A5069578464- Electromagnetic Launch and Propulsion Technology
- Fluid Dynamics and Heat Transfer
- Fluid Dynamics Simulations and Interactions
- High-Velocity Impact and Material Behavior
- Additive Manufacturing Materials and Processes
- Image and Signal Denoising Methods
- Surface Modification and Superhydrophobicity
- Energetic Materials and Combustion
- Geophysics and Sensor Technology
- Fluid Dynamics and Vibration Analysis
- Drilling and Well Engineering
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Measurement and Detection Methods
- Welding Techniques and Residual Stresses
- Hydraulic Fracturing and Reservoir Analysis
- Advanced DC-DC Converters
- Pulsars and Gravitational Waves Research
- Remote-Sensing Image Classification
- Advanced X-ray and CT Imaging
- Technology Assessment and Management
- High Entropy Alloys Studies
- Offshore Engineering and Technologies
- Cosmology and Gravitation Theories
Harbin Engineering University
2024
Naval University of Engineering
2017-2021
Fudan University
2019
We present the study of a sample seven "bare" active galactic nuclei (AGN) observed with Suzaku. interpret spectrum these sources relativistic reflection component and we employ our model RELXILL_NK to test Kerr nature their supermassive black holes. constrain Johannsen deformation parameters $\alpha_{13}$ $\alpha_{22}$, in which metric is recovered when $\alpha_{13} = \alpha_{22} 0$. All measurements are consistent hypothesis that spacetime geometry around objects described by solution. For...
The flow behavior of droplet on substrates is widespread in industry and nature, it a complex process multi-field coupling, involving two-phase droplet–substrate interaction. In this manuscript, we focus the fluid interfacial at junction gas–liquid–solid phases propose robust stable implementation algorithm to capture physical phenomena such as spreading with different wettability, using gas–liquid surface tension equilibrium contact angle input parameters. We apply under flat curved...
Abstract In order to improve the welding efficiency and performance of aluminum alloy thin-walled structural components in fields projectiles, aerospace, rail transportation, this paper studies rapid laser self-fusion process, joint microstructure, mechanical properties 2 mm-thick 6082 alloy. The results show that through exploration process parameters, six groups welds with good forming no metallurgical defects are obtained, fastest speed reaches 6 m/min. weld microstructure consists a...
Abstract Multi-angle transverse laser cladding experiments are conducted using 316L stainless steel powder to investigate the effects of feeding rate, power, and scanning speed on cross-sectional size layer (cladding height, width, depth) top offset layers at 0°, 45°, 90°, 135°. Concurrently, microstructure hardness examined. The results show that increasing feed rate leads a gradual rise in height from 0° 135°, with width initially then decreasing, depth gradually diminishing. also...
Abstract In order to overcome the drawback of existing image enhancement technologies and further consider pixel intensity expression error caused by imaging, a novel fuzzy inference‐based contextual dissimilarity histogram equalization (FICDHE) algorithm is proposed. The proposed composed three modules. first module, according calculated probable intervals, membership functions are generated. second one, inference systems established each calculated. third histograms clipped equalized....
In this paper, it is mainly aimed to study the working condition when there exists multiple armatures in launch tubes process of hyper velocity launching electromagnetic coil launcher. On basis understanding single stage induction principle, article expounds kind condition, and based on circuit an electrical mechanical model for continuous emission launcher with set up. Through systematic description equivalent control equation, thrust equation motion, further mechanism Dynamic simulation...
With drilling exploration extending to deeper water, the total top tension lift a riser increases accordingly. Tensioners with higher capacity are preferred minimize number of tensioners due space limitation on vessel. Higher requires more advanced recoil control for emergency events. Hydro-pneumatic widely used risers anti-recoil in deep and commonly simulated as an equivalent linear or nonlinear spring pneumatic system. The discrepancy between simulation measurement calls model rate...
Within the disk-corona model, it is natural to expect that a fraction of reflection photons from disk are Compton scattered by hot corona (reflection Comptonization), even if this effect usually ignored in X-ray spectroscopy studies. We study using NICER and NuSTAR data Galactic black hole EXO 1846-031 hard-intermediate state with model SIMPLCUTX. Our analysis suggests order 10% required fit data, but inclusion Comptonization does not change appreciably measurements key-parameters like spin...
Abstract With the increasing exploration of polar regions, problem fatigue crack propagation during ice-breaking operations ships in low-temperature environments has received more and attention, which put forward higher requirements on mechanical properties high-strength steels used hulls typical details environments. In this context, study environment is caried out. The main contents paper are as follows: Test specimens with a through-thickness initial designed based bow stiffened plate...
In electromagnetic launching, the launching speed, as a key index of system, is great significance. this paper, method B-dot magnetic probe array used to measure velocity projectile in-bore. A non-contact measurement outside-bore based on high-speed video system and digital image post-processing technology proposed. The measured experimentally curve obtained. From results, in processing, by using inert projectile, enters attenuation stage randomly after its ejection, there no acceleration...
Abstract In MRI, the image with poor quality, especially noise interference or low contrast, may provide insufficient data for visual interpretation of affected part. Image segmentation provides an effective method to facilitate early detection and further diagnosis. By introducing a Particle Swarm Optimization (PSO) initialization step novel dissimilarity measure metric, we present local information kernelized fuzzy C‐means (LIKFCM) algorithm segmentation. The considering adaptive tradeoff...
The rotational velocities of stars on the outskirts spiral galaxies were found to vary minimally with galactic distances, for which existing laws gravitation required more mass than detectable galaxy mass. This is referred as missing-mass problem. Some astrophysicists have assumed presence large amounts dark matter, and Milgrom modified Newton’s universal method empirically converted it an inverse linear law, has successfully explained a broad range astrophysical phenomena; however,...
The copper-skin pulse inductor serve the function of adjusting wave and changing current width power supply (PPS). When PPS discharges will continue working under condition a large current, It temperature continuously rise due to Joule heat effect current. This is challenge heat-proof property insulating material between layers copper skin inductors. Therefore, it necessary conduct research on rise. According its actual conditions this paper proposes analytical expression distribution,...
It is difficult to study the interaction mechanism between electromagnetic energy and metal materials directly in rail launcher. Based on existing test conditions, under condition of tens kiloamperes current, loading mode long pulse current combined with external magnetic field adopted, which equivalent extreme environment thermodynamic synthesis process launching. In this paper, through theoretical calculation ANSYS simulation, distribution circular, rectangular, elliptic straight slot...