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  • IOP Publishing  (13)
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  • IOP Publishing  (13)
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  • 1
    Online Resource
    Online Resource
    Research on the Working Performance of UAV Hybrid Power System Based on Mission Profile
    IOP Publishing ; 2023
    In:  Journal of Physics: Conference Series Vol. 2478, No. 10 ( 2023-06-01), p. 102029-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2478, No. 10 ( 2023-06-01), p. 102029-
    Abstract: Currently, UAVs can be divided into two main types based on the type of power unit, fuel-powered UAVs and electrically powered UAVs. Most drones that are generally smaller and lighter in weight are electrically powered; while larger drones are usually fuel-powered. Both have their advantages and disadvantages, with fuel-powered drones being highly polluting and noisy, while electric drones usually have a shorter range. Fuel-powered UAVs are noisy and polluting, while electrically powered UAVs are usually shorter. The hybrid system combines the advantages of both and reduces pollution while ensuring a longer range. In this paper, an oil-electric hybrid power system for a tilt-rotor UAV is studied, a mathematical model of the hybrid power system is built, and the performance of the hybrid power system is studied and analyzed based on the mission profile. The mission profile of the UAV is determined, and the UAV demand power curve under this mission profile is given. The overall performance of the oil-electric hybrid power system is simulated and calculated. The results show that the oil-electric hybrid power system meets the power demand of the tilt-rotor UAV under the mission profile given in this paper, and can work normally within the full envelope.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2478/10/102029
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2166409-2
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  • 2
    Online Resource
    Online Resource
    Research on power configuration scheme of parallel hybrid oil-electric power system for tilt- rotor UAV
    IOP Publishing ; 2023
    In:  Journal of Physics: Conference Series Vol. 2478, No. 10 ( 2023-06-01), p. 102028-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2478, No. 10 ( 2023-06-01), p. 102028-
    Abstract: The tilt-rotor UAV is a new type of unmanned aerial vehicle that has both the hovering capability of a rotary-wing UAV and the high-speed cruising flight capability of a fixed- wing UAV. Through the tilting system of the UAV, different working states can be switched: during the take-off and landing phases, the rotor axis is perpendicular to the ground, thus realizing aerial hovering, forward and backward flight and side flight. In the cruise flight phase, the rotor axis is perpendicular to the flight direction, thus achieving the flight attitude of a fixed-wing aircraft. The hybrid power system is a composite power system that combines fuel power with electrical power. By applying the oil-electric hybrid power system on the tilt-rotor UAV, it can combine the advantages of long range and long range of fuel power and low noise and pollution of electric power. In this paper, the tilt-rotor UAV parallel oil-electric hybrid power system power configuration scheme is studied. Firstly, the three operating modes of the oil-electric hybrid power system are introduced, including hybrid drive, drive charging and pure oil drive. The power requirements of the tilt-rotor UAV in vertical takeoff and landing, fixed-wing cruise and other flight phases are calculated, and the correspondence between the UAV flight status and the hybrid power system operation mode is established according to the working characteristics of the tilt-rotor UAV and the hybrid power system operation mode. The power configuration method for each flight phase is finally determined, and the process of the overall power configuration realization of the threshold value is described in detail.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2478/10/102028
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2166409-2
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  • 3
    Online Resource
    Online Resource
    Unipolar resistive switching behavior in MoS 2 –polyvinyl alcohol-based memory device
    IOP Publishing ; 2022
    In:  Journal of Physics D: Applied Physics Vol. 55, No. 36 ( 2022-09-08), p. 365108-
    Details
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 55, No. 36 ( 2022-09-08), p. 365108-
    Abstract: MoS 2 –polymer-based memory devices have attracted significant interest owing to their mechanical flexibility, convenient solution processability, and affordability. These devices exhibit bipolar resistive switching behavior, and their switching relies on the polarity of the applied bias. This paper presents a memory device in which a MoS 2 –polyvinyl alcohol (PVA) hybrid film is sandwiched between Ag and Pt electrodes. The developed Ag/MoS 2 –PVA/Pt device manifests typical unipolar resistive switching (URS) behavior and nonvolatile rewritable memory performance with a low operating voltage, large ON/OFF ratio (10 5 ), and multilevel cell storage ability. Notably, 1T-phase MoS 2 is crucial for the URS behavior, and this switching behavior can be ascribed to the charge trapping as well as the Joule-heating-induced de-trapping of the S vacancies associated with 1T MoS 2 . These findings can facilitate the development of new designs for high-performance, high-density data storage.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    URL: Article
    DOI: 10.1088/1361-6463/ac79db
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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  • 4
    Online Resource
    Online Resource
    Facile and scalable fabrication of Ni cantilever nanoprobes using silicon template and micro-electroforming techniques for nano-tip focused electrohydrodynamic jet printing
    IOP Publishing ; 2021
    In:  Nanotechnology Vol. 32, No. 10 ( 2021-03-05), p. 105301-
    Details
    In: Nanotechnology, IOP Publishing, Vol. 32, No. 10 ( 2021-03-05), p. 105301-
    Abstract: Electrohydrodynamic jet (E-Jet) printing is a powerful technique for micro/nanostructure fabrication with high resolution and efficiency. However, conventional E-Jet printing are still limited in printing accuracy and ink adaptability due to the nozzle clogging effect. In this paper, we develop a nano-tip focused electrohydrodynamic jet (NFEJ) method to print high-resolution structures. The Ni cantilever nanoprobes with nanoscale radius of curvature (ROC) on their tips were manufactured by a facile and scalable method using silicon template and micro-electroforming technique. Scanning electron microscope was used to analyse the micromorphology of the silicon template with inverted pyramid pits, which was obtained from anisotropic wet etching of silicon. Electroforming mold was obtained by photolithography and plasma etching which divide the top side of Ni film into isolated cantilever pits. Ni cantilever nanoprobes with an average tip ROC of about 48 nm were achieved by the subsequent micro electroforming process. High-resolution droplets array with an average diameter of about 890 ± 93 nm were printed by the NFEJ printing head equipped with these Ni nanoprobes, which verified the practicality of the developed Ni nanoprobes for NFEJ printing.
    Type of Medium: Online Resource
    ISSN: 0957-4484 , 1361-6528
    URL: Article
    DOI: 10.1088/1361-6528/abccec
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1362365-5
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    Characterization of thermal-resistance in Ga 2 O 3 Schottky barrier diodes with temperature-sensitive electrical parameters
    IOP Publishing ; 2021
    In:  Semiconductor Science and Technology Vol. 36, No. 11 ( 2021-11-01), p. 115010-
    Details
    In: Semiconductor Science and Technology, IOP Publishing, Vol. 36, No. 11 ( 2021-11-01), p. 115010-
    Type of Medium: Online Resource
    ISSN: 0268-1242 , 1361-6641
    URL: Article
    DOI: 10.1088/1361-6641/ac1d23
    RVK:
    UA 7761
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 54647-1
    detail.hit.zdb_id: 1361285-2
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  • 6
    Online Resource
    Online Resource
    Valve-based consecutive bioprinting method for multimaterial tissue-like constructs with controllable interfaces
    IOP Publishing ; 2021
    In:  Biofabrication Vol. 13, No. 3 ( 2021-07-01), p. 035001-
    Details
    In: Biofabrication, IOP Publishing, Vol. 13, No. 3 ( 2021-07-01), p. 035001-
    Abstract: Bioprinting is a promising technology focusing on tissue manufacturing, whose vital problem is the precise assembly of multiple materials. As the primary solution, the extrusion-based multi-printhead bioprinting (MPB) method requires printhead switching during the printing process, which induces inefficient motion time and material interface defects. We present a valve-based consecutive bioprinting (VCB) method to resolve these problems, containing a precise integrated switching printhead and a well-matched voxelated digital model. The rotary valve built-in the VCB printhead guarantees the precise assembling of different materials at the interface isolated from the viscoelastic inks’ elastic potential energy in the cartridge. We study the coordinated control approach of the valve rotation and pressure adjustment to achieve the seamless switching, leading to a controllable multimaterial interface, including boundary and suture structure. Furthermore, we compare the VCB method and MPB method, quantitatively and comprehensively, indicating that the VCB method obtained greater mechanical strength (maximum tensile deformation increased by 44.37%) and higher printing efficiency (effective time ratio increased by 29.48%). As an exemplar, we fabricate a muscle-like tissue with a vascular tree, suture interface encapsulating C2C12, and human dermal fibroblasts (HDFB) cells, then placed it in complete medium with continuous perfusion for 5 d. Our study suggests that the VCB method is sufficient to fabricate heterogeneous tissues with complex multimaterial interfaces.
    Type of Medium: Online Resource
    ISSN: 1758-5082 , 1758-5090
    URL: Article
    DOI: 10.1088/1758-5090/abdb86
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2500944-8
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  • 7
    Online Resource
    Online Resource
    New localized electronic states of soliton in trans-(CH) X
    IOP Publishing ; 1987
    In:  Chinese Physics Letters Vol. 4, No. 8 ( 1987-08), p. 349-352
    Details
    In: Chinese Physics Letters, IOP Publishing, Vol. 4, No. 8 ( 1987-08), p. 349-352
    Type of Medium: Online Resource
    ISSN: 0256-307X , 1741-3540
    URL: Article
    DOI: 10.1088/0256-307X/4/8/004
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1987
    detail.hit.zdb_id: 2040565-0
    SSG: 6,25
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  • 8
    Online Resource
    Online Resource
    Influence of Temperature Control of Coke Oven on Life Cycle of Refractories
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 2076, No. 1 ( 2021-11-01), p. 012089-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2076, No. 1 ( 2021-11-01), p. 012089-
    Abstract: Different stages of the oven drying are analyzed by the theory of molecular diffusion and crystal change in oven drying process. It’s pointed that in order to ensure uniform expansion and gray seam integrity, the speed of spreading to the outside about within water should be in accordance with the speed of evaporation about surface moisture in the drying period, heating up too quickly will easily lead to extending drying period and destroying masonry rigor. The expansion of silica brick is mainly from the volume effect form with the transition between the allotrope in the expansion period, the heating rate of crystal transformation point must be strictly controlled. At the same time, quartz content should be higher, lesser residual quartz content will be better. The hot state engineering period is consistent with the construction schedule, the construction sequence can’t be reversed, and it is not recommended at this stage to extend the construction period. Effective control of the heating rate of the three stages above lays a solid foundation to extend the oven life.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2076/1/012089
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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  • 9
    Online Resource
    Online Resource
    A novel double dielectric barrier discharge reactor with high field emission and secondary electron emission for toluene abatement
    IOP Publishing ; 2022
    In:  Plasma Science and Technology Vol. 24, No. 1 ( 2022-01-01), p. 015504-
    Details
    In: Plasma Science and Technology, IOP Publishing, Vol. 24, No. 1 ( 2022-01-01), p. 015504-
    Abstract: Dielectric barrier discharge (DBD) has been extensively investigated in the fields of environment and energy, whereas its practical implementation is still limited due to its unsatisfactory energy efficiency. In order to improve the energy efficiency of DBD, a novel double dielectric barrier discharge (NDDBD) reactor with high field emission and secondary electron emission was developed and compared with traditional DDBD (TDDBD) configuration. Firstly, the discharge characteristics of the two DDBD reactors were analyzed. Compared to TDDBD, the NDDBD reactor exhibited much stronger discharge intensity, higher transferred charge, dissipated power and gas temperature due to the effective utilization of cathode field emission and secondary electron emission. Subsequently, toluene abatement performance of the two reactors was evaluated. The toluene decomposition efficiency and mineralization rate of NDDBD were much higher than that of TDDBD, which were 86.44%–100% versus 28.17%–80.48% and 17.16%–43.42% versus 7.17%–16.44% at 2.17–15.12 W and 1.24–4.90 W respectively. NDDBD also exhibited higher energy yield than TDDBD, whereas the overall energy constant k overall of the two reactors were similar. Finally, plausible toluene decomposition pathway in TDDBD and NDDBD was suggested based on organic intermediates that generated from toluene degradation. The finding of this study is expected to provide reference for the design and optimization of DBD reactor for volatile organic compounds control and other applications.
    Type of Medium: Online Resource
    ISSN: 1009-0630
    URL: Article
    DOI: 10.1088/2058-6272/ac17e4
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2240796-0
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  • 10
    Online Resource
    Online Resource
    Preparation and Research of Nano Water - Based Ultra - Thin Fire Retardant Coatings for Steel Structure
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 782, No. 2 ( 2020-03-01), p. 022109-
    Details
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 782, No. 2 ( 2020-03-01), p. 022109-
    Abstract: The effects of nanometre materials on fire retardant coatings for steel structure were prepared and studied. The results showed that there were many bubbles in the Nano coating, and the carbon layer was more complete and compact. At the same time, the heat release rate, total heat release and smoke production rate of Nano coatings are all lower than traditional coatings. According to XPS energy spectrum analysis of the Nano coating, the content of O element in the black region is lower, and the content of P element is higher than that in the white region, indicating that the combustion in the black region is not complete and the flame retardant effect is batter.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    URL: Article
    DOI: 10.1088/1757-899X/782/2/022109
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
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