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Prediction of Superhard BN_(2) with High Energy Density

Chinese physics Letters 2021年第1期38卷 125-130页

作者： Yiming Zhang Shuyi Lin Min Zou Meixu Liu Meiling Xu Pengfei Shen Jian Hao Yinwei Li Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China

Considering that pressure-induced formation of short,strong covalent bonds in light-element compounds can produce superhard materials,we employ structure searching and first-principles calculations to predict a new class of boron nitrides with a stoichiometry of BN_(2),which are stable relative to alpha-B and alpha-N_(2) at ambient *** ambient pressure,the most stable phase has a layered structure(h-BN_(2)) containing hexagonal BN layers between which there are intercalated N_(2) *** 25 GPa,a three-dimensional P4_(2)/mmc structure with single N-N bonds becomes the most ***,thermal,and mechanical stability calculations reveal that this structure can be recovered under ambient *** calculated stress-strain relations demonstrate an intrinsic superhard nature with an estimated Vickers hardness of ~43 *** structure has a potentially high energy density of ~4.19 kJ/g.

关键词： ambient structure hexagonal

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The validation of the elderly pelvic FE model and comparison with the pelvis models of children and adults

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International Journal of Vehicle Safety 2021年第1期12卷 66-80页

作者： Wu, Hequan Deng, Xiaoshun Qian, Xiaoyan Zhan, Xuehui Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Changsha Hunan410004 China Wayne State University DetroitMI48201 United States Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Hunan Changsha410004 China School of Physics and Electronic Science Changsha University of Science and Technology Hunan Changsha410004 China

For studying the pelvic injury mechanism and the difference among different age groups in the car crash, elderly pelvic model was developed and validated in this paper. The elderly pelvis model was compared with the young people’s pelvis model and the children’s pelvis model. The results show that the physiological and geometric size of pelvic model of elderly is similar to that of young people, but both of them are quite different from the children’s. Compared with the other two models, the elderly pelvic model has the strongest response of peak force and Dforce (deflection at maximum force), but the weakest response of maximum deflection under different impact velocities from 4 m/s to 15 m/s. The peak force and Dmax increased exponentially and linearly with the impact energy in all three models, respectively. The most vulnerable parts of the injury were the ischio-pubic rami, iliac-sacral junction and acetabulum area. Copyright © 2021 Inderscience Enterprises Ltd.

关键词： Physiological models

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Research on Fault Diagnosis and Detection of On-Line Monitoring Equipment Based on Internet of Things

Research on Fault Diagnosis and Detection of On-Line Monitor...

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作者： Lu, Guiping Liang, Jiaran Shentu, Zeyu Wu, Wenxiong He, Minghao Xiao, Zhiyong Li, Jianke Beijing Institute of Technology Zhuhai Zhuhai Guangdong519088 China The Fifth Electronics Research Institute of Ministry of Industry and Information Technology Science and Technology on Reliability Physics and Application of Electronic Component Laboratory Guangzhou Guangdong510610 China

In order to quickly and accurately identify one of the many equipment that has stopped working or a working environment has changed due to errors. A method based on the Internet of things online monitoring equipment is designed to observe whether equipment is working normally. Through the design of an intelligent collection card with a variety of sensors, information will be collected and transmitted to a collection server, and finally uploaded to a cloud, so that experimental conditions can be traced back to whether experimental conditions have been artificially changed or whether equipment has been not operated properly. Through the data analysis of a software operation platform, the current status of electrical safety testing equipment and the results of testing data can be monitored online, and then the fault of electrical safety equipment can be diagnosed. That is, the real-time monitoring and fault diagnosis of electrical safety equipment and the unified management of on-line equipment. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Failure analysis

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Diagnosing quantum phases using long-range two-site quantum resource behavior

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Physical Review B 2024年第10期110卷 104101页

作者： Lin-Lin Su Jun Ren Wen-Long Ma Z. D. Wang Yan-Kui Bai College of Physics and Hebei Key Laboratory of Photophysics Research and Application State Key Laboratory of Superlattices and Microstructures Department of Physics HK Institute of Quantum Science & Technology and Guangdong-Hong Kong Joint Laboratory of Quantum Matter The Center of Materials Science and Opto-Electronic Technology 3 Binlang Road Shenzhen 518045 China

We propose and demonstrate that the behaviors of long-range, two-site quantum resources can effectively diagnose quantum phases. In an XX spin chain with symmetry-breaking quantum phase transitions, we reveal that the gradually decaying and damped oscillating modes of quantum coherence or quantum discord, along with two-site distance, can identify two spin-liquid phases, respectively. Moreover, based on our analytical results of spin correlation functions, we confirm the existence of long-range entanglement in the system and establish a connection between two-site entanglement and quantum phases. Furthermore, for the extended Ising model with topological phase transitions, we find that coherence and quantum discord behaviors can also signify topological quantum phases. In particular, we discover the quantum resource freezing phenomenon, where topologically protected long-range quantum resources may have potential applications in quantum information processing.

关键词： Geometric & topological phases Quantum coherence & coherence measures Quantum correlations, foundations & formalism Quantum discord Quantum entanglement Quantum phase transitions

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Unscented Kalman Filter-based Multi-IMU Combination for UAV GPS Anomaly Navigation System 8

Unscented Kalman Filter-based Multi-IMU Combination for UAV ...

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8th CAA International Conference on Vehicular Control and Intelligence, CVCI 2024

作者： Huang, Annan Li, Jingyan Zhu, Longlong Chen, Yuanzhe Tao, Fazhan Li, Mengyang College of Information Engineering Henan University of Science and Technology Luoyang China Wuhan Polytechnic University Faculty of Humanities and Media Wuhan China Henan High Score Application Information Technology Research Institute Co. R&d & Innovation Department Zhengzhou China Luoyang Normal University Faculty of Physics and Electronic Information Luoyang China

ISBN: (纸本)9798331504892

In the current unmanned aerial vehicle (UAV) technology, accurate positioning and navigation systems are very important to ensure flight safety and perform precise tasks. Especially when the GPS signal is blocked or unavailable, the traditional navigation system combined with a single micro-electro-mechanical system-inertial measurement unit (MEMS-IMU) often shows significant performance degradation. This paper proposes a multi-IMU combination technology based on unscented Kalman filtering (UKF) to optimize the navigation system of UA V s in the environment of GPS signal failure. By comparing the performance of a single IMU system with that of a system integrated with three IMU s in the simulation environment, and using the NaveGo framework to simulate the system, the research methods include simulating the two system configurations in the scenarios where GPS signals are shielded, to evaluate their position tracking ability and error distribution. The results show that the errors in the upward velocity estimation of each system are relatively stable, mainly within 0.5 m/s. This remarkable performance improvement proves the effectiveness of the multi-IMU system in improving error distribution and enhancing the robustness of the navigation system. The value of this research lies in that it not only improves the navigation accuracy of UAVs when the GPS signal fails but also provides strong technical support for the design of advanced navigation systems for UAV s in the future. © 2024 IEEE.

关键词： Kalman filters

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Five-user quantum virtual local area network with an AlGaAs entangled photon source

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science China(physics,Mechanics & Astronomy) 2025年第3期68卷 61-73页

作者： Cheng Qian Hongkai Tian Xu Jing Yichen Liu Zhe Chen Huiran Luo Yuan Du Xiaodong Zheng Tangsheng Chen Yuechan Kong Hua-Lei Yin Dong Jiang Bin Niu Liangliang Lu Key Laboratory of State Manipulation and Advanced Materials in Provincial Universities School of Physical Science and TechnologyNanjing Normal UniversityNanjing210023China School of Internet Anhui UniversityHefei230039China National Key Laboratory of Solid-State Microwave Devices and Circuits Nanjing Chip Valley Industrial Technology InstituteNanjing Electronic Devices InstituteNanjing210016China Research Center for Quantum Optics and Quantum Communication School of ScienceQingdao University of TechnologyQingdao266520China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education)Renmin University of ChinaBeijing100872China Beijing Academy of Quantum Information Sciences Beijing100193China National Engineering Research Center of Agro-Ecological Big Data Analysis and Application Anhui UniversityHefei230601China National Laboratory of Solid-State Microstructures and School of Physics Nanjing UniversityNanjing210093China Hefei National Laboratory Hefei230088China

The promotion of quantum network applications demands the scalable connection of quantum *** is preferable to set up multiple logical networks coexisting on a single physical network infrastructure to accommodate a larger number of *** we present a quantum virtual network architecture that offers this level of scalability,without being constrained to a fixed physical-layer network relying solely on passive multiplexing *** architecture can be understood as arising from the superposition of a fully connected entanglement distribution network and port-based virtual local area network,which group multiusers by access *** terms of hardware,we leverage a semiconductor chip with a high figure-of-merit modal overlap to directly generate high-quality polarization entanglement,and a streamlined polarization analysis module,which requires only one single-photon detector for each end *** experimentally perform the BBM92 QKD protocol on the five-user quantum virtual network and demonstrate voice and image encryption on a campus area *** results may provide insights into the realization of large-scale quantum networks with integrated and cost-efficient photonic architecture.

关键词： quantum network quantum entanglement distribution integrated photonics image and voice encryption

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A Novel Capacitive Sensor Featuring Surface Microstructure and Ion Gels for Measuring Full Pressure with High-Sensitivity

SSRN

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SSRN 2023年

作者： Fan, Leijin Liu, Yuantao Yang, Xiaofeng Sun, Hu Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The 5th Electronics Research Institute Ministry of Industry and Information Technology Guangzhou511370 China School of Aerospace Engineering Xiamen University Xiamen361005 China

Compared with positive pressure measurement, which is widely used in many fields, negative pressure measurement is often ignored. However, realizing full pressure measurement, that is, positive and negative pressure measurement, with high sensitivity and wide measurement range, is one of the most urgent development directions and key challenges faced by flexible pressure sensors. To overcome this challenging problem, a highly sensitive full-pressure capacitive sensor with surface microstructure and ion gels is introduced in this paper. The sensing mechanism of the sensor is implemented by detecting the capacitance change caused by the change in the contact area between the ion gel and the electrode due to the internal and external pressure difference. The PVA/KOH basic gel material is used to resist shear deformation, and the uniform microstructure on the gel surface is achieved by the template method. How to maximize the sensitivity of positive and negative pressure measurements is discussed by carefully evaluating the design parameters of the sensor. The fabricated sensor has a wide measurement range (-100 to 250 kPa) with high sensitivity (S = 15.6 nF/kPa) in the negative pressure region and (S = 5.2 nF/kPa) in the positive pressure region. In addition, the sensor exhibits fast response, cycle stability, and low measurement limit, which further enhances its performance advantages. In order to validate the application potential of the sensor, the paper conducts experimental verification using the relationship between wind pressure measurement results and the angle of contact with the sensor, as well as the relationship between vehicle speed and wind pressure magnitude. The results show that the designed sensor has potential application prospects in full pressure measurement. © 2023, The Authors. All rights reserved.

关键词： Capacitive sensors

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Phonon Transport Across Gan-Diamond Interface: The Nontrivial Role of Pre-Interface Vacancy-Phonon Scattering

SSRN

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SSRN 2023年

作者： Yang, Chao Wang, Jian Ma, Dezhi Li, Zhiqiang He, Zhiyuan Liu, Linhua Fu, Zhiwei Yang, Jia-Yue School of Energy and Power Engineering Shandong University Jinan250100 China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou510610 China Optics & Thermal Radiation Research Center Institute of Frontier and Interdisciplinary Science Shandong University Qingdao266237 China

Diamond substrate with superior thermal conductivity has been the most promising heat sink to solve the heat dissipation issues in GaN-based power electronics. The phonon transport behaviors across the GaN-diamond interface crucially determine the thermal performance and still remain largely unexplored especially considering the presence of pre-interface vacancies. Herein, the influence of localized high-concentration Ga/N atomic vacancies on phonon transport across the GaN-diamond interface is fully investigated using non-equilibrium molecular dynamics. The calculated interface thermal resistance (ITR) of the perfect GaN-diamond interface at room temperature is approximately 1.5 m2·K/GW, consistent with prediction of the diffusion mismatch model. After introducing the Ga/N vacancies at a concentration of 30%, the existence of vacancy-phonon scattering increases the interfacial thermal resistance (ITR) by up to 67%. Analyzing the phonon density of states and the spectral heat current, the heat flux contributed by GaN high-frequency phonons decreases after introducing vacancy defects. This is attributed that the vacancy-phonon scattering in GaN enhances anharmonic phonon scattering, and the phonon energy is redistributed among different phonon modes. Moreover, the collective vibration of propagation phonons is disrupted randomly by the vacancy-phonon scattering. This work aims to understand the influence of vacancy-phonon scattering on the phonon transport across GaN-diamond interface and provide helpful guidance to engineering such interface for better heat dissipation performance. © 2023, The Authors. All rights reserved.

关键词： Diamonds

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Stirred-Electrodeposition Construction of Porous Fe-Doped Nise Nanoclusters as a Bifunctional Catalyst for Water Splitting

SSRN

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SSRN 2023年

作者： Mo, Dingdiao Zhang, Jiaxing Chen, Guoxiang Huang, Zihao Liu, Xiangao Cai, Weitong Cui, Jie Su, Wei School of Materials and Energy Guangdong University of Technology Guangdong Guangzhou510006 China Analytical and Testing Center South China University of Technology Guangzhou510640 China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Guangdong University of Technology China

Transition metal selenisation is a promising approach for improving the catalytic activity for overall water splitting. However, electrodeposited NiSe electrocatalysts have not exhibited excellent overall water-splitting performance. Herein, a simple stirring-electrodeposition strategy was developed to reconfigure the catalyst morphology, and the proportion of the Fe dopant (Ni/Fe) was adjusted to synthesize a Fe-doped NiSe electrocatalyst with a 3D nanocluster morphology (named Ni0.5Fe0.5Ses/NF). This morphology combined the advantages of porous 3D nanoclusters, which have large specific surface areas, more exposed active sites and accelerated electron transfer rates compared to the 2D NiSe catalysts synthesized by electrodeposition. In addition, XPS characterization confirmed that Fe doping optimized the electronic structure of NiSe. The changes occurring in the surface compositions of NiSe/NF and Ni0.5Fe0.5Se-s/NF during the oxygen evolution reaction (OER) were also characterized by in situ Raman spectroscopy, which revealed that Fe doping enabled faster surface reconstruction of the electrocatalyst and confirmed that the active sites were NiOOH species. DTF calculations showed that Fe doping raised the d-states of the Ni atoms in Ni0.5Fe0.5Se-s/NF closer to the Fermi level than those of the Ni atoms in NiSe/NF, which led to significant improvement in the electrical conductivity. Benefiting from these properties, Ni0.5Fe0.5Se-s/NF required low overpotentials of only 185/266 mV and 101/271 mV at 10 and 300 mA cm-2 to drive the OER and HER in 1 M KOH solutions, respectively, and the assembled Ni0.5Fe0.5Se-s/NF||Ni0.5Fe0.5Se-s/NF system only required an ultralow potential of 1.48 V at 10 mA cm-2 to catalyze stable water splitting for more than 60 h. This work provides a new strategy for designing advanced bifunctional electrocatalysts to achieve overall water splitting. © 2023, The Authors. All rights reserved.

关键词： Selenium compounds

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Pressure-induced phase transition in transition metal trifluorides

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Chinese physics B 2022年第10期31卷 102-106页

作者： Peng Liu Meiling Xu Jian Lv Pengyue Gao Chengxi Huang Yinwei Li Jianyun Wang Yanchao Wang Mi Zhou State Key Laboratory of Superhard Materials&International Center for Computational Method and Software College of PhysicsJilin UniversityChangchun 130012China Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing Nanjing University of Science and TechnologyNanjing 210094China

As a fundamental thermodynamic variable, pressure can alter the bonding patterns and drive phase transitions leading to the creation of new high-pressure phases with exotic properties that are inaccessible at ambient pressure. Using the swarm intelligence structural prediction method, the phase transition of TiF_(3), from R-3c to the Pnma phase, was predicted at high pressure, accompanied by the destruction of TiF_6 octahedra and formation of TiF_8 square antiprismatic units. The Pnma phase of TiF_(3), formed using the laser-heated diamond-anvil-cell technique was confirmed via high-pressure x-ray diffraction experiments. Furthermore, the in situ electrical measurements indicate that the newly found Pnma phase has a semiconducting character, which is also consistent with the electronic band structure calculations. Finally, it was shown that this pressure-induced phase transition is a general phenomenon in ScF_(3), VF_(3), CrF_(3), and MnF_(3), offering valuable insights into the high-pressure phases of transition metal trifluorides.

关键词： high-pressure structure transition crystal structure prediction high-pressure x-ray diffraction experiments transition metal

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