A5032022003- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Solar and Space Plasma Dynamics
- Advanced Topics in Algebra
- Rings, Modules, and Algebras
- Advanced X-ray and CT Imaging
- Video Surveillance and Tracking Methods
- Robotics and Sensor-Based Localization
- Seismic Waves and Analysis
- Speech and Audio Processing
- Extraction and Separation Processes
- Radiomics and Machine Learning in Medical Imaging
- Human Pose and Action Recognition
- High voltage insulation and dielectric phenomena
- Music and Audio Processing
- Gyrotron and Vacuum Electronics Research
- Algebraic structures and combinatorial models
- Speech Recognition and Synthesis
- earthquake and tectonic studies
- Advanced Neural Network Applications
- Inertial Sensor and Navigation
- Smart Parking Systems Research
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Geomagnetism and Paleomagnetism Studies
National Engineering Research Center of Electromagnetic Radiation Control Materials
2018-2024
Nanjing University
2024
University of Science and Technology Liaoning
2022
Nanjing University of Information Science and Technology
2022
Shenzhen Polytechnic
2022
Xidian University
2019
Amplitude modulation high-frequency (HF) radio waves at extremely low frequencies (ELF, 0.3-3 kHz) or very (VLF, 3-30 kHz), heating the ionosphere, can nonlinearly modulate auroral electrojet to produce ELF/VLF for long-distance communication. This article presents results of first communication experiments being conducted Tromsø, where European Incoherent Scatter Scientific Association (EISCAT) HF facility is located. The from ionosphere are modulated by quaternary phase shift keying (QPSK)...
In this paper, the experimental results of extremely/very low frequency (ELF/VLF) radiation from ionosphere by amplitude modulation (AM) mode and dual-beam beat-wave (BW) heating using European Incoherent Scatter Scientific Association (EISCAT) facility are presented. By comparing dependence ELF/VLF sources formed AM BW models on geomagnetic field disturbance differences in different periods, paper aims to examine some issues such as source regions mechanisms addressed theoretical study...
This paper presents the experimental results of modulation and heating ionosphere using European Incoherent Scatter facility in Troms ϕ, Norway, facility. The frequency characteristics excited extremely low (ELF)/very (VLF) radiation sources amplitude modulated (AM) dual-beam beat-wave (BW) modes are compared, polarization horizontal ELF/VLF magnetic field received at 15 km from is studied. show that AM mode, signal decreases as increases when reaches maximum 2017 Hz. In BW appears Hz, but...
Person re-identification plays an important role in the construction of smart city. A reliable person system relieves users from inefficient work identifying specific individual enormous numbers photos or videos captured by different surveillance devices. The most existing methods either focus on local discriminative features without global contextual information scatter while ignoring features, resulting ineffective attention to irregular pedestrian zones. In this article, a novel...
In this paper, our main aim is to study periodic and potent elements of a ring. We specially graded rings generalize some classical results related idempotent polynomial rings. show that (von Neumann) quasi-inverse element root unity. the isomorphism analyze closure properties set [Formula: see text] ring text]. The endomorphism Fitting module are described, we apply matrices over division case finite fields, connect features with exponent their minimal polynomials.
Modulation heating of the ionosphere using high-power high-frequency (HF) radio waves can generate an extremely low frequency (ELF) radiation source in ionosphere, such as amplitude-modulation (AM) auroral electrojet or two HF to illuminate same region form beat-wave (BW) modulation. We first present observations ELF received on China seismo-electromagnetic satellite (CSES) and ground simultaneously, which were excited European Incoherent Scatter Scientific Association (EISCAT) modulation...
The sporadic-E (Es) layer is a thin of several kilometers existing at an altitude around 100 km and features extremely dense ionized irregularities, which can reflect or scatter high frequency (HF) very (VHF) radio waves. most popular theoretical explanation for mid-latitude Es formation the wind shear theory. Measurements by rocket souding have shown that has electron density relatively sharp gradient in vertical direction. one-hop propagation VHF signal even reach as far 2000 km. In this...
By analyzing the experimental data of ionospheric modulation heating during EISCAT experiment, it is shown that intensity ELF/VLF signal excited by AM mode one order magnitude higher than BW mode. However, compared with mode, has no harmonic component, is, excitation quality better
Artificial field-aligned irregularities (AFAI) induced by ionospheric heating has the property of artificial scattering (AFAS) to incident wave, which can be used in long distance VHF transmissions. According physical model AFAS, a calculation been deduced for available area supporting AFAS transmission given station. Simulation results show that increase with decreasing inclination, what means great advantage mid- and low-latitude The also that, increasing height, increase, decrease have...
An element a of ring R is called weak zero-divisor if there exists nonzero x such that xa nilpotent. As new generalization nil clean rings, we define to be zero-clean each its elements sum and an idempotent. We give some examples properties rings discuss the relationships between related rings. Some extensions are studied. Also, study uniquely characterizations
We call a ring~R is JN if whose Jacobson radical coincides with upper nilradical, and R right SR each element r∈ can be written as r=s+r where s an from the socle r regular of~R. rings class of special subrings rings, which extension soclean rings. give their some characterizations examples, investigate relationship between related respectively.