A5007019578- Turbomachinery Performance and Optimization
- Electronic and Structural Properties of Oxides
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Fluid Dynamics and Turbulent Flows
- Refrigeration and Air Conditioning Technologies
- Heat Transfer Mechanisms
- Advanced Multi-Objective Optimization Algorithms
- TiO2 Photocatalysis and Solar Cells
- Non-Destructive Testing Techniques
- Catalysis and Oxidation Reactions
- Probabilistic and Robust Engineering Design
- Microstructure and Mechanical Properties of Steels
- Magnetic Properties and Applications
- Aerodynamics and Fluid Dynamics Research
- Surface Roughness and Optical Measurements
- Welding Techniques and Residual Stresses
- Nuclear materials and radiation effects
- Tribology and Lubrication Engineering
- Heavy metals in environment
- Heat Transfer and Optimization
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Advanced ceramic materials synthesis
Henan Institute of Geological Survey
2025
Nanchang Hangkong University
2022-2025
Institute of Engineering Thermophysics
2021-2023
Chinese Academy of Sciences
2021-2023
University of Chinese Academy of Sciences
2021-2023
City University of Hong Kong
2023
Princeton University
2008-2011
Hubei University
2009
Tulane University
2009
First-principles density-functional theory calculations in the generalized gradient approximation are carried out to study relative stabilities of oxygen vacancies at surface and subsurface sites anatase ${\text{TiO}}_{2}(101)$ ${\text{TiO}}_{2}(001)$, and, for comparison, prototypical rutile ${\text{TiO}}_{2}(110)$ surface. Our results indicate that these defects significantly more stable than case surfaces, whereas bridging favored O ${\text{TiO}}_{2}(110)$. Also, O-vacancy diffusion...
Scanning tunneling microscopy (STM) images taken on a freshly cleaved anatase TiO2(101) sample show an almost perfect surface with very few subsurface impurities and adsorbates. Surface oxygen vacancies are not typically present but can be induced by electron bombardment. In contrast, reduced (101) crystal shows isolated as well ordered intrinsic defects in STM, consistent density functional theory (DFT) calculations which predict that O (V_{O}'s) at bulk sites significantly more stable than...
The adsorption of water on a reduced TiO2 anatase (101) surface is investigated with scanning tunneling microscopy and density functional theory calculations. presence subsurface defects, which are prevalent (101), leads to higher desorption temperature adsorbed water, indicating an enhanced binding due the defects. Theoretical calculations surfaces containing oxygen vacancies or titanium interstitials show strong selectivity for sites in vicinity Moreover, energy at these considerably than...
We report on density functional theory (DFT) calculations of the formation energies and diffusion pathways oxygen vacancies Ti interstitials at near (101) surface in bulk anatase polymorph TiO2. At generalized gradient approximation level, both defects are found to be energetically more stable by ∼0.5 eV or subsurface sites than surface. Moreover, energy barriers diffuse from rather low, while opposite is true for This indicates that similar interstitials, also should preferentially occur...
Anatase TiO(2) is a widely used photocatalytic material, and catechol (1,2-benzendiol) model organic sensitizer for dye-sensitized solar cells. The growth the organization of catecholate monolayer on anatase (101) surface were investigated with scanning tunneling microscopy density functional theory calculations. Isolated molecules adsorb preferentially at steps. On terraces, monodentate ('D1') bidentate ('D2') conformations are both present in dilute limit, frequent interconversions can...
Hydroxide (OH−) ions at or near the interface between water and titanium dioxide (TiO2) have an important role in many surface photocatalytic reactions, possibly including photo-oxidation of water. Using first principles molecular dynamics (FPMD) simulations on time scale 30−40 ps, we investigated structure electronic properties a solvated adsorbed OH− liquid stoichiometric anatase TiO2(101) slab. We observed that hydroxide ion diffuses spontaneously from bulk toward surface, result...
The squealer tip has significant influence on both the aerodynamic and heat transfer characteristics of high-pressure turbine blade. However, due to complexity parameterization meshing complicated flow structure within over-tip region, existing designs in open literature have constant heights. In this paper, design space height with non-uniform is extended new features it may bring are investigated. A system specifically designed for using five control parameters implemented automatically...
Squealer tip has a significant influence on both aerodynamic and heat transfer characteristics of the high-pressure turbine. Among geometric parameters squealer, squealer height is one essential in design. However, due to complexity parameterization meshing related research usually carried out with constant height. In this paper, strategy generates assigned heights at four key positions blade, leading edge-pressure side, edge-suction trailing side. An in-house mesh generation platform...
The accumulation of cadmium （Cd） in the food chain poses a serious threat to human health. To explore possible heavy metal cation inhibitor, pot experiment was developed research addition Fe, Mn, Zn, and Mg on Cd uptake wheat rice. Soil content artificially added 5 mg·kg-1 aged for one month. Zn were as chlorides at ratio 100 300 mg·kg-1. main results were： ① supplementation significantly enhanced grain biomass rice； ② remarkably reduced rice, with decrease 41% 23% rice compared that...
In this paper, we propose a classification and quantitative method based on the optimization model of dimensionality reduction for detecting crack defects in superalloy turbine disks using multifeature weak magnetic signals. First, experiment nondestructive testing was conducted defects, resulting acquisition 112 sets preset anomaly eigenvalue data. The multidimensional signal features then reduced principal component analysis to construct feature sample library. On basis, support vector...
In the present study, a numerical simulation was conducted to investigate influence of surface roughness on aerodynamic performance 1.5-stage highly loaded axial compressor at low Reynolds number. It especially considered how number(k+) affected change inlet and outlet conditions, growth separation bubble (LSB), status limiting streamline, patterns wake. Regarding settings, five magnitudes were mainly studied. The results showed that Re, improved stage by reducing length width LSB, delaying...
In the present study, a numerical simulation was conducted to investigate influence of surface roughness on aerodynamic performance 1.5-stage highly loaded axial compressor at low Reynolds number. It especially considered how number ( <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" id="M1"> <a:msup> <a:mrow> <a:mi>k</a:mi> </a:mrow> <a:mo>+</a:mo> </a:msup> </a:math> ) affected change inlet and outlet conditions, growth separation bubble (LSB), status limiting streamline, patterns wake....
Aggressive s-shaped compressor transition ducts are important components in the connection between upstream boosters and downstream high-pressure compressors. The flow path is an channel with struts a large radial drop length ratio, which breaks through limitations of traditional design has aerodynamic loss. Therefore, this paper considers aggressive duct geared turbofan engine creatively proposes method for controlling separation boundary layer suction. results show that hub suction reduces...