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  • IOP Publishing  (26)
  • 1
    Online Resource
    Online Resource
    Homologous post-treatment strategy enabling phase-pure α-FAPbI 3 films
    IOP Publishing ; 2023
    In:  Nanotechnology Vol. 34, No. 36 ( 2023-09-03), p. 365707-
    Details
    In: Nanotechnology, IOP Publishing, Vol. 34, No. 36 ( 2023-09-03), p. 365707-
    Abstract: Formamidinium lead triiodide (FAPbI 3 ) is considered as the prospective light-absorbing layer on account of the close-to-ideal bandgap of the α -phase, wide optical absorption spectrum and good thermal stability. Therefore, how to realize δ to α -phase transition to obtain phase-pure α -FAPbI 3 without additives is important for FAPbI 3 perovskite films. Herein, a homologous post-treatment strategy (HPTS) without additives is proposed to prepare FAPbI 3 films with pure α -phase. The strategy is processed along with dissolution and reconstruction process during the annealing. The FAPbI 3 film has tensile strain with the substrate, and the lattice keeps tensile, and the film maintains in an α / δ hybrid phase. The HPTS process releases the tensile strain between the lattice and the substrate. The process of strain release realizes the phase transition from δ to α -phase during this process. This strategy can accelerate the transformation from hexagonal δ -FAPbI 3 to cubic α -FAPbI 3 at 120 °C. As a result, the acquired α -FAPbI 3 films exhibit better film quality in optical and electrical properties, accordingly achieving device efficiency of 19.34% and enhanced stability. This work explores an effective approach to obtain additive-free and phase-pure α -FAPbI 3 films through a HPTS to fabricate uniform high-performance α -FAPbI 3 perovskite solar cells.
    Type of Medium: Online Resource
    ISSN: 0957-4484 , 1361-6528
    URL: Article
    DOI: 10.1088/1361-6528/acdd0b
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1362365-5
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    Gelatin methacryloyl and Laponite bioink for 3D bioprinted organotypic tumor modeling
    IOP Publishing ; 2023
    In:  Biofabrication Vol. 15, No. 4 ( 2023-10-01), p. 045005-
    Details
    In: Biofabrication, IOP Publishing, Vol. 15, No. 4 ( 2023-10-01), p. 045005-
    Abstract: Three-dimensional (3D) in vitro tumor models that can capture the pathophysiology of human tumors are essential for cancer biology and drug development. However, simulating the tumor microenvironment is still challenging because it consists of a heterogeneous mixture of various cellular components and biological factors. In this regard, current extracellular matrix (ECM)-mimicking hydrogels used in tumor tissue engineering lack physical interactions that can keep biological factors released by encapsulated cells within the hydrogel and improve paracrine interactions. Here, we developed a nanoengineered ion-covalent cross-linkable bioink to construct 3D bioprinted organotypic tumor models. The bioink was designed to implement the tumor ECM by creating an interpenetrating network composed of gelatin methacryloyl (GelMA), a light cross-linkable polymer, and synthetic nanosilicate (Laponite) that exhibits a unique ionic charge to improve retention of biological factors released by the encapsulated cells and assist in paracrine signals. The physical properties related to printability were evaluated to analyze the effect of Laponite hydrogel on bioink. Low GelMA (5%) with high Laponite (2.5%–3.5%) composite hydrogels and high GelMA (10%) with low Laponite (1.0%–2.0%) composite hydrogels showed acceptable mechanical properties for 3D printing. However, a low GelMA composite hydrogel with a high Laponite content could not provide acceptable cell viability. Fluorescent cell labeling studies showed that as the proportion of Laponite increased, the cells became more aggregated to form larger 3D tumor structures. Reverse transcription-polymerase chain reaction (RT-qPCR) and western blot experiments showed that an increase in the Laponite ratio induces upregulation of growth factor and tissue remodeling-related genes and proteins in tumor cells. In contrast, cell cycle and proliferation-related genes were downregulated. On the other hand, concerning fibroblasts, the increase in the Laponite ratio indicated an overall upregulation of the mesenchymal phenotype-related genes and proteins. Our study may provide a rationale for using Laponite-based hydrogels in 3D cancer modeling.
    Type of Medium: Online Resource
    ISSN: 1758-5082 , 1758-5090
    URL: Article
    DOI: 10.1088/1758-5090/ace0db
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2500944-8
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  • 3
    Online Resource
    Online Resource
    A deep generative model based on CNN-CVAE for wind turbine condition monitoring
    IOP Publishing ; 2023
    In:  Measurement Science and Technology Vol. 34, No. 3 ( 2023-03-01), p. 035902-
    Details
    In: Measurement Science and Technology, IOP Publishing, Vol. 34, No. 3 ( 2023-03-01), p. 035902-
    Abstract: Auto-encoder (AE)-based condition monitoring (CM) methods for fault detection of wind turbines have received considerable attention due to their powerful feature extraction ability. However, traditional AE-based monitoring methods can only learn point-to-point features by minimizing reconstruction errors, which leads to a low sensitivity to anomaly data and weak robustness to noise data. To this end, we introduce a novel deep generative method based on the convolutional neural network (CNN)-conditional variational auto-encoder (CVAE). The key idea of CNN-CVAE is to unify the representation learning capacity of the CVAE and CNN. Specifically, CVAE can learn a probability distribution model by being trained on an anomaly-free supervisory control and data acquisition systems (SCADA) dataset; CNN and deconvolution operations are adopted for better time-series feature extraction and reconstruction performance. A statistical process control chart is applied to determine the alarm threshold. The effectiveness of the CNN-CVAE-based method is validated by datasets collected by SCADA installed in a commercial wind farm in China for impending blade breakage and gearbox failure. Abundant experiments with state-of-the-art deep learning-based CM methods are conducted, which indicate that our proposed method outperforms other methods in robustness, fault detection data sensitivity, fault warning time, and model parameters.
    Type of Medium: Online Resource
    ISSN: 0957-0233 , 1361-6501
    URL: Article
    DOI: 10.1088/1361-6501/aca496
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1362523-8
    detail.hit.zdb_id: 1011901-2
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    Low threshold lasing in Al-decorated GaN microdisk on silicon substrate
    IOP Publishing ; 2023
    In:  Physica Scripta Vol. 98, No. 4 ( 2023-04-01), p. 045012-
    Details
    In: Physica Scripta, IOP Publishing, Vol. 98, No. 4 ( 2023-04-01), p. 045012-
    Abstract: In spite of the unique advantages of nitride microcavities laser, the optical loss and threshed values are still high in most GaN microdisk laser integrated on silicon substrate. Herein, we fabricated a GaN microdisk cavity pivoted on Si substrate using standard semiconductor process. Al nanoparticles (NPs) with diameter below 100 nm were then decorated on the GaN cavity as surface plasmons (SPs) gain to enhance the lasing performance. SPs coupling properties and photoluminescence (PL) enhancement of Al decorated cavities were studied via excitation power-dependent PL and time-resolved PL measurements. Low optical loss caused by device suspension and SPs coupling induced Purcell Factor enhancement significantly improve the lasing properties. A spontaneous enhancement in PL (by 1.75 folds) along with altered lasing characteristics, including accelerated exciton recombination, reduced lasing threshold value (by 5 folds approximately), slight lasing intensity improvement and redshift of the resonant mode, were observed.
    Type of Medium: Online Resource
    ISSN: 0031-8949 , 1402-4896
    URL: Article
    DOI: 10.1088/1402-4896/acbfea
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1477351-X
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  • 5
    Online Resource
    Online Resource
    Advances in bismuth-based topological quantum materials by scanning tunneling microscopy
    IOP Publishing ; 2022
    In:  Materials Futures Vol. 1, No. 3 ( 2022-09-01), p. 032202-
    Details
    In: Materials Futures, IOP Publishing, Vol. 1, No. 3 ( 2022-09-01), p. 032202-
    Abstract: In recent years, topological quantum materials (TQMs) have attracted intensive attention in the area of condensed matter physics due to their novel topologies and their promising applications in quantum computing, spin electronics and next-generation integrated circuits. Scanning tunneling microscopy/spectroscopy (STM/STS) is regarded as a powerful technique to characterize the local density of states with atomic resolution, which is ideally suited to the measurement of the bulk-boundary correspondence of TQMs. In this review, using STM/STS, we focus on recent research on bismuth-based TQMs, including quantum-spin Hall insulators, 3D weak topological insulators (TIs), high-order TIs, topological Dirac semi-metals and dual TIs. Efficient methods for the modulation of the topological properties of the TQMs are introduced, such as interlayer interaction, thickness variation and local electric field perturbation. Finally, the challenges and prospects for this field of study are discussed.
    Type of Medium: Online Resource
    ISSN: 2752-5724
    URL: Article
    DOI: 10.1088/2752-5724/ac84f5
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 3106737-2
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  • 6
    Online Resource
    Online Resource
    Study on the Electrochromic Label for High-voltage Equipment with Wo 3
    IOP Publishing ; 2018
    In:  IOP Conference Series: Earth and Environmental Science Vol. 192 ( 2018-11-05), p. 012024-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 192 ( 2018-11-05), p. 012024-
    Type of Medium: Online Resource
    ISSN: 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/192/1/012024
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2434538-6
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  • 7
    Online Resource
    Online Resource
    Research of Sponge City Landscape Planning Based on Landscape Security Pattern
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 2002, No. 1 ( 2021-08-01), p. 012076-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2002, No. 1 ( 2021-08-01), p. 012076-
    Abstract: With the rapid urbanization and increasing urban impervious areas in China, the construction of the sponge city has gradually turned to the urban ecological space planning. Based on the theory of landscape safety pattern, the construction of sponge city should improve the rainwater management system from multiple scales and enhance the functional of urban landscape space. Firstly, the paper describes the ecological basement elements of the sponge urban landscape safety pattern, as well as the steps and technical methods of sponge urban landscape planning. Secondly, taking Shenfu New City as an example to elaborate the method of sponge urban landscape planning from multiple scales, the landscape ecological planning. The approach is introduced into the theoretical method of sponge city construction, and the feasibility of the study is illustrated by verificationof model, which provides new ideas and methods for sponge urban landscape planning.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2002/1/012076
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2166409-2
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  • 8
    Online Resource
    Online Resource
    Self-organized pattern on the surface of a metal anode in low-pressure DC discharge
    IOP Publishing ; 2018
    In:  Plasma Science and Technology Vol. 20, No. 3 ( 2018-03), p. 035402-
    Details
    In: Plasma Science and Technology, IOP Publishing, Vol. 20, No. 3 ( 2018-03), p. 035402-
    Type of Medium: Online Resource
    ISSN: 1009-0630
    URL: Article
    DOI: 10.1088/2058-6272/aa997f
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2240796-0
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  • 9
    Online Resource
    Online Resource
    Direct band gap and strong Rashba effect in van der Waals heterostructures of InSe and Sb single layers
    IOP Publishing ; 2021
    In:  Journal of Physics: Condensed Matter Vol. 33, No. 15 ( 2021-04-14), p. 155001-
    Details
    In: Journal of Physics: Condensed Matter, IOP Publishing, Vol. 33, No. 15 ( 2021-04-14), p. 155001-
    Abstract: Van der Waals heterostructures formed by stacking different types of 2D materials are attracting increasing attention due to new emergent physical properties such as interlayer excitons. Recently synthesized atomically thin indium selenide (InSe) and antimony (Sb) individually exhibit interesting electronic properties such as high electron mobility in the former and high hole mobility in the latter. In this work, we present a first-principles investigation on the stability and electronic properties of ultrathin bilayer heterostructures composed of InSe and Sb single layers. The calculated electronic band structures reveal a direct band gap semiconducting nature of the InSe/Sb heterostructures independent of stacking pattern. Taking spin–orbit coupling (SOC) into account, we find a large Rashba spin splitting at the bottom of conduction band, which originates from the atomic SOC with the symmetry breaking in the heterostructure. The strength of the Rashba spin splitting can be tuned by applying in-plane biaxial strain or an out-of-plane external electric field. The presence of large Rashba spin splitting together with a suitable band gap in InSe/Sb bilayer heterostructures make them promising candidates for spin field-effect transistor and optoelectronic device applications.
    Type of Medium: Online Resource
    ISSN: 0953-8984 , 1361-648X
    URL: Article
    DOI: 10.1088/1361-648X/abd9ee
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1472968-4
    detail.hit.zdb_id: 228975-1
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  • 10
    Online Resource
    Online Resource
    Decision Analysis of Spent Power Battery Recovery Mode under Hybrid Dual-Channel Collection
    IOP Publishing ; 2021
    In:  IOP Conference Series: Earth and Environmental Science Vol. 647, No. 1 ( 2021-01-01), p. 012094-
    Details
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 647, No. 1 ( 2021-01-01), p. 012094-
    Abstract: Recycling spent power battery is an important measure to alleviate energy shortage and environmental pollution. However, at present, there is no uniform standard for the recycling channels of spent power battery, and the construction of recycling channels of various recycling subjects is chaotic, and the mode with the highest efficiency is still inconclusive. Therefore, based on the current situation of spent power battery recycling, combined with the closed-loop supply chain channel decision-making theory, this paper studies three hybrid dual-channel recycling modes, compares and analyses the recycling rate and profit under different modes, and finally discusses the influence of different factors and recycling modes through numerical analysis. The results show that: (1) The hybrid dual-channel recycling mode of automobile alliance and third-party recycler can bring the maximum recovery rate and profit. (2) The competition between different recycling channels can not only improve the recovery rate, but will lead to the decline of the recovery rate and profit, resulting in a double loss situation. (3) Centralized decision-making brought about by cooperation can improve the total recovery rate and the total channel profit.
    Type of Medium: Online Resource
    ISSN: 1755-1307 , 1755-1315
    URL: Article
    DOI: 10.1088/1755-1315/647/1/012094
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2434538-6
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