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  1. Article ; Online: Trajectory Design for Multi-UAV-Aided Wireless Power Transfer toward Future Wireless Systems.

    Mu, Jun / Sun, Zhaojie

    Sensors (Basel, Switzerland)

    2022  Volume 22, Issue 18

    Abstract: In this paper, we investigate an unmanned aerial vehicle (UAV)-assisted wireless power transfer (WPT) system, in which a set of UAV-mounted mobile energy transmitters (ETs) are dispatched to broadcast wireless energy to an energy receiver (ER) on the ... ...

    Abstract In this paper, we investigate an unmanned aerial vehicle (UAV)-assisted wireless power transfer (WPT) system, in which a set of UAV-mounted mobile energy transmitters (ETs) are dispatched to broadcast wireless energy to an energy receiver (ER) on the ground. In particular, we aim to maximize the amount of energy transferred to the ER during a finite UAV's flight period, subject to the UAV's maximum speed and collision avoidance constraints. First, the basic one/two-UAV scenarios are researched in detail, which show that UAVs should hover at fixed locations during the whole charging period. Specifically, the Lagrange multiplier method is employed to solve the proposed optimization problem for the case of two UAV situation. Specifically, the general conclusions based on the theoretical analysis of one/two-UAV scenarios are drawn contribute to deducing the trajectory design of UAVs when the number of UAVs increases from three to seven. The obtained trajectory solution implies that UAVs should be evenly distributed on the circumference with point (0,0,H) as the center and UAVs' safe distance as the radius. Finally, numerical results are provided to validate the trajectory design algorithm for the multiple UAVs-enabled single-user WPT system.
    Language English
    Publishing date 2022-09-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s22186859
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: UAV-Aided Dual-User Wireless Power Transfer: 3D Trajectory Design and Energy Optimization.

    Gou, Xiaogang / Sun, Zhaojie / Huang, Kaiyuan

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 6

    Abstract: Unmanned aerial vehicles (UAVs) have been widely considered to enhance the communication coverage, as well as the wireless power transfer (WPT) of energy-constrained communication networks to prolong their lifetime. However, the trajectory design of a ... ...

    Abstract Unmanned aerial vehicles (UAVs) have been widely considered to enhance the communication coverage, as well as the wireless power transfer (WPT) of energy-constrained communication networks to prolong their lifetime. However, the trajectory design of a UAV in such a system remains a key problem, especially considering the three-dimensional (3D) feature of the UAV. To address this issue, a UAV-assisted dual-user WPT system was investigated in this paper, where a UAV-mounted energy transmitter (ET) flies in the air to broadcast wireless energy to charge the energy receivers (ERs) on the ground. By optimizing the UAV's 3D trajectory toward a balanced tradeoff between energy consumption and WPT performance, the energy harvested by all ERs during a given mission period was maximized. The above goal was achieved through the following detailed designs. On the one hand, on the basis of previous research results, there is a one-to-one correspondence between the UAV's abscissa and height, so only the relationship between the height and time was focused on in this work to obtain the UAV's optimal 3D trajectory. On the other hand, the idea of calculus was employed to calculate the total harvested energy, leading to the proposed high-efficiency trajectory design. Finally, the simulation results demonstrated that this contribution is capable of enhancing the energy supply by carefully designing the 3D trajectory of the UAV, compared to its conventional counterpart. In general, the above-mentioned contribution could be a promising way for UAV-aided WPT in the future Internet of Things (IoT) and wireless sensor networks (WSNs).
    Language English
    Publishing date 2023-03-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23062994
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Effective strategy to fabricate ZIF-8@ZIF-8/polyacrylonitrile nanofibers with high loading efficiency and improved removing of Cr(VI)

    Yang, Xu / Zhou, Yuhong / Sun, Zhaojie / Yang, Chunhui / Tang, Dongyan

    Colloids and surfaces. 2020 Oct. 20, v. 603

    2020  

    Abstract: ZIF-8@ZIF-8/PAN nanofibers were fabricated by the incorporation of zeolitic imidazolate frameworks (ZIFs) with electrospun polyacrylonitrile (PAN) nanofibers, and following by the in-situ growth of ZIFs onto the surface of the nanofibers. The abundant ... ...

    Abstract ZIF-8@ZIF-8/PAN nanofibers were fabricated by the incorporation of zeolitic imidazolate frameworks (ZIFs) with electrospun polyacrylonitrile (PAN) nanofibers, and following by the in-situ growth of ZIFs onto the surface of the nanofibers. The abundant micropores and active sites of ZIFs supplied the effective adsorption and reduction to heavy metal ions of Cr(VI). The obtained novel nanofibers overcome the crystal agglomeration of ZIF-8 effectively and maintained the porous structures by the nanofibrous morphology of PAN and the evenly distributed ZIF-8, and thus exhibited relative higher surface area (871.0 m² g⁻¹) and excellent loading efficiency of ZIF-8 (82.9 %). As target adsorbate, Cr(VI) could be removed from aqueous media effectively with the maximum adsorption capacity (qₘₐₓ) of 39.68 mg g⁻¹, and with better recyclability. Significantly, guided with the proposed feasible adsorption-reduction mechanism of Cr(VI), toxic Cr(VI) ions could be further reduced partially to the relative harmless Cr(III). Potentially, the present stable and advantageous approach to loading and growing metal organic frameworks (MOFs) onto electrospun nanofibers could be extended to other water-stable MOFs and to remove various heavy metal ions.
    Keywords adsorption ; heavy metals ; micropores ; nanofibers ; polyacrylonitrile ; surface area ; toxicity
    Language English
    Dates of publication 2020-1020
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1500517-3
    ISSN 0927-7757
    ISSN 0927-7757
    DOI 10.1016/j.colsurfa.2020.125292
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Polydopamine Microsphere-Incorporated Electrospun Fibers as Novel Adsorbents for Dual-Responsive Adsorption of Methylene Blue.

    Jia, Shuyue / Tang, Dongyan / Zhou, Yuhong / Du, Yunchen / Peng, Jing / Sun, Zhaojie / Yang, Xu

    ACS applied materials & interfaces

    2020  Volume 12, Issue 44, Page(s) 49723–49736

    Abstract: The usually inconvenient detection and uneasy recycling of polydopamine (PDA) with sphere morphology as an adsorbent restrict its actual applications in wastewater purification. Thus, novel composite fibers were fabricated via the electrospinning ... ...

    Abstract The usually inconvenient detection and uneasy recycling of polydopamine (PDA) with sphere morphology as an adsorbent restrict its actual applications in wastewater purification. Thus, novel composite fibers were fabricated via the electrospinning technique by integrating polydopamine microspheres (PDA-MPs) with pH/temperature dual-responsive copolymers. The insoluble fraction of the fabricated composite fibers can be maintained to a value above 89% after being immersed in aqueous solutions with different pH values. Also, the regeneration efficiency of the composite fibers can also remain above 80% after undergoing five adsorption-desorption cycles. These results both indicated that the fabricated composite fibers can avoid secondary pollution during the adsorption process effectively. In addition, the presence of abundant
    Language English
    Publishing date 2020-10-23
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.0c15638
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: β-Cyclodextrin modified electrospinning fibers with good regeneration for efficient temperature-enhanced adsorption of crystal violet.

    Jia, Shuyue / Tang, Dongyan / Peng, Jing / Sun, Zhaojie / Yang, Xu

    Carbohydrate polymers

    2018  Volume 208, Page(s) 486–494

    Abstract: Novel β-cyclodextrin modified fibers with highly insoluble infraction and temperature enhanced adsorption performance were fabricated via electrospinning technology and followed thermo-crosslinking. The fabricated fibers were characterized by FT-IR, ...

    Abstract Novel β-cyclodextrin modified fibers with highly insoluble infraction and temperature enhanced adsorption performance were fabricated via electrospinning technology and followed thermo-crosslinking. The fabricated fibers were characterized by FT-IR,
    Language English
    Publishing date 2018-12-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 1501516-6
    ISSN 1879-1344 ; 0144-8617
    ISSN (online) 1879-1344
    ISSN 0144-8617
    DOI 10.1016/j.carbpol.2018.12.075
    Database MEDical Literature Analysis and Retrieval System OnLINE

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