analyzed,and the path-tree based defect-tolerant mapping method for the delay optimization is *** the logic-domain,the terminology of the path tree is presented,and the logic circuit is first partitioned into multiple path ***,the mapping areas in the physic-domain are pre-planned for(near)critical path *** the mapping process,the specific mapping modes and an updating strategy are formulated to map the path trees:inputs are mapped based on input sorting;(near)critical path trees are mapped with priority,while the others are mapped in a hierarchical ***,an improved tabu search algorithm is employed to verify the validity of the proposed defect-tolerant mapping *** evaluations on the ISCAS benchmarks show that the proposed method can reduce circuit delay by 15.22%.

关键词： nanohybrid circuit defect-tolerant mapping delay optimization

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基于视频游戏的空间能力测评

心理科学进展 2025年第1期33卷 11-24页

作者：尚俊杰石祝沈科杰北京大学教育学院学习科学实验室北京100871

空间能力是个体对客体或空间图形在头脑中进行识别、编码、贮存、表征、分解组合和抽象概括的能力,是个体理解自身所处环境并解决问题的认知基础。准确、便捷、有效地测评空间能力,对增强STEM教育教学水平和人才培养质量都具有重要意义... 详细信息

空间能力是个体对客体或空间图形在头脑中进行识别、编码、贮存、表征、分解组合和抽象概括的能力,是个体理解自身所处环境并解决问题的认知基础。准确、便捷、有效地测评空间能力,对增强STEM教育教学水平和人才培养质量都具有重要意义。由于空间能力受多因素共同作用,具有复杂性、多维度、内隐性的特点,使得利用计算机评价空间能力比较困难。本研究旨在准确、有效、大规模地测评空间能力,将使用多模态学习分析方法探索学习者空间认知行为表现特征,并基于视频游戏环境研发空间能力隐形测评关键技术与工具。具体包括:1)构建空间能力内在表征框架和评价指标体系;2)基于多模态学习分析构建学习者空间能力行为表现模型;3)探索视频游戏影响空间能力的关键因素,并使用游戏引擎开发基于视频游戏的测评工具;4)使用以证据为中心的设计框架和贝叶斯网络模型,开发并部署能够推断和预测空间能力的测评算法;5)在实验室和真实课堂情境开展实证研究,验证测评工具有效性。研究成果将有利于理解人类空间认知过程和行为表现,拓展和丰富空间能力相关理论,并为大规模数字化测评提供关键技术支撑。

关键词：基于游戏的测评空间能力多模态学习分析游戏化学习隐形测评

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