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Multi‐dimensional force sensing that combines intensity, location, area and the like could gather a wealth of information from mechanical stimuli. Developing materials with force‐induced optical and electrical dual responses would provide unique opportunities to multi‐dimensional force sensing, with electrical signals quantifying the force amplitude and the luminescence output providing spatial distribution of force. However, the reliance on external power supply and high‐energy excitation source brings significant challenges to the applicability of multi‐dimensional force sensors. Here we reported the mechanical energy‐driven and sunlight‐activated materials with force‐induced dual responses, and investigated the underlying mechanisms of self‐sustainable force sensing. Theoretical analysis and experimental data unraveled that trap‐controlled luminescence and interfacial electron transfer play a major role in force‐induced optical and electrical output. These materials were manufactured into pressure sensor with renewable dual‐mode output for quantifying and visualization of pressures by electrical and optical output, respectively, without power supply and high‐energy irradiation. The quantification of tactile sensation and stimuli localization of mice highlighted the multi‐dimensional sensing ability of the sensor. Overall, this self‐powered pressure sensor with multimodal output provides more modalities of force sensing, poised to change the way that intelligent devices sense with the world. [ABSTRACT FROM AUTHOR]

For the problem of low success rate in the communicating operation of CBM horizontal well drilling operations using MWD, the rotating magnetic locating tool, MTS, was developed, which can supply powerful supplement and calibration for MWD measurement within a certain distance. The paper described the technical process and role of the communication. Beginning with the measuring principle of MTS, the measurement errors of the two tools were compared in three aspects: measurement lagging, working style, and error propagation and error ellipsoid. Field examples of the successful application of MTS in the CBM connectivity operations were described. The result can be obtained that different measurement principle and different working way cause different error propagation, thereby lead to the difference on measurement accuracy and communicating job success rate. [ABSTRACT FROM AUTHOR]

In order to investigate the stability of salt caverns in long term operation, three different shapes of salt cavern models were analyzed with respect to the stress distribution of cavern wall and volume change of cavern under various running pressures. The simulation results showed that stress on the wall is at the highest level in the initial operation period of the cavern storage, and stress concentration occurs mainly in parts with higher curvature on the cavity wall. The stress relaxation is also noticeable under fluctuating operation pressure, and the stress in different parts becomes evenly distribution along the cavern wall with stress gradually declining. There is no obvious fluctuation in changing of cavern stress and cavern volume when the operation pressure varies from 4 to 14.5 MPa annually. After a time span of ten years simulation, volumes of pear-shaped cavern, ellipsoid-shaped cavern and cone-shaped cavern reduces 27%, 22% and 37% respectively, and the decrease rate of cavern volume becomes smaller and smaller. [ABSTRACT FROM AUTHOR]

Multi-dimensional force sensing that combines intensity, location, area and the like could gather a wealth of information from mechanical stimuli. Developing materials with force-induced optical and electrical dual responses would provide unique opportunities to multi-dimensional force sensing, with electrical signals quantifying the force amplitude and the luminescence output providing spatial distribution of force. However, the reliance on external power supply and high-energy excitation source brings significant challenges to the applicability of multi-dimensional force sensors. Here we reported the mechanical energy-driven and sunlight-activated materials with force-induced dual responses, and investigated the underlying mechanisms of self-sustainable force sensing. Theoretical analysis and experimental data unraveled that trap-controlled luminescence and interfacial electron transfer play a major role in force-induced optical and electrical output. These materials were manufactured into pressure sensor with renewable dual-mode output for quantifying and visualization of pressures by electrical and optical output, respectively, without power supply and high-energy irradiation. The quantification of tactile sensation and stimuli localization of mice highlighted the multi-dimensional sensing ability of the sensor. Overall, this self-powered pressure sensor with multimodal output provides more modalities of force sensing, poised to change the way that intelligent devices sense with the world., (© 2024 Wiley-VCH GmbH.)

Facet-selective nanostructures in living systems usually exhibit outstanding optical and enzymatic properties, playing important roles in photonics, matter exchange, and biocatalysis. Bioinspired construction of facet-selective nanostructures offers great opportunities for sophisticated nanomaterials, but remains a formidable task. We have developed a macromolecule-mediated strategy for the assembly of upconversion nanoparticles (UCNPs)/two-dimensional metal-organic frameworks (2DMOFs) heterostructures with facet selectivity. Both experimental and theoretical results demonstrate that polyvinylpyrrolidone (PVP) can be utilized as an interface-selective mediator to further promote the facet-selective assembly of MOFs onto the surface of UCNPs. The UCNPs/2DMOFs nanostructures with facet selectivity display specific optical properties and show great advantages in anti-counterfeiting. Our demonstration of UCNPs/2DMOFs provides a vivid example for the controlled fabrication of facet-selective nanostructures and can promote the development of advanced functional materials for applications in biosensing, energy conversion, and information assurance., (© 2021 Wiley-VCH GmbH.)