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  • IOP Publishing  (11)
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  • IOP Publishing  (11)
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  • 1
    Online Resource
    Online Resource
    Influence of surface modification of carbon fiber based on magnetron sputtering technology on mechanical properties of carbon fiber composites
    IOP Publishing ; 2020
    In:  Materials Research Express Vol. 7, No. 10 ( 2020-10-01), p. 105602-
    Details
    In: Materials Research Express, IOP Publishing, Vol. 7, No. 10 ( 2020-10-01), p. 105602-
    Abstract: To improve the interfacial performance of carbon fiber (CF) and epoxy resin, the surface of CF was modified using magnetron sputtering technology, and a CF epoxy resin (CFER) composite was prepared using injection molding technology. The influence of magnetron sputtering technology on the surface properties of CF was investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), and dynamic contact angle analysis (DCAA). The influence of the surface modification of the CFs by magnetron sputtering on the mechanical and interfacial properties of CF composites was analyzed by testing the tensile and bending properties of the CFER composites. The results indicated that the surface morphology of CF can be modified by magnetron sputtering, and a nano sized carbon film was deposited on the surface of the CFs. The morphology of the carbon film on the surface of the CFs was different from that on the silicon pellet. The surface roughness of the CF increased after it was modified by magnetron sputtering. The surface wettability of the CFs may be improved by increasing the surface free energy of the fiber owing to the deposition of the carbon film. Tests of the tensile and bending properties of the CFER composites showed that the surface modification of CFs by magnetron sputtering can effectively improve the mechanical properties of the CFER composites, which not only improves the tensile strength and bending strength, but also increases the tensile modulus and bending modulus. The SEM images showed that the interfacial adhesion between the modified CF and the epoxy resin was significantly improved. The stress–strain curves showed that the failure mode of the CFER composite modified by magnetron sputtering CF surface changed, and a stress yield phenomenon was observed.
    Type of Medium: Online Resource
    ISSN: 2053-1591
    URL: Article
    DOI: 10.1088/2053-1591/abbc90
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2760382-9
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Multi-target Programming Method for Active Distribution Network Considering the Multiple Collaborative Interaction Effect
    IOP Publishing ; 2022
    In:  Journal of Physics: Conference Series Vol. 2360, No. 1 ( 2022-11-01), p. 012028-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2360, No. 1 ( 2022-11-01), p. 012028-
    Abstract: The effect of indeterminacy of distributed generation should be fully considered in the planning of active distribution network. Based on the conventional load forecasting, the trusted output model of distributed generation connected to active distribution network is built. Thinking the influence of load demand side response on the forecasted load results, a distribution network load forecasting model considering the multiple synergistic interaction effect of source, load and storage is proposed. Based on the results of load forecasting, a double-deck multi-objective programming model of active distribution network is established. The upper deck function is the problem of power grid optimization planning, and the goal is to minimize the annual network comprehensive cost; The lower level programming model determines the active power output of manageable resources such as energy stored based on the typical daily system operation economy under the grid achieved by the upper part planning. Through the optimization solution, the distribution network planning scheme and the location and capacity scheme of energy storage under the active management mode are obtained. In result, we use an active distribution network in Shanghai to prove the scientificity and effectiveness of the proposed programming method
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2360/1/012028
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2166409-2
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Research on anti-pilot contamination in massive MIMO
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 1983, No. 1 ( 2021-07-01), p. 012046-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1983, No. 1 ( 2021-07-01), p. 012046-
    Abstract: In order for the pre-coding technology to suppress the influence of pilot contamination, a hybrid pre-coding scheme is proposed in this paper by combining a full-digital pre-coding technology and an analog beamforming in the context of current massive MIMO. Simulation results show that the proposed pre-coding scheme effectively suppresses the pilot contamination while reducing the system structure complexity and ensuring the system’s basic performance, which is of important significance in practical communication applications.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1983/1/012046
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Design and Verification Test of the Primary and Secondary Stage Compression Gap Size of Miniature High Pressure Air Compressor
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 1802, No. 2 ( 2021-03-01), p. 022080-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1802, No. 2 ( 2021-03-01), p. 022080-
    Abstract: Aiming at the prominent problem of the primary and secondary pistons hitting the cylinder head in the current miniature high-pressure three-stage air compressor, a design study on the size of the primary and secondary compression gap is carried out. Through the theoretical force analysis of the connecting rod, the force situation of the connecting rod at the top and bottom dead centers is obtained. The three-dimensional models of connecting rod and cylinder are established based on SolidWorks software, and the three-dimensional models are simplified. Based on Ansys Workbench software, the connecting rod and cylinder models are pre-processed, model discretized and post-processed. The structural statics and steady-state thermal comprehensive analysis of the connecting rod at the upper and lower dead points and the steady-state thermal analysis of the cylinder under working conditions are completed. Through analysis, the total axial deformation of the connecting rod and the total axial deformation of the cylinder under high temperature and high speed working conditions are obtained. According to the simulation analysis results, the first and second compression gap size is designed. Based on the design results, ten sets of air compressors are tested for dimensional design verification. The test results show that the air compressors of each test group can complete the charging requirements within the specified time, and there is no phenomenon of piston hitting the cylinder head, indicating the size design reliability.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1802/2/022080
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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    Online Resource
  • 5
    Online Resource
    Online Resource
    A multi-directional and multi-modal galloping piezoelectric energy harvester with tri-section beam
    IOP Publishing ; 2024
    In:  Smart Materials and Structures Vol. 33, No. 3 ( 2024-03-01), p. 035045-
    Details
    In: Smart Materials and Structures, IOP Publishing, Vol. 33, No. 3 ( 2024-03-01), p. 035045-
    Abstract: A traditional wind energy harvester based on galloping can only harvest wind energy from one specific direction, which fails to work efficiently in a natural erratic environment. In this study, we propose a galloping-based piezoelectric energy harvester that can collect energy from wind flow in a wide range of incident directions with multiple vibrational modes being excited. The proposed harvester is composed of a tri-section beam with bonded piezoelectric transducers and a square bluff body with splitters. Finite element analysis of the tri-section beam structure is first performed and confirms the clustered natural frequencies that ease the excitation of different modes. Then, the aerodynamic characteristics of various bluff bodies is conducted through computational fluid dynamics to compare the capability of galloping. Finally, the wind tunnel experiment is carried out to test the wind energy harvesting performance by utilizing the harvester’s multi-modal characteristics. The results of this study demonstrate that the proposed harvester can harvest wind energy in multiple directions with the capability of galloping in multiple vibrational modes, and superior performance is achieved when the second bending mode is triggered. The novel design of the harvester from this work provides a viable solution for harvesting wind energy in a natural environment with varying wind conditions.
    Type of Medium: Online Resource
    ISSN: 0964-1726 , 1361-665X
    URL: Article
    DOI: 10.1088/1361-665X/ad287e
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2024
    detail.hit.zdb_id: 1115038-5
    detail.hit.zdb_id: 2002821-0
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  • 6
    Online Resource
    Online Resource
    Growth and characterization of halogen substitution in counter benzenesulfonate of organic nonlinear optical crystal : DASB
    IOP Publishing ; 2020
    In:  Materials Research Express Vol. 7, No. 7 ( 2020-07-01), p. 075102-
    Details
    In: Materials Research Express, IOP Publishing, Vol. 7, No. 7 ( 2020-07-01), p. 075102-
    Abstract: The organic stilbazolium derivative crystal4-dimethylamino-N′-methyl-4′- stilbazolium p- bromobenzenesulfonate (DASB) was successfully grown by spontaneous nucleation method coupled slow evaporation (SNM-SE) for the first time. The corresponding powder XRD revealed the crystalline nature of the DASB material, and various functional groups were determined by FT-IR. The thermal stability and melting point were analyzed by TG/DTG and DSC measurement. The absorption coefficient, band gap energy, cut-off wavelength and extinction coefficient were obtained through UV–vis-NIR spectral study. Photoluminescence result indicates DASB crystal exists purple emission at 405 nm and 467 nm because of the π – π * and defect transitions, respectively. The SHG efficiency of DASB crystal is about 3 times higher than KDP crystal. All the encouraging results indicate the DASB crystal is a promising candidate for the Thz generation applications.
    Type of Medium: Online Resource
    ISSN: 2053-1591
    URL: Article
    DOI: 10.1088/2053-1591/ab6b5d
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2760382-9
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Polypyrrole-hemin-reduce graphene oxide: rapid synthesis and enhanced electrocatalytic activity towards the reduction of hydrogen peroxide
    IOP Publishing ; 2014
    In:  Materials Research Express Vol. 1, No. 4 ( 2014-10-29), p. 045601-
    Details
    In: Materials Research Express, IOP Publishing, Vol. 1, No. 4 ( 2014-10-29), p. 045601-
    Type of Medium: Online Resource
    ISSN: 2053-1591
    URL: Article
    DOI: 10.1088/2053-1591/1/4/045601
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 2760382-9
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  • 8
    Online Resource
    Online Resource
    Electron spin coherence and effect of spin polarization on electron relaxation dynamics in GaAs
    IOP Publishing ; 2011
    In:  Semiconductor Science and Technology Vol. 26, No. 9 ( 2011-09-01), p. 095012-
    Details
    In: Semiconductor Science and Technology, IOP Publishing, Vol. 26, No. 9 ( 2011-09-01), p. 095012-
    Type of Medium: Online Resource
    ISSN: 0268-1242 , 1361-6641
    URL: Article
    DOI: 10.1088/0268-1242/26/9/095012
    RVK:
    UA 7761
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 54647-1
    detail.hit.zdb_id: 1361285-2
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  • 9
    Online Resource
    Online Resource
    Double-deck programming method for areal energy optimal allocation in active distribution network
    IOP Publishing ; 2022
    In:  Journal of Physics: Conference Series Vol. 2360, No. 1 ( 2022-11-01), p. 012029-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2360, No. 1 ( 2022-11-01), p. 012029-
    Abstract: With the problem of worldwide energy and environment become more and more serious, the method that increasing power sources and the investment of substation construction is difficult to meet the rapidly growing power demand. From the theory of comprehensive resource strategic planning and the perspective of the whole society, consider the generalized power supply such as the photovoltaic power supply and interruptible load, establish double-deck programming model for areal energy optimal allocation in active distribution network. The upper planning takes the construction of generalized power supply and the minimizing the total cost of power generation and pollution control as target, improve installed volumn of various power supplies; The lower target is minimizing the net loss, and select address and determine capacitance for generalized power supply. In result, this paper use simplex method and improving PSO algorithm to calculate it. The result of a 33 bus system’s simulation say that the method has the more obvious effect of energy conserving and emissions reducing than the traditional method.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2360/1/012029
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2166409-2
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  • 10
    Online Resource
    Online Resource
    Efficient oxygen evolution reaction on RuO 2 nanoparticles decorated onion-like carbon (OLC)
    IOP Publishing ; 2022
    In:  Nanotechnology Vol. 33, No. 13 ( 2022-03-26), p. 135710-
    Details
    In: Nanotechnology, IOP Publishing, Vol. 33, No. 13 ( 2022-03-26), p. 135710-
    Abstract: Oxygen evolution reaction (OER) is an important half-cell reaction of the electrical water splitting, for its high overpotential associated with sluggish OER kinetics. Therefore, it is critical to develop highly active and durable electrocatalysts to reduce the overpotential. Herein, ultra-small RuO 2 nanoparticles (NPs) supported on onion-like carbon (OLC) and carbon nanotube (CNT) are successfully synthesized by means of wet impregnation combined with annealing treatment, respectively. The microstructure characterization results showed OLC perfect graphitic carbon layer structure, and the RuO 2 NPs supported on the OLC possess larger particle size compared with the RuO 2 NPs supported on the CNT. Moreover, the electronic structure of Ru in RuO 2 /OLC was also optimized by the OLC support to be beneficial for the OER. The OER performance of the catalysts were investigated in 1 M KOH solution. The results show RuO 2 /OLC has a comparable OER activity to the commercial RuO 2 , but a significantly higher mass activity than the commercial RuO 2 . When compared with the RuO 2 /CNT, RuO 2 /OLC not only exhibits lower overpotential and Tafel slop, but also owns more active sites and higher TOF value, indicating the OLC support improved the OER activity of RuO 2 /OLC. Moreover, RuO 2 /OLC showed a superior stability compared with RuO 2 /CNT, which can be attributed to the excellent electrochemical oxidation-resistance of the OLC.
    Type of Medium: Online Resource
    ISSN: 0957-4484 , 1361-6528
    URL: Article
    DOI: 10.1088/1361-6528/ac44e9
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1362365-5
    SSG: 11
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