A5100423250- High voltage insulation and dielectric phenomena
- Power Transformer Diagnostics and Insulation
- High-Voltage Power Transmission Systems
- Silicon Carbide Semiconductor Technologies
- Induction Heating and Inverter Technology
- Hydraulic Fracturing and Reservoir Analysis
- Lightning and Electromagnetic Phenomena
- Drilling and Well Engineering
- Structural Load-Bearing Analysis
- Electronic Packaging and Soldering Technologies
- Structural Behavior of Reinforced Concrete
- Thermal Analysis in Power Transmission
- Advanced machining processes and optimization
- Aerodynamics and Fluid Dynamics Research
- Microwave Engineering and Waveguides
- Polymer Nanocomposites and Properties
- Aerosol Filtration and Electrostatic Precipitation
- Fluid Dynamics and Vibration Analysis
- Advanced Surface Polishing Techniques
- Advanced Sensor and Control Systems
- Heat Transfer and Optimization
- Epoxy Resin Curing Processes
- Electromagnetic Compatibility and Noise Suppression
- Thin-Film Transistor Technologies
- Fire effects on concrete materials
Beijing Institute of Petrochemical Technology
2014-2025
Hubei University of Arts and Science
2024
Xi'an Jiaotong University
2010-2024
China University of Petroleum, East China
2023-2024
State Key Laboratory of Electrical Insulation and Power Equipment
2022-2024
Shanghai Jiao Tong University
2024
Beihang University
2016-2023
Chongqing Jiaotong University
2023
China Southern Power Grid (China)
2013-2023
China Electronics Technology Group Corporation
2017-2023
Based on the theoretical study and field application of volume stimulation in horizontal wells over past 10 years, core connotation was further interpreted. The implementation methods, design models key issues were analyzed, future development direction put forward. research shows that multi-cluster limited entry technique can achieve homogenous growth multiple fractures. hybrid "breaking by rock gel + carrying proppant slick water" plus small-particle reduce fracture complexity near well...
Summary Creating uniform multiple fractures is a challenging task due to reservoir heterogeneity and stress shadow. Limited-entry perforation in-stage diversion are commonly used improve multifracture treatments. Many studies have investigated the mechanism of limited-entry for treatments, but relatively few focused on process. The design usually through trial error because lack simulator. In this study, we present fully coupled planar 2D model simulating objective evaluate flux...
Abstract Dielectric film capacitors have aroused considerable attention on account of the fast development pulsed power systems. However, enhanced energy density is always acquired at cost deteriorated charge/discharge efficiency. Herein, well balanced and efficiency are achieved in a series reasonably designed bilayer composites consisting ferroelectric layer paraelectric meantime. It interesting to find that, when merely 1.6 wt% Zr(HPO 4 ) 2 nanosheets introduced into layer, substantially...
Abstract Titanium dioxide nanoparticles (TiO 2 NPs), as largest production and use of nanomaterials, have been demonstrated to a potential toxicity on reproductive system. However, the mechanism underlying male TiO NPs remains limited. Thus, our study was designed examine cellular viability, apoptosis, oxidative stress, antioxidant capacity, expression apoptotic cytokines in primary cultured Sertoli cells isolated from mice under exposure. Results showed that exposure 5 30 μg/mL resulted...
ABSTRACT The agglomeration of polybutadiene latex (PBL) is a complex process influenced by numerous factors. Up to now, the change particle size agglomerated PBL with time under varying conditions remains unclear, and kinetic model has not been proposed. In this study, influence parameters on was studied, including amount agglomerating agent, temperature, stirring rate, solid content PBL. According evolution PBL, divided into two stages, dispersion agent its adsorption coalescence (stage I),...
Modular Multilevel Converter (MMC) has been accepted as the most competitive alternative for Voltage Source (VSC) HVDC application. It is a very important issue to evaluate converter losses and efficiency VSC-HVDC installation. A method proposed calculate of MMC using digital calculation way. The switching waveforms are simulated in voltage current line-frequency period thereby obtained. Then parameters provided device datasheet, conduction can be program was developed calculated various...
For continuous or spiral windings which feature multiple continuously transposed conductors (CTC) wound in parallel, the transposition structure is commonly used to suppress circulation between conductors. This introduces a local asymmetry transformer windings. Fault analyses have shown that building an asymmetric transformers increases deformation risk these Researchers yet fully investigate this structure. study was conducted observe influence of 110 kV transformer. The conductor's...
Compared to bushings with lower voltage levels, the ±1100 kV converter valve‐side bushing has thicker radial insulation and longer axial resulting in a more uneven temperature distribution severe electric field distortion, especially under high‐ambient‐temperature high‐current conditions. Improving of electro‐thermal coupled is critical for safe operation transformers. This study discusses typical proposes new method evaluate conductivity multiple capacitor layers inhomogeneous temperatures....
Insulation breakdown of dry-type valve-side bushing cores under electrothermal compound stress has become a key factor limiting the safe and stable operation converter transformer. Based on slices real core, it is observed for first time that fold, peeling off, fracture defects exist near aluminium (Al) foil edge, accompanied by many metal spikes with curvature radius <4 μm. Coupled capacitor screen thickness ∼2 mm, an electrical tree model designed to simulate insulation edges inside cores,...
The temperature of a deep shale reservoir may reach more than 100°C, and the effect thermal shock on hydraulic fracturing has rarely not been considered in previous studies. Based mesoscopic damage mechanics finite element method, thermo-hydro-mechanical-damage (THMD) coupling model considering temperature, seepage, stress, fields was constructed to investigate effects convective heat transfer coefficient ( h), in-situ stress difference bedding plane angle α θ ) fracturing. results show that...
In this study, the in-situ compatibilization reaction between recycled acrylonitrile–butadiene–styrene copolymer (rABS) and functional styrene–ethylene–butylene–styrene block maleic anhydride (SEBS-g-MAH) was confirmed, which contributed to toughening phenomenon of rABS, especially notched impact strength. As mechanical test that manifested, rABS/SEBS-g-MAH blends are stronger more ductile than rABS/SEBS blends. Prominently, former has great advantage over latter in terms improving...
Ball-sealer in-stage diversion in horizontal wells is a key technique to realize the uniform stimulation of fractured sections tight oil and gas reservoirs. So far, however, there are fewer research results on propagation morphologies multi-cluster fractures after implementation different ball-sealer processes during fracturing treatment, which less theoretical support for preparation field process measures impacts its application effects field. To deal with this situation, paper established...
The choice of mechanical and electrical topologies can affect piezoelectric energy harvesting efficiency, but the problem achieving high-efficiency conversion in harvesters stacked as cantilevers has not been perfectly solved. This study focuses on topology elements a vehicle suspension vibration device. Through theoretical analysis, stress expressions excited driven are derived. is affected by positions connection excitation points. A model was established for four-piece element connected...
As the operation performances and reliability of semiconductor devices are tightly related to its junction temperature, research on temperature prediction thermal modeling do a significant meaning extend services lifetime improve application IGBT modules. The physical structure conception, RC compact network component model, test principle extraction platform transient impedance module briefly introduced. parameters Foster certain type is derived based junction-to-case curve. With can be...