A5029795504- Advanced SAR Imaging Techniques
- Radar Systems and Signal Processing
- Electromagnetic Scattering and Analysis
- Geophysical Methods and Applications
- Ocean Waves and Remote Sensing
- Electromagnetic Simulation and Numerical Methods
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Radio Wave Propagation Studies
- Microwave Imaging and Scattering Analysis
- Microwave Engineering and Waveguides
- Underwater Acoustics Research
- Additive Manufacturing Materials and Processes
- Soil Moisture and Remote Sensing
- Complex Network Analysis Techniques
- Antenna Design and Analysis
- Advanced Optical Sensing Technologies
- Structural Health Monitoring Techniques
- High Entropy Alloys Studies
- Millimeter-Wave Propagation and Modeling
- High-Voltage Power Transmission Systems
- Simulation and Modeling Applications
- Industrial Technology and Control Systems
- Coastal and Marine Dynamics
- Antenna Design and Optimization
- Optical measurement and interference techniques
Xidian University
2015-2024
Changsha University of Science and Technology
2021-2024
Anhui Normal University
2024
Yangzhou University
2016-2023
Northeastern University
2020
Xi'an Railway Survey and Design Institute
2020
Jiangsu Normal University
2019
Naval University of Engineering
2019
Shanghai Normal University
2018
Huazhong University of Science and Technology
2018
This review examines the methods used to optimize process parameters of laser cladding, including traditional optimization algorithms such as single-factor, regression analysis, response surface, and Taguchi, well intelligent system neural network models, genetic algorithms, support vector machines, new non-dominance ranking algorithm II, particle swarm algorithms. The advantages disadvantages various cladding are analyzed summarized. Finally, development trend in field is summarized...
High chromium superalloys have good overall mechanical properties and are widely used in critical hot-end components. The current manufacturing process still faces the problem of low forming efficiency. Extreme high-speed laser metal deposition (EHLMD) is a new efficient additive technology that can quickly directly shape direct difficult-to-process materials. However, EHLMD possesses some inter-layer defects alloy due to its excessively fast scanning speed, implying there potential for...
An improved hybrid method of backward shooting and bouncing ray (SBR) physical optics (PO)/physical theory diffraction (PTD) is proposed to investigate the scattering from a three-dimensional electrically large target. The basic idea combine forward-ray-tracing technique accelerate original backward-ray-tracing one. significantly reduces computational complexity while ensuring same accuracy with traditional SBR method. performance our are validated evaluated by comparison exact...
A Non-negative Matrix Factorization (NMF)-based method is proposed to solve the link prediction problem in dynamic graphs. The learns latent features from temporal and topological structure of a network can obtain higher results. We present novel iterative rules construct matrix factors that carry important prove convergence correctness these algorithms. Finally, we demonstrate how NMF express dynamics efficiently rather than by static representation, thereby yielding better performance....
Homologous recombination (HR), which mediates the repair of DNA double-strand breaks (DSB), is crucial for maintaining genomic integrity and enhancing survival in response to chemotherapy radiotherapy human cancers. However, mechanisms HR treatment resistance improvement cancer therapy remains unclear. Here, we report that zinc finger protein 830 (ZNF830) promotes cells damage. Mechanistically, ZNF830 directly participates end resection via interacting with CtIP regulating recruitment damage...
In this article, we propose a hybrid approach that combines machine learning and experimental design to efficiently accurately predict the monostatic radar cross section (RCS) of conducting target versus incident angle. The is called physical optics-inspired support vector regression (POI-SVR). its kernel function inspired by PO. Uniform (UD) uniform sampling (UDS) are introduced obtain highly representative training samples. Numerical experiments dealing with simple complex targets carried...
A hybrid approach combining the edge-based vector finite-element method (FEM) and of moments (MoM) is first extended to study 3-D scattering from a dielectric object above conductive rough surface. The FEM/MoM technique based on electric field Helmholtz's equation. To reduce calculational domain, solution region divided into FEM containing MoM In our method, tetrahedral elements are applied handle basis functions, whereas triangular used deal with surface Rao-Wilton-Glisson functions....
Pneumatic conveying pipe is an important part of the coal industry. Its working environment harsh, and it mainly affected by serious wear corrosion, which affects its operating life. Studying a method strengthening wall pneumatic great significance. In this paper, nickel-based alloy coatings with different WC (tungsten carbide) contents were prepared using oscillating laser-cladding process, micro-characterization characteristics, resistance corrosion laser-cladded layer discussed. The main...
We present remarkably simple proofs of Burkholder--Davis--Gundy inequalities for stochastic integrals and maximal convolutions in Banach spaces driven by Lévy-type processes. Exponential estimates are obtained two versions Itô's formula also derived. Based on the inequality, existence uniqueness mild solutions quasi-geostrophic equation with Lévy noise is established.
The outboard corner reflectors are widely used as a countermeasure to radar tracking and detection. Therefore, it is essential determine the composite time-domain scattering characteristics of reflector ship against sea background jamming effectiveness array. In this paper, electromagnetic target, reflector, surface studied based on bouncing ray method (TDSBR). echo broadband cross section (RCS) results for time domain pulse incident also obtained high-resolution range profile (HRRP)...
The electromagnetic (EM) scattering properties of the chaff cloud in airflow are rarely addressed previous works. To deal with this issue, two types clouds first established based on aerodynamics theories. Then, K-means algorithm is utilized to divide into several parts according elements' number density. Meanwhile, EM transmission property each part extracted help method-of-moments (MoM). Based this, vector radiative transfer (VRT) method introduced estimate bistatic coefficients 40 million...
The influence of DRFM active jamming technology on pulse compression coherent radar is studied here. By establishing signal detection model and introducing equation, the produced by performance receiver analysed, relationship between probability interference power obtained. Finally, effective index for judging effect summarised, range determined.
In this paper, we investigate the interference alignment (IA) for a class of partially connected multi-input multi-output heterogeneous networks, which consist L fully pico cells, J and one macro cell. particular, feasibility IA conditions with no channel extensions, T-independent T-dependent respectively, single beam case. We present three theorems to characterize some necessary conditions, L, J, T, diversity order L̅ must jointly satisfy when are feasible. These also implicitly impose...
The presence of sea spikes can cause the radar false alarm probability rise and performance degradation multi-target environment detection. Therefore, study phenomenon is great significance. HH polarization scattering intensity close to or even greater than VV an important feature spike phenomenon. Overturning wave crest considered be one reasons generating spike. In this paper, overturning model introduced with consideration wind speed, method moment used for studying backward coefficient...
In this letter, we propose an improved Gaussian process regression (GPR) to accurately predict the monostatic radar cross section of conducting targets as a function incident angle and frequency. Inspired by physical optics, assume covariance sum linear periodic functions. Experiments involving simulated measured data are carried out assess proposed method. Results show that our method has better prediction performance than GPR with local function, consistent reduction, up 39% on 43% data,...
Chaff cloud is widely used in target covering. In this paper, a jamming performance estimation strategy presented for the elliptical and cubic chaff clouds. The range profiles of composite models plane with are experimentally accessed an anechoic chamber using stepped-frequency waveform measurement system. Then, dimensions, characteristic length, distributing entropy equivalent scattering centers jammer extracted from measured profiles, respectively. Based on these features, support vector...
We propose an inverse synthetic aperture radar (ISAR) imaging algorithm for a composite target-ocean scene based on time-domain shooting and bouncing rays (TDSBR) method. To do this, we develop the TDSBR method to simulate electromagnetic scattering echoes from scene. Then, derive ISAR formulas field expressions. The demodulation, pulse compression, azimuth fast Fourier transform are performed echo data obtain images. Linear frequency modulation (LFM) pulses usually used in traditional...
The electron density distribution of plasma is an important parameter to study the effect on electromagnetic wave attenuation. However, obtain accurately, it necessary calculate temperature first. calculation methods are mostly affected by thermodynamic equilibrium state, but collision cross section not state. A high-voltage coil was designed as a excitation source generate inductively coupled argon in cylindrical cavity. emission spectra inside cavity were recorded, and calculated based...
Abstract Transmission lines are affected by aeolian vibration, sandstorms and acid rain, which cause structural damage eventually lead to line breaking accidents. In this paper, the health monitoring technology of conductors is researched, a system for designed. First, based on structure ACSR (Aluminum Conductor Steel Reinforced) conductor dynamic equation, relation between natural frequencies obtained. Then, an online proposed, key issues, such as power supply solution sensors, data...
This paper studies the influence of wind parameters and fractal dimension from an improved two-dimensional sea surface on polarimetric scattering by using facet integration. A simulated is discretized into three matrices facets including a height matrix two slope orthogonal directions. Based Kirchhoff approximation, scattered field derived in Cartesian coordinate system integration mentioned above. Finally, fully polarised radar cross section numerically dependence surface, such as speed,...
Foreign object debris (FODs) may cause accidents or disasters. Recently, FOD detection systems have been developed and tested on airports. Most of them are based the association a mm-wave radar an optical sensor. This paper describes compact broadband (77-78 GHz) front-end used for application. In this paper, foreign system is introduced, then principle composition given. Finally, key technologies about antenna, RF component, signal processing, data processing etc,