Guoquan Qi

China National Petroleum Corporation (China)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Houbu Li

China National Petroleum Corporation (China)

Dongtao Qi

China National Petroleum Corporation (China)

Bin Wei

Quest Diagnostics (United States)

Xuehua Cai

China National Petroleum Corporation (China)

D.T. Qi

Henan University of Science and Technology

Hongxia Yan

Northwestern Polytechnical University

Nan Ding

Inner Mongolia University

Jianfeng Zhu

Shaanxi University of Science and Technology

Haibo Yang

National Engineering Research Center of Electromagnetic Radiation Control Materials

Ning Ding

Qilu University of Technology

Cooperative Institutions

China National Petroleum Corporation (China)

Northwestern Polytechnical University

Chinese Academy of Sciences

Chang'an University

Shaanxi University of Science and Technology

Central South University

Dalian University of Technology

Sun Yat-sen University

Wuhan University of Technology

Guizhou University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Hydrostatic Experimental Study and Failure Mechanism of Glass Fiber Reinforced Thermoplastic Pipes Used for Oilfields

Lecture notes in mechanical engineering (2018)

Guoquan Qi Dongtao Qi Nan Ding Xiaodong Shao

Hydrostatic pressure

Residual strength

Spark plug

10.1007/978-981-13-0107-0_108

Cite

Citations (1)

The structural phase transition and phase stability of TiO₂(P42/nmc) under high pressure from first-principles calculations

Physica Scripta (2015)

Haikuan Dong Ming-Biao Li Guoquan Qi Xiao‐Ming Xiu Shi Libin

TiO2 (P42/nmc) structural phase transition and phase stability are investigated by first principles based on density functional theory. It is observed that the columbite can directly change to a tetragonal P42/nmc structure above 45.8 GPa for GGA and 50.1 GPa for GGA + U. A new TiO2 polymorph with P42/nmc structure is proposed, and its elastic constants and phonon dispersions are discussed. It is seen that P42/nmc structure is mechanically stable above 30 GPa, and satisfies the dynamical stability at 60 GPa. We also analyze the XRD patterns and the equations of state for related TiO2 polymorphs. This paper concludes with a discussion that fluorite and P42/nmc may be coexisting phases, which is in accordance with the cubic TiO2 experimental result.

Columbite

Tetragonal crystal system

Fluorite

Structural Stability

10.1088/0031-8949/91/1/015701

Cite

Citations (1)

Highly Thermal Conductive and Electrically Insulating Epoxy Composites Based on Zinc-Oxide-Coated Silver Nanowires

Polymers (2022)

Li Zhang Wenfeng Zhu Guoquan Qi Houbu Li Dongtao Qi

Nano-ZnO particles were deposited on the surface of silver nanowires (AgNWs) by the precipitation method, and the obtained AgNW@ZnO filler with core-shell structure was added to epoxy resin to prepare AgNW@ZnO/EP thermally conductive composites. The ZnO coating on the surface of AgNWs effectively improves the thermal conductivity of the composites. When 8 wt% AgNW@ZnO filler was added to the epoxy resin, the thermal conductivity of the AgNW@ZnO/EP composite increased to 0.77 W/(m·K). The enhancement of the thermal conductivity is attributed to the fact that ZnO effectively improves the interface bonding between AgNWs and the epoxy matrix, thus strengthening the contact between AgNWs. In addition, the electrical insulation of the AgNW@ZnO/EP composites was improved upon the introduction of the ZnO coating over AgNWs. For the filler content of 8 wt%, the volume resistivity of the AgNW@ZnO/EP composites was found to be higher than 10

Electrically conductive

10.3390/polym14173539

Cite

Citations (6)

Molecular Simulation Study on the Hydrogen Permeation Behavior and Mechanism of Common Polymers

Polymers (2024)

Xuemin Zhang Lizhen Zhai Houbu Li Guoquan Qi Xiong Gao

This research aimed to provide an understanding of the selection and safe application of pipeline liner materials for hydrogen transport by examining the permeation properties and mechanisms of hydrogen within polymers commonly used for this purpose, such as high-density polyethylene (HDPE) and ethylene-vinyl alcohol copolymer (EVOH), through molecular simulation. The study was carried out within defined operational parameters of temperature (ranging from room temperature to 80 °C) and pressure (from 2.5 to 10 MPa) that are pertinent to hydrogen pipeline infrastructures. The results reveal that with an increase in temperature from 30 °C to 80 °C, the solubility, diffusion, and permeability coefficients of hydrogen in HDPE increase by 18.7%, 92.9%, and 129.0%, respectively. Similarly, in EVOH, these coefficients experience increments of 15.9%, 81.6%, and 112.7%. Conversely, pressure variations have a negligible effect on permeability in both polymers. HDPE exhibits significantly higher hydrogen permeability compared to EVOH. The unique chain segment configuration of EVOH leads to the formation of robust hydrogen bonds among the hydroxyl groups, thereby impeding the permeation of hydrogen. The process by which hydrogen is adsorbed in polymers involves aggregation at low potential energy levels. During diffusion, the hydrogen molecule primarily vibrates within a limited range, with intermittent occurrences of significant hole-to-hole transitions over larger distances. Hydrogen exhibits a stronger interaction with HDPE compared to EVOH, leading to a higher number of adsorption sites and increased hydrogen adsorption capacity in HDPE. Hydrogen molecules move more actively in HDPE than in EVOH, exhibiting greater hole amplitude and more holes in transition during the diffusion process.

High-density polyethylene

10.3390/polym16070953

Cite

Citations (2)

The fracture and perforation failure analysis of downhole tubes

Heliyon (2024)

Han Ding H.B. Li Zhiyu Zhang D.T. Qi Guoquan Qi

Perforation

10.1016/j.heliyon.2024.e38896

Cite

Citations (0)

Leakage analysis of steel wire reinforced polyethylene composite pipe used for waste water transportation

Engineering Failure Analysis (2021)

Xuemin Zhang Lin Hou Houbu Li Guoquan Qi Dongtao Qi

Leakage (economics)

Cladding (metalworking)

Pipe

Hydrostatic pressure

10.1016/j.engfailanal.2021.105750

Cite

Citations (8)

Application of college physics teaching based on computer simulation

Guoquan Qi

In college physics teaching, guiding students to use computer simulation is not only a new connotation of computer aided physics teaching, but also a product combined computers with college physics course. From the perspective of the computer simulation technology-assisted teaching college physics and according to cognitive learning theory, constructivist theory, psychological theory and university physics teaching the theory, this paper explains the basis of these theories in computer simulation technology-assisted university physics teaching application, and puts forward its own point of view. In the end, on the basis of examples, the paper conducts the research on computer simulation technology-assisted teaching of physics, showing preponderance of the use of computer simulation methods to solve complex physical problems.

Connotation

Basis (linear algebra)

10.1109/isra.2012.6219261

Cite

Citations (0)

Failure analysis of the adhesive metal joint bonded on anticorrosion plastic alloy composite pipe

Engineering Failure Analysis (2014)

Houbu Li Xuemin Zhang Dongtao Qi Xuehua Cai Nan Ding

Shear Strength

10.1016/j.engfailanal.2014.09.009

Cite

Citations (15)

Analysis of bulge failure of steel wire-reinforced thermoplastic composite pipe

Engineering Failure Analysis (2023)

Han Ding A.B. Zhang H.B. Li D.T. Qi Guoquan Qi

Brittleness

Scratch

Internal pressure

Delamination

10.1016/j.engfailanal.2023.107232

Cite

Citations (4)

The Aging Performance of PVDF in Acid Oil and Gas Medium

Polymers (2022)

Guoquan Qi Hongxia Yan Dongtao Qi Houbu Li Zhao Zhang

In the process of transporting oil and gas, the service performance of thermoplastic pipes will decline due to the multiple influences of medium, temperature, and pressure. In order to study the service performance changes of PVDF pipes under oil and gas transportation conditions, the high-temperature autoclave is used to simulate the service state of the pipe in the mediums. The PVDF samples are exposed to simulated oil and gas mediums for 1 week, 3 weeks, 5 weeks, and 7 weeks under 60 °C and 90 °C conditions. After the exposure test, the physical and chemical properties of the PVDF pipe are tested and compared with the initial samples. Compared with the initial sample, the sample quality after the exposure test has a slight increase, with growth rates of 2% and 3% at 60 °C and 90 °C, respectively. Meanwhile, the tensile strength of the samples is about 13% and 21% lower than that of the initial sample, respectively. According to the microscopic morphology analyses, there are some crack defects on the surface of the sample after the exposure test. Through infrared analysis, it is shown that no molecular chain breakage, crosslinking, or other reactions are found after the exposure test. The above analysis shows that the PVDF sample has slight penetration and swelling during the exposure test. However, due to the large force between the PVDF molecules, its mechanical properties have a small downward trend, showing excellent environmental stress crack resistance.

Breakage

Autoclave

Service life

Penetration (warfare)

Tensile testing

10.3390/polym14194244

Cite

Citations (3)