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  • IOP Publishing  (8)
  • Fan, Xing  (8)
  • 2020-2024  (8)
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  • IOP Publishing  (8)
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  • 2020-2024  (8)
Year
  • 1
    Online Resource
    Online Resource
    CFST arch bridge seismic response analysis considering near-fault ground motion pulse characteristics
    IOP Publishing ; 2020
    In:  IOP Conference Series: Earth and Environmental Science Vol. 567, No. 1 ( 2020-09-01), p. 012041-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 567, No. 1 ( 2020-09-01), p. 012041-
    Abstract: Based on a long-span CFST arch bridge finite element model, nonlinear time-history response analysis is carried out. It is found that the key section of the connection of arch rib and bridge deck is a particular location with larger seismic response. The fling-step type TCU068-E is more liable to excite a greater seismic response at arch rib sections. Through seismic wave dyadic wavelet analysis, the wavelet component in the structure fundamental frequency band is reconstructed to be a new seismic excitation. The results indicate that the low-frequency component of TCU068-E is strong, and larger structural seismic response is generated accordingly.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/567/1/012041
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2434538-6
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  • 2
    Online Resource
    Online Resource
    Research on coating method of thermal conduction silicone grease for spacecraft equipment based on stencil printing
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1633, No. 1 ( 2020-09-01), p. 012027-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1633, No. 1 ( 2020-09-01), p. 012027-
    Abstract: Thermal conduction silicone grease coating is one of the most important methods for passive temperature control of spacecraft equipment. It is difficult to have quantitative control over coating thickness and coating uniformity by manual coating method. This paper introduces the application, coating method and heat transfer mechanism of thermal conduction silicone grease, and proposes a thermal conduction silicone grease coating method for spacecraft equipment based on stencil printing. Also, this paper proves that the method is feasible with pull-off test, thermal vacuum test and thermal conduction test. The test results found that the contact rate of thermal conduction silicone grease with stencil coating is higher than that with manual coating; stencil coating does not cause abnormal overflow of thermal conduction silicone grease; the thermal conduction with stencil coating is nearly the same as that with manual coating.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1633/1/012027
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
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  • 3
    Online Resource
    Online Resource
    Nonlinear evolution of space synthetic electric field in positive DC corona mode transition
    IOP Publishing ; 2023
    In:  Journal of Physics D: Applied Physics Vol. 56, No. 48 ( 2023-11-30), p. 485204-
    Details
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 56, No. 48 ( 2023-11-30), p. 485204-
    Abstract: Positive corona discharge in the air exists under several distinctive forms depending on DC voltage amplitude, including pulses or pulseless glow. Previous studies obtained the current and optical image characteristics of corona discharge through experiments. However, the synthesized electric field characteristics of the different corona modes have not been deeply studied by experiments, and lack of sufficient understanding of the effect of space charges. In this paper, electro-optical modulation technology is used to investigate the characteristics of the space synthetic electric field (SSE) for positive DC corona modes transition. The experimental results show the significant nonlinear evolution characteristics of the SSE and discharge modes transition with the increase of applied voltage. In the pulsed mode, the SSE first changes slowly and then increases sharply. As the applied voltage increases, the discharge mode transition from pulse mode to pulseless glow mode, while the SSE changes slowly. The electric field change rate in the sharp increase is 2–3 times that in the slow change. Dynamic accumulation behavior of space charges is the main reason for the nonlinear evolution of the SSE. When the pulse current starts, the discharge amplitude and frequency are low, and the ions are far away from the ionization region, which has little effect on the migration process of the high field strength region and subsequent ions. With the increase of the applied voltage, the continuous accumulation of positive ions enhances the migration of subsequent positive ions, thereby rapidly increasing the SSE. During the glow discharge mode, the generation and dissipation of space charges are close to dynamic equilibrium, and the fusion of multiple positive ion clouds will increase the SSE.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    URL: Article
    DOI: 10.1088/1361-6463/aced12
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Electric field dependence of SF 6 nonlinear discharge characteristics: N-curve estimations
    IOP Publishing ; 2021
    In:  Plasma Sources Science and Technology Vol. 30, No. 1 ( 2021-01-01), p. 015009-
    Details
    In: Plasma Sources Science and Technology, IOP Publishing, Vol. 30, No. 1 ( 2021-01-01), p. 015009-
    Abstract: The N -curve of SF 6 describes the relationship between the AC breakdown voltage in an extremely inhomogeneous electric field and pressurized SF 6 gas. It is directly dependent on the electric field distribution, which is determined by the gas gap, curvature radius, and background electric field. An increase in gap distance, a decrease in curvature radius, and relatively weak background electric field are all conducive to corona stabilization. The electrode curvature radius is the determining factor in the positive glow corona (PGC) discharge quenching pressure. The breakdown voltage dominated by the streamer mechanism can be estimated accurately by calculating the electric field based on the Deutsch assumption and combining it with the SF 6 static field breakdown criterion. The proposed method is applicable to the estimation of N -curves in gaps with varying field distributions. The work presented in this paper may support further quantitative research on the discharge mechanism of strongly electronegative gas dielectrics.
    Type of Medium: Online Resource
    ISSN: 0963-0252 , 1361-6595
    URL: Article
    DOI: 10.1088/1361-6595/abd2cf
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2004012-X
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  • 5
    Online Resource
    Online Resource
    Fiber-like solar cells
    IOP Publishing ; 2021
    In:  Journal of Semiconductors Vol. 42, No. 5 ( 2021-05-01), p. 050202-
    Details
    In: Journal of Semiconductors, IOP Publishing, Vol. 42, No. 5 ( 2021-05-01), p. 050202-
    Type of Medium: Online Resource
    ISSN: 1674-4926 , 2058-6140
    URL: Article
    DOI: 10.1088/1674-4926/42/5/050202
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2484682-X
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  • 6
    Online Resource
    Online Resource
    Morphological characteristics of streamer region for long air gap positive discharge
    IOP Publishing ; 2021
    In:  Journal of Physics D: Applied Physics Vol. 54, No. 2 ( 2021-01-14), p. 025205-
    Details
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 54, No. 2 ( 2021-01-14), p. 025205-
    Abstract: Knowledge of leader corona is the basis for long spark discharge modelling, which is critical to understand the underlying physics of lightning flashes and dielectric breakdown of long air gap widely utilized in power systems. This paper presents an accurate observation of the leader corona. The morphology of the leader corona region during the discharge was obtained using a high-speed camera and an image-enhanced charge-coupled device camera. Statistical results showed that the morphology of the streamer region varied at different discharge sub-phases. The first corona was a conical region with the average apex angle of 118.91°; the leader corona region behaved as a cone with an average vertex angle of 75.87° during the leader propagation process; the streamer area in the final jump was a combination of a cylinder and a cone with the average vertex angle of 82.61°. Noting that the obtained cone apex angle of the leader corona during the leader propagation phase was significantly smaller than that in photographical reports, and the observation results were related to the selected temporal resolution of the optical image apparatus. The discussion on the effect of the single-frame exposure time on observation results found that the average vertex angle of the conical streamer region gradually decreased with the decrease of the single-frame exposure time, and eventually tended to a stable value of about 75.96°. For comparison purposes, discharge experiments under two gap-distances demonstrated that on the premise of stable leader, the statistical distribution characteristics of the leader corona vertex angle were consistent, indicating the universal applicability to the simulation researches. Finally, it is found that the distortion of the electric field caused by the space charge explained the variation of the streamer area during the discharge process.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    URL: Article
    DOI: 10.1088/1361-6463/abbeb3
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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  • 7
    Online Resource
    Online Resource
    Research on the influence of temperature on the sensing function of Faraday effect optical magnetic field sensor
    IOP Publishing ; 2022
    In:  Measurement Science and Technology Vol. 33, No. 9 ( 2022-09-01), p. 095102-
    Details
    In: Measurement Science and Technology, IOP Publishing, Vol. 33, No. 9 ( 2022-09-01), p. 095102-
    Abstract: The Faraday effect optical magnetic field sensor has broad application prospects in power systems, and the temperature stability of the sensor has always been the focus of research. Existing researches mostly focus on the influence of temperature on the Verdet constant of the magneto-optical material, but there are other temperature factors that are not taken into account, which limits the improvement of the temperature stability of the sensor. In this paper, the effect of magneto-optical crystal (TGG) temperature on the optical rotation coefficient and static operating point of the sensor’s sensing function was studied. It was found that the crystal temperature has a significant effect on the optical rotation coefficient and static operating point in the sensing function. The optical rotation coefficient and static operating point fluctuate periodically with the change of crystal temperature. Through the theoretical analysis of the influence mechanism of temperature, it was found that the interference of multiple reflected light in the magneto-optical crystal has a significant influence on the optical rotation coefficient and static operating point. The mechanism of temperature affecting the sensing function was proposed: temperature affects the phase of reflected light through thermo-optical effect and thermal expansion effect, changes the interference state of reflected light, and then affects the optical rotation coefficient and static operating point. Quantitative calculations were carried out on the influence of temperature using the theoretical model. The calculation results are in good agreement with the experimental data. This article provides a theoretical basis for the optimal design of such sensors.
    Type of Medium: Online Resource
    ISSN: 0957-0233 , 1361-6501
    URL: Article
    DOI: 10.1088/1361-6501/ac737f
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1362523-8
    detail.hit.zdb_id: 1011901-2
    SSG: 11
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    Online Resource
  • 8
    Online Resource
    Online Resource
    Performance for the catalytic CO oxidation over the Mo 0.5 Sn 9 Co 90.5 O 2 catalyst
    IOP Publishing ; 2020
    In:  IOP Conference Series: Earth and Environmental Science Vol. 541, No. 1 ( 2020-07-01), p. 012003-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 541, No. 1 ( 2020-07-01), p. 012003-
    Abstract: In this study, carbon monoxide catalytic oxidant MoSnCoO x was prepared by coprecipitating method to investigate the effect of MoO 3 addition amount on catalyst activity. Meanwhile, the sulfur and water resistance of the catalysts were researched by simulating the industrial conditions of sintering smoke emission. The samples were studied using BET, XRD, SEM and H 2 -TPR techniques. The results revealed that catalyst added with 0.5% MoO 3 had better activity than the original Sn 9 Co 91 O 2 catalyst and its efficiency reached 98.04% at 70 °C. After 21 h reaction with sulfur and water in the flue gas, the catalyst efficiency only decreased to 89.75%. According to the results of characterization, Mo 0.5 Sn 9 Co 90.5 O 2 catalyst could better resist sulfur and water, because the presence of MoO 3 not only reduced the crystallinity of the catalyst, but it also increases the specific surface area and oxidation capacity.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/541/1/012003
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2434538-6
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