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  • IOP Publishing  (9)
  • 1
    Online Resource
    Online Resource
    Analysis of surrounding rock anchoring effect under the condition of squeezed mountain
    IOP Publishing ; 2021
    In:  IOP Conference Series: Earth and Environmental Science Vol. 669, No. 1 ( 2021-02-01), p. 012028-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 669, No. 1 ( 2021-02-01), p. 012028-
    Abstract: In the process of orogenesis, the geological conditions of vertical strata were formed due to the intense compressive tectonic movement, and lithologic stratification occurred in the rock mass of the plant along the horizontal plane and vertically upstream and downstream. The main powerhouse of a power station straddles two types of rock formations along the axis. Considering the lithological differences between the two ends, traditional support methods will inevitably fail to meet the requirements of safety and economy. In this paper, under the condition of systematic bolt support for the whole plant, prestressed anchor cables are added to the upstream and downstream side walls of the plant in the type III surrounding rock area to increase the stability, and the anchoring effect is analyzed and compared with the calculation of the burrow. The results show that the deformation around the cave in the surrounding rock areas of type II and III under unsupported conditions differs by 31.48%, and the depth of the plastic zone in the surrounding rock area of type III exceeds the anchoring depth of the bolt; After partition support, The horizontal displacements of typical cross-sections in the two types of surrounding rock areas have decreased by 8.66% and 17.11% respectively, the stress distribution is more uniform, the distribution range of the plastic zone in the downstream wall of the plant is significantly reduced, and the stability of the surrounding rock is guaranteed.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/669/1/012028
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2434538-6
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  • 2
    Online Resource
    Online Resource
    Modeling Simulation and Maintenance Strategy Optimization of Multi-component System
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 2068, No. 1 ( 2021-10-01), p. 012032-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2068, No. 1 ( 2021-10-01), p. 012032-
    Abstract: As the system tends to be complicated and refined, the probability and cost of failure also increase. In the actual operation and production, the system will be affected by various factors such as temperature, humidity and other factors to change their original working environment, which will have greater impact on the reliability of the system. Based on the reliability theory, this paper mainly studies the k-out-of-n: F system, constructs the reliability model of the system in dynamic environment, gives the simulation algorithm of the system reliability. Finally, this paper puts forward two maintenance strategies which are optimized to achieve the purpose of minimizing the long-term average cost during system operation.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2068/1/012032
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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  • 3
    Online Resource
    Online Resource
    Particle flow analysis of basalt fiber gabion slope under conditions of rapid drawdown of water level
    IOP Publishing ; 2021
    In:  IOP Conference Series: Earth and Environmental Science Vol. 643, No. 1 ( 2021-01-01), p. 012030-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 643, No. 1 ( 2021-01-01), p. 012030-
    Abstract: As a new green material, basalt fiber has the advantages of high strength and corrosion resistance, and is an ideal material for ecological protection technology. The rapid change of the hydraulic gradient within the slope caused by the sudden drop of river water level is an important factor inducing bank slope instability. Studying the stability of gabion slope protection under this condition is the key to evaluating the effect of gabion support. Taking a basalt fiber gabion slope protection project as an example, this paper carried out the stability study of the gabion slope protection under the condition of sudden drop in water level and compared it with the original slope. The stability was analyzed from the perspectives of deformation and stress, and revealed The deformation mechanism and the beneficial effects of the gabion structure during the instability failure process of the original slope. The results show that under the condition of a sudden drop in river water level, the use of gabion support from the left side of the slope to the slope surface can improve the stability of the slope, and there will be no continuous sliding surface in the slope, and the failure of gabion appears as partial dislocation and separation phenomenon. The research results provide important reference value for river gabion slope protection design and stability evaluation.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/643/1/012030
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2434538-6
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  • 4
    Online Resource
    Online Resource
    Multi-sensor Resource Management and Intelligent Target Tracking Strategy Generation and Evaluation Based on Ant Colony Algorithm
    IOP Publishing ; 2022
    In:  Journal of Physics: Conference Series Vol. 2337, No. 1 ( 2022-09-01), p. 012014-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2337, No. 1 ( 2022-09-01), p. 012014-
    Abstract: This paper studies the multi-sensor resource management and intelligent tracking strategy generation for different targets. Firstly, the multi-sensor resource management methods are analyzed and compared with each other to specify the planning and information theories as the basis for this research. Then, a functional model is established according to the sensor resource updates, target visibility analysis, sensor performance analysis and sensor-to-target assignments. And the multi-sensor intelligent target tracking workflow is designed based on the function model. Thirdly, the corresponding multi-sensor intelligent target tracking strategy generation is designed based on ant colony algorithm. Finally, the evaluation analysis on the strategy generation is completed. This study provides a reference for the future studies on multi-sensor intelligent target tracking and multi-sensor system design.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2337/1/012014
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2166409-2
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  • 5
    Online Resource
    Online Resource
    Influence of injected signal polarization on SBS, SRS, spectral broadening, and self-pulsing properties in high-power fiber amplifier
    IOP Publishing ; 2022
    In:  Laser Physics Letters Vol. 19, No. 8 ( 2022-08-01), p. 085102-
    Details
    In: Laser Physics Letters, IOP Publishing, Vol. 19, No. 8 ( 2022-08-01), p. 085102-
    Abstract: In this paper, we construct a narrow-linewidth amplifier based on polarization-maintaining (PM) fiber, which can be injected by a fiber oscillator seed or white noise signal phase-modulated seed. The stimulated Brillouin scattering (SBS), SRS, spectral broadening, self-pulsing properties of the fiber amplifier when its’ injected signal is 0° or 45° relative to the slow axes of the PM fiber are studied. It is indicated that when the injected signal is launched at 45° relative to the slow axes, the nonlinear effects are significantly suppressed compared with the case of the injected signal is launched parallel to the slow axis. The spectral broadening rate is reduced from 0.14 pm W −1 to 0.0747 pm W −1 , the ratio of Raman to laser peak intensity is increased from 20 dB to 30 dB, the SBS threshold is increased by 〉 24%, and the self-pulsing threshold is increased by 28.7%. It is worth noting that the nonlinear properties corresponding to the injected polarization state in our experiment are quite different from some earlier works.
    Type of Medium: Online Resource
    ISSN: 1612-2011 , 1612-202X
    URL: Article
    DOI: 10.1088/1612-202X/ac7eca
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2131546-2
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  • 6
    Online Resource
    Online Resource
    Effect of target power on the structure and tribological Properties of La-Ti/WS 2 composite films prepared by unbalanced magnetron sputtering
    IOP Publishing ; 2020
    In:  Materials Research Express Vol. 7, No. 3 ( 2020-03-01), p. 036401-
    Details
    In: Materials Research Express, IOP Publishing, Vol. 7, No. 3 ( 2020-03-01), p. 036401-
    Abstract: The properties of Physical Vacuum Deposit (PVD) films could be improved by doping rare earth elements and other metal elements. In this paper, La-Ti/WS 2 composite films were prepared by unbalanced magnetron sputtering. The effect of target power on the structure and properties of La-Ti/WS 2 composite films was studied. Scanning electron microscopy (SEM) and x-ray diffraction (XRD) were used to analyze the micro morphology, composition and crystal structure of the film. The hardness and friction and wear properties of the film were tested by nano-indentation and friction and wear testing machine. The results show that the structure and composition of La-Ti/WS 2 composite films prepared by magnetron sputtering are affected by the target power. With the increase of the target power, the diffraction peak of WS 2 (002) was shifted to the low θ value, the crystal surface spacing was decreased, the crystal lattice shrinked, the porous structure of La-Ti/WS 2 composite films was decreased significantly, the coarse columnar crystal was refined significantly, and the film density was improved effectively. When the target power is 20 W, the sliding surface of La-Ti/WS 2 composite film (002) is parallel to the surface, showing lower friction coefficient and better wear resistance; when the target power is 50 W, La-Ti/WS 2 composite film has higher hardness, higher wear rate and poor wear resistance. The density and friction and wear properties of La-Ti/WS 2 composite films can be improved by suitable La-Ti content.
    Type of Medium: Online Resource
    ISSN: 2053-1591
    URL: Article
    DOI: 10.1088/2053-1591/ab77f2
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2760382-9
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  • 7
    Online Resource
    Online Resource
    Quantum light source devices of In(Ga)As semiconductorself-assembled quantum dots
    IOP Publishing ; 2019
    In:  Journal of Semiconductors Vol. 40, No. 7 ( 2019-07-01), p. 071902-
    Details
    In: Journal of Semiconductors, IOP Publishing, Vol. 40, No. 7 ( 2019-07-01), p. 071902-
    Abstract: A brief introduction of semiconductor self-assembled quantum dots (QDs) applied in single-photon sources is given. Single QDs in confined quantum optical microcavity systems are reviewed along with their optical properties and coupling characteristics. Subsequently, the recent progresses in In(Ga)As QDs systems are summarized including the preparation of quantum light sources, multiple methods for embedding single QDs into different microcavities and the scalability of single-photon emitting wavelength. Particularly, several In(Ga)As QD single-photon devices are surveyed including In(Ga)As QDs coupling with nanowires, InAs QDs coupling with distributed Bragg reflection microcavity and the In(Ga)As QDs coupling with micropillar microcavities. Furthermore, applications in the field of single QDs technology are illustrated, such as the entangled photon emission by spontaneous parametric down conversion, the single-photon quantum storage, the chip preparation of single-photon sources as well as the single-photon resonance-fluorescence measurements.
    Type of Medium: Online Resource
    ISSN: 1674-4926 , 2058-6140
    URL: Article
    DOI: 10.1088/1674-4926/40/7/071902
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2484682-X
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  • 8
    Online Resource
    Online Resource
    3 kW, 0.2 nm narrow linewidth linearly polarized all-fiber laser based on a compact MOPA structure
    IOP Publishing ; 2020
    In:  Laser Physics Letters Vol. 17, No. 7 ( 2020-06-01), p. 075101-
    Details
    In: Laser Physics Letters, IOP Publishing, Vol. 17, No. 7 ( 2020-06-01), p. 075101-
    Type of Medium: Online Resource
    ISSN: 1612-2011 , 1612-202X
    URL: Article
    DOI: 10.1088/1612-202X/ab8e42
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2131546-2
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  • 9
    Online Resource
    Online Resource
    Tunable ultra-broadband polarization filter based on three-core resonance of the fluid-infiltrated and gold-coated photonic crystal fiber
    IOP Publishing ; 2018
    In:  Journal of Physics D: Applied Physics Vol. 51, No. 12 ( 2018-03-28), p. 125101-
    Details
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 51, No. 12 ( 2018-03-28), p. 125101-
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    URL: Article
    DOI: 10.1088/1361-6463/aaac1e
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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